In this work, we used a hybrid system composed of a Microbial Desalination <span style="font-family:Verdana;">Cell (MDC). This system allows, at the same time, the treatment of </span><span st...In this work, we used a hybrid system composed of a Microbial Desalination <span style="font-family:Verdana;">Cell (MDC). This system allows, at the same time, the treatment of </span><span style="font-family:Verdana;">wastewater and the production of electrical energy for the desalination of saltwater. </span><span style="font-family:Verdana;">MDC is a cleaning technology used to purify wastewater. This process has</span><span style="font-family:Verdana;"> been driven by converting organic compounds contained in wastewater into electrical </span><span style="font-family:Verdana;">energy through biological, chemical, and electrochemical processes. The</span><span style="font-family:Verdana;"> produced electrical energy was used to desalinate the saline water. The objective of this work is the desalination or pre-desalination of seawater. For this, </span><span style="font-family:Verdana;">we </span><span style="font-family:Verdana;">have established a theoretical model consisting of differential equations de</span><span style="font-family:Verdana;">scrib</span><span style="font-family:Verdana;">ing the behavior of this system. Subsequently, we developed a program on</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">MAT-</span><span style="font-family:Verdana;">LAB software to simulate and optimized the operation of this system</span><span style="font-family:Verdana;"> and to promote the production of electrical energy in order to improve the desalination efficiency of the MDC. The theoretical re</span><span style="font-family:Verdana;">sult shows that the electrical current production is maximal when the methanogenic growth rate</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">equal to zero</span><span style="font-family:Verdana;">, increases with the increasing of influent substrate concentration and the efficiency of desalination increased with flow rate of saline water.</span>展开更多
Microbial desalination cell （MDC） is a promis- ing technology to desalinate water and generate electrical power simultaneously. The objectives of this study were to investigate the desalination performance of monova...Microbial desalination cell （MDC） is a promis- ing technology to desalinate water and generate electrical power simultaneously. The objectives of this study were to investigate the desalination performance of monovalent and divalent cations in the MDC, and discuss the effect of ion characteristics, ion concentrations, and electrical characteristics. Mixed salt solutions of NaC1, MgC12, KC1, and CaC12 with the same concentration were used in the desalination chamber to study removal of cations. Results showed that in the mixed salt solutions, the electrodialysis desalination rates of cations were： Ca2＋ 〉 Mg2＋ 〉 Na＋ 〉 K＋. Higher ionic charges and smaller hydrated ionic radii resulted in higher desalination rates of the cations, in which the ionic charge was more important than the hydrated ionic radius. Mixed solutions of NaC1 and MgC12 with different concentrations were used in the desalination chamber to study the effect of ion concentra- tions. Results showed that when ion concentrations ofNa＋ were one-fifth to five times of Mg2~, ion concentration influenced the dialysis more profoundly than electrodia- lysis. With the current densities below a certain value, charge transfer efficiencies became very low and the dialysis was the main process responsible for the desalination. And the phosphate transfer from the anode chamber and potassium transfer from the cathode chamber could balance 1%-3% of the charge transfer in the MDC.展开更多
The combination of the microbial electrolysis desalination and chemical-production cell(MEDCC)and Fenton process for the pesticide wastewater treatment was investigate in this study.Real wastewater with several toxic ...The combination of the microbial electrolysis desalination and chemical-production cell(MEDCC)and Fenton process for the pesticide wastewater treatment was investigate in this study.Real wastewater with several toxic pesticides,1633 mg/L COD,and 200 in chromaticity was used for the investigation.Results showed that desalination in the desalination chamber of MEDCC reached 78%.Organics with low molecular weights in the desalination chamber could be removed from the desalination chamber,resulting in 28%and 23%of the total COD in the acid-production and cathode chambers,respectively.The desalination in the desalination chamber and organic transfer contributed to removal of pesticides(e.g.,triadimefon),which could not be removed with other methods,and of the organics with low molecular weights.The COD in the effluent of the MEDCC combined the Fenton process was much lower than that in the perixo-coagulaiton process(<150 vs.555 mg/L).The combined method consumed much less energy and acid for the pH adjustment than that the Fenton.展开更多
以氮掺杂石墨烯(NG)催化微生物燃料电池(MFCs)的阴极,同时多级串并联方式连接MFCs与流动电极电容去离子(FCDI)装置,用以处理含盐废水。结果表明,NG-MFCs的产电脱氮性能明显提升,其最大输出电压为523 m V,NH_4^+-N的去除率达到92.7%;并...以氮掺杂石墨烯(NG)催化微生物燃料电池(MFCs)的阴极,同时多级串并联方式连接MFCs与流动电极电容去离子(FCDI)装置,用以处理含盐废水。结果表明,NG-MFCs的产电脱氮性能明显提升,其最大输出电压为523 m V,NH_4^+-N的去除率达到92.7%;并联方式下的MFCs产电输出更加稳定,处理Na Cl质量浓度2 g/L的盐溶液,MFCs-FCDI装置的除盐率达到30%。因此,NG-MFCs以其输出能量FCDI进行除盐,可达到能源利用与污水处理的双重效果。展开更多
文摘In this work, we used a hybrid system composed of a Microbial Desalination <span style="font-family:Verdana;">Cell (MDC). This system allows, at the same time, the treatment of </span><span style="font-family:Verdana;">wastewater and the production of electrical energy for the desalination of saltwater. </span><span style="font-family:Verdana;">MDC is a cleaning technology used to purify wastewater. This process has</span><span style="font-family:Verdana;"> been driven by converting organic compounds contained in wastewater into electrical </span><span style="font-family:Verdana;">energy through biological, chemical, and electrochemical processes. The</span><span style="font-family:Verdana;"> produced electrical energy was used to desalinate the saline water. The objective of this work is the desalination or pre-desalination of seawater. For this, </span><span style="font-family:Verdana;">we </span><span style="font-family:Verdana;">have established a theoretical model consisting of differential equations de</span><span style="font-family:Verdana;">scrib</span><span style="font-family:Verdana;">ing the behavior of this system. Subsequently, we developed a program on</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">MAT-</span><span style="font-family:Verdana;">LAB software to simulate and optimized the operation of this system</span><span style="font-family:Verdana;"> and to promote the production of electrical energy in order to improve the desalination efficiency of the MDC. The theoretical re</span><span style="font-family:Verdana;">sult shows that the electrical current production is maximal when the methanogenic growth rate</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">equal to zero</span><span style="font-family:Verdana;">, increases with the increasing of influent substrate concentration and the efficiency of desalination increased with flow rate of saline water.</span>
基金Acknowledgements This work was partly supported by grants from the State Key Joint Laboratory of Environment Simulation and Pollution Control （10K04ESPCT）, the National Natural Science Foundation of China （Grant Nos. 51039007 and 51278500）, the program of Guangzhou Science ＆ Technology Department （No. 2012J4300115）, National Key Scientific Instrument and Equipment Development Project （No. 2012YQ0301110 803）, the Fundamental Research Funds for the Central Universities （131gpy55） and the innovative doctorial program of Sun Yat-sen University.
文摘Microbial desalination cell （MDC） is a promis- ing technology to desalinate water and generate electrical power simultaneously. The objectives of this study were to investigate the desalination performance of monovalent and divalent cations in the MDC, and discuss the effect of ion characteristics, ion concentrations, and electrical characteristics. Mixed salt solutions of NaC1, MgC12, KC1, and CaC12 with the same concentration were used in the desalination chamber to study removal of cations. Results showed that in the mixed salt solutions, the electrodialysis desalination rates of cations were： Ca2＋ 〉 Mg2＋ 〉 Na＋ 〉 K＋. Higher ionic charges and smaller hydrated ionic radii resulted in higher desalination rates of the cations, in which the ionic charge was more important than the hydrated ionic radius. Mixed solutions of NaC1 and MgC12 with different concentrations were used in the desalination chamber to study the effect of ion concentra- tions. Results showed that when ion concentrations ofNa＋ were one-fifth to five times of Mg2~, ion concentration influenced the dialysis more profoundly than electrodia- lysis. With the current densities below a certain value, charge transfer efficiencies became very low and the dialysis was the main process responsible for the desalination. And the phosphate transfer from the anode chamber and potassium transfer from the cathode chamber could balance 1%-3% of the charge transfer in the MDC.
基金This work was partly supported by grants from the National Natural Science Foundation of China(Grant Nos.51278500 and 51308557)the Program of Guangdong Science&Technology Department(No.2017A010104007).
文摘The combination of the microbial electrolysis desalination and chemical-production cell(MEDCC)and Fenton process for the pesticide wastewater treatment was investigate in this study.Real wastewater with several toxic pesticides,1633 mg/L COD,and 200 in chromaticity was used for the investigation.Results showed that desalination in the desalination chamber of MEDCC reached 78%.Organics with low molecular weights in the desalination chamber could be removed from the desalination chamber,resulting in 28%and 23%of the total COD in the acid-production and cathode chambers,respectively.The desalination in the desalination chamber and organic transfer contributed to removal of pesticides(e.g.,triadimefon),which could not be removed with other methods,and of the organics with low molecular weights.The COD in the effluent of the MEDCC combined the Fenton process was much lower than that in the perixo-coagulaiton process(<150 vs.555 mg/L).The combined method consumed much less energy and acid for the pH adjustment than that the Fenton.
文摘以氮掺杂石墨烯(NG)催化微生物燃料电池(MFCs)的阴极,同时多级串并联方式连接MFCs与流动电极电容去离子(FCDI)装置,用以处理含盐废水。结果表明,NG-MFCs的产电脱氮性能明显提升,其最大输出电压为523 m V,NH_4^+-N的去除率达到92.7%;并联方式下的MFCs产电输出更加稳定,处理Na Cl质量浓度2 g/L的盐溶液,MFCs-FCDI装置的除盐率达到30%。因此,NG-MFCs以其输出能量FCDI进行除盐,可达到能源利用与污水处理的双重效果。
