Challenges in Soil Remediation

Transkript

1 Challenges in Soil Remediation Ulrich Gosewinkel Karlson National Environmental Research Institute University of Aarhus Roskilde

2 WP4 COWI Ninna Dahl Ravnsbæk DTU Env Stefan Trapp Sanne Skov Nielsen Rasmus Jacobsen Peter Kjeldsen AU - NERI Philipp Mayer Ulrich Gosewinkel Karlson

3 Vision

4 Vision Recovery of contaminated soil as a resource

5 Vision Recovery of contaminated soil as a resource Stabilization

6 Soil Contamination* * heavy metals or PAHs

7 Concept non-accessible accessible

8 Concept non- available available

9 Concept non-accessible accessible

10 Concept non-accessible accessible

11 Concept non-accessible accessible

12 Concept non-accessible accessible

13 Concept non-accessible accessible

14 non-accessible accessible Problem or Solution?

15 As, Cr non-accessible accessible

16 As, Cr non-accessible Make it all non-accessible!

17 Ochreous Sludge: Waste product from drinking water treatment - Usually landfilled or incinerated - Contains some unwanted trace elements (Cd and As) 80% highly reactive iron oxide - Excellent sorbent of anions - Arsenic and Chromate BUT will probably dissolve if soil gets flooded

18 Field experiment As contamination Porewater in untreated soil: mg/l Porewater in treated soil: mg/l Arsenic in porewater [mg/l] aug sep nov jan feb apr jun Untreated soil Treated soil Natural iron oxides in soil dissolves Arsenic is released Limited release of arsenic Formation of Fe(III)AsO 4 (s)?

19 So far Ochreous sludge minimizes leaching of As and Cr -- and it seems to be more stable than expected Further Research - Aging of ochre - Practical application - Economic evaluation

20 PAHs non-accessible accessible

21 PAHs non-accessible accessible Degrade it!

22 PAHs non-accessible accessible Make it safe!

23 Bioremediation traditional goal non-accessible accessible cleanup

24 Bioremediation non-accessible accessible?

25 Bioremediation non-accessible accessible Problem!

26 Exposure reduction non-accessible accessible

27 Exposure reduction non-accessible accessible Advantage?

28 Hypothesis non-accessible accessible Exposure of sensitive receptors is reduced significantly

29 Traditionally Soil Bioremediation = Method for soil cleanup

30 Soil Bioremediation = Method for exposure and risk reduction

31 Measuring techniques Determination of chemical activity accessibility non-accessible fraction Prediction of biodegradability Prediction of plant uptake Toxicity testing Validation of concept

32 Prediction of biodegradability:

33 Prediction of biodegradability: Rapid quantification of the non-accessible fraction

34 Prediction of biodegradability: Rapid quantification of the non-accessible fraction

35 Prediction of plant uptake

36 Uptake pathways Exchange with air Particle deposition Direct soil contact Diffusion Xylem & Phloem transport Translocation in xylem Soil air plant Advective uptake with water

37 Crop-specific models for transfer into diet Meat Milk Cereals (Models: Trapp (95, 02, and 07), Travis & Arms (88), and TGD (03)) Fish

38 Challenges in Soil Remediation?

39 New Concepts in Soil Remediation!

40 New Solutions in Soil Remediation

41

42

43 Biostabilisation: Old bioremediation techniques Stimulation of bacterial activity Phytoremediation leaching + bacterial activity + oxygen + plant uptake Organic amendments + artificial humus (possible connection to sprækker )

44 Opstart af præsentation Start med at på mastersiden og indskriv titlen på din præsentation. Gem og vælg nyt dias Vælg Designknap øverst til højre i menulinie Træk ønskede layout ind fra højrespalten Udfyld tekstfelter og indsæt billeder/grafik Formatér grafikken til DMUfarver sæt god størrelse på tekst i grafik Vær OBS på at du ikke har mere end det anbefalede på siderne ellers opdel

45 Anvendelse af fotos Indsæt foto Klik på billede, vælg ikon i menulinie, komprimér til skærm (96 dpi) og slet fraskårede dele af billede Rediger farvestyrke og kontrast for at gøre billedet optimalt Se forskellen på det indsatte billede

46 DMU farver til præsentationer

47 PAHs non-accessible accessible Degrade it!