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Updated: Apr 5, 2026

A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
Published on: December 25, 2015
Nitrogen removal performance and microbial distribution in pilot- and full-scale integrated fixed-biofilm activated
Liang Zhang1, Shujun Zhang2, Yongzhen Peng3
1Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing, China; Beijing Drainage Group Co. Ltd (BDG), Beijing, China.
Abstract:
Nitritation-anammox process was successfully established in pilot- and full-scale integrated fixed-film activated sludge (IFAS) reactors. An average nitrogen removal efficiency of 80% was achieved under ammonium loading rate of 0.7-1.3kgN/(m(3)d) in the pilot-scale reactor (12m(3)). Moreover, molecular analysis showed that ammonium oxidizing bacteria (AOB) were more abundant in the activated sludge while anammox bacteria were primarily located in the biofilm. The segregation of AOB and anammox bacteria enhanced the nitrogen removal rate and operational stability. Furthermore, a full-scale IFAS reactor of 500m(3) was set-up to treat sludge dewatering liquors. An average nitrogen removal efficiency of 85% and a nitrogen removal rate of 0.48kgN/(m(3)d) were achieved after inoculation. It was noted that high influent suspended solids would seriously affect the performance of the IFAS system. Therefore, a pre-treatment was proposed to reduce suspended solid in the full-scale application.
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