Supercritical water gasification of sewage sludge using bench-scale batch reactor: advantages and drawbacks

2013 ◽  
Vol 16 (1) ◽  
pp. 82-92 ◽  
Author(s):  
Osamu Sawai ◽  
Teppei Nunoura ◽  
Kazuo Yamamoto
Keyword(s):  
Sewage Sludge ◽  
Supercritical Water ◽  
Batch Reactor ◽  
Bench Scale ◽  
Supercritical Water Gasification

scholarly journals Catalytic Properties and Recycling of NiFe2O4 Catalyst for Hydrogen Production by Supercritical Water Gasification of Eucalyptus Wood Chips

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4553 ◽  
Author(s):  
Ane Caroline Pereira Borges ◽  
Jude Azubuike Onwudili ◽  
Heloysa Andrade ◽  
Carine Alves ◽  
Andrew Ingram ◽  
...  
Keyword(s):  
Supercritical Water ◽  
Biomass Conversion ◽  
Batch Reactor ◽  
Operating Conditions ◽  
Wood Chips ◽  
Nickel Iron ◽  
Eucalyptus Wood ◽  
Supercritical Water Gasification ◽  
Temperature Programmed ◽  
Reaction Cycles

Nickel iron oxide (NiFe2O4) catalyst was prepared by the combustion reaction method and characterized by XRD, N2 adsorption/desorption, thermogravimetric analysis (TG), and temperature programmed reduction (TPR). The catalyst presented a mixture of oxides, including the NiFe2O4 spinel and specific surface area of 32.4 m2 g−1. The effect of NiFe2O4 catalyst on the supercritical water gasification (SCWG) of eucalyptus wood chips was studied in a batch reactor at 450 and 500 °C without catalyst and with 1.0 g and 2.0 g of catalyst and 2.0 g of biomass for 60 min. In addition, the recyclability of the catalyst under the operating conditions was also tested using recovered and recalcined catalysts over three reaction cycles. The highest amount of H2 was 25 mol% obtained at 450 °C, using 2 g of NiFe2O4 catalyst. The H2 mol% was enhanced by 45% when compared to the non-catalytic test, showing the catalytic activity of NiFe2O4 catalyst in the WGS and the steam reforming reactions. After the third reaction cycle, the results of XRD demonstrated formation of coke which caused the deactivation of the NiFe2O4 and consequently, a 13.6% reduction in H2 mol% and a 5.6% reduction in biomass conversion.

Supercritical water gasification of sewage sludge: Gas production and phosphorus recovery

2014 ◽  
Vol 174 ◽  
pp. 167-175 ◽  
Author(s):  
Nancy Y. Acelas ◽  
Diana P. López ◽  
D.W.F. (Wim) Brilman ◽  
Sascha R.A. Kersten ◽  
A. Maarten J. Kootstra
Keyword(s):  
Sewage Sludge ◽  
Supercritical Water ◽  
Gas Production ◽  
Phosphorus Recovery ◽  
Supercritical Water Gasification
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