CN209411899U - A device for removing high-concentration nitrate in low-temperature groundwater - Google Patents

Abstract

A device for removing high-concentration nitrate in low-temperature groundwater relates to the field of water treatment, in particular to a device for removing nitrate in groundwater. It is to solve the problem that the existing device has poor nitrate removal effect for low-temperature groundwater. The device includes a water inlet tank, a microbial inoculation tank, a water inlet pump, a main reactor, an air pump, a backwashing device, a lifting pump, a peristaltic pump, a secondary sedimentation tank and a water outlet tank. The bottom of the main reactor is equipped with an aeration device; the middle part of the main reactor is equipped with a photocatalytic device, the water inlet tank is connected with the reactor water inlet of the main reactor through the water inlet pump, and the microbial inoculation pool is connected with the water inlet tank and the inlet The pipes between the water pumps are connected, the reactor water outlet of the main reactor is connected with the water inlet of the secondary sedimentation tank through the peristaltic pump, and the water outlet of the secondary sedimentation tank is connected with the water outlet tank through the pipeline. The utility model is used for treating ground water.

Description

A device for removing high-concentration nitrate in low-temperature groundwater

technical field

The utility model relates to the field of water treatment, in particular to a device for removing nitrate in groundwater.

Background technique

In recent decades, with the rapid development of my country's economy and society, the development and utilization of groundwater resources has shown a rapid growth trend. It is generally polluted by non-point sources of agricultural nitrogen, and nitrate pollution in groundwater is becoming more and more serious. According to my country's sanitary standards for drinking water, nitrate in drinking water should not exceed 10mg/L. Excessive nitrate content in drinking water can easily lead to methemoglobinemia on the one hand, and on the other hand can form nitrosamines and nitrosamides in the stomach, which are highly carcinogenic and may also cause teratogenicity and mutagenesis, threatening the human body healthy.

Traditional biological denitrification technology is generally considered as one of the preferred methods to remove nitrate nitrogen from drinking water because of its good treatment effect, low operating cost, and easy operation and maintenance. Because the water temperature of groundwater is usually low (6-10°C), and the organic matter in the water usually exists in the form of humic acid, which is difficult to biodegrade, so when using traditional biological denitrification technology to treat groundwater, low temperature often inhibits the growth of denitrifying bacteria and The question of activity. And then affect the nitrate removal effect.

Utility model content

The utility model aims to solve the problem that the existing device has poor nitrate removal effect on low-temperature groundwater, and provides a device for removing high-concentration nitrate in low-temperature groundwater.

The utility model removes high-concentration nitrate in low-temperature groundwater, including a water inlet tank, a microbial inoculation tank, a water inlet pump, a main reactor, an air pump, a backwashing device, a lift pump, a peristaltic pump, a secondary settling tank and a water outlet tank.

The lower part of one side wall of the main reactor is provided with a reactor water inlet, the lower part of the other side side wall of the main reactor is provided with a reactor water outlet, and the bottom of the main reactor is provided with an aeration device, and the air pump is passed through the pipe. The bottom of the main reactor is connected to the aeration device, and the connection between the air pump and the main reactor is sealed;

The middle part of the main reactor is equipped with a photocatalytic device. The photocatalytic device includes a left support frame, a right support frame, a flat membrane module, a photocatalyst coated glass and an ultraviolet lamp group. Between the left support frame and the right support frame There are flat-plate membrane modules, photocatalyst-coated glass and ultraviolet lamps set vertically between them, wherein the flat-plate membrane modules are perpendicular to the left support frame and the right support frame, and two pieces of photocatalyst-coated glass are respectively arranged on both sides of the flat-plate membrane components , and parallel to the flat membrane module, two UV lamp tube groups are respectively arranged on the outside of two pieces of photocatalyst-coated glass, and parallel to the photocatalyst-coated glass;

The flat membrane module in the photocatalytic device is connected to the water outlet of the backwashing device through a backwashing pipe, and a lift pump is arranged on the backwashing pipe;

The water inlet tank is connected to the reactor water inlet of the main reactor through the water inlet pump, the microbial inoculation tank is connected to the pipeline between the water inlet tank and the water inlet pump, and the reactor water outlet of the main reactor is connected to the inlet of the secondary sedimentation tank through a peristaltic pump. The water outlet is connected, and the water outlet of the secondary settling tank is connected with the water outlet tank through the pipeline;

A water inlet valve is arranged at the outlet of the water inlet tank, and an inoculation pond valve is arranged at the outlet of the microbial inoculation pond.

Further, the aeration device is an aeration tube.

Further, the photocatalyst-coated glass is prepared by coating the photocatalyst on the surface of the glass by using a coating method. For the specific coating method, see "Preparation and Sterilization Performance of Glass-Based Nanocomposite TiO ₂ Photocatalytic Film" (Wang Xun. Wuhan University of Technology, 2008.). The catalyst is TiO ₂ , ZnO, CdS, WO ₃ , SnO ₂ or BiVO ₄ .

Further, the coating of the photocatalyst-coated glass is only arranged on the side close to the ultraviolet lamp group, the purpose is to strengthen the photocatalytic reaction effect; the photocatalyst coating is not provided on the side of the photocatalyst-coated glass close to the flat membrane assembly , the purpose is to prevent photocatalytic oxidation from affecting the microorganisms on the membrane.

Further, a valve is provided on the pipeline between the air pump and the aeration device, a valve is provided on the pipeline between the reactor water outlet and the peristaltic pump, and a valve is provided on the pipeline between the backwashing device and the lifting pump. A valve is arranged on the pipeline between the settling tank and the water outlet tank.

Further, a first flowmeter is arranged at the water inlet of the reactor, and a second flowmeter is arranged on the backwashing pipe.

The working principle of the utility model device:

First, denitrifying bacteria are introduced into the main reactor, which is composed of low-temperature denitrifying bacteria and low-temperature facultative autotrophic denitrifying bacteria, which can denitrify and remove nitrate. Turn on the air pump to aerate the aeration device to form a biofilm on the flat membrane module, and then carry out groundwater treatment. The groundwater enters the main reactor from the water inlet tank, and the ultraviolet lamp is turned on. The ultraviolet lamp can promote the advanced oxidation reaction of the photocatalyst (the photocatalyst is attached to the photocatalyst coated glass), and generate free radicals such as O, HO, etc., so that the groundwater Humic acids that are difficult to biodegrade are oxidized to form small molecules that are easily biodegradable organic matter, which increases the C/N ratio in the water; NO ₃ ^- -N, organic C, iron ions and manganese ions in the water are attached to the flat membrane module The microorganisms provide nutrients to promote the growth and denitrification of microorganisms; the advanced oxidation reaction further eliminates the risk of nitrite formation during treatment. The function of the peristaltic pump is to prevent the high concentration of microorganisms in the water from clogging the pipeline, so the peristaltic pump needs to be turned on when the pipeline is clogged.

The groundwater treated by the main reactor flows into the secondary settling tank for mud-water separation, and then the water enters the water outlet tank through the outlet of the secondary settling tank.

After the device has been in operation for a period of time, the flat membrane module needs to be cleaned. At this time, the lift pump and backwashing device are turned on to clean the flat membrane module regularly. When cleaning the flat membrane module, the water inlet valve should be closed to stop the operation of the device.

The device of the utility model realizes inflow and outflow of water through the suction of the water inflow pump.

The beneficial effects of the utility model:

1. The main reactor of the utility model device is provided with a photocatalytic device, wherein the flat membrane module is used for the attachment of microorganisms, and a photocatalyst coated glass and an ultraviolet lamp tube group are arranged on the outside of it, and the ultraviolet lamp can promote the photocatalyst coating. The photocatalyst on the glass surface undergoes an advanced oxidation reaction, which oxidizes humic acids that are difficult to biodegrade in groundwater to form small molecules that are easily biodegradable organic matter, providing nutrients for the microorganisms (denitrifying bacteria) attached to the flat membrane module. Promotes microbial growth and denitrification.

In the process of using the device of the utility model to treat groundwater, the advanced oxidation reaction produced by the ultraviolet light-catalyst eliminates the risk of nitrite formation during the treatment process, so there is no problem of nitrite accumulation.

2. The utility model is equipped with a microorganism inoculation pool, which is convenient for introducing microorganisms into the main reactor. An aeration device is installed in the main reactor to facilitate the attachment of microorganisms to the flat membrane module to form a biofilm.

3. The utility model is equipped with a backwashing device, which is convenient for regular cleaning of the flat membrane module.

Description of drawings

Fig. 1 is the structural representation of the device for removing high-concentration nitrate in low-temperature groundwater;

Fig. 2 is a top view of the photocatalytic device in the main reactor of the device of the present invention.

Detailed ways

The technical solution of the utility model is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments.

In the following specific embodiments, what refer to for the assay method of nitrite content is the phenolic disulfonic acid spectrophotometry and N-(1 -naphthyl)-ethylenediamine spectrophotometry.

Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1 and FIG. 2. The device for removing high-concentration nitrate in low-temperature groundwater in this embodiment includes a water inlet tank 1, a microbial inoculation pool 31, a water inlet pump 2, a main reactor 7, and an air pump. 5. Backwashing device 8, lifting pump 9, peristaltic pump 20, secondary settling tank 16 and water outlet tank 17,

The lower part of one side wall of the main reactor 7 is provided with a reactor water inlet 3, the lower part of the other side side wall of the main reactor 7 is provided with a reactor water outlet 15, and the bottom of the main reactor 7 is provided with an aeration device 14 , the air pump 5 is connected to the aeration device 14 through the bottom of the main reactor 7 through a pipeline, and the connection between the air pump 5 and the main reactor 7 is sealed;

The middle part in the main reactor 7 is provided with a photocatalytic device 6, and the photocatalytic device 6 includes a left support frame 62, a right support frame 63, a flat membrane assembly 61, a photocatalyst coated glass 10 and an ultraviolet lamp group 11. Between the left support frame 62 and the right support frame 63, a flat film assembly 61, a photocatalyst coated glass 10 and an ultraviolet lamp tube group 11 are vertically arranged, wherein the flat film assembly 61 is perpendicular to the left support frame 62 and the right support frame 63, Two pieces of photocatalyst-coated glass 10 are respectively arranged on both sides of the flat membrane assembly 61, and are parallel to the flat membrane assembly 61, and two ultraviolet lamp tube groups 11 are respectively arranged on the outside of the two pieces of photocatalyst-coated glass 10, and Photocatalyst coated glass 10 parallel;

The flat membrane assembly 61 in the photocatalytic device 6 is connected to the water outlet of the backwash device 8 through the backwash pipe 12, and the backwash pipe 12 is provided with a lift pump 9;

The water inlet tank 1 is connected with the reactor water inlet 3 of the main reactor 7 through the water inlet pump 2, the microbial inoculation tank 31 is connected with the pipeline between the water inlet tank 1 and the water inlet pump 2, and the reactor water outlet 15 of the main reactor 7 Link to each other with the water inlet of secondary sedimentation tank 16 by peristaltic pump 20, the water outlet of secondary sedimentation tank 16 links to each other with outlet tank 17 by pipeline;

The outlet of the water inlet tank 1 is provided with a water inlet valve 4, and the outlet of the microbial inoculation pool 31 is provided with an inoculation pool valve 13.

Preferably, the aeration device 14 is an aeration tube.

Further, the photocatalyst-coated glass 10 is prepared by coating a photocatalyst on the surface of the glass to obtain a photocatalyst-coated glass. For the specific coating method, see "Preparation and Sterilization Performance of Glass-Based Nanocomposite TiO ₂ Photocatalytic Film" (Wang Xun. Wuhan University of Technology, 2008.). The catalyst is TiO ₂ , ZnO, CdS, WO ₃ , SnO ₂ or BiVO ₄ .

Further, the coating of the photocatalyst-coated glass 10 is only arranged on the side close to the ultraviolet lamp group 11, the purpose is to strengthen the photocatalytic reaction effect; The purpose of the photocatalyst coating is to prevent photocatalytic oxidation from affecting the microorganisms on the membrane.

Further, a valve is provided on the pipeline between the air pump 5 and the aeration device 14, a valve is provided on the pipeline between the reactor water outlet 15 and the peristaltic pump 20, and a valve is provided on the pipeline between the backwashing device 8 and the lift pump 9. A valve is provided on the top, and a valve is provided on the pipeline between the secondary settling tank 16 and the water outlet tank 17. Setting the valve is convenient for opening and closing control of each part in the device.

Further, a first flow meter 30 is provided at the water inlet 3 of the reactor, and a second flow meter 32 is provided on the backwash pipe 12 . A flow meter is provided to facilitate monitoring of the water inflow and outflow in the device.

How the device works:

The device realizes the inflow and outflow of water through the suction of the water inflow pump.

First, denitrifying bacteria are introduced into the main reactor 7, and the air pump 5 is turned on to aerate the aeration device 14, so that a biofilm is formed on the flat membrane module 61, and then the groundwater is treated. Underground water enters the main reactor 7 from the water inlet tank 1, and the ultraviolet lamp is turned on. The ultraviolet lamp can promote the photocatalyst (photocatalyst is attached to the photocatalyst coating glass) to take place in advanced oxidation reaction, and produce free radicals such as O , HO , so that Humic acids that are difficult to biodegrade in groundwater are oxidized to form small molecules that are easily biodegradable organic matter, which increases the C/N ratio in water; NO ₃ ^- -N, organic C, iron ions and manganese ions in water form flat membrane modules The microorganisms attached to it provide nutrients to promote the growth and denitrification of microorganisms; the advanced oxidation reaction also further eliminates the risk of nitrite formation during the treatment process, so nitrate and humic acid in water can be removed at the same time, and there is no Accumulation of nitrite. The function of the peristaltic pump is to prevent the high concentration of microorganisms in the water from clogging the pipeline, so the peristaltic pump needs to be turned on when the pipeline is clogged.

The groundwater treated by the main reactor 7 flows into the secondary settling tank 16 for mud-water separation, and then the water enters the water outlet tank 17 through the water outlet of the secondary settling tank 16 .

After the device has been running for a period of time, the flat membrane module 61 needs to be cleaned. At this time, the lift pump 9 and the backwashing device 8 are turned on to clean the flat membrane module 61 regularly.

Specific embodiment two: utilize the device described in specific embodiment one to carry out the method for groundwater treatment, comprise the following steps:

1. Put the denitrifying bacterial agent into the microbial inoculation tank 31, close the water inlet valve 4, open the inoculation tank valve 13 and the water inlet pump 2, the denitrifying bacterial bacterial agent enters the main reactor 7 through the microbial inoculation tank 31, and turn on The air pump 5 and the aeration device 14 are aerated for 12 to 24 hours, so that the dissolved oxygen in the water is not lower than 2mg/L;

Two, then stop the aeration, static sedimentation for 2 to 6 hours, and then discharge the clarified water through the secondary sedimentation tank 16;

3. Repeat step 1 to step 2 until flocs are formed and a biofilm is formed on the flat membrane module 61, the thickness of the biofilm is 0.1-0.2mm;

Four, then close the valve 13 of the inoculation pool, open the water inlet valve 4 and the water inlet pump 2, the groundwater in the water inlet tank 1 enters the main reactor 7 through the reactor water inlet 3 under the lifting action of the water inlet pump 2, and open the air pump 5 and the aeration device 14, turn on the ultraviolet lamp at the same time, and the hydraulic retention time is 2 to 6 hours. After that, the treated groundwater enters the secondary sedimentation tank 16 through the reactor water outlet 15, and is discharged to the water outlet tank 17.

Further, the aeration device 14 at the bottom of the main reactor 7 adopts an intermittent aeration method, and the dissolved oxygen in the water is not lower than 2 mg/L.

Further, the preparation method of the denitrifying bacteria agent described in step 1 is carried out according to the following steps:

1. Inoculate Pseudomonas extremaustralis Y39-6, Pseudomonas arsenicoxydansY24-2, Pseudomonas poae Y5-5, Pseudomonas koreensis Y5-11 and Psychrobactercryohalolentis F5-6 in solid medium respectively, and activate them at 8°C for 36 hours;

2. The activated Pseudomonas extremaustralis Y39-6, Pseudomonas arsenicoxydans Y24-2, Pseudomonas poae Y5-5, Pseudomonas koreensis Y5-11 and Psychrobacter cryohalolentis F5-6 were respectively inoculated in liquid medium for fermentation and culture, and the temperature was 8°C. The number of bacteria of Pseudomonas extremaustralis Y39-6, Pseudomonasarsenicoxydans Y24-2, Pseudomonas poae Y5-5, Pseudomonas koreensis Y5-11 and Psychrobacter cryohalolentis F5-6 in every milliliter of fermented liquid is 10 to ¹⁰ ;

3. Pseudomonas extremaustralis Y39-6 fermentation broth, Pseudomonas arsenicoxydans Y24-2 fermentation broth, Pseudomonas poae Y5-5 fermentation broth, Pseudomonas koreensis Y5-11 fermentation broth and Psychrobacter cryohalolentis F5-6 fermentation broth in a volume ratio of 1:1:1: Mix 1:1 evenly to make denitrifying bacteria agent;

Further, the solid medium formula used for cultivating Pseudomonas extremaustralis Y39-6 and Pseudomonas koreensis Y5-11 in step 1 is: NaNO ₃ 0.5g/L, MnSO ₄ 0.05g/L, (NH ₄ ) ₂ Fe(SO ₄ ) ₂ 6H ₂ O 0.10g/L, CaCl ₂ 0.05g/L, Na ₂ HPO ₄ 0.7g/L, MgSO ₄ 7H ₂ O 0.04g/L, NaCl 0.4g/L, agar 18g/L, pH Value 7.2.

Further, the solid medium formula used to cultivate Pseudomonas arsenicoxydans Y24-2 and Psychrobacter cryohalolentis F5-6 in step 1 is: NaNO ₃ 0.5g/L, MnSO ₄ 0.05g/L, (NH ₄ ) ₂ Fe(SO ₄ ) ₂ 6H ₂ O 0.10g/L, CaCl ₂ 0.05g/L, Na ₂ HPO ₄ 0.7g/L, MgSO ₄ 7H ₂ O 0.04g/L, NaCl 0.4g/L, C ₂ H ₅ OH 0.1 ～2.0mL/L, agar 18g/L, pH 7.2.

Further, the formula of solid medium for cultivating Pseudomonas poae Y5-5 in step 1 is: NaNO ₃ 0.5g/L, MnSO ₄ 0.05g/L, (NH ₄ ) ₂ Fe(SO ₄ ) ₂ ·6H ₂ O 0.10g/L, CaCl ₂ 0.05g/L, Na ₂ HPO ₄ 0.7g/L, MgSO ₄ 7H ₂ O 0.04g/L, NaCl 0.4g/L, humic acid 0.10～10.0mg/L, agar 18g /L, pH 7.2.

Further, the formula of the liquid medium for fermenting Pseudomonas extremaustralis Y39-6 and Pseudomonas koreensis Y5-11 in step 2 is: NaNO ₃ 0.5g/L, MnSO ₄ 0.05g/L, (NH ₄ ) ₂ Fe(SO ₄ ) ₂ ·6H ₂ O 0.10g/L, CaCl ₂ 0.05g/L, Na ₂ HPO ₄ 0.7g/L, MgSO ₄ ·7H ₂ O 0.04g/L, NaCl 0.4g/L, pH 7.2.

Further, the formula of liquid medium for fermenting Pseudomonas arsenicoxydans Y24-2 and Psychrobacter cryohalolentis F5-6 in step 2 is: NaNO ₃ 0.5g/L, MnSO ₄ 0.05g/L, (NH ₄ ) ₂ Fe(SO ₄ ) ₂ 6H ₂ O 0.10g/L, CaCl ₂ 0.05g/L, Na ₂ HPO ₄ 0.7g/L, MgSO ₄ 7H ₂ O 0.04g/L, NaCl 0.4g/L, C ₂ H ₅ OH 0.1 ~2.0mL/L, pH 7.2.

Further, the liquid medium formula used for fermenting Pseudomonas poae Y5-5 in step 2 is: NaNO ₃ 0.5g/L, MnSO ₄ 0.05g/L, (NH ₄ ) ₂ Fe(SO ₄ ) ₂ ·6H ₂ O 0.10g/L, CaCl ₂ 0.05g/L, Na ₂ HPO ₄ 0.7g/L, MgSO ₄ 7H ₂ O 0.04g/L, NaCl 0.4g/L, humic acid 0.10～10.0mg/L, pH value 7.2.

Wherein the Pseudomonas extremaustralis Y39-6 is preserved in the General Microorganism Center of China Microbial Strains Preservation Management Committee, the preservation address is No. 3, No. 1, Beichen West Road, Chaoyang District, Beijing, and the preservation date is October 29, 2018. The preservation number is CGMCC No. 16652. Pseudomonas arsenicoxydans Y24-2 is preserved in the General Microbiology Center of China Microbiological Culture Collection Management Committee. The preservation address is No. 3, No. 1, Beichen West Road, Chaoyang District, Beijing. The preservation number is CGMCC No.16655, and the preservation date is October 29, 2018 day. Pseudomonas poae Y5-5 was deposited in the General Microorganism Center (CGMCC) of China Microbiological Culture Collection Management Committee (CGMCC). The preservation address is No. 3, No. 1, Beichen West Road, Chaoyang District, Beijing. CGMCC No. 16654. Pseudomonas koreensis Y5-11 was deposited in the General Microbiology Center of China Committee for the Collection of Microbial Cultures. The preservation address is No. 3, Yard 1, Beichen West Road, Chaoyang District, Beijing. The preservation date is October 29, 2018, and the preservation number is 16651. Psychrobacter cryohalolentis F5-6 was deposited in the General Microorganism Center of China Microbiological Culture Collection Management Committee. The preservation address is No. 3, No. 1, Beichen West Road, Chaoyang District, Beijing. The preservation date is October 29, 2018, and the preservation number is CGMCC No. 16653.

A biofilm of denitrifying bacterial agent is fixed on the flat membrane module, and the denitrifying bacterial agent is composed of low-temperature denitrifying bacteria and low-temperature facultative autotrophic denitrifying bacteria. Low-temperature denitrifying bacteria Pseudomonas arsenicoxydansY24-2, Pseudomonas poae Y5-5 and Psychrobacter cryohalolentis F5-6 can use organic matter for denitrification to remove nitrate (the best C/N ratio is 0.5), Pseudomonas koreansis Y5-11 and Pseudomonasextremaustralis Y39-6 Nitrate can be removed by denitrification without organic carbon source. The combination of the above strains is beneficial to strengthen the removal effect of the strains on nitrate and the adaptability to the environment. When the concentration of organic matter and nitrate in the influent fluctuates greatly, it can still ensure good removal of organic matter and nitrate Effect.

In this embodiment, the groundwater polluted by high concentration of nitrate is used as influent, the nitrate concentration is 50-100mg/L, and the method is used for treatment under the condition of 6-10°C, and the nitrate in the influent and effluent is monitored every day and nitrite concentrations. Within 30 days of operation, the removal rate of nitrate by this method is above 80%, and no nitrite accumulation is found in the effluent.

Claims (5)

1. a kind of device for removing low temperature underground water middle and high concentration nitrate, it is characterised in that the device includes inlet tank (1), micro- Bacterization pond (31), main body reactor (7), air pump (5), back purge system (8), elevator pump (9), is wriggled at intake pump (2) (20), secondary settling tank (16) and water tank (17) are pumped,

The side lower sidewall of main body reactor (7) is equipped with reactor water inlet (3), the other side side wall of main body reactor (7) Lower part is equipped with reactor water outlet (15), and the bottom in main body reactor (7) is equipped with aerator (14), and air pump (5) passes through The bottom that pipeline passes through main body reactor (7) is connected with aerator (14), the connection of air pump (5) and main body reactor (7) Place's sealing；

Middle part in main body reactor (7) is equipped with photocatalysis apparatus (6), the photocatalysis apparatus (6) include left support frame (62), Right support frame (63), plate film assembly (61), photocatalytic coating glass (10) and ultraviolet lamp tube group (11), in left support frame (62) plate film assembly (61), photocatalytic coating glass (10) and ultraviolet lamp tube are vertically arranged between right support frame (63) Group (11), wherein plate film assembly (61) is vertical with left support frame (62) and right support frame (63), two panels photocatalytic coating glass Glass (10) is respectively arranged at the two sides of plate film assembly (61), and parallel with plate film assembly (61), two ultraviolet lamp tube groups (11) it is respectively arranged at the outside of two panels photocatalytic coating glass (10), and parallel with photocatalytic coating glass (10)；

Plate film assembly (61) in the photocatalysis apparatus (6) passes through the water outlet of backwash tube (12) and back purge system (8) Mouth connects, and is provided with elevator pump (9) on backwash tube (12)；

Inlet tank (1) is connect by intake pump (2) with the reactor water inlet (3) of main body reactor (7), microbial inoculant pond (31) pipeline between inlet tank (1) and intake pump (2) is connect, and the reactor water outlet (15) of main body reactor (7) passes through Peristaltic pump (20) is connected with the water inlet of secondary settling tank (16), and the water outlet of secondary settling tank (16) passes through pipeline and water tank (17) phase Even；

The exit of inlet tank (1) is equipped with inlet valve (4), and the exit of microbial inoculant pond (31) is equipped with inoculation pond valve (13)。

2. a kind of device for removing low temperature underground water middle and high concentration nitrate according to claim 1, it is characterised in that institute Stating aerator (14) is aeration tube.

3. a kind of device for removing low temperature underground water middle and high concentration nitrate according to claim 1 or 2, it is characterised in that The coating of the photocatalytic coating glass (10) is provided only on close to the side of ultraviolet lamp tube group (11).

4. a kind of device for removing low temperature underground water middle and high concentration nitrate according to claim 3, it is characterised in that empty Pipeline between air pump (5) and aerator (14) is equipped with valve, between reactor water outlet (15) and peristaltic pump (20) Pipeline is equipped with valve, and the pipeline between back purge system (8) and elevator pump (9) is equipped with valve, secondary settling tank (16) and water outlet Pipeline between case (17) is equipped with valve.

5. a kind of device for removing low temperature underground water middle and high concentration nitrate according to claim 4, it is characterised in that institute It states and is equipped with first flowmeter (30) at reactor water inlet (3), backwash tube (12) is equipped with second flowmeter (32).