Sulfidjord – Metod för hållbar hantering av uppschaktad sulfidjord : Redoxprocesser och försurningshastighet
Earthworks in sulphide soil areas almost invariably leads to more expensive project costs. A key factor is that almost all sulphide soil is classed as potentially acidifying which has halted the progress of developing alternative management methods for different types of sulphide soil. In addition,...
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ftluleatu:oai:DiVA.org:ltu-43062 2023-05-15T17:09:15+02:00 Sulfidjord – Metod för hållbar hantering av uppschaktad sulfidjord : Redoxprocesser och försurningshastighet Pettersson, Johannes 2016 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-43062 swe swe http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-43062 Local 0f9f6a4f-1207-4842-be82-151189153493 info:eu-repo/semantics/openAccess Technology Teknik Sulfidjord redoxsprocesser försurningshastighet oxidationsprocesser Student thesis info:eu-repo/semantics/bachelorThesis text 2016 ftluleatu 2022-10-25T20:52:45Z Earthworks in sulphide soil areas almost invariably leads to more expensive project costs. A key factor is that almost all sulphide soil is classed as potentially acidifying which has halted the progress of developing alternative management methods for different types of sulphide soil. In addition, there are also uncertainties concerning the legal and environmental aspects of how excavated sulphide soil should be managed in a sustainable way. Technical development with regard to the assessment of the acidification rate and how to assess the acidification state is needed for a more efficient and sustainable management of sulphide soil.Along the entire northern coast of Sweden there are areas with post-glacial sulphide sediment, which as a result of land uplift now could be found at an altitude of 0-80 m above the sea level. Below the water table the sulphides in the soil are stable, and the pore water pH above 7. When the soil is disrupted or when the water table is lowered oxygen may diffuse in the pores and start oxidizing the sulphides. The oxidation process may result in a lowering of the pH and heavy metals bound in the soil starts to leach out. The purpose with this thesis was to increase the awareness about the acidification rate and redox processes in excavated sulphide soil and how current management could be improved without harming the local environment. This project is based on a literature and laboratory study. The literature part deals with important concepts and properties regarding sulphide soil, e.g. how today’s characterization method and management of sulphide soil is carried out, as well as factors affecting the chemical behavior in aerobic- and anaerobic environments. The laboratory study includes sampling of sulphide soil material from Skurholmsfjärden, Luleå, and development of a control method for evaluating the acidity state and acidification rate of excavated sulphide soil. Below the water table the sampled soils were black colored by the presents of iron monosulphides. The results ... Bachelor Thesis Luleå Luleå Luleå Luleå University of Technology Publications (DiVA) Skurholmsfjärden ENVELOPE(22.175,22.175,65.586,65.586) |
institution |
Open Polar |
collection |
Luleå University of Technology Publications (DiVA) |
op_collection_id |
ftluleatu |
language |
Swedish |
topic |
Technology Teknik Sulfidjord redoxsprocesser försurningshastighet oxidationsprocesser |
spellingShingle |
Technology Teknik Sulfidjord redoxsprocesser försurningshastighet oxidationsprocesser Pettersson, Johannes Sulfidjord – Metod för hållbar hantering av uppschaktad sulfidjord : Redoxprocesser och försurningshastighet |
topic_facet |
Technology Teknik Sulfidjord redoxsprocesser försurningshastighet oxidationsprocesser |
description |
Earthworks in sulphide soil areas almost invariably leads to more expensive project costs. A key factor is that almost all sulphide soil is classed as potentially acidifying which has halted the progress of developing alternative management methods for different types of sulphide soil. In addition, there are also uncertainties concerning the legal and environmental aspects of how excavated sulphide soil should be managed in a sustainable way. Technical development with regard to the assessment of the acidification rate and how to assess the acidification state is needed for a more efficient and sustainable management of sulphide soil.Along the entire northern coast of Sweden there are areas with post-glacial sulphide sediment, which as a result of land uplift now could be found at an altitude of 0-80 m above the sea level. Below the water table the sulphides in the soil are stable, and the pore water pH above 7. When the soil is disrupted or when the water table is lowered oxygen may diffuse in the pores and start oxidizing the sulphides. The oxidation process may result in a lowering of the pH and heavy metals bound in the soil starts to leach out. The purpose with this thesis was to increase the awareness about the acidification rate and redox processes in excavated sulphide soil and how current management could be improved without harming the local environment. This project is based on a literature and laboratory study. The literature part deals with important concepts and properties regarding sulphide soil, e.g. how today’s characterization method and management of sulphide soil is carried out, as well as factors affecting the chemical behavior in aerobic- and anaerobic environments. The laboratory study includes sampling of sulphide soil material from Skurholmsfjärden, Luleå, and development of a control method for evaluating the acidity state and acidification rate of excavated sulphide soil. Below the water table the sampled soils were black colored by the presents of iron monosulphides. The results ... |
format |
Bachelor Thesis |
author |
Pettersson, Johannes |
author_facet |
Pettersson, Johannes |
author_sort |
Pettersson, Johannes |
title |
Sulfidjord – Metod för hållbar hantering av uppschaktad sulfidjord : Redoxprocesser och försurningshastighet |
title_short |
Sulfidjord – Metod för hållbar hantering av uppschaktad sulfidjord : Redoxprocesser och försurningshastighet |
title_full |
Sulfidjord – Metod för hållbar hantering av uppschaktad sulfidjord : Redoxprocesser och försurningshastighet |
title_fullStr |
Sulfidjord – Metod för hållbar hantering av uppschaktad sulfidjord : Redoxprocesser och försurningshastighet |
title_full_unstemmed |
Sulfidjord – Metod för hållbar hantering av uppschaktad sulfidjord : Redoxprocesser och försurningshastighet |
title_sort |
sulfidjord – metod för hållbar hantering av uppschaktad sulfidjord : redoxprocesser och försurningshastighet |
publishDate |
2016 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-43062 |
long_lat |
ENVELOPE(22.175,22.175,65.586,65.586) |
geographic |
Skurholmsfjärden |
geographic_facet |
Skurholmsfjärden |
genre |
Luleå Luleå Luleå |
genre_facet |
Luleå Luleå Luleå |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-43062 Local 0f9f6a4f-1207-4842-be82-151189153493 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766065266853150720 |