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Eficiência da remoção de óleos e graxas de uma estação de tratamento de esgoto sanitário, Cascavel - Paraná

Author(s): Fábio Orsatto | Eliane Hermes | Marcio Antonio Vilas Boas

Journal: Engenharia Ambiental : Pesquisa e Tecnologia
ISSN 1678-2178

Volume: 7;
Issue: 4;
Start page: 259;
Date: 2010;
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Keywords: mineral oils | vegetal/animal oils | launching standard.

The oils and greases are organic substances of mineral, vegetal or animal origin, being the third constituent of the domestic sewer in quantitative terms. In digestors, if in great amount, they cause problems, therefore they form a dense scum layer in the surface of the same ones, harming the process of treatment of the sewer and when depositing itself in the interior of the tubings, it can provoke restrictions to the liquid flow, reduction of the speed of the draining, rise of the height of the liquid blade, solid deposition in transport for hidric saw and consequences cloggings. The objective of this experiment was to evaluate the removal efficiency of mineral and vegetal/animal oils in a sanitary sewer treatment station. The data had been gotten in a sewer treatment station in the city of Cascavel-Paraná, enter the months of January and December of 2008, totalizing 12 samples. The collection points be situated at the beginning of the station, after Ralf 1 and 2 and in the end, before the launching of the effluent one to the receiving body. All the mineral oil samples and vegetal/animal oils meet below of the maximum limits established by Resolution CONAMA 357/2005. The efficiency of removal of mineral oils in a general way was above of 70% and to vegetal/animal oils only one sample did not present efficiency above of 70%.
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