Water Science and Technology Vol 36 No 2-3 pp 337344 © IWA Publishing 1997
ASBR treatment of low strength industrial wastewater at psychrophilic temperatures
Gouranga C. Banik and Richard R. Dague
Department of Civil Engineering, Iowa State University, 394 Town Engineering Building Ames, Iowa 50011 USA
Anaerobic treatment of dilute wastewater was studied using three laboratory-scale anaerobic sequencing batch reactors (ASBR), each with an active volume of six (6) liters. The reactors were fed a synthetic substrate made from non-fat dry milk supplemented with nutrients and trace metals. The COD and BOD5 of the feed was 600 mg/l and 285 mg/l, respectively. Steady-state performance data were collected at reaction temperatures of 25, 20, 17.5, 15, 12.5, 10, 7.5 and 5oC over a period of two years. Hydraulic retention times (HRT) were maintained at 24, 16, 12, 8 and 6 hours.
Results showed that the ASBR process was capable of achieving in excess of 90% soluble COD and BOD5 removal at temperatures of 25oC and 20oC at all HRTs. At the low temperature of 5oC and the six hour HRT, soluble COD and BOD5 removals were 62% and 75%, respectively. At the intermediate temperatures from 20oC down to 5oC and HRTs between 24 and 6 hours, removal of soluble organics ranged between 62 and 90 % for COD and 75 and 90 % for BOD5. In all cases, SRT were high enough to maintain good performance. Substrate utilization rates and half-velocity constants were also determined at all temperatures. The temperature correction coefficient was found to be 1.08 in the temperature range from 25oC to 7.5oC which follows the Q10 or Van't Hoff's rule.
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