The organic removal of adsorption-anaerobic sequencing batch reactor

Efficiencies and characteristics of organic compounds removal were studied in an adsorption-anaerobic sequencing batch reactor(AB-ASBR), and compared with an ordinary anaerobic sequencing batch reactor(ASBR).The full cream powdered milk wastewater was used as reactors influent. The effluent COD concentrations of AB-ASBR were lower than 100mg/L and 95 to 96 percent of COD removal was obtained when the AB-ASBR was fed a total chemical oxygen demand (COD) concentration of 2000mg/L. Rapid COD removal was observed in A-stage of the AB-ASBR within 30 minutes after fill period, 90 percent COD removal was contributed by anaerobic granular sludge initial stage adsorption of insoluble COD onto the anaerobic granular sludge. The half-saturation constant (Ks) of B-stage was calculated as 5.4mg/L, which indicated the anaerobic granular sludge in B-stage of the AB-ASBR had a better affinity for soluble COD and lower effluent COD concentration comparing with the ordinary ASBR.