2,4,6-Trichlorophenol-promoted catalytic wet oxidation of humic substances and stabilized landfill leachate

2014 ◽  
Vol 247 ◽  
pp. 216-222 ◽  
Author(s):  
Peng Wang ◽  
Guangming Zeng ◽  
Yanrong Peng ◽  
Fen Liu ◽  
Chang Zhang ◽  
...  
Keyword(s):  
Humic Substances ◽  
Landfill Leachate ◽  
Wet Oxidation ◽  
Catalytic Wet Oxidation

Mass Transfer Limited Wet Oxidation in Trickle-Bed Reactor

1998 ◽  
Vol 63 (11) ◽  
pp. 1938-1944 ◽  
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.

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

2002 ◽  
Vol 41 (5) ◽  
pp. 1166-1170 ◽  
Author(s):  
Sharon Eyer ◽  
Suresh Bhargava ◽  
James Tardio ◽  
Deepak B. Akolekar
Keyword(s):  
Wet Oxidation ◽  
Catalytic Wet Oxidation ◽  
Organic Removal

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

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.

The effect of reaction conditions on the apparent deactivation of Ce–Zr mixed oxides for the catalytic wet oxidation of phenol

2012 ◽  
Vol 180 (1) ◽  
pp. 25-33 ◽  
Author(s):  
J.J. Delgado ◽  
X. Chen ◽  
J.A. Pérez-Omil ◽  
J.M. Rodríguez-Izquierdo ◽  
M.A. Cauqui
Keyword(s):  
Mixed Oxides ◽  
Wet Oxidation ◽  
Catalytic Wet Oxidation ◽  
Reaction Conditions ◽  
Oxidation Of Phenol

scholarly journals Influence of humic substances on the landfill leachate biodegradability with a focus on temporal seasonality

2021 ◽  
Author(s):  
Wagner Guadagnin Moravia ◽  
Victor Rezende Moreira ◽  
Yuri Abner Rocha Lebron ◽  
Liséte Celina Lange ◽  
Míriam Cristina Santos Amaral
Keyword(s):  
Humic Substances ◽  
Landfill Leachate ◽  
Fulvic Acids ◽  
Biologic Treatment ◽  
Adequate Treatment ◽  
Tropical Regions ◽  
Treatment Techniques ◽  
Biological Treatments ◽  
Lowry Method ◽  
The Cost

Abstract The high resilience to biological treatments from the landfill leachate is generally associated with the presence of humic substances (HS). The brown color characteristic of this effluent is also related to these substances. Landfill leachate with low biodegradability can make biological treatments unfeasible, which can drive up the cost for the treatment of large leachate volumes. In this context, this research aimed to characterize the leachate in different seasonal periods, and verify the influence of HS species on the biodegradability of the effluent to assist in the selection of adequate treatment techniques. The HS quantification was performed using the modified Lowry method and speciation through fractionation according to the molar masses of the HS species. The tropical regions can be the precursor for the rapid stabilization of biodegradable organic matter. The warmer climate contributed to a reduced BOD/COD ratio (0.03) and the predominance of compounds of lower mass (e.g.: fluvic acids). The tests showed an HS concentration of 26.9% of the total COD in the raw leachate in the rainy season, which increased to 37.3% in the dry season. Approximately 70% of HS species refer to fulvic acids, a fraction identified as having the highest biologic treatment resilience.

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