JPS5471779A - Back washing type adsorber - Google Patents

Abstract

PURPOSE: To provide the title adsorber having superior performance and capable of long-term operation, by which back washing is made possible by injecting washing water and air into the lower space of an adsorption tower where oil-contg. waste water is supplied from the upper space of a specific vol., passed through an adsorbent layer, and taken out from the lower space as treated water.

CONSTITUTION: While oil-contg. water supplied from piping 4 falls through adsorbent layer 2, the oil is adsorbed, and treated water is discharged from piping 8. Part of the oil coarsened by the adsorbent and drained is gathered in oil chamber 15 and discharged sometimes. When the treatment is continued and the inlet side press. reaches above a fixed value or break-through occurs in the treated water depriving the water of its clarity, back washing is carried out. After drawing the oil from the upper space and chamber 15, the surface of the water in adsorption tower 1 is lowered to the middle between the top of tower 1 and the surface of layer 2, and valve 22 is opened to supply air from the bottom of tower 1, whereby the adsorbent is stirred, expanded, and allowed to flow into the upper space whose vol. is more than 20% of the vol. of layer 2. Valve 20 is then opened to feed back washing water, and the water is drained from valve 7.

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