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dc.contributor.authorMcIntyre, Cameron
dc.date.accessioned2018-05-03T03:45:33Z
dc.date.available2018-05-03T03:45:33Z
dc.date.issued2018-01-15
dc.identifier.urihttps://hdl.handle.net/10182/9310
dc.description.abstractThe discharge of Treated Municipal Wastewater (TMW) into surface waters can degrade water quality and represents a waste of potentially valuable irrigation water and plant nutrients. While the application of TMW to soil can enhance plant growth, TMW containing high sodium (Na) concentrations can degrade soil structure resulting in decreased permeability and increased runoff. TMW from Banks Peninsula, New Zealand is currently discharged into Akaroa Harbour, however, a legal injunction requires that discharge into water be discontinued and therefore land application is being investigated. This thesis aimed to determine whether TMW application to Banks Peninsula soils would result in significant degradation to soil structure. The TMW contained 40 mg/L Na. Soil columns (0.1m x 0.19m) containing the Pawson Silt Loam and intact lysimeters (0.5m x 0.7m) containing both Pawson Silt Loam and Barry’s soil (a silt loam) were irrigated with a total volume of TMW of up to 1500 mm. The TMW irrigated onto the soil columns was spiked with Na up to 325 mg/L. Infiltration occurred unimpeded on all the soils, indicating that irrigating TMW would not degrade soil structure in the short term. Irrigation with TMW resulted in a significant increase in Na in the soil profile (from 330 mg/kg to 1760 mg/kg), however, there was sufficient native Ca and Mg in these soils (6540 mg/kg and 4130 mg/kg) to offset this increased Na. It is likely that in the long term, lime or gypsum will need to be added to maintain soil structure.en
dc.language.isoenen
dc.publisherLincoln Universityen
dc.rights.urihttps://researcharchive.lincoln.ac.nz/page/rights
dc.subjectsoilen
dc.subjectwastewateren
dc.subjectsodiumen
dc.subjectinfiltrationen
dc.subjecttreated municipal wastewateren
dc.subjectTMWen
dc.subjectwastewater treatmenten
dc.subjectBanks Peninsulaen
dc.subjectaggregatesen
dc.titleThe potential of treated municipal wastewater irrigation to cause aggregate instability and pore sealing on Banks Peninsula soils.en
dc.typeThesisen
thesis.degree.grantorLincoln Universityen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Applied Scienceen
lu.thesis.supervisorRobinson, Brett
lu.thesis.supervisorChau, Henry
lu.contributor.unitDepartment of Soil and Physical Sciencesen
dc.subject.anzsrc050305 Soil Physicsen
dc.subject.anzsrc050304 Soil Chemistry (excl. Carbon Sequestration Science)en
dc.subject.anzsrc050205 Environmental Managementen


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