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[A study on ANAMMOX A2/O process for ammonium-rich leachates]
Zongsheng Zhao1, Bingwei Li, Hongliang Liu
1School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China. zhaozongs@vip.sina.com
Huan Jing Ke Xue= Huanjing Kexue
|February 11, 2004
Summary
Integrating the Anammox reaction into the A2/O process significantly enhances total nitrogen removal from ammonium-rich leachate by 32%. This advanced wastewater treatment method improves effluent quality and reduces key nitrogen compounds.
Area of Science:
- Environmental Microbiology
- Wastewater Treatment Engineering
- Biochemical Reaction Kinetics
Context:
- Ammonium-rich leachate poses significant wastewater treatment challenges.
- Conventional A2/O processes struggle with high nitrogen loads.
- Recycling aerobic effluent to anaerobic fluidized beds enables Anammox integration.
Purpose:
- To investigate the feasibility and efficiency of the Anammox reaction in an A2/O process for treating ammonium-rich leachate.
- To quantify the total nitrogen (TN) removal rate and compare it with conventional A2/O processes.
- To analyze the impact of Anammox integration on nitrogen species concentrations and overall effluent quality.
Summary:
- The study successfully implemented the Anammox (Anaerobic Ammonium Oxidation) reaction by recycling aerobic effluent to an anaerobic fluidized bed within an A2/O process.
- This ANAMMOX A2/O process achieved a notable TN removal rate of 32% for ammonium-rich leachate, a 15%-20% improvement over standard A2/O.
- Significant reductions in nitrite-nitrogen (NO2(-)-N) concentration and the NO2(-)-N/NOx(-)-N ratio were observed, leading to improved effluent quality.
- Kinetic analysis revealed a total reaction order of 3 for the Anammox process, with individual orders of 1 for NH4(+)-N, NO2(-)-N, and NO3(-)-N, and a reaction constant of -3.43E-5 L2.(mmol2.h)-1.
Impact:
- Enhanced nitrogen removal efficiency in wastewater treatment, particularly for challenging ammonium-rich streams.
- Improved overall effluent quality, meeting stricter environmental discharge standards.
- Provides valuable kinetic data for optimizing and designing Anammox-integrated wastewater treatment systems.