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(2):52-57.
四川某CASS污水厂连续流MBBR准Ⅳ类提标方案设计
- Title:
- Scheme Design for Continuous Flow Class Ⅳ Standard Upgrading Using MBBR Process in a WWTP with CASS Process in Sichuan
- 摘要:
- 四川某10×104 m3/d的CASS工艺污水厂需进行地表水准Ⅳ类提标改造，面临进水负荷及出水水质同步提升问题。为此重新校核了进水水质，采用MBBR工艺强化系统处理负荷，将原CASS池划分为MBBR生化池和沉淀池，改造D型滤池为砂滤池，并新建深床滤池。改造后，出水水质稳定优于地表水准Ⅳ类水，且抗冲击能力显著加强，出水氨氮、总氮、总磷分别达到（0.53±0.30）、（6.70±1.40）、（0.20±0.05） mg/L；吨水及吨污染物处理能耗分别增加10%和4%，吨水碳源投加量增加15%，吨污染物碳源消耗量下降8%。针对硝化，该系统仍具备20%的水质提升及10%的水量提升潜力，可进一步扩容或应对进水水质可能增加的风险。实践证明，MBBR可满足较大范围的提标或扩容需求，其集约、高效、抗冲击等优势显著。
- Abstract:
- A wastewater treatment plant (WWTP) using CASS process with a capacity of 10×104 m3/d in Sichuan required upgrading to meet quasi-Ⅳ standards which is facing the problem of simultaneous improving influent loading and effluent quality. For this reason, the influent quality was checked again, and the moving bed biofilm reactor (MBBR) process was used to enhance treatment capacity, the original CASS tank was divised into a MBBR biochemical tank and a sedimentation tank, the D-type filter was transformed into a sand filter, and a new deep-filter was built. After the renovation, the effluent quality was stable and better than the quasi-Ⅳ standards, and the impact resistance was significantly enhanced. The effluent concentrations of ammonia nitrogen, total nitrogen, and total phosphorus were reduced to （0.53±0.30） mg/L, (6.70±1.40) mg/L and (0.20±0.05) mg/L, respectively. The energy consumption per ton of water and per ton of pollutants only increased by 10% and 4%, respectively. The added carbon source per ton of water increased by 15%, while carbon source consumption per ton of pollutants decreased by 8%. For nitrification, the system retains the capacity for a 20% improvement in influent quality and a 10% increase in treatment volume, enabling future expansion or adaption to higher influent loads. This case study demonstrates that the MBBR technology can meet a large range of upgrading or expansion needs, with significant advantages such as intensification, efficiency, and shock resistance.
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