CHENYa-song,ZHAOZheng.Diagnosis of Nitrogen Removal in Modified A2/O+A/O Process and Its Optimization Strategy[J].China Water & Wastewater,2022,38(21):64-71.
改良型A2/O+A/O工艺的脱氮诊断和优化调控策略
- Title:
- Diagnosis of Nitrogen Removal in Modified A2/O+A/O Process and Its Optimization Strategy
- 关键词:
- A2/O+A/O工艺; 脱氮; 优化调控; 控制因子; 污水处理厂
- Keywords:
- A2/O+A/O process; nitrogen removal; optimal regulation; control factor; wastewater treatment plant
- 摘要:
- 针对污水处理厂日趋严格的总氮排放要求，以某综合污水处理厂A2/O+A/O工艺为研究对象，开展了全过程的脱氮诊断分析。结果表明，缺氧区和前缺氧区是脱氮的主要区域，两者在不同月份的脱氮贡献占比分别为55.7%~60.8%、19.4%~28.5%；缺氧区的反硝化反应不稳定，其出水NO3--N>1.6 mg/L的比例高达35.5%；后缺氧区对NO3--N的去除率仅为13.9%。结合长期运行数据的诊断分析，建立了出水总氮的控制方程式，脱氮的关键控制因子为内外回流比、缺氧区出水NO3--N浓度和后缺氧区对NO3--N的去除量，通过工艺优化调控可实现该污水厂出水总氮<6 mg/L。
- Abstract:
- In view of the increasingly stringent requirements of total nitrogen discharge in wastewater treatment plants, the nitrogen removal of an A2/O+A/O process was diagnosed and analyzed in a comprehensive wastewater treatment plant. Anoxic zone and pre-anoxic zone were the main areas of nitrogen removal, which contributed 55.7%-60.8% and 19.4%-28.5% of the nitrogen removal respectively in different periods. Denitrification in the anoxic zone was unstable, and the effluent NO3--N was greater than 1.6 mg/L with a frequency as high as 35.5%. The actual removal rate of NO3--N in the post-anoxic zone was only 13.9%. A control equation for total nitrogen removal was established based on the diagnosis and analysis of long-term operational data. The key control factors affecting nitrogen removal were internal and external reflux ratio, effluentNO3--N concentration of the anoxic zone and the removal amount of NO3--N in the post-anoxic zone. The total nitrogen in effluent from the wastewater treatment plant could be less than 6 mg/L after process optimization.
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