Abstract
The potential of using alum for the coagulation of humic substances was evaluated by treating a colored surface water. Jar testing revealed that only one major removal domain existed with pH=5.5 being an optimum pH value. Sedimentation as well as filtration behaviour of the floes was studied between pH = 4.7 and pH = 7. For the latter experiments, sand filters of different bed lengths were used. While sedimentation worked best at pH = 6, filtration efficiency was best for pH < 5. From the point of view of floe separation by direct filtration, therefore, conducting the process at pH < 5 offers advantages. However, the kinetics of floe formation were found to depend on pH, that is, they were much slower at pH = 4 compared to pH = 6. Data from preliminary technical-scale experiments conducted with the same raw water are presented.
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Fettig, J., Ødegaard, H., Eikebrokk, B. (1988). Humic Substances Removal by Alum Coagulation — Direct Filtration at Low pH. In: Hahn, H.H., Klute, R. (eds) Pretreatment in Chemical Water and Wastewater Treatment. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-73819-7_4
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DOI: https://doi.org/10.1007/978-3-642-73819-7_4
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