The effects of feedstock pre-treatment and pyrolysis temperature on the production of biochar from the green seaweed Ulva

Journal of Environmental Management
David A Roberts, Rocky de Nys

Abstract

Green seaweeds from the genus Ulva are a promising feedstock for the production of biochar for carbon (C) sequestration and soil amelioration. Ulva can be cultivated in waste water from land-based aquaculture and Ulva blooms ("green tides") strand millions of tons of biomass on coastal areas of Europe and China each year. The conversion of Ulva into biochar could recycle C and nutrients from eutrophic water into agricultural production. We produce biochar from Ulva ohnoi, cultivated in waste water from an aquaculture facility, and characterize its suitability for C sequestration and soil amelioration through bio-chemical analyses and plant growth experiments. Two biomass pre-treatments (fresh water rinsing to reduce salt, and pelletisation to increase density) were crossed with four pyrolysis temperatures (300-750 °C). Biomass rinsing decreased the ash and increased the C content of the resulting biochar. However, biochar produced from un-rinsed biomass had a higher proportion of fixed C and a higher yield. C sequestration decreased with increasing pyrolysis temperatures due to the combination of lower yield and lower total C content of biochar produced at high temperatures. Biochar produced from un-rinsed biomass at 300 °C had...Continue Reading

References

Jun 15, 2007·The Science of the Total Environment·Michel MerceronPhilippe Morand
Aug 28, 2010·Bioresource Technology·Michael I BirdRocky de Nys
Sep 28, 2010·Journal of Environmental Management·Mustafa K HossainPeter F Nelson
Apr 10, 2012·Bioresource Technology·Akio EndersJohannes Lehmann
Apr 10, 2015·Scientific Reports·David A RobertsRocky de Nys

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Citations

Dec 16, 2018·International Journal of Environmental Research and Public Health·Nithiya ArumugamNoor Shawal Nasri
Oct 2, 2020·Global Change Biology. Bioenergy·Jessica M M AdamsJoseph Gallagher
Jan 4, 2021·Journal of Environmental Management·S KeerthananMeththika Vithanage

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