Innovation in bioremediation

Innovation in bioremediation Biostimulator Technology for Large-Scale Substrate Injection Experiences at the Vanderlande NL site Christian Soeter Technical WebEx Session Project Leader

Contents presentation Methods for substrate injection Bioremediation at Vanderlande Industries Installation bioscreens Starting situation contamination Implementation Biostimulator Experiences Process monitoring

Methods for substrate injection Infiltration & Pull Push Direct Push extraction 1 à 2 m 3 100 l per m R=0,5-1 m R=2-3 m R > 10 m

Bioremediation at Vanderlande Industries
Turn-key remediation for Vanderlande Industries in Veghel NL
Vanderlande Industries designs, builds and services baggage handling systems for airports all over the world
Contamination with chlorinated solvents of five hectare area
Mainly DCE and VC
no PCE or TCE left
Aim is a stable end situation for the contamination
Installation of 3 bioscreens in the plume
Source zone under buildings will not be treated

Situation bioscreens Vanderlande Contamination with DCE and VC 3 bioscreens at 4- 20 m -gl

Guarantees bioscreens Vanderlande
We offered following guarantees:
Decrease of 80 to 90% in the bioscreen
DOC-level > 10 mg/l in the bioscreen
Reduction of other parameters: nitrate, iron, sulfate
If necessary second injection round will be carried out

Biostimulator for injection of soybean oil emulsion
Scaling up production- and injection process
What is the yield for us ?
Bioscreens
Installation of 3 bioscreens with 116 injection wells total
At 4 levels: 6, 10, 15 and 20 m below ground surface
Design based on remediation plan

Drilling works Well screen Blind tube blind tube Well screen Well cover Cement Bentonite Gravel Bentonite Gravel Gravel Ground level 1 well/borehole 2 wells/borehole

Sonic drilling Small tractor Big tractor

Sonic drilling Small caterpillar Big caterpillar

Soil stratification Nuenen formation Depth Bioscreen 1 Bioscreen 2 Bioscreen 3 (m-gl) Borehole 1, 11 and 20 Borehole 21 and 35 Borehole 37 0 – 1 silty sand silty sand silty sand 1 – 2 sandy loam sandy loam 2 – 3 silty sand silty sand 3 - 4 sandy loam 4 – 9 fine sand fine sand fine sand 9 -10 fine sand with thin peat layers fine sand with thin peat layers fine sand with thin loam and peat layers 10-13 fine sand fine sand fine sand 13-14 fine sand with loam and peat layers fine sand with thin loam and peat layers 14- 16 fine sand 1st aquifer Fine sand with gravel fine sand with gravel 16 -17 fine sand with thin peat layers 17 -20 fine sand

Starting situation contamination NE NW Screen 1 Screen 2 Screen 3

Starting situation contamination Screen 3 Screen 2 Screen 1

Starting situation contamination DCE

Starting situation contamination VC

Summary starting situation
Concentrations DCE and VC are lower than in the past
Maximum concentrations: DCE 2100 µg/l and VC 1200 µg/l
Biodegradation circumstances: sulfate reducing
Substrate injection at depths where concentrations
were > Dutch intervention values
DCE – 20 ug/l
VC – 5 ug/l
80 wells treated instead of approximately 120 wells planned

Biostimulator setup Biostimulator and storage tanks Manifold on trailer

Soybean oil emulsion Soybean oil emulsion (microscope 100 x zoom)
Biostimulator has 2 mixing tanks and special mixing pump
Pruduces fine emulsion with small droplets of 2-10 µm
Slow-release substrate
Shock load injection
Emulsion of 10% soybean oil
Lifetime of five years

Using Biostimulator for injection of 160 m 3 (~42000 gallons) substrate in 80 wells
Storage tanks 3 x 5 m 3 (1320 gallons) for soybean oil and surfactant
Manifold on trailer with 20 connections for injection
Two deep wells for preparation of substrate
Fire hose for distribution of substrate
Two truck loads with 8 m 3 (~2100 gallons) soybean oil and 4 m 3 (~1050 gallons) surfactant
Substrate injection over distance of 300 m -> thresholds
Using biostimulator

Substrate injection Injection wells with injector heads Thresholds for distribution across the street

Substrate injection Flow control at manifold Pressure control at injection wells

Experiences
Injection team with 3 operators needed for biostimulator
Injection in 10 to 20 wells at same time possible
Daily injection of 25 m 3 (6600 gallons) substrate
Injection pressures range: 0,5 bar (7.3 psi) to 2,0 bar (29 psi)
Installation Biostimulator and filling storage tanks in 1 day
Injection in 80 wells with Biostimulator in 3 weeks
We tripled production and injection rate
Biostimulator cuts costs by some 30%

Process monitoring
Biodegradation of contamination: DCE and VC
Biodegradation products: Ethene and ethane
Field parameters: dissolved oxygen, ORP, pH and EC
Geochemical parameters:
nitrate, iron (II), sulfate, methane, DOC, chloride
Monitoring twice a year during 5 years

Monitoring DCE

Monitoring VC

Monitoring Ethene

Monitoring ORP

Monitoring sulfate

Monitoring DOC

Conclusions process monitoring
Concentration reduction in bioscreen: 90%
Ethene formation confirms complete biodegradation
Complete reduction of sulfate
DOC increased by injection of substrate
Substrate level is high enough for biodegradation

The End
Thanks for your attention !
Knowledge transfer
Come and see the Biostimulator in NL
...... Or, perhaps we bring the Biostimulator technology to you !

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Innovation in bioremediation

by Frank Pels on Oct 19, 2011

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Innovation in bioremediation — Webinar Transcript