Low-energy consumption ammonia-nitrogen wastewater treatment device

Abstract

The utility model relates to a kind of ammonia-nitrogen wastewater treatment devices of low energy consumption, belong to molecular sieve wastewater treatment field.The ammonia gas pipeline is provided with ammonia gas induced draft fan, ammonia-nitrogen reflux line is provided at the top of ammonium sulfate absorption tower, and dilute sulfuric acid spraying and ammonium sulfate circulating spraying are arranged in the upper part of tower;Ammonium sulfate pipeline is provided with ammonium sulfate transfer pump, and the ammonium sulfate transfer pump outlet is also connected with ammonium sulfate circulating spraying.The utility model reduces the consumption of steam and cooling water in stripping wastewater deamination technology.

Description

Technical Field

[0001] This utility model relates to a low-energy-consumption ammonia nitrogen wastewater treatment device, belonging to the field of molecular sieve wastewater treatment. Background Technology

[0002] A certain amount of high-ammonia nitrogen wastewater is generated during the ammonium sulfate washing process in molecular sieve production. This wastewater needs to undergo ammonia removal treatment to meet relevant standards before discharge. Common ammonia nitrogen wastewater treatment technologies include biochemical methods, air stripping, steam stripping, breakpoint chlorination, ion exchange, chemical precipitation, and membrane separation. Among these, steam stripping is the most mature and widely used. It offers very high removal efficiency and technological maturity for high-ammonia nitrogen wastewater. However, conventional steam stripping ammonia removal technologies consume large amounts of steam and cooling water, resulting in high unit consumption per wastewater treated. Therefore, the widespread application of steam stripping ammonia removal technology requires increased research and development efforts in energy conservation and consumption reduction. Summary of the Invention

[0003] Based on the problems described in the background, the problem that this utility model aims to solve is:

[0004] How to reduce the consumption of steam and cooling water in the ammonia removal technology for stripping wastewater.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A low-energy ammonia nitrogen wastewater treatment device includes an ammonia removal distillation tower, an ammonium sulfate absorption tower, and an ammonium sulfate storage tank. High ammonia nitrogen wastewater enters from the top of the ammonia removal distillation tower, while pressurized steam enters from the bottom. The treated wastewater at the bottom of the ammonia removal distillation tower is discharged by an external pump. The top of the ammonia removal distillation tower is connected to the middle of the ammonium sulfate absorption tower via an ammonia pipeline, and the bottom of the ammonium sulfate absorption tower is connected to the ammonium sulfate storage tank via an ammonium sulfate pipeline. An ammonia gas induced draft fan is installed on the ammonia pipeline, and an ammonia nitrogen back distillation line is installed at the top of the ammonium sulfate absorption tower. Dilute sulfuric acid spray and ammonium sulfate circulating spray are arranged in the upper part of the tower. An ammonium sulfate transfer pump is installed on the ammonium sulfate pipeline, and the outlet of the ammonium sulfate transfer pump is also connected to the ammonium sulfate circulating spray.

[0007] Preferably, a pH meter is installed between the outlet of the ammonium sulfate transfer pump and the inlet of the ammonium sulfate circulating spray.

[0008] High-ammonia nitrogen wastewater enters from the top of the deammoniation distillation tower, while low-pressure steam enters from the bottom. Under alkaline conditions, they contact counter-currently within the packing layer of the deammoniation distillation tower. The ammonia nitrogen in the wastewater is released as ammonia gas, which mixes with the steam and flows into the upper space of the deammoniation distillation tower, while the deammoniation wastewater flows into the lower space.

[0009] The ammonia and water vapor mixture in the upper space is drawn into the secondary cooling absorption tower (ammonium sulfate absorption tower) by an induced draft fan. Dilute sulfuric acid is added to the ammonium sulfate absorption tower via spray for cooling and purification, generating ammonium sulfate in the bottom space. The ammonium sulfate is then self-circulated via a circulating pump in a spray form for further cooling and absorption.

[0010] The residual ammonia-containing waste gas is re-entered into the deammoniation distillation tower from the top of the ammonium sulfate absorption tower for treatment. The ammonium sulfate generated at the bottom is transferred to the storage tank for standby after passing the test and monitoring.

[0011] The beneficial effects of this utility model are:

[0012] This invention references a two-stage distillation method to convert ammonia nitrogen in ammonia nitrogen wastewater into usable ammonium sulfate through physical and chemical methods. By setting up an ammonia nitrogen back distillation line, the conversion rate of ammonia nitrogen is improved, and the steam consumption of ammonium sulfate per production unit is reduced. The ammonium sulfate absorption tower provides cooling through dilute sulfuric acid spraying and circulating spraying, forming hot and cold convection, eliminating the need for a cooler on the ammonia gas pipeline and reducing cooling water consumption. Attached Figure Description

[0013] Figure 1 This is a flowchart illustrating the process of this utility model.

[0014] In the diagram: 1 is the external discharge pump; 2 is the ammonia removal distillation tower; 3 is the ammonia induced draft fan; 4 is the ammonium sulfate absorption tower; 5 is the ammonium sulfate transfer pump; 6 is the ammonium sulfate storage tank; 7 is the pH meter; 21 is the ammonia pipeline; 41 is the ammonium sulfate pipeline; 42 is the dilute sulfuric acid spray; 43 is the ammonium sulfate circulating spray; 44 is the ammonia nitrogen reflux line. Detailed Implementation

[0015] Example 1

[0016] A low-energy ammonia nitrogen wastewater treatment device includes an ammonia removal distillation tower 2, an ammonium sulfate absorption tower 4, and an ammonium sulfate storage tank 6. High ammonia nitrogen wastewater enters from the top of the ammonia removal distillation tower 2, and pressurized steam enters from the bottom of the ammonia removal distillation tower 2. The treated wastewater at the bottom of the ammonia removal distillation tower 2 is discharged by an external discharge pump 1. The top of the ammonia removal distillation tower 2 is connected to the middle of the ammonium sulfate absorption tower 4 via an ammonia gas pipeline 21, and the bottom of the ammonium sulfate absorption tower 4 is connected to the ammonium sulfate storage tank 6 via an ammonium sulfate pipeline 41. An ammonia gas induced draft fan 3 is installed on the ammonia gas pipeline 21. An ammonia nitrogen back distillation line 44 is installed at the top of the ammonium sulfate absorption tower 4. A dilute sulfuric acid spray 42 and an ammonium sulfate circulating spray 43 are arranged in the upper part of the tower. An ammonium sulfate transfer pump 5 is installed on the ammonium sulfate pipeline 41, and the outlet of the ammonium sulfate transfer pump 5 is also connected to the ammonium sulfate circulating spray 43.

[0017] A pH meter 7 is installed between the outlet of the ammonium sulfate transfer pump 5 and the inlet of the ammonium sulfate circulating spray 43.

Claims

1. A low-energy ammonia nitrogen wastewater treatment device, comprising an ammonia removal distillation tower (2), an ammonium sulfate absorption tower (4), and an ammonium sulfate storage tank (6), wherein high ammonia nitrogen wastewater enters from the top of the ammonia removal distillation tower (2), and pressurized steam enters the ammonia removal distillation tower (2) from the bottom; the wastewater treated at the bottom of the ammonia removal distillation tower (2) is discharged by an external discharge pump (1); the top of the ammonia removal distillation tower (2) is connected to the middle of the ammonium sulfate absorption tower (4) via an ammonia pipeline (21), and the bottom of the ammonium sulfate absorption tower (4) is connected to the ammonium sulfate storage tank (6) via an ammonium sulfate pipeline (41); characterized in that, An ammonia induced draft fan (3) is installed on the ammonia pipeline (21), and an ammonia nitrogen reflux line (44) is installed at the top of the ammonium sulfate absorption tower (4). A dilute sulfuric acid spray (42) and an ammonium sulfate circulating spray (43) are arranged in the upper part of the tower. An ammonium sulfate transfer pump (5) is installed on the ammonium sulfate pipeline (41), and the outlet of the ammonium sulfate transfer pump (5) is also connected to the ammonium sulfate circulating spray (43).

2. The low-energy ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, A pH meter (7) is installed between the outlet of the ammonium sulfate transfer pump (5) and the inlet of the ammonium sulfate circulating spray (43).

3. The low-energy ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The deammoniation distillation column is a packed distillation column.

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