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Original scientific paper

Inertisation of Galvanic Sludge with Calcium Oxide, Activated Carbon, and Phosphoric Acid

Višnja Oreščanin orcid id ; Advanced Energy Ltd., Zagreb, Croatia
Ivanka Lovrenčić Mikelić ; Laboratory of Radioecology, R. Boskovic Institute, Zagreb, Croatia
Robert Kollar ; Advanced Energy Ltd., Zagreb, Croatia
Nenad Mikulić ; EKO INVEST, Ltd., Zagreb, Croatia
Gordana Medunić ; Institute of Mineralogy and Petrography, Faculty of Science, Zagreb, Croatia

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page 337-343

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In this study we compared three methods for the treatment of electroplating sludge highly loaded with zinc and iron: (1) calcium oxide-based solidifi cation/stabilisation; (2) conversion into inert material by adsorption of organic and inorganic pollutants onto activated carbon; and (3) conversion of mobile waste components into insoluble phosphates. All three methods proved highly efficient in the conversion of hazardous waste into inert material. Under optimum treatment conditions zinc concentration in the leachate of solidified waste was reduced by 99.7 % compared to untreated sludge. Zinc retention effi ciency in the waste treated with activated carbon and phosphoric acid was 99.9 % and 98.7 %, respectively. The advantages of electroplating sludge treatment with activated carbon over the other two methods are high sorption capacity, insignificant pH and volume changes of the sludge, and simple use.


heavy metals, immobilization, leaching, solidification

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Article data in other languages: croatian

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