基于水质投诉溯源的二次供水HACCP体系构建与实践OA

[Objective]In response to the phenomenon that secondary water supply accounts for over 75％of user water quality complaints(including reconstruction systems),this paper aims to analyze the water quality risk links in secondary water supply and propose targeted solutions.[Methods]Taking typical secondary water supply scenarios in Shanghai as research objects,the hazard analysis and critical control points(HACCP)system was adopted.The research was conducted through the following procedures:system composition and process analysis of the secondary water supply link,analysis of major hazard factors and significant risk points,determination of critical control points(CCPs),establishment of control indicators and critical limits,construction of a monitoring system for CCPs and design of corrective measures.[Results]Five key control points affecting water quality were identified,namely:material of pump rooms,environment/material of water tanks(pools),water quality of water tanks(pools),standardization of facility operation and maintenance,and material and surrounding environment of user indoor pipes/faucets.For the four typical water quality complaint cases with the highest proportion of complaints in the secondary water supply process,namely yellowish and turbid water with sediment,objectionable taste/odor,red worms and coloured water,an analysis of the risk causes,key control links and control measures was carried out,and the HACCP implementation path was proposed:establishing real-time turbidity/residual chlorine monitoring thresholds(e.g.turbidity ≤0.5 NTU,residual chlorine ≥0.15 mg/L),and formulating quantitative standards such as controlling the water age of secondary water supply within 24 hours and setting the cleaning cycle of water tanks(reservoirs)to≤180 days.Furthermore,recommendations for the implementation of the HACCP system were put forward:conducting a comprehensive assessment of the current status of secondary water supply,emphasizing the processes preceding secondary water supply links,constructing an intelligent management platform for secondary water supply,improving the multi-departmental collaborative mechanism,and enhancing scientific popularization efforts.[Conclusion]HACCP system provides a standardized control framework for addressing water quality complaints in secondary water supply management and offers robust technical support for the long-term guarantee of terminal water quality.