颗粒活性炭吸附去除黄浦江原水中有机物的研究

采用超滤膜法分析了黄浦江原水和水厂常规工艺处理出水中有机物的分子质量（MW）分布以及颗粒活性炭（GAC）在不同吸附阶段吸附去除不同分子质量有机物的性能.试验结果表明,黄浦江原水及常规工艺出水中的溶解性有机物（DOC）以小分子为主,并主要集中在MW为10～30 ku和MW＜1 ku的区间;活性炭吸附出水中的溶解性有机物仍然主要集中在小分子区间;吸附初期的活性炭对有机物的去除能力较强,其中对CODMn的去除率＞83%,对UV254的去除率＞90%;随着通水倍数的增大则活性炭的吸附能力逐渐下降,当通水倍数达到6 590.9时,对CODMn和UV254的去除率都只有25%左右;活性炭吸附的各个阶段对小分子有机物的去除率均较高,而对大分子有机物的去除率则较低,从吸附初期到吸附后期,对小分子有机物的去除率高出对大分子有机物的去除率,其百分比从10%增大到30%.

Removal of Organics with Different Molecular Weights from Huangpu River Raw Water by Granular Activated Carbon Adsorption

Variations of molecular weight (MW) distribution of dissolved organics in Huangpu River before and after the conventional process treatment,and the removal efficiencies of the organic matter with different molecular weights during different adsorbing stages by GAC were studied by ultrafiltration membrane technique. The results show that the dissolved organics in Huangpu River before and after the conventional treatment have mainly small molecular weight with 10-30 ku and MW<1 ku; the dissolved organics in the effluent have also mainly small molecular weights. The removal ability of activated carbon adsorption is higher in the beginning, the removal efficiency of COD_ Mn is more than 83%, and that of UV_ 254 is more than 90%. As water flow increases, the adsorption ability falls down gradually, and the removal efficiency of COD_ Mn and UV_ 254 is only about 25% in the last period. The removal efficiency for micromolecular organics is higher than that for macromolecular organics. The difference of removal efficiency between the micromolecular organics and the macromolecular organics increases from 10% to 30% during the experiment.