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The use of an Aromatic Polyurea lining in an effluent wastewater clarifier tank in Idaho in the Spring of 2017. This clarifier is owned by one of the world’s largest privately held companies with a proven track record in the Wastewater Industry. The clarifier is constructed out of carbon steel for the wall sections with about 4,000 square feet (372 square meters) of surface area. The floor of the clarifier is concrete and was not coated during the project as the coating on the concrete floor was still in good overall condition.
The use of an Aromatic Polyurea lining in an effluent wastewater clarifier tank in Idaho in the Spring of 2017. This clarifier is owned by one of the world’s largest privately held companies with a proven track record in the Wastewater Industry. The clarifier is constructed out of carbon steel for the wall sections with about 4,000 square feet (372 square meters) of surface area. The floor of the clarifier is concrete and was not coated during the project as the coating on the concrete floor was still in good overall condition. The steel walls however had been experiencing prolonged corrosion problems over many years and a solution to the problem needed to be found. In the past the clarifier owner had tried several different lining systems that only provided them with 5-7 years of service life at best before the lining would have to be removed and replaced. This was getting to be too costly, and they looked for a solution that would give them a longer working service life and give added corrosion protection to the steel substrate of the tank walls of the clarifier. It is important that this clarifier has an operation life as long as possible as it is used to treat and reuse water used for washing potatoes and cleaning the processing facility’s equipment. 2.1 million pounds of potatoes is processed every 24 hours at this location with a total of 2 million gallons of water used and processed every 24 hours.
There are several design factors that need to be considered when specifying coatings in water and wastewater concrete structures. Issues include treating surfaces with exposed aggregate, with a low pH, and exposed reinforcing steel. This paper will present three examples of important design considerations based on field experiences that can avert lining performance problems and impacts on a project schedule or budget. Specific examples from a number of projects will be used to illustrate these design considerations.
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This paper will discuss the formulation, use and application of Ultra High Solids and 100 % Solids coatings for internal tank linings. Three case histories demonstrate the use of plural component equipment, Ultra High Solids epoxies and 100 % Solids Polyurea.
During the testing of circular grit chambers in a wastewater treatment plant under construction, serious leaking problems were discovered prior to project completion. After meetings with the Owner, Design and Construction engineering firms, painting contractor and coatings manufacturer, the decision was made to apply 80 mils of pure polyurea to various concrete surfaces. This presentation, through the use of photo images taken during remediation, describes the nature of the problem and how it was solved.