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Ag-Based Deicing Additives [December 2022]
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2022-06-01
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[PDF-2.80 MB]
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Alternative Title:Comparison of Ag-Based Deicing Additives [Title from Cover]
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Edition:Final Report
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Abstract:The objective of this project is to assist Colorado Department of Transportation (CDOT) in the identification of regionally sourced agricultural co- or by-product deicer additives that will enhance corrosion protection and provide added deicing performance and longevity to road surfaces. A literature review provides a summary of agriculturally derived additives (agbased) that have been used in deicing products, the benefits of incorporating these ag-based additives into deicing products, and potential sources local to Colorado for these products. Based on information gained from literature reviewed, the agricultural products with the greatest potential to serve as locally sourced additives for deicing are sugar beets, corn, and apples. Colorado based industries with the most promising co-products or by-products include the dairy industry, and beer, wine, and distilled alcohol production. Products investigated for further testing included waste cheese brine, apple pomace, and by-products from regional beer and cider production. Cheese brine was the only ag-based product in which further testing was performed. Laboratory analysis of the Leprino cheese brine (LCB) determined it functions as a deicer, because it is a sodium chloride-based product, that provides some corrosion protection. A beneficial use permit was granted by CDPHE to Leprino Foods for the use of LCB by CDOT as a pre-wetting agent for field trial applications. LCB must only be applied at 8 gal/ton to pre-wet salt or salt sand and can only be applied in the defined field trail locations in Fort Morgan and Greeley, CO. Initial field trail results suggest training before the 2022-2023 winter season is needed to support use of LCB in winter operations. Future work will consider improvements to LCB to reduce the phosphorus concentration, support data collection and analysis from field trials, and investigate other regionally sourced ag-based additives that could be used by CDOT in deicing operations.
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