论文部分内容阅读
以天然水体中普遍存在的天然有机物腐殖酸(humic acid,HA)为模型污染物,采用PVC合金中空纤维超滤膜去除水中腐殖酸。以腐殖酸去除率和水透过系数作为评价指标,采用响应面法对超滤过程中溶液pH、溶液离子浓度和初始膜通量进行三因素五水平中心组合设计实验,并采用二次回归方程拟合影响因素与响应值之间的函数关系,建立回归方程。结果表明,在腐殖酸的超滤过程中,溶液pH值、溶液离子浓度、初始膜通量对腐殖酸去除率的影响显著性大小为:溶液pH值>溶液离子浓度>初始膜通量,对水透过系数影响显著性大小为:溶液p H值=初始膜通量>溶液离子浓度。腐殖酸去除率和水透过系数方程的调整决定系数Adj.R2分别为为77.10%和88.12%,显著性水平分别为0.001504和0.0001,达到极显著水平,说明方程拟合良好,可用于超滤过程中腐殖酸去除率和水透过系数的分析和评价。
Humic acid (HA), a naturally occurring organic matter, is used as a model pollutant and PVC alloy hollow fiber ultrafiltration membrane is used to remove humic acid in water. The humic acid removal rate and water permeability coefficient were taken as the evaluation indexes. Response surface method was used to design the three-factor-five-center combination design of solution pH, solution ion concentration and initial membrane flux in the ultrafiltration process. The equation fits the functional relationship between the influencing factors and the response, and establishes the regression equation. The results showed that in the process of ultrafiltration of humic acid, the influence of pH value, solution ion concentration and initial membrane flux on humic acid removal rate was significant as follows: solution pH> solution ion concentration> initial membrane flux , The effect on the water transmission coefficient significant size: solution p H value = initial membrane flux> solution ion concentration. The adjusted coefficient Adj.R2 of the humic acid removal rate and the water permeability coefficient equation were 77.10% and 88.12%, respectively, and the significant levels were 0.001504 and 0.0001 respectively, reaching extremely significant levels, indicating that the equation fit well and can be used for super Analysis and evaluation of humic acid removal rate and water permeability coefficient during filtration.