Method and apparatus for sludge reduction in a waste water treatment system

摘要

A method and an apparatus for treating organic waste water capable of deodorizing an exhaust gas diffused into an atmosphere is provided, wherein loss of heat energy is small and the amount of an organic or inorganic nitrogen compound in an effluent from the apparatus is low. In the method of the present invention, organic waste water is nitrified in a nitrification device 8, denitrified in a denitrification device 9, and subjected to an aerobic biological treatment in a aeration tank 10, and then the treated mixture is solid-liquid separated in a solid-liquid separation device 3. A portion of an excess sludge separated in the solid-liquid separation device 3 is solubilized at a high temperature in a solubilization device 6 and the solution after a solubilization treatment is returned to the denitrification device 9 and a gas exhausted from the solubilization device 6 is charged into the nitrification device 8.