Design and function of a chamber filter press
The chamber filter press consists of inwardly recessed filter plates arranged in parallel and surrounded by filter cloths. These filter plates are pressed together with high-pressure by the use of a hydraulic cylinder. This creates cavities between the plates, so-called filter chambers, which are connected to each other via special holes. The filtered filtrate water can be discharged from the filter chamber to the outside through small filtrate discharge pipes.
Functionality of the chamber filter press
With the aid of a feed pump, the concrete slurry or the liquid or suspension to be separated is pumped into the filter press or fed into the filter chambers. The actual filtration takes place through the high inlet pressure, with the help of which the effluent is pumped into the filter press. In the process, the water penetrates the filter cloths, whereby the solids are separated on precisely this filter cloth. Gradually, a solid filter cake is formed in the filter chamber. The filter cake is further dewatered by the increasing back pressure in the chamber. The effluent or concrete slurry loses moisture. As soon as this dewatering process is completed, the filter press opens and the filter cake falls downwards out of the filter chambers. The cycle of further sludge dewatering now begins anew.
With the help of our water density standardization, the residual water density or the concrete slurry to be cleaned can be fixed to a freely selectable target density value. You can find out more on the product page for our mobile cement residual water treatment system CWAS.
Cleaning the chamber filter press
The filter cloths, which are stretched around the filter plates, should be cleaned regularly. The frequency depends on the one hand on the sludge to be dewatered and on the other hand on the frequency of machine use. Contamination on the filter cloth is caused by the separation process of concrete slurry on the filter cloth. The relatively high inlet pressure of the effluent or residual water causes fine granules such as cement or sand to become wedged in the filter cloth. Only regular and thorough washing can remove this build-up and thus extend the service life of the filter cloths.
A tedious variant of cleaning is to remove the filter cloths and then clean them in a washing drum.
AJF offers suitable cleaning agents for the daily cleaning of the filter cloths. We have also developed a special filter cloth cleaner which regenerates the filter cloths when they are removed.
More information is available here.