RU2104956C1 - Plant for treatment of oil-containing sewage waters - Google Patents

Abstract

FIELD: treatment of sewage waters containing oil products and suspended matter. SUBSTANCE: plant has cylindroconical body; pipelines supplying oil-containing sewage waters; devices for withdrawal of purified water, oil products and sediments; fine filters; settling reservoir with horizontal bottom inclined in direction of liquid flow and connected with cylindroconical body with the help of L-shaped branch pipe and located at the level of beginning of body control part with its horizontal part passing to the level of oil-containing sewage waters entering the body. Pipeline supplying oil-containing sewage waters at its outlet has U-shaped branch pipe located above level of the face of oil-containing sewage for possible deflection of supplied flow of liquid from body upper plane. EFFECT: higher efficiency. 1 dwg

Description

 The invention relates to a device for wastewater treatment, containing petroleum products and suspended solids, and can be used in oil refining, chemical and other industries.

 Known oil separator containing a housing in the form of a horizontal reservoir, dividing walls separating the housing into inlet and outlet sections, and a separation section with oil breaker plates, the bottom having an inclination in the direction of movement of the liquid, with an outlet window for purified water and sediment, a transverse diaphragm with an opening in inlet section supplying a reservoir with liquid, inlet and outlet nozzles (1).

 The disadvantage of this oil separator is the low reliability of operation, since there is no separation into components, water and sediment are removed through the same window, resulting in clogging of the window by sediment. The low capacity of the oil separator is due to the significant hydraulic resistance to the flow created by the diaphragm in the inlet section.

 The closest in technical result is a device for the purification of oily wastewater containing a cylindrical body, mounted one on the other along the axis of the funnel device, pipelines for supplying wastewater, drainage of purified water, oil products and purified water and a scraper for removing oil products. The device is equipped with a thin-layer module installed in the housing concentrically with funnels and a cylinder-conical baffle mounted coaxially above the thin-layer module and dividing the upper part of the housing into the collection chamber for oil products and clarified water, the clarified water collection chamber is equipped with replaceable filters (2).

The disadvantage of this device is:
- the complexity of its design, constant monitoring and repair of rotating mechanisms and scrapers;
- upon termination of the fluid supply, a reverse outflow of oil products from the oil separator is possible due to the absence of a jet break and a connection with the atmosphere.

 The problem to which the invention is directed, is the purification of oily wastewater with the possibility of using water in reverse cycles, simplifying the design and operation of the installation, as well as increasing the reliability in operation.

 The task is achieved through the installation for the treatment of oily wastewater containing a cylindrical housing, pipelines for supplying oily wastewater and the removal of purified water, oil products and sludge, fine filters, characterized in that it is equipped with a horizontal settling tank with an inclined bottom in the direction of movement fluid in communication with the cylinder-conical body at the level of the beginning of its conical part with the help of a L-shaped pipe, the upper horizontal part of which is placed at water level in the housing, wherein the inlet conduit of oily wastewater outlet is provided with U-shaped pipe located above the mirror oily waste, with reflection supplied liquid flow from the upper plane of the housing.

 A significant difference of the proposed installation is the presence of an additional settling tank (horizontal) with an inclined bottom in the direction of fluid movement, which communicates with the cylinder-conical body at the level of the beginning of its conical part using the L-shaped pipe, the upper horizontal part of which is placed at the water level in the body, while the pipeline for supplying oily wastewater at the outlet is equipped with a U-shaped pipe located above the mirror level of oily effluents with the possibility of reflection Nia supplied liquid flow from the upper plane of the housing.

 The use and location of the L-shaped pipe allows water to flow by gravity into the settling tank.

 The presence of a U-shaped pipe at the end of the oil-containing wastewater supply pipe, located above the level of the effluent mirror with the possibility of reflecting the supplied fluid flow from the upper plane of the casing, allows the wastewater to be dispersed evenly, while oil droplets accumulate, forming a dense layer. As a result of contact with the molecules of the oil, the suspended particles are bonded and remain in its layer.

 Larger particles sink to the bottom of the cylinder-conical body.

 The drawing shows the installation for the purification of oily wastewater, General view.

 The installation comprises a vertical-cylindrical housing 1, an inlet pipe 2 for supplying oil-containing wastewater, ending with a U-shaped pipe 3, which is located above the level of the mirror of oil-containing wastewater. The outlet pipe 4 for discharging conditionally clean water from the cylinder-conical body to the settling tank 5. The pipe 4 is made L-shaped and is located at the level of the beginning of the conical part of the body 1 with the horizontal part reaching the level of oil-containing wastewater in the cylinder-conical body. The sump 5 is made horizontal with an inclined bottom in the direction of movement of the purified water. Pipeline 6 for the removal of petroleum products, located at a distance of 1/3 of the highest level of petroleum products in the housing. A pipe 7 is embedded in the pipeline 6 for monitoring oil products in a cylindrical housing. The pipeline 8 is located in the lower part of the settling tank 5 for the removal of conditionally clean water from it into the circulating network. To bring water to sanitary standards, it is passed through fine filters 9. An overflow pipe 10 is located in the upper part of the settling tank 5 to prevent accidental overflow of water from it.

 Precipitation from the housing 1 and the sump 5, respectively, are removed through the stop valves through pipelines 11 and 12.

 Installation work. The oily effluents to be cleaned enter the cylinder-conical housing 1 through an inlet pipe 2 ending in a U-shaped pipe 3 by periodically opening the shutoff valves. The frequency of discharge of wastewater into the cylindrical housing 1 depends on the amount of their receipt for treatment and is visually determined by the oil control pipe 7. The U-shaped pipe located above the oil-containing effluent mirror allows to reduce the speed of the working fluid flow, its energy is extinguished after hitting the upper plane of the housing, evenly scattered. The presence in the oily effluents of particles of various densities and dispersities with different specific gravities leads to stratification: the upper most light product is oil, emulsion, conditionally pure water and sediment in the form of solids.

 A significant part of the mechanical suspension arriving with drains is enveloped by oil molecules and remains in the upper layer.

 This significant layer of oil products acts as a battery - a filter of mechanical suspensions.

 The oil products accumulated in the cylinder-conical casing are pumped out through the pipeline 6. According to the practical analysis, the discharge frequency depends on the amount of oil-containing wastewater arriving for treatment and is visually determined by the oil control pipe 7.

 Conditionally clean water from the cylinder-conical body through the L-shaped pipe 4 by gravity enters the settling tank with an inclined bottom in the direction of fluid movement.

 The location of the L-shaped pipe at the level of the beginning of the conical part is due to the results of experimental tests, since the lower the water withdrawal, the cleaner the water, the less oil products it contains.

 In the settling tank, the water is in a calmer state, and is almost ready for reuse in a closed circulating system, where it enters through pipeline 8. If necessary, for finer water treatment that meets sanitary standards, it is additionally passed through fine filters 9.

 In the case of excess water in the settling tank, it is removed through an overflow pipe 10.

 The sediment of mechanical impurities that accumulates in the housing 1 and in the settling tank 5 is periodically removed by opening the valves through the pipelines 11 and 12, respectively.

 The proposed installation for the treatment of oily wastewater is simple in design and operation, practically does not require monitoring and maintenance, is applicable in systems with a reverse cycle, reliable in operation.

Claims (1)

 Installation for the purification of oily wastewater containing a cylindrical housing, pipelines for supplying oily wastewater and the removal of purified water, oil products and sludge, fine filters, characterized in that it is equipped with a horizontal settling tank with an inclined bottom in the direction of fluid flow, communicating with the cylindrical the housing at the level of the beginning of its conical part with the help of a L-shaped pipe, the upper horizontal part of which is placed at the water level in the housing, while the pipe rovod supplying oily waste water outlet is provided with U-shaped pipe located above the mirror oily waste, with reflection supplied liquid flow from the upper plane of the housing.