Sewage treatment device for carbon dioxide gas field

Abstract

The utility model discloses a carbon dioxide gas field sewage treatment device which comprises a three-phase separator, a sewage buried tank is arranged at the downstream of the three-phase separator, a first electric ball valve is arranged at the downstream of the sewage buried tank, a first combined pool is arranged at the downstream of the first electric ball valve, and a second combined pool is arranged at the downstream of the second electric ball valve. The first combined tank comprises a water collecting tank, an adjusting tank and a sludge tank, the downstream of the first combined tank is provided with a second combined tank, the second combined tank comprises a first settling tank and a homogenizing tank, the downstream of the second combined tank is provided with a third combined tank, and the third combined tank comprises a second settling tank and a homogenizing tank. The third combined tank comprises a hydrolysis tank, an aerobic tank, a second sedimentation tank and a coagulative precipitation tank, and a first dosing device, a blast unit and a buffer unit are arranged at the downstream of the third combined tank. The carbon dioxide gas field sewage treatment device combines physical treatment and chemical treatment, effectively treats sewage and sludge, and is high in efficiency, especially suitable for oil field sewage treatment and high in practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to an oilfield sewage treatment equipment, more exactly, it is a carbon dioxide gas field sewage treatment device. BACKGROUND

[0002] In the exploitation process of oilfield, need to handle a large number of oilfield sewage, because these sewage mixed with quite a proportion of sludge and oil stain, the present treatment effect is not good, need to further improve. INNOVATION CONTENT

[0003] Based on this, it is necessary to provide a carbon dioxide gas field sewage treatment device for the above technical problems.

[0004] In order to solve the above technical problems, the utility model adopts the technical scheme as follows:

[0005] A carbon dioxide gas field sewage treatment device, characterized in that the carbon dioxide gas field sewage treatment device comprises a three-phase separator, a sewage buried tank is arranged downstream of the three-phase separator, a first electric ball valve is arranged downstream of the sewage buried tank, a first combined pool is arranged downstream of the first electric ball valve, the first combined pool comprises a water collecting pool, an adjusting pool and a sludge pool, a second combined pool is arranged downstream of the first combined pool, the second combined pool comprises a first sedimentation pool and a homogenizing pool, a third combined pool is arranged downstream of the second combined pool, the third combined pool comprises a hydrolysis pool, an aerobic pool, a second sedimentation pool and a coagulation sedimentation pool, a first dosing device, a blowing unit and a buffer unit are arranged downstream of the third combined pool.

[0006] As a preferred embodiment of the utility model, the first dosing device adds medicine for the coagulation sedimentation pool through a first dosing pipeline.

[0007] As a preferred embodiment of the utility model, a first magnetic force pump is arranged between the water collecting pool and the adjusting pool, a second magnetic force pump is arranged between the adjusting pool and the first sedimentation pool, a first pipeline pump is arranged between the homogenizing pool and the hydrolysis pool, the bottom of the first sedimentation pool, the bottom of the hydrolysis pool, the bottom of the second sedimentation pool and the bottom of the coagulation sedimentation pool are all connected with the sludge pool through a first pipeline,

[0008] A third magnetic force pump is arranged on the first pipeline, the coagulation sedimentation pool is connected with the buffer unit through a second pipeline, and the buffer unit comprises a second electric ball valve and a buffer tank.

[0009] As a preferred embodiment of the utility model, the first sedimentation tank is connected with the first pipeline through the fourth switch, the hydrolysis tank is connected with the first pipeline through the third switch, the second sedimentation tank is connected with the first pipeline through the second switch, and the coagulation sedimentation tank is connected with the first pipeline through the first switch.

[0010] As a preferred embodiment of the utility model, the carbon dioxide gas field sewage treatment device further comprises a sludge dewatering unit, the sludge dewatering unit comprises a stirrer, a second dosing device, a filter and a sewage submersible pump, the stirrer is connected with the sludge tank through a conveying pipeline, the second dosing device is dosed through a second dosing pipeline, a second pipeline pump is arranged between the stirrer and the filter, an outlet of the filter is connected with the sewage submersible pump through a sewage discharge pipeline, and an outlet of the sewage submersible pump is connected with an inlet of the water collecting tank through a backflow pipeline.

[0011] As a preferred embodiment of the utility model, the air blowing unit comprises a plurality of air blowers, and the air blowers blow air for the second sedimentation tank and the homogeneous tank of the aerobic tank through air supply pipelines.

[0012] As a preferred embodiment of the utility model, a filter grid is arranged on the water inlet of the water collecting tank.

[0013] As a preferred embodiment of the utility model, the aerobic tank is filled with biological filler.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The carbon dioxide gas field sewage treatment device combines physical treatment and chemical treatment, effectively treats sewage and sludge, has high efficiency, is particularly suitable for treating oil field sewage, and has high practicality. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the scheme in the utility model, the drawings needed in the embodiment description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0017] Figure 1 It is a schematic view of the three-dimensional structure of the carbon dioxide gas field sewage treatment device of the utility model.

[0018] The markings in the diagram are explained as follows: 1. Three-phase separator; 10. First dosing pipeline; 11. Conveying pipeline; 2. Underground sewage tank; 3. First electric ball valve; 4. First dosing device; 5. Blower unit; 51. Blower; 6. Buffer unit; 61. Second electric ball valve; 62. Buffer tank; 7. Second pipeline; 8. Sludge dewatering unit; 81. Mixer; 82. Second dosing device; 83. Filter; 84. Submersible pump; 85. Sewage discharge pipeline; 86. Return pipeline; 9. Air supply pipeline; C1, First Magnetic pump; C2, second magnetic pump; C3, third magnetic pump; G1, first pipeline pump; G2, second pipeline pump; K1, first switch; K2, second switch; K3, third switch; K4, fourth switch; P, second combined tank; P1, first sedimentation tank; P2, homogenization tank; Q, third combined tank; Q1, hydrolysis tank; Q2, aerobic tank; Q3, second sedimentation tank; Q4, coagulation sedimentation tank; S, first combined tank; S1, water collection tank; S11, filter screen; S2, equalization tank; S3, sludge tank. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, the wastewater treatment device for the carbon dioxide gas field includes a three-phase separator 1. Downstream of the three-phase separator 1 is a wastewater underground tank 2. Downstream of the wastewater underground tank 2 is a first electric ball valve 3. Downstream of the first electric ball valve 3 is a first combined tank S. The first combined tank S includes a collection tank S1, an equalization tank S2, and a sludge tank S3. Downstream of the first combined tank S is a second combined tank P. The second combined tank P includes a first sedimentation tank P1 and an equalization tank P2. Downstream of the second combined tank P is a third combined tank Q. The third combined tank Q includes a hydrolysis tank Q1, an aerobic tank Q2, a second sedimentation tank Q3, and a coagulation sedimentation tank Q4. Downstream of the third combined tank Q are a first dosing device 4, an aeration unit 5, and a buffer unit 6.

[0021] The first dosing device 4 adds chemicals to the coagulation sedimentation tank Q4 through the first dosing pipe 10.

[0022] A first magnetic pump C1 is installed between the collection tank S1 and the equalization tank S2. A second magnetic pump C2 is installed between the equalization tank S2 and the first sedimentation tank P1. A first pipeline pump G1 is installed between the homogenization tank P2 and the hydrolysis tank Q1. The bottom of the first sedimentation tank P1, the bottom of the hydrolysis tank Q1, the bottom of the second sedimentation tank Q3, and the bottom of the coagulation sedimentation tank Q4 are all connected to the sludge tank S3 through a first pipeline 6S.

[0023] In addition, the water inlet of the water collecting tank S1 is provided with a filter grid S11.

[0024] The first pipeline 6S is provided with a third magnetic pump C3, the coagulation sedimentation tank Q4 is connected with the buffer unit 6 through a second pipeline 7, and the buffer unit 6 comprises a second electric ball valve 61 and a buffer tank 62.

[0025] The first sedimentation tank P1 is connected with the first pipeline 6S through a fourth switch K4, the hydrolysis tank Q1 is connected with the first pipeline 6S through a third switch K3, the second sedimentation tank Q3 is connected with the first pipeline 6S through a second switch K2, and the coagulation sedimentation tank Q4 is connected with the first pipeline 6S through a first switch K1.

[0026] The carbon dioxide gas field sewage treatment device further comprises a sludge dewatering unit 8, the sludge dewatering unit 8 comprises a stirrer 81, a second dosing device 82, a filter 83 and a sewage pump 84, the stirrer 81 is connected with the sludge tank S3 through a conveying pipeline 11, the second dosing device 82 is dosed through a second dosing pipeline 800, the stirrer 81 and the filter 83 are provided with a second pipeline pump G2, the outlet of the filter 83 is connected with the sewage pump 84 through a sewage discharge pipeline 85, and the outlet of the sewage pump 84 is connected with the inlet of the water collecting tank S1 through a backflow pipeline 86.

[0027] The air blowing unit 5 comprises a plurality of air blowers 51, and the air blowers 51 blow air for the second sedimentation tank Q3, the aerobic tank Q2 and the homogenizing tank P2 through air supply pipelines 9.

[0028] The working mode of the carbon dioxide gas field sewage treatment device will be described below.

[0029] The raw sewage passes through the three-phase separator 1 and the sewage buried tank 2 to obtain the production sewage which is preliminarily treated. After the production sewage is removed of sundries through the filter grid S11, the production sewage enters the water collecting tank S1 to balance the water volume and ensure the stable operation of the system. The sewage can be discharged into the adjusting tank S2 through the first magnetic pump C1, so that the biochemical treatment system can continue to input the waste water when the production is stopped.

[0030] After a certain period of adjustment, the sewage is transferred to the first sedimentation tank P1 through the second magnetic pump C2, the suspended solids in the water are removed by the natural sedimentation of the water, the suspended solids are settled to the sludge hopper at the bottom of the first sedimentation tank P1, and the sludge is transferred to the sludge tank S3 through the first pipeline 6S and the third magnetic pump C3. The clarified water flows into the homogenizing tank P2, so that the water quality and quantity are uniform, thereby ensuring the stable biochemical water quality.

[0031] The sewage stays in the homogenizing tank P2 for a period of time, and then is lifted into the hydrolysis tank Q1 by the first pipeline pump G1, which has a mixing function. The hydrolysis tank Q1 is subjected to anaerobic reaction, effectively improving the removal rate of COD, and converting high-molecular and difficult-to-degrade organic matters into low-molecular and easy-to-degrade organic matters, which is beneficial to subsequent aerobic treatment. The sludge generated in the anaerobic process is transmitted to the sludge tank S3 by the first pipeline 6S and the third magnetic pump C3.

[0032] The biological filler is installed in the aerobic tank Q2, further decomposing the organic matters into inorganic matters. The second sedimentation tank Q3 is used for separating the sludge and water, returning the shed biological membrane or suspended sludge to the aerobic tank or the sludge tank. The effluent of the second sedimentation tank Q3 enters the coagulation and sedimentation tank Q4.

[0033] The first dosing device 4 starts to add reagents, further removing suspended solids, petroleum and total phosphorus and other pollutants through reaction. The generated sludge is transmitted to the sludge tank S3 by the first pipeline 6S and the third magnetic pump C3, and the sewage enters the buffer tank 62. The buffer tank 62 is used to receive the discharged wastewater, and the wastewater exceeding the standard in the emergency state can be returned to the water collecting tank S1 for continuous treatment.

[0034] The sludge in the sludge tank S3 enters the sludge dewatering unit 8 through the conveying pipeline 11. The second dosing device 82 adds reagents, and the filter 83 is used for dewatering. The dry sludge is transported and disposed, and the supernatant and the filter press liquid are returned to the water collecting tank S1 for continuous treatment.

[0035] It should be noted that the reagents added in the carbon dioxide gas field sewage treatment device include PAC basic aluminum oxide, and the dosage is 100-200 mg / L, and PAM polyacrylamide, and the dosage is 5-10 mg / L. The dosage is calculated based on the water volume (1 m3 / h), and most of the reagents enter the sludge.

[0036] The carbon dioxide gas field sewage treatment device combines physical treatment and chemical treatment, effectively treats the sewage and sludge, has high efficiency, is especially suitable for the treatment of oilfield sewage, and has high practicability.

[0037] Obviously, the above-described embodiments are only part of the embodiments of the present application, and are not all the embodiments. The preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application.

Claims

1. A carbon dioxide gas field wastewater treatment apparatus, characterized by comprising: The carbon dioxide gas field sewage treatment device comprises a three-phase separator (1), a sewage buried tank (2) arranged downstream of the three-phase separator (1), a first electric ball valve (3) arranged downstream of the sewage buried tank (2), a first combined pool (S) arranged downstream of the first electric ball valve (3), wherein the first combined pool (S) comprises a water collecting pool (S1), an adjusting pool (S2) and a sludge pool (S3), a second combined pool (P) arranged downstream of the first combined pool (S), wherein the second combined pool (P) comprises a first sedimentation pool (P1) and a homogenizing pool (P2), a third combined pool (Q) arranged downstream of the second combined pool (P), wherein the third combined pool (Q) comprises a hydrolysis pool (Q1), an aerobic pool (Q2), a second sedimentation pool (Q3) and a coagulation sedimentation pool (Q4), and a first dosing device (4), an air blowing unit (5) and a buffer unit (6) arranged downstream of the third combined pool (Q).

2. The carbon dioxide gas field wastewater treatment apparatus according to claim 1, characterized by The first dosing device (4) is used for adding chemicals into the coagulation sedimentation pool (Q4) through a first dosing pipeline (10).

3. The carbon dioxide gas field wastewater treatment apparatus according to claim 2, characterized by A first magnetic force pump (C1) is arranged between the water collecting pool (S1) and the adjusting pool (S2), a second magnetic force pump (C2) is arranged between the adjusting pool (S2) and the first sedimentation pool (P1), a first pipeline pump (G1) is arranged between the homogenizing pool (P2) and the hydrolysis pool (Q1), and the bottom of the first sedimentation pool (P1), the bottom of the hydrolysis pool (Q1), the bottom of the second sedimentation pool (Q3) and the bottom of the coagulation sedimentation pool (Q4) are connected with the sludge pool (S3) through a first pipeline (6S). A third magnetic force pump (C3) is arranged on the first pipeline (6S), the coagulation sedimentation pool (Q4) is connected with the buffer unit (6) through a second pipeline (7), and the buffer unit (6) comprises a second electric ball valve (61) and a buffer tank (62).

4. The carbon dioxide gas field wastewater treatment apparatus according to claim 3, characterized by The first sedimentation pool (P1) is connected with the first pipeline (6S) through a fourth switch (K4), the hydrolysis pool (Q1) is connected with the first pipeline (6S) through a third switch (K3), the second sedimentation pool (Q3) is connected with the first pipeline (6S) through a second switch (K2), and the coagulation sedimentation pool (Q4) is connected with the first pipeline (6S) through a first switch (K1).

5. The carbon dioxide gas field wastewater treatment apparatus according to claim 3, characterized by The carbon dioxide gas field sewage treatment device further comprises a sludge dewatering unit (8), the sludge dewatering unit (8) comprises a stirrer (81), a second dosing device (82), a filter (83) and a sewage pump (84), the stirrer (81) is connected with the sludge pool (S3) through a conveying pipeline (11), the second dosing device (82) is dosed through a second dosing pipeline (800), a second pipeline pump (G2) is arranged between the stirrer (81) and the filter (83), the outlet of the filter (83) is connected with the sewage pump (84) through a sewage pipeline (85), and the outlet of the sewage pump (84) is connected with the inlet of the water collecting pool (S1) through a backflow pipeline (86).

6. The carbon dioxide gas field wastewater treatment apparatus according to claim 1, characterized by The air blowing unit (5) comprises a plurality of air blowers (51), and the air blowers (51) blow air to the second sedimentation tank (Q3), the aerobic tank (Q2) and the homogenizing tank (P2) through air supply pipelines (9).

7. The carbon dioxide gas field wastewater treatment apparatus according to claim 1, characterized by A filter grid (S11) is arranged on the water inlet of the water collecting pool (S1).

8. The carbon dioxide gas field wastewater treatment apparatus according to claim 1, characterized by The aerobic tank (Q2) is filled with biological fillers.

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