针对甲烷厌氧氧化微生物燃料电池(anaerobic oxidation of methane-microbial fuel cells，AOM-MFC)阳极终产物多为二氧化碳(CO2)的问题，将微藻阴极引入AOM-MFC进行原位固碳。研究结果表明:当接种量为25%(体积分数)、接种龄为24 h、光照强度为8 000 lx、光照周期为12 h并以阳极出水作为反应器的阴极液时，微藻阴极反应器获得最大峰值电压((0。385±0。001)V)和最大生物量微藻质量浓度((576。33±1。53)mg/L);微藻阴极反应器的原位固碳过程由3部分组成，即阳极微生物利用甲烷(CH4)产生以CO2为主的代谢物和电子、阴极内微藻捕获并固定CO2产生氧气(O2)、产生的O2与质子和外电路传递到阴极的电子结合生成水;微藻阴极反应器具有一定的废水处理能力，并且能够将CH4中蕴含的化学能转化为电能和生物质能，有助于实现CH4高效转化过程中"零碳排放"。
Study on performance and influencing factors of in-situ carbon fixation by AOM-MFC with microalgae-cathode
As the final product of anaerobic oxidation of methane-microbial fuel cells(AOM-MFC)was carbon dioxide(CO2),microalgae-cathode was introduced into AOM-MFC for in-situ carbon fixation.The results show that the optimal operating conditions of microalgae-cathode reactor are as follows:inoculum amount is 25%(volume fraction),inoculation age is 24 h,light intensity is 8 000 lx,light cycle is 12 h,the catholyte of reactor is anode water.At the optimal operating conditions,the maximum peak voltage of the reactor is(0.385±0.001)V,and the maximum biomass mass concentration of microalgae is(576.33±1.53)mg/L.The specific process of carbon fixation in the microalgae-cathode reactor consist of three parts,i.e.,the microorganisms compose of methane oxidation archaea and electroactive bacteria in which methane(CH4)is used to produce metabolites dominated by CO2 and electrons,the microalgae in the cathode capture and immobilize CO2 which is used to produce oxygen(O2)through photosynthesis and the produced O2 is acted as a terminal electron acceptor to receive electrons transferred to the cathode and combined with protons to produce water.The reactor provides a certain wastewater treatment capacity and can convert the chemical energy contained in CH4 into electrical energy and biomass energy,contributing to achieving zero carbon emissions in the efficient CH4 conversion process.
anaerobic oxidation of methanemicrobial fuel cellmicroalgae-cathodein situcarbon fixation
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