Taking Care of Waste Wood

14. August 2018 // All topics, News,

Whether Euro-pallets, furniture, bulky goods, roof beams, railway sleepers, construction and demolition waste, rootstocks that are difficult to shred or many other types of waste wood: the processing of waste wood for co-incineration or recycling purposes is gaining importance due to new ordinances.

What changes do the amended German and Austrian waste wood ordinance include

In Germany, the recycling of waste wood is expected to increase by at least ten percent. The target is a recycling quota of 30 percent. This is envisaged in the amended German Waste Wood Ordinance, which came into force in April 2017. However, from an average of around eight million metric tons of waste wood per year, six million (80 percent) are still incinerated – in biomass power plants, waste incineration and co-combustion plants for energy production. Only about two million metric tons or 20 percent of the quantities produced are used for the production of engineered wood and pulp. Also the generation of syngas for chemical use is considered a recovery operation (source: bvse-Bundesverband Sekundärrohstoffe und Entsorgung e. V., Bonn, Germany).

According to the five-stage waste hierarchy in German and European legislation for a circular economy, incineration and disposal in landfills are at the end of the waste management chain for consumer waste and residual materials from industrial production – if all other options are exhausted. In view of the increasing scarcity of resources and raw material reserves, waste prevention, reuse and recycling have priority over incineration. And the demand in this area is growing worldwide: innovative technologies and custom-made know-how solutions tailored to the wishes and requirements of users are in demand in the up-and-coming recycling market.

Furthermore a Waste Wood Ordinance (RecyclingholzV Novelle 2018 – BGBl. II Nr. 178/2018) was published recently in Austria in July 2018. The aim of this ordinance is to increase the recycling rate of waste wood essentially in terms of the waste hierarchy. This should be accomplished by a compulsory separated source separation on the one hand and by the implementation of a commandment of recycling on the other hand (source: Stefan Herzer, voeb – Verband Österreichischer Entsorgungsbetriebe, Vienna, Austria).


Cost-efficient with high throughput

The Urraco and Miura shredders from Lindner are ideally suited to high throughput rates when shredding waste wood. The mobile universal shredders with their compact, robust design and up to 770 PS with tracked chassis, hook lift or trailer shred effortlessly up to 140 tons of waste wood per hour to a defined output size. And this is all done with low fuel consumption, which applies to all Lindner shredders in line with the exhaust emission standards. The powerful hydraulic system is also equipped with the manufacturer’s special twin-tower planetary gears for optimum engine performance.

The twin-shaft mobile shredders are resistant to foreign objects, which can often be found in the waste wood feed in recycling plants: nails, screws, metal plates, glass, hard plastics, etc. With the machines, the focus is clearly on long-term, low-maintenance operation and rapid removal of foreign objects in order to achieve a high degree of productivity.
In addition to the extremely fast removal of foreign objects via the innovative hydraulic maintenance door, thanks to this system the complete shaft can be easily replaced within an hour with the aid of a wheel loader. ‘So the client always has the right cutting tool at hand’, Stefan Scheiflinger-Ehrenwerth knows from experience. The innovative twin-shaft shredder also features a completely new, electronically controlled hydraulic drive boasting a particularly fast response time and allowing precise machine control to match the material flow.


It’s all about the end product – energy for 25,000 households

The Altenstadt combined heat and power plant in Upper Bavaria, Germany, is the perfect example for the impact of waste wood recovery. The company Lindner designed and supplied an on-site solution that combined a Urraco 95 shredder as the heart of the plant with a special downstream star screen.

The Altenstadt combined heat and power plant went into operation in 1999 and today supplies more than 25,000 households with energy. Since then, more than one billion kilowatt hours of electricity have been fed into the public grid. The CO2 savings during this period – measured in terms of the electricity produced – amount to more than 620,000 metric tonnes.

Waste wood from grade A I to A III (in accordance with the German waste wood ordinance), sawdust and also fresh wood is turned into highly calorific fuel. The materials normally used are non-directly recyclable timber from thinning, rootstocks, wind-felled timber, weak wood and branches and twigs. As Bernhard Schuster, authorised officer of Heizkraftwerk Altenstadt GmbH & Co. KG, explains, previously this wood would have been mostly incinerated, chopped or left to rot.

After the Lindner Urraco 95 shreds the wood to a specific particle size, metals, plastics, glass and other foreign objects, which may be contained in the input material, are separated and discharged. The downstream star screen filters the material very thoroughly, effectively cleaning the fractions while emitting low noise, minimizing agglomerates and limiting the length of fine particles.

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