How to valorise garden waste

Biogreen technology is made to challenge the casual take and dispose of economy model where the waste is left aside for further generations. What others see as an unwanted residue, we consider a source of value. The pyrolysis process of garden waste is made to create useful products from discarded residues and create the circularity in the local communities.

Thanks to its concept, Biogreen compact pyrolysis solution enables to turn the garden waste into useful bio-commodities and energy. The core of the pyrolysis process is the Spirajoule, an electronically controlled, hollow shaft screw conveyor transporting the feedstock through the process and heating up the product. The output quality biochar and calorific syngas that can produce steam and heat to district heating. The Biogreen solution is a compact unit that enables managing the garden waste right at the place of its generation while minimizing the carbon footprint related to transportation.

Typical standardized Biogreen garden waste solution can valorize approx. 7 000 tons of garden waste annually, producing 1500 tons of biochar, an agronomic improvement product, which can be returned into the municipality and create an example of a circular economy in the region.

Such a solution enables not only to recycle the waste and create a great example of circularity in the region but also creates an important value to the business of waste managers and waste collectors who are dealing with the garden residues. Thanks to that, our customers focus on fulfilling their sustainability strategy but also generating a profit for their business.

Today there are numerous technologies to reduce our carbon footprint or even make us carbon neutral. The Biogreen process takes it one step further – it is carbon negative. When biomass is deteriorating or burned, a significant quantity of carbon dioxide is released into the atmosphere and contributes to the negative climate impacts. This could be avoided when producing biochar instead. Biochar becomes one of the best solutions for carbon sequestration. Biochar is mainly used in agriculture to enhance soil fertility, improve plant growth, and provide crop nutrition.

A parallel product of the Biogreen process for garden waste is syngas, an energy-rich gas that can be used to produce steam for the grid or surrounding. Generated synthetic gas leaving the Biogreen reactor is a hot mixture of condensable and non-condensable phases. Syngas from pyrolysis is a combustible gas and can be used for the production of power in many types of equipment, from steam cycles through gas engines and turbines. Syngas can also be used as a carbon-neutral substitute for natural gas.

We realize that establishing an attractive business model often requires diversification of income streams from the plant. This is why our Biogreen system is not only fully customized but also provides a possibility of using the additional energy stream from production (syngas) in order to convert it into power. Thanks to this opportunity, the biochar production plant can be simultaneously used to generate hot water or steam for the local production process, or produce heat to economize the garden waste drying.