PAN Ming-bin,PAN Wei-long,CHEN Yan-bo,et al.Design of Separate Upgrading Project of a Wastewater Treatment Plant in a Large Comprehensive Chemical Park[J].China Water & Wastewater,2021,37(18 18):70-75.
Design of Separate Upgrading Project of a Wastewater Treatment Plant in a Large Comprehensive Chemical Park
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
18 18
Page:
70-75
Column:
Date of publication:
2021-09-17
- Keywords:
- separate upgrading; chemical park; industrial wastewater
- Abstract:
- The service area of a wastewater treatment plant (treatment capacity of 20×104 m3/d) in a large comprehensive chemical park in Zhejiang Province covers both the industrial park and urban residential area. Before upgrading, the percentage of industrial wastewater in the influent of the plant is about 54%. The effluent quality need to meet the first degree criteria specified in Integrated Wastewater Discharge Standard (GB 8978-1996), and the tail water is discharged into Hangzhou Bay. In the upgrading project, the overall scheme of separate collection and treatment of the domestic sewage and industrial wastewater was determined. The existing treatment process was split and transformed into two independent treatment processes with the treatment capacity of both 10×104 m3/d. One process was used for domestic sewage upgrading. The upgraded plan was to add a fiber rotary filter on the basis of the existing secondary biochemical treatment and high-efficiency sedimentation tank, in which the effluent quality reached the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). Another process was used for industrial wastewater upgrading treatment. The transformation scheme was to add a process of catalytic Fenton and activated carbon adsorption on the basis of the current process of flocculation and sedimentation, hydrolysis acidification and secondary biochemical treatment, and the effluent quality reached the first degree criteria specified in Integrated Wastewater Discharge Standard (GB 8978-1996) (COD≤80 mg/L). The newly built facilities for upgrading covered a footprint area of 2.87 hm2, all of which were made use of the open space in the plant. After the upgrading, the two processes run well, and the effluent quality is stable and reaches the national discharge standard. The investments of the domestic sewage and industrial wastewater upgrading projects are approximately 117 yuan/m3 and 1 920 yuan/m3, and the operating costs are increased by 0.08 yuan/m3 and 3.48 yuan/m3 on the original basis, respectively.
Last Update:
2021-09-17