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presentatie detectie puur product Linksa Asse Belgium

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The subject site is located in Asse, Belgium and was used for fabrication and storage of glues and tar containing asphalt products. Due to a fire, a distillation unit of 30 tonnes and a filled storage ...

The subject site is located in Asse, Belgium and was used for fabrication and storage of glues and tar containing asphalt products. Due to a fire, a distillation unit of 30 tonnes and a filled storage tank of app. 40 m³ taroil were destroyed.

The Public Waste Agency of Flanders (OVAM) is responsible for the clean-up of the site. An excavation of the superficial DNAPL contamination has already been executed. However, the DNAPL of tar products on the clay-layer at a depth of 14 to 15 m bls still needs corrective action.

Commissioned by OVAM, a pilot for in-situ chemical oxidation (ISCO) with Fenton’s Reagens has been executed on the site. A reasonable reduction of the contaminant load (app. 90%) was obtained.

In order to make a well-founded BATNEEC-evaluation, the DNAPL is further characterized in detail, as the exact volume/proportion and contaminant load will determine the final remediation costs. This characterisation is obtained by using the Rapid Optical Screening Tool (ROST™) of Fugro. ROST™ detects aromatic hydrocarbons by means of a Laser Induced Fluorescence (LIF) technique.

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    presentatie detectie puur product Linksa Asse Belgium presentatie detectie puur product Linksa Asse Belgium Presentation Transcript

    • Localisation and remediation of aDNAPL-contamination of PAH’s at the former Asphaltco site Karel Van Nieuwenhove, Koen Meskens (Soresma nv), Frank Pels (HMVT), Koen Janssens (OVAM)
    • Summary of presentation» Introduction › Site description › Characterization of the contamination › Site Development Plans › Already executed remediation › Remediation of the second DNAPL» Further characterization of the contamination: detection by ROST › Principle › Results: › Hydro geological build-up of the underground › Semi-quantitative determination of the contamination» Site remediation: Pilot test › Materials and methods › Results › Conclusions» Future perspectives
    • INTRODUCTION Site description » Location: Belgium, Asse, Molenstraat 48-50 » History: › < 1900: horticulture › 1912-1920: production of glues › 1920-1986: fabrication of glues and tar containing asphalt products (Asphaltco) › 1985-1997: several companies and illegal dumps › 2005: demolition of the site » Calamity: fire › 1942 › Destruction of distillation unit of 30 tonnes and filled storage tank of app. 40m³ tar oil › Extinguished with foam containing tetrachloromethane
    • INTRODUCTION Characterization of the contamination» Contamination in soil and groundwater maaiveld › PAH › Mineral oil 7m › Benzene pilot 12 -14 m › Phenols and cresols klei» DNAPL’s of tar lid van Asse 14 m › 7.0 m bgl (Lid Van Onderdijke) › 14.0 m bgl (Klei van Asse)
    • Introduction Site Development Plans » Acquired by the local community » Fire department, youth house, sport tracks,... » Local depot for busses (De Lijn) » Large parking lot for the train station » OVAM will remediate the site
    • Introduction Already executed remediation » Demolition of the site (2005) › Cost: 500.000 euro » Remediation of the dumping ground (2006) › Cost: 950.000 euro » Excavation contamination until 5.0-6.0 m bgl (2007) › Total cost excavation (removal and remediation of contaminated soil): 8.150.000 euro
    • Introduction Remediation of the second DNAPL Remedial Action Plan originally said: » Combination of steam injection and Electrical Resistance Heating » Followed by In-situ Chemical Oxidation OVAM chose to directly perform a pilot study for ISCO
    • Further characterization of thecontamination » Determination optimal location pilot test » More detailed delineation of the DNAPL zone By » Camera probing » ROST probing
    • Further characterization of contamination Camera probing » The camera probe is inserted in the underground by means of regular probing equipment. » Simultaneously video-recordings are made from the underground. » The camera probe consists of: • Stainless steel tubing (Ø 44 mm, ca 1 m) • Saphire sight flow glass: 5 by 7 mm • Behind which a lamp, a mirror and a camera are placed. • Viewed 100 times enlarged on the monitor » Grain size and colour of the soil, oil particles, gasbubbles but also contamination like tar are visible tar
    • Further characterization of contamination Cameraprobing – examples
    • Further characterization of contamination ROST probing » Principle: ROST = Rapid Optical Screening Tool
    • Further characterization of contamination Principle (2)
    • Further characterization of contamination Results: » Semi-quantitative determination of the contamination DNAPL
    • Further characterization of contamination Results: » Geological cross sections Dwarsdoorsnede AA Dwarsdoorsnede BB Puntweerstand Puntweerstand S 00 1 S3 S6 S9 S1 1 V B1 U A S100 S3 S102 S103 S104 0,00 0,00 P S3 W 2,00 P S3 W 2,00 P S100 W P S6 W P S102 W P S9 W P S103 W 4,00 P S11 W 4,00 P S104 W P S100 W VUB1A 6,00 vermoedelijke verspreiding (niet af geperkt ) 6,00 Zand van Buisputten Zandvan Buisputten puur product in de klei van Asse diepte (m -mvS4)diepte (m-mvS4) 8,00 K van Zomergem lei 8,00 Klei van Zomergem zandige tussenlaag zandige tussenlaag 10,00 10,00 minder doorlatende laag minder doorlatende laag Zand van Onderdaele Zandvan Onderdaele 12,00 12,00 minder doorlatende laag 14,00 14,00 K van Asse lei Klei van Asse 16,00 16,00 18,00 18,00
    • Further characterization of contamination Contamination cross section
    • Site remediation Pilot test : ISCO remediation » Materials and methods: › HMVT bvba. – Soresma nv. › 2 stages (May and July 2007) › Area: 10 x 15 m² - 12 injection points (screen depths of 13.0-14.0 m-gl.) › Injection of Fentons reagens (conc. of 5 to 10 %)+ catalyst (Fe2+-sulphate) › Vapor extraction wells (14)
    • Site remediation ISCO in action
    • Site remediation Pilot test : ISCO remediation » First results: Reduction of the contamination load with 80-95% m inerale olie 30000 25000 20000 Reduction MO first step: 73% 15000 10000 2-8-2007 23-5-2007 23-4-2007 Reduction MO second step: 83% 5000 0 M1 M2 M3 M4 M5 M6 2-8-2007 M7 INJ 1 INJ 6 ug / l INJ 9 INJ 12 punt e n PAK 16 25000 2-8-2007 20000 23-5-2007 23-4-2007 15000 10000 Reduction PAH first step: 82% 5000 Reduction PAH second step: 94% 0 M1 M2 M3 M4 M5 M6 2-8-2007 M7 INJ 1 INJ 6 ug/ l INJ 9 INJ 12 punt e n
    • Site remediation Pilot test : ISCO remediation » Conclusions : › At first: reasonable reduction was obtained › After 1 year: DNAPL contamination was restored › DNAPL levelled out from upper layers (non- treated) Before start After 4 months After 1 year
    • Future perspectives» Prior to ISCO a selective removal of the mobile DNAPL will be performed by specially designed pure product pumps => pilot test» Final characterization of DNAPL by ROST probing» Determination of risk based remediation values