Feasibility of achieving advanced nitrogen removal via endogenous denitratation/anammox
Wenkang Lu1, Bin Ma1, Qingqing Wang1
1Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, School of Ecological and Environmental Science, Hainan University, Haikou 570228, China.
Abstract:
For achieving advanced nitrogen removal, a simultaneous endogenous denitratation/anammox (EDA) process was developed that could be undertaken in a sequencing batch reactor. The results indicated that, when the influent COD/TN ratio was 3.16, the advanced nitrogen removal was achieved with the effluent TN of 1.87 mg/L. Nitrogen removal by anammox accounted for 76% of TN removed in the EDA process. Microbial community analysis illuminated that anammox bacteria and denitrifying glycogen accumulating organisms (DGAOs) of 0.91% and 5.05% were detected, respectively. DGAOs could provide nitrite for anammox by using the intracellular carbon source to achieve advanced nitrogen removal. Additionally, based on the EDA process, a promising technique for achieving advanced nitrogen removal was proposed to reduce the consumptions of both the oxygen and the carbon sources.
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