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Brazilian Journal of Chemical Engineering

Print version ISSN 0104-6632On-line version ISSN 1678-4383

Abstract

PUGET, F.P.; MELO, M.V.  and  MASSARANI, G.. Wastewater treatment by flotation. Braz. J. Chem. Eng. [online]. 2000, vol.17, n.4-7, pp.407-414. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322000000400005.

This work deals with the performance analysis of a separation set-up characterized by the ejector-hydrocyclone association, applied in the treatment of a synthetic dairy wastewater effluent. The results obtained were compared with the results from a flotation column (cylindrical body of a hydrocyclone) operated both batch and continuously. As far as the experimental set-up studied in this work and the operating conditions imposed to the process, it is possible to reach a 25% decrease in the total effluent chemical oxygen demand (COD). This corresponds approximately to 60% of the COD of the material in suspension. The best results are obtained for ratios air flow rate-feed flow rate (Qair/QL) greater then 0.15 and for ratios underflow rate-overflow rate (Qu/Qo) lower than 1.0.

Keywords : flotation; ejectors; effluent treatment; dairy wastewater effluent.

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