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      Metal-contaminated soil remediation by means of paper mill sludges addition: chemical and ecotoxicological evaluation.

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          Abstract

          Metal pollution of soils is a great environmental problem. The major risks due to metal pollution of soil consist of leaching to groundwater and potential toxicity to plants and/or animals. The objective of this study is to evaluate by means of chemical and ecotoxicological approach the effects of paper mill sludge addition on the mobile metal fraction of polluted metal soils. The study was carried out on acidic soil derived from mining activities and thus polluted with heavy metals, and on two paper mill sludges having different chemical features. The results obtained by leaching experiments showed that the addition of a paper mill sludge, consisting mainly of carbonates, silicates and organic matter, to a heavy-metal polluted soil produces a decrease of available metal forms. The carbonate content seems to play a key role in the chemical stabilisation of metals and consequently in a decrease of toxicity of soil. The leached solutions have a non-toxic effect. The mild remediation by addition of sludge has moreover a lasting effect.

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          Author and article information

          Journal
          Environ. Pollut.
          Environmental pollution (Barking, Essex : 1987)
          Elsevier BV
          0269-7491
          0269-7491
          Aug 2005
          : 136
          : 3
          Affiliations
          [1 ] Department of Chemistry, University of Rome La Sapienza, Research Unit of the Consorzio Interuniversitario Nazionale, La Chimica per l'Ambiente (INCA), P.le A. Moro 5, 00185 Rome, Italy. nicoletta.calace@uniroma1.it
          Article
          S0269-7491(05)00036-9
          10.1016/j.envpol.2004.12.014
          15862402
          fccca5bd-1142-416a-9e15-94ea04ac561a
          History

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