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In this study, the effects of empty bed contact time (EBCT) and water temperature on the biodegradation of 9 halonitromethanes (HNMs) in biological activated carbon (BAC) process were investigated. Experiments were conducted at three water temperatures (10°C, 15°C and 25°C) and three EBCTs (5, 10 and 15 min). Increasing EBCT and water temperature increased the biodegradation efficiency of HNMs in BAC column. Dibromochloronitromethane (DBCNM) and tribromonitromethane (TBNM) showed the highest biodegradation efficiency, but chloronitromethane (CNM) and dichloronitromethane (DCNM) were the lowest. The kinetic analysis suggested a pseudo-first-order reaction model for biodegradation of 7 HNMs at various water temperatures and EBCTs. The pseudo-first-order biodegradation rate constants (kbio) of 7 HNMs ranged from 0.0797~0.7657 min at 10°C to 0.1245~1.8421 min at 25°C. By increasing the water temperature from 10°C to 25°C, the biodegradation rate constants (kbio) were increased 1.6~2.4 times.

Evaluation of Biodegradation Kinetic in Biological Activated Carbon (BAC) Process for Drinking Waste Treatment : Effects of EBCT and Water Temperature