SU1286529A1 - Petroleum trap - Google Patents

Abstract

The invention relates to devices for the treatment of wastewater from petroleum products and mechanical impurities, which makes it possible to increase the efficiency of wastewater treatment. The oil trap contains pre-treatment chambers 4, settling 5, purified water 6, skimming tray 9, thin-layer blocks of 10 and 1 G, floating hollow skimming screen 12 equipped with heating elements located above the cavity in the upper shell layer, the lower shell of the screen has holes that let its cavity with a settling chamber; the upper part of the cavity is provided with a pipeline 14 for draining oil products. The chamber 4 is equipped with a stirrer 7, the tray 9 is connected by a flexible pipe 15 with a cavity 13. 5 Cp. f-ly, 4 ill. with (L

Description

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The invention relates to the field of wastewater treatment, namely their purification from petroleum products and mechanical impurities.

The purpose of the invention is to improve the efficiency of wastewater treatment.

Fig, 1 shows the oil trap, a longitudinal section; Fig, 2 - oil screen, a longitudinal section; in FIG. 3, the same cross section; 4, 4 - inlet chamber with stirrer.

The oil trap includes a housing 1 divided by semi-submersible partitions 2 and 3 into pre-treatment chambers A, settling 5 and purified water 6. The pre-cleaning chamber is equipped with a stirrer 7 with a horizontal shaft submerged by a partition 8 located in front of the semi-submersible partition 2, the pre-cleaning chamber settling, oil collection tray 9, adjacent to the partition 2,

The settling chamber 5 comprises a thin layer block 10 and an additional block 11, located respectively at the beginning and end of chamber 5 and pivotally connected to partitions 2 and 3, respectively, as well as a floating gathering screen 12,

The oil collecting screen has a cavity 13, which is molded in the form of a channel with increasing height, the upper part of which is connected to the pipeline 14 for the removal of oil products. The cavity 13 of the screen is connected by a flexible pipe 15 to an electrofusion tray 9. . . I -.

Pre-cleaning chamber 4 is provided with a supply pipe 20.

The purified water chamber is provided with a catchment tray 21 connected to a discharge pipe 22,

Stirrer 7 flexible blades 23, made in the form of brushes

The oil trap works as follows.

Sewage fluid containing petroleum products is supplied through the inlet

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the pipeline 20 in the pre-treatment chamber 4, where sand and suspended matter are deposited. The coarsely dispersed oil products float up, are captured by the brush blades 23 of the agitator 7 and are transferred to the oil collecting tray 9, the edge of which plays the role of a knife removing the petroleum products from the blades of the agitator 7,

A stream of waste liquid, entering through the partition 8 into the settling chamber 5, passes through the agitators 7 rotating towards the flow blades 23, Oil products that do not: float to the surface and are in the volume of water, stick to the skimmer 23 and transfer to the skimmer 9 ,

Passing the space between the partitions 8 and 2, the waste liquid enters the inter-shelf space of the thin-layer block I1, where intensive phase separation occurs. The sediment slides down and enters the tank when the oil floats below the bottom surface of the shelves, rises up and moves to the oil collection screen 12. The water leaving the thin layer block 11 is evenly distributed over the cross section of the settling chamber 5 and moves to the thin layer block 10. When this happens, further separation of petroleum products and suspended substances from the waste liquid occurs. Then, the waste liquid passes through the countercurrent thin layer unit 10, in which it is additionally cleaned from oil products. The purified water enters chamber 6, is collected by chute 21, and discharged through line 22 from the oil trap.

Oil products released in the settling chamber accumulate under the bottom surface of the oil collecting screen 12, coalesce, through holes 19 in the lower shell 18 of the screen enter the cavity 13, move to its upper part and through pipe 14 are drained out of the oil trap. Oil products from the oil collection tray 9 through the flexible pipe 15 enter the cavity 3 and further into the pipeline 14,

In winter, the upper shell 17 of the oil collecting screen 12 above its cavity is heated with the help of heating elements 16, as a result

In this case, the upper thin layer of trapped petroleum products in contact with the upper shell liquefies and plays the role of a lubricant when petroleum products move to the upper part of the cavity 13, which improves their removal

Sludge removal from the oil trap is carried out by known methods (for example, a hydraulic elevator from the water pre-treatment chamber and a sediment for sludge, from the settling chamber, using perforated pipes).

The oil trap can also operate in a reagent mode. In this case, the reagents are fed into the stream of wastewater entering the treatment, and the processes of mixing and flocculation proceed in the pre-treatment chamber, which are intensified by the operation of the mixer.

The proposed oil trap (as compared to the known one) provides 1.3–1.5-fold increase in wastewater treatment efficiency by improving the hydraulic conditions of gravitational separation of oil products and suspended solids in thin-layer modules and the settling chamber, the presence of an agitator in the pre-settling chamber , a higher temperature of the waste liquid in winter. The design of the oil collector screen provides a high degree of separation of oil products and water, allows to obtain low-watered oil products, which simplifies their utilization, improves the conditions for the removal of oil products, especially in winter, prevents their evaporation in summer. Placing the heating elements in the upper shell of the screen above its hollow makes it possible and sufficient to remove trapped oil products in the winter time to heat only their upper thin layer in contact with the surface of the upper shell, and not the weight of the liquid, as in the well-known oil trap. Due to this, as well as a sharp decrease in heat transfer in the presence of a screen between warm waste liquid and cold air in winter. The absence of a scraper conveyor with electric drive, a pre lag oil trap ensures a reduction in energy consumption for heating and operation of the conveyor by 3-4 times

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ABOUT

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Claims (6)

Invention Formula ., 1. The oil trap containing a body divided by semi-submersible partitions into chambers of pre-treatment, settling and purified water, a device for supplying and discharging phases, a thin-layer block located at the outlet of the settling chamber, oil collection tray ,. characterized in that, in order to increase the efficiency of wastewater treatment, the settling chamber is equipped with a floating oil collection screen, hollow hollow with an upper shell of oleophobic material and a bottom of oleophilic material with openings that communicate the cavity of the shield with the sedimentation chamber. , 2. The Neftelovushka under item 1, characterized in that the cavity of the oil recovery screen is made in the form of a channel with increasing height, the upper part of which is connected to a pipeline for draining oil products. 3. Neftelovushka according to claim 1, which is such that the oil collection screen is equipped with heating elements located in the layer of the upper shell. 4. The neftelovushka according to claim 1, characterized in that the pre-cleaning chamber is equipped with a chopper with flexible blades in the form of brushes made of oleophilic material. 5. The oil trap according to claim 1, characterized in that the oil collection tray of the pre-cleaning chamber is connected to the cavity of the oil collecting screen by means of a flexible pipe. I 6. The oil trap according to claim 1, characterized in that it is provided with an additional thin layer block pivotally connected to a semi-submersible partition separating the pre-cleaning chamber from the settling chamber, while the thin layer block mounted at the exit of the settling chamber is pivotally connected to the semi-immersion partition separating the settling chamber from the chamber of purified water. (pye. tf