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By Randy Nixon, Corrosion Probe, Inc.
Presented at SSPC 2015; Session: Mini Session: Corrosion in Concrete; Session chair: Bob Murphy, The Sherwin-Williams Company
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Protective coatings are used in anaerobic digesters for both corrosion protection and for gas tightness. Digesters, if properly operated, are not corrosive to either concrete or carbon steel substrates. This presentation will explain the basics of how digesters work chemically and demonstrate the conditions under which corrosion does occur when the operating conditions are not controlled adequately. When this is the case, the right protective coating system is of paramount importance as the conditions are extremely corrosive. This presentation will also describe the author’s experience with the various types of biosolids digesters including floating steel covered, fixed steel and concrete covered, German style, and egg shaped vessels. Through this examination of the digester types, the commonplace corrosion problems will be identified along with the appropriate criterion for selecting protective coating systems.
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