LI Liang.Application of MBBR in CAST Process Expanding and Upgrading Project[J].China Water & Wastewater,2021,37(20):87-91.
MBBR在CAST工艺扩容提质工程中的应用
- Title:
- Application of MBBR in CAST Process Expanding and Upgrading Project
- Keywords:
- WWTP; CAST process; MBBR process; in-situ transformation; denitrification filter; magnetic coagulation sedimentation tank
- 摘要:
- 广东省某水质净化厂现状处理规模为20×104 m3/d，采用CAST工艺，出水水质执行《城镇污水处理厂污染物排放标准》（GB 18918—2002）的一级B标准与广东省《水污染物排放限值》(DB 44/26—2001)一级标准的较严值。在用地紧张和不停产的前提下，需将处理规模提升至25×104 m3/d，出水水质提升至一级A标准和广东省《水污染物排放限值》（DB 44/26—2001）的较严值。扩容提质工艺路线为初沉池+CAST池原位改造+反硝化滤池+磁混凝沉淀池+紫外线消毒，其中CAST池原位改造主要是在现状CAST池内投加MBBR悬浮填料、增加填料拦截和流化系统，改造滗水器、鼓风曝气系统和污泥回流系统。该项目总投资约为2.14 亿元,于2020年9月通过环保验收，10月—11月的出水BOD5、COD、SS、NH3-N、TN、TP均值分别为3.0、27.65、6.5、2.5、9.96、0.42 mg/L。
- 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.
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