Ecotoxicological evaluation of electrochemical oxidation for the treatment of sanitary landfill leachates
In this study, the efficiency of electrochemical oxidation to treat a sanitary landfill leachate was evaluated by the reduction in physico-chemical parameters and in ecotoxicity. The acute toxicity of the sanitary landfill leachates, before and after treatment, was assessed with the model organism Daphnia magna. Electrochemical oxidation treatment was effective in the removal of organic load and ammonium nitrogen and in the reduction of metal ions concentrations. Furthermore, a reduction of 2.5-fold in the acute toxicity towards D. magna after 36 h of treatment was noticed. Nevertheless, the toxicity of the treated leachate is still very high, and further treatments are necessary in order to obtain a non-toxic effluent to this aquatic organism. Toxicity results were also compared with others described in the literature for different leachate treatments and test organisms.
KeywordsSanitary landfill leachate Electrochemical oxidation Boron-doped diamond anode Daphnia magna Acute toxicity
The authors wish to thank Professor Amadeu M.V.M. Soares for providing the initial culture of D. magna.
The authors gratefully acknowledge the financial support from Fundação para a Ciência e a Tecnologia, FCT, to the projects UID/Multi/00195/2013, UID/Multi/00709/2013, SFRH/BPD/103615/2014 (A. Fernandes), SFRH/BD/109901/2015 (A.S. Rodrigues), and SFRH/BD/132436/2017 (M.J. Nunes). Additional financial support was provided by FEDER funds through the POCI-COMPETE 2020-Operational Programme Competitiveness and Internationalisation in Axis I-Strengthening research, technological development and innovation (Project POCI-01-0145-FEDER-007491), and from Santander Totta Universidades, project BID/ICI-UID FC/Santander Totta Universidades–UBI/2016 (R. Silva). A.C.A. Sousa also acknowledges the financial support of CNRS LabEx DRIIHM.
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