An upflow microaerobic sludge blanket reactor operating at high organic loading and low dissolved oxygen levels
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Updated: Jun 5, 2026

A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
Published on: December 25, 2015
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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