Treatment of real dairy wastewater by electrolysis and photo-assisted electrolysis in presence of chlorides

Autor(es)

Pereira de Sousa, Diego Domingos ^[1] ; Pinto, Camila Ferreira ^[1] ; Tonhela, Marquele Amorim ^[1] ; Granato, Ana Claudia ^[1] ; Motheo, Artur de Jesus ^[2] ; Lima, Alexandre de Faria ^[1] ; Ferreira, Deusmaque Carneiro ^[1] ; Fernandes, David Maikel ^[1] ; de Toledo Fornazari, Ana Luiza ^[3] ; Pointer Malpass, Geoffroy Roger ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Triangulo Mineiro, Av Doutor Randolfo Borges Jr 1250, BR-38064200 Uberaba, MG - Brazil

^[2] Univ Sao Paulo, Inst Quim Sao Carlos, Av Trab Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil

^[3] Pontificia Univ Catolica Chile, Fac Quim, Dept Quim Inorgan, Ave Vicuna Mackenna, Santiago 4860 - Chile

• Tipo de documento: Artigo de Revisão
• Fonte: WATER SCIENCE AND TECHNOLOGY; v. 80, n. 5, p. 961-969, SEP 1 2019.
• Citações Web of Science: 0

Resumo

The efficiency of electrolysis (EC/Cl-2) and photo-assisted electrolysis (EC/UV/Cl-2) methods, in the presence of chloride, for the abatement of real dairy waste from a producer in the Triangulo Mineiro region of Brazil, was evaluated. A complete 2(3) factorial design was performed for the variables time, pH and current. After determining the ideal pH, a Central Compound Design (CCD) was performed, where the applied current (533.42 mA) and treatment time (60.45 minutes) were maximized. The effluent was subsequently submitted to prolonged EC/Cl-2 and EC/UV/Cl-2 treatment in order to evaluate the behaviour of specific environmental parameters over time. The EC/UV/Cl-2 method was more efficient than simple EC/Cl-2 treatment. The EC/UV/Cl-2 method resulted in a reduction of all environmental parameters investigated to levels within legal standards for effluent discharge. A relatively low cost of treatment is obtained with Energy per Order (E-EO) values of 0.89 and 1.22 kWh m(-3) order(-1) for the EC/UV/Cl-2 and EC/Cl-2 treatments, respectively. The electrochemical production of free chlorine species followed by subsequent photolysis and production of radical species can convert a simple electrochemical process into an advanced oxidation process (AOP). (AU)

• Processo FAPESP: 14/02739-6 - Reuso de água em irrigação e aquicultura: inativação de fármacos e interferentes endócrinos pelo processo foto-fenton solar
• Beneficiário: Eduardo Bessa Azevedo
• Modalidade de apoio: Auxílio à Pesquisa - Regular