Construction and operation of MLMB -MFC coupled with biocathode SND

doi:10.11949/0438-1157.20191094

Abstract

Abstract:

To effectively improve the denitrification efficiency and reduce the operating cost of microbial fuel cells, a new multi-channel and baffled membraneless microbial fuel cell (MLMB-MFC) was designed. The system coupled biological cathode simultaneous nitrification and denitrification (SND) to realize the synchronous denitrification and carbon removal while generating electricity. The startup and stable running of the system had been investigated. Moreover, the influence of different cathode dissolved oxygen (DO) and different carbon and nitrogen ratio (C/N) of the inflow on the electricity production and SND performance of MLMB-MFC were studied. The average power density was 42.65 mW·m^-3 after starting operation for 5 days. The maximum power density (P_M) was 94.22 mW·m^-3, the organic matter removal efficiency was 96.6% after stable operation. When the DO in the cathode was between 4.90—5.23 mg·L^-1 and the C/N ratio of inflow was 4, the total nitrogen (TN) removal efficiency was 27.9% and the SND rate was 48.7%, which can indicate that the system can integrate nitrification, heterotrophic denitrification and autotrophic denitrification into biological cathodes to achieve nitrogen removal.

Key words: electrochemistry, bioprocess, reduction, MLMB-MFC, SND

摘要：

为有效提高脱氮效率、降低微生物燃料电池运行成本，设计了一种新型多通道折流板无膜微生物燃料电池（MLMB -MFC）。该系统耦合生物阴极同步硝化反硝化（SND），实现产电的同时脱氮除碳。分别考察了系统的启动和运行情况，研究了不同阴极溶解氧（DO）和不同进水碳氮比（C/N）对MLMB-MFC的产电性能和SND效果的影响。经5 d启动运行后，平均功率密度达42.65 mW·m^-3，稳定运行后的最大功率密度（P_M）为94.22 mW·m^-3，有机物去除率为96.6%。阴极DO浓度为4.90~5.23 mg·L^-1、阳极基质C/N比为4时，总氮（TN）的去除率为27.9%，SND率为48.7%，表明该系统的生物阴极能较好地耦合硝化反应、异养反硝化反应和自养反硝化反应于一体，从而达到脱氮目的。

关键词: 电化学, 生物过程, 还原, 多通道折流板无膜微生物燃料电池, 同步硝化反硝化

CLC Number:

X 703

Shan HUANG, Yongze LU, Guangcan ZHU, Yun KONG. Construction and operation of MLMB -MFC coupled with biocathode SND[J]. CIESC Journal, 2020, 71(4): 1772-1780.

黄珊, 陆勇泽, 朱光灿, 孔赟. 耦合生物阴极SND的MLMB -MFC的构建与运行[J]. 化工学报, 2020, 71(4): 1772-1780.

Figures/Tables 7

Fig.1 Top view (a) and front view (b) of MLMB-MFC

Fig.2 Voltage at start-up of MLMB-MFC

Fig.3 COD, N and DO concentration variations of MLMB-MFC under stable operation

Fig.4 Polarization curve (a) and each region fitting internal resistance (b) of MLMB-MFC

Fig.5 Voltage of MLMB-MFC under different cathode DO concentration

Fig.6 Nitrogen concentration variations (a, b, c) and SND rate (d) of MLMB-MFC under different cathode DO concentration

Fig.7 Nitrogen and COD concentration variations (a, b, c, d) and SND rate (e) of MLMB-MFC under different anode C/N ratios

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