溢流污水中溶解性有机物的混凝去除特性

Characteristic of Dissolved Organic Matter Removal in Overflow Wastewater by Coagulation Flocculation Process

摘要:

以上海市某分流制雨水系统溢流污水中溶解性有机物（DOM）为对象，分析了溢流污水DOM的化学、物理组分以及聚合双酸铝铁（PAFCS）对DOM的混凝去除效果.结果表明，溢流污水DOM中憎水性物质（HoM）和亲水性物质（HiM）质量分数分别为68%和32%左右；分子量大于300 kDa和10～50 kDa的有机物质量分数分别为29.76%和37.87%.PAFCS对总有机碳（TOC）的去除率为17%左右，混凝对HoM的去除率远高于对HiM的；对大于300 kDa和100～300 kDa组分的去除率为20%～25%，而对50～100 kDa以及小于10 kDa的组分基本没有效果.

Abstract:

The fractions variation and the removal efficiency of dissolved organic matter (DOM) by polyaluminum ferric chloride sulfate (PAFCS) in coagulation flocculation process were investigated by taking a storm sewer system in Shanghai for example. The results show that in overflow wastewater, hydrophobic matter (HoM) and hydrophilic matter (HiM) account for 68% and 32% respectively; and molecular weight (MW) more than 300 kDa and 10～50 kDa fractions account for 29.76% and 37.87% respectively. PAFCS is effective on DOM removal and total organic carbon (TOC) removal efficiency is 17% approximately, and the removal efficiency of HoM fraction is higher than HiM fraction. The removal efficiency of MW more than 300 kDa and 100～300 kDa is between 20% and 25% approximately, but the MW less than 10 kDa and 50～100 kDa fractions are rarely removed in coagulation flocculation process.