alexa Cement-Waste and Clay-Waste Derived Products from Metal Wastes: Environmental Characterization
Engineering

Engineering

Journal of Civil & Environmental Engineering

Author(s): J Viguri, A Andrs, C Ruiz, A Irabien, F Castro

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Metal hydroxide sludges from the wastewater treatment of metal finishing effluents are complex wastes, mainly inorganic, with a high content of heavy metals and anions. This makes it necessary to employ careful environmental management. In this work, two selected metal hydroxide cakes from the ‘on site’ wastewater treatment of nickel and chromium electroplating activities and the anodizing of aluminium materials were treated with Portland cement and mixed with clay, offering two possibilities of solidification/stabilization prior to landfilling, and reutilization in ceramic products, respectively. The obtained products were characterized by the determination of ecotoxicity values, EC50, of the TCLP leachates and the chemical characterization of DIN-38414-S4 leachates. The unconfined compressive strength (UCS) was determined in all derived products. Cement formulations show values of EC50 higher than 3000mg l-1 and high concentrations of chromium in the DIN 38414-S4 leachates, due to the alkaline medium resulting from the cement addition. The clay/waste products are non-hazardous based on the EC50 and the low concentrations of heavy metals in the leachates. The paper establishes environmental characterization of both kind of products, showing that there are environmental benefits of waste dosification in ceramic materials.

This article was published in Process Safety and Environmental Protection and referenced in Journal of Civil & Environmental Engineering

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