Study on the Kinetics in the Adsorption- Biodegradation Anaerobic Sequencing Batch Reactor

The purpose of this work was to investigate the kinetics of the adsorption and biodegradation process in adsorption-biodegradation anaerobic sequencing batch reactor (AB-ASBR). Using the whole milk powder as substrate, the volume loading rate (VLR) of influent was 7.0kgCOD / (m³ · d) at 35°C. In order to maintain the optimal pH value, NaHCO₃ was added into the influent. The experiment indicated that the adsorption process was described well by the pseudo-second-order kinetic model with the adsorption capacities of 196.08 mg·g^-1 at the adsorption equilibrium and the rate constant (k₂) of 1.5×10^-3 g·mg^-1·min^-1. During the biodegradation, the saturation constant (Ks) of reactor B was 191.70 mg·L^-1, which was far lower than that given in the available literatures. It could be demonstrated that AB-ASBR was quite an effective way to treat the high concentration organic wastewater.