Upcycling biogenic wastes into a high-quality product
The project converts agricultural residues, such as grain husks and sunflower pods, into biochar, binding the carbon permanently for hundreds of years. Biochar is then used in high-quality substrates and soil improvement products which have a wide range of positive co-benefits including increased soil fertility and water storage capacity. For maximum benefits, before applying biochar to the soil, it first needs to be “loaded” with nutrients by mixing it with organic fertilizer.
Thanks to its porous structure, biochar acts as a “sponge” catching nutrients in a plant-available form, which reduces the need for fertilizers and prevents leaching of nutrients to the groundwater. Sonnenerde’s tests show that addition of 10-20% biochar can clearly reduce nutrient losses during composting by up to 50%.
When applied to soils, biochar serves as habitat for soil microorganisms and promotes the formation of humus, which improves the soil structure and the water absorption capacity. The plants become more resistant to diseases, pests and yields remain stable even in years with unfavorable weather.
Pioneer of high quality
Sonnenerde is a true pioneer operating the first biochar production plant in Europe approved under the waste law and in continuous operation since 2012. For the pyrolysis process Sonnenerde has selected a high-technology production unit - Pyreg500 which prevents the formation of Polycyclic aromatic hydrocarbons (PAHs) which are usually formed during the biochar production process and are extremely carcinogenic. PAHs are eliminated while they are still in a gas form and burnt without residue, resulting in biochar free from dangerous substances.
The biochar production process is certified under the European Biochar Certificate which involves regular biochar quality control. Sonnenrde’s biochar may be used in organic farming according to the European positive list of permitted soil additives.
The waste heat from the biochar production process is used for raw material conditioning and heating. Excess energy is used for heating buildings. Electric power supply is provided by a photovoltaic system.
The extra income from selling carbon credits will enable Sonnenerde to scale their production three-fold.
Photo credit: Sonnenerde
Thanks to its porous structure, biochar acts as a “sponge” catching nutrients in a plant-available form, which reduces the need for fertilizers and prevents leaching of nutrients to the groundwater.