CN111924992A - Treatment method of salt-containing industrial sewage - Google Patents
Treatment method of salt-containing industrial sewage Download PDFInfo
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- CN111924992A CN111924992A CN202010862915.9A CN202010862915A CN111924992A CN 111924992 A CN111924992 A CN 111924992A CN 202010862915 A CN202010862915 A CN 202010862915A CN 111924992 A CN111924992 A CN 111924992A
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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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
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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
- 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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- 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
- C02F2103/343—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the pharmaceutical industry, e.g. containing antibiotics
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of sewage treatment, and particularly relates to a method for treating salt-containing industrial sewage, which comprises a plurality of steps of primary treatment, security filtration, reverse osmosis, crystallization and salt extraction, and is used for carrying out multistage treatment on the sewage, simple in operation, controllable in process flow, free of pollutants, capable of selling finally obtained industrial salt, capable of recycling ice water and percolate, good in economic benefit, high in production efficiency, simple in process, easy to realize, low in operation cost, capable of meeting sustainable development requirements, and capable of being widely applied to actual industrial production processes.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a treatment method of salt-containing industrial sewage.
Background
A large amount of wastewater with high salt content is generated in the industrial production of chemical industry, printing and dyeing, medicine, food and the like, and the emission of the wastewater can cause serious pollution to the environment. Therefore, how to treat high-salinity wastewater has become a hot point of research. In recent years, the industrial capacity of the sewage treatment industry has changed qualitatively, and the qualitative change mainly relates to two aspects, namely the number of sewage treatment plants is rapidly increased, and the overall treatment capacity is rapidly increased. However, the treatment effect of the industrial saline sewage at present cannot reach the expected index, the environment is easily polluted, the waste of the medicament is caused, and the cost of sewage treatment is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for treating industrial saline sewage, aiming at solving the technical problems that the treatment effect of the industrial saline sewage at present cannot reach the expected index, the environment is easily polluted, the waste of medicaments is caused, and the cost of sewage treatment is increased.
The invention provides a method for treating industrial sewage containing salt, which has the following specific technical scheme:
the treatment method of the salt-containing industrial sewage comprises the following steps:
s1, primary processing: sending the sewage into a primary treatment tank for filtering to remove suspended matters, and adjusting the pH value;
s2, security filtering: sending the sewage subjected to the primary treatment in the step S1 into a security filter, and removing particles with the diameter larger than 0.5 mu m in the sewage;
s3, reverse osmosis: the sewage after security filtration in the step S2 is sent into a reverse osmosis system for filtration, and the filtered crude water reaches the discharge standard for discharge;
s4, crystallization: sending the product liquid intercepted by reverse osmosis filtration in the step S3 into a crystallization tank, cooling and crystallizing to ensure that crystallized salt is separated out to obtain a salt/ice mixture containing mother liquid;
s5, salt extraction: and (3) sending the salt/ice mixture containing the mother liquor in the step (S4) into a settling tank for settling treatment, separating crystallized salt from ice water, centrifuging the crystallized salt to obtain industrial salt and leachate, centrifuging the ice water to obtain ice and the leachate, and recycling the ice and the leachate.
In some embodiments, in step S1, the mixture is sequentially treated with 50g/L lime, 100g/L sodium carbonate and 2g/L polyaluminum chloride, and pH is adjusted by 10% sulfuric acid.
In some embodiments, in step S2, the sewage after the primary treatment in step S1 is sent to a cartridge filter after being stored in an intermediate water tank.
In some embodiments, the ice in step S5 is dissolved and then sent to the intermediate tank to be mixed with the filtered sewage in step S2.
In some embodiments, the temperature of the product liquid intercepted by reverse osmosis filtration in the step S4 is reduced to 10-20 ℃ in the feeding tank, then the product liquid is sent to the buffer tank to be cooled to-5-0 ℃ and then sent to the crystallization tank, and the temperature of the crystallization tank is-7 to-12 ℃.
In certain embodiments, in step S5, the leachate is sent to the surge tank to be mixed with the product liquid retained by reverse osmosis filtration.
In certain embodiments, the temperature of the settling tank is between-7 ℃ and-10 ℃ in step S5.
In some embodiments, after settling, the crystallized salt is pumped through a hose to a salt separator, and the ice water is pumped through a screw to an ice separator in step S5.
The invention has the following beneficial effects: the invention sets a plurality of treatment steps of preliminary treatment, security filtration, reverse osmosis, crystallization and salt extraction, carries out multi-stage treatment on the sewage, has simple operation, controllable process flow and no pollutant, can sell the finally obtained industrial salt, can recycle the ice water and the percolate, has good economic benefit, high production efficiency, simple flow, easy realization and low operation cost, meets the sustainable development requirement, and can be widely applied to the actual industrial production process.
Drawings
FIG. 1 is a flow chart of a method for treating industrial sewage containing salt according to the present invention;
FIG. 2 is a layout diagram corresponding to the method for treating industrial wastewater containing salt according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings 1-2 in conjunction with specific embodiments.
As shown in figure 1, the specific technical scheme of the method for treating salt-containing industrial sewage provided by the invention is as follows:
the treatment method of the salt-containing industrial sewage comprises the following steps:
s1, primary processing: the sewage is sent into a primary treatment tank to be sequentially mixed and stirred by 50g/L lime, 100g/L sodium carbonate and 2g/L polyaluminium chloride to remove suspended matters. Then the sewage is subjected to pH adjustment by using 10% sulfuric acid.
S2, security filtering: and (4) sending the primarily treated sewage into an intermediate water tank for water storage. And (3) feeding the sewage in the middle water tank into a security filter to remove particles with the diameter larger than 0.5 mu m in the sewage.
S3, reverse osmosis: and (4) sending the sewage after security filtration into a reverse osmosis system for filtration, and discharging the filtered crude water which reaches the discharge standard. The maximum bearing pressure of the reverse osmosis membrane in the invention reaches 38 kg. The temperature of the product liquid intercepted by reverse osmosis filtration enters a feeding tank and is reduced to 10-20 ℃, and then the product liquid is sent into a buffer tank and is reduced to-5-0 ℃.
S4, crystallization: and (4) delivering the product liquid intercepted by the reverse osmosis filtration in the step S3 into a crystallization tank, and cooling and crystallizing, wherein the temperature of the crystallization tank is-7 to-12 ℃. Precipitating the crystallized salt to obtain a salt/ice mixture containing a mother liquor;
s5, salt extraction: and (4) sending the salt/ice mixture containing the mother liquor in the step (S4) into a settling tank for settling treatment, separating crystallized salt and ice water, sending the crystallized salt to a salt separator through a hose pump, centrifuging to obtain industrial salt and leachate, sending the ice water to an ice separator through a screw pump, centrifuging to obtain ice and leachate, and recycling the ice and the leachate. The industrial salt is sodium sulfate which can be directly packaged and sold under the general condition, the leachate flows back to the buffer tank to continue crystallization and salt extraction, ice water is melted by the ice melting tank, and the ice water can be used for preliminary cooling through the heat exchanger of the feeding tank and then flows into the intermediate water tank.
The flow process of sewage is as shown in fig. 2, sewage flows into the preliminary treatment pond earlier, later flows into in the middle water tank and impounds, flows into the cartridge filter again, and the sewage that flows out from the cartridge filter is sent into reverse osmosis system, and the thick water that filters out is discharged, and the thick water that holds back flows through feed tank, buffer tank in proper order and carries out preliminary cooling, later gets into the crystallizer and carries out the terminal cooling crystallization, obtains the salt \ ice mixture that contains the mother liquor. And the salt/ice mixture containing the mother solution enters a sedimentation tank for sedimentation, the density of ice water is small, ice and leachate are obtained by centrifugation after the ice water is pumped to an ice separator through a screw rod from the upper part of the sedimentation tank, the density of crystal salt is large, the crystal salt is pumped to a salt separator through a hose from the lower part of the sedimentation tank, and industrial salt and leachate are obtained by centrifugation. And (3) refluxing the percolate to the buffer tank to continuously extract salt, melting ice water through the ice melting tank, flowing through the heat exchanger of the feeding tank for preliminary cooling, and then flowing into the intermediate water tank to continuously and circularly extract salt.
The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be construed as limiting the invention, and the present invention is not limited to the above examples, and those skilled in the art should also be able to make various changes, modifications, additions or substitutions within the spirit and scope of the present invention.
Claims (8)
1. The method for treating the salt-containing industrial sewage is characterized by comprising the following steps of:
s1, primary processing: sending the sewage into a primary treatment tank for filtering to remove suspended matters, and adjusting the pH value;
s2, security filtering: sending the sewage subjected to the primary treatment in the step S1 into a security filter, and removing particles with the diameter larger than 0.5 mu m in the sewage;
s3, reverse osmosis: the sewage after security filtration in the step S2 is sent into a reverse osmosis system for filtration, and the filtered crude water reaches the discharge standard for discharge;
s4, crystallization: sending the product liquid intercepted by reverse osmosis filtration in the step S3 into a crystallization tank, cooling and crystallizing to ensure that crystallized salt is separated out to obtain a salt/ice mixture containing mother liquid;
s5, salt extraction: and (3) sending the salt/ice mixture containing the mother liquor in the step (S4) into a settling tank for settling treatment, separating crystallized salt from ice water, centrifuging the crystallized salt to obtain industrial salt and leachate, centrifuging the ice water to obtain ice and the leachate, and recycling the ice and the leachate.
2. The method for treating industrial sewage containing salt according to claim 1, wherein in step S1, the mixture is sequentially treated with lime 50g/L, sodium carbonate 100g/L and polyaluminium chloride 2g/L by mixing and stirring, and the pH is adjusted by using 10% sulfuric acid.
3. The method for treating industrial sewage containing salt according to claim 1, wherein in step S2, the sewage after the preliminary treatment in step S1 is sent to a cartridge filter after being stored in an intermediate water tank.
4. The method for treating industrial sewage containing salt according to claim 3, wherein the ice in step S5 is dissolved and then sent to the intermediate water tank to be mixed with the sewage filtered by the security guard of step S2.
5. The method for treating industrial wastewater containing salt according to claim 1, wherein in step S4, the temperature of the product liquid intercepted by reverse osmosis filtration in step S3 is reduced to 10-20 ℃ in a feeding tank, then the product liquid is sent to a buffer tank to be cooled to-5-0 ℃ and then sent to a crystallization tank, and the temperature of the crystallization tank is-7 to-12 ℃.
6. The method for treating industrial sewage containing salt according to claim 5, wherein the percolate is sent to the buffer tank and mixed with the production liquid retained by reverse osmosis filtration in step S5.
7. The method for treating industrial sewage containing salt according to claim 1, wherein the temperature of the sedimentation tank is-7 to-10 ℃ in step S5.
8. The method for treating industrial wastewater containing salt according to claim 1, wherein in step S5, after the sedimentation treatment, the crystallized salt is pumped to a salt separator through a hose, and the ice water is pumped to an ice separator through a screw.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010862915.9A CN111924992A (en) | 2020-08-25 | 2020-08-25 | Treatment method of salt-containing industrial sewage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010862915.9A CN111924992A (en) | 2020-08-25 | 2020-08-25 | Treatment method of salt-containing industrial sewage |
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| CN111924992A true CN111924992A (en) | 2020-11-13 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040060322A1 (en) * | 1999-10-22 | 2004-04-01 | Geert-Jan Witkamp | Crystallisation of materials from aqueous solutions |
| US20140374361A1 (en) * | 2011-10-04 | 2014-12-25 | Technische Universiteit Delft | Treatment of aqueous solutions |
| CN104803433A (en) * | 2015-04-22 | 2015-07-29 | 中科合成油技术有限公司 | Method of freezing, concentrating and treating saline wastewater |
| CN208055134U (en) * | 2017-12-29 | 2018-11-06 | 四川锐源能环科技有限公司 | A kind of heavy chemical industry organic waste-water treating apparatus with high salt |
| CN109574334A (en) * | 2018-12-20 | 2019-04-05 | 中科合成油技术有限公司 | The method that a kind of pair of strong brine carries out depth concentration and separation of solid and liquid |
| CN111018030A (en) * | 2019-12-17 | 2020-04-17 | 华新绿源环保股份有限公司 | Process for desalting high-salt water and treating sewage through freezing phase change |
-
2020
- 2020-08-25 CN CN202010862915.9A patent/CN111924992A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040060322A1 (en) * | 1999-10-22 | 2004-04-01 | Geert-Jan Witkamp | Crystallisation of materials from aqueous solutions |
| US20140374361A1 (en) * | 2011-10-04 | 2014-12-25 | Technische Universiteit Delft | Treatment of aqueous solutions |
| CN104803433A (en) * | 2015-04-22 | 2015-07-29 | 中科合成油技术有限公司 | Method of freezing, concentrating and treating saline wastewater |
| CN208055134U (en) * | 2017-12-29 | 2018-11-06 | 四川锐源能环科技有限公司 | A kind of heavy chemical industry organic waste-water treating apparatus with high salt |
| CN109574334A (en) * | 2018-12-20 | 2019-04-05 | 中科合成油技术有限公司 | The method that a kind of pair of strong brine carries out depth concentration and separation of solid and liquid |
| CN111018030A (en) * | 2019-12-17 | 2020-04-17 | 华新绿源环保股份有限公司 | Process for desalting high-salt water and treating sewage through freezing phase change |
Non-Patent Citations (3)
| Title |
|---|
| 巩耀武等 编: "《火力发电厂化学水处理实用技术》", 31 August 2006, 中国电力出版社 * |
| 张希衡 主编: "《水污染控制工程 （修订版）》", 30 April 1993, 冶金工业出版社 * |
| 赵文玉等 主编: "《工业水处理技术》", 31 May 2019, 电子科技大学出版社 * |
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Application publication date: 20201113 |