Combined Wastewater Treatment from Manganese Phosphate Coating: Coagulation-Ozonation-Fenton Reaction-Sorption
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Department of Environmental Technology, Faculty of Chemistry, University of Gdansk, Str. Wita Stwosza 63, 80-308 Gdansk, Poland
Submission date: 2020-10-02
Final revision date: 2020-11-15
Acceptance date: 2020-11-19
Online publication date: 2021-04-01
Publication date: 2021-06-09
Corresponding author
Jakub Duszczyk   

Chemistry, University of Gdansk, Wita Stwosza, Gdańsk, Poland
Pol. J. Environ. Stud. 2021;30(4):3019–3032
Wastewater arising from manganese phosphate coating contains plenty of biogenic compounds, heavy metals such as nickel, iron, manganese, and therefore also constitutes a serious threat to the environment. The combined method of removing pollutants from wastewater from manganese phosphate coating consisting of coagulation, ozonation and Fenton reaction allowed to reduce biogenic pollutants and remove heavy metals. Coagulation was performed with iron(III) chloride and Flopam AN 934 SHU flocculant. The Fenton reaction was performed in two combinations with and without the addition of iron(III) salt. Ozonation was carried out in a column with an ozone generator, and wastewater was treated in the following sequence: coagulation-ozonation-Fenton reaction. The results of experiments demonstrated that the use of combined methods of coagulation, ozonation and Fenton reaction have brought the expected outturns. As a result of using the Fenton reaction, the content of nitrates(V) was lowered from 13.0 mg/l to 0.012 mg/l. Physico-chemical analyses of wastewater were performed using UV-VIS molecular spectrophotometry.