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Biodegradation of Laundry Wastewater Under Aerobic and Anaerobic Conditions: A Kinetic Evaluation
Author(s) -
Katam Keerthi,
Bhattacharyya Debraj
Publication year - 2017
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 - 10.2175/106143017x14902968254638
Subject(s) - anaerobic exercise , chemical oxygen demand , biodegradation , laundry , wastewater , chemistry , pulp and paper industry , bioreactor , volatile suspended solids , steady state (chemistry) , waste management , environmental engineering , environmental science , organic chemistry , biology , physiology , engineering
This research was conducted in a batch mode in a laboratory‐scale setup to study (1) the biodegradation of laundry wastewater under aerobic and anaerobic conditions and to quantify the degradation at steady‐state in terms of kinetic parameters and (2) the inhibition caused by laundry wastewater on growth‐substrate utilization by un‐acclimated ethanol‐enriched aerobic and anaerobic microbial cultures. The chemical oxygen demand (COD) removal was above 95% under aerobic condition; however, the COD removal varied between 70 and 88% under anaerobic condition. The steady‐state kinetic parameters k , K s , Y , μ m , and k d were 1.75 d –1 , 21.67 mg COD/L, 0.4 mg volatile suspended solids (VSS)/mg COD, 0.7 d –1 , and 0.06 d –1 respectively under aerobic condition; corresponding values under anaerobic condition were 4.7 d –1 , 173.67 mg COD/L, 0.06 mg VSS/mg COD, 0.3 d –1 , and 0.04 d –1 . Laundry wastewater caused a competitive inhibition at doses above 200 mg/L under aerobic and anaerobic conditions.