ZHOUCheng,ZHOUYu-xiang,YEYang-yang,et al.Phased Upgrading and Reconstruction of a Chemical Industry Park WWTP in Nantong to Reduce Cost and Increase Efficiency[J].China Water & Wastewater,2024,40(12):114-119.
Phased Upgrading and Reconstruction of a Chemical Industry Park WWTP in Nantong to Reduce Cost and Increase Efficiency
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第12期
Page:
114-119
Column:
Date of publication:
2024-06-17
- Keywords:
- chemical industry park; ozone jet flow aeration; high-density clarifier; low temperature sludge drying; upgrading and reconstruction
- Abstract:
- The influent quality of a wastewater treatment plant (WWTP) in a chemical industrial park in Nantong is complex, which mainly treats the pre-treated sewage of pesticides, pharmaceuticals, fine chemicals and other enterprises in the park. However, the existing treatment system had the original design defects and the equipment was seriously aged, thus the effluent was unable to meet the level A criteria in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), while the high operating cost greatly increased the enterprise’s burden. Therefore, the WWTP adopted a phased upgrading and reconstruction, by adding physical and chemical pre-treatment, optimizing biochemical treatment section and adding terminal advanced treatment section. Finally, the combined treatment process of ozone oxidation tank, hydrolysis acidification tank, A/O tank, secondary sedimentation tank, Fenton oxidation tank, high-density clarifier, V-type filter was formed. The combined process of sludge conditioning, plate and frame pressure filtration and low temperature drying was adopted for physicochemical sludge treatment. After the completion of the transformation, the effluent quality met the standard requirements stably, and the comprehensive operation cost was reduced by 2.5 yuan/m3. In the face of the new standard of Jiangsu Province that may be implemented in the later period, the existing V-type filter could be transformed into a denitrification biofilter to achieve advanced nitrogen removal, and an activated carbon adsorption tank could be added at the end of the whole process as a safeguard measure to achieve the removal of COD and residual organic nitrogen.
Last Update:
2024-06-17