Achievements – Engineering

Our achievements - Engineering

ENSURING THE SAFETY OF A PLANT IN OPERATION

SPARGING / VENTING – B112

CONTEXT & DATA

  • Industrial site in operation, indoor and outdoor intervention
  • Pollution with halogenated volatile organic compounds (HVOCs)
  •  Impact on soil and groundwater
  •  Alluvium and limestone down to 25 m, two superimposed water tables

KEY FIGURES

3 weeks

of test

7 control wells

 

5 test wells

ASSESSMENT

  • Use of a mobile venting/sparging skid
  • Separate sparging pilot between alluvium and limestone
  • Sequenced and combined sparging pilot
  • Detection of sparging radius of influence with helium injection
  • Pilot report with treatment dimensioning and estimation of clean-up costs

Ensuring the safety of a plant in operation

CHEMICAL AND BIOLOGICAL TREATMENT TESTS IN THE LABORATORY; PUMPING PILOT; VENTING PILOT B111 / B112

CONTEXT & DATA

  • Pollution by trichlorethylene
  • Difficult context: pollution to a depth of over 20 m in limestone in the Saint-Ouen area
  • Health risks in a building receiving the public

KEY FIGURES

3 Tests

in the laboratory

8 tons

of activated carbon used

5 REAGENTS

tested

3 MONTHS

of venting pilot

ASSESSMENT

  • Performance of tests in the laboratory:
    • chemical oxidation and reduction test (persulfate, peroxide, permanganate, iron zero and dithionite)
    • anaerobic biological degradation test
  • On-site testing:
    • pumping tests
    • venting pilot
  • Water and gas treatment to meet discharge limits
  • Complete design report

DIMENSIONING OF THE POLLUTION REMEDIATION OF AN OLD OIL DEPOT

SPARGING / VENTING PILOT - B112 – B1123

CONTEXT & DATA

  • Historic pollution related to a former oil depot
  • Light hydrocarbon, BTEX impact in the unsaturated zone and in the saturated zone
  • Sand and silt fill up to 4 m deep and limestone up to 15 m deep

KEY FIGURES

6 WEEKS

of tests

3 TESTS

of Venting per stage
Sparging-Venting per stage
Long-term Sparging-Venting

6 pilot wells

located at different depths

ASSESSMENT

  • Compliance with client HSE audit
  • Definition of radius of influence, treatment operating parameters and mass flow monitoring
  • Design of future treatment and estimation of time and costs

ENSURING THE SAFETY OF A PLANT IN OPERATION

BIOLOGICAL TREATMENT TEST IN THE LABORATORY; PUMPING TEST – B111 / B112

CONTEXT & DATA

  • Site in operation, Management Plan process underway
  • Water pollution by trichloromethane (chloroform)
  • Pilot tests carried out with the aim of establishing a Work Design Plan (PC)

KEY FIGURES

1 WEEK

of on-site tests (groundwater pumping tests in stages with different flow rate during 72 h)

> 99%

lowering of trichloromethane concentrations in groundwater

4 conditions

tested in laboratory: anaerobic conditions, C1 and C2 molasses and lactate C2 reduction

ASSESSMENT

  • Performance of a HAZOP in the preparatory phase
  •  Use of an extractor with a capacity of 1500 m3/h and 500 mbar of depressurization
  • Use of a CATOX for gas treatment
  • Use of ATEX components
  • Continuous oversight and monitoring with remote management
  • Precise dimensioning of the treatment with cost and time estimations

ENSURING THE SAFETY OF A PLANT IN OPERATION IN SPAIN

CHEMICAL AND BIOLOGICAL TREATMENT TEST IN THE LABORATORY; TEST PUMPING; SPARGING / VENTING PILOT – B111 / B112

CONTEXT & DATA

  • Site in operation
  • Soil and groundwater pollution by VOCs
  • Administration awaiting a remediation plan

KEY FIGURES

5

different pilots

2 WEEKS

of on-site tests

6 wells

built

SPECIFICITY

  • International site with significant constraints requiring a high level of reactivity
  • High safety standards required
  • Remediation plan submitted in Spanish
  • Design of treatment and estimation of time and costs

POLLUTION REMEDIATION OF AN OLD REFINERY

SHORT TERM PILOT (BIO)VENTING, (BIO)SPARGING, PUMPING, VACUUM EXTRACTION TESTS – B112

CONTEXT & DATA

  • Pollution by volatile hydrocarbons
  • Lithology composed of fine sands with the presence of a fine layer of silts at a depth of around 3 m
  • Groundwater present from a depth of 2 m
  • Management plan to be developed
  • Very important issue

KEY FIGURES

6 MONTHS

of pilot tests

17

different tests

4

pollution remediation Techniques tested

46 wells

 

ASSESSMENT

  • Performance of tests on 46 wells to obtain precise radius of influence measurements:
    • test pumping
    • venting pilot
    • sparging/venting pilot with helium tracing
    • vacuum extraction pilot
  • Performance of in situ respiration tests
  • Detailed report with selection of the method with the best cost/benefit balance and pre-dimensioning

POLLUTION REMEDIATION OF AN OLD REFINERY

LONG-TERM PILOT (BIO)VENTING, (BIO)SPARGING, PUMPING, VACUUM EXTRACTION TESTS – B112

CONTEXT & DATA

  • Pollution by volatile hydrocarbons
  • Lithology composed of fine sands with the presence of a fine layer of silts at a depth of around 3 m
  • Groundwater present from a depth of 2 m
  • Management plan to be developed
  • Very important issue

KEY FIGURES

18 MONTHS

of tests

3

action radii tested

57 wells

 

over 5,000 m²

of test surface

ASSESSMENT

  • Performance of a HAZOP in the preparatory phase
  • Use of an extractor with a capacity of 1500 m3/h and 500 mbar of depressurization
  • Use of a CATOX for gas treatment
  • Use of ATEX components
  • Continuous oversight and monitoring with remote management
  • Precise dimensioning of the treatment with cost and time estimations