CN113845261B - High-salt high-concentration organic wastewater treatment system and method - Google Patents
High-salt high-concentration organic wastewater treatment system and method Download PDFInfo
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- C02F1/02—Treatment of water, waste water, or sewage by heating
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- 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
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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Abstract
The invention discloses a high-salt high-concentration organic wastewater treatment system and a method, wherein the system comprises the following steps: the wet catalytic oxidation treatment unit, the evaporative crystallization unit, the dry pyrolysis unit and the tail gas treatment unit are sequentially connected; the wet catalytic oxidation treatment unit comprises a heat exchange module and a catalytic oxidation module, wherein wastewater enters the catalytic oxidation module after passing through the heat exchange module, and after the wastewater reacts with air in the catalytic oxidation module, waste liquid after catalytic oxidation enters the heat exchange module again to serve as a heat source; the drying pyrolysis unit comprises a rotary cylinder, materials enter from a feeding end, sequentially pass through a drying section, a first-section pyrolysis section, a second-section pyrolysis section and a cooling section, and finally are discharged from a discharging end. The wet catalytic oxidation unit of the invention needs proper heat supply in the starting stage, and the heat required in the operation process depends on the heat generated by the reaction itself to maintain the operation of the whole system.
Description
Technical Field
The invention relates to the technical field of organic wastewater treatment, in particular to a high-salt high-concentration organic wastewater treatment system and a high-salt high-concentration organic wastewater treatment method.
Background
The high-salt high-concentration organic wastewater with the salt content of more than 10 percent and the COD of more than 20000mg/L belongs to the high-salt high-concentration organic wastewater with the ultrahigh concentration and relatively high treatment difficulty; the ultrahigh-concentration salt-containing organic wastewater has complex components, high toxicity and difficult treatment, and can cause serious environmental pollution if not treated.
At present, the treatment methods of the high-salt organic wastewater mainly comprise physicochemical and biological treatment methods such as an incineration method, an oxidation method, an ion exchange method, an electrochemical method, a membrane separation method, a biological method and the like. The methods have certain feasibility and application in the aspect of high-salt organic wastewater treatment in certain fields, but the ideal target cannot be achieved when aiming at the ultrahigh-concentration salt organic wastewater.
In wastewater with a salt content of more than 10%, the high salt content generally inhibits the activity of organisms, and the biological method is limited in treating the ultra-high concentration salt-containing organic wastewater. The incineration method has the problems of high energy consumption and tail gas pollution, the COD concentration of the fed material needs to reach 300g/L to maintain stable combustion of the waste liquid, the waste water with the concentration lower than the COD concentration needs to be incinerated with additional supplementary fuel, and the incineration method can generate extremely toxic substances such as dioxin, furan and the like to be discharged along with the flue gas. The ion exchange method and the membrane separation method have good effect on the treatment of high-salt wastewater, but the existence of high-concentration organic matters influences the effect of the ion exchange method and the membrane separation method, and has larger influence on the effect of the resin and the membrane. The electrochemical method for treating the high-salt high-organic wastewater has high operation cost and is difficult to achieve the expected purification effect. Therefore, the economical and effective high-salt organic wastewater treatment technology has become a problem to be researched in the environment-friendly field.
Disclosure of Invention
In view of the above, the invention provides a system and a method for treating high-salt high-concentration organic wastewater, which adopts wet catalytic oxidation combined evaporation crystallization and pyrolysis technology to treat ultrahigh-concentration salt-containing organic wastewater, can treat the pollution problem of organic matters with lower energy consumption and the problem of residual organic matters in crystallized salt, realize organic matter degradation, reach the industrial salt secondary standard after the waste salt treatment, and can completely collect tail gas into a tail gas treatment system.
In order to achieve the above object, in some embodiments, the present invention adopts the following technical solutions:
a high salt, high concentration organic wastewater treatment system comprising: the wet catalytic oxidation treatment unit, the evaporative crystallization unit, the dry pyrolysis unit and the tail gas treatment unit are sequentially connected;
the wet catalytic oxidation treatment unit comprises a heat exchange module and a catalytic oxidation module, wherein wastewater enters the catalytic oxidation module after passing through the heat exchange module, and after the wastewater reacts with air in the catalytic oxidation module, waste liquid after catalytic oxidation enters the heat exchange module again to serve as a heat source;
the drying pyrolysis unit comprises a rotary cylinder, materials enter from a feeding end, sequentially pass through a drying section, a first-section pyrolysis section, a second-section pyrolysis section and a cooling section, and finally are discharged from a discharging end.
As a further scheme, the heat exchange module comprises a first heat exchanger and a second heat exchanger which are connected with each other; after being preheated in the first heat exchanger, the wastewater enters the second heat exchanger to be heated to a set temperature.
As a further scheme, the rotary cylinder can rotate under the drive of the motor, and a set inclination angle exists between the feeding end and the discharging end of the rotary cylinder, so that the material can move from the feeding end to the discharging end.
As a further scheme, the waste heat of the two-section pyrolysis section enters the one-section pyrolysis section, and the waste heat of the one-section pyrolysis section enters the drying section.
As a further proposal, the drying pyrolysis unit adopts an indirect heat exchange mode, and the heat source is not contacted with the materials.
As a further proposal, the gas in the rotary cylinder enters the rotary cylinder from the discharging cover and is led out from the air outlet arranged at the position of the feeding hole.
As a further proposal, the cooling section comprises a spray pipe arranged at the upper part of the rotary cylinder and a cooling water tank arranged at the lower part of the rotary cylinder; the rotating cylinder is immersed in the cooling water tank.
As a further scheme, the tail gas treatment unit receives noncondensable gas generated by the evaporative crystallization unit and waste gas generated by the dry pyrolysis unit.
In other embodiments, the present invention adopts the following technical solutions:
a method for treating high-salt high-concentration organic wastewater comprises the following steps:
after the high-salt high-concentration organic wastewater is heated to a set temperature, carrying out wet catalytic oxidation reaction with air, and returning the reacted wastewater to serve as a heat source for heating the high-salt high-concentration organic wastewater;
evaporating and crystallizing the waste liquid after the reaction, continuously circularly evaporating the liquid after solid-liquid separation, and sequentially drying, carrying out primary pyrolysis, secondary pyrolysis and cooling the separated wet salt to realize dry pyrolysis;
and (3) performing tail gas treatment on non-condensable gas generated in the evaporation and crystallization process and waste gas generated in the drying and pyrolysis process.
As a further proposal, the temperatures required by the drying process, the primary pyrolysis process and the secondary pyrolysis process are increased in sequence; the waste heat of the two-section pyrolysis section enters the one-section pyrolysis section, and the waste heat of the one-section pyrolysis section enters the drying section.
The invention has the beneficial effects that:
1. the wet catalytic oxidation unit of the invention needs proper heat supply in the starting stage, and the heat required in the operation process depends on the heat generated by the reaction itself to maintain the operation of the whole system.
2. The drying and pyrolysis unit is a drying, pyrolysis and cooling integrated rotary cylinder device, so that the drying, primary pyrolysis, secondary pyrolysis and cooling are integrated, and the integration level of the device and the process is improved;
in the drying pyrolysis process, the waste heat of the energy flow from the high-temperature to low-temperature two-stage pyrolysis enters the first-stage pyrolysis, and the waste heat of the first-stage pyrolysis enters the drying stage, so that the cascade utilization of heat is realized, and the system energy is utilized to the greatest extent. The drying pyrolysis section adopts an indirect heat exchange method, the heat source is not in direct contact with the materials, the influence on the materials is small, the heat source is not mixed with pyrolysis tail gas, the amount of generated waste gas and tail gas is small, and the subsequent tail gas treatment is facilitated.
3. The invention realizes the recycling of the waste liquid, the salt in the waste liquid still contains partial organic matters after crystallization and separation, belongs to hazardous waste, and after drying and high-temperature pyrolysis, the salt in the waste liquid reaches the secondary standard of industrial salt, the waste is changed into resources, the pyrolysis time is longer, the quality of the produced industrial salt is stable, the pyrolysis is more thorough, and the tail gas is easy to treat.
4. The invention realizes systematic treatment of high-salt high-organic wastewater, all waste liquid, waste gas and solid waste generated in the process flow are treated, the catalytic oxidation unit belongs to a closed flow, all waste liquid enters the next working section for evaporative crystallization, the evaporative crystallization section realizes solid, liquid and gas separation, the solid belongs to dangerous waste, the solid enters the next working section for dry pyrolysis, the condensate belongs to the biochemical waste liquid without salt, and the biochemical waste liquid can directly enter a biochemical treatment system, and the non-condensable gas is mainly volatile organic waste gas and directly enters a tail gas treatment system.
Drawings
FIG. 1 is a schematic diagram of a high-salt high-concentration organic wastewater treatment system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a rotary cylinder according to an embodiment of the present invention;
1, a first heat exchanger; 2. a second heat exchanger; 3. a wet catalytic oxidation reactor; 4. a preheater; 5. a heating chamber; 6. an evaporation chamber; 7. a vapor compressor; 8. a vapor-liquid separator; 9. a centrifuge; 10. drying, pyrolyzing and cooling the integrated rotary cylinder; 11. a drying section; 12. a first pyrolysis section; 13. a two-stage pyrolysis stage; 14. a cooling section; 15. a feed inlet; 16. a discharge port; 17. an induced draft fan; 18. a housing; 19. a heat preservation layer; 20. a furnace; 21. a heating rod; 22. a cylinder body.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
In one or more embodiments, a high salt, high concentration organic wastewater treatment system is disclosed, comprising: the device comprises a wet catalytic oxidation treatment unit, an evaporation crystallization unit, a dry pyrolysis unit and a tail gas treatment unit which are connected in sequence. The wet catalytic oxidation treatment unit comprises a heat exchange module and a catalytic oxidation module, wherein the wastewater enters the catalytic oxidation module after passing through the heat exchange module, and the wastewater and air react in the catalytic oxidation module and then the waste liquid after catalytic oxidation enters the heat exchange module again to serve as a heat source; the drying pyrolysis unit comprises a rotary cylinder, materials enter from a feeding end, sequentially pass through a drying section 11, a first pyrolysis section 12, a second pyrolysis section 13 and a cooling section 14, and finally are discharged from a discharging end.
Specifically, with reference to fig. 1, the heat exchange module comprises a first heat exchanger 1 and a second heat exchanger 2 connected to each other; after the wastewater is preheated in the first heat exchanger 1, the wastewater enters the second heat exchanger 2 to be heated to a set temperature; the catalytic oxidation module comprises a wet catalytic oxidation reactor 3; after the high-salt organic wastewater is preheated by the first heat exchanger 1, the high-salt organic wastewater enters the second heat exchanger 2 and is heated to the set temperature of 240 ℃, enters the bottom of the wet catalytic oxidation reactor 3, compressed air is also introduced from the bottom of the wet catalytic oxidation reactor 3, and when the mixture of the wastewater and the air is reacted under the action of a catalyst, most of organic matters are treated by catalytic oxidation and then discharged from the top of the wet catalytic oxidation reactor 3. The biodegradability of organic matters in the waste liquid after catalytic oxidation is improved, BOD5/COD of the effluent is more than 0.3, and the effluent of the waste water after oxidation is used as a heat source of the first heat exchanger 1 to heat the high-salt high-concentration organic waste water.
In this example, the residence time of wastewater in the reactor was determined according to the type, concentration and degradation rate of wastewater. The residence time of the wastewater can also be judged according to the outlet water temperature of the wastewater, the catalytic oxidation reaction is exothermic, the reaction temperature in the reactor is axially changed, the residence time of the wastewater is controlled according to the preset outlet water temperature, when the temperature is lower than the preset temperature, the residence time of the wastewater in the reaction tank is prolonged, and when the temperature is higher than the preset temperature, the residence time of the wastewater in the reaction tank is shortened.
The high-salt wastewater has stronger corrosion to equipment at high temperature, the heat exchanger, the reactor and the pipe need to be made of salt corrosion resistant materials, and through selecting various materials for test, the Ti material and the Zr material meet the corrosion degree of less than or equal to 0.05 mm/year, and are suitable to be used as equipment materials of a wet catalytic oxidation unit, and the specific test numbers are shown in the table below. The reaction tower is a conventional packed tower, the catalyst and the packing support are grid flower plates, the aperture is 20mm, two layers of Ti or Zr wire screens are respectively paved under the mountain as packing interlayer, and titanium sponge packing, catalyst and titanium sponge packing are respectively paved between the wire screens from top to bottom.
In this embodiment, the evaporation crystallization unit adopts MVR, and the liquid is continuously circularly evaporated after solid-liquid separation by MVR evaporation crystallization, and the separated salt enters the next process step. In this embodiment, the high-concentration salt solution is crystallized after being evaporated, the solution becomes a solid-liquid mixture of the mother solution and the crystallized salt, the solid-liquid mixture is separated by adopting the centrifuge 9, the solid part enters the lower working section for drying, pyrolysis and cooling, and the liquid part continues to return to MVR for evaporation and crystallization.
The evaporation crystallization section of the embodiment realizes solid, liquid and gas separation, the solid belongs to hazardous waste, the solid enters the next working section for drying and pyrolysis, the discharged condensate belongs to salt-free biochemical waste liquid, the salt-free biochemical waste liquid can directly enter a biochemical treatment system, and the non-condensable gas generated by the vapor-liquid separator 8 is mainly volatile organic waste gas and directly enters a tail gas treatment unit.
The wet salt generated by the evaporation crystallization unit contains a small amount of organic matters, belongs to hazardous waste and needs further treatment. In the embodiment, the rotary cylinder of the drying pyrolysis unit is a drying, pyrolysis and cooling integrated rotary cylinder 10 device, and the integration level of the device and the process is improved; the equipment is divided into 4 functional sections, namely drying, primary pyrolysis, secondary pyrolysis and cooling, and the motor drives the rotary cylinder to rotate. The rotary cylinder feed end and discharge end have the inclination angle that sets for, wet salt gets into from the feed end, along with the rotation of rotary drum, under the effect of inclination angle, salt gradually moves to the discharge end from the feed end, get into dry section 11 in proper order, first section pyrolysis section 12, second section pyrolysis section 13 and cooling section 14, finally discharge from the discharge end discharge valve, the discharged salt reaches industry salt second grade standard, become the waste material and become the resource, the time of pyrolysis is longer, the quality of the industry salt of production is stable, the pyrolysis is more thorough for tail gas is easy to handle.
The temperature of the drying section 11 is controlled to be 110-150 ℃, the first-stage pyrolysis temperature is 300-400 ℃, the second-stage pyrolysis temperature is 500-600 ℃, and the drying section is heated by a heating rod 21 in an electric heating mode; the waste heat of the two-stage pyrolysis of the energy flow from the high temperature to the low temperature enters the first-stage pyrolysis, and the waste heat of the first-stage pyrolysis enters the drying stage 11, so that the system energy is utilized to the greatest extent. Referring to fig. 2, a hearth 20 with a heat-insulating layer 19 is arranged outside the rotary cylinder, the hearth 20 and the electric heating device are in a static state, and a shell 18 is arranged on the outer layer of the heat-insulating layer 19; the cooling section 14 adopts cooling water to cool the wall surface of the rotary cylinder, the cooling water is directly sprayed on the surface of the cylinder 22 from the upper spray pipe, meanwhile, a cooling water tank is arranged at the lower part of the cylinder 22, the cylinder 22 is partially immersed in the water tank, the cooling water indirectly exchanges heat with materials in the cylinder, heat of the cylinder 22 is taken away, and the temperature of the cylinder 22 is reduced, so that the aim of reducing the temperature of the materials in the cylinder is fulfilled.
The gas in the rotary cylinder enters the rotary cylinder from the discharging cover and is led out from an air outlet arranged at the position of the feeding hole 15. The gas is carrier gas, only plays a role of carrying moisture, does not serve as a heat source, and enters the rotary cylinder to be in direct contact with waste salt. The heat source of the drying pyrolysis section adopts electric heating, is arranged on the outer wall of the rotary cylinder, and the heat preservation hearth 20 is internally used for transmitting heat into the rotary cylinder in an indirect heating mode.
The indirect heat exchange method is adopted in the drying pyrolysis section, the heat source is not in direct contact with the materials, the influence on the materials is small, the heat source is not mixed with pyrolysis tail gas, the amount of generated waste gas and tail gas is small, and the subsequent tail gas treatment is facilitated.
The non-condensable gas generated by the evaporative crystallization unit through the vapor-liquid separator 8 and the waste gas generated by the pyrolysis unit are led out through the induced draft fan 17 and enter the tail gas treatment unit.
The embodiment adopts the processes of catalytic oxidation, evaporative crystallization and dry pyrolysis systems, and solves the problem that high-salt and high-organic wastewater is difficult to treat. The waste water and the waste gas generated after the treatment can be treated by adopting a conventional process, so that the standard emission is realized; the energy in the whole system is utilized in a cascade way, and the system is energy-saving and efficient. The catalytic oxidation unit needs to supply heat properly in the starting stage, and the operation balance is realized by generating heat in the operation process. The energy flow of the drying pyrolysis unit is from the waste heat of the high-temperature to low-temperature two-stage pyrolysis to enter the first-stage pyrolysis, and the waste heat of the first-stage pyrolysis enters the drying stage 11, so that the system energy is utilized to the greatest extent; the process integration level is higher, drying, pyrolysis and cooling are integrally completed, the treatment of organic salt is completed in one step, the salt in the wastewater reaches the industrial salt standard after being treated, and the recycling utilization is realized.
Example two
In one or more embodiments, a method for treating high-salt, high-concentration organic wastewater is disclosed, comprising the steps of:
after the high-salt high-concentration organic wastewater is heated to a set temperature, carrying out wet catalytic oxidation reaction with air, and returning the reacted wastewater to serve as a heat source for heating the high-salt high-concentration organic wastewater;
evaporating and crystallizing the waste liquid after the reaction, continuously circularly evaporating the liquid after solid-liquid separation, and sequentially drying, carrying out primary pyrolysis, secondary pyrolysis and cooling the separated wet salt to realize dry pyrolysis;
the tail gas treatment is carried out by non-condensable gas generated by a vapor-liquid separator 8 in the evaporation crystallization process and waste gas generated in the drying pyrolysis process.
As a specific implementation mode, taking high-salt and high-organic wastewater of a certain chemical plant as an example, the main component of the wastewater is cymoxanil, COD is 50000-60000 mg/L, and salt (sodium chloride) content is 12%. The specific process flow is as follows:
(1) Pretreatment: after pretreatment such as wastewater neutralization and filtration, preparing to enter a catalytic oxidation unit for treatment;
(2) Waste water catalytic oxidation treatment: after being preheated by the first heat exchanger 1, the wastewater enters the second heat exchanger 2, if the temperature reaches 240 ℃, no additional heat supply is needed, and if the temperature does not reach 240 ℃, the additional heat supply is needed, and the wastewater is heated to 240 ℃. The wastewater enters the bottom of the reaction tank and is mixed with the compressed air, and organic matters in the wastewater are reacted under the action of the catalyst and decomposed into micromolecular acid and CO 2 And H 2 And O, carrying out catalytic oxidation to remove most of organic matters, and discharging from the top of the reaction tank. The residence time of the wastewater in the reaction tank is controlled, the discharge temperature of the wastewater is controlled to be 260-270 ℃, and when the temperature is lower than 260 ℃, the residence time of the wastewater in the reaction tank is prolonged, and when the temperature is higher than 270 ℃, the residence time of the wastewater in the reaction tank is shortened. The oxidized wastewater effluent is used as a heat source of the heat exchanger 1, the pretreated wastewater is heated, the temperature is reduced to 50-60 ℃ and then the wastewater is discharged out of the catalytic oxidation unit.
(3) And (3) evaporating and crystallizing: the wastewater after catalytic oxidation and heat exchange enters an evaporation crystallization unit, is preheated by a wastewater preheater 4, enters a heating chamber 5 and an evaporation chamber 6 for evaporation, crystallization is started when the solution reaches supersaturated concentration, liquid continues to circularly evaporate after solid-liquid separation, and separated salt enters the next step. The evaporated gas enters a vapor compressor 7, after being compressed, the secondary steam is changed into high-temperature and high-pressure steam from low-temperature and low-pressure steam, the upgraded steam enters a shell side of a heating chamber 5 to exchange heat with the wastewater, the wastewater is heated, the steam is condensed into water, and the condensed water is preheated by a wastewater preheater 4. Finally, the discharged condensed water contains a small amount of organic matters, and the wastewater can be treated by conventional biochemistry, and noncondensable gas enters a tail gas treatment system.
(4) Drying and pyrolysis: wet salt generated by solid-liquid separation in the step (3) contains a small amount of organic matters, belongs to hazardous waste and needs further treatment. Wet salt is sent into a feeding port 15 of a drying, pyrolysis and cooling integrated rotary cylinder 10 device through a material lifting machine, the water content is reduced to 0.1% at the temperature of 11110-150 ℃ in a drying section, the material enters a first-stage pyrolysis section 12 along with the rotation of the rotary cylinder, the temperature is 300-400 ℃, the time is maintained for 1h, the material enters a second-stage pyrolysis section 13, and the temperature is 500-600 ℃ and the time is maintained for 2h. The first-section pyrolysis section 12 and the second-section pyrolysis section 13 are heated by adopting electric heating pipes, the heating pipes can be controlled in a segmented mode, the heat-preserving hearth 20 is arranged outside the rotary cylinder drying pyrolysis section, the hearth 20 and the electric heating device are in a static state, and the inner rotary cylinder rotates to drive salt to move towards the discharge port 16. The drying and pyrolysis maintaining time is controlled by the rotation speed of the rotary drum driven by the motor. After pyrolysis is completed, the pyrolysis enters the cooling section 14 through the transition section, the cooling section 14 cools the wall surface of the rotary cylinder by adopting cooling water, the cooling water is directly sprayed on the surface of the cylinder 22 through a spray pipe at the upper part, meanwhile, a cooling water tank is arranged at the lower part of the cylinder 22, part of the cylinder 22 is immersed in the water tank, the cooling water and materials in the cylinder indirectly exchange heat, heat of the cylinder 22 is taken away, the temperature of the cylinder 22 is reduced, and therefore the aim of reducing the temperature of the materials in the cylinder is achieved. Finally, discharging from a discharge valve at a discharge end, wherein the temperature of discharged salt is 50-60 ℃, and other indexes reach the industrial salt secondary standard. The gas in the rotary drum enters the rotary drum from the discharging cover, and is led out from the air outlet of the feeding hole 15 by the induced draft fan 17, so that oxygen is provided for pyrolysis on one hand, and pyrolysis gas and moisture in the rotary drum can be taken away on the other hand.
(4) Tail gas: the tail gas comprises noncondensable gas generated by the evaporation crystallization unit through the vapor-liquid separator 8 and waste gas generated by the pyrolysis unit, and is led out through the induced draft fan 17 and enters the tail gas treatment system.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. A high-salt high-concentration organic wastewater treatment system, comprising: the wet catalytic oxidation treatment unit, the evaporative crystallization unit, the dry pyrolysis unit and the tail gas treatment unit are sequentially connected;
the wet catalytic oxidation treatment unit comprises a heat exchange module and a catalytic oxidation module, wherein wastewater enters the catalytic oxidation module after passing through the heat exchange module, and after the wastewater reacts with air in the catalytic oxidation module, waste liquid after catalytic oxidation enters the heat exchange module again to serve as a heat source;
the drying pyrolysis unit comprises a rotary cylinder, materials enter from a feeding end, sequentially pass through a drying section, a first-stage pyrolysis section, a second-stage pyrolysis section and a cooling section, and finally are discharged from a discharging end;
waste heat of the two-section pyrolysis section enters the one-section pyrolysis section, and waste heat of the one-section pyrolysis section enters the drying section;
the gas in the rotary cylinder enters the rotary cylinder from the discharging cover and is led out from an air outlet arranged at the position of the feeding hole.
2. A high salt and high concentration organic wastewater treatment system as claimed in claim 1 wherein said heat exchange module comprises a first heat exchanger and a second heat exchanger connected to each other; after being preheated in the first heat exchanger, the wastewater enters the second heat exchanger to be heated to a set temperature.
3. A high salt and high concentration organic wastewater treatment system according to claim 1 wherein said rotatable cylinder is rotatable by a motor, and wherein said rotatable cylinder has a feed end and a discharge end at a predetermined tilt angle to enable movement of said feed end to said discharge end.
4. The system for treating high-salt and high-concentration organic wastewater according to claim 1, wherein the drying pyrolysis unit adopts an indirect heat exchange mode, and the heat source is not contacted with the materials.
5. A high-salt high-concentration organic wastewater treatment system according to claim 1, wherein said cooling section comprises a shower pipe provided at an upper portion of the rotary cylinder and a cooling water tank provided at a lower portion of the rotary cylinder; the rotating cylinder is immersed in the cooling water tank.
6. The system for treating high-salt and high-concentration organic wastewater according to claim 1, wherein the tail gas treatment unit receives non-condensable gas generated by the evaporative crystallization unit and waste gas generated by the dry pyrolysis unit.
7. A method for treating high-salt high-concentration organic wastewater using the high-salt high-concentration organic wastewater treatment system according to any one of claims 1 to 6, comprising:
after the high-salt high-concentration organic wastewater is heated to a set temperature, carrying out wet catalytic oxidation reaction with air, and returning the reacted wastewater to serve as a heat source for heating the high-salt high-concentration organic wastewater;
evaporating and crystallizing the waste liquid after the reaction, continuously circularly evaporating the liquid after solid-liquid separation, and sequentially drying, carrying out primary pyrolysis, secondary pyrolysis and cooling the separated wet salt to realize dry pyrolysis;
and (3) performing tail gas treatment on non-condensable gas generated in the evaporation and crystallization process and waste gas generated in the drying and pyrolysis process.
8. A method for treating high-salt and high-concentration organic wastewater according to claim 7, wherein the temperatures required for the drying process, the first-stage pyrolysis process and the second-stage pyrolysis process are sequentially increased; the waste heat of the two-section pyrolysis section enters the one-section pyrolysis section, and the waste heat of the one-section pyrolysis section enters the drying section.
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| CN202111067788.4A CN113845261B (en) | 2021-09-13 | 2021-09-13 | High-salt high-concentration organic wastewater treatment system and method |
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