The measurement of surface charge has long been proposed a convenient way to optimise coagulant dosage in water treatment processes. In the UK there has been a renewed interest in the use of charge measurement in the form of both zeta potential and streaming current for controlling coagulation and filtration processes. This paper review current knowledge on the factors effecting charge measurement and using data collected from a sampling survey of 12 UK water treatment works identified windows of optimum charge for sedimentation, flotation and filtration processes.

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