| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 679372 | Bioresource Technology | 2016 | 4 Pages |
•H2 production by heating the mixture of sewage sludge with Ca and Ni hydroxides.•The yield varies on the added ratios of two hydroxides.•Ca carbonate and Ni metal in the reaction products confirm the synergistic effects.•Both hydrous and dried samples may be used as raw materials.
A new process to produce hydrogen efficiently from sewage sludge (SWS) was developed with co-grinding operation of the dried SWS with calcium and nickel hydroxides (Ca(OH)2 and Ni(OH)2) and subsequent heating of the ground mixture at relatively low temperature below 600 °C. A set of analytical methods were used to characterize the ground samples before heating and the gaseous and solid products after heating. Thermo-mass spectroscopic (TG-MS) analysis showed hydrogen occurrence around 450 °C. Hydrogen yield over 70 g per kg SWS with concentration of 93.6% was obtained with the hydroxide additions of Ca to C from SWS at 1:1 and Ni to C at 1:6, respectively. X-ray diffraction (XRD) analysis of the solid residues after heating confirmed the existences of calcium carbonate and nickel metal. Based on the obtained results, possible reaction pathway was proposed.
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