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Efficient production of methane simultaneous with treating winery wastewater using microbial electrolysis cell(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2016 06
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Efficient production of methane simultaneous with treating winery wastewater using microbial electrolysis cell
SUN Xia1 2 XU Zhancheng3 XIANG Yuanying2 LIU Jian1 2 GAO Ping1 & LI Daping2**
1School of Life Sciences, Sichuan University, Chengdu 610064, China 2Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China 3Sichuan Jiannanchun Group Co. Ltd., State Accredited Enterprise Technical Centers, Mianzhu 618200, China
microbial electrolysis cells winery wastewater methane applied voltageenergy

In order to increase the methane production rate of winery wastewater, this experiment adopted a new type of single-chamber microbial electrolysis cell (MEC) to treat winery wastewater. We investigated the removal efficiency of COD, methane production rate, substrate removal and energy recovery efficiency under different applied voltage (0.4 V, 0.8 V, 1.2 V) conditions. The results showed that when the applied voltage was 0.8 V, COD removal load reached 7.09 ± 0.74 kg m-3 d-1, which was 1.69 times of the AD reactor 4.19 ± 0.5 kg m-3 d-1. With the increase of the applied voltage, the degradation rate of ethanol was accelerated. In AD group, the degradation rate of ethanol reached 88.02 ± 15.13 mg L-1 h-1. With applied voltage of 0.4 V, 0.8 V, and 1.2 V, the corresponding rate was 121.84.17 ± 19.3 mg L-1 h-1, 256.45 ± 18.04 mg L-1 h-1, and 625.57 ± 81.76 mg L-1 h-1, respectively, which was 1.38, 2.91 and 7.1 times of AD. When the applied voltage was 0.8 V, methane production rate and the total energy recovery rate was 2019.78 ± 76.41 mL L-1 d-1 and 77.75 ± 0.88%, respectively, which was 2.37 times and 1.97 times of the 851.91 ± 48.31 mL L-1 d-1 and 39.59 ± 2.31% for AD. Cyclic voltammetry (CV) showed a significant reduction peak and oxidation peak of MEC group in the vicinity of -0.27 V and 0.035 V. Analysis by high-throughput sequencing found that the dominant flora of MEC were Methanothrix sp. and Geobacter sp., which accounted for 38.4% and 12.83%, respectively, of the mixed bacteria. But the AD groups were only 8.72% and 1.21%. The new type of microbial electrolysis cell can increase the methane production rate and improve the enery recovery rate at the same time.


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Last Update: 2016-12-30