Activated carbon adsorption deodorization and in-situ regeneration treatment system for salt production brine

Abstract

The utility model discloses an activated carbon adsorption deodorization and in-situ regeneration treatment system for salt-making brine, characterized in that it comprises a waste liquid storage tank, an ozone generator, an ozone tail gas destruction device, a high-pressure fan, a brine feed temporary storage tank, an acid mixing tank, an activated carbon adsorption tower, an alkali mixing tank and a brine discharge temporary storage tank which are sequentially connected in series through a brine delivery pipe; the activated carbon adsorption tower is filled with activated carbon, and the bottom of the activated carbon adsorption tower is connected to an external water supply source through a cleaning water inlet pipe; the ozone generator is connected to the bottom of the activated carbon adsorption tower to transport ozone into the activated carbon adsorption tower; the ozone tail gas destruction device is connected to the top of the activated carbon adsorption tower to absorb and destroy the unreacted ozone in the activated carbon adsorption tower. The utility model has a simple process and convenient operation, and can not only realize the continuous and efficient deodorization of brine, but also can regenerate the activated carbon in-situ online, thereby greatly reducing the cost of brine deodorization.

Description

Technical Field

[0001] The utility model belongs to the technical field of salt making equipment, and in particular relates to an activated carbon adsorption deodorization and in-situ regeneration treatment system for salt making brine. Background Art

[0002] According to its source, edible salt can be divided into sea salt, lake salt and well salt. Due to its high quality, well salt has gradually become the mainstream raw salt product. At present, well salt accounts for the highest proportion in my country's edible salt product structure, reaching 87%. However, during the mining and production of well salt, due to the salt fields during the period of salt rock deposition and diagenesis, the salt ore layer contains some residual organic matter, including short-chain organic acid molecules and a small amount of hydrocarbon substances, which causes the brine and finished salt to have a strong odor. Therefore, in the production and processing of well salt, the brine needs to be deodorized.

[0003] In the prior art, the more mature brine deodorization methods include: baking method, oxidation-reduction method, macroporous resin adsorption method and aeration method. However, the above methods still have some defects, mainly manifested in: poor deodorization effect, unfriendly to the environment, residual harmful substances and high deodorization cost. In response to this, the applicant proposed an activated carbon adsorption deodorization system for salt-making brine to solve the above problems. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide an activated carbon adsorption deodorization and in-situ regeneration treatment system for salt-making brine, which has a simple process and is easy to operate. It can not only achieve continuous and efficient deodorization of brine, but also can regenerate the activated carbon in situ online, thereby greatly reducing the cost of brine deodorization.

[0005] The utility model is achieved through the following technical solutions.

[0006] The activated carbon adsorption deodorization and in-situ regeneration treatment system for salt-making brine is characterized in that it includes a waste liquid storage tank, an ozone generator, an ozone tail gas destruction device, a high-pressure fan, a brine feed temporary storage tank, an acid mixing tank, an activated carbon adsorption tower, an alkali mixing tank and a brine discharge temporary storage tank which are connected in series through a brine delivery pipe in sequence; the activated carbon adsorption tower is filled with activated carbon, and the bottom of the activated carbon adsorption tower is connected to an external water supply source through a cleaning water inlet pipe; the ozone generator is connected to the bottom of the activated carbon adsorption tower to transport ozone into the activated carbon adsorption tower; the ozone tail gas destruction device is connected to the top of the activated carbon adsorption tower to absorb and destroy the unreacted ozone in the activated carbon adsorption tower; the high-pressure fan is connected to the bottom and top of the activated carbon adsorption tower to blow a high-pressure airflow into the activated carbon adsorption tower to evenly mix the activated carbon and water in the activated carbon adsorption tower; the waste liquid storage tank is connected to the bottom of the activated carbon adsorption tower through a waste liquid recovery pipe.

[0007] Preferably, the system of the utility model further comprises an acid storage tank and an alkali storage tank, wherein the acid storage tank is connected to the acid mixing tank via an acid liquid delivery pipeline, and the alkali storage tank is connected to the alkali mixing tank and the bottom of the activated carbon adsorption tower via an alkali liquid delivery pipeline.

[0008] Preferably, precision filters are provided on the brine delivery pipes connecting the brine feed temporary storage tank and the acid mixing tank, and the brine discharge temporary storage tank and the alkali mixing tank.

[0009] Preferably, the acid mixing tank is connected to the top and bottom of the activated carbon adsorption tower through a brine delivery pipe.

[0010] Preferably, both the acid mixing tank and the alkali mixing tank are provided with stirring devices.

[0011] Preferably, both the acid mixing tank and the alkali mixing tank are provided with a pH meter.

[0012] Preferably, a brine recovery pipe is connected between the brine delivery pipe connected between the activated carbon adsorption tower and the brine discharge temporary storage tank and the waste liquid recovery pipe.

[0013] Preferably, a first valve is provided on the brine recovery pipe, a second valve and a third valve are provided at the upstream end and the upstream end of the waste liquid recovery pipe, respectively, and a fourth valve and a fifth valve are provided at the upstream end and the upstream end of the brine delivery pipe connected between the activated carbon adsorption tower and the brine discharge temporary storage tank, respectively.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1) The utility model is used to deodorize brine, which has the advantages of simple operation, safe and environmentally friendly production process, no wastewater and waste gas discharge, low investment, low production cost, and the finished edible salt produced from the treated brine has a white appearance with a whiteness of more than 85%, no peculiar smell, and representative peculiar smell substances such as isovaleric acid and butyric acid are not detected, and all indicators meet national standards.

[0016] 2) The utility model can utilize ozone to regenerate activated carbon under alkaline conditions, which can not only avoid the loss of activated carbon caused by high-temperature burning in other regeneration methods, but also prevent any harmful substances from remaining. In addition, the activated carbon is regenerated in situ using the same set of equipment, and the activated carbon does not need to be transferred, which makes the operation more convenient, the regeneration and activation time is short, and the efficiency is higher. According to tests, the activated carbon adsorption capacity after 7 regenerations can still reach about 50% of the first use, thereby greatly reducing the amount of activated carbon used in brine deodorization, which has significant economic benefits for the salt production industry with meager profits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] The meanings of the symbols in the above figure are: feed temporary storage tank 1, acid mixing tank 2, activated carbon adsorption tower 3, alkali mixing tank 4, brine discharge temporary storage tank 5, ozone generator 6, ozone tail gas destruction device 7, high-pressure fan 8, brine delivery pipe 9, fourth valve 901, fifth valve 902, waste liquid storage tank 10, pH meter 11, waste liquid recovery pipe 12, second valve 1201, third valve 1202, acid storage tank 13, alkali storage tank 14, acid liquid delivery pipeline 15, alkali liquid delivery pipeline 16, precision filter 17, stirring device 18, cleaning water inlet pipe 19, brine recovery pipe 20, first valve 2001. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] Example 1

[0022] The activated carbon adsorption deodorization and in-situ regeneration treatment system for salt-making brine comprises a waste liquid storage tank 10, an ozone generator 6, an ozone tail gas destruction device 7, a high-pressure blower 8, a brine feed temporary storage tank 1, an acid mixing tank 2, an activated carbon adsorption tower 3, an alkali mixing tank 4 and a brine discharge temporary storage tank 5 which are connected in series through a brine delivery pipe 9 in sequence; the activated carbon adsorption tower 3 is filled with activated carbon, and the bottom of the activated carbon adsorption tower 3 is connected to an external water supply source through a cleaning water inlet pipe 19; the ozone generator 6 is connected to the activated carbon adsorption tower 3, and the activated carbon adsorption tower 3 is connected to the external water supply source through a cleaning water inlet pipe 19; the activated carbon adsorption tower 3 is filled with activated carbon, and the bottom of the activated carbon adsorption tower 3 is connected to the external water supply source through a cleaning water inlet pipe 19; the activated carbon adsorption tower 3 is connected to the activated carbon adsorption tower 3, and ... activated carbon adsorption tower 3, and the activated carbon adsorption tower 3 is connected to the activated carbon adsorption tower 3, and the The bottom of the activated carbon adsorption tower 3 is connected to transport ozone into the activated carbon adsorption tower 3; the ozone tail gas destruction device 7 is connected to the top of the activated carbon adsorption tower 3 to absorb and destroy the unreacted ozone in the activated carbon adsorption tower 3; the high-pressure fan 8 is connected to the bottom and top of the activated carbon adsorption tower 3 to blow high-pressure air into the activated carbon adsorption tower 3 to evenly mix the activated carbon and water in the activated carbon adsorption tower 3; the waste liquid storage tank 10 is connected to the bottom of the activated carbon adsorption tower 3 through the waste liquid recovery pipe 12.

[0023] In order to facilitate the addition of acid into the acid mixing tank 2 and the addition of alkali into the alkali mixing tank 4 to adjust the pH of the brine, further, in a preferred embodiment, the system of the utility model also includes an acid storage tank 13 and an alkali storage tank 14, the acid storage tank 13 is connected to the acid mixing tank 2 through an acid liquid delivery pipeline 15, and the alkali storage tank 14 is connected to the alkali mixing tank 4 and the bottom of the activated carbon adsorption tower 3 through an alkali liquid delivery pipeline 16.

[0024] Furthermore, in a preferred embodiment, precision filters 17 are provided on the brine delivery pipes 9 connecting the brine feed temporary storage tank 1 and the acid mixing tank 2 and the alkali mixing tank 4 and the brine discharge temporary storage tank 5 .

[0025] Furthermore, in a preferred embodiment, the acid mixing tank 2 is connected to the top and bottom of the activated carbon adsorption tower 3 through the brine delivery pipe 9; specifically, the brine delivery pipe 9 is provided with a valve at one end connected to the top and bottom of the activated carbon adsorption tower 3; therefore, it is possible to choose to feed from the top, the top, or the top and the bottom of the activated carbon adsorption tower 3 at the same time as needed.

[0026] Furthermore, in a preferred embodiment, both the acid mixing tank 2 and the alkali mixing tank 4 are provided with a stirring device 18; the stirring device is a stirring device commonly used in the chemical industry, which includes a driving motor and a stirring paddle arranged in the tank; the stirring of the stirring device 18 can accelerate the mixing speed of the acid solution or alkali solution and the brine, and ensure that the acid solution or alkali solution and the brine are mixed evenly.

[0027] In order to facilitate intuitive observation of the pH of the brine in the acid mixing tank 2 and the alkali mixing tank 4 , further, in a preferred embodiment, a pH meter 11 is provided on the acid mixing tank 2 and the alkali mixing tank 4 .

[0028] Furthermore, in a preferred embodiment, a brine recovery pipe 20 is connected between the brine delivery pipe 9 connected between the activated carbon adsorption tower 3 and the brine discharge temporary storage tank 5 and the waste liquid recovery pipe 12, so that when the brine does not meet the deodorization requirements, the brine can be directly discharged into the waste liquid storage tank 10 through the brine recovery pipe 20 and the waste liquid recovery pipe 12.

[0029] In order to facilitate the control of the flow direction of the brine discharged from the activated carbon adsorption tower 3, further, in a preferred embodiment, a first valve 2001 is provided on the brine recovery pipe 20, and a second valve 1201 and a third valve 1202 are respectively provided at the upstream end and the downstream end of the waste liquid recovery pipe 12, and a fourth valve 901 and a fifth valve 902 are respectively provided at the upstream end and the upstream end of the brine delivery pipe 9 connected between the activated carbon adsorption tower 3 and the brine discharge temporary storage tank 5; for example, under normal processes, the fourth valve 901 and the fifth valve 902 are opened, and the first valve 2001 is closed, so that the deodorized brine that passes the deodorization can be sent to the brine discharge temporary storage tank 5; and under abnormal processes, if the brine deodorization fails to pass the test, the fourth valve 901, the third valve 1202 and the first valve 2001 can be opened, and the second valve 1201 and the fifth valve 902 can be closed to send the brine to the waste liquid storage tank 10.

[0030] Based on the above structure, the working principle of the utility model is as follows:

[0031] 1. Brine deodorization: The original brine enters the precision filter 17 from the brine feed temporary storage tank 1 to remove insoluble impurities, and then is transported to the acid mixing tank 2 through the brine delivery pipe 9. The acid storage tank 13 is used to add acid to the brine in the acid mixing tank 2 through the acid delivery pipe 15 to adjust the pH of the brine to 4-5 to acidify the brine; the acidified brine is pumped from the acid mixing tank 2 into the bottom of the activated carbon adsorption tower 3, and the acidified brine passes through the activated carbon layer to adsorb and remove odorous substances and other organic impurities such as short-chain alkanes, wherein the activated carbon is selected from 30-80 mesh wood activated carbon. ; The deodorized brine is discharged from the top of the activated carbon adsorption tower 3 through the brine delivery pipe 9 and then enters the alkali mixing tank 4. The alkali storage tank 14 is used to add concentrated alkali with a mass concentration of 32% to the alkali mixing tank 4 through the alkali liquid delivery pipe 16 to adjust the pH of the deodorized brine to 6-7; thereafter, the deodorized brine is sent from the alkali mixing tank 4 to the precision filter 17 to remove impurities, such as activated carbon that has run away, and then is transported to the brine discharge temporary storage tank 5 through the brine delivery pipe 9, thus completing the brine deodorization process; the brine in the brine discharge temporary storage tank 5 can be sent to the purification tank to complete the subsequent salt making process;

[0032] 2. In-situ regeneration: After the activated carbon has been used for many times and its adsorption performance has dropped significantly, the clean water of the same volume as the activated carbon can be directly pumped into the activated carbon adsorption tower 3 by using the cleaning water inlet pipe 19, and then the high-pressure blower 8 is used to blow high-pressure airflow into the activated carbon adsorption tower 3 to mix the activated carbon in the activated carbon adsorption tower 3 with water evenly, and then the washing water is discharged into the waste liquid storage tank 10 through the waste liquid recovery pipe 12. The operation is repeated twice to remove the salt in the activated carbon by water washing, especially to remove the chloride ions in the activated carbon, to prevent the activated carbon from being oxidized to chlorite and chlorate by the introduction of ozone in the next step; then, a NaOH solution with a mass concentration of 0.5% of the same volume as the activated carbon is added into the activated carbon adsorption tower 3 through the alkali storage tank 14, Afterwards, ozone is produced by the ozone generator 6, and ozone is blown into the bottom of the activated carbon adsorption tower. The ozone introduction amount is controlled to be 5 mg / L / min, and the ozone introduction time is 30 minutes, so that the ozone reacts under alkaline conditions; the unreacted ozone enters the ozone tail gas destruction device 7 from the top of the adsorption tower; then, the alkaline water in the activated carbon adsorption tower 3 is discharged into the waste liquid storage tank 10; thereafter, the activated carbon in the activated carbon adsorption tower 3 is washed twice again according to the above operation, and the washing water is discharged into the waste liquid temporary storage tank, that is, the in-situ regeneration operation of the activated carbon is completed, and the activated carbon after in-situ regeneration can continue to be used for the deodorization of the next batch of brine; the pH of the waste liquid in the temporary storage tank is adjusted to neutral, and it can be pumped into the brine mining well for brine mining.

Claims

1. An activated carbon adsorption deodorization and in-situ regeneration treatment system for salt-making brine, characterized in that: It includes a waste liquid storage tank, an ozone generator, an ozone tail gas destruction device, a high-pressure fan, a brine feed temporary storage tank, an acid mixing tank, an activated carbon adsorption tower, an alkali mixing tank and a brine discharge temporary storage tank which are connected in series through a brine delivery pipe in sequence; the activated carbon adsorption tower is filled with activated carbon, and the bottom of the activated carbon adsorption tower is connected to an external water supply source through a cleaning water inlet pipe; the ozone generator is connected to the bottom of the activated carbon adsorption tower to transport ozone into the activated carbon adsorption tower; The ozone tail gas destruction device is connected to the top of the activated carbon adsorption tower to absorb and destroy the unreacted ozone in the activated carbon adsorption tower; the high-pressure fan is connected to the bottom and top of the activated carbon adsorption tower to blow high-pressure air into the activated carbon adsorption tower to evenly mix the activated carbon and water in the activated carbon adsorption tower; the waste liquid storage tank is connected to the bottom of the activated carbon adsorption tower through a waste liquid recovery pipe.

2. The activated carbon adsorption deodorization and in-situ regeneration treatment system for salt production brine according to claim 1, characterized in that: It also includes an acid storage tank and an alkali storage tank. The acid storage tank is connected to the acid mixing tank through an acid liquid delivery pipeline, and the alkali storage tank is connected to the alkali mixing tank and the bottom of the activated carbon adsorption tower through an alkali liquid delivery pipeline.

3. The activated carbon adsorption deodorization and in-situ regeneration treatment system for salt production brine according to claim 2, characterized in that: Precision filters are provided on the brine delivery pipes connecting the brine feed temporary storage tank and the acid mixing tank, and on the brine delivery pipes connecting the alkali mixing tank and the brine discharge temporary storage tank.

4. The activated carbon adsorption deodorization and in-situ regeneration treatment system for salt production brine according to claim 1, characterized in that: The acid mixing tank is communicated with the top and the bottom of the activated carbon adsorption tower through a brine delivery pipe.

5. The activated carbon adsorption deodorization and in-situ regeneration treatment system for salt production brine according to claim 1, characterized in that: The acid mixing tank and the alkali mixing tank are both provided with stirring devices.

6. The activated carbon adsorption deodorization and in-situ regeneration treatment system for salt production brine according to claim 1, characterized in that: The acid mixing tank and the alkali mixing tank are both provided with pH meters.

7. The activated carbon adsorption deodorization and in-situ regeneration treatment system for salt production brine according to claim 1, characterized in that: A brine recovery pipe is connected between the brine delivery pipe connected between the activated carbon adsorption tower and the brine discharge temporary storage tank and the waste liquid recovery pipe.

8. The activated carbon adsorption deodorization and in-situ regeneration treatment system for salt production brine according to claim 7, characterized in that: A first valve is provided on the brine recovery pipe, a second valve and a third valve are provided at the upstream end and the upstream end of the waste liquid recovery pipe respectively, and a fourth valve and a fifth valve are provided at the upstream end and the upstream end of the brine delivery pipe connected between the activated carbon adsorption tower and the brine discharge temporary storage tank respectively.

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