Removal of algae from biological cultures: a challenge for electrocoagulation?

Autor(es)

Souza, Fernanda L. ^[1] ; Cotillas, Salvador ^[2] ; Saez, Cristina ^[2] ; Canizares, Pablo ^[2] ; Lanza, Marcos R. V. ^[1] ; Seco, Aurora ^[3] ; Rodrigo, Manuel A. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Castilla La Mancha, Dept Chem Engn, Fac Chem Sci & Technol, E-13071 Ciudad Real - Spain

^[3] Univ Valencia, Dept Chem Engn, Sch Engn, E-46100 Burjassot - Spain

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY; v. 91, n. 1, p. 82-87, JAN 2016.
• Citações Web of Science: 5

Resumo

BACKGROUND: In the search for novel technologies for the treatment of urban wastewater, combined anaerobic-algae membrane bioreactors have become a very interesting choice. Recovery of algae produced in these reactors has become the key point to obtain a good economic efficiency with this technology. In this work, electrocoagulation is studied as an alternative for the coarse removal of algae from a biological culture. RESULTS: Results demonstrate that the electrochemical technology is a suitable technology for this purpose allowing the removal of more than 90% of the algae without modifying significantly the pH and with an operating cost below 0.04 is an element of m(-3). The same general trends are observed for applied current charge and current density supplied when aluminum or iron are used as electrodes although aluminum was much more efficient. CONCLUSIONS: The dose of coagulant reagents required is very low, indicating that coagulant generated in the process is very efficiently used. The best results in terms of algae and turbidity removals are obtained operating at low current densities with aluminum electrodes. According to pH and z-potential values, insoluble metal hydroxide and anion M(OH)(4-) seems to be the primary coagulation species involved in the electrocoagulation process. (c) 2014 Society of Chemical Industry (AU)

• Processo FAPESP: 14/02580-7 - Tecnologias eletroquímicas verdes para o tratamento de resíduos poluídos com herbicidas
• Beneficiário: Fernanda de Lourdes Souza
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado