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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 effect of the composition of organic matter in the raw water on the flocculation characteristics of the flocculation directly affects the treatment effect of the coagulation process. Taking oxalic acid and citric acid as the research objects, the influence of organic carboxylic acids in coagulation process on floc size, fractal dimension and Zeta potential was analyzed. The results showed that when the concentration of organic carboxylic acid was within a certain range, the Zeta potential and fractal dimension of floc particles decreased with the increase of the concentration of flocculant. At the same time, the growth rate of floc particles and the size of floc particles decreased This inhibition by citric acid is even more pronounced because organic carboxylic acids occupy the surface of the micro-flocs resulting in reduced floc activity and densification.