How It Works Volatile Fatty Acids © 2014 ZAPS Technologies Inc. Volatile Fatty Acid (VFA) Monitoring with the LiquID ™Station VOLATILE FATTY ACIDS Volatile fatty acids ( V FA’ s) such as acetic, formic, and butyric acid are byproducts of anaerobic bacterial digestion of organic matter and hence are a common constituent of wastewater process streams and sludge. The sodium (Na) and potassium (K) salts of VFA’s (specificall

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