RU1784585C - Settler - Google Patents

Abstract

Usage: wastewater treatment from floating impurities, mainly oil products. SUMMARY OF THE INVENTION: The sump comprises a housing with inlet and outlet pipes, a collection tray for oil products with an overflow edge, a flooded pipeline for driving oil products. Near the collecting chute, an additional conduit with openings for discharging liquid is placed below its overflow edge. 1 s.p. f-ly, 7 ill.

Description

The invention relates to wastewater treatment and can be used to separate floating impurities from the wastewater, mainly petroleum products at treatment plants for industrial and surface (rain, melt) wastewater.

A sump is known, comprising a housing supplying and discharging pipelines, a collector for oil products with an overflow edge, and a device for driving oil products to the collector.

A disadvantage of the known device is its low efficiency. This is due to the fact that during the removal of oil products along with pollution, more water is poured through the overflow edge of the oil collectors. In addition, during the removal of oil products through the gaps between the wall of the sump and the scraper of the oil-driven device, oil products flow into the sump zone, free from oil products This necessitates the repeated repeated removal (removal) of petroleum products, which leads to an increase in the volume of water removed with petroleum products, and the need for the subsequent separation of oil products from water.

A sump (prototype) is known, comprising a casing with supply and discharge pipes, a flooded pipeline for driving oil products and an oil recovery tray with overflow edge.

However, in the known device, during the period when the liquid supply for the removal of petroleum products begins, until the liquid level in the sump reaches the overflow edge of the tray, the surface flow of liquid is not ensured and. accordingly, the movement of petroleum products to the tray. In this regard, only a small part of the surface of the sump in the area where the oil product distribution pipeline is located is freed from the bottom, and the rest of the surface continues to be covered with oil products, for which large supply is required

With

with

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the amount of liquid drained along with oil products into the tray, which reduces the efficiency of the sump,

It is an object of the invention to increase operational efficiency.

For this purpose, a known sump containing a housing with a supply and outlet pipes, a flooded pipeline for driving oil products and an oil collecting tray with an overflow edge, is provided with an additional pipe with one or more openings for draining liquid located at the oil collecting tray below its overflow edge.

In addition, an additional pipeline is placed along the overflow edge of the tray and is made with holes located in the upper part of its cross section.

An additional pipe D located at the oil pan below its overflow edge allows part of the waste fluid to be drained from the sump and thereby creates conditions for the surface layer of fluid to move from the point of discharge of the liquid to the oil pan. This contributes to the concentration of petroleum products at the oil pan and their removal from the sump with less liquid, which increases the efficiency of the sump,

The implementation of an additional pipeline along the overflow edge of the tray and with holes in the upper part of its cross section is advisable with a significant length of the oil pan, because in this case a uniform drainage of part of the liquid along the entire length of the oil pan is achieved and, therefore, more uniform and quiet the flow of the surface liquid layer to the oil collecting tray, which leads to a uniform concentration of oil products along the entire overflow edge of the tray and ensures their removal from the sump with a minimum liquid honors.

Fig. 1 shows a sump in plan (an embodiment of a collection of oil products in the form of trays placed at the walls of the sump); figure 2 is a section aa in figure 1; Fig. 3 is a section B-B in Fig. 1, a state during the period of settling of the waste fluid); Fig. 4 is the same state during the period of oil product removal; Fig. 5 is a plan sedimentation tank (an embodiment of an oil product collector in the form of a funnel-tray placed in the middle part of the sedimentation tank); Fig. b is a section BB of Fig. 5, the state during the period of settling of the waste fluid; Fig.7 is the same, the state during the period of removal of petroleum products

The sump contains a housing 1, along the side walls 2 of which there is an oil collecting device in the form of trays 3 with overflow edge 4 The trays are connected

between each other by a tray 5. A pipe 6 with a valve 7 is introduced into the housing 1 of the settler. In the upper part of the wall of the pipe 6, holes 8 are made for pouring water. Holes 8 can be made round,

slit-like or in the form of a continuous slit-slot or any other shape. Nozzles 9 can be installed above the openings 8. Along the oil collecting trays 3, a pipeline 10 with a valve 11 is placed.

In the upper part of the wall of the pipeline 10, holes 12 are made for draining water from the cavity of the sump

Pipelines 6.10 are located in housing 1 below the liquid level.

A supply pipe 13, a discharge pipe 14 with a valve 15, a pipe 16 with a valve 17 for removing sediment, is connected to the housing 1

To oil collecting trays 3 attached

outlet pipe 18

The oil gathering device can be made in the form of a tray or funnel 3, located in the Central part of the sump, as shown in figure 5 - 7. In this case

the pipeline 10 is placed on both sides of the tray or along its entire outer perimeter

The sump works as follows.

Sewage liquid through a pipe 13 is fed into the cavity of the housing 1 of the sump, in which the sewage flows at a low speed. As a result of this, the lightest impurities (oil products) contained in the fluids float to the surface, and the heaviest impurities settle to the bottom of the sump. The settled clarified wastewater is discharged through the pipe 14 outside the settling tank. In the process of settling the wastewater, its upper level is located below the overflow edge 4 of the tray 3. After settling of the wastewater, as the accumulated oil products accumulate in the settler, they are removed. For this purpose, the valve 15 on the discharge pipe 14 closes, valves 7,11 in pipelines 6, 10 open. Pipeline 6 in

the cavity of the housing 1 is supplied with sewage, which is poured through the openings 8 and nozzles 9 into the cavity of the housing in the direction from the bottom up. As a result, an upward flow of liquid arises in the casing 1 of the sump above the pipe 6, which rises to the surface of the sump

Simultaneously with the flow of wastewater into the cavity of the housing 1 through the pipeline 6, part of the wastewater is discharged from the housing 1 through the openings 12 through the pipeline 10. As a result, a flow of liquid occurs in the surface layer of the wastewater in the settler from the place where the liquid is spilled from the pipeline 6 to the place placing the pipeline 10 and the oil collecting tray 3 (in the direction from the Central part of the sump to its walls when placing the oil sumps at the walls of the sump, as shown in figures 1 to 4, and in the direction from the walls to the sump to its middle part oil skimmer when placed in the middle part of the tray as shown in Figures 5-7)

Moreover, at the location of the upstream flow, the surface of the liquid in the sump reaches the highest level, and at the location of the oil pan the surface of the liquid is at the lowest level

In connection with the organization of the surface fluid flow towards the oil trays and the location of the liquid surface at the oil collector at the lowest level, the oil products present on the liquid surface move and fit to the oil collectors under the influence of the flow. During the organization of the surface flow and the movement of petroleum products to the oil collecting trays, the flow rate of waste fluid entering the housing 1 through the pipeline 6 exceeds the flow rate of the liquid that is discharged from the housing 1 of the sump conduit 10. As a result, simultaneously with the fitting of oil to the oil collecting trays upon receipt of liquid to the casing 1 via line 6 level accommodating the liquid surface in the sump rises and reaches the upper level accommodating overflow oil skimmer wall 4 of the tray, and then exceed it. The petroleum products located at the oil pan through the overflow edge 4 are discharged into the pan 3 and are discharged outside the sump via line 18. Precipitated sediments are periodically removed from the sump through pipe 16.

Removing sludge from the sump can also be done in other ways, for example, using a hydraulic elevator

After the process of removal of oil products from the sump is completed, the valve 7 on the pipeline 6 and the valve 11 on the pipeline 10 are closed, the valve 15 on the discharge pipe 14 is opened. Sewage liquid is supplied through the pipe 13 to the sump, the sump continues to operate in the settling mode

Compared with the known device in the sump, the complete removal of floating oil products is ensured and the amount of water discharged with oil products is many times reduced.

Claims (1)

Formula of the invention 1 A sump containing a housing with a supply and outlet pipes, a flooded pipeline for driving petroleum products and an oil collecting tray with an overflow edge, characterized in that, in order to increase efficiency in operation, it is equipped with an additional pipe with one or more openings for drainage fluid located at the oil pan below its overflow edge 2 The sump according to claim 1, with the exception of the fact that the holes on the additional pipeline are made in the upper part of its cross section fie. IS 9 PE x / -J W and b E Yo gpf / g s / 98St78il 3v eo o- (G With. 1 fS. Sdp / %: e - / - e- - -e- 0 0 & jL with. Su / T tr cvj € & t 0  Co 12 3 2 - about 8-8 Fiz.B 9-B