Hazardous waste landfill leachate treatment equipment

Abstract

The hazardous waste landfill leachate treatment equipment comprises a drying chamber, and two preheating chambers are arranged on one side of the drying chamber; ambient air firstly enters the air preheating chamber, is subjected to heat exchange with high-temperature flue gas through the heat exchange pipe in the air preheating chamber to be heated, then is further heated through the air electric heater, and enters the waste liquid preheating chamber together with a to-be-dried stock solution through the to-be-dried stock solution inlet; the waste liquid enters the drying chamber through the waste liquid spray gun to be dried, organic matter in the waste liquid is completely incinerated at high temperature, water is completely evaporated, remaining salt falls into the bottom and is discharged out of the drying chamber through the spiral slag discharger, and the smoke is led out through the induced draft fan, so that energy is saved, and the environment is protected. According to the device, the waste heat of air is fully utilized, organic matters in the waste liquid can be thoroughly removed, moisture can be thoroughly evaporated, the evaporation time is short, the remaining substances are produced in a crystal salt form, and the device has very important significance on hazardous waste reduction and material recovery.

Description

Technical Field

[0001] The utility model relates to the technical field of leachate treatment in hazardous waste landfills, in particular to a leachate treatment device for hazardous waste landfills. Background Art

[0002] The treatment of leachate in hazardous waste landfills has always been a difficult problem in the design, operation and management of hazardous waste landfills. Leachate is the product of the gravitational flow of liquid in hazardous waste landfills, mainly derived from precipitation and the water contained in the hazardous waste itself. The leachate in hazardous waste landfills is a wastewater with high organic matter concentration, high salt content and complex composition. If it is directly discharged into the environment without treatment, it will cause serious environmental pollution. In order to protect the environment, the treatment of leachate in hazardous waste landfills is urgent.

[0003] Traditional biological and physicochemical treatment technologies are very suitable for the treatment and management of high-concentration wastewater. Biological treatment technology can be used as a pretreatment process to reduce or eliminate COD, ammonia nitrogen and heavy metal ions. However, for the leachate in hazardous waste landfills with high salt content, biological treatment is powerless. Physicochemical treatment technology can be used as a "stable treatment process" (i.e., the biological degradation process is very little) to remove difficult-to-degrade organic substances. The process combining physicochemical and biological processes avoids the defects of a single process, has good treatment effect, is economical and effective, and is one of the more widely used methods in the treatment of leachate in hazardous waste landfills.

[0004] However, the existing process combining physicochemical and biological processes has high energy consumption, long water evaporation time and low evaporation efficiency. Summary of the Utility Model

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the utility model is to provide a leachate treatment device for hazardous waste landfills, which effectively solves the problems of high energy consumption, long water evaporation time and low evaporation efficiency in the existing process combining physicochemical and biological processes.

[0006] The technical solution it adopts is that a leachate treatment device for hazardous waste landfills includes a drying chamber. Two preheating chambers are arranged on one side of the drying chamber. An ambient air inlet is arranged on one side of one of the preheating chambers, and an undried stock solution inlet is arranged on one side of the other preheating chamber. An air electric heater cooperating with one of the preheating chambers is arranged on one side of the drying chamber. A waste liquid spray gun cooperating with the other preheating chamber is also arranged on one side of the drying chamber. A plurality of heat exchange elements are arranged in both preheating chambers;

[0007] A smoke exhaust mechanism is arranged on one side of one of the preheating chambers, and the smoke exhaust mechanism is used to discharge the smoke in the drying chamber.

[0008] Preferably, the two preheating chambers are respectively an air preheating chamber and a waste liquid preheating chamber, the drying chamber, the air preheating chamber and the waste liquid preheating chamber are connected in sequence, the ambient air inlet is arranged at the bottom end of the air preheating chamber away from the drying chamber, the air preheating chamber is connected to the air electric heater, the inlet for the raw liquid to be dried is arranged at the bottom end of the waste liquid preheating chamber away from the air preheating chamber, and the waste liquid preheating chamber is connected to the waste liquid spray gun.

[0009] Preferably, the heat exchange element is a heat exchange tube, and a plurality of the heat exchange tubes are respectively arranged inside the air preheating chamber and the waste liquid preheating chamber.

[0010] Preferably, the smoke exhaust mechanism comprises an induced draft fan, which is arranged on a side of the waste liquid preheating chamber close to an inlet of the raw liquid to be dried, and a chimney is arranged on a side of the induced draft fan away from the waste liquid preheating chamber.

[0011] Preferably, a spiral slag discharger is provided at the bottom of the drying chamber and the air preheating chamber.

[0012] Preferably, a smoke treatment mechanism is provided between the induced draft fan and the chimney, and the smoke treatment mechanism filters the smoke generated by the combustion in the drying chamber.

[0013] Preferably, the smoke treatment mechanism comprises a filter box, two sides of which are respectively connected to the induced draft fan and the chimney, and a plurality of activated carbon filters are arranged inside the filter box.

[0014] Preferably, the plurality of activated carbon filters can be detachably arranged inside the filter box.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] In the utility model, the ambient air first enters the air preheating chamber, exchanges heat with the high-temperature flue gas through the heat exchange tubes in the air preheating chamber to increase the temperature, and then passes through the air electric heater to further increase the temperature. Similarly, the raw liquid to be dried enters the waste liquid preheating chamber through the raw liquid inlet to be dried, exchanges heat with the high-temperature flue gas through the heat exchange tubes in the waste liquid preheating chamber to increase the temperature, and then enters the drying chamber through the waste liquid spray gun for drying. Under high temperature, the organic matter in the waste liquid is completely burned, the water is completely evaporated, and the remaining salt falls to the bottom and is discharged from the drying chamber by the spiral slag discharger. The induced draft fan draws out the flue gas, saving energy and making full use of the waste heat of the air. Under high temperature conditions, the organic matter in the waste liquid can be completely removed, the water is completely evaporated, the evaporation time is short, and the remaining substances are produced in the form of crystalline salt, which is of great significance to the reduction of hazardous waste and material recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a first-view structural schematic diagram of the hazardous waste landfill leachate treatment equipment of the utility model.

[0018] Explanation of the symbols in the schematic diagram:

[0019] 1. Drying chamber; 2. Ambient air inlet; 3. Inlet for raw liquid to be dried; 4. Electric air heater; 5. Waste liquid spray gun; 6. Induced draft fan; 7. Chimney; 8. Air preheating chamber; 9. Waste liquid preheating chamber; 10. Spiral slag discharger; 11. Heat exchange tube; 12. Filter box; 13. Activated carbon filter. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Depend on Figure 1 A hazardous waste landfill leachate treatment device is disclosed, comprising a drying chamber 1, two preheating chambers, a heat exchanger, an ambient air inlet 2, an inlet for a raw liquid to be dried 3, an air electric heater 4, a waste liquid spray gun 5, and a smoke exhaust mechanism.

[0022] First, the two preheating chambers are respectively an air preheating chamber 8 and a waste liquid preheating chamber 9. The air preheating chamber 8 is arranged on the right side of the drying chamber 1, and the waste liquid preheating chamber 9 is arranged on the side of the air preheating chamber 8 away from the drying chamber 1, and the drying chamber 1, the air preheating chamber 8 and the waste liquid preheating chamber 9 are connected in sequence, and a plurality of heat exchange elements are provided, and the heat exchange elements are heat exchange tubes 11, and the plurality of heat exchange tubes 11 are respectively arranged in the air preheating chamber 8 and the waste liquid preheating chamber 9. More specifically, the drying chamber 1 dries the waste liquid. Under high temperature, the organic matter in the waste liquid is burned out, the water is completely evaporated, and the remaining salt falls into the bottom of the drying chamber 1, and the high-temperature flue gas generated by the combustion in the drying chamber 1 enters the air preheating chamber 8, and the high-temperature flue gas in the air preheating chamber 8 enters the waste liquid preheating chamber 9 again, and the heat of the high-temperature flue gas is absorbed by the heat exchange tubes 11 to cool the high-temperature flue gas.

[0023] Then, the ambient air inlet 2 is arranged at the bottom end of the air preheating chamber 8 on the side away from the drying chamber 1, the air electric heater 4 is arranged on the side of the drying chamber 1 away from the air preheating chamber 8, and the air preheating chamber 8 is connected with the input end of the air electric heater 4. Specifically, the air enters the air preheating chamber 8 through the ambient air inlet 2, and then the heat exchange tube 11 in the air preheating chamber 8 heats the air, and the air after heat exchange and heating enters the air electric heater 4, and the air electric heater 4 heats the air to 1100°C again, and then enters the drying chamber 1.

[0024] The inlet 3 for the raw liquid to be dried is arranged at the bottom end of the waste liquid preheating chamber 9 on the side away from the air preheating chamber 8, and the waste liquid preheating chamber 9 is connected with the waste liquid spray gun 5. Specifically, the waste liquid enters the waste liquid preheating chamber 9 through the inlet 3 for the raw liquid to be dried, and the heat exchange tube 11 in the waste liquid preheating chamber 9 heats the waste liquid and heats it. The waste liquid after heat exchange and heating is sprayed into the drying chamber 1 through the waste liquid spray gun 5, thereby increasing the drying efficiency.

[0025] Secondly, the smoke exhaust mechanism is installed on the right side of the waste liquid preheating chamber 9, and the smoke exhaust mechanism includes an induced draft fan 6 and a chimney 7. Specifically, the induced draft fan 6 is arranged on the side of the waste liquid preheating chamber 9 close to the inlet 3 of the raw liquid to be dried, and the chimney 7 is arranged on the side of the induced draft fan 6 away from the waste liquid preheating chamber 9. More specifically, the induced draft fan 6 draws out the flue gas after heat exchange and cooling in the waste liquid preheating chamber 9 and discharges it through the chimney 7.

[0026] Preferably, a smoke treatment mechanism is provided between the induced draft fan 6 and the chimney 7. Specifically, the smoke treatment mechanism includes a filter box 12 and a plurality of activated carbon filters 13. The filter box 12 is provided at the output end of the induced draft fan 6. The plurality of activated carbon filters 13 are all detachably provided in the filter box 12, so that the activated carbon filters 13 can be quickly disassembled and assembled, thereby replacing the activated carbon filters 13 to improve the filtering efficiency.

[0027] The filter box 12 is arranged at the input end of the chimney 7 on the side away from the induced draft fan 6. Specifically, the induced draft fan 6 draws the flue gas after heat exchange and cooling in the waste liquid preheating chamber 9 into the filter box 12. The flue gas is filtered layer by layer through multiple activated carbon filters 13 to filter and absorb harmful substances in the flue gas. The filtered and absorbed flue gas is then discharged into the atmosphere through the chimney 7 to avoid polluting the environment.

[0028] Finally, a spiral slag discharger 10 is provided at the bottom of the drying chamber 1 and the air preheating chamber 8. The salt waste residue remaining after the waste liquid is completely burned falls into the bottom of the drying chamber 1. When the salt waste residue accumulates to a certain extent, the spiral slag discharger 10 starts to discharge the salt waste residue.

[0029] Beneficial effects obtained from the drying chamber 1, two preheating chambers, heat exchange tubes 11, ambient air inlet 2, stock solution to be dried inlet 3, air electric heater 4, waste liquid spray gun 5, and smoke exhaust mechanism: The ambient air first enters the air preheating chamber 8, exchanges heat and increases in temperature with the high-temperature flue gas through the heat exchange tubes 11 in the air preheating chamber 8, and then further increases in temperature through the air electric heater 4. Similarly, the stock solution to be dried enters the waste liquid preheating chamber 9 through the stock solution to be dried inlet 3, exchanges heat and increases in temperature with the high-temperature flue gas through the heat exchange tubes 11 in the waste liquid preheating chamber 9, and then enters the drying chamber 1 through the waste liquid spray gun 5 for drying. At high temperatures, the organic matter in the waste liquid is completely burned out, the moisture is all evaporated, the remaining salts fall to the bottom and are discharged from the drying chamber 1 by the screw slag discharger 10. The induced draft fan 6 draws out the flue gas, saving energy and making full use of the waste heat of the air. Under high-temperature conditions, the organic matter in the waste liquid can be completely removed, the moisture can be completely evaporated, the evaporation time is short, and the remaining substances are produced in the form of crystal salts, which is of great significance for hazardous waste reduction and material recovery.

[0030] When the utility model is in use, first turn on the air electric heater 4 and the induced draft fan 6. The air enters the air electric heater 4 through the ambient air inlet 2 and the air preheating chamber 8. At this time, there is no high-temperature flue gas in the air preheating chamber 8, and the air electric heater 4 heats the air. The heated air enters the drying chamber 1. The waste liquid enters the waste liquid preheating chamber 9 through the stock solution to be dried inlet 3 and is then sprayed into the drying chamber 1 by the waste liquid spray gun 5. The drying chamber 1 conducts incineration and drying treatment.

[0031] After the drying chamber 1 burns for a period of time, high-temperature flue gas will be generated. At this time, the induced draft fan 6 sucks the high-temperature flue gas in the drying chamber 1. The high-temperature flue gas enters the air preheating chamber 8, exchanges heat with the heat exchange tubes 11 in the air preheating chamber 8, the heat exchange tubes 11 heat up, and the air entering the air preheating chamber 8 will exchange heat with the heat exchange tubes 11 and increase in temperature. The heated air enters the air electric heater 4, and the air electric heater 4 heats the air to 1100 °C again and then enters the drying chamber 1.

[0032] The high-temperature flue gas after heat exchange in the air preheating chamber 8 is discharged backward into the waste liquid preheating chamber 9, and then the high-temperature flue gas exchanges heat with the heat exchange tubes 11 in the waste liquid preheating chamber 9, the heat exchange tubes 11 heat up, and the waste liquid entering the waste liquid preheating chamber 9 will exchange heat with the heat exchange tubes 11 and increase in temperature. The waste liquid after heat exchange and temperature increase is sprayed into the drying chamber 1 through the waste liquid spray gun 5.

[0033] At this time, the high-temperature flue gas after heat exchange and temperature increase in the waste liquid preheating chamber 9 has cooled down. The cooled flue gas is sucked into the filter box 12 by the induced draft fan 6. The flue gas is filtered layer by layer through multiple activated carbon filter meshes 13, and the harmful substances in the flue gas are filtered and absorbed. Then the filtered and absorbed flue gas is discharged into the atmosphere through the chimney 7.

[0034] The salt waste residue remaining after the waste liquid is completely incinerated falls to the bottom of the drying chamber 1. When the salt waste residue accumulates to a certain extent, the screw slag discharger 10 starts to operate to discharge the salt waste residue.

[0035] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hazardous waste landfill leachate treatment equipment, characterized in that: The drying chamber (1) comprises two preheating chambers arranged on one side of the drying chamber (1), one side of the preheating chamber being provided with an ambient air inlet (2), and the other side of the preheating chamber being provided with an inlet (3) for a raw liquid to be dried, an electric air heater (4) cooperating with one of the preheating chambers being provided on one side of the drying chamber (1), a waste liquid spray gun (5) cooperating with the other preheating chamber being provided on one side of the drying chamber (1), and a plurality of heat exchange components being provided in both preheating chambers; A smoke exhaust mechanism is provided on one side of one of the preheating chambers, and the smoke exhaust mechanism is used to exhaust the smoke in the drying chamber (1).

2. The hazardous waste landfill leachate treatment equipment according to claim 1, characterized in that: The two preheating chambers are respectively an air preheating chamber (8) and a waste liquid preheating chamber (9); the drying chamber (1), the air preheating chamber (8) and the waste liquid preheating chamber (9) are connected in sequence; the ambient air inlet (2) is arranged at the bottom end of the air preheating chamber (8) on a side away from the drying chamber (1); the air preheating chamber (8) is connected to the air electric heater (4); the raw liquid inlet (3) to be dried is arranged at the bottom end of the waste liquid preheating chamber (9) on a side away from the air preheating chamber (8); and the waste liquid preheating chamber (9) is connected to the waste liquid spray gun (5).

3. The hazardous waste landfill leachate treatment equipment according to claim 2, characterized in that: The heat exchange element is a heat exchange tube (11), and a plurality of the heat exchange tubes (11) are respectively arranged inside the air preheating chamber (8) and the waste liquid preheating chamber (9).

4. The hazardous waste landfill leachate treatment equipment according to claim 2, characterized in that: The smoke exhaust mechanism comprises an induced draft fan (6), the induced draft fan (6) being arranged on a side of the waste liquid preheating chamber (9) close to an inlet (3) for the raw liquid to be dried, and a chimney (7) being arranged on a side of the induced draft fan (6) facing away from the waste liquid preheating chamber (9).

5. The hazardous waste landfill leachate treatment equipment according to claim 2, characterized in that: A spiral slag discharger (10) is provided at the bottom of the drying chamber (1) and the air preheating chamber (8).

6. The hazardous waste landfill leachate treatment equipment according to claim 4, characterized in that: A smoke treatment mechanism is provided between the induced draft fan (6) and the chimney (7), and the smoke treatment mechanism filters smoke generated by combustion in the drying chamber (1).

7. The hazardous waste landfill leachate treatment equipment according to claim 6, characterized in that: The smoke treatment mechanism comprises a filter box (12), the two sides of the filter box (12) being respectively connected to the induced draft fan (6) and the chimney (7), and a plurality of activated carbon filters (13) are arranged inside the filter box (12).

8. The hazardous waste landfill leachate treatment equipment according to claim 7, characterized in that: The plurality of activated carbon filter screens (13) are all detachably arranged inside the filter box (12).

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