基于电-Fenton法的絮体分形维数和PAM去除率的关系及影响因素研究

Study on Influence Factors and Relationships between Fractal Dimension of Flocs and PAM Removal Rate for Electro-Fenton

以模拟含聚污水为研究对象,在不同反应条件下对其进行电-Fenton处理,探究反应条件对电-Fenton法的化学氧化和絮凝沉降作用的影响规律。实验结果表明:絮体分形维数与上清液浊度呈负相关,其可从微观上较好地表征电-Fenton反应的絮凝沉降效果;PAM去除率及絮体分形维数在不同反应条件下呈现的规律不同,基于二者的变化规律确定的处理条件更加合理;调整电-Fenton反应参数为pH值2.6,FeSO_4加量130 mg/L,H_2O_2加量1mL/L,电流密度25 mA/cm^2,既保证了较高的PAM去除率(95.34%),又增大了絮体分形维数(1.8438),将絮体沉降时间由41 min缩短至26min。

Taking some analog sewages containing polymer as study subjects, the effects on chemical oxidation and flocculating of the sewages under different reaction conditions was studied. The turbidity of the supernatant was tested and analyzed by turbidity meter, the microstructure of flocs was observed by image analyzers and the fractal dimension was calculated by perimeter-size method; the PAM concentration was tested by starch-cadmium iodide method, then PAM removal rate was calculated. The results showed that there was a negative correlation between the fraetal dimension of floes and the turbidity of supematant, so the fractal dimension of floes could represent the effects of flocculation and sedimentation in electric-Fenton treatment. The PAM removal rate and the fractal dimension of floes showed different rules in various reaction conditions; hence, it was more reasonable to adjust the test conditions on the basis of these rules. Under optimal reaction condition of pH value of 2.6, FeSO, dosage of 130 mg/L, H：O2 dosage of 1 mL/L, electric current density of 25 mA/em：, and the PAM removal rate was 95.34%, the fractal dimension of floes was 1.8438 and the subsiding time was 26 min.