Patent ID: 7972502

Claim:
An aeration-less water treatment apparatus comprising: an anaerobic treatment tank which receives sewage fed by a pump through a bottom of the tank to cause the sewage to flow as an upward stream so that the sewage contacts anaerobic microorganisms to anaerobically treat polluted matter in the sewage; an aerobic treatment tank which receives treated water from the anaerobic treatment tank at a top of the aerobic treatment tank to cause the treated water to flow as a downward stream and supplies the treated water to atmospheric pressure air by means of free fall so that the treated water contacts aerobic microorganisms and air to aerobically treat the polluted matter in the treated water; a suspended sludge section located in a lower part of the anaerobic treatment tank, having an initial amount of anaerobic microorganisms that become suspended in the sewage, the suspended sludge section being configured to perform a primary biological treatment of the sewage; and a carrier section located in an upper part of the anaerobic treatment tank, having carriers, supported by a carrier support section, to which the anaerobic microorganisms are attached, the carrier section being configured to perform a secondary treatment of the sewage, the anaerobic microorganisms having flowed from the suspended sludge section being further attached to the carriers which prevent the anaerobic microorganisms from flowing out from the anaerobic treatment tank into the aerobic treatment tank.