Sedimentation tank system including high-rate filtration part and capable of primary treatment of sewage and wastewater, flow equalization, and treatment of wet weather flow

A sedimentation tank system for removing solids in an influent sewage and wastewater, the sedimentation tank system comprising:

• a filtration part which includes a filter medium and removes solids in the influent sewage and wastewater;
• a sedimentation tank with a water gate formed at a predetermined height to store sewage and wastewater flowing over the water gate;
• an outflow distribution channel that receives from the filtration part, sewage and wastewater from which solids have been removed, and discharges the same to an outside of the sedimentation tank;
• a pump station configured to pump the influent sewage and wastewater to flow into the filtration part;
• and
• a flow rate adjustment pipe connecting a lower end of the sedimentation tank and the pump station to enable the inflow and outflow of sewage and wastewater between the pump station and the sedimentation tank,
• wherein the sedimentation tank system is configured such that the sewage and wastewater stored in the sedimentation tank flows back to the pump station via the flow rate adjustment pipe, and the pump station pumps the returned sewage and wastewater to the filtration part so that the returned sewage and wastewater is filtered by the filter medium.