纳滤饮用水厂的膜工艺处理效能与系统运行

Membrane Process Efficiency and System Operation of Nanofiltration Drinking Water Plant

摘要:

以国内投产最大规模的纳滤水厂为研究对象 ，针对“常规工艺+超滤+纳滤”的深度处理工艺，结合水厂运行实况、进行水质分析和工艺处理效能研究。研究表明纳滤工艺可有效去除原水中的类腐殖酸和类富里酸物质等有机物，对原水中溶解性有机碳去除率达到82%。三卤甲烷类消毒副产物（THMs-DBPs）生成势实验显示纳滤出水THMs-DBPs浓度为14.45~18.65 μg·L^-1，双膜法工艺出水DBPs前体物浓度极低。根据水厂纳滤单元的日常监测维护，包括进水水质监测、纳滤单元压力变化、膜清洗策略调整，讨论了纳滤膜饮用水厂的系统运维实践。研究结果可为纳滤膜在饮用水处理应用与推广提供技术参考。

关键词:纳滤膜;饮用水;水质;深度处理

Abstract:

This paper focused on the treatment process of "conventional process-ultrafiltration-nanofiltration （NF）" in the largest-scale NF water plant in China as the research object， and considered water plant operation， water quality analysis and process treatment efficiency comprehensively. The result indicated that the NF process effectively removed humic acid-like and fulvic acid-like substances with a removal rate of about 82% for dissolved organic carbon in raw water. The experiment of trihalomethane disinfection by-products （THMs-DBPs） formation potential showed that the 14.45~18.65 μg·L^-1 of THMs-DBPs concentration in NF permeated water meant an extremely low concentration of DBPs precursor for the water treated by the dual-membrane process. Based on the daily monitoring and maintenance of the NF system， including inlet water quality， pressure changes and the adjustment of membrane cleaning strategies， the practice experience of the NF membrane water plant was discussed. The research provided technical references for the application of NF membranes in drinking water treatment.

Key words:nanofiltration membrane;drinking water;water quality;advanced treatment