Coralia (Biochar carbon removal using continuous carbonisation technology）

Coralia, an Australian carbon-removal company founded in 2025, develops biochar carbon dioxide removal (CDR) projects that convert residual and invasive woody biomass into stable biochar. Its approach combines biomass management with continuous carbonisation technology to transform biogenic carbon into a more persistent solid form that can be stored in soils or other durable applications.

(This article contains one diagram and 676 words.)

Challenges: Biochar Carbon Removal

Biochar carbon removal offers a potentially scalable pathway for removing carbon dioxide from the atmosphere. Plants naturally absorb atmospheric CO₂ through photosynthesis and incorporate the carbon into biomass. However, when biomass decomposes or is burned, much of this carbon is eventually returned to the atmosphere.

Biochar production changes this carbon cycle by heating biomass under oxygen-limited conditions. During pyrolysis or carbonisation, part of the biomass is converted into a carbon-rich solid material with substantially greater resistance to biological decomposition.

If sustainably sourced biomass is used and the resulting biochar remains stable over long periods, the process can therefore transfer carbon from the short biological carbon cycle into a more persistent carbon reservoir.

The challenge is to accomplish this conversion efficiently and at industrial scale.

Conventional biomass carbonisation can suffer from several limitations, including inconsistent heating, incomplete conversion, high external energy requirements, variable biochar quality and difficulties in continuously processing heterogeneous biomass.

For carbon-removal projects, these engineering challenges are particularly important because the economics of CDR depend not only on the quantity of biomass processed but also on the fraction of carbon retained in stable biochar, process emissions, energy consumption and the durability of the resulting carbon storage.

Coralia Technology

Coralia’s biochar carbon-removal approach uses continuous carbonisation technology to convert lignocellulosic biomass, such as woody residues and invasive vegetation, into stable biochar. The diagram below depicts Coralia's biochar carbon-removal system.