Abstract
In a chemical phosphorous removal plant in Berlin, sedimentation tanks and deep filtration systems are often over-loaded as a result of a changing raw water quality and an addition of chemicals in proportion to flow rate only. A continuous flocculation test unit, consisting of two cylindrical stirrers for coagulation and flocculation, a lamella separator for floe separation and photometers for the measurement of turbidity, is described. For fluctuating raw water quality, the required residual turbidity can be obtained by means of an automatic change of coagulant and flocculation aid concentration, using a feedback control strategy. It is expected that this information can be used advantageously for a feed forward control of residual turbidity in the overflow of the full-scale sedimentation tanks. The results of preliminary full-scale experiments are presented, which show that turbidity can be successfully controlled by changing the flocculation aid concentration.
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© 1990 Springer-Verlag Berlin Heidelberg
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Zhang, J., Wiesmann, U., Grohmann, A. (1990). Process Control of a Chemical Water Treatment Plant by a Continuous Flocculation Test. In: Hahn, H.H., Klute, R. (eds) Chemical Water and Wastewater Treatment. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-76093-8_17
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DOI: https://doi.org/10.1007/978-3-642-76093-8_17
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-76095-2
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