Presented by Paul J. Garrett
Regional Manager CHURNGOLD Remediation LimitedDATE 5th June 2006
Small Sites in Urban Areas
Outline of Presentation
Brief summary of sitesConceptual models System designs System performance
Comparisons of Cost & Performance
Conclusions
Site in South East England
Conceptual Model
• Former Petrol Filling Station (PFS) located in urban area (bordered by residential housing)
• Gross petrol range contamination (inc. BTEXs) in soils and groundwater
• Free Product Encountered
• SSTL’s derived from QRA – effectively a 90-99% reduction required
• Geology – Sands and gravels – Weathered Sandstone
• Client wants quickest solution possible!
Site in South East England
Proposed Treatment Solution
Proposed Solution – Steam Enhanced Remediation
Programme
Start of the project
Day 0
Start of treatmentDay 103
End of treatmentDay 193
Completion of Validation
Day 277
On SiteDay 55
Performance
D PVE1D PVE4
D PVE5
D PVE10
D PVE14
D PVE19D PVE22
D PVE18
D PVE13
D PVE9
ST1ST2
ST3ST4
ST5ST6
ST8 ST9 ST10ST11
ST13 ST14ST15 ST16
ST17ST18 ST19 ST20
ST7
ST12
D PVE2D PVE3
D PVE6 D PVE7 D PVE8
D PVE11D PVE12
D PVE15D PVE16
D PVE17
D PVE20D PVE21
Baseline 17th February 2005 Results
Cumulative Mass Recovery Curve for Xylene Vapours
Increasing temperatures increases treatment rates
DPVE1DPVE4
DPVE5
DPVE10
DPVE14
DPVE19DPVE22
DPVE18
DPVE13
DPVE9
ST1ST2
ST3ST4
ST5ST6
ST8 ST9 ST10ST11
ST13 ST14ST15 ST16
ST17ST18 ST19 ST20
ST7
ST12
DPVE2DPVE3
DPVE6 DPVE7 DPVE8
DPVE11DPVE12
DPVE15DPVE16
DPVE17
DPVE20DPVE21
DVPE23
58 Days Since Commissioning: 18th April 2005
Results taken from a similar project 5mins away from site
Site in Midlands
Conceptual Model
• Another Petrol Filling Station (PFS) – contaminated with petrol range contamination
• Geology is very similar – sands on top of weathered sandstone
• Free product encountered
• SSTL’s delivered from QRA – 90-95% reductions required
• Client’s not concerned with timeframe
Proposed Treatment Solution/Programme
Site in Midlands
• Phased approach proposed
• Free product skimming using vacuum enhanced pumping (3months)• Bio-venting• In-situ Bioremediation using Oxygen Infusion
Timeframe for treatment = 60 months
Performance
Results below taken from project using similar technology
0
10
20
30
40
50
60
Baseline: Based on Pre-Remediation Data
Baseline: Based on CRLdata
After 1 Year of Treatment After 2.5 Years ofTreatment
Ma
ss
Ba
lan
ce
(k
g)
Mass Balance Calculation
Comparing Costs and Performance
SER SYSTEM – Total cost: €353,300 (£240,000)
More complex engineering required More expensive to run (fuel costs for boiler etc) Needs more engineers to operate (2no. full time) and manage Health & Safety
VACUUM/BIO SYSTEM - Total cost €125,100 (£85,000)
System engineering less intensive System has minimal power requirements Very reliable, hence needs little operations (1 visit per month)
Cost & Performance Comparison – Engineering Cost
The SER system needs complex engineering Upfront detail design/licensing Steam generator High vacuum extraction system Heat exchangers Treatment plant (GAC filters) Control system – (auto shutdown/temperature monitoring)
35% of total cost - €123,500 (£84,000)
The Bioventing/In-situ Bio is mostly Down well units Control system Compressor system
65% of Total costs - €81,300 (£55,250)
Cost & Performance Comparison – Running Costs
The SER system will generate “hot” waste streams Additional monitoring to ensure Health & Safety maintained Needs treatment (GAC consumption, discharge to sewer) Needs initial heating (fuel consumption)
42% of total cost - €141,00 (£96,000)
The Bioventing/In-situ Bio system “after initial skimming phase” Low power required (oxygen injected via pressurised cylinders) No waste stream generation
6% of Total costs - €7,500 (£5,100)
Cost & Performance Comparison – Man Power
The SER system needs fulltime operation/management During heating 2no. Engineers During cooling 1no. Engineer Additional project management (Health & Safety)
25% of total cost - €88,300 (£60,000)
The Bioventing/In-situ Bio system needs routine maintenance only
System looks after itself Has little to go wrong Is inherently safe
29% of Total costs - €36,300 (£24,650)
Conclusions
More powerful solutions such as SER will get you there quicker!
They also get you there with more certainty
More powerful solutions come with a higher running cost
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