高锰酸钾与壳聚糖联用处理低温低浊水的研究

以哈尔滨磨盘山水库低温低浊期原水为研究对象,以静态烧杯实验为研究方法,根据混凝剂聚合氯化铝(PAC)不同投加量对混凝效果的影响确定其最佳投量,考察高锰酸钾投加量、预氧化时间、投加方式等因素对混凝效果的影响,研究壳聚糖(CTS)投加量、投加方式等因素对其助凝效果的影响,并在单因素分析基础上对高锰酸钾与壳聚糖联用强化混凝的净水效果作进一步研究.结果表明:对于磨盘山水库低温低浊期水质,单纯提高混凝剂的投加量会使浊度升高,也无法持续提高CODMn和UV254的去除率;高锰酸钾预氧化和壳聚糖助凝均具有一定的强化混凝作用,二者联合使用可以进一步提高对低温低浊水中有机物的去除效果,使CODMn和UV254的去除率较常规工艺提高10%左右.

Treatment of low temperature and low turbidity water with the combination of potassium permanganate and chitosan

With the raw water of low temperature and low turbidity in Harbin Mopanshan reservoir as the study object,lab-scale tests are carried out to investigate the influence of PAC dosage on the efficiency of coagulation and to get the optimal dosage.The influences of potassium permanganate dosage,the preoxidation time and its adding way on the efficiency of coagulation are investigated,as well as the influence of the dosage and adding method of CTS on the efficiency of coagulation aid.In addition,the effect of combining potassiums permanganate and CTS on the enhanced coagulation of water is further studied.The experimental results indicate that,for low temperature and low turbidity water,the sole increasement of coagulant dosage will aggravate turbidity and can not improve the removal rate of CODMn or UV254,both potassium permanganate and chitosan can enhance coagulation,while their proper combination performs better in the removal of the organic matter,with the removal rate of CODMn and UV254 significantly rising by 10% compared with that of the convientional treatment.