复合混凝剂(PFC-PDMDAAC)混凝性能与应用研究  

Coagulating mechanisms and practical applications of a composite coagulant( PFC-PDMDAAC)

作　　者：任宏洋[1] 何敏[1] 王兵[1] 张聪[1] 

机构地区：[1]西南石油大学化学化工学院,成都610500

出　　处：《环境工程学报》2016年第4期1761-1768,共8页Chinese Journal of Environmental Engineering

基　　金：国家科技支撑计划(2011BAC06B05)

摘　　要：以聚合氯化铁（PFC）和聚二甲基二烯丙基氯化铵（PDMDAAC）为原料制备PFC-PDMDAAC无机-有机复合混凝剂。考察PDMDAAC/Fe质量比（P）及PDMDAAC分子质量分别对混凝剂电荷特性与Fe（Ⅲ）形态分布的影响,并优选复合混凝剂应用于石油开发中钻井废水的处理。结果表明,复合混凝剂Zeta电位随复合质量比（P）及PDMDAAC分子质量增加而增大。随着P增加复合混凝剂中Feb含量增大,当PDMDAAC分子质量为400 000～500 000时,混凝剂中铁的有效形态含量最高,在一定程度上提高复合质量比及有机物分子质量均能提高混凝效率。在优选混凝剂应用处理油田钻井废水实验中,质量比（P）大且PDMDAAC分子质量高的编号为f的复合混凝剂表现出较优的混凝效能,这与混凝性能研究结果相一致。应用响应曲面法优化编号为f的混凝剂处理油田钻井废水混凝条件的结果为,投加量1 679.73 mg/L,p H=9.7。在最优条件下进行验证实验,COD去除率达71.190%,TOC去除率达77.527%,与工业级PAC、PFC处理油田钻井废水效果相比优势较明显。Iron（ III） chloride（ Fe Cl3） and poly dimethyl diallyl ammonium chloride（ PDMDAAC） were applied as raw materials to prepare a novel inorganic-organic coagulant（ PFC-PDMDAAC）. Impacts of different Fe / PDMDAAC mass ratios（ P） and the molecular weight of PDMDAAC on the zeta potential and the Fe speciation were examined. The superior composite coagulant was selected based on oilfield-drilling wastewater treatment performance,and results indicated intensive interactions between PFC and PDMDAAC in the composite PFC-PDMDAAC. The Zeta potential of PFC-PDMDAAC incremented with the increasing P and molecular weight of PDMDAAC. The amount of Fe_b increased with a higher P,while the optimum molecular weight of PDMDAAC was found to be from 400 000 to 500 000. In jar tests for selecting the preferable composite coagulant,the chosen composite coagulant No. f with a higher P and a larger molecular weight showed better performance,which was consistent with theoretical coagulation performance analysis. In addition,response surface methodology（ RSM）was applied to evaluate the effects of the interactions between two parameters,p H and coagulant No. f dosage,on the chemical oxygen demand（ COD） and total organic carbon（ TOC） removal rates in drilling wastewater treatment. Under conditions of a 1 679. 73 mg / L dosage and a p H of 9. 7 suggested by model optimization,the COD and TOC removal rates could reach 71. 190% and 77. 527%,respectively,thereby exceeding popular industrial methods such as PAC and PFC.

关 键 词：复合混凝剂 ZETA电位 响应曲面法 

分 类 号：X703.1[环境科学与工程—环境工程]