Cascade degradation of organic matters in brewery wastewater using a continuous stirred microbial electrochemical reactor and analysis of microbial communities.
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.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology. No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
Haiman
H
Wang
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology. No. 73 Huanghe Road, Nangang District, Harbin 150090, China.|School of Life Science and Technology, Harbin Institute of Technology. No. 2 Yikuang Street, Nangang District, Harbin 150080, China.
Youpeng
Y
Qu
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology. No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
Da
D
Li
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology. No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
John J
JJ
Ambuchi
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology. No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
Weihua
W
He
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology. No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
Xiangtong
X
Zhou
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology. No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
Jia
J
Liu
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology. No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
Yujie
Y
Feng
D000693:Anaerobiosis; D001105:Archaea / Q000235:genetics / Q000378:metabolism; D001419:Bacteria / Q000235:genetics / Q000378:metabolism; D018441:Biofilms; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002241:Carbohydrates / Q000302:isolation & purification; D055664:Electrochemical Techniques; D005232:Fatty Acids, Volatile / Q000302:isolation & purification; D005285:Fermentation; D011506:Proteins / Q000302:isolation & purification; D062065:Wastewater / Q000032:analysis / Q000382:microbiology*; D014871:Water Microbiology; D018508:Water Purification
D002241:Carbohydrates; D005232:Fatty Acids, Volatile; D011506:Proteins; D062065:Wastewater