Conclusion on the supervision of the pilot test

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1 Conclusion on the supervision of the pilot test Oliver Trötschler & Hans-Peter Koschitzky VEGAS, University of Stuttgart Experience Exchange Day - pilot test Stuttgart July 19 th, 2013t What you can expect Why to perform a pilot test? Verifying thermal remediation concept Monitoring of process and remediation Heat propagation and limitations Mass transfer and limitations Hit the pilot s aim Supervision of Pilot Test 2

2 Why to run a pilot test? Will a ISTR be applicable and effective? Determination of mass extraction and heat propagation for two different geological layers (reasonable remediation goals) Determination of settlements and effects on surrounding buildings (safe application) Criteria and design of full scale remediation (heating, mass extraction and financial benefit) Complex subsurface structure of low permeability silts and clay sediments in the unsaturated zone and underlying limestone-like fractured rock (gypsum layer MGH) Supervision of Pilot Test 3 Heat balance and heat transfer concept to achieve 90 C and steamed saturated zone within 2 months 12 kw for unsaturated zone 16 kw vs. 35 kw for saturated zone (steamed) Mass fluxes and its determination devices in industrial quality, automatic readings and storage Process engineering and process control Verifying the concept flow sheet, industrial quality, remote control and web-based access Sampling and monitoring procedure representative number of samples, cost effective and automated Supervision of Pilot Test 4

3 Verifying the concept (II) 3 heaters unsaturated zone 4 heaters saturated zone 7 SVE wells, compressed air driven water and condensate extraction vacuum pump, condenser, cooling system, phase separation treatment using activated carbon to treat 100 m³ contaminated soil in 2 3 months heating Supervision of Pilot Test 5 Process control - power of heaters, Monitoring of plant and remediation (I) - SVE: mass flow, temperature and pressure, - condensation process: temperatures and flow, - groundwater: flow, temperature and pressures automatic readings and storage, remote control and web-based access Mass removal SVE by FID: all wells PE1-7 daily, total SVE every 15 min SVE via sampling: weekly, off gas and total SVE groundwater analysis: weekly Supervision of Pilot Test 6

4 Field data of remediation Monitoring of plant and remediation (II) Temperature monitoring (every 15 min) - seven control lances ST 1-7, 52 sensors - seven extraction wells PE1 PE7 Pressure monitoring of SVE in field (every 15 min) - three points in quaternary layer (ST4-5-7) - two points in MGH (ST5, ST6) groundwater table (every 15 min) - two measurement points MGH (ST5, ST6) - groundwater well P9047 Supervision of Pilot Test 7 Heat propagation and limitations Temperature profiles of ZOI (zone of interest) maps: Mr. Zanettin, VEOLIA Unsaturated zone: - 70 C limit reached (50 d) - 90 C achieved (75 d) Saturated zone and MGH unsat : - no steam in sat zone - steam desorption (50 d) Supervision of Pilot Test 9

5 Mass transfer and limits Unsaturated Zone of quaternary structure Mass removal: - removal rate strictly linked to heating - maximum reached for ZOI > 50 C - even during low temperature phase 100 g/h CHC removal High contaminant potential - Unexpected decline of CHC-production after heavy rainfalls (May) hydrolysis effects Supervision of Pilot Test 10 Mass transfer and limits Vadose and saturated zone of MGH (fractured rock) Mass removal: - removal rate slightly linked to heating (partially steamed midth of May) - maximum reached for ZOI > 30 C - high initial removal rate (50% of mass) High contaminant potential - Steamed zone in unsat` zone (PE6, 14/6/13) decline of mass removal Supervision of Pilot Test 11

6 Mass transfer and limits Effect of hydrolysis Temperature dependent hydrolysis of TCA to DCE and acetic acid - shift of ratio between DCE over TCA starting end of April (35 C in SVE) - due to low CHC concentration effect is approx. 25% of mass removal Supervision of Pilot Test 12 Hit the pilot s aim Decontamination of unsaturated zone works well Decontamination of dewatered part of the fractured rock aquifer also works well in case of steamed zone Complete dewatering of the aquifer required to steam off the contaminants, a challenge to be solved Settlements of soil level have been less than 1 cm Temperature limits have to be adopted criteria is contaminant removal rate Still in progress to exceed the temperature limits but pilot is basis for effective and safe application in fullscale at the site pilot shows that technique can be applied in urban environment cost efficiency still to be shown Supervision of Pilot Test 13

7 Acknowledgement The pilot application is funded by Supervision of Pilot Test 14 at the very end Dr.-Ing. Hans-Peter Koschitzky & Oliver Trötschler VEGAS, Versuchseinrichtung zur Grundwasser- und Altlastensanierung, Universität Stuttgart Supervision of Pilot Test 15

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