Horizontal pressure filter with washing liquid recovery, and a filter system, a method for operating and a computer program product related thereto

A horizontal pressure filter having multiple filter plates forming at least a filter chamber therebetween, the horizontal pressure filter comprising:

• a slurry feed channel for feeding slurry into a filter chamber so as to be filtered therein;
• a filtrate outlet channel for receiving filtrate from the filter chamber and conducting the filtrate to a filtrate outlet of the horizontal pressure filter;
• a washing liquid inlet channel for feeding washing liquid from a washing liquid inlet into a filter chamber so as to wash a filter cake formed in the filter chamber;
• a washing liquid discharge channel for receiving used washing liquid from the filter chamber and conducting the used washing liquid to a washing liquid discharge outlet of the horizontal pressure filter;
• a washing liquid recovery channel for receiving unused washing liquid from the washing liquid inlet channel and conducting the unused washing liquid to a washing liquid recovery outlet;
• a compressed gas inlet;
• and
• a flow controller including valves,
• wherein the filtrate outlet channel, the washing liquid inlet channel and the washing liquid recovery channel each has a first end coupled to a common flow route as one another, and a second end that is separate and distinct from one another,
• wherein the flow controller is arranged to selectively open or close a flow connection between the washing liquid inlet channel and the washing liquid recovery channel,
• wherein the flow controller is arranged to selectively open or close a flow connection between the compressed gas inlet and the washing liquid inlet channel,
• wherein a gas flow from the compressed gas inlet to the washing liquid recovery channel via the washing liquid inlet channel is induced, so as to flush unused washing liquid remaining in the washing liquid inlet channel to the washing liquid recovery outlet.