Microalgae particle screening and separating device and method combining porous flow and alternating current-dielectrophoresis

The invention provides a device and a method for screening and separating microalgae particles by combining porous flow and alternating current-dielectrophoresis. The device comprises a porous flow separation device based on particle volume screening and an alternating current-dielectrophoresis separation device based on microalgae lipid content screening. The porous flow separation device is composed of an inlet, a filter, a porous section and three outlets, microalgae particles in the porous section generate lateral displacement under the inertia force of fluid, and microalgae cells with different sizes move to different outlets after passing through the device. The alternating current-dielectrophoresis sorting device is composed of an inlet, a sorting area and an outlet, the sorting device generates a high-gradient non-uniform electric field through two sets of Ag-PDMS electrodes with asymmetric holes, and microalgae cells with different lipid contents enter different outlets after sorting, so that screeni