Cheng Tao
Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, USA.
J Environ Sci (China). 2005;17(4):535-9.
Unlike natural organic matter(NOM), wastewater organic matter(WWOM) from wastewater treatment plant effluents has not been extensively studied with respect to complexation reactions with heavy metals such as copper or zinc. In this study, organic matter from surface waters and a wastewater treatment plant effluent were concentrated by reverse osmosis (RO) method. The samples were treated in the laboratory to remove trace metals and major cations. The zinc complexing properties of both NOM and the WWOM were studied by square wave anodic stripping voltammetry(SWASV). Experimental data were compared to predictions using the Windermere Humic Aqueous Model (WHAM) Version VI. We found that the zinc binding of WWOM was much stronger than that of NOM and not well predicted by WHAM. This suggests that in natural water bodies that receive wastewater treatment plant effluents the ratio of WWOM to NOM must be taken into account in order to accurately predict free zinc activities.
与天然有机物（NOM）不同，来自污水处理厂出水的废水有机物（WWOM）在与铜或锌等重金属的络合反应方面尚未得到广泛研究。在本研究中，通过反渗透（RO）方法浓缩了地表水和污水处理厂出水中的有机物。对样品进行实验室处理以去除痕量金属和主要阳离子。采用方波阳极溶出伏安法（SWASV）研究了NOM和WWOM的锌络合特性。将实验数据与使用温德米尔腐殖质水模型（WHAM）第六版的预测结果进行了比较。我们发现，WWOM对锌的结合力比NOM强得多，且WHAM对其预测效果不佳。这表明，在接纳污水处理厂出水的天然水体中，为了准确预测游离锌的活性，必须考虑WWOM与NOM的比例。
