Efficient and energy-saving blow-off deamination device

Abstract

The invention provides an efficient and energy-saving blow-off deamination device, the difference between the actual concentration and the equilibrium concentration of volatile substances such as ammonia nitrogen contained in wastewater is utilized, air is used for blow-off under the alkaline condition, gas is continuously discharged in the blow-off process, the concentration of ammonia gas in a gas phase is changed, and the ammonia gas concentration in the gas phase is changed. Therefore, the actual concentration is always smaller than the equilibrium concentration under the condition, and finally ammonia dissolved in the wastewater continuously passes through a gas-liquid interface, so that the ammonia in the wastewater is removed.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment engineering and environmental protection, and in particular to a high-efficiency and energy-saving air stripping and deammonification device. Background Art

[0002] The specific principle of stripping ammonia is to use the difference between the actual concentration and the equilibrium concentration of volatile substances such as ammonia nitrogen contained in the wastewater. Air stripping is used under alkaline conditions. Since the gas is continuously discharged during the stripping process, the ammonia concentration in the gas phase is changed, so that its actual concentration is always less than the equilibrium concentration under the conditions, and finally the ammonia dissolved in the wastewater continuously passes through the gas-liquid interface, so that the ammonia in the wastewater can be removed. The equilibrium relationship is as follows: The key to improving the efficiency of stripping ammonia is to shift the above reaction balance to the right. This technology currently has the following common problems: this technology often uses air as a carrier, but the stripping efficiency of ammonia nitrogen is low when using normal temperature air; a blower is required, which consumes a lot of power.

[0003] The existing patent application (CN106348374A) discloses a method for treating wastewater by deammoniation by air blowing and ammonia recovery by spraying, including the steps of treating wastewater by deammoniation and ammonia recovery. The method for treating wastewater by deammoniation obtained by the present invention takes pH value as a key regulating factor, realizes the organic combination of various treatment links, efficiently removes ammonia nitrogen pollutants in wastewater, and makes the ammonia nitrogen content in the treated wastewater meet the secondary discharge standard requirements in GB8978-1996 "Comprehensive Sewage Discharge Standard".

[0004] Therefore, there is a need for an efficient and energy-saving air stripping and deammonification device that utilizes aeration air from a sewage treatment system in a sewage treatment plant without additionally arranging a fan. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a high-efficiency and energy-saving air stripping and deammonification device, which can effectively remove ammonia from wastewater and recover ammonia to produce ammonia gas or ammonium salt. The device has the advantages of high deammonification efficiency, energy saving, waste gas resource utilization, and low operating cost.

[0006] The invention provides a high-efficiency and energy-saving air stripping and deammonification device, comprising a deammonification tower and a pickling tower, wherein the deammonification tower and the pickling tower are connected via a pipeline, and the carrier gas is aeration air of a sewage treatment system of a sewage treatment plant.

[0007] The present invention discloses a high-efficiency and energy-saving air stripping and deamination device. As a preferred embodiment, the deamination tower comprises a deamination tower body, a first air outlet, a first head cover, a first demisting layer, a first spraying device, a first circulation pipeline, a first filler, a first circulation pump, a main air inlet, a first water pump liquid inlet pipe, a first window, a first drain, a first sieve plate support and an electric ball valve. The deamination tower body is provided with a first air outlet at the top, a first head cover, a first demisting layer and a first filler are provided above the tower body in sequence, a first sieve plate support is provided below the first filler, a first water pump liquid inlet pipe is provided at the lower part of the tower body, the first water pump liquid inlet pipe is connected to the first circulation pump and the first circulation pipeline in sequence, the first circulation pipeline is connected to the first spraying device, a main air inlet and a first drain are provided at the lower part of the tower body, the first window is provided at the filler position of the tower body, and the electric ball valve is provided below the first sieve plate support.

[0008] The present invention discloses a high-efficiency and energy-saving air stripping and deammonification device. As a preferred embodiment, the pickling tower comprises a pickling tower body, a second air outlet, a second head cover, a second demisting layer, a second spraying device, a second circulation pipeline, a second filler, an acid supplementation port, a second circulation pump, an air inlet, a second water pump inlet pipe, a second window, a second drain, a level gauge flange and a second sieve plate support. The top of the tower body is provided with a second air outlet, the top of the tower body is provided with a second head cover, a second demisting layer and a second filler in sequence, the lower part of the pickling tower body is provided with a second water pump inlet pipe, the second window is arranged at the second filler position of the tower body, the second filler is a plurality of layers arranged at intervals, a second spraying device is provided above each layer of the second filler, a second sieve plate support is provided below each layer of the second filler, the acid supplementation port is connected with the second water pump inlet pipe, the second circulation pump and the second circulation pipeline in sequence, the second circulation pipeline is connected with the second spraying device, and the lower part of the tower body is provided with an acid supplementation port, a level gauge flange and a second drain.

[0009] The present invention discloses a highly efficient and energy-saving air stripping and deammonification device, and the method of use is as follows: the high-temperature carrier gas provided by the aeration fan enters the bottom of the deammonification tower through the main air inlet, and under the action of wind pressure, the carrier gas flows toward the top of the tower, flows through the first filler during the flow, mixes with the waste liquid to be treated, and removes ammonia in the waste liquid. Continue to flow upward, mix with the waste liquid sprayed by the first spray device, so that the gas-liquid mixture is more uniform. The carrier gas that continues to flow upward passes through the first demisting layer to remove the water mist in the carrier gas. Then it is discharged through the first air outlet and discharged to the acid washing tower for subsequent disposal.

[0010] The wastewater to be deammonified enters the deammonification tower through the first water pump inlet pipe, is lifted to the top of the tower by the first circulation pump and the first circulation pipeline, and is evenly sprayed into the tower through the first spray device to increase the contact area between the waste liquid and the carrier gas to enhance the deammonification effect. The wastewater to be deammonified flows to the bottom of the tower by its own weight at the top of the tower, flows through the first filler, and is fully in contact with the carrier gas. The wastewater deammonification reaction formula is: When the high-temperature carrier gas is introduced into the system and mixed with the wastewater to be deammonified, the water temperature rises and the equilibrium moves to the right, which is more conducive to the conversion of ammonium ions in the water into ammonia gas, which is discharged through the second air outlet together with the carrier gas.

[0011] The carrier gas and ammonia mixed gas discharged from the front-end deammonification tower enters the air inlet through the air duct and enters the acid washing tower. Under the action of wind pressure, the carrier gas flows to the top of the tower, and in the process of flowing, it flows through the filler and the spray device in turn, and mixes with the acid solution. The ammonia in the carrier gas reacts with the acid solution. The reaction formula is as follows: 2NH3+H2SO4===(NH4)2SO4. The filler arrangement and the spray device adopt a multi-stage arrangement to ensure that the acid solution and the gas are fully mixed and reacted to remove the ammonia in the carrier gas. The carrier gas that has been deammonified continues to flow upward, passes through the demisting layer, and removes the water mist in the carrier gas. It is then discharged through the second air outlet and discharged to the aeration wind point of the back-end water treatment equipment.

[0012] The invention provides a high-efficiency and energy-saving air stripping and ammonia removal device, which can effectively remove ammonia in wastewater and simultaneously recover ammonia to produce ammonia gas or ammonium salt. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a high-efficiency and energy-saving air stripping and ammonia removal device of the present invention.

[0014] 1. Deamination tower; 11. Deamination tower body; 12. First air outlet; 13. First head cover; 14. First demisting layer; 15. First spray device; 16. First circulation pipeline; 17. First filler; 18. First circulation pump; 19. Main air inlet; 110. First water pump inlet pipe; 111. First viewing window; 112. First drain outlet; 113. First sieve plate support; 2. Pickling tower; 21. Pickling tower body; 22. Second air outlet; 23. Second head cover; 24. Second demisting layer; 25. Second spray device; 26. Second circulation pipeline; 27. Second filler; 28. Acid replenishing port; 29. ​​Second circulation pump; 210. Air inlet; 211. Second water pump inlet pipe; 212. Second viewing window; 213. Second drain outlet; 214. Level gauge flange; 215. Second sieve plate support. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] Example 1

[0017] like Figure 1As shown, the high-temperature carrier gas provided by the aeration fan enters the bottom of the deamination tower body 11 through the main air inlet 19 of the deamination tower 1. Under the action of wind pressure, the carrier gas flows to the top of the tower, flows through the first filler 17 during the flow, mixes with the waste liquid to be treated, and removes ammonia in the waste liquid. Continue to flow upward and mix with the waste liquid sprayed by the first spray device 15 to make the gas-liquid mixture more uniform. The carrier gas that continues to flow upward passes through the first demisting layer 14 to remove the water mist in the carrier gas. Then it is discharged through the first air outlet 12 and discharged to the pickling tower 2 for subsequent disposal.

[0018] The wastewater to be deammonified enters the deammonification tower 2 through the first water pump inlet pipe 110, is lifted to the top of the tower by the first circulation pump 18 and the first circulation pipeline 16, and is evenly sprayed into the tower through the first spray device 15, so that the contact area between the waste liquid and the carrier gas is increased to enhance the deammonification effect. The wastewater to be deammonified flows to the bottom of the tower by its own weight at the top of the tower, flows through the first filler 17, and is fully in contact with the carrier gas. The wastewater deammonification reaction formula is: When the high-temperature carrier gas is introduced into the system and mixed with the wastewater to be deammonified, the water temperature rises and the equilibrium moves to the right, which is more conducive to the conversion of ammonium ions in the water into ammonia gas, which is discharged through the first air outlet 12 together with the carrier gas.

[0019] The carrier gas and ammonia mixed gas discharged from the deammonification tower 1 enters the air inlet 210 through the air duct and enters the pickling tower 2. Under the action of wind pressure, the carrier gas flows to the top of the tower, and in the process of flowing, it flows through the second filler 27 and the second spray device 25 in turn, mixes with the acid solution, and the ammonia in the carrier gas reacts with the acid solution. The reaction formula is as follows: 2NH3+H2SO4===(NH4)2SO4. The second filler 27 and the second spray device 25 are arranged in multiple stages to ensure that the acid solution and the gas are fully mixed and reacted to remove the ammonia in the carrier gas. The carrier gas that has been deammonified continues to flow upward, passes through the second demisting layer 24, and removes the water mist in the carrier gas. It is then discharged through the second air outlet 22 and discharged to the aeration wind point of the rear-end water treatment equipment.

[0020] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that any modification, change or equivalent that can be made without departing from the spirit and scope defined by the claims will fall within the protection scope of the present invention.

Claims

1. A highly efficient and energy-saving air stripping and deammoniation device, Features: The invention comprises a deamination tower (1) and a pickling tower (2), wherein the deamination tower (1) and the pickling tower (2) are connected via a pipeline, and a main air inlet (19) is provided at the lower part of the deamination tower body (11) of the deamination tower (1), through which a carrier gas enters the bottom of the deamination tower body (11), and under the action of wind pressure, the carrier gas flows toward the top of the deamination tower, flows through a first filler (17) during the flow, mixes with waste liquid to be treated, removes ammonia in the waste liquid, continues to flow upward, mixes with waste liquid sprayed by a first spray device (15), continues to flow upward through a first demisting layer (14), removes water mist in the carrier gas, and is then discharged through a first air outlet (12) to the pickling tower (2); the carrier gas is aeration air of a sewage treatment system of a sewage treatment plant.

2. According to the high-efficiency and energy-saving air stripping and deammonification device of claim 1, Features: The deamination tower (1) further comprises a first air outlet (12) arranged at the top of the deamination tower body (11); a first head cover (13), a first demisting layer (14), a first filler (17) and a first sieve plate support (113) are arranged in sequence above the deamination tower body (11); a first water pump liquid inlet pipe (110) is arranged at the lower part of the tower body (11); waste liquid to be treated enters through the first water pump liquid inlet pipe (110), is lifted to the top of the tower by a first circulation pump (18) and a first circulation pipeline (16), and is sprayed by a first spray device (15).

3. A highly efficient and energy-saving air stripping and deammonification device according to claim 1, Features: The pickling tower (2) has a second air outlet (22) at the top of the pickling tower body (21), a second head cover (23), a second demisting layer (24), and a second filler (27) arranged in sequence above the pickling tower body (21), a second water pump liquid inlet pipe (211) is arranged at the lower part of the pickling tower body (21), a second viewing window (212) is arranged at the position of the second filler (27) of the pickling tower body (21), and a second circulation pipeline (26) is arranged outside the pickling tower body (21), and the second circulation pipeline (26) is connected to a second spray device (25).

4. A highly efficient and energy-saving air stripping and deammonification device according to claim 3, Features: The second filler (27) is composed of a plurality of layers arranged at intervals, the second spray device (25) is provided above each layer of the second filler (27), and the second sieve plate support (215) is provided below each layer of the second filler (27).

5. A highly efficient and energy-saving air stripping and deammonification device according to claim 3, Features: An acid replenishing port (28) is provided at the lower part of the pickling tower body (21), and the acid liquid enters from the acid replenishing port (28), is lifted to the top of the tower through the second water pump liquid inlet pipe (211), the second circulation pump (29), and the second circulation pipeline (26), and is sprayed through the second spraying device (25).

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