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以淮河原水为例,研究了3种硅藻土预涂动态膜错流过滤工艺的运行特性及其对原水除浊效果的影响。结果表明,单纯采用硅藻土作为预涂动态膜(硅藻土预涂动态膜错流过滤工艺)进行过滤难以有效降低出水浊度,出水浊度较高(2.86~12.08NTU);投加一定浓度聚合氯化铝进行混凝(硅藻土预涂—聚铝混凝动态膜错流过滤工艺)可使出水浊度降低,但出水时间仍较短;采用硅藻土和粉末活性炭作为预涂剂并投加低浓度聚合氯化铝进行混凝(硅藻土/粉末活性炭预涂—聚铝混凝动态膜错流过滤工艺)可显著改善动态膜纵向层级结构,平均出水浊度低于0.25NTU,且有效出水时间得以延长,其过滤过程更符合标准过滤模型。
Taking the raw water of Huaihe River as an example, the operating characteristics of three kieselguhr pre-coated dynamic membrane cross-flow filtration processes and their effects on turbidity removal efficiency of raw water were studied. The results showed that it was difficult to reduce the effluent turbidity by using pure diatomite as pretreatment dynamic membrane (diatomite pretreatment dynamic membrane cross-flow filtration process), the effluent turbidity was high (2.86 ~ 12.08 NTU) Concentration of PAC for coagulation (diatomite pre-coated - poly aluminum coagulation dynamic membrane cross-flow filtration process) can reduce the effluent turbidity, but the effluent is still short; using diatomite and powdered activated carbon as a pre-coating Agent and adding a low concentration of PAC for coagulation (diatomite / powdered activated carbon precoating - poly aluminum coagulation dynamic membrane cross-flow filtration process) can significantly improve the dynamic film longitudinal hierarchical structure, the average effluent turbidity below 0.25 NTU, and the effective effluent time to be extended, the filtration process more in line with the standard filtration model.