A reverse osmosis concentrated drainage recovery device

Abstract

The present application relates to the technical field of concentrated drainage recycling, and in particular to a reverse osmosis concentrated drainage recycling device, which includes a concentrated drainage tank, a heater, an impurity filter, a plate heat exchanger, a hydrochloric acid dosing tank, an antiscalant dosing tank, a bag filter, a security filter, a high-pressure pump and a reverse osmosis device, wherein the concentrated drainage tank, the heater, the impurity filter, the plate heat exchanger, the hydrochloric acid dosing tank, the antiscalant dosing tank, the bag filter, the security filter, the high-pressure pump and the reverse osmosis device are sequentially connected through pipelines, and one outlet end of the reverse osmosis device is connected to a raw water tank, and the other outlet end is connected to a concentrated water collection box. The present application has the effect of reducing water resource waste and reducing costs.

Description

Technical Field

[0001] The present application relates to the technical field of concentrated wastewater recovery and utilization, and in particular to a reverse osmosis concentrated wastewater recovery device. Background Art

[0002] Reverse osmosis (RO) concentrated water is often recycled and reused in lithium carbonate production systems. The process of preparing pure water with the reverse osmosis (RO) process produces concentrated water, which contains various organic and inorganic pollutants. If it is discharged directly, it may pollute the soil, surface water, ocean, etc.; if it is discharged into the municipal sewage treatment system, the excessively high total dissolved solids are also very unfavorable to the growth of activated sludge. The highly concentrated RO concentrated water and the chemicals introduced by the cleaning agent and scale inhibitor are directly discharged into the environment, which will inevitably have an adverse effect. Therefore, finding an economical and efficient RO concentrated water treatment method is of great significance to environmental protection.

[0003] In actual production, the 150T reverse osmosis system runs continuously and produces about 1680m3 per day. 3 (About 70m 3 / h) concentrated drainage is discharged through sewage pipes, resulting in serious waste of water resources. In order to reduce water resource waste and reduce costs, 70T reverse osmosis equipment has been used for secondary recycling of concentrated drainage. However, the reverse osmosis equipment currently only has an antiscalant dosing device. According to the full analysis data of concentrated drainage, the calcium and magnesium ion content in the water is high, with calcium ions of 274.1mg / L and ions of 205.4mg / L, which is the main reason for the blockage of reverse osmosis membrane and the decrease in recovery rate. Utility Model Content

[0004] In order to reduce water resource waste and lower costs, the present application provides a reverse osmosis concentrated drainage recovery device.

[0005] The present application provides a reverse osmosis concentrated drainage recovery device that adopts the following technical solution:

[0006] A reverse osmosis concentrated drainage recovery device comprises a concentrated drainage tank, a heater, an impurity filter, a plate heat exchanger, a hydrochloric acid dosing tank, an antiscalant dosing tank, a bag filter, a security filter, a high-pressure pump and a reverse osmosis device. The concentrated drainage tank, the heater, the impurity filter, the plate heat exchanger, the hydrochloric acid dosing tank, the antiscalant dosing tank, the bag filter, the security filter, the high-pressure pump and the reverse osmosis device are connected in sequence through pipelines. One outlet end of the reverse osmosis device is connected to a raw water tank, and the other outlet end is connected to a concentrated water collection box.

[0007] By adopting the above technical scheme, the concentrated drainage is heated after flowing out of the concentrated drainage pool, that is, the heating precipitation method is adopted to heat the concentrated drainage to a relatively high temperature, so that the calcium and magnesium ions are crystallized and precipitated, and then the precipitate is filtered out through the impurity filter, and then the concentrated drainage is cooled by the plate heat exchanger, and then the calcium and magnesium ions in the concentrated drainage are removed through the hydrochloric acid dosing tank, and then the scale inhibitor dosing tank, bag filter, and security filter are sequentially removed. The concentrated drainage is then transported to the reverse osmosis equipment through a high-pressure pump, and separated by the reverse osmosis equipment to obtain concentrated water and usable raw water, which are stored in the concentrated water collection box and the raw water pool respectively, so as to realize the recovery and reuse of concentrated water used in the RO water of the lithium carbonate production system, improve the recovery rate of concentrated drainage, and achieve the purpose of saving water resources and reducing costs.

[0008] Optionally, the filtration system formed by the antiscalant dosing tank, bag filter, security filter, high-pressure pump and reverse osmosis equipment is provided with two groups, and the two groups of filtration systems are arranged in parallel.

[0009] By adopting the above technical solution, the filtration system formed by the scale inhibitor dosing tank, bag filter, security filter, high-pressure pump and reverse osmosis equipment is set into two groups. The two groups of filtration systems filter at the same time, which speeds up the filtration rate, shortens the time used for filtration, and can effectively control costs and increase efficiency.

[0010] Optionally, the inlet end of the reverse osmosis device is also connected to a reverse osmosis cleaning device and an acid-base cleaning device, and the reverse osmosis cleaning device and the acid-base cleaning device are arranged in parallel.

[0011] By adopting the above technical solution, since the filter membrane required by the reverse osmosis equipment is expensive and easy to clog, reverse osmosis cleaning equipment and acid-base cleaning equipment are provided to clean the reverse osmosis equipment at intervals, thereby extending the service life of the filter membrane and maintaining a good filtering effect.

[0012] Optionally, the reverse osmosis cleaning equipment includes a cleaning solution tank and a cleaning water pump, one end of the cleaning water pump is connected to the outlet of the cleaning solution tank, and the other end is connected to the inlet of the security filter, and the cleaning water outlet of the reverse osmosis equipment is connected to the inlet of the cleaning solution tank.

[0013] By adopting the above technical solution, when the reverse osmosis equipment needs to be finally cleaned, the cleaning water pump transports the cleaning liquid in the cleaning solution tank to the security filter, and after filtration, it is transported to the reverse osmosis equipment by the high-pressure pump for cleaning. The cleaning liquid after cleaning flows back to the cleaning solution tank again to form a cleaning reflux, which effectively saves water resources.

[0014] Optionally, the acid-base cleaning equipment includes an acid-base cleaning tank and an acid-base water pump, one end of the acid-base water pump is connected to the outlet end of the acid-base cleaning tank, and the other end is connected to the clean water inlet end of the reverse osmosis equipment.

[0015] By adopting the above technical solution, an acid-base cleaning tank is set at the clean water inlet end of the reverse osmosis equipment. When the reverse osmosis equipment needs to be cleaned, the cleaning liquid is transported to the reverse osmosis equipment through the acid-base water pump, thereby achieving acid-base cleaning.

[0016] Optionally, a raw water pipeline and / or a cleaning water production pipeline is provided at the inlet end of the acid-base cleaning tank, the raw water pipeline is connected to the raw water pool, and the cleaning water production pipeline is connected to the cleaning water production outlet end of the reverse osmosis equipment.

[0017] By adopting the above technical scheme, the raw water and cleaning water obtained by reverse osmosis are introduced into the acid-base cleaning tank for storage again, and used when the reverse osmosis equipment is subjected to acid-base cleaning, thereby realizing the recycling of water resources. The process flow is short, the recycling rate is high, the operation is simple, and it is conducive to cost reduction, efficiency improvement and comprehensive utilization of energy.

[0018] Optionally, a tap water pipeline and a hydrochloric acid pipeline are provided on the hydrochloric acid dosing tank, and a stirring structure is provided inside the hydrochloric acid dosing tank.

[0019] By adopting the above technical solution, since hydrochloric acid is volatile, it is better to prepare it immediately when using it. First, water is introduced into the hydrochloric acid dosing tank, and then hydrochloric acid is introduced in the form of acid into water, and then slowly stirred with a stirring structure to achieve non-volatile addition of hydrochloric acid and reduce air pollution.

[0020] Optionally, a pH detector is provided on the concentrated drainage pipeline between the hydrochloric acid dosing tank and the scale inhibitor dosing tank.

[0021] By adopting the above technical solution, the pH detector can monitor the pH of concentrated drainage water to which hydrochloric acid water is added at any time to determine whether the amount of hydrochloric acid added is appropriate, thereby ensuring that the pH of the concentrated drainage water is within the set range.

[0022] Optionally, thermometers are provided at both the concentrated wastewater inlet and outlet of the plate filter.

[0023] By adopting the above technical solution, thermometers are set at the concentrated wastewater inlet and outlet ends of the plate filter, so as to determine the temperature of the concentrated wastewater before and after entering the plate filter, thereby ensuring that the heated concentrated wastewater is cooled to the set temperature before entering the hydrochloric acid dosing tank.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. First, the concentrated wastewater is heated to a higher temperature through a heater to crystallize and precipitate calcium and magnesium ions, and then the precipitate is filtered out through an impurity filter, and then the concentrated wastewater is cooled through a plate heat exchanger, and then the calcium and magnesium ions in the concentrated wastewater are removed through a hydrochloric acid dosing tank, and then through impurity removal equipment and reverse osmosis equipment, concentrated water and usable raw water are obtained, which are stored in a concentrated water collection tank and a raw water pool respectively, realizing the recovery and reuse of concentrated water used in the lithium carbonate production system RO water, improving the recovery rate of concentrated wastewater, and achieving the purpose of saving water resources and reducing costs.

[0026] 2. By setting up reverse osmosis cleaning equipment and acid-base cleaning equipment, the reverse osmosis equipment can be cleaned at intervals, so that the service life of the filter membrane is extended and the filtering effect is maintained at a good level.

[0027] 3. By first passing water into the hydrochloric acid dosing tank, and then passing hydrochloric acid, adding it in the form of acid into water, and then slowly stirring with a stirring structure, the non-volatile addition of hydrochloric acid is achieved to reduce air pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a reverse osmosis concentrated drainage recovery device in the present application.

[0029] Figure 2 It is a structural schematic diagram of the acid-base cleaning equipment in this application.

[0030] Figure 3 It is a structural schematic diagram of the reverse osmosis cleaning equipment in this application.

[0031] Figure 4 It is a structural schematic diagram of the hydrochloric acid dosing tank in this application.

[0032] Explanation of the reference numerals: 1. concentrated water tank; 2. heater; 3. impurity filter; 4. plate heat exchanger; 5. hydrochloric acid dosing tank; 51. stirring structure; 6. scale inhibitor dosing tank; 7. bag filter; 8. security filter; 9. high-pressure pump; 10. reverse osmosis equipment; 11. raw water tank; 12. concentrated water collection tank; 13. reverse osmosis cleaning equipment; 130. cleaning solution tank; 131. cleaning water pump; 14. acid and alkali cleaning equipment; 140. acid and alkali cleaning tank; 141. acid and alkali water pump; 15. raw water pipeline; 16. cleaning water production pipeline; 17. tap water pipeline; 18. hydrochloric acid pipeline; 19. pH detector; 20. thermometer; 21. hydraulic pump; 22. water use point. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-4 This application is described in further detail.

[0034] The present application discloses a reverse osmosis concentrated drainage recovery device. Figure 1A reverse osmosis concentrated drainage recovery device includes a concentrated drainage tank 1, a heater 2, an impurity filter 3, a plate heat exchanger 4, a hydrochloric acid dosing tank 5, a scale inhibitor dosing tank 6, a bag filter 7, a security filter 8, a high-pressure pump 9 and a reverse osmosis device 10, wherein the concentrated drainage tank 1, the heater 2, the impurity filter 3, the plate heat exchanger 4, the bag filter 7, the security filter 8, the high-pressure pump 9 and the reverse osmosis device 10 are connected in sequence through pipelines, and the hydrochloric acid dosing tank 5 and the scale inhibitor dosing tank 6 are connected to the concentrated drainage pipeline respectively through pipelines, and each official road is provided with an electric control valve and / or a butterfly valve and / or a check valve and / or a ball valve according to actual needs. In this application, in order to speed up the process flow, the filtration system formed by the scale inhibitor dosing tank 6, the bag filter 7, the security filter 8, the high-pressure pump 9 and the reverse osmosis device 10 is provided with two groups, and the two groups of filtration systems are arranged in parallel. One outlet end of the reverse osmosis equipment 10 is connected to the raw water pool 11, and there are multiple water use points in the raw water pool 11. A hydraulic pump 21 is arranged between the water use points and the raw water pool 11. Under the action of the hydraulic pump 21, the produced water in the raw water pool 11 can be transported to multiple water use points; the other outlet end of the reverse osmosis equipment 10 is connected to the concentrated water collection tank 12.

[0035] Since the osmotic membrane used in the reverse osmosis equipment 10 is expensive and easy to be clogged, in order to facilitate timely cleaning of the reverse osmosis equipment 10, the inlet end of the reverse osmosis equipment 10 is also connected to a reverse osmosis cleaning device 13 and an acid-base cleaning device 14. The reverse osmosis cleaning device 13 and the acid-base cleaning device 14 are arranged in parallel to perform acid-base cleaning and clean water cleaning on the reverse osmosis equipment 10 respectively.

[0036] When selecting the permeable membrane, after comparative analysis, it was found that Dow's anti-pollution membrane was used in concentrated wastewater recovery, which was prone to clogging, high in price, and had a long procurement cycle, seriously affecting production efficiency; while the domestic PURO-YR2 membrane was a polyamide composite membrane specially used for industrial wastewater desalination, with the characteristics of low operating pressure, high water output, and high desalination rate, and it was cost-effective and easy to maintain. Therefore, the domestic PURO-YR2 membrane was selected in this application.

[0037] In order to prevent the damage of high pressure to the permeable membrane, a 45kW inverter was added and the original high-pressure pump 9 industrial frequency soft start control was transformed into variable frequency starting control.

[0038] In the lithium carbonate production system, the concentrated wastewater itself has a temperature. After being heated and precipitated by the heater 2, the temperature of the concentrated wastewater is even higher. Therefore, thermometers 20 are provided at the inlet and outlet ends of the plate heat exchanger 4 to facilitate the operator to monitor the temperature of the concentrated wastewater before and after passing through the plate heat exchanger 4 at any time, so as to timely adjust the temperature of the cold flow in the plate heat exchanger 4, thereby reducing the temperature of the concentrated wastewater entering the plate heat exchanger 4 to the set temperature.

[0039] A pH detector 19 is provided on the concentrated drainage pipeline between the hydrochloric acid dosing tank 5 and the scale inhibitor dosing tank 6, so that the operator can know the pH value of the concentrated drainage to which hydrochloric acid is added in time, so as to make timely adjustments.

[0040] Reference Figure 2 The acid-base cleaning equipment 14 includes an acid-base cleaning tank 140 and an acid-base water pump 141. One end of the acid-base water pump 141 is connected to the outlet end of the acid-base cleaning tank 140, and the other end is connected to the clean water inlet end of the reverse osmosis equipment 10. When the reverse osmosis equipment 10 needs to be cleaned with acid and alkali, the acid-base water pump 141 transports the acid-base cleaning water in the acid-base cleaning tank 140 to the reverse osmosis equipment 10 for cleaning.

[0041] In order to save water and reuse water resources, a raw water pipeline 15 and / or a cleaning water production pipeline 16 are provided at the inlet end of the acid-base cleaning tank 140. The raw water pipeline 15 is connected to the raw water pool 11, and the cleaning water production pipeline 16 is connected to the cleaning water production outlet end of the reverse osmosis device 10. That is, the water in the raw water pool 11 or the water produced by the clean water cleaning of the reverse osmosis device 10 can be led to the acid-base cleaning tank 140, thereby realizing the reuse of raw water.

[0042] Reference Figure 3 The reverse osmosis cleaning device 13 includes a cleaning solution tank 130 and a cleaning water pump 131. One end of the cleaning water pump 131 is connected to the outlet of the cleaning solution tank 130, and the other end is connected to the inlet of the security filter 8. The outlet of the cleaning water produced by the reverse osmosis device 10 is connected to the inlet of the cleaning solution tank 130. When the reverse osmosis device 10 needs to be cleaned with clean water, the cleaning water pump 131 transports the cleaning solution in the cleaning solution tank 130 to the security filter 8, and then transports it to the reverse osmosis device 10 through the high-pressure pump 9 for clean water cleaning. The clean water produced by cleaning can be returned to the cleaning solution tank 130 again for reflux flushing. When the cleaning solution in the cleaning solution tank 130 needs to be replaced, it only needs to be discharged and then added with new water.

[0043] Reference Figure 4 The hydrochloric acid dosing tank 5 is provided with a tap water pipe 17 and a hydrochloric acid pipe 18, and a stirring structure 51 is provided in the hydrochloric acid dosing tank 5. When adding hydrochloric acid to the hydrochloric acid dosing tank 5, tap water is first introduced from the tap water pipe 17, and then hydrochloric acid is slowly added while stirring with the stirring structure 51 to prevent the hydrochloric acid from volatilizing. In order to prevent hydrochloric acid from corroding the equipment, in this application, the tap water pipe 17, the hydrochloric acid pipe 18 and the hydrochloric acid dosing tank 5 are all made of corrosion-resistant PVC material.

[0044] The hydrochloric acid reacts with the calcium and magnesium ions in the concentrated wastewater to form calcium chloride and magnesium chloride precipitates, which are then filtered out by the bag filter 7 and the security filter 8.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A reverse osmosis concentrated drainage recovery device, characterized in that: The invention comprises a concentrated water tank (1), a heater (2), an impurity filter (3), a plate heat exchanger (4), a hydrochloric acid dosing tank (5), a scale inhibitor dosing tank (6), a bag filter (7), a security filter (8), a high-pressure pump (9) and a reverse osmosis device (10). The concentrated water tank (1), the heater (2), the impurity filter (3), the plate heat exchanger (4), the hydrochloric acid dosing tank (5), the scale inhibitor dosing tank (6), the bag filter (7), the security filter (8), the high-pressure pump (9) and the reverse osmosis device (10) are connected in sequence through pipelines. One outlet end of the reverse osmosis device (10) is connected to a raw water tank (11), and the other outlet end is connected to a concentrated water collection tank (12).

2. A reverse osmosis concentrated wastewater recovery device according to claim 1, characterized in that: The antiscalant dosing tank (6), the bag filter (7), the security filter (8), the high-pressure pump (9) and the reverse osmosis equipment (10) form a filtering system which is arranged in two groups and is arranged in parallel.

3. A reverse osmosis concentrated wastewater recovery device according to claim 1, characterized in that: The inlet end of the reverse osmosis device (10) is also connected to a reverse osmosis cleaning device (13) and an acid-base cleaning device (14), and the reverse osmosis cleaning device (13) and the acid-base cleaning device (14) are arranged in parallel.

4. A reverse osmosis concentrated wastewater recovery device according to claim 3, characterized in that: The reverse osmosis cleaning device (13) comprises a cleaning solution tank (130) and a cleaning water pump (131); one end of the cleaning water pump (131) is connected to the outlet of the cleaning solution tank (130), and the other end is connected to the inlet of the security filter (8); the cleaning water outlet of the reverse osmosis device (10) is connected to the inlet of the cleaning solution tank (130).

5. A reverse osmosis concentrated wastewater recovery device according to claim 3, characterized in that: The acid-base cleaning equipment (14) comprises an acid-base cleaning tank (140) and an acid-base water pump (141); one end of the acid-base water pump (141) is connected to the outlet of the acid-base cleaning tank (140), and the other end is connected to the cleaning water inlet of the reverse osmosis equipment (10).

6. A reverse osmosis concentrated wastewater recovery device according to claim 5, characterized in that: The inlet end of the acid-base cleaning tank (140) is provided with a raw water pipeline (15) and / or a cleaning water production pipeline (16); the raw water pipeline (15) is connected to the raw water pool (11); and the cleaning water production pipeline (16) is connected to the cleaning water production outlet end of the reverse osmosis device (10).

7. A reverse osmosis concentrated wastewater recovery device according to claim 1, characterized in that: The hydrochloric acid dosing tank (5) is provided with a tap water pipeline (17) and a hydrochloric acid pipeline (18), and a stirring structure (51) is provided inside the hydrochloric acid dosing tank (5).

8. The reverse osmosis concentrated wastewater recovery device according to claim 1, characterized in that: A pH detector (19) is provided on the concentrated drainage pipeline between the hydrochloric acid dosing tank (5) and the scale inhibitor dosing tank (6).

9. A reverse osmosis concentrated wastewater recovery device according to claim 1, characterized in that: The concentrated wastewater inlet and outlet of the plate heat exchanger (4) are both provided with thermometers (20).

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