摘要
近年来,改性粘土除藻技术广泛应用于"水华"的治理当中,其原理是藻类与改性粘土絮凝后自然沉降.通过对铜绿微囊藻(Microcystis aeruginosa)、集胞藻(Synechocystis sp.)和小球藻(Chlorella vulgaris)的絮凝比较,发现具气囊的铜绿微囊藻比其他两种藻发生再悬浮的幅度更大,次数更多.针对我国的水华藻类是以微囊藻(Microcystis sp.)等为主的情况,研究超声波和改性粘土集成技术对藻类的去除效果.结果表明,超声波和改性粘土集成技术能将藻类去除率明显提高,该法的絮体稳定性比单一絮凝法明显增强,且对群体形态的藻的去除率提升效果更好.另外,在40kHz、160W超声辐照下,铜绿微囊藻的气囊去除率在95%以上,但细胞壁保持完好,细胞活性不变,藻毒素不会因细胞破裂而释放,因此超声波和改性粘土集成方法,是治理我国蓝藻水华的有效方法.
The technique of the modified-clay to control algal blooms has been widely applied, and removal of algal cells can be done through the flocculation of cells with modified-clay. Microcystis aeruginosa, a primary water bloom forming eyanobacteria with the gas vesicle, was shown to resuspend more frequently than non-gas vesicle algae, Synechocystis sp. and Chlorella vulgaris. The purpose of this paper was to study the integrated technique of ultrasonic treatment and the modified-clay to remove algal blooms, based on the fact that the main bloom-forming species in Chinese waters are Microcystis spp. with gas vesicle. The results showed that the integrated technique could greatly increase the efficiency of algal removal, especially removal of colony form of M. aeruginosa. 160W ultrasonic power and 40 kHz ultrasonic frequency were found to maintain cyanobaeterial cell wall and cell viability unchanged, and therefore the release of algal toxins caused by cellular decomposition were avoided.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2010年第3期421-429,共9页
Journal of Lake Sciences
基金
国家科技重大专项项目(2008ZX07105-006)
中国科学院“百人计划”项目(082303-1-501)联合资助
关键词
铜绿微囊藻
超声波
改性粘土
絮凝
气囊
再悬浮
水华去除
Microcystis aeruginosa
uhrasonic
modified-clay
flocculation
gas vesicle
resuspension
algal bloom removal
