Canadian Journal of Chemical Engineering, Vol.89, No.4, 914-920, 2011
AEROBIC GRANULAR TREATMENT OF 2,4-DICHLOROPHENOL
2,4-Dichlorophenol (2,4-DCP) fed aerobic granules were cultivated in a sequencing batch reactor (SBR). Stable and compact granules were obtained in 60 days of SBR operation. Formed granules were compact and strong with closed packed channels. After granulation, effluent chemical oxygen demand and 2,4-DCP concentrations were 95 and 2.5mgL(-1) with corresponding removal efficiencies of 96% and 95% were achieved. Degradation profile shows a high initial degradation rate which decreases later. Degradation rate was found to be directly proportional to the substrate concentration. Specific degradation rate of 2,4-DCP was 6.54mg 2,4-DCP gVSS(-1) h(-1) at 60mgL(-1) and specific cell growth rate was 0.042V +/- 0.02 day(-1). High optical density (OD600) the system shows effective retention of biomass which is the main advantage of present technique.