Membrane Process Efficiency and System Operation of Nanofiltration Drinking Water Plant

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.