Catalytic Denitrification in a Trickle Bed Reactor: Ion Exchange Waste Brine Treatment

Catalytic reduction of nitrate in ion exchange (IX) waste brine for reuse is a promising option for reducing IX costs and environmental impacts. A recycling trickle bed reactor (TBR) was designed and optimized using 0.5 percent by weight (wt%) palladium–0.05 wt% indium catalysts supported on US mesh...

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Bibliographic Details
Published in:Journal - American Water Works Association 2017-05, Vol.109 (5), p.E129-E143
Main Authors: BERGQUIST, ALLISON M., BERTOCH, MADISON, GILDERT, GARY, STRATHMANN, TIMOTHY J., WERTH, CHARLES J.
Format: Article
Language:English
Subjects:
Activated carbon
Activated Carbon Treatment
brine reuse
Brines
Catalysis
Catalysts
Catalytic activity
Costs
Denitrification
drinking water treatment
Environmental impact
Indium
Ion exchange
Mass Transfer
Palladium
palladium‐indium
Peer Reviewed
Reactors
Reuse
Saline water
trickle bed reactor
Velocity
Waste treatment
Water treatment
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Summary:Catalytic reduction of nitrate in ion exchange (IX) waste brine for reuse is a promising option for reducing IX costs and environmental impacts. A recycling trickle bed reactor (TBR) was designed and optimized using 0.5 percent by weight (wt%) palladium–0.05 wt% indium catalysts supported on US mesh size 12 × 14 or 12 × 30 activated carbon particles. Various liquid superficial velocities (Ur) and hydrogen gas superficial velocities (Ug-H2) were evaluated to assess performance in different flow regimes; catalyst activity increased with Ug-H2 at all Ur for both catalysts and was greatest for the 12 × 30 catalyst at the lowest Ur (8.9 m/h). The 12 × 30 catalyst demonstrated up to 100% higher catalytic activity and 280% higher mass transfer rate compared with the 12 × 14 catalyst. Optimal TBR performance was achieved with both catalysts in the trickle flow regime. The results indicate that the TBR is a promising step forward, and continued improvements are possible to overcome remaining mass transfer limitations.
ISSN:0003-150X
1551-8833
DOI:10.5942/jawwa.2017.109.0055