DE1517648A1 - Process for recovery from bilge water or the like. and Entoeler with filter foams to carry out the process - Google Patents

Description

Process for oil recovery from bilge water or the like, as well as de-oilers with filter foams to carry out the process.

The invention relates to a method for oil recovery from bilge waters, Industrial wastewater, such as cooling water in rolling mills, or the like., A de-oiler, and the Use of polyester foam filters to carry out the process.

The known continuous process for oil recovery from oil-containing Soaking by means of oil-adsorbing synthetic foams in those used for separation Containers, after which the bonded by the polyester foam Ö1 by heating and equilateral Suction is recovered are costly because of the heating of the filter Energy is needed. In addition, the degree of de-oiling is low, since that united Water still contains 20 mg per liter.

To avoid these disadvantages and to achieve a tasteless De-oiling is proposed according to the invention, the bl-water mixture under low Feed pressure in the upward direction to a pre-separator, its open-pore, cell wallless Coarse filter brings about an approximately 80% enrichment of oil droplets, which are caused by the Water flow promoted upwards, due to their lower density in one bldom collect, while the residual mixture to a second, arranged around a sieve cylinder open-pore, cell wall-less fine filter for the purpose of further de-oiling flows to it directed downwards via a drain pipe, in a fine filter of the same type and 19 384 F / U finally in an open-pored. Cell wall filter cartridge completely de-oiled. @u, the oil extracted from the water via a to the öldom protruding pipe rises.

Open-pored polyester foam filters are used to carry out this process used that are free of membranes, or egg which delimiting the pores, only partially open cell walls are missing. The individual pores of these foams Polyurethane only form a skeleton, delimiting hexagonal cavities like columns, or a deeply graded network and are suitable, like corresponding experiments have shown, excellent for enriching the oil droplets dispersed in the water, in contrast to the open-pored cell-walled filters, which retain the oil in the pores, which can only be recovered with energy and labor.

They differ in the number of pores per unit of length According to the invention, foams are useful in terms of their filtering capacity, but the individual filters arranged one behind the other in such a way that; f a coarse filter a fine filter and so it is used on a fine filter. The last filter is an austausenopare Filter cartridge provided to take up the remaining oil. With this Almost complete oil recovery is achieved. The purified water rXr still contains traces of oil of around 1 mg per liter.

The device for de-oiling bilge waters, industrial wastewater and the like., Consists of a superposed two-chamber system, in which A cylindrical filter housing is arranged laterally in the upper chamber, with a central one filter-carrying sieve cylinder is connected downstream, through which a central drain pipe leads into the lower chamber, where a cylindrical, closed post-filter housing is provided in which a filter cartridge connected to the water outlet is concentric is used. The closed post-filter housing of the lower chamber stands over Ascending pipe coming through the drain pipe of the upper chamber with in connection with the bldom. This configuration ensures that the under low pressure entering oil-water mixture is driven upwards, so that the oil droplets agglomerated in the pre-filter chamber more easily and quickly in the Can collect oil dome, then the remaining mixture down to the remaining oil removal is pressed, the residual oil through the protruding from the lower chamber into the dome Central pipe rises.

In the drawing, the invention is explained using an exemplary embodiment. It shows: FIG. 1 the oil separator in cross section, FIG. 2 a section according to II-II of Fig. 1.

In a housing that consists of two cylindrical chambers, one above the other exists, there is a cylindrical pre-separator 2 in the upper chamber, in which an open-pore, cell wall-free foam coarse filter made of polyurethane is used is. A screen cylinder 6 is provided concentrically to the upper chamber, around which an open-pore, Membrane-free foam fine filter 4 is arranged. In the middle of the screen cylinder 6 the upper chamber is released through the overflow pipe 7 to the lower chamber, in the concentric a fine filter 8 made of open-pored, membrane-free foam, in the form of a counter the upper chamber closed cylinder is used. The end cover 9 is provided with a central riser lo that in the dome 3 for the recovered Oil flows in. There is also a filter cartridge in the middle of the lower chamber 11, which consists of open-cell foam, the pores of which have permeable cell walls are provided. The drain pipe 12 for the clear water is attached to the filter cartridge 11 connected.

The cartridge 11 located in the ultra-fine filter can also be used outside of the oil separator come to the lineup.

The oil-water mixture is pumped over a dirt filter promoted by the pre-separator 2. In the capillaries of this open-pored, membrane-less With the coarse filter, 80% of the water is separated from the water. The finely distributed in the water Oil droplets are combined to form larger droplets within the capillaries and promoted by the flow of water up to the surface of the foam.

Due to the concentrated enrichment of the oil on the surface of the foam, it comes off in the form of large drops and collects in the ldom 3 of the upper chamber.

The residual liquid with finely distributed oil droplets only flows across through the foam cylinder 4. This foam is in contrast to the Oil separator 2 has fine pores, i.e. the number of pores per unit length is much larger.

In the capillaries of this foam, which is attached to the screen cylinder 6 is attached, there is a further separation of the oil from the water. The water will steered on the outer wall of the drain pipe 7 upwards. The ones emerging from the foam Ultra-highs swim upwards, collect in the oldom 3a of the chamber. At the top At the end of the tube 7, the water is deflected and flows into the lower chamber. In this it must also through a foam cylinder 8, which in contrast to that of the Cylinder 4 of the upper chamber is finely pored, flow through it transversely. Here is the remaining salary of the oil excreted almost completely. The emerging oil droplets also swim in the upward flow of the water, collect in the final basin 9 of the fine filter 8 and flow through the pipe 10 into the bldom 3a of the upper chamber away. The water is deflected upwards on the outer wall of the foam cartridge 11 and flows through it from top to bottom, with the last remaining oil residues being held back will. The de-oiled water flows through line 12 to the outside. In the foam cartridge 11 is the residual Cl content, which, based on experience, is 1-2 mg per liter at this point Liquid is adsorbed. The enriched cartridge can easily be replaced will.

If the cartridge is located outside the chamber, the water flows through the filter 8 in an upwardly directed tube from top to bottom through the Line 12 in a distributor head, which is attached to the water-carrying line in the pivot point is stored and sealed. The foam cartridge is secured by means of a bayonet lock between foot and head (not shown) attached and sealed. The water flows through the foam cartridge from top to bottom into the foot and from there through a line drains the oil into the open air.

Patent claims:

Claims (6)

Claims: ============= 1. Method for oil recovery aux Formation water from watercraft, industrial wastewater, such as cooling water from rolling mills and the like., characterized in that the bl-water mixture under pressure in the upward gear is fed to a pre-separator, whose open-pored, cell wall-less coarse grid an approx. 80% enrichment of blood droplets brings about> that by the water current promoted for separation, collect in an oldom due to lower density, while the remainder of the mixture is in a second, open-pore arranged around a sieve cylinder Cell wall-less fine filter for the purpose of further de-oiling flows to it, via a Drain pipe directed downwards in a fine filter and finally, in an open-pored one Cell wall filter cartridge to be completely de-oiled, with the removed from the water bl rises over a pipe protruding into the Oldom. 2. Use of open-pored, cell-wall-free polyester foam filters based on polyurethane for carrying out the method according to claim 1. 3. The method according to claim 1 and 2, characterized in that one Arrangement, open-pored, cell wall-free filter serving for oil separation, rising Number of pores per unit of length an open-pored cell-walled polyester foam filter is connected downstream to hold back the oil residue. 4. De-oiler for performing the method according to claims 1-3, characterized characterized in that a two-chamber system arranged one above the other, in one of which Uldom having upper chamber laterally a cylindrical prefilter housing is provided is to which a central, a filter-carrying screen cylinder downstream through which a central drain pipe leads into the lower chamber, in which a cylindrical, closed post-filter housing is arranged, in which one with the water drain connected filter cartridge is inserted concentrically. 5. Deoiler according to claim 4, characterized in that the closed Post-filter housing of the lower chamber via a passing through the outlet pipe of the upper chamber Riser pipe is connected to the oldom. 6. Deoiler according to claim 4 and 5, characterized in that the Filter cartridge can be arranged outside the lower chamber in the drain pipe.