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Treatability Study of Mixed Waste Using Ion Exchange Resins

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Treatability Study of Mixed Waste Using Ion Exchange Resins Ilham AlMahamid Brian M. Smith Lawrence Berkeley National Laboratory EIChroM Users Group Workshop ... – PowerPoint PPT presentation

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Title: Treatability Study of Mixed Waste Using Ion Exchange Resins


1
Treatability Study of Mixed Waste Using Ion
Exchange Resins
  • Ilham AlMahamid
  • Brian M. Smith
  • Lawrence Berkeley National Laboratory
  • EIChroM Users Group Workshop, Pleasanton, CA,
    May 25, 1999

2
Experimental Objective
  • By employing innovative treatment technology,
    meet Land Disposal Restriction waste treatment
    standards and provide a disposal option for 105
    gallons of mixed waste generated by
    neutralization and consolidation of corrosive
    mixed wastes from past LBNL research.

3
Waste Description
  • Multiphase (solid, organic and aqueous)
  • Presence of regulated metals such as chromium,
    lead and mercury at concentrations that render
    the waste combustion prohibited.
  • Presence of regulated solvents such as
    chloroform, acetone, and methylene chloride that
    make combustion the appropriate treatment method.

4
Waste Characterization, R12
5
Waste Characterization, R12
6
Waste Characterization, R13
7
Waste Characterization for R13
8
Waste Characterization, R21
9
Waste Characterization, R21
10
Experimental Approach
  • Conduct a treatability study to reduce the
    concentrations of regulated metals to levels that
    would remove any combustion prohibition.
  • Chromium 2.77 mg/L Note Chromium target in
  • Mercury 0.15 mg/L R12 is 1,350 mg/L because
  • Lead 0.69 mg/L only half of the 2,700 mg/L
  • Silver 0.43 mg/L is combustion prohibited.

11
METHODS
  • Separate the organic layer (scrape off top)
  • Separate the sludge (vacuum filtration)
  • Treat the aqueous phase (resin exchange)

12
Treatment of the Aqueous Phase
  • Literature review of resins used to remove
    actinides and heavy metals from wastes
  • Diphonix, Radaway, and apatite were selected for
    further testing

13
Bench-Scale Studies
  • Diphonix resin, Radaway slurry, and apatite were
    added to aliquots of the waste.
  • Resin to waste ratio was 5 g / 50 mL.
  • Vials were placed on a shaking table (100 rpm)
    for 24 hours at room temperature.
  • Solutions were filtered and analyzed for
    actinides and metals.
  • Diphonix had high uptake and was easy to handle.

14
Treatment of R12
  • Chromium (2,700 mg/L) was determined to be in two
    forms Cr(III) and Cr(VI) as chromate from
    chromic acid
  • Precipitate chromate by addition of BaCl2.
  • Reduced Cr concentration to 400 mg/Liter
  • Solution turned from orange to very light yellow.
  • Filtered to remove solids (barium chromate
    barium sulfate).
  • Passage through the ion-exchange columns.

15
Semi-Pilot Scale Treatment
  • The set-up consists of
  • peristaltic pump
  • on-line filter
  • series of six columns, three containing diphonix
    resin (cationic exchanger) and three containing
    anionic exchanger.

16
(No Transcript)
17
Results
18
Results (continued)
19
Conclusions
  • The treatment study removed regulated metals to
    allow combustion as a disposal option for 105
    gallons of aqueous mixed waste.
  • Diphonix is useful in removal of metals and
    actinides from aqueous radioactive wastes.
  • Small amounts of organics such as acetone did not
    diminish the efficiency of the resin.
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