WANGSi-qi,WANGWei-min,ZHANGTao,et al.Pilot Study on the Performance of Nanofiltration Membranes for Treating Surface Water with High Hardness and Alkalinity in Northern Jiangsu[J].China Water & Wastewater,2024,40(19):25-30.
Pilot Study on the Performance of Nanofiltration Membranes for Treating Surface Water with High Hardness and Alkalinity in Northern Jiangsu
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第19期
Page:
25-30
Column:
Date of publication:
2024-10-01
- Abstract:
- In order to explore the water treatment efficiency of ultrafiltration-nanofiltration combined process in a water treatment plant in northern Jiangsu, a pilot study was carried out on the performance of nanofiltration membranes. The basic performance requirements of nanofiltration membranes were determined, and the performance differences of several different commercial nanofiltration membranes were explored. The results showed that the operating pressure (0.33 MPa) of the dense nanofiltration membrane (N2) was nearly double that of the loose nanofiltration membrane (N1) at temperature of about 30 ℃, the flux of 20 L/（m2·h） and the recovery rate of 30%, but the desalination rate of the N2 membrane (95%) was significantly higher than that of N1 (40%), along with better removal effects for hardness and alkalinity. In order to solve the scaling problem of boiling water, the water plant should adopt the dense nanofiltration membrane. When the removal rate of hardness and alkalinity of the nanofiltration membrane reaches more than 90% and 80% respectively, the equally blended produced water from ultrafiltration and nanofiltration could prevent scaling during boiling. Parallel tests of a variety of nanofiltration membranes showed that the removal effect of E membrane for organic matter, hardness and alkalinity was similar to that of N2 membrane, along with a lower operating pressure, which has obvious advantages in treating water with high hardness and high alkalinity.
Last Update:
2024-10-01