Advanced oxidation processes applied to tannery wastewater containing Direct Black 38--elimination and degradation kinetics.
The application of advanced oxidation processes (H(2)O(2)/UV, TiO(2)/H(2)O(2)/UV and TiO(2)/UV) to treat tannery wastewater was investigated. The experiments were performed in batch and continuous UV reactors, using TiO(2) as a catalyst. The effect of the hydrogen peroxide concentration on the degradation kinetics was evaluated in the concentration range 0-1800 mg L(-1). We observed that the degradation rate increased as the hydrogen peroxide increased, but excessive H(2)O(2) concentration was detrimental because it acted as a hydroxyl radical scavenger since it can compete for the active sites of the TiO(2). In the H(2)O(2)/UV treatment, the COD removal reached around 60% in 4 h of reaction, indicating that the principal pollutants were chemically degraded as demonstrated by the results for BOD, COD, nitrate, ammonium and analysis of the absorbance at 254 nm. Artemia salina toxicity testing performed in parallel showed an increase in toxicity after AOP treatment of the tannery wastewater.
Sauer
Ticiane Pokrywiecki
TP
Department of Chemical and Food Engineering, Federal University of Santa Catarina, Campus Universitário-Trindade, 88040-900 Florianópolis, Santa Catarina, Brazil. sauer@enq.ufsc.br
Casaril
Leonardo
L
Oberziner
André Luiz Bertoldi
AL
José
Humberto Jorge
HJ
Moreira
Regina de Fátima Peralta Muniz
Rde F
D001391:Azo Compounds / Q000737:chemistry* / Q000302:isolation & purification*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D006861:Hydrogen Peroxide / Q000737:chemistry; D007700:Kinetics; D015394:Molecular Structure; D010084:Oxidation-Reduction; D012996:Solutions; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D001391:Azo Compounds; D012996:Solutions; C015844:direct black 3; D006861:Hydrogen Peroxide