US 5,567,314 A · Apparatus for biologically treating lipid-containing waste water

Abstract

An apparatus for biologically treating lipid-containing waste water comprising a waste water introducer, a biological treatment constituted by a carrier holding a fixed lipid-assimilating, and a discharge for discharging the treated waste water. The carrier has a shape of string, lace, mat, sheet, fiber, sponge or film which facilitates the lipid-assimilating yeast to cling thereto. The apparatus may also be provided with backwashing for the biological treatment carrier, and an aerator for aerating the waste water. It is possible to directly treat lipid-containing waste water without producing any harmful matter and to efficiently reduce the concentration of the lipid (n-hexane extract) to not more than 30 mg/1. Furthermore, the maintenance of the apparatus is easy.

Claims9

Dependent claims

An apparatus for biologically treating lipid-containing waste water comprising:

a tank having a bottom and a top;
an introducing means for introducing lipid-containing waste water into said tank;
an aerating means for aerating said lipid-containing waste water;
an aerobic biological treatment means in said tank constituted by a carrier holding a fixed lipid assimilating yeast wherein said carrier is submerged in a mixture of air and waste water;
a discharging means for discharging the waste water from said tank treated by said biological treatment means
wherein said lipid-assimilating yeast is at least one selected from the group consisting of Candida schatavii N4 strain (FERM P-12768), Candida fluviatilis N6 strain (FERM P-12770), Candida visuwanathii N8 strain (FERM 9-12772), Candida pseudolambica N9 strain (FERM P-12773) and Candida pseudolambica N9 strain (FERM P-12774).

3 more elements

Dependencies are inferred from the claim text.

Apparatus for biologically treating lipid-containing waste water

Life of this patent

Apparatus for biologically treating lipid-containing waste water

Life of this patent

Abstract

Claims9