Zhang Guangming, Wang Bo, Zhang Panyue, Wang Li, Wang Hui
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin, China.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2006;41(7):1379-90. doi: 10.1080/10934520600657156.
Algae bloom in source water has caused serious problems in drinking water supplies, and conventional methods for its treatment have achieved only limited success. This paper reports a new technology, ultrasound assisted coagulation, for effective removal of algae cells from the source water in water treatment works. The results showed that ultrasonic pretreatment significantly enhanced the removal efficiency of algae cells. Ultrasonic irradiation for 5 s increased the algae removal efficiency by more than 20% when the coagulant dose was 0.4-0.8 mg/L. To achieve the same algae removal ratio of 90%, sonication for 5 s reduced the coagulant dose by 2/3. The optimal sonication parameters were determined as follows: sonication time of 1 s, ultrasonic power of 48 W, and solution pH of 8-9. The sound frequency had little impact on the algal removal efficiency. Ultrasonic pretreatment also significantly reduced the sample turbidity.
源水中的藻华已给饮用水供应带来严重问题，而传统的处理方法成效有限。本文报道了一种新技术——超声辅助混凝，用于在水处理厂中有效去除源水中的藻类细胞。结果表明，超声预处理显著提高了藻类细胞的去除效率。当混凝剂投加量为0.4 - 0.8 mg/L时，超声辐照5 s可使藻类去除效率提高20%以上。为达到相同的90%的藻类去除率，超声处理5 s可使混凝剂投加量减少2/3。确定的最佳超声参数如下：超声时间1 s、超声功率48 W、溶液pH值8 - 9。声频对藻类去除效率影响不大。超声预处理还显著降低了样品浊度。
