Chemical Coagulation and Cementation for Decolorizing Distillery Slop Digester Effluent

Author : Balazuela, Noel Pradas
Major Adviser : Alcanzare, Edilberto A.
Committee Members : Abrigo, Casiano S. Jr.; Acda, Reynaldo I.
Year : 1995
Month : March
Type : Thesis
Degree: BS
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Distillery slop digester effluent was decolorized by chemical coagulation and cementation using Al₂(SO₄)₃ for coagulation and CuSO₄ for cementation after coagulation. Decolorization yield of 80.23 % was obtained for Al₂(SO₄)₃ coagulation with the best Al₂(SO₄)₃ dosage of 20 g/L. For cementation after Al₂(SO₄)₃ coagulation, color reduction of 36.78%, 53.65%, 48.37% and 56.12% for Al₂(SO₄)₃-CuSO₄ concentration ratio of 1:0.25, 1:0.66, 1:1.5, and 1:4.0, respectively, were achieved. Organic reduction by cementation resulted into coagulation by Al³⁺ formation. An excess of reagents, Al₂(SO₄)₃ and CuSO₄, may have increased the residual turbidity resulting to high color reading.

The use of polyelectrolyte with concentration of 0.3 ppm reduced the dosage of Al₂(SO₄)₃ by 4 g/L and improved the removal efficiency in both coagulation and cementation after coagulation methods by 90.71 % and 95.17 %, respectively. Sludge amount of solids formed by the chemical treatments ranges from 0.1588 g to 0.2710 g. Based on preliminary cost estimation and complexity of the process, Al₂(SO₄)₃ coagulation is preferred over cementation using CuSO₄ after Al₂(SO₄)₃ coagulation.

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