Main content area

A novel partial-denitrification strategy for post-anammox to effectively remove nitrogen from landfill leachate

Wu, Lina, Li, Zhi, Zhao, Chen, Liang, Dawei, Peng, Yongzhen
The Science of the total environment 2018 v.633 pp. 745-751
anaerobic ammonium oxidation, bacterial communities, denitrification, landfill leachates, nitrifying bacteria, nitrogen, nitrogen content, quantitative polymerase chain reaction, wastewater
Anaerobic ammonia oxidation (anammox) has shown great promise for nitrogen removal in low C/N wastewater such as landfill leachate. However, 11% of NO3−-N is stoichiometrically produced, which decreases the total nitrogen (TN) removal efficiency. In this study, a strategy for post anammox was developed to effectively remove TN from leachate. A tandem conversion of NO3−-N to NO2−-N (partial denitrification) was accomplished by supplying substrate for subsequent anammox, by supplementing the electron donor deficient condition. This process greatly improved NH4+-N and TN removal from leachate, reaching a 95% efficiency. Quantitative real-time polymerase chain reaction results showed that a high abundance of anammox bacteria, with a titer of 109 copy numbers/L, was enriched, accounting for 9.66% of the total bacterial community, and indicating the success of this novel strategy for the TN removal in leachate.