摘要
用流动电位和通量法表征PS中空纤维膜,研究离子强度、离子种类及pH值对膜的流动电位和通量的影响,同时测量了膜的等电点,结果表明流动电位系数(ν)随浓度的增大而减小,等电点随电解质中阳离子价态增大而升高。对0.001mol/L的CuCl2,FeCl3和AlCl3溶液,在pH=6.8时的污染实验,发现污染后流动电位和通量值都有所下降,等电点则有所上升,且通量下降到一定值以后几乎不再下降,经过有效清洗后,流动电位和膜通量恢复到了原来的99%以上,这表明污染只发生在膜表面。
In this paper, the mechanism of coagulation of inorganic suspended particles and their morphological characteristics were studied by microscopic analysis. The results showed that the optimum coagulation pH of inorganic suspended particles was about 7～8, and absorption and charge neutralization was the dominant mechanism when the dosage was lower; and sweeping fiocculation was the dominant mechanism when the dosage was higher. It was found that the mean diameter and fractal dimension increased with agitation time, and finally reached a steady-state; with the coagulant of aluminium sulfate at pH 7, the maximum mean diameter was 0.30 mm, and the fractal dimension was about 1.78. The mean diameter increased with the increases of alum dosage, but the fractal dimension did not vary. However, extremely high dosage of aluminum resulted in an increase of fioc diameter but a decrease of the fractal dimension. The main reason is that the sweeping fiocs is too loose in their structure, and can not resist the shear force.
出处
《水处理技术》
CAS
CSCD
北大核心
2006年第5期36-38,共3页
Technology of Water Treatment
关键词
超滤
表征
污染
流动电位
通量
inorganic suspended particles
flocs
morphology
fractal dimension
