【摘要】 目前，二次供水系统已成为制约高品质饮用水实现的“最后一公里”瓶颈环节。通过建立住宅小区二次供水系统水力水质模型，探究水龄和余氯在二次供水系统内的一般变化规律，分析影响不同住户饮用水水质的主要因素，基于典型用户探寻水质恶化关键环节，并利用模型对几种水质改善措施的效果进行评价。结果表明，同一小区内不同住户的水质，与其所处用水单元距离泵房的管线距离、入住率和总用水量有关；清晨第一次用水前放水、二次加氯和入住率提高能在一定程度上改善部分用户的水质，而小区室外供水管网成环设计在改善用户水质方面具有不确定性。更多还原

【Abstract】 The secondary water supply system has become one of the bottleneck links in the “last mile” restricting the realization of high-quality drinking water. In this study, a hydraulic water quality model of secondary water supply system in residential districts is established to explore the general variation rules of water age and residual chlorine, from entering the community to users, as well as the influencing factors of drinking water quality of different households in the same community. The effect of several water quality improvement measures are also evaluated based on the model. The results show that the water quality of different households in the same community is negatively correlated with the length of pipeline from water unit to pump house, while positively associated with the occupancy rate and total water consumption of water units. The water quality of some users can be improved to some extent by releasing water before the first use in the morning, secondary chlorination, and increasing the occupancy rate. However, the effect of setting outdoor pipelines of a secondary water supply system as loops on improving user water quality is uncertain.更多还原