高藻及微囊藻毒素污染原水的应急处理工艺研究

Study on Emergent Treatment Technologies Used in Algae-laden and Microcystins Pollution Raw Water

通过静态试验研究了由于藻类暴发所产生的各种问题的应急处理措施。结果表明:对于高藻期的原水,调节其pH值到6.0左右并投加10 mg/L的粉末活性炭,可明显改善混凝工艺对藻类的去除效果,藻类去除率从60%提高到96%,沉淀出水中的藻类含量稳定在200×104个/L左右,同时还能有效去除水中的土嗅素和二甲基异冰片等致嗅物质,并有一定的助凝作用;对于高藻期后水中较高浓度(约10μg/L)的溶解性微囊藻毒素,可通过投加粉末活性炭(投量为20mg/L,并确保接触时间>40 m in)使其含量降到水质标准值以下。

Jar-tests were made to study the proper emergent treatment technologies of treating algae-laden and dissolved microcystins pollution raw water, The results show that adjusting the pH value of raw water to around 6.0 and adding 10 mg/L of powdered activated carbon （PAC） can significantly improve the removal effects of algae through coagulation, The removal rate raises from 60% to 96% and the content of algae in the outflow of sedimentation drops and steadies at around 200 × 10^4 cell/L. The addition of PAC can drop the concentration of geosmin and 2-methylisoborneol to below the threshold of them （5 ng/L）. For high contents of dissolved microcystins when algae perish, dosing 20 mg/L PAC and contact time 〉 40 min can drop the initial concentration of 10μg,/L to below the requirement of the water quality standard （1μg/L）.