The disposal treatment facility is an integration facility combining individual treatment facilities. The combination and the placement of each facility is determined under various conditions (i.e., water quality of inflowing water, condition of the place of discharge, conditions of the restrictions of sludge treatment, etc.), which each facility faces.
Most of Japanfs sewerage treatment is biological treatment. The biological treatment method is separated into plankton method and sessile organism method (biofilm method) and most sewerage treatment plants adopt the plankton method (activated sludge method).
It is a method that decomposes organic matter by creating a cluster of microorganisms (activated sludge) that floats within sewerage water.
It is a method that decomposes organic matter by generating a biological slime on the surface of the solid floating layer and having it come in contact with sewerage water.
Plankton method | Standard activated sludge method |
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Circulation denitrification method (denitrification) | |
Anaerobic anoxic aerobic method (nitrogen/phosphorus removal) | |
Anaerobic aerobic activated sludge method (phosphorus removal) | |
Oxygen activated sludge method | |
Oxidation Ditch method (OD method) | |
Prolonged aeration method | |
Batch-wise activated sludge method | |
Sessile organism method (biofilm method) | Contact oxidation method |
Aerobic filter method |
The sludge created in the process of water treatment is downsized and stabilized through treatments such as concentration, digestion, dehydration, incineration, etc.