CN114804443A - Mine rare earth high ammonia nitrogen wastewater treatment process - Google Patents
Mine rare earth high ammonia nitrogen wastewater treatment process Download PDFInfo
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- CN114804443A CN114804443A CN202210636786.0A CN202210636786A CN114804443A CN 114804443 A CN114804443 A CN 114804443A CN 202210636786 A CN202210636786 A CN 202210636786A CN 114804443 A CN114804443 A CN 114804443A
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 25
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000008569 process Effects 0.000 title claims abstract description 21
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 59
- 239000012528 membrane Substances 0.000 claims abstract description 51
- 239000002351 wastewater Substances 0.000 claims abstract description 42
- 238000007872 degassing Methods 0.000 claims abstract description 27
- 238000004062 sedimentation Methods 0.000 claims abstract description 21
- 238000005189 flocculation Methods 0.000 claims abstract description 9
- 230000016615 flocculation Effects 0.000 claims abstract description 9
- 239000012141 concentrate Substances 0.000 claims abstract description 8
- 238000005352 clarification Methods 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 18
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 14
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 14
- 230000003311 flocculating effect Effects 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 8
- 230000001376 precipitating effect Effects 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- -1 ammonium ions Chemical class 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000000701 coagulant Substances 0.000 claims description 4
- 239000000084 colloidal system Substances 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 4
- 230000009615 deamination Effects 0.000 claims description 4
- 238000006481 deamination reaction Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000010790 dilution Methods 0.000 abstract 1
- 239000012895 dilution Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000011002 quantification Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
- C01C1/242—Preparation from ammonia and sulfuric acid or sulfur trioxide
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention provides a mine rare earth high ammonia nitrogen wastewater treatment process, which relates to the technical field of mine rare earth high ammonia nitrogen treatment, and comprises the following steps of S1: firstly, collecting high ammonia nitrogen wastewater flowing out of a mountain body, pumping the high ammonia nitrogen wastewater back to a raw water tank of a water treatment station, and naturally clarifying the high ammonia nitrogen wastewater in a settling pond through self-flowing; s2: the wastewater after natural clarification flows out of the sedimentation tank and enters a two-stage reverse osmosis membrane treatment system of a water treatment station; s3: one-level reverse osmosis, most COD in the waste water can be got rid of to first order reverse osmosis membrane treatment, ammonia nitrogen, SS, TP and salinity, then arrange the concentrate to the flocculation and precipitation pond, be used for mine ammonia nitrogen treatment for prior art, add degasification membrane circulation processing for value up to standard is higher, does not reach the ammonia nitrogen of emission then and continues the dilution, so circulation, and then the improvement is to the effect of getting rid of ammonia nitrogen.
Description
Technical Field
The invention relates to the technical field of mine rare earth high ammonia nitrogen treatment, in particular to a process for treating mine rare earth high ammonia nitrogen wastewater.
Background
Rare earth resources are one of important mineral resources in China, ion type rare earth ores are typical in the south of China, exist in a muddy soil layer in an ion state, the rapid development of the rare earth industry is strong, high ammonia nitrogen wastewater generated by the ion type rare earth ores also becomes one of industrial development restriction factors, excessive ammonia can cause serious environmental pollution, the original process does not use degassing membrane process steps, most of blowing-off modes are used, no adsorption is generated, the environmental pollution is easily caused, and resin adsorption is adopted, the cost is high, the regeneration period is long, and the ecological pollution is caused.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a process for treating rare earth high ammonia nitrogen wastewater in a mine.
In order to achieve the purpose, the invention adopts the following technical scheme: a treatment process of mine rare earth high ammonia nitrogen wastewater comprises the following steps:
s1: firstly, collecting high ammonia nitrogen wastewater flowing out of a mountain body, pumping the high ammonia nitrogen wastewater back to a raw water tank of a water treatment station, and naturally clarifying the high ammonia nitrogen wastewater in a settling pond through self-flowing;
s2: the wastewater after natural clarification flows out of the sedimentation tank and enters a two-stage reverse osmosis membrane treatment system of a water treatment station;
s3: the first-stage reverse osmosis, wherein most of COD, ammonia nitrogen, SS, TP and salt in the wastewater can be removed through the first-stage reverse osmosis membrane treatment, and then the concentrated solution is discharged to a flocculation sedimentation tank;
s4: secondary reverse osmosis, wherein the secondary reverse osmosis membrane treatment further removes residual salt and various ions in the wastewater so as to ensure that the produced water of the system reaches the standard, and the water reaching the standard enters a water producing pool;
s5: flocculating and precipitating, namely adding coagulant aid into water in a flocculating and precipitating tank to ensure that particles which are difficult to precipitate in the water can be mutually polymerized to form colloid, and then are combined with impurities in the water body to form a larger flocculating constituent;
s6: the water after flocculation reaction enters a degassing membrane system for deamination treatment, wherein a small amount of concentrated sulfuric acid is added, sulfate ions adsorb ammonium ions to combine into liquid ammonium sulfate, and the liquid ammonium sulfate is subjected to external treatment after solidification;
s7: and the produced water after the deaminizing treatment of the degassing membrane and the produced water after the treatment of the two stages of reverse osmosis membranes simultaneously enter the water producing tank and are discharged after reaching the standard.
In order to further remove high ammonia nitrogen, the invention improves that in step S4, the secondary reverse osmosis automatically returns the concentrated solution in the system to the primary reverse osmosis membrane treatment system.
In order to reduce the pH value of the waste water, the invention improves that the pH value of the waste water in the sedimentation tank can be reduced to be below 4 by adding sulfuric acid into the sedimentation tank in the step S2.
In order to remove the mineral content, the invention improves that in the S3 step, the mineral content in the first-stage reverse osmosis is generally 0.7, and the mineral content is concentrated by 2 to 3 times, and can be removed by 1.4 to 1.5.
In order to increase the concentration multiple, the invention improves that in the step S3, the concentration multiple is 1.5-2.5 times.
In order to provide a reference value, the invention improves that in the step S3, the reference value of the content of ammonia nitrogen is the conductivity.
In order to improve the removal rate of high ammonia nitrogen, the invention has the improvement that in the step S3, the conductivity is 6623, the conductivity of the residual water is 753, the removal rate of the first-stage reverse osmosis can reach 88% -90%, and the removal rate of the second-stage reverse osmosis can reach 98% -99%.
In order to improve the removal rate of the degassing membrane, the invention improves that in the step S6, the removal rate of the degassing membrane can reach 74% by adopting a concentration ratio of 800x1.85, the conductivity is 1480.
Compared with the prior art, the invention has the advantages and positive effects that,
according to the invention, water pumped back from a raw mine enters a primary reverse osmosis system, concentrated water is taken out to be prepared into ores, then enters a degassing membrane, the water in the degassing membrane continuously goes downwards, the mines are recycled and prepared into ores, and can be concentrated continuously, concentrated sulfuric acid is added into the degassing membrane by using the degassing membrane to prepare ammonium sulfate, the ammonium sulfate becomes solid or liquid ammonium sulfate after being adsorbed by the degassing membrane, the concentrated water returns to the primary level in the secondary level, and the concentrated water is discharged after reaching the secondary level.
Drawings
FIG. 1 is a process flow chart of the treatment process of the mine rare earth high ammonia nitrogen wastewater provided by the invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.
Example one
Referring to fig. 1, the present invention provides a technical solution: a treatment process of mine rare earth high ammonia nitrogen wastewater comprises the following steps:
s1: firstly, collecting high ammonia nitrogen wastewater flowing out of a mountain body, pumping the high ammonia nitrogen wastewater back to a raw water tank of a water treatment station, and naturally clarifying the high ammonia nitrogen wastewater in a settling pond through self-flowing;
s2: the wastewater after natural clarification flows out of the sedimentation tank and enters a two-stage reverse osmosis membrane treatment system of a water treatment station;
s3: the first-stage reverse osmosis, wherein most of COD, ammonia nitrogen, SS, TP and salt in the wastewater can be removed through the first-stage reverse osmosis membrane treatment, and then the concentrated solution is discharged to a flocculation sedimentation tank;
s4: secondary reverse osmosis, wherein the secondary reverse osmosis membrane treatment further removes residual salt and various ions in the wastewater so as to ensure that the produced water of the system reaches the standard, and the water reaching the standard enters a water producing pool;
s5: flocculating and precipitating, namely adding coagulant aid into water in a flocculating and precipitating tank to ensure that particles which are difficult to precipitate in the water can be mutually polymerized to form colloid, and then are combined with impurities in the water body to form a larger flocculating constituent;
s6: the water after flocculation reaction enters a degassing membrane system for deamination treatment, wherein a small amount of concentrated sulfuric acid is added, sulfate ions adsorb ammonium ions to combine into liquid ammonium sulfate, and the liquid ammonium sulfate is subjected to external treatment after solidification;
s7: and the produced water after the deaminizing treatment of the degassing membrane and the produced water after the treatment of the two stages of reverse osmosis membranes simultaneously enter the water producing tank and are discharged after reaching the standard.
In step S4, the second-stage reverse osmosis automatically returns the concentrate in the system to the first-stage reverse osmosis membrane treatment system, and returns the concentrate in the second-stage reverse osmosis system to the first-stage reverse osmosis membrane treatment system again, so as to further dilute the ammonia nitrogen in the concentrate, and the process is repeated.
In the step S2, sulfuric acid is added into the sedimentation tank, the pH value of wastewater in the sedimentation tank can be reduced to be below 4, southern rare earth is in a free ion shape, unlike a northern mud shape, thousands of water pipes are arranged in a mountain body to soak the mountain body, collected water is subjected to precipitation and impurity removal, sulfuric acid is added to reduce the pH value to be below 4, powder can be formed, the ammonia nitrogen content of the mountain body of the mine is 800-1000, and the sedimentation tank is used for removing impurities and preventing primary reverse osmosis blockage.
In the step S3, the content of ore in the first-stage reverse osmosis is generally 0.7, the ore is concentrated to 2 times and can be removed by 1.4, the concentrated ore is removed to be used as ore, the ore is prepared in a sedimentation tank before full quantification, the ore is prepared through the first-stage reverse osmosis at different positions, the concentration ratio of high ammonia nitrogen is higher than that of the full quantification when the high ammonia nitrogen is prepared in the first stage, and the ore is extracted after the second-stage reverse osmosis is concentrated.
In step S3, the concentration factor is 1.5 to 2.5, for example, 100 tons of water is fed, the clear solution is 75, the concentrated solution is 25, and the ratio is 3: 1.
in the step S3, the reference value of the content of ammonia nitrogen is the conductivity, the higher the conductivity is, the more pollutants are, the conductivity in the concentrated solution is 8000 to 24000, the clear water is discharged, the rest is accumulated in the concentrated solution, and the ammonia nitrogen is increased in proportion.
In the step S3, the conductivity is 6623, the conductivity of the residual water is 753, the removal rate of the first-stage reverse osmosis can reach 88% -90%, and the removal rate of the second-stage reverse osmosis can reach 98% -99%.
In the step S6, a concentration ratio of 800x1.85 times is adopted, the conductivity is 1480, the removal rate of the degassing membrane can reach 74%, 800-.
Example two
Referring to fig. 1, the present invention provides a technical solution: a treatment process of mine rare earth high ammonia nitrogen wastewater comprises the following steps:
s1: firstly, collecting high ammonia nitrogen wastewater flowing out of a mountain body, pumping the high ammonia nitrogen wastewater back to a raw water tank of a water treatment station, and naturally clarifying the high ammonia nitrogen wastewater in a settling pond through self-flowing;
s2: the wastewater after natural clarification flows out of the sedimentation tank and enters a two-stage reverse osmosis membrane treatment system of a water treatment station;
s3: the first-stage reverse osmosis, wherein most of COD, ammonia nitrogen, SS, TP and salt in the wastewater can be removed through the first-stage reverse osmosis membrane treatment, and then the concentrated solution is discharged to a flocculation sedimentation tank;
s4: secondary reverse osmosis, wherein the secondary reverse osmosis membrane treatment further removes residual salt and various ions in the wastewater so as to ensure that the produced water of the system reaches the standard, and the water reaching the standard enters a water producing pool;
s5: flocculating and precipitating, namely adding coagulant aid into water in a flocculating and precipitating tank to ensure that particles which are difficult to precipitate in the water can be mutually polymerized to form colloid, and then are combined with impurities in the water body to form a larger flocculating constituent;
s6: the water after flocculation reaction enters a degassing membrane system for deamination treatment, wherein a small amount of concentrated sulfuric acid is added, sulfate ions adsorb ammonium ions to combine into liquid ammonium sulfate, and the liquid ammonium sulfate is subjected to external treatment after solidification;
s7: and the produced water after the deaminizing treatment of the degassing membrane and the produced water after the treatment of the two stages of reverse osmosis membranes simultaneously enter the water producing tank and are discharged after reaching the standard.
In step S4, the second-stage reverse osmosis automatically returns the concentrate in the system to the first-stage reverse osmosis membrane treatment system, and returns the concentrate in the second-stage reverse osmosis system to the first-stage reverse osmosis membrane treatment system again, so as to further dilute the ammonia nitrogen in the concentrate, and the process is repeated.
In the step S2, sulfuric acid is added into the sedimentation tank, the pH value of wastewater in the sedimentation tank can be reduced to be below 4, southern rare earth is in a free ion shape, unlike a northern mud shape, thousands of water pipes are arranged in a mountain body to soak the mountain body, collected water is subjected to precipitation and impurity removal, sulfuric acid is added to reduce the pH value to be below 4, powder can be formed, the ammonia nitrogen content of the mountain body of the mine is 800-1000, and the sedimentation tank is used for removing impurities and preventing primary reverse osmosis blockage.
In the step S3, the content of ore in the first-stage reverse osmosis is generally 0.7, the ore is concentrated to 3 times and can be removed by 1.5, the concentrated ore is removed to be used as ore, the ore is prepared in a sedimentation tank before full quantification, the ore is prepared through the first-stage reverse osmosis at different positions, the concentration ratio of high ammonia nitrogen is higher than that of the full quantification when the high ammonia nitrogen is prepared in the first stage, and the ore is extracted after the second-stage reverse osmosis is concentrated.
In step S3, the concentration factor is 1.5 to 2.5, for example, 100 tons of water is fed, the clear solution is 75, the concentrated solution is 25, and the ratio is 3: 1.
in the step S3, the reference value of the content of ammonia nitrogen is the conductivity, the higher the conductivity is, the more pollutants are, the conductivity in the concentrated solution is 8000 to 24000, the clear water is discharged, the rest is accumulated in the concentrated solution, and the ammonia nitrogen is increased in proportion.
In the step S3, the conductivity is 6623, the conductivity of the residual water is 753, the removal rate of the first-stage reverse osmosis can reach 88% -90%, and the removal rate of the second-stage reverse osmosis can reach 98% -99%.
In the step S6, adopting a concentration ratio of 800x1.85 times, the conductivity of 1480, obtaining 74% ammonia nitrogen through a degassing membrane x 95%, the removal rate of the degassing membrane can reach 74%, and 800 plus 1000 ammonia nitrogen exists on a mine, and continuously diluting mountain ammonia nitrogen by using water and the degassing membrane until reaching the ammonia nitrogen discharge standard.
According to the invention, water pumped back from a raw mine enters a primary reverse osmosis system, concentrated water is taken out to be prepared into ores, then enters a degassing membrane, the water in the degassing membrane continuously goes downwards, the mines are recycled and prepared into ores, and can be concentrated continuously, concentrated sulfuric acid is added into the degassing membrane by using the degassing membrane to prepare ammonium sulfate, the ammonium sulfate becomes solid or liquid ammonium sulfate after being adsorbed by the degassing membrane, the concentrated water returns to the primary level in the secondary level, and the concentrated water is discharged after reaching the secondary level.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (8)
1. A treatment process of mine rare earth high ammonia nitrogen wastewater is characterized by comprising the following steps:
s1: firstly, collecting high ammonia nitrogen wastewater flowing out of a mountain body, pumping the high ammonia nitrogen wastewater back to a raw water tank of a water treatment station, and naturally clarifying the high ammonia nitrogen wastewater in a settling pond through self-flowing;
s2: the wastewater after natural clarification flows out of the sedimentation tank and enters a two-stage reverse osmosis membrane treatment system of a water treatment station;
s3: the first-stage reverse osmosis, wherein most of COD, ammonia nitrogen, SS, TP and salt in the wastewater can be removed through the first-stage reverse osmosis membrane treatment, and then the concentrated solution is discharged to a flocculation sedimentation tank;
s4: secondary reverse osmosis, wherein the secondary reverse osmosis membrane treatment further removes residual salt and various ions in the wastewater so as to ensure that the produced water of the system reaches the standard, and the water reaching the standard enters a water producing pool;
s5: flocculating and precipitating, namely adding coagulant aid into water in a flocculating and precipitating tank to ensure that particles which are difficult to precipitate in the water can be mutually polymerized to form colloid, and then are combined with impurities in the water body to form a larger flocculating constituent;
s6: the water after flocculation reaction enters a degassing membrane system for deamination treatment, wherein a small amount of concentrated sulfuric acid is added, sulfate ions adsorb ammonium ions to combine into liquid ammonium sulfate, and the liquid ammonium sulfate is subjected to external treatment after solidification;
s7: and the produced water after the deaminizing treatment of the degassing membrane and the produced water after the treatment of the two stages of reverse osmosis membranes simultaneously enter the water producing tank and are discharged after reaching the standard.
2. The mine rare earth high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: in step S4, the secondary reverse osmosis automatically returns the concentrate in its system to the primary reverse osmosis membrane treatment system.
3. The mine rare earth high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: in step S2, sulfuric acid is added to the sedimentation tank to reduce the ph of the wastewater in the sedimentation tank to 4 or less.
4. The mine rare earth high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: in step S3, the mineral content in the first stage reverse osmosis is typically 0.7, concentrated 2 to 3 times, and 1.4-1.5 removed.
5. The mine rare earth high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: in the step S3, the concentration factor is 1.5 to 2.5 times.
6. The mine rare earth high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: in the step S3, the reference value of the content of ammonia nitrogen is the conductivity.
7. The mine rare earth high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: in the step S3, the conductivity is 6623, the conductivity of the residual water is 753, the removal rate of the first-stage reverse osmosis can reach 88% -90%, and the removal rate of the second-stage reverse osmosis can reach 98% -99%.
8. The mine rare earth high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: in the step of S6, the removal rate of the degassing membrane can reach 74% by adopting a concentration ratio of 800x1.85 times and a conductivity of 1480.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115417535A (en) * | 2022-11-07 | 2022-12-02 | 矿冶科技集团有限公司 | Method for enriching and recycling leaching tail water of ionic rare earth mine ammonium salt leaching field |
| CN115417535B (en) * | 2022-11-07 | 2023-01-31 | 矿冶科技集团有限公司 | Method for enriching and recycling leaching tail water of ionic rare earth mine ammonium salt leaching field |
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