RU2142423C1 - Settler for crude oil-containing waters - Google Patents

Abstract

FIELD: waste water treatment. SUBSTANCE: settler is provided with longitudinal horizontal barrier shaped in the form of trapezium in its cross section. Barrier is equipped with connection pipes located under each cartridge filter and overflow device connected top part of preliminary-settling chamber with top part of final-settling chamber. EFFECT: enhanced water treatment efficiency and increased choice of coalescence filters. 1 dwg

Description

 The invention relates to the field of oily wastewater treatment technology and can be used in the oil, refining, petrochemical and other industries whose wastewater contains oil and oil products.

 Known sump for water purification from oil and mechanical impurities, including a tank separated by transverse mesh partitions, between which granular material with coalescing properties is placed, overflow partitions and pipelines for supplying source water and removing components (A.S. USSR No. 262837).

 A device for treating bilge water is known, comprising a container divided by a vertical partition into chambers of preliminary and additional sedimentation, cartridge coalescing filter elements placed in the additional sedimentation chamber and communicated with the preliminary sedimentation chamber by common collectors, devices for supplying source water and removing components ("Fisheries" ", N 1, 1976, pp. 30 - 32).

 The source water is supplied to the pre-settling chamber, then partially purified water containing emulsified oil enters the cartridge coalescing filter elements. Passing them, emulsified oil is enlarged and separated with water in the additional settling chamber. The separated phases are then diverted from the vessel.

 A disadvantage of the known device is the inefficient removal of coarse, film and droplet oil and mechanical impurities from the treated water entering the cartridge coalescing filter elements, resulting in a reduced resource and reliability of their operation, their performance is reduced due to a decrease in filtering ability, which ultimately leads to reduce the efficiency of purification of oily waters.

 The aim of the present invention is to increase the cleaning efficiency, the performance of the sump and increase the resource of the coalescing filter.

 This goal is achieved by the fact that the longitudinal partition is made trapezoidal in cross section and is equipped with nozzles located under each cartridge filter and a bypass device connecting the upper part of the preliminary sludge chamber with the upper part of the final settling chamber.

 The drawing shows a schematic longitudinal section of the sump and its cross section.

 The sump contains a tank 1, which is divided by a longitudinal horizontal trapezoidal partition 2 into chambers of preliminary B and final C settling, coalescing cartridge filters 3 installed on the partition 2, through which chambers B and C are connected, pipe 4 for supplying source water, pipe 5 for removal purified water, nozzles 6 for drainage of precipitated solids, an oil collector 7 with a regulator 8 of the oil-water interface and a nozzle 9 for oil drainage. Under each cartridge filter 3, a nozzle 10 is attached to the baffle 2, through which purified water enters the cartridge filter 3 and which prevents the oil that has surfaced in the pre-settling chamber from entering the cartridge filters. In the central part of the tank, the baffle 2 is equipped with a bypass device 11, made in the form of a pipe, which is attached to the baffle 2 and serves to transfer oil trapped in the pre-settling chamber and accumulated in its upper part to the upper part of the final settling chamber, bypassing the cartridge filters 3.

 The sump works as follows. The source water through a pipe 4, which acts as a distributor, is supplied to a preliminary sedimentation chamber, where preliminary sedimentation is carried out, as a result of which mechanical impurities are deposited in the lower part of the chamber, and coarse oil floats and accumulates under the trapezoidal partition 2. From here it is through a passage the device - the tube 11 enters the upper part of the chamber of the final sludge C and, as it accumulates in the oil reservoir 7, is discharged using the interphase level controller 8 through pipe 9 to the oil treatment unit.

 Partially purified from coarse oil and mechanical impurities, water containing emulsified oil passes through the nozzles 10 into the cartridge filters 3, and through them into the final settling chamber C. In cartridge coalescing filters 3, coarsening of small particles of emulsified oil that float in the final settling chamber C and are discharged from the tank 1 through the oil collector 7. The nozzles 10 mounted under the cartridge filters 3 prevent them from being caught in the pre-sedimentation chamber B coarse oil, due to which it is forced to flow through the bypass device 11 to the upper part of the final sludge chamber C. The purified water from chamber C is discharged through line 5, and the precipitated solids are periodically drained through nozzles 6.

 Application of the proposed design of the sump will significantly increase the efficiency of water treatment, the performance of the sump and increase the life of coalescing filters. Obtaining this effect is ensured by the fact that coarse oil trapped in the preliminary settling chamber due to the trapezoidal execution of the longitudinal partition, the presence of nozzles under each cartridge filter and the bypass device is collected under the trapezoidal partition and, bypassing the cartridge coalescing filters, is fed through the bypass device to the upper part of the chamber final defense. At the same time, the coalescing cartridge filters are unloaded from the passage of coarse and droplet oil trapped in the preliminary settling chamber, thereby achieving both an increase in the performance of the coalescing filters and the sump as a whole. In addition, as a result of the bypass of drip and film oil, bypassing coalescing filters, the latter have a longer service life, since drip oil carries a large amount of mechanical impurities that could clog coalescing filters. Water containing only emulsified oil and fine mechanical particles that cannot quickly contaminate the coalescing filters is passed through coalescing filters.

Claims (1)

 A sump for the purification of oily water, containing a tank, a baffle, preliminary and final settling chambers, coalescing cartridge filters, pipelines for supplying source water and removing components, characterized in that the baffle is made longitudinal, horizontal and trapezoidal in cross section and is equipped with nozzles located under each a cartridge filter, and a bypass device connecting the upper part of the pre-settling chamber to the upper part of the final settling chamber vania.