Environmental behaviour of stabilised foundry sludge

Coz, Alberto; Andrés, A.; Soriano, Sonia; Irabien, Ángel

doi:10.1016/j.jhazmat.2004.03.002

Cited by 35 publications

(18 citation statements)

References 31 publications

(42 reference statements)

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“…However, when pH was less than 6.0, the concentration of dissolved heavy metals rapidly increased. This observation is in agreement with the results obtained by Coz et al (2004) [21] . Transformation from hydroxides precipitate to more soluble ions is the main reason for such a big increase in heavy metals concentrations.…”

Section: Acid Neutralization Capacity (Anc) Test Thesupporting

confidence: 94%

Leachability of heavy metals from solidified sludge

Bao

Dong

Feng

et al. 2009

Sci. China Ser. E-Technol. Sci.

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Solidified sludge undergoes progressive depletion of the alkalinity materials under natural weathering condition and releases out of heavy metals. The leaching of heavy metals from solidified sewage sludge was studied by acid neutralization capacity (ANC) test and flow-through leaching test. The results of ANC test showed that heavy metals release at high concentration when the pH of extract lowers than 6. The disintegration of solidified sludge and the transformation of heavy metals are the main reasons for the resolubilisation of contaminants. Flow-through leaching test indicated that leaching of heavy metals from solidified sludge occurs in a slow way. A mathematical model has been developed to predict the stabilization time of heavy metals in solidified sludge. The research results showed that decreasing hydraulic conductivity is more important than cement addition for controlling the release of heavy metals from solidified sludge.sludge, heavy metal, leaching model, stabilization time

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Section: Acid Neutralization Capacity (Anc) Test Thesupporting

confidence: 94%

Leachability of heavy metals from solidified sludge

Bao

Dong

Feng

et al. 2009

Sci. China Ser. E-Technol. Sci.

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show abstract

“…To reduce or eliminate the risks associated with these hazardous substances, spent moulds are commonly solidified and stabilized with calcium hydroxide (Coz, 2001;Coz et al, 2004) and then deposited in landfills. Growing ecological concerns and rising disposal costs have made these current practices unsustainable.…”

Section: Introductionmentioning

confidence: 99%

Technological behaviour and recycling potential of spent foundry sands in clay bricks

Alonso-Santurde

Andrés

Viguri

et al. 2011

Journal of Environmental Management

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“…The European Waste Catalogue Draft [2] considers it as hazardous using the criteria H05 (harmful) and H14 (ecotoxic). Furthermore, in previous works [3][4][5], taking into account the Spanish regulation [6], the foundry sludge was found to be ecotoxic waste due to organic compounds such as phenol and organic carbon, and inorganic compounds such as Zn and other metallic elements.…”

Section: Introductionmentioning

confidence: 99%