Cascade degradation of organic matters in brewery wastewater using a continuous stirred microbial electrochemical reactor and analysis of microbial communities
2016; Nature Portfolio; Volume: 6; Issue: 1 Linguagem: Inglês
10.1038/srep27023
ISSN2045-2322
AutoresHaiman Wang, Youpeng Qu, Da Li, John J. Ambuchi, Weihua He, Xiangtong Zhou, Jia Liu, Yujie Feng,
Tópico(s)Electrochemical sensors and biosensors
ResumoAbstract A continuous stirred microbial electrochemical reactor (CSMER), comprising of a complete mixing zone (CMZ) and microbial electrochemical zone (MEZ), was used for brewery wastewater treatment. The system realized 75.4 ± 5.7% of TCOD and 64.9 ± 4.9% of TSS when fed with brewery wastewater concomitantly achieving an average maximum power density of 304 ± 31 m W m −2 . Cascade utilization of organic matters made the CSMER remove a wider range of substrates compared with a continuous stirred tank reactor (CSTR), in which process 79.1 ± 5.6% of soluble protein and 86.6 ± 2.2% of soluble carbohydrates were degraded by anaerobic digestion in the CMZ and short-chain volatile fatty acids were further decomposed and generated current in the MEZ. Co-existence of fermentative bacteria ( Clostridium and Bacteroides , 19.7% and 5.0%), acetogenic bacteria ( Syntrophobacter , 20.8%), methanogenic archaea ( Methanosaeta and Methanobacterium , 40.3% and 38.4%) and exoelectrogens ( Geobacter , 12.4%) as well as a clear spatial distribution and syntrophic interaction among them contributed to the cascade degradation process in CSMER. The CSMER shows great promise for practical wastewater treatment application due to high pre-hydrolysis and acidification rate, high energy recovery and low capital cost.
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