Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 166, Issue 1, Pages 372-376Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2008.11.028
Keywords
Ammonia; Removal; Air stream; Biogas; Biosolid
Categories
Funding
- IMUS
- Alberta Research Council, Canada
- Scientific Support Program of China [2007BAC18B01]
- Program of Beijing Normal University
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Anew and cost-effective adsorbent N-TRAP, made from waste wood-shavings and anaerobically digestion biosolids and impregnated with H2SO4, was applied for the ammonia removal from airstream and biogas with high efficiency and effectiveness. Bearing a 75-80 and 65 wt.% sulfuric acid, the N-TRAPs mediated with wood shavings and biosolids showed the maximum ammonia adsorption capacity of 260-280 and 230 mg g(-1), respectively. Gas temperatures (20 and 60 degrees C) and moisture content (100% relative humidity) had no significantly negative effect on ammonia capture performance when temperature in the fixed-bed column was kept equalled to or slightly above the feed gas temperature. The pressure drop increased significantly when NH3 began to break through the N-TRAP stripper due to the formation of ammonium sulfate blocking the vacuum space of packed adsorbent. At last, an alternative N-TRAP filter bed design was proposed to resolve the problem of pressure drop evolution. (C) 2008 Elsevier B.V. All rights reserved.
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