Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing

Abstract : The main objectives of this work are to investigate the consequences of different chemical treatments (i.e. potassium hydroxide (KOH) and hydrogen peroxide (H 2 O 2)) and the effect of biochar washing on the Pb sorption capacity. Biochars derived from sewage sludge digestate and the organic fraction of municipal solid waste digestate were separately modified with 2 M KOH or 10% H 2 O 2 followed by semi-continuous or continuous washing with ultrapure water using batch or a column reactor, respectively. The results showed that the Pb adsorption capacity could be enhanced by chemical treatment of sludge-based biochar. Indeed, for municipal solid waste biochar, the Pb maximum sorption capacity was improved from 73 mg g⁻ 1 for unmodified biochar to 90 mg g⁻ 1 and 106 mg g⁻ 1 after H 2 O 2 and KOH
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Suchanya Wongrod, Stéphane Simon, Gilles Guibaud, Piet N.L. Lens, Yoan Pechaud, et al.. Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing. Journal of Environmental Management, Elsevier, 2018, 219, pp.277-284. ⟨10.1016/j.jenvman.2018.04.108⟩. ⟨hal-02141756⟩

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