title: Inertisation of galvanic sludge with calcium oxide, activated carbon, and phosphoric acid.
abstract: In this study we compared three methods for the treatment of electroplating sludge highly loaded with zinc and iron: (1) calcium oxide-based solidification/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 efficiency 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.
authors.affiliation: Advanced Energy Ltd., Laboratory of Radioecology, R. Boskovic Institute, V. Prekrata 43, Zagreb, Croatia. vorescan@gmail.com
authors.forename: Višnja
authors.initials: V
authors.lastname: Oreščanin
authors.forename: Ivanka
authors.initials: I
authors.lastname: Lovrenčić Mikelić
authors.forename: Robert
authors.initials: R
authors.lastname: Kollar
authors.forename: Nenad
authors.initials: N
authors.lastname: Mikulić
authors.forename: Gordana
authors.initials: G
authors.lastname: Medunić
mesh_terms: D000327:Adsorption; D017610:Calcium Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D004595:Electroplating / Q000379:methods*; D006801:Humans; D007220:Industrial Waste / Q000032:analysis; D010087:Oxides / Q000737:chemistry*; D010756:Phosphoric Acids / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D007220:Industrial Waste; D010087:Oxides; D010756:Phosphoric Acids; D012722:Sewage; D002244:Carbon; C016538:lime; C030242:phosphoric acid