CAOChen-jie,XUZhi-qiang,LONGYi-jing,et al.Effect of Flow Velocity on Algal Bloom in Landscape Water Replenished with Reclaimed Water[J].China Water & Wastewater,2023,39(17):65-69.
Effect of Flow Velocity on Algal Bloom in Landscape Water Replenished with Reclaimed Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第17期
Page:
65-69
Column:
Date of publication:
2023-09-01
- Keywords:
- reclaimed water; landscape water body; flow velocity; algal bloom
- Abstract:
- Algal bloom has always been a bottleneck restricting the application of reclaimed water in landscape water, and improving hydrodynamic conditions is one of the effective methods to control algal growth. Based on the identification of dominant algal species (Microcystis aquatica, Chlorella vulgaris and Tetraodontophora) in a typical water body replenished with reclaimed water, this paper analyzed the effects of flow velocity (0, 0.05 m/s, 0.1 m/s, 0.2 m/s) on the growth of the three dominant algal species in simulated water and actual reclaimed water. When the flow velocity was in the range of 0-0.05 m/s, the algal growth was promoted, and the dominant flow velocity was 0.05 m/s. When the flow velocity was no less than 0.1 m/s, the growth of algae was inhibited, the algal density of the three dominant algal species decreased by more than 80% within 10 days, and the concentrations of chlorophyll a (Chl-a) decreased from approximately 180-200 mg/m3 to below 35 mg/m3. When the flow velocity was increased to 0.2 m/s, the algal density and Chl-a concentration in the water could not be detected on day 9. Therefore, the occurrence of algal bloom in the water body replenished with reclaimed water could be effectively controlled when the water flow velocity was controlled above 0.1 m/s.
Last Update:
2023-09-01