Show simple item record

dc.contributor.authorAiken, Anne M.en_US
dc.date.accessioned2014-03-14T21:49:00Z
dc.date.available2014-03-14T21:49:00Z
dc.date.issued1990-04-05en_US
dc.identifier.otheretd-11072008-063149en_US
dc.identifier.urihttp://hdl.handle.net/10919/45453
dc.description.abstract

The major objectives of this study were to investigate the effects of seasonal changes in Lake Manassas and its watershed (late winter to late summer), the impoundment of Broad Run, and the stratification of Lake Manassas on trihalomethane (THM)-precursors in Broad Run, upstream and downstream of the reservoir, and in Lake Manassas. An additional objective was to determine the molecular-size distributions of the dissolved organic carbon, and the THM precursors of the organic carbon pool in Lake Manassas during stratification.

Raw water samples were collected from March through August on Broad Run immediately upstream of the reservoir, at two sites in the reservoir-- one approximately 0.27 miles from the dam and the second, at a more central location, 0.73 miles from the dam, and on Broad Run 2.81 miles below the dam. During stratification two samples were collected from each lake site-- one from the epilimnion, and the second from the hypolimnion. All of the samples were size fractionated by ultrafiltration and chlorinated for determination ofTHMFP. The differences in THMprecursor characteristics were determined by assessing the differences in the total organic carbon (TOC) concentrations and THM-formation potentials (THMFPs) of the various size fractions.

The TOe and THM concentrations generally increased from late winter to late summer at all stations. The concentrations in Lake Manassas and in Broad Run below the dam were consistently higher than those observed in Broad Run upstream of the lake, indicating that impoundment causes an increase in levels of THM precursors. In addition, during stratification higher THM yields were produced by the predominantly low-molecular-weight precursors « 5,000) in the epilimnion of Lake Manassas, while the predominantly high-molecular-weight precursors (> 5,000 daltons) were low-yielding-THM precursors.

en_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V855_1990.A363.pdfen_US
dc.subjectWateren_US
dc.subject.lccLD5655.V855 1990.A363en_US
dc.titleThe effects of seasonal change, impoundment, and stratification on trihalomethane precursorsen_US
dc.typeThesisen_US
dc.contributor.departmentEnvironmental Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEnvironmental Planningen_US
dc.contributor.committeechairHoehn, Robert C.en_US
dc.contributor.committeememberGrizzard, Thomas J.en_US
dc.contributor.committeememberNovak, John T.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11072008-063149/en_US
dc.date.sdate2008-11-07en_US
dc.date.rdate2008-11-07
dc.date.adate2008-11-07en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record