Hammond David, Murri Anthony, Mastitsky Sergey, Yang Ziming, Foster Roy, Schweitzer Linda
Earth Science Laboratories, 903 N 47th Street, Rogers, AR 72712, USA.
Department of Chemistry, Oakland University, Rochester, MI 48309, USA.
Heliyon. 2021 Jul 31;7(8):e07706. doi: 10.1016/j.heliyon.2021.e07706. eCollection 2021 Aug.
Ten years of field data from an Oklahoma drinking water utility were analyzed for the effects of an acid-stabilized, ionic copper algaecide/bactericide called EarthTec on geosmin concentrations in the water traveling by pipeline from the source lake to a water treatment plant. The data show that geosmin already present in the raw water is reduced more during periods of applying algaecide than when not. Median reduction in geosmin concentration from pipe intake to pipe outfall by natural degradation without addition of algaecide was 5.6 ng/L removed (56.7% reduction) and improved to 126 ng/L removed (83% reduction) during periods the algaecide was being dosed at 1 μL/L, equivalent to 0.06 mg/L as copper. A laboratory study to replicate the phenomenon at bench-scale showed that either the algaecide itself or its copper-free acidic carrier can be used to depress pH and drive a reaction converting geosmin to an odorless dehydration product, argosmin. Algaecides intuitively reduce the organisms that produce geosmin, but this study shows that geosmin already present in the water is also being reduced through chemical conversion to the odorless argosmin, representing a novel means of geosmin removal in drinking water.
对俄克拉荷马州一家饮用水公用事业公司的十年现场数据进行了分析，以研究一种名为EarthTec的酸稳定离子型铜藻剂/杀菌剂对从源湖通过管道输送到水处理厂的水中土臭素浓度的影响。数据表明，与未使用藻剂时相比，在使用藻剂期间，原水中已存在的土臭素减少得更多。在不添加藻剂的情况下，通过自然降解，从管道进水口到出水口的土臭素浓度中位数降低了5.6 ng/L（降低了56.7%）；在以1 μL/L的剂量投加藻剂期间（相当于以铜计0.06 mg/L），这一数值提高到了126 ng/L（降低了83%）。一项在实验室规模上重现该现象的研究表明，藻剂本身或其无铜酸性载体均可用于降低pH值，并驱动一个将土臭素转化为无味脱水产物——阿戈斯敏的反应。直观地说，藻剂会减少产生土臭素的生物，但这项研究表明，水中已存在的土臭素也会通过化学转化为无味的阿戈斯敏而减少，这代表了一种去除饮用水中土臭素的新方法。
