NDLI: Post-treatment of sanitary landfill leachate by coagulation-flocculation using chitosan as primary coagulant.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Nascimento, Inara Oliveira do Carmo Guedes, Ana Rosa Pinto Perelo, Louisa Wessels Queiroz, Luciano Matos
Description	Author Affiliation: Nascimento IO ( Department of Environmental Engineering, Federal University of Bahia, Polytechnic School, Aristides Novis Street, 2, 4th floor, Federação, Salvador, Bahia 40210-630, Brazil E-mail: nara.ocn@gmail.com.); Guedes AR ( Department of Environmental Engineering, Federal University of Bahia, Polytechnic School, Aristides Novis Street, 2, 4th floor, Federação, Salvador, Bahia 40210-630, Brazil E-mail: nara.ocn@gmail.com.); Perelo LW ( Department of Environmental Engineering, Federal University of Bahia, Polytechnic School, Aristides Novis Street, 2, 4th floor, Federação, Salvador, Bahia 40210-630, Brazil E-mail: nara.ocn@gmail.com.); Queiroz LM ( Department of Environmental Engineering, Federal University of Bahia, Polytechnic School, Aristides Novis Street, 2, 4th floor, Federação, Salvador, Bahia 40210-630, Brazil E-mail: nara.ocn@gmail.com.)
Abstract	Chitosan was chosen as an alternative primary coagulant in a complementary coagulation-flocculation treatment of sanitary landfill leachate with the aim of removing recalcitrant organic matter. In order to optimize the process conditions, central composite design and response surface methodology were applied. To evaluate the performance of the process using chitosan, we also carried out tests with aluminium sulphate (Al(2) (SO(4))(3).14 H(2)O) as coagulant. In addition, acute toxicity tests were carried using the duckweed Lemna minor and the guppy fish Poecilia reticulata as test organisms. The analytic hierarchy process was employed for selecting the most appropriate coagulant. Mean values of true colour removal efficiency of 80% and turbidity removal efficiency of 91.4% were reached at chitosan dosages of 960 mg L(-1) at pH 8.5. The acute toxicity tests showed that organisms were sensitive to all samples, mainly after coagulation-flocculation using chitosan. CE(50) for L. minor was not determined because there was no inhibition of the average growth rate and biomass production; LC(50) for P. reticulata was 23% (v v(-1)). Multi-criteria analysis showed that alum was the most appropriate coagulant. Therefore, chitosan as primary coagulant was not considered to be a viable alternative in the post-treatment of landfill leachate.
File Format	HTM / HTML
ISSN	02731223
Issue Number	1
Journal	Water Science & Technology
Volume Number	74
e-ISSN	19969732
Language	English
Publisher	IWA Publishing
Publisher Date	2016-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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