Sequential extraction of heavy metals during composting of sewage sludge

被引:305
作者
Amir, S
Hafidi, M
Merlina, G
Revel, JC
机构
[1] Fac Sci Semlalia, Lab Ecol Veget, Unite Sol & Environm, Dept Biol, Marrakech, Morocco
[2] Ecole Natl Super Agr Toulouse, Equipe Agron Environm Ecotoxicol, F-31326 Castanet Tolosan, France
关键词
composting; sewage sludge; stabilization; heavy metals; bioavailability;
D O I
10.1016/j.chemosphere.2004.11.016
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 R-2 value was significantly increased by the inclusion of other variables such as the amount of organic matter (OM) and pH. (c) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:801 / 810
页数:10
相关论文
共 39 条
[1]  
*AFNOR, 1993, 31151 NF X AFNOR, P139
[2]   Elemental analysis, FTIR and 13C-NMR of humic acids from sewage sludge composting [J].
Amir, S ;
Hafidi, M ;
Merlina, G ;
Hamdi, H ;
Revel, JC .
AGRONOMIE, 2004, 24 (01) :13-18
[3]   Characterization of humic acids extracted from sewage sludge during composting and of their Sephadex® gel fractions [J].
Amir, S ;
Hafidi, M ;
Bailly, JR ;
Revel, JC .
AGRONOMIE, 2003, 23 (03) :269-275
[4]  
AMIR S, 2001, ANN CHIM-SCI MAT, V26, pS409
[5]  
AMIR S, IN PRESS P BIOCH
[6]  
Aubert G, 1978, METHODES DANALYSE SO, P360
[7]  
Bernal MP, 1996, BIOL FERT SOILS, V22, P141, DOI 10.1007/BF00384446
[8]   Determination of heavy metals in lake and river sediments by selective leaching [J].
Bodog, I ;
Polyak, K ;
Hlavay, J .
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, 1997, 66 (02) :79-94
[9]  
BREMNER J. M., 1965, Monographs of the American Society of Agronomists, V9, P1179
[10]  
CANARUTTO S, 1991, BIOCYCLE, V32, P48