Study of wastewater containing sodium citrate degraded by microbial fuel cell

doi:10.11949/0438-1157.20190428

Abstract

Abstract:

Sodium citrate (Na₃C₆H₅O₇) is widely used for food, medicine, chemical industry and many other fields due to its excellent performance. The extensive application has resulted in an increase of sodium citrate in industrial and municipal sewage and it aggravates the eutrophication of the water body. In this study, sodium citrate is applied as substrate for the anode electricigens and with which microbial fuel cell (MFC) represents good electricity generation performance. The results show that Na₃C₆H₅O₇-MFC achieves a maximum power density of 742.96 mW·m^-2, which is 1.77 and 1.12 times of that of sodium acetate (NaAc-MFC) and glucose (Glu-MFC), respectively. The start-up time of NaAc-MFC and Glu-MFC are about 1.8 and 2.9 times of that of Na₃C₆H₅O₇-MFC (57 h). The Coulombic efficiency of Na₃C₆H₅O₇-MFC is 61.31%, which is obviously superior to NaAc-MFC and Glu-MFC. This indicates that MFC can degrade sodium citrate in wastewater effectively, which provides a possibility of sodium citrate alone as substrate for MFC research.

Key words: sodium citrate, microbial, fuel cell, degradation, wastewater

摘要：

柠檬酸钠由于其优良的性质被广泛应用于食品、医药、化工等诸多领域，越来越广泛的应用导致工业和市政污水中柠檬酸钠的含量升高，加剧了水体的富营养化。将柠檬酸钠作为微生物燃料电池（microbial fuel cell, MFC）阳极底物，研究得到了柠檬酸钠单独作为混合菌种MFC底物时的产电性能。结果显示，与乙酸钠和葡萄糖相比，以柠檬酸钠为底物的MFC（Na₃C₆H₅O₇-MFC）获得的最大功率密度为742.96 mW·m^-2，是乙酸钠（NaAc-MFC）和葡萄糖（Glu-MFC）的1.77倍和1.12倍。NaAc-MFC和Glu-MFC的启动时间分别约为Na₃C₆H₅O₇-MFC（57 h）的1.8倍和2.9倍。同时，Na₃C₆H₅O₇-MFC对COD的去除率为87.65%，与NaAc-MFC和Glu-MFC相差不大。Na₃C₆H₅O₇-MFC的库仑效率高达61.31%，明显优于NaAc-MFC和Glu-MFC。实验结果表明MFC可以有效地降解柠檬酸钠，能够处理含柠檬酸钠废水，并为柠檬酸钠单独作为底物应用于MFC提供了依据。

关键词: 柠檬酸钠, 微生物, 燃料电池, 降解, 废水

CLC Number:

TK 6

Wenwen CHEN,Zhongliang LIU,Kejun JIANG,Junxian HOU,Xiaoge LOU,Yanxia LI,Qiang LIAO,Xun ZHU. Study of wastewater containing sodium citrate degraded by microbial fuel cell[J]. CIESC Journal, 2019, 70(S2): 322-328.

陈稳稳,刘中良,姜克隽,侯俊先,娄晓歌,李艳霞,廖强,朱恂. 微生物燃料电池处理含柠檬酸钠废水的研究[J]. 化工学报, 2019, 70(S2): 322-328.

Figures/Tables 7

Fig.1 Voltage output of experimental group

Fig.2 Voltage output of repeating group

Fig.3 Polarization curves and power density curves of Na3C6H5O7-MFC, NaAc-MFC and Glu-MFC

Fig.4 CVs of Na3C6H5O7-MFC, NaAc-MFC and Glu-MFC

Fig.5 EISs of Na3C6H5O7-MFC, NaAc-MFC and Glu-MFC

Fig.6 SEM images of CC (a), anodes of Na3C6H5O7-MFC (b), NaAc-MFC (c) and Glu-MFC (d) under ×5000

Table 1 COD removal rate and Coulombic efficiency of glucose, NaAc and Na3C6H5O7

MFC	周期持续时间t _b/h	COD₁	COD₂	COD去除率/%	库仑效率/%
Na₃C₆H₅O₇-MFC	约66	590.1	72.89	87.65	61.31
NaAc-MFC	约74	768.8	99.78	87.02	44.7
Glu-MFC	约68	1007.0	107.1	89.36	29.7

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