Device for direct resourceful treatment of industrial byproduct heavy salt water

Abstract

The utility model belongs to the field of treatment of industrial byproduct heavy salt water, and relates to a device for directly resourcefully treating the industrial byproduct heavy salt water. Comprising a primary purification unit, a secondary purification unit and a bipolar membrane electrodialysis device, the primary purification unit sequentially comprises an organic matter removal device, a dechlorination device, a denitration device and a pH (Potential of Hydrogen) adjusting device; the secondary purification unit is a chelating resin tower; the pH adjusting device is sequentially connected with the chelating resin tower and the bipolar membrane electrodialysis device. The device for directly resourcefully treating the industrial byproduct heavy salt water is low in energy consumption, and can directly produce an acid solution and an alkali solution for recycling.

Description

Technical Field

[0001] The utility model belongs to the field of industrial by-product high-salt water treatment, and specifically relates to a device for directly resource-processing industrial by-product high-salt water. Background Art

[0002] In 2030, my country's chemical output value will account for half of the world's total. While the development of the chemical industry has brought huge benefits to mankind, it also poses a potential huge environmental risk. The production of chemicals such as non-ferrous metal smelting, power battery production and recycling, coal chemical industry, and chemical raw material synthesis will produce a large amount of industrial by-product high-salt water. During industrial water treatment, the acid and alkali reagents added to the industrial wastewater to be treated will eventually be converted into salt, and then industrial water treatment will also produce industrial by-product high-salt water.

[0003] Conventionally, these industrial by-product high-salt waters are usually treated by concentrating and crystallizing them to obtain industrial by-product salts, which are then purified and recycled. The concentration and crystallization process of industrial by-product high-salt water requires evaporation of a large amount of water, which consumes a lot of energy, making the entire industrial by-product high-salt water treatment process very uneconomical. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned problems existing in the prior art, and to provide a device for directly recycling industrial by-product high-salt water, which uses a bipolar electrodialysis device to obtain acid solution and alkaline solution respectively from the second-pass purified brine, and directly recycles the industrial by-product high-salt water for industrial production and industrial water treatment, saving transportation costs and thus improving the production costs of enterprises.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a device for directly recycling industrial by-product high-salt water, comprising: a first purification unit, a second purification unit and a bipolar membrane electrodialysis device;

[0006] The first purification unit includes an organic matter removal device, a chlorine removal device, a nitrate removal device and a pH adjustment device in sequence;

[0007] The second purification unit is a chelating resin tower;

[0008] The pH adjusting device is connected to the chelating resin tower and the bipolar membrane electrodialysis device in sequence;

[0009] The pH adjusting device is an alkali adjusting tank; the pH adjusting device is used to add at least one of calcium hydroxide, sodium hydroxide and carbonate solution into the alkali adjusting tank.

[0010] In the utility model, at least one of calcium hydroxide, sodium hydroxide and carbonate solution is added into the alkali adjustment tank to increase the pH value of water, which is helpful for the treatment of the next process.

[0011] The utility model adopts two purification units to purify industrial by-product high-salt water, and uses bipolar membrane electrodialysis to obtain acid solution and alkaline solution respectively from the two purified brine, so as to directly recycle the industrial by-product high-salt water, and obtain hydrochloric acid solution in the acid chamber and sodium hydroxide solution in the alkaline chamber in the bipolar membrane electrodialysis.

[0012] Optionally, the organic matter removal device is an oxidation tank.

[0013] Optionally, the organic matter removal device is used to add a hypochlorite solution, and utilize the oxidizing property of hypochlorite to oxidize the organic matter until carbon dioxide leaves the water body, thereby achieving oxidative removal of the organic matter.

[0014] Optionally, the dechlorination device is a reduction tank.

[0015] Optionally, the dechlorination device is used to add a sodium sulfite solution, and utilize the reducing property of sulfite to reduce the hypochlorite ions remaining in the water to chloride ions, so as to remove the residual hypochlorite ions in the water.

[0016] Optionally, the denitrification device is a sedimentation tank.

[0017] Optionally, the denitrification device is used to add a calcium salt solution to generate calcium sulfate precipitation to remove sulfate ions in the water, thereby achieving the removal of sulfate ions in the water.

[0018] Optionally, the bipolar membrane electrodialysis device (6) comprises a plurality of membranes and dialysis chambers, wherein the plurality of membranes comprises at least two bipolar membranes, at least one cation membrane and at least one anion membrane.

[0019] The utility model discloses a device for directly recycling industrial by-product high-salt water, which has low energy consumption and can directly produce acid solution and alkaline solution for recycling.

[0020] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0022] Figure 1 A schematic diagram of a device for directly recycling industrial by-product high-salt water according to the utility model is shown.

[0023] Description of Reference Numerals

[0024] Organic matter removal device-1; chlorine removal device-2; denitrification device-3; pH adjustment device-4; chelating resin tower-5; bipolar membrane electrodialysis device. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein.

[0026] Example 1

[0027] The present embodiment provides a device for directly recycling industrial by-product high-salt water, comprising: a first purification unit, a second purification unit and a bipolar membrane electrodialysis device 6; the first purification unit comprises an organic matter removal device 1, a chlorine removal device 2, a denitrification device 3 and a pH adjustment device 4 in sequence; the organic matter removal device 1 is an oxidation tank, and the organic matter removal device 1 is used to add a hypochlorite solution, the dechlorine removal device 2 is a reduction tank, and the dechlorine removal device 2 is used to add a sodium sulfite solution, the denitrification device 3 is a precipitation tank, and the denitrification device 3 is used to add a calcium salt solution, the pH adjustment device is an alkali adjustment tank, and the pH adjustment device is used to add at least one of calcium hydroxide, sodium hydroxide and carbonate solution into the alkali adjustment tank; the second purification unit is a chelating resin tower 5; the pH adjustment device 4 is connected to the chelating resin tower 5 and the bipolar membrane electrodialysis device 6 in sequence.

[0028] The method comprises the following steps: adding a hypochlorite solution to the industrial by-product high brine to remove organic matter in the industrial by-product high brine; adding a sulfite solution to the industrial by-product high brine to remove hypochlorite remaining in the industrial by-product high brine; adding a calcium salt solution to the industrial by-product high brine to form a precipitate to remove sulfate ions in the industrial by-product high brine, and filtering the supernatant to obtain denitrified brine; adjusting the pH value of the denitrified brine to be alkaline, adding a carbonate solution to the alkaline denitrified brine, and filtering the supernatant to obtain a first-stage purified brine; lowering the pH value of the first-stage purified brine with an acidic solution, and removing trace amounts of calcium and magnesium ions remaining in the first-stage purified brine through a chelating resin tower to obtain a second-stage purified brine; and using bipolar membrane electrodialysis to obtain an acid solution and an alkaline solution from the second-stage purified brine, thereby directly recycling the industrial by-product high brine.

[0029] The utility model has low energy consumption for the direct resource treatment of industrial by-product high-salt water and can directly produce acid solution and alkaline solution for recycling.

[0030] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A device for directly recycling industrial by-product high-salt water, characterized in that: include: A first purification unit, a second purification unit and a bipolar membrane electrodialysis device (6); The first purification unit comprises an organic matter removal device (1), a chlorine removal device (2), a nitrification device (3) and a pH adjustment device (4) in sequence; The second purification unit is a chelating resin tower (5); The pH adjusting device (4) is sequentially connected to a chelating resin tower (5) and a bipolar membrane electrodialysis device (6); The pH adjusting device (4) is an alkali adjusting tank; the pH adjusting device (4) is used to add calcium hydroxide, sodium hydroxide or carbonate solution into the alkali adjusting tank.

2. The device for directly recycling industrial by-product high-salt water according to claim 1, characterized in that: The organic matter removal device (1) is an oxidation tank.

3. The device for directly recycling industrial by-product high-salt water according to claim 2, characterized in that: The organic matter removal device (1) is used for adding hypochlorite solution.

4. The device for directly recycling industrial by-product high-salt water according to claim 1, characterized in that: The dechlorination device (2) is a reduction tank.

5. The device for directly recycling industrial by-product high-salt water according to claim 4 is characterized in that: The dechlorination device (2) is used to add sodium sulfite solution.

6. The device for directly recycling industrial by-product high-salt water according to claim 1, characterized in that: The denitrification device (3) is a sedimentation tank.

7. The device for directly recycling industrial by-product high-salt water according to claim 6, characterized in that: The denitrification device (3) is used to add a calcium salt solution.

8. The device for directly recycling industrial by-product high-salt water according to claim 1, characterized in that: The bipolar membrane electrodialysis device (6) comprises a plurality of membranes and a dialysis chamber, wherein the plurality of membranes comprises at least two bipolar membranes, at least one cation membrane and at least one cathodic membrane.

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