An apparatus for controlling short-cut nitrification and denitrification of embedded particles

Abstract

The application relates to a device for controlling short-range nitrification and denitrification of embedded particles, which comprises a water inlet module, a constant-temperature heating module, an alkali adding module, a free nitrous acid real-time monitoring module, an aeration fan, an aerobic tank, an anoxic tank, an MBR tank, a water outlet module and a sludge discharge module; the water inlet module, the constant-temperature heating module and the free nitrous acid real-time monitoring module are connected with the aerobic tank; the alkali adding module is connected with the anoxic tank; the aeration fan is connected with the bottom of the aerobic tank and the MBR tank respectively; the MBR tank is further provided with the water outlet module and the sludge discharge module. The device has the beneficial effects that the device controls the FNA in the aerobic tank at a high level through backflow of the aerobic tank, inhibits the activity of NOB in the embedded particles, makes ammonia nitrogen oxidation stay in the nitrosation stage, realizes the stability of short-range nitrification and denitrification of the embedded particles, the total nitrogen removal rate of the system reaches more than 85%, and the energy consumption can be reduced by about 15%.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, more particularly, it relates to a device for controlling short-cut nitrification and denitrification of embedded particles. BACKGROUND

[0002] In water treatment engineering, the removal of ammonia nitrogen is mainly through the nitrification of nitrifying microorganisms to convert ammonia nitrogen into nitrate nitrogen and nitrite nitrogen, and then through the action of denitrifying microorganisms to convert them into nitrogen gas or nitrogen oxides, wherein the nitrification is the key first step to determine the biological denitrification. The traditional activated sludge method as a relatively mature denitrification process has poor effect in treating low-concentration ammonia nitrogen wastewater, because the low concentration of ammonia nitrogen affects the enrichment of nitrifying microorganisms, resulting in a decrease in the overall denitrification efficiency of the system. Therefore, in view of this defect, the immobilized microorganism technology emerges as the times require, among which the application of embedded immobilized technology is the most widespread. The embedded immobilized microorganism technology is a method for positioning free microorganisms in a limited carrier space field by chemical or physical means, and keeping them active and repeatedly used. In the application process of wastewater denitrification, the embedded technology can enrich the denitrification dominant bacteria genus at high concentration, prolong the residence time of microorganisms in the system; the embedded carrier can also alleviate the influence of external factors on the dominant bacteria genus, and provide suitable growth and reaction space for microorganisms. SUMMARY

[0003] The present application aims at the deficiencies of the prior art, and provides a device for controlling short-cut nitrification and denitrification of embedded particles.

[0004] In a first aspect, a device for controlling short-cut nitrification and denitrification of embedded particles is provided, comprising: a water inlet module, a constant temperature heating module, an alkali adding module, a free nitrite real-time monitoring module, an aeration fan, an aerobic tank, an anoxic tank, an MBR tank, a water outlet module and a sludge discharge module.

[0005] The water inlet module, the constant temperature heating module and the free nitrite real-time monitoring module are all connected with the aerobic tank; the alkali adding module is connected with the anoxic tank; the aeration fan is connected with the bottom of the aerobic tank and the MBR tank respectively; the MBR tank is further provided with the water outlet module and the sludge discharge module.

[0006] As a preferred, the water quality of the water inlet module includes ammonia nitrogen concentration of 200-260 mg / L, C / N ratio of 1-10, and pH of 8-8.5.

[0007] As a preferred, the aerobic tank is added with nitrification embedded particles for oxidizing ammonia nitrogen in wastewater into nitrite nitrogen, and the adding amount is 10-30% of the volume of the aerobic tank, and the bottom of the aerobic tank is provided with an aeration disc for providing oxygen for microorganisms.

[0008] As preferred, the denitrification embedded particles are added in the anoxic tank for reducing the nitrite nitrogen produced in the aerobic tank into nitrogen-containing gas, and the adding amount is 10-30% of the volume of the anoxic tank; the agitator 11 is arranged in the anoxic tank for uniformly mixing the denitrification embedded particles and the wastewater.

[0009] As preferred, the membrane assembly is arranged in the MBR tank for retaining the beneficial microorganisms in the system, the sludge concentration in the MBR tank is controlled at 3000-5000 mg / L for treating the residual organic matter in the system; the aeration plate is arranged in the MBR tank for providing oxygen for the microorganisms.

[0010] As preferred, the anoxic tank reflux pipe is arranged for refluxing from the front end of the MBR tank to the anoxic tank, and the aerobic tank reflux pipe is arranged for refluxing from the front end of the anoxic tank to the aerobic tank.

[0011] As preferred, the anoxic tank reflux ratio is controlled at 200-400%, and the aerobic tank reflux ratio is controlled at 300-600%.

[0012] In the second aspect, a working method of the device for controlling the short-cut nitrification and denitrification of the embedded particles is provided, and the working method comprises the following steps:

[0013] Step 1: feeding water into the aerobic tank through the water feeding module;

[0014] Step 2: controlling the system temperature to be stable at 30-35℃ through the constant-temperature heating module, and controlling the pH of the anoxic tank at 7.5-8 through the alkali adding module 3;

[0015] Step 3: monitoring the free nitrous acid concentration in the aerobic tank in real time through the free nitrous acid real-time monitoring module;

[0016] Step 4: providing dissolved oxygen for the aerobic tank and the MBR tank through the aeration fan, and controlling the dissolved oxygen concentration at 2-4 mg / L;

[0017] Step 5: oxidizing the ammonia nitrogen in the wastewater into nitrite nitrogen through the aerobic tank with the nitrification embedded particles;

[0018] Step 6: reducing the nitrite nitrogen produced in the aerobic tank into nitrogen-containing gas through the anoxic tank with the denitrification embedded particles;

[0019] Step 7: treating the residual organic matter in the system through the MBR tank, discharging water after the system treatment is completed through the water discharging module, and discharging the residual sludge through the sludge discharging module.

[0020] As preferred, in Step 7, the nitrite nitrogen in the MBR tank which is not completely denitrified is refluxed to the anoxic tank for further removal through the anoxic tank reflux pipe; part of the nitrite nitrogen is refluxed to the aerobic tank through the aerobic tank reflux pipe, and the 6FNA concentration in the aerobic tank is controlled at a normal level.

[0021] The beneficial effects of the present application are:

[0022] 1. The present application controls the FNA in the aerobic tank at a higher level by backflow in the aerobic tank, inhibits the activity of NOB in the embedded particles, and makes the ammonia oxidation remain in the nitrosation stage, so that the stability of short-cut nitrification and denitrification of the embedded particles can be realized, the total nitrogen removal rate of the system is more than 85%, and the energy consumption can be reduced by about 15%.

[0023] 2. The present application combines the embedded particles with activated sludge, adopts a pre-aerobic and post-anoxic system, ensures high free ammonia concentration in the aerobic tank, and inhibits the growth of NOB; the low C / N ratio and high ammonia nitrogen wastewater can be denitrified and the organic matter can be quickly removed; the stability of short-cut nitrification of the embedded particles is maintained, and the nitrite nitrogen in the effluent of the aerobic tank can be maintained at more than 180 mg / L.

[0024] 3. The present application adopts a post-MBR system, the membrane assembly in the system can intercept free microorganisms, and can prevent the low C / N ratio wastewater from affecting sludge loss; the beneficial microorganisms in the MBR tank are basically heterotrophic bacteria, which can effectively reduce the organic matter in the system; and the COD removal rate of the system is more than 90%. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a device for controlling short-cut nitrification and denitrification of embedded particles.

[0026] The figure mark is explained: the water inlet module 1, the constant temperature heating module 2, the alkali adding module 3, the free nitrous acid real-time monitoring module 4, the aeration fan 5, the aerobic tank 6, the nitrification embedded particles 7, the denitrification embedded particles 8, the aeration disc 9, the anoxic tank 10, the stirrer 11, the MBR tank 12, the membrane assembly 13, the anoxic tank backflow pipe 14, the aerobic tank backflow pipe 15, the effluent module 16, and the sludge discharge module 17. DETAILED DESCRIPTION

[0027] The present application will be further described below in conjunction with examples. The following examples are only used to help understand the present application. It should be pointed out that for ordinary people in the technical field, some modifications can be made without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0028] Example 1:

[0029] The present application provides a device for controlling short-cut nitrification and denitrification of embedded particles, as shown in Figure 1 Fig. 1, which comprises a water inlet module 1, a constant temperature heating module 2, an alkali adding module 3, a free nitrous acid real-time monitoring module 4, an aeration fan 5, an aerobic tank 6, an anoxic tank 10, an MBR tank 12, an effluent module 16, and a sludge discharge module 17.

[0030] Wherein, the water inlet module 1, the constant temperature heating module 2 and the free nitrous acid real-time monitoring module 4 are connected with the aerobic tank 6; the alkali adding module 3 is connected with the anoxic tank 10; the aeration fan 5 is connected with the bottom of the aerobic tank 6 and the MBR tank 12 respectively; the MBR tank 12 is further provided with a water outlet module 16 and a sludge discharge module 17.

[0031] The water quality of the water inlet module 1 includes ammonia nitrogen concentration of 200-260 mg / L, C / N ratio of 1-10, and pH of 8-8.5.

[0032] The aerobic tank 6 is added with nitration embedded particles 7 for oxidizing ammonia nitrogen in wastewater into nitrite nitrogen, and the adding amount is 10-30% of the volume of the aerobic tank 6; the bottom of the aerobic tank 6 is provided with an aeration disc 9 for providing oxygen for microorganisms.

[0033] The anoxic tank 10 is added with denitrification embedded particles 8 for reducing nitrite nitrogen produced in the aerobic tank into nitrogen-containing gas, and the adding amount is 10-30% of the volume of the anoxic tank; the anoxic tank is further provided with a stirrer 11 for uniformly mixing the denitrification embedded particles 8 with wastewater.

[0034] The MBR tank 12 is provided with a membrane assembly 13 for retaining beneficial microorganisms in the system, and the sludge concentration in the MBR tank 12 is controlled at 3000-5000 mg / L for treating residual organic matter in the system; the MBR tank 12 is provided with an aeration disc 9 for providing oxygen for microorganisms.

[0035] Example 2:

[0036] On the basis of example 1, another device for controlling short-cut nitrification and denitrification of embedded particles is provided, as shown in FIG. Figure 1 The device includes a water inlet module 1, a constant temperature heating module 2, an alkali adding module 3, a free nitrous acid real-time monitoring module 4, an aeration fan 5, an aerobic tank 6, an anoxic tank 10, an MBR tank 12, a water outlet module 16 and a sludge discharge module 17.

[0037] In addition, an anoxic tank backflow pipe 14 is further provided for backflow from the front end of the MBR tank 12 to the anoxic tank 10, and an aerobic tank backflow pipe 15 is further provided for backflow from the front end of the anoxic tank 10 to the aerobic tank 6.

[0038] Wherein, the anoxic tank 10 backflow ratio is controlled at 200-400%, and the aerobic tank 6 backflow ratio is controlled at 300-600%.

[0039] Specifically, the method provided in the present embodiment corresponds to the construction technology of the subgrade provided in example 1, and therefore, the same or similar parts in the present embodiment and example 1 can be mutually referred to, and will not be described herein again.

[0040] Embodiment 3

[0041] On the basis of embodiments 1 and 2, the present application provides a working method of the device for controlling short-range nitrification and denitrification of embedded particles, comprising:

[0042] Step 1, water is fed to the aerobic tank 6 through the water feeding module 1;

[0043] Step 2, the system temperature is kept stable at 30-35℃ through the constant temperature heating module 2, and the pH of the anoxic tank is controlled at 7.5-8 through the alkali feeding module 3;

[0044] Step 3, the free nitrous acid concentration in the aerobic tank 6 is monitored in real time through the free nitrous acid real-time monitoring module 4;

[0045] Step 4, the aerobic tank 6 and the MBR tank 12 are provided with dissolved oxygen through the aeration fan 5, and the dissolved oxygen concentration is controlled at 2-4 mg / L;

[0046] Step 5, the ammonia nitrogen in the wastewater is oxidized into nitrite nitrogen through the aerobic tank 6 with nitrification embedded particles 7;

[0047] Step 6, the nitrite nitrogen produced in the aerobic tank 6 is reduced into nitrogen-containing gas through the anoxic tank 10 with denitrification embedded particles 8;

[0048] Step 7, the remaining organic matter in the system is treated through the MBR tank 12, and the water is discharged after the system treatment is completed through the water discharge module 16, and the remaining sludge is discharged through the sludge discharge module 17.

[0049] In step 7, the nitrite nitrogen in the MBR tank that is not completely denitrified is refluxed to the anoxic tank 10 through the anoxic tank reflux pipe 14 for further removal, and part of the nitrite nitrogen is refluxed to the aerobic tank 6 through the aerobic tank reflux pipe 15 to control the 6FNA concentration in the aerobic tank to reach the normal level.

[0050] Specifically, the method provided in the present embodiment is the method corresponding to the device provided in embodiments 1 and 2, therefore, the same or similar parts in the present embodiment and embodiments 1 and 2 can be mutually referred to, which will not be repeated herein.

Claims

1. An apparatus for controlling short-cut nitrification-denitrification of embedded particles, characterized by The application relates to a wastewater treatment system, which comprises the following modules: a water inlet module (1), a constant-temperature heating module (2), an alkali adding module (3), a free nitrous acid real-time monitoring module (4), an aeration fan (5), an aerobic tank (6), an anoxic tank (10), an MBR tank (12), a water outlet module (16) and a sludge discharge module (17). The water inlet module (1), the constant-temperature heating module (2) and the free nitrous acid real-time monitoring module (4) are connected with the aerobic tank (6); the alkali adding module (3) is connected with the anoxic tank (10); the aeration fan (5) is connected with the bottom of the aerobic tank (6) and the MBR tank (12) respectively; the MBR tank (12) is further provided with the water outlet module (16) and the sludge discharge module (17). The aerobic tank (6) is provided with nitration embedded particles (7) for oxidizing ammonia nitrogen in wastewater into nitrite nitrogen, and the adding amount is 10-30% of the volume of the aerobic tank (6); the bottom of the aerobic tank (6) is provided with an aeration disc (9) for providing oxygen for microorganisms. The anoxic tank (10) is provided with denitrification embedded particles (8) for reducing the nitrite nitrogen generated in the aerobic tank into nitrogen-containing gas, and the adding amount is 10-30% of the volume of the anoxic tank; the anoxic tank is further provided with a stirrer (11) for uniformly mixing the denitrification embedded particles (8) and wastewater. An anoxic tank backflow pipe (14) is arranged to backflow from the front end of the MBR tank (12) to the anoxic tank (10), and an aerobic tank backflow pipe (15) is arranged to backflow from the front end of the anoxic tank (10) to the aerobic tank (6). The backflow ratio of the anoxic tank (10) is controlled to be 200-400%, and the backflow ratio of the aerobic tank (6) is controlled to be 300-600%. The water quality of the water inlet module (1) comprises ammonia nitrogen concentration of 200-260 mg / L, C / N ratio of 1-10 and pH of 8-8.

5.

2. The apparatus for controlling particulate short-cut nitrification and denitrification according to claim 1, characterized by, The MBR tank (12) is provided with a membrane assembly (13) for intercepting beneficial microorganisms in the system, the sludge concentration in the MBR tank (12) is controlled to be 3000-5000 mg / L, and the MBR tank (12) is provided with an aeration disc (9) for providing oxygen for microorganisms.

3. The apparatus for controlling particulate short-cut nitrification and denitrification according to claim 1, characterized by, The application further discloses a wastewater treatment method, which comprises the following steps:

4. A method of operating a device for controlling the short-cut nitrification and denitrification of particles as claimed in claim 1, characterized in that Step 1, water is fed into the aerobic tank (6) through the water inlet module (1); Step 2, the system temperature is controlled to be stable at 30-35 DEG C through the constant-temperature heating module (2), and the pH of the anoxic tank is controlled to be 7.5-8 through the alkali adding module (3); Step 3, the free nitrous acid concentration in the aerobic tank (6) is monitored in real time through the free nitrous acid real-time monitoring module (4); Step 4, dissolved oxygen is provided for the aerobic tank (6) and the MBR tank (12) through the aeration fan (5), and the dissolved oxygen concentration is controlled to be 2-4 mg / L; Step 5, ammonia nitrogen in wastewater is oxidized into nitrite nitrogen through the aerobic tank (6) provided with the nitration embedded particles (7); Step 6, the nitrite nitrogen generated in the aerobic tank (6) is reduced into nitrogen-containing gas through the anoxic tank (10) provided with the denitrification embedded particles (8). ​ Step 7: Treat the remaining organic matter in the system through the MBR tank (12) and discharge the water through the effluent module (16) after the system treatment is completed. Dispose of the remaining sludge through the sludge discharge module (17). Return the nitrite nitrogen that has not been completely denitrified in the MBR tank to the anoxic tank (10) through the anoxic tank return pipe (14) for further removal. Return some of the nitrite nitrogen to the aerobic tank (6) through the aerobic tank return pipe (15) to control the FNA concentration in the aerobic tank (6) to reach the normal level.

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