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Treatment of Distillery Spent‐Wash by Ozonation and Biodegradation: Significance of pH Reduction and Inorganic Carbon Removal Before Ozonation
Author(s) -
Kumar Arun,
Saroj Devendra P.,
Tare Vinod,
Bose Purnendu
Publication year - 2006
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143005x78636
Subject(s) - biodegradation , ozone , chemistry , chemical oxygen demand , effluent , mineralization (soil science) , pulp and paper industry , anaerobic exercise , microbial consortium , environmental chemistry , waste management , environmental engineering , sewage treatment , nitrogen , organic chemistry , environmental science , microorganism , bacteria , physiology , genetics , engineering , biology
This study is aimed at exploring strategies for mineralization of refractory compounds in distillery effluent by anaerobic biodegradation/ozonation/aerobic biodegradation. Treatment of distillery spent‐wash used in this research by anaerobic‐aerobic biodegradation resulted in overall COD removal of 70.8%. Ozonation of the anaerobically treated distillery spent‐wash was carried out as‐is (phase I experiments) and after pH reduction and removal of inorganic carbon (phase II experiments). Introduction of the ozonation step resulted in an increase in overall chemical oxygen demand (COD) removal, with the highest COD removals of greater than 95% obtained when an ozone dose of approximately 5.3 mg ozone absorbed/mg initial total organic carbon was used. The COD removal during phase II experiments was slightly superior compared with phase I experiments at similar ozone doses. Moreover, efficiency of ozone absorption from the gas phase into distillery spent‐wash aliquots was considerably enhanced during phase II experiments.