SU1527177A1 - Arrangement for treating oil-containing waste water - Google Patents

Abstract

The invention relates to the oil-producing, oil-refining and petrochemical industries, in particular, to equipment for the treatment of wastewater containing oil or products of its processing. The purpose of the invention is to improve the quality of water purification and reduce material costs. The device includes a settling tank with plates placed in it at an angle to the horizon, supplying and discharging communications. The plates are placed in the gas zone in blocks that are mirrored relative to each other, with the upper ends of the plates being stepwise displaced relative to each other in the vertical and horizontal planes, and the lower ends immersed in the liquid to the same depth. The device is equipped with spraying heads mounted on the supply pipe in the gas plane of symmetry of the specularly reflected blocks of plates. 1 il.

Description

The invention relates to the oil-producing, oil-refining and petrochemical industries, in particular to equipment for the treatment of wastewater containing oil or its products.

The purpose of the invention is to improve the quality of water purification and reduce material costs.

The drawing shows the proposed device, a longitudinal section.

A device for treating oil-containing waste water includes a sedimentation tank 1, a pipeline 2 for supplying treated water with spray heads 3 installed on it,

placed symmetrically with respect to blocks of inclined plates 4.

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The blocks of the inclined plates 4 are mirrored relative to each other, with the upper ends of the plates being stepwise displaced relative to each other in the vertical and horizontal planes, and the lower ends immersed in the liquid to the same depth. A collector 5 is located in the upper liquid layer to drain the oil to which the pipelines are attached 6 with oil collectors 7. In the lower part of the settling tank 1 a catchment box 8 is placed for draining purified water.

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The device works as follows.

In the gas zone of the settling tank 1, the purified water is fed through the pipeline 2 through the spray head 3. The 3 drops formed by the spray heads fall onto the inclined plates 4. When the drops fall in a gaseous medium, and then when they are deposited on the water surface formed by a thin layer of water flowing down from the plates 4, the spherical soils contained in the drops of water are deformed into a film at the interface of a liquid — a gas that stretches across its surface under the action of molecular surface tension forces and easily merges with similar oil drops of other droplets.

When a flat water jet flows into the purified water, the film oil easily transforms into the oil layer. Oil is removed from the oil collectors 7 and then discharged through the collector 5 to the pump buffer tank. Purified water containing 8–14 mg / l of oil (99.92% of water purification) is discharged from the apparatus using a sump 8.

The use of spraying heads, spaced in the gas zone, ensures reliable, non-metal-consuming and efficient distribution of the fluid being cleaned between a large number of flow-receiving plates, fast delivery of droplets to the water-gas interface on the carrier plates in connection with droplets falling in the medium viscosity (in gas) and, therefore, an increase in the speed of the cleaning process.

Improving the quality of cleaning and reducing material costs when placing the plates in blocks relative to each other mirrored is ensured by the uniform loading of the falling drops of each of the blocks in connection with their symmetry. The decrease in the specific flow rate per unit area of the apparatus in the zone of water and oil extraction is associated with diluting it in different directions of the apparatus and forming a gas zone between the blocks, in which the water droplets are crushed and deformed. Step arrangement of plates protruding under each other vertical axis of symmetry of the apparatus on

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square, provides the same number of drops from the falling stream, the largest of them flying the longest way and falling on the lower plates (the pressure in the spraying head is the same for all drops), which ensures that the degree of cleaning of the droplets of different sizes (in larger drops x requires more time to reach the boundary with the gas).

The descending flow ensures the cleanliness of the water-gas surface and the rapid removal of drops of oil from the sprinkling zone with oil films spread on them, freeing up space for others, which is necessary to implement the principle of cleaning and increase the specific productivity of the apparatus. The descending flow of the water being purified ensures the rapid inertial passage of water through the layer of oil accumulating on the surface.

The device is operational when purifying water of any 1 density, salinity at a temperature above the freezing point of water and solidification of the removed oil or its products, while the inequality must be observed

(Jer 64 (g,

where ng surface tension, respectively, at the water-gas, water-oil (petroleum), oil-gas

The use of the device allows to increase the degree of wastewater treatment while increasing productivity.

Claims (1)

Invention Formula A device for cleaning oil-containing waste water, including a settling tank with gas and liquid zones, containing plates placed in it at an angle to the horizon, supply and discharge pipelines, which are designed to improve the quality of water purification and reduce material costs, the plates are placed in the gas zone of the tank in blocks that are mirrored relative to each other, with the upper ends of the plates being staggered relative to each other in the vertical and horizontal planes, and 5I527I776 the lower ends are immersed in a liquid with dexters located at the same depth in the plane, while the supply pipe to the symmetry of specularly reflected blocks is provided with spouting plates.  / :: J: L LV .--: l -vi - v l