| Evidence for Fat, Oil, and Grease (FOG) Deposit Formation Mechanisms in Sewer Lines. | |
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MedLine Citation:
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PMID: 21510691 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The presence of hardened and insoluble fats, oil, and grease (FOG) deposits in sewer lines is a major cause of line blockages leading to sanitary sewer overflows (SSOs). Despite the central role that FOG deposits play in SSOs, little is known about the mechanisms of FOG deposit formation in sanitary sewers. In this study, FOG deposits were formed under laboratory conditions from the reaction between free fatty acids and calcium chloride. The calcium and fatty acid profile analysis showed that the laboratory-produced FOG deposit displayed similar characteristics to FOG deposits collected from sanitary sewer lines. Results of FTIR analysis showed that the FOG deposits are metallic salts of fatty acid as revealed by comparisons with FOG deposits collected from sewer lines and pure calcium soaps. Based on the data, we propose that the formation of FOG deposits occurs from the aggregation of excess calcium compressing the double layer of free fatty acid micelles and a saponification reaction between aggregated calcium and free fatty acids. |
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Authors:
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Xia He; Mahbuba Iasmin; Lisa O Dean; Simon E Lappi; Joel J Ducoste; Francis L de Los Reyes |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-21 |
Journal Detail:
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Title: Environmental science & technology Volume: - ISSN: 1520-5851 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-22 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0213155 Medline TA: Environ Sci Technol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Civil, Construction, and Environmental Engineering, North Carolina State University , Raleigh, North Carolina 27695, United States. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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