Removal of ammonia solutions used in catalytic wet oxidation processes

被引:67
作者
Hung, CM [1 ]
Lou, JC [1 ]
Lin, CH [1 ]
机构
[1] Natl Sun Yat Sen Univ, Inst Environm Engn, Kaohsiung 80424, Taiwan
关键词
catalytic wet oxidation; ammonia; trickle-bed reactor; Cu/La/Ce composite catalyst;
D O I
10.1016/S0045-6535(03)00303-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Ammonia (NH3) is an important product used in the chemical industry, and is common place in industrial wastewater. Industrial wastewater containing ammonia is generally either toxic or has concentrations or temperatures such that direct biological treatment is unfeasible. This investigation used aqueous solutions containing more of ammonia for catalytic liquid-phase oxidation in a trickle-bed reactor (TBR) based on Cu/La/Ce composite catalysts, prepared by co-precipitation of Cu(NO3)(2), La(NO3)(2), and Ce(NO3)(3) at 7:2:1 molar concentrations. The experimental results indicated that the ammonia conversion of the wet oxidation in the presence of the Cu/La/Ce composite catalysts was determined by the Cu/La/Ce catalyst. Minimal ammonia was removed from the solution by the wet oxidation in the absence of any catalyst, while approximately 91% ammonia removal was achieved by wet oxidation over the Cu/La/Ce catalyst at 230 degreesC with oxygen partial pressure of 2.0 MPa. Furthermore, the effluent. streams were conducted at a liquid hourly space velocity of under 9 h(-1) in the wet catalytic processes, and a reaction pathway was found linking the oxidizing ammonia to nitric oxide, nitrogen and water. The solution contained by-products, including nitrates and nitrites. Nitrite selectivity was minimized and ammonia removal maximized when the feed ammonia solution had a pH of around 12.0. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:989 / 995
页数:7
相关论文
共 15 条
  • [1] Nitrous oxide emissions and the anthropogenic nitrogen in wastewater and solid waste
    Barton, PK
    Atwater, JW
    [J]. JOURNAL OF ENVIRONMENTAL ENGINEERING, 2002, 128 (02) : 137 - 150
  • [2] Removal of nitrogenous compounds by catalytic wet air oxidation. Kinetic study
    Deiber, G
    Foussard, JN
    Debellefontaine, H
    [J]. ENVIRONMENTAL POLLUTION, 1997, 96 (03) : 311 - 319
  • [3] Supercritical water oxidation of NH3 over a MnO2/CeO2 catalyst
    Ding, ZY
    Li, LX
    Wade, D
    Gloyna, EF
    [J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1998, 37 (05) : 1707 - 1716
  • [4] ECKENFELDER WW, 1980, PRINCIPLES WATER QUA
  • [5] The removal of ammonia from water by a hydrophobic catalyst
    Huang, TL
    Cliffe, KR
    Macinnes, JM
    [J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2000, 34 (22) : 4804 - 4809
  • [6] Nitrogen removal from wastewater by a catalytic oxidation method
    Huang, TL
    Macinnes, JM
    Cliffe, KR
    [J]. WATER RESEARCH, 2001, 35 (09) : 2113 - 2120
  • [7] Catalytic and noncatalytic wet oxidation
    Imamura, S
    [J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1999, 38 (05) : 1743 - 1753
  • [8] WET OXIDATION OF AMMONIA CATALYZED BY CERIUM-BASED COMPOSITE OXIDES
    IMAMURA, S
    DOI, A
    ISHIDA, S
    [J]. INDUSTRIAL & ENGINEERING CHEMISTRY PRODUCT RESEARCH AND DEVELOPMENT, 1985, 24 (01): : 75 - 80
  • [9] CATALYTIC-OXIDATION OF AQUEOUS-SOLUTIONS OF ORGANICS - AN EFFECTIVE METHOD FOR REMOVAL OF TOXIC POLLUTANTS FROM WASTE-WATERS
    LEVEC, J
    PINTAR, A
    [J]. CATALYSIS TODAY, 1995, 24 (1-2) : 51 - 58
  • [10] WET AIR OXIDATION
    MISHRA, VS
    MAHAJANI, VV
    JOSHI, JB
    [J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1995, 34 (01) : 2 - 48