CN215403612U

CN215403612U - Ammonium nitrate wastewater treatment system

Info

Publication number: CN215403612U
Application number: CN202122241501.7U
Authority: CN
Inventors: 黄贻展; 陈小东; 金世春; 邢天勇
Original assignee: Zibo Jiahua New Material Co ltd
Current assignee: Zibo Jiahua New Material Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-01-04
Anticipated expiration: 2031-09-15

Abstract

The utility model relates to a wastewater treatment device, in particular to an ammonium nitrate wastewater treatment system. The system comprises a wastewater ground pool, wherein the wastewater ground pool is sequentially connected with a water pump A, an online conductivity meter, an electromagnetic flowmeter B and a pipeline mixer through pipelines, the pipeline mixer is also connected with a liquid caustic soda pipeline, the electromagnetic flowmeter A is arranged on the liquid caustic soda pipeline, and the electromagnetic flowmeter A, the online conductivity meter and the electromagnetic flowmeter B are electrically connected; the pipeline mixer is sequentially connected with an online pH meter, a plate-and-frame filter press A, a wastewater blending storage tank, a water suction pump B, a stripping deamination tower, a plate-and-frame filter press B, an adjusting tank, an air flotation machine, a catalytic tower, a multi-stage filtration device, an electrodialysis device, a reverse osmosis membrane device, an EDI system and a purified water storage tank through pipelines, and the electrodialysis device is also connected with an evaporation crystallization device. The system has the advantages of continuous operation, good sealing, high production efficiency, simple ammonia gas collection, no environmental pollution, small overall energy consumption, low treatment cost, good treatment effect and stable and good effluent quality.

Description

Ammonium nitrate wastewater treatment system

Technical Field

The utility model relates to a wastewater treatment device, in particular to an ammonium nitrate wastewater treatment system.

Background

At present, the treatment method of ammonium nitrate wastewater generally comprises the following steps: firstly blending, then deaminating, wherein the removed ammonia gas is used for preparing ammonia water and the like, and the deaminated wastewater is used for preparing sodium nitrate.

The allotment is important link wherein, and traditional allotment mode adopts area stirring ground pond or retort allotment, and intermittent operation, production efficiency is low, and because of there is a large amount of ammonia production in the allotment process simultaneously, area stirring ground pond or retort have airtight defect, and it is more complicated to collect the ammonia system, easily causes the ammonia to leak, the polluted environment, and operational environment is abominable.

In addition, when the caustic soda liquid is used for blending, the usage amount of the caustic soda liquid is generally controlled by adopting a mode of measuring the pH value on line, however, ammonia gas generated in the blending process reacts with water to form ammonia water, and the ammonia water and ammonium nitrate in the wastewater form a buffer solution system, so that the pH measurement result is inaccurate, and further the addition amount of the caustic soda liquid is inaccurate.

The existing ammonium nitrate wastewater treatment system generally has the problems of high energy consumption, high treatment cost, poor treatment effect and poor effluent quality.

SUMMERY OF THE UTILITY MODEL

According to the defects in the prior art, the ammonium nitrate wastewater treatment system provided by the utility model has the advantages of continuous operation, closed operation, good sealing, high production efficiency, simple ammonia gas collection, excellent working environment, no environmental pollution, low overall energy consumption, low treatment cost, good treatment effect and stable and good effluent quality.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the ammonium nitrate wastewater treatment system comprises a wastewater ground pool, wherein the wastewater ground pool is sequentially connected with a water pump A, an online conductivity meter, an electromagnetic flowmeter B and a pipeline mixer through pipelines;

the pipeline mixer is sequentially connected with an online pH meter, a plate-and-frame filter press A, a wastewater blending storage tank, a water suction pump B, a stripping deamination tower, a plate-and-frame filter press B, an adjusting tank, an air flotation machine, a catalytic tower, a multi-stage filtration device, an electrodialysis device, a reverse osmosis membrane device, an EDI system and a purified water storage tank through pipelines, and the electrodialysis device is also connected with an evaporation crystallization device.

Wherein:

preferably, the multistage filtering device comprises a quartz sand filter, a microfiltration device, a ceramic membrane filter and an ultrafiltration device which are connected in sequence.

Preferably, the evaporative crystallization equipment is a triple-effect evaporative crystallizer.

Preferably, the concentrated water outlet of the reverse osmosis membrane device is connected with the water inlet of the electrodialysis device.

The working principle and the process are as follows:

when the system works, the ammonium nitrate wastewater in the wastewater ground pool and the liquid caustic soda are mixed and allocated in the pipeline mixer, the content of the ammonium nitrate in the wastewater is calculated by measuring the conductivity of the wastewater through the online conductivity meter, the using amount of the liquid caustic soda is further calculated, and the flow of the liquid caustic soda and the flow of the ammonium nitrate are measured through the electromagnetic flowmeter A and the electromagnetic flowmeter B.

And (3) performing filter pressing on the blended wastewater through a plate-and-frame filter press A, then feeding the wastewater into a wastewater blending storage tank for storage, pumping the wastewater in the wastewater blending storage tank into a stripping deamination tower through a water suction pump B for deamination, and using the removed ammonia gas for preparing ammonia water. And (3) carrying out filter pressing on the deaminated wastewater by a plate-and-frame filter press B, then feeding the deaminated wastewater into an adjusting tank to adjust the pH value to be neutral, primarily removing suspended matters by an air floatation machine, then feeding the deaminated wastewater into a catalytic tower to remove COD, removing the COD to be lower than 100, and then feeding the deaminated wastewater into multistage filtration equipment to carry out filtration.

The multistage filtering equipment comprises a quartz sand filter, a microfiltration device, a ceramic membrane filter and an ultrafiltration device which are sequentially connected, the filtering precision is gradually increased, and the filtering pressure of the rear filtering equipment can be reduced.

And (3) allowing the wastewater after multistage filtration to enter electrodialysis equipment, allowing the concentrated water to enter evaporation crystallization equipment for evaporation crystallization, and drying the crystallized sodium nitrate to obtain a sodium nitrate product. Fresh water sequentially enters the reverse osmosis membrane equipment, the fresh water of the reverse osmosis membrane equipment enters the EDI system to be treated, the obtained purified water enters the purified water storage tank to be stored, and the purified water can be directly recycled to production. And returning the concentrated water of the reverse osmosis membrane equipment to the electrodialysis equipment for treatment.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model adopts the online conductivity meter to measure the conductivity to control the adding amount of the liquid caustic soda, the liquid caustic soda and the ammonium nitrate wastewater are blended in the pipeline mixer, the blending process can be continuously operated, the sealing operation is realized, the sealing is good, the production efficiency is high, the ammonia gas leakage condition can not occur, the working environment is good, and the environment is not polluted.

2. The ammonium nitrate wastewater treatment system disclosed by the utility model is small in overall energy consumption, low in treatment cost, good in treatment effect and stable and good in effluent quality.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure: 1. a liquid caustic line; 2. an electromagnetic flow meter A; 3. a waste water ground pool; 4. a water pump A; 5. an on-line conductivity meter; 6. an electromagnetic flow meter B; 7. a pipeline mixer; 8. an online pH meter; 9. a plate-and-frame filter press A; 10. a wastewater blending storage tank; 11. a water pump B; 12. stripping deamination tower; 13. a plate-and-frame filter press B; 14. a regulating tank; 15. an air flotation machine; 16. a catalytic tower; 17. a quartz sand filter; 18. microfiltration equipment; 19. a ceramic membrane filter; 20. ultrafiltration equipment; 21. an electrodialysis apparatus; 22. evaporative crystallization equipment; 23. reverse osmosis membrane equipment; 24. an EDI system; 25. and (5) a purified water storage tank.

Detailed Description

The present invention will be further described with reference to the following examples.

Example 1

As shown in fig. 1, the ammonium nitrate wastewater treatment system comprises a wastewater pool 3, wherein the wastewater pool 3 is sequentially connected with a water pump a4, an online conductivity meter 5, an electromagnetic flowmeter B6 and a pipeline mixer 7 through pipelines, the pipeline mixer 7 is further connected with a liquid caustic soda pipeline 1, the liquid caustic pipeline 1 is provided with an electromagnetic flowmeter a2, and the electromagnetic flowmeter a2, the online conductivity meter 5 and the electromagnetic flowmeter B6 are electrically connected;

the pipeline mixer 7 is sequentially connected with an online pH meter 8, a plate-and-frame filter press A9, a wastewater blending storage tank 10, a water pump B11, a stripping deamination tower 12, a plate-and-frame filter press B13, a regulating tank 14, an air flotation machine 15, a catalytic tower 16, a multistage filtering device, an electrodialysis device 21, a reverse osmosis membrane device 23, an EDI system 24 and a purified water storage tank 25 through pipelines, and the electrodialysis device 21 is also connected with an evaporation crystallization device 22.

The multistage filtering device comprises a quartz sand filter 17, a microfiltration device 18, a ceramic membrane filter 19 and an ultrafiltration device 20 which are connected in sequence.

The evaporative crystallization device 22 is a triple-effect evaporative crystallizer.

The concentrated water outlet of the reverse osmosis membrane device 23 is connected with the water inlet of the electrodialysis device 21.

And a pH meter is arranged in the regulating tank 14 and is used for monitoring pH.

When the system works, ammonium nitrate wastewater in the wastewater pool 3 and liquid caustic soda are mixed and prepared in the pipeline mixer 7, the content of ammonium nitrate in the wastewater is calculated by measuring the conductivity of the wastewater through the online conductivity meter 5, the using amount of the liquid caustic soda is further calculated, and the flow rates of the liquid caustic soda and the ammonium nitrate are measured through the electromagnetic flowmeter A2 and the electromagnetic flowmeter B6. Adjusting the pH value to 11.5-12 in the blending step.

The blended wastewater is subjected to pressure filtration by a plate-and-frame filter press A9 and then enters a wastewater blending storage tank 10 for storage, the wastewater in the wastewater blending storage tank 10 is pumped into a stripping deamination tower 12 by a water pump B11 for deamination, and the removed ammonia gas is used for preparing ammonia water. The deaminated wastewater is subjected to pressure filtration by a plate-and-frame filter press B13, enters an adjusting tank 14, is adjusted to be neutral in pH value, is subjected to preliminary suspended matter removal by an air flotation machine 15, enters a catalytic tower 16 to remove COD, is removed to be lower than 100, and enters multistage filtration equipment for filtration.

The multistage filtering equipment comprises a quartz sand filter 17, a microfiltration equipment 18, a ceramic membrane filter 19 and an ultrafiltration equipment 20 which are connected in sequence, the filtering precision is increased step by step, and the filtering pressure of the rear filtering equipment can be reduced. The purpose of the multistage filtration is to remove as much as possible the solid particles in the water and to prevent the solid particles from entering the electrodialysis apparatus 21 and causing fouling.

And (3) the wastewater after the multi-stage filtration enters an electrodialysis device 21, the concentrated water enters an evaporation crystallization device 22 for evaporation crystallization, and sodium nitrate obtained by crystallization is dried to obtain a sodium nitrate product. Fresh water sequentially enters the reverse osmosis membrane equipment 23, the fresh water of the reverse osmosis membrane equipment 23 enters the EDI system 24 for treatment, the obtained purified water enters the purified water storage tank 25 for storage, and the purified water can be directly recycled to production. The concentrated water of the reverse osmosis membrane device 23 is returned to the electrodialysis device 21 for treatment. Firstly, the electrodialysis device 21 is adopted for treatment, and then the treatment is carried out in the evaporative crystallization device 22 for evaporative crystallization, so that the consumption of steam can be reduced, and the energy consumption is obviously reduced.

If words such as "A", "B", etc. are used herein to define parts, those skilled in the art will appreciate that: the terms "a" and "B" are used merely to distinguish elements for convenience in description and have no special meaning unless otherwise stated.

Based on the technical idea of the present invention, other persons skilled in the art can make several improvements and modifications to the present invention, but all fall into the scope of the present invention.

Claims

1. An ammonium nitrate wastewater treatment system, includes waste water ground pond (3), its characterized in that: the waste water ground pool (3) is sequentially connected with a water pump A (4), an online conductivity meter (5), an electromagnetic flowmeter B (6) and a pipeline mixer (7) through pipelines, the pipeline mixer (7) is also connected with a liquid caustic soda pipeline (1), an electromagnetic flowmeter A (2) is arranged on the liquid caustic soda pipeline (1), and the electromagnetic flowmeter A (2), the online conductivity meter (5) and the electromagnetic flowmeter B (6) are electrically connected;

the pipeline mixer (7) is sequentially connected with an online pH meter (8), a plate-and-frame filter press A (9), a wastewater blending storage tank (10), a water suction pump B (11), a stripping deamination tower (12), a plate-and-frame filter press B (13), an adjusting tank (14), an air flotation machine (15), a catalytic tower (16), a multistage filtering device, an electrodialysis device (21), a reverse osmosis membrane device (23), an EDI system (24) and a purified water storage tank (25) through pipelines, and the electrodialysis device (21) is further connected with an evaporation crystallization device (22).

2. The ammonium nitrate wastewater treatment system according to claim 1, wherein: the multistage filtering device comprises a quartz sand filter (17), a microfiltration device (18), a ceramic membrane filter (19) and an ultrafiltration device (20) which are connected in sequence.

3. The ammonium nitrate wastewater treatment system according to claim 1, wherein: the evaporative crystallization equipment (22) is a triple-effect evaporative crystallizer.

4. The ammonium nitrate wastewater treatment system according to claim 1, wherein: and a concentrated water outlet of the reverse osmosis membrane device (23) is connected with a water inlet of the electrodialysis device (21).