Construction and evaluation of hydrocyclones models for wastewater treatment. / Construção e avaliação de modelos de hidrociclone para tratamento de agua residuaria.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In this work five different hydrocyclones were constructed based on geometry recommended by Rietema (1961) and Bradley (1965), for evaluation of the efficiency to separate emulsified oil from water. Its aim was to maximize the hydrocyclone efficiency as wastewater pre-depurator. Oil-in-water emulsions and solutions with particles of coal and Sacaromyces cerevisiae in water were maintained in a agitate tank to ensure the complete homogenization of the emulsions and solutions. The hydrocyclones were feed through a centrifugal pump. One of the hydrocyclones has two conical parts and one cylindrical part (CM1). In a second model a static screw with eleven threads was inserted in the cylindrical part of the hydrocyclone to increase the course of the particles in the centrifugal field (CM2). The hydrociclone (CM3) was differentiated of CM2 for the insertion of a tube in its central part. The hydrocyclone (CM4) was constructed from Bradley model hydrocyclone for the insertion of a static screw with six threads. Also it was constructed a Bradley model for ends of comparisons. Samples of the water-oil emulsion were collected at the feed, underflow and overflow to determined the oil concentration. The COD test, as recommended by Standard Methods, was used to determine the oil concentration, after the sample dilution. The overall efficiency of separation oil of the Bradley model hydrocyclone was better than the hydrocyclones CM1 and CM2, therefore the overall efficiency of separation of these hydrocyclones operating in recycle was significantly higher than without recycle, under same operating conditions. The CM2 model had overall efficiency higher than the CM1 model. No higher significant difference was found with the increase of the power pump, as well as no higher significant difference of overall efficiency was found between CM3 and Bradley model hydrocyclones. The hydrocyclones studied cannot efficiently separate Sacaromyces cerevisiae or coal powder from water with high efficiencies.

ASSUNTO(S)

tratamento de efluentes hydrocyclones oil in water emulsions saccharomyces cerevisiae wastewater treatment hidrociclone environment meio ambiente emulsão de oleo em agua

ACESSO AO ARTIGO

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