Modeling of a Porous Reactor for Supercritical Water Oxidation by a Residence Time Distribution Study

2003 ◽  
Vol 42 (10) ◽  
pp. 2122-2130 ◽  
Author(s):  
E. Fauvel ◽  
C. Joussot-Dubien ◽  
E. Pomier ◽  
P. Guichardon ◽  
G. Charbit ◽  
...  
Keyword(s):  
Residence Time ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Supercritical Water Oxidation ◽  
Distribution Study

Modeling of Non-catalytic Supercritical Water Oxidation of Phenol

2015 ◽  
Vol 10 (4) ◽  
pp. 243-251 ◽  
Author(s):  
S.M. Ghoreishi ◽  
S.M. Shariatmadar Mortazavi ◽  
Ali Hedayati
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Concentration ◽  
Residence Time ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Phenol Concentration ◽  
Supercritical Water Oxidation ◽  
Effective Parameters ◽  
Numerical Predictions ◽  
Phenol Conversion

Abstract The non-catalytic supercritical water oxidation (SCWO) of phenol was modeled using Gopalan-Savage and Thornton-Savage global and network rates. Comparison of experimental data for the phenol conversion with the numerical predictions of this study indicated very close compatibility. Applying the validated model, the phenol conversion and selectivity of various products were studied as a function of effective parameters such as feed phenol concentration, reactor residence time, feed temperature, and feed oxygen concentration. The results of modeling analysis show that an appropriate elevated temperature range (460°C < T <500°C) and long residence time (≈90 s) reduce the concentration of hazardous products (i.e., dimers, dibenzofuran, dibenzo-p-dioxin) and maximize the selectivity of environmental benign products such as water and carbon dioxide. Also, high oxygen concentration (≈0.01 mol/L) increase water and carbon dioxide yield. Moreover, high feed phenol concentrations cause a shortcoming for the SCWO system in terms of phenol conversion and selectivity of desirable environmental products. As a consequence, the feed phenol concentration of ≤2 × 10−3 mol/L is recommended as the appropriate condition.

Radiotracer method for residence time distribution study in multiphase flow system

2009 ◽  
Vol 67 (7-8) ◽  
pp. 1445-1448 ◽  
Author(s):  
S. Sugiharto ◽  
Z. Su’ud ◽  
R. Kurniadi ◽  
W. Wibisono ◽  
Z. Abidin
Keyword(s):  
Multiphase Flow ◽  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Flow System ◽  
Radiotracer Method ◽  
Distribution Study

The Treatment of Concentrated Landfill Leachate from Membrane-Based Processes by Supercritical Water Oxidation

2014 ◽  
Vol 522-524 ◽  
pp. 560-564 ◽  
Author(s):  
Yan Meng Gong ◽  
Shu Zhong Wang ◽  
Yan Hui Li
Keyword(s):  
Residence Time ◽  
Supercritical Water ◽  
Landfill Leachate ◽  
Water Oxidation ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Supercritical Water Oxidation ◽  
N Removal ◽  
Varied Temperature

Supercritical water oxidation (SCWO) of concentrated landfill leachate has been carried out in a batch reactor in fluidized bed sand bath, operated under varied temperature (450-600 °C), pressure (23-29 MPa), residence time (5-20 min) and oxidation coefficient (1.5-3.0). The experimental results indicated that temperature and oxidation coefficient had significant influences on the oxidation reaction, whereas the pressure and residence time were not crucial factors. The chemical oxygen demand (COD) and ammonia nitrogen (NH4-N) removal efficiencies could reach up to 99.23% and 98.64% at 600 °C, 25 MPa and 5 min with a oxidation coefficient of 2, respectively, and the effluents could be discharged harmlessly.

Removal of Organic Matters in Pesticide Wastewater by Supercritical Water Oxidation

2014 ◽  
Vol 955-959 ◽  
pp. 2340-2348 ◽  
Author(s):  
Dong Hai Xu ◽  
Shu Zhong Wang ◽  
Chuan Bao Huang ◽  
Xing Ying Tang ◽  
Yang Guo ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Residence Time ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Oxygen Demand ◽  
Reaction Pathways ◽  
Experimental Plant ◽  
Supercritical Water Oxidation ◽  
High Concentration ◽  
Organic Matters

Supercritical water oxidation (SCWO) is an alternative to effectively dispose many varieties of organic wastewaters. In this article, a high concentration pesticide wastewater with very complicated components was handled by SCWO in a batch experimental plant at 25 MPa, 410–580 °C within the oxidant coefficient of 1.1–4.0 and the residence time of 1.0–10.0 min. The results show that reaction temperature, oxidant coefficient, residence time can improve XCOD(removal efficiency of chemical oxygen demand) of reactor effluent. XCODreaches up to 99.89% at 550 °C, 25 MPa with the oxidant coefficient of 3.0 and the residence time of 5.0 min, and the corresponding COD concentration is 73 mg/L. Residence time indicates a relatively more important influence on COD1at higher reaction temperatures and OCs. Furthermore, possible reaction pathways for SCWO of organic matters in the pesticide wastewater were also proposed primarily.

Parameter Optimization of Municipal Sludge Treated by Supercritical Water Oxidation Process

2014 ◽  
Vol 1010-1012 ◽  
pp. 693-698
Author(s):  
Mei Gao ◽  
Shu Zhong Wang ◽  
Hong Ma
Keyword(s):  
Total Nitrogen ◽  
Residence Time ◽  
Reaction Temperature ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Oxidation Process ◽  
Removal Rate ◽  
Supercritical Water Oxidation ◽  
Municipal Sludge ◽  
Optimum Reaction

Supercritical water oxidation process can effectively degrade the total nitrogen in municipal sludge. In order to obtain the optimum parameters of municipal sludge treated by supercritical water oxidation, this article selected the total nitrogen removal rate as the evaluation value, and used response surface methodology to optimize the parameters of sludge treatment by supercritical water oxidation, the parameters including temperature, pressure, residence time and oxidation coefficient. The results show that the reaction temperature, pressure and residence time exist interaction, and the influence degree of parameters is: pressure > reaction temperature > reaction retention time; The optimum reaction conditions are as follows: reaction temperature 539 °C, pressure 27 MPa, residence time 434 s, and oxidation coefficient 2.16, under these conditions, the total nitrogen decreasing efficiency can reach 74.12%.

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