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Advanced treatment of tannery wastewater using the combination of UASB , SBR , electrochemical oxidation and BAF
Author(s) -
Liu WeiHong,
Zhang ChengGui,
Gao PengFei,
Liu Heng,
Song YanQiu,
Yang JianFang
Publication year - 2017
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.5037
Subject(s) - wastewater , effluent , chemical oxygen demand , sequencing batch reactor , waste management , sewage treatment , biodegradation , biochemical oxygen demand , pulp and paper industry , mixed liquor suspended solids , chemistry , environmental science , activated sludge , engineering , organic chemistry
BACKGROUND Wastewater discharged from tannery industries is highly complex, concentrated, and toxic. In view of the varying nature of discharged wastewater and the numerous small industries in China, there is a need for highly efficient treatment processes that are simple to operate and have low/reasonable construction and operating costs. RESULTS An integrated process of upflow anaerobic sludge bed ( UASB ) – sequencing batch reactor ( SBR ) – electrochemical oxidation ( EO ) – biological aerated filter ( BAF ) was developed at lab scale for the treatment of tannery wastewater with an initial chemical oxygen demand ( COD ) of 8300–9250 mg L −1 . The results show that, under the optimum conditions, the efficiency of removal of COD , total suspended solids, total nitrogen, ammonia, oil‐grease, S 2 − , total Cr and Cr 6+ was more than 90%, and the quality of the final effluent met the national discharge standard of China set for the leather tanning industry. The UASB process removed a considerable proportion of easily degradable organics and improved the biodegradability of the wastewater, while the SBR played an important role in the removal of nitrogen and residual COD . The EO process further enhanced the biodegradability of the SBR effluent, and finally, post‐polish treatment was accomplished in the BAF . The ecotoxicity of the wastewater was remarkably reduced after undergoing the hybrid treatment. CONCLUSION This work demonstrates that the hybrid system has the potential to be used for the advanced treatment of high‐strength tannery wastewater. © 2016 Society of Chemical Industry