Method for purification of exhaust air
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United States of America Patent
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Dec 11, 1990
Issued Date -
N/A
app pub date -
Sep 19, 1989
filing date -
Dec 4, 1986
priority date (Note) -
Expired
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Abstract
In a known method for the purification of exhaust air containing impurities which are biologically degradable and difficultly soluble in water, by means of activated sludge washing liquid in an absorption tower, pulverized activated carbon is added to the activated sludge washing liquid. The impurities are initially absorbed by the activated carbon and are subsequently degraded by the microorganisms of the activated sludge. Since the impurities are not transferred directly to the activated carbon, but through the washing liquid, material exchange apparatus having high turbulence are required which have a high energy consumption. By adding a high-boiling, organic solvent, for example, dialkyl phthalate, material exchange apparatus having a low energy consumption can be used, the absorption efficiency is increased and peak loads can be compensated in a buffer-like manner.
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