净水技术2025，Vol.44Issue(6)：172-181,10.DOI:10.15890/j.cnki.jsjs.2025.06.021
西北地区某超大型水厂设计关键问题及工艺设计探讨
Key Design Issues and Technological Process Design Discussions of a Large WTP in Northwest Region
摘要
Abstract
[Objective]To address the pollution risks associated with the single water source in Lanzhou City and potential sudden water contamination events,a water source construction project was implemented to ensure urban water supply security.The project focuses on resolving challenges such as raw water characteristics of low temperature and low turbidity in winter,short-term high turbidity in summer,coordination between new and existing water treatment plants,special geological site conditions,optimization of pipeline network compatibility,and emergency response capabilities.[Methods]A large-scale Pengjiaping water treatment plant was constructed with a current capacity of 750 000 m3/d and a future capacity of 1 000 000 m3/d.The treatment process adopted enhanced coagulation+composite sedimentation tank+V-type filter+ultraviolet and sodium hypochlorite combined disinfection.The water treatment room is a multi-functional water treatment structure that integrates multiple functions such as mixing,flocculation,sedimentation,filtration,and backwashing.The sludge treatment room is a superimposed wastewater and sludge treatment structure.Hydraulic simulation is utilized to optimize the velocity gradient and mixer power in the mixing tank.Parameters for backwash blowers are carefully selected,and improvements are made to the baffle installation method and the sludge discharge corridor design in the composite sedimentation tank.Additionally,smart water management systems are integrated.[Results]The project demonstrates that the selected process effectively treated raw water with seasonal variations,achieving stable outflow turbidity below 0.3 NTU year-round.The water treatment plant achieves a highly compact layout,reduces energy consumption,and simplifies operation and maintenance.Enhanced resilience of the water supply system is realized through optimized pipeline network compatibility and emergency measures.[Conclusion]The enhanced coagulation+composite sedimentation tank+V-type filter process proved highly effective in addressing low-temperature,low-turbidity water treatment challenges.The composite sedimentation tank exhibites significant advantages in terms of land occupation,initial investment,operational costs,and shock load resistance.By optimizing process parameters and adopting integrated structure designs,the project reduces energy consumption and land requirements,providing valuable insights for similar engineering applications.关键词
超大型水厂/关键技术问题/工艺设计/复合沉淀池/集成水处理构筑物Key words
large scale WTP/key technical problem/process design/composite sedimentation tank/integrated water treatment structure分类
建筑与水利引用本文复制引用
华海洁,李建,吴倩,杨杰,伍志刚,古建国..西北地区某超大型水厂设计关键问题及工艺设计探讨[J].净水技术,2025,44(6):172-181,10.基金项目
甘肃省科技计划企业研发机构能力建设专项(22CX8JA093) （22CX8JA093）
