CN110550801A - Ultrafiltration membrane spinning wastewater treatment system and treatment method - Google Patents
Ultrafiltration membrane spinning wastewater treatment system and treatment method Download PDFInfo
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- CN110550801A CN110550801A CN201910801783.6A CN201910801783A CN110550801A CN 110550801 A CN110550801 A CN 110550801A CN 201910801783 A CN201910801783 A CN 201910801783A CN 110550801 A CN110550801 A CN 110550801A
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- 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)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides an ultrafiltration membrane spinning wastewater treatment system and a treatment method, wherein the treatment system comprises an adjusting tank, a first evaporator, a second evaporator, a recovery tank and a discharge tank, a water distributor is also arranged in the adjusting tank, a water inlet of the water distributor is communicated with the outside, the adjusting tank is communicated with the first evaporator, a liquid outlet at the top end of the first evaporator is communicated with the second evaporator, a liquid outlet at the top end of the second evaporator is communicated with the discharge tank, and a liquid outlet at the bottom end of the second evaporator is communicated with the recovery tank.
Description
Technical Field
The invention relates to the technical field of ultrafiltration membrane post-treatment, in particular to an ultrafiltration membrane spinning wastewater treatment system and a treatment method.
Background
The hollow fiber ultrafiltration membrane is prepared by a wet spinning process mostly by adopting an organic solvent, such as N, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone, and the like, and by adopting reverse osmosis water as a coagulant through a spinning process.
In the spinning process, reverse osmosis water and an ultrafiltration membrane yarn are continuously mixed and dissolved with an organic solvent in the contact process to cause the mixing and dissolving of the organic solvent in the reverse osmosis water, when the organic solvent is accumulated to a certain amount, the coagulation effect of the organic solvent can influence the quality of the ultrafiltration membrane yarn, so that spinning wastewater is formed and needs to be replaced, however, the organic matter concentration of the wastewater is not high, and the direct discharge can cause serious environmental pollution, if the spinning wastewater is discharged after being treated, the production cost can be increased, and therefore, how to effectively treat the ultrafiltration membrane spinning wastewater and become a big problem in the field.
Disclosure of Invention
In view of the above, the invention provides an ultrafiltration membrane spinning wastewater treatment system and a treatment method, which can reduce the treatment cost of enterprises and reduce wastewater discharge and are more environment-friendly.
The technical scheme of the invention is realized as follows: the invention provides an ultrafiltration membrane spinning wastewater treatment system which comprises an adjusting tank, a first evaporator, a second evaporator, a recovery tank and a discharge tank, wherein a water distributor is further arranged inside the adjusting tank, a water inlet of the water distributor is communicated with the outside, the adjusting tank is communicated with the first evaporator, a liquid outlet at the top end of the first evaporator is communicated with the second evaporator, a liquid outlet at the top end of the second evaporator is communicated with the discharge tank, and a liquid outlet at the bottom end of the second evaporator is communicated with the recovery tank.
On the basis of the above technical scheme, preferably, the system further comprises a third evaporator, wherein a top end liquid outlet of the second evaporator is communicated with the third evaporator, and a top end liquid outlet of the third evaporator is communicated with the discharge pool.
On the basis of the above technical solution, preferably, the first evaporator is a thin film evaporator.
On the basis of the above technical solution, preferably, the second evaporator is a distillation column, and the third evaporator is a rectification column.
On the basis of the technical scheme, the liquid-cooled evaporator preferably further comprises a condenser, and a liquid outlet at the top end of the first evaporator is communicated with the second evaporator through the condenser.
Still further preferably, the evaporator further comprises a buffer tank and a first delivery pump, wherein a liquid outlet of the first condenser is communicated with the second evaporator through the buffer tank, and the first delivery pump is arranged on a pipeline between the buffer tank and the second evaporator.
On the basis of the technical scheme, preferably, the device further comprises a pH meter and a waste slag pool, wherein the pH meter is installed on the adjusting tank, a detection electrode of the pH meter is located inside the adjusting tank, and a bottom end outlet of the first evaporator is communicated with the waste slag pool.
On the basis of the above technical solution, preferably, a second delivery pump is arranged on a connecting pipeline between the adjusting tank and the first evaporator.
The invention also provides a method for treating the ultrafiltration membrane spinning wastewater, which comprises the following steps:
Step one, adding ultrafiltration membrane spinning wastewater into an adjusting tank through a water inlet of a water distributor, and simultaneously adding a pH adjusting agent into the water inlet of the water distributor to adjust the pH to 6-7;
Step two, after the adjustment is finished, a second conveying pump is started, the wastewater in the adjusting tank is conveyed to a first evaporator, the first evaporator evaporates water and an organic solvent in the ultrafiltration membrane spinning wastewater and discharges the water and the organic solvent to a second evaporator, and salt which cannot be evaporated is discharged to a waste residue pool;
Step three, the second evaporator carries out primary separation on the mixed solution of water and the organic solvent for the first time, the solvent with high boiling point enters a recovery pool, and the mixed solution of water and the organic solvent with low boiling point enters the third evaporator again for separation;
And step four, separating the mixed liquid of the water with the low boiling point and the organic solvent again by the third evaporator, and feeding the water with the low boiling point into a discharge pool.
on the basis of the above technical scheme, preferably, in the second step, the working pressure of the first evaporator is 0.4-0.6Mpa, and the working temperature is 80-90 ℃.
Compared with the prior art, the ultrafiltration membrane spinning wastewater treatment system and the ultrafiltration membrane spinning wastewater treatment method have the following beneficial effects:
(1) the ultrafiltration membrane spinning wastewater treatment device can treat ultrafiltration membrane spinning wastewater, separate a recoverable part from a non-recoverable part, and separate an organic solvent of the recoverable part from water, wherein the organic solvent can be recycled, and the water can be discharged for treatment and can also be recycled, so that the production cost of enterprises is reduced, and the pollution is reduced;
(2) the invention also provides a treatment step of the wastewater treatment device, the step is simple in whole and easy to realize, the aim of quickly recovering the organic solvent can be fulfilled, water used as a coagulant can be selectively recovered or further rectified, and the operation flexibility is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view showing the connection relationship of the ultrafiltration membrane spinning wastewater treatment system of the present invention.
In the figure: 1-an adjusting tank, 2-a first evaporator, 3-a second evaporator, 4-a recovery tank, 5-a discharge tank, 6-a third evaporator, 7-a condenser, 8-a buffer tank, 9-a first delivery pump, 10-a waste residue tank, 11-a water distributor, 12-a pH meter and 13-a second delivery pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
as shown in fig. 1, in a specific embodiment, the system for treating wastewater from ultrafiltration membrane spinning according to the present invention includes a regulating tank 1, a first evaporator 2, a second evaporator 3, a recovery tank 4 and a discharge tank 5, wherein a water distributor 11 is further disposed inside the regulating tank 1, a water inlet of the water distributor 11 is communicated with the outside, the regulating tank 1 is communicated with the first evaporator 2, a top liquid outlet of the first evaporator 2 is communicated with the second evaporator 3, a top liquid outlet of the second evaporator 3 is communicated with the discharge tank 5, and a bottom liquid outlet is communicated with the recovery tank 4.
In the above embodiment, since the ultrafiltration membrane filaments are mostly prepared in the acid washing environment, part of the acid washing medium is brought in when passing through the coagulant, resulting in that the reverse osmosis water is acidic, and in order to ensure normal wastewater recovery, the pH adjustment is required, therefore, the pH adjustment is firstly performed in the adjustment tank 1, as an optimal scheme, the wastewater and the alkali liquor both enter through the water inlet of the water distributor 11, thereby achieving the purpose of uniform distribution and mixing, the step of stirring can be omitted, the energy consumption is reduced, the treated wastewater enters the first evaporator 2 to be evaporated, thereby separating the salt in the wastewater from the mixed solvent, the solvent enters the second evaporator 3 to be distilled, the boiling points of different solvents do not pass through, thereby achieving the purpose of primary separation, since the boiling points of the organic solvent used in the production of the ultrafiltration membrane filaments are basically higher than the boiling point of water, the water content of the low-boiling solvent obtained at the upper end is higher, the solvent at the lower end is basically an organic solvent, so that the water content is lower, and the solvent can be recycled.
In the specific embodiment, the device further comprises a third evaporator 6, wherein a top end liquid outlet of the second evaporator 3 is communicated with the third evaporator 6, and a top end liquid outlet of the third evaporator 6 is communicated with the discharge pool 5.
among the above embodiment, because the low boiling thing that 3 top liquid outlets of second evaporimeter obtained contains organic solvent and dose is higher relatively, and direct emission pollutes great, and the recycle degree of difficulty is great, consequently sets up third evaporimeter 6 and carries out rectification once more to this low boiling thing, and the low boiling thing purity that obtains of the top liquid outlet of third evaporimeter 6 is higher, is water basically, and is more environmental protection feasible.
In a particular embodiment, the first evaporator 2 is a thin film evaporator.
In a specific embodiment, the second evaporator 3 is a distillation column and the third evaporator 6 is a rectification column.
In the above embodiment, the first evaporator 2 is a thin film evaporator, the evaporation efficiency is higher, and wastewater can be rapidly treated, the second evaporator 3 is a distillation tower and can perform preliminary separation of high-boiling solvent and low-boiling solvent, so as to achieve the effect of rapidly recovering organic solvent, and the third evaporator 6 is a distillation tower and can further separate low-boiling mixed solvent with lower purity, so as to reduce the discharge pressure or improve the recovery rate of solvent.
In the specific embodiment, the device further comprises a condenser 7, and the top liquid outlet of the first evaporator 2 is communicated with the second evaporator 3 through the condenser 7.
In the above embodiment, since the evaporation efficiency of the first evaporator 2 is high, the condenser 7 is provided to quickly condense the evaporated mixed solvent.
In the specific embodiment, the system further comprises a buffer tank 8 and a first delivery pump 9, the liquid outlet of the condenser 7 is communicated with the second evaporator 3 through the buffer tank 8, and the first delivery pump 9 is arranged on a pipeline between the buffer tank 8 and the second evaporator 3.
In the above embodiment, the buffer tank 8 is used to buffer the mixed solvent evaporated by the first evaporator 2, and the first transfer pump 9 is used to pump the mixed solvent in the buffer tank 8 into the second evaporator 3.
In a specific embodiment, the device further comprises a pH meter 12 and a waste slag pool 10, wherein the pH meter 12 is installed on the adjusting tank 1, a detection electrode of the pH meter 12 is located inside the adjusting tank 1, and a bottom end outlet of the first evaporator 2 is communicated with the waste slag pool 10.
In the above embodiment, the pH meter 12 is used to detect whether the pH value of the wastewater in the adjustment tank 1 meets the treatment requirement, and the solid waste salt remaining after the evaporation in the first evaporator 2 and the solvent that is difficult to evaporate are discharged into the waste residue tank 10 and can be treated as solid waste.
in a specific embodiment, a second delivery pump 13 is arranged on a connecting pipeline of the adjusting tank 1 and the first evaporator 2.
In the above embodiment, the second transfer pump 13 is used for pumping the sewage to be treated in the conditioning tank 1.
In a specific embodiment, a method for wastewater treatment using the above treatment system comprises the steps of:
Step one, adding ultrafiltration membrane spinning wastewater into an adjusting tank through a water inlet of a water distributor 11, and simultaneously adding a pH regulator into the water inlet of the water distributor 11 to adjust the pH to 6-7;
Step two, after the adjustment is finished, a second conveying pump 13 is started, the wastewater in the adjusting tank 1 is conveyed to a first evaporator 2, the first evaporator 2 evaporates water and an organic solvent in the ultrafiltration membrane spinning wastewater and discharges the water and the organic solvent to a second evaporator 3, and salt which cannot be evaporated is discharged to a waste residue pool;
Step three, the second evaporator 3 carries out primary separation on the mixed solution of water and organic solvent for the first time, the solvent with high boiling point enters a recovery pool 4, and the mixed solution of water with low boiling point and organic solvent enters a third evaporator 6 for separation;
And step four, separating the mixed liquid of the water with the low boiling point and the organic solvent again by the third evaporator 6, and feeding the water with the low boiling point into a discharge tank.
in the second step, the working pressure of the first evaporator 2 is 0.4-0.6Mpa, and the working temperature is 80-90 ℃.
The treatment method is simple and effective, can quickly treat the spinning wastewater of the ultrafiltration membrane, and can recover the recyclable part, thereby reducing the pollution degree of the dischargeable part.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an milipore filter spinning effluent disposal system, its characterized in that, includes surge tank (1), first evaporimeter (2), second evaporimeter (3), recovery pond (4) and discharge pond (5), surge tank (1) inside still is equipped with water-locator (11), and the water inlet and the external world of water-locator (11) communicate each other, and surge tank (1) and first evaporimeter (2) communicate each other, and the top liquid outlet of first evaporimeter (2) communicates each other with second evaporimeter (3), and the top liquid outlet of second evaporimeter (3) communicates each other with discharge pond (5), and the bottom liquid outlet communicates each other with recovery pond (4).
2. the system for treating wastewater generated by spinning with ultrafiltration membranes as claimed in claim 1, further comprising a third evaporator (6), wherein the top outlet of the second evaporator (3) is communicated with the third evaporator (6), and the top outlet of the third evaporator (6) is communicated with the discharge tank (5).
3. The ultrafiltration membrane spinning wastewater treatment system of claim 2, wherein the first evaporator (2) is a thin film evaporator.
4. The ultrafiltration membrane spinning wastewater treatment system according to claim 2, wherein the second evaporator (3) is a distillation column and the third evaporator (6) is a rectification column.
5. The system for treating wastewater generated by spinning ultrafiltration membranes according to claim 1, further comprising a condenser (7), wherein the top liquid outlet of the first evaporator (2) is communicated with the second evaporator (3) through the condenser (7).
6. The system for treating wastewater generated by spinning with ultrafiltration membranes as claimed in claim 5, further comprising a buffer tank (8) and a first delivery pump (9), wherein the liquid outlet of the condenser (7) is communicated with the second evaporator (3) through the buffer tank (8), and the first delivery pump (9) is arranged on a pipeline between the buffer tank (8) and the second evaporator (3).
7. The ultrafiltration membrane spinning wastewater treatment system of claim 1, further comprising a pH meter (12) and a waste residue pool (10), wherein the pH meter (12) is installed on the adjusting tank (1), a detection electrode of the pH meter (12) is positioned inside the adjusting tank (1), and a bottom end outlet of the first evaporator (2) is communicated with the waste residue pool (10).
8. The ultrafiltration membrane spinning wastewater treatment system as claimed in claim 1, characterized in that a second delivery pump (13) is arranged on the connecting pipeline of the regulating tank (1) and the first evaporator (2).
9. The ultrafiltration membrane spinning wastewater treatment method is characterized by comprising the following steps:
Step one, adding ultrafiltration membrane spinning wastewater into an adjusting tank through a water inlet of a water distributor (11), and simultaneously adding a pH adjusting agent into the water inlet of the water distributor (11) to adjust the pH to 6-7;
Step two, after the adjustment is finished, a second conveying pump (13) is started, the wastewater in the adjusting tank (1) is conveyed to a first evaporator (2), the first evaporator (2) evaporates water and an organic solvent in the ultrafiltration membrane spinning wastewater and discharges the water and the organic solvent to a second evaporator (3), and salt which cannot be evaporated is discharged to a waste residue pool;
step three, the second evaporator (3) carries out primary separation on the mixed solution of water and the organic solvent for the first time, the solvent with high boiling point enters a recovery pool (4), and the mixed solution of water and the organic solvent with low boiling point enters a third evaporator (6) for separation;
And step four, separating the mixed liquid of the water with the low boiling point and the organic solvent again by the third evaporator (6), and feeding the water with the low boiling point into a discharge pool.
10. The ultrafiltration membrane spinning wastewater treatment method of claim 9, wherein in the second step, the working pressure of the first evaporator (2) is 0.4-0.6Mpa, and the working temperature is 80-90 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910801783.6A CN110550801A (en) | 2019-08-28 | 2019-08-28 | Ultrafiltration membrane spinning wastewater treatment system and treatment method |
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| CN201910801783.6A CN110550801A (en) | 2019-08-28 | 2019-08-28 | Ultrafiltration membrane spinning wastewater treatment system and treatment method |
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Cited By (1)
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| WO2022144470A1 (en) * | 2020-12-28 | 2022-07-07 | Ingeniería Y Desarrollo De Sistemas De Tratamiento De Aguas Y Medioambiente S. A. C. | Method for eliminating the use of chemical products in pre-treatment in seawater desalination plants based on reverse osmosis |
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Application publication date: 20191210 |