Naslov
Electrochemical treatment of electroplating wastewaters

Autori
Oreščanin, Višnja ; Kollar, Robert ; Lovrenčić Mikelić, Ivanka ; Nađ, Karlo ; Medunić, Gordana

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings Zbornik radova 3rd International congress 'Engineering, Environment and Materials in Processing Industry' III Međunarodni kongres 'Inženjerstvo, Ekologija i Materijali u Procesnoj Industriji' / Gligorić, Miladin ; Došić, Aleksandar ; Kešelj, Dragana ; Vujadinović, Dragan - Zvornik : Eurografika Zvornik, 2013, 358-364

ISBN
978-99955-81-11-4

Skup
3rd International congress 'Engineering, Environment and Materials in Processing Industry' III Međunarodni kongres 'Inženjerstvo, Ekologija i Materijali u Procesnoj Industriji'

Mjesto i datum
Jahorina, Bosna i Hercegovina, 04.03.2013. - 06.03.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ozonation ; electrochemical treatment ; wastewater ; electroplating ; heavy metals ; TOC ; COD ; iron anodes ; aluminum anodes

Sažetak
A pilot plant study of the treatment of electroplating wastewaters using elctroreduction with iron electrode plates, electrocoagulation/ozonation using aluminium electrode set followed by ozonation was presented. The initial effluent was highly enriched in heavy metals and elevated levels of organic contaminants. The concentrations of Cr6+, Fe, Ni, Cu, Zn, Pb, TOC, and COD exceeded the upper permissible limits of 63, 220.2, 1.1, 7, 131.3, 1.7, 12.3 and 11.4 times, respectively. The heavy metal removal was forced either by the coagulation/flocculation using Fe2+, Fe3+, and Al3+ ions released into the treated solution by electrochemical corrosion of the sacrificial iron and aluminium electrodes, precipitation of the metal hydroxides as well as co-precipitation with iron and aluminium hydroxides. The principle mechanisms of the organic matter destruction were oxidation by ozone and the indirect oxidation with chlorine/hypochlorite formed by the anodic oxidation of chloride already present in the wastewater. Following the combined treatment, the removal efficiencies of the parameters Cr6+, Fe, Ni, Cu, Zn, Pb, TOC, and COD were 99.94%, 100.00%, 95.86%, 98.66%, 99.97%, 96.81%, 93.24%, 93.43%, and 77.78%, respectively. All the parameters in the final effluent were in agreement with regulated values.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija, Kemijsko inženjerstvo

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