The optimal values of coagulation parameters, coagulant dosage and pH are influenced by the pretreatment process preceding coagulation and the solid-liquid separation process.
|Title||Optimisation of coagulation conditions for direct filtration of impounded surface water|
|Publication Type||Journal Article|
|Year of Publication||1995|
|Authors||Alaerts, GJ, Petrusevski, B, van Breemen, AN|
|Pagination||p. 93-102: 8 fig.|
|Keywords||algae, coagulation/flocculation, direct filtration, netherlands biesbosch, ozonation, ph, pilot plants, reservoirs, turbidity removal|
The optimal values of coagulation parameters, coagulant dosage and pH are influenced by the pretreatment process preceding coagulation and the solid-liquid separation process. The optimal coagulation conditions established for one treatment scheme usually cannot be extrapolated to a different treatment scheme. This paper discusses the optimal coagulant conditions for in-line direct filtration of Biesbosch (The Netherlands) reservoir water, characterised by a seasonally high algal load, and compares these values with the optimal conditions for conventional treatment. Both treatment systems incorporate ozonation, but a different stage in the treatment scheme. Direct filtration, in comparison to conventional treatment, can achieve comparable or higher turbidity and particle removal with 4-6 times lower coagulant dosages. An increase of coagulation pH above 7.9 resulted in distinctly improved treatment performance.The results also demonstrate that, in addition to turbidity, the particle count is an essential parameter for the determination of optimal coagulation conditions for direct filtration.
|Custom 1||253, 255.5|