Wastewater solid-liquid separator and separation method thereof

The invention relates to a wastewater solid-liquid separator and a separation method thereof, which belongs to the technical field of sewage treatment. A plurality of multi-layered filter elements are arranged in a solid-liquid separation cabinet, the four sidewalls of each multi-layered filter element are three screens and a discharge door, and the bottom plate is a bottom plate screen; an influent water distribution pipe is arranged on the top of each multi-layered filter element; a water collection area is under each multi-layered filter element; the water collection areas are connected to anaerobic water distribution pipes through a water collection pipe, and the anaerobic water distribution pipes are mounted in upflow anaerobic reaction tanks; the tops of the upflow anaerobic reaction tanks are connected to a sludge-water separation tank; sludge funnels are arranged at the joints between the bottom of the sludge-water separation tank and the upflow anaerobic reaction tanks; the sludge-water separation tank is also provided with sludge outlet pipes, and the sludge outlet pipes are connected to a sludge suction pump; and the top of the sludge-water separation tank is also provided with a water outlet. The invention comprehensively solves sludge and colloidal substances in the pretreatment of piggery wastewater, water which finally comes out of a water outlet pipe does not carry sludge, little colloid or even no colloid exits in the water, and thereby the difficulty of subsequent sewage treatment is decreased.