摘要
原水中有机物的成分对混凝絮体特性的影响直接关系到混凝工艺的处理效果。以草酸和柠檬酸为研究对象,分析了混凝过程中有机羧酸的存在对混凝过程形成的絮体颗粒大小、分形维数、Zeta电位的影响。结果表明:当有机羧酸浓度在一定范围内时,随着其浓度的增加,絮体颗粒的Zeta电位及分形维数降低,同时絮体颗粒的成长速率及其稳定成长后的大小均呈下降趋势,并且柠檬酸带来的这种抑制作用更加显著,这是因为有机羧酸占据了微絮体表面而导致絮体活性及致密性降低。
The organic matter in raw water has significant influence on the characteristic of flocs formed during coagulation process, which directly determines the efficiency of coagulation. The impact of carboxylic acid （oxalic acid and citric acid） on the size, fractal dimension and Zeta potential of the floes formed during coagulation process was analyzed. The results showed that as the concentration of carboxyl- ic acid was increased to a certain extent, Zeta potential and fractal dimension of the floes were decreased. Meanwhile, the size and growth velocity of the floes showed a tendency to decrease, and the inhibitory effect caused by citric acid was more notable compared to oxalic acid. All the results indicated the occup- ying of the floc surface by carboxylic acid resulted in the decrease in activity and compactivity of the floes.
出处
《中国给水排水》
CAS
CSCD
北大核心
2015年第1期61-64,共4页
China Water & Wastewater
关键词
混凝
硫酸铝
有机羧酸
絮体大小
分形维数
coagulation
aluminum sulfate
carboxylic acid
floc size
fractal dimension
