ZHANGRi-xia,WANGShe-ping,HUANGNing-jun,et al.Design of Upgrading and Renovation Project of a Sewage Treatment Plant in Xi’an without Interrupting Operation[J].China Water & Wastewater,2025,41(22):65-71.
Design of Upgrading and Renovation Project of a Sewage Treatment Plant in Xi’an without Interrupting Operation
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第22期
Page:
65-71
Column:
Date of publication:
2025-11-17
- Keywords:
- sewage treatment plant; without interrupting operation; upgrading and renovation; quasi-class Ⅳ surface water quality standard
- Abstract:
- The treatment capacity of a sewage treatment plant in Xi’an is 10×104 m3/d. Currently, the sewage treatment plant employs a treatment process primarily consisting of oxidation ditch combined with fiber disc filter. The ongoing upgrading and renovation project aims to enhance the effluent quality from the first level A limit specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) to meet quasi-class Ⅳ surface water quality standard, all while maintaining continuous operation. Based on a comprehensive evaluation of the existing configuration of the sewage treatment plant and the measured influent and effluent quality, the treatment capacity of the biological reaction tank was thoroughly reassessed. The proposed process optimization included reallocating flow distribution to the phase Ⅰ and Ⅱ oxidation ditches, constructing a new anaerobic tank to extend the total hydraulic retention time in the phase Ⅰ oxidation ditch, and installing a high-efficiency sedimentation tank and a denitrifying deep-bed filter downstream of the secondary clarifier. The project had a total investment of 138 million yuan and was commissioned for trial operation in December, 2022. To date, all effluent quality parameters have remained consistently within regulatory standards, demonstrating its effectiveness and providing a reliable reference for the upgrading and renovation of similar wastewater treatment facilities.
Last Update:
2025-11-17