1. SOKCHO, August 29th WORKSHOP ENVIRONMENT ACTIVE WALL PROCESS

2. SOKCHO, August 29th PERMEABLE AND REACTIVE BARRIERS J.J. KACHRILLO Environmental department director

3. SOKCHO, August 29th PRINCIPLE ACTIVE BARRIER Polluted water Treated water ACTIVE BARRIER WATER TABLE FLOW

4. SOKCHO, August 29th PRINCIPLE SCHEME OF AN ACTIVE BARRIER WITH FILTERING GATES

5. SOKCHO, August 29th SOME REFERENCES RETENTION –AUBY 1998. THC, PAH –CLIPPER OIL 2000. THC, PAH –BREST LAGUNE 2001. THC –FRANIERE 2002. Arsenic DESTRUCTION –SOLVA CHEMIE 1999. Chlorinated solvents –ZWEVEGEM 2002. Chlorinated solvents

6. SOKCHO, August 29th AUBY-CdF : Plan view of barrier

7. SOKCHO, August 29th AN APPLICATION OF KEOPS PROCESS SOLVA CHEMIE : Plan view

8. SOKCHO, August 29th SOLVA CHEMIE Results after 15 days operation

9. SOKCHO, August 29th CLIPPER OIL (Barcelona-Spain) General plan of the barrier

10. SOKCHO, August 29th BREST LAGUNE : Example of an original conception associating stabilisation and active containment.

11. SOKCHO, August 29th ZWEVEGEM (Belgium) KEOPS PROCESS General plan of the barrier Underground water table flow Geological features clayey sands from ground level down to 12 m impervious clay (K<10 -9 m/s) at 12 m Contamination set of chlorinated solvents up to 1,9 g/l (hot spots) 60 mg/l at the gates inlet (gate 3) Goals of the treatment TCE < 70 µg/l DCE < 50 µg/l PCE < 40 µg/l CV < 5 µg/l

12. SOKCHO, August 29th ZVEWEGEM Scheme of a filtering gate

13. SOKCHO, August 29th ZVEWEGEM Installing a gate (1). The slurry panel is perpendicular to the sheet piles wall

14. SOKCHO, August 29th FRANIERE TAILINGS (Belgium) works in preparation (pollution by As) 3000 µg/l 50 µg/l 400 µg/l 200 µg/l

15. SOKCHO, August 29th Soletanche-Bachy/ETI Soletanche-Bachy –Wider range of applications (chlorinated solvents, cyanides, arsenic, TPH, PAH) –Deal with clogging due to possibility of easy filter change –Able to give long-term guaranty if maintenance –Simple installation possible down to 40 m –Works without energy ETI –Only chlorinated solvents –Clogging not solved –Guaranty only 6 months due to problems of clogging –Difficulties to install if more than 10 m depth –Cheap reagent but weaker efficiency –Works without energy

16. SOKCHO, August 29th Conclusion : An innovative, efficient and cost-effective method An alternative to complete containment and pump and treat A curative and preventative solution to guarantee good groundwater protection A cost-effective : 2 to 3 times cheaper than complete containment and works without energy Well-suited to major pollution problems where water resources are in danger A real site maintenance contract

17. SOKCHO, August 29th ACTIVE WALL PROCESS *** ADVANTAGES AND APPLICATION OF PROCESS FOR KOREA *** Rehabilitation of former industrial sites. Increase in value of polluted lands: real estate development Guarantee of decontamination in progress in case of property’s transfer. Can be easily adapted to Korean law:

18. SOKCHO, August 29th PATENTS