Premium
Integration of catalytic ozonation and adsorption processes for increased efficiency of textile wastewater treatment
Author(s) -
Xu Shengkai,
Bi Huaqi,
Liu Guangqing,
Su Bensheng
Publication year - 2019
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/wer.1102
Subject(s) - chemical oxygen demand , effluent , adsorption , wastewater , chemistry , catalysis , activated carbon , nuclear chemistry , waste management , organic chemistry , engineering
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‐Al 2 O 3 support, and MnO 2 , Mn 2 O 3 , CeO 2 , and Ce 2 O 3 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% (414–287 mg/L 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, 15.7 min, and 2.9, respectively. Following 1 g/L AC adsorption, the effluent COD concentration was reduced to 40 mg/L. By contrast, AC adsorption without catalytic ozonation as pretreatment required 10 g/L 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 MnO x –CeO x in the catalyst were stable after continuous use for 60 days. Practitioner points Mesoporous catalyst synthesized by impregnating MnO x –CeO x on γ‐Al 2 O 3 support. Catalytic ozonation and AC adsorption were combined to degrade organics. Maximum degradation of COD and chromaticity by optimizing process variables. The efficiency of the method was compared to that of single AC adsorption.