| 紊流脉动强度对藻类生长及水环境的影响研究 |
| 摘要点击 1524 全文点击 852 投稿时间：2012-07-13 修订日期：2012-10-12 |
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| 中文关键词 紊流 脉动强度 藻类生长 振动格栅 氮磷比 |
| 英文关键词 turbulent fluctuation intensity algae growth oscillating grid nitrogen-phosphorus ratio |
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| 中文摘要 |
| 为探讨紊流脉动强度对藻类生长繁殖以及水环境的影响,采用自行设计的垂直振动格栅紊流装置,在一定的光照和水温条件下,通过改变各组实验装置中格栅的振动频率,在营养盐充足的封闭水体中开展了实验研究. 结果表明,在实验设定的紊动范围内,紊流脉动强度对藻类的生长以及水环境的变化有明显的影响,较微弱的紊流脉动能促进水体中藻类的生长,而较强的紊流脉动则会抑制藻类的生长; 随着紊流脉动强度的增加,藻类生物量峰值的出现时间逐渐推迟; 不同水力条件下,5组实验过程中氮磷含量的变化情况具有显著的差异,当格栅振动频率达到2.0 Hz时,较之振动频率为0.5 Hz的实验,水体中TN和TP的最大消减量分别降低了55.2%和69.0%,与藻类生长情况关系密切; 随着紊流脉动强度的增加,藻类生物量的峰值所对应的氮磷比先增后减; 不同强度的紊流脉动均能促进水体的pH值和溶解氧迅速调节至藻类生长所需的最佳水平,且最佳值不变. |
| 英文摘要 |
| Through a self-designed vertically oscillating grid experiment device, the experiment was carried out to research the effects of the turbulence fluctuation intensity on the growth of algae and water environment in the water with adequate nutrients by changing the vibration frequency under a certain light and temperature conditions. The results showed that: the turbulent fluctuation has significant effects on algae growing that weak turbulence fluctuation can promote the growth of algae and strong turbulence fluctuation will inhibit the growth of algae in the range of experimental level. With the increase of the turbulent fluctuation intensity, the peak of algal biomass gradually delayed. Changes of nitrogen and phosphorus in the experimental process have significant differences, when the vibration frequency was up to 2.0 Hz, the maximum reduction of TN and TP were 55.2% and 69.0% lower compared with 0.5 Hz, which was closely associated with the growth of algae. With the intensity of turbulent fluctuation increases, nitrogen-phosphorus ratio first increases and then decreases corresponding to the peak of the algal biomass. Turbulent fluctuation can promote the pH and dissolved oxygen quickly adjusted to the level of algae growing required, and the most appropriate value remains unchanged. |
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