Our offer

6V Srl with our partner, Trevi Spa & 3V Green Eagle Spa, can offer the customer a multidisciplinary approach that includes the simultaneous application of different reclamation technologies according to the characteristics of the contaminated site.

6V Srl can offer the following technologies, some of which are patented:

SOIL & SEDIMENT CONTAMINATION TREATMENT

  • Soil & Sediment Washing
  • Pyrolysis
  • Thermal Desorption
  • Hazard Waste Removal ®
  • On-site treatments (SGIBITI®)
  • Stabilization of sediments or sludge

WASTEWATER, SLUDGE & OIL TREATMENT

  • TOP® - Wet Oxidation for Wastewater
  • TOP® - Wet Air Oxidation for Spent Caustic
  • TOP® - Wet Oxidation for Sludge
  • DUAL TOP® - Wet Oxidation for Sludge & Wastewater combined
  • Reactive permeable barriers
  • Treatment of oil-based muds from drilling operations
  • Recovery of solvent/lube oil via thermal treatment

CONTAMINATION SITE CONFINEMENT

  • Trevi Directional Drilling Technology (TDDT®)
  • Plastic slurry walls
  • Sheet Piles
  • Secant Piles
  • Jet Grouting
  • Deep Mixing
  • Pneumatic Flow Mixing

6V Srl also has a partnership with DECOMAR Spa, which uses a patented environmental dredging technology known as LIMPIDHO® to export contaminated sediments from the bottom of the sea, lakes or rivers without re-suspending particles, the worst enemy for marine ecosystems.

Together with Decomar Spa, 6V can offer the market a continuous closed cycle system for dredging and treating sediments: the Soil & Sediment Washing mobile system. Owing to specific design choices with great treatment capacity, it is able receive the sediments directly from dredging without passing them through the storage bays. In this way, time and money are saved.

Soil & Sediment Washing: S & SW Plant

Soil & Sediment Washing (S&SW) is an off-site treatment technology that is used to remediate contaminated soils and sediments coming from environmental reclamation, with the objective of maximizing the recovery of material and thus reducing the quantity of waste sent to landfill sites.

S&SW generally consists of granulometric selection and washing materials constituting the solid phase for the total or partial transfer of the contamination in the fine fraction.

The soil fractions with greater granulometry (sands and gravel) are normally sent for recovery whereas smaller particles (mud and clay) in which most of the contaminants are normally concentrated, are sent for treatment or disposal after dehydration.

6V Srl has a mobile Soil and Sediment Washing plant that can treat up to 100 tonnes/hour of contaminated soil, sediment or drilling spoil in order to recover sands and inerts from productive processes or for environmental restoration. The plant is authorized by Italian regulations as a mobile waste treatment plant.

6V Srl’s Soil & Sediment Washing plant is divided into different treatment sections that cover the entire waste treatment process. In general, the following sections can be identified:

Section A - Feeding incoming waste

The main purpose of this section is to receive the waste and feed it correctly to the plant, eliminating anything that could compromise correct operation.

The section has to:

  • Receive the waste;
  • Eliminate elements of excessive dimensions;
  • Transfer the waste to the next washing process;
  • Quantify and totalize the fed waste;
  • Eliminate metal and/or magnetic waste

Section B – Washing and granulometric separation

In this section, transfer takes place of the contaminants from the solid part of the waste to the washing fluid (water or seawater) and separation takes place of the contaminated fractions from the recoverable fractions.

The task of the section is to:

  • Fluidify and wash the waste;
  • Separate and wash the recovered gravel;
  • Eliminate the floating solids;
  • Separate and refine the sands.

Section C - Chemical and physical treatment of the process wastewater

The pulp containing the finer suspended fractions coming from the previous sections is conveyed to the treatment section, where the suspended solids are coagulated and flocculated and then sedimented.

The section thus has to:

  • Coagulate and flocculate the suspended solids;
  • Separate solids from liquids.

Section D - Densification of fine fractions

The sludge concentrated in the chemical and physical treatment contains most of the contamination and is further dehydrated by mechanisms for separating the solids from the liquid. The main object of treating sludge is to minimize final disposal costs. The plant, depending on site-specific needs, can be provided with two different mechanical dehydration systems that may, in particular cases, be used alongside one another.

Section D1 – Filter press

Consists of a series of sheets or plates alternating with cloths that adhere to one another to create chambers in which the dehydrated sludge panel is formed. The sludge is pumped at high pressure into the filter. The solid phase is retained in the cavities between plates and frames and from the filter press the liquid phase exits, from which nearly all the suspended solids have been removed. The solid phase is then recovered when the filter press opens, when the quantity of sludge produced has filled the cavity. Filter-pressing is thus a discontinuous process.

Section D2 - Centrifuge

Machine consisting of a drum that is partially frustoconical that contains a feed screw. Both the outer drum and the feed screw rotate with slight differences in rotation speed. The solids are separated by centrifugation from the liquids, which accelerates natural sedimentation.

Section E – Treatment of excess water

The liquid phase that emerges from the duct located in the upper part of the sedimentation vessel is collected in a storage tank. Most of this water is used in a closed cycle to fluidify and wash soil.

Depending on the type of waste treated and the water content of the waste, the process may have a water deficit or excess. In the former case, water is topped up constantly with water from the industrial grid whereas in the latter case the wastewater completely treated before the waste water is discharged.

Filtration is initially on sand beds (corundum/quartzite) to remove solids and suspended contaminants and then on active carbon bed to remove any dissolved contaminants.

Pilot Plants

A soil washing laboratory pilot plant with 50 kg/hour capacity

A soil washing pilot plant with 5 tonnes/hour capacity

A line - PFM technology consolidation pilot plant with 5 tonnes/hour capacity