JINShao-ge.Application of Equalization/Anoxic, Contact Oxidation, High-efficiency Clarifier for Upgrading of Rural Domestic Sewage Treatment[J].China Water & Wastewater,2025,41(18):100-105.
Application of Equalization/Anoxic, Contact Oxidation, High-efficiency Clarifier for Upgrading of Rural Domestic Sewage Treatment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第18期
Page:
100-105
Column:
Date of publication:
2025-09-17
- Keywords:
- biological filter; constructed wetland; rural domestic sewage; upgrading; nitrogen and phosphorus removal
- Abstract:
- To meet the requirement of upgrading the effluent quality of a rural domestic sewage treatment station in Jiading District of Shanghai, from second level standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002) to first level B standard of Discharge Standard of Water Pollutants for Rural Sewage Treatment Facilities (DB31/T 1163-2019) in Shanghai, this study implemented a retrofitting process through technological reconfiguration. While retaining the main structures of the original biological filter and constructed wetland, new units, including equalization/anoxic tank, contact oxidation tank, and high-efficiency clarifier, were constructed, forming a treatment process as equalization/anoxic tank, biological filter, contact oxidation tank, high-efficiency clarifier, and constructed wetland. After retrofitting, the effluent concentrations of COD, SS, NH3-N, TN, and TP were measured as 19.0-26.0 mg/L, 5.0-9.0 mg/L, 1.9-3.6 mg/L, 9.6-14.3 mg/L, and 0.4-0.7 mg/L, respectively. The corresponding average removal rates reached 72%, 90%, 85%, 64%, and 78%, respectively. The effluent quality complied with the first level B standard in Shanghai. The upgrading system demonstrated stable and efficient operation, with enhanced nitrogen and phosphorus removal capabilities. It exhibited strong adaptability to low-concentration rural domestic sewage and maintained low operational costs of about 0.60 yuan/m3.
Last Update:
2025-09-17