Patent ID: 6790347
Filing Date: 2004-09-14
Classification: C02F,Y02W,Y10S

Abstract:
A wastewater treatment apparatus comprising:a bottom portion and a plate formed above and spaced apart from the bottom portion to form a lower chamber with the bottom portion; an outlet installed on the bottom portion for drawing off water and sludge in the lower chamber before backwashing; a filter medium layer supported to the upper portion of the plate by the plate, the upper layer of which forms a bottom portion of an upper chamber; a wastewater introducing means connected to the lower chamber, for introducing wastewater to be treated into the lower chamber; a process air introducing means for supplying process air to the filter medium layer formed over the plate; a plurality of aerators formed over and spaced apart a predetermined distance from the plate, and mounted in a plurality of air flow pipes led to the process air introducing means; a backwash air introducing means for supplying backwash air to the lower chamber during backwashing; a backwash water introducing means for supplying backwash water to the lower chamber during backwashing; a plurality of nozzles extending from the lower chamber to the filter medium layer through the plate; a treated water discharging means for discharging the treated water having passed through the filter medium layer; and a returned water introducing means for returning the treated water having passed through the filter medium layer to the lower chamber.