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Title: Study of catalytic processes for biodiesel production wastewater treatment
Authors: Borralho, Teresa
Coelho, Solange
Estrelo, Andreia
Keywords: cobalt
chemical oxygen demand
Fenton process
biodiesel production wastewater
catalytic advanced oxidation process
potassium monopersulphate
Issue Date: 2019
Publisher: Polish Academy of Sciences, Institute of Environmental Engineering of the Polish Academy of Sciences
Abstract: The study of the possibility of removing organic compounds from wastewater originating from the biodiesel purifi cation stage by two catalytic processes, HSO5 - /transition metal and Fenton method has been presented. The source of the ion HSO5 - is potassium monopersulphate (2KHSO5 ∙KHSO4 ∙K2SO4) (Oxone) that may be decomposed into radicals (OH., SO4-., SO5-.) by means of transition metal as Co(II). Different concentrations were used for both compounds and the combination ([Co2+] = 1.00μM/[HSO5 -] = 5.00·10-2 M) achieved the highest COD removal (60%) and complete decomposition of the oxidant was verifi ed for contact times of 45 min. This process has some advantages comparing to the conventional Fenton method such as the absence of the costly pH adjustment and the Fe(III) hydroxide sludge which characterize this treatment process. The Fenton process showed that the combination of [H2 O2] = 2.00M/[Fe2+] = 0.70 M was the best and archived COD removal of 80%. The treatments studied in this research have achieved high COD removal, but the wastewater from the biodiesel purifi cation stage presents very high parametric values of Chemical Oxygen Demand (667,000 mgO2 /L), so the final COD concentration reached is still above the emission limit of discharge in surface water, according the Portuguese Law (Decree-Law 236/98). However, both treatments have proved to be feasible techniques for the pre-oxidation of the wastewater under study and can be considered as a suitable pre-treatment for this type of wastewaters. A rough economic analysis of both processes was, also, made.
Peer reviewed: yes
metadata.dc.identifier.doi: 10.24425/aep.2019.127981
ISSN: 2083-4772
Publisher version:
Appears in Collections:D-TCA - Artigos em revistas com peer review

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