Otimização do tratamento de água cinza associando soluções aquosas de moringa oleifera e sulfato de alumínio
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Data
2019-09-02
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Universidade Federal de Goiás
Resumo
Given the growing demand for water in the world, approaches and/or actions are needed in
order to reduce the consume and increase the demand, the water reuse is a viable alternative
to increase the non-potable water demand in residences. The objective of this job is optimize
the greywater treatment, from the washing machine, through the association of aluminium
sulphate and Moringa oleifera seeds solutions. For this it was performed an experiment with
the greywater from washing machine of a residence, dividing in 4 studies. It was realized the
Study 1 of characterization of the flakes formed for each studied solution, which are Moringa
oleifera extracted in aqueous calcium nitrate, aqueous calcium nitrate and aluminium
sulphate. The Study 2 consisted in the jar-test experiment for each coagulant separately.
Study 3 was later performed, which jar-test experiments for the association between
aluminum sulphate and Moringa oleifera, with the combinations made through Central
Composite Rotational Design as experimental planning. The data of this test was evaluated by
the Response Surface Methodology. Lastly, in the Study 4 was made the desirability analysis,
aiming to determine the optimal dosage for each coagulant. The parameters evaluated in the
experiment was the pH, turbidity, sludge volume generated and total dissolved solids. The
results of this study indicate that with the treatment that use the lower dosages of coagulant,
being 20 ml L -1 of Moringa oleifera extracted in calcium nitrate and 1 ml L -1 of aluminium
sulphate, is viable the greywater reuse, after the treatment, in toilet flush. It's still possible
the water reuse in activities like car wash and other uses that require direct contact with the
water, as long as added the steps of filtration, to reduce the total dissolved solids, and
chlorination. For this coagulants dosages, the turbidity removal was 96,22%, the pH varied of
7,2 to 6,8, the total dissolved solids content was elevated of 360 mg L -1 to 589 mg L -1 , the
chlorine content was reduced of 0,54 mg L -1 to 0,10 mg L -1 and the sludge volume generated
was 48,7 cm3. The association of aluminum sulphate with Moringa oleifera extracted in
aqueous calcium nitrate it is viable for coagulation treatment of greywater from washing
machine, in order to reduce the dosages of each coagulant and attend standards criteria.
Descrição
Palavras-chave
Moringa oleifera, Água cinza, Coagulante natural, Otimização, Superfícies de resposta, Greywater, Natural coagulant, Optimization, Response surfaces, Moringa oleifera
Citação
RODRIGUES, Karen Campos. Otimização do tratamento de água cinza associando soluções aquosas de moringa oleifera e sulfato de alumínio. 2019. 97 f. Dissertação (Mestrado em Modelagem e Otimização) - Universidade Federal de Goiás, Catalão, 2019.