CN207002518U - A kind of nitrogenous effluent heterotrophic nitrification aerobic denitrifying biological treatment device - Google Patents

Abstract

The utility model discloses a heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogen-containing waste water. The device includes a first reaction pool and a second reaction pool connected to each other; a water inlet is provided at the lower part of the first reaction pool, and a first membrane filtration unit is provided at the place where the first reaction pool and the second reaction pool communicate with each other ; The second reaction tank is separated by a baffle into a baffle area and a heterotrophic nitrification-aerobic denitrification area; the bottom of the heterotrophic nitrification-aerobic denitrification area is provided with an aeration system, and the upper part is provided with a three-phase separation device and water outlet, the position of the water outlet is higher than the three-phase separator. The utility model utilizes the combination of heterotrophic nitrification-aerobic denitrification zone and membrane separation, and uses heterotrophic nitrification-aerobic denitrification bacteria to strengthen the treatment of nitrogen-containing wastewater, which has small footprint, high denitrification efficiency, and load impact resistance Strong, no sludge bulking and other advantages.

Description

A heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogenous wastewater

technical field

The utility model belongs to the technical field of environmental engineering. More specifically, it relates to a heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogenous wastewater.

Background technique

With the increase of population and the rapid development of industry and agriculture, nitrogen pollution in water is becoming more and more serious. On the one hand, nitrogen pollution causes water eutrophication, on the other hand, it also has serious harm to aquatic organisms and human health. Therefore, the treatment of nitrogen pollution in wastewater has become an urgent requirement.

At present, there are mainly physical, chemical and biological methods for the treatment of nitrogen pollution in wastewater at home and abroad. Because biological nitrogen removal can convert inorganic nitrogen into N2, its feasibility and economy are better than other nitrogen removal methods. Therefore, more biological methods are currently used for denitrification. Correspondingly, related biological denitrification treatment devices have been developed (CN205821126U, CN205398323U, CN205740642U, CN205740641U, CN204474497U, CN204981333U, CN204039219U, CN205528301U). However, the traditional biological denitrification process includes aerobic nitrification process and anaerobic denitrification process. The time and space of aerobic nitrification and anaerobic denitrification in this process are not synchronized, which makes the whole denitrification process longer and affects the biological process. Nitrogen removal efficiency and system stability. When the concentration of ammonia nitrogen and nitrate nitrogen in raw water is high, such as livestock and poultry breeding wastewater, landfill leachate, etc., it is difficult to achieve standard discharge by using traditional biological denitrification. To address these shortcomings, an integrated short-range nitrification-denitrification denitrification method has been developed (CN201510583899.9). These biological denitrification processes are basically completed by using autotrophic nitrifying bacteria in the aerobic process and denitrifying bacteria in the anaerobic process.

In recent years, people have discovered bacteria species with heterotrophic nitrification-aerobic denitrification, which can realize nitrification and denitrification in one reactor, and can simultaneously remove COD and nitrogen; in addition, this type of bacteria is heterotrophic In addition, the required substrates are diverse, and the growth rate is faster than that of autotrophic nitrifying bacteria, which is conducive to the rapid completion of the nitrification process, which can further improve the efficiency of wastewater denitrification and reduce the energy consumption of the entire sewage treatment process. The patent application number CN201010210292.3 discloses a method for treating carbon and nitrogen pollutants in wastewater by using heterotrophic nitrification-aerobic denitrification bacteria in one step. Oxygen denitrification bacteria are used to remove nitrogen and organic matter, but because heterotrophic nitrification-aerobic denitrification bacteria are easily inhibited by other microorganisms in the water body, the treatment effect is reduced; moreover, the existing traditional denitrification devices are also difficult to apply Efficient nitrogen removal by heterotrophic nitrifying-aerobic denitrifying bacteria.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the defects and deficiencies in the above-mentioned prior art that heterotrophic nitrification-aerobic denitrification bacteria cannot be used for efficient denitrification, and to provide a nitrogen-containing wastewater heterotrophic nitrification-aerobic denitrification organism Processing device.

Above-mentioned purpose of the utility model is given to realize by following technical scheme:

A nitrogen-containing wastewater heterotrophic nitrification-aerobic denitrification biological treatment device, including a first reaction pool 1 and a second reaction pool 2 connected to each other; the lower part of the first reaction pool 1 is provided with a water inlet 11, the first A first membrane filtration unit 3 is arranged at the interconnection between the reaction pool 1 and the second reaction pool 2; the second reaction pool 2 is separated into a baffle area 5 and a heterotrophic nitrification-aerobic denitrification area by a baffle plate 4 6. An aeration system 61 is installed at the bottom of the heterotrophic nitrification-aerobic denitrification zone 6, and a three-phase separator 62 and a water outlet 63 are installed at the upper part, and the location of the water outlet is higher than the three-phase separator 62.

Wherein, the first reaction tank 1 pretreats the wastewater; the first membrane filtration unit 3 retains macromolecules and microorganisms to improve the efficiency of subsequent heterotrophic nitrification-aerobic denitrification biological denitrification; The baffle effect of the flow plate 4 and the heterotrophic nitrification-aerobic denitrification bacteria in the heterotrophic nitrification-aerobic denitrification zone 6 are fully mixed to perform aerobic denitrification, and further remove total nitrogen, ammonia nitrogen, and sub Nitrate nitrogen or nitrate nitrogen, while removing part of COD; the aeration system 61 provides sufficient oxygen for the aerobic denitrification of heterotrophic nitrification-aerobic denitrification bacteria; the three-phase separator 62 can intercept suspended solids in sewage (SS), while avoiding the loss of heterotrophic nitrification-aerobic denitrification bacteria, make the discharged wastewater meet the standard.

Preferably, the device also includes a carbon source adjustment system 7 connected to the first reaction pool 1 and the second reaction pool 2; when the carbon-to-nitrogen ratio (C/N) of nitrogen-containing wastewater is less than 3, the carbon source system 7 can be Automatically adjust C/N to make it greater than 3, so as to facilitate the biological denitrification by heterotrophic nitrification-aerobic denitrification bacteria.

Preferably, the heterotrophic nitrification-aerobic denitrification zone 6 is also provided with a second membrane filtration unit 64, the position of the second membrane filtration unit 64 is between the three-phase separator 62 and the water outlet 63; the second membrane filtration The unit 64 can further filter the organic matter and suspended solids in the waste water, so that the waste water can reach a higher discharge standard.

Preferably, the first reaction tank 1 is a sequencing batch biological reaction tank, and the nitrogen-containing wastewater is subjected to four cycles of operation treatment in the sequencing batch biological reaction tank to initially remove total nitrogen, ammonia nitrogen, nitrite nitrogen or nitrate Nitrogen, while removing part of COD, SS, etc.; the C/N ratio in the reaction process is not less than 3, and the MLSS concentration is greater than 1000mg/L.

Preferably, the membrane pore size of the first membrane filtration unit 3 is 0.1-1.0 μm to retain activated sludge (microorganisms).

Preferably, the membrane pore size of the second membrane filtration unit 64 is 0.1-10 μm, and the specific pore size can be selected according to the requirements of effluent water quality.

Preferably, the lower end of the baffle plate 4 is bent toward the heterotrophic nitrification-aerobic denitrification zone 6, and the vertical angle is 15-75°, so that the nitrogen-containing wastewater passing through the baffle zone 5 can be better integrated with the heterotrophic nitrification zone. - Heterotrophic nitrifying-aerobic denitrifying bacteria in aerobic denitrification zone 6 mixed.

Preferably, the three-phase separators 62 are arranged side by side, and the horizontal angle between the three-phase separators 62 is 30-75°, which is used to separate gas-liquid-solid three-phase.

Preferably, an aeration system is also provided at the bottom of the baffle area 5, so that the baffle area 5 maintains an aerobic environment.

Preferably, a first water pump 71 and a second water pump 72 are respectively provided at the connection between the carbon source adjustment system 7 and the first reaction pool 1 and the second reaction pool 2 .

During the actual operation of the above-mentioned device of the utility model, the nitrogen-containing wastewater first enters the sequencing batch type biological reaction tank 1, and initially performs biological treatment to remove some organic matter and nitrogen-containing pollutants; then the wastewater enters the baffle area 5 through the first membrane unit 3 , the nitrogen-containing wastewater is guided by the baffle plate 4, directly enters the heterotrophic nitrification-aerobic denitrification zone 6, and is fully mixed with the heterotrophic nitrification-aerobic denitrification bacteria in the heterotrophic nitrification-aerobic denitrification zone 6 , use the dominant heterotrophic nitrification-aerobic denitrification bacteria to carry out biological denitrification treatment on wastewater under aerobic conditions; then the wastewater is separated by the three-phase separator 62, and is filtered again by the second membrane unit 64, and finally the effluent meet emission standards.

Compared with the prior art, the utility model has the following beneficial effects:

The heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogen-containing wastewater of the utility model uses a membrane separation unit, combines heterotrophic nitrification-aerobic denitrification with a three-phase separator, and fully utilizes heterotrophic nitrification-aerobic denitrification bacteria Nitrification and denitrification can be realized in one reactor, and COD can be removed simultaneously; the whole device has the advantages of high denitrification efficiency, low energy consumption for sewage treatment, strong load impact resistance, and no sludge bulking.

Description of drawings

Fig. 1 is a sectional view of the heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogenous wastewater of the present invention.

Legend: 1-first reaction tank; 11-water inlet; 2-second reaction tank; 3-first membrane filtration unit; 4-baffle plate; 5-baffle area; 6-heterotrophic nitrification-aerobic Denitrification zone; 61-aeration system; 62-three-phase separator; 63-water outlet; 64-second membrane filtration unit; 7-carbon source adjustment system; 71-first water pump; 72-second water pump.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. Wherein, the accompanying drawings are only for illustrative purposes, and represent only schematic diagrams, rather than actual drawings, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the present utility model, some parts of the accompanying drawings will be omitted , enlarged or reduced, does not represent the size of the actual product.

Example 1

A heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogen-containing wastewater, comprising a first reaction pool 1 and a second reaction pool 2 connected to each other; the lower part of the first reaction pool 1 is provided with a water inlet 11, the second A first membrane filtration unit 3 is arranged at the place where the first reaction tank 1 and the second reaction tank 2 communicate with each other; the second reaction tank 2 is separated by a baffle plate 4 into a baffle area 5 and heterotrophic nitrification-aerobic denitrification Zone 6; the bottom of the heterotrophic nitrification-aerobic denitrification zone 6 is provided with an aeration system 61, and the upper part is provided with a three-phase separator 62 and a water outlet 63, and the position of the water outlet 63 is higher than the three-phase separator 62; The heterotrophic nitrification-aerobic denitrification zone 6 is also provided with a second membrane filtration unit 64, and the position of the second membrane filtration unit 64 is between the three-phase separator 62 and the water outlet 63; A carbon source adjustment system 7 connected to the reaction tank 1 and the second reaction tank 2 .

The first reaction tank 1 is a sequencing batch bioreactor.

Wherein, the first reaction tank 1 pretreats the wastewater; the first membrane filtration unit 3 retains macromolecules and microorganisms to improve the efficiency of subsequent heterotrophic nitrification-aerobic denitrification biological denitrification; The baffle effect of the flow plate 4 and the heterotrophic nitrification-aerobic denitrification bacteria in the heterotrophic nitrification-aerobic denitrification zone 6 are fully mixed to perform aerobic denitrification, and further remove total nitrogen, ammonia nitrogen, and sub Nitrate nitrogen or nitrate nitrogen, while removing part of COD; the aeration system 61 provides sufficient oxygen for the aerobic denitrification of heterotrophic nitrification-aerobic denitrification bacteria; the three-phase separator 62 can intercept suspended solids in sewage (SS), while avoiding the loss of heterotrophic nitrification-aerobic denitrification bacteria, make the discharged wastewater meet the standard.

And when the carbon-to-nitrogen ratio (C/N) of nitrogen-containing wastewater is less than 3, the carbon source system 7 can automatically adjust the C/N to be greater than 3, which is beneficial to the biological denitrification by heterotrophic nitrifying-aerobic denitrifying bacteria.

In addition, the second membrane filtration unit 64 can further filter the organic matter and suspended matter in the waste water, so that the waste water can meet higher discharge standards.

During the actual operation of the device, the nitrogen-containing wastewater first enters the sequencing batch biological reaction tank 1 for preliminary biological treatment to remove some organic matter and nitrogen-containing pollutants; Under the guidance of the baffle plate 4, the wastewater directly enters the heterotrophic nitrification-aerobic denitrification zone 6, and is fully mixed with the heterotrophic nitrification-aerobic denitrification bacteria in the heterotrophic nitrification-aerobic denitrification zone 6, taking advantage of The heterotrophic nitrification-aerobic denitrification bacteria carry out biological denitrification treatment on the wastewater under aerobic conditions; then the wastewater is separated by the three-phase separator 62, and is filtered again by the second membrane unit 64, and finally the effluent reaches the discharge standard .

The membrane pore diameter of the first membrane filtration unit 3 is 0.5 μm.

The horizontal angle of the three-phase separator 62 in the heterotrophic nitrification-aerobic denitrification zone 6 is 55°.

The membrane pore diameter of the second membrane filtration unit 64 is 1 μm.

An aeration system is set at the bottom of the sequencing batch bioreactor 1, the baffle zone 5 and the heterotrophic nitrification-aerobic denitrification zone 6.

For livestock and poultry breeding wastewater, the scale is 50m ³ /d, and the treatment results are shown in the table below:

It can be seen that the above-mentioned heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogen-containing wastewater is used to treat livestock and poultry breeding wastewater, and all indicators of the treated wastewater meet the discharge standards.

Claims (8)

1. A heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogenous wastewater, characterized in that it includes a first reaction pool (1) and a second reaction pool (2) connected to each other; the first reaction pool ( The lower part of 1) is provided with a water inlet (11), and the first membrane filtration unit (3) is provided at the interconnection between the first reaction pool (1) and the second reaction pool (2); the second reaction pool (2) ) is separated by a baffle (4) into a baffle area (5) and a heterotrophic nitrification-aerobic denitrification area (6); the bottom of the heterotrophic nitrification-aerobic denitrification area (6) is provided with an aeration system (61), the upper part is provided with a three-phase separator (62) and a water outlet (63), and the position of the water outlet is higher than the three-phase separator (62). 2. The heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogenous wastewater according to claim 1, characterized in that it also includes carbon dioxide connected to the first reaction pool (1) and the second reaction pool (2) respectively. Source conditioning system (7). 3. The nitrogen-containing wastewater heterotrophic nitrification-aerobic denitrification biological treatment device according to claim 1, characterized in that, the heterotrophic nitrification-aerobic denitrification zone (6) is also provided with a second membrane filtration unit (64), the second membrane filtration unit (64) is located between the three-phase separator (62) and the water outlet (63). 4. The nitrogen-containing wastewater heterotrophic nitrification-aerobic denitrification biological treatment device according to claim 1, characterized in that, the first reaction tank (1) is a sequencing batch biological reaction tank. 5 . The heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogenous wastewater according to claim 1 , characterized in that the membrane pore diameter of the first membrane filtration unit ( 3 ) is 0.1-1.0 μm. 6. The heterotrophic nitrification-aerobic denitrification biological treatment device for nitrogenous wastewater according to claim 3, characterized in that the membrane pore diameter of the second membrane filtration unit (64) is 0.1-10 μm. 7. The nitrogen-containing wastewater heterotrophic nitrification-aerobic denitrification biological treatment device according to claim 1, characterized in that an aeration system is also arranged at the bottom of the baffle area (5). 8. The nitrogen-containing wastewater heterotrophic nitrification-aerobic denitrification biological treatment device according to claim 2, characterized in that the carbon source adjustment system (7) is connected with the first reaction pool (1) and the second reaction pool (2) A first water pump ( 71 ) and a second water pump ( 72 ) are respectively arranged at the connection points.