The long-term evolution of and transport processes in a self-sustained final cover on waste deposits
2001 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 271, no 03-jan, 145-168 p.Article in journal (Refereed) Published
A new principle for confinement of waste based on a self-sustained seal is presented. The top cover is considered to consist of two main layers; an organic carbon rich surface layer that is able to support vegetation and an inorganic layer beneath it. The function of the cover is to mitigate oxidation and acidification of landfilled waste and hence the release of toxic metals. It is suggested that forest soil formation and soil development could prove to be valuable information sources for the study of the long-term behaviour of a final cover on waste deposits. Since the cover is expected to develop in northern temperate climate the focus is on Spodosol soil. A number of simulations of the long-term behaviour of the final self-sustained landfill cover are made, including the rates of influx of oxygen into the cover. A cover having a large portion of organic matter compared with a cover with no organics can considerably decrease the oxygen concentration and thus the influx of oxygen into a landfill. The calculated oxygen intrusion rate for the former case is of the order of 0.05 kg m(-2) year(-1). Degradation of the organics produces acids. Our simulations indicate that the pH-buffering capacity of the mineral layer, represented by calcite and primary rock minerals, will last for many thousands of years.
Place, publisher, year, edition, pages
2001. Vol. 271, no 03-jan, 145-168 p.
final top cover, solid waste, organic material, soil formation, litter fall, long-term, transport processes, oxygen, oxidation, heavy metal release, pH buffering, redox, modelling, root respiration, soil formation, forest soils, plantations
IdentifiersURN: urn:nbn:se:kth:diva-20578ISI: 000168401700012OAI: oai:DiVA.org:kth-20578DiVA: diva2:339274
QC 201005252010-08-102010-08-10Bibliographically approved