20.500.12556/DiRROS-16884 Remediation of contaminated soil by red mud and paper ash Remediation of contaminated soil can be performed by using various techniques, which must be adequately tailored for each specific case. The aim of this research is to critically evaluate the potential use of red mud and paper ash and a combination of the two as immobilization additives for the remediation of contaminated soil from one of the most polluted sites in Slovenia. The proposed procedure involves the preparation of geotechnical composites made from contaminated soil and mixed with 25 wt% of immobilization additives and an optimal quantity of water to achieve consistency, at which maximum compaction according to the Proctor Compaction Test procedure can be achieved. The results reveal a positive, time-dependent trend for the immobilization of potentially toxic elements in the composite with paper ash, because of the formation of the new hydration products with potentially toxic elements. In a composite containing only red mud, potentially toxic elements were immobilized by sorption mechanisms with no general time-dependent trends. The composite with a combination of additives demonstrates the remediation characteristics of both red mud and paper ash. Using this approach excavated contaminated soil, red mud and paper ash can be successfully recycled in the proposed composites, which can be beneficially used in situ for rehabilitation of contaminated sites. Nevertheless, mobilization of some potentially toxic elements at high pHs may represent a limiting factor and has to be taken into the consideration when a combination of red mud and paper ash is used as immobilization additive. red mud paper ash contaminated soil potentially toxic elements geotechnical composites true false true Elsevier Angleški jezik Ni določen © 2020 The Authors. Published by Elsevier Ltd. Neznano 2023-08-31 09:08:42 2023-08-31 09:23:34 2023-09-01 03:35:15 0000-00-00 00:00:00 2020 0 0 120440; str. 1-10 Vol. 256 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2020-02-07 55 0959-6526 10.1016/j.jclepro.2020.120440 1548126 https://www.sciencedirect.com/science/article/pii/S095965262030487X?via%3Dihub 1 7371a47a-47bc-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22945 RAZ_Oprckal_Primoz_2020.pdf RAZ_Oprckal_Primoz_2020.pdf 1 04CC01FAEDEA4354F7C2C6F29204A593 876bfc8fc252bec746048bab77b3f0d8e225c9056ea148f47518c4e8e3b51fbc 46ca5dd1-47be-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22946 RAZ_Oprckal_Primoz_2020.docx RAZ_Oprckal_Primoz_2020.docx 1 70A58E243465C3033B75E87B88C805A9 2ab3f3a6b4743972cedcd091b5508d6f47a3350b87b94d50341b8997e61c7b39 82cbc896-47be-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22947 Zavod za gradbeništvo Slovenije 0 0 0