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- Title
The influence of selected parameters on coagulation efficiency modelling in the treatment of water from a Cretaceous catchment.
- Authors
Bielski, Andrzej; Zielina, Michał
- Abstract
This paper presents the results of the studies on the effects of coagulation in surface water with high pH and alkalinity values; the water was also contaminated with a micro-dispersible suspension of undissolved carbonates. Five types of coagulants were used in this study. The flocculation process was carried out at a very low mixing gradient of 8.5 s–1, corresponding to the flocculation conditions in the vertical settlers. A mathematical model was proposed describing the effects of a pollution reduction per coagulant mass unit as a function of concentration, a coagulant dose and temperature. The coagulation effects at different process conditions were very well predicted by the model. The results of the study confirmed that pre-hydrolysed coagulants worked better than regular non-hydrolysed aluminium sulphate. Particularly, poor results were observed when aluminium sulphate was used to coagulate water at low temperatures; after a temperature drop of 10°C the coagulation effects for measured parameters deteriorated by 1.05–1.71 times. For most cases a higher process efficiency was observed for higher concentrations of the pollutant at the constant coagulant dose. However, in several experiments the opposite was true and higher concentrations of pollutants resulted in lower process efficiencies at the constant coagulant dose.
- Subjects
WATER purification; COAGULATION; COAGULATION (Water purification); COAGULANTS; ALUMINUM sulfate
- Publication
Desalination & Water Treatment, 2017, Vol 99, p289
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2017.21734