水合MnO_2对低温低浊水处理效能及残余铝的影响

Efficiency of Low-Temperature and Low-Turbidity Water Treatment with Hydrous Manganese Dioxide and Its Influence on Residual Aluminum

通过烧杯混凝试验分别考察了低温低浊水中聚合氯化铝(PAC)与水合MnO2的除浊去污效果,研究了PAC与水合MnO2联用的混凝效果以及对水中残余铝的影响,结果表明低温低浊水中PAC虽对溶解性有机物(DOM)有一定的去除效果,但最大浊度去除率仅为30.63%,并伴有水中残余铝大幅上升趋势。单独使用水合MnO2将会导致水中浊度升高,但对溶解性有机碳(DOC)与UV254去除率可达17.78%和6.9%。PAC与水合MnO2联用能够有效降低沉后水浊度(最大去除率为61.9%),并降低水中DOC,其最大去除率达23.05%,且使水中胶体铝与溶解性铝的浓度得到降低。

In this paper, the decontamination performance was investigated with polyaluminum chloride （PAC） and hydrous MnO2 respectively in low-temperature and low-turbidity water by the bench-scales tests. The combined influence of PAC and MnO2 on both coagulation effect and residual aluminum removal in water was also studied. The results show though PAC can remove a certain amount of dissolved organic matter （DOM） in low-temperature and low-turbidity water, the maximum removal rate of turbidity is only about 30.63 % and residual aluminum increases obviously in water. Additionally, using hydrous MnO2 alone can lead to the increase of water turbidity, but it improves the removal rates of DOC and UV~ to 17.78 % and 6.9 %, respectively. By combining PAC with hydrous MnO2, turbidity is reduced efficiently, the maximum removal rate of which is 61.9 %, and the content of DOC is also reduced, the maximum removal rate of which is 23.05 %. On the other hand, lower concentrations of colloidal aluminum and dissolved alu- minum are achieved