PAC/PDM复合混凝剂对模拟印染废水混凝脱色效果研究

Study on the Coagulation Decolorization Effect of the Simulated Dyeing Wastewater Treated by PAC/PDM Composite Coagulant

采用混凝烧杯实验,以脱色率和CODMn去除率为指标,研究特征黏度(0.63 dL/g、1.53 dL/g、2.63 dL/g)及复配比例(15:1、10:1、5:1)系列化的复合混凝剂PAC/PDM对模拟印染废水的混凝脱色效果和机理。结果表明,PAC/PDM具有良好的混凝脱色效果。其中,PAC/PDM(2.63/10:1)对活性红、活性蓝的混凝脱色效果最好,其最佳脱色率分别为98.67%、90.83%,最佳CODMn去除率分别为86.44%、80.79%;PAC/PDM(0.63/15:1)对分散红、分散深蓝的混凝脱色效果最好,其最佳脱色率分别为99.30%、99.18%,最佳CODMn去除率分别为86.49%、86.41%。结合Zeta电位测定及絮团形貌观察,PAC/PDM处理模拟印染废水的混凝机理主要是电中和吸附架桥。

Through the coagulation beaker test,taking the decolorization rate and CODMn removal rate as the indexes,the study on the coagulation decolorization effect and mechanism using composite coagulant PAC/PDM with serial intrinsic viscosities(0.63 dL/g,1.53 dL/g,2.63 dL/g)and composite ratios(15:1,10:1,5:1).The results showed that PAC/PDM had good coagulation decolorization effect.PAC/PDM(2.63/10:1)had the best coagulation decolorization effect on reactive red and reactive blue with the best decolorization rates of 98.67%and 90.83%,and the best CODMn removal rates of 88.29%and 82.27%.PAC/PDM(0.63/15:1)had the best coagulation decolorization effect on disperse red and disperse deep blue with the best decolorization rates of 99.30%and 99.18%,and the best CODMn removal rates of 88.57%and 87.85%.Combined with Zeta potential measurement and floc morphology observation,the coagulation mechanism of PAC/PDM treating simulated dyeing wastewater was mainly charge neutralization and adsorption bridging.