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The wide variety of fats, oils, and grease used in food preparation results in a waste that can vary greatly in concentration and required treatment methods. Treatment equipment that is commonly used for separating grease from municipal wastewater was tested against gravity separation to determine the most economical and efficient method of thickening material removed from grease traps. Data was collected from operation of a fractionation tank, dewatering container, dissolved air flotation unit, and grease concentrator. The analytical results as well as operational costs and estimated revenue were then compared to determine the most cost effective method to achieve the desired level of separation. Each of the units considered would be expected to provide positive net revenue for the facility although none of the units achieved all the objectives of the pilot test. However, based on the economic analysis, pilot test results, and subjective evaluations the dewatering container was viewed as the most favorable of the units evaluated. Additional testing is planned prior to the construction of a permanent FOG receiving facility. The future testing will be limited to optimizing the dewatering container to increase the heat of combustion of the thickened FOG while reducing the BOD5 and solids loading on the WPCF.
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Document Type: Research Article

Publication date: 2005-01-01

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