CN111635005B - A disinfection treatment method for deep denitrification and dephosphorization of urban sewage - Google Patents

Abstract

The invention discloses a disinfection treatment method for deep nitrogen and phosphorus removal of municipal sewage, belonging to the field of sewage treatment, comprising a box body, wherein an ammoniation tank, a nitrification tank and a denitrification tank are respectively arranged in the box body, a liquid conveying pipe is communicated between the two adjacent tanks, the upper parts of the ammoniation tank are communicated with a liquid inlet pipe, the upper ends of the ammoniation tank, the nitrification tank and the denitrification tank are communicated with a feeding pipe, the invention can realize the retention time of oxygen bubbles in water, improve the dissolution rate of oxygen in water and increase the activity of biological bacteria, thereby improving the efficiency of biological reaction and the sewage treatment effect, an attachment rod imitating the shape of a cactus is utilized to provide an attachment point for the bubbles, thereby increasing the retention time of the bubbles in water, the attachment rod is arranged close to the position generated by the bubbles, preventing the bubbles from immediately floating up, and the opening and closing of a shaping cover are like the mouth of a fish to spit water, the volume of the bubbles can be increased, and the dissolved oxygen in the water can be further improved.

Description

A disinfection treatment method for deep denitrification and dephosphorization of urban sewage

technical field

The invention relates to the field of sewage treatment, in particular to a disinfection treatment method for deep denitrification and dephosphorization of urban sewage.

Background technique

Since the 1960s, foreign countries have systematically carried out research on physical treatment methods for nitrogen and phosphorus removal. The results show that the disadvantages of physical methods are large consumption of chemicals, large amounts of sludge, and high operating costs. Therefore, urban sewage treatment plants are generally not recommended. Since the 1970s, foreign countries have begun to study and gradually adopt the activated sludge method for biological nitrogen and phosphorus removal. my country began to study biological nitrogen and phosphorus removal technology in the 1980s, and gradually realized the industrialization process in the late 1980s.

The basic principle of biological denitrification of wastewater is that on the basis of converting organic nitrogen into ammonia nitrogen, the aerobic stage is first used to undergo nitrification, and the synergistic effect of nitrifying bacteria and nitrifying bacteria converts ammonia and nitrogen into ammonia and nitrogen through nitrification. Nitrite nitrogen and nitrate nitrogen are converted into nitrogen gas through denitrification under anoxic conditions, and released into the atmosphere by overflowing the water surface, participating in the natural nitrogen cycle. Biological phosphorus removal is the use of phosphorus accumulating bacteria. It releases phosphorus, absorbs phosphorus from the outside in aerobic state, and stores it in the body in aggregated form to form high phosphorus sludge, which is discharged from the system to achieve the effect of phosphorus removal from wastewater.

However, in the current biological denitrification and phosphorus removal treatment, when the aerobic tank is aerated, the bubbles formed by oxygen stay in the water for a short time, and the number of bubbles formed is also less, resulting in a low oxygen dissolution rate in the water, and aerobic Bacteria cannot fully exert their activity, which affects the progress of biological reactions, thereby reducing the effect of sewage treatment.

SUMMARY OF THE INVENTION

1. Technical problems to be solved

In view of the problems existing in the prior art, the purpose of the present invention is to provide a disinfection treatment method for deep denitrification and dephosphorization of urban sewage, which can realize the residence time of oxygen bubbles in water, improve the dissolution rate of oxygen in water, and increase biological bacteria. The activity of the bubbles is increased, thereby improving the efficiency of biological reactions and the effect of sewage treatment. The cactus-shaped attachment rod is used to provide attachment points for the bubbles, thereby increasing the residence time of the bubbles in the water. The bubbles float up immediately, and the oxygen overflowing from the sewage is re-injected into the sewage by the oxygenator, which saves energy and reduces consumption. In addition, the opening and closing of the plastic cover can increase the volume of the bubbles and further improve the water quality. of dissolved oxygen.

2. Technical solutions

In order to solve the above problems, the present invention adopts the following technical solutions.

A disinfection treatment method for deep denitrification and dephosphorization of urban sewage, comprising a box body, wherein an ammoniation tank, a nitrification tank and a denitrification tank are respectively arranged in the box body, and an infusion pipe is connected between the two adjacent tanks, and the ammonia The upper part of the nitrification tank is connected with a liquid inlet pipe, the upper ends of the ammoniation tank, the nitrification tank and the denitrification tank are all connected with a feeding pipe, and the feeding pipe located in the ammoniation tank is communicated with the liquid inlet pipe, and the nitrification tank is connected with the liquid inlet pipe. A flushing box is fixedly connected to the inner wall of the upper end of the denitrification tank, and one end of the flushing box is provided with an opening. An aeration fan is installed at the upper end, and the nitrification tank is provided with an aeration pipe that communicates with the aeration fan. A plurality of diffusion covers are communicated with the side walls of the aeration pipes, and the inner wall of the diffusion cover is fixedly connected with a water blocking plate. And a plurality of ventilation holes are opened on the water blocking plate, the inner wall of the ventilation hole is inlaid with a breathable film, and a plurality of shaping covers are fixedly connected to the side wall of the water blocking board away from the aeration pipe, and each shaping cover is Each of them corresponds to a ventilation hole, a circular frame is fixedly connected to the inner wall of the diffuser away from the water blocking plate, and a plurality of vertically arranged vertical rods are fixedly connected to the circular frame, and the side walls of the vertical rods are fixedly connected There are a plurality of extension rods, the side walls of each extension rod are fixedly connected with a plurality of attachment rods, and each attachment rod is fixedly connected with a plurality of rod thorns, and the bottom of the nitrification tank is connected with a sludge discharge. The lower end of the denitrification tank is connected with a liquid outlet pipe, and the upper end of the denitrification tank is connected with an air outlet pipe.

Further, an oxygenator is installed on the inner wall of the upper end of the nitrification tank, and the output end of the oxygenator penetrates into the water, part of the oxygen dissolves into the sewage, and a part overflows, and the oxygenator re-injects the overflowed oxygen into the sewage. , make full use of oxygen, save energy and reduce consumption.

Further, the shaping cover includes two hemispherical shells, and the two hemispherical shells are dislocated, the shaping cover is made of rubber material, and the two hemispherical shells are arranged in an embracing manner, like a fish mouth, and The two hemispherical shells are made of rubber material with elasticity, so that when the oxygen is squeezed out of the two hemispherical shells, a larger bubble can be formed, imitating the phenomenon of fish mouth spitting.

Further, the outer surfaces of the extension rods, the attachment rods and the thorns are all coated with inorganic salts. Inorganic salts are the main nutrients for bacterial growth. Bacterial activity.

Further, the shape of the diffuser cover is a horn shape, and the bell mouth of the diffuser cover is disposed outward, and the bell mouth of the diffuser cover is larger, which is convenient to generate more oxygen bubbles.

Further, the liquid inlet pipe is inclined, so that the bacterial group is washed down by the sewage.

Further, the inner walls of the lower ends of the two flushing boxes are inclined, and the inclination direction faces the opening of the flushing box downward, so that the water can flush the bacteria groups down.

Further, the inner wall of the lower end of the nitrification tank is in the shape of an inverted bucket, which facilitates the discharge of sludge.

Further, a cover plate is rotatably connected to the opening of the upper end of the gas outlet pipe, and the cover plate is closed to prevent the outside oxygen from entering the denitrification tank without exhausting the gas.

A disinfection treatment method for deep denitrification and dephosphorization of urban sewage, comprising the following steps:

S1, firstly, put the pre-adjusted ammoniated bacteria group into the ammoniation tank from the feeding pipe, the sewage enters the tank from the liquid inlet pipe, and ammoniation occurs in the ammoniated tank; the denitrifying bacteria are put into the ammoniation tank from the feeding pipe denitrification tank;

S2, put the pre-prepared nitrite and phosphorus-accumulating bacteria into the nitrification tank from the feeding pipe, and the infusion pipe draws the water in the ammoniation tank into the nitrification tank, and cultivates the nitrifying bacteria into the extension rod, the attachment rod and the nitrification tank in advance. On the stick, the aeration fan supplies oxygen to the nitrification tank through the aeration pipe, and nitrification occurs in the process, and the sludge is discharged in time through the sludge discharge pipe;

S3, put the pre-prepared denitrifying bacteria group into the denitrification tank from the feeding pipe, denitrification occurs in the anaerobic environment, and the generated nitrogen gas is discharged from the gas outlet pipe.

3. Beneficial effects

Compared with the prior art, the advantages of the present invention are:

(1) This scheme can realize the residence time of oxygen bubbles in water, improve the dissolution rate of oxygen in water, and increase the activity of biological bacteria, thereby improving the efficiency of biological reactions and the effect of sewage treatment. Attachment point, in order to increase the residence time of the bubbles in the water, and the attachment rod is set close to the position where the bubbles are generated to prevent the bubbles from floating immediately. In addition, the opening and closing of the shaping cover is like a fish's mouth spitting blisters, which can increase the size of the bubbles. volume, further increasing the dissolved oxygen in the water.

(2) An oxygenator is installed on the inner wall of the upper end of the nitrification tank, and the output end of the oxygenator runs through the water, part of the oxygen dissolves into the sewage, and a part overflows. Utilize oxygen to save energy and reduce consumption.

(3) The shaping cover includes two hemispherical shells, and the two hemispherical shells are dislocated. The shaping cover is made of rubber material. The shell is made of rubber material that is elastic, so that when oxygen is squeezed out of the two hemispherical shells, a larger bubble is formed, mimicking the phenomenon of fish mouth spit.

(4) The outer surfaces of the extension rods, the attachment rods and the thorns are coated with inorganic salts. Inorganic salts are the main nutrients for bacterial growth. The purpose is to guide bacteria to places with more oxygen, and also provide nutrients to bacteria to increase bacterial growth. active.

(5) The shape of the diffuser is a horn, and the bell mouth of the diffuser is set outward, and the bell mouth of the diffuser is larger, which is convenient to generate more oxygen bubbles.

(6) The liquid inlet pipe is inclined, so that the bacteria can be washed down by the sewage.

(7) The inner walls of the lower ends of the two flushing boxes are all inclined, and the inclination direction faces the opening of the flushing box downward, so that the water can flush the bacteria groups down.

(8) The inner wall of the lower end of the nitrification tank is in the shape of an inverted bucket, which is convenient for sludge discharge.

(9) A cover plate is rotatably connected to the opening of the upper end of the air outlet pipe. In the case of no exhaust gas, closing the cover plate can prevent the outside oxygen from entering the denitrification tank.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the present invention;

Fig. 2 is the structural representation at A place in Fig. 1;

Fig. 3 is the structural representation at place B in Fig. 2;

FIG. 4 is a schematic view of the front structure of the diffuser cover of the present invention;

Fig. 5 is the structural representation at C place in Fig. 4;

FIG. 6 is a schematic view of the front structure of the present invention.

Description of the reference numbers in the figure:

1 box, 101 ammoniation tank, 102 nitrification tank, 103 denitrification tank, 2 infusion pipe, 3 liquid inlet pipe, 4 feeding pipe, 5 flushing tank, 6 aeration fan, 7 aeration pipe, 8 diffusion cover, 9 Water baffle, 10 air holes, 11 breathable membrane, 12 shape cover, 13 ring frame, 14 vertical rod, 15 extension rod, 16 attachment rod, 17 rod thorn, 18 sludge discharge pipe, 19 liquid outlet pipe, 20 Outlet tube, 21 oxygen machine.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. The embodiments of the present invention, and all other embodiments obtained by those of ordinary skill in the art without creative work, fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the orientations shown in the accompanying drawings Or the positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "provided with", "sleeve/connection", "connection", etc., should be understood in a broad sense, such as " "connection", which can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be an internal connection between two components. of connectivity. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Example 1:

Please refer to Figures 1-6, a disinfection treatment method for deep denitrification and phosphorus removal of urban sewage, including a box 1, please refer to Figure 1, the box 1 is divided into an ammonia tank 101, a nitrification tank 102 and a denitrification tank 103 The inner wall of the lower end of the nitrification tank 102 is in the shape of an inverted bucket, which is convenient for the discharge of sludge, and the infusion pipe 2 is connected between the two adjacent tanks, and the upper part of the ammoniation tank 101 is connected with a liquid inlet pipe 3, and the liquid inlet pipe 3 is inclined Set up, so that sewage washes down the bacterial group, the upper ends of the ammoniation tank 101, the nitrification tank 102 and the denitrification tank 103 are all connected with a feeding pipe 4, and the feeding pipe 4 located in the ammoniation tank 101 is communicated with the liquid inlet pipe 3, nitrification The upper end inner walls of the pool 102 and the denitrification tank 103 are all fixedly connected with the flushing box 5, and the lower inner walls of the two flushing boxes 5 are inclined and set, and the inclined direction faces the opening of the flushing box 5, so that the water flushes the bacterial group down, And one end of the flushing box 5 is provided with an opening, and the feeding pipe 4 and the infusion pipe 2 located in the nitrification tank 102 and the denitrification tank 103 are communicated with the flushing box 5 together, the upper end of the nitrification tank 102 is installed with an aeration fan 6, and the nitrification tank is installed. 102 is provided with an aeration pipe 7 that communicates with the aeration fan 6, a plurality of diffusion covers 8 are communicated with the side wall of the aeration pipe 7, the shape of the diffusion cover 8 is a trumpet shape, and the bell mouth of the diffusion cover 8 is arranged outwards, The bell mouth of the diffusion cover 8 is larger, which is convenient to generate more oxygen bubbles. An oxygener 21 is installed on the inner wall of the upper end of the nitrification tank 102, and the output end of the oxygenator 21 penetrates into the water, and a part of the oxygen dissolves into the sewage, and a part of the oxygen is dissolved in the sewage. When it overflows, the oxygen generator 21 re-injects the overflowed oxygen into the sewage, making full use of the oxygen, saving energy and reducing consumption;

2-3, the inner wall of the diffuser cover 8 is fixedly connected with a water blocking plate 9, and a plurality of ventilation holes 10 are opened on the water blocking plate 9. The inner wall of the ventilation holes 10 is embedded with a breathable film 11, and the water blocking plate 9 is far away from The side wall of the aeration pipe 7 is fixedly connected with a plurality of shaping covers 12. The shaping cover 12 includes two hemispherical shells, and the two hemispherical shells are dislocated. The shaping cover 12 is made of rubber material, and the two hemispherical shells are It is set up in a hugging manner, like a fish mouth, and the two hemispherical shells are made of rubber material with elasticity, so that when the oxygen is squeezed out of the two hemispherical shells, a larger bubble can be formed, imitating the spit of the fish mouth. phenomenon, and each shaping cover 12 corresponds to a vent hole 10;

Please refer to FIGS. 4-5 , the inner wall of the diffuser cover 8 away from the water baffle 9 is fixedly connected with a circular frame 13 , and the circular frame 13 is fixedly connected with a plurality of vertically arranged vertical rods 14 , and the side walls of the vertical rods 14 are fixedly connected. A plurality of extension rods 15 are fixedly connected, the side walls of each extension rod 15 are fixedly connected with a plurality of attachment rods 16, and each attachment rod 16 is fixedly connected with a plurality of rod thorns 17, the extension rods 15, the attachment rods The outer surfaces of 16 and 17 are coated with inorganic salts. Inorganic salts are the main nutrients for bacterial growth. The purpose is to attract bacteria to places with more oxygen, and also provide nutrients to bacteria and increase the activity of bacteria. The bottom is communicated with a sludge discharge pipe 18, the lower end of the denitrification tank 103 is communicated with a liquid outlet pipe 19, and the upper end of the denitrification tank 103 is communicated with an air outlet pipe 20, and the upper end opening of the air outlet pipe 20 is rotatably connected with a cover plate. In the case of exhaust gas, closing the cover can prevent outside oxygen from entering the denitrification tank 103 .

Include the following steps:

S1, firstly put the pre-adjusted ammoniated bacteria group into the ammoniation tank 101 from the feeding pipe 4, the sewage enters the tank 1 from the liquid inlet pipe 3, and ammoniation occurs in the ammoniation tank 101; The nitrifying bacteria are put into the denitrification tank 103 by the feeding pipe 4;

S2, put the pre-prepared nitrite bacteria group and phosphorus accumulation bacteria group into the nitrification tank 102 through the feeding pipe 4, and the infusion pipe 2 pumps the water in the ammonia tank 101 into the nitrification tank 102, and the nitrification tank 102 is prepared in advance. Cultivated on the extension rod 15, the attachment rod 16 and the rod thorn 17, the aeration fan 6 supplies oxygen to the nitrification tank 102 through the aeration pipe 7, nitrification occurs in this process, and the sludge is discharged in time through the sludge discharge pipe 18. mud drains out

S3 , the pre-prepared denitrifying bacteria group is put into the denitrification tank 103 from the feeding pipe 4 , and denitrification occurs in an anaerobic environment, and the generated nitrogen gas is discharged from the gas outlet pipe 20 .

It can realize the residence time of oxygen bubbles in water, improve the dissolution rate of oxygen in water, and increase the activity of biological bacteria, thereby improving the efficiency of biological reactions and the effect of sewage treatment. In this way, the residence time of the bubbles in the water is increased, and the sticking rod is set close to the position where the bubbles are generated to prevent the bubbles from floating immediately. In addition, the opening and closing of the shaping cover is like the mouth of a fish spitting water bubbles, which can increase the volume of the bubbles and further improve the dissolved oxygen in water.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the improved concept thereof shall be included within the protection scope of the present invention.

Claims (9)

1. The utility model provides a degassing unit of municipal sewage degree of depth nitrogen and phosphorus removal, includes box (1), be equipped with ammoniation pond (101), nitrification tank (102) and denitrification pond (103) in box (1), and the intercommunication has transfer line (2) between two adjacent ponds, the upper portion intercommunication of ammoniation pond (101) has feed liquor pipe (3), its characterized in that: the upper ends of the ammoniation tank (101), the nitrification tank (102) and the denitrification tank (103) are communicated with a feeding pipe (4), the feeding pipe (4) in the ammoniation tank (101) is communicated with a liquid inlet pipe (3), the inner walls of the upper ends of the nitrification tank (102) and the denitrification tank (103) are fixedly connected with a flushing box (5), one end of the flushing box (5) is provided with an opening, the feeding pipe (4) and the liquid conveying pipe (2) in the nitrification tank (102) and the denitrification tank (103) are communicated with the flushing box (5) together, the upper end of the nitrification tank (102) is provided with an aeration fan (6), the nitrification tank (102) is provided with an aeration pipe (7) communicated with the aeration fan (6), the side wall of the aeration pipe (7) is communicated with a plurality of diffusion covers (8), the inner wall of each diffusion cover (8) is fixedly connected with a water baffle (9), and the water baffle (9) is provided with a plurality of vent holes (10), a breathable film (11) is embedded in the inner wall of the vent hole (10), a plurality of shaping covers (12) are fixedly connected to the side wall of the water baffle (9) far away from the aerator pipe (7), each shaping cover (12) corresponds to one vent hole (10), the inner wall of the diffusion cover (8) far away from the water baffle (9) is fixedly connected with a circular ring frame (13), and the circular ring frame (13) is fixedly connected with a plurality of vertical rods (14) which are vertically arranged, the side wall of the vertical rod (14) is fixedly connected with a plurality of extension rods (15), the side wall of each extension rod (15) is fixedly connected with a plurality of attachment rods (16), and each attachment rod (16) is fixedly connected with a plurality of rod thorns (17), the bottom of the nitrification tank (102) is communicated with a sludge discharge pipe (18), the lower end of the denitrification tank (103) is communicated with a liquid outlet pipe (19), and the upper end of the denitrification tank (103) is communicated with a gas outlet pipe (20);

moulding cover (12) include two hemisphere shells, and two hemisphere shell dislocation set, moulding cover (12) adopt rubber materials.

2. The device of claim 1, wherein the device comprises: an oxygen aerator (21) is arranged on the inner wall of the upper end of the nitrification tank (102), and the output end of the oxygen aerator (21) penetrates into the water.

3. The device of claim 1, wherein the device comprises: the outer surfaces of the extension rod (15), the attachment rod (16) and the rod thorn (17) are coated with inorganic salt.

4. The device of claim 1, wherein the device comprises: the diffusion cover (8) is horn-shaped, and the horn mouth of the diffusion cover (8) is arranged outwards.

5. The device of claim 1, wherein the device comprises: the liquid inlet pipe (3) is obliquely arranged.

6. The device of claim 1, wherein the device comprises: the inner walls of the lower ends of the two flushing boxes (5) are obliquely arranged, and the openings of the flushing boxes (5) are downwards flushed in the oblique direction.

7. The device of claim 1, wherein the device comprises: the inner wall of the lower end of the nitrification tank (102) is in a shape of a reversed hopper.

8. The device of claim 1, wherein the device comprises: the opening at the upper end of the air outlet pipe (20) is rotatably connected with a cover plate.

9. The disinfection treatment method of the disinfection device for advanced nitrogen and phosphorus removal of municipal sewage according to claim 1, which is characterized in that: the method comprises the following steps:

s1, firstly, putting the pre-adjusted ammoniated bacteria group into an ammoniation tank (101) through a feeding pipe (4), and sewage enters a tank body (1) through a liquid inlet pipe (3) to be ammoniated in the ammoniation tank (101); putting denitrifying bacteria into a denitrifying tank (103) through a feeding pipe (4);

s2, putting prepared nitrite flora and phosphorus-accumulating flora into a nitrification tank (102) through a feeding pipe (4), pumping water in an ammoniation tank (101) into the nitrification tank (102) through a liquid conveying pipe (2), culturing the nitrate flora on an extension rod (15), an attachment rod (16) and a rod thorn (17) in advance, supplying oxygen into the nitrification tank (102) through an aeration fan (6) through an aeration pipe (7), generating nitrification in the process, and discharging sludge through a sludge discharge pipe (18) in time;

s3, the prepared denitrifying bacteria are put into a denitrifying tank (103) through a feeding pipe (4) to generate denitrification in an anaerobic environment, and the generated nitrogen is discharged through an air outlet pipe (20).

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