POLLUTANTS
Organic Acidic Gases
Acetic Acid/Formic Acid
Acetic and/or Formic Acid can be readily scrubbed with water or dilute alkali solutions. The
preferred choice will depend upon the concentration of the acid in the gas stream, the removal
efficiency required, the value of recovered dilute acid, and the availability of cooling water
or chilled liquids. Low flow intermittent releases of contaminant are more suited to simple
once-through water systems. More often, however, recirculated alkali is the preferred method
of treatment.
Although Croll-Reynolds’ typically provides counter current packed towers for very high removal
performance our Jet Venturi Fume Scrubbers or CR-5 Multi-Rod Deck Scrubbers alone or in combination
with our packed towers may be used. The combination multi-stage approach is particularly effective
when high concentrations of acid are present and very low gas discharge levels must be achieved.
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Fatty Acids
The odor of released fatty acid vapors can be a significant problem for many food product
manufacturers. However, a counter current packed tower or CR-5 Multi-Rod Deck Scrubber
sometimes combined with a first stage Jet Venturi Scrubber is a very effective means of
treating the odorous gas stream.
In many cases a simple alkali such as sodium hydroxide solution may be used for scrubbing.
In some cases, however, it is more practical and effective to use an oxidizing solution or
even the same fatty acid liquid (at a significantly lower temperature than the gas) for
efficient removal of the fatty acid vapors.
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