A reverse osmosis product water treatment device

Abstract

The utility model discloses a kind of reverse osmosis water production treatment devices, including blow-off tower, reverse osmosis unit and fan, the blow-off tower is equipped with filler layer, the upper portion of the filler layer is equipped with water distribution pipe, the reverse osmosis unit is communicated with water distribution pipe, the blow-off tower is below filler layer and is equipped with air inlet, is equipped with exhaust port above filler layer, the fan is connected with air inlet, the bottom of the blow-off tower is equipped with water storage tank, the water storage tank is equipped with drain on top. The reverse osmosis water production treatment device of the utility model has the advantages of low cost, good stability and good safety.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a reverse osmosis permeate treatment device. Background Technology

[0002] Reverse osmosis is often used as a terminal deep treatment system in wastewater treatment. Because reverse osmosis has a high rejection rate for pollutants (COD, total nitrogen, chloride ions, ammonia nitrogen, etc.) in the effluent of MBR biological treatment, all its effluent indicators meet the limit requirements in the "Standard for Pollutant Control of Municipal Solid Waste Landfill" (GB 16889-2024). However, under normal circumstances, the pH of the permeate after high-pressure reverse osmosis treatment will decrease, and the effluent pH is generally 5~5.8, which cannot meet the requirement of 6~9 in the "Integrated Wastewater Discharge Standard" (GB 8978-1996). Therefore, wastewater treatment plants that use reverse osmosis as the treatment terminal need to adjust the pH of the reverse osmosis permeate to meet the discharge standard requirements.

[0003] To ensure that the pH of reverse osmosis permeate meets national standards, liquid alkali is generally added to adjust the pH of the permeate feed water. However, liquid alkali addition is costly and poses safety risks. Furthermore, due to the high pH of the liquid alkali, the pH of the permeate fluctuates excessively after addition, making it difficult to adjust. It is also susceptible to external factors (clarified liquid flow rate, permeate alkalinity, liquid alkali concentration, etc.) and lacks stability, easily leading to a pH exceeding 9 in the effluent. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a reverse osmosis permeate treatment device with low cost, good stability and good safety.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A reverse osmosis permeate treatment device includes a stripping tower, a reverse osmosis unit, and a blower. The stripping tower has a packing layer inside, and a water distribution pipe is provided above the packing layer. The reverse osmosis unit is connected to the water distribution pipe. The stripping tower has an air inlet below the packing layer and an exhaust outlet above the packing layer. The blower is connected to the air inlet. A water storage tank is provided at the bottom of the stripping tower, and a drain outlet is provided on the water storage tank.

[0006] As a further improvement to the above technical solution: The water distribution pipe is equipped with a water inlet flow meter, and the air inlet flow meter is installed between the blower and the air inlet. The blower is connected to both the water inlet flow meter and the air inlet flow meter, and the frequency of the blower is adjusted to make Q... 风 satisfy , where Q 水 Q is the flow rate detected by the inlet flow meter. 风The flow rate measured by the air inlet flow meter is k, where k is the air-to-water ratio.

[0007] The water storage tank is equipped with a pH sensor. When the pH value detected by the pH sensor is lower than the lower pH limit, the frequency of the fan is adjusted so that Q... 风 satisfy .

[0008] The water storage tank is also equipped with a circulation port, which is connected to the water distribution pipe via a circulation pump.

[0009] The pH sensor is connected to the circulating pump. When the fan (3) is at Q 风 satisfy Under certain conditions, if the pH value detected by the pH sensor is still lower than the lower limit of pH after a running time t, the circulation pump will start.

[0010] When the pH value detected by the pH sensor is higher than the upper limit of pH, the frequency of the fan is adjusted so that Q 风 satisfy .

[0011] The lower pH limit is 7.0, and the upper pH limit is 8.5.

[0012] The k 下限 The value is 25, and the k is... 上限 It is 60.

[0013] The exhaust port is located at the top of the stripping tower, and a water vapor collection plate is provided above the exhaust port.

[0014] The fan is a centrifugal fan, and the rated air volume of the fan is 100 times the upper limit of the water treatment flow rate of the reverse osmosis permeate treatment device.

[0015] Compared with the prior art, the advantages of this utility model are: 1. The reverse osmosis permeate treatment device of this utility model adjusts the pH of the reverse osmosis permeate by removing carbon dioxide from the water using air stripping. The main costs are power consumption and packing material replacement costs, which are lower than the treatment cost of general chemical adjustment methods. It can make full use of the residual pressure of the reverse osmosis unit to transport the reverse osmosis permeate, resulting in low power consumption. The degree of stripping of the reverse osmosis permeate can be adjusted by adjusting the air volume of the blower, that is, adjusting the pH rise of the reverse osmosis permeate after each pass through the packing layer. The pH value is easy to adjust and has good stability. Furthermore, since only air stripping is used, the addition of hazardous chemicals such as liquid alkali is avoided, resulting in good safety.

[0016] 2. The reverse osmosis permeate treatment device of this utility model, through Q 风 Size and Q 水Matching the air intake flow rate with the water intake flow rate ensures the scavenging effect and prevents excessive pH fluctuations when the water intake flow rate changes, resulting in better stability.

[0017] 3. In the reverse osmosis permeate treatment device of this utility model, when the pH value detected by the pH sensor is lower than the lower pH limit, it indicates that the pH value of the reverse osmosis permeate is still too low after stripping. The pH value can be adjusted by changing the frequency of the blower to meet the pH requirement. This increases the pH rise of the reverse osmosis permeate after each pass through the packing layer, thereby increasing the pH value of the reverse osmosis permeate in the storage tank.

[0018] 4. In the reverse osmosis permeate treatment device of this utility model, when the pH value of the reverse osmosis permeate in the storage tank is too low, and the pH value still cannot be brought to the normal range by increasing the frequency of the blower, the circulation pump is started to circulate and blow away the reverse osmosis permeate in the storage tank, so as to further increase the pH value of the reverse osmosis permeate. The adjustment of the blower frequency and the start of the circulation pump for circulation and blowing work together to enhance the pH value adjustment effect, so that the pH value of the reverse osmosis permeate in the storage tank meets the discharge requirements.

[0019] 5. The reverse osmosis permeate treatment device of this utility model, by setting a time t, can first increase the pH value by adjusting the frequency of the blower. If the blower meets the requirements... If, after running for t under certain conditions, the pH value detected by the pH sensor is still lower than the lower limit of pH, it means that relying solely on the fan cannot meet the emission requirements for pH. Then, the circulation pump is started to prevent frequent starts of the circulation pump and avoid excessive fluctuations in pH value.

[0020] 6. In the reverse osmosis permeate treatment device of this utility model, when the pH value detected by the pH sensor is higher than the upper limit of pH, it indicates that the pH value of the reverse osmosis permeate after stripping is too high. The pH value can be adjusted by changing the frequency of the blower to meet the pH requirement. This reduces the pH rise of the reverse osmosis permeate after each pass through the packing layer, thereby lowering the pH value of the reverse osmosis permeate in the storage tank.

[0021] 7. In the reverse osmosis permeate treatment device of this utility model, when the gas-to-water ratio is too low, the pH increase is too small, and the pH value still cannot meet the discharge requirements after stripping; when the gas-to-water ratio is too high, the increase rate of pH value is too small, but the power consumption of the blower increases significantly. Therefore, maintaining the gas-to-water ratio at k 下限 and k 上限 Within a certain range, it can balance the increasing demand for pH value and the cost of electricity consumption. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the reverse osmosis permeate treatment device of this utility model.

[0023] Figure 2 This is a graph showing the pH increase and air-to-water ratio trend of the reverse osmosis permeate treatment device of this utility model.

[0024] Legend: 1. Stripping tower; 11. Packing layer; 12. Water distribution pipe; 13. Water storage tank; 14. Drain outlet; 15. Water vapor collection plate; 2. Reverse osmosis unit; 3. Fan; 4. Circulation pump; 5. pH sensor; 61. Inlet water flow meter; 62. Inlet air flow meter. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] like Figure 1As shown, the reverse osmosis permeate treatment device of this embodiment includes a stripping tower 1, a reverse osmosis unit 2, and a blower 3. The stripping tower 1 is provided with a packing layer 11, and a water distribution pipe 12 is provided above the packing layer 11. The reverse osmosis unit 2 is connected to the water distribution pipe 12. The stripping tower 1 has an air inlet below the packing layer 11 and an exhaust outlet above the packing layer 11. The blower 3 is connected to the air inlet. A water storage tank 13 is provided at the bottom of the stripping tower 1, and a drain outlet 14 is provided on the water storage tank 13.

[0030] In this embodiment of the reverse osmosis permeate treatment device, when the landfill leachate is treated by reverse osmosis unit 2, the resulting reverse osmosis permeate is pumped into water distribution pipe 12 by the residual pressure pump of reverse osmosis unit 2. The reverse osmosis permeate enters the packing layer 11 from top to bottom through the water distribution pipe 12. The blower 3 draws air and blows it into the stripping tower 1, entering the packing layer 11 from bottom to top. The reverse osmosis permeate and air come into contact in the packing layer 11. Carbon dioxide in the water is released, and the air carries away the carbon dioxide in the water from bottom to top and discharges it through the exhaust port. The reverse osmosis permeate, whose carbon dioxide concentration has been reduced by stripping in the packing layer 11, falls and collects in the water storage tank 13 at the bottom of the stripping tower 1, and is then discharged from the drain outlet 14 of the stripping tower 1.

[0031] The reverse osmosis permeate treatment device in this embodiment adjusts the pH of the reverse osmosis permeate by removing carbon dioxide from the water using air stripping. The main costs are power consumption and packing material replacement costs, which is lower than the treatment cost of general chemical adjustment methods. It can make full use of the residual pressure of the permeate from the reverse osmosis unit 2 to transport the reverse osmosis permeate, resulting in low power consumption. The degree of stripping of the reverse osmosis permeate can be adjusted by adjusting the air volume of the blower 3, that is, adjusting the pH rise of the reverse osmosis permeate after each passage through the packing layer 11. The pH value is easy to adjust and has good stability. Furthermore, since only air stripping is used, the addition of hazardous chemicals such as liquid alkali is avoided, resulting in good safety.

[0032] Furthermore, in this embodiment, a water inlet flow meter 61 is provided on the water distribution pipe 12, and an air inlet flow meter 62 is provided between the fan 3 and the air inlet. The fan 3 is connected to both the water inlet flow meter 61 and the air inlet flow meter 62. By adjusting the frequency of the fan 3, Q... 风 satisfy , where Q 水 Q is the flow rate detected by the inlet flow meter 61. 风 The flow rate detected by the inlet air flow meter is 62, and k is the air-to-water ratio. This is achieved by using Q... 风 Size and Q 水 Matching the air intake flow rate with the water intake flow rate ensures the scavenging effect and prevents excessive pH fluctuations when the water intake flow rate changes, resulting in better stability.

[0033] Preferably, in this embodiment, the fan 3 is connected to the inlet water flow meter 61 and the inlet air flow meter 62 through a controller (such as a PLC, a small relay module, etc.). The controller can automatically adjust the frequency of the fan 3 according to the detection values ​​of the inlet water flow meter 61 and the inlet air flow meter 62 to adjust the inlet air flow, which has a high degree of automation.

[0034] Furthermore, in this embodiment, a pH sensor 5 is installed inside the water storage tank 13. When the pH value detected by the pH sensor 5 is lower than the lower pH limit, the frequency of the fan 3 is adjusted so that Q... 风 satisfy When the pH value detected by pH sensor 5 is lower than the lower pH limit, it indicates that the pH value of the reverse osmosis permeate is still too low after stripping. The pH value can be adjusted by changing the frequency of blower 3 to meet the pH requirement. This increases the pH value of the reverse osmosis permeate after each pass through the packing layer 11, thereby increasing the pH value of the reverse osmosis permeate in the storage tank 13.

[0035] Furthermore, in this embodiment, the water storage tank 13 is also provided with a circulation port, which is connected to the water distribution pipe 12 via a circulation pump 4. When the pH value of the reverse osmosis permeate in the water storage tank 13 is too low, and increasing the frequency of the blower 3 still fails to bring the pH value to the normal range, the circulation pump is started to circulate and blow away the reverse osmosis permeate in the water storage tank 13, thereby further increasing the pH value of the reverse osmosis permeate. Adjusting the frequency of the blower 3 and starting the circulation pump 4 for circulation and blowing work together to enhance the pH adjustment effect, so that the pH value of the reverse osmosis permeate in the water storage tank 13 meets the discharge requirements.

[0036] Furthermore, in this embodiment, the pH detection element 5 is connected to the circulating pump 4, and when the fan 3 meets the requirements... Under certain conditions, if the pH value detected by pH sensor 5 is still below the lower pH limit after the operating time reaches t, the circulation pump 4 will start. By setting time t, the pH value can be increased first by adjusting the frequency of fan 3. If fan 3 meets the requirements... Under the specified conditions, after the operating time reaches t, if the pH value of the pH sensor 5 is still lower than the lower pH limit, it indicates that relying solely on the fan 3 cannot achieve the required pH value for emissions. Then, the circulation pump 4 is started to prevent frequent starts and excessive pH fluctuations. Here, t is 300s. Of course, in other embodiments, the length of t can be adjusted according to actual conditions.

[0037] Preferably, in this embodiment, when the pH value detected by the pH sensor 5 is higher than the upper limit of pH, the circulation pump 4 is turned off to prevent the pH value from becoming too high. The circulation pump 4 is connected to the pH sensor 5 through a controller (such as a PLC, a small relay module, etc.), and the circulation pump 4 can automatically start and stop according to the detection value of the pH sensor 5, with a high degree of automation.

[0038] Furthermore, in this embodiment, when the pH value detected by the pH sensor 5 is higher than the upper limit of pH, the frequency of the fan 3 is adjusted so that Q 风 satisfy When the pH value detected by pH sensor 5 is higher than the upper limit of pH, it indicates that the pH value of the reverse osmosis permeate water is too high after stripping. This can be addressed by adjusting the frequency of blower 3 to meet the pH requirement. This reduces the pH increase of the reverse osmosis permeate after each pass through the packing layer 11, thereby reducing the pH value of the reverse osmosis permeate in the storage tank 13.

[0039] Furthermore, in this embodiment, the lower pH limit is 7.0 and the upper pH limit is 8.5. This allows the pH value of the reverse osmosis permeate to have a certain margin beyond the national standard. Of course, in other embodiments, the lower and upper pH limits can be adjusted according to actual needs.

[0040] Furthermore, such as Figure 2 As shown, in this embodiment, k 下限 For 25, k 上限 The ratio is 60. When the air-to-water ratio is too low, the pH increase is too small, and the pH value still cannot meet the emission requirements after stripping; when the air-to-water ratio is too high, the increase rate of pH value is too small, but the power consumption of fan 3 increases significantly. Therefore, the air-to-water ratio should be maintained at k. 下限 and k 上限 Within this range, it can balance the increasing demand for pH value and the cost of electricity. Preferably, in this embodiment, k 下限 The value is 40, and the k is... 上限 The value is 50. Of course, in other embodiments, k can be adjusted according to actual needs. 下限 and k 上限 .

[0041] Furthermore, in this embodiment, the exhaust port is located at the top of the stripping tower 1, and a water vapor collection plate 15 is provided above the exhaust port. The water vapor collection plate 15 can collect the water vapor carried by the exhaust air and return it to the stripping tower 1, preventing reverse osmosis permeate from leaking out of the exhaust port.

[0042] Furthermore, in this embodiment, the blower 3 is a centrifugal blower, and the rated air volume of the blower 3 is 100 times the upper limit of the water treatment flow rate of the reverse osmosis permeable water treatment device. Centrifugal blowers have lower power consumption costs compared to Roots blowers or magnetic levitation blowers; and, since the rated air volume of a centrifugal blower differs significantly from the actual air volume, the rated air volume of the blower 3 is set as the water treatment flow rate of the reverse osmosis permeable water treatment device (i.e., Q). 水 A limit of 100 times can prevent the need to increase Q. 风 At that time, the power of fan 3 was insufficient.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present utility model. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A reverse osmosis permeate treatment device, characterized in that: The system includes a stripping tower (1), a reverse osmosis unit (2), and a blower (3). The stripping tower (1) is equipped with a packing layer (11), and a water distribution pipe (12) is provided above the packing layer (11). The reverse osmosis unit (2) is connected to the water distribution pipe (12). The stripping tower (1) has an air inlet below the packing layer (11) and an exhaust outlet above the packing layer (11). The blower (3) is connected to the air inlet. The bottom of the stripping tower (1) is equipped with a water storage tank (13), and a drain outlet (14) is provided on the water storage tank (13).

2. The reverse osmosis permeate treatment device according to claim 1, characterized in that: The water distribution pipe (12) is equipped with an inlet flow meter (61), and the blower (3) is equipped with an air inlet flow meter (62) between it and the air inlet. The blower (3) is connected to the inlet flow meter (61) and the air inlet flow meter (62) respectively. By adjusting the frequency of the blower (3), Q can be adjusted. 风 satisfy , where Q 水 Q is the flow rate detected by the inlet flow meter (61). 风 The flow rate detected by the air inlet flow meter (62) is k, and the air-to-water ratio is k.

3. The reverse osmosis permeate treatment device according to claim 2, characterized in that: The water storage tank (13) is equipped with a pH sensor (5). When the pH value detected by the pH sensor (5) is lower than the lower limit of pH, the frequency of the fan (3) is adjusted so that Q 风 satisfy .

4. The reverse osmosis permeate treatment device according to claim 3, characterized in that: The water storage tank (13) is also provided with a circulation port, which is connected to the water distribution pipe (12) through a circulation pump (4).

5. The reverse osmosis permeate treatment device according to claim 4, characterized in that: The pH sensor (5) is connected to the circulating pump (4), and when the fan (3) is in Q 风 satisfy When the pH value detected by the pH sensor (5) is still lower than the lower limit of pH after running for t under the specified conditions, the circulation pump (4) is started.

6. The reverse osmosis permeate treatment device according to claim 3, characterized in that: When the pH value detected by the pH sensor (5) is higher than the upper limit of pH, the frequency of the fan (3) is adjusted so that Q 风 satisfy .

7. The reverse osmosis permeate treatment device according to claim 6, characterized in that: The lower pH limit is 7.0, and the upper pH limit is 8.

5.

8. The reverse osmosis permeate treatment device according to claim 6, characterized in that: The k 下限 The value is 25, and the k is... 上限 It is 60.

9. The reverse osmosis permeate treatment device according to claim 1, characterized in that: The exhaust port is located at the top of the stripping tower (1), and a water vapor collection plate (15) is provided above the exhaust port.

10. The reverse osmosis permeate treatment apparatus according to any one of claims 1 to 9, characterized in that: The fan (3) is a centrifugal fan, and the rated air volume of the fan (3) is 100 times the upper limit of the water treatment flow of the reverse osmosis permeate treatment device.

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