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dc.contributor.advisorHill, Robert Len_US
dc.contributor.authorHamrum, Daviden_US
dc.date.accessioned2014-10-16T05:40:44Z
dc.date.available2014-10-16T05:40:44Z
dc.date.issued2014en_US
dc.identifierdoi:10.13016/M2FG75
dc.identifier.urihttp://hdl.handle.net/1903/15924
dc.description.abstractPhosphorus (P) in agricultural runoff is considered a primary contributor to waterway eutrophication. Currently filters made with P-sorbing materials (PSMs) in drainage ditches have been shown to effectively remove P in some situations, but further optimization is necessary. Sorption isotherms were used to determine PSM and temperature effects on P sorption. No effect was found due to temperature, although significant differences were found among the materials used. The different mechanisms of P sorption suggest the retention time used was not suitable for this study. A mesocosm experiment was set up to maximize the flow through filters by mixing gypsum with sand to increase the hydraulic conductivity without sacrificing P sorption. The mixture containing 90% mined gypsum and 10% sand had the highest hydraulic conductivity without a reduction in total P sorption. The mixture containing 80% mined gypsum and 20% sand could have potential as an alternate mixture.en_US
dc.language.isoenen_US
dc.titleTHE EFFECTS OF DRAINAGE DITCH FILTER COMPOSITION ON HYDRAULIC PROPERTIES AND P SORPTIONen_US
dc.typeThesisen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentEnvironmental Science and Technologyen_US
dc.subject.pqcontrolledSoil sciencesen_US
dc.subject.pquncontrolledGypsumen_US
dc.subject.pquncontrolledPhosphorusen_US


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