LI Liang,QIU Hong-jun.Application of Improved A2/O Oxidation Ditch Enhanced Biochemical Treatment Process for Upgrading the Wastewater Treatment Plant[J].China Water & Wastewater,2020,36(20 20):124-128.
Application of Improved A2/O Oxidation Ditch Enhanced Biochemical Treatment Process for Upgrading the Wastewater Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
20 20
Page:
124-128
Column:
Date of publication:
2020-10-17
- Keywords:
- upgrading; hydrolysis acidification process; improved A2/O oxidation ditch; precision filter
- Abstract:
- Due to the improvement of discharge standards and the increase of sewage quantity, the effluent quality of a WWTP in Zhuhai was raised from the first class B standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) to the stricter value between the first class A standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) and the Guangdong Provincial local standard of Discharge Limits of Water Pollutants (DB 44/26-2001). The design scale was expanded from 3×104 m3/d to 8×104 m3/d. The original treatment process of the WWTP was improved A2/O oxidation ditch. The upgrading project aimed at the characteristic of the influent contained industrial wastewater and the biochemical property was poor. The hydrolytic acidification process was set up to improve the biochemical property of the wastewater; the biological treatment retained the improved A2/O oxidation ditch process, and the nitrogen and phosphorus removal effect was strengthened by increasing the internal and external reflux ratio of sludge and increasing aeration; the SS was removed by precision filter in advanced treatment. The actual operation data showed that the effluent quality was stable up to the design standard after upgrading. In the project, biological treatment was fully used to solve the problem of nitrogen and phosphorus removal, the treatment process was simplified, and the project investment and operation cost was reduced.
Last Update:
2020-10-17