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Updated: Aug 12, 2026

A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
Published on: December 25, 2015
Performance evaluation and model-based optimization of the mainstream deammonification in an integrated fixed-film
Mohamad-Javad Mehrani1, Mohammad Azari2, Burkhard Teichgräber3
1Department of Urban Water- and Waste Management, University of Duisburg-Essen, Universitätsstraße 15, 45141, Essen, Germany; Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Ul. Narutowicza 11/12, 80-233, Gdansk, Poland.
Abstract:
This study aimed to model and optimize mainstream deammonification in an integrated fixed-film activated sludge (IFAS) pilot plant under natural seasonal temperature variations. The effect of gradually decreasing temperature on the performance was evaluated during a winter season and a transition period to summer conditions, and the correlation of the performance parameters was investigated using principal component analysis (PCA). The optimization of intermittent aeration in the long-term (30 days) dynamic conditions with on/off ratio and dissolved oxygen (DO) set-point control was used to maximize the N-removal rate (NRR) and N-removal efficiency (NRE). Optimization results (DO set-point of 0.2-0.25 mgO2/L, and on/off ratio of 0.05) increased the NRE and NRR of total inorganic N (daily average) from 30% to > 50% and 15 gN/m3d to 25 gN/m3d, respectively. This novel long-term optimization strategy is a powerful tool for enhancing the efficiency in mainstream deammonification.
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