RU2243167C1 - Device for cleaning oil-containing sewage water - Google Patents

Abstract

FIELD: treatment of sewage; cleaning oil-containing water from oil and mechanical impurities.

SUBSTANCE: proposed device is made in form of inclined pipe divided into sections for separation of water and oil and coalescing section filled with granules of hydrophobic material by 0.5-0.7 volume for their free motion. Sewage water is delivered by means of collector provided with branch pipes smoothly located over length of coalescing section.

EFFECT: increased operation cycle and productivity due to self-regeneration of granules of hydrophobic material.

5 cl, 1 dwg

Description

The invention relates to the field of wastewater treatment used for waterflooding of oil fields and is used to purify oil-containing wastewater from oil and suspended solids, mainly during field discharge in a well production system.

A device for purifying water from oil products and mechanical impurities is known, which is a vertical apparatus with a conical distributor, the cavity of which is filled with a coalescing material with a layer of contact mass from oil under it (AS No. 682242, op. 30.08.79, IPC ² V 01 D 17/02, C 02 C 1/26).

A disadvantage of the known device is the high density of coalescing material granules, which leads to their coalescence under the action of asphalt-resinous oil components and entails a decrease in the performance of the treatment apparatus and the need to stop it to regenerate the coalescing charge. In other words, the known device is characterized by a short cycle of work associated with the need for regeneration or replacement of the coalescing charge.

The closest in the number of similar essential features to the proposed device is a sump for the treatment of oily wastewater by a.s. No. 617374 (op. 30.07.78, IPC ² С 02 С 1/26, В 01 D 17/02). The sump is a horizontal tank divided by partitions into sections for the separation of water and oil and a coalescing section with two filters filled with hydrophobic material. In the section for the allocation of water and oil, inclined shelves and flow distributors are placed, and the sump is also equipped with nozzles for inputting the initial waste water and outputting separate components.

The well-known settler has the same disadvantages as the above-described device, since the granules of the coalescing material are placed in filters with a high density of contact with each other, that is, the known settler is also characterized by a short cycle of the device and, as a consequence, low productivity. Another disadvantage is the large metal consumption and the complexity of maintenance.

Thus, the problem arose of creating a high-performance and easy-to-maintain device for the treatment of oily wastewater in well production systems.

The technical result is an increase in the duration of the cycle of the device by self-regeneration of oil granules with mechanical impurities.

The specified technical result is achieved by a known device for the treatment of oily wastewater, including a housing with partitions separating it into sections for the separation of oil and water and a coalescing section with granules of hydrophobic material placed between the above sections, means for introducing an oily wastewater into the coalescing section and outlet pipes separate components, in which, according to the invention, the coalescing section is filled with granules of hydrophobic material in 0.5-0.7 volumes of coalescing the first section with the possibility of their free movement during cleaning and from below is limited by a mesh partition, and the casing is made in the form of an inclined pipe, while the oil and water separation sections are connected by a transfer pipe, all sections are interconnected in the lower part of the casing, and the oil-containing waste input means water is made in the form of a collector.

It is advisable that the mesh size of the mesh partition is less than the diameter of the granules of the hydrophobic material.

Inclined pipe can be installed at an angle of 1-4 ° to the horizontal.

The ratio of the diameter of the inclined pipe to its length can be at least 1:15.

It is advisable to place the manifold nozzles evenly along the entire length of the coalescing section with an increase in the diameter of each subsequent nozzle along the course of the movement of oily wastewater.

Filling the coalescing section with granules of hydrophobic material with the possibility of their free movement in the space of the section, which is ensured by filling it with 0.5-0.7 volumes, allows organizing their chaotic movement and collisions under the action of the high-speed pressure of water jets from the collector and Archimedean forces. The result is the destruction of deposits locally arising on the granules, which ensures their self-regeneration, eliminates adhesion and ultimately increases the cycle of the device.

The execution of the housing in the form of an inclined pipe with a certain ratio of diameter to length (at least 1:15) allows, in combination with a collector distributed along the length of the coalescing section, to enhance the effect of oil separation from water and self-regeneration of the load.

The connection of the water and oil separation sections by the transfer pipe allows the oil layer partially forming in the water separation section to flow into the oil separation section.

The communication of the sections at the bottom of the device together with the signs of an “inclined pipe” allows the oil layer from the coalescing section to move to the oil separation section, and the water layer to the water separation section.

The proposed device is shown in the attached figure, where 1 is a body in the form of an inclined pipe, divided by partitions 2 into a section for the allocation of water 3, a coalescing section 4 and an oil separation section 5.

The device is equipped with a supply manifold 6 and nozzles for the output of oil 7, water 8 and sediment 9. Each subsequent nozzle of the collector 6 is increased in diameter in comparison with the previous one. The water separation sections 3 and oil 5 are interconnected by a transfer pipe 10. Moreover, the length of the water separation section 3 is commensurate with the total length of the coalescing section 4 and the oil separation section 5. The coalescing section 4 is bounded below by a mesh partition 11. The device operates as follows. Oil-containing wastewater through the collector 6 enters the coalescing section 4, filled with granules of hydrophobic material for 0.5-0.7 volume section. The purified water passes through a hydrophobic filter, represented by a layer of oil and granular material, oil globules contained in water are adsorbed on the surface of the granules of the hydrophobic material and, when a certain critical value of saturation is reached, they begin to come off in the form of large droplets, which are trapped, along with the admixtures, by liquid hydrophobic filter. During the cleaning process, particles of oil and solids adhere to the granules, however, their active movement creates conditions for self-regeneration of the granules and elimination of their adhesion. Caught and contaminated oil from the coalescing section 4, due to the inclination of the pipe 1, moves to the oil separation section 5 and is discharged via pipeline 7, water from the water separation section 3 is discharged by pipe 8. Sediment is discharged through pipes 9. Partially separated oil from section 3 along the overflow pipe 10 flows into section 5.

Thus, the proposed device creates the conditions for eliminating the sticking of granules of coalescing material and their self-regeneration, which makes it possible to increase the duration of the cycle of the device and, as a result, its performance. In addition, the proposed device is simple and reliable in operation and maintenance.

Claims (5)

1. A device for the treatment of oily wastewater, including a housing with partitions separating it into sections for the separation of oil and water and a coalescing section with granules of hydrophobic material placed between the above sections, means for introducing an oily wastewater into the coalescing section and the outlet pipes of the separated components, characterized in that the coalescing section is filled with granules of a hydrophobic material for 0.5-0.7 volumes of the coalescing section with the possibility of their free movement during the eye drain and bottom is limited by a grid partition, and the casing is made in the form of an inclined pipe, while the oil and water separation sections are connected by a transfer pipe, all sections are interconnected in the lower part of the casing, and the oil-containing wastewater input means is made in the form of a collector. 2. The device according to claim 1, characterized in that the mesh size of the mesh partition is made smaller than the diameter of the granules of the hydrophobic material. 3. The device according to claim 1, characterized in that the inclined pipe is installed at an angle of 1-4 ° to the horizontal. 4. The device according to claim 1, characterized in that the ratio of the diameter of the inclined pipe and its length is at least 1:15. 5. The device according to claim 1, characterized in that the manifold nozzles are placed evenly along the length of the coalescing section with an increase in the diameter of each subsequent nozzle along the path of the oily wastewater.