Evaluation of the effectiveness of red mud-supported catalysts in combination with ozone and TiO2 in the treatment of solution containing benzene, toluene, and xylene

Environmental Monitoring and Assessment
Bernardo Alves de LimaFabiano Luiz Naves

Abstract

Ozone and a Fe2+/TiO2-based catalyst were examined in the degradation of a synthetic solution of benzene toluene and xylene (BTX) in an advanced oxidation process (AOP). The catalyst beads were made from the slurry waste of aluminum production process, by inserting the TiO2 content and subsequent calcination. The reduction of the BTX concentration load was monitored by the reduction of chemical oxygen demand (COD) and BTX concentration. Different levels were used on factors: pH, time of treatment, initial concentration of BTX, and percentage of TiO2. The process was conducted in a bubble column reactor with the insertion of catalyst beads. A response surface methodology technique (CCD) was used to build a model based on COD reduction results. The model was optimized using the normal-boundary intersection (NBI) algorithm to maximize COD reduction and minimize the variance attributed to the process. Optimization led to COD reductions of 80% in 2 h of experiment. Correlation analysis of coefficient models from experimental data R2adj was 0.9966, showing a good fit of model data. In the optimized conditions, the possible increase of the biodegradability ratio of the BTX solution, through the biochemical oxygen demand (BOD) and COD,...Continue Reading

References

Mar 17, 2010·Journal of Hazardous Materials·Selene Maria de Arruda Guelli Ulson de SouzaAntônio Augusto Ulson de Souza
Aug 31, 2013·The Science of the Total Environment·M J Quero-PastorJ M Quiroga
Sep 25, 2015·Environmental Science and Pollution Research International·Adriana WighSylvie Bony
May 1, 2017·Journal of Environmental Management·Raf DewilManuel A Rodrigo

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