LI Liang.Application of MBBR in CAST Process Expanding and Upgrading Project[J].China Water & Wastewater,2021,37(20 20):87-91.
Application of MBBR in CAST Process Expanding and Upgrading Project
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
20 20
Page:
87-91
Column:
Date of publication:
2021-10-17
- Keywords:
- WWTP; CAST process; MBBR process; in-situ transformation; denitrification filter; magnetic coagulation sedimentation tank
- Abstract:
- The original capacity of a wastewater treatment plant (WWTP) in Guangdong Province is 20×104 m3/d. Its main process was cyclic activated sludge technology (CAST) and the effluent quality should meet the stricter value between the first level B criteria in Discharge Standard of Municipal Wastewater Treatment Plant (GB 18918-2002) and the local standards in Guangdong Province Discharge Limits of Water Pollutant (DB 44/26—2001). Under the premise of land limitation and no production suspension, the treatment capacity has to be increased to 25×104 m3/d, and the discharge standard is raised to the stricter value between the first level A criteria in GB 18918-2002 and the local standards in DB 44/26-2001. The combined process of upgrading and expanding project includes primary sedimentation tank, in-situ transformed CAST tank, denitrification filter, magnetic coagulation sedimentation tank, and ultraviolet disinfection. The CAST tank is in-situ transformed by adding moving bed biofilm reactor (MBBR) suspended fillers, increasing the filler interception system and fluidization system, and modifying the decanter, blast aeration system and sludge return system. The total investment of the project is about 214 million yuan. The project passed environmental protection acceptance in September 2020. The average effluent values of BOD5, COD, SS, NH3-N, TN, and TP from October to November were 3.0, 27.65, 6.5, 2.5, 9.96, and 0.42 mg/L respectively.
Last Update:
2021-10-17