Patent ID: 6962653
Filing Date: 2005-11-08
Classification: C02F,Y02W

Abstract:
1. An autothermal aerobic digestion system having closed defoaming system, the digestion system comprising: a digester having a corn shaped bottom and an upper lid, the digester being of an insulator; a suction valve installed at a bottom of the digester, for discharging wastewater; at least two nipples dispersedly installed at an inner side of the digester, for returning the wastewater from the suction valve to the digester for recycling; a pump for providing a power for recycling the wastewater through the nipples; an aeration venturi and a defoamer venturi connected to the discharging nipples for aeration and defoaming during the recycling of the wastewater; a liquid defoaming apparatus or a mechanical defoaming apparatus installed at an upper side of the digester, for primarily getting rid of foam generated in the wastewater; a first foam sensor installed at a predetermined level of the inner side of the digester, for driving the defoaming apparatus when the foam contacts the first foam sensor; a second foam sensor installed at a level higher than the first sensor, for stopping operation of the defoaming apparatus when the foam contacts the second foam sensor; a foam bypass having a passage connected to the second foam sensor, for bypassing the foam when the foam contacts the second foam sensor and having a passage connected to the defoamer venturi; a hose for making extra foam overflow therethrough when the defoamer venturi cannot process all of the foams; and a foam collector pipe connected to the hose and connected to the aeration venturi for returning the foam to the digester.