ITP Filtrate Benzene Removal Alternatives

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Description

Existing ITP filtrate hold tanks may provide sufficient capacity and residence time to strip dissolved benzene from the incoming filtrate using nitrogen sparging in the bottom of the old tanks. This is based on equilibrium supported by late Wash test data using aged washed slurry. Theoretical considerations indicate that benzene stripping will be more difficult from the ITP unwashed high salt filtrates due to reduced mass transfer. Therefore experimental sparging data is needed to quantify the theoretical effects.Foaming limits which dictate allowable sparging rate will also have to be established. Sparging in the hold tanks will require installation of sintered ... continued below

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10 p.

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Dworjanyn, L.O. May 21, 1993.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

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  • Dworjanyn, L.O. Westinghouse Savannah River Company, Aiken, SC (United States)

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Description

Existing ITP filtrate hold tanks may provide sufficient capacity and residence time to strip dissolved benzene from the incoming filtrate using nitrogen sparging in the bottom of the old tanks. This is based on equilibrium supported by late Wash test data using aged washed slurry. Theoretical considerations indicate that benzene stripping will be more difficult from the ITP unwashed high salt filtrates due to reduced mass transfer. Therefore experimental sparging data is needed to quantify the theoretical effects.Foaming limits which dictate allowable sparging rate will also have to be established. Sparging in the hold tanks will require installation of sintered metal spargers, and possibly stirrers and foam monitoring/disengagement equipment. The most critical sparging needs are at the start of the precipitation/concentration cycle, when the filtrate flux rate is the highest,and at the end of wash cycle where Henry`s equilibrium constant falls off,requiring more gas to sparge the dissolved benzene. With adequate recycle (for proper distribution) or sparging in the old tanks, the 30 inch column could be used for the complete ITP process. A courser packing would reduce back pressure while enabling benzene stripping. The Late Wash Tests indicate adequate benzene stripping even at reduced gas flow. This will require experimental verification under ITP conditions. Using the 30 in. column vs 18 in. during the wash cycle will enhance stripping without need for additional sparging provided the minimum flow requirements are met.

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10 p.

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OSTI as DE98058901

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  • Other Information: PBD: 21 May 1993

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  • Other: DE98058901
  • Report No.: WSRC-RP--93-767
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/289660 | External Link
  • Office of Scientific & Technical Information Report Number: 289660
  • Archival Resource Key: ark:/67531/metadc688083

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  • May 21, 1993

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 10, 2016, 2:38 p.m.

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Dworjanyn, L.O. ITP Filtrate Benzene Removal Alternatives, report, May 21, 1993; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc688083/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.