Evaluation of different powdered activated carbons in the control of chlorite ion
dc.contributor.author | Mitchell, Robert M. | en |
dc.contributor.department | Environmental Engineering | en |
dc.date.accessioned | 2014-03-14T21:40:08Z | en |
dc.date.adate | 2009-07-11 | en |
dc.date.available | 2014-03-14T21:40:08Z | en |
dc.date.issued | 1993 | en |
dc.date.rdate | 2009-07-11 | en |
dc.date.sdate | 2009-07-11 | en |
dc.description.abstract | Twelve different powdered activated carbons (PACs) were screened under laboratory conditions to determine their performance in the removal of chlorite ions (ClO₂⁻) and in the production of chloride ions (Cl⁻) and chlorate ions (ClO₃⁻) during that removal. All screenings were conducted in reagent water, at pH 7.0 ± 0.2 pH units, with a standard concentration of 20 mg/liter of powdered activated carbon (PAC) added in each case, and with the process and samples protected from light. One set of screening experiments was conducted with both ClO₂⁻ and chlorine added with the PAC, while the other set contained only ClO₂⁻, and PAC. The chlorine and ClO₂⁻ were added to concentration levels which might be expected in disinfection practice in water treatment plants. Periodic samples were drawn as the mixtures were stirred over a 24 hour period. Each sample was analyzed for Cl⁻, ClO₂⁻, and ClO₃⁻ concentrations utilizing ion chromatography. All PACs were found to reduce ClO₂⁻ to Cl, and ClO₃⁻ was never detected when chlorine was absent. The data provided no consistent significant evidence of ClO₃⁻ formation even when chlorine was present. The rate of ClO₂⁻ removal was most rapid in the first two hours of contact, but slowed to rates below 6 percent per hour after 4 hours of contact. Rates of ClO₂⁻ removal varied with PAC type. The overall rate of ClO₂⁻ removal was also slower, with the total percentage of ClO₂⁻ removal less, when chlorine was present in the mixture. | en |
dc.description.degree | Master of Science | en |
dc.format.extent | viii, 226 leaves | en |
dc.format.medium | BTD | en |
dc.format.mimetype | application/pdf | en |
dc.identifier.other | etd-07112009-040246 | en |
dc.identifier.sourceurl | http://scholar.lib.vt.edu/theses/available/etd-07112009-040246/ | en |
dc.identifier.uri | http://hdl.handle.net/10919/43659 | en |
dc.language.iso | en | en |
dc.publisher | Virginia Tech | en |
dc.relation.haspart | LD5655.V855_1993.M583.pdf | en |
dc.relation.isformatof | OCLC# 28693567 | en |
dc.rights | In Copyright | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
dc.subject.lcc | LD5655.V855 1993.M583 | en |
dc.subject.lcsh | Carbon, Activated | en |
dc.subject.lcsh | Chlorite minerals | en |
dc.title | Evaluation of different powdered activated carbons in the control of chlorite ion | en |
dc.type | Thesis | en |
dc.type.dcmitype | Text | en |
thesis.degree.discipline | Environmental Planning | en |
thesis.degree.grantor | Virginia Polytechnic Institute and State University | en |
thesis.degree.level | masters | en |
thesis.degree.name | Master of Science | en |
Files
Original bundle
1 - 1 of 1
Loading...
- Name:
- LD5655.V855_1993.M583.pdf
- Size:
- 9.08 MB
- Format:
- Adobe Portable Document Format
- Description: