Field and river

20th International Conference of Ethiopian Studies (ICES20)
Mekelle University, Ethiopia

"Regional and Global Ethiopia - Interconnections and Identities"
1-5 October, 2018

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GETACHEW Dagnew, Addis Ababa University, Ethiopia

Wet air oxidation (WAO) is used to degrade organic and inorganic pollutants at high COD concentration (100-1000gCOD/l) as opposed to other advanced oxidation processes (AOPs). WAO operation variables used are mainly catalyst, temperature, and pressure, which affects stabilization time and COD removal efficiency, ranging 60-99.99%. Traditional WAO involves a temperature of 150-3000C and a pressure of 0.5-20 megapascal, whereas supercritical WAO applies a temperature >3740C and a pressure of >22 megapascal. Various studies are underway to enhance the process, such as the application of catalysts to improve performance even at lower temperature and pressure. However catalysts are being compared to one another based on activity, stability, as well as recoverability potential. Given the limits to treating recalcitrant compounds and the remaining organics, WAO is an environmentally friendly and economically feasible technology, especially if the process is catalyzed. Numerous studies have been done on WAO in recent decades, but they were conducted piecemeal, not comprehensively. This simple review paper presents the basics and current state of the art of WAO by reviewing existing papers, including the reaction mechanism, kinetics, catalysis, installed capacity, and reactor modification aspects, with illustrations.