FAQ — Find Answers to All Your Questions


What is biochar and how does it help fight climate change?

Biochar is a stable, carbon-rich material produced by pyrolysis (heating organic waste in the absence of oxygen). The biochar itself can be used, among others, to improve soil health and agricultural productivity, make cement and asphalt lighter and more durable, or filter environmental pollutants from water. At the same time it locks away carbon for centuries, making it an efficient tool for combatting climate change.

What technology does Viochar use to produce biochar?

We have two ways of making biochar: batch reactors and continuous feed rotary kiln reactors. The batch reactor is designed for flexibility, affordability, and ease of use, while the rotary kiln is more complex and is used for industrial scale biochar production.

What types of biomass can be used in the Viochar batch reactor?

Most biomass with low moisture and a particle size of 10mm–60mm is suitable, including:

  • Wood (excess wooden biomass)

  • Agricultural waste (dried plant residues)

  • Garden waste (mixed biomass from gardens)

How can I start a biochar project or partner with Viochar?

You can contact us using our contact form, or you can find us on LinkedIn.


How much biomass can the batch reactor process?

The batch reactor can handle 1.4 m³ of biomass per cycle, equating to 448 m³ per year if run at full capacity.

How much biomass can the continuous feed rotary kiln reactor process?

The rotary kiln reactor can process around 6000 tons of biomass per year, creating roughly 2400 tons of biochar, depending on the feedstock used.

How long does it take to create a batch of biochar using the batch reactor?

All in all, it takes approximately 12 hours for a full cycle. This includes: loading, starting, pyrolysis, cooling and emptying.

Is the batch reactor portable?

Yes, the batch reactor is designed to be portable. Using a forklift or similar equipment, it can be easily moved.

What are the main applications for biochar?

The main applications for biochar include, but are not limited to:

  • Soil amendment (improves fertility, water retention, and microbial activity)

  • Carbon sequestration (locks carbon in a stable form)

  • Livestock & compost additive (improves nutrient absorption, reduces odors)

  • Water filtration (natural filter medium)