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Assessment of intermittently loaded woodchip and sand filters to treat dairy soiled water

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dc.contributor.author Murnane, John G.
dc.contributor.author Brennan, R.B.
dc.contributor.author Healy, M.G.
dc.contributor.author Fenton, O.
dc.date.accessioned 2016-08-11T08:50:32Z
dc.date.issued 2016
dc.identifier.uri http://hdl.handle.net/10344/5142
dc.description peer-reviewed en_US
dc.description.abstract Land application of dairy soiled water (DSW) is expensive relative to its nutrient replacement value. The use of aerobic filters is an effective alternative method of treatment and potentially allows the final effluent to be reused on the farm. Knowledge gaps exist concerning the optimal design and operation of filters for the treatment of DSW. To address this, 18 laboratory-scale filters, with depths of either 0.6 m or 1 m, were intermittently loaded with DSW over periods of up to 220 days to evaluate the impacts of depth (0.6 m versus 1 m), organic loading rates (OLRs) (50 versus 155 g COD m 2 d 1), and media type (woodchip versus sand) on organic, nutrient and suspended solids (SS) removals. The study found that media depth was important in contaminant removal in woodchip filters. Reductions of 78% chemical oxygen demand (COD), 95% SS, 85% total nitrogen (TN), 82% ammonium-nitrogen (NH4eN), 50% total phosphorus (TP), and 54% dissolved reactive phosphorus (DRP) were measured in 1 m deep woodchip filters, which was greater than the reductions in 0.6 m deep woodchip filters. Woodchip filters also performed optimally when loaded at a high OLR (155 g COD m 2 d 1), although the removal mechanism was primarily physical (i.e. straining) as opposed to biological. When operated at the same OLR and when of the same depth, the sand filters had better COD removals (96%) than woodchip (74%), but there was no significant difference between them in the removal of SS and NH4eN. However, the likelihood of clogging makes sand filters less desirable than woodchip filters. Using the optimal designs of both configurations, the filter area required per cow for a woodchip filter is more than four times less than for a sand filter. Therefore, this study found that woodchip filters are more economically and environmentally effective in the treatment of DSW than sand filters, and optimal performance may be achieved using woodchip filters with a depth of at least 1 m, operated at an OLR of 155 g COD m 2 d 1. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Water Research;103, pp. 408-415
dc.relation.uri http://dx.doi.org/10.1016/j.watres.2016.07.067
dc.rights This is the author’s version of a work that was accepted for publication in Water Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Water Research, 103, pp. 408-415, http://dx.doi.org/10.1016/j.watres.2016.07.067 en_US
dc.subject passive filtration en_US
dc.subject woodchip en_US
dc.subject sand en_US
dc.subject dairy soiled water en_US
dc.subject organic loading rate en_US
dc.title Assessment of intermittently loaded woodchip and sand filters to treat dairy soiled water en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.watres.2016.07.067
dc.date.embargoEndDate 2018-07-31
dc.embargo.terms 2018-07-31 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2650123


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