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Li Yan, Zhang Yinjiang, Liu Xiaopei, Wu Hao, Zhang Leting, Duan Ting, Li Zhen, Zhang Manman. Retention time and effects on water quality and phytoplankton of water shade agent-True Blue[J]. Chinese Journal of Environmental Engineering, 2013, 7(4): 1301-1307.
Citation: Li Yan, Zhang Yinjiang, Liu Xiaopei, Wu Hao, Zhang Leting, Duan Ting, Li Zhen, Zhang Manman. Retention time and effects on water quality and phytoplankton of water shade agent-True Blue[J]. Chinese Journal of Environmental Engineering, 2013, 7(4): 1301-1307.
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Retention time and effects on water quality and phytoplankton of water shade agent-True Blue

  • 1.

    College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China

  • 2.

    Engineering Research Center for Water Environment and Ecology in Shanghai, Shanghai 201306, China

  • Received Date: 05/12/2012
    Accepted Date: 12/11/2012
    Available Online: 09/04/2013
    Fund Project:
  • Water shade agents can interfere with underwater light to inhibit the growth of algae. To evaluate the effects of water shade agent-True Blue (TB) on natural waters, the investigations of the TB retention time and changing characteristics of water quality, phytoplankton and submerged plant in enclosures were carried out. The results showed that 1 mg/L concentration of TB had degraded over 50% in 5 weeks, and over 95% after 9 weeks in the enclosure water. Compared with the control groups, there were no obvious effects found on total nitrogen and total phosphorus concentration by the TB. The permanganate index increased to 8.60 mg/L was caused by the oxidation composition in TB, and permanganate index gradually dropped to 7.81 mg/L along with the degradation of TB. Underwater light intensity attenuated obviously by the affecting of TB, the light intensity in 0.2 m depth was only 21.16% that of the water surface, and the diffuse attenuation coefficient (k) was 0.7 m-1. The growth of algae was obviously inhibited by the TB, which inhibition rate reached 56.24%, and no significant influence on the growth of Ceratophyllum demersum was found.
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Retention time and effects on water quality and phytoplankton of water shade agent-True Blue

  • Received Date: 05/12/2012
  • Accepted Date: 12/11/2012
  • Available Online: 09/04/2013
Fund Project:

Abstract: Water shade agents can interfere with underwater light to inhibit the growth of algae. To evaluate the effects of water shade agent-True Blue (TB) on natural waters, the investigations of the TB retention time and changing characteristics of water quality, phytoplankton and submerged plant in enclosures were carried out. The results showed that 1 mg/L concentration of TB had degraded over 50% in 5 weeks, and over 95% after 9 weeks in the enclosure water. Compared with the control groups, there were no obvious effects found on total nitrogen and total phosphorus concentration by the TB. The permanganate index increased to 8.60 mg/L was caused by the oxidation composition in TB, and permanganate index gradually dropped to 7.81 mg/L along with the degradation of TB. Underwater light intensity attenuated obviously by the affecting of TB, the light intensity in 0.2 m depth was only 21.16% that of the water surface, and the diffuse attenuation coefficient (k) was 0.7 m-1. The growth of algae was obviously inhibited by the TB, which inhibition rate reached 56.24%, and no significant influence on the growth of Ceratophyllum demersum was found.

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