Phoochinda W, White D A
Department of Chemical Engineering, Faculty of Engineering, Imperial College of Science, Technology and Medicine, London SW7 2BY, United Kingdom.
Environ Technol. 2003 Jan;24(1):87-96. doi: 10.1080/09593330309385539.
This paper describes the removal of algae and attached water using a froth flotation method as a function of the collector type, aeration rates, the pH of the algal suspension and temperature of operation. Dispersed air flotation was used in this study to remove Scenedesmus quadricaudo. The addition of surfactants such as cetyltrimethylammonium bromide and sodium dodecylsulfate increased the aeration rates and reduced the size of air bubbles. Only cetyltrimethylammonium bromide gave high algal removal (90%) whereas sodium dodecylsulfate gave poor algal removal (16%). However, by decreasing the pH values of the algal suspension, it was possible to increase the algal removal efficiency up to 80%. Low temperature operation had an important effect on reducing the rate of algal removal but when the temperature was 20 degrees C or higher there was little change with further temperature rises. The amount of water removed with the algal phase was reduced by using a two-stage flotation process.
本文描述了采用泡沫浮选法去除藻类及附着水的过程，该过程是收集器类型、曝气速率、藻类悬浮液pH值及操作温度的函数。本研究采用分散空气浮选法去除四角栅藻。添加十六烷基三甲基溴化铵和十二烷基硫酸钠等表面活性剂可提高曝气速率并减小气泡尺寸。只有十六烷基三甲基溴化铵能实现较高的藻类去除率（90%），而十二烷基硫酸钠的藻类去除率较低（16%）。然而，通过降低藻类悬浮液的pH值，可将藻类去除效率提高至80%。低温操作对降低藻类去除速率有重要影响，但当温度达到20℃或更高时，温度进一步升高变化不大。采用两级浮选工艺可减少随藻类相去除的水量。
