CAI Xiao-nan,LIU Hong-yuan,ZHU Hai-tao,et al.Treatment of Micro-polluted River Water by Nanofiltration Membrane[J].China Water & Wastewater,2021,37(9 9):27-32.
Treatment of Micro-polluted River Water by Nanofiltration Membrane
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
9 9
Page:
27-32
Column:
Date of publication:
2021-05-01
- Abstract:
- In view of the contradiction between organic matter and ammonia nitrogen pollution of river water and demand of continuous improvement of drinking water quality in Jiaxing area, a pilot-scale nanofiltration system with treatment capacity of 1.50 m3/h was carried out. When water temperature, operating pressure and recovery rate were 4-33 ℃, 0.30-0.70 MPa and 83.0%, the removal rates of UV254, CODMn and DOC in the nanofiltration system were all more than 88.0%, and UV254, CODMn and DOC in the effluent decreased to less than 0.009 cm-1, 0.50 mg/L and 0.50 mg/L, respectively. When ammonia nitrogen in the influent was 0.43-2.47 mg/L, the effluent ammonia nitrogen was 0.12-0.54 mg/L with the average removal rate of 82.3%. Sixteen kinds of disinfection byproducts stipulated in Standards for Drinking Water Quality (GB 5749-2006) were not detected in the effluent from nanofiltration system, and fluorescent materials were almost completely removed. Compared with the effluent quality of ozone/activated carbon process operated in the same period, the formation potentials of trichloromethane, dichloromethane, dichloroacetic acid and trichloroacetic acid in the effluent of nanofiltration system decreased by 78.1%, 86.9%, 50.9% and 59.1%, respectively. When the operating pressure increased from 0.30 MPa to 0.50 MPa, the removal rates of UV254, CODMn, DOC and ammonia nitrogen in nanofiltration system remained basically unchanged. When the reflux ratio increased from 0 to 0.35, the recovery rate of the system increased from 70.9% to 93.0%. The removal rates of UV254, CODMn and DOC by nanofiltration system decreased slightly, but the removal rate of ammonia nitrogen decreased obviously. When the water temperature increased from (10±2) ℃ to (30±2) ℃, the removal rates of CODMn and DOC by nanofiltration system increased slightly. However, low temperature was more conducive to the removal of ammonia nitrogen, but the recovery rate of the system was lower.
Last Update:
2021-05-01