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Oxidative Phenol Degradation Using Non‐Noble Metal Based Catalysts
Author(s) -
Garg Anurag,
Mishra Indra Mani,
Chand Shri
Publication year - 2010
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.200900143
Subject(s) - wet oxidation , phenol , catalysis , atmospheric pressure , chemistry , wastewater , degradation (telecommunications) , inorganic chemistry , chemical oxygen demand , noble metal , metal , nuclear chemistry , environmental chemistry , chemical engineering , organic chemistry , environmental engineering , environmental science , telecommunications , oceanography , computer science , engineering , geology
Phenol laden waste streams are not considered suitable for conventional biological treatment if phenol is present in amounts higher than 70 mg/L. Catalytic wet air oxidation (CWAO) is one of the potential methods for treating waste streams containing such compounds. The present work investigated the degradation of synthetic wastewater contaminated with phenol (1 g/L) using a CWAO process in the presence of homogenous (CuSO 4 ) and heterogeneous (LaCoO 3 , CuX and CuO‐ZnO/CeO 2 ) catalysts. The reaction was conducted at low temperature (90°C) and atmospheric pressure, and at moderate operating conditions ( T ⪈ 160°C and total pressure ⪇0.8 MPa). Among all the tested catalysts, CuSO 4 , LaCoO 3 and CuX were used for WAO reactions performed at atmospheric pressure conditions, whereas the performance of CuO‐ZnO/CeO 2 catalyst was tested in above atmospheric pressure studies. At atmospheric conditions, homogeneous CuSO 4 was found to be the best showing ca. 90% phenol degradation and ca. 83% chemical oxygen demand (COD) reduction after a 24 h reaction period. The above atmospheric studies with catalyst showed ca. 82% phenol reduction and 54% COD removal within 3 h reaction time. The effect of pH, catalyst concentration, pressure and temperature are also reported. Finally, the major results are summarized and the recommendations for future work are given.