臭氧强化混凝工艺对地表水中藻毒素的去除效果研究

Research of Ozone Strengthening Coagulation Process on the Removal Effect of Algal Toxins in Surface Water

针对于中国北方某地表水源水藻类季节性爆发情况,采用臭氧强化混凝工艺去除藻毒素,实验分别考察了单独投加臭氧及聚合氯化铝(PAC)对微囊藻毒素及浊度、UV_(254)、TOC和高锰酸盐指数的去除效果,研究表明臭氧对MC-LR有较好的去除效果,2 mg/L臭氧对MC-LR的去除率达到了65.74%,对浊度及UV_(254)的去除率达到了29.43%与40.49%,但对TOC及高锰酸盐指数的去除效率却较低,去除率分别为11.59%与9.97%。20 mg/L PAC在单独使用时对MC-LR去除率为15.61%,对浊度、高锰酸盐指数、UV_(254)、TOC的去除率分别为79.21%、58.04%、31.29%与30.12%。在此基础上,采用臭氧-PAC联合工艺,结果表明当2 mg/L臭氧与20 mg/L PAC联用时,对MC-LR的去除率达到了89.87%,对浊度、UV_(254)、TOC及高锰酸盐指数的去除率分别为80.53%、58.75%,34.23%与61.96%。采用臭氧强化混凝联合工艺可以有效地去除该地表水藻类季节性爆发所引起的藻毒素。

With regards of the case of seasonal algae outbreak of surface water in northern China,ozone enhanced coagulation process was used to remove algal toxins,experiments were done to respectively investigate the separate adding ozone and polyaluminium chloride（PAC） for removal of microcystin（MC-LR）,turbidity,UV254,TOC and CODMn. Results show that ozone has a good removal effect for MC-LR,2 mg/L ozone removal of MC-LR reached 65.74%,turbidity and UV254 removal rate reached 29.43% and 40.49%,but low on the TOC and CODMnremoval efficiency,with removal rate as11.59% and 9.97% respectively. 20 mg/L PAC used alone for MC-LR removal rate was 15.61%,while on the removal rate of turbidity,UV254,TOC,and CODMnwere 79.21%,58.04%,31.29% and 30.12% respectively. On this basis,using ozone-PAC combined process,the results show that when 2 mg/L ozone and 20 mg/L PAC combined,removal rate for MC-LR was 89.87%,while for turbidity,UV254,TOC and CODMnwere 80.53%,58.75%,34.23% and 61.96% respectively. Ozone enhanced coagulation process can effectively remove the surface water algae algal toxins caused by seasonal outbreaks.