Ammonia removal from air stream and biogas by a H2SO4 impregnated adsorbent originating from waste wood-shavings and biosolids.
A new and cost-effective adsorbent N-TRAP, made from waste wood-shavings and anaerobically digestion biosolids and impregnated with H(2)SO(4), was applied for the ammonia removal from air stream 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 NH(3) 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.
Guo
Xuejun Jack
XJ
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. guoxj21@yahoo.com.cn
Tak
Jin Kwon
JK
Johnson
Richard L
RL
D000327:Adsorption; D000388:Air / Q000032:analysis; D000641:Ammonia / Q000302:isolation & purification*; D018533:Biomass; D019411:Clinical Laboratory Techniques; D004867:Equipment Design; D005740:Gases / Q000032:analysis; D007220:Industrial Waste / Q000517:prevention & control; D012037:Refuse Disposal / Q000379:methods*; D013464:Sulfuric Acids; D014934:Wood / Q000737:chemistry
D005740:Gases; D007220:Industrial Waste; D013464:Sulfuric Acids; D000641:Ammonia; C033158:sulfuric acid