CN113003635B - High-salinity organic wastewater concentration and reduction treatment method and device - Google Patents
High-salinity organic wastewater concentration and reduction treatment method and device Download PDFInfo
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- CN113003635B CN113003635B CN202110133822.7A CN202110133822A CN113003635B CN 113003635 B CN113003635 B CN 113003635B CN 202110133822 A CN202110133822 A CN 202110133822A CN 113003635 B CN113003635 B CN 113003635B
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
- B01D1/222—In rotating vessels; vessels with movable parts
- B01D1/223—In rotating vessels; vessels with movable parts containing a rotor
- B01D1/225—In rotating vessels; vessels with movable parts containing a rotor with blades or scrapers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a method and a device for concentrating and reducing high-salt organic wastewater, which firstly use a gas stripping and rectifying method to recover part of organic solvent from the high-salt organic wastewater; then an evaporation concentration device is used for evaporation concentration; the evaporation concentration device is a multi-stage scraper evaporation device, an inner-layer evaporation wall surface and an outer-layer evaporation wall surface are arranged in the scraper evaporation device, and an inner-layer movable scraper and an outer-layer movable scraper are used for uniformly scraping films. The invention can be used for concentrating and reducing high-salinity organic wastewater with high efficiency and low cost, and is more energy-saving and environment-friendly.
Description
Technical Field
The invention relates to a concentration and decrement treatment method and a device for high-salinity organic wastewater, belonging to the technical field of wastewater treatment.
Background
The synthesis process of the chemical bulk drug generally comprises the working procedures of reaction, separation, crystallization, filtration, washing, drying and the like, wherein the working procedures of crystallization, filtration, washing and tail gas purification can generate high-concentration organic wastewater with high salt content, the salt content can reach 30 percent and is almost close to saturation. Meanwhile, a large amount of organic substances, COD, exist in the wastewaterCrIs extremely high. In addition, the soluble inorganic salts in the waste liquid are mainly present in the form of sodium chloride, sodium sulfate, magnesium sulfate, and the like.
The Chinese patent application CN201710977046.2 discloses a method for concentrating and reducing high-salt wastewater by combining stripping rectification with scraper distillation. Although this physical method can effectively concentrate high-salinity wastewater, the existing scraper evaporator has the problem of relatively low working efficiency.
Disclosure of Invention
The invention aims to provide a method and a device for concentrating and reducing high-salinity organic wastewater. The invention can be used for concentrating and reducing high-salinity organic wastewater with high efficiency and low cost, and is more energy-saving and environment-friendly.
The technical scheme of the invention is as follows: a method for concentrating and reducing high-salt organic wastewater is characterized by comprising the following steps: firstly, recovering part of organic solvent from high-salt organic wastewater by using a gas stripping rectification method; then an evaporation concentration device is used for evaporation concentration; the evaporation concentration device is a multi-stage scraper evaporation device, an inner-layer evaporation wall surface and an outer-layer evaporation wall surface are arranged in the scraper evaporation device, and an inner-layer movable scraper and an outer-layer movable scraper are used for uniformly scraping films.
An evaporation concentration device for realizing the method comprises the following steps: the device comprises a plurality of stages of evaporation cylinders distributed from top to bottom, wherein a gas collecting cylinder is arranged above the evaporation cylinder at the uppermost stage, and a discharging cylinder is arranged below the evaporation cylinder at the lowermost stage; the evaporation cylinder comprises an outer-layer jacket and an inner-layer jacket, a bidirectional movable scraper mechanism is arranged between the outer-layer jacket and the inner-layer jacket, and the bidirectional movable scraper mechanism is connected with a rotating motor arranged above the gas collecting cylinder; and a liquid distribution mechanism for distributing the wastewater to the outer walls of the outer-layer jacket and the inner-layer jacket is arranged between the evaporation cylinder and the gas collecting cylinder at the uppermost stage. The structure can ensure that the area of the evaporation wall surface of the evaporation cylinder is replied and amplified, and is beneficial to improving the evaporation efficiency.
In the evaporation concentration device, the bidirectional movable scraper mechanism comprises a plurality of support frames uniformly distributed in the evaporation cylinder, two sides of each support frame are respectively provided with a movable groove along the radial direction of the evaporation cylinder, a scraper base is arranged in each movable groove, and a movable scraper is arranged on each scraper base; the top and the bottom of the support frame are respectively provided with a central connecting rod, and two ends of the central connecting rod are respectively hinged with the two scraper blade bases on the inner side and the outer side through hinged linkage rods; the center of the central connecting rod is hinged on the supporting frame; wherein the weight of the squeegee base located on the outer side is greater than that of the squeegee base located on the inner side. The structure utilizes the centrifugal force difference of two scraper blade bases during rotation, and utilizes the linkage of a central connecting rod, so that the scraper blades on the inner side and the outer side can utilize the centrifugal force difference to respectively generate outward force and inward force, the scraper blades can apply pressure to the outer layer jacket and the inner layer jacket, and the evaporation wall surface can be better scraped.
In the evaporation concentration device, the support frames are connected together through the annular reinforcing plate and then connected with the rotating shaft of the rotating motor.
In the evaporation concentration apparatus, the movable scraper is a fluoroplastic scraper.
In the evaporation concentration device, the weight of the scraper base located at the outer side in the evaporation cylinder of the next stage is greater than the weight of the scraper base located at the outer side in the evaporation cylinder of the previous stage. This setting can make the scraping force of the movable scraper blade of next level be greater than the last level, is favorable to the concentrated waste water that the subordinate concentration is higher (viscosity is bigger) to scribble more evenly on the evaporation wall.
In the evaporation and concentration device, the movable scraper is obliquely arranged, so that the effect of a spiral scraper can be formed during rotation.
In the evaporation concentration device, the lower end of the inner side of the gas collecting cylinder is provided with the rotating blade, and the rotating blade is fixed on the rotating shaft of the rotating motor, so that an upper suction force can be provided, the air pressure in the evaporation cylinder is reduced, and the evaporation is accelerated.
In the evaporation concentration device, the upper ends of the outer layer jacket and the inner layer jacket are both provided with steam inlets, and the lower ends of the outer layer jacket and the inner layer jacket are both provided with steam outlets.
In the evaporation concentration device, the gas collecting cylinder is connected with a condenser.
In the evaporation concentration device, the liquid distribution mechanism is an annular plate with a middle bulge and two ends respectively pointing to the outer jacket and the inner jacket, and the inner edge and the outer edge of the annular plate are uniformly distributed with flow distribution holes.
Compared with the prior art, the method can be used for efficiently and inexpensively concentrating and reducing the high-salinity organic wastewater, and is more energy-saving and environment-friendly.
The double-layer jacket is arranged in the evaporation cylinder to increase the area of the evaporation wall surface, and the bidirectional movable scraper mechanism capable of realizing bidirectional force application by using centrifugal force difference is further structured, so that double-layer wall scraping actions can be realized simultaneously by using the power of one motor, and the inner wall scraping action and the outer wall scraping action are both in a movable pressure applying mode, so that the double-layer movable scraper mechanism can more closely and uniformly coat waste water and waste water on the evaporation wall surface compared with a fixed scraper. The precision of the clamp sleeve and the scraper is high by the mode of fixing the scraper, the viscosity and the adhesive force of waste water with different concentrations are different, the attachable thickness of the waste water on the evaporation wall surface is different, and the fixed scraper means a fixed gap, so that the limitation that the scraper cannot scrape or scrapes too thin is easily caused. In either case, this will lead to a decrease in the evaporation efficiency.
In addition, the invention utilizes the weight difference between the inner and outer scraper bases to generate different centrifugal forces when the scraper bases rotate, and the two scraper bases are connected by the link mechanism, so that the outer movable scraper can press outwards, and the inner movable scraper can press inwards, thereby realizing bidirectional pressing. The structure has the advantages of ingenious design, simple structure, difficult damage and convenient maintenance. In addition, the invention also considers that the waste water is continuously evaporated in the downward advancing process in the evaporation cylinder, the concentration is gradually increased, and the adhesive force is continuously enhanced, so that a multi-stage evaporation cylinder is designed, the pressure of the movable scraper is still adjusted by adjusting the weight of the scraper base, the pressure of the downward movable scraper is higher, the whole evaporation device can achieve the best efficiency, and the phenomenon of wall hanging and scaling is not easy to occur.
Drawings
FIG. 1 is a schematic diagram of a top view of the apparatus of the present invention;
FIG. 2 is a schematic cross-sectional view of an evaporation cylinder of the apparatus of the present invention;
fig. 3 is a schematic structural view of a bidirectional movable scraper mechanism of the device.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Examples are given. A high-salinity organic wastewater concentration and reduction treatment method comprises the following steps: firstly, recovering part of organic solvent from high-salt organic wastewater by using a gas stripping rectification method; then an evaporation concentration device is used for evaporation concentration; the evaporation concentration device is a multi-stage scraper evaporation device, an inner-layer evaporation wall surface and an outer-layer evaporation wall surface are arranged in the scraper evaporation device, and an inner-layer movable scraper and an outer-layer movable scraper are used for uniformly scraping films. The evaporation concentration device is shown in figures 1 and 2: the device comprises a plurality of stages of evaporation cylinders 1 distributed from top to bottom, wherein a gas collecting cylinder 2 is arranged above the evaporation cylinder 1 at the uppermost stage, and a discharging cylinder 3 is arranged below the evaporation cylinder 1 at the lowermost stage; the evaporation cylinder 1 comprises an outer-layer jacket 101 and an inner-layer jacket 102, a bidirectional movable scraper mechanism 4 is arranged between the outer-layer jacket 101 and the inner-layer jacket 102, and the bidirectional movable scraper mechanism 4 is connected with a rotating motor 5 arranged above the gas collecting cylinder 2; a liquid distribution mechanism 6 for distributing the waste water to the outer walls of the outer layer jacket 101 and the inner layer jacket 102 is arranged between the evaporation cylinder 1 and the gas collecting cylinder 2 at the uppermost stage. As shown in fig. 3, the bidirectional movable scraper mechanism 4 includes a plurality of support frames 401 uniformly distributed in the evaporation cylinder 1, two sides of each support frame 401 are respectively provided with a movable groove along the radial direction of the evaporation cylinder 1, a scraper base 402 is arranged in each movable groove, and a movable scraper 403 is mounted on the scraper base 402; the top and the bottom of the support frame 401 are both provided with a central connecting rod 404, and two ends of the central connecting rod 404 are respectively hinged with the two scraper blade bases 402 at the inner side and the outer side through hinged linkage rods 405; the center of the central connecting rod 404 is hinged on the supporting frame 401; wherein the squeegee base 402 on the outside weighs more than the squeegee base 402 on the inside. The supporting frames 401 are connected together through an annular reinforcing plate and then connected with a rotating shaft 501 of the rotating motor 5. The movable scraper 403 is a fluoroplastic scraper. The weight of the scraper base 402 located outside the next-stage evaporation cylinder 1 is greater than the weight of the scraper base 402 located outside the previous-stage evaporation cylinder 1. The movable squeegee 403 is disposed obliquely. The lower end of the inner side of the gas collecting cylinder 2 is provided with a rotating blade 201, and the rotating blade 201 is fixed on a rotating shaft 501 of the rotating motor 5. The upper ends of the outer layer jacket 101 and the inner layer jacket 102 are both provided with a steam inlet 103, and the lower ends are both provided with a steam outlet 104. And the gas collecting cylinder 2 is connected with a condenser 7. The liquid distribution mechanism 6 is an annular plate with a middle bulge and two ends respectively pointing to the outer-layer jacket 101 and the inner-layer jacket 102, and the inner edge and the outer edge of the annular plate are uniformly distributed with flow distribution holes.
Examples of the experiments. 500L of high-salinity wastewater collected in a workshop is taken and placed in a wastewater tank, the total salt concentration is about 10-14 ten thousand mg/L through sampling detection, the water inflow is controlled by a water inlet pump to be about 100L/h and then pumped into the feed inlet of the high-salinity wastewater treatment device, a motor is started, a movable scraper is rotated, and the rotating speed of the scraper is kept at 300 revolutions per minute. Meanwhile, the barrel of the evaporation barrel is heated by evaporation under 0.4MPa, the heating temperature is about 120 ℃, the normal pressure is kept in the barrel, and after the materials are heated and evaporated in the barrel, the steam is cooled and recovered by a condenser; concentrated brine is concentrated to the discharge gate end, and the concentrate circulation returns the discharge gate end, and part is discharged to the concentrate collecting box. The total salt, CODcr, TN in and out of the water and the total salt concentration in the concentrated solution are measured periodically in the experimental stage.
Continuously running for more than two weeks, taking one week for continuous wastewater sampling detection, and showing the detection indexes and the removal effect in the following table.
The result shows that the total salt removal rate of the novel evaporation desalination device during normal operation is 93.7-95.6%. Therefore, the desalting capacity of the novel evaporation desalting device is remarkable, and almost all low-boiling organic matters after desalting are evaporated and condensed into low-salt high-concentration wastewater. The high-boiling organic matter is difficult to evaporate, the CODCr removal rate of the equipment effluent depends on the concentration of the high-boiling organic matter in the wastewater, and the effluent treated by the novel desalting device can be further pretreated by high-efficiency desolventizing.
The device of the invention has the following advantages:
the operation under low pressure condition is realized, the boiling point of the treated material is reduced, and the evaporation intensity is high.
Secondly, the overflowing time of the materials in the evaporator is short, no coking and no scaling are generated, and the decomposition, polymerization or deterioration of the products in the evaporation process is effectively prevented.
Strong adaptability, convenient operation and convenient maintenance.
Claims (8)
1. A high-salinity organic wastewater concentration and reduction treatment method is characterized in that: firstly, recovering part of organic solvent from high-salt organic wastewater by using a gas stripping rectification method; then, evaporating and concentrating by using an evaporation and concentration device; the evaporation concentration device is a multi-stage scraper evaporation device, an inner-layer evaporation wall surface and an outer-layer evaporation wall surface are arranged in the scraper evaporation device, and an inner-layer movable scraper and an outer-layer movable scraper are used for uniformly scraping films; the evaporation concentration device comprises a plurality of stages of evaporation cylinders (1) distributed from top to bottom, a gas collecting cylinder (2) is arranged above the uppermost stage of evaporation cylinder (1), and a discharge cylinder (3) is arranged below the lowermost stage of evaporation cylinder (1); the evaporation cylinder (1) comprises an outer layer jacket (101) and an inner layer jacket (102), a bidirectional movable scraper mechanism (4) is arranged between the outer layer jacket (101) and the inner layer jacket (102), and the bidirectional movable scraper mechanism (4) is connected with a rotating motor (5) arranged above the gas collecting cylinder (2); a liquid distribution mechanism (6) for distributing the waste water to the outer walls of the outer layer jacket (101) and the inner layer jacket (102) is arranged between the uppermost stage of evaporation cylinder (1) and the gas collecting cylinder (2); the bidirectional movable scraper mechanism (4) comprises a plurality of support frames (401) which are uniformly distributed in the evaporation cylinder (1), two sides of each support frame (401) are respectively provided with a movable groove along the radial direction of the evaporation cylinder (1), a scraper base (402) is arranged in each movable groove, and a movable scraper (403) is arranged on each scraper base (402); the top and the bottom of the support frame (401) are both provided with a central connecting rod (404), and two ends of the central connecting rod (404) are respectively hinged with the two scraper blade bases (402) at the inner side and the outer side through hinged linkage rods (405); the center of the central connecting rod (404) is hinged on the supporting frame (401); wherein the weight of the squeegee base (402) on the outer side is greater than the weight of the squeegee base (402) on the inner side.
2. The method for concentration and decrement treatment of high-salinity organic wastewater according to claim 1, characterized in that: the supporting frames (401) are connected together through an annular reinforcing plate and then connected with a rotating shaft (501) of the rotating motor (5).
3. The method for concentration and decrement treatment of high-salinity organic wastewater according to claim 1, characterized in that: the movable scraper (403) is a fluoroplastic scraper.
4. The method for concentration and decrement treatment of high-salinity organic wastewater according to claim 1, characterized in that: the weight of the scraper base (402) positioned at the outer side in the next-stage evaporation cylinder (1) is greater than that of the scraper base (402) positioned at the outer side in the previous-stage evaporation cylinder (1).
5. The method for concentration and decrement treatment of high-salinity organic wastewater according to claim 1, characterized in that: the movable scraper (403) is obliquely arranged.
6. The method for concentration and decrement treatment of high-salinity organic wastewater according to claim 1, characterized in that: and the lower end of the inner side of the gas collecting cylinder (2) is provided with a rotating blade (201), and the rotating blade (201) is fixed on a rotating shaft (501) of the rotating motor (5).
7. The method for concentration and decrement treatment of high-salinity organic wastewater according to claim 1, characterized in that: the upper ends of the outer layer jacket (101) and the inner layer jacket (102) are both provided with a steam inlet (103), and the lower ends are both provided with a steam outlet (104); and the gas collecting cylinder (2) is connected with a condenser (7).
8. The method for concentration and decrement treatment of high-salinity organic wastewater according to claim 1, characterized in that: the liquid distribution mechanism (6) is an annular plate with a middle bulge and two ends respectively pointing to the outer layer jacket (101) and the inner layer jacket (102), and the inner edge and the outer edge of the annular plate are uniformly distributed with flow distribution holes.
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| CN202110133822.7A CN113003635B (en) | 2021-02-01 | 2021-02-01 | High-salinity organic wastewater concentration and reduction treatment method and device |
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| CN202110133822.7A CN113003635B (en) | 2021-02-01 | 2021-02-01 | High-salinity organic wastewater concentration and reduction treatment method and device |
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| CN113003635A CN113003635A (en) | 2021-06-22 |
| CN113003635B true CN113003635B (en) | 2022-06-17 |
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| JP2000279702A (en) * | 1999-01-28 | 2000-10-10 | Shinko Pantec Co Ltd | Method of obtaining byproduct from liquid to be treated and vessel for same |
| CN107746086A (en) * | 2017-10-19 | 2018-03-02 | 浙江东天虹环保工程有限公司 | A kind of organic wastewater with difficult degradation thereby preprocess method of high concentration and high saliferous |
| CN108970158A (en) * | 2018-09-14 | 2018-12-11 | 江苏拓驰工程技术开发有限公司 | A kind of Double-scraper luwa evaporator |
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