HaoMuyuan,ShiFeng,YangChenguang,et al.Retrofit Design of CASS Process to A2O+MBR+Sulfur Autotrophic Denitrification Filter (SADF)[J].China Water & Wastewater,2026,42(14):93-98.
CASS改造为A2O+MBR+SADF提标设计
- Title:
- Retrofit Design of CASS Process to A2O+MBR+Sulfur Autotrophic Denitrification Filter (SADF)
- Keywords:
- CASS process; A2O+MBR process; sulfur autotrophic denitrification filter(SADF); upgrading and retrofit; Wei River basin
- 摘要:
- 河北省卫河流域某经济技术开发区污水处理厂工程规模为3万m3/d，原采用循环活性污泥系统（CASS）工艺，提标改造要求出水水质达到《地表水环境质量标准》（GB 3838—2002）准Ⅳ类标准（TN≤10 mg/L）。针对该厂以生活污水为主，进水水质波动较大、总氮（TN）排放要求较高等特点，综合考虑用地条件、改造周期时序及水力流程等因素，设计中对生化池进行加高，紧凑利用2座CASS池中间的空余用地新建膜综合设备间，并结合不停水改造措施等，将CASS工艺改造为A2O+膜生物反应器（MBR）工艺，同时新增硫自养反硝化滤池（SADF）工艺。自2024年6月调试稳定运行以来，各项出水水质均满足排放要求。工程总投资约9 617.36万元，经营成本1.15元/m3。
- Abstract:
- A municipal wastewater treatment plant (WWTP) with a design capacity of 3×104 m3/d, located in an economic and technological development zone within the Wei River basin of Hebei Province, was originally equipped with a cyclic activated sludge system (CASS). To comply with the upgraded discharge standards, the effluent quality was required to meet the quasi-class Ⅳ criteria stipulated in the Environmental Quality Standards for Surface Water (GB 3838-2002), with a particularly stringent total nitrogen (TN) limit of ≤10 mg/L. Given that the influent was predominantly domestic sewage and was subject to considerable quality fluctuations, the retrofit strategy was systematically devised by taking into full account the limited site availability, construction phasing, and existing hydraulic profile continuity. The implemented modifications included raising the effective water depth of the existing biological reactors, and compactly utilizing the redundant space between the two CASS units for the construction of a new integrated membrane equipment room. Through in-situ renovation techniques that permitted continuous WWTP operation during the conversion period, the original CASS process was successfully retrofitted to an A2O + MBR process, supplemented by a newly added sulfur autotrophic denitrification filter (SADF) for enhanced nitrogen removal. Since stable operation began in June 2024, all effluent quality indicators have consistently met the prescribed discharge requirements. The total investment for the upgrading and retrofit project amounted to approximately 96.173 6 million CNY, with an operating cost of 1.15 CNY/m3.
相似文献/References:
[1]柳蒙蒙,陈彦霖,马晓龙,等.西北地区某污水厂CASS工艺提质增效工程设计[J].中国给水排水,2022,38(2):64.
LIU Meng?meng,CHEN Yan?lin,MA Xiao?long,et al.Process Design of a CASS Upgrading Project of a Wastewater Treatment Plant in Northwest China[J].China Water & Wastewater,2022,38(14):64.
[2]崔天怀,程军,杨坤.污水厂CASS工艺改为Bardenpho工艺不停水扩容改造[J].中国给水排水,2023,39(12):85.
CUITian-huai,CHENGJun,YANGKun.Design of a Wastewater Treatment Plant Expanded and Reconstructed from CASS Process to Bardenpho Process without Shutdown[J].China Water & Wastewater,2023,39(14):85.
[3]李志刚,韩文杰,杨忠启,等.四川某CASS污水厂连续流MBBR准Ⅳ类提标方案设计[J].中国给水排水,2025,41(2):52.
LI Zhi-gang,HANWen-jie,YANGZhong-qi,et al.Scheme Design for Continuous Flow Class Ⅳ Standard Upgrading Using MBBR Process in a WWTP with CASS Process in Sichuan[J].China Water & Wastewater,2025,41(14):52.