Mexican Institute for Water Technology, IMTA, Paseo Cuauhnahuac 8532, Jiutepec, Mor., 62550, México.
Water Sci Technol. 2012;65(3):434-9. doi: 10.2166/wst.2012.865.
This paper presents the results of a study on electrogeneration of aluminium, as a coagulant to remove silica in make-up water for cooling towers. Three electrochemical systems were tested, two with aluminium electrodes (one with polarity change and another without it), and a third one with aluminium anodes and cathodes of stainless steel. From the obtained results it was concluded that under the studied conditions, the most advantageous system to produce aluminium and remove silica is the one with both electrodes of aluminium working with direct current. Due to chemical production of aluminium at the cathode, the concentration of aluminium in the water at the outlet of the electrochemical reactor is much higher than the one calculated according to Faraday's law. Under the tested conditions it was possible to remove up to 66% of silica from water containing around 50 mg L(-1).
本文介绍了一种用电化学方法制备铝作为混凝剂去除冷却塔补水中二氧化硅的研究结果。测试了三种电化学系统，两种使用铝电极（一种具有极性变化，另一种没有），第三种使用铝阳极和不锈钢阴极。从得到的结果可以得出结论，在所研究的条件下，最有利于制备铝和去除二氧化硅的系统是两个铝电极在直流电下工作的系统。由于在阴极上化学制备铝，因此在电化学反应器出口处水中的铝浓度比根据法拉第定律计算的浓度要高得多。在测试的条件下，可以从含有约 50mg/L 的水中去除高达 66%的二氧化硅。
