预氧化对混凝-气浮工艺去除铜绿微囊藻效果的影响

研究了预氧化(高锰酸钾、氯、过氧化氢)对混凝-溶气气浮工艺去除铜绿微囊藻的影响.通过检测出水浊度、藻类浓度以及UV254等指标来评价预氧化对藻类的去除效果.试验结果表明:在氧化剂最佳投量下,经过KMnO4、Cl2和H2O2预氧化后,藻类去除率分别提高了10.81%、11.65%以及9%,其中以氯对藻类去除效果最好,但预氯化过程中引起了藻细胞的破裂使得胞内有机物释放到水中,造成出水中UV254的升高.几种氧化剂对比研究结果表明,采用高锰酸钾预氧化不仅能够节约经济费用,而且不会因藻体内有机物的大量外流而降低出水水质的安全性.

Effect of pre-oxidation on Microcystis aeruginosa removal by coagulation-DAF process

Study was made on the removal of Microcystis aeruginosa by pre-oxidation(chlo- rine,permanganate potassium or hydrogen peroxide)and coagulation-DAF process.The effluent turbidity,algae concentration and UV_(254) were examined,through analyzing the variation of the above values,the effect of pre-oxidation on algae removal could be estimated.The results of the experiment showed that:with the optimal dosage of oxidizers of KMnO_4,Cl_2 and H_2O_2,the removal rate of algae increased 10.81%,11.65% and 9% respectively after pre-oxidation.The highest algae removal rate could be obtained with chlorine pre-oxidation,but unfortunately this method stimulated the releasing of the intracellular components of algae to make effluent UV_(254) increase.Comparison of the results showed that permanganate potassium could save the dosage and improve the water quality,because in this case no intracellular components of algae were released.