Back to Search Start Over

Amelioration of metal-contaminated soil by bioash impacts metals released from the soil matrix & chemical speciation in water leachates

Authors :
Ondrasek, Gabrijel
Kranjčec, Filip
Maurović, Nada
Grčman, Helena
Zupan, Marko
Bagarić, Josip
Shepherd, Jonti
Tanaskovik, Vjekoslav
Horvatinec, Jelena
Publication Year :
2022

Abstract

Metal contaminated soils (MCS) are raising global issue which threats human and environmental health and safety. A controlled pot study was performed to investigate the effect of two different wood- derived bioash types (fly - FA and bottom – BA from cogeneration biomass plant) at 1% and 4% w/w rates on: i) release of metals from the MCS matrix (collected near a former mine and metallurgical plant in the town of Zerjav, Slovenia) and ii) their chemical speciation in the water leachate 175 days after the incubation period. The highest pH reaction (7.13), electrical conductivity (EC 27.3 dS/m), Pb (1.40 mg/L), Cd (0.96 mg/L) and Cu (0.18 mg/L) concentration in water percolates were detected in FA 4% treatment. In addition, the lowest pH reaction (6.52) followed by the highest Zn concentration (0.95 mg/L) were found in the water percolates from the Control (MCS without bioash addition) treatment. Chemical speciation modeling performed in Visual Minteq software using the NICA-Donnan approach indicated that all examined metals (Cd, Cu, Pb and Zn) were dominated in all water leachates (including the MSC control without bioash treatment) exclusively as organo- complexes, oscillating among humate and fulvate pools. The most toxic free metallic forms (of Cd and Zn) and chloro-complexes (of Cd) were present in negligible portions (

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.57a035e5b1ae..163eb2cff645897d1f52c1886e503b9a