TURN OLD INTO NEW.

Recovering waste wood properly plays an important part in environmental protection. The degree of contamination of the material determines its further use. The grading structure may vary from country to country. In Germany, for example, there are four grades. Waste wood of grades A I and A II can be sent for recycling, e.g. in chipboard production. Grades A III and A IV are usually only suitable for incineration.

Waste wood recycling for material recovery

Most of the waste wood processed in the recycling process goes to the chipboard industry. As it is subsequently used to make everyday products, it is important to only process materials that are free from substances that are harmful to the environment or health, such as organohalogen compounds. These are adhesions consisting of halogens such as fluorine or chlorine in combination with hydrocarbons. Although these substances are now largely banned, they can still be found in some waste wood batches in the form of PVC coatings or wood preservatives, for example.

Waste Wood Recycling Characteristics

Particle size	10 - 30 mm
Waste wood grades	A1, A2
Use	mostly in the chipboard industrie

Processing waste wood into fuel

Some types of waste wood are difficult or impossible to recycle due to their treatment. Wood preservatives for products that are exposed to heavy weathering and stress and, above all, halogenated organic compounds play an important role here. In order not to leave these residual woods unused, under the right conditions they can be the ideal raw material for generating heat and energy.

Waste Wood Fuel Characteristics

Standard	EN ISO 17225-1
Particle size	80 - 120 mm (categorised in P classes)
Waste wood grades	A1 - A4
Use	as fuel in thermal power plants

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VIRGIN OR SLIGHTLY CONTAMINATED

GRADING WASTE WOOD

GRADING – AN OVERVIEW

A I	Virgin or only mechanically processed waste wood, minor contamination, e.g. solid wood panels, virgin wood on building sites, untreated solid wood furniture, etc. – particularly suitable for recycling
A II	Glued, coated, painted, without organohalogen compounds or wood preservatives, e.g. pallets, clippings from composite wood, structural chipboard, etc.
A III	Treated, coated, with organohalogen compounds, without wood preservatives, e.g. bulky waste wood (mixed materials, coated furniture, etc.)
A IV	Treated, coated, with organohalogen compounds, without wood preservatives, e.g. bulky waste wood (mixed materials, coated furniture, etc.)

STRICT STANDARDS – SOLID BIOFUEL CLASSIFICATION

Selecting the shredding technology for subsequent incineration or recycling of waste wood always depends on the required end product. The more defined the final particle size, the easier it is to feed into subsequent processes. The ISO 17225-1 standard describes the different specifications in great detail in terms of the required particle sizes.