The term “waste wood” refers to every wooden product that has been used at least for once as commercial product and remains now as waste for disposal or recycling / reuse :

Waste wood thermal recycling
Conclusions

The co-combustion of waste wood and lignite is technically feasible in industrial facilities with moving grate of fluidised bed furnace, meeting in parallel the legislative limits for the pollutant emissions.
Waste wood is a promising option for industrial and district heating boilers. This is particularly true for wood processing industries
The development of solid waste management companies, which will collect and transform the waste wood into an easy to handle bio-fuel, will contribute significantly to the increase of the share of waste wood combustion in the energy balance of Greece.