CN110642380B - Method for treating rare earth wastewater by using scale outdoor pool microorganisms - Google Patents
Method for treating rare earth wastewater by using scale outdoor pool microorganisms Download PDFInfo
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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
- C02F3/30—Aerobic and anaerobic processes
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
- C02F3/325—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae as symbiotic combination of algae and bacteria
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- 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
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
Abstract
The invention relates to a method for treating rare earth wastewater by using scale outdoor pool microorganisms. The system for treating the rare earth wastewater consists of an ammonia nitrogen wastewater conveying system to be treated, a wastewater treatment tank, an aeration mixing device, a bacterial liquid adding system, a pH adjusting agent adding system and a monitoring control system, and is sequentially distributed on the wastewater treatment tank; the monitoring control system is composed of a monitoring system and a controller. According to the method, firstly ammonia nitrogen wastewater and photoautotrophic mixed bacteria liquid are injected into a facultative tank, in the process of continuously injecting ammonia nitrogen wastewater to be treated into the facultative tank, water in the facultative tank overflows into an anaerobic tank, after the anaerobic tank is also full, water in the anaerobic tank overflows into an aerobic tank, and finally, effluent reaching the standard is discharged outwards through a tail water discharge pipe. The invention monitors the index change in real time in the whole course through an on-line monitoring sensor. The construction cost is low according to the space condition of the mining area. The treated ammonia nitrogen index meets the emission standard. The cost of ton treatment is extremely low and the benefit is extremely remarkable.
Description
Technical Field
The invention relates to a method for treating rare earth wastewater by using scale outdoor pool microorganisms.
Background
The south ionic rare earth is an important strategic resource which is valuable and nonrenewable in China, and an in-situ leaching mining process is mainly adopted at presentAmmonium sulfate is an ore leaching agent, and when a large amount of high-concentration ammonia nitrogen wastewater and ammonia nitrogen wastewater carried by extravasation or rainwater remain after mining, the ammonia nitrogen wastewater affects local surface water quality for more than ten years, so that a high-efficiency, safe, economical and feasible matched ammonia nitrogen purification treatment technology is needed. The current technology for treating ammonia nitrogen wastewater at home and abroad mainly comprises an ammonia distillation method, a break point chlorine method, a chemical precipitation method, a reverse osmosis membrane method, a biological deamination method and the like, wherein the biological deamination method has relatively low cost, but the existing strain has high demand for carbon sources, the rare earth wastewater contains almost no carbon sources, a large amount of sugar carbon sources need to be supplemented, and the cost is still high, so that the biological deamination method cannot be popularized and applied in industry. On the other hand, when mining is performed by mine sheeting, a large amount of wastewater containing high-concentration ammonia nitrogen remains, which is more difficult to treat. Therefore, the environmental problem caused by ammonia nitrogen pollution becomes an industrial critical problem for limiting the development of rare earth industry in China. The invention opens up a unique thought according to local conditions, utilizes the geographical conditions of the mine, and constructs the method which uses CO in the air by separating and breeding photosynthetic autotrophic microorganisms 2 The method is characterized in that the method takes sunlight as an energy source, a large amount of ammonia nitrogen is absorbed and organic carbon sources and thalli are synthesized for subsequent nitrification and denitrification microorganism growth and ammonia nitrogen removal, and finally ammonia nitrogen in the rare earth mining sewage is purified to be below 15mg/L required by national emission standards of rare earth industrial pollutants (GB 26451-2011), so that the purpose of no need of adding sugar carbon sources is realized, the ammonia nitrogen treatment cost is reduced fundamentally, and a foundation is laid for healthy and stable development of the rare earth industry.
Disclosure of Invention
Aiming at the situation of the prior art, the invention aims to provide a method for treating rare earth wastewater by using scale outdoor pool microorganisms, which can effectively play a role in purifying water in a long-term operation.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
1) System for treating rare earth wastewater
The rare earth wastewater treatment system consists of an ammonia nitrogen wastewater conveying system to be treated, a wastewater treatment tank, an aeration mixing device, a bacterial liquid adding system, a pH adjusting agent adding system and a monitoring control system, wherein the bacterial liquid system and the pH adjusting agent adding system are sequentially distributed on the wastewater treatment tank, and the temperature control system and the aeration mixing device are distributed on the bottom of the wastewater treatment tank; the aeration mixing device, the pH adjusting agent adding system and the bacterial liquid adding system are indirectly connected with the treatment tank through corresponding gas pipes, transfusion pipes and conveying pipes respectively; the monitoring control system consists of a monitoring system and a controller, wherein an ammonia nitrogen on-line monitoring sensor, a pH value on-line monitoring sensor and a dissolved oxygen on-line monitoring sensor in the monitoring system are arranged on the inner side wall of the wastewater treatment tank; the microprocessor is respectively connected with the ammonia nitrogen on-line monitoring sensor, the pH value on-line monitoring sensor and the dissolved oxygen on-line monitoring sensor, and is used for regularly receiving ammonia nitrogen content, pH value and dissolved oxygen data of each sensor, and the microprocessor is connected with the bacterial liquid adding system, the ventilation mixing device and the pH adjusting agent adding system.
The system for treating the rare earth wastewater is characterized in that a plurality of water body temperature heating rods are further arranged on the bottom surface of the wastewater treatment tank, and the water body temperature is increased by electrifying when necessary.
The wastewater treatment tank is formed by serially connecting a facultative tank, an anaerobic tank and an aerobic tank, the inner side surface of the treatment tank is subjected to anti-seepage treatment, and the facultative tank and the anaerobic tank and the aerobic tank are connected through a primary overflow pipe and a secondary overflow pipe in diagonal ranges; the aeration mixing device consists of an air blower, an air pipe, an aeration disc and air holes, wherein the aeration disc is distributed at the bottoms of the facultative tank and the anaerobic tank, the aeration is beneficial to stirring water bodies, and the air holes are arranged at the bottom of the aerobic tank, so that the water bodies are beneficial to dissolving oxygen. The gas pipe is respectively connected with the aeration disc and the gas hole at the bottoms of the facultative tank, the anaerobic tank and the aerobic tank through the automatic control diverter valve.
The bacterial liquid adding system consists of a bacterial liquid tank, an automatic control flow dividing valve, a flowmeter and a perfusion tube, wherein the perfusion tube connected with the automatic control flow dividing valve is respectively opened in the facultative tank, the anaerobic tank and the aerobic tank.
The pH adjusting agent adding system consists of a pH adjusting agent storage tank, a delivery pump, a delivery pipe and a flowmeter, wherein an automatic control flow dividing valve is arranged in the delivery pipe, and the delivery pipe is respectively opened in the facultative tank, the anaerobic tank and the aerobic tank through the automatic control flow dividing valve.
The monitoring control system consists of a monitoring system and a controller, and the controller is connected with the bacterial liquid adding system, the aeration mixing device and the pH adjusting agent adding system; the controller is provided with a microprocessor, wherein the microprocessor internally comprises a memory and an analog-to-digital converter, or the memory and the analog-to-digital converter are expanded outside the microprocessor according to the requirement.
The monitoring system consists of an ammonia nitrogen on-line monitoring sensor, a pH value on-line monitoring sensor and a dissolved oxygen on-line monitoring sensor. The microprocessor is respectively connected with the ammonia nitrogen on-line monitoring sensor, the pH value on-line monitoring sensor and the dissolved oxygen on-line monitoring sensor, receives ammonia nitrogen content, pH value and dissolved oxygen data of each sensor at regular time, and determines whether to start a pH adjusting agent input pump in the pH adjusting agent adding system and a blower in the ventilation mixing device according to the obtained data. Meanwhile, the pH value on-line monitoring sensor monitors the pH value in real time, and once the exceeding microprocessor is found, the pH regulating agent is controlled to be added to correct the pH value.
The ammonia nitrogen on-line monitoring sensor is positioned in the water body on the inner side walls of the facultative tank, the anaerobic tank and the aerobic tank treatment tank, and is connected with the microprocessor through a signal transmission wire, and concentration data is sent to the microprocessor in real time. When the ammonia nitrogen concentration value reaches a set value, the microprocessor sends out an instruction, the bacterial liquid infusion pump is started, and the bacterial liquid adding system automatically injects a unit volume of photoautotrophic mixed bacterial liquid into a corresponding treatment tank, so that the bacterial liquid concentration and the action capacity in the water body of the treatment tank are improved.
The pH value on-line monitoring sensor is positioned in the water body on the inner side wall of the tail water treatment tank, is connected with the microprocessor through a signal transmission wire and transmits pH value data to the microprocessor in real time.
The dissolved oxygen on-line monitoring sensor is positioned in the water body on the inner side walls of the facultative tank and the aerobic tank, is connected with the microprocessor through a signal transmission wire, and sends dissolved oxygen data of the facultative tank and the aerobic tank to the microprocessor in real time.
2) The method for treating the rare earth wastewater comprises the following steps:
(1) The high-pollution ammonia nitrogen wastewater to be treated converged in the mining area is conveyed into the facultative tank through an ammonia nitrogen wastewater suction pump and an ammonia nitrogen wastewater water conveying pipe of the ammonia nitrogen wastewater conveying system, meanwhile, the photosynthetic autotrophic mixed bacterial liquid is synchronously injected into the facultative tank through a mixed bacterial liquid conveying pipe of the bacterial liquid adding system, and the volume ratio of the ammonia nitrogen wastewater to the photosynthetic autotrophic mixed bacterial liquid is 1:0.2 to 0.5.
(2) After the facultative tank is filled with the mixed bacterial liquid of ammonia nitrogen wastewater to be treated and photoautotrophic, the aeration mixing device is started to continuously ventilate and stir the water body in the facultative tank and mix evenly.
(3) After ventilation stirring for 10-20 minutes, starting a monitoring control system to measure the pH value, oxygen content and water temperature of the water body in the facultative tank. Wherein the water temperature is 18 ℃ to 35 ℃, the oxygen content is 1.0-2 mg/L, pH value is more than or equal to 6, and the water temperature is in a normal range, and meets the treatment requirement.
When the water temperature of the water body is low in winter, the monitoring control system starts the electric heater to increase the water temperature;
the aeration flow is regulated in real time within the range of 1.0-2 mg/L according to the required oxygen content;
when the pH value is less than 6, lime water or sodium bicarbonate aqueous solution is added for adjustment.
(4) After the water body index in the facultative tank meets the requirement, continuously ventilating and stirring, continuously ventilating for 10-100 hours, continuously injecting ammonia nitrogen wastewater to be treated into the facultative tank, and controlling the flow through an ammonia nitrogen wastewater flow regulating valve of an ammonia nitrogen wastewater conveying system.
Setting the ammonia nitrogen concentration in the ammonia nitrogen wastewater to be treated as NQ (mg/L), setting the ammonia nitrogen concentration in the tail water after treatment as NH (mg/L), and continuously injecting the flow rate of the ammonia nitrogen wastewater to be treated according to the ammonia nitrogen concentration discharge index requirement of the tail water to the flow rate of the ammonia nitrogen wastewater to be treated in a daily injection mixotrophic tank as follows:
wherein the volume V is the total volume of the treatment tank.
(5) In the process of continuously injecting ammonia nitrogen wastewater to be treated into the facultative tank, water in the facultative tank overflows into the anaerobic tank through the primary overflow pipe, and after the anaerobic tank is also full, water in the anaerobic tank overflows into the aerobic tank through the secondary overflow pipe.
(6) When water enters the anaerobic tank or the aerobic tank, the aeration mixing device arranged in the anaerobic tank and the aerobic tank is automatically started to continuously stir the water by ventilation, and meanwhile, the control system also tracks and monitors the pH value and the water temperature data of the water in the anaerobic tank and the pH value, the oxygen content and the water temperature data of the water in the aerobic tank in real time.
When the ammonia nitrogen content of the facultative tank is more than or equal to 100mg/L, or the ammonia nitrogen content of the anaerobic tank is more than or equal to 50mg/L, or the ammonia nitrogen content of the aerobic tank is more than or equal to 20mg/L, the bacterial liquid adding system automatically injects a unit volume of photoautotrophic mixed bacterial liquid into the corresponding treatment tank, and each injection is a fixed unit volume until the ammonia nitrogen content in the treatment tank is lower than a set index.
The unit volume of the photoautotrophic mixed bacterial liquid is 3% of the corresponding treatment pool by volume.
When the pH value of the water bodies of the facultative tank, the anaerobic tank and the aerobic tank is less than 6.0, starting a conveying pump of the pH adjusting agent in the pH adjusting agent adding system to inject lime water or sodium bicarbonate water solution into the water bodies in the corresponding treatment tanks so as to adjust the pH value; when the pH reaches 6.0, the addition of the pH adjusting solution is stopped.
When the oxygen content of the facultative tank and the aerobic tank is lower than 1.0mg/L or higher than 2.0mg/L, the aeration mixing device increases or decreases the aeration quantity of the corresponding treatment tank.
When the water temperature of the facultative tank, the anaerobic tank or the aerobic tank is lower than 18 ℃, the electric heater is started to increase the water temperature.
(7) And (3) the ammonia nitrogen wastewater to be treated in the aerobic tank is discharged outwards to reach the standard through a tail water discharge pipe of the aerobic tank.
Through detection, the ammonia nitrogen content in the finally treated rare earth mining wastewater is as low as 4mg/L, and the highest ammonia nitrogen content is only 12mg/L, which is superior to the 15mg/L emission requirement of the national emission Standard of rare earth industrial pollutants (GB 26451-2011).
The photosynthetic autotrophic bacteria liquid is prepared from autotrophic bacteria and heterotrophic bacteria according to a proportion of 1:0.1 to 0.7 by volume ratio.
The autotrophic bacteria are formed by mixing chlorella, scenedesmus, spirulina, rhodococcus and rhodococcus according to the equal volume ratio.
The heterotrophic bacteria are formed by mixing rhodospirillum and green spirillum according to the equal volume ratio.
The chlorella, scenedesmus, rhodococcus and rhodococcus are cultivated in BG11 medium, and the spirulina is cultivated in Zarouk medium.
The photosynthetic bacteria such as rhodospirillum and green spirillum are cultured by the following formula: NH (NH) 4 C1 1.0g，CH 3 COONa3.5g，MgC1 2 0.1g，CaC1 2 0.1g，KH 2 PO 4 0.6g，K 2 HPO 4 0.4g, yeast extract 0.1g, 1000mI water, pH7.2.
By adopting the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the ammonia nitrogen on-line monitoring sensor, the pH value on-line monitoring sensor and the dissolved oxygen on-line monitoring sensor which are assembled in the treatment system are adopted, so that the change of the water index in the treatment tank is effectively monitored in the whole process in real time.
2. The invention adopts the mode of outdoor setting of the pool, can be according to the space condition of the mining area, and has low construction cost and convenient popularization and application.
3. The microbial treatment method provided by the invention has extremely obvious effect, and the treated ammonia nitrogen index can be reduced to 4mg/L, and only reaches 12mg/L at the highest, thereby meeting the requirements of the national emission standard of rare earth industrial pollutants (GB 26451-2011).
4. As no additional sugar (carbon source) is needed in the treatment process, the ton treatment cost of wastewater is extremely low, which is only about one tenth of that of the current glucose adding method, the benefit is extremely remarkable, and the popularization and the application are more convenient.
Drawings
The invention is further illustrated by the following description in conjunction with the accompanying drawings and detailed description:
FIG. 1 is a schematic diagram of a microorganism treatment system according to the present invention;
FIG. 2 is a top view of a microbiological treatment system according to the present invention;
FIG. 3 is a schematic diagram of a highly contaminated ammonia nitrogen wastewater delivery system to be treated;
FIG. 4 is a schematic diagram of the design principle of the aeration mixing device according to the present invention;
FIG. 5 is a schematic diagram of the design principle of the autotrophic mixed bacteria liquid adding system according to the invention;
FIG. 6 is a schematic diagram of the design principle of the pH adjusting agent adding system according to the invention;
FIG. 7 is a schematic view of a heating rod further provided on the bottom surface of the wastewater treatment tank according to the present invention;
fig. 8 is a schematic diagram of the working principle of the monitoring system and the controller in the monitoring control system according to the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the accompanying drawings, which are used by way of illustration.
In fig. 1, a is an ammonia nitrogen wastewater conveying system to be treated with high pollution; b is an autotrophic mixed bacterial liquid adding system; c is a pH adjusting agent addition system; d is an aeration mixing device; 1 is a concurrently raising pool; 2 is a first-level overflow pipe; 3 is an anaerobic tank; 4 is a secondary overflow pipe; 5 is an aerobic tank; and 6, a tail water discharge pipe after treatment.
Figure 2 shows the course of the water flow. In the figure, 1 is a facultative tank; 2 is a first-level overflow pipe; 3 is an anaerobic tank; 4 is a secondary overflow pipe; 5 is an aerobic tank; and 6, a tail water discharge pipe after treatment.
In fig. 3, 7 is an ammonia nitrogen wastewater water pump; 8 is an ammonia nitrogen wastewater delivery pipe; and 9 is an ammonia nitrogen wastewater flow regulating valve.
In fig. 4, 10 is a blower; 11 is a gas automatic control diverter valve; 12 are aeration pipes which are respectively arranged at the bottoms of the facultative tank (1) and the anaerobic tank (3); 12-1 is an aeration hole positioned at the bottom of the aerobic tank (5); and 13 is a gas pipe, is divided into three paths from the gas automatic control flow dividing valve (11), respectively enters the bottoms of the regulating tank (1), the anaerobic tank (3) and the aerobic tank (5), and is connected with the aeration pipe (12) and the aeration disc (12-1).
In FIG. 5, reference numeral 14 denotes a mixed bacterial liquid transport pipe, and the mixed bacterial liquid transport pipe (14) is opened to the facultative tank (1), the anaerobic tank (3) and the aerobic tank (5), respectively; 15 is an automatic control shunt flowmeter for the mixed bacterial liquid; 16 is a mixed bacterial liquid conveying water pump; and 17 is a mixed bacterial liquid storage tank.
In fig. 6, 18 is a pH adjusting agent reservoir; 19 is a delivery pump for the pH adjusting agent; 20 is an automatically controlled diverter valve for a pH adjusting agent; 21 is a conveying pipe, the pH adjusting agent is divided into three paths after being automatically controlled by a flow dividing valve (20) and respectively enters an adjusting tank (1), an anaerobic tank (3) and an aerobic tank (5); 22 is a flow meter.
In FIG. 7, 1 is a facultative tank; 2 is a first-level overflow pipe; 3 is an anaerobic tank; 4 is a secondary overflow pipe; 5 is an aerobic tank; 6 is a tail water discharge pipe after treatment; 23 is a heating rod, and 3-8 treatment tanks are arranged in each treatment tank according to the actual seasonal air temperature change range of the area where the mining area is located and the volume of the treatment tank; 24 is a 220 volt ac power cord.
In FIG. 8, 25 is an ammonia nitrogen on-line monitoring sensor which is respectively arranged on the side walls of the facultative tank (1), the anaerobic tank (3) and the aerobic tank (5); 26 is an on-line pH value monitoring sensor which is respectively arranged on the side walls of the facultative tank (1), the anaerobic tank (3) and the aerobic tank (58); and 27 is an on-line dissolved oxygen monitoring sensor which is respectively arranged on the side walls of the regulating tank (3) and the aerobic tank (5).
Example 1
1. Preparation of autotrophic mixed bacteria liquid
Mixing Chlorella, scenedesmus, spirulina, chlorella and Haematococcus according to equal volume ratio, and making into autotrophic bacteria mixed solution;
respectively taking rhodospirillum and green spirillum, and mixing according to an equal volume ratio to prepare heterotrophic bacteria mixed solution;
autotrophic bacteria mixed liquor and heterotrophic bacteria mixed liquor according to the following formula 1: mixing at a volume ratio of 0.5 to obtain autotrophic mixed bacteria liquid. And (5) enough standby.
2. preparation of pH-adjusting agent
Quicklime and water were mixed according to 1:10 mass ratio and mixing and dissolving. And (5) enough standby.
3. System for treating rare earth wastewater
As shown in fig. 1, in the treatment tank: the specifications of the concurrently raising tank (1), the anaerobic tank (3) and the aerobic tank (5) are 20M (length) ×14M (width) ×3.2mm (height); the height from the bottom of the concurrently raising pond (1) to the first-level upper overflow pipe (2) is 3M; the height from the bottom of the anaerobic tank (3) to the secondary overflow pipe (4) is 2.9M; the height from the bottom of the aerobic tank (5) to the tail water discharge pipe (6) is 2.8M. The concurrent pool (1) is connected with the anaerobic pool (3), the anaerobic pool (3) and the aerobic pool (5) through a primary upper overflow pipe (2) and a secondary upper overflow pipe (4), and a natural horizontal drop is formed from the water surface heights of the concurrent pool (1), the anaerobic pool (3) and the aerobic pool (5).
The effective total volume of the treatment tank was 20M (length) ×14M (width) ×2.9M (height) ×3=2436M 3, and the volume of the concurrently supported tank (1) was 20M (length) ×14M (width) ×3M (height) =840M 3.
4. Treatment of ammonia nitrogen wastewater
1) And extracting the relatively concentrated high-pollution ammonia nitrogen wastewater to be treated in the mining area, and detecting the ammonia nitrogen concentration. According to measurement, the concentration (NQ) of the ammonia nitrogen wastewater to be treated extracted in the embodiment is as follows: 1200mg/L. The embodiment sets the tail water discharge index as: :12mg/L.
2) The relatively concentrated high-pollution ammonia nitrogen wastewater to be treated in the 560M3 rare earth mining area is conveyed to the vehicle-mounted treatment system facultative tank (1) through the external water pump, and meanwhile, 280M3 photoautotrophic mixed bacteria liquid is synchronously injected into the facultative tank (1) through the bacteria liquid adding system, and the proportion is 10:5.
3) After the facultative tank (1) is filled with the ammonia nitrogen wastewater to be treated and the photosynthetic autotrophic mixed bacteria liquid, the aeration mixing device (D) is started to continuously aerate and stir the water body in the facultative tank (1) and mix evenly.
4) After ventilation for 20 minutes, a monitoring control system is started to measure the pH value, the oxygen content and the water temperature of the water body in the facultative tank (1), wherein the data is that the water temperature is 28 ℃, the oxygen content is 1.8mg/L, pH and is equal to 8.4, the oxygen content belongs to a normal range, and the treatment requirement is met.
5) After the water index in the facultative tank (1) meets the requirement, the aeration is continuously carried out, the aeration treatment is carried out for 72 hours, and the ammonia nitrogen content in the facultative tank is 89mg ∈And L, starting to continuously and continuously inject ammonia nitrogen wastewater to be treated into the facultative tank (1). According to the technical scheme, the method comprises the following steps:the calculated amount is 243.6M3 (flow: 10.15M3/h) of the daily injection of ammonia nitrogen wastewater to be treated.
6) In the process of continuously injecting ammonia nitrogen wastewater to be treated into the facultative tank (1), water in the facultative tank (1) overflows into the anaerobic tank (3) through the primary overflow pipe (2), and after the anaerobic tank (3) is also filled, water in the anaerobic tank (3) overflows into the aerobic tank (5) through the secondary overflow pipe (4).
When the anaerobic tank (3) or the aerobic tank (5) has water body, the ventilation mixing device (D) arranged in the anaerobic tank (3) and the aerobic tank (5) is automatically started to continuously ventilate and stir the water body, and meanwhile, the control system also tracks and monitors the pH value and water temperature data of the water body in the anaerobic tank (3) and the pH value, oxygen content and water temperature data of the water body in the aerobic tank (5) in real time.
7) The water body in the aerobic tank (5) is discharged to the outside through a tail water discharge pipe (6).
Through real-time monitoring, in the whole flow, the ammonia nitrogen concentration of the tail water after being discharged outwards through the tail water discharge pipe (6) is always stabilized between 7 and 11mg/L, and 9.4mg/L on average, thereby reaching the discharge index set by the embodiment and being better than the requirement of 15mg/L of the national emission standard of rare earth industrial pollutants (GB 26451-2011).
The strains in the autotrophic bacteria and the heterotrophic bacteria are outsourcing, and the bacterial liquid is cultured by itself.
Experimental place of this example: experimental site of this example: the rare earth development limited company Wu Ping of Longyan city of Fujian covers the recovery mine.
The implementation start time of this embodiment: 5-6 months in 2019.
Example 2
1. Preparation of autotrophic mixed bacteria liquid
Mixing Chlorella, scenedesmus, spirulina, chlorella and Haematococcus according to equal volume ratio, and making into autotrophic bacteria mixed solution;
respectively taking rhodospirillum and green spirillum, and mixing according to an equal volume ratio to prepare heterotrophic bacteria mixed solution;
autotrophic bacteria mixed liquor and heterotrophic bacteria mixed liquor according to the following formula 1: mixing the mixture in a volume ratio of 0.7 to prepare the autotrophic mixed bacteria liquid. And (5) enough standby.
2. preparation of pH-adjusting agent
The pH adjusting agent adopts sodium bicarbonate aqueous solution with the mass concentration of 12 percent.
3. System for treating rare earth wastewater
As shown in fig. 1, in the treatment tank: the specifications of the concurrently raising tank (1), the anaerobic tank (3) and the aerobic tank (5) are 20M (length) ×14M (width) ×3.2mm (height); the height from the bottom of the concurrently raising pond (1) to the first-level upper overflow pipe (2) is 3M; the height from the bottom of the anaerobic tank (3) to the secondary overflow pipe (4) is 2.9M; the height from the bottom of the aerobic tank (5) to the tail water discharge pipe (6) is 2.8M. The concurrent pool (1) is connected with the anaerobic pool (3), the anaerobic pool (3) and the aerobic pool (5) through a primary upper overflow pipe (2) and a secondary upper overflow pipe (4), and a natural horizontal drop is formed from the water surface heights of the concurrent pool (1), the anaerobic pool (3) and the aerobic pool (5).
The effective total volume of the treatment tank was 20M (length) ×14M (width) ×2.9M (height) ×3=2436M 3, and the volume of the concurrently supported tank (1) was 20M (length) ×14M (width) ×3M (height) =840M 3.
4. Treatment of ammonia nitrogen wastewater
1) And extracting the relatively concentrated high-pollution ammonia nitrogen wastewater to be treated in the mining area, and detecting the ammonia nitrogen concentration. According to measurement, the concentration (NQ) of the ammonia nitrogen wastewater to be treated extracted in the embodiment is as follows: 800mg/L. The embodiment sets the tail water discharge index as: 12mg/L.
2) The relatively concentrated high-pollution ammonia nitrogen wastewater to be treated in the 600M3 rare earth mining area is conveyed to the vehicle-mounted treatment system facultative tank (1) through the external water pump, and meanwhile, 240M3 photoautotrophic mixed bacteria liquid is synchronously injected into the facultative tank (1) through the bacteria liquid adding system, and the proportion is 10:4.
3) After the facultative tank (1) is filled with the ammonia nitrogen wastewater to be treated and the photosynthetic autotrophic mixed bacteria liquid, the aeration mixing device (D) is started to continuously aerate and stir the water body in the facultative tank (1) and mix evenly.
4) After ventilation for 20 minutes, a monitoring control system is started to measure the pH value, the oxygen content and the water temperature of the water body in the facultative tank (1), wherein the data is that the water temperature is 17 ℃, the oxygen content is 1.5mg/L, pH value and is equal to 9.0, and the oxygen content belongs to a normal range and meets the treatment requirement;
because the water temperature is lower than 17 ℃, an electric heater in the facultative tank (1) is started at the moment, the water temperature is increased to 22 ℃, and the treatment requirement is met.
5) After the water body index in the facultative tank (1) meets the requirement, ventilation is continuously carried out, the ventilation treatment is continuously carried out for 65 hours, and when the ammonia nitrogen content in the facultative tank is 76mg/L, the ammonia nitrogen wastewater to be treated is continuously and uninterruptedly injected into the facultative tank (1). According to the technical scheme, the method comprises the following steps:the calculated amount is 365.4M3 (flow: 15.25M3/h) of the daily injection of ammonia nitrogen wastewater to be treated.
6) In the process of continuously injecting ammonia nitrogen wastewater to be treated into the facultative tank (1), water in the facultative tank (1) overflows into the anaerobic tank (3) through the primary overflow pipe (2), and after the anaerobic tank (3) is also filled, water in the anaerobic tank (3) overflows into the aerobic tank (5) through the secondary overflow pipe (4);
when the anaerobic tank (3) or the aerobic tank (5) has water body, the ventilation mixing device (D) arranged in the anaerobic tank (3) and the aerobic tank (5) is automatically started to continuously ventilate and stir the water body, and meanwhile, the control system also tracks and monitors the pH value and water temperature data of the water body in the anaerobic tank (3) and the pH value, oxygen content and water temperature data of the water body in the aerobic tank (5) in real time.
7) The water body in the aerobic tank (5) is discharged to the outside through a tail water discharge pipe (6).
Through real-time monitoring, in the whole flow, the ammonia nitrogen concentration of the tail water after being discharged outwards through the tail water discharge pipe (6) is always stabilized between 7 and 12.9mg/L, and the average ammonia nitrogen concentration is 11.4mg/L, so that the discharge index set in the embodiment is achieved, and the requirement of 15mg/L of the national emission standard of rare earth industrial pollutants (GB 26451-2011) is better than that of the national emission standard of rare earth industrial pollutants.
The strains in the autotrophic bacteria and the heterotrophic bacteria are outsourcing, and the bacterial liquid is cultured by itself.
Experimental place of this example: experimental site of this example: the rare earth development limited company Wu Ping of Longyan city of Fujian covers the recovery mine.
The implementation start time of this embodiment: 3 to 4 months in 2019.
While particular embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only, and that various changes and modifications may be made to this embodiment without departing from the spirit and scope of the invention, but these changes and modifications are within the scope of the invention.
Claims (6)
1. A method for treating rare earth wastewater by using scale outdoor pool microorganisms is characterized by comprising the following steps:
1) And (3) a rare earth wastewater treatment system:
the rare earth wastewater treatment system consists of an ammonia nitrogen wastewater conveying system to be treated, a wastewater treatment tank, an aeration mixing device, a bacterial liquid adding system, a pH adjusting agent adding system and a monitoring control system, wherein the bacterial liquid system and the pH adjusting agent adding system are sequentially distributed on the wastewater treatment tank, and the temperature control system and the aeration mixing device are distributed on the bottom of the wastewater treatment tank;
the aeration mixing device, the pH adjusting agent adding system and the bacterial liquid adding system are indirectly connected with the treatment tank through corresponding gas pipes, transfusion pipes and conveying pipes respectively; the monitoring control system consists of a monitoring system and a controller, wherein an ammonia nitrogen on-line monitoring sensor, a pH value on-line monitoring sensor and a dissolved oxygen on-line monitoring sensor in the monitoring system are arranged on the inner side wall of the wastewater treatment tank;
the microprocessor is respectively connected with the ammonia nitrogen on-line monitoring sensor, the pH value on-line monitoring sensor and the dissolved oxygen on-line monitoring sensor, and is used for regularly receiving ammonia nitrogen content, pH value and dissolved oxygen data of each sensor, and the microprocessor is connected with the bacterial liquid adding system, the ventilation mixing device and the pH adjusting agent adding system;
2) The method for treating the rare earth wastewater comprises the following steps:
(1) The high-pollution ammonia nitrogen wastewater to be treated converged in the mining area is conveyed into the facultative tank through an ammonia nitrogen wastewater suction pump and an ammonia nitrogen wastewater water conveying pipe of the ammonia nitrogen wastewater conveying system, meanwhile, the photosynthetic autotrophic mixed bacterial liquid is synchronously injected into the facultative tank through a mixed bacterial liquid conveying pipe of the bacterial liquid adding system, and the volume ratio of the ammonia nitrogen wastewater to the photosynthetic autotrophic mixed bacterial liquid is 1:0.2 to 0.5;
(2) After the facultative tank is filled with the ammonia nitrogen wastewater to be treated and the photoautotrophic mixed bacterial liquid, starting an aeration mixing device to continuously ventilate and stir the water body in the facultative tank and uniformly mix the water body;
(3) After ventilation stirring for 10-20 minutes, starting a monitoring control system to measure the pH value, oxygen content and water temperature of the water body in the facultative tank; wherein the water temperature is 18 ℃ to 35 ℃, and the oxygen content is 1.0-2 mg/L, pH value is more than or equal to 6;
(4) After the water body index in the facultative tank meets the requirement, continuously ventilating and stirring, continuously ventilating for 10-100 hours, and continuously injecting ammonia nitrogen wastewater to be treated into the facultative tank, wherein the flow is controlled through an ammonia nitrogen wastewater flow regulating valve of an ammonia nitrogen wastewater conveying system;
(5) In the process of continuously injecting ammonia nitrogen wastewater to be treated into the facultative tank, water in the facultative tank overflows into the anaerobic tank through the primary overflow pipe, and after the anaerobic tank is also filled, water in the anaerobic tank overflows into the aerobic tank through the secondary overflow pipe;
(6) When water enters the anaerobic tank or the aerobic tank, the aeration mixing device arranged in the anaerobic tank and the aerobic tank is automatically started to continuously stir the water by introducing air, and meanwhile, the control system also tracks and monitors the pH value and the water temperature data of the water in the anaerobic tank and the pH value, the oxygen content and the water temperature data of the water in the aerobic tank in real time;
when the ammonia nitrogen content of the facultative tank is more than or equal to 100mg/L, or the ammonia nitrogen content of the anaerobic tank is more than or equal to 50mg/L, or the ammonia nitrogen content of the aerobic tank is more than or equal to 20mg/L, the bacterial liquid adding system automatically injects a unit volume of photoautotrophic mixed bacterial liquid into the corresponding treatment tank, and each injection is a fixed unit volume until the ammonia nitrogen content in the treatment tank is lower than a set index;
(7) The ammonia nitrogen wastewater to be treated in the aerobic tank is discharged outwards to reach the standard through a tail water discharge pipe of the aerobic tank;
3) A photosynthetic autotrophic bacteria liquid, which is prepared from autotrophic bacteria and heterotrophic bacteria according to a proportion of 1:0.1 to 0.7 by volume ratio;
the autotrophic bacteria are formed by mixing chlorella, scenedesmus, spirulina, rhodococcus and haematococcus according to the equal volume ratio;
the heterotrophic bacteria are formed by mixing rhodospirillum and green spirillum according to the equal volume ratio;
a unit volume of photoautotrophic mixed bacterial liquid is 3% of the corresponding treatment pool by volume;
the chlorella, scenedesmus, rhodococcus and rhodococcus are cultivated by BG11 medium, and the spirulina is cultivated by Zarouk's medium;
the rhodospirillum and the green spirillum are cultured by the following formula: NH (NH) 4 C1 1 .0g，CH 3 COONa 3 .5g，MgC1 2 0.1g，CaC1 2 0.1g，KH 2 PO 4 0.6g，K 2 HPO 4 0.4g, yeast extract 0.1g, 1000mI of water, pH 7.2;
the monitoring system consists of an ammonia nitrogen on-line monitoring sensor, a pH value on-line monitoring sensor and a dissolved oxygen on-line monitoring sensor; the microprocessor is respectively connected with the ammonia nitrogen on-line monitoring sensor, the pH value on-line monitoring sensor and the dissolved oxygen on-line monitoring sensor, receives ammonia nitrogen content, pH value and dissolved oxygen data of each sensor at regular time, and determines whether to start a pH adjusting medicament input pump in the pH adjusting medicament adding system and a blower in the ventilation mixing device according to the obtained data;
meanwhile, the pH value on-line monitoring sensor monitors the pH value in real time, and once the exceeding microprocessor is found, the pH regulating agent is controlled to be added to correct the pH value;
the ammonia nitrogen on-line monitoring sensor is positioned in the water body on the inner side walls of the facultative tank, the anaerobic tank and the aerobic tank treatment tank, is connected with the microprocessor through a signal transmission wire, sends concentration data to the microprocessor in real time, when the ammonia nitrogen concentration value reaches a set value, the microprocessor sends out an instruction, the bacteria liquid infusion pump is started, the bacteria liquid adding system automatically injects a unit volume of photoautotrophic mixed bacteria liquid into the corresponding treatment tank, and the bacteria liquid concentration and the action capacity in the water body of the treatment tank are improved.
2. The method for treating rare earth wastewater by using scale outdoor pool microorganisms according to claim 1,
the sewage treatment device is characterized in that the sewage treatment tank is formed by serially connecting a facultative tank, an anaerobic tank and an aerobic tank, the inner side surface of the treatment tank is subjected to anti-seepage treatment, and the facultative tank and the anaerobic tank are connected through a primary overflow pipe and a secondary overflow pipe in a diagonal range.
3. The method for treating rare earth wastewater by using scale outdoor pool microorganisms according to claim 1,
the aeration mixing device is characterized by comprising an air blower, an air pipe, an aeration disc and air holes, wherein the aeration disc is distributed at the bottoms of the facultative tank and the anaerobic tank, and the air holes are arranged at the bottom of the aerobic tank; the gas pipe is respectively connected with the aeration disc and the gas hole at the bottoms of the facultative tank, the anaerobic tank and the aerobic tank through the automatic control diverter valve;
the method for treating the rare earth wastewater by the microorganisms in the large-scale outdoor pool is characterized in that a plurality of water body temperature heating rods are further arranged on the bottom surface of the wastewater treatment pool in the system for treating the rare earth wastewater, and the water body temperature is increased by electrifying and heating; the bacterial liquid adding system consists of a bacterial liquid tank, an automatic control flow dividing valve, a flowmeter and a liquid conveying pipe, wherein the liquid conveying pipe connected with the automatic control flow dividing valve is respectively opened in the facultative tank, the anaerobic tank and the aerobic tank; the pH adjusting agent adding system consists of a pH adjusting agent storage tank, a delivery pump, a delivery pipe and a flowmeter, wherein an automatic control flow dividing valve is arranged in the delivery pipe, and the delivery pipe is respectively opened in the facultative tank, the anaerobic tank and the aerobic tank through the automatic control flow dividing valve.
4. The method for treating rare earth wastewater by using scale outdoor pool microorganisms according to claim 1,
the system is characterized in that the monitoring control system consists of a monitoring system and a controller, and the controller is connected with the bacterial liquid adding system, the aeration mixing device and the pH adjusting agent adding system; the controller is provided with a microprocessor, wherein the microprocessor internally comprises a memory and an analog-to-digital converter, or the memory and the analog-to-digital converter are expanded outside the microprocessor according to the requirement.
5. The method for treating rare earth wastewater by using the large-scale outdoor pool microorganisms according to claim 1, wherein the pH value on-line monitoring sensor is positioned in a water body on the inner side wall of the tail water treatment pool and is connected with the microprocessor through a signal transmission wire, and pH value data is sent to the microprocessor in real time; the dissolved oxygen on-line monitoring sensor is positioned in the water body on the inner side walls of the facultative tank and the aerobic tank, is connected with the microprocessor through a signal transmission wire, and sends dissolved oxygen data of the facultative tank and the aerobic tank to the microprocessor in real time.
6. The method for treating rare earth wastewater by using scale outdoor pool microorganisms according to claim 1,
the method is characterized in that in the process of continuously injecting ammonia nitrogen wastewater to be treated into the facultative tank, the ammonia nitrogen concentration in the ammonia nitrogen wastewater to be treated is set to be NQ, the ammonia nitrogen concentration in tail water after treatment is NH, and according to the ammonia nitrogen concentration emission index requirement of the tail water, the flow rate of continuously injecting the ammonia nitrogen wastewater to be treated is set as the flow rate of continuously injecting the ammonia nitrogen wastewater to be treated into the facultative tank every day, wherein the volume V is the total volume of the treatment tank.
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| CN115259401A (en) * | 2022-07-29 | 2022-11-01 | 福州文泽生物科技有限公司 | Rare earth mining ammonia nitrogen wastewater in-situ treatment microorganism preparation and automatic inoculation equipment |
| CN115259400A (en) * | 2022-07-29 | 2022-11-01 | 福州文泽生物科技有限公司 | Ammonia nitrogen in-situ treatment method for rare earth mining by using liquid injection and collection system |
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