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Open Access Hypochlorite Conversion Provides Improved Disinfection Safety and Reliability in Portland, OR

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The City of Portland's Columbia Boulevard Wastewater Treatment Plant used gaseous chlorine delivered in railcars to provide disinfection needs. Increasing plant loadings, staff safety training needs, risk management program administrative costs, and safety concerns led the City to proceed in 2003 with design and construction of a bulk hypochlorite system. Construction of the project began in March 2005, and was completed in two phases in July 2006. The project included: removal of the existing gas chlorine system while maintaining continuous disinfection, new bulk sodium hypochlorite storage, pumped transfer of hypochlorite from bulk storage to intermediate loop storage, two continuously pumped recirculating hypochlorite loops to disinfection points, new metering pumps at four disinfection points. The project significantly improved plant and community safety, provided redundancy against disruption of disinfection, and will meet buildout disinfection chemical demands with no further addition of plant chlorination system infrastructure at the plant.
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Keywords: CONVERSION; DISINFECTION; GAS; HYPOCHLORITE; METERING; PERISTALTIC; PORTLAND; RECIRCULATION; STORAGE

Document Type: Research Article

Affiliations: 1: HDR Engineering, Inc., Portland, OR 97204-1134 2: Kennedy/Jenks Consultants, Portland, OR 97204-1134 3: Bureau of Environmental Services, City of Portland, Portland, OR 97204-1134

Publication date: 2007-07-01

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