Total Organic Halogen Formation in the Presence of Iopamidol and Chlorinated Oxidants with and without Natural Organic Matter
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University of Akron / OhioLINK
2014
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=akron1396543573 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-akron13965435732021-08-03T06:23:19Z Total Organic Halogen Formation in the Presence of Iopamidol and Chlorinated Oxidants with and without Natural Organic Matter Ackerson, Nana Osei Bonsu Civil Engineering Environmental Engineering Total organic halogen Iopamidol Natural organic matter chlorine monochloramine Iodate The objectives of this study were to investigate the transformation of ICM as a function of pH (6.5 to 9.5) and time (up to either 72 or 168 hr) in the presence of chlorinated oxidants. Total organic iodide (TOI) loss was used as a surrogate for the ICM. Experiments were performed with and without natural organic matter (NOM). Degradation of TOI in the absence of NOM was carried out at low and high concentrations of iopamidol and aqueous chlorine. Also, the effect of NOM variation on iodate formation was investigated.The TOI degradation and iodate formation at low reactant and buffer concentrations were greatest at pH 7.5 and least at pH 9.5. TOI degradation followed observed first-order kinetics at all pH except pH 6.5, which exhibited bi-phasic degradation kinetics. Iodate formation did not follow either first or second order observed formation and was the predominant iodine-containing species after 24 hr. Furthermore, disinfection by-products (DBPs) formed at pH 6.5 – 8.5 were chloroform, trichloroacetic acid and chlorodiiodomethane. In the presence of monochloramine and in the absence of NOM, the loss of TOI was insignificant and no iodate formation was observed.At high concentrations of iopamidol and aqueous chlorine, TOI loss and iodate formation at pH 6.5 and 8.5 was rapid for the first 24 hr and ceased afterwards. The formation of total organic chloride (TOCl) was initially observed at 6 hr and 2 hr for pH 6.5 and 8.5 respectively. Also, chloroform, dichloroiodomethane, chlorodiiodomethane, dichloroacetic acid and trichloroacetic acid was observed. About 99% of the remaining TOI formed at each discrete time was contained in unidentified iopamidol transformation products.When TOI was monitored in the presence of NOM and aqueous chlorine, source waters from Akron, Barberton and Cleveland respectively recorded 68 to 74%, 62 to 72% and 68 to 77% loss of TOI. However, no iodate was formed in any of the source water experiments. No significant degradation of TOI was observed in the presence of NOM and monochloramine. Iodate was not formed in varying NOM concentrations in Barberton and Cleveland source waters. 2014-05-16 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1396543573 http://rave.ohiolink.edu/etdc/view?acc_num=akron1396543573 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Civil Engineering Environmental Engineering Total organic halogen Iopamidol Natural organic matter chlorine monochloramine Iodate |
| spellingShingle |
Civil Engineering Environmental Engineering Total organic halogen Iopamidol Natural organic matter chlorine monochloramine Iodate Ackerson, Nana Osei Bonsu Total Organic Halogen Formation in the Presence of Iopamidol and Chlorinated Oxidants with and without Natural Organic Matter |
| author |
Ackerson, Nana Osei Bonsu |
| author_facet |
Ackerson, Nana Osei Bonsu |
| author_sort |
Ackerson, Nana Osei Bonsu |
| title |
Total Organic Halogen Formation in the Presence of Iopamidol and Chlorinated Oxidants with and without Natural Organic Matter |
| title_short |
Total Organic Halogen Formation in the Presence of Iopamidol and Chlorinated Oxidants with and without Natural Organic Matter |
| title_full |
Total Organic Halogen Formation in the Presence of Iopamidol and Chlorinated Oxidants with and without Natural Organic Matter |
| title_fullStr |
Total Organic Halogen Formation in the Presence of Iopamidol and Chlorinated Oxidants with and without Natural Organic Matter |
| title_full_unstemmed |
Total Organic Halogen Formation in the Presence of Iopamidol and Chlorinated Oxidants with and without Natural Organic Matter |
| title_sort |
total organic halogen formation in the presence of iopamidol and chlorinated oxidants with and without natural organic matter |
| publisher |
University of Akron / OhioLINK |
| publishDate |
2014 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=akron1396543573 |
| work_keys_str_mv |
AT ackersonnanaoseibonsu totalorganichalogenformationinthepresenceofiopamidolandchlorinatedoxidantswithandwithoutnaturalorganicmatter |
| _version_ |
1719435750443843584 |