TAOHui,CHENYi-yang,JIANGFu-chun,et al.Rejection of Disinfection By-products Precursors by Nanofiltration in Drinking Water Treatment[J].China Water & Wastewater,2023,39(17):38-44.
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Rejection of Disinfection By-products Precursors by Nanofiltration in Drinking Water Treatment

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第17期 Page: 38-44 Column: Date of publication: 2023-09-01
Author(s):
TAO　Hui1; 2;  CHEN　Yi-yang1; 2;  JIANG　Fu-chun3;  ZHANG　Xue3;  LIN　Tao1; 2
（1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes ， Hohai University， Nanjing 210098， China； 2. College of Environment， Hohai University， Nanjing 210098， China； 3. Suzhou Water Supply Co. Ltd.， Suzhou 215002， China）
Keywords:
drinking water;  nanofiltration;  natural organic matter (NOM);  disinfection by? products (DBPs);  trihalomethane;  dichloroacetamide
Abstract:
This paper investigated the performance of NF90 nanofiltration membrane for the rejection of different natural organic matters (NOMs) and disinfection by-products (DBPs) precursors in effluent from sedimentation tank of a water treatment plant in Suzhou. The rejection rates of NOM, trihalomethane formation potential (THMFP) and dichloroacetamide formation potential (DCAcAmFP) in water by nanofiltration were above 67.2%, 84.1% and 52.0%, respectively. Increasing the influent pH decreased the rejection of building blocks (BB) and low molecular weight (LMW) components, and thus resulted in the decrease of the rejection rate of disinfection by-products formation potential (DBPFP). Increasing the influent Ca2+ concentration accelerated the formation of a dense fouling layer on the membrane surface and enhanced the rejection of NOM and THMFP. However, high Ca2+ concentrations enhanced the penetration of positive hydrophilic LMW components and reduced the rejection of DCAcAmFP. Operating pressure had no obvious effect on rejection of NOM and DBPFP. However, the rejection rates of NOM and DBPFP decreased obviously with the increase of recovery rate. Under the experimental operating conditions, the THMs in effluent from NF90 nanofiltration membrane was much lower than the limits specified in Standards for Drinking Water Quality (GB 5749-2006), and the production of DCAcAm was low. For the removal of NOM and DBPFP, the system was suggested to adopt a higher recovery rate to improve the water yield.
Last Update: 2023-09-01