Apparatus and method for waste water treatment utilizing aerobic and anaerobic microorganisms and capable of exhaust gas treatment

A method for waste water treatment comprising the steps of:

• introducing waste water to be treated into a lower portion of a first bioreactor via an inflow pipe, anaerobically treating the water in that lower portion, then directing the water under treatment to an upper portion of the first bioreactor;
• operating and stopping an aeration means provided in the lower portion of the first bioreactor to temporarily produce microbial conditions in which anaerobic and aerobic microorganisms are present in mixture, and treating the water under the mixed microbial conditions;
• and
• introducing the water under treatment from the first bioreactor into a second bioreactor to permit the water to be introduced into a contact circulation portion of the second bioreactor, thereby allowing the water to come into contact with charcoal and calcium carbonate fillers which are present in the contact circulation portion.

An apparatus for waste water treatment comprising:

• a first bioreactor having a first upper wetting portion in which charcoal and plastic fillers are packed and through which exhaust gas passes upward from below, and a first lower submerged portion in which vinylidene chloride fillers are packed, an air supply agitation means is placed near the vinylidene chloride fillers, and an introduction pipe for introducing waste water to be treated and a sludge separation diffuser are provided below the vinylidene chloride fillers;
• a second bioreactor having a second upper wetting portion in which charcoal and plastic fillers are packed, and through which exhaust gas passes upward from below, a second lower submerged portion in which charcoal and calcium carbonate mineral are packed, and an introduction means for introducing the waste water from the first lower submerged portion of the first bioreactor into the second lower submerged portion;
• a denitrification tank having an introduction means for introducing the waste water from the second lower submerged portion of the second bioreactor into the tank and a circulating means for circulating the introduced waste water;
• a third bioreactor having a third upper wetting portion in which charcoal and plastic fillers are packed and through which exhaust gas is passed from below to above, a third lower submerged portion in which charcoal and calcium carbonate mineral are packed, and an introduction means for introducing the water from the denitrification tank into the third lower submerged portion;
• a precipitation tank in which the waste water received from the third submerged portion of the third bioreactor is separated into solid and liquid, supernatant liquid being discharged from the precipitation tank, the precipitation tank having a sludge return means for returning sludge precipitated by the solid-liquid separation to the first upper wetting portion of the first bioreactor, the second upper wetting portion of the second bioreactor, and the third upper wetting portion of the third bioreactor.

A method for treating nitrogen-containing waste by-products, the method comprising:

• (1) introducing waste water to be treated into a first portion of a first bioreactor;
• (2) creating an anaerobic condition in the first portion of the first bioreactor and using anaerobic microorganisms in the first portion of the first bioreactor to digest organic substances contained in the waste water;
• then
• (3) creating an aerobic condition in a second portion of the first bioreactor and using aerobic microorganisms in the second portion of the first bioreactor to oxidize the waste water;
• then
• (4) temporarily creating a condition in the second portion of the first bioreactor wherein both anaerobic and aerobic microorganisms are present in the second portion of the first bioreactor, and wherein the waste water is denitrified by the anaerobic microorganisms.