Valorizing saline biomass from horticultural waste via pyrolysis

BIORESOURCE TECHNOLOGY REPORTS(2023)

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Abstract
Large emissions of greenhouse gases (GHGs) are severely affecting the planet. Thus, considerable effort has been undertaken to deploy technologies for CO2 capture and long-term storage. Biochar is a carbon-rich material that can have a two-fold contribution toward mitigating climate change: (a) it enhances soil fertility, thus reducing the requirement for fertilizers and (b) it can persist in soil for thousands of years, serving as a carbon sink material. Herein, we evaluate the operating conditions required to produce biochar using saline biomass obtained from horticultural waste in a university campus on the coast of the Red Sea in Saudi Arabia. The biomass has >10 wt% of Ca, Na, and Mg, which allows for the production of microporous biochar with a surface area of similar to 150 m(2)/g without any additional chemical or physical activation treatment. The bio-oil obtained as an associated product has similar to 25 %-50 % of terpenoids and 9 %-42 % of phenols, and its composition varies based on the pyrolysis conditions. These high-value compounds can enhance the economic feasibility of a process that can contribute to environmental remediation.
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Key words
Pyrolysis,Biochar,Terpenoids,Saline biomass,Carbon dioxide storage
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