ZHOUJian-zhong,HUXiao,WANGQi-lin,et al.Application of Multi-stage AO Process in Dougouhe No.2 Underground Wastewater Treatment Plant[J].China Water & Wastewater,2022,38(20):48-54.
Application of Multi-stage AO Process in Dougouhe No.2 Underground Wastewater Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第20期
Page:
48-54
Column:
Date of publication:
2022-10-17
- Keywords:
- underground wastewater treatment plant; multi-stage AO biochemical tank; high- efficiency sand sedimentation tank; denitrifying filter
- Abstract:
- The design scale of Dougouhe No.2 wastewater treatment plant is 10.0×104 m3/d, which is the largest underground wastewater treatment plant that has been built and put into operation in Sichuan Province. The three-stage wastewater treatment process consists of multi-stage AO biochemical tank, rectangular round?in and round-out secondary clarifier, denitrifying filter and high-efficiency sand sedimentation tank. The operation results showed that the effluent quality reached the limit specified in Discharge Standard of Water Pollutants in Minjiang River and Tuojiang River Basin in Sichuan Province (DB 51/2311-2016). The project has the technical characteristics such as integration of structures, stringent standards of effluent quality and high efficiency of the treatment process. The plant has internal and external reclaimed water reuse system, and green energy-saving technologies such as accurate aeration control system and sewage source heat pump central air conditioning system. The technologies of shrinkage-compensating concrete, expansion strengthening band and strengthening horizontal reinforcement of the structure were adopted to solve the temperature and shrinkage stress of concrete in early stage, and the distributed automatic control method was applied to improve the reliability of wastewater treatment plant operation.
Last Update:
2022-10-17