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Updated: Jun 5, 2026

A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
Published on: December 25, 2015
An upflow microaerobic sludge blanket reactor operating at high organic loading and low dissolved oxygen levels
Shaokui Zheng1, Huijun Li, Cancan Cui
1MOE Key Laboratory of Water and Sediment Sciences/State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China. zshaokui@yahoo.com.cn
Abstract:
The activated sludge process (ASP) has high operational costs due to the need for aeration at dissolved O(2) (DO) levels of ≥2 mg l(-1) and high capital costs to construct large reactors due to a low organic loading [typically 1 kg chemical oxygen demand (COD) m(-3) day(-1)]. A novel method for improving the energy use and treatment efficiency of the ASP via limited oxygenation (0.4 mg DO l(-1)) and high organic loading (6.2 kg COD m(-3) day(-1)) is proposed based on a laboratory-scale ASP for ammonia-rich industrial wastewaters. The sludge blanket phenomenon and granulation occurred simultaneously in the upflow microaerobic reactor.
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