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

Autori
Ondrasek, Gabrijel ; Kranjčec, Filip ; Maurović, Nada ; Grčman, Helena ; Zupan, Marko ; Bagarić, Josip ; Shepherd, Jonti ; Tanaskovik, Vjekoslav ; Horvatinec, Jelena

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
4th International Symposium for Agriculture and Food - ISAF 2022

Mjesto i datum
Ohrid, Sjeverna Makedonija, 12.10.2022. - 14.10.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Podatak o recenziji nije dostupan

Ključne riječi
Metal contaminated soil ; Wood fly ash ; Wood bottom ash ; Chemical speciation modeling ; Metal sorption ; Metal leaching

Sažetak
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 (<1%) in all treatments. The results show that amelioration of MCS either with FA or BA type could significantly affect chemical speciation, and thus the transfer of toxic metals from a contaminated solid matrix to water and other environmental resources including crops, but further long-term studies are required.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA