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Design Considerations for Corrosion Protection of Anaerobic Digesters in Wastewater Trestmant Plants

Protective coatings are used in anaerobic digesters to achieve both corrosion protection and gas tightness. With respect to the need for corrosion protection, anaerobic digesters, under typical operating conditions, do not create exposures which are corrosive to either carbon steel or concrete substrates. This paper will explain the basics of how anaerobic digesters work chemically to stabilize biosolids and demonstrate the atypical operating conditions under which corrosion becomes problematic. 

Product Number: 41215-916-SG
Author: R. A. Nixon
Publication Date: 2015
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Protective coatings are used in anaerobic digesters to achieve both corrosion protection and gas tightness. With respect to the need for corrosion protection, anaerobic digesters, under typical operating conditions, do not create exposures which are corrosive to either carbon steel or concrete substrates. This paper will explain the basics of how anaerobic digesters work chemically to stabilize biosolids and demonstrate the atypical operating conditions under which corrosion becomes problematic. This involves unintended or unexpected process upsets in existing digesters as well as anticipated, short-lived start-up conditions in new digesters. When these inadvertent or predictable corrosive exposures occur, selection of the right protective coating system is of paramount importance. This paper will describe its author's experience with corrosion and coatings in various types of anaerobic digesters including concrete vessels with steel floating covers, concrete and steel vessels with fixed covers, and egg shaped digesters. Through the examination of project learnings from specific digester types, commonplace corrosion and coatings performance problems will be identified along with recommended criterion for selecting appropriate protective coating systems. Furthermore, the selection of protective coatings to ensure digester gas tightness will be discussed.

Protective coatings are used in anaerobic digesters to achieve both corrosion protection and gas tightness. With respect to the need for corrosion protection, anaerobic digesters, under typical operating conditions, do not create exposures which are corrosive to either carbon steel or concrete substrates. This paper will explain the basics of how anaerobic digesters work chemically to stabilize biosolids and demonstrate the atypical operating conditions under which corrosion becomes problematic. This involves unintended or unexpected process upsets in existing digesters as well as anticipated, short-lived start-up conditions in new digesters. When these inadvertent or predictable corrosive exposures occur, selection of the right protective coating system is of paramount importance. This paper will describe its author's experience with corrosion and coatings in various types of anaerobic digesters including concrete vessels with steel floating covers, concrete and steel vessels with fixed covers, and egg shaped digesters. Through the examination of project learnings from specific digester types, commonplace corrosion and coatings performance problems will be identified along with recommended criterion for selecting appropriate protective coating systems. Furthermore, the selection of protective coatings to ensure digester gas tightness will be discussed.

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