Ionic type rare earth mine tail algae bacteria combined denitrification system
Through the series process of synchronous nitration and denitrification of microalgae assimilation denitrification and AGS nitration denitrification denitrogenation denitrogenation, the problem of difficult removal of nitrogen pollution in tailwater in ionic rare earth mines is solved, and the effect of efficient denitrification and reducing operating costs is achieved.
Patent Information
- Application Number
- CN202422049983.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The prior art is difficult to efficiently remove nitrogen pollution in tailwater of ionic rare earth mines, and the traditional biochemical treatment method is costly and the bacteria proliferate slowly, which affects the nitrogen removal effect.
The tandem process of microalgae assimilation denitrification and AGS synchronous nitration denitrification denitrification denitrification is adopted. Through the tandem operation of the primary PSBR system and the secondary SBR system, the microalgae assimilation and removal of part of the total nitrogen under photosynthesis, and the AGS is nitration denitrification without the need for an organic carbon source to remove the remaining total nitrogen.
It improves the denitrification efficiency, reduces the amount of organic carbon sources, reduces operating costs, and achieves efficient denitrification, meeting the limit requirements of the "Ionic Rare Earth Mining Water Pollutant Emission Standards".
Smart Images
Figure CN222821360U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ionic rare earth mine tail water denitrification, in particular to an ionic rare earth mine tail water algae-bacteria combined denitrification system. Background Art
[0002] During the service period and after abandonment of ionic rare earth mines, a large amount of nitrogen-containing liquid leached out forms ionic rare earth mine tailings through runoff and undercurrent in the mining area. This ionic rare earth mine tailings, which has the characteristics of acidic, inorganic, high-ammonia nitrogen wastewater, has become a key source of pollution in the region.
[0003] The biochemical method for treating wastewater has a low operating cost and is suitable for denitrification of organic wastewater. When treating ionic rare earth mine tailings, this method has very limited ability to remove total nitrogen due to the lack of an organic carbon source. In actual applications, it is usually necessary to adjust the alkalinity and nitrification first, and then continuously add an organic carbon source and dispose of the remaining sludge. This intermittent treatment method has extremely high operating costs due to energy and material consumption.
[0004] Studies have reported that the aerobic granular sludge (AGS) denitrification method has the advantages of fast sedimentation, high toxicity resistance, and single-stage nitrogen and phosphorus removal. However, when it is used to treat inorganic wastewater, the bacteria proliferate slowly, and under high nitrogen loads, the endogenous metabolism of denitrifying bacteria affects the stability of the structure, which directly affects the denitrification effect of ionic rare earth mine tailings. Summary of the invention
[0005] The utility model aims to provide an ionic rare earth mine tail water denitrification system by constructing a microalgae assimilation denitrification and AGS synchronous nitrification and denitrification denitrification series process, so as to improve the denitrification efficiency and reduce the operation cost.
[0006] The technical solution adopted by the utility model is as follows:
[0007] An ionic rare earth mine tail water algae-bacteria combined denitrification system comprises a primary PSBR system and a secondary SBR system, wherein the primary PSBR system and the secondary SBR system are operated in series, that is, when the primary PSBR treats the ionic rare earth mine tail water, the secondary SBR simultaneously treats the effluent of the previous cycle of the primary PSBR, and the operation cycle of the series system is 12 hours;
[0008] The primary PSBR system includes a regulating tank, a sewage lifting pump arranged in the regulating tank, a primary light algae reactor provided with a water outlet, a group of waterproof light strips and a submersible pump arranged in the primary light algae reactor, and a pipe with one end connected to the lifting pump and the other end inserted into the primary light algae reactor;
[0009] The secondary SBR system includes an AGS reactor with a drain outlet, an agitator arranged in the AGS reactor, an air pump, a peristaltic pump, and a carbon source barrel. One end of the air pump is connected to a pipe inserted into the AGS reactor to connect to an aeration device. One end of the carbon source pipe is arranged in the carbon source barrel and the other end is inserted into the AGS reactor. The peristaltic pump is arranged on the carbon source pipe; the water outlet is connected to the AGS reactor through a pipe.
[0010] Furthermore, the water exchange rate of the first-level photoalgae reactor is 30%~50%, and the operation cycle is 6 hours.
[0011] Furthermore, the illumination intensity of the set of waterproof light strips is 3000~5000 lux.
[0012] Furthermore, the water exchange rate of the AGS reactor is 50%~60%, the water exchange volume is the same as the water outlet volume of the first-level photoalgae reactor, the operation cycle is 6h, and the aeration intensity is 2~3 L / min.
[0013] Furthermore, the rotation speed of the stirrer is 200 rpm.
[0014] Furthermore, a filter cloth with a pore size of 0.05 mm is detachably installed at the water outlet of the first-level photoalgae reactor.
[0015] Furthermore, the pH of the ionic rare earth mine tailings in the regulating pool is 4-5, ammonia nitrogen ≤100 mg / L, and COD ≤50 mg / L.
[0016] The utility model has the following advantages:
[0017] The utility model utilizes a primary PSBR system to remove part of the total nitrogen by assimilation under photosynthesis. In this process, the microalgae assimilate and no organic carbon source is required. The secondary SBR system removes the remaining total nitrogen by endogenous nitrification and denitrification of AGS. In this process, no organic carbon source is required, and the rest of the total nitrogen is removed by exogenous nitrification and denitrification of AGS. The two-stage series system of microalgae assimilation and denitrification and AGS synchronous nitrification and denitrification constructed by the utility model improves the independent growth environment of microalgae and AGS, reduces the competition for carbon sources between algae and fungi in a single-stage system, realizes efficient denitrification, reduces the dosage of organic carbon sources, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the structure of the utility model;
[0019] Figure 2 This is a morphological diagram of microalgae and aerobic granular sludge according to an embodiment of the utility model;
[0020] Figure 3 This is a purification effect diagram of an embodiment of the utility model.
[0021] Among them: a is the effluent of the first-stage PSBR system, and b is the effluent of the second-stage SBR system. DETAILED DESCRIPTION
[0022] like Figure 1 As shown, an ionic rare earth mine tail water algae bacteria combined denitrification system includes a primary PSBR system and a secondary SBR system, wherein the primary PSBR system and the secondary SBR system are connected in series; the primary PSBR system includes a regulating tank 1, wherein the water exchange rate of the primary light algae reactor can be set to 30% to 50%, and the operation cycle is 6 hours, a sewage lifting pump 2 arranged in the regulating tank, a primary light algae reactor 3 provided with a water outlet 31, a group of waterproof light strips 4 and a submersible pump 5 arranged in the primary light algae reactor, wherein the light intensity of the group of waterproof light strips is 3000 to 5000 lux to provide light energy for photosynthesis of microalgae, which is beneficial to assimilation and removal of total nitrogen under photosynthesis, and a pipe 6 with one end connected to the lifting pump and the other end inserted into the primary light algae reactor;
[0023] The secondary SBR system includes an AGS reactor 7 provided with a drain port 71, the water exchange rate of the AGS reactor is 50%-60%, the water exchange volume is the same as the water outlet volume of the primary light algae reactor, the operation cycle is 6h, the aeration intensity is 2-3 L / min to provide oxygen for nitrifying bacteria to oxidize ammonia nitrogen, an agitator 8 is arranged in the AGS reactor, the speed of the agitator can be set to 200 rpm, an air pump 9, a peristaltic pump 10, a carbon source barrel 11, one end of the air pump is connected to a pipe inserted into the AGS reactor to connect to the aeration device 14, one end of the carbon source pipeline 12 is arranged in the carbon source barrel and the other end is inserted into the AGS reactor and is located on the water level, and the peristaltic pump is arranged on the carbon source pipeline; the water outlet is connected to the AGS reactor through a pipeline.
[0024] The water outlet of the first-level photoalgae reactor is detachably equipped with a filter cloth with a pore size of 0.05 mm. When the drainage time exceeds 5 minutes, the filter cloth needs to be cleaned and replaced. The utility model has a better denitrification effect when the pH of the ionic rare earth mine tailings in the regulating pool is 4-5, the ammonia nitrogen is ≤100 mg / L, and the COD is ≤50 mg / L. Example
[0025] The ionic rare earth mine tail water (pH 4-5, ammonia nitrogen 100 mg / L, alkalinity 9 mmol / L) was collected in the regulating tank. The regulating time of the regulating tank was 12 h. Before lifting, lime was added to adjust the pH of the tail water to 7-8. The lifting pump (this embodiment uses Jingnuo JN-388 submersible pump with a power of 16 W and a flow rate of 800 L / h), submersible pump (this embodiment uses Sensen HJ500), and waterproof light strip (this embodiment uses LED light strip, which is fixed to the liquid level of the inner wall of the first-level light algae reactor with a suction cup, and can also be fixed in the first-level light algae reactor by other methods such as hanging), and the tail water enters the first-level light algae reactor (the size of the first-level light algae reactor used in this embodiment is 39 cm in outer diameter, 32 cm in inner diameter, 20 L in effective volume, 44% in water exchange rate, and 8.8 L in water exchange volume) was turned on. The operation cycle was 6 h, including: water inlet (5 min)→stirring (the submersible pump mixes the algae and the liquid for 180 min, and the submersible pump stops working during sedimentation)→standing (170 min)→sedimentation (10 min)→effluent (5 min), the light intensity is 4000 lux, the time is 325 min (no light at the inlet and outlet, and the light is stopped 30 minutes before drainage); after the primary PSBR system removes part of the total nitrogen, the primary microalgae effluent passes through the filter cloth to intercept part of the effluent microalgae and enters the secondary SBR system, AGS reactor (the AGS reactor in this embodiment has a height of 65 cm, an inner diameter of 19 cm, an effective volume of 17 L, a water exchange rate of 52%, and a water exchange volume of 8.8 L), the operation cycle is 6 h, including: water inlet (5 min)→aeration (60 min)→stirring (170 min)→aeration (120 min)→sedimentation (3 min)→effluent (2 min), aeration in the aerobic stage is provided by an ACO-012A electromagnetic air pump, and the aeration intensity is 2.6 L / min, the anoxic stirring section starts the motor 13, the stirring speed of the stirrer is 200 rpm, and 5 minutes before the start of the anoxic stirring section, 22.5 mL of sodium acetate solution (the COD contributed is 180 mg / L) is added by a peristaltic pump (this embodiment uses a peristaltic pump of Leifu BT100L) for 5 minutes; after running for 30 days, Figure 2 As shown, the chlorophyll a and algae density of the microalgae were 16.11 mg / L and 1007 mg / L, respectively, the AGS structure was more compact, and the SVI and granulation rate were 33.93 mg / L and 96.04%, respectively.
[0026] like Figure 3 As shown in the figure, the effluent quality of the primary PSBR system began to stabilize from the 25th day. Figure 3 As shown in Figure a, about 40% of the ammonia nitrogen and 30% of the TIN in the influent were removed, and the effluent from the secondary SBR system began to stabilize from the 15th day. Figure 3As shown in b, 90% of ammonia nitrogen and 57% of TIN were removed in the primary effluent, and the steady-state ammonia nitrogen and TIN removal rates were 95% and 70%, respectively. The effluent met the limit requirements of the "Ionic Rare Earth Mine Water Pollutant Emission Standard" (DB36 / 1016-2018).
[0027] According to the German ATV standard (ATV-DVWKA131E), activated sludge needs to consume 5 g of carbon source (in terms of COD) to remove 1 g of nitrogen. The utility model can remove about 70 mg / L of influent TIN, theoretically consuming 350 mg / L of COD, but actually only consuming 180 mg / L of COD, saving about 49% of the carbon source consumption of external carbon source.
[0028] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.
Claims
1. An ionic rare earth mine tail water algae and bacteria combined denitrification system, characterized in that: It comprises a primary PSBR system and a secondary SBR system, wherein the primary PSBR system and the secondary SBR system are operated in series; The primary PSBR system comprises a regulating tank (1), a sewage lifting pump (2) arranged in the regulating tank, a primary light algae reactor (3) provided with a water outlet (31), a group of waterproof light strips (4) and a submersible pump (5) arranged in the primary light algae reactor, and a pipe (6) with one end connected to the lifting pump and the other end inserted into the primary light algae reactor; The two-stage SBR system comprises an AGS reactor (7) provided with a drain port (71), an agitator (8) arranged in the AGS reactor, an air pump (9), a peristaltic pump (10), and a carbon source barrel (11); one end of the air pump is connected to a pipeline and inserted into the AGS reactor; one end of the carbon source pipeline (12) is arranged in the carbon source barrel and the other end is inserted into the AGS reactor; the peristaltic pump is arranged on the carbon source pipeline; and the water outlet is connected to the AGS reactor via a pipeline.
2. The ionic rare earth mine tail water algae and bacteria combined denitrification system according to claim 1 is characterized in that: The water exchange rate of the first-level photoalgae reactor is 30%-50%, and the operation cycle is 6 hours.
3. The ionic rare earth mine tail water algae and bacteria combined denitrification system according to claim 1 is characterized in that: The illumination intensity of the set of waterproof light strips is 3000~5000 lux.
4. The ionic rare earth mine tail water algae and bacteria combined denitrification system according to claim 1, characterized in that: The water exchange rate of the AGS reactor is 50%-60%, the water exchange volume is the same as the water output volume of the first-level photoalgae reactor, the operation cycle is 6h, and the aeration intensity is 2-3 L / min.
5. The ionic rare earth mine tail water algae and bacteria combined denitrification system according to claim 1 is characterized in that: The rotation speed of the stirrer was 200 rpm.
6. The ionic rare earth mine tail water algae-bacteria combined denitrification system according to any one of claims 1 to 5, characterized in that: The water outlet of the first-level photoalgae reactor is detachably mounted with a filter cloth with a pore size of 0.05 mm.
7. The ionic rare earth mine tail water algae-bacteria combined denitrification system according to claim 6, characterized in that: The pH of the ionic rare earth mine tailings in the regulating pool is 4-5, ammonia nitrogen ≤100 mg / L, and COD ≤50 mg / L.