Study of swine farm wastewater treatment using electrochemical membrane bioreactor
Considering severe membrane fouling of the membrane bioreactor(MBR)and electricity generation characteristics of the microbial fuel cell(MFC)during wastewater treatment,this study constructed a novel electrochemical membrane bioreactor(EMBR)through integration of MBR and MFC.The feasibility and performance of swine farms wastewater treatment using EMBR were investigated in closed-circuit and open-circuit connections.The closed-circuit EMBR achieved a continuous and stable operation.Regarding power generation,the maximum power density,internal resistance,and Coulombic efficiency were 62.7 mW·m-2,229.1 Ω,and 15.5%,respectively.The removal rate of the closed-circuit EMBR for chemical oxygen demand(COD),ammonium(NH4+-N),total nitrogen(TN),and total phosphorus(TP)were 90.4%±0.5%,76.6%±1.8%,62.6%±1.6%,and 70.5%±3.4%,respectively.Compared with the open-circuit EMBR system,the removal rate of TN increased by 3.8%.The closed-circuit EMBR could effectively mitigate membrane contamination owing to its own generated electric field,and the membrane cleaning cycle was extended by 30%compared to that for the open-circuit EMBR.As an emerging wastewater treatment technology,EMBR can generate electricity for in-situ mitigation of membrane contamination and efficiently remove pollutants from swine farm wastewater.
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