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Title

Regeneration and treatment of sulfidic spent caustic using analytic hierarchy process

Year: 1395
COI: JR_EHEM-3-4_005
Language: EnglishView: 204
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Authors

Asadollah Karimi - Ph.D. Student, Environmental Engineering Research Center, Faculty of Chemical Engineering, Sahand University of Technology,Tabriz, Iran
Esmaeil Fatehifar - Professor, Environmental Engineering Research Center, Faculty of Chemical Engineering, Sahand University of Technology,Tabriz, Iran
Reza Alizadeh - Associate Professor, Environmental Engineering Research Center, Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran
Iraj Ahadzadeh - Assiatant Professor, Faculty of Chemistry, Tabriz University, Tabriz, Iran

Abstract:

Background: Sulfur compounds must be removed from petroleum because they contribute to environmental pollution. A strong alkaline solution such as caustic soda is used to remove these compounds. This spentcaustic has high values for chemical oxygen demand (COD) concentration, pH and total sulfur. In this study, the regeneration and treatment methodology of sulfidic spent caustic was investigated by applyingthe analytic hierarchy process (AHP). Methods: The evaluation index system developed was based on group decision-improved AHP. Expert Choice software was used to simplify decision-making when choosing a practical method and prioritizingtreatment of spent caustic. Cost, environmental considerations, availability and scale-up were chosen as criteria and wet air oxidation and biological and catalytic methods were selected as alternative methods. Thetreatment and regeneration of spent caustic was carried out in a batch bubble column reactor loaded with IVKAZ catalyst and the effluent was treated in a precipitation-stirred tank reactor.Results: Evaluation indicated that cost ranked first among criteria at 40.9%. The results showed that the proposed process produced about 13% (wt) of caustic, 50 g/L of COD and 36 g/L of S2-.Conclusion: The results indicate that the catalytic method was more effective (0.45) than wet air oxidation and the biological method. This process regenerated more than 85% of initial caustic and the economy of the process improved by the recycling of the stream of caustic

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Karimi, Asadollah and Fatehifar, Esmaeil and Alizadeh, Reza and Ahadzadeh, Iraj,1395,Regeneration and treatment of sulfidic spent caustic using analytic hierarchy process,https://civilica.com/doc/630252

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Type of center: دانشگاه دولتی
Paper count: 3,984
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