CN111392913A - System and method for advanced treatment of PVC centrifugal mother liquor waste liquid - Google Patents
System and method for advanced treatment of PVC centrifugal mother liquor waste liquid Download PDFInfo
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- CN111392913A CN111392913A CN202010332945.9A CN202010332945A CN111392913A CN 111392913 A CN111392913 A CN 111392913A CN 202010332945 A CN202010332945 A CN 202010332945A CN 111392913 A CN111392913 A CN 111392913A
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- 239000007788 liquid Substances 0.000 title claims abstract description 109
- 239000012452 mother liquor Substances 0.000 title claims abstract description 28
- 239000002699 waste material Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003197 catalytic effect Effects 0.000 claims abstract description 32
- 230000003647 oxidation Effects 0.000 claims abstract description 32
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 32
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005262 decarbonization Methods 0.000 claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 76
- 150000001450 anions Chemical class 0.000 claims description 33
- 150000001768 cations Chemical class 0.000 claims description 30
- 239000011347 resin Substances 0.000 claims description 15
- 229920005989 resin Polymers 0.000 claims description 15
- -1 hydrogen ions Chemical class 0.000 claims description 12
- 229920002678 cellulose Polymers 0.000 claims description 11
- 239000001913 cellulose Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 4
- 238000005119 centrifugation Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 40
- 229910002092 carbon dioxide Inorganic materials 0.000 description 20
- 239000004800 polyvinyl chloride Substances 0.000 description 20
- 229920000915 polyvinyl chloride Polymers 0.000 description 19
- 238000006116 polymerization reaction Methods 0.000 description 7
- 239000008213 purified water Substances 0.000 description 6
- 230000003139 buffering effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/38—Polymers
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a system and a method for advanced treatment of PVC centrifugal mother liquor waste liquid, which comprises an ozone catalytic oxidation device, a primary decarbonization device, a filtering device, a full-room positive bed, a secondary decarbonization device and a full-room negative bed which are sequentially connected.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a system and a method for deep treatment of PVC centrifugal mother liquor waste liquid.
Background
In the production process of polyvinyl chloride (PVC), a large amount of high-quality desalted water is required to be used in the whole production process, no inorganic ions are added in the whole polymerization process, and the conductivity change is not large before and after biochemical and advanced treatment of the centrifugal mother liquor wastewater, and the conductivity value is low (about 200us/cm generally, about 600us/cm generally for tap water), so that the water production efficiency of ion exchange is more than 3 times that of common water, and the economic benefit is huge. The waste water produced in the production process is mainly organic matter which is difficult to degrade, has the temperature of about 70 ℃ and is very difficult to biochemically process.
The existing method for treating the PVC centrifugal mother liquor comprises the steps of directly discharging after precipitation and Fenton reach the standard, and the steps of precipitation, Fenton, ultrafiltration and reverse osmosis, so that the method I has the advantages of low water utilization rate, low economic benefit, high operation cost and unstable system operation; and for the second method, the system recovery rate is low, the effluent quality is low, and the effluent quality conductivity is less than or equal to 10 mu S/cm.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a system and a method for advanced treatment of PVC centrifugal mother liquor waste liquid, so as to achieve higher purification effect, the purified water has the electrical conductivity less than or equal to 1 muS/cm, the purified water is directly used as effluent and mainly used in a PVC polymerization device and used as polymerization pure water, the water recovery rate reaches more than 95 percent, the energy is saved, and the operation cost is reduced.
In one aspect, the invention provides a system for advanced treatment of waste liquid of PVC centrifugal mother liquor, which comprises: the ozone catalytic oxidation device is used for carrying out catalytic oxidation on organic matters in the PVC centrifugal mother liquor waste liquid to convert the organic matters into CO2 and H2O and obtain first liquid; the primary decarbonization device is connected with the ozone catalytic oxidation device and is used for removing CO2 generated in the first liquid under the action of the ozone catalytic oxidation device and obtaining a second liquid; the filtering device is connected with the primary decarbonization device and is used for further filtering the organic matters in the second liquid to obtain a third liquid; a full-cell cation bed connected to the filtering device, wherein the full-cell cation bed is filled with cation resin for deeply removing cations in the third liquid, converting other cations in the third liquid into hydrogen ions, converting carbonate and bicarbonate into CO2 and H2O under acidic conditions, and obtaining a fourth liquid; a secondary decarbonization device, connected with the full-chamber anode bed, for removing CO2 in the fourth liquid and obtaining a fifth liquid; and the full-chamber negative bed is connected with the secondary decarbonization device, and negative resin is filled in the full-chamber negative bed and is used for deeply removing the negative ions in the fifth liquid, converting other negative ions in the fifth liquid into hydroxyl ions and obtaining pure water.
Further, still include the buffering pond, be connected with first booster pump between buffering pond and the ozone catalytic oxidation device, first booster pump is used for going into ozone catalytic oxidation device with the PVC centrifugation mother liquor waste liquid pressure boost pump in the buffering pond.
Further, the filtering device comprises a cellulose filter and an activated carbon filter which are connected in series in sequence.
Further, a second booster pump is connected between the primary decarbonization device and the cellulose filter, and the second booster pump is used for pumping a second liquid into the cellulose filter under the action of pressure.
Further, still include middle water tank, middle water tank is connected in filter equipment's play water end, is connected with the third booster pump between middle water tank and the full room negative bed, the third booster pump is used for the third liquid booster pump in the middle water tank to go into full room positive bed.
Furthermore, the full-chamber anion bed is a double-chamber full-chamber anion bed, and weak base anion resin and strong base anion resin are filled in the double-chamber full-chamber anion bed.
Furthermore, the water outlet end of the full-room negative bed is connected with a pure water storage tank, and the pure water storage tank adopts a nitrogen seal design.
On the other hand, the invention also provides a method for deeply treating the waste liquid of the PVC centrifugal mother liquor, which comprises the following steps:
step S1: the method comprises the following steps that an ozone catalytic oxidation device carries out catalytic oxidation on organic matters in PVC centrifugal mother liquor waste liquid to convert the organic matters into CO2 and H2O, and first liquid is obtained;
step S2: removing CO2 generated under the action of an ozone catalytic oxidation device in the first liquid by using a primary decarbonization device to obtain a second liquid;
step S3: the filtering device further filters organic matters in the second liquid to obtain a third liquid;
step S4: deeply removing cations in the third liquid by the full-chamber cation bed to convert other cations in the third liquid into hydrogen ions, converting carbonate and bicarbonate into CO2 and H2O under acidic conditions, and obtaining a fourth liquid;
step S5: removing CO2 in the fourth liquid by using a secondary decarbonization device to obtain a fifth liquid;
step S6: and removing anions in the fifth liquid by the depth of the full-room anion bed, converting other anions in the fifth liquid into hydroxide ions, and obtaining pure water.
The invention has the beneficial effects that: by adopting the system and the method for the advanced treatment of the PVC centrifugal mother liquor waste liquid, a higher purification effect is achieved, the purified water has the electrical conductivity of less than or equal to 1 mu S/cm, the purified water is directly used as effluent and mainly used in a PVC polymerization device and used as polymerization pure water, the water recovery rate reaches more than 95 percent, the energy is saved, and the operation cost is reduced.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the attached drawings, 1-a buffer pool; 2-a first booster pump; 3-an ozone catalytic oxidation device; 4-a primary decarbonization device; 5-a second booster pump; 6-cellulose filter; 7-an activated carbon filter; 8-an intermediate water tank; 9-a third booster pump; 10-full room male bed; 11-a secondary decarbonization device; 12-full-room shade bed; 13-pure water storage tank.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely used to more clearly illustrate the technical solutions of the present embodiments, and therefore, the following embodiments are only used as examples, and the protection scope of the present embodiments is not limited thereby.
As shown in FIG. 1, the embodiment of the invention provides a system for advanced treatment of PVC centrifugal mother liquor waste liquid, which comprises a buffer water tank 1, an ozone catalytic oxidation device 3, a primary decarbonization device 4, a filtering device, an intermediate water tank 8, a full-chamber cation bed 10, a secondary decarbonization device 11 and a full-chamber anion bed 12.
The buffer pool 1 mainly plays roles of buffering and homogenizing incoming water so that the water inlet of a follow-up device is more stable. Be connected with first booster pump 2 between buffer pool 1 and the ozone catalytic oxidation device 3, first booster pump 2 is used for going into ozone catalytic oxidation device 3 with the PVC centrifugation mother liquor waste liquid pressure boost pump in buffer pool 1 to 3 pressure boost for ozone catalytic oxidation device.
The ozone catalytic oxidation device 3 is used for carrying out catalytic oxidation on organic matters in the PVC centrifugal mother liquor waste liquid to convert the organic matters into CO2 and H2O, and obtaining first liquid. The ozone catalytic oxidation device 3 mainly utilizes ozone to generate hydroxyl radicals on the surface of a catalyst, deoxidizes trace organic matters which are difficult to degrade in water, deeply removes COD (chemical oxygen demand) in wastewater and purifies water, and converts the water into CO2 and H2O so as to achieve the purpose of degrading COD.
The primary decarbonization device 4 is connected with the ozone catalytic oxidation device 3 and is used for removing CO2 generated in the first liquid under the action of the ozone catalytic oxidation device 3 to achieve the effect of removing CO2 and obtain a second liquid.
The filtering device is connected with the primary decarbonization device 4 and is used for further filtering the organic matters in the second liquid and obtaining a third liquid. The filtering device of the embodiment specifically comprises a cellulose filter 6 and an activated carbon filter 7 which are sequentially connected in series, and organic matters in the second liquid are deeply removed through the cellulose filter 6 and the activated carbon filter 7 so as to reach the index of the production water. In this embodiment, a second booster pump 5 is connected between the primary decarbonizing device 4 and the cellulose filter 6, and the second booster pump 5 is used for pumping the second liquid into the cellulose filter 6 under pressure.
The middle water tank 8 is connected with the water outlet end of the filtering device, a third booster pump 9 is connected between the middle water tank 8 and the full-chamber anion bed 12, and the third booster pump 9 is used for pumping the third liquid in the middle water tank 8 into the full-chamber cation bed 10. The intermediate water tank 8 is mainly used for buffering and storing incoming water so as to facilitate the subsequent cleaning of the full-room cation bed 10. The third booster pump 9 is used for boosting the full-chamber cation bed 10 to ensure the normal operation performance parameters of the full-chamber cation bed 10.
The inside of the full-cell cation bed 10 is filled with a cation resin for deeply removing cations in the third liquid, converting other cations in the third liquid into hydrogen ions, and carbonate and bicarbonate are converted into CO2 and H2O under acidic conditions, and obtaining a fourth liquid.
A secondary decarbonization apparatus 11 is connected to the full-cell anode bed 10 for removing CO2 from the fourth liquid and obtaining a fifth liquid. The secondary decarbonization device 11 is used for removing carbon dioxide in the water, and if carbon dioxide in the fourth liquid is not removed, the quality of the discharged water is affected.
The full-space negative bed 12 is connected to the secondary decarbonization apparatus 11, and the inside of the full-space negative bed 12 is filled with an anion resin for deeply removing anions in the fifth liquid, converting other anions in the fifth liquid into hydroxide ions, and obtaining pure water. In this embodiment, the full-chamber anion bed 12 is a dual-chamber full-chamber anion bed 12, the interior of the dual-chamber full-chamber anion bed 12 is filled with weak base anion resin and strong base anion resin, the weak base anion resin has a higher exchange capacity, and the regenerated liquid after the strong base anion resin is regenerated can be directly used for the regeneration of the weak base anion resin, so that the operation period is increased, the operation cost is reduced, the effluent index is more stable, and the conductivity of the effluent is less than or equal to 1 μ S/cm.
The water outlet end of the full-room negative bed 12 is connected with a pure water storage tank 13, and the pure water storage tank 13 adopts a nitrogen seal design, so that the quality of pure water is stably kept below the conductivity of less than or equal to 1 muS/cm.
In addition, still set up a plurality of monitor meters and automatic valve among the above-mentioned system, mainly adopt P L C to carry out all-round control to entire system, through the monitoring often to each point in the system, the operating parameter of all-round control system each position, guarantee the more stable operation of system, based on to membrane device operation maintenance nature, it carries out comprehensive control to each instrument and valve to provide P L C system, monitoring and record, if the later stage system breaks down, can carry out effectual solution and investigation, realize high-efficient automation, the life of extension membrane and the personnel's operation of being convenient for.
The embodiment of the invention also provides a method for deeply treating the waste liquid of the PVC centrifugal mother liquor, which comprises the following steps:
step S1: the ozone catalytic oxidation device 3 is used for carrying out catalytic oxidation on organic matters in the PVC centrifugal mother liquor waste liquid to convert the organic matters into CO2 and H2O and obtain a first liquid;
step S2: the primary decarbonization device 4 removes CO2 generated in the first liquid under the action of the ozone catalytic oxidation device 3, and a second liquid is obtained;
step S3: the filtering device further filters organic matters in the second liquid to obtain a third liquid;
step S4: the full-cell cation bed 10 deeply removes cations in the third liquid, converts other cations in the third liquid into hydrogen ions, and converts carbonate and bicarbonate into CO2 and H2O under acidic conditions, and obtains a fourth liquid;
step S5: the secondary decarbonization device 11 removes CO2 in the fourth liquid and obtains a fifth liquid;
step S6: the full-room anion bed 12 deeply removes anions in the fifth liquid, converts other anions in the fifth liquid into hydroxide ions, and obtains pure water.
In conclusion, the system and the method for the advanced treatment of the PVC centrifugal mother liquor waste liquid achieve a high purification effect, the purified water has the conductivity of less than or equal to 1 mu S/cm, the purified water is directly used as effluent and mainly used in a PVC polymerization device and used as polymerization pure water, the water recovery rate reaches more than 95%, energy is saved, and the operation cost is reduced.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present embodiment, and not for limiting the same; although the present embodiment has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solutions of the embodiments of the present embodiment, and all of them should be covered in the claims and the specification of the present embodiment.
Claims (8)
1. The utility model provides a system for PVC centrifugation mother liquor waste liquid advanced treatment which characterized in that includes:
the ozone catalytic oxidation device is used for carrying out catalytic oxidation on organic matters in the PVC centrifugal mother liquor waste liquid to convert the organic matters into CO2 and H2O and obtain first liquid;
the primary decarbonization device is connected with the ozone catalytic oxidation device and is used for removing CO2 generated in the first liquid under the action of the ozone catalytic oxidation device and obtaining a second liquid;
the filtering device is connected with the primary decarbonization device and is used for further filtering the organic matters in the second liquid to obtain a third liquid;
a full-cell cation bed connected to the filtering device, wherein the full-cell cation bed is filled with cation resin for deeply removing cations in the third liquid, converting other cations in the third liquid into hydrogen ions, converting carbonate and bicarbonate into CO2 and H2O under acidic conditions, and obtaining a fourth liquid;
a secondary decarbonization device, connected with the full-chamber anode bed, for removing CO2 in the fourth liquid and obtaining a fifth liquid;
and the full-chamber negative bed is connected with the secondary decarbonization device, and negative resin is filled in the full-chamber negative bed and is used for deeply removing the negative ions in the fifth liquid, converting other negative ions in the fifth liquid into hydroxyl ions and obtaining pure water.
2. The system of claim 1, further comprising a buffer water tank, wherein a first booster pump is connected between the buffer water tank and the ozone catalytic oxidation device, and the first booster pump is used for pumping the PVC centrifugal mother liquor waste liquid in the buffer water tank into the ozone catalytic oxidation device.
3. The system for the advanced treatment of the PVC centrifugal mother liquor waste liquid as claimed in claim 1, wherein the filtering device comprises a cellulose filter and an activated carbon filter which are connected in series in sequence.
4. The advanced treatment system for the PVC centrifugal mother liquor waste liquid as claimed in claim 3, wherein a second booster pump is connected between the primary decarbonization device and the cellulose filter, and the second booster pump is used for pumping a second liquid into the cellulose filter under the action of pressure.
5. The system for advanced treatment of PVC centrifugal mother liquor waste liquid as claimed in claim 1, further comprising an intermediate water tank connected to the water outlet end of the filtering device, and a third booster pump connected between the intermediate water tank and the full-chamber cation bed for boosting the third liquid in the intermediate water tank into the full-chamber cation bed.
6. The system for advanced treatment of PVC centrifugal mother liquor waste liquid as claimed in claim 1, wherein the full-chamber anion bed is a double-chamber full-chamber anion bed, and weak base anion resin and strong base anion resin are filled in the double-chamber full-chamber anion bed.
7. The system for the advanced treatment of the PVC centrifugal mother liquor waste liquid as claimed in claim 1, wherein the water outlet end of the full-chamber anion bed is connected with a pure water storage tank, and the pure water storage tank adopts a nitrogen seal design.
8. The method for deeply treating the waste liquid of the PVC centrifugal mother liquid is characterized by comprising the following steps of:
step S1: the method comprises the following steps that an ozone catalytic oxidation device carries out catalytic oxidation on organic matters in PVC centrifugal mother liquor waste liquid to convert the organic matters into CO2 and H2O, and first liquid is obtained;
step S2: removing CO2 generated under the action of an ozone catalytic oxidation device in the first liquid by using a primary decarbonization device to obtain a second liquid;
step S3: the filtering device further filters organic matters in the second liquid to obtain a third liquid;
step S4: deeply removing cations in the third liquid by the full-chamber cation bed to convert other cations in the third liquid into hydrogen ions, converting carbonate and bicarbonate into CO2 and H2O under acidic conditions, and obtaining a fourth liquid;
step S5: removing CO2 in the fourth liquid by using a secondary decarbonization device to obtain a fifth liquid;
step S6: and removing anions in the fifth liquid by the depth of the full-room anion bed, converting other anions in the fifth liquid into hydroxide ions, and obtaining pure water.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08126886A (en) * | 1994-10-28 | 1996-05-21 | Japan Organo Co Ltd | Production of ultrapure water and device therefor |
| CN101148275A (en) * | 2007-07-26 | 2008-03-26 | 北京蓝海世达科技有限公司 | PVC centrifugal mother liquor treatment reclaiming technique and device |
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Application publication date: 20200710 |