Biodegradability enhancement of a leachate after biological lagooning using a solar driven photo-Fenton reaction, and further combination with an activated sludge biological process, at pre-industrial scale

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Tânia F. C. V. Silva (Autor) FEUP; Amélia Fonseca (Autor) Outra; Isabel Saraiva (Autor) Outra; Vítor J. P. Vilar (Autor) FEUP; Rui A. R. Boaventura (Autor) FEUP

Revista

Título: Water Research

Vol. 47 Nº 10

Páginas: 3543-3557

ISSN: 0043-1354

Editora: Elsevier

Indexação

ISI Web of Knowledge - 33 Citações

ISI Web of Science

Scopus - 35 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas

Projetos Associados

LA 20 - Projeto Estratégico-LA 20 - 2011-2012

LFOTOBIO - LFOTOBIO - Desenvoolvimento de processos combinados de oxidação fotocatalítica solar e biológica para depuração de lixiviados de aterros

Outras Informações

ID Authenticus: P-005-006

DOI: 10.1016/j.watres.2013.04.008

Abstract (EN): This work proposes an integrated leachate treatment strategy, combining a solar photo-Fenton reaction, to enhance the biodegradability of the leachate from an aerated lagoon, with an activated sludge process, under aerobic and anoxic conditions, to achieve COD target values and nitrogen content according to the legislation. The efficiency and performance of the photo-Fenton reaction, concerning a sludge removal step after acidification, defining the optimum phototreatment time to reach a biodegradable wastewater that can be further oxidized in a biological reactor and, activation sludge biological process, defining the nitrification and denitrification reaction rates, alkalinity balance and methanol dose necessary as external carbon source, was evaluated in the integrated system at a scale close to industrial. The pre-industrial plant presents a photocatalytic system with 39.52 m(2) of compound parabolic collectors (CFCs) and 2 m(3) recirculation tank and, an activated sludge biological reactor with 3 m3 capacity. Leachate biodegradability enhancement by means of a solar driven photo-Fenton process was evaluated using direct biodegradability tests, as Zahn-Wellens method, and indirect measure according to average oxidation state (AOS), low molecular carboxylic acids content (fast biodegradable character) and humic substances (recalcitrant character) concentration. Due to high variability of leachate composition, UV absorbance on-line measurement was established as a useful parameter for photo-Fenton reaction control.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15