Reverse osmosis concentrated water sewage treatment system and treatment method thereof

Abstract

The invention discloses a reverse osmosis concentrated water sewage treatment system, belongs to the technical field of sewage treatment, and uses a pressure delay osmosis power generation device to dilute reverse osmosis concentrated water and generate power. In the vertical direction, the permeation cavities of the concentrated water chamber and the fresh water chamber are located on the upper side and the lower side of the semi-permeable membrane respectively, one end of a liquid supplementing cavity of the fresh water chamber communicates with the permeation cavities, and the other end extends upwards and is higher than the semi-permeable membrane. The controller obtains the permeation flow of the semi-permeable membrane according to the volume variation of fresh water in the fresh water chamber in unit time, generates a control instruction according to the permeation flow, and adjusts the feeding flow of the feeding pipeline so as to reduce the fluctuation of the sum of the permeation flow and the feeding flow. Compared with the prior art, the salt difference energy of the reverse osmosis concentrated water can be converted into electric energy to be stored, the dilution effect can be guaranteed, and the power generation quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, and more specifically, to a reverse osmosis concentrate wastewater treatment system and treatment method thereof. Background Technology

[0002] Compared to other wastewater, municipal sewage and some food processing wastewater have higher concentrations of nitrogen and phosphorus salts. Wastewater treatment typically includes a reverse osmosis process. Reverse osmosis is a technology that uses high pressure to force water molecules through a semi-permeable membrane, discharging a large amount of recycled water that has passed through the membrane. However, this process inevitably produces a high-salt-concentration retained liquid (reverse osmosis concentrate, wastewater with excessively high salt content that cannot be directly discharged). To better utilize the chemical energy in reverse osmosis concentrate and achieve waste utilization, existing technologies, such as the reverse osmosis concentrate treatment system disclosed in CN113060839B, directly use the diluted reverse osmosis concentrate as a biological culture medium. This allows the synthesis of biomass using the nitrogen and phosphorus salts (ammonium salts, nitrates, phosphates) in the concentrate. The resulting algae can be used as raw materials for biodiesel, functional foods, feed, and biofuels. However, this treatment system directly dilutes the reverse osmosis concentrate with water, failing to convert the salinity gradient energy of the collected concentrate, resulting in low energy output from the concentrate.

[0003] Therefore, how to convert and collect salinity gradient energy during the dilution process has become a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a reverse osmosis concentrate wastewater treatment system and treatment method to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A reverse osmosis concentrate wastewater treatment system, the system being a device for treating reverse osmosis concentrate wastewater and generating electricity from the reverse osmosis concentrate during the treatment process, the system comprising an osmosis dilution device and a biological treatment unit, the osmosis dilution device comprising a pressure-delayed osmosis power generation device and a controller; The pressure delayed osmosis power generation device includes a feed drive device, a dialysis tank, and a power generation device. A semi-permeable membrane is horizontally installed in the dialysis tank to divide the dialysis tank into a concentrate chamber and a desalination chamber. The semi-permeable membrane is used to retain salt through water. The concentrate chamber has an inlet and an outlet for installing a feed pipe and a discharge pipe. The feed pipe is equipped with a feed drive device to drive reverse osmosis concentrate into the concentrate chamber. The discharge pipe is connected to an open container of the biological treatment unit. A rotor is installed in the discharge pipe. The shaft of the rotor is coaxially connected to the shaft of the power generation device outside the tank. Liquid in the concentrate chamber is discharged from the discharge pipe, driving the rotor to rotate, which in turn drives the shaft of the power generation device to rotate, thereby generating electricity. The freshwater chamber includes a connected permeation chamber and a replenishment chamber. In the vertical direction, the concentrate chamber and the permeation chamber are located on the upper and lower sides of the semipermeable membrane, respectively. One end of the replenishment chamber is connected to the permeation chamber, and the other end extends upward and is higher than the semipermeable membrane. The freshwater chamber is equipped with a monitoring device to monitor the volume change of freshwater in the chamber per unit time. The monitoring device and the feeding drive device are both electrically connected to the controller. The controller obtains the permeation flow rate of the semipermeable membrane based on the volume change of freshwater in the chamber per unit time, and generates a control command based on the permeation flow rate to adjust the feed flow rate of the feed pipe, so as to reduce the fluctuation of the sum of the permeation flow rate and the feed flow rate.

[0006] Optionally, the outlet is located near the semipermeable membrane.

[0007] Optionally, the monitoring device is a liquid level detector, used to measure the liquid level height in the replenishment chamber and generate liquid level change data of the replenishment chamber per unit time. The controller can calculate the volume change of fresh water in the replenishment chamber per unit time based on the liquid level change data.

[0008] Optionally, the liquid level detector is an ultrasonic liquid level gauge.

[0009] Optionally, the liquid level detector is a hydrostatic level gauge, with the pressure measuring position located underwater and close to the bottom of the replenishment chamber. The controller obtains the underwater depth change of its pressure measuring position per unit time based on the hydrostatic pressure change data measured per unit time, and obtains the liquid level change data of the replenishment chamber per unit time accordingly.

[0010] Optionally, the feeding drive device is a variable speed centrifugal pump, and a flow meter is also provided in the feeding pipeline to measure the feeding flow rate. The flow meter is electrically connected to the controller. The controller calculates the target feeding flow rate in real time based on the semipermeable membrane permeation flow rate to reduce the fluctuation of the sum of the semipermeable membrane permeation flow rate and the feeding flow rate. It also calculates the target rotational speed based on the target feeding flow rate, the real-time measured flow data, and the real-time rotational speed of the variable speed centrifugal pump, generates a rotational speed control command, and adjusts the rotational speed of the variable speed centrifugal pump to change the feeding flow rate.

[0011] Optionally, the controller generates control commands based on the permeation flow rate of the semipermeable membrane to adjust the feed flow rate of the feed pipe so that the sum of the permeation flow rate and the feed flow rate is constant.

[0012] Optionally, the inner wall of the top of the concentrate chamber is provided with an adjusting component for adjusting the height of the concentrate chamber and changing its volume.

[0013] According to another aspect of this application, a method for treating reverse osmosis concentrate wastewater is provided, which utilizes the aforementioned reverse osmosis concentrate wastewater treatment system to treat reverse osmosis concentrate.

[0014] Compared to existing technologies, this invention can convert the salinity gradient of reverse osmosis concentrate into electrical energy for storage during the dilution process. Furthermore, this application uses permeate flow rate to reflect the concentration and osmotic pressure fluctuations of the feed concentrate. An increase in permeate flow rate indicates a higher concentration and osmotic pressure, requiring slow feeding for thorough dilution to ensure effective dilution. This application also reduces fluctuations in the sum of feed flow rate and permeate flow rate by regulating the feed flow rate. This results in smaller fluctuations in the influent volume to the concentrate chamber, a more stable outflow from the outlet, and controlled rotor speed and temperature, thus ensuring high-quality power generation. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the structure of a reverse osmosis concentrate wastewater treatment system provided in an embodiment of this application; Figure 2 for Figure 1 A partial enlarged view of the embodiment.

[0016] Reference numerals: dialysis tank 100, concentrate chamber 110, feed pipe 111, feed drive device 112, flow meter 113, discharge pipe 114, impeller 115, desalination chamber 120, permeation chamber 121, replenishment chamber 122, hydrostatic level gauge 123, ultrasonic level gauge 124, semi-permeable membrane 130, first drive device 140, drive shaft of the first drive device 141, sealing ring 142, controller 150, power generation equipment 160, open container 210, stirrer 211, conductivity meter 212, temperature sensor 213, pH meter 214, incineration equipment 300. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] See Figures 1 to 2 As shown, the present invention provides a reverse osmosis concentrate wastewater treatment system. The system is a device for treating reverse osmosis concentrate wastewater and generating electricity from the reverse osmosis concentrate during the treatment process. The system includes a percolation dilution device and a biological treatment unit. The percolation dilution device includes a pressure-delayed percolation power generation device and a controller 150. The pressure delayed osmosis power generation device includes a feed drive device 112, a dialysis tank 100, and a power generation device 160. A semi-permeable membrane 130 is horizontally installed in the dialysis tank 100 to divide the dialysis tank 100 into a concentrate chamber 110 and a desalination chamber 120. The semi-permeable membrane 130 is used to retain salt through water. The concentrate chamber 110 has an inlet and an outlet for installing a feed pipe 111 and a discharge pipe 114. The feed pipe 111 is equipped with a feed drive device 112 to drive reverse osmosis concentrate into the concentrate chamber 110. The discharge pipe 114 is connected to the open container 210 of the biological treatment unit. A rotor 115 is installed in the discharge pipe 114. The shaft of the rotor 115 is coaxially connected to the shaft of the power generation device 160 outside the tank. The liquid in the concentrate chamber 110 is discharged from the discharge pipe 114, driving the rotor 115 to rotate, which in turn drives the shaft of the power generation device 160 to rotate, thereby generating electricity. The freshwater chamber 120 includes a permeation chamber 121 and a replenishment chamber 122 that are connected. In the vertical direction, the concentrate chamber 110 and the permeation chamber 121 are located on the upper and lower sides of the semipermeable membrane 130, respectively. One end of the replenishment chamber 122 is connected to the permeation chamber 121, and the other end extends upward and is higher than the semipermeable membrane 130, so that the liquid level in the replenishment chamber 122 is higher than that in the semipermeable membrane 130, thereby replenishing the permeation chamber 121 with freshwater. The freshwater chamber 120 is equipped with a monitoring device to monitor the rate of change of the volume of freshwater within the chamber (ΔV1 / Δt, where ΔV1 = V). t -V （t-1） V t For the volume of freshwater at this time, V （t-1） The monitoring device and the feed drive device 112 are both electrically connected to the controller 150. The controller 150 obtains the permeation flow rate Q1 of the semipermeable membrane 130 based on the volume change rate of the fresh water (ΔV1 / Δt), and generates a control command based on the permeation flow rate Q1 of the semipermeable membrane 130 to adjust the feed flow rate Q2 of the feed pipe 111 in order to reduce the fluctuation of the sum of the permeation flow rate Q1 and the feed flow rate Q2 (Q1+Q2).

[0019] Compared to existing technologies, this invention can convert the salinity gradient of reverse osmosis concentrate into electrical energy for storage during the dilution process. Furthermore, this application uses permeate flow rate to reflect the concentration and osmotic pressure fluctuations of the feed concentrate. An increase in permeate flow rate indicates a higher concentration and osmotic pressure, requiring slow feeding for thorough dilution to ensure effective dilution. This application also reduces fluctuations in the sum of feed flow rate and permeate flow rate by regulating the feed flow rate. This results in smaller fluctuations in the influent flow rate to the concentrate chamber 110, a more stable outflow from the outlet, and controlled rotational speed and temperature of the rotor 115, thus ensuring high-quality power generation.

[0020] Optionally, the outlet is close to the semipermeable membrane 130, and the inlet is far from the semipermeable membrane 130.

[0021] In one possible implementation, the monitoring device is a liquid level detector used to measure the liquid level height in the replenishment chamber 122 and generate data on the change in liquid level height in the replenishment chamber 122 per unit time (Δh1 / Δt). The controller 150 can calculate the volume change of fresh water in the replenishment chamber 122 per unit time (ΔV1 / Δt) based on the change in liquid level height (Δh1 / Δt), and this volume change is the liquid loss Q. 流失 .

[0022] The controller 150 calculates the volume change of fresh water in the replenishment chamber 122 based on the change in liquid level height, provided that the initial liquid level is known, the three-dimensional structure of the replenishment chamber 122 is known and regular, and the corresponding liquid loss Q can be calculated based on the drop in liquid level height per unit time. 流失 The initial liquid level is known, and the rate of change in liquid level height is detected. The liquid level height at the previous detection cycle time point and the current liquid level height are both known, allowing the calculation of the volume of the area formed by the liquid level drop (originally filled, now empty). The replenishment chamber 122 can be a cuboid tank or other cylindrical structure (cylindrical means the cross-sectional area remains constant; it can be a cylinder or a polygonal prism), where ΔV1 / Δt = |Δh1 / Δt| * cross-sectional area. Alternatively, it can be any other shape from which the volume can be calculated using the height formula.

[0023] During normal operation, the liquid has no outflow path other than the semipermeable membrane 130. The amount of liquid loss Q 流失 For Q1, the replenishment chamber 122 has been fully filled with sufficient fresh water before operation, and the liquid level will not rise during normal operation. The system can be shut down, fresh water added, and a new initial liquid level input entered to restart. Alternatively, without shutting down, the controller 150 can be used to determine if the liquid level rises (Δh1 / Δt > 0). If so, liquid level monitoring will be immediately activated, and the measured liquid level will be used as the new initial liquid level; subsequent levels will proceed sequentially.

[0024] Optionally, the level detector is a hydrostatic level gauge 123. The hydrostatic level gauge 123 is preferably a high-frequency (pressure measurement interval in milliseconds, 30 to 500 milliseconds) monitoring level gauge. The hydrostatic level gauge 123 includes an underwater pressure sensor fixedly installed on the wall of the replenishment chamber 122. The pressure data measured by the sensor is the hydrostatic pressure data at the measurement point. Based on the hydrostatic pressure change data, the pressure drop rate (the amount of pressure decrease per unit time) is calculated. The hydrostatic level gauge 123 uses an intermittent acquisition mode, and the obtained pressure drop rate is the average pressure change rate ΔP / Δt. Then, the change in underwater depth of the hydrostatic level gauge 123 (measuring probe) per unit time (Δh2 / Δt, Δh2=ΔP / ρg) is calculated as the change in liquid level height in the replenishment chamber 122 per unit time (Δh1 / Δt). Given the initial liquid level, the controller 150 can calculate the liquid loss Q corresponding to the drop in liquid level (the change in liquid level height in the replenishment chamber 122 per unit time, Δh1 / Δt). 流失 As Q1.

[0025] In one possible implementation, the liquid level detector is an ultrasonic liquid level meter 124, which detects the liquid level in a non-contact, high-frequency, intermittent manner to obtain the change in the liquid level height of the replenishment chamber 122 per unit time (Δh1 / Δt).

[0026] In one possible implementation, the feed drive device 112 is a variable speed centrifugal pump, and a flow meter 113 is also provided in the feed pipe 111 to measure the feed flow rate Q2. The flow meter 113 is electrically connected to the controller 150. The controller 150 calculates the target feed flow rate B in real time based on the permeation flow rate Q1 of the semipermeable membrane 130 to reduce the fluctuation of the sum of the permeation flow rate Q1 of the semipermeable membrane 130 and the feed flow rate Q2 (preferably to keep Q1+Q2 constant, B=A-Q1). Based on the target feed flow rate B, the real-time measured flow data Q2, and the real-time speed n1 of the variable speed centrifugal pump, the controller calculates the target speed n2 and generates a speed control command (B / Q2=n2 / n1) to adjust the speed of the variable speed centrifugal pump to n2, thereby changing the feed flow rate to B.

[0027] In one possible implementation, the controller 150 generates a control command based on the permeation flow rate Q1 of the semipermeable membrane 130, adjusting the feed flow rate Q2 of the feed pipe 111 to keep the sum of the permeation flow rate Q1 and the feed flow rate Q2 constant, which is the target discharge flow rate A of the impeller 115 (Q1 + Q2 = A, A remains constant). Ideally, Q1 + Q2 is approximately equal to the discharge flow rate Q3 of the impeller 115. The discharge flow rate Q3 of the impeller 115 is positively correlated with the rotational speed of the impeller 115. Keeping the discharge flow rate Q3 of the impeller 115 constant can reduce the fluctuation of the rotational speed of the impeller 115 and the power generation equipment 160 shaft, ensuring the quality of power generation. The value of A can be flexibly set and optimized according to the situation of the power generation equipment 160.

[0028] In one possible implementation, the inner wall of the top of the concentrate chamber 110 is provided with an adjusting member for adjusting the height of the concentrate chamber 110, thereby changing the ratio of the volume of the concentrate chamber 110 to the area of ​​the semipermeable membrane 130. Vertically, the bottom of the concentrate chamber 110 has an opening for installing the semipermeable membrane 130, and one end of the top has an opening for inserting a sealing member. This application changes the volume of the concentrate chamber 110 by replacing sealing members of different heights or adjusting the height (extension) of the sealing member; the outer edge of the bottom of the sealing member is always in contact with and sealed against the top wall of the concentrate chamber 110. Alternatively, a first driving device 140 is installed on the outer side of the top, with its driving shaft 141 penetrating the top space inside the concentrate chamber 110. There is a sliding space between the driving shaft 141 and the through hole for linear extension and retraction of the driving shaft 141. The outer edge of the bottom of the driving shaft 141 matches the top space of the concentrate chamber 110, and a sealing ring 142 is provided on the outer edge of the bottom of the driving shaft 141, ensuring constant contact and sealing against the top wall of the concentrate chamber 110. The first drive unit 140 drives its drive shaft 141 to move linearly and lock it in a preset position. The linear movement direction of the drive shaft 141 is vertical. Optionally, the concentrate chamber 110 is cuboid in shape, and the sealing ring 142 is a square ring. Figure 1 In this example, the drive shaft has moved downwards to its limit (the system must always maintain the feeding capacity of the feed pipe), and the concentrate chamber volume has been adjusted to its minimum. It can be moved upwards along the arrow direction.

[0029] According to another aspect of this application, a method for treating reverse osmosis concentrate wastewater using the aforementioned reverse osmosis concentrate wastewater treatment system is provided, comprising the following steps: The reverse osmosis concentrate is continuously pumped into the concentrate chamber 110 by the feed drive device 112; The liquid in the concentrate chamber 110 flows out from the outlet pipe 114 into the open container 210 of the biological treatment unit, driving the rotor 115 to rotate and generate electricity. After dilution, adjust the pH of the liquid in the open container 210 to the preset range, and then plant and cultivate algae in the liquid; Collect the algae and dry the remaining liquid into a solid. Solid products obtained from landfilling or incineration.

[0030] Alternatively, a biological treatment unit, such as CN113060839B, can be used, or microalgae can be directly inoculated into the solution in the open container 210. The former does not require aeration, while the latter requires an aeration device to aerate the liquid in the open container 210 by pumping air in. Oxygen is provided at night, and carbon dioxide is provided during the day.

[0031] During cultivation, if excessive algal growth occurs, some or all algae can be collected, and the cultivation of a new batch of algae can be stopped. A conductivity meter 212 is installed inside the open container 210, positioned near the bottom, to monitor the liquid conductivity in real time. A temperature sensor 213 is also provided to measure temperature in real time and assist in calibrating the conductivity data. If the conductivity meter 212 reading is higher than a threshold (which can be determined by the conductivity meter 212 itself or by the controller 150 connected to the conductivity meter 212), an alarm element in the biological unit is triggered. Water is then added until the conductivity falls below the threshold again, and the pH is adjusted (by lifting the hydrophilic material and stirring, inserting the stirring element, or activating the stirrer 211 at the bottom of the container to evenly disperse the pH adjuster in the liquid; a preset gap exists between the stirrer 211 and the hydrophilic material and algae to avoid cutting them off). A pH meter 214 is also installed inside the open container 210, located at the bottom, to monitor the liquid pH value in real time. If the pH is abnormal, pH adjuster is manually added and the container is stirred. If algal growth is slow, and after pH and conductivity return to normal, replacing with a new batch of algae still results in slow growth, sample and measure nitrogen and phosphorus content to determine whether to terminate the culture. If both nitrogen and phosphorus content are low, stop the culture. If one is high and the other is low, determine whether to add supplements or terminate the culture as needed.

[0032] Optionally, the drying method is open natural evaporation until dry. The resulting solid is mainly biodegradable organic matter. Preferably, the aforementioned system also includes an incineration device 300 for high-temperature incineration of the resulting solid.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reverse osmosis concentrate wastewater treatment system, characterized in that... The system is a device for treating reverse osmosis concentrate, a type of wastewater, and generating electricity from the reverse osmosis concentrate during the treatment process. The system includes a osmosis dilution device and a biological treatment unit. The osmosis dilution device includes a pressure-delayed osmosis power generation device and a controller. The pressure delayed osmosis power generation device includes a feed drive device, a dialysis tank, and a power generation device. A semi-permeable membrane is horizontally installed in the dialysis tank to divide the dialysis tank into a concentrate chamber and a desalination chamber. The semi-permeable membrane is used to retain salt through water. The concentrate chamber has an inlet and an outlet for installing a feed pipe and a discharge pipe. The feed pipe is equipped with a feed drive device to drive reverse osmosis concentrate into the concentrate chamber. The discharge pipe is connected to an open container of the biological treatment unit. A rotor is installed in the discharge pipe. The shaft of the rotor is coaxially connected to the shaft of the power generation device outside the tank. Liquid in the concentrate chamber is discharged from the discharge pipe, driving the rotor to rotate, which in turn drives the shaft of the power generation device to rotate, thereby generating electricity. The freshwater chamber includes a connected permeation chamber and a replenishment chamber. In the vertical direction, the concentrate chamber and the permeation chamber are located on the upper and lower sides of the semipermeable membrane, respectively. One end of the replenishment chamber is connected to the permeation chamber, and the other end extends upward and is higher than the semipermeable membrane. The freshwater chamber is equipped with a monitoring device to monitor the volume change of freshwater in the chamber per unit time. The monitoring device and the feeding drive device are both electrically connected to the controller. The controller obtains the permeation flow rate of the semipermeable membrane based on the volume change of freshwater in the chamber per unit time, and generates a control command based on the permeation flow rate to adjust the feed flow rate of the feed pipe, so as to reduce the fluctuation of the sum of the permeation flow rate and the feed flow rate.

2. The reverse osmosis concentrate wastewater treatment system according to claim 1, characterized in that, The outlet is located near the semi-permeable membrane.

3. The reverse osmosis concentrate wastewater treatment system according to claim 1, characterized in that, The monitoring device is a liquid level detector, used to measure the liquid level height in the replenishment chamber and generate liquid level change data of the replenishment chamber per unit time. The controller can calculate the volume change of fresh water in the replenishment chamber per unit time based on the liquid level change data.

4. The reverse osmosis concentrate wastewater treatment system according to claim 3, characterized in that, The liquid level detector is an ultrasonic liquid level gauge.

5. The reverse osmosis concentrate wastewater treatment system according to claim 3, characterized in that, The liquid level detector is a hydrostatic level gauge. The pressure measuring position is located underwater and close to the bottom of the replenishment chamber. The controller obtains the underwater depth change of the pressure measuring position per unit time based on the hydrostatic pressure change data measured per unit time, and obtains the liquid level change data of the replenishment chamber per unit time accordingly.

6. The reverse osmosis concentrate wastewater treatment system according to claim 1, characterized in that, The feeding drive device is a variable speed centrifugal pump. A flow meter is also installed in the feeding pipeline to measure the feeding flow rate. The flow meter is electrically connected to the controller. The controller calculates the target feeding flow rate in real time based on the semipermeable membrane permeation flow rate to reduce the fluctuation of the sum of the semipermeable membrane permeation flow rate and the feeding flow rate. Based on the target feeding flow rate, the real-time measured flow data, and the real-time speed of the variable speed centrifugal pump, the controller calculates the target speed and generates a speed control command to adjust the speed of the variable speed centrifugal pump, thereby changing the feeding flow rate.

7. The reverse osmosis concentrate wastewater treatment system according to claim 1, characterized in that, The controller generates control commands based on the permeation flow rate of the semipermeable membrane to adjust the feed flow rate of the feed pipe so that the sum of the permeation flow rate and the feed flow rate remains constant.

8. The reverse osmosis concentrate wastewater treatment system according to claim 1, characterized in that, The inner wall of the top of the concentrate chamber is equipped with an adjustment component for adjusting the height of the concentrate chamber and changing its volume.

9. A method for treating reverse osmosis concentrate wastewater, characterized in that, The reverse osmosis concentrate wastewater treatment system according to any one of claims 1-8 is used to treat reverse osmosis concentrate.

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