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A four month pilot study of two membrane systems was conducted on secondary effluent to evaluate their effectiveness and cost for Denver's new 30 mgd water reclamation plant. An immersed, vacuum-driven, ultrafiltration membrane system (Zenon Environmental Systems) and a pressure-driven microfiltration membrane system (Pall Corporation) were tested to determine the performance of the membrane systems with regards to the required water quality goals and to determine each membrane system's optimum operating parameters to be utilized for full-scale pricing and design.

The Zenon membrane system operated successfully at 32 gfd and the Pall system operated successfully at 40 gfd. The addition of ferric chloride to the feed water, which was required to precipitate and remove phosphorus from the flow stream, significantly improved the performance of both membrane systems. After the initial phase of pilot testing was completed, a present worth cost evaluation was conducted comparing a conventional, highrate filtration treatment system to the Pall and Zenon membranes. Membrane costs were 20% to 60% higher than conventional filtration for this application.
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Document Type: Research Article

Publication date: 2000-01-01

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