WANGSi-qi,ZHANGLian,HEJu-yuan,et al.Efficiency and Mechanism of DN-PN/A Process in Treating Wastewater in a Landfill[J].China Water & Wastewater,2025,41(15):17-23.
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Efficiency and Mechanism of DN-PN/A Process in Treating Wastewater in a Landfill

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第15期 Page: 17-23 Column: Date of publication: 2025-08-01
Author(s):
WANG　Si-qi1; 2;  ZHANG　Lian2;  HE　Ju-yuan2;  SHI　Xu-chuan2;  CHEN　Fu-ming2;  DONG　Wen-yi1;  XIAO　Xiong3;  LIANG　Zhao-qi4;  DENG　Zhou4
（1. School of Ecology and Environment， Harbin Institute of Technology ， Shenzhen 518057， China； 2. Qingyan Environmental Technology Co. Ltd.， Shenzhen 518057， China； 3. Shenzhen Xiaping Environmental Park， Shenzhen 518057， China； 4. Shenzhen Lisai Environmental Protection Technology Co. Ltd.， Shenzhen 518057， China）
Keywords:
wastewater in landfill;  partial nitritation;  anaerobic ammonium oxidation;  pre-denitrification;  nitrogen removal
Abstract:
An integrated partial nitritation-anaerobic ammonium oxidation process combined with pre-denitrification (DN-PN/A) was developed and applied to the treatment of wastewater in a landfill. The nitrogen removal efficiency and underlying mechanisms of the DN-PN/A process were systematically investigated. The TN removal efficiency and removal load achieved by the DN-PN/A process stably reached approximately 95% and 0.40 kg/(m3·d), respectively. The effluent TN remained consistently below 40 mg/L, meeting the requirements specified in Standard for Pollution Control on the Landfill Site of Municipal Solid Waste (GB 16889-2008). Analysis of carbon and nitrogen removal performance, as well as microbial community composition, indicated that the pre?denitrification primarily contributed to COD removal. Increasing the reflux ratio could effectively enhance the denitrification process, mitigate the impact of influent COD on the PN/A reactor, and ensure the stable operation of the anaerobic ammonium oxidation reaction within the PN/A reactor. This improvement led to higher removal efficiencies of both TN and COD in the DN-PN/A system. The PN/A reactor mainly facilitated efficient biological nitrogen removal through the synergistic activity of ammonia-oxidizing bacteria (such as Nitrosomonas and Ellin6067) and anaerobic ammonium?oxidizing bacteria (Candidatus_Kuenenia), thereby achieving stable and effective TN removal.
Last Update: 2025-08-01