SEWAGE SEPTIC TANK

摘要

PURPOSE: A sewage septic tank is provided to easily and efficiently purify sewage and further extend life cycle of a filter medium by removing or decomposing floating matter such as oil and non-oil substances to a certain extent before sewage is purified. CONSTITUTION: In a septic tank which is sequentially comprised of a flow equalization tank (U), one or more aeration tanks (P,P') and a settling tank (C), and in which filter mediums (Y,Y') are installed in the aeration tanks (P,P'), the sewage septic tank is characterized in that a separation tank (B) is formed at the outer side of the aeration tanks (P,P'), a floating pipe(10) having a certain length which is connected to the outside is longitudinally installed in the central part of the separation tank (B), a diaphragm(11) and a conical shaped separation plate(12) on the lower part of which several inlet holes(121) are formed are formed at a circumference of the central part and at an end part of the floating pipe(10) respectively, the separation tank (B) is divided into a first separation chamber (B1), a second separation chamber (B2) and a discharge chamber (B4), discharge grooves(112) are formed on the upper surface of the diaphragm(11) in a volute shape, a trough(113) is formed along the outer circumference of the diaphragm(11) so that the trough(113) is connected to the flow equalization tank (U) by an injection pipe(114), a filtering chamber (B3) having a certain size the upper side of which is connected to the discharge grooves(112), and in which filter medium(41) is filled is formed around the floating pipe(10) between the diaphragm(11) and the separation plate(12) so that the inner part of the filtering chamber (B3) is connected to the second separation chamber (B2) through supply holes (B31) formed on the bottom of the filtering chamber (B3), a supply pipe(21) to the upper part of which an inlet pipe(31) is perpendicularly connected is longitudinally installed in the central part inside the floating pipe(10), and one end of a recovery pipe (C1) of the settling tank (C) is introduced into the upper side of the floating pipe(10).