摘要：
Arabica coffee, as one of the world's three native coffee species, requires rational planning for its growing areas to ensure ecological and sustainable agricultural development. This study aims to establish a decision-making framework using Geographic Information Systems (GIS) and Multi-Criteria Decision-Making (MCDM), with a focus on assessing the habitat suitability of Arabica coffee in Yunnan Province, China. The impacts of climate, topography, soil, and socio-economic factors were considered by selecting 13 criteria through correlation analysis. Indicator weights were determined using the Best-Worst Method (BWM), while weighted processing was conducted using the Base-Criterion Method (BCM). Sensitivity analysis was performed to verify the accuracy and stability of the model. Additionally, several decision models were evaluated to investigate regionalizing Arabica coffee habitats in Yunnan. The results highlighted that minimum temperature during the coldest month is crucial for evaluation purposes. The BWM-GIS model identified suitable areas comprising 13.55% of the total area as most suitable, 27.46% as suitable, and 59.00% as unsuitable, whereas corresponding values for the BCM-GIS model were 9.97%, 30.43%, and 59.59%. Despite employing different decision-making methods, both models yielded similar and consistent results. The suitable areas mainly encompass Dehong, Pu'er, Lincang, Xishuangbanna, Baoshan, southern Chuxiong, eastern Honghe, southern Yuxi, and parts of Wenshan. BWM-GIS achieved an area under curve (AUC) value of 0.891, while BCM-GIS obtained an AUC value of 0.890, indicating the stability and reliability of the models. Among them, the evaluation process of BCM-GIS was simpler and more realistic. Therefore, it has high feasibility and practical value in practical application. The findings from this study provide a significant scientific foundation for optimizing Yunnan Province.
通讯机构：
[Peng, H ] W;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.
关键词：
Magnetic chitosan microspheres;Coking wastewater;Regeneration;Adsorption
摘要：
As a new type of polymer functional material, magnetic chitosan has been widely used in wastewater treatment. In this study, magnetic chitosan microspheres (MCMs) were prepared by reversed-phase microemulsion cross-linking technology, and the adsorption capacity of MCMs to organic pollutants with high chemical oxygen demand (COD) in coking wastewater was studied. Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), brunauer - emmett - teller (BET), vibrating sample magnetometer (VSM) were characterized. The effects of Fe 3 O 4 magnetic nanoparticles (MNPs), pH and the amount of adsorbent on the adsorption properties of MCMs were investigated. The following conclusions are obtained: the MCMs prepared in this study are successfully encapsulated, and the MCMs have good magnetic properties; Meanwhile, the removal performance of COD is higher. When the addition amount of Fe 3 O 4 is 10 % of the mass fraction of chitosan, the maximum adsorption amount of COD by MCMs can reach 261.82 mg/g under the conditions of pH 7.5, reaction temperature 298 K and adsorption time 42 h. The adsorption kinetics can be described by a quasi-second-order kinetic model. In addition, after 4 times of adsorption-desorption processes, the adsorbent still has more than 40 % COD adsorption, and has good adsorption performance. In general, because of the high adsorption efficiency, strong regeneration and excellent magnetic separation performance, MCMs have practical application potential in sewage treatment, biomedicine and other fields.
As a new type of polymer functional material, magnetic chitosan has been widely used in wastewater treatment. In this study, magnetic chitosan microspheres (MCMs) were prepared by reversed-phase microemulsion cross-linking technology, and the adsorption capacity of MCMs to organic pollutants with high chemical oxygen demand (COD) in coking wastewater was studied. Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), brunauer - emmett - teller (BET), vibrating sample magnetometer (VSM) were characterized. The effects of Fe 3 O 4 magnetic nanoparticles (MNPs), pH and the amount of adsorbent on the adsorption properties of MCMs were investigated. The following conclusions are obtained: the MCMs prepared in this study are successfully encapsulated, and the MCMs have good magnetic properties; Meanwhile, the removal performance of COD is higher. When the addition amount of Fe 3 O 4 is 10 % of the mass fraction of chitosan, the maximum adsorption amount of COD by MCMs can reach 261.82 mg/g under the conditions of pH 7.5, reaction temperature 298 K and adsorption time 42 h. The adsorption kinetics can be described by a quasi-second-order kinetic model. In addition, after 4 times of adsorption-desorption processes, the adsorbent still has more than 40 % COD adsorption, and has good adsorption performance. In general, because of the high adsorption efficiency, strong regeneration and excellent magnetic separation performance, MCMs have practical application potential in sewage treatment, biomedicine and other fields.
作者机构：
[Jiayue Lao; Wanwan Fu; Jintao Ma; Ning Xia; Zhili Zhao; Jiesheng Liu; Hao Peng; Tao Fang] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023 China
通讯机构：
[Wanwan Fu] S;School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023 China
摘要：
It is highly feasible to utilize phase change energy storage technology to construct a phase change material (PCM)-based thermal management system for electronic devices. In this paper, stearic acid (SA) was used as the PCM, and expanded graphite (EG) was chosen as the carrier to prepare SA/EG CPCM. The results showed that EG could prevent the melted SA from leaking, and the combination between SA and EG was only physical. When the mass fraction of EG was 11%, the SA/EG CPCM had good shape stability with a phase change temperature ( T m ) of 67.2 °C, a phase change enthalpy (∆ H m ) of 204.4 J/g, and a significantly increased in thermal conductivity (6.432 W/(m·K)). In addition, simulation test experiments showed that the peak value of the heating surface was weakened by about 20 °C in the heating stage after loading the CPCM on the electronic device. Therefore, the resultant SA/EG CPCM in this work had great application value.
关键词：
High alumina fly ash;Mechanical milling;Grinding kinetics;Microstructure;Activation mechanism
摘要：
Mechanical force can significantly enhance the physical and chemical activity of high-alumina fly ash (HAFA). Microparticle fly ash (MFA) was produced through mechanical ball milling of HAFA. The study concentrated on the particle size distribution of MFA after ball milling for 30–90 min and examined the impact of triethanolamine as a grinding aid. The particle size distribution (PSD), grinding kinetics, and mechanisms of microstructure evolution were analyzed. To verify the chemical activity of MFA, a high-alumina fly ash-based environmental material (EMFA) was synthesized. The results indicated that the particle proportion of 1–10 μm in MFA exceeded 50 %, and the RRB function was more suitable for describing the grinding kinetics of MFA. The mineral structure exhibited an increase in the content of amorphous substances, leading to the formation of amorphous active aluminum (Al). The microstructure of MFA displayed a combination of gel-like and fiber-like structures, including large smooth areas and fragment stacking. However, after 90 min of ball milling, a dense pore structure formed. The addition of triethanolamine accelerated the fragmentation of large particles and the formation of a secondary aggregate structure, with D50 remaining stable between 5.424 and 5.736 μm. The maximum compressive strength of EMFA reached 22.34 MPa, meeting the MU20 level of the Chinese standard "Solid Concrete Brick" (GB/T 21144-2023). This study provides crucial theoretical support for the modification, activation, and resource utilization of HAFA.
Mechanical force can significantly enhance the physical and chemical activity of high-alumina fly ash (HAFA). Microparticle fly ash (MFA) was produced through mechanical ball milling of HAFA. The study concentrated on the particle size distribution of MFA after ball milling for 30–90 min and examined the impact of triethanolamine as a grinding aid. The particle size distribution (PSD), grinding kinetics, and mechanisms of microstructure evolution were analyzed. To verify the chemical activity of MFA, a high-alumina fly ash-based environmental material (EMFA) was synthesized. The results indicated that the particle proportion of 1–10 μm in MFA exceeded 50 %, and the RRB function was more suitable for describing the grinding kinetics of MFA. The mineral structure exhibited an increase in the content of amorphous substances, leading to the formation of amorphous active aluminum (Al). The microstructure of MFA displayed a combination of gel-like and fiber-like structures, including large smooth areas and fragment stacking. However, after 90 min of ball milling, a dense pore structure formed. The addition of triethanolamine accelerated the fragmentation of large particles and the formation of a secondary aggregate structure, with D50 remaining stable between 5.424 and 5.736 μm. The maximum compressive strength of EMFA reached 22.34 MPa, meeting the MU20 level of the Chinese standard "Solid Concrete Brick" (GB/T 21144-2023). This study provides crucial theoretical support for the modification, activation, and resource utilization of HAFA.
关键词：
Phase change microcapsules;Methyl palmitate;Polyurea;Thermal energy storage;Interfacial polymerization
摘要：
In this study, a methyl palmitate-polyurea phase change microcapsule (MPCM) was successfully synthesized by interfacial polymerization with methyl palmitate with high latent heat as the core material and tolylene-2,4-diisocyanate (TDI) and diethylene triamine (DETA) as the shell monomers. The effects of emulsifier type and content, cosolvent, reaction rate and core-shell mass ratio on the phase change properties of microcapsules were systematically discussed, and the optimum process was determined. A series of characterization techniques were used to analyze the composition, crystal structure, morphology, microstructure, particle size distribution and thermal performances of the microcapsules. The experimental results presented that the microcapsules synthesized under the optimal conditions had outstanding encapsulation efficiency (72.42 %) and encapsulation rate (70.77 %) with melting temperature and solidification temperature of 27.2 °C and 13.8 °C, and melting enthalpy and solidification enthalpy of 160.5J/g and 157.3J/g, respectively. Moreover, the resulting microcapsules had regularly spherical morphology with compact and smooth surface, and uniform particle size distribution with average particle size of 909.94 nm. Meanwhile, the microcapsules possessed excellent thermal stability, low thermal conductivity (0.2932 W K −1 m −1 ) and excellent thermal reliability. These characteristics made methyl palmitate-polyurea MPCMs have a broad application prospect in the field of thermal insulation.
In this study, a methyl palmitate-polyurea phase change microcapsule (MPCM) was successfully synthesized by interfacial polymerization with methyl palmitate with high latent heat as the core material and tolylene-2,4-diisocyanate (TDI) and diethylene triamine (DETA) as the shell monomers. The effects of emulsifier type and content, cosolvent, reaction rate and core-shell mass ratio on the phase change properties of microcapsules were systematically discussed, and the optimum process was determined. A series of characterization techniques were used to analyze the composition, crystal structure, morphology, microstructure, particle size distribution and thermal performances of the microcapsules. The experimental results presented that the microcapsules synthesized under the optimal conditions had outstanding encapsulation efficiency (72.42 %) and encapsulation rate (70.77 %) with melting temperature and solidification temperature of 27.2 °C and 13.8 °C, and melting enthalpy and solidification enthalpy of 160.5J/g and 157.3J/g, respectively. Moreover, the resulting microcapsules had regularly spherical morphology with compact and smooth surface, and uniform particle size distribution with average particle size of 909.94 nm. Meanwhile, the microcapsules possessed excellent thermal stability, low thermal conductivity (0.2932 W K −1 m −1 ) and excellent thermal reliability. These characteristics made methyl palmitate-polyurea MPCMs have a broad application prospect in the field of thermal insulation.
摘要：
In recent years, the employment of rejuvenators and warm mix asphalt (WMA) additives for reclaimed asphalt pavement (RAP) has been recognized as a popular approach to increase the recycling rate of waste materials and promote the sustainable development of pavement engineering. However, the composition of warm mix recycled asphalt binder is complicated, and the microstructural changes brought about by the rejuvenators and WMA additives are critical in determining its macroscopic mechanical properties. This research focuses on the atomic modeling of the rejuvenators and WMA additives diffusion behavior of the warm mix recycled asphalt binder. The objective is to reveal the thermodynamic performance and diffusion mechanism of the WMA binder under the dual presence of rejuvenators and WMA additives. Three types of mutual diffusion systems (Aged and oil + virgin + wax, Aged + virgin + wax, and Aged and oil + virgin) were established, respectively, for a comparative investigation of the glass transition temperature, viscosity, thermodynamics, free volume, and diffusion behavior. The results indicate a 44.27% and 31.33% decrease in the glass transition temperature and apparent viscosity, respectively, after the incorporation of 5% oil rejuvenators in the Aged + virgin + wax asphalt binder, demonstrating the improved cracking resistance and construction workability. The presence of the RAP binder and organic WMA additives raised the cohesion of the asphalt binder and decreased self-healing ability and free volume, and these detrimental influences can be offset by the introduction of rejuvenators. The combined use of rejuvenators and organic WMA additives remarkably enhanced the de-agglomeration to asphaltenes, stimulated the activity of aged RAP macromolecular components, and ultimately improved the blending efficiency of virgin binders with the overall structure of RAP binders.
通讯机构：
[Xu, Y ] W;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.
摘要：
The surfaces of underwater ship hulls and aquaculture equipment, such as fish cages, are highly susceptible to damage from fouling organisms. Although traditional marine antifouling coatings exhibit effective antifouling properties, the leaching of antifouling agents into the marine environment can lead to pollution and ecological disruption. In this study, we prepared castor oil polyurethane (CO-PU) by reacting castor oil with isocyanate. We then incorporated self-synthesized acrylamide-based quaternary ammonium salts (QASs), specifically dimethyloctylaminopropyl methacrylamide-ammonium QD-BC and its polymer PQDBCAM, into the CO-PU resin to develop CO-PU marine antifouling coatings. By optimizing the formulation to enhance the cross-linking degree of the coating, we obtained coatings with improved mechanical properties and antifouling performance. The results indicate that, in comparison to the pure CO-PU coating, the hydrophilicity of the coating is enhanced, the flexibility is superior, the pencil hardness increases from 5H to 6H, and the adhesion of the PQDBCAM antifouling coating reaches a maximum of 4.79 MPa. All of the coatings demonstrated effectiveness in inhibiting the growth of Pseudomonas aeruginosa, diatoms, and protein attachment, and the increase of QASs leads to enhanced effects. This suggests that acrylamide QAS marine antifouling coatings have a certain degree of antifouling performance, and polymer-based quaternary ammonium PQDBCAM antifouling coatings show superior efficacy. After the 3.6% PQDBCAM coating was statically placed in diatoms for 7 days, the coverage area of diatoms was merely approximately 22.3% and the protein adsorption amount on the surface of the antifouling coating was 31.72 μg/cm(2). The coating could maintain its integrity after 3 months and still exhibit excellent antibacterial effects. The antifouling effect was more durable, effectively reducing the maintenance times of ships and the cleaning frequency of aquaculture equipment.
摘要：
In this paper, the effects of the phosphogypsum (PG) content at 0%–50% and the calcination at 750°C, 800°C, and 850°C on the properties of cement mortar were studied. It is observed that the optimal mechanical properties of cement mortar are achieved when the PG content is 30% and calcined at a temperature of 800°C. Building upon these findings, further investigations were conducted to explore the effect of 0%–5% quicklime aging treatment combined with calcination on the properties of cement mortar. The results show that the samples prepared with PG aging with 2% lime and calcined at 800°C exhibit the best mechanical properties. In addition, it is revealed that the mechanical strength shows similar trends compared to the activation index for PG cement mortar. Physical properties tests and microstructure observation indicate that combining calcination with quicklime modification represents an effective approach to the use of PG in the field of building materials.
In this paper, the effects of the phosphogypsum (PG) content at 0%–50% and the calcination at 750°C, 800°C, and 850°C on the properties of cement mortar were studied. It is observed that the optimal mechanical properties of cement mortar are achieved when the PG content is 30% and calcined at a temperature of 800°C. Building upon these findings, further investigations were conducted to explore the effect of 0%–5% quicklime aging treatment combined with calcination on the properties of cement mortar. The results show that the samples prepared with PG aging with 2% lime and calcined at 800°C exhibit the best mechanical properties. In addition, it is revealed that the mechanical strength shows similar trends compared to the activation index for PG cement mortar. Physical properties tests and microstructure observation indicate that combining calcination with quicklime modification represents an effective approach to the use of PG in the field of building materials.
摘要：
This study investigates the utilization of municipal solid waste incineration (MSWI) fly ash (MFA) to produce non-sintered artificial aggregates (AAs) through alkali activation. To enhance its suitability, MFA underwent a six-month natural carbonation process to remove leachable salts and stabilize heavy metals, during which significant phase transformations were observed. The AAs were fabricated using ternary alkali-activated materials (AAMs) with varying MFA proportions through spray pelletization. Although higher MFA content reduced the strength of the AAs, this effect was counterbalanced by increasing the silicate modulus in the activators. The resulting AAs demonstrated mechanical strength comparable to or exceeding that of natural granite aggregates and recycled aggregates derived from concrete demolition waste. Furthermore, the study examined the reaction products and microstructural characteristics of the AAs. Leachate analysis confirmed compliance with environmental standards for heavy metal content, highlighting the potential of these AAs as a sustainable alternative aggregate resource for the construction industry.
This study investigates the utilization of municipal solid waste incineration (MSWI) fly ash (MFA) to produce non-sintered artificial aggregates (AAs) through alkali activation. To enhance its suitability, MFA underwent a six-month natural carbonation process to remove leachable salts and stabilize heavy metals, during which significant phase transformations were observed. The AAs were fabricated using ternary alkali-activated materials (AAMs) with varying MFA proportions through spray pelletization. Although higher MFA content reduced the strength of the AAs, this effect was counterbalanced by increasing the silicate modulus in the activators. The resulting AAs demonstrated mechanical strength comparable to or exceeding that of natural granite aggregates and recycled aggregates derived from concrete demolition waste. Furthermore, the study examined the reaction products and microstructural characteristics of the AAs. Leachate analysis confirmed compliance with environmental standards for heavy metal content, highlighting the potential of these AAs as a sustainable alternative aggregate resource for the construction industry.
期刊：
Bulletin of Engineering Geology and the Environment,2025年84(4):1-16 ISSN：1435-9529
通讯作者：
Yuxi Ma
作者机构：
[Hao Xu; Yuxi Ma] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, China;[Jiangping Liu] School of Geophysics and Geomatics, China University of Geosciences, Wuhan, China;[Xuan Xiong] Wuhan Maritime Communication Research Institute, Wuhan, China;[Yuquan Zong] Central Southern China Electric Power Design Institute Co., Ltd. Of China Power Engineering Consulting Group, Wuhan, China
通讯机构：
[Yuxi Ma] S;School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, China
摘要：
Leakage is a prevalent latent hazard in earth-rock dams. Accurate detection of the location and severity of leakage areas can provide the basis for treating leakage and reducing the damage to the dam. The key to detecting leakage using seismic wave methods is mastering the response characteristics of leakage reflection wavefields and accurately identifying them from the acquired seismic data. In this study, the dam models with different water content leakage areas are established using discrete random modeling method, based on the soil-rock mixture characteristics of the actual dam media. The effects of water content changes on the leakage reflected wavefields are elaborated, and the seismic attributes that can effectively identify leakage wavefields are summarized. Scattering caused by the heterogeneity of the earth-rock dam reduces the energy of leakage reflected waves and complicates the identification of the leakage wavefields. The characteristics of leakage converted waves, primarily low-frequency signals, are more advantageous for identifying leakage wavefields. With the decrease of water content in the leakage area, the energy of converted waves gradually weakens, and the continuity of the phase axis deteriorates. Wavelet transform can enhance the continuity of the leakage reflected phase axis and effectively suppress random noise interference. The combined use of instantaneous frequency and wavelet transform frequency slice allows for more accurate identification of leakage-reflected wavefields.
摘要：
Geopolymers are coating materials with excellent properties that have received considerable attention due to their high resistance to weathering, chemical attack, abrasion, and adhesion. This paper further investigates the performance of geopolymer-based coatings by examining the effect of varying percentages of zinc oxide on their antimicrobial and durability properties. The performance of the coatings was evaluated following durability tests with the incorporation of different zinc oxide doping levels. Furthermore, to demonstrate the degree of antibacterial properties of the coating, test plates were treated with two common fungi and bacteria, and the number of bacterial colonies was observed. Results showed good stability and antimicrobial properties when coating with ZnO.
期刊：
Journal of Environmental Management,2025年376:124577 ISSN：0301-4797
通讯作者：
Mengjie Qu
作者机构：
[Cheng, Xuan; Mei, Yunjun; Liu, Xingyu] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, China;[Qu, Mengjie] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, China. Electronic address: qumengjie2020@163.com;[Hu, Yang] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, China
通讯机构：
[Mengjie Qu] S;School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
摘要：
The widespread availability of glyphosate in shallow lakes is of significant concern. Glyphosate is an organophosphorus pesticide that can affect the phosphorus cycle and microbial communities in lakes. However, the effects of glyphosate on lakes in different geographical locations remain unclear. This study not only investigated glyphosate and aminomethylphosphonic acid (AMPA) residues in sediments from rural and urban lakes, but also examined differences in the effects of these substances on lake microbial communities and phosphorus cycles. Glyphosate and AMPA were detected in 100% of sediments from the three rural and three urban lakes surveyed. Glyphosate concentrations were not significantly different among all lake sediments; however, AMPA concentrations were significantly higher in rural lake sediments than in urban lake sediments ( P < 0.05). The abundance of the glpC gene, encoding an organophosphorus-degrading enzyme, and the abundance of Luteitalea sp. TBR-22, which is enriched for the glpC gene, were significantly different between rural and urban lake sediments ( P < 0.05). Notably, the abundance of glpC and Luteitalea sp. TBR-22 was significantly and positively correlated with AMPA concentration ( P < 0.05). In addition, the AMPA concentration was significantly and positively correlated with the O-bonded inorganic phosphate (Pi) content ( P < 0.05). These results suggest that high AMPA concentrations in rural lake sediments may increase the production of O-bonded Pi in lake sediments by controlling the expression of glpC in Luteitalea sp. TBR-22, leading to higher concentrations of O-bonded Pi in the rural lake sediments than in the urban lake sediments.
The widespread availability of glyphosate in shallow lakes is of significant concern. Glyphosate is an organophosphorus pesticide that can affect the phosphorus cycle and microbial communities in lakes. However, the effects of glyphosate on lakes in different geographical locations remain unclear. This study not only investigated glyphosate and aminomethylphosphonic acid (AMPA) residues in sediments from rural and urban lakes, but also examined differences in the effects of these substances on lake microbial communities and phosphorus cycles. Glyphosate and AMPA were detected in 100% of sediments from the three rural and three urban lakes surveyed. Glyphosate concentrations were not significantly different among all lake sediments; however, AMPA concentrations were significantly higher in rural lake sediments than in urban lake sediments ( P < 0.05). The abundance of the glpC gene, encoding an organophosphorus-degrading enzyme, and the abundance of Luteitalea sp. TBR-22, which is enriched for the glpC gene, were significantly different between rural and urban lake sediments ( P < 0.05). Notably, the abundance of glpC and Luteitalea sp. TBR-22 was significantly and positively correlated with AMPA concentration ( P < 0.05). In addition, the AMPA concentration was significantly and positively correlated with the O-bonded inorganic phosphate (Pi) content ( P < 0.05). These results suggest that high AMPA concentrations in rural lake sediments may increase the production of O-bonded Pi in lake sediments by controlling the expression of glpC in Luteitalea sp. TBR-22, leading to higher concentrations of O-bonded Pi in the rural lake sediments than in the urban lake sediments.
关键词：
Anammox;Biochar;Fe3+;Nitrogen removal performance;Global warming potential;Microbial community
摘要：
Anammox is a new type of autotrophic nitrogen removal technology with high efficiency and low consumption. However, the long start-up time and poor running stability of Anammox seriously restrict its large-scale application. In this study, simultaneously addition strategy of Fe 3+ and reed straw biochar was developed to improve the nitrogen removal performance of Anammox. The nitrogen removal was highest in Anammox system with simultaneously addition of Fe 3+ and reed straw biochar prepared at 600 °C for 2 h. And continuous addition of Fe 3+ in the Anammox system with reed straw biochar not only exhibit high nitrogen removal efficiency and excellent resistance to nitrogen shock loading, but also had low global warming potential (GWP). Genus Candidatus Brocadia as dominant AnAOB had the highest relative abundance with the simultaneously addition of Fe 3+ and reed straw biochar. Besides, enrichment of iron oxidation–reduction microorganisms through enhancing extracellular electron transfer with reed straw biochar achieved the coupling of Anammox, Feammox and NDFO, which was significantly facilitated the nitrogen removal performance of Anammox.
Anammox is a new type of autotrophic nitrogen removal technology with high efficiency and low consumption. However, the long start-up time and poor running stability of Anammox seriously restrict its large-scale application. In this study, simultaneously addition strategy of Fe 3+ and reed straw biochar was developed to improve the nitrogen removal performance of Anammox. The nitrogen removal was highest in Anammox system with simultaneously addition of Fe 3+ and reed straw biochar prepared at 600 °C for 2 h. And continuous addition of Fe 3+ in the Anammox system with reed straw biochar not only exhibit high nitrogen removal efficiency and excellent resistance to nitrogen shock loading, but also had low global warming potential (GWP). Genus Candidatus Brocadia as dominant AnAOB had the highest relative abundance with the simultaneously addition of Fe 3+ and reed straw biochar. Besides, enrichment of iron oxidation–reduction microorganisms through enhancing extracellular electron transfer with reed straw biochar achieved the coupling of Anammox, Feammox and NDFO, which was significantly facilitated the nitrogen removal performance of Anammox.
关键词：
Municipal solid waste;Co-pretreatment;Resource recycle;Biogas
摘要：
This study proposed a novel pretreatment technology by combining thermal hydrolysis (TH) with calcium hypochlorite (CH) to promote sludge anaerobic digestion (AD) performance. Experimental results indicated that the optimum pretreatment condition was TH at 70 °C combined with 0.08 g/g volatile suspended solids (VSS) of CH, by which the methane production of 260.1 mL/g VSS was achieved, 59.1 % higher than control group. Kinetic analysis revealed that methane production potential enhanced from 158.9 to 257.0 mL/g VSS after TH + CH pretreatment, and methane production rate accordingly increased from 13.10 to 27.97 mL/g VSS/d. Mechanism analysis illustrated that both extracellular polymeric substances and microbial cells were damaged by TH + CH method, resulting in substantial increase of hydrolysis efficiency. Microbial analysis revealed that the abundances of hydrolytic, acidogenic and methanogenic microbes were all enhanced under co-treatment condition, with the total abundances calculated to be 12.33 % and 22.68 % in control and TH + CH pretreated reactors, respectively.
This study proposed a novel pretreatment technology by combining thermal hydrolysis (TH) with calcium hypochlorite (CH) to promote sludge anaerobic digestion (AD) performance. Experimental results indicated that the optimum pretreatment condition was TH at 70 °C combined with 0.08 g/g volatile suspended solids (VSS) of CH, by which the methane production of 260.1 mL/g VSS was achieved, 59.1 % higher than control group. Kinetic analysis revealed that methane production potential enhanced from 158.9 to 257.0 mL/g VSS after TH + CH pretreatment, and methane production rate accordingly increased from 13.10 to 27.97 mL/g VSS/d. Mechanism analysis illustrated that both extracellular polymeric substances and microbial cells were damaged by TH + CH method, resulting in substantial increase of hydrolysis efficiency. Microbial analysis revealed that the abundances of hydrolytic, acidogenic and methanogenic microbes were all enhanced under co-treatment condition, with the total abundances calculated to be 12.33 % and 22.68 % in control and TH + CH pretreated reactors, respectively.
通讯机构：
[Yu, P ] H;Huazhong Univ Sci & Technol, Sch Civil & Hydraul Engn, Wuhan 430074, Hubei, Peoples R China.
关键词：
Asphalt mixture;Interfacial transition zone;Acid and alkaline water environments;Water stability;Microscopic erosion mechanism
摘要：
Acidity and alkalinity of water environments have been proven to influence the water stability of asphalt mixture. However, the relevant influencing mechanism still remains unclear. To fulfill this research gap, this study conducted a series of microscopic tests, aiming at unveiling the microscopic erosion mechanism of the water environment on the water stability of asphalt mixture for better moisture stability achieved. Specifically, the asphalt-aggregate interfacial transition zone (ITZ) samples were prepared by combining #70 asphalt with limestone and granite, respectively, which were then immersed in water solutions at 3 different pH levels (pH = 3.0, 7.0, and 11.0) for 7 days. The chemical composition and microstructure of the asphalt film on the surface of the ITZ samples pre and post-treatment were scrutinized using the Fourier Transform Infrared Spectroscopy (FTIR) and the Atomic Force Microscope (AFM), while the development of microcracks at the asphalt-aggregate interface were identified and traced utilizing the Scanning Electron Microscope (SEM). The test results indicate that after treatment with acidic and alkaline aqueous solutions, the asphalt film's surface is enriched with polar components such as asphaltenes, resins, and aromatic fractions. The migration of these polar components to the surface of the asphalt film reduces the adhesion between asphalt-aggregate, leading to the formation of microcracks at the asphalt-aggregate interface. The most severe crack development occurs in alkaline water environment, followed by acidic water environment. It is interestingly noted that the adhesion at the asphalt-granite interface is improved under the acidic environment. This improvement may be attributed to the covalent nature of silica, which hinders the adsorption of ions from acidic solution into the asphalt film. This hindrance effectively prevents water intrusion at the asphalt-aggregate interface, thereby reducing the adhesion loss. These findings can help elucidate the mechanism of water damage in asphalt pavement exposed to real-world conditions and enhance its water stability with effective countermeasures proposed.
Acidity and alkalinity of water environments have been proven to influence the water stability of asphalt mixture. However, the relevant influencing mechanism still remains unclear. To fulfill this research gap, this study conducted a series of microscopic tests, aiming at unveiling the microscopic erosion mechanism of the water environment on the water stability of asphalt mixture for better moisture stability achieved. Specifically, the asphalt-aggregate interfacial transition zone (ITZ) samples were prepared by combining #70 asphalt with limestone and granite, respectively, which were then immersed in water solutions at 3 different pH levels (pH = 3.0, 7.0, and 11.0) for 7 days. The chemical composition and microstructure of the asphalt film on the surface of the ITZ samples pre and post-treatment were scrutinized using the Fourier Transform Infrared Spectroscopy (FTIR) and the Atomic Force Microscope (AFM), while the development of microcracks at the asphalt-aggregate interface were identified and traced utilizing the Scanning Electron Microscope (SEM). The test results indicate that after treatment with acidic and alkaline aqueous solutions, the asphalt film's surface is enriched with polar components such as asphaltenes, resins, and aromatic fractions. The migration of these polar components to the surface of the asphalt film reduces the adhesion between asphalt-aggregate, leading to the formation of microcracks at the asphalt-aggregate interface. The most severe crack development occurs in alkaline water environment, followed by acidic water environment. It is interestingly noted that the adhesion at the asphalt-granite interface is improved under the acidic environment. This improvement may be attributed to the covalent nature of silica, which hinders the adsorption of ions from acidic solution into the asphalt film. This hindrance effectively prevents water intrusion at the asphalt-aggregate interface, thereby reducing the adhesion loss. These findings can help elucidate the mechanism of water damage in asphalt pavement exposed to real-world conditions and enhance its water stability with effective countermeasures proposed.
摘要：
Landfills necessitate a liner barrier system to prevent the leakage of contaminants into the surrounding soil. However, the currently employed compacted clay liner (CCL) is insufficient to prevent the leakage of heavy metal ions. This study proposes a novel landfill liner system utilizing sludge-based activated carbon (SAC)-modified clay. The adsorption characteristics of SAC-modified clay liner (SAC-CCL) for Cd(II) or Cu(II) were evaluated through batch tests. The permeability coefficient and unconfined compressive strength of SAC-CCL were assessed through permeation and unconfined compression tests. The permeability coefficient of the SAC-modified clay ranged from 2.57 x 10(-9) to 1.10 x 10(-8) cm/s. The unconfined compressive strength of the SAC-CCL varied between 288 and 531 kPa. The migration of Cd(II) or Cu(II) within an 80 cm thick, full-scale SAC-CCL was simulated using soil column tests. The diffusion coefficient (D) was calculated by inversion using the one-dimensional solute migration equation. The diffusion coefficients (D) for Cd(II) and Cu(II) ranged from 1.9 x 10(-10) to 13.5 x 10(-10) m(2)/s. The retardant performance of SAC-CCL for Cd(II) and Cu(II) followed the order: 3% SAC-CCL > 1% SAC-CCL > CCL > 5% SAC-CCL, from strongest to weakest. Consequently, SAC-modified clay demonstrates significant potential as a landfill lining material. However, the migration behavior of heavy metal ions in SAC-CCLs under cyclic dry-wet conditions requires further investigation.
摘要：
Enzyme-induced carbonate precipitation (EICP) is a promising technique for soil reinforcement. To select a suitable calcium source and a suitable solution amount for aeolian sand stabilization using EICP, specimens treated with different solution amounts (1.5, 2, 2.5, 3, and 3.5 L/m 2 ). Surface strength , crust thickness, calcium carbonate content (CCC) and water vapor adsorption tests were performed to evaluate the effect of two calcium sources (calcium acetate and calcium chloride) on aeolian sand solidification. The plant suitability of solidified sand was investigated by the sea buckthorn growth test. The suitable calcium source was then used for the laboratory wind tunnel test and the field test to examine the erosion resistance of solidified sand. The results demonstrated that Ca(CH 3 COO) 2 -treated specimens exhibited higher strength than CaCl 2 -treated specimens at the same EICP solution amount, and the water vapor equilibrium adsorption mass of Ca(CH 3 COO) 2 -treated specimens was less, indicating that Ca(CH 3 COO) 2 -solidified sand was more effective and had better long-term stability. In addition, plants grown in Ca(CH 3 COO) 2 -treated sand had greater seedling emergence percentage and higher average height, which indicated that calcium acetate is a more suitable calcium source for EICP treatment. Furthermore, the surface strength and crust thickness of solidified sand increased with increasing the solution amount. For sand treated with 3 L/m 2 of solution, the excessive strength and thickness of the crust made plants growth difficult, and the performance of sand treated with more than 2 L/m 2 of solution significantly improved. Thus, the solution amount of 2–3 L/m 2 is suggested for engineering applications . The sand solidified using EICP in the field could effectively mitigate wind erosion and facilitate the growth of native plants. Therefore, EICP can be combined with vegetative method to achieve long-term wind erosion control in the future.
Enzyme-induced carbonate precipitation (EICP) is a promising technique for soil reinforcement. To select a suitable calcium source and a suitable solution amount for aeolian sand stabilization using EICP, specimens treated with different solution amounts (1.5, 2, 2.5, 3, and 3.5 L/m 2 ). Surface strength , crust thickness, calcium carbonate content (CCC) and water vapor adsorption tests were performed to evaluate the effect of two calcium sources (calcium acetate and calcium chloride) on aeolian sand solidification. The plant suitability of solidified sand was investigated by the sea buckthorn growth test. The suitable calcium source was then used for the laboratory wind tunnel test and the field test to examine the erosion resistance of solidified sand. The results demonstrated that Ca(CH 3 COO) 2 -treated specimens exhibited higher strength than CaCl 2 -treated specimens at the same EICP solution amount, and the water vapor equilibrium adsorption mass of Ca(CH 3 COO) 2 -treated specimens was less, indicating that Ca(CH 3 COO) 2 -solidified sand was more effective and had better long-term stability. In addition, plants grown in Ca(CH 3 COO) 2 -treated sand had greater seedling emergence percentage and higher average height, which indicated that calcium acetate is a more suitable calcium source for EICP treatment. Furthermore, the surface strength and crust thickness of solidified sand increased with increasing the solution amount. For sand treated with 3 L/m 2 of solution, the excessive strength and thickness of the crust made plants growth difficult, and the performance of sand treated with more than 2 L/m 2 of solution significantly improved. Thus, the solution amount of 2–3 L/m 2 is suggested for engineering applications . The sand solidified using EICP in the field could effectively mitigate wind erosion and facilitate the growth of native plants. Therefore, EICP can be combined with vegetative method to achieve long-term wind erosion control in the future.
作者机构：
[Ma, Haoqin; Li, Guodong; Li, Changlong; Liu, Tianle; Huang, Xiege; Duan, Bo; Zhai, Pengcheng] Wuhan Univ Technol, Hubei Key Lab Theory & Applicat Adv Mat Mech, Wuhan 430070, Peoples R China.;[Li, Jialiang] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.;[Li, Guodong; Zhai, Pengcheng] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China.
通讯机构：
[Li, GD ; Duan, B] W;Wuhan Univ Technol, Hubei Key Lab Theory & Applicat Adv Mat Mech, Wuhan 430070, Peoples R China.;Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China.
摘要：
Band convergence is considered to be a strategy with clear benefits for thermoelectric performance, generally favoring the co-optimization of conductivity and Seebeck coefficients, and the conventional means include elemental filling to regulate the band. However, the influence of the most electronegative fluorine on the CoSb3 band remains unclear. We carry out density-functional-theory calculations and show that the valence band maximum gradually shifts downward with the increase of fluorine filling, lastly the valence band maximum converges to the highly degenerated secondary valence bands in fluorine-filled skutterudites. The effective degeneracy near the secondary valence band promotes more valleys to participate in electric transport, leading to a carrier mobility of more than the threefold and nearly twofold effective mass for F0.1Co4Sb12 compared to Co4Sb12. This work provides a new and promising route to boost the thermoelectric properties of p-type skutterudites.
