Wiley Patrick E, Trent Jonathan D
PERC Water Corporation, 959 South Coast Drive, Suite 315, Costa Mesa, CA 92626, USA.
NASA Ames Research Center, Moffett Field, CA 94035, USA.
Water Sci Technol Water Supply. 2016 Apr 1;16(2):314-323. doi: 10.2166/ws.2015.140. Epub 2015 Sep 16.
Algae contamination of surface water and drinking water supplies is a significant problem particularly in rural areas. A decentralized inexpensive technology that would effectively remove algae from water would be beneficial. Electrocoagulation (EC) combined with electroflotation (EF) as a single process (ECF) is a promising algae harvesting technique with no moving parts that may be powered using a modest array of photovoltaic panels if a low power system can be developed. Here, an ECF system was constructed to study the energy required to remove algae from a simulated drinking water supply. Results from 18 ECF experiments indicated a >95% improvement of water clarity measured by optical density (OD) could be achieved with as little energy as 1.25 kWh m. The key was to find the ideal combination of gas bubbles produced by EF (G) and coagulant from the EC relative to the concentration of suspended solids (S). The ideal gas to solids (G/S) ratio for the ECF system ranged from 0.09 to 0.17. In solutions containing chloride (Cl) ions ECF produced chlorine gas which is known to contribute to disinfection. Results suggest that ECF can efficiently remove algae and simultaneously contribute to disinfecting contaminated drinking water supplies.
地表水和饮用水供应中的藻类污染是一个重大问题，在农村地区尤为突出。一种能够有效去除水中藻类的分散式廉价技术将大有裨益。电凝聚（EC）与电浮选（EF）结合作为一个单一过程（ECF），是一种很有前景的藻类收集技术，该技术没有活动部件，如果能开发出低功率系统，可用适度的光伏板阵列供电。在此，构建了一个ECF系统，以研究从模拟饮用水供应中去除藻类所需的能量。18次ECF实验结果表明，通过光密度（OD）测量，只需1.25千瓦时/立方米的能量就可使水的清澈度提高95%以上。关键在于找到电浮选产生的气泡（G）和电凝聚产生的凝聚剂与悬浮固体浓度（S）的理想组合。ECF系统的理想气固比（G/S）在0.09至0.17之间。在含有氯离子（Cl）的溶液中，ECF会产生已知有助于消毒的氯气。结果表明，ECF可以有效去除藻类，同时有助于对受污染的饮用水供应进行消毒。
