Integration of catalytic ozonation and adsorption processes for increased efficiency of textile wastewater treatment.

Advanced and optimized textile wastewater treatment by catalytic ozonation and activated carbon (AC) adsorption was investigated. Scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy indicated that Mn and Ce oxides were successfully loaded on the γ-Al2 O3 support, and MnO2 , Mn2 O3 , CeO2 and Ce2 O3 were the main components of the catalyst. Actual textile wastewater from biochemical effluent was used as experiment wastewater. The removal efficiencies of chemical oxygen demand (COD) and chromaticity were approximately 30.6% (414 mg L-1 to 287 mg L-1 on average) and 99.3% (4,033 times to 27 times on average), respectively during the 30-day on-site continuous-flow test with an ozone dosage, contact time and gas-liquid ratio of 100 mg L-1 , 15.7 min and 2.9, respectively. Following 1 g L-1 AC adsorption, the effluent COD concentration was reduced to 40 mg L-1 . By contrast, AC adsorption without catalytic ozonation as pretreatment required 10 g L-1 AC dosage to achieve similar treatment results. Gas chromatography-mass spectrometry analyses indicated that volatile phenols, sulfides and aniline in wastewater were completely removed after treatment. Inductively-coupled plasma results further showed that the active components of MnOx -CeOx in the catalyst were stable after continuous use for 60 days. This article is protected by copyright. All rights reserved.