PYROLYSIS

What is pyrolysis?

The production of biochar involves three different steps:

Pre-treatment

The purpose of the pre-treatment is to process the organic material so that the pyrolysis is as effective as possible. In most cases, this involves dewatering and drying the material in cases where the material has a high water content (sludge, algae and seaweed). Another type of pre-treatment is cleaning and sifting to remove stones and gravel that could otherwise destroy the feed screws and other parts of the pyrolysis boiler.

Pyrolysis
After-treatment

Benefits of pyrolysis

WHAT WE DO IN THE PROJECT REST TILL BÄST

Previous studies have shown that the biochar’s surface area, cation exchange capacity and pH-value increase with rising temperatures. Within Rest till Bäst, we will investigate whether this is also the case with pyrolysis of the organic residues used in the context of this project, i.e. algae and seaweed, seed crop residues, sludge and park and garden waste. We will also measure the content of cadmium and other heavy metals before and after pyrolysis in order to determine the temperature required to obtain a good separation of them, and to evaluate how the plant nutrient content in the biochar is affected by the pyrolysis temperature. In addition, operating stability and energy balances at the various temperatures will be evaluated.

The pyrolysis plant used within Rest till Bäst is part of a project funded by the Swedish Environmental Protection Agency’s Klimatklivet.

COMMITTED PROJECT PARTNERS

CONTACT

Markus Paulsson
markus.paulsson@lund.se
+46 (0) 46-359 53 36
City of Lund, City Office
221 00 Lund, Sweden

REST TILL BÄST

Rest till Bäst is a Vinnova-funded project whose purpose is to develop solutions for managing society’s organic residues and create a much needed beneficial product, while at the same time minimising environmental and climate impact.