Abstract
The presence of abnormally high levels of the radioactive isotope of iodine, {sup 125}I, has been discovered in the thyroid glands taken from swans found on the Rivers Thames and Trent. The sources of activity have been traced to sewage outfalls into the rivers. It has been postulated that the {sup 125}I enters the system from local hospitals and research establishments where radio-labelled proteins are produced. The chemical nature of the iodine depends upon the conditions to which it is exposed. The work described in this report has involved the development of two techniques, ultrafiltration and electrochemical ion exchange, for the removal of active iodine/iodate from aqueous wastes. The report also contains details relating to an electrochemical flow cell designed to convert iodate to iodide prior to ultrafiltration treatment. A comparison is then made between the two techniques. The initial target of decontamination factor of 10 has been exceeded by both methods. The consideration of solution pH and ion selectivity has resulted in the design and demonstration of a single CAEIX cell capable of attaining decontamination factors in excess of 33. The filtration technique requires a two stage precipitation using calcium ions to remove free phosphate and then silver ions
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Jones, C P;
[1]
Kavanagh, P R;
Turner, A D
[2]
- AEA Decommissioning and Radwaste, Harwell (United Kingdom)
- AEA Industrial Technology, Harwell (United Kingdom)
Citation Formats
Jones, C P, Kavanagh, P R, and Turner, A D.
Removal of active iodine/iodate from liquid wastes.
United Kingdom: N. p.,
1992.
Web.
Jones, C P, Kavanagh, P R, & Turner, A D.
Removal of active iodine/iodate from liquid wastes.
United Kingdom.
Jones, C P, Kavanagh, P R, and Turner, A D.
1992.
"Removal of active iodine/iodate from liquid wastes."
United Kingdom.
@misc{etde_10151913,
title = {Removal of active iodine/iodate from liquid wastes}
author = {Jones, C P, Kavanagh, P R, and Turner, A D}
abstractNote = {The presence of abnormally high levels of the radioactive isotope of iodine, {sup 125}I, has been discovered in the thyroid glands taken from swans found on the Rivers Thames and Trent. The sources of activity have been traced to sewage outfalls into the rivers. It has been postulated that the {sup 125}I enters the system from local hospitals and research establishments where radio-labelled proteins are produced. The chemical nature of the iodine depends upon the conditions to which it is exposed. The work described in this report has involved the development of two techniques, ultrafiltration and electrochemical ion exchange, for the removal of active iodine/iodate from aqueous wastes. The report also contains details relating to an electrochemical flow cell designed to convert iodate to iodide prior to ultrafiltration treatment. A comparison is then made between the two techniques. The initial target of decontamination factor of 10 has been exceeded by both methods. The consideration of solution pH and ion selectivity has resulted in the design and demonstration of a single CAEIX cell capable of attaining decontamination factors in excess of 33. The filtration technique requires a two stage precipitation using calcium ions to remove free phosphate and then silver ions to precipitate iodide. The rather high solids production of at least 10g/dm{sup 3} of treated waste is, to an extent, offset by the high DF value obtained, 174. (Author).}
place = {United Kingdom}
year = {1992}
month = {Dec}
}
title = {Removal of active iodine/iodate from liquid wastes}
author = {Jones, C P, Kavanagh, P R, and Turner, A D}
abstractNote = {The presence of abnormally high levels of the radioactive isotope of iodine, {sup 125}I, has been discovered in the thyroid glands taken from swans found on the Rivers Thames and Trent. The sources of activity have been traced to sewage outfalls into the rivers. It has been postulated that the {sup 125}I enters the system from local hospitals and research establishments where radio-labelled proteins are produced. The chemical nature of the iodine depends upon the conditions to which it is exposed. The work described in this report has involved the development of two techniques, ultrafiltration and electrochemical ion exchange, for the removal of active iodine/iodate from aqueous wastes. The report also contains details relating to an electrochemical flow cell designed to convert iodate to iodide prior to ultrafiltration treatment. A comparison is then made between the two techniques. The initial target of decontamination factor of 10 has been exceeded by both methods. The consideration of solution pH and ion selectivity has resulted in the design and demonstration of a single CAEIX cell capable of attaining decontamination factors in excess of 33. The filtration technique requires a two stage precipitation using calcium ions to remove free phosphate and then silver ions to precipitate iodide. The rather high solids production of at least 10g/dm{sup 3} of treated waste is, to an extent, offset by the high DF value obtained, 174. (Author).}
place = {United Kingdom}
year = {1992}
month = {Dec}
}