Simultaneous removal of arsenic and toxic metals from contaminated soil : laboratory development and pilot scale demonstration

Morales Arteaga, Juan Francisco (avtor), Gluhar, Simon (avtor), Kaurin, Anela (avtor), Leštan, Domen (avtor)

Soil chemistry of toxic metalloids and metals differs, making their simultaneous removal difficult. Soil contaminated with As, Pb, Zn and Cd was washed with oxalic acid, Na-dithionite and EDTA solution. Toxic elements were removed from the washing solution by alkalinisation with CaO to a pH 12.5: As was co-precipitated with Fe from Fe-EDTA chelate formed after the soil washing. The toxic metals precipitated after substitution of their EDTA chelates with Ca. The novel method was scaled up on the ReSoil® platform. On average, 60, 76, 29, and 53% of As, Pb, Zn, and Cd were removed, no wastewater was generated and EDTA was recycled. Addition of zero-valent iron reduced the toxic elements’ leachability. Remediation was most effective for As: phytoaccessibility (CaCl$_2$ extraction), mobility (NH$_4$NO$_3$), and accessibility from human gastric and gastrointestinal phases were reduced 22, 104, 6, and 51 times, respectively. Remediation increased pH but had no effect on soil functioning assessed by fluorescein diacetate hydrolysis, dehydrogenase, β-glucosidase, urease, acid and alkaline phosphatase activities. Brassica napus produced 1.9 times more biomass on remediated soil, accumulated no As and 5.0, 2.6, and 9.0 times less Pb, Zn and Cd, respectively. We demonstrated the novel remediation technology as cost-efficient (material cost = 41.86 € t$^{−1}$) and sustainable.

• Jezik: Angleški jezik
• Ključne besede: heavy metals, soil washing, hazard mitigation, soil functioning, sustainable remediation
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: BF - Biotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: 12 str.
• Številčenje: Vol. 294, art. 118656
• PID: 20.500.12556/RUL-138851
• UDK: 502/504
• ISSN pri članku: 0269-7491
• DOI: 10.1016/j.envpol.2021.118656
• COBISS.SI-ID: 88795907
• Datum objave v RUL: 23.08.2022

Gradivo je del revije

• Naslov: Environmental pollution
• Skrajšan naslov: Environ. pollut.
• Založnik: Elsevier
• ISSN: 0269-7491
• COBISS.SI-ID: 25405184

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: toksični elementi, remediacija tal, čiščenje tal, težke kovine, pranje tal, trajnostna sanacija, sanacija tal

Projekti

• Financer: EC - European Commission
• Program financ.: H2020
• Številka projekta: 776838
• Naslov: POlluted SIte DecontaminatiON - PCP
• Akronim: POSIDON