The effect of polymeric coagulant aids and the time of their addition relative to the addition of the primary metal coagulants was investigated in a series of jar tests. Solutions of humic acid were coagulated using iron and aluminum coagulants in conjunction with various commercial polymers. Turbidity, particle size distributions, pH and absorbance of UV light at 254 nm were measured in these experiments. The morphology of flocs was characterized by their fractal dimensions as determined by light scattering as a function of angle. Settled water turbidity appears to be more sensitive to the time of polymer addition when ferric coagulants are used as the primary coagulant in comparison with alum.
Skip Nav Destination
Research Article| November 01 1992
Effect of Delaying the Addition of Polymeric Coagulant-Aid on Settled Water Turbidity
Water Sci Technol (1992) 26 (9-11): 2281–2284.
D. Brejchova, M. R. Wiesner; Effect of Delaying the Addition of Polymeric Coagulant-Aid on Settled Water Turbidity. Water Sci Technol 1 November 1992; 26 (9-11): 2281–2284. doi: https://doi.org/10.2166/wst.1992.0716
Download citation file: