Influence of Ru precursors on the activity of Ru/Al2O3–TiO2 catalysts for catalytic wet air oxidation of high concentration organic compounds

RSC Advances ◽  
2016 ◽  
Vol 6 (77) ◽  
pp. 73810-73816 ◽  
Author(s):  
Fagui Lu ◽  
Chaoying Yu ◽  
Xu Meng ◽  
Jinqi Zhang ◽  
Gexin Chen ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
High Concentration ◽  
Ru Catalysts

The nature of the Ru precursors affected the performance of Ru catalysts with those prepared from chloride-free Ru precursors being more active than those prepared from chlorine-containing Ru precursors.

Al2O3 supported Ru catalysts prepared by thermolysis of Ru3(CO)12 for catalytic wet air oxidation

2011 ◽  
Vol 257 (17) ◽  
pp. 7727-7731 ◽  
Author(s):  
Chaoying Yu ◽  
Peiqing Zhao ◽  
Gexin Chen ◽  
Bin Hu
Keyword(s):  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Ru Catalysts

Catalyst Activity on Landfill Leachate Treatment with CWAO Method

2013 ◽  
Vol 467 ◽  
pp. 127-132
Author(s):  
Qing Yu Wan ◽  
Yong Li Zhang ◽  
Jin Bing Lin
Keyword(s):  
Reaction Time ◽  
Landfill Leachate ◽  
Organic Pollutant ◽  
Catalyst Activity ◽  
Treated Wastewater ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
High Concentration ◽  
Leachate Treatment

The landfill leachate belongs to typical high concentration and organic pollutant wastewater. In this study, Landfill leachate was treated with Catalytic Wet Air Oxidation (CWAO) method. The monitoring indicators consist of CODCr, absorbance, pH and chroma. The results show that the activity of the catalysts arrange from high to low: Co (NO3)2, Cu (NO3)2, Fe (NO3)3, CuSO4, Fe2(SO4)3, Mn (NO3)2, FeSO4, Zn (NO3)2, Bi (NO3)3, Zr (NO3)2, Ni (NO3)2; For the same kind of metal, the catalytic activity of nitrates is higher than that of sulfates; Relative to the distribution of catalyst, the activity of Co (NO3)2 is the strongest. With the optimized catalyst Co (NO3)2 , the landfill leachate has been treated. With the extension of reaction time, the effluent CODCr, absorbance and chroma reduced, but the wastewater biodegradability indicator B/C improved. At the reaction time of 90 min, the CODCr of landfill leachate reduced to 7176 mg/L, and the absorbance and the chroma reduced to 9.1 and 1600 times, respectively. The above results show that the activity of catalyst Co (NO3)2 is high, and the biochemical indicators B/C of wastewater is higher than the critical value of 0.3. Therefore, the treated wastewater shows the good biodegradability, and the chosen catalyst of Co (NO3)2 presents the high activity.

Influence Factors of Landfill Leachate Treatment with CWAO Method

2013 ◽  
Vol 849 ◽  
pp. 127-131
Author(s):  
Qing Yu Wang ◽  
Wei Li Chen ◽  
Jin Bing Lin
Keyword(s):  
Reaction Time ◽  
Landfill Leachate ◽  
Removal Rate ◽  
Operating Conditions ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
High Concentration ◽  
Leachate Treatment ◽  
Decolorization Rate

Landfill Leachate is a kind of organic wastewater with high concentration and non-biochemical character, and Catalytic Wet Air Oxidation (CWAO) is suitable for this kind of wastewater treatment. In this study, Landfill leachate was treated with Catalytic Wet Air Oxidation (CWAO) method. The monitoring indicators consist of CODCr, absorbance, pH and chroma. The results show that: CODCr removal rate and decolorization rate of landfill leachate reduce with the reduction of the influent pH, the increment of water concentration and the extension of the reaction time; Under the optimized operating conditions: the influent pH of 8.10, the influent CODCr of 16611 mg/L, the reaction time of 90 min, the CODCr removal rate and decolorization rate of landfill leachate reach 56.8% and 83.7%, respectively. The effluent pH is 8.33 and chroma is 1600 times.

scholarly journals Catalytic Wet Air Oxidation Using Supported Pt and Ru Catalysts for Treatment of Distillery Wastewater (Cognac and Sugarcane Vinasses)

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3974
Author(s):  
Thu ◽  
Besson
Keyword(s):  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Batch Mode ◽  
Ru Catalysts ◽  
Toc Removal ◽  
Distillery Wastewater ◽  
High Pollution ◽  
Dark Color ◽  
Continuous Oxidation

The production of brandy from wine and bioethanol from sugarcane in distilleries generates vinasses, which are effluents that are rich in organic matter. Since they have a high pollution load characterized by high chemical and biological oxygen demands and a dark color, the depollution of these effluents is inevitable. Pt and Ru catalysts supported on titania and zirconia were explored in the catalytic wet air oxidation (CWAO) processing of cognac and sugarcane wastewaters, in batch mode and in a trickle-bed reactor, at a temperature condition of 190 °C and a pressure condition of 70 bar air. The addition of a catalyst promoted total organic carbon (TOC) abatement and the oxidation of ammonium ions formed from organic nitrogen in the effluents to dinitrogen or nitrates. The best results in terms of selectivity to N2 were obtained by using Pt catalysts; a selectivity of 92% to N2 and a TOC removal of 90% were observed in continuous oxidation of the sugarcane vinasse.

Catalytic wet air oxidation of high concentration pharmaceutical wastewater

2013 ◽  
Vol 67 (10) ◽  
pp. 2281-2286 ◽  
Author(s):  
Wei Zhan ◽  
Xiaocong Wang ◽  
Daosheng Li ◽  
Yongzheng Ren ◽  
Dongqi Liu ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Oxygen Demand ◽  
Precipitation Method ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Co Precipitation

In this study, we investigated the pretreatment of a high concentration pharmaceutical wastewater by catalytic wet air oxidation (CWAO) process. Different experiments were conducted to investigate the effects of the catalyst type, operating temperature, initial system pH, and oxygen partial pressure on the oxidation of the wastewater. Results show that the catalysts prepared by the co-precipitation method have better catalytic activity compared to others. Chemical oxygen demand (COD) conversion increased with the increase in temperature from 160 to 220 °C and decreased with the increase in pH. Moreover, the effect of the oxygen partial pressure on the COD conversion was significant only during the first 20 min of the reaction. Furthermore, the biodegradability of the wastewater improved greatly after CWAO, the ratio of BOD5/COD increased less than 0.1–0.75 when treated at 220 °C (BOD: biochemical oxygen demand).

Catalytic wet air oxidation of high-concentration organic pollutants by upflow packed-bed reactor using a Ru–Ce catalyst derived from a Ru3(CO)12 precursor

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22633-22638 ◽  
Author(s):  
Chaoying Yu ◽  
Xu Meng ◽  
Gexin Chen ◽  
Peiqing Zhao
Keyword(s):  
High Activity ◽  
Organic Pollutants ◽  
Strong Interaction ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
High Concentration

The low loading Ru–Ce catalyst have high activity in CWAO due to a strong interaction with the support.

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