Pyrolysis of rice husk using CO2 for enhanced energy production and soil amendment

Hakyoung Kim, Saeyeon Kim, Jeongmin Lee, Minyoung Kim, Dohee Kwon and Sungyup Jung

Energy & Environment, 2023, vol. 34, issue 4, 873-885

Abstract: Anthropogenic CO 2 generations from use of fossil resources has led to catastrophic climate problems. Biochar is a promising material for CO 2 capture and storage in soil, because it does not require additional storage space. To produce biochar, pyrolysis is required in an oxygen-limited condition. In an attempt to offer more environmentally benign route for biochar formation, this study introduced CO 2 as a reaction agent. Using rice husk as a model compound, biochars were produced under CO 2 and N 2 condition. Porosity of rice husk biochars (RHBs) were enhanced under CO 2 condition, because CO 2 affected to formation of nano-sized pores. pH and moisture retention capacity of garden soil was controlled with an addition of RHBs. Mixtures of garden soil and RHB were also used as cultivation media for growth of barley grass, and plant growth in the mixtures was improved by 20% comparing to garden soil. Moreover, CO 2 contributed to enhanced syngas generation during biochar production through gas phase reactions between CO 2 and volatile compounds. Thus, this study proved that CO 2 is a useful reactant for pyrolysis of biomass waste.

Keywords: biochar; carbon dioxide; pyrolysis; soil amendment; syngas (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:sae:engenv:v:34:y:2023:i:4:p:873-885

DOI: 10.1177/0958305X221079422

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