CN110746008A - Wastewater treatment system - Google Patents
Wastewater treatment system Download PDFInfo
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- CN110746008A CN110746008A CN201911035126.1A CN201911035126A CN110746008A CN 110746008 A CN110746008 A CN 110746008A CN 201911035126 A CN201911035126 A CN 201911035126A CN 110746008 A CN110746008 A CN 110746008A
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- CN
- China
- Prior art keywords
- wastewater
- bipolar membrane
- pretreatment
- filtering
- tank
- 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.)
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 57
- 239000002351 wastewater Substances 0.000 claims abstract description 26
- 239000012528 membrane Substances 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000003513 alkali Substances 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000012266 salt solution Substances 0.000 claims abstract description 9
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 7
- 239000011259 mixed solution Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims abstract description 4
- 238000004062 sedimentation Methods 0.000 claims description 6
- 238000005352 clarification Methods 0.000 claims description 5
- 238000005189 flocculation Methods 0.000 claims description 5
- 230000016615 flocculation Effects 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims 2
- 238000011084 recovery Methods 0.000 claims 1
- 239000006227 byproduct Substances 0.000 abstract description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 14
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000001569 carbon dioxide Substances 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 244000061176 Nicotiana tabacum Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
Abstract
The invention discloses a wastewater treatment system, which comprises a pretreatment device, a water treatment device and a water treatment device, wherein the pretreatment device is used for pretreating wastewater to remove various heavy metals and large particle impurities in the wastewater; the filtering device is connected with the pretreatment device and is used for filtering the pretreated wastewater to obtain clear water and concentrated salt solution; the bipolar membrane device is connected with the filtering device and is used for converting the salt solution into corresponding acid and alkali; and one end of the mixing reaction device is connected with the bipolar membrane device and is used for mixing and reacting the alkali and the introduced flue gas to obtain a sodium hydroxide and sodium carbonate mixed solution. The invention solves the problem of application of the bipolar membrane byproduct sodium hydroxide, and can realize wide application of the bipolar membrane in the field of wastewater treatment.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a wastewater treatment system.
Background
Along with the economic development of China, the problem of environmental pollution caused by a thermal power plant is increasingly serious, in particular toThe flue gas discharged by the thermal power plant contains a large amount of SO2And atmospheric pollutants such as NOx and particulate matters, the pollution treatment condition of the coal-fired power plant by the nation and the society is continuously concerned. In recent years, the bipolar membrane technology compounded by anion and cation exchange layers is rapidly developed and is adopted in more terminal water treatment processes, and a byproduct NaOH has a high recycling value. On the other hand, coal-fired thermal power plants are also the largest carbon dioxide emission source in the world and account for 30% of the total amount of newly increased global emissions. CO in flue gas discharged from coal-fired power plant2The content is generally between 10 and 15%. How to reasonably and effectively apply the waste gas of the tobacco plant and the bipolar membrane byproduct sodium hydroxide, and create certain economic benefit and social value while realizing the resource utilization of the discharged waste becomes a problem to be deeply researched.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a wastewater treatment system aiming at the defects of the prior art, solves the problem of application of a bipolar membrane byproduct sodium hydroxide, and can realize wide application of the bipolar membrane in the field of wastewater treatment.
The technical scheme is as follows: the invention relates to a wastewater treatment system, which comprises a pretreatment device, a water treatment device and a water treatment device, wherein the pretreatment device is used for pretreating wastewater to remove various heavy metals and large particle impurities in the wastewater;
the filtering device is connected with the pretreatment device and is used for filtering the pretreated wastewater to obtain clear water and concentrated salt solution;
the bipolar membrane device is connected with the filtering device and is used for converting the salt solution into corresponding acid and alkali;
and one end of the mixing reaction device is connected with the bipolar membrane device and is used for mixing and reacting the alkali and the introduced flue gas to obtain a sodium hydroxide and sodium carbonate mixed solution.
Preferably, the other end of the mixed reaction device is connected to the pretreatment device and is used for reacting with the wastewater, adjusting the pH value of the wastewater and removing various heavy metal ions in the wastewater.
Preferably, the filtration device is a multi-stage filtration device.
Preferably, the clear water obtained in the filtering device is recycled.
Preferably, the pretreatment device comprises a primary sedimentation tank, an aeration tank, a softening tank, a flocculation tank and a clarification tank which are connected in sequence.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the integration of the pretreatment device, the filtering device, the bipolar membrane device and the mixed reaction device is utilized, so that the aim of preparing the de-hardening agent by absorbing carbon dioxide in flue gas by using the bipolar membrane byproduct sodium hydroxide is achieved, the problem of the application of the bipolar membrane byproduct sodium hydroxide is solved, and the wide application of the bipolar membrane in the field of wastewater treatment can be realized. The self-produced low-concentration sodium hydroxide solution of the bipolar membrane acid and alkali is used for absorbing carbon dioxide in flue gas discharged by a thermal power plant, and further, the obtained sodium hydroxide and sodium carbonate mixture can be used as a de-hardening agent to replace outsourced sodium hydroxide and sodium carbonate, so that the pollution of carbon dioxide discharge to the environment can be reduced to a certain extent, and the method also has the value of 'waste utilization and waste treatment by waste'.
Drawings
FIG. 1 is a block diagram of a wastewater treatment system according to an embodiment of the present invention.
In the attached figure, 1-pretreatment device, 2-multistage filtration device, 3-bipolar membrane device, 4-mixed reaction device, 5-clear water, 6-acid, 7-alkali, 8-flue gas and 9-hardening agent.
Detailed Description
The technical solution of the present invention is described in detail below with reference to specific examples and drawings, but the scope of the present invention is not limited to the examples.
Examples
A wastewater treatment system, referring to fig. 1, comprises a pretreatment device 1, which comprises a primary sedimentation tank, an aeration tank, a softening tank, a flocculation tank and a clarification tank which are connected in sequence and are used for carrying out primary sedimentation, aeration, softening, flocculation and clarification pretreatment on wastewater to remove various heavy metals and large-particle impurities in the wastewater;
the multistage filtering device 2 is connected to the pretreatment device 1 and is used for filtering the pretreated wastewater to obtain clear water 5 and concentrated salt solution, and the clear water 5 is recycled;
a bipolar membrane device 3 connected to the filtration device 2 for converting the salt solution into the corresponding acid 6 and base 7;
and one end of the mixed reaction device 4 is connected with the bipolar membrane device 3 and is used for carrying out mixed reaction on alkali 7 and the introduced flue gas 8 to obtain a sodium hydroxide and sodium carbonate mixed solution serving as a hardening agent 9, and the other end of the mixed reaction device is connected with the pretreatment device 1 and is used for reacting the hardening agent 9 with the wastewater, adjusting the pH value of the wastewater and removing various heavy metal ions in the wastewater.
The preparation process of this example is as follows:
s1, conveying the wastewater to a pretreatment device 1 through a conveying pump, adding a de-hardening agent into the primary sedimentation of the pretreatment device 1, adjusting the pH value of the wastewater to 12.5, and carrying out stirring reaction to generate CaCO3Precipitation and Mg (OH)2Carrying out precipitation separation after precipitation;
s2, further pretreating the softened and pretreated wastewater in a pretreatment device 1 by flocculation, sedimentation, filtration and clarification and the like, and then sending the pretreated wastewater into a multistage filtration device 2;
s3, performing microfiltration, nanofiltration and reverse osmosis treatment on the wastewater in a multistage filtering device 2 to respectively form strong brine and clear water, sending the strong brine to a bipolar membrane device 3, and using the clear water for replenishing water for preparing acid and alkali and recycling water for a power plant;
s4, converting the salt in the salt solution into 5wt% hydrochloric acid and 3wt% sodium hydroxide solution in the bipolar membrane device 3;
s5, reacting the sodium hydroxide solution with carbon dioxide in the introduced flue gas in a mixing reaction device 4 to generate a mixed solution of 5wt% sodium hydroxide solution and 1wt% sodium carbonate solution, and putting the mixed solution into a pretreatment device 1 as a de-hardening agent.
In the embodiment, the self-produced low-concentration sodium hydroxide solution of the bipolar membrane acid and alkali is used for absorbing carbon dioxide in the flue gas discharged by the thermal power plant, and further, the obtained sodium hydroxide and sodium carbonate mixture can be used as a de-hardening agent to replace outsourced sodium hydroxide and sodium carbonate, so that the pollution of carbon dioxide discharge to the environment can be reduced to a certain extent, and the method also has the value of 'waste utilization and waste treatment by waste'.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A wastewater treatment system is characterized by comprising a pretreatment device, a sewage treatment device and a sewage treatment device, wherein the pretreatment device is used for pretreating wastewater to remove various heavy metals and large particle impurities in the wastewater;
the filtering device is connected with the pretreatment device and is used for filtering the pretreated wastewater to obtain clear water and concentrated salt solution;
the bipolar membrane device is connected with the filtering device and is used for converting the salt solution into corresponding acid and alkali;
and one end of the mixing reaction device is connected with the bipolar membrane device and is used for mixing and reacting the alkali and the introduced flue gas to obtain a sodium hydroxide and sodium carbonate mixed solution.
2. The water treatment device of claim 1, wherein the other end of the mixing reaction device is connected to the pretreatment device for reacting with the wastewater, adjusting the pH value of the wastewater and removing various heavy metal ions in the wastewater.
3. A water treatment device according to claim 1 or 2, wherein the filtration device is a multi-stage filtration device.
4. A water treatment device according to claim 1 or 2, wherein the clean water obtained in the filter device is subjected to a recovery treatment.
5. The water treatment apparatus according to claim 1 or 2, wherein the pretreatment apparatus comprises a primary sedimentation tank, an aeration tank, a softening tank, a flocculation tank and a clarification tank which are connected in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911035126.1A CN110746008A (en) | 2019-10-29 | 2019-10-29 | Wastewater treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911035126.1A CN110746008A (en) | 2019-10-29 | 2019-10-29 | Wastewater treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110746008A true CN110746008A (en) | 2020-02-04 |
Family
ID=69280626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911035126.1A Pending CN110746008A (en) | 2019-10-29 | 2019-10-29 | Wastewater treatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110746008A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114906957A (en) * | 2022-05-31 | 2022-08-16 | 宝武水务科技有限公司 | Concentrated brine recycling treatment method and treatment system |
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|---|---|---|---|---|
| JP2006131982A (en) * | 2004-11-09 | 2006-05-25 | Jfe Steel Kk | Treatment method for pickling waste solution and treatment device for pickling waste solution |
| CN105906114A (en) * | 2016-07-05 | 2016-08-31 | 中国科学技术大学 | Bipolar membrane electrodialysis system for treating saliferous organic amine waste water by using carbon dioxide and process thereof |
| CN108975570A (en) * | 2018-09-19 | 2018-12-11 | 南京友智科技有限公司 | A kind of device and method handling industrially desulfurized waste water using stack gases |
| CN110104851A (en) * | 2019-06-04 | 2019-08-09 | 北京赛科康仑环保科技有限公司 | One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method |
| CN211004912U (en) * | 2019-10-29 | 2020-07-14 | 南京友智科技有限公司 | Wastewater treatment system |
-
2019
- 2019-10-29 CN CN201911035126.1A patent/CN110746008A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006131982A (en) * | 2004-11-09 | 2006-05-25 | Jfe Steel Kk | Treatment method for pickling waste solution and treatment device for pickling waste solution |
| CN105906114A (en) * | 2016-07-05 | 2016-08-31 | 中国科学技术大学 | Bipolar membrane electrodialysis system for treating saliferous organic amine waste water by using carbon dioxide and process thereof |
| CN108975570A (en) * | 2018-09-19 | 2018-12-11 | 南京友智科技有限公司 | A kind of device and method handling industrially desulfurized waste water using stack gases |
| CN110104851A (en) * | 2019-06-04 | 2019-08-09 | 北京赛科康仑环保科技有限公司 | One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method |
| CN211004912U (en) * | 2019-10-29 | 2020-07-14 | 南京友智科技有限公司 | Wastewater treatment system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114906957A (en) * | 2022-05-31 | 2022-08-16 | 宝武水务科技有限公司 | Concentrated brine recycling treatment method and treatment system |
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Application publication date: 20200204 |