Comparison of catalysis and high energy irradiation for the intensification of wet oxidation as process wastewater pretreatment

Comparison of catalysis and high energy irradiation for the intensification of wet oxidation as process wastewater pretreatment

Type	Journal Article
Author	Erika Szabados
Author	Gyuri Sági
URL	http://link.springer.com/article/10.1007/s11144-015-0894-4
Volume	116
Issue	1
Pages	95-103
Publication	Reaction Kinetics, Mechanisms and Catalysis
Date	2015/06/16
Abstract	Researchers examined the enhancing reaction rate in wet oxidation (WO) with catalysis and high energy irradiation by comparing them with the usual thermal reaction. Total organic carbon and chemical oxygen demand (COD) conversion values of phenol degradation in the thermal WO were <20% (150 °C, 20 bar, 2 h). In the catalytic reaction, they were nearly 60%. Irradiation assisted oxidation produced more than 80 % COD conversion. This increase in the oxidation rate at relatively low temperature appears to be due to temperature independent oxidation chain initiation by irradiation. Both the catalytic and especially the irradiation assisted reaction proved to be much more effective than the thermal WO. The condition of the application of Ti mesh monolith catalyst is the preparation of more leaching-resistant Ti mesh/Ru/Ir oxide catalyst with acceptable lifetime (>1000 h), that of the electron beam irradiation is the solving the problem of the introduction of the electron beam into the reaction mixture under high oxygen pressure without significant loss of intensity.