CN112777813A - Method for treating evaporated condensate water containing ammonia nitrogen - Google Patents
Method for treating evaporated condensate water containing ammonia nitrogen Download PDFInfo
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- CN112777813A CN112777813A CN202110085193.5A CN202110085193A CN112777813A CN 112777813 A CN112777813 A CN 112777813A CN 202110085193 A CN202110085193 A CN 202110085193A CN 112777813 A CN112777813 A CN 112777813A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 221
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000012528 membrane Substances 0.000 claims abstract description 136
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 131
- 238000011282 treatment Methods 0.000 claims abstract description 101
- 238000001704 evaporation Methods 0.000 claims abstract description 31
- 230000008020 evaporation Effects 0.000 claims abstract description 31
- 238000011033 desalting Methods 0.000 claims abstract description 27
- 239000002253 acid Substances 0.000 claims abstract description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 5
- 150000003863 ammonium salts Chemical class 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 4
- 229910021529 ammonia Inorganic materials 0.000 claims 2
- 229910052757 nitrogen Inorganic materials 0.000 claims 2
- 238000010612 desalination reaction Methods 0.000 abstract description 25
- 239000011347 resin Substances 0.000 abstract description 12
- 229920005989 resin Polymers 0.000 abstract description 12
- 238000005868 electrolysis reaction Methods 0.000 abstract description 6
- 239000002910 solid waste Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 27
- 238000004519 manufacturing process Methods 0.000 description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000000110 cooling liquid Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000003204 osmotic effect Effects 0.000 description 5
- 239000002904 solvent Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
-
- 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
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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)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to a desalting process, in particular to a method for treating evaporated condensate water containing ammonia nitrogen, which comprises the following steps: receiving ammonia nitrogen-containing evaporation condensate water; adding an acid solution into the ammonia nitrogen-containing evaporation condensate water and treating the ammonia nitrogen-containing evaporation condensate water through a reverse osmosis membrane to obtain first product water; adding an acid solution into the first produced water, and treating the first produced water by a reverse osmosis membrane to obtain second produced water; and adding an acid solution into the second produced water, and performing electrolytic desalting treatment on the second produced water to obtain output water with the conductivity less than 1us/cm, wherein the conductivity fluctuation tolerance range of equipment adopted during electrolytic desalting treatment is 10-43 us/cm. Compared with the prior desalination resin treatment mode adopted in the ammonia nitrogen-containing evaporation condensate water treatment, the method has the advantages that after the service life of the electrolysis desalination equipment in the method is prolonged, the electrolysis desalination equipment cannot be treated as dangerous solid waste, namely, the post-treatment cost is low, and the method is energy-saving and environment-friendly.
Description
Technical Field
The invention relates to a desalting process, in particular to a method for treating evaporated condensate water containing ammonia nitrogen.
Background
In the original chemical brine treatment, particularly in the recovery of evaporation condensate water containing ammonia nitrogen, two stages of RO (reverse osmosis membrane) + desalination resin are adopted for treatment, but the desalination resin has good adsorption effect on ammonia nitrogen and anions (nitrate radical, chloride radical and sulfate radical), but 6-8% ammonia water and 6-8% sulfuric acid solution are generally used during regeneration, the regeneration cost is high, and the treatment capacity of an evaporator is increased; the resin has a certain service life, and after 3 to 5 years, the resin performance can not meet the requirement and needs to be treated as dangerous solid waste; if the water is influenced by the conductivity fluctuation (10-40us/cm) of the two-stage RO produced water, the resin effluent fluctuation is large.
The reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics and is a core component of the reverse osmosis technology, and the artificial semipermeable membrane simulates a biological semipermeable membrane. The principle of reverse osmosis is to separate substances from water by means of a semipermeable membrane which is impermeable to other substances, under the action of a pressure higher than the osmotic pressure of the solution.
Disclosure of Invention
The invention aims to provide an ammonia nitrogen-containing evaporation condensate water treatment method which is more stable in effluent quality and environment-friendly.
The invention adopts the technical scheme that a method for treating evaporated condensate water containing ammonia nitrogen comprises the following steps:
step1, receiving the evaporated condensate water containing ammonia nitrogen;
step2, adding an acid solution into the ammonia nitrogen-containing evaporated condensate water, and treating the ammonia nitrogen-containing evaporated condensate water by a reverse osmosis membrane to obtain first product water;
step3, adding an acid solution into the first produced water and treating the first produced water by a reverse osmosis membrane to obtain second produced water;
and Step4, adding an acid solution into the second produced water, and carrying out electrolytic desalting treatment on the second produced water to obtain output water with the conductivity less than 1us/cm, wherein the tolerance of the adopted equipment for the conductivity fluctuation during the electrolytic desalting treatment is 10-43 us/cm.
Compared with the existing desalting resin treatment mode adopted in the ammonia nitrogen-containing evaporation condensate water treatment, the electrolytic desalting equipment in the method cannot be treated as dangerous solid waste after reaching the service life, namely, the post-treatment cost is lower, energy is saved and the environment is protected, and the method adopts an electric removing mode to clean and regenerate without consuming acid and alkali, thereby strengthening the energy-saving and environment-friendly characteristics of the method, and the final effluent is more stable when the tolerable electric conductivity fluctuation range of the equipment is 10-43 us/cm.
Furthermore, the conductivity of the output water is more than or equal to 0.056 us/cm.
Furthermore, when the evaporation condensed water containing ammonia nitrogen is received, the evaporation condensed water containing ammonia nitrogen is pretreated to ensure that the evaporation condensed water containing ammonia nitrogen is at a temperature of less than or equal to 30 ℃ and the evaporation condensed water containing ammonia nitrogen is kept smooth.
And (3) performing reverse osmosis membrane treatment on the evaporated condensed water containing ammonia nitrogen at the temperature of less than or equal to 30 ℃ so as to ensure the smooth performance of the reverse osmosis treatment and the safe operation of treatment equipment.
In one word, concentrated water obtained by treating evaporated condensed water containing ammonia nitrogen by a reverse osmosis membrane is treated by at least two stages of reverse osmosis membranes, and the pressure value of the reverse osmosis membrane is gradually increased along with the stage number of the concentrated water to obtain final concentrated water. The concentrate herein is subjected to at least two reverse osmosis membrane treatments to provide for sufficient concentration.
Furthermore, the produced water obtained by the reverse osmosis membrane treatment of at least two stages is refluxed to the first produced water and mixed with the first produced water, so that the produced water and the concentrated water are fully recycled and utilized to be used as approximate zero emission.
Further, the final strong water is subjected to a de-ammonification treatment, so that the final strong water is sufficiently recovered.
And in addition, concentrated water obtained by carrying out electrolysis desalting treatment on the second produced water is mixed with the first produced water and then is subjected to reverse osmosis membrane treatment again. Thus ensuring the purity of the final produced water.
Further, the concentrated water obtained when the second water production is generated is mixed with the evaporated condensed water containing ammonia nitrogen and then treated by a reverse osmosis membrane.
Furthermore, the water or the concentrated water obtained by the reverse osmosis membrane treatment is temporarily stored in a buffer container which is arranged for storing the water or the concentrated water after each treatment so as to facilitate the next stage of treatment.
The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description. Or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:
FIG. 1 is a schematic view for explaining the method for treating evaporated condensed water containing ammonia nitrogen;
the labels in the figure are: the system comprises a first reverse osmosis membrane device 1, a first reverse osmosis membrane treatment unit 110, a first water production tank 111, a first concentrated water tank 112, a second reverse osmosis membrane treatment unit 120, a second concentrated water tank 121, a third reverse osmosis membrane treatment unit 130, a third concentrated water tank 131, a second reverse osmosis membrane device 2, a second water production tank 201, a second reverse osmosis membrane device concentrated water output pipe 202, an electrolytic desalination device 3, an electrolytic desalination device water production tank 301, an electrolytic desalination device concentrated water return pipe 302, a heat exchange device 400, a refrigerating unit 410, a refrigerant storage tank 420, a cooling liquid circulation system 430, an ammonium salt removal evaporation device 5 and a raw water tank 6.
Detailed Description
The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:
the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only examples of a part of the present invention, and not all examples. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
With respect to terms and units in the present invention. The term "comprises" and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
A method for treating evaporated condensate water containing ammonia nitrogen comprises the following steps:
step1, receiving the evaporated condensate water containing ammonia nitrogen;
step2, adding an acid solution into the ammonia nitrogen-containing evaporated condensate water, and treating the ammonia nitrogen-containing evaporated condensate water by a reverse osmosis membrane to obtain first product water;
step3, adding an acid solution into the first produced water and treating the first produced water by a reverse osmosis membrane to obtain second produced water;
and Step4, adding an acid solution into the second produced water, and carrying out electrolytic desalting treatment on the second produced water to obtain output water with the conductivity less than 1us/cm, wherein the tolerance of the adopted equipment for the conductivity fluctuation during the electrolytic desalting treatment is 10-43 us/cm.
When the ammonia nitrogen-containing evaporation condensate water is received, the ammonia nitrogen-containing evaporation condensate water is pretreated to enable the temperature of the ammonia nitrogen-containing evaporation condensate water to be less than or equal to 30 ℃, and the ammonia nitrogen-containing evaporation condensate water is kept smooth.
And (3) performing reverse osmosis membrane treatment on the evaporated condensed water containing ammonia nitrogen at the temperature of less than or equal to 30 ℃ so as to ensure the smooth performance of the reverse osmosis treatment and the safe operation of treatment equipment.
When receiving the ammonia nitrogen-containing evaporation condensate water, the ammonia nitrogen-containing evaporation condensate water can be stored in the raw water tank, the temperature of the ammonia nitrogen-containing evaporation condensate water stored in the raw water tank needs to be reduced below 40 ℃, the temperature of the ammonia nitrogen-containing evaporation condensate water is ensured to be reduced below 40 ℃ actively through a cooling device, and then the ammonia nitrogen-containing evaporation condensate water is input into a heat exchanger to reduce the temperature to below 30 ℃ or below 30 ℃.
Compared with the existing desalting resin treatment mode adopted in the ammonia nitrogen-containing evaporation condensate water treatment, the electrolytic desalting equipment in the method cannot be treated as dangerous solid waste after reaching the service life, namely the post-treatment cost is low, the energy is saved and the environment is protected, and the method adopts an electric desalting mode to clean and regenerate without consuming acid and alkali, thereby further strengthening the energy-saving and environment-friendly characteristics of the method.
Preferably, the conductivity of the output water is more than or equal to 0.056 us/cm.
And (3) treating the concentrated water obtained by treating the evaporated condensed water containing ammonia nitrogen by using a reverse osmosis membrane by using at least two stages of reverse osmosis membranes, wherein the pressure value of the reverse osmosis membrane is gradually increased along with the stage number to obtain the final concentrated water. The concentrate herein is subjected to at least two reverse osmosis membrane treatments to provide for sufficient concentration. Preferably, the evaporation condensate water containing ammonia nitrogen is concentrated through a three-stage reverse osmosis membrane, the first stage can adopt a 40bar reverse osmosis membrane, the second stage can adopt an 80bar reverse osmosis membrane, and the third stage can adopt a 120bar reverse osmosis membrane.
And refluxing the produced water obtained in the reverse osmosis membrane treatment of at least two stages to the first produced water and mixing the produced water with the first produced water, so that the produced water and the concentrated water are fully recycled and utilized to realize approximate zero emission.
And (3) carrying out ammonium salt removal treatment on the final concentrated water so as to fully recover the final concentrated water.
And mixing concentrated water obtained by carrying out electrolytic desalting treatment on the second produced water with the first produced water, and then carrying out reverse osmosis membrane treatment again. Thus ensuring the purity of the final produced water.
And mixing the concentrated water obtained in the second water production with the evaporated condensed water containing ammonia nitrogen, and then treating the mixture by a reverse osmosis membrane.
The water or the concentrated water obtained by the reverse osmosis membrane treatment is temporarily stored in a buffer container, and the buffer container is arranged to store the water or the concentrated water after the treatment at each time.
Referring to fig. 1, the method can adopt a system for recovering evaporated condensate containing ammonia nitrogen, which comprises the following steps:
the first reverse osmosis membrane device 1 is used for receiving the evaporated condensed water containing ammonia nitrogen and outputting first treated water;
the second reverse osmosis membrane device 2 is communicated with the output end of the first reverse osmosis membrane device 1 and is used for receiving the first treated water and outputting second treated water;
and the electrolytic desalting device 3 is communicated with the output end of the second reverse osmosis membrane device 2 and is used for receiving second treated water, and the electrolytic desalting device 3 is used for outputting the electrolytic desalting device 3 with the water output conductivity of less than 1 us/cm.
Set up the product water of foretell reverse osmosis membrane device output through the two-stage treatment, will produce water and directly carry output product water for the electrolysis desalination device 3 that the conductivity is < 1us/cm, compare in traditional adoption desalination resin device, need not to add ammonia water and sulphuric acid solution during this system regeneration, reduced entire system's throughput, and compare in traditional adoption desalination resin device, adopt electrolysis desalination device 3 also can not regard as dangerous solid useless processing after having used up, environmental protection more.
The reverse osmosis membrane device in the present embodiment is a semipermeable membrane having selectivity for a substance to be permeated, and a membrane which is permeable only to a solvent and impermeable to a solute is called a theoretical semipermeable membrane. When the same volume of dilute solution (fresh water) and concentrated solution (salt water) is placed on both sides of the reverse osmosis membrane, the solvent in the dilute solution will naturally flow through the semipermeable membrane and spontaneously flow to one side of the concentrated solution, which is the phenomenon of osmosis.
When the osmosis reaches the equilibrium, the liquid level of the concentrated solution side is higher than the liquid level of the dilute solution by a certain height, namely, a pressure difference is formed, and the pressure difference is the osmotic pressure. The magnitude of the osmotic pressure depends on the inherent properties of the solution, i.e. on the type, concentration and temperature of the concentrated solution and not on the properties of the semipermeable membrane. If a pressure greater than the osmotic pressure is applied to the concentrated solution side, the solvent will flow in the opposite direction to the original osmotic direction and will start to flow from the concentrated solution to the dilute solution side. Reverse osmosis is a reverse migration motion of osmosis, which is the separation of solutes from a solvent in solution by selective rejection of the solution by a reverse osmosis membrane driven by pressure.
The electrolytic desalination device 3 (electrolysis) combines an ion exchange technology, an ion exchange membrane technology and an ion electromigration technology, combines electrodialysis and the ion exchange technology, moves charged ions in water by using high voltage of electrodes at two ends, and accelerates the removal of the ions by matching with an ion exchange resin and a selective resin membrane, thereby achieving the purpose of water purification.
The first reverse osmosis membrane apparatus 1 comprises at least three reverse osmosis membrane treatment units connected in series. The ammonia nitrogen is concentrated through a multi-stage and segmented reverse osmosis membrane treatment unit, the ammonia nitrogen is fully concentrated, and the set level can be set according to the index change of the ammonia nitrogen content and the yield of pure water. The output end of the most terminal reverse osmosis membrane treatment unit in the reverse osmosis membrane treatment units connected in series in three stages is connected with an ammonium salt removing evaporation device 5, and the concentrated water output port of the reverse osmosis membrane treatment unit at the head end in the reverse osmosis membrane treatment units connected in series in at least three stages is communicated with the input end of the adjacent reverse osmosis membrane treatment unit.
Specifically, in this embodiment, the concentrated water may be concentrated by using three stages of reverse osmosis membrane treatment units, the first reverse osmosis membrane apparatus 1 includes a first reverse osmosis membrane treatment unit 110, a second reverse osmosis membrane treatment unit 120, and a third reverse osmosis membrane treatment unit 130, and the second reverse osmosis membrane treatment unit 120 and the third reverse osmosis membrane treatment unit 130 are both provided with an input port for receiving an aqueous ammonia solution, so as to ensure sufficient reaction of the concentrated water from the first reverse osmosis membrane treatment unit 110.
In the present embodiment, both the second reverse osmosis membrane apparatus 2 and the first reverse osmosis membrane treatment unit 110 of the first reverse osmosis membrane apparatus 1 may employ a 40bar reverse osmosis membrane, the second reverse osmosis membrane treatment unit 120 may employ an 80bar reverse osmosis membrane, and the third reverse osmosis membrane treatment unit 130 may employ a 120bar reverse osmosis membrane.
The second reverse osmosis membrane treatment unit 120 and the third reverse osmosis membrane treatment unit 130 are both provided with reflux output pipes for refluxing the produced water to the first reverse osmosis membrane treatment unit 110, so that the produced water and the concentrated water can be fully recovered and utilized.
The reverse osmosis membrane treatment units connected in series at least form a path for fully concentrating ammonia nitrogen. The second reverse osmosis membrane device 2 described above may include only one reverse osmosis membrane treatment unit. The electrolytic desalination device 3 can also be correspondingly provided with an electrolytic desalination device water production tank 301, and finally obtained clean water or pure water enters the electrolytic desalination device water production tank 301.
The reverse osmosis membrane treatment unit or the reverse osmosis membrane device may be correspondingly provided with a water production tank or a concentrated water tank, for example, the first reverse osmosis membrane device 1 includes a first reverse osmosis membrane treatment unit 110 and a first water production tank 111, and the second reverse osmosis membrane device 2 is provided with a second water production tank 201 for collecting water produced by the second reverse osmosis membrane device 2.
The first reverse osmosis membrane treatment unit 110 of the first reverse osmosis membrane apparatus 1 is provided with a first concentrated water tank 112, a second concentrated water tank 121 provided in the second reverse osmosis membrane treatment unit 120, and a third concentrated water tank 131 provided in the third reverse osmosis membrane treatment unit 130.
The first concentrated water tank 112 is connected to the second reverse osmosis membrane treatment unit 120, the concentrated water in the first concentrated water tank 112 flows to the second reverse osmosis membrane treatment unit 120, and the second reverse osmosis membrane treatment unit 120 and the third reverse osmosis membrane treatment unit 130 are both connected to the first water production tank 111, so that the first water production tank 111 collects the produced water of the first reverse osmosis membrane treatment unit 110, the second reverse osmosis membrane treatment unit 120 and the third reverse osmosis membrane treatment unit 130.
The electrolytic desalination device 3 is provided with an electrolytic desalination device concentrated water return pipe 302 for outputting the concentrated water of the electrolytic desalination device 3 to the second reverse osmosis membrane device 2, so that the concentrated water of the electrolytic desalination device 3 is treated in a circulating manner, the purity of the produced water of the electrolytic desalination device 3 is guaranteed, and the concentrated water produced by the first reverse osmosis membrane treatment unit 110 in the first reverse osmosis membrane device 1 is treated to the second reverse osmosis membrane treatment unit 120. The concentrated water output of the second reverse osmosis membrane device 2 is connected to a concentrated water output pipe 202 of the second reverse osmosis membrane device which is fed to the input of the first reverse osmosis membrane device 1, wherein the input of the first reverse osmosis membrane device 1 can be provided with a raw water tank 6.
The input of first reverse osmosis membrane device 1 is connected with heat transfer device 400, and the heat transfer medium input of this heat transfer device 400 is connected with and is used for carrying out refrigerated refrigeration unit 410 to heat transfer medium, carries out temperature control to the input liquid that first reverse osmosis membrane device 1 will receive promptly to ensure that reverse osmosis membrane device is effective, safe operation. The heat exchanger 400 may be a water-cooled tube bank. The refrigeration unit 410 may be a conventional refrigeration device.
The cooling liquid input end of the refrigerating unit 410 is connected with a cooling liquid circulation system 430, the input end of the cooling liquid circulation system 430 is connected with the cooling liquid output end of the refrigerating unit 410 to be cooled, and the cooled cooling liquid output end of the refrigerating unit 410 is connected with the heat exchange device 400 through a cooling medium storage tank 420.
Preferably, the output end of the first reverse osmosis membrane device 1 is provided with an acid solution input port for adding an acid solution, and the output end of the second reverse osmosis membrane device 2 is provided with an acid solution input port for adding an acid solution.
The electrolytic desalting device 3 is a device capable of resisting the fluctuation range of the conductivity of 10-43us/cm, and the device capable of resisting the fluctuation range of the conductivity of 10-43us/cm is selected to ensure that the electrolytic desalting device 3 has good impact resistance.
For example, the ammonium chloride evaporation condensate water is sent to a plate type heat exchange by a pump for heat exchange, and the heat exchange is carried out on the water temperature of the wastewater, so that the water temperature is stably controlled at 30 +/-2 ℃;
and (3) adding hydrochloric acid into the cooled water to adjust the pH value to 6.5-7.2, sending the water into a first reverse osmosis membrane treatment unit, sending the concentrated water of the first reverse osmosis membrane treatment unit into a second reverse osmosis membrane treatment unit, sending the concentrated water of the second reverse osmosis membrane treatment unit into a third reverse osmosis membrane treatment unit, and finally discharging the concentrated water of the third reverse osmosis membrane treatment unit out of the system. The water produced by the first reverse osmosis membrane treatment unit, the second reverse osmosis membrane treatment unit and the third reverse osmosis membrane treatment unit is finally gathered in a first water production tank;
3) the water produced by the first water production tank is fed into a second reverse osmosis membrane device by adding hydrochloric acid to adjust the pH value to 6.5-7.2, so that the water produced by the second reverse osmosis membrane device is obtained and stored in a second water production tank, and the concentrated water of the second reverse osmosis membrane device is directly fed back to the raw water tank;
4) the water produced by the second reverse osmosis membrane device is fed into the electrolytic desalination device by adding hydrochloric acid to adjust the pH value to 6.5-7.2, finally the water produced by the electrolytic desalination device meeting the requirements is obtained and stored in the water production tank of the electrolytic desalination device, and the concentrated water of the electrolytic desalination device is directly fed into the first water production tank.
The following table 1 shows the water quality estimation and material balance table of the embodiment of the method using the ammonia nitrogen-containing evaporation condensate water recovery system.
TABLE 1
The table shows that the method keeps the final water yield above 81 percent and the ammonia nitrogen content is 0.32mg/l, the method has higher water yield and stronger desalting efficiency, and compared with the traditional desalting resin, the method adopts the electrolytic desalting device for treatment, the electrolytic desalting device cannot be treated as dangerous solid waste after reaching the service life, namely, the post-treatment cost is lower, the method is energy-saving and environment-friendly, and the method adopts an electric relief mode to clean and regenerate without consuming acid and alkali, thereby strengthening the energy-saving and environment-friendly characteristics of the method, and when the adopted device can resist the electric conductivity fluctuation range of 10-43us/cm, the final effluent is more stable.
The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.
Claims (9)
1. The method for treating the evaporated condensate water containing ammonia nitrogen is characterized by comprising the following steps of:
step1, receiving the evaporated condensate water containing ammonia nitrogen;
step2, adding an acid solution into the ammonia nitrogen-containing evaporated condensate water, and treating the ammonia nitrogen-containing evaporated condensate water by a reverse osmosis membrane to obtain first product water;
step3, adding an acid solution into the first produced water and treating the first produced water by a reverse osmosis membrane to obtain second produced water;
and Step4, adding an acid solution into the second produced water, and carrying out electrolytic desalting treatment on the second produced water to obtain output water with the conductivity less than 1us/cm, wherein the tolerance of the adopted equipment for the conductivity fluctuation during the electrolytic desalting treatment is 10-43 us/cm.
2. The method for treating evaporated condensate containing ammonia nitrogen as claimed in claim 1, wherein the electrical conductivity of the output water is not less than 0.056 us/cm.
3. The method for treating ammonia nitrogen-containing evaporation condensate water according to claim 1, wherein when the ammonia nitrogen-containing evaporation condensate water is received, the ammonia nitrogen-containing evaporation condensate water is pretreated to enable the temperature of the ammonia nitrogen-containing evaporation condensate water to be less than or equal to 30 ℃ and keep the ammonia nitrogen-containing evaporation condensate water smooth.
4. The method according to claim 1, wherein the concentrated water obtained by subjecting the evaporated condensed water containing ammonia and nitrogen to reverse osmosis membrane treatment is subjected to reverse osmosis membrane treatment in at least two stages and the pressure value of the reverse osmosis membrane is gradually increased according to the stage number to obtain the final concentrated water.
5. The method according to claim 4, wherein the produced water obtained from the reverse osmosis membrane treatment in at least two stages is returned to the first produced water and mixed with the first produced water.
6. The method for treating evaporated condensate water containing ammonia nitrogen as claimed in claim 4, wherein the final concentrated water is subjected to ammonium salt removal treatment.
7. The method for treating evaporated condensate containing ammonia nitrogen as claimed in claim 1, wherein the concentrated water obtained by subjecting the second produced water to the electrolytic desalting treatment is mixed with the first produced water and then subjected to the reverse osmosis membrane treatment again.
8. The method according to claim 1, wherein the concentrated water obtained when the second product water is produced is mixed with the evaporated condensed water containing ammonia and nitrogen and then subjected to reverse osmosis membrane treatment.
9. The method for treating evaporated condensate containing ammonia nitrogen as claimed in claim 1, wherein the produced water or concentrated water obtained by each reverse osmosis membrane treatment is temporarily stored in a buffer container.
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