FENGShi-xun,ZHANGWan-li,CHENGMing-tao,et al.Design of a Wastewater Treatment Plant Upgrading and Reconstruction Process in the First-grade Protection Zone of Taihu Lake Basin[J].China Water & Wastewater,2022,38(6):76-80.
Design of a Wastewater Treatment Plant Upgrading and Reconstruction Process in the First-grade Protection Zone of Taihu Lake Basin
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第6期
Page:
76-80
Column:
Date of publication:
2022-03-17
- Keywords:
- Taihu Lake basin; upgrading and reconstruction; denitrification biofilter; high speed flotation tank
- Abstract:
- A wastewater treatment plant with a designed scale of 5.0×104 m3/d in the first?grade protection zone of Taihu Lake basin was upgraded according to the discharge limitation specified in Discharge Standard of Main Water Pollutants for Municipal Wastewater Treatment Plant & Key Industries of Taihu Area (DB 32/1072-2018). There are several engineering problems such as high effluent standard, limited removal capacity of current main structures, and no effective advanced treatment facilities in the current plant. To overcome these problems, the original CAST process in phase Ⅰ project and A2/O process in phase Ⅱ project were retained, a new denitrification biofilter and a high speed flotation tank as the advanced treatment facilities were constructed, and non-project measures, such as strengthening source control, increasing sludge concentration and sludge age, controlling dissolved oxygen and optimizing carbon source dosage point were adopted. After the transformation, the new process consists of coarse grid and inlet pump house, fine grid and cyclone settling tank, CAST tank (phase Ⅰ)/combined A2/O tank (phase Ⅱ), denitrification biofilter, high speed flotation tank and contact disinfection tank, and the effluent quality reaches the design standard stably. The total investment of the project is 95.504 6 million yuan, and the total treatment cost is increased by 0.98 yuan/m3.
Last Update:
2022-03-17