Combination of chemical coagulation, photo-Fenton oxidation and biodegradation for the treatment of vinasse from sugar cane ethanol distillery

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Carmen S. D. Rodrigues (Author) FEUP; Ana R. Neto (Author) Other; Rose M. Duda (Author) Other; Roberto A. de Oliveira (Author) Other; Rui A. R. Boaventura (Author) FEUP; Luís M. Madeira (Author) FEUP

Journal

Title: Journal of Cleaner Production

Vol. 142 No. Part 4

Pages: 3634-3644

ISSN: 0959-6526

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 18 Citations

ISI Web of Science

Scopus - 30 Citations

INSPEC

Associated Projects

LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Other information

Authenticus ID: P-00M-JC8

DOI: 10.1016/j.jclepro.2016.10.104

Abstract (EN): he post-treatment of biodigested sugarcane vinasse was envisaged in the present study following three different approaches: i) coagulation/flocculation ¿ Approach 1; ii) combination of coagulation/flocculation with photo-Fenton reaction ¿ Approach 2; iii) coagulation/flocculation followed by biological degradation and photo-Fenton reaction ¿ Approach 3. The coagulation/flocculation per se provided a slight increase in effluent's biodegradability, a decrease in toxicity and turbidity, and provided moderate removals of total organic carbon (TOC), biochemical oxygen demand (BOD5) and chemical oxygen demand (COD). The operating costs associated with chemicals consumption are low (5.7 R$/m3 ¿ 1.4 /m3). The second and third treatment approaches allowed to reach a nontoxic effluent, improved the biodegradability and led to similar high global organics removal efficiencies. The combined treatment consisting of coagulation/flocculation plus photo-Fenton oxidation (Approach 2) revealed to be a promising solution for treating this wastewater, in order to be recirculated into the high rate anaerobic reactor. Additionally, this solution provides smaller costs (84.9 R$/m3 ¿ 20.2 m3) associated with chemicals and energy consumption, which are however very high. Nonetheless, this cost can be reduced by about 40% if solar radiation is used in the photo-Fenton process.

Type (Professor's evaluation): Scientific

No. of pages: 11