Full Description

The Orange County Water District (OCWD) carried out a competitive bid for antiscalant in 2005 for its5 mgd interim (Phase 1) facility, in anticipation of the 70 mgd RO capacity Groundwater Replenishment(GWR) System, currently under construction. The OCWD competitive bid included an additionalrefinement beyond assessing the lowest annual cost and demonstration-based performance testing. Inaddition to providing an antiscalant product and dosage, the vendors were required to provide a feed pHsetpoint that would allow optimal performance of the bid antiscalant product in preventing scaleformation within the RO system. The consumption rate of acid was included in the determination of lowbid by calculation of an annual cost of antiscalant and acid.The focus of this paper is on documenting the antiscalant procurement process employed at OCWD. Thisprocurement process not only demonstrated successful performance of the low-bid product prior toimplementation on the full-scale RO system, but also resulted in optimized acid consumption andsignificantly reduced chemical costs. It is estimated that implementing the low-bid product will saveOCWD over $1,500,000 annually in antiscalant and sulfuric acid costs, with potentially more savingsrelated to stabilization of the final product. Includes 6 references, tables, figures.

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Edition: Vol. - No. Published: 03/01/2007 Number of Pages: 15File Size: 1 file , 640 KB