Self cleaning filters as their name suggests, are regenerated automatically. They therefore offer the advantage of not consuming filter media. However, their minimum cut off is limited at around 30-40 µm nominal. Different systems to backwash automatically the filter media exist.
Here below are two of them :
The plate filter under pressure is a closed filtration system. Just as the self-cleaning filter it can be used with a wide range of adjuvants. However the finished product can be as
well the cake as the filtrate.
The design of this type of filter would guarantee easy maintenance at low cost. It also offers the advantage there is not consuming or any filter media.
The candle filter is a fully automated and batch filter with filter elements arranged vertically in a pressure vessel. The candle filter is a compact plan with a large production capacity, allowing a dry extraction of the cake and also multiple treatments of the cake. Discharging of the cake is effected by help of an air pump which blows air in the opposite direction individually in each plug (backpulsing)