Abstract: The invention relates to a filter device (1) for purifying polluted liquids, especially waster water, said device consisting of a plurality of interspaced filter elements (4) which form filter modules (3) and are rotatably arranged, in a circular or polygonal manner, in a container (2) containing the untreated liquid. Said filter modules (3) arranged in a circular or polygonal manner form a cavity (14) which is connected to the container (2) by means of a suction opening (12). A cleaning device for cleaning the filter elements (4) by means of purging air is arranged on and/or in the cavity (14). The invention also relates to a method for cleaning filter elements (4) pertaining to a filter device (1). According to said method, rotating filter elements (4) are cleaned by means of purging air during the operation of the filter device.

Abstract: Equipment (6), provided for the treatment of biosludge containing a preponderant amount of fecal matter, has a fecal material receiving station (1), for the separation of sludge and filtrate. A membrane unit for the clarification of wastewater possesses a membrane module (106) and a wash chamber (105), located below said membrane module, which wash chamber has an air inlet connection, by means of which cleaning air can be injected into the membrane module (106). The membrane module (106) is also equipped with a feed inlet for wastewater and exit connections for respectively sludge and permeate. A sieve (108, 110) is located between the said wash chamber (105) and the membrane module (106) to evenly distribute cleaning air over the entire membrane module (106) and/or at the feed fitting for wastewater, the said sieve serves for the retention of larger entrained particulate.