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Remediation of Metal Contaminated Soils Using Compost Enriched With Inorganic Amendments.

Gadepalle, Vishnu Priya. (2009) Remediation of Metal Contaminated Soils Using Compost Enriched With Inorganic Amendments. Doctoral thesis, University of Surrey (United Kingdom)..

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Abstract

Contaminated land is increasingly becoming an important issue worldwide. Many metal contaminants are persistent in the soil for a large number of years. Immobilisation of metals/metalloids has proven to be a challenging task and a cost-effective, non-invasive and socially acceptable technology is required for its remediation. The present study involves the in-situ immobilisation of metals/metalloids in Tamar Valley soil using compost enriched with iron oxide and/or zeolite (up to 20% w/w). The results illustrated that 15% compost 5% iron oxide (15C5IO) and 15% compost 1% iron oxide (15C1IO) were effective in reducing the leaching of Cu to < 1% compared to the control sample. For Cd, all the amended samples decreased the leaching effectively to < 1% compared to the control. However, for reducing the leaching of As, 10% compost 2% iron oxide (10C2IO) and 15% zeolite 5% compost (15Z5C) were effective. The sequential extractions results show that control sample showed the order of association of As in the soil: residual fraction (69%) > reducible fraction (11%) > organic fraction (10%) > exchangeable fraction (9%); For Cu: organic fraction (55%) > residual fraction (26%) > reducible fraction (13%) > exchangeable fraction (6%) and for Cd: organic fraction (56%) > reducible fraction (25%) > residual fraction (14%) > exchangeable fraction (6%). The results of bioavailability tests demonstrated that 15% compost 5% iron oxide (15C5IO) and 15% compost 1% iron oxide (15C1IO) were effective in reducing the take up of Cu by ryegrass to 24 mg kg-1 and 35 mg kg-1 respectively. For Cd, 5% compost 5% zeolite (5C5Z) and 5% compost 5% iron oxide (5C5IO) yielded the best result for reducing the take up to 3 mg kg-1. For As, 15% compost 5% zeolite (15C5Z) and 15% compost 5% iron oxide (15C5IO) reduced the take up to 2 mg kg-1. SEM-EDX and XRD analyses were performed on the control and amended samples. However, no new phases were detected by both the methods. It was concluded that zeolite and/or iron oxide enriched compost can be used effectively for immobilising Cu, Cd and As in the contaminated soils.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors : Gadepalle, Vishnu Priya.
Date : 2009
Additional Information : Thesis (Ph.D.)--University of Surrey (United Kingdom), 2009.
Depositing User : EPrints Services
Date Deposited : 30 Apr 2019 08:08
Last Modified : 20 Aug 2019 15:33
URI: http://epubs.surrey.ac.uk/id/eprint/851577

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