The roughing and grinding operations vary depending on the type of waste on which the treatment is to be applied. It is also subject to the infrastructural conditions of the location and the overcrowding capacity that is available.
It is therefore essential, in order to offer a precise description of the required pretreatment phases, an inspection of the conditions in situ and the characteristics of the waste to be treated.
• Manual screening: a conveyor line will be established with sufficient length to be able to place a group of workers on its bands to remove any improper (plastic, metal, stone) present in the waste stream.
• First magnetic screening for ferrous materials. Magnetic screening or overbands will be implemented on the conveyor belt.
• Screening of non-ferrous metals. Through an Eddy Current system, also implemented on the conveyor belt, non-ferrous metal materials will be separated from the flow.
• Shredded. Once the previous processes have been carried out, the waste flow will be directed to a shredder. The type of crushing is very dependent on the type of majority waste to be treated, therefore a technical analysis of the waste flow would be pending.
• Second magnetic screening. Once the residue has been crushed, it will pass through another overband to eliminate the ferrous materials that could remain in the flow.
• Lastly, the waste stream will be transported to a trommel where a final mechanical separation will be carried out.