沉淀—氧化—氨基酸改性聚硅氧烷-聚合硫酸铝铁增强混凝组合工艺处理冶炼烟气制酸废水研究及工业试验

Research and industrial test on treatment of smelting flue gas acid making wastewater by precipitation-oxidation-amino acid modified polysiloxane polymeric aluminum ferric sulfate enhanced coagulation combined technique

以钾明矾、硫酸亚铁、双氧水和氨基酸改性聚硅氧烷(MPS)为主要原料,采用超声辅助法制备复合混凝剂——氨基酸改性聚硅氧烷-聚合硫酸铝铁(MPSPAFS),研究了MPSPAFS中MPS质量分数和MPSPAFS投加量对冶炼烟气制酸废水处理效果的影响。同时,针对某铅锌冶炼厂冶炼烟气制酸废水深度处理的需求,采用沉淀—氧化—MPSPAFS增强混凝组合工艺技术开展了冶炼烟气制酸废水处理工业试验。结果表明,在MPSPAFS中MPS最佳质量分数(0.3%)、MPSPAFS最佳投加量(80 mg/L)下,对冶炼烟气制酸废水中COD、SS、Cd、Pb、Zn、Ni、Cu、Hg、Cr和As的去除率分别为80.3%、95.1%、88.9%、86.4%、84.7%、83.3%、82.1%、79.5%、38.2%和36.4%。工业试验运行结果表明,系统出水各项指标均达到《铅、锌工业污染物排放标准》(GB 25466—2010)的标准。

Potassium alum,ferrous sulfate,hydrogen peroxide and amino acid modified polysiloxane(MPS)were chosen as the main raw materials,and the complex coagulant(amino acid modified polysiloxane-polymeric aluminum ferric sulfate(MPSPAFS))was prepared by ultrasonic-assisted method.The influence of the mass fraction of MPS in MPSPAFS and the dosage of MPSPAFS on the treatment efficiency of the smelting flue gas acid making wastewater was investigated.In response to the demand for advanced treatment of smelting flue gas acid making wastewater of a lead zinc smelter,an industrial application test of smelting flue gas acid making wastewater was carried out using precipitation-oxidation-MPSPAFS enhanced coagulation combined technique.The results showed that when the optimal mass fraction of MPS in MPSPAFS was 0.3%and the optimal dosage of MPSPAFS was 80 mg/L,the removal rates of COD,SS,Cd,Pb,Zn,Ni,Cu,Hg,Cr and As in smelting flue gas acid making wastewater were 80.3%,95.1%,88.9%,86.4%,84.7%,83.3%,82.1%,79.5%,38.2%and 36.4%,respectively.The industrial test results showed that all indicators of the effluent met the requirement of“Emission standard of pollutants for lead and zinc industry”(GB 25466-2010).