DONGMing-fu,KONGHai-xia,ZHANGLin,et al.Quality and Efficiency Enhancement Retrofit Project of a WWTP Using AAO Process in Sichuan[J].China Water & Wastewater,2025,41(4):119-125.
四川某AAO工艺污水处理厂提质增效改造实例
- Title:
- Quality and Efficiency Enhancement Retrofit Project of a WWTP Using AAO Process in Sichuan
- Keywords:
- WWTP; industrial park; AAO process; quality and efficiency enhancement; energy saving and consumption reduction; carbon emission reduction
- 摘要:
- 四川省某污水处理厂一期工程原采用AAO主体工艺，现根据进厂废水水质进一步优化工艺设计参数，确保出水氨氮、总氮及COD指标达到《四川省岷江、沱江流域水污染物排放标准》（DB 51/2311—2016），总磷达到《地表水环境质量标准》（GB 3838—2002）的Ⅲ类标准（总磷<0.2 mg/L），其余指标达到《城镇污水处理厂污染物排放标准》（GB 18918—2002）的一级A标准，处理后的达标废水经管道就近引至干河子排放。该提质改造项目拟对原有AAO池、外回流等进行改造优化、增设活性炭吸附池。实施改造后运行8个月，监测结果显示全年平均出水NH3-N≤1.5 mg/L、TN≤4.6 mg/L、TP≤0.1 mg/L、COD≤20 mg/L，改造后出水水质均优于改造前，达到设计排放标准；节能降耗效果明显，碳排放强度同比降低20%以上。
- Abstract:
- AAO was the primary process originally in the phase I project of a wastewater treatment plant (WWTP) in Sichuan Province and the process parameters were further optimized based on the influent quality. The effluent ammonia nitrogen, total nitrogen, and chemical oxygen demand could meet the stipulated requirements specified in Discharge Standard of Water Pollutant in Sichuan Minjiang River and Tuojiang River Basin (DB 51/2311-2016). The effluent total phosphorus should comply with level Ⅲ criteria (<0.2 mg/L) in the Environmental Quality Standards for Surface Water (GB 3838-2002), while the remaining effluent indicators should adhere to the first level A criteria in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). The treated wastewater was directed for discharge into Ganhezi River through a pipeline. The project’s objective was to renovate and optimize the original AAO tank, external reflux system, and introduce an additional activated carbon adsorption unit. After 8 months of operation, the results indicated that the annual average effluent NH3-N, TN, TP, and COD were no more than 1.5 mg/L, 4.6 mg/L, 0.1 mg/L, and 20 mg/L, respectively. The effluent quality after retrofit surpassed the design discharge standards. The energy efficiency and consumption reduction are notable. Moreover, the carbon emission intensity was reduced by over 20% year-on-year.
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