磁混凝工艺处理市政废水中的污染物去除特征研究

本研究对2个磁混凝站点进行了水质分析与溶解性有机物（DOM）的系统表征,考察了市政废水在磁混凝过程中的污染物去除效果与DOM去除特征,分析了强化磁混凝过程关键作用.研究发现：磁混凝可显著去除浊度、悬浮态有机物和磷,2个站点TCOD和TP去除率分别为52.53%/76.78%和64.41%/81.59%.市政废水DOM组成复杂,内源性DOM占比较高,两个站点DOM种类相似,但B站点进水有机物含量略少,且芳香类DOM占比较低.磁混凝对DOM具有显著的去除效果,主要去除高腐殖化程度、芳香性、聚合度、疏水性的大分子有机物,络氨酸类蛋白是主要的去除物质.B站点强化药剂的投加显著提升DOM和氨氮的去除效果,TOC和氨氮的去除率可达40.01%和36.08%,同时磷和TCOD的混凝效果也得到一定强化.本研究揭示了磁混凝过程污染物去除特征,促进了磁混凝过程的理解,为磁混凝在水处理中的推广应用提供了有效支撑.

The pollutants removal in municipal wastewater treatment by magnetic coagulation technology

The water quality and dissolved organic matters (DOM) of the two water plants applied with magnetic coagulation (MC) technology were systematically analyzed, the pollutants removal performance and the feature of DOM were studied, and the key role of MC was analyzed. It was found that turbidity, undissolved organic matters, and phosphorus can be effectively removed, as the remove efficiency of TCOD and TP of the two plants were 52.53%/76.78% and 64.41%/81.59%, respectively. The DOM composition in municipal wastewater was complicated, which was mainly endogenous-derived. The feedwater of plant B has lower organic matters concentration, and the aromatic organic matters showed lower proportion. All kinds of DOM can be reduced by MC process, especially for DOM with high degree of humification, aromaticity, polymerization, hydrophobicity, and molecular weight, especially for tyrosine. The addition of chemicals could significantly enhance the removal efficiency of DOM and ammonia, which was 40.01% and 36.08%. And the coagulation efficiencies for TCOD and phosphorus also increased. This work reveals the feature of pollutants removal in municipal wastewater treatment, promoting the understanding of the MC process, and offer supporting for its application in wastewater treatment.