Low-energy-consumption high-salinity wastewater treatment system
Through the dual-membrane distillation tank and MVR evaporation and crystallization device combined with solar distillation, the distillation effect and high cost of high-salt wastewater treatment system in low-temperature environments are solved, and low-energy consumption and high-efficiency wastewater treatment is achieved.
Patent Information
- Application Number
- CN202421956657.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-13
AI Technical Summary
The existing low-energy consumption and high-salt wastewater treatment system has poor distillation effect in low-temperature environments, resulting in incomplete purification of water quality and high operating costs, making it difficult to achieve zero emissions.
The dual membrane distillation tank is combined with the MVR evaporation and crystallization device, and the distillation is carried out using solar energy at low temperatures, and pretreated by reverse osmosis and nanofiltration salt separation devices to reduce energy consumption and resource waste.
Realize efficient distillation in low-temperature environments, reduce energy consumption and resource waste, reduce operating costs, and improve the practicality and environmental protection of the system.
Smart Images
Figure CN223060751U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of high-salt wastewater treatment, in particular to a low-energy-consumption high-salt wastewater treatment system. Background Technique
[0002] If high-salt wastewater is directly discharged or discharged after dilution, on the one hand, it causes waste of water resources; on the other hand, it will cause ecological damage to rivers, lakes, cause the disintegration of the soil ecosystem, produce malodors that affect water quality, change the color and visibility of water bodies, and form a large amount of water body suspensions and other hazards. At present, a low-energy-consumption high-salt wastewater treatment system on the market is composed of structures such as an adjustment tank, an evaporator, a nanofiltration device, etc. The construction investment and operating costs of some zero-emission treatment projects of low-energy-consumption high-salt wastewater treatment systems are high, and most of the operating costs come from energy consumption costs. Moreover, traditional distillation equipment does not perform well during distillation in an environment with a relatively low temperature, resulting in incomplete purification of water quality, and emissions will cause pollution to the environment and water quality, which is contrary to the national advocacy of carbon emission reduction, making it difficult to implement and promote zero emissions. Content of the Utility Model
[0003] In order to make up for the above deficiencies, the utility model provides a low-energy-consumption high-salt wastewater treatment system, aiming to improve the problem that distillation cannot be carried out at a relatively low temperature.
[0004] To achieve the above object, the utility model provides the following technical solution: A low-energy-consumption high-salt wastewater treatment system includes an adjustment tank, the adjustment tank, a primary pretreatment unit, a primary reverse osmosis concentration device, a secondary pretreatment unit, a nanofiltration salt separation device, a first dual-membrane distillation tank, a second dual-membrane distillation tank, a first MVR evaporation crystallization device, a second MVR evaporation crystallization device, and a clear water tank. The discharge port of the adjustment tank is connected to the feed port of the hydraulic circulation clarifier in the primary pretreatment unit. The discharge port of the ultrafiltration device in the primary pretreatment unit is connected to the feed port of the primary reverse osmosis device. The discharge port of the primary reverse osmosis device is connected to the feed port of the tubular microfiltration device in the secondary pretreatment unit. The discharge port of the ion exchange device in the secondary pretreatment unit is connected to the feed port of the nanofiltration salt separation device. The produced water of the nanofiltration salt separation device is connected to the feed port of the first dual-membrane distillation tank. The concentrated water of the nanofiltration salt separation device is connected to the feed port of the second dual-membrane distillation tank. The discharge port of the first dual-membrane distillation tank is connected to the feed port of the first MVR evaporation crystallization device. The discharge port of the second dual-membrane distillation tank is connected to the feed port of the second MVR evaporation crystallization device.
[0005] Preferably, the primary pretreatment unit includes a hydraulic circulation clarifier, a V-shaped filter tank, and an ultrafiltration device that are connected in sequence.
[0006] Preferably, the reverse osmosis membrane used in the primary reverse osmosis device is a brackish water reverse osmosis membrane or a seawater desalination reverse osmosis membrane.
[0007] Preferably, a part of the water produced by the first-stage reverse osmosis is used for cleaning the outer membrane of the dual-membrane distillation cell, a part is used for cooling water, and a part is directly recycled to the clean water tank.
[0008] Preferably, the secondary pretreatment unit includes a tubular microfiltration device and an ion exchange device connected in sequence.
[0009] Preferably, the dual-membrane distillation cell includes an inner membrane, an outer membrane, a cooling pipe, a condensate pipe, and an outer membrane cleaning water collection tank. The inner membrane is installed in the middle of the dual-membrane distillation cell. One side of the dual-membrane distillation cell is fixedly connected with a feed inlet, and the other side of the dual-membrane distillation cell is fixedly connected with a discharge outlet. The top of the dual-membrane distillation cell is fixedly connected with a cooling pipe. The top end of the cooling pipe is provided with an outer membrane. The bottom end of the outer membrane is installed at the top end of the dual-membrane distillation cell. The bottom end of the outer membrane is provided with an outer membrane cleaning water collection tank. The bottom end of the outer membrane cleaning water collection tank is provided with a condensate pipe, and the condensate pipe is located in the middle of the cooling pipe.
[0010] Preferably, the inner membrane is a hydrophobic breathable membrane, and the outer membrane is an airtight membrane to prevent unorganized emission of steam.
[0011] Preferably, the cooling pipe also serves as the outer membrane cloth skeleton, and the condensate water collection pipe is connected to the clean water tank.
[0012] Preferably, the outer membrane cleaning water collection tank is connected to the adjustment tank.
[0013] The utility model has the following beneficial effects:
[0014] 1. In the utility model, dual-membrane distillation can be carried out at a relatively low temperature. It can combine the local natural conditions and use the sun to complete the process of dual-membrane distillation. The dual-membrane distillation cell is provided with an airtight outer membrane, which can prevent the unorganized emission of water vapor, avoid burdening the environment, and at the same time, the outer membrane needs to be cleaned regularly to prevent dust and other substances from blocking sunlight, solving the problem of unable to distill in a low-temperature environment, not only reducing energy consumption but also increasing practicality.
[0015] 2. In the utility model, the reverse osmosis produced water can be used as the outer membrane cleaning water and cooling water, which not only reduces resource waste but also protects the environment. The overall process flow of the system is shorter than that of traditional equipment, and the occupied area is small, solving the problem of water resource waste, not only saving costs but also increasing practicality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a plan view of a dual-membrane distillation cell of a low-energy consumption high-salt wastewater treatment system proposed by the utility model;
[0017] Figure 2 It is a top view of a dual-membrane distillation cell of a low-energy consumption high-salt wastewater treatment system proposed by the utility model;
[0018] Figure 3 This is a structural diagram of a low - energy - consumption and high - salinity wastewater treatment system proposed by the present utility model.
[0019] Legend:
[0020] 11. Feed inlet; 12. Discharge outlet; 13. Outer membrane; 14. Cooling pipe; 15. Outer - membrane cleaning water collection tank; 16. Inner membrane; 17. Condensate water pipe. Specific embodiments
[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0022] Referring to Figures 1 - 3 , an embodiment provided by the present utility model: A low - energy - consumption and high - salinity wastewater treatment system includes an adjustment tank, an adjustment tank, a primary pretreatment unit, a primary reverse - osmosis concentration device, a secondary pretreatment unit, a nanofiltration salt - separation device, a first dual - membrane distillation tank, a second dual - membrane distillation tank, a first MVR evaporation crystallization device, a second MVR evaporation crystallization device, and a clean water tank. The discharge outlet of the adjustment tank is connected to the feed inlet of the hydraulic circulation clarifier in the primary pretreatment unit. The discharge outlet of the ultrafiltration device in the primary pretreatment unit is connected to the feed inlet of the primary reverse - osmosis device. The discharge outlet of the primary reverse - osmosis device is connected to the feed inlet of the tubular microfiltration device in the secondary pretreatment unit. The discharge outlet of the ion - exchange device in the secondary pretreatment unit is connected to the feed inlet of the nanofiltration salt - separation device. The produced water of the nanofiltration salt - separation device is connected to the feed inlet of the first dual - membrane distillation tank. The concentrated water of the nanofiltration salt - separation device is connected to the feed inlet of the second dual - membrane distillation tank. The discharge outlet of the first dual - membrane distillation tank is connected to the feed inlet of the first MVR evaporation crystallization device. The discharge outlet of the second dual - membrane distillation tank is connected to the feed inlet of the second MVR evaporation crystallization device.
[0023] Specifically, the high-salt wastewater pipeline is connected to the regulating pool. By discharging the high-salt wastewater into the regulating pool, the suspended solids and sediments in the wastewater can be separated and precipitated through the regulating pool. The primary pretreatment unit and the secondary pretreatment unit can remove or reduce the large particles in the wastewater and reduce the suspended solids in the wastewater. The primary reverse osmosis concentration device can remove the dissolved inorganic substances and organic substances in the water. The nanofiltration salt separation device can remove the dissolved salts and some ions in the water. The first dual-membrane distillation pool and the second dual-membrane distillation pool can effectively separate and extract the water in the wastewater through the distillation technology. The first MVR evaporation crystallization device and the second MVR evaporation crystallization device can effectively treat and recover the water and dissolved substances in the wastewater through the evaporation and crystallization technology. Finally, the separated and extracted water is discharged into the clear water pool, and a closed-loop connection is achieved through the pipeline.
[0024] The primary pretreatment unit includes a hydraulically circulated clarifier, a V-type filter, and an ultrafiltration device connected in series. The reverse osmosis membrane used in the primary reverse osmosis device is a brackish water reverse osmosis membrane or a seawater desalination reverse osmosis membrane; a part of the primary reverse osmosis product water is used for cleaning the outer membrane 13 of the dual-membrane distillation pool, a part of the water is used for cooling water, and a part is directly recycled to the clear water pool; the secondary pretreatment unit includes a tubular microfiltration device and an ion exchange device connected in series; the dual-membrane distillation pool includes an inner membrane 16, an outer membrane 13, a cooling pipe 14, a condensate pipe 17, and an outer membrane cleaning water collection tank 15. The inner membrane 16 is installed in the middle of the dual-membrane distillation pool. One side of the dual-membrane distillation pool is fixedly connected with a feed port 11, and the other side is fixedly connected with a discharge port 12. The top of the dual-membrane distillation pool is fixedly connected with a cooling pipe 14. The top of the cooling pipe 14 is installed with an outer membrane 13. The bottom of the outer membrane 13 is installed at the top of the dual-membrane distillation pool. The bottom of the outer membrane 13 is provided with an outer membrane cleaning water collection tank 15. The bottom of the outer membrane cleaning water collection tank 15 is provided with a condensate pipe 17. The condensate pipe 17 is located in the middle of the cooling pipe 14. The inner membrane 16 is a hydrophobic and breathable membrane, and the outer membrane 13 is an airtight membrane to prevent unorganized emission of steam; the cooling pipe 14 uses the outer membrane 13 as a skeleton, the condensate pipe 17 is connected to the clear water pool, and the outer membrane cleaning water collection tank 15 is connected to the regulating pool.
[0025] Specifically, the high-salt wastewater first enters the regulation tank for water quality and quantity regulation. The effluent from the regulation tank enters the hydraulic circulation clarifier, V-shaped filter, and ultrafiltration device of the primary pretreatment unit to remove suspended solids and particulate matter in the high-salt wastewater. The effluent after primary pretreatment enters the primary reverse osmosis device for membrane concentration. The TSD of the concentrated liquid is about 30 g / L. Part of the water produced during the reverse osmosis process is used for cleaning the outer membrane 13 of the double-membrane distillation tank, part is used as the cooling water for the double-membrane distillation tank, and part is directly recycled to the clear water tank. The concentrated liquid enters the nanofiltration salt separation device. The produced water mainly consists of sodium chloride and enters the first double-membrane distillation tank, while the concentrated liquid mainly consists of sodium sulfate and enters the second double-membrane distillation tank. The water in the double-membrane distillation tank is heated and evaporated under sunlight. The water vapor moves upward through the waterproof and breathable membrane and forms condensed water droplets through the condensation of the cooling water pipe, which are collected by the condensate pipe 17 on the inner membrane 16 and then collected into the clear water tank. To prevent dust and other debris from falling on the outer membrane 13 and affecting the sunlight irradiation efficiency, the outer membrane 13 is cleaned regularly. The cleaning water is collected in the outer membrane cleaning water collection tank 15 and finally flows to the regulation tank. The produced water mainly consisting of sodium chloride enters the first MVR evaporation crystallization device for evaporation crystallization after being concentrated by double-membrane distillation, and the concentrated liquid mainly consisting of sodium sulfate enters the second MVR evaporation crystallization device for evaporation crystallization after being concentrated by double-membrane distillation.
[0026] Working principle: The high-salt wastewater pipeline is connected to the regulation tank. By discharging the high-salt wastewater into the regulation tank, the suspended solids and sediments in the wastewater can be separated and precipitated. The primary pretreatment unit and the secondary pretreatment unit can remove or reduce the large particulate matter in the wastewater and reduce the suspended solids in the wastewater. The primary reverse osmosis concentration device can remove the dissolved inorganic substances and organic substances in the water. The nanofiltration salt separation device can remove the dissolved salts and some ions in the water. The first double-membrane distillation tank and the second double-membrane distillation tank can effectively separate and extract the water in the wastewater through the distillation technology. The first MVR evaporation crystallization device and the second MVR evaporation crystallization device can effectively treat and recover the water and dissolved substances in the wastewater through the evaporation and crystallization technology. Finally, the separated and extracted water is discharged into the clear water tank and connected in a closed loop through the pipeline.
[0027] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A low - energy - consumption high - salinity wastewater treatment system, comprising an adjustment tank, characterized in that: The regulating pond, the primary pretreatment unit, the primary reverse osmosis concentration device, the secondary pretreatment unit, the nanofiltration salt separation device, the first dual-membrane distillation pond, the second dual-membrane distillation pond, the first MVR evaporation crystallization device, the second MVR evaporation crystallization device, and the clean water pond. The discharge port of the regulating pond is connected to the feed port of the hydraulic circulation clarifier in the primary pretreatment unit. The discharge port of the ultrafiltration device in the primary pretreatment unit is connected to the feed port of the primary reverse osmosis device. The discharge port of the primary reverse osmosis device is connected to the feed port of the tubular microfiltration device in the secondary pretreatment unit. The discharge port of the ion exchange device in the secondary pretreatment unit is connected to the feed port of the nanofiltration salt separation device. The produced water of the nanofiltration salt separation device is connected to the feed port of the first dual-membrane distillation pond. The concentrated water of the nanofiltration salt separation device is connected to the feed port of the second dual-membrane distillation pond. The discharge port of the first dual-membrane distillation pond is connected to the feed port of the first MVR evaporation crystallization device. The discharge port of the second dual-membrane distillation pond is connected to the feed port of the second MVR evaporation crystallization device.
2. The low-energy consumption and high-salt wastewater treatment system according to claim 1, wherein: The primary pretreatment unit includes a hydraulic circulation clarifier, a V-shaped filter tank, and an ultrafiltration device that are connected in sequence.
3. The low-energy high-salt wastewater treatment system according to claim 1, characterized in that: The reverse osmosis membrane used in the primary reverse osmosis device is a brackish water reverse osmosis membrane or a seawater desalination reverse osmosis membrane.
4. A low-energy high-salt wastewater treatment system according to claim 3, characterized in that: A part of the produced water of the primary reverse osmosis is used for cleaning the outer membrane of the dual-membrane distillation pond, a part of the water is used for cooling water, and a part is directly recycled to the clean water pond.
5. A low-energy high-salt wastewater treatment system according to claim 1, characterized in that: The secondary pretreatment unit includes a tubular microfiltration device and an ion exchange device that are connected in sequence.
6. A low-energy high-salt wastewater treatment system according to claim 1, characterized in that: The dual-membrane distillation pond includes an inner membrane, an outer membrane, a cooling pipe, a condensate pipe, and an outer membrane cleaning water collection tank. The inner membrane is installed in the middle of the dual-membrane distillation pond. One side of the dual-membrane distillation pond is fixedly connected with a feed port. The other side of the dual-membrane distillation pond is fixedly connected with a discharge port. The top of the dual-membrane distillation pond is fixedly connected with a cooling pipe. The top of the cooling pipe is installed with an outer membrane. The bottom end of the outer membrane is installed at the top end of the dual-membrane distillation pond. The bottom end of the outer membrane is provided with an outer membrane cleaning water collection tank. The bottom end of the outer membrane cleaning water collection tank is provided with a condensate pipe. The condensate pipe is located in the middle of the cooling pipe.
7. The low-energy high-salt wastewater treatment system according to claim 6, characterized in that: The inner membrane is a hydrophobic breathable membrane, and the outer membrane is an airtight membrane to prevent unorganized emission of steam.
8. A low-energy high-salt wastewater treatment system according to claim 7, characterized in that: The cooling pipe also serves as the outer membrane cloth skeleton, and the condensate collection pipe is connected to the clean water pond.
9. A low-energy high-salt wastewater treatment system according to claim 7, characterized in that: The outer membrane cleaning water collection tank is connected to the regulating pond.