净水技术2023，Vol.42Issue(12)：52-62,11.DOI:10.15890/j.cnki.jsjs.2023.12.007
水厂尾水处理系统浓缩池上清液回用对PFASs的富集
Supernatant Recycling for PFASs Enrichment in Thickening Tank of Tailwater Treatment System in WTP
摘要
Abstract
Perfluoroalkyl and polyfluoroalkyl substances(PFASs)exhibit cumulative properties,and their long-term enrichment effects cannot be ignored.The supernatant from thickening tank plays a crucial role in the tailwater treatment system,and its responsible recycling is vital for sustainable water resource management.This paper constructed pilot test equipment to facilitate the continuous direct recycling of the supernatant from thickening tank of tailwater system in WTP.The primary aim was to explore the potential enrichment risk of PFASs in the water treatment process and to assess the feasibility of safe supernatant recycling.The results revealed that the total concentration of total PFASs in the supernatant of the thickening tank ranges was from 14.6 ng/L to 36.0 ng/L,with an average concentration of 27.3 ng/L.This was consistent with the composition characteristics of PFASs found in raw water sourced from the Yangtze River,and the content of total PFASs was superior to that of raw water in most cases.During the 15 days pilot test period,the direct recycling of supernatant did not significantly alter the total PFASs concentration in sludge discharge water and carbon sand filter column backwashing water.The total PFASs concentration in the effluent after recycling ranged from 2.2 ng/L to 3.6 ng/L,while it was 3.1 ng/L before reuse.Continuous direct recycling of the supernatant had minimal impact on PFASs components in the outflow,and no significant enrichment occurred;it even demonstrated the potential for improving effluent quality.The health risk of PFASs in the effluent was negligible.In conclusion,using PFASs as the risk control index,the continuous direct recycling of the supernatant from the thickening tank is deemed feasible.关键词
尾水处理系统/浓缩池上清液/全氟和多氟烷基物质/连续直接回用/富集风险/水厂Key words
tailwater treatment system/supernatant of thickening tank/perfluoroalkyl and polyfluoroalkyl substances(PFASs)/continuous direct recycling/enrichment risk/water treatment plant(WTP)分类
土木建筑引用本文复制引用
司佳蕾,祖振权,鲍寻,陈晗,林涛..水厂尾水处理系统浓缩池上清液回用对PFASs的富集[J].净水技术,2023,42(12):52-62,11.基金项目
国家重点研发计划:定向去除抗生素等的氧化-生物协同技术研发与示范(2022YFC3203702) （2022YFC3203702）
