低温和短光照时间对藻类生长抑制效果研究

给水系统中藻类滋生会给饮用水的生产带来诸多危害，特别是对沉淀池的污染问题已逐渐受到供水企业关注. 考察不同温度和光照时间对藻类生长的影响，实验结果表明，将水温降低至16 ℃，可以使藻类的增长速率常数K_i减少至0.812 d?1；缩短光照时间可以进一步抑制藻类生长. 根据研究结果在给水厂沉淀池安装高压喷雾降温装置进行生产性实验，结果表明，在沉淀池中安装高压喷雾装置，同时将该装置的运行条件设置为降低水面温度至16 ℃，每天运行20 h，对藻类的控制率可达到41.7%. 结果为上海及其他地区给水厂沉淀池的藻类控制提供示范作用.

Research on Inhibition Effect of Low Temperature and Short Illumination Time on Algal Growth

Algal breeding in water supply system bring a lot of harm to the production process of drinking water, especially for the pollution of sedimentation tanks has been paid more attention by water supply enterprises. Effects of different temperatures and illumination time on algal growth was studied. The results shows that the value of algal growth rate constant is reduced to 0.812 d?1 by lowering the water temperature to 16℃, and algal growth can be further inhibited by shortening illumination time. According to the research results, the high pressure spray cooling device was installed in the sedimentation tank of the water plant for productive test and the results prove that the control rate of algae can reach 41.7% by using a high pressure spray device with the water surface temperature of 16℃ and the operation time of 20 h. The results can provide a demonstration for algal control in the sedimentation tanks of water supply plants in Shanghai and other areas.