solution provider bij bodemsanering leading in soil and groundwater remediation solution provider...

Solution Provider bij bodemsanering

Leading in soil and groundwater remediationSolution Provider bij bodemsanering

Leading in soil and groundwater remediation

SARCLE-2010: Steam enhanced ISR and

CO2-footprint

> 20 years experience Groundwater Technology

Eric de Zeeuw


Steam enhanced ISR

Principle

•Steam heats up the soil

•Heat accelerates the clean up processes

•Heat/Energy ‘releases’ captured product

•Extraction recovers mobile contaminants

•Costs a lot (€, energy and CO2)???

Heat enhanced process

Not ContaminatedSoil particles (grey) surrounded by bonded water (dark blue). The rest of the pores filled with groundwater

ContaminatedSome pores contain free phase product (oil). Oil is ‘trapped’ in pores by touching layers of bonded water.

Increased temperature:Thickness layer of bonded water decreases. Viscosity decreases. Solubility and reaction rates increase.

Elevated temperature:Virtually no bonded water. Viscosity is low. Product no longer ‘trapped’. Boiling point of product/water mix is lower than < 100°C

Boiling point exceeded:No liquid water present. Boiling water (steam) expands 1200 fold. Oil completely free to flow.Low viscosity, high vapour pressure.

After remediation:Almost all product removed. Some residuals adsobed onto soil particles

Cooling down startsGroundwater returns. Layer bonded water returnsResidual contamination remains strongly adsorbed onto soil particles

Cool down progressesLayer bonded water increasesResidual contamination remains strongly adsorbed onto soil particles. Only contamination that is not mobile at > 100°C is left

Cool down completeResidual contamination remains strongly adsorbed onto soil particles. Only contamination that is not mobile at > 100°C is left. Residual contamination will gradually biodegrade.

Remediation completeAny residual contamination is demonstrated stable. No migration, no exposure, no ecological risk. Residual contamination will gradually biodegrade.

Temperature probes

Temperature distribution (3D)




Case

Heat Enhanced Remediation

OfLight Cycle Oil

ISSUE

Light Cycle Oil (similar to diesel) spill

• 300 m3 spilled, 15.000 m2 contaminated

• Initial response: recovery (10 -20 m3 remain)

• Immediate action: containment via DM-VEX

• Remedial actions: evaluated

SITE OVERVIEW

OPTIONS

Three solutions were considered:

1.Excavation– Technically complicated, Expensive (> €2M)

2.Multi-phase extraction & in situ bioremediation– Time (3+ years), residual contamination

3.Heat enhanced remediation– Quick (3 rounds, 2 months each)– Low residual contamination– Costs equivalent to in situ bioremediation

Containment

• High-vacuum multiphase extraction: no migration

Remediation

• 3 injection events for a period of 2 months for each event

• Residual of Light Cycle Oil: below detection

RESULT

RESULTS

0

100

200

300

400

500

600

700

800

900

1000

24-mrt 3-apr 13-apr 23-apr 3-mei 13-mei 23-mei0

50

100

150

200

250

300

350

Stoominjectiedebiet [kg/h]BLELucht debiet[m3/h]

0

10

20

30

40

50

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80

90

24-mrt 3-apr 13-apr 23-apr 3-mei 13-mei 23-mei

BLE vóór koeling

BLE ná koeling

GWO

After coolingBefore cooling

Discharge to foul was not to exceed 70o C

RESULTStotaal vrachtverwijdering BLE [kg]

0,00

500,00

1000,00

1500,00

2000,00

2500,00

3000,00

19-3-2007

29-3-2007

8-4-2007

18-4-2007

28-4-2007

8-5-2007

18-5-2007

28-5-2007

7-6-2007

17-6-2007 totaal vrachtverwijdering BLE [kg/dag]

0

30

60

90

120

150

19-3-2007

29-3-2007

8-4-2007

18-4-2007

28-4-2007

8-5-2007

18-5-2007

28-5-2007

7-6-2007

17-6-2007

Datum

Vra

cht

verw

ijd

erd

in

kg

/dag

TIME & COSTS

Action Duration Cost estimate

Containment 2 years € confidential

Steam injection, per batch

2 month € 200.000

Carbon Footprint Method

SKB-project Carbon Footprint Soil Remediation

Project management TAUWMembers: Groundwater Technology

(and others)Result: Spreadsheet Model Calculation

CO2 emissions


Case GT

• Surface: 500 m2

• Depth: 10 m• Volume: 5000 m3

• Contamination: Creosote and Oil• Average concentration: 10.000 mg/kg• In groundwater: max. 120.000 ug/l• Soil consisting of fine sands, layered,

some loam and clay layers


Comparison of D&D vs. STI

• Dig and dump:• Excavation in controled by sheet piles• Refill with clean sand• Groundwater treatment during 3 years

• Steam enhanced Extraction• Complete removal of all contaminants• During 60 days


Result: CO2 Dig and Dump

• CO2 emissions totally 2008.7 Tons, mainly transport and treatment


Result: CO2 Groundwater

• Water treatment 159.5 Tons, extraction 6.2 Tons CO2


Resultaat: CO2 Steam

• 1,021.6 Tons CO2 emissions, 2/3 part Steam production

Steam production

Vergelijking technieken


Conclusions

1. Steam enhanced In situ remediation leads to less emissions of CO2 compaired to dig and dump

2.Yet, Innovations are possible to further deminish the emissions and improve the Carbon Footprint


Innovations

1.Optimalisation of the proces control saves time, costs and energy

2. Use surplus steam, that is available on many industrial sites

3.80% of the contaminants are removed with the vapour phase

4.With a RSI (ICE) unit can produce electricity using the contaminants as a fuel source


ICE unit


• Internal Combustion Engine (ICE) at 1760° C

• Automated air-fuel ratio control system

• Contamination used as fuel for engine

TECHNOLOGY


ADVANTAGES

• Mobile & self-supporting

• Continuous automatic control

• High intake concentrations

• Energy production of up to 30kW/hr




Groundwater Technology BV

Sheffieldstraat 13 Postbus 121153047 AN Rotterdam 3004 CG Rotterdam

Tel: +31 (0)10 238 2850Calamiteiten: +31 (0)10 238 2868

Fax: +31 (0)10 238 2869

E-mail: [email protected] Web: www.gtbv.nl

Thank youfor your

attention

solution provider bij bodemsanering leading in soil and groundwater remediation solution provider...

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