Abstract
The variation of substrate concentration in anode chamber directly affects the power generation efficiency and decontamination performance of microbial fuel cell (MFC). In this study, three concentrations of swine wastewater with 800 mg/L, 1600 mg/L and 2500 mg/L were selected as substrates, and the performance of MFC and response characteristics of anode microbial community were investigated. The results show that the concentration of a selected substrate is positively correlated with the output voltage of MFC and chemical oxygen demand (COD) removal rate. The microbial community diversity in the anode chamber and the performance of battery can be significantly affected when concentration changes in different ways, which helps to selectively cultivate the adaptable dominant bacteria to enhance the stability and decontamination performance of MFC. The community structure of anodic biofilm is mainly composed of Proteobacteria, Bacteroidetes, Firmicutes, Chloroflexi and Spirochaetae. These findings are meaningful to improve the treatment effects of swine wastewater and can help to find out the mechanism of varying concentration that influences the production of microorganisms in MFC.
Highlights
It is well known that the swine industry has been developing rapidly over recent years [1]
In order cutoff to analyze sequences were clustered into operational taxonomic units (OTUs) with 97% similarity by the microbial community diversity and microbial community at all levels, the results weremicrobial used to
All reactors were started by using the swine wastewater with the same concentration
Summary
It is well known that the swine industry has been developing rapidly over recent years [1]. COD may have an inhibitory effect sustaining time of current generated in MFC by using turmeric water as a substrate decreased with the on microorganisms [13]. CODofmay an inhibitory on microorganisms performance use theworking actual wastewater They did not systematically explore most ofdid the not researches on the impact of COD on MFC performance did not use the the effect of wastewater concentration on microbial community structure, not to mention the influence actual wastewater. They did not systematically explore the effect of wastewater concentration mechanism of concentration on MFC [14].
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