微砂加重絮凝处理高浊度海水絮凝剂的优选研究

Selection of Flocculant in Highly Turbidity Seawater with Micro-sand Ballasted Floc Technology

为确定Actiflo微砂加重絮凝高效沉淀工艺预处理高浊度海水的最佳絮凝剂。利用微砂加重絮凝处理技术对无机絮凝剂和有机絮凝剂在海水体系中的絮凝处理过程中絮凝效果进行了综合评价。结果表明，当采用PAM作为助凝剂时，使用无机低分子絮凝剂，投剂量较大，而使用无机高分子絮凝剂，投剂量可减半，铁盐的混凝效果明显优于铝盐。当采用骨胶作为助凝剂时，无机低分子絮凝剂投剂量明显低于PAM作为助凝剂时的投剂量，并且相同投剂量下，出水浊度更低。低分子絮凝剂与高分子絮凝剂组配处理海水时，最佳投剂量与絮凝剂种类有关。同时，高分子絮凝剂随着投剂量增大，胶体出现再稳定现象。低分子絮凝剂在最佳投剂量下，骨胶的助凝效果明显优于PAM。

In order to determine the optimum flocculant in pre-treatment of highly turbidity seawater with Actiflo micro-sand ballasted floe high efficiency sedimentation process. Performance evaluation for inorganic and organic flocculants＇ coagulation efficiency in seawater system was made by using micro-sand ballasted floc technology. When using PAM as coagulant aid, compared with the inorganic flocculants, the dosage of inorganic flocculants in seawater purification process was halving, meanwhile, the coagulation effect of ferric salt was better than that of aluminous salt. While, the dosage of inorganic flocculants combined with osseocolla was lower than that of PAM as coagulant aid, moreover, effluent turbidity was even lower in the same dosage of organic flocculants. When organic flocculants combined with inorganic flocculants coagulated seawater, there were relationship with the optimum dosage and the kinds of flocculants. Colloid re-stabilized with the increase of dosage when organic polymer flocculants were used to treat seawater. When inorganic flocculants arrived the optimum dosage, the coagulant performance ofosseocolla was superior to PAM conspicuously.