Physicochemical and Chemical Purification of Tannery Wastewaters
J. Naumczyk, M. Rusiniak
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Technical University of Warsaw, Faculty of Environmental Engineering, Nowowiejska 20, 00-653 Warsaw, Poland
Pol. J. Environ. Stud. 2005;14(6):789-797
In this study the process of tannery wastewater treatment by electrocoagulation and coagulation with FeCl3 followed by advanced oxidation processes (Fenton reaction, O3/OH-, O3/H2O2, H2O2/UV) was investigated. Electrocoagulation resulted in a slightly better purification effect than coagulation. The purification effect obtained by AOPs decreased in the order: Fenton reaction 3/OH- 3/H2O2 2O2/UV. A two-step process (coagulation + H2O2/UV method) resulted in 93-94% reduction of COD. Coagulation followed by Fenton reaction in 30 min. was recognized as the best method of purification of tannery wastewaters - COD was reduced by 85-88%. The concentration of ammonium ions was decreased by 62-64% when O3/OH- method was applied.
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