Treatment plants

Mechanical-biological MSW treatment

The main motivation of residual waste treatment with biological processes is based on the “EU-landfill directive”. The target is a reduction of the residual waste volumes to be land filled – especially a reduction of biodegradable contingents. To transfer the resultant defaults efficiently in the plant construction means to treat the residual on different stages mechanically. With the right mechanics as a combination of grinding, conveying, separating and mixing technology the fine fraction (mainly organic material) is separated for the following biological treatment.

The biology can be done aerobic (composting) anaerobic (fermentation) or as a combination of both.

Aerobic waste trreatment is normally a two shaft process. The first treatment step is the intensive rotting, mostly carried out as tunnel composting, with different technical implementations. The main advantage is the individual process control of each tunnel. The process of tunnel composting is basically characterized by the forced aeration with air circulation to provide an optimal rotting process with an adequate water content of the rotting material and an intensive supply with oxygen at a constant heap temperature. Only the self-contained construction gives the possibility of specific technical aeration and central exhaust air collection with subsequent treatment.

The second stage of the aerobic treatment is mostly implemented as secondary rotting. After the aerobic treatment follows the fine treatment with loading systems for the separated contingents.

The anaerobic biological processes for the treatment of residual waste can be performed as a wet or dry process. Generally the aerobic treatment as a one- or two-step process follows the fermentation technology.

Ennex now puts the focus on a concept for biological treatment that is based on the principle of wet fermentation with following wet oxidation. The objectives and tasks are always defined specifically for each project. But the central point of these process conception is the production of biogas.


RDF production

Each time when Ennex sorting plants produce recyclable fractions or Ennex treatment plants for residual waste separate the fine fraction for the biological treatment, rest fractions emerge. Attractive are the high caloric fractions, because of the possibility to make refuse derived fuel (RDF) out of them.

When the right treatment technology is chosen multi fraction separators separate unwanted materials from the leftovers. Ferrous metals and aluminium are separated as recyclables. Materials with PVC can be recognized and isolated by optical systems.

Only from the wanted high caloric materials single shaft grinding machines produce RDF, which can be marketed in the adequate particle size.


Bottom ash treatment

Even after the waste incineration not all recyclables in the burnt residuals are lost. Especially here it is possible to make the best of the rest with Ennex. Processing on a high level of automation is realised by a combination of conveying and separation technology.

This way it is possible to achieve a constantly good quality of the different output fractions.

Main target is a high separation efficiency for recyclables and additives for building material. While the metal contingents can be sold as scrap metal, the remaining slag contingents in different grains can be used as landfill building material.