Effect of calcination time on degradation of landfill leachate by Fe-Co-Ru-Ce / γ-Al2O3 catalytic wet oxidation system

The Catalytic Wet Oxidation (CWO) method was investigated to treat phenol cleaning wastewater from chemical container which is difficult dispose with traditional biological methods. In this paper, high-efficiency catalysts were prepared, two methods were used to prepare the catalyst: impregnating, sol-gel. Effects of metal salts concentration, calcination temperature and calcination time on each catalysts performance were explored and optimal catalyst preparation condition was optimized. The results show that the optimum sol-gel condition: Cu / Mn / Ce ratio of 2:2:2, the calcination temperature is 700 °C, calcination time is 5h.; the optimum impregnating condition: Cu / Mn / Ce ratio of 2:2:2, impregnated carrier (AC) of 0.9g/L mixture, the calcination temperature is 300 °C, calcination time is 4h; the sol-gel catalyst has longer service life, the samples prepared by impregnating technique were more active than the samples prepared by sol-gel technique at given reaction conditions.

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Mass Transfer Limited Wet Oxidation in Trickle-Bed Reactor

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19981938 ◽

1998 ◽

Vol 63 (11) ◽

pp. 1938-1944 ◽

Cited By ~ 1

Author(s):

Vratislav Tukač ◽

Jiří Vokál ◽

Jiří Hanika

Keyword(s):

Supported Catalyst ◽

Reaction Rates ◽

Gas Transfer ◽

Wet Oxidation ◽

Reactor Performance ◽

Catalytic Wet Oxidation ◽

Environmental Application ◽

Trickle Bed Reactor ◽

Fine Glass ◽

Trickle Bed

Catalytic activity of CuO-supported catalyst in phenol oxidation, and the influence of reaction conditions, viz. temperature (125-170 °C), oxygen partial pressure (1-7 MPa) and liquid feed (30-760 ml h-1), in the continuous operation using 17.9 mm i.d. trickle-bed reactor is presented. The hydrodynamic impact on the three-phase trickle-bed reactor performance in an environmental application of catalytic wet oxidation was also investigated. The results of trickle-bed operation were strongly influenced by wetting efficiency. An insufficient catalyst wetting can be to compensated by filling the catalyst bed voids by fine glass spheres. In the case of the gas transfer limited reaction, a better wetting of the catalyst can lead to worse reactor performance due to lower reaction rates.

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Selective Organic Removal from the Alumina Industrial Liquor: Wet Oxidation and Catalytic Wet Oxidation of Disodium Malonate

Industrial & Engineering Chemistry Research ◽

10.1021/ie010364f ◽

2002 ◽

Vol 41 (5) ◽

pp. 1166-1170 ◽

Cited By ~ 6

Author(s):

Sharon Eyer ◽

Suresh Bhargava ◽

James Tardio ◽

Deepak B. Akolekar

Keyword(s):

Wet Oxidation ◽

Catalytic Wet Oxidation ◽

Organic Removal

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Catalytic wet oxidation of high concentration pharmaceutical wastewater with Fe3+ as catalyst

Water Science & Technology ◽

10.2166/wst.2018.216 ◽

2018 ◽

Vol 2017 (3) ◽

pp. 661-666

Author(s):

Xu Zeng ◽

Jun Liu ◽

Jianfu Zhao

Keyword(s):

Oxygen Pressure ◽

Batch Reactor ◽

Oxygen Demand ◽

Kinetic Studies ◽

Cod Removal ◽

Wet Oxidation ◽

Catalytic Wet Oxidation ◽

Pharmaceutical Wastewater ◽

High Concentration ◽

Temperature Time

Abstract Catalytic wet oxidation of high concentration pharmaceutical wastewater with Fe3+ as catalyst was carried out in a batch reactor. Results showed that the degradation of pharmaceutical wastewater was enhanced significantly by Fe3+. The effects of reaction parameters, such as the catalyst dose, reaction temperature, time, and initial oxygen pressure, were discussed. The chemical oxygen demand (COD) removal increased with the increases of catalyst dose, temperature, time and oxygen supply. With the initial COD 34,000–35,000 mg/L, approximately 70% COD removal can be achieved under the conditions of catalyst 1.0 g and oxygen pressure 1.0 MPa at 250 °C after 60 min. The results of kinetic studies showed that two reaction steps existed in this oxidation process, which followed an apparent first-order rate law. This process provides an effective approach for the pretreatment of high concentration pharmaceutical wastewater.

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