References

References

ODSI is proud of its commitment to quality, high level of engineering, independent R&D department and full project management, including in the context of high risk industrial environments such as the petrochemical industry.

Many clients trust ODSI and the DYNASKIM® solution:

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client references

ENGINEERING OFFICES REFERENCES

A FEW PROJECT REFERENCES

PROJECT 1: Historical pollution and groundwater drawdown.

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DIESEL POLLUTION, 20 DRAWDOWN WELLS WITH 10 WELLS USED IN PAR-ALLEL FOR SKIMMING, DEPTH 2.5 M, PUMPING UNIT DS 500-12, SKIMMERS SKIM 2-25.

THE PROJECT IN VIDEO

Origin of the incident
  • Historical pollution. Leak in a set of diesel storage tanks protected by a concrete holding tank containing all storage tanks.
Pollutant
  • Diesel.
Pollution description
  • On a surface equivalent to a football field, a free phase of diesel, a few centimeters to tens of centimeters thick, located under and outside the holding tank, on the side of the aquifer discharge.
Geography and nature of the terrain
  • Along a sea access canal, with small level variations in the canal..
  • Sand.
Variability of the groundwater
  • Average depth of aquifer 2.3 m below ground level.
  • Seasonal variability of aquifer between 50 and 70 cm per year depending on the considered wells.
Solution implemented
  • 20 wells, diam. 600 mm, depth 4.5 m, used for drawdown and filled with a gravel pack consist-ing of 4/8 mm gravel, equipped with a 110 mm slotted liner. 10 wells are used in parallel of the drawdown for hydrocarbon skimming.
  • A continuous trench with a 600 mm width, a depth of 4.5 m, and a length of 90 m located between the storage area protected by the integrated holding tank and the neighbouring plots. This trench is intended to create a barrier to recover the product by lowering the water table. Average drawdown of +/-25 cm.
  • As a first step, installation of a pumping unit DS 500-12 and 12 skimmers SKIM 2-25, with a storage capacity of 0.8m3 of product. In a second step, modification of the pumping unit DS 500-12 by addition of a 2.5m3 product storage container to minimize the costs associated with the discharge of the pumped product.
Results Over a period of a little less than 2 years:

  • 10 m3 of pure product recovered
  • An average of 16.6 L/day of pure product pumped per day
  • It should be noted that the quantity of pumped product is doubled while draw-down is active.

PROJECT 2: Accidental contamination with river pollution and emergency response.

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DIESEL POLLUTION, 6 WELLS, DEPTH 4.0 M, PUMPING UNIT DS 500-12 AND SKIMMERS SKIM 4-25 & SKIMMER 600

THE PROJECT IN VIDEO

Origin of the incident
  • Crack in the filling conduit of storage tanks.
Pollutant
  • Diesel.
Pollution description
  • On a surface of a few acres, a diesel free phase of a few centimeters, with a migration of the free phase towards the nearby canal.
Geography and nature of the terrain
  • Along a canal.
  • Fill, sand, silt, clay and rocks.
Variability of the groundwater
  • Average depth of aquifer 4.0 m below ground level./li>
  • Variability of aquifer +/-1 m.
Solution implemented
  • Emergency response shortly after discovering the incident.
  • Delivery and implementation of a pumping unit DS 500-12 accompanied by a 1m3 outdoor storage IBC.
  • Placement of a floating dam on the canal with free phase suction using a SKIMMER600.
  • Digging of 6 open pits with a 4.5 m depth, of which 4 were subsequently lined. Wells were equipped with 2 SKIM 4-25 moved from well to well according to the needs. The pits were equipped with SKIMMER 600.
  • Recovery of HC in the excavations, no draw-down in the first phase. Subsequently, drawdown was set up to block migration towards the canal.
Results
  • Over a period of 8 months, recovery of 6M3 of pure product.
  • 90% of the total volume were recovered during the first 4 months.

PROJECT 3: Historical viscous chemical pollution

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CHEMICAL POLLUTION, 8 WELLS, DEPTH 22.0 M, PUMPING UNIT DS 500-12D, SKIMMERS SKIM 2-25 & SKIM 4-25

THE PROJECT IN VIDEO

Origin of the incident
  • Historical pollution: leakage in tanks of a chemical plant.
Polluant
  • Chemicals such as: hydrocarbons, BTEX, phenols, chlorobenzenes and VOCs (Volatile Organic Compounds).
  • The product has a high viscosity (honey or semi liquid tar type) and crystallizes in cold weather.
Pollution description
  • On a surface of a few acres, a floating layer of chemicals and hydrocarbons with a free phase thickness of up to 7 m originally.
Geography and nature of the terrain
  • Agricultural zone.
  • Limestone (chalk).
Variability of the groundwater
  • Average depth of aquifer 22 m below ground level.
  • Seasonal variability of aquifer between 2.5 and 3.0 m over the year.
Solution implemented
  • ODSI’s solution was implemented after encountering many difficulties using other methods of skimming.
  • ODSI installed a pumping unit DS 500-12D (specially equipped for skimming at a depth greater than 8.5 m – practical limit for vacuum pumping) linked to skimmers SKIM 2-25 and SKIM 4-25. A settling and storage unit was later added in order to reduce handling and treatment costs for the pumped product.
Results
  • The dynamic vacuum suction technique allowed for the skimming of the viscous free phase to the point of discharge, and reduced the free phase to a thickness of less than 10 cm in all wells.
  • Over a period of more or less three years, recovery of 11 m3 of pure product, with an average pure product pumping of 9.5 L/day.

PROJECT 4: Historical pollution in explosion proof (ATEX) zone.

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HYDROCARBON POLLUTION, 8 WELLS, DEPTH 12.0 M, PUMPING UNIT DS 500-6D ATEX & SKIMMERS SKIM 4-250

THE PROJECT IN VIDEO

Origin of the incident
  • Historical pollution in a petrochemical unit.
Pollutant
  • Mainly hydrocarbons, BTEX, aromatic and aliphatic compounds.
Pollution description
  • Presence of a free phase ranging from a few centimetres to several tens of centimetres on a fairly extensive surface.
Geography and nature of the terrain
  • Industrial zone near a river with strong level variations.
Variability of the groundwater
  • Average depth of aquifer 12 m below ground level.
  • 2.5 m groundwater variability, fast and induced by the level variations of the nearby river.
Solution implemented
  • Given the scope of pollution, installation of two pumping units DS 500-6D ATEX, equipped for pumping at a depth greater than 8.5 m, each connected to a 5000 L ST 5000 storage unit.
  • Utilisation de Use of 8 skimmers SKIM 4-250 specially developed to follow groundwater variation over 2.5 m.
  • The operation of the installation is controlled by the groundwater level. The thickness of the free phase is strongly linked to the position of the aquifer table.
Results
  • Over a period of more or less four years, recovery of more than 93m3 L of pure product.

PROJECT 5: Accidental petrol pollution, 36 wells in explosion proof (ATEX) zone

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PETROL POLLUTION, 36 WELLS, DEPTH 3.0 M, PUMPING UNIT DS 500-36 ATEX AND SKIMMERS SKIM 2-25

Origin of the incident
  • Accident in an oil depot involving a petrol volume bigger than 400 m3.
Pollutant
  • Petrol
Pollution description
  • 4,000 m2 plume of pollution with a maximum free phase of 700 mm at a depth between 2 and 3 m.
Geography and nature of the terrain
  • Industrial site located on the seafront.
  • Sandy terrain.
Solution implemented
  • ODSI’s solution was implemented after encountering difficulties with other methods of skimming producing excessive amounts of contaminated water.
  • A DS 100-10 ATEX cabin was installed as an emergency response on 10 wells equipped with SKIM 2-25.
  • In a second step, a DS 500-36 ATEX unit was specially developed and installed to pump simultaneously over 36 wells.
Results
  • More than 350 m3 recovered.

PROJECT 6: Pollution in residential areas and service stations

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HYDROCARBON POLLUTION, VARIABLE DEPTH, ONE PUMPING UNIT DS 500-6/12 (ATEX) OR DS 100-5 (ATEX), SKIMMERS SKIM 2-25 OR SKIM 4-25

 

Origin of the incident
  • Historical or accidental pollution, mainly heating oil tank leakage or leakage of service station petrol/diesel.
Pollutant
  • Heating oil.
  • Fuel: diesel, petrol
Pollution description
  • Spills ranging from a few m3 to several tens of m3 near or under the storage tanks.
Solution implemented
  • Installation of small pumping units DS 500-6/125 or DS 100 – 5 linked to skimmers SKIM 2-25 or SKIM 4-25.