Treatment of tannery effluents by a two step coagulation/flocculation process

A coagulation/flocculation method for the treatment of tannery effluents is described in which alkaline FeCl 3 is used as flocculating agent and Ca(OH) 2 as base/precipitant. Two cycles of the treatment reduced the chemical oxygen demand (COD) of the effluent by 87%, producing a colourless, odourles...

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Bibliographic Details
Published in:Water research (Oxford) 1995, Vol.29 (11), p.2605-2608
Main Authors: Garrote, J.Ignacio, Bao, Manuel, Castro, Pablo, Bao, Manuel J.
Format: Article
Language:English
Subjects:
Applied sciences
effluent
Exact sciences and technology
Freshwater
Industrial wastewaters
Pollution
tanneries and flocculation/coagulation
Wastewaters
Water treatment and pollution
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Description
Summary:A coagulation/flocculation method for the treatment of tannery effluents is described in which alkaline FeCl 3 is used as flocculating agent and Ca(OH) 2 as base/precipitant. Two cycles of the treatment reduced the chemical oxygen demand (COD) of the effluent by 87%, producing a colourless, odourless wastewater with no appreciable suspended solids. Further repetition produced no further reduction in the COD.
ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(94)00312-U