水质安全的动态超声波强化混凝除藻水处理试验研究

发布时间：2018-05-24 23:01

本文选题：蓝藻 + 超声波　；参考：《环境科学学报》2015年08期

【摘要】：超声波辐射能够破坏蓝藻气囊,在水处理工艺中达到强化蓝藻混凝沉淀的效果.然而不适当的超声处理会进一步破坏蓝藻细胞,导致胞内毒素大量释放,加重水质污染负荷.本研究为获得水质安全的超声波强化混凝沉淀蓝藻水处理方法,采用频率40~120 k Hz的超声波辐射蓝藻水,考察处理后蓝藻混凝沉淀去除效果及藻毒素释放情况.结果表明,频率68~120 k Hz、能量密度59.1~186.4 W·L-1的静态超声波作用10~15 s后进行混凝沉淀,藻类去除率达98%以上,且频率越高效果越好;然而各频率静态超声波作用5 s以上均会导致藻细胞内藻毒素释放.采用内衬吸声棉及动态超声方式,频率120 k Hz、能量密度38.5~196.6 W·L-1超声波作用7.5~30 s后,可避免胞内藻毒素释放,且能去除水中溶解性藻毒素18.7%~30.7%,混凝沉淀后藻类去除率97.0%以上,其它有机物也降低.
[Abstract]:Ultrasonic radiation can destroy cyanobacteria sac and enhance coagulation and sedimentation of cyanobacteria in water treatment process. However, improper ultrasound treatment will further damage cyanobacteria cells, resulting in a large amount of endotoxin release, increasing water pollution load. In order to obtain a safe ultrasonic enhanced coagulation precipitation method for cyanobacteria water treatment, the removal effect of cyanobacteria coagulation precipitation and the release of phycotoxin were investigated by ultrasonic radiation of 40 ~ 120kHz. The results showed that the removal rate of algae was more than 98%, and the higher the frequency was, the better the effect was, when the frequency was 68 ~ 120 kHz and the energy density was 59.1 ~ 186.4 W ~ (-1) ~ (-1). However, static ultrasound at various frequencies for more than 5 seconds resulted in the release of algal toxin in algal cells. By means of acoustic cotton lining and dynamic ultrasound, with a frequency of 120 kHz and an energy density of 38.5 ~ 196.6 W 路L ~ (-1), the release of intracellular algal toxin could be avoided, and the dissolved algal toxin could be removed from the water. The removal rate of algae after coagulation and sedimentation was more than 97.0%. Other organic compounds are also reduced.
【作者单位】：扬州大学环境科学与工程学院;
【基金】：江苏省大学生实践创新训练计划项目(No.201411117045Z) 江苏省科技支撑计划项目(No.BE2014681) 江苏高校优势学科建设工程资助项目~~
【分类号】：TU991.2

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