Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Role of plants in treating metal-polluted waters in wetlands
Stockholm University, Faculty of Science, Department of Botany.
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The overall aim of this thesis was to evaluate the role of wetland plants in wetland treatment of metal-polluted waters. The specific aims were to investigate metal uptake in various wetland plant species; whether and how wetland plants tolerate high metal concentrations in their immediate surroundings, and how the pH and metal concentrations of polluted waters influence metal uptake in wetland plants were also investigated.

Acid mine drainage with low pH (3.5) and high metal concentrations, and stormwater with a near neutral pH and lower metal concentrations were the two waters treated. The submerged plant species Elodea canadensis and Sparganium hyperboreum, the floating-leaved plant species Potamogeton natans, and the emergent plant species Carex rostrata, Eriophorum angustifolium, and Phragmites australis were exposed to concentrations of cadmium (Cd), copper (Cu), iron (Fe), lead (Pb), and zinc (Zn) naturally found in these waters.

Low pH and high metal concentrations in the polluted waters were demonstrated to have a decreased effect on the treatment efficiency. The presence of submerged and floating-leaved plant species increased the treatment efficiency of a wetland by taking up dissolved metals, while metal uptake by emergent plant species was minor.

The wetland plant species displayed only few signs of stress when exposed to Zn, Cu, and Cd. Thiol-rich peptides, increased cell wall binding, and rising pH in the medium are possible mechanisms whereby Cd is detoxified in the plant tissue.

The overall conclusion was that using wetlands to treat polluted waters is possible, although treatment efficiency is influenced by the pH and metal concentrations in the polluted water. The role of plants was dependent on the character of the waste water and on the specific plant species used. Wetland plants tolerate metal concentrations in their tissues by activating internal mechanisms that detoxify the metals.

Place, publisher, year, edition, pages
Stockholm: Botaniska institutionen , 2007. , 38 p.
Keyword [en]
treatment wetlands, stormwater, AMD, metal uptake, wetland plants
National Category
Biological Sciences
Research subject
Plant Physiology
Identifiers
URN: urn:nbn:se:su:diva-6985ISBN: 978-91-633-1164-2 (print)OAI: oai:DiVA.org:su-6985DiVA: diva2:197407
Public defence
2007-09-25, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 10:00
Opponent
Supervisors
Available from: 2007-08-06 Created: 2007-08-06Bibliographically approved
List of papers
1. Uptake of Zn, Cu, and Cd in metal loaded Elodea canadensis
Open this publication in new window or tab >>Uptake of Zn, Cu, and Cd in metal loaded Elodea canadensis
2007 (English)In: Environmental and Experimental Botany, ISSN 0098-8472, E-ISSN 1873-7307, Vol. 60, no 2, 219-226 p.Article in journal (Refereed) Published
Abstract [en]

Since uptake of metals in submerged plants can have a positive effect on the total remediation efficiency in a wetland it is important to investigate factors that possibly can have an effect on uptake of metals. In this short term study we investigated whether the tissue concentration of Zn, Cu and Cd influenced further uptake by metals in Elodea canadensis. Stress effects in response to metal exposure were also investigated. Plants were first loaded with metals for 48 h followed by a metal exposure period of 72 h. Metals in plant tissue and stress effects on plants were analysed both prior to, and after exposure. The results showed that tissue concentration of Zn and Cu did not have effect on further uptake, however for Cd it did have an effect. During Cd exposure accumulated Cd started to leak out of the plants where a decreased leakage could be seen with increased exposure concentration of Cd. The degree of metals binding to the cell wall could explain the influence of tissue concentration on uptake. These results are relevant to the phytoremediation technology area, where it is of great importance to achieve knowledge of commonly used plant species in treatment wetlands to optimise treatment of polluted areas.

Keyword
heavy metals; uptake; effective uptake; Elodea canadensis; submerged plants
National Category
Environmental Sciences Ecology
Identifiers
urn:nbn:se:su:diva-24372 (URN)000246019600010 ()
Available from: 2007-08-06 Created: 2007-08-06 Last updated: 2017-12-13Bibliographically approved
2. Response of two wetland plant species to Cd exposure at low and neutral pH
Open this publication in new window or tab >>Response of two wetland plant species to Cd exposure at low and neutral pH
2009 (English)In: Environmental and Experimental Botany, ISSN 0098-8472, E-ISSN 1873-7307, Vol. 65, no 2-3, 417-424 p.Article in journal (Refereed) Published
Abstract [en]

Emerged and submerged plants are used in treating various metal-containing wastewaters, such as stormwater (neutral pH) and acid mine drainage (low pH). The aim was to investigate the appearance of a set of possible mechanisms to detoxify Cd in plants and whether their appearance differ due to the surrounding pH and/or plant type. One emergent (Carex rostrata) and one submerged (Elodea canadensis) macrophyte were exposed to 0, 0.05, and 0.5 μM Cd for 3 d in hydroponic solutions at pH 3.5 and 6.9. We analysed cadmium accumulation, thiol-rich peptide concentrations and cell wall-bound Cd in plants, organic acid content and pH change in surrounding water cation exchange capacity (CEC) of plant tissue. Both plant species accumulated Cd in their tissues, and thus did not exclude it and C. rostrata decreased the relative Cd distribution to its shoots with increasing Cd addition. In both species, Cd was immobilized through cell wall binding, and thiol-rich peptides synthesized in the presence of Cd that may participate in Cd binding. In addition, E. canadensis increased its CEC by synthesizing new metal-binding sites in the cell walls. Organic acid composition in surrounding water did not change with Cd addition and had no effect on Cd detoxification. However, E. canadensis increased the surrounding pH from pH 3.5 in the presence of Cd; the surrounding pH did not, however, influence the detoxification mechanisms.

Keyword
Cadmium accumulation, Wetland plants, Detoxification mechanisms, Thiol-rich peptides
National Category
Biological Sciences
Identifiers
urn:nbn:se:su:diva-24373 (URN)10.1016/j.envexpbot.2008.11.011 (DOI)000263664100034 ()
Available from: 2007-08-06 Created: 2007-08-06 Last updated: 2017-12-13Bibliographically approved
3. Role of wetland plants in removal of metals from polluted waters with different pH levels and metal contents
Open this publication in new window or tab >>Role of wetland plants in removal of metals from polluted waters with different pH levels and metal contents
In: Ecological Engineering, ISSN 0925-8574Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:su:diva-24374 (URN)
Note
Part of urn:nbn:se:su:diva-6985Available from: 2007-08-06 Created: 2007-08-06Bibliographically approved
4. A field study of constructed wetlands for preventing and treating acid mine drainage
Open this publication in new window or tab >>A field study of constructed wetlands for preventing and treating acid mine drainage
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-24375 (URN)
Note
Part of urn:nbn:se:su:diva-6985Available from: 2007-08-06 Created: 2007-08-06 Last updated: 2010-01-13Bibliographically approved

Open Access in DiVA

No full text

By organisation
Department of Botany
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 353 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf