Volume 6 Issue 4
Oct.  2013
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Cui-chao PANG, Xin-jian FAN, Jie ZHOU, Shi-qiang WU. 2013: Optimal dosing time of acid algaecide for restraining algal growth. Water Science and Engineering, 6(4): 402-408. doi: 10.3882/j.issn.1674-2370.2013.04.004
Citation: Cui-chao PANG, Xin-jian FAN, Jie ZHOU, Shi-qiang WU. 2013: Optimal dosing time of acid algaecide for restraining algal growth. Water Science and Engineering, 6(4): 402-408. doi: 10.3882/j.issn.1674-2370.2013.04.004

Optimal dosing time of acid algaecide for restraining algal growth

doi: 10.3882/j.issn.1674-2370.2013.04.004
Funds:  This work was supported by the Special Fund for Public Welfare Industry of Ministry of Water Resources of China (Grant No. 200801001), National Science and Technology Major Projects of China (Grant No. 2012ZX07506003-4), and Central Public-interest Scientific Institution Basal Research Fund (Grants No. Y110002 and Y110005).
 
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  • Corresponding author: Cui-chao PANG
  • Received Date: 2012-05-03
  • Rev Recd Date: 2012-10-12
  • Restraining algal growth by algaecide has been studied by many researchers, but the dosing time has not yet been studied. In this study, we examined the appropriate dosing time of algaecide through a series of experiments. In the experiments, the pH value of water is significantly affected by Microcystis aeruginosa, and the variation of the pH value is in favor of the growth of the alga. Therefore, using acid algaecide in the period with maximum pH values, i.e., the stable phase, would change the acidity-alkalinity of the water significantly, and would negatively affect algal growth. Acid algaecide does not eliminate the alga effectively if the acid algaecide is dosed in the logarithmic growth phase. Using acid algaecide in the decline phase after algal bloom not only is unfavorable for eliminating the alga, but also prolongs the decline phase, and even brings about next larger algal bloom.   

     

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