Dynamic membrane filtration accelerates electroactive biofilms in bioelectrochemical systems  

作　　者：Jinning Wang Mei Chen Jiayao Zhang Xinyi Sun Nan Li Xin Wang 

机构地区：[1]MOE Key Laboratory of Pollution Processes and Environmental Criteria,Tianjin Key Laboratory of Environmental Remediation and Pollution Control,College of Environmental Science and Engineering,Nankai University,No.38 Tongyan Road,Jinnan District,Tianjin,300350,China [2]School of Environmental Science and Engineering,Tianjin University,No.35 Yaguan Road,Jinnan District,Tianjin,300350,China

出　　处：《Environmental Science and Ecotechnology》2024年第4期208-217,共10页环境科学与生态技术（英文）

基　　金：financially supported by the National Natural Science Foundation of China(52200059 and 22036004);“the Fundamental Research Funds for the Central Universities,”Nankai University(Grant 63231127).

摘　　要：Bioelectrochemical systems(BES)have emerged as a dual-function technology for treating wastewater and recovering energy.A vital element of BES is the rapid formation and maintenance of electroactive biofilms(EABs).Previous attempts to accelerate EAB formation and improve electroactivities focused on enhancing the bacterial adhesion process while neglecting the rate-limiting step of the bacterial transport process.Here,we introduce membrane filtration into BES,establishing a dynamic membrane filtration system that enhances overall performance.We observed that optimal membrane flux considerably reduced the startup time for EAB formation.Specifically,EABs established under a 25 L m^(-2)h^(-1)flux(EAB_(25)LMH)had a formation time of 43.8±1.3 h,notably faster than the 51.4±1.6 h in the static state(EAB_(0)LMH).Additionally,EAB_(25)LMH exhibited a significant increase in maximum current density,approximately 2.2 times higher than EAB_(0)LMH.Pearson correlation analysis indicated a positive relationship between current densities and biomass quantities and an inverse correlation with startup time.Microbial analysis revealed two critical findings:(i)variations in maximum current densities across different filtration conditions were associated with redox-active substances and biomass accumulation,and(ii)the incorporation of a filtration process in EAB formation enhanced the proportion of viable cells and encouraged a more diverse range of electroactive bacteria.Moreover,the novel electroactive membrane demonstrated sustained current production and effective solid-liquid separation during prolonged operation,indicating its potential as a viable alternative in membrane-based systems.This approach not only provides a new operational model for BES but also holds promise for expanding its application in future wastewater treatment solutions.

关 键 词：Electroactive biofilm Membrane filtration Spatial structure Mass transfer Microbial community 

分 类 号：X703[环境科学与工程—环境工程]