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Evaluating the efficiency of a vegetal coagulant in the treatment of industrial effluents
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Orientador(es)
Resumo(s)
The present work aims at evaluating the efficiency of
an organic polymer from vegetal source used as coagulant
for treating different types of industrial effluents. This coagulant
(Flox-QT) is obtained from the Black Acacia
(Acacia mearnsii). The effluents studied were produced in
petrochemical, leather, cork stoppers, metalworking, olive
oil, glue, paint (printing), textile and paper industries. The
parameters analyzed in the effluents before and after treatment
were selected according to the type of wastewater
and included pH, conductivity, apparent colour, turbidity,
total suspended solids (TSS), chemical oxygen demand
(COD) and some metals. The coagulant proved to be efficient
for almost all effluents tested. The best results were obtained
for the paper industry wastewater, with 91% removal
of chemical oxygen demand and 95% of total suspended
solids removal. The estimated cost of this treatment
would be only 0.24 Euro per cubic meter of treated
effluent, only regarding the price of the coagulant and the
required dosage. The use of this coagulant is also adequate
for the valorisation of the sludge obtained, which in
this case could be recycled for paper production.
Descrição
Palavras-chave
Coagulation/flocculation Industrial effluents Tannin Vegetal coagulant Wastewater treatment