Journal of East China Normal University(Natural Science) ›› 2020, Vol. 2020 ›› Issue (1): 103-109.doi: 10.3969/j.issn.1000-5641.201831012

• Ecological and Environmental Sciences • Previous Articles     Next Articles

Performance of lime-based algae control in urban landscape water

ZHOU Yunchang1,2,3, HE Yan1,2,3, CHEN Jinghan1,2,3, HUANG Minsheng1,2,3   

  1. 1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;
    2. Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, East China Normal University, Shanghai 200241, China;
    3. Institute of Eco-Chongming, East China Normal University, Shanghai 200241, China
  • Received:2018-12-29 Published:2020-01-13

Abstract: In this research, we studied the effect of lime dosages on algae control as well as the dynamic changes in nitrogen and phosphorus nutrients in urban landscape water based on the growth and decline of algae blooms at Guhua Park in Shanghai. The results showed clear seasonal variations in algae biomass in Guhua Park. The growth of algae could be inhibited by the addition of lime, and the inhibition performance improved with increases in lime dosage. Specifically, the algal inhibition rate ranged from 20% to 46% when the applied lime dosage increased from 0.02 g/L to 0.2 g/L. When the lime dosage increased from 0.2 g/L to 0.5 g/L, however, there was no significant increase in inhibition efficiency observed. Therefore, considering both algal inhibition efficiency and economic cost, the optimum dosage of lime is 0.2 g/L. Meanwhile, nitrogen and phosphorus nutrients in water initially increased and then decreased, reaching a final dynamic equilibrium. This study offers a new approach for algae control of urban landscape water.

Key words: urban landscape water, eutrophication, lime, algae control

CLC Number: