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

Autor: Renata Carolina Zanetti Lofrano, Carla Cristina Almeida Loures, Eduardo Prado Baston, Pedro Paulo Rocha de Castro, Luzia Lima Rezende Naves, Fabiano Luiz Naves, Gisella Rossana Lamas Samanamud, Bernardo Alves de Lima, Alexandre Boscaro França
Rok vydání: 2018
Předmět:
Zdroj: Environmental Monitoring and Assessment. 190
ISSN: 1573-2959
0167-6369
DOI: 10.1007/s10661-018-6924-8
Popis: 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, was also analyzed. Under pre-treatment conditions, the BOD/COD ratio was 0.13. After the treatment, it increased to 0.56.
Databáze: OpenAIRE
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