Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Coagulation-flocculation of anaerobically treated sugarcane stillage

Full text
Author(s):
Rodrigues, Isabella Junqueira [1] ; Fuess, Lucas Tadeu [2] ; Biondo, Lucas [1] ; Santesso, Caroline Antonelli [1] ; Garcia, Marcelo Loureiro [1]
Total Authors: 5
Affiliation:
[1] UNESP Univ Estadual Paulista, Dept Petr & Metallogeny, Inst Geosci & Exact Sci, BR-13506900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Hydraul & Sanitat, Lab Biol Proc, BR-13563120 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Desalination and Water Treatment; v. 52, n. 22-24, p. 4111-4121, 2014.
Web of Science Citations: 5
Abstract

Anaerobic 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. (AU)

FAPESP's process: 10/04101-8 - Assessment of the energy recovery capacity in anaerobic reactors applied to the treatment of residues with high organic concentration
Grantee:Lucas Tadeu Fuess
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 11/02183-0 - Application of the coagulation and mixing processes to the effluent of an thin stillage-treating anaerobic reactor aiming at water reuse
Grantee:Isabella Junqueira Rodrigues
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 11/05956-0 - Application of the flocculation and sedimentation unit operations to the effluent of anaerobic reactor treating thin stillage aiming at water reuse
Grantee:Lucas Biondo
Support Opportunities: Scholarships in Brazil - Scientific Initiation