HYBRID SIMPLE SEWAGE TREATMENT METHOD AND APPARATUS HAVING HIGH-SPEED SEDIMENTATION AND FLOATATION

摘要

The present invention provides a rapid sedimentation and floatation-combined type simple sewage treatment method and an apparatus thereof wherein the method comprises: an inflow step of letting sewage flow into an inflow tank via an inlet; a rapid reaction step of inputting a coagulant into the sewage having flown into a rapid reaction tank from the inflow tank, agitating and rapidly mixing and reacting the sewage and the coagulant by a rapid reaction and agitation unit to aggregate the sewage and the coagulant into fine floc; an aggregation step of inputting the coagulant into the sewage with the floc flowing into an aggregation tank from the rapid reaction tank and agitating and slowly mixing and reacting the sewage with the floc and the coagulant to aggregate the sewage and the coagulant into grown floc; a rapid sedimentation step of letting the sewage with the grown floc overflow upwards from the aggregation tank and flow into a rapid sedimentation and floatation tank, and letting the floc rapidly sink by a collision to a fluid rectifying plate inversely inclined in the front of the rapid sedimentation and floatation tank to be deposited into sludge; a floatation step of supplying pressurized water, including compressed air, to the rapid sedimentation and floatation tank and generating fine air bubbles to let floating materials float to a floating space; a floating sludge removal step of removing the floating sludge collected in the floating space by using a floating sludge remover to make the sludge flow in a sludge storage tank; and a treated water outflow step of making treated water, having been subjected to solid-liquid separation by the rapid sedimentation and floatation tank, flow into the treated water storage tank and discharging the treated water to the outside via an outflow tank.