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Odor control systems are critical to handling and treating foul air in wastewater collection systems and treatment plants. However, odor control systems do not stop corrosion related to biogenic sulfide formation of sulfuric acid as some engineers would have you believe. Conversely if you have an odor problem you also typically have a corrosion problem, and each problem requires separate control strategies.
This paper will address conditions assessment, test procedures and criteria necessary to make informed decisions on overcoating or not overcoating an aged coating system. It will cover rating of adhesion and film integrity, determination of overcoating risk factors and a selection process for appropriate overcoat systems.
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While sewer renewal technologies currently being used for the repair replacement and/or rehabilitation of deteriorating wastewater collection systems are generally effective there is still room for improvement of existing technologies and for the development of new technologies. Many utilities are seeking innovative rehabilitation technologies particularly for large-diameter pipes. However information about these emerging technologies is not always readily available. As part of the U.S. Environmental Protection Agency (USEPA)’s Aging Water Infrastructure Program a field demonstration program of innovative rehabilitation technologies was initiated with the purpose of: (1) gathering reliable performance and cost data for new technologies; and (2) making the capabilities of these technologies better known to the industry. This paper describes the demonstration of an innovative spray-applied fiber-reinforced geopolymer mortar for rehabilitating a 60-in. reinforced concrete pipe approximately 25 ft deep in Houston TX. The demonstration section was 165 ft of severely deteriorated pipe that terminated at a wastewater treatment plant (WWTP). Unique aspects of this project included: (a) the use of an innovative and emerging large-diameter structural rehabilitation technology on a severely deteriorated pipe located beneath a large open stormwater channel; (b) an independent third-party assessment of the technology; and (c) difficult flow control issues at the WWTP.
The choice of technologies is influenced by factors such as material cost, labor cost, regulatory conditions, surface preparation requirements, application conditions, time available for work, environmental exposure, warranties and expected lifetime of the coating. Older technologies such as alkyds may still perform adequately in some applications.