Liquid filtration apparatus

A liquid filtration apparatus comprising:

• a series of upright filter plates forming a filter plate pack,
• wherein filtering spaces are formed in the filter plate pack,
• in at least one filtering space a filter chamber is at least partly limited laterally by a filter media,
• said at least one filtering space having an elongated bottom discharge opening at a level below the filter chamber,
• the elongated bottom discharge opening is limited by two first opposite side walls, and
• the elongated bottom discharge opening is provided with a first openable and closable hatch arrangement extending across the elongated bottom discharge opening and configured to selectively open and close the elongated bottom discharge opening at the first openable and closable hatch arrangement,
• a material feeding arrangement configured to feed material into filter chambers of the filter plate pack,
• wherein the liquid filtration apparatus comprises a pressure arrangement configured to exert pressure on material fed into said filter chamber of the filter plate pack;
• and
• a flushing fluid feeding arrangement configured to selectively feed flushing fluid into said filtering spaces of the filter plate pack, wherein
• said at least one filtering space comprises a flushing fluid drainage channel having an inlet and an outlet so that the inlet of the flushing fluid drainage channel is in the elongated bottom discharge opening of said at least one filtering space and so the outlet of the flushing fluid drainage channel is on the outside of the elongated bottom discharge opening of said at least one filtering space, wherein
• the elongated bottom discharge opening is additionally provided with a second openable and closable hatch arrangement extending across the elongated bottom discharge opening at a level below both the inlet of the flushing fluid drainage channel and the filter chamber and configured to selectively open and close the elongated bottom discharge opening at the second openable and closable hatch arrangement, wherein
• the first openable and closable hatch arrangement extends across the elongated bottom discharge opening at a level above the inlet of the flushing fluid drainage channel;
• and
• a steering arrangement configured to operate the first openable and closable hatch arrangement, the second openable and closable hatch arrangement, the material feeding arrangement, the pressure arrangement, and the flushing fluid feeding arrangement.