磁铁砂加载絮凝技术处理低温低浊海水

LOW TEMPERATURE AND TURBIDITY SEAWATER TREATMENT WITH MAGNETIC FLOCCULATION TECHNOLOGY

采用磁铁砂加载絮凝技术处理低温低浊海水。通过混凝杯罐实验,研究探索了絮凝过程的最佳工艺参数,考察对比了磁铁砂加载絮凝与FeCl3混凝的处理效果。结果表明,混凝剂选用FeCl3、投加量为15 mg/L,磁铁砂粒径为75～125μm、投量为40 mg/L,以先投混凝剂、1 min后投加磁铁砂的顺序进行磁铁砂加载絮凝,可有效去除低温低浊海水中的SS、浊度和有机物。在混凝过程中,以磁铁砂为内核形成了紧密的磁性复合絮体,产生了电性中和、静电及磁场吸附作用,发挥了微砂加载絮凝和磁絮凝的双重优势。与FeCl3混凝相比,不仅处理效果提高,而且药耗减少、沉淀时间缩短、沉降絮体体积压缩,极具应用价值。

As an attempt, magnetic flocculation technology was used to treat low temperature and turbidity seawater. By the results of coagulation experiment, the optimum parameters of flocculation process were found, and the treatment effects of magnetic floeculation and ferric chloride （FeCl3） flocculation were compared. Results showed： when coagulant is ferric chloride （FeCl3）, dosage is 15 mg/L, magnetite sand particle size is 75 - 125 microns, dosage is 40 mg/L, dosing order is adding coagulant before magnetic sand and time interval is 1 min, magnetic floeculation can effectively remove SS, turbidity and organics. In the process of coagulation, Magnetic composite floes whose core is magnetite sand were formed, and then the effect of charge neutralization, electrostatic adsorption and magnetic adsorption were exerted, which can give full play to the advantages of the both Actiflo and CoMag. Compared with chloride-ferric chloride （FeCl3） floeculation, magnetic flocculation can not only improve treatment effect, but also reduce drug consumption deposits, Shorten settling time, compress the volume of floes, so it is clear that magnetic floeeulation technology has great value on application.