Microbial fuel cell (MFC) embedded in anaerobic-anoxic-oxic (A2/O) process has positive effects on wastewater treatment, which can enhance the efficiencies of pollutants’ removal, along with electricity production. B...Microbial fuel cell (MFC) embedded in anaerobic-anoxic-oxic (A2/O) process has positive effects on wastewater treatment, which can enhance the efficiencies of pollutants’ removal, along with electricity production. But the electricity generation performance and its optimization of MFC embedded in A2O process still needs to be further investigated. In this study, in order to optimize the contaminants removal and electricity production of the MFC-A2/O reactor, a lab-scale corridor-style MFC-A2/O reactor, which could simulate the practical A2/O biological reactor better, was designed and operated. The removal efficiencies of chemical oxygen demand, total nitrogen and total phosphorus were continuously monitored so as the electricity generation. In addition, the influences of the structural parameters’ changes of MFC on the output voltage, including electrode material, the directly connected area and the distance between electrodes, were also studied. The results elucidated that the effluent quality of A2/O reactor could be improved when MFC was embedded, and all the investigated structural factors were closely related to the electricity generation performance of MFC to some extent.展开更多
Anaerobic digestion is often used as an approach to deal with high COD waste streams. Compared to the aeration systems it allows better energy management due to the biogas production but also has several limitations i...Anaerobic digestion is often used as an approach to deal with high COD waste streams. Compared to the aeration systems it allows better energy management due to the biogas production but also has several limitations including inlet waste streams quality and the additional equipment required for energy harvesting. In recent years, the bio-electrochemical systems (BES) and processes are intensively studied as a method for organic waste utilization, including wastewater. They potentially could bring several benefits to the wastewater treatment, mainly due to avoiding aeration (and aeration cost) and direct energy recovering in the form of electricity. Besides their anaerobic nature, the biological processes in BES are respiration-like contrary to the fermentative degradation typical for conventional anaerobic digestion which eventually will provide better mineralization and higher efficiency in terms of COD and BOD removal in such reactors. This study is a direct comparison between conventional anaerobic digestion and Microbial Fuel Cell (as a typical BES reactor) during utilization of wastewater from industrial production of ethanol by fermentation. COD removal rates and dynamics, energy recovery properties and parameters such as secondary sludge production are investigated in order to characterize the feasibility and technological readiness of BES as a step towards their commercialization.展开更多
Fluidized bed reactor is widely used in coal char-CO2 gasification. In this work, the production of syngas by using a fluidized bed gasification technique was first investigated and then the effect of the produced syn...Fluidized bed reactor is widely used in coal char-CO2 gasification. In this work, the production of syngas by using a fluidized bed gasification technique was first investigated and then the effect of the produced syngas on the performance of the solid oxide fuel cell with a configuration of La0.4Sr0.6Co0.2 Fe0.7 Nb0.1O3-δ//La0.8Sr0.2Ga0.83Mg0.17O3-δ//La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ（LSCFN//LSGM//LSCFN） was studied. During the syngas production, we found that the volume fraction of CO increased with the increment of gasification temperature, and it reached a maximum value of 88.8%, corresponding to a composition of 0.76% H2, 88.8% CO, and 10.44% CO2, when the ratio of oxygen mass flow rate to that of coal char （Mo2/Mchar） increased to 0.29. In the following utilization of the produced syngas in solid oxide fuel cells, it was found that the increasing CO volume fraction in the syngas results in a gradual increase of the peak power density of the LSCFN//LSGM//LSCFN cell. The maximum peak power density of 410 mW/cm^2 was achieved for the syngas produced at 0.29 of Mo2/Mchar. In the stability test, the cell voltage decreased by 4% at a constant current density of 0.475 A/cm^2 after 54 h when fueled with the syngas with the composition of 0.76% H2, 88.8% CO, and 10.44% CO2. It reveals that a carbon deposition with the content of 13.66% in the anode is attributed to the cell performance degradation.展开更多
Methane has been demonstrated to be a feasible substrate for electricity generation in microbial fuel cells(MFCs)and denitrifying anaerobic methane oxidation(DAMO).However,these two processes were evaluated separately...Methane has been demonstrated to be a feasible substrate for electricity generation in microbial fuel cells(MFCs)and denitrifying anaerobic methane oxidation(DAMO).However,these two processes were evaluated separately in previous studies and it has remained unknown whether methane is able to simultaneously drive these processes.Here we investigated the co-occurrence and performance of these two processes in the anodic chamber of MFCs.The results showed that methane successfully fueled both electrogenesis and denitrification.Importantly,the maximum nitrate removal rate was significantly enhanced from(1.4±0.8)to(18.4±1.2)mg N/(L·day)by an electrogenic process.In the presence of DAMO,the MFCs achieved a maximum voltage of 610 mV and a maximum power density of 143±12 mW/m^(2).Electrochemical analyses demonstrated that some redox substances(e.g.riboflavin)were likely involved in electrogenesis and also in the denitrification process.High-throughput sequencing indicated that the methanogen Methanobacterium,a close relative of Methanobacterium espanolae,catalyzed methane oxidation and cooperated with both exoelectrogens and denitrifiers(e.g.,Azoarcus).This work provides an effective strategy for improving DAMO in methane-powered MFCs,and suggests that methanogens and denitrifiers may jointly be able to provide an alternative to archaeal DAMO for methane-dependent denitrification.展开更多
分别驯化、培养厌氧消化菌和反硝化菌,以间距180μm(80目)的不锈钢网为电极,构建了单室型无质子交换膜微生物燃料电池(MFC)污水处理系统,厌氧消化菌在阳极附着成膜组成生物阳极氧化去除有机污染物,反硝化菌在阴极附着成膜组成生物阴极...分别驯化、培养厌氧消化菌和反硝化菌,以间距180μm(80目)的不锈钢网为电极,构建了单室型无质子交换膜微生物燃料电池(MFC)污水处理系统,厌氧消化菌在阳极附着成膜组成生物阳极氧化去除有机污染物,反硝化菌在阴极附着成膜组成生物阴极反硝化去除含氮污染物,实现污水深度处理。在电池系统稳定运行期间,最高开路电压为182.5 mV时,COD的去除率为96.5%;NH4+-N和NO3-N的去除率分别高于93.5%和96.7%,出水中NO2-N的含量低于0.072 mg L 1。当阳极室和阴极室分开时,COD、NH4+-N和NO3-N的最大去除率之和分别为67.0%、76.9%和84.0%,均明显低于阳极室和阴极室连通的MFC系统的去除率,这表明该MFC系统具有良好的有机污染物和含氮污染物协同去除能力。展开更多
炼厂含油污水蕴藏巨大化学能,利用微生物燃料电池技术处理含油污水可在水质净化的同时以电能的形式回收此能量。研究以炼厂含油污水为燃料构建并启动双室微生物燃料电池,考察电池产电特性及对含油污水的降解特性。结果表明:电池输出电...炼厂含油污水蕴藏巨大化学能,利用微生物燃料电池技术处理含油污水可在水质净化的同时以电能的形式回收此能量。研究以炼厂含油污水为燃料构建并启动双室微生物燃料电池,考察电池产电特性及对含油污水的降解特性。结果表明:电池输出电压随阳极溶液浓度的增大而升高;电池开路电压为550.49 mV,最高输出功率密度262.8 mW m 3,内阻957,其中,欧姆内阻482,占总内阻的50.4%;对进水水质指标检测和GC-MS分析结果显示,电池对含油污水COD的降解达到81.8%,实验用含油污水有机组成主要为挥发酚、芳香烃和脂肪烃,其中挥发酚、芳香烃等特征污染物被优先吸附降解,并产生酸酯类、醇类等典型的厌氧代谢产物。展开更多
文摘Microbial fuel cell (MFC) embedded in anaerobic-anoxic-oxic (A2/O) process has positive effects on wastewater treatment, which can enhance the efficiencies of pollutants’ removal, along with electricity production. But the electricity generation performance and its optimization of MFC embedded in A2O process still needs to be further investigated. In this study, in order to optimize the contaminants removal and electricity production of the MFC-A2/O reactor, a lab-scale corridor-style MFC-A2/O reactor, which could simulate the practical A2/O biological reactor better, was designed and operated. The removal efficiencies of chemical oxygen demand, total nitrogen and total phosphorus were continuously monitored so as the electricity generation. In addition, the influences of the structural parameters’ changes of MFC on the output voltage, including electrode material, the directly connected area and the distance between electrodes, were also studied. The results elucidated that the effluent quality of A2/O reactor could be improved when MFC was embedded, and all the investigated structural factors were closely related to the electricity generation performance of MFC to some extent.
文摘Anaerobic digestion is often used as an approach to deal with high COD waste streams. Compared to the aeration systems it allows better energy management due to the biogas production but also has several limitations including inlet waste streams quality and the additional equipment required for energy harvesting. In recent years, the bio-electrochemical systems (BES) and processes are intensively studied as a method for organic waste utilization, including wastewater. They potentially could bring several benefits to the wastewater treatment, mainly due to avoiding aeration (and aeration cost) and direct energy recovering in the form of electricity. Besides their anaerobic nature, the biological processes in BES are respiration-like contrary to the fermentative degradation typical for conventional anaerobic digestion which eventually will provide better mineralization and higher efficiency in terms of COD and BOD removal in such reactors. This study is a direct comparison between conventional anaerobic digestion and Microbial Fuel Cell (as a typical BES reactor) during utilization of wastewater from industrial production of ethanol by fermentation. COD removal rates and dynamics, energy recovery properties and parameters such as secondary sludge production are investigated in order to characterize the feasibility and technological readiness of BES as a step towards their commercialization.
基金financially supported by the National Basic Research Program of China (Grant Nos. 2012CB215404, 2012CB215406)State Key Laboratory of Power Systems in Tsinghua University (No. SKLD15Z02, Fuel Cell Distributed Power Generation System)One-hundred Leading Talents Development Project for Progress on Science and Technology of Beijing (No. 041504130)
文摘Fluidized bed reactor is widely used in coal char-CO2 gasification. In this work, the production of syngas by using a fluidized bed gasification technique was first investigated and then the effect of the produced syngas on the performance of the solid oxide fuel cell with a configuration of La0.4Sr0.6Co0.2 Fe0.7 Nb0.1O3-δ//La0.8Sr0.2Ga0.83Mg0.17O3-δ//La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ（LSCFN//LSGM//LSCFN） was studied. During the syngas production, we found that the volume fraction of CO increased with the increment of gasification temperature, and it reached a maximum value of 88.8%, corresponding to a composition of 0.76% H2, 88.8% CO, and 10.44% CO2, when the ratio of oxygen mass flow rate to that of coal char （Mo2/Mchar） increased to 0.29. In the following utilization of the produced syngas in solid oxide fuel cells, it was found that the increasing CO volume fraction in the syngas results in a gradual increase of the peak power density of the LSCFN//LSGM//LSCFN cell. The maximum peak power density of 410 mW/cm^2 was achieved for the syngas produced at 0.29 of Mo2/Mchar. In the stability test, the cell voltage decreased by 4% at a constant current density of 0.475 A/cm^2 after 54 h when fueled with the syngas with the composition of 0.76% H2, 88.8% CO, and 10.44% CO2. It reveals that a carbon deposition with the content of 13.66% in the anode is attributed to the cell performance degradation.
基金supported by the National Natural Science Foundation of China(No.42077284)the Natural Science Foundation of Fujian Province,China(No.2020J02015)the Fund for Outstanding Young Scientific Talent Cultivation Program of Fujian Agriculture and Forestry University of China(No.XJQ201906).
文摘Methane has been demonstrated to be a feasible substrate for electricity generation in microbial fuel cells(MFCs)and denitrifying anaerobic methane oxidation(DAMO).However,these two processes were evaluated separately in previous studies and it has remained unknown whether methane is able to simultaneously drive these processes.Here we investigated the co-occurrence and performance of these two processes in the anodic chamber of MFCs.The results showed that methane successfully fueled both electrogenesis and denitrification.Importantly,the maximum nitrate removal rate was significantly enhanced from(1.4±0.8)to(18.4±1.2)mg N/(L·day)by an electrogenic process.In the presence of DAMO,the MFCs achieved a maximum voltage of 610 mV and a maximum power density of 143±12 mW/m^(2).Electrochemical analyses demonstrated that some redox substances(e.g.riboflavin)were likely involved in electrogenesis and also in the denitrification process.High-throughput sequencing indicated that the methanogen Methanobacterium,a close relative of Methanobacterium espanolae,catalyzed methane oxidation and cooperated with both exoelectrogens and denitrifiers(e.g.,Azoarcus).This work provides an effective strategy for improving DAMO in methane-powered MFCs,and suggests that methanogens and denitrifiers may jointly be able to provide an alternative to archaeal DAMO for methane-dependent denitrification.
文摘分别驯化、培养厌氧消化菌和反硝化菌,以间距180μm(80目)的不锈钢网为电极,构建了单室型无质子交换膜微生物燃料电池(MFC)污水处理系统,厌氧消化菌在阳极附着成膜组成生物阳极氧化去除有机污染物,反硝化菌在阴极附着成膜组成生物阴极反硝化去除含氮污染物,实现污水深度处理。在电池系统稳定运行期间,最高开路电压为182.5 mV时,COD的去除率为96.5%;NH4+-N和NO3-N的去除率分别高于93.5%和96.7%,出水中NO2-N的含量低于0.072 mg L 1。当阳极室和阴极室分开时,COD、NH4+-N和NO3-N的最大去除率之和分别为67.0%、76.9%和84.0%,均明显低于阳极室和阴极室连通的MFC系统的去除率,这表明该MFC系统具有良好的有机污染物和含氮污染物协同去除能力。
文摘炼厂含油污水蕴藏巨大化学能,利用微生物燃料电池技术处理含油污水可在水质净化的同时以电能的形式回收此能量。研究以炼厂含油污水为燃料构建并启动双室微生物燃料电池,考察电池产电特性及对含油污水的降解特性。结果表明:电池输出电压随阳极溶液浓度的增大而升高;电池开路电压为550.49 mV,最高输出功率密度262.8 mW m 3,内阻957,其中,欧姆内阻482,占总内阻的50.4%;对进水水质指标检测和GC-MS分析结果显示,电池对含油污水COD的降解达到81.8%,实验用含油污水有机组成主要为挥发酚、芳香烃和脂肪烃,其中挥发酚、芳香烃等特征污染物被优先吸附降解,并产生酸酯类、醇类等典型的厌氧代谢产物。
