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Updated: May 28, 2025

A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
Published on: December 25, 2015
Advanced nitrogen removal from extremely low carbon/nitrogen ratio municipal wastewater by optimizing multiple
Yanru Cui1, Liang Zhang1, Hanbin Wang1
1National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124 PR China.
Abstract:
The advantages of step-feed and intermittent aeration have been well-documented, however, combining them to enhance nitrogen removal in anaerobic/oxic/anoxic systems has been rarely explored. This study established the non-single-form anoxic stages by step-feed and intermittent aeration and finally enhanced the nitrogen removal of real municipal wastewater with step-feed anaerobic/oxic/anoxic/oxic/anoxic operation mode. Results revealed that Candidatus_Brocadia increased from 0.00 % to 0.21 % in the suspended sludge system, contributing 54.7 % of the nitrogen removal. Partial nitrification (PN) and endogenous partial denitrification (EPD) supplied nitrite for Anammox. A comprehensive multi-pathway nitrogen removal system, encompassing PN, nitrification, partial denitrification, Anammox, EPD/Anammox, and denitrification was constructed. The system effectively reduced total inorganic nitrogen concentration to 3.6 ± 1.2 mg/L at a carbon/nitrogen ratio of 3.0 ± 0.3, achieving a nitrogen removal efficiency of 95.3 ± 1.5 %. This study provides a novel approach for the advanced treatment of municipal wastewater and enrichment of anaerobic ammonia-oxidizing bacteria.
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