Exploring the Opportunities for Using Gentle Remediation Options at the Lindholmen Southern Sector in Gothenburg
Publicerad
Författare
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Gentle Remediation Options (GRO) are low-cost and low-impact but sometimestime consuming methods to deal with elevated levels of soil contamination. GRO rely on
amendments, plant-, fungi-, and bacteria-based methods and form a subset of
naturebased solutions (NBS). The aim of this thesis is to explore the opportunities for using
GRO at the Lindholmen 6:9 property (a former shipyard area) that is currently sitting
idle awaiting redevelopment for another 10-20 years. The specific objectives to reach
this aim are to: i) identify potential soil contaminants at the Lindholmen 6:9 property
based on investigation of previous uses of the area; ii) identify potential GRO
strategies to deal with these soil contaminants at the Lindholmen 6:9 property;
iii) delimit an area of interest and identify GRO strategies of interest for the
stakeholder; and iv) review literature on effectiveness of relevant plant species for
these strategies of interest. A retrospective study of orthophotos of the property, a
review of previous site investigations, a consultation with the Shipyard Historical
Association, a review of the Industry list for surveying of contaminated sites,
stakeholder consultation and a literature review were used to reach the objectives. The
study results suggest phytoextraction and phyto- and rhizodegradation for the removal
of identified primary potential contaminants from soils at the delineated area of
interest of the Lindholmen 6:9 property – lead as a representative of heavy metals and
aliphatic hydrocarbons together with polycyclic aromatic hydrocarbons (PAHs) as
organic contaminants, respectively. The identified candidate species for the area of
interest are grasses such as ryegrass Lolium perenne, Sorghum Bicolor, Pennisetum
sinese, alfalfa Medicago sativa as well as tree species poplar (Populus nigra, Populus
deltoides) and willow (Salix matsudana, Salix schwerinii, Salix viminalis, Salix
smithiana, Salix purpurea). Lead can however be very difficult to phytoextract as its
bioavailability is usually low in the historically contaminated soils. An alternative
strategy aimed at reducing mobility of contaminants in soils with help of stabilising
plants (phytostabilisation) and/or immobilising soil amendments (chemical
stabilisation/immobilisation) could potentially be considered for managing of this
contaminant.. Further research is needed to assess the possibility of retaining parking
lots in the area of interest during "gentle remediation". Soil sampling and analysis is
recommended in accordance with a sampling plan developed in this study. Laboratory
or (and) pilot field experiments are necessary to test the effectiveness of the candidate
plant species for site-specific conditions before a full-scale field trial.
Beskrivning
Ämne/nyckelord
phytoremediation, gentle remediation options, nature- based solutions, contaminated soil, contaminated sites