US 5,702,604 AGranted

Apparatus and method for waste water treatment utilizing granular sludge

AssigneeSharp Kabushiki Kaisha

InventorsKazuyuki Yamasaki, Atsushi Yokotani, Shirou Imazu

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Abstract

A wastewater treating apparatus has first, second and third bioreactors. Each bioreactor has, in an upper position, a reaction/sprinkling portion for exhaust gas treatment. The first bioreactor has, in a lower position, a submerged portion including an aerobic upper portion and an anaerobic lower portion. The aerobic upper portion includes a membrane filter. A membrane concentrated liquid produced by the membrane filter is introduced into a mixing tank. A mixture of an alcohol, fine powdered material and membrane concentrated liquid from the mixing tank is introduced, together with a developer-containing wastewater, into the anaerobic lower portion, so that a granular sludge is formed therein. The granular sludge contains anaerobic microorganisms in a high concentration level and is therefore capable of treating the wastewater without necessity of wastewater dilution or use of chemicals.

Claims12

Dependent claims

An apparatus for wastewater treatment, comprising:

a storage tank to which wastewater to be treated is introduced, the storage tank having agitation means;
a first bioreactor having a first wastewater treatment portion which includes an anaerobic portion for anaerobically treating the wastewater introduced from the storage tank and an aerobic portion for aerobically treating the wastewater already treated in the anaerobic portion, wherein the aerobic portion includes a membrane filter and the wastewater passing through the membrane filter is discharged from the first bioreactor;
a mixing tank to which a membrane concentrated liquid produced by the membrane filter in the aerobic portion of the first bioreactor, an alcohol, and fine powered material are introduced to be mixed therein, the mixing tank supplying the resulting mixture to the storage tank;
a second bioreactor having a second wastewater treatment portion for aerobically treating the wastewater received from the first bioreactor, the second wastewater treatment portion containing charcoal and calcium carbonate mineral;
and
means for introducing the wastewater from the storage tank into the first bioreactor, and from the first bioreactor into the second bioreactor.

3 more elements

Dependencies are inferred from the claim text.