纳滤膜处理微污染河网水中试研究  

Treatment of Micro-polluted River Water by Nanofiltration Membrane

作　　者：蔡孝楠 刘宏远[1] 朱海涛 孙海平 张刚 徐振峰 CAI Xiao-nan;LIU Hong-yuan;ZHU Hai-tao;SUN Hai-ping;ZHANG Gang;XU Zhen-feng(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Jiaxing Water Investment Group Co.Ltd.,Jiaxing 314000,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310014 [2]嘉兴市水务集团有限公司,浙江嘉兴314000

出　　处：《中国给水排水》2021年第9期27-32,共6页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07201004)。

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 m^(3)/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UV_(254)、COD_(Mn)和DOC的去除率均在88.0%以上,出水UV_(254)、COD_(Mn)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UV_(254)、COD_(Mn)、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UV_(254)、COD_(Mn)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COD_(Mn)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。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 m^(3)/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 UV_(254),COD_(Mn) and DOC in the nanofiltration system were all more than 88.0%,and UV_(254),COD_(Mn) 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 UV_(254),COD_(Mn),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 UV_(254),COD_(Mn) 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 COD_(Mn) 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.

关 键 词：纳滤膜 微污染河网水 有机物 氨氮 

分 类 号：TU991[建筑科学—市政工程]