Process for physically and biologically purifying sewage

Details Process for physically and biologically purifying sewage Process for physically and biologically purifying sewage

1974-09-25

1976-02-24

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210150, C02C 104

Patent

active

039403335

ABSTRACT:
A process for physically and biologically purifying sewage. A combination filter-biofilter containing a bed of artificially aerated filler material is used. The sewage is preliminarily clarified and distributed evenly over the filler material and is caused to flow through the latter for a limited time until the sewage has coated the surfaces of the filler material with sludge and microorganisms to an extent that the passage of air through the filler bed is substantially decreased because of encrustation of the interstices of the filler material. At this point the flow of sewage through the filler material is halted and the bulk of the sludge is removed from the filler material by turning the same over with air. Then, the flow of sewage through the filler material is reinstituted. An abrasion resistent filler material is used and for purposes of turning-over the filler material, the bed of the latter is filled with water and the water and the filler material are turned over within the filter-biofilter by means of blown-in compressed air. At the same time the released sludge is drawn off. The turning-over of the filler material and water are accomplished gradually in a horizontal direction through the contents of the filter-biofilter.

REFERENCES:
patent: 3853752 (1974-12-01), Tymoszczuk

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