DMDAAC复配改性PFSS处理高砷、镉废水的研究

Modification of PFSS by DMDAAC for Treatment of High Concentrated As and Cd Wastewater

以中高浓度As、Cd废水为处理对象,探讨了二甲基二烯丙基氯化铵(DMDAAC)复配改性聚合硅酸硫酸铁(PFSS)的絮凝性能。PFSS与DMDAAC复配形成稳定的均相复合溶液,当温度为100℃、DMDAAC投加量为200 mL/L、复配时间为5 min时制备的液态复合絮凝剂的絮凝效果最佳。复合絮凝剂在投加量为12.5 mL/L、pH值为8的条件下,能够有效去除废水中的Cd、As,出水中的Cd、As含量满足试验设计要求(Cd≤0.05 mg/L、As≤0.5 mg/L)和《铅、锌工业污染物排放标准》(GB 25466—2010)的要求。FT-IR和SEM检测结果表明,复合絮凝剂是相互融合的复合体系,PFSS改变了DMDAAC所处的化学环境,使其中一些官能团的特征吸收峰发生位移。

For the treatment of medium and high concentrated As and Cd wastewater, the floccula- tion performance of polyferric silicate sulfate （PFSS） modified by dimethyl diallyl ammonium chloride （DMDAAC） was explored. DMDAAC and PFSS were compounded to form a stable homogeneous composite solution. The optimal flocculation effect was achieved by the liquid compound flocculant prepared at temperature of 100℃, DMDAAC dosage of 200 mL/L and compound preparation time of 5 min. With floeculant dosage of 12.5 mL/L and pH value of 8, Cd and As could be effectively removed from wastewater, and the Cd and As content in the effluent met the experimental design requirements （Cd ≤0.05 mg/L and As ≤0.5 mg/L） and the Emission Standard of Pollutants for Lead and Zinc Industry （GB 25466 -2010）. The FT-IR and SEM tests indicated that the compound flocculant was a mutually blended composite system. PFSS changed the chemical environment of DMDAAC and displaced some characteristic absorption peaks of functional groups.