GAOWei-nan,TIANMeng,LIWei,et al.Discussion on Design of Wastewater Treatment Plant with High Concentration Wastewater in a Long?term Low Temperature Region[J].China Water & Wastewater,2025,41(4):62-68.
长期低温高水质浓度污水处理厂设计探讨
- Title:
- Discussion on Design of Wastewater Treatment Plant with High Concentration Wastewater in a Long?term Low Temperature Region
- Keywords:
- wastewater treatment plant; severe cold region; multi-stage A2/O; ultrafiltration membrane; denitrifying deep bed filter; hydrolytic acidification; BioWin software
- 摘要:
- 为缓解区域污水处理压力，某高寒地区新建一座污水处理厂，设计规模2.0×104 m3/d，设计出水水质执行《城镇污水处理厂污染物排放标准》（GB 18918—2002）一级A标准。该污水处理厂面临长期低温、进水浓度高、出水回用稳定性要求高等难题，采用水解酸化+多段A2/O生物池+二沉池+混凝沉淀+反硝化深床滤池+超滤膜的工艺路线，实现了污水的达标处理和稳定回用；通过为水解酸化单元及超滤膜单元设置超越条件，提高污水处理厂的运营灵活性，降低了运行费用。结果表明，经过该组合工艺处理后，各出水指标稳定达标，在冬季依然具有良好的运行效果，且超滤膜多数时间处于超越工况。该工程概算总投资约27 493.20万元，处理成本为5.28元/m3，该工艺路线及措施可为类似工程设计提供参考。
- Abstract:
- To alleviate the pressure of regional wastewater treatment, a new wastewater treatment plant with a design capacity of 2.0×104 m3/d was built in a severe cold region, and the effluent quality need to meet the first level A limit specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). Confronted with the challenges of long-term low temperatures, elevated influent concentrations, and stringent effluent stability requirements for reuse, the wastewater treatment plant implemented a process comprising hydrolytic acidification, multi-stage A2/O bioreactor, secondary sedimentation tank, coagulation-sedimentation tank, denitrifying deep bed filter, and ultrafiltration to meet the discharge standard and achieve consistent reuse of wastewater. By establishing crossover conditions for the hydrolytic acidification unit and the ultrafiltration unit, the operational flexibility of the wastewater treatment plant was enhanced, leading to a reduction in operating costs. After the combined process treatment, each effluent parameter consistently met the discharge standard. The operational performance remained effective even in winter, and the ultrafiltration remained inactive for the majority of the time. The total estimated investment for the project is approximately 274.932 million yuan, with a unit wastewater treatment cost of 5.28 yuan/m3. The process route and measures outlined can serve as a reference for similar engineering design.
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