CN114314912B - Method for treating carbon five resin wastewater - Google Patents
Method for treating carbon five resin wastewater Download PDFInfo
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- CN114314912B CN114314912B CN202111589195.4A CN202111589195A CN114314912B CN 114314912 B CN114314912 B CN 114314912B CN 202111589195 A CN202111589195 A CN 202111589195A CN 114314912 B CN114314912 B CN 114314912B
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Abstract
The invention discloses a method for treating carbon five resin wastewater, which belongs to the technical field of wastewater treatment and mainly solves the technical problems of pipeline corrosion and blockage at the downstream of a carbon five resin production system and environmental pollution caused by paralysis of a sewage treatment system in the prior art. The method for treating the carbon five resin wastewater provided by the invention avoids the corrosion and blockage of a pipeline at the downstream of a carbon five resin production system, and reduces the risk of paralysis and environmental pollution of the downstream sewage biochemical treatment system.
Description
Technical Field
The invention relates to a wastewater treatment technology, in particular to a method for treating carbon five resin wastewater.
Background
In the production process of the carbon five petroleum resin, catalyst is added into the raw material of the polymerization kettle according to a certain proportion, the carbon five hydrocarbon is polymerized at a certain temperature through the catalysis of the catalyst, and the polymerized material is mixed with water and a certain amount of alkali liquor to remove the catalyst in the polymerization liquid, so that the wastewater from the polymerization liquid is alkaline.
In order to meet the requirement of the operation of the device, the PH value of the waste water discharged in the alkaline washing process is regulated to be strong alkaline, the PH value of the waste water discharged reaches between 12.5 and 13.0, the generated alkaline waste water is mainly generated by neutralizing an acidic catalyst by sodium hydroxide, and the waste water mainly contains substances such as sodium hydroxide, aluminum hydroxide, sodium metaaluminate and the like, and contains Al 3+ 、Cl - 、OH - 、Na + The plasma has high salinity, the conductivity reaches 30000-35000us/cm, and the COD reaches 1000mg/L. The wastewater is not treated, so that not only is the pipeline of the downstream of the system corroded and blocked, but also the downstream sewage biochemical treatment system is paralyzed, and the environmental pollution and the like are caused. If the PH value of the alkaline elution catalyst system of the carbon five resin device is regulated down in the production process, the pipeline of the alkaline washing system is scaled and blocked, and the operation period is influenced.
At present, waste water generated by carbon five petroleum resins is subjected to neutralization treatment by dripping relevant acids through arranging a high-saline-alkali water neutralization tank treatment device, and after a large amount of suspended matters are generated, flocculating agents are added to enable the suspended matters to be coagulated and then to be precipitated, but after the flocculating agents are added, COD (chemical oxygen demand) contained in the waste water is correspondingly increased, and the treatment of the waste water is seriously influenced. The suspended matters which are not coagulated by the flocculating agent cannot be thoroughly filtered or centrifugally separated, and the like, and even if a neutralization precipitation system is arranged in the existing high-salt-alkali water treatment equipment, a large amount of suspended matters are generated, the suspended matters cannot be separated, and clear water on the upper layer of the suspended matters can only be discharged after the suspended matters are naturally settled for a long time, but the required settlement field and the required settlement time are very large, the requirements of chemical enterprises with continuous production requirements are not met, and part of sediment can be carried by discharged water to cause serious pollution to surrounding water bodies and influence the scaling of sewage pipelines.
Disclosure of Invention
The invention aims to provide a method for treating carbon five resin wastewater. The corrosion and blockage of a downstream pipeline of the carbon five resin production system are avoided, and the risk of paralysis and environmental pollution of a downstream sewage biochemical treatment system is reduced.
The technical scheme for realizing the aim of the invention is as follows: a method for treating carbon five resin wastewater, comprising the following steps:
(1) Discharging the wastewater produced by the carbon five resin device, namely high-salt alkaline water, to an oil separation tank for oil separation, separating grease and impurities in the wastewater, and flowing to a neutralization tank;
(2) Adding concentrated sulfuric acid dropwise into high-salt alkaline water in a neutralization tank while stirring, and neutralizing wastewater in the tank until the pH value is 7.0-8.0 to obtain high-salt water and aluminum hydroxide precipitate;
(3) Filtering the high-salt water to obtain filtrate and aluminum hydroxide powder;
(4) And sending the filtrate to a downstream oil separation tank for treatment, and then discharging the filtrate to a clean water tank.
The method provided by the invention comprises the steps of firstly discharging the wastewater produced by the carbon five resin device into an oil separation tank for oil separation treatment, separating resin gel floaters, heavy oil and other solid matters in the high-salt wastewater, and then neutralizing the wastewater in a neutralization tank by using concentrated sulfuric acid until the pH value is 7.0-8.0, so that the aluminum hydroxide in the wastewater is precipitated, and carrying out solid-liquid separation by a filtering means, thereby completing the wastewater treatment of the carbon five resin device.
In the step (1), the oil separation tank is provided with a plurality of layers of water seal type oil separation chambers.
In the step (1), the positions of the oil separation tank and the neutralization tank are provided with fall, namely the height of the neutralization tank is lower than that of the oil separation tank, and high saline-alkali water automatically flows into the neutralization tank by gravity.
In the step (1), a stirrer is arranged in the neutralization tank, and a motor used by the stirrer is an explosion-proof variable-frequency motor, and the rotating speed is adjustable.
In the present invention, the concentrated sulfuric acid is added dropwise by a metering pump. As one example, concentrated sulfuric acid is placed in a metering tank, and the concentrated sulfuric acid is pumped by a metering pump for dropwise addition.
And (2) determining the high-salt wastewater treatment effect, wherein in the dripping process, if the dripping speed is too high, the precipitation effect of aluminum hydroxide is deteriorated to generate gel floccules, the gel floccules cannot be completely filtered, and the content of the aluminum hydroxide water after filter pressing is high, so that the follow-up treatment and the operation period of a filter press are influenced. The step (2) of the invention is to drop concentrated sulfuric acid in batches, namely, drop a small amount of concentrated sulfuric acid for multiple times, and gradually adjust the pH value of the wastewater, so that the liquid becomes milky suspension after the neutralization of the wastewater, and the excessive use of the concentrated sulfuric acid can be avoided. Specifically, the first time of adding concentrated sulfuric acid dropwise until the pH value of the wastewater is reduced to 12, the second time of adding concentrated sulfuric acid dropwise until the pH value of the wastewater is reduced to 11.5, the third time of adding concentrated sulfuric acid dropwise until the pH value of the wastewater is reduced to 10.5, the fourth time of adding concentrated sulfuric acid dropwise until the pH value of the wastewater is reduced to 9.5, the fifth time of adding concentrated sulfuric acid dropwise until the pH value of the wastewater is reduced to 8.7, the sixth time of adding concentrated sulfuric acid dropwise until the pH value of the wastewater is reduced to 8.2, and finally the third time of adding concentrated sulfuric acid dropwise until the pH value of the wastewater is reduced to about 7.0-8.0.
In the step (2), the dropping position of the concentrated sulfuric acid is 0.2-0.5m outside the radius of the stirring paddle.
In the step (2), the adding interval time and the adding amount of the concentrated sulfuric acid are strictly limited. In one embodiment, the pH is measured after stirring for 5-10 minutes after each exact addition of concentrated sulfuric acid.
In the step (3), a filter press is adopted for filter pressing. The filter press is a filter cloth suction plate filter press.
Compared with the prior art, the invention has the advantages that:
1. according to the method for treating the carbon five resin wastewater, provided by the invention, the pH value in the wastewater is effectively controlled by controlling the dropping amount and the dropping mode of the concentrated sulfuric acid, so that the aluminum hydroxide in the high-salt wastewater is precipitated as white particles, gel floccules are not generated, and a flocculating agent is not required to be added in the subsequent process, and the solid-liquid separation is realized by directly filtering. .
2. The invention not only avoids the corrosion and blockage of the downstream pipeline of the carbon five resin production system, but also reduces the risk of paralysis of the downstream sewage biochemical treatment system and environmental pollution.
3. According to the method for treating the carbon five resin wastewater, provided by the invention, the purer aluminum hydroxide solid is produced by press filtration for further processing, so that the generation of industrial solid waste can be reduced, the industrial solid waste is converted into an industrial utilization product, the waste is turned into wealth, and the secondary income of enterprises is increased.
4. According to the method for treating the carbon five resin wastewater, various indexes of the high-salt-alkali water wastewater meet the requirements of downstream wastewater treatment, the quality standard of the delivered water is ensured to be qualified, and meanwhile, the replacement water consumption of fresh water is reduced, so that energy conservation and consumption reduction are realized.
5. The method for treating the carbon five resin wastewater ensures the strong alkaline requirement of the PH value in the alkaline washing process in the operation of the device, prevents the scaling and blocking of the pipeline of the production device and effectively improves the operation period of the device.
Drawings
FIG. 1 is a schematic diagram of a carbon five resin wastewater treatment plant.
Wherein: 1-oil separation tank, 2-neutralization tank, 3-filter press, 4-oil separation tank, 5-clean water tank and 6-sulfuric acid tank.
Detailed Description
The invention will be further illustrated with reference to specific examples.
First, a carbon five resin wastewater treatment system is provided, and as shown in fig. 1, an oil separation tank 1, a neutralization tank 2, a filter press 3 and an oil separation tank 4 are provided in this order in the water flow direction, and finally, the wastewater flows into a clean water tank 5. Wherein, the neutralization tank 2 is provided with a dripping device and a stirrer, and the filter press 3 is provided with a filter press. The dripping device comprises a metering tank and a metering pump which are connected through a medicine inlet pipe and are provided with a liquid level meter, the medicine inlet pipe connected with the output port of the metering pump stretches into the neutralization pond, and the outlet of the medicine inlet pipe is positioned outside the radius of the stirring paddle of the stirrer and is approximately at a position 0.2-0.5m away from the stirring paddle of the stirrer. The liquid level meter of the metering tank is a millimeter-level precision glass tube liquid level meter, and can meter the adding amount of the concentrated sulfuric acid. The interval between every two adjacent liquid level marks on the liquid level meter of the metering tank is one lattice, and each lattice liquid level represents 5.02L. The oil separation tank 1 is provided with a plurality of layers of water seal type oil separation chambers. The geographic position of the neutralization tank 2 is lower than that of the oil separation tank 1, namely, the two have a fall, and gravity is utilized to flow into the neutralization tank 2 automatically. 2 pneumatic pumps are arranged between the neutralization tank 2 and the filter press 3, and the neutralized water is sent to the filter press 3 for filter pressing.
(1) The waste water from the carbon five resin production device, namely high-salt alkaline water, has the pH value of 12.5-13.0, the conductivity of 30000-35000us/cm and the COD of 1000mg/L, firstly enters an oil separation tank 1 with a multi-layer water seal type oil separation chamber for standing separation, resin gel floaters, heavy oil and other grease substances in the waste water float on the water surface, and the water at the lower layer flows into a neutralization tank 2 by using the fall between the oil separation tank and the neutralization tank 2 under the action of gravity.
(2) The concentrated sulfuric acid in the metering tank is added into the wastewater in the neutralization tank 2 by a metering pump in a small amount for a plurality of times, the pH of the wastewater is neutralized to 7.0-8.0, and the wastewater is in a milky suspension.
The high-salt-alkali water is stirred in the neutralization tank 2 by a stirrer for 5-10 minutes, concentrated sulfuric acid is dripped into the neutralization tank 2 by a metering pump at a liquid level of 1-5 lattices (5.02L/lattice) each time, the dripping position of the concentrated sulfuric acid is 0.2-0.5m outside the radius of a stirring paddle, the neutralization pH value of the reaction is 7.0-8.0, then the neutralized water is conveyed to a filter press by a pneumatic pump (2 tables), the filter-pressed water is conveyed to a clean water tank 5 after flowing into an oil separation tank 4, and the aluminum hydroxide powder obtained by the filter pressing is further processed.
1) The liquid level of concentrated sulfuric acid is controlled by a metering pump from a metering tank to be added dropwise at 5 grids each time, the adding position of the concentrated sulfuric acid is 0.2-0.5m outside the radius of a stirring paddle, then the adding is started after waiting for 5 minutes, at the moment, white granular precipitate is separated out from water in a neutralization tank 2, the white granular precipitate slowly disappears in the process of waiting for 5 minutes with stirring, and the pH value change is measured to be reduced from 12.5 to 12.3.
2) Continuously dripping 5 grids of liquid level concentrated sulfuric acid, stirring and waiting for 5-10 minutes, wherein the PH value is reduced to 12, and the white granular precipitate in the neutralization tank is not completely disappeared.
3) Continuously dripping 5 grids of liquid level concentrated sulfuric acid, stirring and waiting for 5-10 minutes, wherein the PH value is reduced to 11.5, and white granular precipitation in a neutralization tank is increased.
4) Continuously dripping 5 grids of liquid level concentrated sulfuric acid, stirring and waiting for 5-10 minutes, wherein the PH value is reduced to 10.5, and white granular precipitation in a neutralization tank is continuously increased.
5) Continuously dripping concentrated sulfuric acid with 3 grids of liquid level, stirring and waiting for 5-10 minutes, wherein the PH value is reduced to 9.5, and white granular precipitation in the neutralization tank is continuously increased.
6) Continuously dripping 2 grids of liquid level concentrated sulfuric acid, stirring and waiting for 5-10 minutes, wherein the PH value is reduced to 8.7, and white granular precipitation in a neutralization tank is continuously increased.
7) Continuously dripping 1 lattice liquid level concentrated sulfuric acid, stirring and waiting for 5-10 minutes, wherein the PH value is reduced to 8.2, and white granular precipitation in the neutralization tank is continuously increased.
8) Continuously dripping a trace amount of concentrated sulfuric acid, slowly adjusting the pH value to about 7.5, and enabling the wastewater to be milky suspension.
(3) And 2 pneumatic pumps are used for conveying the milky white suspension of the neutralization tank 2 into a filter press 3 for filter pressing, the filtrate enters a downstream oil separation tank 4 for further treatment, and clear water is reserved in a clear water tank 5. White aluminum hydroxide is further processed into finished products for industrial use.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these do not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (6)
1. A method for treating carbon five resin wastewater, which is characterized by comprising the following steps:
(1) Discharging the wastewater produced by the carbon five resin device, namely high-salt alkaline water, to an oil separation tank for oil separation, separating grease and impurities in the wastewater, and flowing to a neutralization tank;
(2) Adding concentrated sulfuric acid dropwise into high-salt alkaline water in a neutralization tank while stirring, and neutralizing wastewater in the tank until the pH value is 7.5-8.0 to obtain high-salt water and aluminum hydroxide precipitate;
(3) Filtering the high-salt water obtained in the step (2) to obtain filtrate and aluminum hydroxide powder;
(4) Sending the filtrate obtained in the step (3) to a downstream oil separation tank for treatment, and then discharging the filtrate to a clean water tank;
in the step (2), concentrated sulfuric acid is dropwise added in batches, and the pH value of the wastewater is gradually adjusted; in the step (2), the pH value of the wastewater is dropped to 12 in the first time, the pH value of the wastewater is dropped to 11.5 in the second time, the pH value of the wastewater is dropped to 10.5 in the third time, the pH value of the wastewater is dropped to 9.5 in the fourth time, the pH value of the wastewater is dropped to 8.7 in the fifth time, the pH value of the wastewater is dropped to 8.2 in the sixth time, and the pH value of the wastewater is dropped to 7.5-8.0 in the last time.
2. The method for treating carbon five resin wastewater according to claim 1, wherein in the step (2), concentrated sulfuric acid is placed in a metering tank, and the concentrated sulfuric acid is pumped by a metering pump for dropwise addition.
3. The method for treating carbon five resin wastewater according to claim 1 or 2, wherein in the step (2), a stirrer is arranged in the neutralization tank, and the motor used in the method is an explosion-proof variable frequency motor; the dropping position of the concentrated sulfuric acid is 0.2-0.5m outside the radius of the stirring paddle.
4. A method for treating carbon five resin wastewater according to claim 3, wherein in said step (2), after each dropping of concentrated sulfuric acid, the pH is measured after stirring for 5 to 10 minutes.
5. The method for treating carbon five resin wastewater according to claim 1 or 2, wherein in the step (1), the oil separation tank has a multi-layer water seal type oil separation chamber.
6. The method for treating carbon five resin wastewater according to claim 1 or 2, wherein in the step (1), the positions of the oil separation tank and the neutralization tank are provided with a drop, namely the height of the neutralization tank is lower than that of the oil separation tank, and high saline-alkali water automatically flows into the neutralization tank by gravity.
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| CN109368677A (en) * | 2018-12-17 | 2019-02-22 | 北京建工金源环保发展股份有限公司 | A method of recycling aluminum sulfate from waste acid liquor |
| CN109455748A (en) * | 2018-12-17 | 2019-03-12 | 北京建工金源环保发展股份有限公司 | A method of recycling aluminum nitrate from waste acid liquor |
| CN112960820A (en) * | 2021-03-08 | 2021-06-15 | 沈阳大学 | Method for treating C5 resin wastewater containing metaaluminate |
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2021
- 2021-12-23 CN CN202111589195.4A patent/CN114314912B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2087426C1 (en) * | 1993-02-01 | 1997-08-20 | Волгоградская государственная архитектурно-строительная академия | Method of treatment of oily-emulsion sewage |
| JP2004203674A (en) * | 2002-12-25 | 2004-07-22 | Showa Denko Kk | Method for purifying sodium aluminate solution, and method for manufacturing aluminum hydroxide |
| CN108622921A (en) * | 2018-08-16 | 2018-10-09 | 青岛科技大学 | A kind of high temperature resistant low-sodium aluminum hydroxide novel preparation method |
| CN109368677A (en) * | 2018-12-17 | 2019-02-22 | 北京建工金源环保发展股份有限公司 | A method of recycling aluminum sulfate from waste acid liquor |
| CN109455748A (en) * | 2018-12-17 | 2019-03-12 | 北京建工金源环保发展股份有限公司 | A method of recycling aluminum nitrate from waste acid liquor |
| CN112960820A (en) * | 2021-03-08 | 2021-06-15 | 沈阳大学 | Method for treating C5 resin wastewater containing metaaluminate |
Non-Patent Citations (1)
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