Sanitary landfill leachate treatment using combined solar photo-Fenton and biological oxidation processes at pre-industrial scale

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Tânia F. C. V. Silva (Author) FEUP; M. Elisabete F. Silva (Author) Other; A. Cristina Cunha Queda (Author) Other; Amélia Fonseca (Author) Other; Isabel Saraiva (Author) Other; Rui A. R. Boaventura (Author) FEUP; Vítor J. P. Vilar (Author) FEUP

Journal

Title: Chemical Engineering Journal

Vol. 228 No. JUL 15 2013

Pages: 850-866

ISSN: 1385-8947

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 34 Citations

ISI Web of Science

Scopus - 35 Citations

INSPEC

Scientific classification

FOS: Engineering and technology

CORDIS: Technological sciences

Associated Projects

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

Other information

Authenticus ID: P-008-BJ2

DOI: 10.1016/j.cej.2013.05.060

Abstract (EN): This work proposes a new strategy for the treatment of leachates from sanitary landfills after lagooning pretreatment, using a solar photo-Fenton oxidation process to eliminate the most recalcitrant organic compounds, leading to a biodegradability enhancement of the leachate and promoting its subsequent oxidation in an activated sludge biological reactor. The integrated leachate treatment process was conducted in a pre-industrial plant, incorporating a photocatalytic system with 39.52 m(2) of compound parabolic collectors (CPCs) and an activated sludge biological reactor, with 3.5 m(3) capacity, operated under aerated and anoxic conditions. An extensive physico-chemical characterization of the leachate after lagooning was performed during one year, from June 2010 to May 2011, showing its high recalcitrant character mainly associated with the presence of humic substances. The efficiency of the combined treatment was evaluated concerning the leachate characteristics' variability after lagooning, availability of solar radiation during the year, and different operational process variables, such as the amount of hydrogen peroxide necessary to reach the required COD target value, biodegradability enhancement during the photo-oxidation process, iron reutilization in consecutive oxidation processes, removal of acidic sludge resulting from the acidification process and leachate temperature/average solar power. The elimination of the remaining organic carbon fraction and nitrogen compounds after the pre-oxidation step was also assessed in an activated sludge biological reactor, under aerobic and anoxic conditions, considering the composition variability of photo-treated leachate. Nitrification and denitrification rates were also evaluated.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17