Treatment of desizing wastewater from the textile industry by wet air oxidation

Article type: Research Article

Authors: Lei, Le-cheng | Sun, Yuan

Affiliations: Department of Environmental Science and Engineering, College of Chemical Engineering, Zhejiang University, Hangzhou 310027,China. E-mail: lclei@mail. hz. zj. cn

Note: [] Corresponding author

Abstract: This paper describes the application of wet air oxidation to the treatment of desizing wastewater from two textile companies. A two-liter high temperature, high pressure autoclave reactor was used in the study. The range of operating temperatures examined was between 150 and 290°C, and the partial pressure of oxygen ranged from 0. 375 to 2.25 MPa. Variations in pH, COD_Cr and TOD content were monitored during each experiment and used to assess the extent of conversion of the process. The effects of temperature, pressure and reaction time were explored extensively. More than 90 % COD_Cr reduction and 80 % TOC removal have been obtained. The results have also been demonstrated that WAO is a suitable pre-treatment methods due to improvement of the BOD_5/COD_Cr ratio of desizing wastewater. The reaction kinetics of wet air oxidation of desizing wastewater has been proved to be two steps, a fast reaction followed by a slow reaction stage.

Keywords: wet air oxidation, wastewater treatment, textile wastewater

Journal: Journal of Environmental Sciences, vol. 12, no. 3, pp. 290-295, 2000