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Sequential extraction of heavy metals during composting of sewage sludge.
Chemosphere. 2005 May; 59(6):801-10.C

Abstract

The major limitation of soil application of sewage sludge compost is the total heavy metal contents and their bioavailability to the soil-plant system. This study was conducted to determine the heavy metal speciation and the influence of changing the physico-chemical properties of the medium in the course of composting on the concentrations, bioavailability or chemical forms of Cu, Zn, Pb and Ni in sewage sludge. Principal physical and chemical properties and FTIR spectroscopical characterization of sludge compost during treatment show the stability and maturity of end product. The total metal contents in the final compost were much lower than the limit values of composts to be used as good soil fertilizer. Furthermore, it was observed by using a sequential extraction procedure in sludge compost at different steps of treatment, that a large proportion of the heavy metals were associated to the residual fraction (70-80%) and more resistant fractions to extraction X-NaOH, X-EDTA, X-HNO3 (12-29%). Less than 2% of metals bound to bioavailable fractions X-(KNO3+H2O). Heavy metal distribution and bioavailability show some changes during composting depending on the metal itself and the physico-chemical properties of the medium. Bioavailable fractions of all elements tend to decrease except Ni-H2O. Zn and mainly Cu present more affinity to organic and carbonate fractions. In contrast, Pb is usually preferentially bound to sulfide forms X-HNO3. Nickel shows a significant decrease of organic form. Significant degrees of correlation were found between heavy metal fractions and changes of some selected variables (e.g. pH, ash, organic matter, humic substance) during the course of composting. Mobile fractions of metals are poorly predictable from the total content. The R2 value was significantly increased by the inclusion of other variables such as the amount of organic matter (OM) and pH.

Authors+Show Affiliations

Unité Sol et Environnement, Lab. Ecol. Végét., Faculté des Sciences Semlalia, Dépt. de Biologie. BP/2390, Marrakech, Morocco.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15811408

Citation

Amir, Soumia, et al. "Sequential Extraction of Heavy Metals During Composting of Sewage Sludge." Chemosphere, vol. 59, no. 6, 2005, pp. 801-10.
Amir S, Hafidi M, Merlina G, et al. Sequential extraction of heavy metals during composting of sewage sludge. Chemosphere. 2005;59(6):801-10.
Amir, S., Hafidi, M., Merlina, G., & Revel, J. C. (2005). Sequential extraction of heavy metals during composting of sewage sludge. Chemosphere, 59(6), 801-10.
Amir S, et al. Sequential Extraction of Heavy Metals During Composting of Sewage Sludge. Chemosphere. 2005;59(6):801-10. PubMed PMID: 15811408.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sequential extraction of heavy metals during composting of sewage sludge. AU - Amir,Soumia, AU - Hafidi,Mohamed, AU - Merlina,Georges, AU - Revel,Jean-Claude, Y1 - 2004/12/24/ PY - 2004/05/07/received PY - 2004/10/28/revised PY - 2004/11/17/accepted PY - 2005/4/7/pubmed PY - 2005/9/15/medline PY - 2005/4/7/entrez SP - 801 EP - 10 JF - Chemosphere JO - Chemosphere VL - 59 IS - 6 N2 - The major limitation of soil application of sewage sludge compost is the total heavy metal contents and their bioavailability to the soil-plant system. This study was conducted to determine the heavy metal speciation and the influence of changing the physico-chemical properties of the medium in the course of composting on the concentrations, bioavailability or chemical forms of Cu, Zn, Pb and Ni in sewage sludge. Principal physical and chemical properties and FTIR spectroscopical characterization of sludge compost during treatment show the stability and maturity of end product. The total metal contents in the final compost were much lower than the limit values of composts to be used as good soil fertilizer. Furthermore, it was observed by using a sequential extraction procedure in sludge compost at different steps of treatment, that a large proportion of the heavy metals were associated to the residual fraction (70-80%) and more resistant fractions to extraction X-NaOH, X-EDTA, X-HNO3 (12-29%). Less than 2% of metals bound to bioavailable fractions X-(KNO3+H2O). Heavy metal distribution and bioavailability show some changes during composting depending on the metal itself and the physico-chemical properties of the medium. Bioavailable fractions of all elements tend to decrease except Ni-H2O. Zn and mainly Cu present more affinity to organic and carbonate fractions. In contrast, Pb is usually preferentially bound to sulfide forms X-HNO3. Nickel shows a significant decrease of organic form. Significant degrees of correlation were found between heavy metal fractions and changes of some selected variables (e.g. pH, ash, organic matter, humic substance) during the course of composting. Mobile fractions of metals are poorly predictable from the total content. The R2 value was significantly increased by the inclusion of other variables such as the amount of organic matter (OM) and pH. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/15811408/Sequential_extraction_of_heavy_metals_during_composting_of_sewage_sludge_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(04)01065-3 DB - PRIME DP - Unbound Medicine ER -