CN215161168U - Treatment facility of high salt high concentration nitrate nitrogen waste water - Google Patents
Treatment facility of high salt high concentration nitrate nitrogen waste water Download PDFInfo
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- CN215161168U CN215161168U CN202121379546.4U CN202121379546U CN215161168U CN 215161168 U CN215161168 U CN 215161168U CN 202121379546 U CN202121379546 U CN 202121379546U CN 215161168 U CN215161168 U CN 215161168U
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Abstract
A treatment device for high-salt high-concentration nitrate nitrogen wastewater comprises an extraction device, an extractant regeneration device and a recovery device; the extraction device comprises a primary extraction tower and a secondary extraction tower which are connected in sequence; the extractant regenerating device is used for regenerating the extractant; recovery unit is connected with extractant regeneration tower, recycles the regenerant after carrying out regeneration treatment, and this application overall structure is simple, and is easy and simple to handle, through setting up extraction device, extractant regenerating unit and recovery unit, when handling nitrate nitrogen waste water, can carry out recycle to extractant and regenerant, reduces the treatment cost, realizes the resourceful treatment of waste water.
Description
Technical Field
The utility model belongs to the waste water treatment field, concretely relates to treatment facility of high salt high concentration nitrate nitrogen waste water.
Background
Nitrate nitrogen is an important component of total nitrogen, and the pickling wastewater taking nitrate as a raw material contains a large amount of nitrate nitrogen and salt, and the nitrate nitrogen can be rapidly transferred and diffused in water to cause large-scale total nitrogen pollution.
Biological denitrification is always considered as the most economic and effective denitrification mode, but a large amount of organic matters are required to be used as electron donors in the denitrification process, and the problems of high sludge yield, difficult control of biochemical parameters, difficult culture of strains and the like exist simultaneously. These problems are particularly acute when they are applied to high concentration total nitrogen wastewater. In addition, the pickling wastewater contains a large amount of salt, and the conventional biochemical treatment needs a large amount of water to be diluted to the concentration which can be borne by biochemistry, so that the waste of water resources exists. The biochemical treatment after evaporation consumes a large amount of energy, and the operation cost is very high. Based on this, this patent proposes a treatment facility of high salt high concentration nitrate nitrogen waste water, overcomes the high salt problem in the pickling waste water to carry out resourceful treatment with the high concentration nitrate nitrogen in the waste water.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a treatment device for high-salt high-concentration nitrate nitrogen wastewater.
The utility model adopts the following technical scheme:
a treatment device for high-salt high-concentration nitrate nitrogen wastewater comprises an extraction device, an extractant regeneration device and a recovery device;
the extraction device comprises a first-stage extraction tower and a second-stage extraction tower which are sequentially connected, wherein the first-stage extraction tower and the second-stage extraction tower have the same structure, and the first-stage extraction tower comprises a tower body, filler arranged in the tower body, a heavy liquid inlet arranged on the tower body and used for wastewater to enter, a light liquid inlet arranged on the tower body and positioned below the heavy liquid inlet and used for an extractant to enter, a heavy liquid outlet arranged at the bottom of the tower body and a light liquid outlet arranged at the top of the tower body; the heavy liquid inlet of the second-stage extraction tower is connected with the heavy liquid outlet of the first-stage extraction tower;
the extractant regeneration device comprises an extractant regeneration tower and an extractant supplement tank, wherein the extractant regeneration tower is used for regenerating the extractant from the light liquid outlets of the first-stage extraction tower and the second-stage extraction tower; one end of the extractant replenishing tank is connected with the extractant regeneration tower, the other end of the extractant replenishing tank is respectively connected with the light liquid inlets of the first-stage extraction tower and the second-stage extraction tower, and the extractant regenerated by the extractant regeneration tower is sent into the first-stage extraction tower or the second-stage extraction tower again;
and the recovery device is connected with the extractant regeneration tower and is used for recovering and utilizing the regenerant subjected to regeneration treatment.
Furthermore, the extractant regenerating unit also comprises an extractant buffer tank, one end of the extractant buffer tank is respectively connected with the light liquid outlets of the first-stage extraction tower and the second-stage extraction tower, and the other end of the extractant buffer tank is connected with the extractant regenerating tower, so that the extractant mixed with the waste liquid flowing out of the light liquid outlet is separated.
Further, the extraction agent regeneration device also comprises a mother liquor tank which is connected with the extraction agent regeneration tower and supplies the regeneration agent to the extraction agent regeneration tower.
Furthermore, a heating element is arranged in the mother liquor tank.
Further, the heating temperature of the regenerant in the mother liquor tank is 50-70 ℃.
Furthermore, the recovery device comprises a crystallization tank connected with the extractant regeneration tower and a centrifugal separator connected with the crystallization tank, wherein the centrifugal separator is connected with the mother liquor tank and conveys the regenerant after centrifugal separation to the mother liquor tank for reuse.
Further, the filler is a pall ring, a raschig ring or an intalox saddle ring.
Furthermore, the volume ratio of the regenerant to the extractant in the extractant regeneration tower is 1-2: 1.
It can be known from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are: the extraction device, the extractant regeneration device and the recovery device are arranged, so that the extractant and the regeneration agent can be recycled while the nitrate nitrogen wastewater is treated, the treatment cost is reduced, and the wastewater recycling treatment is realized; the extraction device comprises a first-stage extraction tower and a second-stage extraction tower which are sequentially connected, and is used for carrying out second-stage extraction on the wastewater and carrying out multiple adsorption on the nitrate nitrogen wastewater so as to enable the wastewater to reach the discharge standard.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of an extraction apparatus;
in the figure, 1-a first-stage extraction tower, 2-a second-stage extraction tower, 3-an extractant buffer tank, 4-an extractant regeneration tower, 5-an extractant supplement tank, 6-a mother liquor tank, 7-a crystallization tank, 8-a centrifugal separator, 11-a tower body, 12-a filler, 13-a heavy liquid inlet, 14-a light liquid inlet, 15-a heavy liquid outlet and 16-a light liquid outlet.
Detailed Description
The present invention will be further described with reference to the following detailed description.
Referring to fig. 1 to 2, the equipment for treating the high-salt high-concentration nitrate nitrogen wastewater comprises an extraction device, an extractant regeneration device and a recovery device, wherein the initial content of nitrate nitrogen in the high-salt high-concentration nitrate nitrogen wastewater is more than 1000 mg/L.
The extraction device comprises a first-stage extraction tower 1 and a second-stage extraction tower 2 which are sequentially connected, wherein the first-stage extraction tower 1 comprises a tower body 11, a filler 12 arranged in the tower body 11, a heavy liquid inlet 13 arranged on the tower body 11 and used for wastewater to enter, a light liquid inlet 14 arranged on the tower body 11 and positioned below the heavy liquid inlet 13 and used for an extractant to enter, a heavy liquid outlet 15 arranged at the bottom of the tower body 11 and a light liquid outlet 16 arranged at the top of the tower body 11; the structure of the second-stage extraction tower 2 is the same as that of the first-stage extraction tower 1, a heavy liquid inlet of the second-stage extraction tower 2 is connected with a heavy liquid outlet 15 of the first-stage extraction tower 1, and nitrate nitrogen wastewater is adsorbed for multiple times through the first-stage extraction tower 1 and the second-stage extraction tower 2 which are connected in sequence, so that the wastewater reaches the discharge standard; specifically, the filler 12 is a pall ring, a Raschig ring or a rectangular saddle ring, and further, the volume ratio of the wastewater to the extracting agent in the first-stage extraction tower 1 and the second-stage extraction tower 2 is 3-6: 1.
An extractant regenerating device for regenerating an extractant comprises an extractant buffer tank 3, an extractant regenerating tower 4, an extractant replenishing tank 5 and a mother liquor tank 6, wherein one end of the extractant buffer tank 3 is respectively connected with a light liquor outlet 16 of a first-stage extraction tower 1 and a second-stage extraction tower 2, the other end of the extractant buffer tank is connected with the extractant regenerating tower 4, the extractant mixed with waste liquor flowing out of the light liquor outlet 16 is subjected to standing separation treatment, the extractant and the waste water are separated to the maximum extent, the subsequent work of the extractant regenerating tower 4 is ensured, specifically, the extractant used in the application is one of tertiary amine extractants, a diluent can be added into the extractant during use, the diluent can be one of kerosene, toluene and trichloromethane, and the addition amount of the diluent is 10-30% of the volume of the extractant.
The extractant regeneration tower 4 is used for regenerating the extractants from the first-stage extraction tower 1 and the second-stage extraction tower 2, and specifically, the temperature of the regeneration tower 4 is maintained at 60 ℃ in the working process of the extractant regeneration tower 4; further, the extractant regeneration tower is a common device in the field of extractant regeneration, and the specific structure and the working principle of the extractant regeneration tower are not further described.
One end of the extractant replenishing tank 5 is connected with the extractant regeneration tower 4, the other end is respectively connected with the light liquid inlets 14 of the first-stage extraction tower 1 and the second-stage extraction tower 2, and the extractant regenerated by the extractant regeneration tower 4 is sent into the first-stage extraction tower 1 or the second-stage extraction tower 2 again for recycling, so that the treatment cost is reduced, and the resource recycling is realized.
The mother liquor tank 6 is connected with the extractant regeneration tower 4, and supplies a regenerant to the extractant regeneration tower 4, wherein the regenerant adopts one or a mixed solution of sodium hydroxide and potassium hydroxide, specifically, a heating element is arranged in the mother liquor tank 6 to heat the regenerant entering the extractant regeneration tower 4, so that the temperature of the extractant entering the extractant regeneration tower 4 is kept at 50-70 ℃, and the heating element can be an electric heating wire or an electric heating rod or other elements capable of achieving the heating effect; furthermore, the volume ratio of the regenerant to the extractant in the extractant regeneration tower 4 is 1-2: 1.
The recovery device is connected with the extractant regeneration tower 4 and is used for recovering and utilizing the regenerant after regeneration treatment, and comprises a crystallization tank 7 connected with the extractant regeneration tower 4 and a centrifugal separator 8 connected with the crystallization tank 7, wherein the crystallization tank 7 is used for receiving the regenerant flowing out of the extractant regeneration tower 4 and cooling the regenerant to precipitate salt crystals in the regenerant and separate and convert pollutants into utilizable solid; the centrifugal separator 8 is connected with the mother liquor tank 6, and the regenerant after centrifugal separation is conveyed into the mother liquor tank 6 to be heated and reused; the crystallization tank 7 and the centrifugal separator 8 are arranged to recycle the regenerant, so that the treatment cost is reduced, and the resource recycling is realized.
When the device works, high-salt high-concentration nitrate nitrogen wastewater sequentially passes through a primary extraction tower 1 and a secondary extraction tower 2, so that nitrate nitrogen in the wastewater is absorbed by an extractant to reach a discharge standard; the extracted extractant enters an extractant regeneration tower 4 for regeneration treatment so as to recover the extractant and convey the extractant to the first-stage extraction tower 1 and the second-stage extraction tower 2 again for reuse; the regenerant after regeneration treatment is cooled and crystallized by the crystallizing tank 7, centrifugally separated by the centrifugal separator 8 and then conveyed to the mother liquor tank 6 again for reuse.
The extraction device, the extractant regeneration device and the recovery device are arranged, so that the extractant and the regeneration agent can be recycled while the nitrate nitrogen wastewater is treated, the treatment cost is reduced, and the wastewater recycling treatment is realized; the extraction device comprises a first-stage extraction tower 1 and a second-stage extraction tower 2 which are sequentially connected, and is used for extracting the wastewater twice and adsorbing the nitrate nitrogen wastewater twice so as to ensure that the wastewater reaches the discharge standard.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited thereby, and all equivalent changes and modifications made within the scope of the claims and the specification should be considered within the scope of the present invention.
Claims (6)
1. The utility model provides a treatment facility of high salt high concentration nitrate nitrogen waste water which characterized in that: comprises an extraction device, an extractant regeneration device and a recovery device;
the extraction device comprises a first-stage extraction tower and a second-stage extraction tower which are sequentially connected, wherein the first-stage extraction tower and the second-stage extraction tower have the same structure, and the first-stage extraction tower comprises a tower body, filler arranged in the tower body, a heavy liquid inlet arranged on the tower body and used for wastewater to enter, a light liquid inlet arranged on the tower body and positioned below the heavy liquid inlet and used for an extractant to enter, a heavy liquid outlet arranged at the bottom of the tower body and a light liquid outlet arranged at the top of the tower body; the heavy liquid inlet of the second-stage extraction tower is connected with the heavy liquid outlet of the first-stage extraction tower;
the extractant regeneration device comprises an extractant regeneration tower and an extractant supplement tank, wherein the extractant regeneration tower is used for regenerating the extractant from the light liquid outlets of the first-stage extraction tower and the second-stage extraction tower; one end of the extractant replenishing tank is connected with the extractant regeneration tower, the other end of the extractant replenishing tank is respectively connected with the light liquid inlets of the first-stage extraction tower and the second-stage extraction tower, and the extractant regenerated by the extractant regeneration tower is sent into the first-stage extraction tower or the second-stage extraction tower again;
and the recovery device is connected with the extractant regeneration tower and is used for recovering and utilizing the regenerant subjected to regeneration treatment.
2. The apparatus for treating high-salt high-concentration nitrate nitrogen wastewater according to claim 1, characterized in that: the extractant regenerating device also comprises an extractant buffer tank, one end of the extractant buffer tank is respectively connected with the light liquid outlets of the first-stage extraction tower and the second-stage extraction tower, and the other end of the extractant buffer tank is connected with the extractant regenerating tower, so that the extractant mixed with waste liquid flowing out of the light liquid outlet is separated.
3. The apparatus for treating high-salt high-concentration nitrate nitrogen wastewater according to claim 1, characterized in that: the extractant regenerating device also comprises a mother liquor tank which is connected with the extractant regenerating tower and supplies the regenerant to the extractant regenerating tower.
4. The apparatus for treating high-salt high-concentration nitrate nitrogen wastewater according to claim 3, characterized in that: and a heating element is arranged in the mother liquid tank.
5. The apparatus for treating high-salt high-concentration nitrate nitrogen wastewater according to claim 3, characterized in that: the recovery device comprises a crystallization tank connected with the extractant regeneration tower and a centrifugal separator connected with the crystallization tank, the centrifugal separator is connected with the mother liquor tank, and the regenerant after centrifugal separation is conveyed to the mother liquor tank for reuse.
6. The apparatus for treating high-salt high-concentration nitrate nitrogen wastewater according to claim 1, characterized in that: the filler is pall ring, raschig ring or intalox saddle ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121379546.4U CN215161168U (en) | 2021-06-21 | 2021-06-21 | Treatment facility of high salt high concentration nitrate nitrogen waste water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121379546.4U CN215161168U (en) | 2021-06-21 | 2021-06-21 | Treatment facility of high salt high concentration nitrate nitrogen waste water |
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| CN215161168U true CN215161168U (en) | 2021-12-14 |
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| CN202121379546.4U Active CN215161168U (en) | 2021-06-21 | 2021-06-21 | Treatment facility of high salt high concentration nitrate nitrogen waste water |
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