NickelMaghrebV1, Main, Exploration, bibRecord, 000804

Sequential extraction of heavy metals during composting of sewage sludge

Identifieur interne : 000804 ( Main/Exploration ); précédent : 000803; suivant : 000805

Sequential extraction of heavy metals during composting of sewage sludge

Auteurs : Soumia Amir [Maroc] ; Mohamed Hafidi [Maroc] ; Georges Merlina [France] ; Jean-Claude Revel [France]

Source :

Chemosphere : (Oxford) [ 0045-6535 ] ; 2005.

RBID : Pascal:05-0270709

Descripteurs français

Pascal (Inist)
- Boue résiduaire, Traitement déchet, Traitement biologique, Compostage, Compost, Engrais, Evaluation risque, Pollution sol, Sol agricole, Métal lourd, Devenir polluant, Spéciation, Extraction séquentielle, Biodisponibilité, Distribution concentration, Stabilisation.
Wicri :
- geographic : Maroc.
- topic : Engrais, Métal lourd.

English descriptors

KwdEn :
- Agricultural soil, Bioavailability, Biological treatment, Compost, Composting, Concentration distribution, Environmental Pollution (prevention & control), Fertilizers, Heavy metal, Humic Substances (analysis), Hydrogen-Ion Concentration, Metals, Heavy (chemistry), Metals, Heavy (isolation & purification), Morocco, Pollutant behavior, Risk assessment, Sequential extraction, Sewage (analysis), Sewage (chemistry), Sewage sludge, Soil, Soil pollution, Speciation, Spectroscopy, Fourier Transform Infrared, Stabilization, Waste treatment, Water Pollutants, Chemical (isolation & purification).
MESH :
- chemical , analysis : Humic Substances, Sewage.
- chemical , chemistry : Metals, Heavy, Sewage.
- chemical , isolation & purification : Metals, Heavy, Water Pollutants, Chemical.
- geographic : Morocco, Soil.
- prevention & control : Environmental Pollution.
- Hydrogen-Ion Concentration, Spectroscopy, Fourier Transform Infrared.

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.

Affiliations:

Le document en format XML

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<author><name sortKey="Amir, Soumia" sort="Amir, Soumia" uniqKey="Amir S" first="Soumia" last="Amir">Soumia Amir</name>
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<s2>Marrakech</s2>
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<term>Bioavailability</term>
<term>Biological treatment</term>
<term>Compost</term>
<term>Composting</term>
<term>Concentration distribution</term>
<term>Environmental Pollution (prevention & control)</term>
<term>Fertilizers</term>
<term>Heavy metal</term>
<term>Humic Substances (analysis)</term>
<term>Hydrogen-Ion Concentration</term>
<term>Metals, Heavy (chemistry)</term>
<term>Metals, Heavy (isolation & purification)</term>
<term>Morocco</term>
<term>Pollutant behavior</term>
<term>Risk assessment</term>
<term>Sequential extraction</term>
<term>Sewage (analysis)</term>
<term>Sewage (chemistry)</term>
<term>Sewage sludge</term>
<term>Soil</term>
<term>Soil pollution</term>
<term>Speciation</term>
<term>Spectroscopy, Fourier Transform Infrared</term>
<term>Stabilization</term>
<term>Waste treatment</term>
<term>Water Pollutants, Chemical (isolation & purification)</term>
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<term>Compost</term>
<term>Engrais</term>
<term>Evaluation risque</term>
<term>Pollution sol</term>
<term>Sol agricole</term>
<term>Métal lourd</term>
<term>Devenir polluant</term>
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<term>Extraction séquentielle</term>
<term>Biodisponibilité</term>
<term>Distribution concentration</term>
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<front><div type="abstract" xml:lang="en">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-HNO<sub>3</sub>
 (12-29%). Less than 2% of metals bound to bioavailable fractions X-(KNO<sub>3</sub>
 + H<sub>2</sub>
O). 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-H<sub>2</sub>
O. Zn and mainly Cu present more affinity to organic and carbonate fractions. In contrast, Pb is usually preferentially bound to sulfide forms X-HNO<sub>3</sub>
. 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 R<sup>2</sup>
 value was significantly increased by the inclusion of other variables such as the amount of organic matter (OM) and pH.</div>
</front>
</TEI>
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<tree><country name="Maroc"><region name="Marrakech-Tensift-Al Haouz"><name sortKey="Amir, Soumia" sort="Amir, Soumia" uniqKey="Amir S" first="Soumia" last="Amir">Soumia Amir</name>
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<name sortKey="Hafidi, Mohamed" sort="Hafidi, Mohamed" uniqKey="Hafidi M" first="Mohamed" last="Hafidi">Mohamed Hafidi</name>
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<country name="France"><noRegion><name sortKey="Merlina, Georges" sort="Merlina, Georges" uniqKey="Merlina G" first="Georges" last="Merlina">Georges Merlina</name>
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Serveur d'exploration sur le nickel au Maghreb

Sequential extraction of heavy metals during composting of sewage sludge

Sequential extraction of heavy metals during composting of sewage sludge

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

	Serveur d'exploration sur le nickel au Maghreb
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