CN211004912U - Wastewater treatment system - Google Patents
Wastewater treatment system Download PDFInfo
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- CN211004912U CN211004912U CN201921829000.7U CN201921829000U CN211004912U CN 211004912 U CN211004912 U CN 211004912U CN 201921829000 U CN201921829000 U CN 201921829000U CN 211004912 U CN211004912 U CN 211004912U
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Abstract
The utility model 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 utility model provides a usage problem of bipolar membrane accessory substance sodium hydroxide, can realize the wide application of bipolar membrane in the waste water treatment field.
Description
Technical Field
The utility model relates to a waste water treatment field, concretely relates to waste water treatment system.
Background
Along with the economic development of China, the problem of environmental pollution caused by a thermal power plant is increasingly serious, and particularly, 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 utility model aims to provide a waste water treatment system to prior art not enough, solved bipolar membrane accessory substance sodium hydroxide's usage problem, can realize the wide application of bipolar membrane in the waste water treatment field.
The technical scheme is as follows: the utility model relates to a wastewater treatment system, which comprises a pretreatment device, a water tank;
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 beneficial effects of the utility model are that: the utility model discloses utilize preprocessing device, filter equipment, bipolar membrane device and mixed reaction unit's integration, reach and utilize bipolar membrane by-product sodium hydroxide to absorb carbon dioxide preparation in the flue gas and take off the hard agent purpose, solved bipolar membrane by-product sodium hydroxide usage problem, can realize the wide application of bipolar membrane in the waste water treatment field. The utility model discloses be used for absorbing the carbon dioxide in the thermal power factory discharges the flue gas with bipolar membrane acid-base's the low concentration sodium hydroxide solution of producing certainly, further, the sodium hydroxide and the sodium carbonate mixture that obtain can be used to replace the use of purchasing sodium hydroxide and sodium carbonate outward as the unhardening agent, can also reduce carbon dioxide to a certain extent and discharge the pollution to the environment, still have "waste utilization, with useless value of treating waste".
Drawings
FIG. 1 is a diagram showing 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 the specific embodiments and the attached drawings, but the scope of the present invention is not limited to the embodiments.
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 mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. 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 wastewater treatment system 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. The wastewater treatment system of claim 1 or 2, wherein the filtration device is a multi-stage filtration device.
4. The wastewater treatment system according to claim 1 or 2, wherein the clean water obtained in the filtration device is subjected to a recovery treatment.
5. The wastewater treatment system 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 |
|---|---|---|---|
| CN201921829000.7U CN211004912U (en) | 2019-10-29 | 2019-10-29 | Wastewater treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921829000.7U CN211004912U (en) | 2019-10-29 | 2019-10-29 | Wastewater treatment system |
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| CN211004912U true CN211004912U (en) | 2020-07-14 |
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| CN201921829000.7U Active CN211004912U (en) | 2019-10-29 | 2019-10-29 | Wastewater treatment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110746008A (en) * | 2019-10-29 | 2020-02-04 | 南京友智科技有限公司 | Wastewater treatment system |
| 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 |
-
2019
- 2019-10-29 CN CN201921829000.7U patent/CN211004912U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110746008A (en) * | 2019-10-29 | 2020-02-04 | 南京友智科技有限公司 | Wastewater treatment system |
| 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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Effective date of registration: 20220415 Address after: 210000 Room 903, floor 9, block n, Himalayan business center, No. 3, Minzhi Road, Yuhua street, Yuhuatai District, Nanjing, Jiangsu Province Patentee after: Jiangsu Baoxin Technology Research Institute Co.,Ltd. Address before: 210012 west part and third floor of Building 9, Wangu mobile Internet technology park, No. 16, Xiaoxing Road, Yuhuatai District, Nanjing, Jiangsu Province Patentee before: NANJING YOUZHI TECHNOLOGY Co.,Ltd. |
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