Device and method for determining water flow velocity threshold value of algae aggregation

The invention discloses a device and method for determining a water flow velocity threshold value of algae aggregation, the device comprises a box body, a cover plate, a test barrel, a base, a bearing, a temperature control system, an illumination control system, a driving device and a PLC controller, and the method comprises the following steps: S1, expanding culture of algae; s2, determining rotation time; s3, determining the degree of aggregation of algae at different flow velocities; and S4, determining a water flow velocity threshold for inhibiting algae aggregation. Research on algae aggregation degree difference at different flow speeds is realized by changing the rotating speed of the barrel; the action rule of the water flow condition on algae cell aggregation is researched, and a water flow velocity threshold for inhibiting algae aggregation is determined; reference is provided for a treatment method for inhibiting algal blooms by changing the water flow velocity through a water conservancy project,