In the present experimental work, the degradation and detoxification of two commercially important products being widely used in the tannery industry as synthetic tannin (ST) and degreasing agent (EP) containing 0.1% of nonylphenol ethoxylate (NPE) as well as degreasing wastewater from re-tanning was investigated using Fenton (FO) and Photo-Fenton (PFC) oxidation processes. FO and PFC oxidation experiments were performed in batch reactors for 30 min at pH 3 ± 0.2 and 40-45 °C, considering the actual temperature and pH values of retanning bath effluents. For the FO experiments the effect of varying Fe2+ and H2O2 concentrations and UV-C light irradiation on oxidation measured by the parameters COD, UV254 and UV280 absorbancies was studied. Toxicity of untreated and FO, PFC-treated synthetic solutions to the freshwater cladoceran Daphnia magna was also tested. PFC provided appreciably high COD (>80%) and UV254 and UV280 (>90%) removals for ST. The toxicity could be drastically reduced in the PFC-treated ST samples. A maximum COD removal of 57% for FO and 77% for PFC was obtained for EP samples. However, the FO process resulted in 90% toxicity even after 30 min of oxidation, while the effluent of PFC exhibited 10% of immobilization to D. magna. FO carried out on degreasing wastewater allowed resulted in 72% COD removal as well as 86% and 77% of UV254 and UV280 removals, respectively. © 2010 Desalination Publications. All rights reserved.
Titolo: | Fenton oxidation treatment of tannery wastewater and tanning agents: Synthetic tannin and nonylphenol ethoxylate based degreasing agent |
Autori: | |
Data di pubblicazione: | 2010 |
Rivista: | |
Abstract: | In the present experimental work, the degradation and detoxification of two commercially important products being widely used in the tannery industry as synthetic tannin (ST) and degreasing agent (EP) containing 0.1% of nonylphenol ethoxylate (NPE) as well as degreasing wastewater from re-tanning was investigated using Fenton (FO) and Photo-Fenton (PFC) oxidation processes. FO and PFC oxidation experiments were performed in batch reactors for 30 min at pH 3 ± 0.2 and 40-45 °C, considering the actual temperature and pH values of retanning bath effluents. For the FO experiments the effect of varying Fe2+ and H2O2 concentrations and UV-C light irradiation on oxidation measured by the parameters COD, UV254 and UV280 absorbancies was studied. Toxicity of untreated and FO, PFC-treated synthetic solutions to the freshwater cladoceran Daphnia magna was also tested. PFC provided appreciably high COD (>80%) and UV254 and UV280 (>90%) removals for ST. The toxicity could be drastically reduced in the PFC-treated ST samples. A maximum COD removal of 57% for FO and 77% for PFC was obtained for EP samples. However, the FO process resulted in 90% toxicity even after 30 min of oxidation, while the effluent of PFC exhibited 10% of immobilization to D. magna. FO carried out on degreasing wastewater allowed resulted in 72% COD removal as well as 86% and 77% of UV254 and UV280 removals, respectively. © 2010 Desalination Publications. All rights reserved. |
Handle: | http://hdl.handle.net/11386/4530057 |
Appare nelle tipologie: | 1.1.1 Articolo su rivista con DOI |