CN106186592A - A kind of device removing nitrate nitrogen in resin desorption liquid and technique for applying thereof - Google Patents

Abstract

The invention discloses a device for removing nitrate nitrogen in a resin desorption liquid and its application process, including a reactor, an aeration device, a water inlet tank and an ozone dosing device. The inner layer of the reactor with a concentric cylindrical structure is The outer layer of the ozone contact reactor is an anoxic reactor and a sludge precipitator separated by an anoxic reactor. The lower end of the ozone contact reactor is filled with ozone reaction catalytic packing, the ozone contact reactor is connected to the water inlet tank through the connecting pipe one, the ozone contact reactor is connected to the ozone dosing device through the connecting pipe two, and the device also includes an ozone collecting device, The air inlet of the ozone collection device is connected to the top of the ozone contact reactor, and the gas outlet of the ozone collection device is connected with the ozone dosing device through a connecting pipe III equipped with a circulating pump. The device in the invention has the advantages of compact structure, small occupied area, high efficiency and convenient operation.

Description

A device for removing nitrate nitrogen in resin desorption liquid and its application process

technical field

The invention relates to the field of wastewater biochemical treatment equipment, in particular to a device for removing nitrate nitrogen in resin desorption liquid and an application process thereof.

Background technique

Among the advanced treatment technologies of biochemical tail water, resin adsorption technology is the most widely used advanced treatment technology. Resin technology has the advantages of large adsorption capacity, good treatment effect, stable reuse, etc. However, the composition of the desorption liquid produced after wastewater treatment with resin is quite complex, with high salinity, high content of organic matter, high concentration of nitrate nitrogen, deep color, and difficult biodegradation. The desorption solution is difficult to handle, which greatly limits the further popularization and application of the magnetic resin. Therefore, it is urgent to find an efficient and economical treatment method.

At present, in the sewage denitrification treatment process, the biological denitrification method is mainly used, and the denitrification reaction requires the dissolved oxygen concentration in the wastewater to be lower than 0.5mg/L, which puts forward requirements on the water quality of the influent; the current removal of wastewater For the nitrate nitrogen device, each reactor is separated and connected by pipes. This pipe-connected device for removing nitrate nitrogen in wastewater not only occupies a large area, but also wastes a lot of resources.

Contents of the invention

The technical problem to be solved by the present invention is to provide an integrated device for removing nitrate nitrogen in resin desorption liquid with simple structure and convenient operation. The device can effectively remove nitrate nitrogen in waste water.

In order to solve the above-mentioned technical problems, the present invention provides a device for removing nitrate nitrogen in the resin desorption liquid, including a reactor, an aeration device, a water inlet tank and an ozone dosing device, the reactor is a concentric cylindrical structure, The inner layer of the reactor of the concentric cylindrical structure is an ozone contact reactor, and the outer layer is an anoxic reactor and a sludge settler spaced apart, and the bottom of the anoxic reactor and the sludge settler is connected, and the ozone The upper end of the contact reactor is provided with a water outlet connected to the anoxic reactor, and the lower end of the ozone contact reactor is filled with ozone reaction catalytic packing, and the ozone contact reactor is connected to the water inlet tank through a connecting pipe one, and the ozone contact reactor The reactor is connected with the ozone dosing device through connecting pipe two, and the device also includes an ozone collecting device, the air inlet of the ozone collecting device communicates with the top of the ozone contact reactor, and the gas outlet of the ozone collecting device is equipped with The connecting pipe three of the circulating pump is connected with the ozone dosing device.

Further, the ozone contact reactor is connected to the water inlet tank through a connecting pipeline equipped with a waste water lifting pump.

Further, the aspect ratio of the ozone contact reactor in the inner layer is 2:1, and the aspect ratio of the outer zone where the anoxic reactor and the sludge settler are located is 3:2.

Further, the effective volume of the ozone contact reactor is 12.5L, and the effective volume of the outer zone where the anoxic reactor and the sludge settler are located is 25L.

Further, in the reactor with concentric cylindrical structure, the outer layer area opposite to the central angle of 120 degrees is an anoxic reactor, and the remaining outer layer area is a sludge settler, and the two are separated by a partition.

Further, the filling height of the ozone catalytic oxidant is 0.3m-1m.

The present invention also provides an application process of a device for removing nitrate nitrogen in the resin desorption liquid, and the specific steps are as follows:

(1) After the wastewater to be treated is lifted by the wastewater lift pump, it is mixed with the ozone from the ozone dosing device in the lower part of the ozone contact reactor;

(2) After the wastewater mixed with ozone passes through the aeration device, it reacts with the ozone reaction catalytic filler in the ozone contact reactor. After the reaction, the excess ozone gas is collected by the ozone collection device communicated with the ozone contact reactor. The ozone is injected into the ozone dosing device by the circulation pump, and the waste water after the reaction overflows from the water outlet at the upper end of the ozone contact reactor to the anoxic reactor;

(3) In the anoxic reactor, the denitrifying bacteria and the wastewater overflowing into the anoxic reactor denitrify, and the denitrified wastewater flows into the sludge settler through the bottom;

(4) The waste water after the denitrification reaction flows into the sludge settler for precipitation, and the settled waste water can be discharged.

Further, the reaction environment of the ozone contact reactor in the step (1) has a pH of 2 to 5, and the hydraulic retention time of the wastewater in the ozone contact reactor is 1 to 3 hours.

Further, the reaction environment of the anoxic reactor in the step (2) is pH 6-8, and the hydraulic retention time of the wastewater in the anoxic reactor is 12-24h.

Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

(1) The ozone contact reactor, the anoxic reactor and the sludge precipitator in the present invention jointly form a reactor with a concentric cylindrical structure, which makes the whole device compact in structure and small in floor space .

(2) In the reactor with concentric cylindrical structure, the upper end of the ozone contact reactor in the inner layer is provided with a water outlet connected to the anoxic reactor, and the waste water overflows directly to the anoxic reactor after redox reaction occurs in the ozone contact reactor. The reactor does not need to be transported to the anoxic reactor through pipelines, which not only saves a lot of materials, but also shortens the time for wastewater to flow into the anoxic reactor.

(3) In the reactor with concentric cylindrical structure, the anoxic reactor in the outer layer is connected to the bottom of the sludge settler, and the wastewater flows through the bottom to the sludge settler for precipitation after denitrification occurs in the anoxic reactor, While saving costs, it also improves the efficiency of wastewater treatment.

(4) The ozone collection device in the present invention is connected with the ozone dosing device through a circulating pump, so that not only can the excess ozone after the reaction be collected, but also the reuse of resources can be realized.

(5) The ozone dosing device in the present invention is connected with the aeration device, which can ensure sufficient contact between the wastewater and the ozone, so that the redox reaction can be carried out more thoroughly.

(6) The wastewater mixed with ozone in the present invention stays hydraulically for 1 to 3 hours in the ozone contact reactor, so that macromolecular substances can be converted into small molecular substances, the chemical oxygen demand of the wastewater is reduced, and the biodegradability is improved.

(7) The wastewater in the present invention stays hydraulically for 12 to 24 hours in the anoxic reactor in order to allow the denitrification reaction to be carried out more thoroughly and to fully remove the nitrate nitrogen in the wastewater.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of the device connection relationship of the present invention;

Fig. 2 is the top view of the reactor of concentric cylinder structure in Fig. 1;

Description of reference signs: 1. Water inlet tank, 2. Waste water lifting pump, 3. Ozone contact reactor, 4. Ozone dosing device, 5. Ozone reaction catalytic packing, 6. Ozone collection device, 7. Water outlet, 8 . Anoxic reactor, 9. Sludge settler, 10. Circulation pump, 11. Aeration device, 12. Partition plate, 13. Connecting pipeline one, 14. Connecting pipeline two, 15. Connecting pipeline three.

detailed description

The following examples are only used to illustrate the present invention, but not to limit the scope of the present invention.

Example 1

As shown in Figure 1, a device for removing nitrate nitrogen in the resin desorption liquid includes a reactor, an aeration device 11, a water inlet tank 1 and an ozone dosing device 4, and is characterized in that: the reactor is concentric Cylindrical structure, the inner layer of the reactor of the concentric cylindrical structure is an ozone contact reactor 3, the outer layer is an anoxic reactor 8 and a sludge precipitator 9 spaced apart, and the anoxic reactor 8 and sludge sedimentation The bottom of the device 9 is connected, and the upper end of the ozone contact reactor 3 is provided with a water outlet 7 communicating with the anoxic reactor 8, and the lower end of the ozone contact reactor 8 is filled with an ozone reaction catalytic packing 5, and the ozone contact reactor 3 Connect with water inlet box 1 by connecting pipeline one 13, described ozone contact reactor 3 is connected with ozone dosing device 4 by connecting pipeline two 14, and described device also comprises ozone collecting device 6, the inlet of described ozone collecting device 6 The gas port is connected to the top of the ozone contact reactor 3, and the gas outlet of the ozone collecting device (6) is connected with the ozone dosing device 4 through the connecting pipe three 15 equipped with the circulation pump 10.

In this embodiment, the ozone contact reactor 3 is connected to the water inlet tank 1 through a connecting pipeline 13 equipped with a waste water lift pump 2 .

In this embodiment, the aspect ratio of the inner ozone contact reactor 3 is 2:1, and the aspect ratio of the outer region where the anoxic reactor 8 and the sludge precipitator 9 are located is 3:2.

In this embodiment, the effective volume of the ozone contact reactor is 12.5L, and the effective volume of the outer layer area where the anoxic reactor 8 and the sludge settler 9 are located is 25L.

In this embodiment, in the reactor with concentric cylindrical structure, the outer layer area opposite to the central angle of 120 degrees is the anoxic reactor 8, and the remaining outer layer area is the sludge settler 9, and the two are separated by a partition .

In this embodiment, the filling height of the ozone catalytic oxidizer 5 is 0.3m-1m.

Utilize above-mentioned device to remove the technology of nitrate nitrogen in resin desorption liquid as follows:

Mix 12L wastewater with influent COD of 1500mg/L and nitrate nitrogen concentration of 150mg/L and ozone from the ozone dosing device in the lower part of the ozone contact reactor, and then enter the ozone contact reactor with a volume of 12.5L through the aeration device In the process, under the condition of pH between 4 and 5, after a hydraulic retention time of 3 hours, the wastewater overflows from the outlet at the upper end of the ozone contact reactor into the anoxic reactor with a volume of 16.5L. In the process, the denitrifying bacteria denitrify the wastewater in the anoxic reactor under the condition of pH between 7 and 8. After 24 hours of hydraulic retention time, the wastewater enters the sludge settler for precipitation, and the precipitated wastewater can be discharged. In this embodiment, the COD value of the treated wastewater is reduced to 300 mg/L, the removal rate reaches 80%, and the NO ₃ ^- -N removal rate reaches 90%.

Example 2

Utilize the device among the embodiment 1 to remove the technology of nitrate nitrogen in the resin desorption liquid as follows:

Mix 10L wastewater with influent COD of 1000mg/L and nitrate nitrogen concentration of 100mg/L and ozone from the ozone dosing device in the lower part of the ozone contact reactor, and then enter the 12.5L ozone contact reactor through the aeration device , under the condition that the pH is between 4 and 5, after a hydraulic retention time of 3 hours, the wastewater overflows from the water outlet at the upper end of the ozone contact reactor to the anoxic reactor with a volume of 16.5L. In the anoxic reactor, The denitrifying bacteria denitrify with the wastewater in the anoxic reactor under the condition of pH between 7 and 8. After 20 hours of hydraulic retention time, they enter the sludge settler to settle, and the settled wastewater can be discharged. In this embodiment, the COD value of the treated wastewater is reduced to 190 mg/L, the removal rate reaches 83%, and the NO ₃ ^- -N removal rate reaches 92%.

Example 3

Utilize the device among the embodiment 1 to remove the technology of nitrate nitrogen in the resin desorption liquid as follows:

Mix the 12L wastewater with an average influent COD of 2000mg/L and a nitrate nitrogen concentration of 300mg/L and the ozone from the ozone dosing device in the lower part of the ozone contact reactor, and then enter the ozone contact reaction with a volume of 12.5L through the aeration device In the reactor, under the condition of pH between 4 and 5, after a hydraulic retention time of 2 hours, the wastewater overflows from the water outlet at the upper end of the ozone contact reactor to the anoxic reactor with a volume of 16.5L. In the reactor, the denitrifying bacteria denitrify with the wastewater from the anoxic reactor under the condition of pH between 7 and 8, and after 15 hours of hydraulic retention time, they enter the sludge settler for precipitation, and the wastewater after precipitation can be emission. In this embodiment, the COD value of the treated wastewater is reduced to 530 mg/L, the removal rate reaches 77%, and the NO ₃ ^- -N removal rate reaches 87%.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than as a limitation to the present invention, as long as within the scope of the spirit of the present invention, the above-described embodiments Changes and modifications will fall within the scope of the claims of the present invention.

Claims (9)

1. a device for removing nitrate nitrogen in resin desorption liquid, comprising reactor, aeration device (11), water inlet tank (1) and ozone dosing device (4), is characterized in that: described reactor It is a concentric cylindrical structure, and the inner layer of the reactor of the concentric cylindrical structure is an ozone contact reactor (3), and the outer layer is an anoxic reactor (8) and a sludge settler (9) spaced apart, and the said deficient The oxygen reactor (8) communicates with the bottom of the sludge precipitator (9), and the upper end of the ozone contact reactor (3) is provided with a water outlet (7) communicated with the anoxic reactor (8), and the ozone contact reaction The lower end of the device (8) is filled with ozone reaction catalytic packing (5), and the ozone contact reactor (3) is connected with the water inlet tank (1) by connecting pipeline one (13), and the ozone contact reactor (3) is connected by Connecting pipeline two (14) is connected with ozone dosing device (4), and described device also comprises ozone collecting device (6), and the air inlet of described ozone collecting device (6) communicates with the top of ozone contact reactor (3) , the gas outlet of the ozone collection device (6) is connected with the ozone dosing device (4) through the connecting pipe three (15) equipped with the circulation pump (10). 2. a kind of device that removes nitrate nitrogen in the resin desorption liquid according to claim 1, is characterized in that: described ozone contact reactor (3) is equipped with the connection pipeline-( 13) Connect with the water inlet tank (1). 3. a kind of device that removes nitrate nitrogen in the resin desorption liquid according to claim 1, is characterized in that: the aspect ratio of described inner layer ozone contact reactor (3) is 2:1, and described deficient The height-to-diameter ratio of the outer area where the oxygen reactor (8) and the sludge precipitator (9) are located is 3:2. 4. the device for removing nitrate nitrogen in a kind of resin desorption liquid according to claim 3, is characterized in that: the effective volume of described ozone contact reactor is 12.5L, and described anoxic reactor (8) and The effective volume of the outer zone where the sludge settler (9) is located is 25L. 5. A kind of device for removing nitrate nitrogen in resin desorption liquid according to claim 1, it is characterized in that: in the reactor of concentric cylindrical structure, the outer layer area that 120 degree central angles are opposite is anoxic reaction device (8), and the remaining outer layer area is a sludge settler (9), and the two are separated by a partition (12). 6 . The device for removing nitrate nitrogen in the resin desorption liquid according to claim 1 , characterized in that: the filling height of the ozone catalytic oxidant ( 5 ) is 0.3 m to 1 m. 7. An application process of a device for removing nitrate nitrogen in the resin desorption liquid as claimed in any one of claims 1-6, characterized in that: the specific steps are as follows: (1) After the wastewater to be treated is lifted by the wastewater lift pump (2), it is mixed with the ozone from the ozone dosing device (4) at the lower part of the ozone contact reactor (3); (2) After the wastewater mixed with ozone passes through the aeration device (11), it reacts with the ozone reaction catalytic filler (5) in the ozone contact reactor (3), and after the reaction, the excess ozone gas passes through the ozone contact reactor (3) Connected ozone collection device (6) collects, and the collected ozone is driven into the ozone dosing device (4) by the circulation pump (10), and the waste water after the reaction is from the water outlet at the upper end of the ozone contact reactor (3) (7) overflow to anoxic reactor (8); (3) In the anoxic reactor (8), the denitrifying bacteria and the waste water overflowing into the anoxic reactor (8) undergo a denitrification reaction, and the waste water after the denitrification reaction flows into the sludge settler (9) through the bottom ); (4) The denitrified waste water flows into the sludge settler (9) for precipitation, and the settled waste water can be discharged. 8. the application technology of the device of a kind of removing nitrate nitrogen in the resin desorption liquid according to claim 7, it is characterized in that: the reaction environment of the ozone contact reactor (3) in the described step (1) is PH Between 2 and 5, the hydraulic retention time of the wastewater in the ozone contact reactor (3) is 1 to 3 hours. 9. the application technology of the device of a kind of removing nitrate nitrogen in the resin desorption liquid according to claim 7, it is characterized in that: the reaction environment of the anoxic reactor (8) in the described step (2) is PH Between 6 and 8, the hydraulic retention time of the wastewater in the anoxic reactor (8) is 12-24h.