Utilização da dupla filtração, oxidação e adsorção com carvão ativado pulverizado no tratamento de água eutrofizada / Use of two-stage filtration, oxidation, and powdered activated carbon adsorption in the treatment of eutrophic waters

AUTOR(ES)

Sérgio Carlos Bernardo Queiroz

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2010

RESUMO

One problem that frequently arises in water treatment plants is the inadequacy of the chosen treatment processes with respect to the source water quality. Several studies have shown that processes encompassing conventional water treatment have limited capability to remove compounds associated with algae and their by-products. In Brazil, a technology known as two-stage filtration has been studied and applied to the treatment of waters with high algae concentrations. The process employs two separated filters operated in sequence in the modes up and downflow. This research investigated the application of this technology, associated with chlorine oxidation and powdered activated carbon adsorption, for algae removal using water taken from UHE Lajeado, city of Palmas, TO. Also, the technology was applied for removal of potential by-products formed by reactions between chlorine and organic matter present in water. In order to carry out the research, a pilot installation was assembled. It was constituted by pre-oxidation and carbon adsorption columns, rapid-mix tank, and two-stage filtration. The gravel and sand filters operated up and downflow in sequence, with filtration rates of 120 and 180 m³/m².d, respectively. The input water had cyanobacteria concentrations higher than 105 cel/mL The observed results showed the pilot plant produced water in accordance with Brazilian standards, having turbidity levels lower than 0,5 uT. In all tests, cyanobacteria and chlorophyll removals were above 99% and the retention was achieved mostly by the gravel and sand filters. The use of powdered activated carbon caused an increase in the TOC removal. There was limited formation of by-products and those that were detected presented concentrations below international and Brazilian standards.

ASSUNTO(S)

water treatment tratamento da agua filtração : tratamento da água two-stage filtration carvao ativado powdered activated carbon adsorption adsorcao oxidation oxidacao cianobactérias cyanobacteria

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