摘要
采用树脂分级将二沉池出水有机物(effluent organic matter, EfOM)根据官能团分类,采用红外光谱、荧光光谱、排阻色谱等多种表征方式对EfOM及其分级组成的化学组成进行分析。考察了EfOM及其分级组成的膜通量随时间的变化曲线,研究了二沉池出水主要的膜污染组分以及膜污染模型机理。结果表明,憎水性有机物组分(hydrophobic, HPO)主要为芳香烃类有机酸,胶体有机物组分(organic colloidal, OC)主要为蛋白质类有机物,过渡亲水性有机物组分(transphilic,TPI)主要是有机酸和多糖。膜污染严重程度依次为OC>EfOM>HPO>TPI,在过滤初期,OC和EfOM中的大分子有机物会快速堵塞膜孔并引起膜通量的剧烈下降。另外,OC和TPI组分会与膜表面发生相互作用,导致不可逆膜污染偏高。对于实际水体EfOM及其各分级组分,滤饼层过滤是超滤后期主要膜污染机理,超滤实验初期的膜污染可能是多种膜污染机理共同作用的结果。研究识别了EfOM的主要污染成分和主要膜污染机理,为超滤工艺深度处理二沉池出水提供了理论指导。
Effluent organic matter(EfOM)was fractioned by resin according to the functional group,and the chemical compositions of EfOM and its fractional components were analyzed by infrared spectrum,fluorescence spectrum and size exclusion chromatography.The variation curve of membrane flux with the time was investigated,and the main components and mechanism of membrane fouling were also studied.The results showed that the hydrophobic(HPO)fraction was mainly aromatic hydrocarbon organic acids,the organic matters in colloidal organic(OC)fraction were mainly biological protein,and transphilic(TPI)fraction mainly consist of organic acids as well as polysaccharides from the biological cell wall.Severity of membrane pollution was in the order:OC>EfOM>HPO>TPI.At the initial stage of membrane filtration,the size and crosslinking ability of macromolecular organic matter in OC and EfOM can cause significant pore blocking and decline of membrane flux.Due to the interactions between OC or TPI fractions and the membrane surface,the proportion of the irreversible membrane fouling was high.For EfOM and its fractions,cake layer filtration was the main fouling mechanism at the later stage of ultrafiltration,while at the initial stage of ultrafiltration,a combination of different membrane fouling mechanisms could contribute to membrane fouling.This study revealed the main pollution components and membrane fouling mechanism,and provided a theoretical guidance for advanced treatment of secondary effluent with ultrafiltration.
作者
熊雪君
徐慧
吴晓晖
贺昶
章北平
王东升
XIONG Xuejun;XU Hui;WU Xiaohui;HE Chang;ZHANG Beiping;WANG Dongsheng(School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2019年第6期1272-1281,共10页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51338010,51608515,21677156)
华中科技大学自主创新研究基金资助项目(2016YXMS284)
关键词
二沉池出水
树脂分级
超滤
可逆膜污染
Hermia膜污染模型
secondary effluent
resin fractionation
ultrafiltration
reversible membrane fouling
Hermia fouling model
