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Surface clogging in an intermittent stratified sand filter.

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dc.contributor.author Rodgers, M.
dc.contributor.author Mulqueen, J.
dc.contributor.author Healy, Mark G.
dc.date.accessioned 2012-04-02T09:21:01Z
dc.date.available 2012-04-02T09:21:01Z
dc.date.issued 2004-06-01
dc.identifier.uri http://hdl.handle.net/10379/2633
dc.description.abstract Accumulation of biomass and deposition of suspended solids at the surface of a sand filter can lead to clogging of the filter media. A laboratory intermittent sand filter column, which included 3 sand strata, was operated for a period of 806 days before failure occurred through surface clogging. Upon dismantling the column, the cause and effects of the surface clogging were investigated. The main mechanism responsible for sand clogging appeared to be biomass build-up. Maximum loss on ignition of filter media samples was 2.35% and it occurred in the upper 0.01 m of the sand. There was a reduction in field-saturated hydraulic conductivity in the top 0.01m of the upper sand stratum from a value of 1.9x10-3±1.7x10-4 m s-1 (for virgin sand with an effective size, d10, of 0.45 mm) to 3.5x10-5±7.5x10-6 m s-1. The soil-water characteristic curve, which relates the volumetric water content, , to the soil suction, also reflected the changes in the filter media due to clogging. The water-holding capacity greatly increased as biomass accumulated in the filter media. Scanning electron microscopy confirmed the existence of a clogging organic layer on the surface of the top sand layer. en_US
dc.format Rodgers, M., Mulqueen, J., Healy, M.G. 2004. Surface clogging in an intermittent stratified sand filter. Soil Science Society of America Journal 68: 1827-1832. en_US
dc.language.iso en_US en_US
dc.publisher Soil Science Society of America Journal en_US
dc.subject Civil Engineering en_US
dc.subject Sand filtration en_US
dc.subject Surface clogging en_US
dc.subject Dairy washwater treatment en_US
dc.title Surface clogging in an intermittent stratified sand filter. en_US
dc.type Article en_US
dc.identifier.doi 10.2136/sssaj2004.1827
dc.local.publishedsource 10.2136/sssaj2004.1827 en_US
dc.description.peer-reviewed peer-reviewed en_US
dc.contributor.funder Teagasc en_US

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