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Salisbury biochar did not affect the mobility or speciation of lead in kaolin in a short-term laboratory study

Shen, Zhengtao, McMillan, Oliver, Jin, Fei ORCID: and Al-Tabbaa, Abir 2016. Salisbury biochar did not affect the mobility or speciation of lead in kaolin in a short-term laboratory study. Journal of Hazardous Materials 316 , pp. 214-220. 10.1016/j.jhazmat.2016.05.042

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Salisbury biochar (produced from British broadleaf hardwood) with two different particle sizes (≤2 mm and ≤0.15 mm) was applied on a kaolin with three different lead (Pb2+) contamination levels (50 mg/kg, 300 mg/kg and 1000 mg/kg) at the dosage of 1% in w/w. The short-term impact of biochar on the mobility and speciation of Pb2+ in the kaolin was investigated using attenuation periods of 1, 7 and 28 days. The leachability and extractability of Pb2+ in carbonic acid leaching and EDTA extraction tests as well as the speciation of Pb2+ in soils were not significantly affected by biochar treatment during all periods. The insignificant effects of biochar on Pb2+ immobilisation were most likely attributed to the high adsorption capacity of Pb2+ on the kaolin and biochar failed to competitively adsorb Pb2+ against kaolin. The kaolin immobilised Pb2+ primarily through cation exchange, which represents the readily bioavailable fractions of Pb2+ in soils and may still pose environmental risks. This paper suggests the inefficiency of biochar treament on heavy-metal contaminated clay-rich soils. Therefore a laboratory treatablity study with respect to the soil type may be crucial when large-scale biochar applications in heavy-metal associated soil remediation are evaluated.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0304-3894
Date of Acceptance: 13 May 2016
Last Modified: 07 Nov 2022 10:45

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