不同超声强度下微囊藻群体沉降及其上浮过程对光照和温度的响应
发布时间：2018-08-16 10:28
【摘要】：以太湖微囊藻群体为研究对象,研究低频超声作用下,4种超声强度和不同处理时间对微囊藻群体的抑制效应,试图得出最优超声参数,同时探讨超声处理后的微囊藻群体对光照和温度的响应.结果表明,当超声强度为0.0353 W/cm~3、处理时间为60 s时,藻细胞沉降量高达80%,且此时藻细胞浓度和叶绿素a浓度均保持不变,表明超声未破碎藻细胞,细胞内含物不会泄漏污染水质,因此作为最优超声参数.随后,对超声处理后的微囊藻群体在不同光照和温度条件下进行恢复培养,结果表明光照和温度均能影响微囊藻群体的浮力恢复,但光照的影响更明显,当光照度为2000 lx时,藻细胞在培养120 h后漂浮率恢复至对照组水平.超声后的藻细胞在较低温度(≤20℃)下漂浮率无显著变化,而在较高温度(25℃)下,培养72 h后漂浮率迅速升高,至120 h能恢复至对照组水平的80%左右.因此,野外超声控藻应选择低光强、低温的时段,采用间歇式多次处理,抑制微囊藻群体上浮,使其彻底沉降.
[Abstract]:The inhibitory effects of four kinds of ultrasound intensity and different treatment time on microcystis in Taihu Lake were studied, and the optimal ultrasonic parameters were obtained. At the same time, the response of microcystis to light and temperature was studied. The results showed that when the ultrasonic intensity was 0.0353 W / cm ~ (3) and the treatment time was 60 s, the sedimentation of algal cells was as high as 80%, and the concentration of algal cells and chlorophyll a remained unchanged, indicating that the contents of the cells did not leak to pollute the water quality without breaking the algal cells by ultrasound. Therefore, as the optimal ultrasonic parameters. The results showed that both light and temperature could affect the buoyancy recovery of microcystis, but the effect of light was more obvious when the light intensity was 2000 LX. After 120 hours of culture, the floating rate of algal cells returned to the level of control group. There was no significant change in the floatation rate of algal cells at lower temperature (鈮，
本文编号：2185709
[Abstract]:The inhibitory effects of four kinds of ultrasound intensity and different treatment time on microcystis in Taihu Lake were studied, and the optimal ultrasonic parameters were obtained. At the same time, the response of microcystis to light and temperature was studied. The results showed that when the ultrasonic intensity was 0.0353 W / cm ~ (3) and the treatment time was 60 s, the sedimentation of algal cells was as high as 80%, and the concentration of algal cells and chlorophyll a remained unchanged, indicating that the contents of the cells did not leak to pollute the water quality without breaking the algal cells by ultrasound. Therefore, as the optimal ultrasonic parameters. The results showed that both light and temperature could affect the buoyancy recovery of microcystis, but the effect of light was more obvious when the light intensity was 2000 LX. After 120 hours of culture, the floating rate of algal cells returned to the level of control group. There was no significant change in the floatation rate of algal cells at lower temperature (鈮，
本文编号：2185709
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