Managing Soils a Consultant’s Perspective
Transcript of Managing Soils a Consultant’s Perspective
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Managing SoilsA Consultants Perspective
Presented by Roger Parker
Golder Associates Pty Ltd
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Overview
Soil Remediation in Victoria Soil Remediation Options Treatment and management methods
HWCC Contaminated soil outcomes Buffers Design of a Soil Treatment Facility What would it treat ? What would it look like ? Where should it be ?
Concluding Remarks
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Soil Remediation in Victoria
BP Pt Melbourne First major cleanup Technology soil washing first use of soil
treatment technology in Victoria
Ardeer Battery recycling
Commencement of Auditing of ContaminatedLand
Audit System Independent sign-off for land suitability Unique (?) system now being copied
elsewhere in Australia and internationally
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Soil Remediation In Victoria
Common forms of remediation in Victoria (andAustralia):
Manage contamination on site: Under buildings In secure areas (on-site containment) Excavate and remove to landfill Land farming (hydrocarbons) really only
suitable for low volatility contaminants Some stabilisation Dilution ? Others ?
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Future Management of Contaminated Soil in Victoria
Publication 878 classifies soilcontaminated with TPH, MAH,OCcompounds and PAH as waste forwhich reuse, recycling, recovery ofenergy and treatment opportunities willbe available in the near future
When facilities available EPA willmodify landfill licences to preventdisposal of these materials
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Common Methods of Treating Soil
In situ Soil vapour extraction Soil stabilisationBioremediation Ex situ Bioremediation Thermal desorption Washing (water or chemical) Stabilisation followed by reuse or disposal Treatment may not render soil clean. May
only lower concentration enabling managedreuse or disposal
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Leachatecollectiondrain
Leachate re-circulation
and irrigation
Vacuumpump
Slotted pipe forair extraction
HDPE liner
AirTreatment
Moisturepot Soil mixture
Emission
stack
Leachate holding tank
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Hazardous Waste Consultative Committee
Late 1990s the HWCC was formed to look atissues associated with generation andmanagement of hazardous waste in Victoria
Final report in April 2000 Some recommendations related to management
and treatment of contaminated soil
Recommendations largely accepted byGovernment
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Hazardous Waste Consultative Committee
That, where practicable, category A and B soils be treated toreduce their level of hazard to, at least, Category C level sothey can be legitimately reused on-site, or in some otherapproved offsite use (including as cover in appropriatelyengineered landfills). In the cases of those Category A soils,characterised by metal or persistent organic contaminantswhich cannot be readily or safely treated, the EPA may
determine that there is no practical alternative but stabilisationand encapsulation prior to containment.
Comment Category A, B, C yet to be defined
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Hazardous Waste Consultative Committee
That the Government encourage and facilitate theestablishment of appropriately sized, designed and located
soil remediation facilities(which may operate as soil banks) to maximiseopportunities for diversion of contaminated soil intolegitimate forms of reuse or storage.
Comment: Practicality of soil banks may be an issue.Who wants soil that with a contamination pedigree?
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Design of a Soil Treatment Facility
What should it treat? Depends on sites being developed (mostremediation driven by redevelopment) Nature of contamiantion and type of soil willvary Common contaminants: TPH and BTEX PAH Metals Melbourne (and surrounds) soils generally
clayey Extent of treatment Depends on soil and waste Cost Regulation ability to reuse or availability of
disposal options
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Bioremediation
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Soil Stabilisation
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Thermal Desorption Plant
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Design of a Soil Treatment Facility
What should it look like? Fenced site Gatehouse and waste receipt Office, workshop and laboratory (?) Building and paved area for waste receipt,storage and sorting Systems for sorting (eg screening) Stormwater and waste water systems Power supply Area for bioremediation Stabilisation plant or area Thermal treatment plant? (depends on
market)
Other ? (depends on market and proprietarysystems available) Most important land available for treatment tosuit the contaminated soil that needs treatment
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Design of a Soil Treatment Facility
Possible layout design
StockpileArea
StockpileArea
Bio-treatment
Area
TechnologyTreatment
Area
TechnologyTreatment
Area
WastewaterStorageBasin
(to treatment
system)
FutureWastewater
StorageBasin
Emission StackControl Area
0m 50m 100m
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Design of a Soil Treatment Facility
Where should it be? Somewhere near the source of
waste (not far from MetropolitanMelbourne)
An old landfill would be anappropriate site 200 m buffer is sensible
Generally industrial surroundingthe buffer
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Concluding Remarks
Currently less high levelcontaminated soil being generated Greater interest in treatment
Treatment site needed whereremediation on site is not practicable orwhere time is an issue Still expect on site treatment and onsite management to be preferredoptions We need a site with a licence withflexibility to meet market demand
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