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用粉煤灰酸活化后过滤得到的滤液对壳聚糖进行改性,制备一种新型絮凝剂。用该絮凝剂对上海市和平公园、松鹤公园、鲁迅公园、彰武路某河的景观水体进行处理研究,并采用高锰酸钾预氧化,加强絮凝效果。结果表明,改性后的壳聚糖除浊、除藻效果很好,较少用量(0.6mg·L-1)可获得90%去除率。高锰酸钾预氧化强化了絮凝效果,当高锰酸钾投加量为1mg·L-1时,改性壳聚糖的投加量大大减少(0.3mg·L-1),藻去除率同比提高了近30%,但过高的投加量浊度去除率反而下降。
Activated with fly ash acidified filtrate obtained after the chitosan modified to prepare a new flocculant. Using this flocculant, the landscape water bodies of Shanghai Heping Park, Songhe Park, Luxun Park and Zhangwu Road were treated and pre-oxidized with potassium permanganate to enhance the flocculation effect. The results showed that the modified chitosan had good effect of removing algae and removal rate of 90% with less dosage (0.6mg · L-1). The pre-oxidation of potassium permanganate enhanced the flocculation effect. When potassium permanganate dosage was 1 mg · L-1, the dosage of modified chitosan was greatly reduced (0.3 mg · L-1) An increase of nearly 30% over the same period, but too high dosage turbidity removal rate decreased.