Wet air oxidation (WAO) for the treatment of industrial wastewater and domestic sludge.: Design of bubble column reactors

被引:32
作者
Debellefontaine, H
Crispel, S
Reilhac, P
Périé, F
Foussard, JN
机构
[1] Inst Natl Sci Appl, Dept Genie Procedes Ind, Lab Ingn Procedes Environm, F-31077 Toulouse 4, France
[2] ELF Aquitaine Co, Grp Rech Lacq, Environm Serv, Dept Chim Performance & Environm, F-64170 Artix, France
关键词
wet air oxidation; wastewater treatment; reactor design; backmixing; mass transfer; gas hold-up; kinetics;
D O I
10.1016/S0009-2509(99)00217-1
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
This work aims at modelling bubble column reactors for wet air oxidation (WAO) acid operated under steady flow conditions. Aqueous wastes containing organic pollutants can be treated by WAO, i.e. oxidation by bubbling oxygen through a liquid aqueous phase, under high temperature (200-325 degrees C) and pressure (up to 150 bar). Only an handful of industrial plants are in operation and they were designed by extrapolating results from pilot plants. This paper discusses what needs to be known for a scientific design. The bubble column is divided into a number of cells. Each one is perfectly mixed and connected with the previous (backflow) and next cell. Data are available for the hydrodynamics (axial dispersion, gas hold-up), mass transfer and kinetics of reactions. The thermodynamics of the gas phase are determined by Peng and Robinson's equation of state and Henry's law describes the equilibrium conditions. These data have been used to implement a computer program intended to determine the performance of a WAO reactor. Typical profiles within the reactor are presented, as are dependencies on operating parameters. An ignition phenomenon, leading to an unstable operating regime, is also evidenced. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:4953 / 4959
页数:7
相关论文
共 21 条
[1]   BUBBLE SIZE, INTERFACIAL AREA, AND LIQUID-PHASE MASS-TRANSFER COEFFICIENT IN BUBBLE COLUMNS [J].
AKITA, K ;
YOSHIDA, F .
INDUSTRIAL & ENGINEERING CHEMISTRY PROCESS DESIGN AND DEVELOPMENT, 1974, 13 (01) :84-91
[2]  
[Anonymous], PROPERTIES GASES LIQ
[3]  
BAIRD MHI, 1975, J CHEM ENG, V9, P17
[4]   Treatment of organic aqueous wastes: Wet air oxidation and wet peroxide oxidation(R) [J].
Debellefontaine, H ;
Chakchouk, M ;
Foussard, JN ;
Tissot, D ;
Striolo, P .
ENVIRONMENTAL POLLUTION, 1996, 92 (02) :155-164
[5]   IMPROVED TOOLS FOR BUBBLE COLUMN REACTOR DESIGN AND SCALE-UP [J].
DECKWER, WD ;
SCHUMPE, A .
CHEMICAL ENGINEERING SCIENCE, 1993, 48 (05) :889-911
[6]  
Himmelblau D.M., 1960, J. Chem. Eng. Data, V5, P10, DOI 10.1021/je60005a003
[7]  
JOSHI JB, 1980, T I CHEM ENG-LOND, V58, P155
[8]  
KODRA D, 1993, THESIS U HOUSTON
[9]   A MODEL FOR GAS HOLDUP IN BUBBLE-COLUMNS INCORPORATING THE INFLUENCE OF GAS-DENSITY ON FLOW REGIME TRANSITIONS [J].
KRISHNA, R ;
WILKINSON, PM ;
VANDIERENDONCK, LL .
CHEMICAL ENGINEERING SCIENCE, 1991, 46 (10) :2491-2496
[10]   Bubble flow characteristics in bubble columns at elevated pressure and temperature [J].
Lin, TJ ;
Tsuchiya, K ;
Fan, LS .
AICHE JOURNAL, 1998, 44 (03) :545-560