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The Helena Wastewater Treatment Plant (WWTP), owned and operated by the City of Helena, Montana, is being upgraded to a 6.2 mgd activated sludge nitrogen removal facility. The upgrade includes replacing the existing chlorination/dechlorination system with an ultraviolet disinfection system.

The most commonly used UV technologies in wastewater disinfection are the low pressure and the medium pressure systems. It is generally accepted that the low pressure system is suitable for small wastewater facilities (3 to 5 mgd) and the medium pressure system is suitable for facilities larger than 10–15 mgd. Plants such as the Helena WWTP have the unique distinction of being in the gray category! Depending on effluent characteristics and project requirements, either system could potentially be used. Therefore, a detailed site-specific evaluation is necessary for system selection.

Due to the limited number of suppliers with significant track record in the two UV technologies, a unique method of procurement was implemented to achieve competitive bidding while ensuring quality of the purchased equipment. A non-proprietary Equipment Procurement Document (EPD) was prepared to pre-purchase the UV system. The document specified both UV systems and required manufacturers to submit specific information to permit the Consultant to perform an objective and detailed evaluation of the systems based criteria important to the project. An evaluation protocol was developed to aid in the assessment. The intent was to provide the City with the most cost effective UV equipment.

The evaluated bid format model described in this paper could be used on other projects to objectively assess competing options, select the preferred option, and purchase the equipment under a competitive bidding environment.

Document Type: Research Article


Publication date: 2000-01-01

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