Show simple item record

dc.contributor.authorSmith, Sheryl Diannaen_US
dc.date.accessioned2014-03-14T20:40:01Z
dc.date.available2014-03-14T20:40:01Z
dc.date.issued2001-05-08en_US
dc.identifier.otheretd-06152001-102203en_US
dc.identifier.urihttp://hdl.handle.net/10919/33581
dc.description.abstractA new regulation has been proposed that would lower the acceptable level of arsenic in drinking water from the current standard of 50 ppb. Therefore, research into effective arsenic removal treatment is important, especially for hard to treat waters with high concentrations of silica. The first phase of research was designed to determine if sand ballasted coagulation is a viable means of removing arsenic from drinking water, and if so, to identify the water qualities in which the technology performs best. A jar test protocol was developed and tested on a wide range of waters to compare microsand ballasted coagulation and other coagulation based treatment processes in terms of arsenic removal. Secondary impacts of the microsand process such as residual turbidity, iron, post-treatment membrane filter run length, and TOC removal were also considered as part of this evaluation. Microsand ballasted coagulation provided promising results for many of the simulated groundwater test conditions in which more than 80% of the arsenic regulation costs will be incurred. However, like conventional coagulation/sedimentation, microsand ballasted coagulation performed poorly in waters with high silica and high pH. Thereafter, a second phase of research more closely examined the kinetic behavior of arsenic sorption to amorphous and granular oxides in the presence of silica and calcium. At pH 8.5, calcium dramatically improved arsenic sorption to amorphous iron hydroxide in the presence of silica over short reaction times, but had no long-term advantage. This result could have considerable applications for treatment in that it suggests water quality controls the required reaction times. Additionally, batch tests indicated that activated alumina granular media was more sensitive to water quality than granular ferric hydroxide; however, calcium eliminated silica interference to arsenic sorption onto activated alumina.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartSmithETD.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectkineticsen_US
dc.subjectdrinking wateren_US
dc.subjectarsenicen_US
dc.subjectadsorptionen_US
dc.subjectmicrosanden_US
dc.titleThe Influence of Water Quality on Arsenic Sorption and Treatment Process Performanceen_US
dc.typeThesisen_US
dc.contributor.departmentEnvironmental Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Engineeringen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEnvironmental Planningen_US
dc.contributor.committeechairEdwards, Marc A.en_US
dc.contributor.committeememberDietrich, Andrea M.en_US
dc.contributor.committeememberNovak, John T.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06152001-102203/en_US
dc.date.sdate2001-06-15en_US
dc.date.rdate2002-06-26
dc.date.adate2001-06-26en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record