Abstract
Aerobic activated sludge process (AAS) is the most widely used biological wastewater treatment process, and its treatment efficiency is affected by dissolved oxygen (DO) concentration and mass transfer rate. Herein, high-gravity technology (Higee), an efficient mass transfer enhancement technique, was used to enhance AAS to improve municipal wastewater treatment efficiency. Compared with AAS, AAS enhanced by Higee (Higee-AAS) shortened the time to reduce chemical oxygen demand and NH3-N to below the discharge limits by 1/3 and 3/5, respectively. The removal efficiency of aliphatic/proteins by Higee-AAS is about 4 times that of AAS. Intensification mechanisms were revealed from the changes of DO concentration, sludge morphology, and microbial activity. DO increased dramatically, and activated sludge became more dispersed with smaller particle size, which facilitated contact between oxygen and sludge, improving oxygen utilization rate and microbial activity. This study provides a basis for the application of Higee-AAS on an industrial scale.
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