CN203582586U - Self-circulation denitrification reactor adopting sectional oxygen supply - Google Patents

Abstract

The utility model discloses a segmental oxygen supply self-circulation denitrification reactor. The reactor body is equipped with a water distribution area, a reaction area, a separation area and a circulation area, and the water distribution area is provided with a mud discharge pipe and a water inlet pipe; the reaction area is composed of three modules to form a segmental oxygen supply joint reaction system, and the lower part of the module I is provided with an air inlet pipe , the upper end of the air intake pipe is provided with an aerator head, and the upper part of module I is equipped with fillers. The structures of modules II and III are the same as those of module I, and they are connected in series on top of module I in sequence; A gas collection chamber is set under the air release chamber, an overflow weir, a water outlet tank and a water outlet pipe are arranged on the upper part of the sedimentation chamber, and a scum discharge pipe is arranged on the upper part of the air release chamber; a return liquid suction pipe, a connecting pipe, a regulating valve and a return liquid discharge pipe are arranged in the circulation area. into the tube. The utility model provides segmental oxygen supply, which can meet the oxygen demand of biological reactions and strengthen the short-range nitrification; the reaction liquid circulates itself, avoids the biological toxicity caused by the accumulation of nitrite, overcomes the problem of substrate ratio regulation, and improves the denitrification efficiency of the reactor volume .

Description

A staged oxygen supply self-circulation denitrification reactor

technical field

The utility model relates to a biological denitrification reactor, in particular to a segmental oxygen supply self-circulation denitrification reactor.

Background technique

After the pollution control and emission reduction during the "Eleventh Five-Year Plan" period, the chemical oxygen demand has been effectively controlled, and ammonia nitrogen pollution has become a major environmental problem. According to the Environmental Status Bulletin issued by the Ministry of Environmental Protection, in 2011, the national discharge of ammonia nitrogen in wastewater was 2.604 million tons, and ammonia nitrogen has become the main pollution indicator of the seven major water systems. After the organic pollutants are removed, the low carbon-to-nitrogen ratio becomes the main water quality characteristic of non-standard wastewater. Since the C/N ratio of substandard wastewater often cannot meet the value required by traditional denitrification technologies, the biological treatment of such wastewater faces severe challenges. Therefore, the biological treatment of wastewater with low carbon-to-nitrogen ratio has become a major issue in the field of environmental pollution control.

The short-cut nitrification-anammox process is an autotrophic biological denitrification process. The nitrous bacteria and anammox bacteria involved in this process are all autotrophic microorganisms and do not need to add organic carbon sources. The emergence of this new process has brought hope to the biological treatment of wastewater with low carbon-to-nitrogen ratio, so it is favored by the environmental engineering field. However, in the traditional design, the short-cut nitrification process and the anammox process are usually divided into two devices, which is easy to cause nitrite accumulation, inhibit ammonia oxidation, and limit the efficiency of the process; in addition, due to the anammox The ratio of ammonia nitrogen and nitrite nitrogen required by the oxidation process is 1:1.32, which is difficult to control in actual engineering. If the two processes can be carried out in the same device, so that nitrite can be used while producing, then the above-mentioned predicament can be overcome.

The utility model integrates short-range nitrification and anaerobic ammonium oxidation, which can reduce the occupied area; the spatial distribution of functional bacteria is relatively fixed, which is conducive to micro-ecological optimization; segmental oxygen supply can meet the needs of biological reactions for oxygen, and strengthen short-range Nitrification: The reaction liquid is self-circulating, and nitrification and denitrification are carried out alternately, which can avoid the biological toxicity caused by the accumulation of nitrite, and can also overcome the problem of substrate ratio regulation and improve the efficiency of volumetric denitrification.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a self-circulation denitrification reactor with segmented oxygen supply.

The body of the staged oxygen supply self-circulation denitrification reactor is equipped with a water distribution area, a reaction area, a separation area and a circulation area; the specific structure includes a sludge discharge pipe, a water flow mixing distribution chamber, a return liquid input port, a water inlet pipe, an air inlet pipe, and an exposure pipe. Gas head, packing bracket, porous packing, return pipe, deflector, regulating valve, return liquid output port, inclined plate of gas collection chamber, gas collection chamber, top plate of gas collection chamber, exhaust port of gas collection chamber, bottom plate of sedimentation chamber Upper deflector, release chamber, settling chamber, scum discharge pipe, outlet pipe, outlet tank, overflow weir, longitudinal partition;

The water distribution area is located at the lower part of the reactor body, and is divided into a water distribution gradual expansion section and a water distribution cylinder section. The water distribution area is equipped with a water flow mixing chamber, and the bottom of the water flow mixing chamber is equipped with a mud discharge pipe. The input port is equipped with a water inlet pipe on the upper part of the water flow mixing chamber;

The reaction zone is located in the middle of the reactor body. Module I, module II and module III are vertically connected in series to form a segmented oxygen supply joint reaction system. The lower part of module I, the lower part of module II and the lower part of module III are respectively equipped with aeration heads and connected The trachea is connected, and the upper part of module I, the upper part of module II and the upper part of module III are respectively provided with packing brackets, and porous packing is filled in the packing brackets;

The separation zone is located on the upper part of the reactor body, and consists of a small separation cylinder section, a separation expansion section, and a separation large cylinder section.

There is a gas collection chamber in the separation small cylinder section and the separation gradual expansion section,

The upper part of the gas collection chamber is provided with a sloping plate and a top plate, and the top plate is provided with an exhaust port of the gas collection chamber and an upward flow port of the mixed liquid in the reaction zone.

The separation large cylinder section is equipped with a degassing chamber and a sedimentation chamber,

The air release chamber is surrounded by the inner wall of the separated large cylinder section, the longitudinal partition, the bottom plate of the sedimentation chamber, the inclined plate and the roof of the air collection chamber, and the upper part of the air release chamber is provided with a scum discharge pipe.

The slit between the sloping plate of the gas collection chamber and the bottom plate of the sedimentation chamber forms the return channel of the rising mixed liquid;

The sedimentation chamber is surrounded by the inner wall of the separation gradual expansion section, the inner wall of the separation large cylinder section, the longitudinal partition and the bottom plate of the sedimentation chamber. An overflow weir and an outlet tank are arranged on the medial partition of the sedimentation chamber, and an outlet pipe is arranged at the bottom of the outlet tank;

The circulation area is located outside the reactor body, and is composed of a reflux liquid output port, a reflux pipe, a reflux liquid input port and a reflux regulating valve. On the outer wall of the middle part of the expansion section, the backflow regulating valve is arranged on the backflow pipe.

The ratio of the heights of the water distribution area, the reaction area and the separation area is 1:2.5-3.5:1.0-1.2.

The angle between the outer wall of the water distribution gradual expansion section and the horizontal plane is 45°~55°, the ratio of the height of the water distribution gradual expansion section to the water distribution cylinder section is 1~2:1, and the water distribution gradual expansion section crosses the top and bottom The area ratio is 2~4:1.

The lower part of the module I, the lower part of the module II and the lower part of the module III are respectively provided with an oxygen supply chamber, and the upper part of the module I, the upper part of the module II and the upper part of the module III are respectively provided with a stuffing chamber, and the ratio of the height of the oxygen supply chamber to the stuffing chamber is 1:1.5~2.5.

The ratio of the upper and lower cross-sectional areas of the separation and diverging section is 2-4:1, and the volume ratio of the gas collection chamber, the gas release chamber and the precipitation chamber is 1:1.5-2.5:2.5-3.5.

The deflector is two sloping plates with an included angle of 45°~55° to the horizontal plane, and the ratio of the projected area of the sloping plate, the sloping plate and the top plate of the deflector is 1:1~1.5:1; The ratio of the slit area between the inclined plate and the deflector to the cross-sectional area of the separated small cylinder section is 5~10:1; the cross-sectional area of the separated small cylinder section to the cross-sectional area of the exhaust port The ratio of cross-sectional area is 36~64:1.

The angle between the bottom plate of the sedimentation chamber and the horizontal plane is 45° to 55°, the lower end of the bottom plate of the sedimentation chamber and the inner wall of the separation and expansion section enclose the water inlet of the sedimentation chamber, and the ratio of the area of the water inlet of the sedimentation chamber to the cross-sectional area of the sedimentation chamber 1~2:5.

The ratio of the cross-sectional area of the degassing chamber to the settling chamber is 1:5~10; the bottom plate of the settling chamber is parallel to the slanted plate of the gas collecting chamber, and the included angle with the horizontal plane is 50°~60°; the distance between the two plates The ratio of the vertical distance to the height of the separated large cylinder section is 1:5~7, the overlapping length between the two plates is 1:2~3 to the length of the bottom plate of the sedimentation chamber; the bottom plate of the sedimentation chamber and the inclined plate of the gas collection chamber The ratio of the area of the slit between, the cross-sectional area of the release chamber, and the cross-sectional area of the large separating cylinder is 3~8:1:5~10.

Compared with the existing biological denitrification technology, the utility model has obvious advantages: the integration of short-range nitrification and anaerobic ammonia oxidation can reduce the area occupied by the device; the spatial distribution of functional bacteria is relatively fixed, which is conducive to micro-ecological optimization ;Segmented oxygen supply can meet the oxygen demand of biological reactions and strengthen short-term nitrification; the self-circulation of reaction liquid can make nitrification and denitrification alternately, avoid biological toxicity caused by nitrite accumulation, and overcome the problem of substrate ratio regulation. Improve the denitrification efficiency of the reactor volume.

Description of drawings

Figure 1 is a schematic diagram of the structure of a self-circulating denitrification reactor with staged oxygen supply.

Detailed ways

As shown in Figure 1, the body of the staged self-circulation denitrification reactor with oxygen supply is equipped with a water distribution area A, a reaction area B, a separation area C, and a circulation area D; Liquid input port 3, water inlet pipe 4, air intake pipe 5, aerator head 6, packing bracket 7, porous packing 8, return pipe 9, deflector 10, regulating valve 11, return liquid output port 12, inclined plate of the gas collection chamber 13. Gas collection chamber 14, top plate of gas collection chamber 15, air outlet of gas collection chamber 16, bottom plate of sedimentation chamber and upper guide plate 17, degassing chamber 18, sedimentation chamber 19, scum discharge pipe 20, water outlet pipe 21, Outlet tank 22, overflow weir 23, longitudinal partition 24;

The water distribution area A is located at the lower part of the reactor body, and is divided into a water distribution gradual expansion section A1 and a water distribution cylinder section A2. The water distribution area A is equipped with a water flow mixing chamber 2, and the bottom of the water flow mixing chamber 2 is equipped with a mud discharge pipe 1 for water distribution. The middle part of the mixing chamber 2 is provided with a reflux liquid input port 3, and the upper part of the water flow mixing chamber 2 is provided with a water inlet pipe 4;

Reaction zone B is located in the middle of the reactor body, and consists of module I, module II and module III vertically connected in series to form a segmented oxygen supply joint reaction system. The lower part of module I, the lower part of module II and the lower part of module III are respectively equipped with aeration heads 6 and Connected with the intake pipe 5, the upper part of the module I, the upper part of the module II and the upper part of the module III are respectively provided with a filling bracket 7, and the filling bracket 7 is filled with a porous filler 8;

The separation zone C is located on the upper part of the reactor body, and is composed of a small separation cylinder section C1, a separation expansion section C2, and a separation large cylinder section C3.

A gas collection chamber 14 is provided in the separation small cylinder section C1 and the separation gradual expansion section C2,

The upper part of the gas collection chamber 14 is provided with a sloping plate 13 and a top plate 15, and the top plate 15 is provided with an exhaust port 16 of the gas collection chamber and an upper flow port of the mixed liquid in the reaction zone. Plenum deflector 10,

Separating the large cylinder section C3 is provided with an air release chamber 18 and a sedimentation chamber 19,

The degassing chamber 18 is surrounded by the inner wall of the separated large cylinder section C3, the longitudinal partition 24, the bottom plate 17 of the sedimentation chamber, the sloping plate 13 and the top plate 15 of the gas collection chamber, and a scum discharge pipe 20 is arranged on the top of the degassing chamber 18,

The slit between the sloping plate 13 of the gas collection chamber and the bottom plate 17 of the sedimentation chamber constitutes a backflow channel for the rising mixed liquid;

The sedimentation chamber 19 is surrounded by the inner wall of the separation gradual expansion section C2, the inner wall of the separation large cylinder section C3, the longitudinal partition 24 and the bottom plate 17 of the sedimentation chamber. Outlet pipe 21;

The circulation zone D is located outside the reactor body, and is composed of a reflux liquid output port 12, a reflux pipe 9, a reflux liquid input port 3 and a reflux regulating valve 11. The input port 3 is set on the outer wall of the middle part of the water distribution gradual expansion section A1, and the backflow regulating valve is set on the backflow pipe 9 .

The ratio of the heights of the water distribution area A, the reaction area B and the separation area C is 1:2.5~3.5:1.0~1.2.

The angle between the outer wall of the water distribution gradual expansion section A1 and the horizontal plane is 45°~55°, the ratio of the height of the water distribution gradual expansion section A1 to the water distribution cylinder section A2 is 1~2:1, and the water distribution gradual expansion section The ratio of the upper and lower cross-sectional areas of A1 is 2~4:1.

The lower part of the module I, the lower part of the module II and the lower part of the module III are respectively provided with an oxygen supply chamber B1, and the upper part of the module I, the upper part of the module II and the upper part of the module III are respectively provided with a packing chamber B2, and the oxygen supply chamber B1 and the packing chamber B2 The height ratio is 1:1.5~2.5.

The ratio of the upper and lower cross-sectional areas of the separating and expanding section C2 is 2-4:1, and the volume ratio of the gas-collecting chamber 14, the gas-releasing chamber 18 and the settling chamber 19 is 1:1.5-2.5:2.5-3.5.

The deflector 10 is two inclined plates whose included angles with the horizontal plane are 45°~55°, and the ratio of the projected areas of the inclined plate, the inclined plate 13 and the top plate 15 of the deflector 10 is 1:1~ 1.5:1; the ratio of the slit area between the inclined plate 13 and the deflector to the cross-sectional area of the separating small cylinder section C1 is 5~10:1; the ratio of the cross-sectional area of the separating small cylinder section C1 to the set The cross-sectional area ratio of the gas chamber exhaust port 16 is 36-64:1.

The included angle between the bottom plate 17 of the settling chamber and the horizontal plane is 45° to 55°, and the lower end of the bottom plate 17 of the settling chamber and the inner wall of the separation gradual expansion section C2 enclose the water inlet of the settling chamber, and the area of the water inlet of the settling chamber is the same as the cross section of the settling chamber The area ratio is 1~2:5.

The ratio of the cross-sectional area of the degassing chamber 18 to the settling chamber 19 is 1:5-10; the bottom plate 17 of the settling chamber is parallel to the inclined plate 13 of the gas-collecting chamber, and the included angle with the horizontal plane is 50°-60°. The ratio of the vertical distance between the plates to the height of the separating large cylinder section C3 is 1:5~7, and the ratio of the overlapping length between the two plates to the length of the bottom plate 17 of the sedimentation chamber is 1:2~3; the bottom plate of the sedimentation chamber The ratio of the area of the slit between 17 and the inclined plate 13 of the gas collection chamber, the cross-sectional area of the air release chamber 18, and the cross-sectional area of the separating large cylinder section C3 is 3~8:1:5~10.

The sectional oxygen supply self-circulation denitrification reactor can be made of PVC board or steel plate, and its working process is as follows: the wastewater containing ammonia nitrogen enters the reactor through the water inlet pipe 4 of the water distribution area A, and the air passes through three parts I, II and III at the same time. The air inlet pipe 5 below the module (take module II as an example) enters the reactor, and after being cut by the aeration head 6, it overflows from the surface in the form of microbubbles, rapidly mixes with the mud-water mixture in the nearby area, and drives it up along the reaction zone B . The rapid rise of the air and mud-water mixture will form a negative pressure in the water flow mixing distribution chamber 2, sucking the reflux liquid in the reflux liquid inlet pipe 3.

In the reaction zone B, there is a biofilm on the porous filler 8. During the contact process with the rising mud-water mixture, the dissolved oxygen and ammonia nitrogen in the main body of the liquid phase can be taken up. Under the action of nitrosating bacteria, part of the ammonia nitrogen is oxidized into nitrite. Nitrite and unoxidized ammonia nitrogen enter the filler through mass transfer, and continue to be converted into nitrogen under the action of anammox bacteria, and the nitrogen escapes through the gaps inside the filler. The conversion of nitrite while it is produced can avoid the biological toxicity caused by the accumulation of nitrite caused by excessive nitrification. In addition, the flocculent sludge circulating with the main body of the liquid phase will also participate in the short-cut nitrification and anammox processes.

The mud-water mixture and most of the tail gas enter the release chamber 18 through the exhaust port 16 of the gas collection chamber, and the separation of the gas and the mud-water mixture occurs. The exhaust gas escapes to the external environment through the liquid surface, and the mud-water mixture enters the bottom of the sedimentation chamber 19 through the diversion channel between the upper deflector 17 and the inclined plate 13 of the gas collection chamber. Most of the mud-water mixture returns to the reaction zone, and a small part of the mud-water mixture enters the sedimentation chamber 19 for mud-water separation. The supernatant flows into the water outlet tank 22 through the overflow weir 23, and is discharged through the water outlet pipe 21, and the precipitated sludge is directly returned to the reaction area. Part of the muddy water mixture returns to the water distribution area A through the reflux liquid output port 12, the reflux pipe 9, and the reflux liquid input port 3, and indirectly returns to the reaction area.

The key to high-efficiency biological denitrification in the utility model lies in the strengthening of gas supply and the self-circulation of mixed liquid. The staged oxygen supply ensures the oxygen required for ammonia oxidation, and the self-circulation of the mixed liquid driven by air lift ensures the re-oxidation of residual ammonia and coordinates the ratio between ammonia nitrogen and nitrite nitrogen required for anaerobic ammonium oxidation.

Claims (8)

1. A segmented oxygen self-circulation denitrification reactor, characterized in that: the reactor body is equipped with a water distribution area (A), a reaction area (B), a separation area (C) and a circulation area (D); specifically The structure includes mud discharge pipe (1), water flow mixing distribution chamber (2), return liquid input port (3), water inlet pipe (4), air inlet pipe (5), aeration head (6), packing bracket (7), Porous packing (8), return pipe (9), deflector (10), regulating valve (11), return liquid output port (12), inclined plate of air collection chamber (13), air collection chamber (14), collection Air chamber top plate (15), gas collection chamber exhaust port (16), sedimentation chamber bottom plate and upper deflector (17), degassing chamber (18), sedimentation chamber (19), scum discharge pipe (20), Outlet pipe (21), outlet trough (22), overflow weir (23), longitudinal partition (24); The water distribution area (A) is located at the lower part of the reactor body and is divided into a water distribution gradual expansion section (A1) and a water distribution cylinder section (A2). The water distribution area (A) is equipped with a water flow mixing chamber (2), and a water flow mixing chamber ( 2) There is a mud discharge pipe (1) at the bottom, a reflux liquid input port (3) is provided in the middle of the water flow mixing chamber (2), and a water inlet pipe (4) is provided at the upper part of the water flow mixing chamber (2); The reaction zone (B) is located in the middle of the reactor body. Module I, module II and module III are vertically connected in series to form a segmented oxygen supply combined reaction system. The lower part of module I, the lower part of module II and the lower part of module III are respectively equipped with aeration heads. (6) and connected with the intake pipe (5), the upper part of the module I, the upper part of the module II and the upper part of the module III are respectively equipped with packing brackets (7), and the packing brackets (7) are filled with porous packing (8); The separation zone (C) is located on the upper part of the reactor body and consists of a small separation cylinder section (C1), a separation expansion section (C2), and a separation large cylinder section (C3). There is a gas collection chamber (14) in the separation small cylinder section (C1) and the separation diverging section (C2), The upper part of the gas collection chamber (14) is provided with a sloping plate (13) and a top plate (15). A deflector (10) for the air collection chamber is provided at the lower part corresponding to the end of the inclined plate (13), The separation large cylinder section (C3) is equipped with a degassing chamber (18) and a sedimentation chamber (19), The degassing chamber (18) is surrounded by the inner wall of the separated large cylinder section (C3), the medial septum (24), the bottom plate of the sedimentation chamber (17), the sloping plate of the gas collection chamber (13) and the top plate (15), and the degassing chamber (18 ) is provided with a scum discharge pipe (20) on the upper part, The slit between the sloping plate (13) of the gas collection chamber and the bottom plate (17) of the sedimentation chamber forms the return channel of the rising mixed liquid; The sedimentation chamber (19) is surrounded by the inner wall of the separation gradual expansion section (C2), the inner wall of the separation large cylinder section (C3), the longitudinal partition (24) and the bottom plate (17) of the sedimentation chamber, and an overflow is set on the sedimentation chamber longitudinal partition (24). A weir (23) and a water outlet trough (22), and an outlet pipe (21) is arranged at the bottom of the water outlet trough (22); The circulation zone (D) is located outside the reactor body and consists of the reflux liquid output port (12), the reflux pipe (9), the reflux liquid input port (3) and the reflux regulating valve (11). The reflux liquid output port (12) is set On the outer wall of the lower end of the separation gradual expansion section (C2), the reflux liquid input port (3) is arranged on the middle outer wall of the water distribution gradual expansion section (A1), and the backflow regulating valve is arranged on the return pipe (9). 2. A staged oxygen self-circulation denitrification reactor according to claim 1, characterized in that: the height of the water distribution area (A), the reaction area (B) and the separation area (C) is between The ratio is 1:2.5~3.5:1.0~1.2. 3. A self-circulating nitrogen denitrification reactor with segmented oxygen supply according to claim 1, characterized in that: the angle between the outer wall of the water distribution gradual expansion section (A1) and the horizontal plane is 45°~55°, The height ratio of the water distribution gradual expansion section (A1) to the water distribution cylinder section (A2) is 1~2:1, and the ratio of the upper and lower cross-sectional areas of the water distribution gradual expansion section (A1) is 2~4:1. 4. A staged oxygen self-circulation denitrification reactor according to claim 1, characterized in that: the lower part of module I, the lower part of module II and the lower part of module III are respectively provided with an oxygen supply chamber (B1) , The upper part of module I, the upper part of module II and the upper part of module III are respectively provided with packing chambers (B2), and the height ratio of the oxygen supply chamber (B1) to the packing chamber (B2) is 1:1.5~2.5. 5. A self-circulation denitrification reactor with segmental oxygen supply according to claim 1, characterized in that: the ratio of the upper and lower cross-sectional areas of the separation and gradual expansion section (C2) is 2~4:1, The volume ratio of the gas collection chamber (14), the gas release chamber (18) and the precipitation chamber (19) is 1:1.5-2.5:2.5-3.5. 6. A self-circulation denitrification reactor with staged oxygen supply according to claim 1, characterized in that: the deflector (10) is two angles between 45°~55° with the horizontal plane. A sloping plate, the projected area ratio of the sloping plate of the deflector (10), the sloping plate (13) and the top plate (15) is 1:1~1.5:1; the ratio between the sloping plate (13) and the deflector The ratio of the slit area to the cross-sectional area of the separated small cylinder section (C1) is 5-10:1; The ratio of cross-sectional area is 36~64:1. 7. A self-circulation denitrification reactor with staged oxygen supply according to claim 1, characterized in that: the angle between the bottom plate (17) of the precipitation chamber and the horizontal plane is 45°~55°, and the bottom plate of the precipitation chamber (17) The lower end and the inner wall of the separation and diverging section (C2) enclose the water inlet of the sedimentation chamber, and the ratio of the water inlet area of the sedimentation chamber to the cross-sectional area of the sedimentation chamber is 1~2:5. 8. A sectional oxygen self-circulation denitrification reactor according to claim 1, characterized in that: the ratio of the cross-sectional area of the degassing chamber (18) to the precipitation chamber (19) is 1: 5~10; the bottom plate of the sedimentation chamber (17) is parallel to the inclined plate (13) of the gas collection chamber, and the included angle with the horizontal plane is 50°~60°; The ratio of the two plates is 1:5~7, and the overlapping length between the two plates is 1:2~3 with the length of the bottom plate of the sedimentation chamber (17); The ratio of the area of the slit between, the cross-sectional area of the release chamber (18) and the cross-sectional area of the large separating cylinder section (C3) is 3-8:1:5-10.

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