Distribution trend of trace elements in digestate exposed to air: Laboratory-scale investigations using DGT-based fractionation

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:238

Article

Laera, Andreina^1,2  Buzier, Remy²  Guibaud, Gilles²  Esposito, Giovanni³  van Hullebusch, Eric D.⁴ 

[1] Univ Paris Est, Lab Geomat & Environm EA 4508, UPEM, F-77454 Marne La Vallee, France

[2] Univ Limoges, PEIRENE, Equipe Dev Indicateurs Previs Qual Eaux, URA IRSTEA, 123 Ave Albert Thomas, F-87060 Limoges, France

[3] Univ Napoli Federico II, Dept Civil Architectural & Environm Engn, Via Claudio 21, I-80125 Naples, Italy

[4] Univ Paris Diderot, Sorbonne Paris Cite, Inst Phys Globe Paris, CNRS,UMR 7154, F-75005 Paris, France

关键词: Metals;    Metalloids;    Digested sewage sludge;    Fractionation;    Diffusive gradients in thin films (DGT);    Speciation;   

DOI  :  10.1016/j.jenvman.2019.02.120

来源: Elsevier

【 摘 要 】

The use of digestate as amendment for agricultural soils has already been proposed as an alternative to mineral fertilizers or undigested organic matter. However, little information is available concerning the effect of digestate atmospheric exposure on trace elements speciation and, consequently, on their mobility and bio-accessibility when digestate is stored in open tanks or handled before land spreading. In this study, we investigated at laboratory-scale the effect of digestate aeration on the distribution of Al, As, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Sb, Se and W using the diffusive gradients in thin films technique (DGT)-based fractionation. For this purpose, experiments were performed to assess the variation in distribution between the labile, soluble and particulate fractions over time in digested sewage sludge during passive and forced aeration. Results showed that aeration promoted a dissolution of Al, As, Co, Cr, Cu, Fe, Mn, Mo and Pb, suggesting a possible increase in their mobility that may likely occur during storage in open tanks or handling before land spreading. Labile elements' fraction increased only during forced aeration (except for Fe and Mn), suggesting that their short-term bio-accessibility can increase only after significant aeration as the one assumed to occur when land spreading takes place.

【 授权许可】

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