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MCN- Northern Sweden Soil Remediation Center
New article about green liquor dregs from LTU PDF Print E-mail
Written by Andreas Drott   
Wednesday, 10 October 2012 09:46

Green liquor dregs (GLD) are the largest waste fraction retrieved at the sulphate pulp mill. GLD has a low hydraulic conductivity and is alkaline which opens the possibility of using it for construction of sealing layers. Two sites have been sampled where the GLD age is known. The effect of aging on the material properties specifically the ability to function as a barrier against oxygen and its capacity to buffer in the long term was studied. The mechanical strength has also been evaluated to asses if it can withstand the pressures from the cover layer. Suction tests showed that the capillarity forces in GLD bind water strongly to the particles preventing it from drying. The high water content in GLD and the strength of the water bounding are major advantages for the use in sealing layers to create a water saturated layer preventing oxygen penetration. GLD is therefore believed to be an excellent barrier material in the sealing layer. The GLD’s buffering capacity is high and the results indicate that it will last for a long time which is consistent with its large reservoir of lime. The shear strength increased when the GLD is placed in field conditions.

Assessment of the effect of aging on green liquor dregs cover for tailings deposits: Field investigation

Mäkitalo, M. , Lu, J. , Stahre, N. , Maurice, C.&Öhlander, B.2012 in: Proceedings of the 8th International Conference on the Environmental and Technical Implications of Construction with Alternative Materials . Arm, M., Vandecasteele, C., Heynen, J., Suer, P. & Lind, B. (red.). ISCOWA, page 5.

Last Updated on Wednesday, 10 October 2012 09:48
 
New article within the project about green liquor dregs at LTU PDF Print E-mail
Written by Andreas Drott   
Wednesday, 10 October 2012 09:42

This study focuses on the effect of green liquor dregs (GLD) and fly ash (FA) on geotechnical stabilization of tailings, using shear strength test.
The objectives were to evaluate thickening of tailings using GLD to paste to improve its water retention and to reduce waste percolation, to identify optimal proportion of additives regarding geotechnical stabilization of tailings, and to study the role of FA in the decrease of porosity and thus to reduce oxygen diffusion via hardening process.
The results showed that GLD is a potential material for tailings stabilization by decreasing water percolation and improving water retention property. However, the paste of GLD amended tailings withstands low shear strength. The addition of FA to the paste greatly improves shear strength which is up to 2-3 times higher. Moreover, the fly ash hardening process effectively reinforces the strength of GLD amended tailings paste. Longer curing period (3 months) for specimens leads to up to 2-3 folds higher strength compared to that of 1 month. Hydraulic conductivity is reduced as a result of GLD and FA addition, since the porosity of the tailings decreased. If reduced porosity, improved water retention capacity and no cracks are ensured in the tailings, oxygen diffusion can be limited.

Use of rest products as additive in tailings paste for the mitigation of ARD: Effect of green liquor dregs and fly ash addition on geotechnical stabilization of tailings

Jia, Y. , Stenman, D. , Mäkitalo, M. , Maurice, C.&Öhlander, B. 2012 i: Proceedings of the 8th International Conference on the Environmental and Technical Implications of Construction with Alternative Materials . Arm, M., Vandecasteele, C., Heynen, J., Suer, P. & Lind, B. (red.). ISCOWA, page 7.

Last Updated on Wednesday, 10 October 2012 09:48
 
New article on phytostabilization of arsenic in mine spoils PDF Print E-mail
Written by Andreas Drott   
Tuesday, 04 September 2012 09:16

Aided phytostabilization using a combination of compost, zerovalent iron grit and coal fly ash (CZA) amendments and revegetation effectively promoted the biological recovery of mining spoils generated at a gold mine in Portugal.

Last Updated on Tuesday, 04 September 2012 09:22
Read more... [New article on phytostabilization of arsenic in mine spoils]
 
γH2AX, pChk1 and Wip1 as potential markers of persistent DNA damage derived from Dibenzo[a,l]... PDF Print E-mail
Written by Andreas Drott   
Tuesday, 07 August 2012 09:29

New article within the PACMAN project:

Polycyclic aromatic hydrocarbons (PAHs) are formed during incomplete combustion of organic material and are ubiquitous environmental contaminants. High levels of PAHs are commonly found in soils at industrial sites, thereby constituting a risk for humans and the environment. However, this risk is often difficult to estimate due to the complexity of the contamination. In the present study, we investigated the cellular DNA damage response induced by extracts of PAR-contaminated soils collected at various industrial sites in Sweden.

Last Updated on Tuesday, 07 August 2012 09:31
Read more... [γH2AX, pChk1 and Wip1 as potential markers of persistent DNA damage derived from Dibenzo[a,l]...]
 
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