CN214299718U - Desulfurization wastewater treatment system - Google Patents
Desulfurization wastewater treatment system Download PDFInfo
- Publication number
- CN214299718U CN214299718U CN202023113015.9U CN202023113015U CN214299718U CN 214299718 U CN214299718 U CN 214299718U CN 202023113015 U CN202023113015 U CN 202023113015U CN 214299718 U CN214299718 U CN 214299718U
- Authority
- CN
- China
- Prior art keywords
- unit
- reverse osmosis
- reaction
- treatment system
- desulfurization wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a desulfurization effluent disposal system, including bipolar membrane electrodialysis unit and the preliminary sedimentation pond that communicates in proper order, reaction-separating mechanism, neutralization pond, ultrafiltration unit, receive filtration unit, reverse osmosis reaction mechanism, ion exchange unit and evaporation crystallization unit, bipolar membrane electrodialysis unit's water inlet with reverse osmosis reaction mechanism's dense water export passes through the pipeline intercommunication, its acidizing fluid export with the neutralization pond passes through the pipe connection, its alkali lye export with reaction-separating mechanism's the medicine mouth that adds passes through the pipe connection. The utility model provides a desulfurization effluent disposal system improves in the design of reverse osmosis membrane subassembly and reverse osmosis system in current evaporation crystallization technology, breaks through reverse osmosis system's concentrated limit under the condition that need not to show improvement operating pressure and running cost, reduces substantially the discharge of the final strong brine of system, both improves water resource recovery and utilization efficiency, also reduces substantially the comprehensive treatment cost who realizes zero liquid discharge.
Description
Technical Field
The utility model relates to a waste water treatment field. More specifically, the utility model relates to a desulfurization effluent disposal system.
Background
With the continuous improvement of environmental protection requirements, the contradictions of insufficient water resources, limited environmental capacity and the like are increasingly prominent. A large amount of wastewater is generated in the production process of a thermal power plant, wherein the desulfurization wastewater generated in the wet desulfurization process is always difficult to treat industrial wastewater of the thermal power plant due to the characteristics of high salt content, high hardness, high corrosivity and the like.
At present, the 'zero discharge' process of the desulfurization wastewater of a thermal power plant mainly comprises a flue gas evaporation process and an evaporation crystallization process. The flue gas evaporation process is characterized in that desulfurization waste water is sprayed into a flue or a bypass flue through an atomizing nozzle, water is atomized and evaporated into water vapor by using the waste heat of flue gas, and soluble salt is collected along with smoke dust after being crystallized and separated out, so that a large amount of fly ash with extremely low utilization value or difficult treatment is generated. The evaporative crystallization process adopts the traditional water treatment process, fresh water is recycled through the steps of softening, deep pretreatment, decrement concentration, evaporative crystallization and the like, and dissolved salts in the wastewater are bagged, transported and comprehensively utilized or disposed after being crystallized and dried, so that secondary pollution is avoided.
The potential influences of comprehensive energy efficiency, coal ash utilization and the like need to be considered for flue gas evaporation; the evaporative crystallization process can realize the resource utilization of solid waste through salt separation, and is expected to become a desulfurization waste water zero-discharge technical scheme with strong market competitiveness. On the one hand, a large amount of medicament is consumed in the softening process of the desulfurization wastewater, and the pretreatment cost is increased. On the other hand, the existing conventional reverse osmosis membrane module and the reverse osmosis system formed of the same generally can concentrate brine only to 50000 to 70000mg/L due to the existence of osmotic pressure and the limitation of practical operation pressure, severely limits further improvement of water recovery rate of the reverse osmosis system, and thus generates a large amount of strong brine. The process treatment such as subsequent evaporation, crystallization and the like forms huge pressure on investment and energy consumption, and although the ultrahigh pressure reverse osmosis membrane component and a reverse osmosis system formed by the conventional reverse osmosis membrane component can break through the concentration limit, the investment and operation cost are high and certain potential safety hazards exist. The evaporative crystallization process has a larger technical progress space in the aspects of reducing softening medicine consumption, reducing evaporation water quantity, reducing investment and operation cost and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a desulfurization wastewater treatment system, which improves the design of a reverse osmosis membrane component and a reverse osmosis system in the existing evaporative crystallization process, and breaks through the concentration limit of the reverse osmosis system under the condition of not obviously improving the operating pressure and the operating cost; introducing bipolar membrane electrodialysis, shunting part of the concentrated water of the reverse osmosis system, and generating acid and alkali solution for reusing in the reaction-separation mechanism. Compared with the traditional desulfurization wastewater treatment system, the system can greatly reduce the flow of strong brine entering the evaporation crystallization unit, thereby improving the water resource recycling efficiency and greatly reducing the comprehensive treatment cost for realizing zero liquid discharge.
The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a desulfurization effluent disposal system, includes bipolar membrane electrodialysis unit and the preliminary sedimentation tank, reaction-separating mechanism, neutralization pond, ultrafiltration unit, the unit of receiving nanofiltration, reverse osmosis reaction mechanism, ion exchange unit and the evaporation crystallization unit that communicate in proper order, bipolar membrane electrodialysis unit's water inlet with reverse osmosis reaction mechanism's dense water export passes through the pipeline intercommunication, its acidizing fluid export with the neutralization tank passes through the pipe connection, its alkali lye export with reaction-separating mechanism's dosing mouth passes through the pipe connection.
Preferably, in the desulfurization wastewater treatment system, the reaction-separation mechanism includes at least one set of reaction-separation unit, and when the reaction-separation mechanism includes more than one set of reaction-separation unit, the reaction-separation units are connected in series.
Preferably, in the desulfurization wastewater treatment system, the reaction-separation unit comprises a reaction unit and a sedimentation tank, and a liquid outlet of the reaction unit is communicated with a water inlet of the sedimentation tank through a pipeline.
Preferably, in the desulfurization wastewater treatment system, the reaction-separation mechanism includes a first reaction unit, a first sedimentation tank, a second reaction unit and a second sedimentation tank which are sequentially communicated, wherein the first reaction unit and the first sedimentation tank, and the second reaction unit and the second sedimentation tank respectively form a group of the reaction-separation units, and an alkali liquor outlet of the bipolar membrane electrodialysis unit is connected with a dosing port of the first reaction unit through a pipeline.
Preferably, the desulfurization wastewater treatment system further comprises a filtering unit, wherein the filtering unit is arranged between the neutralization tank and the ultrafiltration unit, and a liquid inlet and a liquid outlet of the filtering unit are respectively communicated with a water outlet of the neutralization tank and a liquid inlet of the ultrafiltration unit through pipelines.
Preferably, in the desulfurization wastewater treatment system, the filter unit is a multi-media filter.
Preferably, in the desulfurization wastewater treatment system, the reverse osmosis reaction mechanism comprises a plurality of reverse osmosis units connected in series.
Preferably, in the desulfurization wastewater treatment system, the fresh water outlet of any reverse osmosis unit is communicated with the water inlet of the previous reverse osmosis unit through a pipeline.
Preferably, in the desulfurization wastewater treatment system, the reverse osmosis reaction mechanism comprises a first reverse osmosis unit, a second reverse osmosis unit and a third reverse osmosis unit which are connected in sequence, a fresh water outlet of the second reverse osmosis unit is communicated with a water inlet of the first reverse osmosis unit through a pipeline, and a fresh water outlet of the third reverse osmosis unit is communicated with a water inlet of the second reverse osmosis unit through a pipeline.
Preferably, in the desulfurization wastewater treatment system, the apparent rejection rate of the first reverse osmosis unit is more than 95%, the apparent rejection rate of the second reverse osmosis unit is 70-90%, and the apparent rejection rate of the third reverse osmosis unit is 50-70%.
The utility model relates to a desulfurization wastewater treatment system, the concentration limit of the existing reverse osmosis system can be broken through without obviously improving the operating pressure and the operating cost of the reverse osmosis system, the water quantity entering the evaporative crystallization system is greatly reduced, the water resource recycling efficiency can be improved, and the comprehensive treatment cost for realizing zero liquid discharge can be greatly reduced; acid and alkali generated by bipolar membrane electrodialysis are reused in the softening and neutralizing processes of pretreatment, so that the medicament cost in the treatment process is reduced, and the resource utilization of the crystalline salt is realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural view of a desulfurization wastewater treatment system according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
FIG. 1 is a view of an embodiment of the present invention providing a desulfurization wastewater treatment system, which includes a bipolar membrane electrodialysis unit 15, and a pre-settling tank 1, a first reaction unit 2, a first sedimentation tank 3, a second reaction unit 4, a second sedimentation tank 5, a neutralization tank 6, a filtration unit 7, an ultrafiltration unit 8, a nanofiltration unit 9, a first reverse osmosis unit 10, a second reverse osmosis unit 11, a third reverse osmosis unit 12, an ion exchange unit 13, and an evaporative crystallization unit 14, which are sequentially connected to each other, wherein a fresh water outlet of the second reverse osmosis unit 11 is communicated with a water inlet of the first reverse osmosis unit 10 through a pipeline, a fresh water outlet of the third reverse osmosis unit 12 is communicated with a water inlet of the second reverse osmosis unit 11 through a pipeline, a water inlet of the bipolar membrane electrodialysis unit 15 is communicated with a concentrated water outlet of the third reverse osmosis unit 12 through a pipeline, and an acid liquor outlet thereof is connected with the neutralization tank 6 through a pipeline, the alkali liquor outlet of the reactor is connected with the medicine adding port of the first reaction unit 2 through a pipeline.
In this embodiment, when the desulfurization wastewater treatment system is used, desulfurization wastewater is introduced into the pre-settling tank 1 at S1, and lime and polyacrylamide PAM are added into the desulfurization wastewater to accelerate the settling of suspended solids, thereby reducing the turbidity of effluent; then carrying out solid-liquid separation to obtain a first clarified liquid, and introducing the treated wastewater into the next stage;
s2, discharging water from the preliminary sedimentation tank 1, namely the first clarified liquid enters the first clarifying liquidThe reaction unit 2 is used for adding alkali liquor into the first clarified liquid until the pH value is more than 11, so that hard magnesium and hard silicon can be effectively removed; then, a coagulant aid and organic sulfur are sequentially added through a dosing system of the first reaction unit 2 to promote precipitation coagulation; then the solid-liquid separation is realized through a first sedimentation tank 3, which can ensure suspended matters, colloid, heavy metal ions and Mg (OH) in the solution2The precipitate is coagulated and settled, the precipitate is left in the first settling pond 3 to obtain a second clarified liquid, and the treated wastewater enters the next stage;
s3, the second clarified liquid flows to a second reactor, and soda Na is added into the second reactor through a medicine adding system of a second reaction unit 42CO3And coagulant aid, Ca is removed through a secondary sedimentation tank2+Further reducing the hardness of the wastewater; then carrying out solid-liquid separation to obtain a third clarified liquid, and introducing the treated wastewater into the next stage;
through two-stage chemical softening and coagulation-sedimentation, suspended matters, colloids, heavy metals, calcium, magnesium, barium, strontium and other metal ions in the desulfurization wastewater can be effectively removed, the hardness of calcium in the effluent of the secondary sedimentation tank is less than or equal to 5mg/L, and the hardness of magnesium in the effluent of the secondary sedimentation tank is less than or equal to 5mg/L, so that a good softening effect is achieved.
S4, feeding the supernatant of the second sedimentation tank 5, namely a third clarified liquid into a neutralization tank 6, and adding acid liquor into the third clarified liquid until the third clarified liquid is weakly acidic so as to control organic matters and Ca2+Depositing on the surface of the ultrafiltration and nanofiltration membrane to slow down membrane pollution; then sequentially carrying out ultrafiltration treatment and nanofiltration treatment, and carrying out nanofiltration treatment to obtain fresh water for later use. Wherein the ultrafiltration unit 8 removes small-particle suspended matters, colloids and macromolecular organic matters in the wastewater; the nanofiltration unit 9 removes divalent ions and micromolecular organic matters in the ultrafiltration produced water, and carries out salt separation and purification treatment to improve the purity of the sodium chloride in the produced water; concentrated water of the nanofiltration unit 9 is discharged to the pre-sedimentation tank 1, and fresh water enters the reverse osmosis unit; in addition, in S4, an acid solution is added to the third clarified liquid until the third clarified liquid becomes weakly acidic, and then, after filtering to remove suspended substances, ultrafiltration treatment is performed. And discharging the concentrated water obtained by the nanofiltration treatment in the S4 into the desulfurization wastewater in the S1, and performing the treatment on the concentrated water obtained by the nanofiltration treatment in the S4 again.
And S5, concentrating the fresh water obtained by the nanofiltration treatment in the S4, carrying out ion exchange treatment on the concentrated water, removing high-valence ions, evaporating and crystallizing to obtain industrial sodium chloride with the purity of more than 99%, and recycling the industrial sodium chloride as fresh water after steam condensation.
Specifically, the concentration of the fresh water obtained by nanofiltration treatment in the step S4 by reverse osmosis concentration in the step S5 specifically includes:
s51, carrying out first reverse osmosis concentration treatment on the fresh water obtained by the nanofiltration treatment in the S4 to obtain a first feed liquid and first produced water;
s52, performing reverse osmosis concentration treatment on the first feed liquid obtained in the S51 for the second time to obtain a second feed liquid and second produced water, and mixing the second produced water into fresh water obtained through nanofiltration treatment in the S4;
and S53, performing reverse osmosis concentration treatment on the second feed liquid obtained in the S51 for the third time to obtain a third feed liquid and third produced water, mixing the third produced water into the first feed liquid, and concentrating the third feed liquid as the fresh water obtained through nanofiltration treatment in the S4 to obtain concentrated water.
And (3) pressurizing and feeding the fresh water obtained by nanofiltration treatment in the S4 and salt-containing water formed by mixing water produced by the second reverse osmosis unit 11 into the first reverse osmosis unit 10 for treatment, wherein the conductivity of the water produced by the first reverse osmosis unit 10 is less than or equal to 100 mu S/cm and can be reused as fresh water, and a concentrated water outlet of the first reverse osmosis unit is connected with an inlet of the first reverse osmosis unit 10 and is used for mixing the feed liquid concentrated by the first reverse osmosis unit 10 and the water produced by the third reverse osmosis unit 12 and feeding the mixture into the second reverse osmosis unit 11 for further concentration treatment. The produced water of the second reverse osmosis membrane unit is sent to the first reverse osmosis unit 10 again for treatment; the second reverse osmosis membrane unit concentrate is pressurized as the third reverse osmosis unit 12 feed. Similarly, the water produced by the third reverse osmosis unit 12 is used as the inlet water of the third reverse osmosis unit 12, and the concentration of the third reverse osmosis produced water can reach more than 14%. The apparent rejection rate of the concentration treatment of the first reverse osmosis unit is more than 95 percent, the apparent rejection rate of the concentration treatment of the second reverse osmosis unit is 70 to 90 percent, and the apparent rejection rate of the concentration treatment of the third reverse osmosis unit is 50 to 70 percent.
Fresh water obtained by nanofiltration treatment in S6 and S4 can be subjected to bipolar membrane electrodialysis treatment to obtain sodium hydroxide solution and hydrochloric acid; the sodium hydroxide solution and the hydrochloric acid obtained in the step S6 are respectively used as an alkali liquor in the step S2 and an acid liquor in the step S4, the acid and the alkali generated by the bipolar membrane electrodialysis unit 15 are reused in the softening and neutralizing processes of pretreatment, the medicament cost in the treatment process is reduced, and the resource utilization of the crystallized salt is realized.
While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields suitable for the invention, and further modifications may be readily made by those skilled in the art, and the invention is therefore not limited to the specific details and embodiments shown and described herein, without departing from the general concept defined by the claims and their equivalents.
Claims (10)
1. The desulfurization wastewater treatment system is characterized by comprising a bipolar membrane electrodialysis unit (15), a pre-settling tank (1), a reaction-separation mechanism, a neutralization tank (6), an ultrafiltration unit (8), a nanofiltration unit (9), a reverse osmosis reaction mechanism, an ion exchange unit (13) and an evaporation crystallization unit (14), wherein the pre-settling tank, the reaction-separation mechanism, the neutralization tank (6), the ultrafiltration unit (8), the nanofiltration unit (9), the reverse osmosis reaction mechanism, the ion exchange unit (13) and the evaporation crystallization unit (14) are sequentially communicated, a water inlet of the bipolar membrane electrodialysis unit (15) is communicated with a concentrated water outlet of the reverse osmosis reaction mechanism through a pipeline, an acid liquor outlet of the bipolar membrane electrodialysis unit is connected with the neutralization tank (6) through a pipeline, and an alkali liquor outlet of the bipolar membrane electrodialysis unit is connected with a chemical adding port of the reaction-separation mechanism through a pipeline.
2. The desulfurization wastewater treatment system according to claim 1, wherein said reaction-separation mechanism comprises at least one set of reaction-separation unit, and when said reaction-separation mechanism comprises more than one set of said reaction-separation unit, a plurality of sets of said reaction-separation units are connected in series.
3. The desulfurization wastewater treatment system of claim 2, wherein the reaction-separation unit comprises a reaction unit and a sedimentation tank, and the liquid outlet of the reaction unit is communicated with the water inlet of the sedimentation tank through a pipeline.
4. A desulfurization waste water treatment system according to claim 3, wherein said reaction-separation mechanism comprises a first reaction unit (2), a first sedimentation tank (3), a second reaction unit (4) and a second sedimentation tank (5) which are connected in series, wherein said first reaction unit (2) and said first sedimentation tank (3) and said second reaction unit (4) and said second sedimentation tank (5) respectively constitute a set of said reaction-separation units, and the lye outlet of said bipolar membrane electrodialysis unit (15) is connected to the dosing port of said first reaction unit (2) through a pipe.
5. The desulfurization wastewater treatment system according to claim 1, further comprising a filtration unit (7) disposed between the neutralization tank (6) and the ultrafiltration unit (8), wherein a liquid inlet and a liquid outlet of the filtration unit are respectively communicated with a water outlet of the neutralization tank (6) and a liquid inlet of the ultrafiltration unit (8) through pipes.
6. The desulfurization wastewater treatment system of claim 5, wherein said filter unit is a multi-media filter.
7. The desulfurization wastewater treatment system of any one of claims 1 to 6, wherein said reverse osmosis reaction means comprises a plurality of reverse osmosis units connected in series.
8. The desulfurization wastewater treatment system of claim 7, wherein the fresh water outlet of any one of said reverse osmosis units is in communication with the water inlet of the previous one of said reverse osmosis units via a conduit.
9. The desulfurization wastewater treatment system according to claim 8, wherein the reverse osmosis reaction mechanism comprises a first reverse osmosis unit (10), a second reverse osmosis unit (11) and a third reverse osmosis unit (12) which are connected in sequence, a fresh water outlet of the second reverse osmosis unit (11) is communicated with a water inlet of the first reverse osmosis unit (10) through a pipeline, and a fresh water outlet of the third reverse osmosis unit (12) is communicated with a water inlet of the second reverse osmosis unit (11) through a pipeline.
10. A desulfurization wastewater treatment system according to claim 9, wherein said first reverse osmosis unit (10) has an apparent rejection of more than 95%, said second reverse osmosis unit (11) has an apparent rejection of 70-90%, and said third reverse osmosis unit (12) has an apparent rejection of 50-70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023113015.9U CN214299718U (en) | 2020-12-22 | 2020-12-22 | Desulfurization wastewater treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023113015.9U CN214299718U (en) | 2020-12-22 | 2020-12-22 | Desulfurization wastewater treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214299718U true CN214299718U (en) | 2021-09-28 |
Family
ID=77860421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023113015.9U Active CN214299718U (en) | 2020-12-22 | 2020-12-22 | Desulfurization wastewater treatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214299718U (en) |
-
2020
- 2020-12-22 CN CN202023113015.9U patent/CN214299718U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105254084A (en) | Desulfurization waste water bipolar membrane electrodialysis treatment method and device | |
| CN106082516B (en) | Salt separation crystallization process and device | |
| CN213652165U (en) | Polycrystalline silicon production wastewater treatment system | |
| CN212800002U (en) | High salt waste water zero release resourceful treatment equipment | |
| CN110937728A (en) | Desulfurization wastewater treatment method and system | |
| CN216639187U (en) | Treatment system for salt-containing wastewater and CO 2-containing waste gas | |
| CN113772884B (en) | Coking wastewater treatment system and method | |
| CN105481160B (en) | Method and device for preparing industrial salt by strong brine with zero discharge | |
| CN111675394A (en) | High-salt industrial wastewater resource recovery treatment system and method | |
| CN104671572A (en) | Electrodialysis softening and concentrating treatment system and method for desulfurization wastewater from thermal power plant | |
| CN112441601A (en) | System and method for extracting magnesium sulfate and sodium chloride from desulfurization wastewater | |
| CN205347089U (en) | Desulfurization wastewater treatment system | |
| CN109607582B (en) | Method and system for recovering magnesium salt from desulfurization wastewater | |
| CN108483710B (en) | Comprehensive seawater utilization method and system | |
| CN209411998U (en) | A kind of processing system of highly mineralized mine water reuse and resource utilization | |
| CN214299718U (en) | Desulfurization wastewater treatment system | |
| CN218893487U (en) | Desulfurization high-salt wastewater treatment device | |
| CN216918911U (en) | Treatment system for zero discharge and recycling of lithium iron phosphate production wastewater | |
| CN107662929B (en) | Sodium chloride and sodium sulfate separation concentration elutriation process and system in strong brine zero emission | |
| CN216129452U (en) | High salt-containing deacidification wastewater resource utilization system | |
| CN106430771B (en) | salt separation system and salt separation method | |
| CN214570785U (en) | System for extracting magnesium sulfate and sodium chloride from desulfurization wastewater | |
| CN215403455U (en) | Contain zero release pretreatment systems of salt waste water and zero release system of waste water | |
| CN214829617U (en) | Steel wet desulphurization wastewater treatment system | |
| CN112194298B (en) | System and method for recycling wastewater of whole power plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |