Wastewater treatment of biodiesel production using persulphate ion as an oxidant.

Authors

  • Maria Teresa Borralho Polytechnic Institute of Beja, School of Agriculture, Department of Technology and Applied Sciences, http://orcid.org/0000-0002-9305-2082
  • Ana Pardal Polytechnic Institute of Beja, School of Agriculture
  • Solange Coelho Polytechnic Institute of Beja, School of Agriculture

DOI:

https://doi.org/10.29352/mill0208.02.00199

Keywords:

Potassium monopersulfate, Chemical oxidation, Chemical Oxygen Demand, Wastewater from biodiesel purification

Abstract

Introduction: The production of biodiesel produces a highly polluting effluent, because presents high values of Chemical Oxygen Demand (COD), oils and fats, among other contaminants. Sodium persulphate is a powerful oxidant (Eº = 2.1V). In addition to the direct oxidation that is favored in alkaline media, it can be induced by photolytic processes, catalytic and / or catalytic photos forming sulphate radicals (Eº = 2.6 V) thus providing reaction mechanisms with free radicals like hydroxyl radicals.

Methods: In this work the effect of the potassium monopersulphate compound (2KHSO5.KHSO4K2SO4), (Oxone) on the removal of COD in residual water from the biodiesel purification step was tested.

Results: The tests, direct oxidation at alkaline pH and catalytic oxidation with cobalt ions, Co(II), showed that the former, for Oxone concentrations of 1.00x10-2 M and 4.00x10-3 M, were not effective because no decomposition occurred, for reaction times over three hours, thus not occurring removal of COD. In the catalytic assays combinations were tested, varying between 5.00x10-3 M and 7.50x10-2 M for the oxidant and 0.10 μM and 1.00 μM for the catalyst. The complete decomposition of the oxidant was always verified between 15 min. and 2 h. The tests with the lowest concentration of cobalt showed COD removal rates around 20% and the highest one reached 60%. 

Conclusions: The most favorable assay achieves significant COD removals, but not enough for the effluent to be discharged in the hydric medium according the portuguese legislation.

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Author Biographies

Maria Teresa Borralho, Polytechnic Institute of Beja, School of Agriculture, Department of Technology and Applied Sciences,

Department of Technology and Applied Sciences

Research Center- Fiber Materials and Environment, FibEnTech

Ana Pardal, Polytechnic Institute of Beja, School of Agriculture

Department of Technology and Applied Sciences

Research Center: Fiber Materials and Environment, FibEnTech

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Published

2019-01-31

How to Cite

Borralho, M. T., Pardal, A., & Coelho, S. (2019). Wastewater treatment of biodiesel production using persulphate ion as an oxidant. Millenium - Journal of Education, Technologies, and Health, 2(8), 21–27. https://doi.org/10.29352/mill0208.02.00199

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Section

Engineering, Technology, Management and Tourism