Water treatment device integrating dissolved gas coalescence and coalescence filtration

Abstract

The utility model relates to a dissolved air coalescence and coalescence filtration integrated water treatment device. According to the technical scheme, a liquid inlet in the lower side of a dissolved gas coalescence tank is connected with an oil-containing water inlet pipe, a gas dissolving cover is installed in an inner cavity, a first-stage filtrate cavity is formed between the gas dissolving cover and the inner wall of the dissolved gas coalescence tank, and an oil liquid layer is formed above the gas dissolving cover; the output end of the gas dissolving pump is connected to the lower side of the gas dissolving cover through a pipeline, the lower side of the first-stage filtrate cavity is connected to the upper portion of an inner cavity of the coalescence filtering tank through a pipeline and a lifting pump, and the oil layer is connected to an oil discharging pipeline through a pipeline and an oil well pump. The lower side of the coalescence filtering tank is connected to a clear water tank through a gathering pipe and a drainage pipeline, one side of the lower part of the clear water tank is connected to the drainage pipeline through a backwashing pipeline, and the other side is connected to the gathering pipe through a pipeline and a backwashing pump. The oil-containing sewage treatment device has the beneficial effects that the dissolved gas coalescence device and the coalescence filtering device are connected in series for use, so that graded multi-coalescence oil-containing sewage treatment is realized, the oil-containing sewage is effectively treated, and the water quality index is improved.

Description

Technical Field

[0001] This utility model relates to the field of oilfield polymer-containing wastewater treatment technology, and in particular to an integrated water treatment device for dissolved gas coalescence and coalescence filtration. Background Technology

[0002] Currently, the volume of wastewater requiring treatment in oilfields is increasing, exceeding the capacity of existing wastewater treatment designs. Current treatment processes primarily rely on sedimentation, resulting in severe exceedances of water quality standards. This poses difficulties and causes damage to subsequent water injection and formations. In particular, since the implementation of chemical flooding and polymer injection in oilfields in recent years, the polymer content in oil wells has become increasingly severe, making the treatment of polymer-containing wastewater more and more difficult. Therefore, research on the treatment of polymer-containing wastewater, especially for water-flooded oil wells, is of great significance in addressing this issue and improving the water quality of oilfield wastewater to meet development needs. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing an integrated dissolved air coalescence and coalescence filtration water treatment device. By using the dissolved air coalescence device and the coalescence filtration device in series, the treatment of oily wastewater with multiple stages of coalescence is achieved, thus realizing integrated treatment of coalesced water.

[0004] This utility model discloses an integrated dissolved air coalescence and coalescence filtration water treatment device, the technical solution of which includes: a dissolved air coalescence tank (T101), a coalescence filtration tank (T201), an air storage tank (T301), a clean water tank (T401), a dissolved air pump (P101), an oil pump (P401), a booster pump (P402), a backwash pump (P403), an air compressor (C301), an oil discharge pipeline (L401), and a drainage pipeline (T403). The oil-containing water inlet pipe (L101) and the oil-containing water inlet pipe (L402) are connected to the lower inlet of the dissolved gas coalescing tank (T101). An aerosol hood (a1) is installed inside the dissolved gas coalescing tank (T101). A primary filtrate chamber (a2) is formed between the aerosol hood (a1) and the inner wall of the dissolved gas coalescing tank (T101). An oil layer (a3) ​​is formed above the aerosol hood (a1). The output of the dissolved gas pump (P101) is... The end is connected to the lower side of the aerosol hood (a1) via a pipeline; the lower side of the primary filtrate chamber (a2) is connected to the upper part of the inner cavity of the coalescing filter tank (T201) via a pipeline and a booster pump (P402); the oil layer (a3) ​​is connected to the oil drain line (L401) via a pipeline and an oil pump (P401); the lower side of the coalescing filter tank (T201) is connected to the clear water tank (T401) via a main pipe (L403) and a drain line (L1). The lower part of the clean water tank (T401) is connected to the drain pipe (L402) via a backwash line (L2) on one side, and to the main pipe (L403) via a line and a backwash pump (P403) on the other side; the air inlet of the air storage tank (T301) is connected to the air compressor (C301) via a line, and the exhaust port of the air storage tank (T301) is collected into the main pipe (L403) via an air supply line (L3) and a control valve (F1).

[0005] Preferably, the output end of the dissolved gas pump (P101) is connected to the pressurizing tank (a6), and the output end of the pressurizing tank (a6) is connected to the lower part of the dissolved gas hood (a1) inside the dissolved gas coalescence tank (T101) through a pipeline and a dissolved gas control valve (a5), and a dissolved gas release head (a4) is connected to the end of the pipeline, with gas outlets evenly distributed on the outer wall of the dissolved gas release head (a4).

[0006] Preferably, the top of the dissolved gas coalescence tank (T101) is provided with a gas storage chamber (a7), and the gas collected in the gas storage chamber (a7) is connected to the air inlet of the dissolved gas pump (P101) through a pipeline.

[0007] Preferably, the bottom of the dissolved gas coalescing tank (T101) is connected to the drain pipe (L402) via a control valve and pipeline.

[0008] Preferably, the inner cavity of the above-mentioned coalescing filter tank (T201) is provided with a modified fiber filter tube layer (b2) and a granular filter media layer (b3) in sequence. A ring of spray heads (b1) is provided above the modified fiber filter tube layer (b2), and a ring of backwash spray heads (b4) is provided below the granular filter media layer (b3).

[0009] Preferably, the top of the coalescing filter tank (T201) is connected to the drain pipe (L402) via a control valve and an external discharge line; the bottom of the coalescing filter tank (T201) is connected to the drain pipe (L402) via a control valve and a line.

[0010] Preferably, the output end of the air compressor (C301) is connected to the air supply line (L3) through the auxiliary air supply line (L4) and the control valve, and the air storage tank (T301) is connected in parallel with the auxiliary air supply line (L4).

[0011] The beneficial effects of this invention are as follows: By using a dissolved air flocculant tank and a flocculant filter tank in series, pressurized oily wastewater from a three-phase separator first enters the dissolved air flocculant tank via pipeline. Pollutants such as oil and suspended solids are adhered to the air bubbles and separated during the ascent. The dissolved air flocculant tank can remove most of the floating oil, dispersed oil, and larger suspended solids. The effluent from the dissolved air flocculant tank is then pumped into the flocculant filter tank. After flocculation and filtration by modified fiber filter tubes and granular filter media, the wastewater is further purified, and the effluent enters the clear water tank for later use. When the oil separated from the top of the dissolved air flocculant tank reaches a certain thickness, it is discharged into the oil drain pipeline by an oil pump. This invention achieves staged, multi-stage flocculant treatment of oily wastewater, resulting in better treatment of wastewater containing polymers, improving the water quality indicators of wastewater treatment, and realizing integrated treatment of polymer-containing water. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of Embodiment 1 of this utility model;

[0013] Figure 2 This is a structural schematic diagram of Embodiment 2 of this utility model;

[0014] In the diagram above: Dissolved gas coalescing tank T101, coalescing filter tank T201, gas storage tank T301, clean water tank T401, dissolved gas pump P101, oil pump P401, booster pump P402, backwash pump P403, air compressor C301, oil drain line L401, drain line L402, collection pipe L403, drain line L1, backwash line L2, air supply line L3, auxiliary air supply line L4, control valve F1, dissolved gas hood a1, primary filtrate chamber a2, oil layer a3, dissolved gas release head a4, dissolved gas control valve a5, pressurization tank a6, gas storage chamber a7, spray head b1, modified fiber filter tube layer b2, granular filter media layer b3, backwash nozzle b4. Detailed Implementation

[0015] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0016] Example 1, referring to Figure 1 This utility model discloses an integrated dissolved air coalescence and coalescence filtration water treatment device, comprising a dissolved air coalescence tank T101, a coalescence filtration tank T201, an air storage tank T301, a clean water tank T401, a dissolved air pump P101, an oil pump P401, a booster pump P402, a backwash pump P403, an air compressor C301, an oil drain pipe L401, a drain pipe L402, and an oil-containing water inlet pipe L101. The lower inlet of the dissolved air coalescence tank T101 is connected to the oil-containing water inlet pipe L101. An air-dissolving hood a1 is installed inside the dissolved air coalescence tank T101, forming a primary filtrate chamber a2 between the air-dissolving hood a1 and the inner wall of the dissolved air coalescence tank T101. An oil layer a3 is formed above the air-dissolving hood a1. The output end of the dissolved air pump P101 is connected to... The pipeline is connected to the lower side of the aerosol hood a1. The lower side of the primary filtrate chamber a2 is connected to the upper part of the inner cavity of the coalescing filter tank T201 through the pipeline and the lift pump P402. The oil layer a3 is connected to the oil drain line L401 through the pipeline and the oil pump P401. The lower side of the coalescing filter tank T201 is connected to the clean water tank T401 through the collection pipe L403 and the drain line L1. One side of the lower part of the clean water tank T401 is connected to the drain line L402 through the backwash line L2, and the other side is connected to the collection pipe L403 through the pipeline and the backwash pump P403. The air inlet of the air storage tank T301 is connected to the air compressor C301 through the pipeline. The exhaust port of the air storage tank T301 is collected into the collection pipe L403 through the air supply line L3 and the control valve F1.

[0017] The output end of the aforementioned dissolved gas pump P101 is connected to the pressurizing tank a6. The output end of the pressurizing tank a6 is connected to the lower part of the dissolved gas hood a1 inside the dissolved gas coalescence tank T101 through a pipeline and a dissolved gas control valve a5. A dissolved gas release head a4 is connected to the end of the pipeline. Gas outlets are evenly distributed on the outer wall of the dissolved gas release head a4.

[0018] The top of the dissolved gas coalescence tank T101 is provided with a gas storage chamber a7, and the gas collected in the gas storage chamber a7 is connected to the air inlet of the dissolved gas pump P101 through a pipeline.

[0019] The bottom of the dissolved gas coalescence tank T101 is connected to the drain pipe L402 via a control valve and pipeline; a level gauge can be installed on one side of the clear water tank T401 to facilitate observation of the water level in the inner cavity.

[0020] The inner cavity of the aforementioned coalescing filter tank T201 is sequentially equipped with a modified fiber filter tube layer b2 and a granular filter media layer b3. A ring of spray heads b1 is provided above the modified fiber filter tube layer b2, and a ring of backwash spray heads b4 is provided below the granular filter media layer b3.

[0021] The top of the coalescing filter tank T201 is connected to the drainage pipe L402 via a control valve and an external discharge line; the bottom of the coalescing filter tank T201 is connected to the drainage pipe L402 via a control valve and a line.

[0022] The output end of the air compressor C301 is connected to the air supply line L3 through the auxiliary air supply line L4 and the control valve. The air storage tank T301 is connected in parallel with the auxiliary air supply line L4.

[0023] When using this utility model,

[0024] By connecting the dissolved air coalescing tank and the coalescing filter tank in series, pressurized oily wastewater from the three-phase separator first enters the dissolved air coalescing tank T101 via pipeline. Pollutants such as oil and suspended solids are adhered to the air bubbles and separated during the upward movement within the dissolved air hood a1. The dissolved air coalescing tank T101 can remove most of the floating oil, dispersed oil, and larger suspended solids. The effluent from the dissolved air coalescing tank T101 is then lifted by the booster pump P402 and enters the coalescing filter tank T201. After coalescence and filtration by modified fiber filter tubes and granular filter media, the wastewater is further purified, and the effluent enters the clear water tank T401 for later use. When the oil separated from the top of the dissolved air coalescing tank T101 reaches a certain thickness, it is discharged into the oil drain pipeline L401 by the oil pump P401.

[0025] In addition, the inner cavity of the clean water tank T401 is connected to the air compressor C301 or the air storage tank T301. When the clean water tank T401 needs pressure, it is connected to the air compressor C301 or the air storage tank T301. The water in the clean water tank T401 can be used as backwash water for the device. When the clean water tank T401 is full of water and the coalescing filter does not need backwashing, the system will activate the control valve on the lower right side to discharge the water in the clean water tank T401 to the drain pipe L402.

[0026] Example 2: The integrated dissolved gas coalescence and coalescence filtration water treatment device mentioned in this utility model includes a dissolved gas coalescence tank T101, a coalescence filtration tank T201, a clear water tank T401, a dissolved gas pump P101, an oil pump P401, a booster pump P402, a backwash pump P403, an oil discharge pipe L401, a drainage pipe L402, and an oil-containing water inlet pipe L101. The lower inlet of the dissolved gas coalescence tank T101 is connected to the oil-containing water inlet pipe L101. An aerosol hood a1 is installed inside the dissolved gas coalescence tank T101, forming a primary filtrate chamber a2 between the aerosol hood a1 and the inner wall of the dissolved gas coalescence tank T101. An oil layer a3 is formed above 1; the output end of the dissolved air pump P101 is connected to the lower side of the dissolved air hood a1 through a pipeline; the lower side of the primary filtrate chamber a2 is connected to the upper part of the inner cavity of the coalescing filter tank T201 through a pipeline and the lift pump P402; the oil layer a3 is connected to the oil drain line L401 through a pipeline and the oil pump P401; the lower side of the coalescing filter tank T201 is connected to the clean water tank T401 through the collection pipe L403 and the drain line L1; one side of the lower part of the clean water tank T401 is connected to the drain line L402 through the backwash line L2, and the other side is connected to the collection pipe L403 through a pipeline and the backwash pump P403.

[0027] The difference from Example 1 is: (Refer to...) Figure 2 The air compressor C301 and the air tank T301 were eliminated. Although this caused the clean water tank T401 to lose pressure and the outward flow of water was due to natural gravity, the function of treating polymer-containing wastewater of this utility model can still be accomplished.

[0028] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. An integrated water treatment device combining dissolved gas coalescence and coalescence filtration, characterized in that: The system includes a dissolved gas coalescing tank (T101), a coalescing filter tank (T201), a gas storage tank (T301), a clean water tank (T401), a dissolved gas pump (P101), an oil pump (P401), a booster pump (P402), a backwash pump (P403), an air compressor (C301), an oil drain line (L401), a drain line (L402), and an oil-containing water inlet pipe (L101). The lower inlet of the dissolved gas coalescing tank (T101) is connected to the oil-containing water inlet pipe (L101). An aerosol hood (a1) is installed inside the dissolved gas coalescing tank (T101), forming a primary filtrate chamber (a2) between the aerosol hood (a1) and the inner wall of the dissolved gas coalescing tank (T101). An oil layer (a3) ​​is formed above the aerosol hood (a1). The output end of the dissolved gas pump (P101) is connected to the lower part of the aerosol hood (a1) via a pipeline. On one side, the lower side of the primary filtrate chamber (a2) is connected to the upper part of the inner cavity of the coalescing filter tank (T201) via a pipeline and a booster pump (P402). The oil layer (a3) ​​is connected to the oil drain line (L401) via a pipeline and an oil pump (P401). The lower side of the coalescing filter tank (T201) is connected to the clean water tank (T401) via a collection pipe (L403) and a drain line (L1). One side of the lower part of the clean water tank (T401) is connected to the drain line (L402) via a backwash line (L2), and the other side is connected to the collection pipe (L403) via a pipeline and a backwash pump (P403). The air inlet of the air storage tank (T301) is connected to the air compressor (C301) via a pipeline. The exhaust port of the air storage tank (T301) is collected into the collection pipe (L403) via an air supply line (L3) and a control valve (F1).

2. The water treatment device of claim 1, wherein the water treatment device is characterized by: The output end of the dissolved gas pump (P101) is connected to the pressurizing tank (a6). The output end of the pressurizing tank (a6) is connected to the lower part of the dissolved gas hood (a1) inside the dissolved gas coalescence tank (T101) through a pipeline and a dissolved gas control valve (a5). A dissolved gas release head (a4) is connected to the end of the pipeline. Gas outlets are evenly distributed on the outer wall of the dissolved gas release head (a4).

3. The water treatment device of claim 2, wherein the device is characterized in that: The top of the dissolved gas coalescence tank (T101) is provided with a gas storage chamber (a7), and the gas collected in the gas storage chamber (a7) is connected to the air inlet of the dissolved gas pump (P101) through a pipeline.

4. The water treatment device of claim 2, wherein the device is characterized in that: The bottom of the dissolved gas coalescing tank (T101) is connected to the drainage pipeline (L402) via a control valve and pipeline.

5. The water treatment device of claim 1, wherein the water treatment device is characterized by: The inner cavity of the coalescing filter tank (T201) is sequentially equipped with a modified fiber filter tube layer (b2) and a granular filter media layer (b3). A ring of spray nozzles (b1) is provided above the modified fiber filter tube layer (b2), and a ring of backwash nozzles (b4) is provided below the granular filter media layer (b3).

6. The water treatment device of claim 5, wherein the device is characterized in that: The top of the coalescing filter tank (T201) is connected to the drainage pipe (L402) via a control valve and an external discharge line; the bottom of the coalescing filter tank (T201) is connected to the drainage pipe (L402) via a control valve and a pipeline.

7. The water treatment device of claim 1, wherein the water treatment device is characterized by: The output end of the air compressor (C301) is connected to the air supply pipeline (L3) through an auxiliary air supply pipeline (L4) and a control valve, and the air tank (T301) is connected in parallel with the auxiliary air supply pipeline (L4).

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