无机-有机复合絮凝剂净化海水的试验

Experimental study on purification of seawater by inorganic-organic composite flocculant

在海水净化过程中,絮凝是重要的中间环节,絮凝剂的品质在海水絮凝过程中起着决定作用。以Fe2(SO4)3与二甲基二烯丙基氯化铵(PDMDAAC)为原料,制备出新型无机-有机复合絮凝剂Fe2(SO4)3-PDMDAAC,用来净化渤海近岸海水,通过与单纯投加Fe2(SO4)3无机絮凝剂对比,考察对海水中污染物的去除效果。借助Turbiscan Lab分散稳定性分析仪,研究絮凝剂对海水体系动态稳定性的影响。结果表明:与Fe2(SO4)3相比,Fe2(SO4)3-PDMDAAC复合絮凝剂对海水中浊度、CODMn、TP的去除效果均有一定程度的提高,最高去除率分别为95.2%、51.6%和70.4%。通过监测海水悬浮液动态沉降过程,验证了光学评价方法可行性,并从海水稳定性角度为絮凝机理分析提供了理论依据。

In the seawater purification process,flocculation is a important intermediate link. The quality of flocculant plays a decisive role in the process. In this paper,Fe2（ SO4）3and PDMDAAC was used as raw materials to prepare for inorganic-organic composite flocculants Fe2（ SO4）3-PDMDAAC. By using two kinds of fiber filter material,such as fiber ball and comet fiber filter,the application effect of fiber filtering in the seawater filtration process were investigated. Through comparing individual addition of inorganic flocculant Fe2（ SO4）3,the effects of composite flocculants on the removal efficiency of seawater pollutants were investigated. By means of Turbiscan Lab analyzer,the effect of flocculants on the stability of seawater was evaluated. The results showed that the inorganic-organic composite flocculant Fe2（ SO4）3-PDMDAAC has better removal effect than Fe2（ SO4）3for polluted seawater. The highest removal rates for turbid,CODMn,TP are 95. 2%,51. 6% and 70. 4%. By monitoring the dynamic sedimentation process of seawater suspension with time,it also verified the feasibility of the optical evaluation method. This provides theoretical basis for the mechanism analysis of flocculation from the view of seawater stability.