Pre-treatment Equipment

Our pre-sorting process guarantees high level of segregation and recycling of waste fractions to save virgin raw materials. Waste pre-sorting removes unwanted particles, separates the waste for different purposes and crushes it to suitable particle size.

The process starts with weighing the incoming garbage trucks. After weighing waste is deposited in the tipping storage acting as a buffer. This enables deliveries 24/7 regardless of the operating hours of the pre-sorting plant ensuring continuous waste flow during the pre-sorting operation.

Next bags will be opened, and large objects will be crushed, when the waste is fed into a shredder. Crushed waste then runs on a conveyor belt, where a magnet removes the ferrous metals, onto a screen that will separate small particles, like ashes, biowaste, sand and soil that are difficult to separate by hand. Biowaste can be used in biogas generation or be composted. The rest of the waste will be recycled or landfilled.

The main waste stream from the screen is passes through a manual sorting station after being evenly distributed on a conveyor belt. All inert and harmful material is removed and recycled as raw material, before the combustible waste fuel will go into a buffer storage. At this stage there is no more materials like metals or electronic waste, just plastics, textiles, wood and some residual waste matter. 

Due to the buffer storage, the plant will have a continuous fuel supply. The buffer is dimensioned to cover those periods, when the pre-sorting plant is not operating. The waste fuel is then fed to the plant and exactly the right amount of fuel is conveyed to the combustion grate depending on the fuel calorific value and moisture.
 

Biogas project’s pre-treatment and feeding solutions are always based on the characteristics of the feedstock and the required capacity. Technology solutions are always selected for each project on a case-by-case basis. For example, pre-treatment of agricultural biomasses is determined by the specifications of the feedstock material used.

For the optimal operation of the biogas plant’s microbiological process, the raw material used in the biogas plant must meet certain criteria:

• Plant-based feedstocks (grass or spoiled root vegetables); feedstock crushing to reduce the size of the piece
• Challenging feedstocks (for example straw); fermentation process can be enhanced with enzymes or other chemicals, if necessary
• Manure; often does not require pre-treatment at all, but for example slurry separation before the process can be reasonable. 

To homogenize the feedstock mass and initiate fermentation process, the feedstock material is often mixed with recycled liquid at the end of the pre-treatment process.