The Removal of Ammonia from Water by a Hydrophobic Catalyst
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- 作者：Tung-Li Huang ; Keith R. Cliffe ; and Jordan M. MacInnes
- 刊名：Environmental Science & Technology
- 出版年：2000
- 出版时间：November 15, 2000
- 年：2000
- 卷：34
- 期：22
- 页码：4804 - 4809
- 全文大小：112K
- 年卷期：v.34,no.22(November 15, 2000)
- ISSN：1520-5851
文摘
Owing to the worldwide emphasis on eutrophicationproblem and the toxic property of ammonia on the aquaticliving, the discharge of ammonia-containing water toaquifers is intensely focused. The ammonia containingwaste produced in industries is usually characterized byhigh concentration and high temperature and is not treatableby biological methods directly. In this study, a processhas been developed to remove ammonia from water bystripping ammonia from the aqueous phase followed by thegas-phase oxidation of ammonia over a Pt/SDB hydrophobiccatalyst. An equation of the form r = kPNH3mPO2n modeledthe reaction, the reaction order in ammonia was 1.4 and inoxygen was 0.6, and the activation energy was 17400 cal/mol in a gas reaction system, whereas the reactionorder of ammonia in a trickle-bed reactor was 0.8, andthe activation energy was 10131 cal/mol. The difference wasdue to the presence of water in the trickle-bed reactor.Combining the equilibrium reactions of ammonia in water(KNH4+, KH2O), the NH3 equilibrium between the gas andliquid phase (HNH3), and the reaction kinetics of ammoniaoxidation (r = kPNH3mPO2n), a model of M/F0 = [0.0435 exp(-10131/RT)]-1PO2-0.6
H-0.8[2KNH4+C02(1 - x)2/(KH2O +
]-0.8 dx was established todescribe the ammonia removal in the trickle-bed reactor.
H-0.8[2KNH4+C02(1 - x)2/(KH2O +]-0.8 dx was established todescribe the ammonia removal in the trickle-bed reactor.