【摘要】 以天然蛭石为原料,使用硫酸改性天然蛭石,制备无机矿物材料絮凝剂,并且与传统PFS进行对比,研究了不同浓度硫酸改性蛭石絮凝剂的絮凝效果以及对养殖废水中磷去除的影响.研究结果表明:经过质量分数为25%的硫酸溶液改性后,絮凝剂具有更好的絮凝效果,其絮凝效果是由蛭石絮凝剂中的可溶态物质和颗粒态物质协同作用的结果,单独颗粒态物质不具有絮凝作用.蛭石絮凝剂、可溶态物质和颗粒态物质对模拟合成废水中磷的去除率分别为99.0%、97.6%和7.4%.絮凝反应后,6 g/L改性蛭石絮凝剂对250 m L养殖废水中磷的去除率达到95.8%,其效果几乎与PFS投加量在2 g/L时的相同,但蛭石絮凝剂的絮体沉降体积只占整个体积的24%,而传统的PFS的絮体沉降体积却高达64%,是蛭石絮凝剂絮体体积的2.7倍.因此,改性蛭石絮凝剂是一种很好的无机矿物材料絮凝剂,具有广阔的应用前景.更多还原

【Abstract】 Flocculant,an inorganic mineral material,was prepared by modifying natural vermiculite with different concentrations of sulfuric acid. The flocculation effect and phosphorus removal by the modified vermiculite flocculant were studied by comparing it with traditional polymerized ferrous sulfate(PFS). Experiments show that the vermiculite flocculant modified with 25% sulfuric acid has a better flocculation effect. The flocculation function is mainly resulted from the synergistic effect of vermiculite flocculant,soluble substances and particulate matter,and no flocculation effect is found when only individual particulate matter exists. The phosphorus removal efficiencies of synthetic wastewater by the vermiculite flocculant,soluble matter and particulate matter arrive at 99.0%,97.6% and 7.4%,respectively. After flocculation reaction with 6 g/L modified vermiculite flocculant,the phosphorus removal efficiency in 250 mL livestock wastewater reaches 95.8%,which is close to that of 2 g/L PFS. But the volume of vermiculite floc accounts for about 24% of the total volume,while the volume of traditional PFS floc is up to 64%,being 2.7 times as large as that of modified vermiculite. Therefore,the acid modified vermiculite flocculant is assumed to be a very promising inorganic mineral material flocculant with broad application prospects.更多还原