Dry sifting is an entirely physical process whose purpose is to sort granular material according to size, separating out oversize particles, which are generally less contaminated, from the fines, which are more granulometrically homogeneous and usually more highly contaminated.

Any inert material separated out can be treated as a product and reused within a variety of production cycles or as backfill, provided it meets the criteria for release as established by Italian Ministerial Decree 186/2006; otherwise it is coded with an appropriate EWC and treated as waste.

Riccoboni has many mobile screening systems authorised for treating waste, designed and built in different ways to be used for specific operations. Using the systems we have available, we can sift using rotary screens (trommels) or inclined vibrating tables, separating out up to three sizes of granules, generally between 5 and 200 mm, simultaneously.

Each granulometric fraction is handled base on its physico-chemical characteristics and its degree of contamination.

By separating the soil into three distinct granulometric fractions, the sifting process allows each fraction to be subjected to a different treatment phase or sent directly for disposal/recovery following its chemical characterisation, in accordance with the law in force. This ability to subject each fraction to a specific treatment phase calibrated to suit its own particular physico-chemical characteristics and degree of contamination and chosen for its compatibility makes it possible to optimise the treatment process.

Screening Systems
Screening Systems
If necessary, each screening system can be paired with an emissions control system, consisting of a free-standing cyclone separator with spray dryer and an adsorption filter for the final treatment of the air before it is discharged into the atmosphere. With this system, it is possible to achieve an over 95% abatement of both chemical substances and odour units.

Treatment Flow Chart

Screening Systems Treatment Flow Chart