CN217025650U - Device system for treating vitamin B6 production wastewater through membrane separation - Google Patents
Device system for treating vitamin B6 production wastewater through membrane separation Download PDFInfo
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Abstract
The utility model relates to a device system for treating vitamin B6 production wastewater through membrane separation, which comprises a pre-filtering device, a nano-filtering device, a decoloring device, a crystallizing device and a centrifuging device which are connected in sequence; and a filtrate outlet of the centrifugal device is connected with a material inlet of the pre-filtering device. The device system provided by the utility model treats the vitamin B6 production wastewater through the nanofiltration membrane without using a microfiltration membrane and an ultrafiltration membrane, and effectively reduces the influence of the vitamin B6 production wastewater on the environment and reduces the energy consumption and the operation cost through the reasonable arrangement of the connection relation between the devices; moreover, the device system can realize the efficient recovery of vitamin B6 in the vitamin B6 production wastewater, and is an ideal device system for the vitamin B6 production wastewater.
Description
Technical Field
The utility model belongs to the technical field of wastewater treatment, relates to a wastewater treatment device system, and particularly relates to a device system for treating vitamin B6 production wastewater through membrane separation.
Background
The vitamin B6 is obtained by evaporating, crystallizing and separating the secondary mother liquor obtained by filtering the primary crystallization during the production process, wherein the separated liquid still contains 2-5 wt% of vitamin B6.
Generally, production enterprises discharge liquid separated by secondary crystallization into a sewage treatment system, but the COD concentration in the wastewater produced by vitamin B6 exceeds 20 ten thousand mg/L, and the wastewater contains hydrochloric acid, acetic acid, phosphoric acid and the like, so that the pH value of the aqueous solution is less than 1, the acidity is extremely strong, anaerobic bacteria and aerobic bacteria are inactivated, and the biochemical sewage treatment system is difficult to bear. Therefore, in order to ensure the continuity of operation, manufacturers have to choose to incinerate the waste water from vitamin B6 production as hazardous waste, which increases the amount of hazardous waste, wastes energy, and causes environmental damage due to the emission of VOCs and greenhouse gases.
CN 102329048A discloses a treatment method of chemically synthesized vitamin B6 wastewater, which comprises the following steps: desalting the wastewater by a triple-effect reduced pressure evaporator and treating the wastewater by an iron-carbon micro-electrolysis oxidation method; entering a UASB anaerobic reactor for anaerobic biochemical treatment; and (4) the wastewater enters a jet aeration tank for aerobic biochemical treatment, and supernatant reaches the standard and is discharged after sludge-water separation in a sedimentation tank. The vitamin B6 production wastewater is treated by a multi-effect evaporation-iron-carbon micro-electrolysis-upflow anaerobic sludge blanket UASB-jet aerator process, so that index concentrations of COD, chroma and the like of the treated wastewater meet the requirements of 'discharge standards of water pollutants for chemical synthesis pharmaceutical industry', but vitamin B6 in the wastewater cannot be recovered.
Therefore, it is necessary to provide a device system for vitamin B6 production wastewater, which can reduce the amount of dangerous waste, reduce the environmental impact, reduce the operation cost and recover the vitamin B6 product.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, the utility model provides a device system for treating vitamin B6 production wastewater through membrane separation, which does not need too many membrane separation devices, not only reduces the influence of wastewater treatment on the environment, but also reduces the energy consumption and the operation cost through the reasonable arrangement of the connection relationship between the devices, and can realize the recycling of vitamin B6 in the vitamin B6 production wastewater.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a device system for treating vitamin B6 production wastewater through membrane separation, which comprises a pre-filtering device, a nano-filtering device, a decoloring device, a crystallizing device and a centrifuging device which are connected in sequence;
and a filtrate outlet of the centrifugal device is connected with a material inlet of the pre-filtering device.
When the device system provided by the utility model is used for treating the vitamin B6 production wastewater, the vitamin B6 production wastewater is filtered in the pre-filtering device to remove insoluble suspended matters, the filtrate enters the nano-filtering device and is subjected to separation treatment by the nano-filtering device to realize separation of macromolecular organic matters such as vitamin B6 and the like, so that the COD (chemical oxygen demand) is less than or equal to 3.5 multiplied by 104The filtrate of mg/L and COD are more than or equal to 4.0X 105mg/L of concentrated solution.
The nanofiltration device used according to the utility model has a molecular weight cut-off of 100 and 300 dalton, which may be, for example, 100 dalton, 150 dalton, 200 dalton, 250 dalton or 300 dalton, but is not limited to the values listed, and other values not listed in the range of values are equally suitable. The utility model can realize the interception and filtration of the wastewater produced by the microorganism B6 by adopting the nanofiltration device with the interception molecular weight of 100-300 daltons for nanofiltration, so that the interception rate of the vitamin B6 is more than or equal to 98 percent, and no pre-treatment processes such as microfiltration, ultrafiltration and the like are needed.
The nanofiltration membrane in the nanofiltration device is an acid-resistant nanofiltration membrane, the acidity of the vitamin B6 production wastewater is strong, and the pH is less than 2.
The acid-proof nanofiltration membrane comprises but is not limited to Koch-MPS-34 series nanofiltration membranes.
The filtrate is discharged to a factory wastewater treatment unit, COD of the filtrate is reduced to the wastewater discharge standard, the filtrate enters a wastewater treatment plant for treatment, concentrated solution enters a decoloring device for decoloring treatment, the decolored liquid enters a crystallizing device for crystallization, crystallized magma enters a centrifugal device for centrifugal separation, the recovery of vitamin B6 is realized, centrifugal mother liquor is mixed with vitamin B6 production wastewater for circular treatment, and the treatment of vitamin B6 production wastewater and the recovery of vitamin B6 are realized.
Preferably, a first material conveying device is arranged between the pre-filtering device and the nano-filtering device.
Preferably, the first material conveying means comprises a high pressure pump.
The high-pressure pump is arranged between the pre-filtering device and the nanofiltration device, so that the pressure required by the nanofiltration device is ensured.
Preferably, the pre-filtering device is provided with a second material conveying device in front.
And a filtrate outlet of the centrifugal device is connected with a material inlet of the second material conveying device.
The second material conveying device of the present invention includes, but is not limited to, a feeding pump conventional in the art as long as the conveying of the liquid material can be achieved, and the feeding pump includes any one of a centrifugal pump, a diaphragm pump or a plunger pump, for example.
Preferably, the pre-filtering device comprises any one of a filter bag, a filter element, a filter cloth or a tube filter.
According to the utility model, by arranging the pre-filtering device, large-particle substances, colloids and other insoluble substances in the vitamin B6 production wastewater can be removed, so that the subsequent nanofiltration device can stably operate.
Preferably, the prefiltration means has a filtration precision of 5 to 50 μm, which may be, for example, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm, but is not limited to the values listed, and other values not listed in the numerical range are equally applicable.
Preferably, the decoloring apparatus comprises an adsorption decoloring apparatus.
The utility model uses an adsorption decoloring device to remove colored impurities in the concentrated solution, and the adsorbent in the adsorption decoloring device comprises but is not limited to activated carbon conventional in the field.
The concentrated solution obtained by the nanofiltration device contains not only vitamin B6 but also colored impurities such as tar and the like generated by high-temperature reaction. The acting force of the colored impurities and the active carbon is strong, thereby realizing the decolorization of the nanofiltration concentrated solution.
Preferably, the crystallization device comprises an evaporative crystallizer or a cooled crystallizer.
Preferably, the crystallization device is a cooling crystallizer.
Illustratively, the method for treating the vitamin B6 production wastewater by using the device system comprises the following steps:
sequentially carrying out pre-filtration treatment, nanofiltration treatment, decoloring treatment, crystallization treatment and centrifugation treatment on the vitamin B6 production wastewater to obtain centrifugal mother liquor and vitamin B6; the centrifugal mother liquor is reused for mixing with the vitamin B6 production wastewater.
The precision of the pre-filtration treatment is 5 to 50 μm, and may be, for example, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm, but is not limited to the values recited, and other values not recited in the numerical ranges are equally applicable.
The nanofiltration treatment may have a pressure difference across the membrane of 1 to 5MPa, for example 1MPa, 1.5MPa, 2MPa, 2.5MPa, 3MPa, 3.5MPa, 4MPa, 4.5MPa or 5MPa, but is not limited to the values listed and other values not listed within the range of values are equally applicable.
The nanofiltration treatment is carried out at a temperature of 70 ℃ or less, and may be, for example, 20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃ or 70 ℃, but is not limited to the values listed, and other values not listed within the numerical range are equally applicable, preferably 40 to 70 ℃.
The temperature of the decoloring treatment is 0 to 80 ℃, and may be, for example, 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃ or 80 ℃, but is not limited to the enumerated values, and other values not enumerated within the numerical range are also applicable.
The temperature of the crystallization treatment is 10 ℃ or lower, and may be, for example, 0 ℃, 3 ℃, 5 ℃, 6 ℃, 8 ℃ or 10 ℃, but is not limited to the values listed, and other values not listed in the numerical range are also applicable, and preferably 0 to 5 ℃.
The utility model treats the components of the vitamin B6 production wastewater: the mass percent of the vitamin B6 is 2.5-3.5 wt%, and the COD is more than or equal to 1.5 multiplied by 105mg/L, total nitrogen is more than or equal to 1.0 multiplied by 104mg/L, ammonia nitrogen is more than or equal to 5000mg/L, Cl-The content is 5 x 104-8×104mg/L, pH value<2。
The COD of the vitamin B6 production wastewater treated by the method is more than or equal to 1.5 multiplied by 105mg/L, for example, may be 1.5X 105mg/L、1.6×105mg/L、1.7×105mg/L、1.8×105mg/L、1.9×105mg/L、2×105mg/L、2.1×105mg/L、2.4×105mg/L、2.5×105mg/L、2.7×105mg/L、2.8×105mg/L、3×105mg/L or 3.5X 105mg/L, but is not limited to the values recited, and other values within the range are equally applicable.
COD in the filtrate generated by nanofiltration treatment is less than or equal to 3.5 multiplied by 104mg/L may be, for example, 1X 104mg/L、1.5×104mg/L、2×104mg/L、2.5×104mg/L、3×104mg/L or 3.5X 104mg/L, but is not limited to the values recited, and other values within the range are equally applicable.
In the concentrated solution generated by nanofiltration treatment, COD is more than or equal to 4.0 multiplied by 105mg/L, for example, may be 4X 105mg/L、4.2×105mg/L、4.5×105mg/L、4.8×105mg/L or 5X 105mg/L, but is not limited to the values recited, and other values within the range are equally applicable.
Compared with the prior art, the utility model at least has the following beneficial effects:
the membrane separation is a technology for selective separation by utilizing different molecular sizes, and can be classified into microfiltration, ultrafiltration, nanofiltration and reverse osmosis according to the pore size of the membrane; the device system provided by the utility model uses the nanofiltration device, and the influence on the environment is effectively reduced and the energy consumption and the operation cost are reduced through the reasonable arrangement of the connection relation between the devices; moreover, the device system can also realize the high-efficient recovery of vitamin B6 in the acidic vitamin B6 production wastewater.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus system provided by the present invention.
In the figure: 1, a second material conveying device; 2, a pre-filtering device; 3, a first material conveying device; 4, a nanofiltration device; 41, filtrate; 5, a decoloring device; 6, a crystallization device; 7, a centrifugal device.
Detailed Description
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the appended claims.
To better illustrate the utility model and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the utility model are as follows:
example 1
The present embodiment provides an apparatus system for treating vitamin B6 production wastewater by membrane separation as shown in fig. 1, the apparatus system comprising a pre-filtering apparatus 2, a nano-filtering apparatus 4, a decoloring apparatus 5, a crystallizing apparatus 6, and a centrifuging apparatus 7 connected in series; the filtrate outlet of the centrifugal device 7 is connected with the material inlet of the pre-filtering device 2.
The filtering precision of the filter element used by the pre-filtering device is 5 mu m.
A first material conveying device 3 is arranged between the pre-filtering device 2 and the nano-filtering device 4, and the first material conveying device 3 is a high-pressure pump.
A second material conveying device 1 is arranged in front of the pre-filtering device 2, and a filtrate outlet of the centrifugal device 7 is connected with a material inlet of the second material conveying device 1; the second material conveying device 1 is a centrifugal pump.
The nanofiltration membrane in the nanofiltration device 4 is an acid-resistant nanofiltration membrane KOCH-MPS-34, and the molecular weight cutoff is 200 daltons.
The decoloring device 5 is an activated carbon decoloring device 5; the crystallization device 6 is a cooling crystallizer.
When the device system provided by the embodiment is used for treating the vitamin B6 production wastewater, the vitamin B6 production wastewater is filtered in the pre-filtering device 2 to remove insoluble suspended matters; the filtrate 41 enters a nanofiltration device 4, and is separated by the nanofiltration device 4 to realize the separation of macromolecular organic matters such as vitamin B6, and the like, thereby obtaining the product with COD less than or equal to 3.5 multiplied by 104mg/L of filtrate 41 and COD of 4.0X 10 or more5mg/L of concentrated solution. The filtrate 41 is discharged to an anaerobic treatment unit, COD of the filtrate is reduced to the wastewater discharge standard, the filtrate enters a wastewater treatment plant for treatment, concentrated solution enters a decolorization device 5 for adsorption decolorization by activated carbon, decolorized liquid enters a crystallization device 6 for crystallization, crystallized magma enters a centrifugal device 7 for centrifugal separation, recovery of vitamin B6 is realized, centrifugal mother liquor is mixed with vitamin B6 production wastewater for circulation treatment, and treatment of vitamin B6 production wastewater and recovery of vitamin B6 are realized.
Example 2
This example provides a membrane separation apparatus system for treating vitamin B6 wastewater, which is the same as that of example 1 except that the filtration precision of the filter element used in the pre-filtration apparatus 2 is 20 μm.
Example 3
This example provides a membrane separation apparatus for treating vitamin B6 wastewater, which is the same as that of example 1 except that the pre-filter 2 uses a filter element having a filtration accuracy of 50 μm.
Example 4
This example provides a membrane separation apparatus for treating vitamin B6 production wastewater, which is the same as in example 1 except that the nanofiltration apparatus 2 has a molecular weight cut-off of 300 dalton.
Example 5
This example provides a membrane separation apparatus for treating vitamin B6 wastewater, which is the same as in example 1 except that the nanofiltration apparatus 4 has a molecular weight cut-off of 500 dalton.
Comparative example 1
The comparative example provides a device system for treating vitamin B6 production wastewater by membrane separation, which is the same as that in example 1 except that the nanofiltration membrane in the nanofiltration device 4 is a common nanofiltration membrane with the molecular weight cutoff of 200 daltons.
Because the acid-resistant nanofiltration membrane is replaced by the common nanofiltration membrane in the comparative example, the separation layer on the surface of the membrane is decomposed in a strong acid medium, so that the membrane performance is deteriorated, and the rejection rate is reduced.
Application example 1
The application example provides a method for treating vitamin B6 production wastewater by using the device system provided in example 1, wherein the vitamin B6 production wastewater comprises the following steps: 3 wt% of vitamin B6, 2.1X 105COD of mg/L, 1.4X 104Total nitrogen of mg/L, ammonia nitrogen of 5500mg/L and 7 x 104mg/L Cl-。
The method comprises the following steps:
sequentially carrying out pre-filtration treatment, nanofiltration treatment, decoloration treatment, crystallization treatment and centrifugation treatment on the vitamin B6 production wastewater to obtain centrifugal mother liquor and vitamin B6; the centrifugal mother liquor is reused for mixing with the vitamin B6 production wastewater;
the transmembrane pressure difference of nanofiltration treatment is 5Mpa, and the temperature is 60 ℃;
the temperature of the decoloring treatment is 60 ℃;
the temperature of the crystallization treatment was 5 ℃.
In the application example, the COD of the filtrate generated by nanofiltration treatment is less than or equal to 3.5 multiplied by 104mg/L, concentrated solution COD is more than or equal to 4.0 multiplied by 105mg/L, the purity of the recovered vitamin B6 was 99.3%, and the recovery rate of vitamin B6 was 91.4%.
Application example 2
The present application example providesA method for treating wastewater from vitamin B6 production using the system of apparatus provided in example 1, wherein the wastewater from vitamin B6 production comprises: 3.0 wt% of vitamin B6, 2.1X 105COD of mg/L, 1.4X 104Total nitrogen of mg/L, ammonia nitrogen of 5500mg/L and 7 multiplied by 104mg/L of Cl-。
The method comprises the following steps:
sequentially carrying out pre-filtration treatment, nanofiltration treatment, decoloring treatment, crystallization treatment and centrifugation treatment on the vitamin B6 production wastewater to obtain centrifugal mother liquor and vitamin B6; the centrifugal mother liquor is reused for mixing with the vitamin B6 production wastewater;
the transmembrane pressure difference of nanofiltration treatment is 3Mpa, and the temperature is 50 ℃;
the temperature of the decoloring treatment is 50 ℃.
The temperature of the crystallization treatment was 3 ℃.
In the application example, the COD of the filtrate generated by nanofiltration treatment is less than or equal to 3.5 multiplied by 104mg/L, concentrated solution COD is more than or equal to 4.0 multiplied by 105mg/L, the purity of the recovered vitamin B6 is 99.1%, and the recovery rate of vitamin B6 is 93.2%.
Application example 3
The application example provides a method for treating vitamin B6 production wastewater by using the device system provided in example 1, wherein the vitamin B6 production wastewater comprises the following steps: 3 wt% of vitamin B6, 2.1X 105COD of mg/L, 1.38X 105Total nitrogen of mg/L, ammonia nitrogen of 5700mg/L and 7 multiplied by 104mg/L Cl-。
The method comprises the following steps:
sequentially carrying out pre-filtration treatment, nanofiltration treatment, decoloration treatment, crystallization treatment and centrifugation treatment on the vitamin B6 production wastewater to obtain centrifugal mother liquor and vitamin B6; the centrifugal mother liquor is reused for mixing with the vitamin B6 production wastewater;
the transmembrane pressure difference of the nanofiltration treatment is 1Mpa, and the temperature is 40 ℃;
the temperature of the decoloring treatment is 30 ℃;
the temperature of the crystallization treatment was 0 ℃.
In this application, naThe COD of the filtrate generated by the filtration treatment is less than or equal to 3.5 multiplied by 104mg/L, concentrated solution COD is more than or equal to 4.0 multiplied by 105mg/L, the purity of the recovered vitamin B6 is 99.2%, and the recovery rate of vitamin B6 is 94.2%.
Application example 4
The application example provides a method for treating vitamin B6 production wastewater by using the device system provided in the application example 1, and the method is the same as the application example 1 except that the temperature of nanofiltration treatment is 30 ℃.
In the application example, the COD of the filtrate generated by nanofiltration treatment is less than or equal to 3.5 multiplied by 104mg/L, concentrated solution COD is more than or equal to 4.0 multiplied by 105mg/L, the purity of the recovered vitamin B6 is 99.2%, and the recovery rate of vitamin B6 is 90.1%.
Application example 5
The application example provides a method for treating vitamin B6 production wastewater by using the device system provided in the application example 1, and the method is the same as the application example 1 except that the temperature of nanofiltration treatment is 80 ℃.
In the application example, the COD of the filtrate generated by nanofiltration treatment is less than or equal to 3.5 multiplied by 104mg/L, concentrated solution COD is more than or equal to 4.0 multiplied by 105mg/L, the purity of the recovered vitamin B6 is 98.9 percent, and the recovery rate of vitamin B6 is 88.4 percent.
Application example 6
The application example provides a method for treating vitamin B6 production wastewater by using the device system provided by the embodiment 2, wherein the vitamin B6 production wastewater comprises the following steps: 3 wt% of vitamin B6, 2.1X 105COD of mg/L, 1.38X 105Total nitrogen of 5700mg/L and 7X 104mg/L of Cl-。
The method comprises the following steps:
sequentially carrying out pre-filtration treatment, nanofiltration treatment, decoloration treatment, crystallization treatment and centrifugation treatment on the vitamin B6 production wastewater to obtain centrifugal mother liquor and vitamin B6; the centrifugal mother liquor is reused for mixing with the vitamin B6 production wastewater;
the transmembrane pressure difference of the nanofiltration treatment is 5Mpa, and the temperature is 60 ℃;
the temperature of the decoloring treatment is 60 ℃;
the temperature of the crystallization treatment was 5 ℃.
In the application example, the COD of the filtrate generated by nanofiltration treatment is less than or equal to 3.5 multiplied by 104mg/L, concentrated solution COD is more than or equal to 4.0 multiplied by 105mg/L, the purity of the recovered vitamin B6 is 99.2%, and the recovery rate of vitamin B6 is 90.3%.
Application example 7
The application example provides a method for treating vitamin B6 production wastewater by using the device system provided by the embodiment 3, wherein the vitamin B6 production wastewater comprises the following steps: 3 wt% of vitamin B6, 2.1X 105COD of mg/L, 1.38X 105Total nitrogen of 5700mg/L and 7X 104mg/L Cl-。
The method comprises the following steps:
sequentially carrying out pre-filtration treatment, nanofiltration treatment, decoloring treatment, crystallization treatment and centrifugation treatment on the vitamin B6 production wastewater to obtain centrifugal mother liquor and vitamin B6; the centrifugal mother liquor is reused for mixing with the vitamin B6 production wastewater;
the transmembrane pressure difference of the nanofiltration treatment is 5Mpa, and the temperature is 60 ℃;
the temperature of the decoloring treatment is 60 ℃;
the temperature of the crystallization treatment was 5 ℃.
In the application example, the COD of the filtrate generated by nanofiltration treatment is less than or equal to 3.5 multiplied by 104mg/L, concentrated solution COD is more than or equal to 4.0 multiplied by 105mg/L, the purity of the recovered vitamin B6 is 99.2%, and the recovery rate of vitamin B6 is 91.7%.
Application example 8
The application example provides a method for treating vitamin B6 production wastewater by using the device system of the application example 4, and the composition of the vitamin B6 production wastewater is the same as that of the application example 1.
The step parameters of the method are the same as in application example 1.
In the application example, the COD of the filtrate generated by nanofiltration treatment is less than or equal to 3.5 multiplied by 104mg/L, concentrated solution COD is more than or equal to 4.0 multiplied by 105mg/L, the purity of the recovered vitamin B6 is 99.1%, and the recovery rate of vitamin B6 is 88.7%.
Application example 9
The application example provides a method for treating vitamin B6 production wastewater by using the device system of the application example 5, and the composition of the vitamin B6 production wastewater is the same as that of the application example 1.
The process parameters were the same as in application example 1.
In the application example, the COD of the filtrate generated by nanofiltration treatment is less than or equal to 3.5 multiplied by 104mg/L, concentrated solution COD is more than or equal to 4.0 multiplied by 105mg/L, the purity of the recovered vitamin B6 is 99.0%, and the recovery rate of vitamin B6 is 87.3%.
In summary, the membrane separation of the present invention is a technique of selective separation using different molecular sizes, and can be classified into microfiltration, ultrafiltration, nanofiltration and reverse osmosis according to the size of the membrane pore; the device system provided by the utility model uses the nanofiltration device, and effectively reduces the influence on the environment and reduces the energy consumption and the operation cost through the reasonable arrangement of the connection relationship between the devices; moreover, the device system can also realize the high-efficient recovery of vitamin B6 in the vitamin B6 waste water.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (9)
1. The device system for treating the vitamin B6 production wastewater through membrane separation is characterized by comprising a pre-filtering device, a nano-filtering device, a decoloring device, a crystallizing device and a centrifuging device which are connected in sequence;
a filtrate outlet of the centrifugal device is connected with a material inlet of the pre-filtering device;
and the nanofiltration membrane in the nanofiltration device is an acid-resistant nanofiltration membrane.
2. The apparatus system of claim 1, wherein a first material transport apparatus is disposed between the pre-filtration apparatus and the nano-filtration apparatus.
3. The apparatus system of claim 2, wherein the first material delivery apparatus comprises a high pressure pump.
4. The device system according to claim 1, wherein the pre-filtering device is preceded by a second material conveying device;
and a filtrate outlet of the centrifugal device is connected with a material inlet of the second material conveying device.
5. The device system of claim 1, wherein the pre-filter device comprises any one of a filter bag, a filter cartridge, a filter cloth, or a tube filter.
6. The device system of claim 5, wherein the pre-filter device has a filter fineness of 5-50 μm.
7. The device system of claim 1, wherein the decolorizing device comprises an adsorptive decolorizing device.
8. The apparatus system of claim 1, wherein the crystallization apparatus comprises an evaporative crystallizer or a chilled crystallizer.
9. The apparatus system of claim 8, wherein the crystallization apparatus is a cooling crystallizer.
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