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.
Quality and Efficiency Enhancement Retrofit Project of a WWTP Using AAO Process in Sichuan
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第4期
Page:
119-125
Column:
Date of publication:
2025-02-17
- Keywords:
- WWTP; industrial park; AAO process; quality and efficiency enhancement; energy saving and consumption reduction; carbon emission reduction
- 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.
Last Update:
2025-02-17