Abstract
This study targets the research gap in co-hydrothermal gasification (HTG) process conditions and composition of sewage sludge and microalgae biomass on hydrogen enriched gas production. This study also focuses on zero emission concept for waste disposal and value addition of these wastes for green energy production. The effect of solid catalyst synthesized from carbon-zinc battery waste on higher amount of hydrogen gas production was studied. Response surface methodology (RSM) was used for modelling and optimizing the hydrogen yield from HTG process. Uppermost hydrogen composition was 38.27 wt% in gaseous product (40.7 wt%) at catalyst dose of 4 wt% for 2: 1 ratio at a temperature of 440 °C. HTG mechanism involves water-gas shift, steam reforming and methanation reactions for hydrogen production. Optimisation studies showed catalyst load of 2.3 wt%, temperature of 426.36 °C and time of 70.22 min will result in 40 wt% of hydrogen gas yield.
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