摘要
基于吸附的一体式超滤工艺因其占地面积小等优势逐渐受到关注。然而,已有研究多采用粉末活性炭、纳米铁、甚至砂砾石等颗粒型吸附剂,不仅运行过程中存在刮伤膜表面的风险,且缺乏实际运行参数。混凝剂水解絮体松散且吸附效能强,为此,以江苏常州某河流水样为原水,考察了基于絮体吸附的一体式超滤工艺中试运行效能。结果表明,运行过程中滤饼层是引起超滤膜污染的主要原因;相比粉末活性炭(powdered activated carbon,PAC)和铁盐絮体,一体式铝盐絮体-超滤工艺运行效果较差;与PAC相比,松散的絮体使得一体式铁盐-超滤工艺膜表面滤饼层较薄,膜污染负荷较低,缓解膜污染的效果更优;与单独超滤膜处理相比,投加最优剂量的粉末活性炭和铁盐后分别将运行时间延长71.4%和100%;加氯预处理能灭活膜池内微生物,但仅在一定程度上减缓了膜污染。对于出水水质,一体式铁盐絮体-超滤工艺平均出水浊度低于0.1 NTU,出水铁的质量浓度低于国家饮用水水质标准(GB 5749-2006),同时对总有机碳、总磷、氨氮等指标的去除率均有一定程度的提高。
The integrated adsorption-based ultrafiltration(UF)process has attracted much attention due to its small land-occupation.However,granular adsorbents,such as activated carbon,nanoscale-iron,even sand,which were always investigated in previous studies,not only caused the membrane surface damage during filtration,but also lacked the related practical operation parameters.It’s well known that the hydrolyzed flocs are loose and their adsorption ability is strong.Therefore,the pilot-scale performance of the integrated floc-UF process was investigated with the raw water obtained from a river in Changzhou,Jiangsu.The results showed that cake layer was the main fouling mechanism of UF.In comparison with the powder activated carbon(PAC)and iron-based flocs,the aluminum-based floc-UF process performed worse.Owing to the more looseness of flocs compared with powder activated carbon,lower fouling degree occurred with iron-based UF process because of the thinner cake layer and thus lower pollutant load induced on membrane surface.In addition,compared with the UF membrane alone,the operation time increased by 71.4% and 100% after the addition of optimum dosage of powder activated carbon or iron salts.Moreover,although the microorganisms in the membrane tank were inactivated by chlorination pretreatment,the membrane fouling was alleviated to a certain extent.For the effluent quality,the average effluent turbidity of the integrated iron-based-floc-UF process was lower than 0.1 NTU,and the iron concentration was lower than the national standard(GB5749-2006).The removal rates of total organic carbon,total phosphorus and ammonia nitrogen also increased to some extent.
作者
刘岩松
康勇锋
吴思琦
马百文
LIU Yansong;KANG Yongfeng;WU Siqi;MA Baiwen(School of Environment,Northeast Normal University,Changchun 130024,China;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;BCED Environmental Development Co.Ltd.,Beijing 100192,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2021年第6期1887-1893,共7页
Chinese Journal of Environmental Engineering
基金
国家重点研发计划项目(2016YFC0400802)
国家自然科学基金国际(地区)合作与交流项目(51820105011)。
关键词
超滤
絮体
粉末活性炭
一体式工艺
中试
膜污染
ultrafiltration
flocs
PAC
integrated process
pilot-scale
membrane fouling