Treatment of vinasse from tequila production using polyglutamic acid.

Abstract:

:Vinasse, the wastewater from ethanol distillation, is characterised by high levels of organic and inorganic matter, high exit process temperature (ca. 90°C) and low pH (3.0-4.5). In this study, the treatment of tequila vinasse was achieved by a flocculation-coagulation process using poly-γ-glutamic acid (PGA). Results showed that the use of PGA (250-300 ppm) combined with sodium hypochlorite and sand filtration managed to remove about 70% of the turbidity and reduced chemical oxygen demand (COD) by 79.5% with the extra benefit of colour removal. PGA showed its best flocculating activity at pH 2.5-3.5 and a temperature of 30-55°C. Such a treatment may be a solution for small tequila companies for which other solutions to deal with their vinasse may not be economically affordable.

journal_name

J Environ Manage

authors

Carvajal-Zarrabal O,Nolasco-Hipólito C,Barradas-Dermitz DM,Hayward-Jones PM,Aguilar-Uscanga MG,Bujang K

doi

10.1016/j.jenvman.2011.05.001

subject

Has Abstract

pub_date

2012-03-01 00:00:00

pages

S66-70

eissn

0301-4797

issn

1095-8630

pii

S0301-4797(11)00136-8

journal_volume

95 Suppl

pub_type

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