饮用水处理过程中对藻类的控制研究

Control of Algae in Treatment of Drinking Water

某给水厂原水中的藻类含量较高,且其常规处理工艺的除藻效果不理想,为此提出投加高锰酸钾和粉末活性炭(PAC)的强化除藻措施,通过模拟试验考察了分别单独投加高锰酸钾和PAC以及高锰酸钾与PAC联合投加3种方法的强化除藻效果,并对实际生产应用效果进行了分析。结果表明,高锰酸钾与PAC联用对藻类的强化去除效果最好,除藻率高达96%;同时通过实际应用分析可知,高锰酸钾与PAC的联合投加还可有效控制三卤甲烷的生成和去除微囊藻毒素、降低氯耗、缩短后续滤池的反冲洗时间。另外,在实际应用中发现,通过遮阳手段能有效阻止藻类的繁殖。

The raw water from a waterworks has high content of algae, and the conventional techniques are ineffective in removing algae. Therefore, potassium permanganate and powdered activated carbon { PAC） were used for enhanced algae removal. The enhanced effects of algae removal by respective addition of potassium permanganate and PAC and combined addition of potassium permanganate and PAC were investigated through simulation test, and the application effect in the actual production was analyzed. The results show that the combined addition of potassium permanganate and PAC has the best removal efficiency of algae, and the removal rate of algae is up to 96%. This eombined addition process can also effeetively control the formation of trihalomethanes, remove mierocystin, reduce chlorine consumption and shorten backwashing time of subsequent filter. In addition, the algae reproduction can be inhibited using sunshades.