CN217323512U - Treatment system for removing heavy metal impurities from ammonia nitrogen wastewater and ammonium sulfate solution - Google Patents
Treatment system for removing heavy metal impurities from ammonia nitrogen wastewater and ammonium sulfate solution Download PDFInfo
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- CN217323512U CN217323512U CN202220835169.9U CN202220835169U CN217323512U CN 217323512 U CN217323512 U CN 217323512U CN 202220835169 U CN202220835169 U CN 202220835169U CN 217323512 U CN217323512 U CN 217323512U
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Abstract
The utility model relates to a processing system that ammonia nitrogen waste water and ammonium sulfate solution removed heavy metal impurity, including end launder, the ammonia nitrogen waste water blowdown termination of spray column and one-level dynamic wave desulfurizing tower to end launder, mother liquor groove and the ammonium sulfate cistern contain arsenic ammonium sulfate liquid blowdown termination to end launder, set up bivalent molysite import on the end launder, PH regulation mouth, aeration import, the filter-pressing liquid feeding pump is established to the underflow groove liquid end, and filter-pressing liquid feeding pump goes out liquid termination to pressure filter, and the export of pressure filter filtrating connects to second grade dynamic wave desulfurizing tower. The utility model discloses can concentrate the collection with spray column and one-level dynamic wave desulfurizing tower blowdown gained high concentration ammonia nitrogen waste water and mother liquor tank underflow and the gained high concentration of thiamine tank underflow blowdown contains arsenic ammonium sulfate solution, introduce bivalent molysite simultaneously and combine aeration and PH to adjust, effectively precipitate arsenic and other heavy metal ions in the waste water and separate out, possess ammonia nitrogen waste water zero release, do not introduce other impurity element, reduce the ammonium sulfate and contain heavy metal such as arsenic, characteristics such as easily operation.
Description
Technical Field
The utility model relates to a chemical industry waste water treatment technical field, concretely relates to ammonia nitrogen waste water and ammonium sulfate solution remove heavy metal impurity's processing system.
Background
Smelting enterprises adopt an ammonia-acid method to desulfurize low-concentration SO2 smelting flue gas, and a byproduct is ammonium sulfate. In the pyrometallurgical process, slag, pulverized coal and oxygen react at high temperature to generate flue gas containing nitric oxide, trace heavy metals SO2 such as arsenic, cadmium, lead, mercury and the like, when the flue gas is washed by a tail gas desulfurization spray tower, the trace heavy metals such as nitric oxide, arsenic, cadmium, lead, mercury and the like are dissolved in a washing liquid to form a high-concentration ammonia nitrogen wastewater solution containing the trace heavy metals, and the solution is periodically discharged and production water is supplemented to ensure the cooling and dedusting effects of the spray tower. The ammonia nitrogen wastewater contains more arsenic and heavy metal impurities, is usually discharged to a sewage treatment section to purify and neutralize the pH value by adding acid and alkali, has high treatment cost and is not beneficial to controlling the production cost of smelting enterprises; meanwhile, an ammonia-acid-method desulfurization ammonium fixation system is free of impurities and is open, heavy metals such as arsenic in an ammonium sulfate solution can be recycled along with the solution and are enriched in a byproduct ammonium sulfate, and the analysis result of a small part of solid ammonium sulfate cannot reach the quality standard of national standard GB/T535-2020 fertilizer grade I type ammonium sulfate.
Therefore, in order to reduce the treatment cost of the tail gas desulfurization wastewater of smelting enterprises, improve the quality of ammonium sulfate products and realize the recycling of ammonia nitrogen wastewater after purification, a wastewater treatment system meeting the requirements is urgently needed to be designed.
Disclosure of Invention
To the problem that exists in the background art, the utility model provides an ammonia nitrogen waste water and ammonium sulfate solution remove heavy metal impurity's processing system possesses ammonia nitrogen waste water zero release, does not introduce other impurity element, reduces that the ammonium sulfate contains characteristics such as heavy metal such as arsenic, easily operation.
In order to achieve the above purpose, the utility model adopts the following technical scheme: ammonia nitrogen waste water and ammonium sulfate solution heavy metal impurity's processing system that removes includes the spray column, one-level dynamic wave desulfurizing tower, second grade dynamic wave desulfurizing tower, mother liquor groove and thiamine cistern, one-level dynamic wave desulfurizing tower blowdown connects to the mother liquor groove, mother liquor groove liquid outlet connects to the thiamine cistern, still include end sluice, the ammonia nitrogen waste water blowdown termination of spray column and one-level dynamic wave desulfurizing tower is to end sluice, the arsenious thiamine liquid blowdown termination of mother liquor groove and thiamine cistern is to end sluice, set up the bivalent molysite import on the end sluice, the PH regulation mouth, the aeration import, the filter-pressing liquid feeding pump is established to underflow groove liquid outlet end, filter-pressing liquid feeding pump liquid outlet termination is to the pressure filter, filter-pressing filtrate outlet connects to second grade dynamic wave desulfurizing tower.
Preferably, the aeration inlet is connected with an air pressure source at the outer side.
Preferably, an agitator is provided in the underflow tank.
Preferably, the filter press is a manual-automatic integrated box filter press.
The utility model has the advantages that:
the utility model discloses can concentrate the collection with spray column and one-level dynamic wave desulfurizing tower blowdown gained high concentration ammonia nitrogen waste water and mother liquor tank underflow and the gained high concentration of thiamine tank underflow blowdown contains arsenic ammonium sulfate solution, introduce bivalent molysite simultaneously and combine aeration and PH to adjust, effectively precipitate arsenic and other heavy metal ions in the waste water and separate out, possess ammonia nitrogen waste water zero release, do not introduce other impurity element, reduce the ammonium sulfate and contain heavy metal such as arsenic, characteristics such as easily operation.
Drawings
Fig. 1 is a schematic view of the present invention.
In the figure, a 1-spray tower, a 2-first-stage dynamic wave desulfurization tower, a 3-second-stage dynamic wave desulfurization tower, a 4-mother liquid tank, a 5-ammonium sulfate liquid tank, a 6-bottom flow tank, a 7-ferrous salt inlet, an 8-PH adjusting port, a 9-aeration inlet, a 10-filter pressing liquid feeding pump and an 11-filter press are arranged.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following will explain in detail a preferred embodiment of the present invention with reference to the accompanying drawings to facilitate understanding of the skilled person.
Referring to fig. 1, the system for removing heavy metal impurities from ammonia nitrogen wastewater and ammonium sulfate solution comprises a spray tower 1, a primary dynamic wave desulfurization tower 2, a secondary dynamic wave desulfurization tower 3, a mother liquor tank 4 and an ammonium sulfate liquor tank 5, wherein the primary dynamic wave desulfurization tower 2 discharges sewage and is connected to the mother liquor tank 4, a liquor outlet of the mother liquor tank 4 is connected to the ammonium sulfate liquor tank 5, the system further comprises a bottom liquor tank 6, the ammonia nitrogen wastewater discharge end of the spray tower 1 and the primary dynamic wave desulfurization tower 2 is connected to the bottom liquor tank 6, the arsenic-containing ammonium sulfate liquor discharge end of the mother liquor tank 4 and the ammonium sulfate liquor tank 5 is connected to the bottom liquor tank 6, the bottom liquor tank 6 is provided with a ferrous salt inlet 7, a PH adjusting port 8 and an aeration inlet 9, the liquor outlet end of the bottom liquor tank 6 is connected to a filter press liquid feeding pump 10 through a pipeline, the liquor outlet of the filter press liquid feeding pump 10 is connected to a filter press filter 11, and a filtrate outlet of the filter press 11 is connected to the secondary dynamic wave desulfurization tower 3 through a pipeline.
In the working process, ammonia nitrogen wastewater obtained by blowdown of the spray tower 1 and the primary dynamic wave desulfurization tower 2 and high-concentration arsenic-containing ammonium sulfate liquid obtained by underflow blowdown of the mother liquid tank 4 and the ammonium sulfate liquid tank 5 are both sent to the underflow tank 6, ferrous sulfate is introduced through the ferrous salt inlet 7, ammonia water is added through the pH adjusting port 8 to adjust the pH value, the aeration inlet 9 is connected with an air pressure source on the outer side, and compressed air is introduced to realize aeration. Namely, ferrous sulfate is adopted as an arsenic removal agent. Under the action of aeration, arsenic and other heavy metal impurity metal ions are partially or adsorbed in the ferric hydroxide polymer to precipitate in the process of oxidizing ferrous iron into ferric iron, and part of the ions are separated out in the form of hydroxide. After the bottom flow groove 6 is fully reacted, a filter-pressing liquid feeding pump 10 is started, and the solution is sent to a filter press 11. Filtrate produced by the filter press 11 flows back to the second-level dynamic wave desulfurizing tower 3 for treating the flue gas again, filter residues are periodically discharged by the filter press 11, and the filter residues are returned to a residue storage for centralized treatment. Thereby recycling the ammonia nitrogen wastewater, achieving zero emission, and effectively reacting heavy metals such as arsenic and the like in the ammonium sulfate solution in the solution to form impurity precipitates to be removed by filter pressing and purification. Wherein, the underflow groove 6 is internally provided with a stirrer which can accelerate the chemical reaction among the impurities, oxygen and ferrous sulfate in the solution. The filter press 11 is a manual-automatic integrated box-type filter press, and has a large filtering area, and is simple and easy to operate.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (4)
1. The utility model provides an ammonia nitrogen waste water and ammonium sulfate solution remove heavy metal impurity's processing system, includes spray column (1), one-level dynamic wave desulfurizing tower (2), second grade dynamic wave desulfurizing tower (3), mother liquid groove (4) and thiamine cistern (5), and one-level dynamic wave desulfurizing tower (2) blowdown connects to mother liquid groove (4), and mother liquid groove (4) liquid outlet connects to thiamine cistern (5), its characterized in that: the device is characterized by further comprising a bottom flow groove (6), the ammonia nitrogen wastewater sewage discharge end of the spray tower (1) and the primary dynamic wave desulfurization tower (2) is connected to the bottom flow groove (6), the arsenic-containing ammonium sulfate liquid sewage discharge end of the mother liquid groove (4) and the ammonium sulfate liquid groove (5) is connected to the bottom flow groove (6), a ferrous salt inlet (7), a PH adjusting port (8) and an aeration inlet (9) are arranged on the bottom flow groove (6), a filter pressing liquid feeding pump (10) is arranged at the liquid outlet end of the bottom flow groove (6), the liquid outlet end of the filter pressing liquid feeding pump (10) is connected to a filter press (11), and the filtrate outlet end of the filter press (11) is connected to the secondary dynamic wave desulfurization tower (3).
2. The system for removing heavy metal impurities in ammonia nitrogen wastewater and ammonium sulfate solution as claimed in claim 1, wherein: the aeration inlet (9) is connected with an air pressure source at the outer side.
3. The system for removing heavy metal impurities in ammonia nitrogen wastewater and ammonium sulfate solution as claimed in claim 1, wherein: a stirrer is arranged in the bottom launder (6).
4. The system for removing heavy metal impurities in ammonia nitrogen wastewater and ammonium sulfate solution as claimed in claim 1, wherein: the filter press (11) is a manual-automatic integrated box-type filter press.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220835169.9U CN217323512U (en) | 2022-04-12 | 2022-04-12 | Treatment system for removing heavy metal impurities from ammonia nitrogen wastewater and ammonium sulfate solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220835169.9U CN217323512U (en) | 2022-04-12 | 2022-04-12 | Treatment system for removing heavy metal impurities from ammonia nitrogen wastewater and ammonium sulfate solution |
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| CN217323512U true CN217323512U (en) | 2022-08-30 |
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| CN202220835169.9U Active CN217323512U (en) | 2022-04-12 | 2022-04-12 | Treatment system for removing heavy metal impurities from ammonia nitrogen wastewater and ammonium sulfate solution |
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