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Bio‐augmented submerged membrane bioreactor as an effective application for treatment of biologically pretreated coal gasification wastewater
Author(s) -
Jia Shengyong,
Han Hongjun,
Zhuang Haifeng,
Hou Baolin
Publication year - 2016
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4751
Subject(s) - membrane bioreactor , wastewater , bioreactor , chemistry , pulp and paper industry , membrane fouling , hydraulic retention time , sewage treatment , fouling , chemical oxygen demand , coal , waste management , environmental science , membrane , environmental engineering , organic chemistry , engineering , biochemistry
BACKGROUND Coal gasification wastewater ( CGW ) is the most important wastewater of the coal chemical industry and if disposed of without adequate treatment can cause serious environmental pollution. Membrane bioreactors ( MBRs ) have been widely used for high strength wastewater treatment; however, conventional MBRs potentially fail when the BOD / COD of the biologically pretreated CGW ( BPCGW ) is low. In the present study, strategies were employed to enhance MBR performance. RESULTS A long‐term bio‐augmented submerged membrane bioreactor ( BSMBR ) has been developed for treatment of BPCGW . With the optimal methanol dosage of 30%, hydraulic retention time ( HRT ) of 24 h, granular activated carbon ( GAC ) dosage of 5 g L −1 and NaHCO 3 dosage ratio of 3:1 (amount NaHCO 3 to NH 4 + ‐N ratio, mol:mol), the concentrations of COD , total phenols and NH 4 + ‐N reached 39, 23 and 11 mg L −1 with removal efficiencies of 74%, 40% and 46%, respectively. HRT of 24 h and GAC dosage of 5 g L −1 facilitated membrane fouling mitigation while the co‐metabolism process with methanol speeded up membrane fouling. High NaHCO 3 dosage ratio (≥2:1) promoted nitritation‐type nitrification. CONCLUSION This study suggests that it is technically feasible to treat BPCGW by BSMBR , which can provide an environmentally acceptable way to further engineering application in coal chemical industries. © 2015 Society of Chemical Industry