CN114751514A - Method for treating rare earth tail water based on anaerobic ammonia oxidation embedded bioactive filler - Google Patents
Method for treating rare earth tail water based on anaerobic ammonia oxidation embedded bioactive filler Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 136
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 69
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 68
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 63
- 239000000945 filler Substances 0.000 title claims abstract description 62
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 57
- 230000000975 bioactive effect Effects 0.000 title claims abstract description 56
- 230000003647 oxidation Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000007034 nitrosation reaction Methods 0.000 claims abstract description 87
- 230000009935 nitrosation Effects 0.000 claims abstract description 86
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 50
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 25
- 239000010802 sludge Substances 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 14
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims description 53
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 32
- 239000003513 alkali Substances 0.000 claims description 24
- 241000894006 Bacteria Species 0.000 claims description 17
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 16
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 16
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 13
- 235000017281 sodium acetate Nutrition 0.000 claims description 13
- 239000001632 sodium acetate Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 9
- 238000004062 sedimentation Methods 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 7
- 241001453382 Nitrosomonadales Species 0.000 claims description 6
- 239000011162 core material Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 5
- XHFLOLLMZOTPSM-UHFFFAOYSA-M sodium;hydrogen carbonate;hydrate Chemical compound [OH-].[Na+].OC(O)=O XHFLOLLMZOTPSM-UHFFFAOYSA-M 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910001424 calcium ion Inorganic materials 0.000 claims description 3
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 3
- 238000006396 nitration reaction Methods 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000003203 everyday effect Effects 0.000 claims description 2
- 239000006228 supernatant Substances 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 abstract description 3
- 239000010865 sewage Substances 0.000 abstract description 2
- 238000005273 aeration Methods 0.000 abstract 1
- 238000010992 reflux Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000003651 drinking water Substances 0.000 description 3
- 235000020188 drinking water Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 230000004071 biological effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011197 physicochemical method Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910001437 manganese ion Inorganic materials 0.000 description 1
- 208000005135 methemoglobinemia Diseases 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- XKLJHFLUAHKGGU-UHFFFAOYSA-N nitrous amide Chemical compound ON=N XKLJHFLUAHKGGU-UHFFFAOYSA-N 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- 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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- 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
- C02F2301/04—Flow arrangements
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
A method for treating rare earth tail water based on anaerobic ammonia oxidation embedded bioactive filler belongs to the technical field of biological denitrification treatment of sewage and wastewater. Firstly, rare earth tail water enters a partial nitrosation pool, DO is regulated and controlled according to water inlet conditions, and 56.9% of ammonia nitrogen in the inlet water is oxidized into nitrite nitrogen. And then the effluent enters an anaerobic ammonia oxidation reaction tank, and the anaerobic ammonia oxidation embedded bioactive filler utilizes nitrite nitrogen and residual ammonia nitrogen to generate nitrogen and nitrate nitrogen. In a denitrification tank, the anaerobic ammonia oxidation embedded bioactive filler removes the original nitrate nitrogen in the rare earth tail water and the nitrate nitrogen generated by the anaerobic ammonia oxidation reaction by using the added organic carbon source. The aeration quantity can be saved in a part of nitrosation stages, sludge reflux equipment is not needed, and a large amount of organic carbon sources can be saved in an anaerobic ammonia oxidation stage. The method can realize the high-efficiency denitrification of the rare earth tail water and greatly reduce the denitrification treatment cost.
Description
Technical Field
The invention belongs to the technical field of biological denitrification treatment of sewage and wastewater, and particularly relates to a method for treating rare earth tail water based on anaerobic ammonia oxidation embedded bioactive filler, which is suitable for removing ammonia nitrogen and total nitrogen of rare earth tail water with ammonia nitrogen concentration of more than 70mg/L and low COD.
Background
China is one of the most abundant countries in rare earth resources in the world, and the south of the distribution is mainly heavy rare earth, and the north of the distribution is mainly light rare earth. The south rare earth deposit is of a weathered shell type, is rich in yttrium, dysprosium, terbium and other medium and heavy rare earth elements necessary for modern high technology, national defense and other advanced fields, and is a dominant mineral resource and a strategic resource in China. Jiangxi Ganzhou has rich rare earth resources and is entitled "rare earth kingdom".
With the gradual expansion of rare earth industry in China, the pollution problem is also becoming more serious. After a plurality of rare earth mining areas are mined, a large amount of ammonium salt and rare earth elements are remained, enter nearby rivers or lakes along with the scouring action of rainwater, and seriously affect the surrounding environment and the health of people. Nitrite and nitrate which are products of nitrification of ammonia nitrogen in water body are harmful to drinking water, drinking water with high nitrite and nitrate concentration may cause two health hazards to human body, and long-term drinking of the drinking water is extremely unfavorable to human body, namely, methemoglobinemia is induced and carcinogenic nitrosamine is generated. Crops can only grow high and crazy without ear formation in the rare earth tail water environment containing ammonia nitrogen, thereby reducing the yield. Algae in rivers breed massively by using ammonia nitrogen in rare earth tail water, so that DO concentration in the rivers is reduced, and finally, a large amount of river organisms die.
At present, the treatment of rare earth tail water is mainly divided into a physicochemical method and a biological treatment method, wherein the physicochemical method has a certain treatment effect but is expensive, and the biological treatment method has low treatment cost and no secondary pollution, and is widely used for treating various waste water. The biological treatment method mainly adopts the traditional nitrification and denitrification denitrogenation process, and belongs to the whole course nitrification and denitrification biological removal technology. The traditional nitrification and denitrification technology has the defects of low denitrification efficiency, high energy consumption, high yield of sludge and the like, and a large amount of organic carbon sources need to be added. Meanwhile, the rare earth tail water contains ammonia nitrogen, nitrate nitrogen, calcium ions, magnesium ions, manganese ions, fluoride, bromide ions, sulfite and sulfate and various rare earth elements, which also brings a problem for biological treatment. Therefore, a novel treatment process is needed, which not only can overcome the influence of rare earth tail water, but also can realize high-efficiency denitrification, energy conservation and organic carbon source.
Disclosure of Invention
The invention aims to solve the problems of low denitrification efficiency and large consumption of organic carbon sources commonly existing in the rare earth tail water treatment by the traditional biological denitrification technology, and provides a method for treating the rare earth tail water based on anaerobic ammonia oxidation embedded bioactive filler, so as to realize quick removal of ammonia nitrogen and total nitrogen and save the operation cost.
The main contents of the invention are as follows:
the purpose of the invention is as follows: the total nitrogen in the rare earth tail water can be removed through the anaerobic ammonia oxidation embedded bioactive filler as much as possible, so that the consumption of an organic carbon source is saved. Meanwhile, the functional flora of the anaerobic ammonia oxidation and denitrification embedded bioactive filler has strong activity, and can ensure stable denitrification and avoid the condition that the effluent does not reach the standard when the concentration of the influent ammonia nitrogen and the total nitrogen changes.
The invention is realized by the following technical scheme:
the method for treating rare earth tail water based on anaerobic ammonia oxidation embedded bioactive filler comprises a centrifugal fan (1), a gas distribution pipeline (2), a stirring device (3), a partial nitrosation pool (4), a pH probe (5), a raw water tank (6), a raw water centrifugal pump (7), a gate valve (8), an alkali liquid tank (9), an alkali liquid diaphragm type metering pump (10), a pH automatic control system (11), a sludge discharge port (12), a partial nitrosation pool reaction zone (13), a partial nitrosation pool settling zone (14), a sodium bicarbonate water tank (15), a sodium bicarbonate pump (16), a water distribution system (17), anaerobic ammonia oxidation embedded bioactive filler (18), an anaerobic ammonia oxidation reaction pool (19), an organic carbon source water tank (20), an organic carbon source metering pump (21), a denitrification pool grid (22), denitrification embedded bioactive filler (23), A denitrification tank (24); the partial nitrosation pool reaction zone (13) is a partial area of the center of the partial nitrosation pool (4), the upper part of the peripheral side surface of the partial nitrosation pool reaction zone (13) is of an upright straight barrel-shaped structure, the lower part of the peripheral side surface is of an inclined plane barrel-shaped structure, and the diameter of the lower port of the inclined plane barrel-shaped structure is larger than that of the upper port; an inclined bottom ring corresponds to the lower part of the lower port barrel wall of the inclined plane barrel-shaped structure, a gap is formed between the lower port barrel wall of the inclined plane barrel-shaped structure and the inclined bottom ring, and the vertical side barrel wall of the partial nitrosation tank (4) is connected with the horizontal bottom of the partial nitrosation tank (4) through the inclined bottom ring; the outer side of the upper port of a straight barrel-shaped structure corresponding to a part of nitrosation pool reaction zone (13) forms an overflow port through a barrel-suspending wall coaxially sleeved with the nitrosation pool, and a gap is formed between the upper port of the straight barrel-shaped structure and the barrel-suspending wall; the outer side of a reaction zone (13) of a partial nitrosation tank in the partial nitrosation tank (4) is a sedimentation zone (14) of the partial nitrosation tank;
partial nitrosation activated sludge is arranged in the partial nitrosation pool reaction zone (13); the lower end in the anaerobic ammonia oxidation reaction tank (19) is provided with a water distribution system (17); a grid (22) of the denitrification tank is arranged at the bottom in the denitrification tank (24) and is used for supporting denitrification embedding bioactive filler (23);
rare earth tail water in a raw water tank (6) passes through a gate valve (8) and alkali liquor in an alkali liquor tank (9) and enters a partial nitrosation pool reaction zone (13) through an alkali liquor diaphragm type metering pump (10), and under the action of a stirring device (3), substrates in the partial nitrosation pool reaction zone (13) are uniformly mixed; the centrifugal fan (1) supplies oxygen to the partial nitrosation pool reaction zone (13) through the gas distribution pipeline (2) at the bottom of the partial nitrosation pool reaction zone (13); the pH automatic control system (11) opens and closes the alkali liquor diaphragm metering pump (10) through the feedback of the pH probe (5) to maintain the proper pH of a part of nitrosation pool reaction zone (13); the effluent of a part of nitrosation pool sedimentation zone (14) and a sodium bicarbonate water tank (15) enter a sodium bicarbonate solution into an anaerobic ammonia oxidation reaction pool (19) through a sodium bicarbonate pump (16), and contact with an anaerobic ammonia oxidation embedded bioactive filler (18) in the anaerobic ammonia oxidation reaction pool (19) for reaction; then the effluent of the anaerobic ammonia oxidation reaction tank (19) and an organic carbon source water tank (20) enter a sodium acetate solution into a denitrification tank (24) through an organic carbon source metering pump (21) and contact and react with a denitrification embedding biological active filler (23) in the denitrification tank (24).
Partial nitrosation basin (4): the core of the device is part of nitrosation activated sludge, and the concentration MLSS of mixed liquor suspended matters is 5000 mg/L. The activated sludge contains a large amount of ammonia oxidizing bacteria (the relative abundance of the flora is 50.51 percent through high-throughput measurement), the nitrite oxidizing bacteria content is low (the relative abundance of the flora is 2.91 percent through high-throughput measurement), the ammonia oxidizing bacteria form absolute advantages to the nitrite oxidizing bacteria, and the device does not embed bioactive fillers. The partial nitrosation means that 56.9% of ammonia nitrogen is oxidized into nitrite nitrogen, so that a substrate is provided for anammox bacteria, nitrate nitrogen is not generated, and the remaining 43.1% of ammonia nitrogen is not oxidized. Part of nitrosation activated sludge is a first barrier for resisting complex ions and rare earth elements in the rare earth tail water, and the inhibition effect on subsequent anaerobic ammonium oxidation bacteria and denitrifying bacteria can be reduced. The sedimentation zone of the partial nitrosation pool can effectively retain partial nitrosation activated sludge without special sludge equipment.
Anammox cell (19): the core material of the device is anaerobic ammonia oxidation embedded bioactive filler, and the device does not have activated sludge. The reaction system only contains the embedded anaerobic ammonium oxidation bacteria. Under the anaerobic condition, anaerobic ammonia oxidizing bacteria react with bicarbonate radical as inorganic carbon source to generate nitrogen and nitrate nitrogen by using the residual ammonia nitrogen and part of nitrite nitrogen generated in the nitrosation process, so that the effluent ammonia nitrogen reaches the standard.
Denitrification tank (24): the core material of the device is denitrification embedding biological active filler, and the device does not have active sludge. The reaction system only contains the embedded denitrifying bacteria. Under the anoxic condition, denitrifying bacteria perform denitrification by using nitrate nitrogen originally in the rare earth tail water and nitrate nitrogen generated by anaerobic ammoxidation and sodium acetate as an electron acceptor, so that the total nitrogen of the effluent reaches the standard.
The method for treating the rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler comprises the following steps:
1) and regularly detecting the ammonia nitrogen concentration of the rare earth tail water every day, and determining whether DO needs to be changed according to the ammonia nitrogen concentration.
2) Preparing alkali liquor, preparing sodium bicarbonate solution according to the ammonia nitrogen concentration of inlet water of the anaerobic ammonia oxidation tank, and preparing sodium acetate solution according to the total nitrogen concentration of inlet water of the denitrification tank.
3) The rare earth tail water firstly enters a part of nitrosation pool, and DO, alkali liquor and the rare earth tail water in a reaction zone are uniformly mixed under the action of a stirring device. And the pH automatic control system automatically adds alkali according to the pH change condition of part of the nitrosation pool.
4) And (3) allowing mixed mud water in a part of nitrosification pool reaction zone to enter a part of nitrosification pool settling zone, separating water and mud, and returning sludge to the bottom of the part of nitrosification pool reaction zone to participate in the reaction in the part of nitrosification pool reaction zone.
5) And part of supernatant in the sedimentation zone of the nitrosation tank and sodium bicarbonate solution enter the anaerobic ammonia oxidation reaction tank together to contact and react with the anaerobic ammonia oxidation embedded bioactive filler.
6) And (3) the effluent of the anaerobic ammoxidation reaction tank and the sodium acetate solution enter a denitrification reaction tank together to be in contact reaction with the denitrification embedded bioactive filler, and the effluent is discharged after reaching the standard.
7) And (4) periodically discharging mud from a part of nitrosation pools.
Is mainly suitable for rare earth tail water with ammonia nitrogen concentration of more than 70mg/L and low COD. For example, the ammonia nitrogen concentration is 110 plus or minus 10mg/L, the total nitrogen concentration is 150 plus or minus 15mg/L and the COD concentration is 15 plus or minus 5 mg/L.
HRT of the partial nitrosation pool is 6h, DO is 0.5-1mg/L, and pH is 8.2-8.3. The pH automatic control system automatically adds alkali liquor according to the change condition of a pH probe of a part of nitrosation pools, namely, the alkali liquor is added when the pH is lower than 8.2, and the alkali liquor is stopped when the pH is higher than 8.3.
The concentration of free ammonia in the reaction zone of the partial nitrosation pool must be more than 5mg/L, and if the concentration is less than 5mg/L for a long time, the partial nitrosation is converted into the full nitration.
Preparing a sodium bicarbonate solution according to the ammonia nitrogen concentration of the inlet water of the anaerobic ammonia oxidation reaction tank, wherein the ratio of the sodium bicarbonate concentration to the ammonia nitrogen concentration is 3, preparing a sodium acetate solution according to the total nitrogen concentration of the inlet water of the denitrification tank, and the mass ratio of the sodium acetate concentration to the total nitrogen concentration is 4.
The HRT of the anaerobic ammonium oxidation tank is 3.1h, the pH of inlet water is 8.2-8.3, and the temperature is 25-30 ℃. HRT of the denitrification pool is 0.63 h.
The anaerobic ammonia oxidation tank contains anaerobic ammonia oxidation embedded bioactive filler, the embedded bioactive filler contains anaerobic ammonia oxidation bacteria, and the volume filling rate of the anaerobic ammonia oxidation embedded bioactive filler is 7.5%.
The denitrification tank contains denitrification embedded bioactive filler, the embedded bioactive filler contains denitrifying bacteria, and the volume filling rate of the denitrification embedded bioactive filler is 8%.
When more than 60% of ammonia nitrogen in a part of the nitrosation pond is oxidized into nitrite nitrogen, proper sludge discharge is carried out.
The invention is mainly suitable for the rare earth tail water with ammonia nitrogen concentration of more than 70mg/L and low COD. Has the following characteristics:
1. the energy consumption is low. Only 56.9 percent of ammonia nitrogen needs to be oxidized into nitrite nitrogen under the low oxygen condition, so that the supply power consumption can be saved;
2. part of the nitrosation devices adopt an internal circulation self-sedimentation reaction tank, and a sludge return system is not needed;
3. the operation cost is low. If the rare earth tail water only contains ammonia nitrogen, the total nitrogen removed by the anaerobic ammonia oxidation reaction accounts for 88.79% of the total nitrogen of the inlet water, and 88.79% of organic carbon sources can be saved theoretically;
4. the pollution is low. The output of partial nitrosation stage is reduced compared with the whole nitration sludge, and the anaerobic ammonia oxidation embedding biological active filler hardly generates sludge in the operation process;
5. the denitrification efficiency is high. In the experiment, the denitrification efficiency of the anaerobic ammonia oxidation and denitrification embedded bioactive filler is obviously higher than that of the traditional nitrification and denitrification process;
6. the embedded bioactive filler is easy to realize solid-liquid separation, and the loss of anaerobic ammonium oxidation bacteria and denitrifying bacteria does not exist.
Drawings
FIG. 1 is a process flow diagram of the process of the present invention.
Centrifugal fan (1), gas distribution pipeline (2), agitating unit (3), partial nitrosation pond (4), pH probe (5), former water tank (6), former water centrifugal pump (7), gate valve (8), lye tank (9), lye diaphragm type measuring pump (10), pH autonomous system (11), sludge discharge mouth (12), partial nitrosation pond reaction zone (13), partial nitrosation pond settling zone (14), sodium bicarbonate water tank (15), sodium bicarbonate pump (16), water distribution system (17), anammox embedding biological activity filler (18), anammox reaction tank (19), organic carbon source water tank (20), organic carbon source measuring pump (21), denitrification pond net (22), denitrification embedding biological activity filler (23), denitrification pond (24).
Detailed Description
The following examples are set forth in order to provide those skilled in the art with a better understanding of the present invention and are intended to be included within the scope of the present invention.
Example 1
The rare earth tail water of Jiangxi Ganzhou is taken as an object, and the water quality indexes of raw water are as follows: the variation range of the ammonia nitrogen concentration is 110 +/-10 mg/L, the total nitrogen concentration is 150 +/-15 mg/L, COD, the concentration is 15 +/-5 mg/L, pH, the variation range is 8.9 +/-0.5, the concentration of total rare earth elements is 1 +/-0.1 mg/L, the concentration of calcium ions is 120 +/-10 mg/L, the concentration of magnesium ions is 12 +/-2 mg/L, and the concentration of sulfate ions is 940 +/-50 mg/L, wherein the ammonia nitrogen concentration and the total nitrogen concentration far exceed the limit requirement of rare earth industrial pollutant discharge standard GB 26451-2011.
The method for treating the rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler comprises the following specific operation method:
the rare earth tail water firstly enters a part of nitrosation tanks to carry out nitrosation reaction, the pH value of a reaction zone of the part of nitrosation tanks is adjusted to be 8.2-8.3, the HRT is 6h, the DO is 0.5-1mg/L and the concentration of free ammonia is more than 5mg/L, so that about 56.9% of ammonia nitrogen is converted into nitrite nitrogen, and mixed liquor containing the nitrite nitrogen and the ammonia nitrogen (the ratio of the concentrations of the nitrite nitrogen and the ammonia nitrogen is about 1.32) is formed. When the ammonia nitrogen concentration of inlet water is lower, the concentration of free ammonia in a reaction zone of a part of nitrosation tanks is required to be maintained to be more than 5 mg/L. And then the mixed solution enters a part of a nitrosation pool sedimentation area for sludge-water separation, and enters an anaerobic ammonium oxidation pool after being mixed with a sodium bicarbonate solution. Ammonia nitrogen and nitrite nitrogen are removed through denitrification reaction of anaerobic ammonia oxidation embedded bioactive filler (the volume filling rate is 7.5%) under the conditions that the HRT is 3.1h and the temperature is 30 ℃, and the main component of effluent is nitrate nitrogen. And mixing the effluent with a sodium acetate solution, then feeding the mixture into a denitrification tank, and carrying out denitrification reaction by using a denitrification embedding bioactive filler (the volume filling rate is 8%) under the condition that the HRT is 0.63h to remove nitrate nitrogen, thereby finally realizing the standard discharge of ammonia nitrogen and total nitrogen.
The device shown in figure 1 is operated continuously for 82 days, anaerobic ammonia oxidation embedding growth is carried outThe total nitrogen removal rate of the bioactive filler can reach 1kg N/(m) at most3D), the total nitrogen removal rate of the denitrification embedded bioactive filler can reach 2.3kg N/(m) at most3D). The water quality of the process effluent is good, the average concentration of the ammonia nitrogen of the effluent is 3.01mg/L, the average concentration of the total nitrogen of the effluent is 5.11mg/L, and the requirement of the discharge standard of rare earth industrial pollutants GB26451 plus 2011 is met.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitutions or changes made by the person skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The method for treating rare earth tail water based on anaerobic ammonia oxidation embedded bioactive filler is characterized in that the adopted device comprises a centrifugal fan (1), a gas distribution pipeline (2), a stirring device (3), a partial nitrosation pool (4), a pH probe (5), a raw water tank (6), a raw water centrifugal pump (7), a gate valve (8), an alkali liquor tank (9), an alkali liquor diaphragm type metering pump (10), a pH automatic control system (11), a sludge discharge port (12), a partial nitrosation pool reaction zone (13), a partial nitrosation pool settling zone (14), a sodium bicarbonate water tank (15), a sodium bicarbonate pump (16), a water distribution system (17), anaerobic ammonia oxidation embedded bioactive filler (18), an anaerobic ammonia oxidation reaction pool (19), an organic carbon source water tank (20), an organic carbon source metering pump (21), a denitrification pool grid (22), denitrification embedded bioactive filler (23), A denitrification tank (24); the partial nitrosation pool reaction zone (13) is a partial area of the center of the partial nitrosation pool (4), the upper part of the peripheral side surface of the partial nitrosation pool reaction zone (13) is of an upright straight barrel-shaped structure, the lower part of the peripheral side surface is of an inclined plane barrel-shaped structure, and the diameter of the lower port of the inclined plane barrel-shaped structure is larger than that of the upper port; an inclined bottom ring corresponds to the lower part of the lower port barrel wall of the inclined plane barrel-shaped structure, a gap is formed between the lower port barrel wall of the inclined plane barrel-shaped structure and the inclined bottom ring, and the vertical side barrel wall of the partial nitrosation tank (4) is connected with the horizontal bottom of the partial nitrosation tank (4) through the inclined bottom ring; the outer side of the upper port of a straight barrel-shaped structure corresponding to a part of nitrosation pool reaction zone (13) forms an overflow port through a barrel-suspending wall coaxially sleeved with the nitrosation pool, and a gap is formed between the upper port of the straight barrel-shaped structure and the barrel-suspending wall; the outer side of a reaction zone (13) of a partial nitrosation pool in the partial nitrosation pool (4) is a partial nitrosation pool settling zone (14);
partial nitrosation activated sludge is arranged in the partial nitrosation pool reaction zone (13); a water distribution system (17) is arranged at the lower end in the anaerobic ammonia oxidation reaction tank (19); a grid (22) of the denitrification tank is arranged at the bottom in the denitrification tank (24) and is used for supporting denitrification embedding bioactive filler (23);
rare earth tail water in a raw water tank (6) passes through a gate valve (8) and alkali liquor in an alkali liquor tank (9) and enters a part of nitrosation pool reaction zone (13) through an alkali liquor diaphragm type metering pump (10), and the substrates in the part of nitrosation pool reaction zone (13) are uniformly mixed under the action of a stirring device (3); a centrifugal fan (1) supplies oxygen to part of the nitrosation pool reaction zone (13) through an air distribution pipeline (2) at the bottom of the part of the nitrosation pool reaction zone (13); the pH automatic control system (11) opens and closes the alkali liquor diaphragm metering pump (10) through the feedback of the pH probe (5) to maintain the proper pH of a part of nitrosation pool reaction zone (13); the effluent of a part of nitrosation pool sedimentation zone (14) and a sodium bicarbonate water tank (15) enter a sodium bicarbonate solution into an anaerobic ammonia oxidation reaction pool (19) through a sodium bicarbonate pump (16), and contact with an anaerobic ammonia oxidation embedded bioactive filler (18) in the anaerobic ammonia oxidation reaction pool (19) for reaction; then the effluent of the anaerobic ammonia oxidation reaction tank (19) and an organic carbon source water tank (20) enter a sodium acetate solution into a denitrification tank (24) through an organic carbon source metering pump (21) and contact and react with a denitrification embedding biological active filler (23) in the denitrification tank (24).
2. The method for treating rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler is characterized in that a partial nitrosation tank (4): the core of the device is partial nitrosation activated sludge, the concentration MLSS of mixed liquor suspended matters is 5000mg/L, the activated sludge contains a large amount of ammonia oxidizing bacteria (the relative abundance of flora is 50.51% by high-throughput measurement), and the content of nitrite oxidizing bacteria is low (the relative abundance of flora is 2.91% by high-throughput measurement); the partial nitrosation means that 56.9% of ammonia nitrogen is oxidized into nitrite nitrogen, nitrate nitrogen is not generated, and the remaining 43.1% of ammonia nitrogen is not oxidized.
Anammox cell (19): the core material of the device is anaerobic ammonia oxidation embedded bioactive filler, and a reaction system only contains embedded anaerobic ammonia oxidation bacteria; under the anaerobic condition, anaerobic ammonia oxidizing bacteria react with bicarbonate radical as an inorganic carbon source by using the residual ammonia nitrogen and part of nitrite nitrogen generated in the nitrosation process to generate nitrogen and nitrate nitrogen, so that the effluent ammonia nitrogen reaches the standard;
denitrification tank (24): the core material of the device is denitrification embedded bioactive filler, the reaction system only contains embedded denitrifying bacteria, and under the anoxic condition, the denitrifying bacteria carry out denitrification by using the original nitrate nitrogen in the rare earth tail water and the nitrate nitrogen generated by the anaerobic ammonia oxidation reaction and using sodium acetate as an electron acceptor, so that the standard of the total nitrogen of the effluent is reached.
3. The method for treating rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler according to claim 1, is characterized by comprising the following steps:
1) and regularly detecting the ammonia nitrogen concentration of the rare earth tail water every day, and determining whether DO needs to be changed according to the ammonia nitrogen concentration.
2) Preparing alkali liquor, namely preparing a sodium bicarbonate solution according to the ammonia nitrogen concentration of inlet water of the anaerobic ammonia oxidation tank and preparing a sodium acetate solution according to the total nitrogen concentration of inlet water of the denitrification tank;
3) the rare earth tail water firstly enters a part of nitrosation pool, and DO, alkali liquor and the rare earth tail water in a reaction zone are uniformly mixed under the action of a stirring device. The pH automatic control system automatically adds alkali according to the pH change condition of part of the nitrosation pool;
4) the mixed mud water of a part of the reaction area of the nitrosation pool enters a sedimentation area of a part of the nitrosation pool, the water and the mud are separated, and the sludge returns to the bottom of the reaction area of the part of the nitrosation pool again to participate in the reaction of the reaction area of the part of the nitrosation pool;
5) supernatant liquid of a partial nitrosation tank sedimentation zone and sodium bicarbonate solution enter an anaerobic ammonia oxidation reaction tank together, and contact-react with anaerobic ammonia oxidation embedded bioactive filler;
6) the effluent of the anaerobic ammoxidation reaction tank and the sodium acetate solution enter a denitrification reaction tank together, and contact reaction is carried out on the effluent and the denitrification embedded bioactive filler, and the effluent is discharged after reaching the standard;
7) and (4) periodically discharging mud from a part of nitrosation pools.
4. The method for treating the rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler is characterized by being mainly suitable for the rare earth tail water with ammonia nitrogen concentration of more than 70mg/L and low COD.
5. The method for treating the rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler according to claim 1, wherein the ratio of the rare earth tail water: the variation range of the ammonia nitrogen concentration is 110 +/-10 mg/L, the total nitrogen concentration is 150 +/-15 mg/L, COD concentration is 15 +/-5 mg/L, pH, the variation range is 8.9 +/-0.5, the total rare earth element concentration is 1 +/-0.1 mg/L, and the calcium ion, the magnesium ion and the sulfate ion can be further included.
6. The method for treating rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler according to claim 1, wherein the HRT of the partial nitrosation tank is 6h, the DO is 0.5-1mg/L, and the pH is 8.2-8.3. The pH automatic control system automatically adds alkali liquor according to the change condition of a pH probe of a part of nitrosation pools, namely, the alkali liquor is added when the pH is lower than 8.2, and the alkali liquor is stopped when the pH is higher than 8.3;
the concentration of free ammonia in the reaction zone of the partial nitrosation pool must be more than 5mg/L, and if the concentration is less than 5mg/L for a long time, the partial nitrosation is converted into the full nitration.
7. The method for treating the rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler is characterized in that a sodium bicarbonate solution is prepared according to the ammonia nitrogen concentration of inlet water of an anaerobic ammonia oxidation reaction tank, the ratio of the sodium bicarbonate concentration to the ammonia nitrogen concentration is 3, a sodium acetate solution is prepared according to the total nitrogen concentration of inlet water of a denitrification tank, and the mass ratio of the sodium acetate concentration to the total nitrogen concentration is 4;
the HRT of the anaerobic ammonia oxidation tank is 3.1h, and the temperature is 25-30 ℃. The HRT of the denitrification tank is 0.63 h.
8. The method for treating rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler is characterized in that the anaerobic ammonia oxidation tank contains the anaerobic ammonia oxidation embedded bioactive filler, the embedded bioactive filler contains anaerobic ammonia oxidizing bacteria, and the volume filling rate of the anaerobic ammonia oxidation embedded bioactive filler is 7.5%.
9. The method for treating rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler is characterized in that the denitrification tank contains the denitrification embedded bioactive filler, the embedded bioactive filler contains denitrifying bacteria, and the volume filling rate of the denitrification embedded bioactive filler is 8%.
10. The method for treating rare earth tail water based on the anaerobic ammonia oxidation embedded bioactive filler according to claim 1, characterized in that proper sludge discharge is performed when more than 60% of ammonia nitrogen in a part of the nitrosation tank is found to be oxidized into nitrite nitrogen.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006263719A (en) * | 2005-02-28 | 2006-10-05 | Hitachi Plant Technologies Ltd | Process and equipment for treating ammonia-containing liquid |
| CN201125187Y (en) * | 2007-11-15 | 2008-10-01 | 中国石油化工股份有限公司 | Three-phase internal circulation biochemical reaction apparatus |
| CN103922450A (en) * | 2014-04-10 | 2014-07-16 | 北京工业大学 | Efficient hardness removal method and device applicable to underground water |
| CN109467186A (en) * | 2018-11-30 | 2019-03-15 | 华南理工大学 | A kind of pre- nitrosation-anaerobic ammoxidation efficient denitrification method in ammonia nitrogen waste water part |
| CN113072184A (en) * | 2021-04-14 | 2021-07-06 | 天朝环境科技(北京)有限公司 | Anaerobic ammonia oxidation based independent denitrification 'coupled' system and water treatment method |
| CN214167719U (en) * | 2021-01-11 | 2021-09-10 | 东华理工大学 | Rare earth tail water denitrification treatment device |
-
2022
- 2022-03-23 CN CN202210297623.4A patent/CN114751514A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006263719A (en) * | 2005-02-28 | 2006-10-05 | Hitachi Plant Technologies Ltd | Process and equipment for treating ammonia-containing liquid |
| CN201125187Y (en) * | 2007-11-15 | 2008-10-01 | 中国石油化工股份有限公司 | Three-phase internal circulation biochemical reaction apparatus |
| CN103922450A (en) * | 2014-04-10 | 2014-07-16 | 北京工业大学 | Efficient hardness removal method and device applicable to underground water |
| CN109467186A (en) * | 2018-11-30 | 2019-03-15 | 华南理工大学 | A kind of pre- nitrosation-anaerobic ammoxidation efficient denitrification method in ammonia nitrogen waste water part |
| CN214167719U (en) * | 2021-01-11 | 2021-09-10 | 东华理工大学 | Rare earth tail water denitrification treatment device |
| CN113072184A (en) * | 2021-04-14 | 2021-07-06 | 天朝环境科技(北京)有限公司 | Anaerobic ammonia oxidation based independent denitrification 'coupled' system and water treatment method |
Non-Patent Citations (1)
| Title |
|---|
| 中国环境科学学会: "《中国环境科学学会学术年会 论文集 2009 第二卷》", 30 June 2009, 北京航空航天大学出版社 * |
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