A multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater

Abstract

The utility model provides a kind of multistage high-pressure reverse osmosis concentration treatment device for shale gas wastewater, belong to shale gas exploitation wastewater treatment technical field, including reverse osmosis tank, reverse osmosis tank is equipped with reverse osmosis component, and reverse osmosis component is equipped with pretreatment component.The utility model is equipped with reverse osmosis component, using three reverse osmosis membrane shell multistage high-pressure reverse osmosis structure of successive series, shale gas wastewater can be concentrated separation gradually, and processing precision is high, and desalination effect is stable;High-pressure reverse osmosis membrane is matched with high-pressure pump to provide high-pressure drive, can effectively cope with high salt, high impurity shale gas wastewater condition, improve fresh water recovery rate and concentrated water concentration multiple;Multistage series layout makes wastewater process reasonable, pressure is fully utilized, while ensuring treatment effect, improve overall operation efficiency;Each membrane shell is connected by connecting pipe specification intercommunication, water production, concentrated water, water inlet passage are independent, can effectively reduce the risk of liquid series, guarantee device long-term stable operation.

Description

Technical Field

[0001] This utility model relates to the field of shale gas extraction wastewater treatment technology, and more specifically, to a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater. Background Technology

[0002] Shale gas extraction generates a large amount of production wastewater with high salinity and high pollutant concentration, which requires professional treatment to achieve standard discharge or reuse. High-pressure reverse osmosis technology has advantages such as high separation efficiency and small footprint, and has been widely used in the purification and concentration treatment of industrial wastewater. Multi-stage reverse osmosis combined process can gradually increase the wastewater concentration ratio, improve water resource recovery rate and salt retention effect.

[0003] A search revealed that Chinese Patent Publication No. CN117699931A discloses "a wastewater treatment device for shale gas extraction, relating to the field of wastewater treatment technology. The device includes a treatment tank and a collection tank; an outlet is provided in the middle of a partition; a sliding gate is provided on the surface of the partition facing the treatment tank; the gate seals the outlet and its bottom penetrates the bottom wall of the treatment tank; a drainage drive assembly is provided at the bottom of the treatment tank; a mesh scraper is slidably connected to the bottom wall of the treatment tank and connected to the top of the gate; a feeding and agitating component is also provided inside the treatment tank, which can inject chemicals and agitate the wastewater. This invention has a simple structure, with the outlet opening gradually from top to bottom to avoid agitating sediment, enabling rapid separation of treated water and sediment; and the mesh scraper can quickly push the sediment to one side for collection, making it highly practical." However, it still has the following drawbacks:

[0004] In practical use, the shale gas wastewater treatment device has a complex overall structure and numerous transmission components. Components such as lead screws, slides, and hinged connecting rods are prone to wear and jamming under the corrosive and scouring conditions of wastewater, resulting in poor operational stability. The gate and filter components are tightly fitted, making them susceptible to sludge blockage and difficult to clean and maintain. The linkage structure between the mesh scraper and the gate is prone to motion interference, leading to incomplete sludge discharge and sediment accumulation. The feeding and agitating components employ a multi-drive, separate design, resulting in insufficient uniformity of reagent mixing and weak overall sealing and corrosion resistance, making them prone to leakage and corrosion over long-term operation, thus affecting wastewater treatment efficiency and the device's lifespan. Therefore, a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater is proposed. Utility Model Content

[0005] The purpose of this invention is to address the problems of complex structure, easy clogging, and poor operational stability of existing shale gas wastewater treatment devices by providing a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater, thereby solving the aforementioned problems.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0007] The present invention is as follows: a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater, comprising a reverse osmosis tank, a reverse osmosis component installed on the reverse osmosis tank, and a pretreatment component installed on the reverse osmosis component;

[0008] The reverse osmosis assembly includes a mounting frame fixedly connected inside the reverse osmosis tank. Three reverse osmosis membrane housings are evenly arranged on the mounting frame. Each of the three reverse osmosis membrane housings is equipped with a high-pressure reverse osmosis membrane. The three reverse osmosis membrane housings are connected in series in multiple stages through connecting pipes. Each reverse osmosis membrane housing has an inlet and a concentrate port at its top and bottom, respectively. Each reverse osmosis membrane housing has a product water port on its side wall. The reverse osmosis tank has a wastewater inlet and a freshwater outlet at its top and bottom, respectively. The inlet port of the first reverse osmosis membrane housing is connected to the wastewater inlet through a connecting pipe. The concentrate port of the last reverse osmosis membrane housing is connected to a discharge pipe. The discharge pipe passes through the side wall of the reverse osmosis tank and extends to the outside. A high-pressure pump is installed on the wastewater inlet, and the input end of the high-pressure pump is connected to a delivery pipe.

[0009] As a preferred technical solution of this utility model, the pretreatment component includes a pretreatment tank installed at the end of the conveying pipe away from the high-pressure pump. The bottom of the pretreatment tank has a discharge port, the conveying pipe is connected to the discharge port, and the inner wall of the pretreatment tank is sequentially equipped with a grid filter, a quartz sand filter layer, and an activated carbon adsorption layer. The top of the pretreatment tank has a feed port.

[0010] As a preferred technical solution of this utility model, a control box is installed on the outer wall of the reverse osmosis tank, a controller is installed inside the control box, a touch screen is installed on the control box, and the high-pressure pump and the touch screen are both electrically connected to the controller.

[0011] As a preferred technical solution of this utility model, a check valve is installed at the output end of the high-pressure pump, and a pressure sensor is installed on the connecting pipe corresponding to the wastewater inlet. The pressure sensor is electrically connected to the controller.

[0012] As a preferred technical solution of this utility model, a freshwater pipeline is installed on the freshwater outlet, and an electric water outlet valve is installed on the freshwater pipeline. The electric water outlet valve is electrically connected to the controller.

[0013] As a preferred technical solution of this utility model, an electromagnetic flow meter is installed on the conveying pipe, and the electromagnetic flow meter is electrically connected to the controller.

[0014] As a preferred technical solution of this utility model, an electric regulating valve is installed on the discharge pipe, and a connecting flange is fixedly connected to the end of the discharge pipe away from the reverse osmosis tank. The electric regulating valve is electrically connected to the controller.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. Through the configured reverse osmosis components, a multi-stage high-pressure reverse osmosis structure with three reverse osmosis membrane housings connected in series can be used to concentrate and separate shale gas wastewater step by step, achieving high treatment accuracy and stable desalination effect. The high-pressure reverse osmosis membranes, together with high-pressure pumps, provide high-pressure drive, effectively handling the high-salt and high-impurity conditions of shale gas wastewater, improving freshwater recovery rate and concentrate concentration ratio. The multi-stage series layout makes the wastewater flow process reasonable and makes full use of pressure, improving overall operating efficiency while ensuring treatment effect. Each membrane housing is connected by a standardized connecting pipe, and the permeate, concentrate, and inlet channels are independent and clear, which can effectively reduce the risk of cross-contamination and ensure long-term stable operation of the unit.

[0017] 2. Through the pretreatment components, a three-stage progressive treatment process involving a grid filter, a quartz sand filter layer, and an activated carbon adsorption layer can pre-intercept suspended impurities, particulate matter, and some organic matter in the wastewater, effectively protecting the subsequent high-pressure reverse osmosis membrane from contamination, clogging, and scratches. The three-stage filtration layers are clearly defined and have a reasonable filtration gradient, which can significantly improve the quality of the wastewater influent, extend the service life of the reverse osmosis membrane, and reduce the frequency of cleaning. The pretreatment tank has a high degree of structural integration, and the impurity interception and adsorption effects are stable, which can reduce the load on the high-pressure reverse osmosis system and improve the overall treatment efficiency and operational reliability of the device. Attached Figure Description

[0018] Figure 1 A schematic diagram of a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater provided by this utility model;

[0019] Figure 2 A front view of a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater provided by this utility model;

[0020] Figure 3 This utility model provides a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater. Figure 2 A schematic diagram of the three-dimensional cross-sectional structure at point AA;

[0021] Figure 4 A schematic diagram of the pretreatment component of a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater provided by this utility model;

[0022] Figure 5 This utility model provides a schematic diagram of the controller and touch screen display for a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater.

[0023] The diagram shows: 1. Reverse osmosis tank; 2. Reverse osmosis module; 3. Pretreatment module; 201. Mounting bracket; 202. Reverse osmosis membrane housing; 203. High-pressure reverse osmosis membrane; 204. Connecting pipe; 205. Inlet port; 206. Concentrate port; 207. Product water port; 208. Wastewater inlet; 209. Freshwater outlet; 210. Discharge pipe; 211. High-pressure pump; 212. Delivery pipe; 301. Pretreatment tank; 302. Discharge port; 303. Grille screen; 304. Quartz sand filter layer; 305. Activated carbon adsorption layer; 306. Inlet port; 4. Control box; 5. Controller; 6. Touch screen display; 7. Check valve; 8. Pressure sensor; 9. Freshwater pipeline; 10. Electric outlet valve; 11. Electromagnetic flow meter; 12. Electric regulating valve; 13. Connecting flange. Detailed Implementation

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.

[0025] Example: Figure 1-5 As shown, this embodiment proposes a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater, including a reverse osmosis tank 1, a reverse osmosis component 2 installed on the reverse osmosis tank 1, and a pretreatment component 3 installed on the reverse osmosis component 2.

[0026] like Figure 3 and Figure 5As shown, the reverse osmosis assembly 2 includes a mounting bracket 201 fixedly connected inside the reverse osmosis tank 1. Three reverse osmosis membrane housings 202 are evenly arranged on the mounting bracket 201. Each of the three reverse osmosis membrane housings 202 is equipped with a high-pressure reverse osmosis membrane 203. The three reverse osmosis membrane housings 202 are connected in series via connecting pipes 204. Each reverse osmosis membrane housing 202 has an inlet 205 and a concentrate 206 at its top and bottom, respectively. Each reverse osmosis membrane housing 202 has a product water 207 on its side wall. The reverse osmosis tank 1 has a wastewater inlet 208 and a freshwater outlet 209 at its top and bottom, respectively. The inlet 205 of the first reverse osmosis membrane housing 202 is connected to the wastewater inlet 208 via connecting pipe 204. The concentrate 206 of the last reverse osmosis membrane housing 202 is connected to a discharge pipe 210. The discharge pipe 210 penetrates the side wall of the reverse osmosis tank 1 and extends to the outside. A high-pressure pump 211 is installed on the wastewater inlet 208. The input end of pump 211 is connected to delivery pipe 212. During use, reverse osmosis tank 1 provides a closed and stable operating space for the entire treatment device. The mounting bracket 201 inside reverse osmosis tank 1 positions and fixes the three reverse osmosis membrane housings 202 to ensure that the reverse osmosis membrane housings 202 do not shake or shift under high pressure. Each of the three reverse osmosis membrane housings 202 is equipped with a high-pressure reverse osmosis membrane 203. They are connected in series in multiple stages through connecting pipe 204 to form a progressively concentrated treatment process. High-pressure pump 211 draws wastewater and pressurizes it through delivery pipe 212, and sends it into the first reverse osmosis membrane housing 202 from wastewater inlet 208. Under high pressure, the wastewater passes through the high-pressure reverse osmosis membrane 203 to achieve separation. The product water is collected and discharged to the freshwater outlet 209, while the concentrated water enters the discharge pipe 210 through the last reverse osmosis membrane housing 202 for external discharge. The multi-stage series structure can significantly improve the concentration ratio and freshwater recovery rate, and adapt to the complex water quality treatment requirements of high salt and high impurity shale gas wastewater.

[0027] like Figure 4 As shown, the pretreatment component 3 includes a pretreatment tank 301 installed at the end of the conveying pipe 212 away from the high-pressure pump 211. The bottom of the pretreatment tank 301 has an outlet 302, and the conveying pipe 212 is connected to the outlet 302. The inner wall of the pretreatment tank 301 is sequentially equipped with a grid filter 303, a quartz sand filter layer 304, and an activated carbon adsorption layer 305. The top of the pretreatment tank 301 has an inlet 306. In use, the pretreatment tank 301 performs pre-purification treatment on the shale gas raw water to avoid impurities... Suspended solids directly entering the high-pressure reverse osmosis membrane 203 can cause blockage and scratches. Wastewater enters the tank from the top inlet 306, first passing through the grid filter 303 to intercept large particles, then through the quartz sand filter layer 304 to remove fine suspended solids, and finally through the activated carbon adsorption layer 305 to remove organic matter, colloids, and some color. After treatment, the wastewater enters the conveying pipe 212 from the bottom outlet 302. Multi-stage pretreatment can effectively reduce the wastewater pollution index, reduce the subsequent reverse osmosis load, and extend the service life of the high-pressure reverse osmosis membrane 203.

[0028] like Figure 1 and Figure 5 As shown, a control box 4 is installed on the outer wall of the reverse osmosis tank 1. A controller 5 is installed inside the control box 4, and a touch screen display 6 is installed on the control box 4. The high-pressure pump 211 and the touch screen display 6 are both electrically connected to the controller 5. In use, the control box 4 is the control core of the device. The internal controller 5 coordinates the operation of each component. The touch screen display 6 on the control box 4 can intuitively display the equipment operating parameters and facilitate manual setting of operating commands. The controller 5 can realize the start and stop control of the high-pressure pump 211, monitor the equipment operating status in real time, and ensure the stable and efficient operation of the entire treatment device.

[0029] like Figure 1 and Figure 3 As shown, a check valve 7 is installed at the output end of the high-pressure pump 211, and a pressure sensor 8 is installed on the connecting pipe 204 corresponding to the wastewater inlet 208. The pressure sensor 8 is electrically connected to the controller 5. During use, the check valve 7 at the output end of the high-pressure pump 211 can prevent the backflow of pressurized wastewater, protecting the high-pressure pump 211 and the pipeline system. The pressure sensor 8 on the connecting pipe 204 of the wastewater inlet 208 detects the inlet water pressure in real time and transmits the pressure signal to the controller 5. If the pressure is abnormal, the controller 5 can issue an early warning or adjust the equipment operation in time to avoid high pressure damage to the reverse osmosis membrane.

[0030] like Figure 4 and Figure 5 As shown, a freshwater pipeline 9 is installed on the freshwater outlet 209, and an electric outlet valve 10 is installed on the freshwater pipeline 9. The electric outlet valve 10 is electrically connected to the controller 5. In use, the freshwater pipeline 9 on the freshwater outlet 209 is used to discharge the treated freshwater for subsequent recycling. The electric outlet valve 10 on the freshwater pipeline 9 is controlled by the controller 5 to start and stop. The outlet flow rate can be flexibly adjusted according to the freshwater production and demand to realize the orderly collection and transportation of freshwater.

[0031] like Figure 3 As shown, an electromagnetic flow meter 11 is installed on the conveying pipe 212. The electromagnetic flow meter 11 is electrically connected to the controller 5. During use, the electromagnetic flow meter 11 on the conveying pipe 212 detects the wastewater conveying flow rate in real time and transmits the flow data to the controller 5, so that the staff can keep track of the wastewater treatment volume. At the same time, the controller 5 can adjust the operating parameters of the high-pressure pump 211 according to the flow rate change to ensure the stable reverse osmosis concentration treatment effect.

[0032] like Figure 1As shown, an electric regulating valve 12 is installed on the discharge pipe 210. A connecting flange 13 is fixedly connected to the end of the discharge pipe 210 away from the reverse osmosis tank 1. The electric regulating valve 12 is electrically connected to the controller 5. In use, the electric regulating valve 12 on the discharge pipe 210 is controlled by the controller 5, which can flexibly adjust the concentrated water discharge flow rate and control the wastewater concentration. The connecting flange 13 at the end of the discharge pipe 210 is convenient for connecting to external concentrated water collection or subsequent treatment equipment, so as to realize the centralized treatment and disposal of concentrated water and avoid environmental pollution.

[0033] Working Principle: This utility model provides a multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater. The specific operating steps are as follows: The reverse osmosis component 2 uses the reverse osmosis tank 1 as the pressure-bearing shell. The high-pressure pump 211 provides high-pressure drive to the shale gas wastewater through the wastewater inlet 208. The wastewater enters the first-stage reverse osmosis membrane shell 202 through the connecting pipe 204. Under the action of pressure difference, water molecules pass through the high-pressure reverse osmosis membrane 203 to form fresh water, which is collected from the product water hole 207 and output as fresh water. Salts and pollutants are retained to form concentrated water, which enters the next-stage reverse osmosis membrane shell 202 through the concentrated water hole 206 for further treatment. The three membrane shells are connected in series through the connecting pipe 204 to achieve progressive concentration and deep separation. The concentrated water is finally collected through the final concentrated water hole 206 and discharged from the tank through the discharge pipe 210. This process is completed continuously under high pressure, achieving efficient desalination, fresh water recovery, and concentrated water concentration of shale gas wastewater (e.g., Figure 3 and Figure 5 As shown), the pretreatment component 3 uses the pretreatment tank 301 as the main treatment unit. Shale gas wastewater enters the tank through the top inlet 306. First, it passes through the grid filter 303 to intercept large suspended solids, silt, and flocculent impurities. Then, it passes through the quartz sand filter layer 304 to further remove fine suspended particles and colloids. Next, it passes through the activated carbon adsorption layer 305 to adsorb organic matter, color, and some dissolved pollutants in the wastewater. After three stages of progressive purification, the wastewater is discharged from the bottom outlet 302 and enters the high-pressure pump 211 through the conveying pipe 212. This provides water of the required quality for subsequent reverse osmosis treatment, reducing membrane fouling and system blockage, and ensuring the stable and efficient operation of the high-pressure reverse osmosis component 2 (e.g., Figure 4 (As shown).

[0034] All technical features in this embodiment can be freely combined according to actual needs.

[0035] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater, comprising a reverse osmosis tank (1), characterized in that, The reverse osmosis tank (1) is equipped with a reverse osmosis assembly (2), and the reverse osmosis assembly (2) is equipped with a pretreatment assembly (3). The reverse osmosis assembly (2) includes a mounting frame (201) fixedly connected inside the reverse osmosis tank (1). Three reverse osmosis membrane housings (202) are evenly arranged on the mounting frame (201). Each of the three reverse osmosis membrane housings (202) is equipped with a high-pressure reverse osmosis membrane (203). The three reverse osmosis membrane housings (202) are connected in series in multiple stages through connecting pipes (204). Each reverse osmosis membrane housing (202) has an inlet water hole (205) and a concentrate water hole (206) at its top and bottom, respectively. Each reverse osmosis membrane housing (202) has a product water hole (207) on its side wall. The top and bottom of the reverse osmosis tank (1) are respectively provided with a wastewater inlet (208) and a freshwater outlet (209). The inlet hole (205) of the first end of the reverse osmosis membrane shell (202) is connected to the wastewater inlet (208) through a connecting pipe (204). The concentrate hole (206) of the last end of the reverse osmosis membrane shell (202) is connected to a discharge pipe (210). The discharge pipe (210) penetrates the side wall of the reverse osmosis tank (1) and extends to the outside. A high-pressure pump (211) is installed on the wastewater inlet (208). The input end of the high-pressure pump (211) is connected to a delivery pipe (212).

2. The multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater according to claim 1, characterized in that, The pretreatment component (3) includes a pretreatment tank (301) installed at the end of the conveying pipe (212) away from the high-pressure pump (211). The bottom of the pretreatment tank (301) is provided with a discharge port (302). The conveying pipe (212) is connected to the discharge port (302). The inner wall of the pretreatment tank (301) is sequentially provided with a grid filter (303), a quartz sand filter layer (304), and an activated carbon adsorption layer (305). The top of the pretreatment tank (301) is provided with a feed inlet (306).

3. A multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater according to claim 1, characterized in that, A control box (4) is installed on the outer wall of the reverse osmosis tank (1). A controller (5) is installed inside the control box (4). A touch screen (6) is installed on the control box (4). The high-pressure pump (211) and the touch screen (6) are both electrically connected to the controller (5).

4. A multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater according to claim 1, characterized in that, The output end of the high-pressure pump (211) is equipped with a check valve (7), and the connecting pipe (204) corresponding to the wastewater inlet (208) is equipped with a pressure sensor (8), which is electrically connected to the controller (5).

5. A multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater according to claim 1, characterized in that, A freshwater pipeline (9) is installed on the freshwater outlet (209), and an electric water outlet valve (10) is installed on the freshwater pipeline (9). The electric water outlet valve (10) is electrically connected to the controller (5).

6. A multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater according to claim 1, characterized in that, An electromagnetic flowmeter (11) is installed on the delivery pipe (212), and the electromagnetic flowmeter (11) is electrically connected to the controller (5).

7. A multi-stage high-pressure reverse osmosis concentration treatment device for shale gas wastewater according to claim 1, characterized in that, An electric regulating valve (12) is installed on the discharge pipe (210). A connecting flange (13) is fixedly connected to the end of the discharge pipe (210) away from the reverse osmosis tank (1). The electric regulating valve (12) is electrically connected to the controller (5).

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