Sewage deamination device

Abstract

The utility model discloses a sewage deamination device, which relates to the technical field of environmental protection, and comprises a hot air system, a bubbling system and an absorption system which are sequentially connected, the hot air system comprises an induced draft fan, a heating furnace and a circulating fan, the circulating fan is communicated with the heating furnace, and the induced draft fan is arranged between the circulating fan and the heating furnace; the heating furnace is used for heating air to blow off high-ammonia sewage, the blow-off efficiency is improved, meanwhile, dilute sulfuric acid is used for absorbing ammonia gas, an ammonium sulfate solution generated by reaction is evaporated and crystallized to form ammonium sulfate, waste is turned into wealth, ammonia in the high-ammonia sewage is converted into an ammonium sulfate product while the high-ammonia sewage is eliminated, and economic benefits are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to a sewage deammoniation device. Background Art

[0002] The ammonia nitrogen content of the production wastewater generated by the existing workshop exceeds the standard. Directly entering the biochemical sewage treatment system will cause the inactivation of microorganisms in the activated sludge, resulting in excessively high ammonia nitrogen indicators in the effluent of the sewage treatment system. Direct discharge will affect the surrounding environment and is not conducive to environmental protection requirements and resource recycling.

[0003] After searching, the patent number is CN212356625U, which discloses a deammonification device, which includes a heater, a stripping tower, an absorption tower, an oxidation tank, a water collecting tank, an ammonia pump, an ammonia absorption pump, a filtrate pump and a fan. The outlet of the filtrate pump is connected to the first feed inlet of the heater, the first discharge port of the heater is connected to the first liquid inlet of the stripping tower, the first liquid discharge port of the stripping tower is connected to the water collecting tank, the outlet of the fan is connected to the first air inlet of the stripping tower, the first exhaust port of the stripping tower is connected to the second air inlet of the absorption tower, and the second exhaust port of the absorption tower is connected to the inlet of the fan; the ammonia absorption pump is connected to the first feed inlet of the heater, the first discharge port of the heater is connected to the first liquid inlet of the stripping tower, the first discharge port of the stripping tower is connected to the water collecting tank, the outlet of the fan is connected to the first air inlet of the stripping tower, the first exhaust port of the stripping tower is connected to the second air inlet of the absorption tower, and the second exhaust port of the absorption tower is connected to the inlet of the fan; The outlet of the collection pump is connected to the second liquid inlet of the absorption tower, the second liquid discharge port of the absorption tower is connected to the inlet of the ammonia pump, the outlet of the ammonia pump is connected to the second feed port of the oxidation tank, and the second discharge port of the oxidation tank is connected to the inlet of the ammonia absorption pump, so as to remove ammonia in the sewage to reduce the load of subsequent processes and reduce the operating cost of sewage treatment. However, the sewage is only heated and blown off with air in the blow-out tower, and the blowing efficiency is not ideal. After the ammonia is absorbed in the absorption tower to form ammonia water, the ammonia in the ammonia water is oxidized into nitrogen and discharged into the air, with low economic benefits. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a sewage deammoniation device in view of the above shortcomings, which overcomes the defects of the existing unsatisfactory stripping efficiency and low economic benefits, and achieves the purpose of good stripping efficiency and high economic benefits.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a sewage deammoniation device, characterized in that it includes a hot air system, a bubbling system and an absorption system connected in sequence, the hot air system includes an induced draft fan, a heating furnace and a circulating fan, the circulating fan is connected to the heating furnace, and the induced draft fan is arranged between the circulating fan and the heating furnace.

[0006] Furthermore, the bubbling system includes a bubbling tower, a first circulation tank and a liquid alkali metering tank. The top of the bubbling tower is provided with a first air outlet, the bottom of the bubbling tower is provided with a first liquid outlet, and the lower part of the bubbling tower is provided with a first air inlet. The bubbling tower includes a first demisting layer, a first spray layer and a first filler from top to bottom.

[0007] Furthermore, the absorption system includes an absorption tower, a second circulation tank and a sulfuric acid metering tank. The top of the absorption tower is provided with a second air outlet, the bottom of the absorption tower is provided with a second liquid outlet, and the lower part of the absorption tower is provided with a second air inlet. The second air inlet is connected to the first air outlet. The absorption tower includes a second demisting layer, a second spray layer and a second filler from top to bottom.

[0008] Furthermore, the outlet of the heating furnace is connected to the first air inlet of the bubbling tower, the air outlet of the circulating fan is connected to the air inlet of the heating furnace, and an induced draft fan is connected between the air outlet of the circulating fan and the air inlet of the heating furnace;

[0009] The first liquid outlet is connected to the first circulation tank, the first circulation tank is connected to the recovery tank, the outlet at the bottom of the first circulation tank is connected to the first spray layer, the first circulation tank is connected to the high ammonia sewage tank, and the outlet of the liquid alkali metering tank and the outlet of the high ammonia sewage tank are respectively connected to the first circulation tank.

[0010] Furthermore, the second liquid outlet is connected to the second circulation tank, the second circulation tank is connected to a density meter and a triple-effect evaporator, the outlet at the bottom of the second circulation tank is connected to the second spray layer, and the outlet of the sulfuric acid metering tank is connected to the second circulation tank.

[0011] Furthermore, the second air outlet of the absorption tower is connected to the air inlet of the circulation fan.

[0012] Furthermore, the high-ammonia wastewater tank stores high-ammonia wastewater, and the liquid alkali metering tank stores liquid alkali.

[0013] Furthermore, the sulfuric acid metering tank stores dilute sulfuric acid with a pH of 1-3.

[0014] The utility model adopts the above technical scheme, and has the following advantages compared with the prior art: the high-ammonia sewage in the high-ammonia sewage tank enters the first circulation tank, the liquid alkali in the liquid alkali metering tank enters the first circulation tank, and the pH in the first circulation tank is adjusted to 11. Under this condition, the ammonia in the sewage mainly exists in the form of free ammonia, the sewage in the first circulation tank is transported to the first spray layer through a pipeline and sprayed downward, the air heated by the heating furnace enters the bubbling tower through the first air inlet, the heated air blows out the ammonia nitrogen components in the high-ammonia sewage sprayed downward, so that the ammonia nitrogen components are separated from the high-ammonia sewage, and at the same time the first demisting layer removes large droplets, and the formed ammonia gas is transported from the first air outlet to the second air inlet, the high-ammonia sewage sprayed from the first spray layer re-enters the first circulation tank for multiple cycles, and when the pH in the first circulation tank is 7, it is proved that the high-ammonia sewage in the first circulation tank is completely treated, and the treated high-ammonia sewage is discharged into the recovery tank to wait for the next step of treatment.

[0015] Ammonia enters the absorption tower from bottom to top through the second air inlet, and the dilute sulfuric acid in the sulfuric acid metering tank enters the second circulation tank. The dilute sulfuric acid is transported to the second spray layer through a pipeline and sprayed downward. The ammonia is in close contact with the dilute sulfuric acid flowing in the opposite direction, and reacts to form ammonium sulfate solution. The remaining ammonia is circulated again through the circulating fan, and the ammonium sulfate solution and the remaining dilute sulfuric acid sprayed from the second spray layer re-enter the second circulation tank for recycling. When the density meter detects that the content of dilute sulfuric acid in the second circulation tank is 20%, it proves that the second circulation tank contains only ammonium sulfate solution. The ammonium sulfate solution is discharged into the three-effect evaporator, and ammonium sulfate is formed after evaporation and crystallization, which is collected and used.

[0016] A heating furnace is used to heat the air to blow off the high-ammonia wastewater, thereby improving the stripping efficiency. At the same time, dilute sulfuric acid is used to absorb the ammonia gas, and the ammonium sulfate solution generated by the reaction is evaporated and crystallized to form ammonium sulfate, turning waste into treasure. While eliminating the high-ammonia wastewater, the ammonia in the high-ammonia wastewater is also converted into ammonium sulfate products, thereby improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a sewage deammoniation device in an embodiment of the utility model.

[0018] In the figure: 1-bubble tower, 2-first circulation tank, 3-circulation fan, 4-heating furnace, 5-induced draft fan, 6-liquid alkali metering tank, 7-sulphuric acid metering tank, 8-absorption tower, 9-second circulation tank, 10-first spray layer, 11-first demisting layer, 12-first air inlet, 13-high ammonia sewage tank, 14-first air outlet, 15-first liquid outlet, 16-second air outlet, 17-second demisting layer, 18-second spray layer, 19-second liquid outlet, 20-second air inlet, 21-first filler, 22-second filler, 23-three-effect evaporator, 24-recovery tank, 25-density meter. DETAILED DESCRIPTION

[0019] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] Examples, such as Figure 1 As shown, a sewage deammoniation device includes a hot air system, a bubbling system and an absorption system connected in sequence, and the hot air system includes an induced draft fan 5, a heating furnace 4 and a circulating fan 3.

[0021] The bubbling system comprises a bubbling tower 1, a first circulation tank 2 and a liquid alkali metering tank 6. The top of the bubbling tower 1 is provided with a first air outlet 14, the bottom of the bubbling tower 1 is provided with a first liquid outlet 15, the lower part of the tower wall of the bubbling tower 1 is provided with a first air inlet 12, and the bubbling tower 1 comprises a first demisting layer 11, a first spraying layer 10 and a first filler 21 from top to bottom. The outlet of the heating furnace 4 is connected to the first air inlet 12 of the bubbling tower 1, and the air outlet of the circulation fan 3 is connected to the air inlet of the heating furnace 4. The fan 5 is arranged between the air outlet of the circulating fan 3 and the air inlet of the heating furnace 4, the first liquid outlet 15 is connected to the first circulation tank 2, the first circulation tank 2 is connected to the recovery tank 24, the outlet at the bottom of the first circulation tank 2 is connected to the first spray layer 10, the first circulation tank 2 is connected to the high ammonia sewage tank 13, the outlet of the liquid alkali metering tank 6 and the outlet of the high ammonia sewage tank 13 are respectively connected to the first circulation tank 2, the high ammonia sewage tank 13 stores high ammonia sewage, and the liquid alkali metering tank 6 stores liquid alkali.

[0022] The absorption system includes an absorption tower 8, a second circulation tank 9 and a sulfuric acid metering tank 7. The top of the absorption tower 8 is provided with a second air outlet 16, the bottom of the absorption tower 8 is provided with a second liquid outlet 19, and the lower part of the tower wall of the absorption tower 8 is provided with a second air inlet 20. The absorption tower 8 includes a second demisting layer 17, a second spray layer 18 and a second filler 22 from top to bottom. The second air inlet 20 is connected to the first air outlet 14, the second liquid outlet 19 is connected to the second circulation tank 9, the second circulation tank 9 is connected to a density meter 25 and a three-effect evaporator 23, the outlet at the bottom of the second circulation tank 9 is connected to the second spray layer 18, the outlet of the sulfuric acid metering tank 7 is connected to the second circulation tank 9, and the second air outlet 16 of the absorption tower 8 is connected to the air inlet of the circulation fan 3.

[0023] The sulfuric acid metering tank 7 stores dilute sulfuric acid with a pH of 1-3.

[0024] The first filler 21 and the second filler 22 are used to accelerate reaction mass transfer and increase the gas-liquid contact area.

[0025] Working principle: the high-ammonia sewage in the high-ammonia sewage tank 13 enters the first circulation tank 2, and the liquid alkali in the liquid alkali metering tank 6 enters the first circulation tank 2, and the pH in the first circulation tank 2 is adjusted to 11. Under this condition, the ammonia in the sewage mainly exists in the form of free ammonia. The sewage in the first circulation tank 2 is transported to the first spray layer 10 through a pipeline and sprayed downward. The air heated by the heating furnace 4 enters the bubbling tower 1 through the first air inlet 12. The heated air blows out the ammonia nitrogen component in the high-ammonia sewage sprayed downward, so that the ammonia nitrogen component is separated from the high-ammonia sewage. At the same time, the first demisting layer 11 removes large droplets, and the formed ammonia gas is transported to the second air inlet 20 from the first air outlet 14. The high-ammonia sewage sprayed from the first spray layer 10 re-enters the first circulation tank 2 for multiple cycles. When the pH in the first circulation tank 2 is 7, it proves that the high-ammonia sewage in the first circulation tank 2 is completely treated, and the treated high-ammonia sewage is discharged into the recovery tank 24 to wait for the next step of treatment.

[0026] Ammonia enters the absorption tower 8 from bottom to top through the second air inlet 20, and the dilute sulfuric acid in the sulfuric acid metering tank 7 enters the second circulation tank 9, and the dilute sulfuric acid is transported to the second spray layer 18 through a pipeline and sprayed downward. The ammonia gas is in close contact with the dilute sulfuric acid flowing in the opposite direction, and reacts to form an ammonium sulfate solution. The remaining ammonia gas is circulated again through the circulation fan 3, and the ammonium sulfate solution and the remaining dilute sulfuric acid sprayed from the second spray layer 18 re-enter the second circulation tank 9 for recycling. When the density meter 25 detects that the content of dilute sulfuric acid in the second circulation tank 9 is 20%, it proves that the second circulation tank 9 contains only ammonium sulfate solution, and the ammonium sulfate solution is discharged into the three-effect evaporator 23, and ammonium sulfate is formed after evaporation and crystallization, which is collected and used.

[0027] The heating furnace 4 is used to heat the air to blow off the high-ammonia wastewater, thereby improving the stripping efficiency. At the same time, dilute sulfuric acid is used to absorb the ammonia gas, and the ammonium sulfate solution generated by the reaction is evaporated and crystallized to form ammonium sulfate, turning waste into treasure. While eliminating the high-ammonia wastewater, the ammonia in the high-ammonia wastewater is also converted into ammonium sulfate products, thereby improving economic benefits.

[0028] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A device for deammoniation of sewage, characterized in that: It comprises a hot air system, a bubbling system and an absorption system which are connected in sequence, wherein the hot air system comprises an induced draft fan (5), a heating furnace (4) and a circulating fan (3); The bubbling system comprises a bubbling tower (1), a first circulation tank (2) and a liquid caustic soda metering tank (6); The absorption system comprises an absorption tower (8), a second circulation tank (9) and a sulfuric acid metering tank (7).

2. A sewage deammoniation device as claimed in claim 1, characterized in that: The top of the bubbling tower (1) is provided with a first gas outlet (14), the bottom of the bubbling tower (1) is provided with a first liquid outlet (15), the lower part of the bubbling tower (1) is provided with a first gas inlet (12), and the bubbling tower (1) comprises, from top to bottom, a first demisting layer (11), a first spraying layer (10) and a first filler (21).

3. A sewage deammoniation device as claimed in claim 2, characterized in that: The top of the absorption tower (8) is provided with a second gas outlet (16), the bottom of the absorption tower (8) is provided with a second liquid outlet (19), the lower part of the absorption tower (8) is provided with a second gas inlet (20), the second gas inlet (20) is communicated with the first gas outlet (14), and the absorption tower (8) includes a second demisting layer (17), a second spray layer (18) and a second filler (22) in sequence from top to bottom.

4. A sewage deammoniation device as claimed in claim 2, characterized in that: The outlet of the heating furnace (4) is connected to the first air inlet (12) of the bubbling tower (1), the air outlet of the circulating fan (3) is connected to the air inlet of the heating furnace (4), and the induced draft fan (5) is arranged between the air outlet of the circulating fan (3) and the air inlet of the heating furnace (4); The first liquid outlet (15) is in communication with the first circulation tank (2), the first circulation tank (2) is in communication with the recovery tank (24), the outlet at the bottom of the first circulation tank (2) is in communication with the first spray layer (10), the first circulation tank (2) is in communication with the high ammonia wastewater tank (13), and the liquid alkali metering tank (6) is in communication with the first circulation tank (2).

5. A sewage deammoniation device as claimed in claim 3, characterized in that: The second liquid outlet (19) is in communication with the second circulation tank (9), the second circulation tank (9) is in communication with a density meter (25) and a triple-effect evaporator (23), the outlet at the bottom of the second circulation tank (9) is in communication with the second spray layer (18), and the outlet of the sulfuric acid metering tank (7) is in communication with the second circulation tank (9).

6. A sewage deammoniation device as claimed in claim 3, characterized in that: The second air outlet (16) of the absorption tower (8) is in communication with the air inlet of the circulation fan (3).

7. A sewage deammoniation device as claimed in claim 4, characterized in that: The high-ammonia wastewater tank (13) stores high-ammonia wastewater, and the liquid alkali metering tank (6) stores liquid alkali.

8. A sewage deammoniation device as claimed in claim 5, characterized in that: The sulfuric acid metering tank (7) stores dilute sulfuric acid with a pH of 1-3.

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