K.J. Ives Professor of Public Health Engineering University College London The filtration of liquids is a process which is widely used in industry. In some cases the object of the process is to clarify the liquid, as in the filtration of beer, or sugar solutions; in other cases the object is to recover solids suspended in the liquid, for example, ores in mineral processing, or the production of pigments such as titanium dioxide. In addition to the many industrial applications of liquid filtration, a considerable investment lies in municipal applications for the filtration of drinking water,...

K.J. Ives Professor of Public Health Engineering University College London The aggregation of small particles in liquids, to form flocs which are large enough to settle, or to be filtered, is a common operation in industrial processes, and water and wastewater treatment. This aggregation, given the general title flliocculation in this book, may be brought about by the addition of chemicals to reduce the stability of the original suspension, by neutralising electrical forces of repulsion, by the addition of chemicals (polymers) to link particles by bridging action, by the addition of chemicals...