Oil-water separation precision treatment system

Abstract

The utility model discloses an oil-water separation fine treatment system, which belongs to the field of sewage treatment systems, and comprises a tank body, an oily wastewater inlet, a uniform distributor, a water outlet arranged at the bottom of the tank body, an oil collector and an oil outlet arranged at the top of the tank body, and a water outlet arranged above the right side of the tank body, and a plurality of oil gathering nets are arranged between the water outlet and the uniform distributor. According to the utility model, a plurality of oil gathering nets are arranged between the oily wastewater inlet and the oily wastewater outlet. The oil gathering net takes a stainless steel net as a base body, a nickel-based plating layer is arranged on the surface of the oil gathering net, and the oil gathering net has super-oleophylic and super-hydrophobic characteristics, can remove oil particles which cannot be removed by a conventional oil-water separation device through active gathering of fine oil particles and multi-stage separation, achieves the purpose of fine treatment of oil-water separation, is suitable for treatment of various kinds of oil-containing wastewater, and has a good application prospect. And the device can also be used as a deep precision treatment device of the existing oil-water separation device.

Description

Technical Field

[0001] The utility model relates to a sewage treatment system, in particular to an oil-water separation fine treatment system. Background Art

[0002] According to environmental protection requirements, sewage discharged into urban underground drainage networks and rivers, lakes and seas must be treated, among which oil content is an important indicator and can only be discharged after oil-water separation. According to Stokes' law, when the water temperature is constant, the rising speed of oil particles in aqueous solution is proportional to the square of the particle size of the oil particles. The larger the diameter of the oil particles, the faster they rise and separate. Traditional oil-water separation devices separate larger diameter oil particles through physical methods such as filter interception and inclined plate aggregation and floating. This is passive oil-water separation, and the separation effect of fine oil particles in oil and water is poor. Utility Model Content

[0003] The utility model aims to provide an oil-water separation fine treatment system which can realize oil-water separation fine treatment.

[0004] The technical solution of the utility model is: an oil-water separation fine treatment system, comprising at least one fine treatment device, the fine treatment device comprising a tank body, an oily wastewater inlet arranged at the lower left side of the tank body, a uniform distributor arranged in the tank body, a drain outlet arranged at the bottom of the tank body, an oil collector and an oil drain outlet installed on the top of the tank body, a water outlet arranged at the upper right side of the tank body, and a plurality of oil gathering nets arranged between the water outlet and the uniform distributor.

[0005] According to a further technical solution, the water outlet of the upper-stage fine treatment device is connected to the oily wastewater inlet of the lower-stage fine treatment device through a pipeline.

[0006] According to a further technical solution, the oil collecting net is a mesh cylindrical body, the base of the oil collecting net is a stainless steel net, and the surface of the oil collecting net is provided with a nickel-based coating.

[0007] According to a further technical solution, the tank body is provided with an inspection flange above the water outlet.

[0008] Beneficial effects of the utility model:

[0009] In the utility model, the water inlet of the oily wastewater is arranged below the tank body, and the water outlet is arranged above the tank body, and a plurality of oil-collecting nets are arranged between the water inlet and the water outlet of the oily wastewater. The oil-collecting net in the utility model is based on a stainless steel net, and a nickel-based coating is arranged on its surface, which has super-oleophilic and super-hydrophobic properties. The utility model actively gathers fine oil particles and performs multi-stage separation to remove oil particles that cannot be removed by conventional oil-water separation devices, thereby achieving the purpose of oil-water separation and fine treatment. The utility model is suitable for the treatment of various oily wastewaters, and can also be used as a further fine treatment device for existing oil-water separation devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of Example 1 of the utility model.

[0011] Figure 2 This is a schematic diagram of the structure of Example 2 of the utility model.

[0012] Figure 3 This is a schematic diagram of the structure of Example 3 of the utility model.

[0013] Among them, 1. fine treatment device, 2. oily wastewater inlet, 3. distributor, 4. drain outlet, 5. outlet, 6. oil collection net, 7. maintenance flange, 8. oil collector, 9. oil drain outlet. DETAILED DESCRIPTION

[0014] The present invention is further described and understood by way of non-limiting examples below.

[0015] According to Stokes Law:

[0016] Vt=(g / 18μ)(ρ 水 -ρ 油 )Dp 2

[0017] in:

[0018] Vt—Oil particle rising speed,

[0019] g—acceleration due to gravity,

[0020] μ—gravity viscosity coefficient of water,

[0021] ρ 水 — the density of water,

[0022] ρ 油 — density of the oil,

[0023] Dp—diameter of oil particles,

[0024] When the water temperature is constant, the above formula can be simplified to: Vt = K*Dp2 , that is, the speed at which oil particles rise in aqueous solution is proportional to the square of the particle size of the oil particles. The larger the diameter of the oil particles, the faster they rise and separate, thus achieving oil-water separation.

[0025] An oil-water separation fine treatment system includes at least one fine treatment device 1, the fine treatment device 1 includes a tank body, an oily wastewater inlet 2 arranged at the lower left side of the tank body, a distributor 3 arranged in the tank body, a drain port 4 is arranged at the bottom of the tank body, an oil collector 8 and an oil drain port 9 are installed on the top of the tank body, a water outlet 5 is arranged at the upper right side of the tank body, and a maintenance flange 7 is arranged on the tank body above the water outlet 5. A plurality of oil-collecting nets 6 are arranged between the water outlet 5 and the distributor 3. The oil-collecting net 6 is a mesh cylindrical body, the base of the oil-collecting net 6 is a stainless steel net, and the surface of the oil-collecting net 6 is provided with a nickel-based coating. Water and oil have different wetting angles and surface tensions on the micro-surface of the selected coarse-grained material. The oil-collecting net 6 allows tiny oil particles to aggregate and grow on the surface of the material and then detach from the surface and float to the oil collector 8, thereby achieving the purpose of separating water and oil.

[0026] When multiple polishing devices 1 are provided, the polishing devices 1 are provided in series. The water outlet 5 of the polishing device 1 of the previous stage is connected to the oily wastewater inlet 2 of the polishing device 1 of the next stage through a pipeline.

[0027] The working process of the device provided by the utility model is as follows:

[0028] Example 1: Working principle of single-stage equipment

[0029] like Figure 1 As shown, the oily wastewater enters the tank body through the oily wastewater inlet 2, and flows from bottom to top in a stable flow after passing through the distributor 3. A plurality of oil-collecting nets 6 are evenly installed inside the tank body, and the oil-collecting net 6 is a net-type cylindrical body. When the oily wastewater passes through the oil-collecting net 6, tiny oil particles aggregate and grow on the surface of the material, and then separate and float to the oil collector 8 on the top of the tank body, and finally the oil is discharged through the oil discharge port 9.

[0030] Example 2-3: Dual-machine and multi-stage working principle

[0031] like Figure 2-3 As shown, in order to further improve the oil-water separation effect, the outlet 5 of the upper-level fine treatment device 1 is connected to the oily wastewater inlet 2 of the lower-level fine treatment device 1 through a pipeline. Through multiple stages in series, oil is removed step by step to achieve the purpose of more refined oil removal.

[0032] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An oil-water separation fine treatment system, comprising at least one fine treatment device, characterized in that: The fine treatment device includes a tank body, an oily wastewater inlet arranged at the lower left side of the tank body, and a distributor arranged in the tank body. A drain outlet is arranged at the bottom of the tank body, an oil collector and an oil drain outlet are installed on the top of the tank body, and a water outlet is arranged at the upper right side of the tank body. A plurality of oil collection nets are arranged between the water outlet and the distributor.

2. The oil-water separation fine treatment system according to claim 1, characterized in that: The water outlet of the upper-stage polishing device is connected to the oily wastewater inlet of the lower-stage polishing device through a pipeline.

3. The oil-water separation fine treatment system according to claim 1, characterized in that: The oil collecting net is a mesh cylindrical body, the base of the oil collecting net is a stainless steel net, and the surface of the oil collecting net is provided with a nickel-based plating layer.

4. The oil-water separation fine treatment system according to claim 1, characterized in that: The tank body is provided with an inspection flange above the water outlet.

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