DE240073C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JV * 240073 CLASS \ 2d. GROUP

IN BRUNN, AUSTRIA.

and apparatus for performing this procedure.

Patented in the German Empire on September 2, 1909.

It is already known to use emulsions, sludges, sludge-containing ores and the like to suck in vacuum on filter cells, to liberate them partially from their liquid content and then push them off again from the filter cells by means of compressed air. With none of the known devices, however, find a complete drying of the filter media applied mud layer and the like

ίο instead, which former is required if it is the recycling of sewage sludge from urban sewer water and It is also a matter of producing useful and illuminating gas from this sludge.

To turn sludge-containing wastewater into a suitable dry substance for the intended purpose Using filter cells and vacuum generated in them, it is necessary to apply thin layers of sludge to be applied to the filter cells, the latter to be made small and independent of one another to be arranged, as well as on the one hand the extracted liquid uninterrupted and completely derive from the filter cells and, on the other hand, carry out the suction process for so long until fine dry cracks appear in the sludge layer, through which then Air is sucked through, which the liquid still remaining in the applied layer carries away and evaporates. This drying of the sludge layer has the further advantage that when they are subsequently thrown from the filter surfaces, the filter media is well cleaned because the compressed air has penetrated into the now dry filter media and easy to squeeze out dried sludge particles by the progressive suction process able. In contrast to known arrangements, care must be taken that the liquid sucked off is immediately and completely drained, in such a way that it with the Filter layers cannot come into contact again.

The subject matter of the invention is a method and an apparatus, the former correspondingly the foregoing is carried out, while the latter is constructed in such a way that the intended method can be carried out with the same in the best possible way.

The apparatus, which is shown in Fig. 1 of the drawing in longitudinal section and in Fig. 2 in sections according to AB, CD and EF from Fig. 1, consists of two around the hollow axis L ¹ JJ in the drawn sense (Fig. 2 ) rotating drum frames T, the cylinder surfaces of which are formed from easily exchangeable cells ζ perforated on their outward-facing wall and covered with a filter cloth.

Claims (2)

A suction chamber 5 connecting them is arranged between the drum parts, into which all of the cells ζ closed at their outer end faces open. These cells expand towards their open (inner) end and are angular, round or sickle-shaped in cross-section. For their interchangeability (see Fig. 3) the side walls of the suction chamber S are provided with openings s and the cells near their ends z ² with larger cross-sections are provided with collars z ¹ and fitted in front of the latter sealing rings d . Corresponding to the openings s, holes e provided with nut threads are drilled in the outer walls of the drum, into which set screws f are inserted. The cells are inserted with their ends z ² into the holes s and fixed by actuating the adjusting screws f acting on their closed ends, the sealing rings d sealing the cells against the suction space. The body thus formed is immersed in a container filled with sludge b. The suction space S is connected to the part L ^{1 of} the hollow axle by a pipe m which branches off vertically downwards and is open at the bottom. Two segment-shaped hollow body R are attached to the tubes m at the same level by means of its arms attached α, each of which some (advantageously four) cell openings 0 closes. For this purpose, the hollow bodies are mounted on the tube m in such a way that they cannot be displaced in the vertical direction, but that they can be rotated so far in the horizontal direction that built-in strong springs press them evenly against the end faces of the cells to be sealed cause. A suction pump is connected to part L ^{1 of} the hollow axle, while two pipes t ¹ , t ² connected to the hollow bodies R lead through the second part L ² , one of which ft ¹ ) for supplying compressed air into the hollow body and the other (t ² ) serves to introduce the required lubricating material onto the sliding surfaces between the hollow body R and the drums or the cell openings. ' Each of the two hollow bodies R has a small bore c approximately in the middle of its wall facing the drum racks, which connects its interior with the interior of this cell when the bore c with a cell opening 0 coincides. The operation of the apparatus described is as follows: Due to the vacuum created in the suction space S and the cells ζ by a pump connected to the pipeline m, L ¹ , wet sludge is deposited on the cells immersed in the sludge and, due to the strong extraction of liquid, forms within the sludge container during the rotation of the cells a rather tough layer of mud around them. . The filtered liquid entering the cells drains rapidly into the sucking space due to the gradient achieved by the cells widening towards the suction chamber and is continuously sucked off through the pipe m , so that the cells completely when they arrive at the bore c are free from liquid. As the rotation progresses, the cells covered with viscous sludge emerge one after the other from the sludge bed and continue to rotate, always releasing liquid, until they reach the hollow bodies R. While the cells cover the last part of their way, dry cracks develop in the sludge layer, through which outside air is sucked, which entrains liquid particles still present in the sludge layer. The hollow bodies R prevent further suction, and at the moment when the cell openings coincide with the hole c for the compressed air supply, compressed air enters the cell in question, which forms the thickened and dried sludge layer adhering to the filter cloth on the outside of the cell of flat cakes on a conveyor belt g that is passed by. The compressed air flow is controlled by a valve control from the outside 'or by electromagnetic Controlled controls in the hollow bodies. As the hollow bodies reach over further cell openings, there are always two already discarded cells neither with the compressed air supply nor with the suction chamber in connection, which means that if the sludge level in the sludge container fluctuates Vacuum in the suction chamber cannot be impaired. Patent-A ν Proverbs: ι. Process for thickening and drying precipitates from sludge-containing liquids, in which sludge layers are applied to filter cells by means of a vacuum and then thrown off again by compressed air after drying, characterized in that the thin layers of sludge applied to independent small filter surfaces by continuous suction and removal of the filtrate must be dried so far that outside air can be sucked through the resulting fine cracks in order to entrain and destroy the liquid still contained _{in aex K dry substance.} then steam and the former as well as sludge particles which have penetrated into the filter medium to be able to completely remove in a known manner by forced compressed air. 2. To carry out the method according to claim ι a device, characterized in that the independent, the circumference of filter drums forming filter cells (z) to expand to the inside suction chamber and the hollow body connected to a compressed air line (R) each one Number of cell openings (o) closes and connects with the compressed air line. For this purpose ι sheet of drawings.