强化混凝对集中式印染废水中溶解性有机污染物去除研究

Research on the Removal of Dissolved Organic Contaminants by Enhanced Coagulation Process in Centralized Printing and Dyeing Wastewater

对某印染集中污水处理厂调节池出水进行强化混凝,探究Al_2(SO_4)_3、PFS、FeCl_3、PAC、FeSO_4和MgCl_2等混凝剂对不同相对分子质量的溶解性有机污染物(DOM)的混凝去除机制,以改善印染废水混凝去除效率,减轻后续生化、深度处理的负担。结果表明,在相对分子质量>100×10~3、3×10~3~<10×10~3、<10~3时,最有效的混凝剂为FeCl_3;相对分子质量在30×10~3~<100×10~3时,最有效的混凝剂为Al_2(SO_4)_3;PFS混凝对相对分子质量在10×10~3~<30×10~3和10~3~<3×10~3的有机物去除效果最好。Al_2(SO_4)_3、PFS、FeCl_33种混凝剂的合理组合使用可能会提高印染废水中DOM的混凝去除效率。

Enhanced coagulation experiments were carried out for the treatment of effluent from equalization basin in a centralized printing and dyeing wastewater treatment plant. The effects ofA12（SO4）3, PFS, FeCl3, PAC, FeSO4, and MgCl2 on the removal mechanisms of dissolved organic pollutants with different relative molecular mass were studied, in order to improve the treatment efficiency of printing and dyeing wastewater by coagulation, as well as reducing the burden on following biochemical and advanced treatments. The results showed that FeC13 was the＇most efficient coagulant for the removal of organic pollutants in the relative molecular mass ranges of 〉100×10^3, 3×10^3-〈10×10^3, and 〈10^3, while the range was 30×10^3-〈100×10^3, the Al2（SO4）3 was the most efficient coagulant, with respect to range of 10×10^3-〈30×10^3 and 103-〈3×10^3, PFS was the most efficient coagulant. The rational combination of Al2（SO,）3, PFS, and FeC13 may improve the coagulation efficiency for the removal of DOM from printing and dyeing wastewater.