Title: Dissolved-air flotation associated with an anaerobic reactor, as applied to sewage treatment

Authors: M.A.P. Reali, R.G. Penetra, J.R. Campos

Addresses: Hydraulic and Sanitation Department, Sao Carlos Engineering School, University of Sao Paulo (SHS-EESC-USP), Av. Trabalhador Sao-carlense, 400, Sao Carlos – SP 13560-250, Brazil. ' Hydraulic and Sanitation Department, Sao Carlos Engineering School, University of Sao Paulo (SHS-EESC-USP), Av. Trabalhador Sao-carlense, 400, Sao Carlos – SP 13560-250, Brazil. ' Hydraulic and Sanitation Department, Sao Carlos Engineering School, University of Sao Paulo (SHS-EESC-USP), Av. Trabalhador Sao-carlense, 400, Sao Carlos – SP 13560-250, Brazil

Abstract: This paper presents the results of a study performed with a pilot sewage treatment plant consisting of an aerobic reactor followed by a flotation unit. To coagulate the anaerobic effluent, different ferric chloride dosages were applied by adopting two approaches: applying constant dosages during the essay and varying the dosages according to the anaerobic effluent turbidity. To obtain more than 95% TSS, 90% COD and 70% phosphorous removals a critical chemical ratio ranging 0.012-0.013 (in terms of Fe/Turbidity ratio) was required. When aiming higher phosphorous removal (above 95%) the required Fe/Turbidity ratio range rose to 0.016–0.018.

Keywords: dissolved-air flotation; DAF; anaerobic effluent flotation; physicochemical treatment; phosphorus removal; anaerobic reactors; sewage treatment; waste treatment; wastewater treatment; effluent coagulation; water pollution; environmental pollution.

DOI: 10.1504/IJEP.2007.014699

International Journal of Environment and Pollution, 2007 Vol.30 No.2, pp.178 - 196

Published online: 26 Jul 2007 *

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