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Electrochemical treatment of wastewater from the process of surface protection of metals

Višnja Oreščanin ; Oreščanin, j.d.o.o., Zagreb, Croatia
Robert Kollar ; Napredna energija, d.o.o., Zagreb, Croatia
Karlo Nađ ; Napredna energija, d.o.o., Zagreb, Croatia

Puni tekst: engleski, pdf (332 KB) str. 111-118 preuzimanja: 71* citiraj
APA 6th Edition
Oreščanin, V., Kollar, R. i Nađ, K. (2018). Electrochemical treatment of wastewater from the process of surface protection of metals. Hrvatske vode, 26 (104), 111-118. Preuzeto s https://hrcak.srce.hr/203278
MLA 8th Edition
Oreščanin, Višnja, et al. "Electrochemical treatment of wastewater from the process of surface protection of metals." Hrvatske vode, vol. 26, br. 104, 2018, str. 111-118. https://hrcak.srce.hr/203278. Citirano 24.10.2021.
Chicago 17th Edition
Oreščanin, Višnja, Robert Kollar i Karlo Nađ. "Electrochemical treatment of wastewater from the process of surface protection of metals." Hrvatske vode 26, br. 104 (2018): 111-118. https://hrcak.srce.hr/203278
Harvard
Oreščanin, V., Kollar, R., i Nađ, K. (2018). 'Electrochemical treatment of wastewater from the process of surface protection of metals', Hrvatske vode, 26(104), str. 111-118. Preuzeto s: https://hrcak.srce.hr/203278 (Datum pristupa: 24.10.2021.)
Vancouver
Oreščanin V, Kollar R, Nađ K. Electrochemical treatment of wastewater from the process of surface protection of metals. Hrvatske vode [Internet]. 2018 [pristupljeno 24.10.2021.];26(104):111-118. Dostupno na: https://hrcak.srce.hr/203278
IEEE
V. Oreščanin, R. Kollar i K. Nađ, "Electrochemical treatment of wastewater from the process of surface protection of metals", Hrvatske vode, vol.26, br. 104, str. 111-118, 2018. [Online]. Dostupno na: https://hrcak.srce.hr/203278. [Citirano: 24.10.2021.]
Puni tekst: hrvatski, pdf (332 KB) str. 111-118 preuzimanja: 319* citiraj
APA 6th Edition
Oreščanin, V., Kollar, R. i Nađ, K. (2018). Elektrokemijska obrada otpadnih voda iz procesa površinske zaštite metala. Hrvatske vode, 26 (104), 111-118. Preuzeto s https://hrcak.srce.hr/203278
MLA 8th Edition
Oreščanin, Višnja, et al. "Elektrokemijska obrada otpadnih voda iz procesa površinske zaštite metala." Hrvatske vode, vol. 26, br. 104, 2018, str. 111-118. https://hrcak.srce.hr/203278. Citirano 24.10.2021.
Chicago 17th Edition
Oreščanin, Višnja, Robert Kollar i Karlo Nađ. "Elektrokemijska obrada otpadnih voda iz procesa površinske zaštite metala." Hrvatske vode 26, br. 104 (2018): 111-118. https://hrcak.srce.hr/203278
Harvard
Oreščanin, V., Kollar, R., i Nađ, K. (2018). 'Elektrokemijska obrada otpadnih voda iz procesa površinske zaštite metala', Hrvatske vode, 26(104), str. 111-118. Preuzeto s: https://hrcak.srce.hr/203278 (Datum pristupa: 24.10.2021.)
Vancouver
Oreščanin V, Kollar R, Nađ K. Elektrokemijska obrada otpadnih voda iz procesa površinske zaštite metala. Hrvatske vode [Internet]. 2018 [pristupljeno 24.10.2021.];26(104):111-118. Dostupno na: https://hrcak.srce.hr/203278
IEEE
V. Oreščanin, R. Kollar i K. Nađ, "Elektrokemijska obrada otpadnih voda iz procesa površinske zaštite metala", Hrvatske vode, vol.26, br. 104, str. 111-118, 2018. [Online]. Dostupno na: https://hrcak.srce.hr/203278. [Citirano: 24.10.2021.]

Sažetak
The paper investigated a possibility of implementing electrochemical methods (electroreduction, electrocoagulation, indirect anodic oxidation) by using iron and aluminium electrode sets, with or without the addition of electrolytes for treatment of wastewater generated in the process of surface protection of metals. The wastewater is characterized by high values of zinc (2029 mg dm-3) and iron (78.4 mg dm-3) as well as increased values of Cr(VI) (5.4 mg dm-3) and chemical oxygen demand (820 mg dm-3) that exceed limit values for discharge into the environment by 1014, 39, 56 and 6.6 times, respectively. In order to optimize the process, the paper investigated the impact of electrode type (iron, aluminium), contact time (5-30 minutes), electrolyte mass (0.5-1.5 g NaCl) and amperage (20-50 A) on the removal level of the stated four indicators. Of the two tested electrode types, iron electrodes proved to be significantly more efficient in the removal of all measured indicators, in particular Cr(VI) and COD. A statistically significant improvement of the results in COD removal for both electrode types was achieved by the addition of electrolytes and increased amperage from 20 to 40 A. The majority of inorganic pollution is removed in the first 5 minutes of treatment. The best results are achieved by a combination of the two electrode types, with the addition of chloride as an electrolyte. After 15 minutes of electroreduction / electrocoagulation / indirect anodic oxidation by iron electrodes, 15 minutes of electrocoagulation by aluminium electrodes and 20 minutes of coagulation / flocculation and oxidation by air, 99.79% Cr(VI), 99.97% Fe, 98.23% Ni, 99.23% Cu, 99.999% Zn, 98.00% Pb and 86.46% COD were removed. All measured indicators complied with the conditions for discharge into the environment whereas all output concentrations of heavy metals ranged from 0.009 to 0.023 mg dm-3.

Ključne riječi
aluminium electrodes; electrocoagulation; electroreduction; wastewater; surface protection of metals; iron electrodes

Hrčak ID: 203278

URI
https://hrcak.srce.hr/203278

[hrvatski]

Posjeta: 616 *