By Ralph Green (Sustainability Coordinator), Satarla Ltd

The concept of circularity in biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More production hinges on maximising the value of byproducts from industries such as forestry, agriculture, and waste management. Instead of relying on virgin materials, using byproducts—such as conifer brash, agricultural residues, and organic waste—ensures that these materials are put to their highest use, reducing waste and the need for additional resource extraction. By creating a system where waste products are continuously cycled back into the production chain, we reduce reliance on landfill disposal or burning, both of which contribute to greenhouse gas emissions. Importantly, biochar produced from waste materials helps close the loop within the forestry, agriculture, and gardening sectors, enhancing their sustainability.

The Role of Biochar in Land Restoration

Biochar has gained recognition for its potential to restore and improve soil quality, which is critical for land restoration efforts. When applied to degraded or contaminated soils, biochar offers numerous benefits. Its porous structure improves soil aeration, enhancing root development and supporting beneficial microorganisms. Biochar also increases water retention, which is vital for soils in areas prone to drought or erosion. Additionally, it can improve nutrient retention, making soils more fertile and better able to support vegetation growth. Beyond its physical properties, biochar can alter the soil’s chemical composition, such as increasing pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More in acidic soils, and reducing the bioavailability of harmful pollutants, including heavy metals. These characteristics make biochar a useful tool not only for land restoration but also for boosting the resilience of ecosystems in the face of climate change. Biochar’s ability to act as a carbon sink also provides an additional environmental benefit, as it sequesters carbon in the soil for extended periods.

Biochar Production from Forestry Waste: The Example of Conifer Brash

One of the most promising sources of biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More for biochar production comes from forestry waste, particularly conifer brash. Conifer brash, which includes branches, needles, and other residues left behind after forestry operations, is often seen as a nuisance or an underutilised byproduct. Left to decompose on forest floors, conifer brash can contribute to slow decomposition rates, air pollution when burned, or even pose risks to biodiversity. However, when this material is diverted into biochar production, it offers multiple environmental and economic benefits. The pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More of conifer brash—heating it in a low-oxygen environment—transforms it into a stable, carbon-rich material that can be used to improve soil quality. Not only does this process prevent the carbon from being released into the atmosphere through decomposition or burning, but it also produces a valuable byproduct that can support land restoration efforts, as well as other applications in agriculture and gardening. The high pH of biochar made from conifer wood makes it particularly effective for neutralising acidic soils, while its low polycyclic aromatic hydrocarbon (PAH) levels make it a safer choice for environmental applications compared to some other feedstocks.

The benefits of using conifer brash have been best evidenced in restoring abandoned mine land soils, neutralising acidic soils, improving soil density, and increasing water holding capacityWater holding capacity is the amount of water that soil can retain. Biochar can significantly increase the water holding capacity of soil, improving its ability to withstand drought conditions and support plant growth.   More. This can make the existing system more circular, which is visualised in this diagram, extracted from a previous article I wrote that went into the topic in more detail:

Biochar Production from Crop Byproducts: Examples from Agriculture 

Biochar’s versatility extends beyond forestry waste. Agricultural byproducts, such as crop residues, manure, and other organic waste, also serve as valuable feedstocks for biochar production. These materials are often abundant and costly to dispose of, making them ideal candidates for biochar conversion. In agriculture, biochar can improve soil health, enhance nutrient cycling, and increase water retention, making it an important tool for sustainable farming practices. Further research and examples from agriculture will highlight the potential of these feedstocks to contribute to the circular biochar economy.

Biochar offers a sustainable solution for agriculture by converting organic byproducts, such as crop residues, wood chips, and straws from grain crops, into a valuable soil amendmentA soil amendment is any material added to the soil to enhance its physical or chemical properties, improving its suitability for plant growth. Biochar is considered a soil amendment as it can improve soil structure, water retention, nutrient availability, and microbial activity.   More. Rather than letting these materials decompose and release carbon dioxide (although it is noted that they are often used in other ways on farms already – e.g. for livestock feed or for dressing soils), they are recycled into biochar, to enhance soil health and fertility. High-porosity biochar made from agricultural byproducts improves water retention, nutrient cycling, and soil structure, supporting regenerative farming practices. This approach not only boosts soil productivity but also aligns with the growing demand for sustainable farming solutions, making biochar a practical and low-impact tool for farmers looking to enhance both their crop yields and environmental sustainability.

The Need for Practical Implementation of Biochar Projects

While much of the recent focus on biochar has been on research and exploring its potential applications, the real challenge lies in moving from theory to practice. Despite numerous trials and experiments being conducted that support the environmental benefits of biochar, there is still a gap in widespread adoption and implementation. Current efforts have largely been constrained to research projects or small-scale pilots, with few large-scale, practical implementations that demonstrate the full potential of biochar as a tool for land restoration, carbon sequestration, and waste management. 

Moving forward, there is a critical need for more focus on the practical aspects of biochar projects, including the establishment of infrastructure for collecting biomass feedstocks, scaling up production processes, and creating clear policies that incentivise biochar use in land restoration and agricultural systems. This shift from research to action will enable the widespread integration of biochar into circular systems across industries, making a tangible impact on soil health, carbon reduction, and waste minimisation.

By focusing on practical implementation, we can accelerate the transition to a more sustainable, circular economy, where biochar becomes a mainstream tool for restoring soils, improving agricultural practices, and contributing to wider environmental commitments. 

Ralph Green is a Sustainability Coordinator at Satarla, passionate about translating high-level sustainability strategies into practical, on-the-ground action through impactful and integrated research projects. From overseeing satellite-driven solutions to in-the-field habitat management, He’s committed to delivering hands-on approaches to ensure that policies are not just theoretical but impactful. He has been coordinating Satarla’s FarmBalance project, focusing on making agricultural supply chains in Scotland more sustainable and equitable, through innovation in natural capital evaluation.