Coagulation-flocculation of anaerobically treated sugarcane stillage

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorRodrigues, Isabella Junqueira
dc.creatorFuess, Lucas Tadeu
dc.creatorBiondo, Lucas
dc.creatorSantesso, Caroline Antonelli
dc.creatorGarcia, Marcelo Loureiro
dc.date2014-05-27T11:29:46Z
dc.date2016-10-25T18:50:04Z
dc.date2014-05-27T11:29:46Z
dc.date2016-10-25T18:50:04Z
dc.date2013-06-19
dc.date.accessioned2017-04-06T02:27:51Z
dc.date.available2017-04-06T02:27:51Z
dc.identifierDesalination and Water Treatment.
dc.identifier1944-3994
dc.identifier1944-3986
dc.identifierhttp://hdl.handle.net/11449/75681
dc.identifierhttp://acervodigital.unesp.br/handle/11449/75681
dc.identifier10.1080/19443994.2013.801785
dc.identifier2-s2.0-84878937070
dc.identifier0000-0002-6002-3840
dc.identifierhttp://dx.doi.org/10.1080/19443994.2013.801785
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/896419
dc.descriptionAnaerobic digestion applied to stillage usually results in treatment performances. However, effluents from anaerobic reactors still present a residual polluting load due to the presence of organic recalcitrant compounds. Additional treatment methods, such as coagulation-flocculation, may be utilized to improve the final effluent quality. In this study, we assessed the processes of coagulation and flocculation for sugarcane stillage samples previously submitted to anaerobic digestion, aiming to obtain optimal conditions for the physicochemical treatment. Natural corn starch and ferric chloride were tested as coagulants. While starch was considered as not suitable for the treatment for the tested conditions, ferric chloride assays presented satisfactory results. The investigated parameters included coagulant solution dose, rapid mixing gradient and time, flocculation gradient and time, and sedimentation time. Their adjusted values at which better performances obtained were, respectively, 1.6 g L-1, 325 rpm, 10 s, 65 rpm, 20 and 20 min. The best color, turbidity, and chemical oxygen demand removal efficiencies were 95, 97, and 65%, respectively. Stillage pH variation to alkaline conditions did not result in improved removal efficiencies. Although relatively high removal efficiencies of constituents were obtained, the final effluent characteristics did not fit regulations of water reuse in the agriculture through fertigation. However, stillage can definitely become more easily managed if better final effluent quality control parameters are achieved, enabling for example effluents discharge in water bodies. © 2013 Copyright Balaban Desalination Publications.
dc.languageeng
dc.relationDesalination and Water Treatment
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAnaerobic digestion
dc.subjectCoagulation-flocculation
dc.subjectFertigation
dc.subjectReuse
dc.subjectStillage
dc.titleCoagulation-flocculation of anaerobically treated sugarcane stillage
dc.typeOtro


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