Mechanical-biological treatment

The requirement to reduce the amount of waste reaching landfill sites with no pre-treatment, or to eliminate dumping altogether, makes intensive treatment a necessity. Mechanical and biological treatment stages are a necessity irrespective of current legislation.

Our product spectrum includes shredding and separation technology as well as their interlinkage into complete processing lines. Biological treatment includes a closed intensive rotting process and a post-rotting stage for stabilisation.

Using screening and windsifting technology, remaining fractions high in calorific value are separated and landfill criteria are met.

Shredding with the robust single-shaft Terminator shredder produces perfect grain size for subsequent separation stages. By selecting the degree of shredding and adjusting the cutting gap, focus can be placed on input material and on the conceptual design of the plant.

Using separation technology the input is separated into an organic fraction (<80-100 mm) and into an oversized fraction containing recacables and high calorific parts. This treatment step runs as a single or multi-level process. Beside drum screens disc screens and ballistic separators with a selectivity depending on material properties are used.

The organic fraction ends up in a closed intensive rotting system. The use of a Mashmnaster mixing unit is a sensible option when adding sewage sludge/for homogenisation. The rotting process takes place in rotting tunnels – with optional automatic entry and discharge systems. With recorded data of parameters relevant to the degree of decomposition, along with ventilation and irrigation, a perfect rotting process is guaranteed.

Stabilisation of the organic fraction usually takes place in the form of a maturation process on windrows. Regular turning of triangular windrows for aeration is done with the Topturn X. Following the rotting process, the material is screened using star screens or drum screens. Oversized particles with high calorific values are incinerated, undersized particles are landfilled.