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Active removal of lead and zinc from polluted soil by in situ sorption to mineral nodules
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Geochemistry and Ecotechnology.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Geochemistry and Ecotechnology.
ARDHI University, Dar es Salaam, Tanzania.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Heavy metal pollution of soils is a worldwide problem. This study evaluated the capacity of autoclaved aerated concrete (AAC) and zeolite to adsorb zinc (Zn) and lead (Pb) in an artificially polluted soil. Rectangular shaped nodules of AAC and zeolite of 2 cm width, 4 cm length and 2.5 cm height were buried in plastic boxes of soil for 5 months and the soil was irrigated with distilled water every 3 days. The results showed that both AAC and zeolite had good potential for removal of heavy metals from polluted soils, although AAC showed a higher adsorption capacity for Zn than did zeolite. A large proportion of the metals was firmly bound to the soil particles and was not readily released on irrigation with water in the experimental set-up. Compared with the total metal concentration analysed, the available component accounted for 13-39% for Zn and 31-39% for Pb. This might be the reason why the adsorbent materials could only accumulate a fraction of the total metal concentrations.

Keyword [en]
Heavy metal, adsorption, pollution, speciation, soil.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-105846OAI: oai:DiVA.org:kth-105846DiVA: diva2:572507
Note

QS 2012

Available from: 2012-11-28 Created: 2012-11-28 Last updated: 2012-11-30Bibliographically approved
In thesis
1. Development of a Low Cost Remediation Method for Heavy Metal Polluted Soil
Open this publication in new window or tab >>Development of a Low Cost Remediation Method for Heavy Metal Polluted Soil
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

High concentrations of heavy metals in the soils have potential long-term environmental and health concerns because of their persistence and accumulation tendency in the environment and along the food chain. This study was aimed at studying the feasibility of heavy metals removal from the soil using plants naturally growing in the surroundings of selected polluted sites in Tanzania and soil application of the sorbent materials zeolite and autoclaved aerated concrete (AAC). The results showed that

Sporobolus sp. is a hyperaccumulator of Cu. Four other species, Launea cornuta (Oliv & Hiern) O. Jeffrey, Tagetes minuta (L.), Sporobolus sp. and Blotiella glabra (Bory) Tryon showed high potential for phytoextraction of Cu. No hyperaccumulators of Pb and Zn were identified in the area, but Tephrosia candida and Tagetes minuta (L.) were identified as potential plants for phytoextraction of Pb, while Conyza bonariensis (L.) Cronquist, Launea cornuta (Oliv & Hiern) O. Jeffrey, Tagetes minuta (L.), Blotiella glabra (Bory) Tryon, Pteridium aquilinum (L.) Kulm and Polygonum setogulum A. Rich were identified as potential plants for phytoextraction of Zn. The result from sorbent experiments showed that both materials had a potential for remediating metal polluted soils. The AAC had a higher removal capacity for both Zn and Pb than zeolite. The removal capacity of zeolite and AAC in a mixed metal experiment (Pb and Zn) showed a little difference in the sorption capacity of AAC and Zeolite for Pb and Zn respectively. Speciation of the metal in soil shows that the major part of the metal was associated with firmly attached component of the metal in the soil. Compared with the total metal concentration analysed, the available component accounted for 13-39% for Zn and 31-39% for Pb. It can be suggested to co-remediate polluted soils using reactive sorbent nodules and hyper-accumulating plant species. Identification of the best combinations and designs remains the subject of future research.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 31 p.
Series
Trita-LWR. LIC, ISSN 1650-8629 ; 2067
Keyword
autoclaved aerated concrete; decontamination; heavy metal; hyperaccumulator plants; sorbent; zeolite
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-105849 (URN)978-91-7501-591-0 (ISBN)
Presentation
2012-12-18, Sal V35, Teknikringen 76, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

QC 20121130

Available from: 2012-11-30 Created: 2012-11-28 Last updated: 2012-11-30Bibliographically approved

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