Treatment device for removing sulfate radicals in water through combination of membrane concentration and calcium sulfate crystallization device

Abstract

The utility model belongs to the technical field of strong brine treatment, and particularly relates to a treatment device for removing sulfate radicals in water through combination of membrane concentration and a calcium sulfate crystallization device, the input end of the calcium sulfate crystallization device is provided with a raw water inlet, and the output end of the calcium sulfate crystallization device is connected with a drainage pipe. According to the utility model, high-concentration calcium ions and sulfate ions in high-salinity raw water can be precipitated through the calcium sulfate crystallization device, suspended matters generated by calcium sulfate crystallization are removed through the filtration treatment device, output filtered produced water enters the membrane concentration device, concentrated water is separated by utilizing the salt separation effect of the membrane concentration device, and the concentrated water is recycled. And then the membrane concentration concentrated water is introduced into the calcium sulfate crystallization device through the concentrated water discharge pipe, so that the effect of removing sulfate radicals from the membrane concentration concentrated water is realized, and the investment cost can be saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of concentrated brine treatment, and specifically relates to a treatment device for removing sulfate radicals in water by combining a membrane concentration device with a calcium sulfate crystallization device. Background Art

[0002] Sulfate wastewater is produced in large quantities. If these substances are not properly treated and discharged into the water, the sulfate content in the water will exceed the standard. When the sulfate content in natural water is too high, the sulfate substances will slowly diffuse in the water and eventually settle at the bottom of the water. There are also a large number of sulfate-reducing bacteria in the sediment layer. These microorganisms will become very active and have a strong metabolism under the anaerobic conditions at the bottom of the water, resulting in a large number of breeding. The sulfate will be gradually reduced, and the SO4 2- It will be restored to S 2- These sulfur ions will combine with most of the metal ions in the sediment layer, accelerating the production of methylmercury in the water and changing the original ecological regulation function of the water body, causing damage to the water ecosystem and having a great negative impact on the growth of surrounding animals and plants.

[0003] At present, the existing brine treatment methods (such as Figure 3 ), usually the brine is reduced in hardness by a double alkali method, and then filtered and disposed of before entering a membrane concentration device for salt separation. The membrane concentrated concentrated water is evaporated through an evaporator to produce sodium sulfate salt, and the membrane concentrated water enters a high-pressure reverse osmosis concentration and then enters an evaporator to produce sodium chloride salt. On the one hand, this method is difficult to control the process, and on the other hand, a large amount of reagents will be added, which not only increases the total dissolved solids content in the water and increases the evaporation load of the subsequent evaporation system, but also produces a large amount of sludge. If it is not well controlled, it will cause scaling of the membrane system; and this method will increase the investment and operating costs of the evaporation device, and the energy consumption is very high. Utility Model Content

[0004] The utility model aims to provide a treatment device for removing sulfate radicals from water by combining membrane concentration with calcium sulfate crystallization device, aiming to solve the existing treatment methods of concentrated brine (such as Figure 3 ), usually the brine is reduced in hardness by a double alkali method, and then filtered and treated before entering a membrane concentration device for salt separation. The membrane concentrated concentrated water is evaporated through an evaporator to produce sodium sulfate salt, and the membrane concentrated water enters a high-pressure reverse osmosis concentration and then enters an evaporator to produce sodium chloride salt. On the one hand, this method is difficult to control the process, and on the other hand, a large amount of reagents will be added, which not only increases the total dissolved solids content in the water, increases the evaporation load of the subsequent evaporation system, but also produces a large amount of sludge. If it is not well controlled, it will cause scaling of the membrane system; and this method will increase the investment and operating costs of the evaporation device, and has high energy consumption.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a treatment device for removing sulfate radicals in water by combining membrane concentration with a calcium sulfate crystallization device, comprising a calcium sulfate crystallization device, wherein the input end of the calcium sulfate crystallization device is provided with a raw water inlet, and the output end of the calcium sulfate crystallization device is connected to a drain pipe;

[0006] One end of the drainage pipe is connected to a first filter, the output end of the first filter is connected to a second filter through a pipeline, the output end of the second filter is connected to a membrane concentration device through a pipeline, and the output end of the membrane concentration device is connected to a produced water discharge pipe.

[0007] As a preferred treatment device for removing sulfate radicals in water by combining membrane concentration with a calcium sulfate crystallization device according to the utility model, the output end of the calcium sulfate crystallization device is provided with a calcium sulfate discharge outlet.

[0008] As a preferred treatment device of the utility model for removing sulfate ions in water by combining membrane concentration with a calcium sulfate crystallization device, the output end of the membrane concentration device is connected to a concentrate discharge pipe, one end of the concentrate discharge pipe is connected to a concentrate reflux pipe, and the input end of the calcium sulfate crystallization device is provided with a concentrate inlet.

[0009] As a preferred treatment device for removing sulfate radicals in water by combining membrane concentration with a calcium sulfate crystallization device of the utility model, one end of the concentrated water return pipe is connected to the input end of the calcium sulfate crystallization device through a concentrated water inlet.

[0010] As a preferred treatment device for removing sulfate radicals in water by combining membrane concentration with a calcium sulfate crystallization device of the utility model, the membrane concentration device can form a reflux with the calcium sulfate crystallization device through a concentrated water discharge pipe, a concentrated water return pipe and a concentrated water inlet.

[0011] As a preferred treatment device for removing sulfate from water by combining membrane concentration with a calcium sulfate crystallization device according to the utility model, the first filter and the second filter are arranged between the calcium sulfate crystallization device and the membrane concentration device.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] By connecting the raw water inlet with the external raw water pipe, the calcium sulfate crystallization device can precipitate the high concentration of calcium ions and sulfate ions in the high-salt raw water, and then transport them to the first filter and the second filter through the drainage pipe respectively to remove the suspended matter produced by the calcium sulfate crystallization. The output filtered water enters the membrane concentration device, and then the salt separation effect of the membrane concentration device is used to separate the secondary ions from the monovalent ions so that the divalent ions are retained on the concentrated water side, thereby increasing the concentration of calcium ions and sulfate ions in the water again. Then, the membrane concentrated concentrated water is introduced into the concentrated water reflux pipe through the concentrated water discharge pipe and refluxed to the front-end calcium sulfate crystallization device again, thereby achieving the effect that the membrane concentrated concentrated water does not need to be treated separately, and can save the high treatment cost of the subsequent system for the membrane concentrated concentrated water as well as the equipment investment and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of the connection structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the process of the utility model;

[0017] Figure 3 The utility model is a schematic diagram of the process flow of the existing concentrated brine treatment method.

[0018] In the figure: 1. Calcium sulfate crystallization device; 2. Raw water inlet; 3. Drain pipe; 4. First filter; 5. Second filter; 6. Membrane concentration device; 7. Product water discharge pipe; 8. Concentrate water discharge pipe; 9. Concentrate water reflux pipe; 10. Concentrate water inlet; 11. Calcium sulfate discharge outlet. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-2 The utility model provides the following technical solutions: a treatment device for removing sulfate radicals in water by combining membrane concentration with a calcium sulfate crystallization device, comprising a calcium sulfate crystallization device 1, wherein the input end of the calcium sulfate crystallization device 1 is provided with a raw water inlet 2, and the output end of the calcium sulfate crystallization device 1 is connected to a drain pipe 3;

[0021] One end of the drainage pipe 3 is connected to a first filter 4, the output end of the first filter 4 is connected to a second filter 5 through a pipeline, the output end of the second filter 5 is connected to a membrane concentration device 6 through a pipeline, and the output end of the membrane concentration device 6 is connected to a produced water discharge pipe 7;

[0022] It should be noted that the raw water inlet 2 needs to be connected to the external raw water pipeline, so that the high-salt water is transported into the calcium sulfate crystallization device 1, and the produced water discharge pipe 7 is connected to the external connecting pipe to transport the produced water after salt separation;

[0023] It is more important to note that the membrane concentration device 6 includes RO, NF, evaporation, and the like.

[0024] Preferably: the output end of the calcium sulfate crystallization device 1 is provided with a calcium sulfate discharge port 11, the output end of the membrane concentration device 6 is connected to a concentrated water discharge pipe 8, one end of the concentrated water discharge pipe 8 is connected to a concentrated water return pipe 9, the input end of the calcium sulfate crystallization device 1 is provided with a concentrated water inlet 10, one end of the concentrated water return pipe 9 is connected to the input end of the calcium sulfate crystallization device 1 through the concentrated water inlet 10, and the membrane concentration device 6 can form a reflux with the calcium sulfate crystallization device 1 through the concentrated water discharge pipe 8, the concentrated water return pipe 9, and the concentrated water inlet 10.

[0025] During specific use, by connecting the raw water inlet 2 to the external raw water pipe, the calcium sulfate crystallization device 1 can precipitate the high concentration of calcium ions and sulfate ions in the high-salt raw water, and then transport them to the first filter 4 and the second filter 5 through the drainage pipe 3 respectively to remove the suspended matter produced by the calcium sulfate crystallization. The output filtered water enters the membrane concentration device 6, and then the salt separation effect of the membrane concentration device 6 is used to separate the secondary ions from the monovalent ions so that the divalent ions are retained on the concentrated water side, thereby increasing the concentration of calcium ions and sulfate ions in the water again, and then the membrane concentrated concentrated water is introduced into the concentrated water reflux pipe 9 through the concentrated water discharge pipe 8 and refluxed to the front-end calcium sulfate crystallization device 1 again.

[0026] Preferably, the first filter 4 and the second filter 5 are arranged between the calcium sulfate crystallization device 1 and the membrane concentration device 6 .

[0027] During specific use, when the drain pipe 3 at the output end of the calcium sulfate crystallization device 1 transports water to the first filter 4 and the second filter 5, the suspended matter generated by the operation of the calcium sulfate crystallization device 1 can be removed through the first filter 4 and the second filter 5.

[0028] Working principle: First, the raw water inlet 2 is connected to the external raw water pipe to realize the transportation of high-salt water, so that the calcium sulfate crystallization device 1 can precipitate the high-concentration calcium ions and sulfate ions in the high-salt raw water, and then transport them to the first filter 4 and the second filter 5 respectively through the drain pipe 3, and the suspended matter generated by the calcium sulfate crystallization is removed by the filtration treatment device. The output filtered water enters the membrane concentration device 6, and then the salt separation effect of the membrane concentration device 6 is used to separate the secondary ions from the monovalent ions so that the divalent ions are retained on the concentrated water side, thereby increasing the concentration of calcium ions and sulfate ions in the water again, and then the membrane concentrated concentrated water is introduced into the concentrated water reflux pipe 9 through the concentrated water discharge pipe 8 and refluxed to the front-end calcium sulfate crystallization device 1 again, thereby achieving the effect that the membrane concentrated concentrated water does not need to be treated separately, and can save the high treatment cost of the subsequent system for the membrane concentrated concentrated water as well as the equipment investment and operating costs.

[0029] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, 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 treatment device for removing sulfate from water by combining membrane concentration with a calcium sulfate crystallization device, comprising a calcium sulfate crystallization device (1), characterized in that: The input end of the calcium sulfate crystallization device (1) is provided with a raw water inlet (2), and the output end of the calcium sulfate crystallization device (1) is connected to a drain pipe (3); One end of the drainage pipe (3) is connected to a first filter (4), the output end of the first filter (4) is connected to a second filter (5) via a pipeline, the output end of the second filter (5) is connected to a membrane concentration device (6) via a pipeline, and the output end of the membrane concentration device (6) is connected to a produced water discharge pipe (7).

2. A treatment device for removing sulfate radicals from water by membrane concentration in combination with a calcium sulfate crystallization device according to claim 1, characterized in that: The output end of the calcium sulfate crystallization device (1) is provided with a calcium sulfate discharge outlet (11).

3. A treatment device for removing sulfate radicals from water by membrane concentration in combination with a calcium sulfate crystallization device according to claim 1, characterized in that: The output end of the membrane concentration device (6) is connected to a concentrated water discharge pipe (8), one end of the concentrated water discharge pipe (8) is connected to a concentrated water return pipe (9), and the input end of the calcium sulfate crystallization device (1) is provided with a concentrated water inlet (10).

4. A treatment device for removing sulfate radicals from water by membrane concentration in combination with a calcium sulfate crystallization device according to claim 3, characterized in that: One end of the concentrated water return pipe (9) is connected to the input end of the calcium sulfate crystallization device (1) via a concentrated water inlet (10).

5. A treatment device for removing sulfate radicals from water by membrane concentration in combination with a calcium sulfate crystallization device according to claim 3, characterized in that: The membrane concentration device (6) can form a reflux with the calcium sulfate crystallization device (1) via the concentrated water discharge pipe (8), the concentrated water return pipe (9), and the concentrated water inlet (10).

6. A treatment device for removing sulfate radicals from water by membrane concentration in combination with a calcium sulfate crystallization device according to claim 1, characterized in that: The first filter (4) and the second filter (5) are arranged between the calcium sulfate crystallization device (1) and the membrane concentration device (6).

Images