Process filters - Import export

Possibly one of the simplest filtration units used in industry today, the tipping pan filter is ideal for batch processing rapid-settling, fast-filtering crystalline suspensions. The filter is an open-topped vessel which is fitted with a false base, drainage grids and filter medium. The solid/liquid suspension is fed onto the surface of the pan and, at the same time, vacuum is applied to the base of the pan. The vacuum assists in dewatering the suspension thereby producing a filter cake on the filter medium. The filtered liquid (filtrate) is collected from the base of the pan through a special valve assembly. The filter cake can be washed in the pan as many times as is required by the process to achieve the desired product purity. Once the washing stage has completed, the pan is inverted and the filter cake is discharged.

Colloide‘s Dynamic Sand Filter offers an excellent treatment system for the removal of solids and other contaminants from a water/wastewater stream. This filter is always on line, continually filtering the incoming water while continually backwashing a small portion of the sand bed. The Dynamic Sand Filter process: The feed water is fed into the filter at the base of the active sand bed through the distribution ring. It then flows upward through the downward moving sand bed where the solids are filtered out. The clean filtrate exits the filter through the overflow weir. The continuous reject flow of washing water is discharged through a separate outlet. The dirty sand is continuously removed from the active sand bed thanks to the action of the air-lift pump. This pump draws the contaminated sand from the bottom of the filter body. A mixture of sand, dirty particles and water is transported upward through the air-lift pipe into the washing chamber at the top of the filter.