半封闭气-水反冲洗接触絮凝过滤处理农村饮用水  

Semi-closed Air-water Backwashing Contact Flocculation Filtration for Treatment of Rural Drinking Water

作　　者：谢丰莹 李爽[1] 张雪娇 周同高 胡璐瑶 陈雪明[1] XIE Feng-ying;LI Shuang;ZHANG Xue-jiao;ZHOU Tong-gao;HU Lu-yao;CHEN Xue-ming(College of Environmental&Resource Sciences,Zhejiang University,Hangzhou 310058,China;Yongkang Water Resources and Water Supply Management Center,Yongkang 321300,China)

机构地区：[1]浙江大学环境与资源学院,浙江杭州310058 [2]永康市水资源供水管理中心,浙江永康321300

出　　处：《中国给水排水》2023年第3期40-46,共7页China Water & Wastewater

基　　金：国家重点研发计划项目(2019YFC0408800)。

摘　　要：南方一些偏远山区由于海拔高、距离远,城镇供水管网难以延伸到位,而单村供水站主要存在浊度难以稳定达标、自用水率高的问题。为此,研发了一种半封闭气-水反冲洗接触絮凝过滤技术以处理农村饮用水,考察了其过滤性能与节水效果,并在浙江省永康市舟山镇舟一村进行应用示范。实验研究结果表明,在原水浊度为20 NTU、PAC投加量为1.5 mg/L、滤速为8 m/h、水温为25℃的条件下过滤28 h,平均出水浊度在0.2 NTU以下;在气冲强度为17 L/(m^(2)·s)、水冲强度为4 L/(m^(2)·s)的条件下进行气-水反冲洗,自用水率为0.96%,较单水反冲洗节约耗水67.2%。实际应用结果表明,运行3个月共计91个周期,平均出水浊度在0.5 NTU以下,过滤器最高允许液位达4~5 m,自用水率为1.37%。Due to the high altitude and long distance in some remote mountainous areas in south China,it is difficult to extend the urban water supply network in place,while the single village water supply station mainly has the problems such as difficulty in stably meeting the turbidity standard and high self-use water consumption rate.Therefore,a semi-closed air-water backwashing contact flocculation filtration technology was developed and applied to rural drinking water treatment.The filtration and water-saving performances were investigated,and a demonstration project was carried out in Zhouyi Village,Zhoushan Town,Yongkang City,Zhejiang Province.The experimental results showed that the average turbidity of the effluent was below 0.2 NTU after filtration for 28 h when the raw water turbidity was 20 NTU,the PAC dosage was 1.5 mg/L,the filtration rate was 8 m/h,and the water temperature was 25℃.When the aeration rate and backwash flow rate of air-water backwashing system were 17 L/(m^(2)·s)and 4 L/(m^(2)·s),respectively,the self-use water consumption rate was 0.96%,and 67.2%of the water consumption was saved compared with that of single water backwashing.The actual application results showed that the average effluent turbidity was less than 0.5 NTU,the maximum allowable liquid level of the filter was 4-5 m,and the self-use water consumption rate was 1.37%.

关 键 词：农村饮用水 半封闭式过滤 气-水反冲洗 接触絮凝 节水 

分 类 号：TU991[建筑科学—市政工程]