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Treatment of Food Industry Waste by Bench‐Scale Upflow Anaerobic Sludge Blanket‐Anoxic‐Aerobic System
Author(s) -
Gohil Alpesh,
Nakhla George
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 - 10.2175/106143005x73019
Subject(s) - chemical oxygen demand , biochemical oxygen demand , effluent , hydraulic retention time , chemistry , wastewater , total suspended solids , kjeldahl method , pulp and paper industry , denitrification , nitrification , anoxic waters , volatile suspended solids , suspended solids , anammox , environmental engineering , nitrogen , environmental chemistry , environmental science , denitrifying bacteria , organic chemistry , engineering
An upflow anaerobic sludge blanket (UASB)‐anoxic‐aerobic system was used for treatment of tomato and bean processing wastewater. At various hydraulic retention times, ranging from 0.7 to 5 days, excellent removal of chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS), ammonia‐nitrogen (NH 4 ‐N), and total Kjeldahl nitrogen was achieved with final effluent BOD/TSS/NH 4 ‐N concentrations of less than 15/15/1 mg/L. Biogas yield in the UASB reactor varied from 0.33 to 0.44 m 3 /kgCOD removed . The kinetics of anaerobic treatment were investigated. The yield coefficient was 0.03 gVSS/gCOD; maximum specific growth rate was 0.24 day −1 ; Monod half velocity constant was 135 mgCOD/L; and specific substrate utilization rate was 3.25 gCOD/gVSS · d. Nitrification and denitrification kinetics were studied in batch experiments, and the rates were comparable with those in the continuous flow system.