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):27-32.
纳滤膜处理微污染河网水中试研究
- Title:
- Treatment of Micro-polluted River Water by Nanofiltration Membrane
- 摘要:
- 针对嘉兴地区河网水受有机物和氨氮污染，与饮用水水质需求不断提升之间的矛盾，开展了规模为1.50 m3/h的纳滤系统中试研究。结果表明，在水温为4~33 ℃、操作压力为0.30~0.70 MPa、系统回收率为83.0%的条件下，纳滤系统对UV254、CODMn和DOC的去除率均在88.0%以上，出水UV254、CODMn和DOC分别降至0.009 cm-1、0.50 mg/L和0.50 mg/L以下；当进水氨氮浓度为0.43~2.47 mg/L时，出水氨氮浓度为0.12~0.54 mg/L，平均去除率为82.3%；纳滤系统出水中未检出《生活饮用水卫生标准》（GB 5749—2006）规定的16种消毒副产物，并且荧光性物质几乎被完全去除。与同期试验的臭氧/活性炭工艺出水相比，纳滤系统出水中三氯甲烷、二氯一溴甲烷、二氯乙酸和三氯乙酸生成势分别降低了78.1%、86.9%、50.9%和59.1%。当操作压力从0.30 MPa增大至0.50 MPa时，纳滤系统对UV254、CODMn、DOC和氨氮的去除率基本保持不变；当回流比从0增大至0.35时，系统回收率从70.9%上升至93.0%，纳滤系统对UV254、CODMn和DOC的去除率略有下降，但对氨氮的去除率下降明显；当水温从（10±2） ℃升高至（30±2） ℃时，纳滤系统对CODMn和DOC的去除率略有提高，然而低温更有利于氨氮的去除，但系统回收率较低。
- 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.
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