渤海湾近岸海水中溶解性有机物分布分极特性研究

Study on Distribution and Polarity Characteristics of Dissolved Organic Matters in Coastal Waters of Bohai Bay

采用超滤膜法和离子吸附法将渤海湾近岸海水中溶解性有机物分离为7种不同相对分子量组分和3种不同极性组分。实验结果表明:渤海湾近岸海水中以相对分子量<1 kDa的有机物为主,占比为74.5%;分子量在(1 kDa~3 kDa)、(3 kDa~5 kDa)、(5 kDa~10 kDa)、(10 kDa~30 kDa)、(30 kDa~100 kDa)和(100 kDa~0.45μm)的溶解性有机物所占百分比分别为3.9%、7.8%、2%、0.3%、2%和9.5%。不同极性有机物含量由高到低依次为亲水性、强疏水性及弱疏水性,所占比例分别为65%、26%和9%。该研究结果将对减缓海水淡化中超滤膜污染压力提供一定借鉴和经验参考。

The dissolved organic matters of seawater near Bohai Bay were separated into Seven components with different molecular weight and three components with different polarity by ultra-filtration membrane and ion-exchange resins.The results showed that the fraction of molecular weight less than 1 kDa had the largest proportion,which occupied 74.5%in coastal waters of Bohai Bay.And the molecular weight of(1 kDa~3 kDa),(3 kDa~5 kDa),(5 kDa~10 kDa),(10 kDa~30 kDa),(30 kDa~100 kDa)and(100 kDa~0.45μm)occupied 3.9%,7.8%,2%,0.3%,2%and 9.5%,respectively.The contents of organics with different polarity from high content to low content were the hydrophilic component,the strongly hydrophobic component and the weakly hydrophobic component,which accounted for 65%,26%and 9%,respectively.The results of this study will provide some references and experiences for reducing the pollution of ultra-filtration membrane in seawater desalination.