CN113845221A

CN113845221A - Biological carbon and nitrogen removal integrated reactor for treating organic nitrogen wastewater

Info

Publication number: CN113845221A
Application number: CN202111097403.9A
Authority: CN
Inventors: 夏子翔
Original assignee: Suzhou Tianjun Environmental Technology Co ltd
Current assignee: Suzhou Tianjun Environmental Technology Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2021-12-28

Abstract

The invention discloses a biological carbon and nitrogen removal integrated reactor for treating organic nitrogen wastewater, which comprises an anaerobic zone, an aerobic zone and an anoxic zone, wherein the anaerobic zone is connected with the aerobic zone; a water inlet pipe is arranged on one side of the anaerobic zone, and a first air-lift backflow system is arranged in the anaerobic zone; the aerobic zone is provided with an aeration device, biological suspended fillers are filled above the aeration device, and a second air-lift backflow system is arranged at the upper part of the biological suspended fillers; a sedimentation zone is arranged at the top of the anoxic zone, and a water outlet pipe is arranged at the upper part of the sedimentation zone; and the anaerobic zone and the aerobic zone, and the aerobic zone and the anoxic zone are respectively provided with a one-way water passing gallery which flows in one way. The anaerobic digestion and denitrification integrated anaerobic ammonia oxidation reactor can separate anaerobic digestion and denitrification, nitrosation and anaerobic ammonia oxidation in a single reactor, realizes integration of anaerobic digestion and denitrification, partial nitrosation and anaerobic ammonia oxidation reaction devices, and can ensure that the growth environments of the anaerobic digestion and denitrification, the partial nitrosation and the anaerobic ammonia oxidation reaction devices are not influenced with each other by simple control.

Description

Biological carbon and nitrogen removal integrated reactor for treating organic nitrogen wastewater

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a biological carbon and nitrogen removal integrated reactor for treating organic nitrogen wastewater.

Background

The treatment of organic nitrogen wastewater has been a difficult point in the wastewater treatment process. The conventional biological treatment process generally adopts an anaerobic or aerobic unit to oxidize organic matters to promote the release of ammonia nitrogen, and then adopts a nitrification and denitrification process to denitrify. In the operation process of the combined process, the removal of ammonia nitrogen is the key point of the energy consumption and material consumption of the whole process, and mainly reflects that a large amount of aeration is required to be provided in the nitration process; the denitrification process relies on additional organic addition.

Partial nitrosation-anaerobic ammonia oxidation is used as a novel autotrophic biological denitrification technology, and refers to a biochemical process that half of ammonia nitrogen is converted into nitrite by aerobic ammonia-oxygen bacteria under aerobic conditions, and then the rest ammonia nitrogen and nitrite are converted into nitrogen by anaerobic ammonia-oxygen bacteria under anaerobic conditions. Compared with the traditional nitrification and denitrification process, the method has the following advantages: (1) only part of ammonia nitrogen needs to be converted into nitrite, and the gas supply amount is saved by about 60%; (2) the whole denitrification process is autotrophic denitrification, so that the dependence of the denitrification process on organic matters is greatly reduced, and the yield of the residual sludge is reduced by about 50 percent; (3) the denitrification efficiency of the whole autotrophic denitrification process is tens of times that of the traditional denitrification process, and the cost is one tenth of that of the traditional denitrification process.

However, there are contradictions between requirements of environmental factors such as dissolved oxygen and pH between functional microorganisms mainly including aerobic ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria in a partial nitrosation-anaerobic ammonia oxidation process, and how to alleviate these contradictions is a key to realize efficient coupled denitrification of partial nitrosation-anaerobic ammonia oxidation. Meanwhile, when the method is applied to the treatment of organic nitrogen wastewater, the problem that heterotrophic microorganisms caused by high-concentration organic matters excessively breed and compete for substrates such as dissolved oxygen, nitrite and the like with the denitrification functional microorganisms is also avoided.

Anaerobic digestion can quickly and efficiently degrade high-concentration organic matters and generate biological energy sources such as methane and the like, is an effective way for realizing wastewater recycling, and can effectively ammoniate organic nitrogen to release ammonia nitrogen and create low-carbon high-ammonia water suitable for partial nitrosation-anaerobic ammonia oxidation; in addition, 11% of nitrate is generated in the partial nitrosation-anaerobic ammonia oxidation process during denitrification, so that the high ammonia nitrogen wastewater is difficult to discharge after reaching the standard during treatment, anaerobic digestion and denitrification are proved to be feasible simultaneously, and the partial nitrate nitrogen is subjected to denitrification enhanced denitrification by using organic matters in raw water, so that the total nitrogen removal efficiency can be improved, and additional carbon source addition is not needed.

In summary, a novel reaction apparatus needs to be developed to create an environment suitable for anaerobic digestion, denitrification, partial nitrosation and anammox microorganisms, and to realize efficient decarbonization and denitrification treatment of organic nitrogen wastewater.

Disclosure of Invention

The invention aims to provide an integrated reactor for biological carbon removal and denitrification for treating organic nitrogen wastewater, which is used for solving the problems in the prior art, and can realize the integration of anaerobic digestion and denitrification, partial nitrosation and anaerobic ammonia oxidation in a single reactor, and ensure that the growth environments of the three are not influenced by each other by simple control.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a biological carbon and nitrogen removal integrated reactor for treating organic nitrogen wastewater, which comprises an anaerobic zone, an aerobic zone and an anoxic zone, wherein the anaerobic zone is connected with the aerobic zone; a water inlet pipe is arranged on one side of the anaerobic zone, and a first air-lift backflow system is arranged in the anaerobic zone; the aerobic zone is provided with an aeration device, biological suspended fillers are filled above the aeration device, and a second air-lift backflow system is arranged at the upper part of the biological suspended fillers; the top of the anoxic zone is provided with a precipitation zone, the upper part of the precipitation zone is provided with a water outlet pipe, the anoxic zone adopts an upflow mode to culture anaerobic Ardisia Ampelopsis Grossdentata granular sludge so as to convert nitrite and residual ammonia nitrogen in the water outlet of the aerobic zone into nitrogen and simultaneously generate a small amount of nitrate; and the anaerobic zone and the aerobic zone, and the aerobic zone and the anoxic zone are respectively provided with a one-way water passing gallery which flows in one way.

Optionally, at least one first air-lift backflow system is arranged in the anaerobic zone, the specific number of the first air-lift backflow systems is not limited, one or more first air-lift backflow systems can be arranged, and the first air-lift backflow systems can be arranged uniformly and specifically according to needs; the first water collecting tank is communicated with the bottom of the anaerobic zone through a first backflow descending pipe. The anaerobic zone can rapidly realize the degradation of high-concentration organic nitrogen through anaerobic digestion, reduce the concentration of organic matters, convert nitrogen forms into ammonia nitrogen, and meanwhile, the nitrate carried in the reflux liquid of the second air-lift reflux system can be denitrified by utilizing the organic matters in the raw water to strengthen denitrification.

Optionally, at least one second gas-lift backflow system is arranged in the aerobic zone, the number of the second gas-lift backflow systems may be one or multiple, and is not particularly limited, when multiple second gas-lift backflow systems are arranged, the second gas-lift backflow systems are uniformly distributed in the aerobic zone, each second gas-lift backflow system comprises a second gas collecting hood distributed in the aerobic zone, each second gas collecting hood is connected with a second gas guide tube, the tail end of each second gas guide tube is connected with a flow guide tube, and the connecting end of each flow guide tube and the corresponding second gas guide tube is located in the first water collecting pool or the second water collecting pool; one end of the draft tube, which is far away from the second gas guide tube, is positioned in a sedimentation tank at the top of the anoxic zone; the second water collecting tank is connected with a second reflux descending pipe, and the tail end of the second reflux descending pipe is communicated with the aerobic zone.

Optionally, a suspended filler for intercepting nitrosobacteria is arranged in the aerobic zone, and the suspended filler can convert part or all of ammonia nitrogen in the effluent of the anaerobic zone into nitrous acid.

Optionally, the first and second air-lift reflux systems can respectively control reflux flow, the first air-lift reflux system can increase the ascending flow rate of the anaerobic zone, and the second air-lift reflux system can increase the ascending flow rate of the anaerobic zone and the anoxic zone. Nitrite and nitrate in the reflux liquid are subjected to denitrification by utilizing organic matters, so that the concentration of the organic matters in the effluent of the anaerobic zone is greatly reduced, and the denitrification efficiency of the reactor is improved; meanwhile, pH fluctuation of the anaerobic zone, the aerobic zone and the anoxic zone is balanced, the ammonia nitrogen concentration of the inlet water is diluted, and the toxicity inhibition of free ammonia is avoided.

Compared with the prior art, the invention has the following technical effects:

the anaerobic digestion is partitioned in the single reactor simultaneously with denitrification, nitrosation and anaerobic ammonia oxidation, so that the anaerobic digestion is integrated with the denitrification, partial nitrosation and anaerobic ammonia oxidation reaction devices, and the growth environments of the three devices are not influenced by each other only by simple control. The preposed anaerobic zone can quickly reduce the carbon-nitrogen ratio of organic nitrogen wastewater, degrade organic matters and release ammonia nitrogen, and simultaneously, the aeration tail gas of the nitrosation zone is used for gas lift to realize circulation reflux in the integrated reactor, thereby being beneficial to the acid-base complementation of the pH values of the anaerobic zone, the aerobic zone and the anoxic zone; the ascending flow velocity of the anaerobic zone and the anoxic zone can be improved under the condition of no extra energy consumption, the sludge-water mixing condition is increased, and the sludge granulation is promoted; and nitrate generated by anaerobic ammonia oxidation can be returned to the anaerobic zone, and the organic matters in raw water can be fully utilized for denitrification enhanced denitrification. Experimental research proves that the reactor designed and operated according to the invention has few control conditions, is simple and feasible, can avoid the impact of organic matters on an autotrophic nitrogen removal system, is beneficial to efficiently and stably realizing autotrophic nitrogen removal, and is suitable for high-concentration water inlet conditions.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an integrated reactor for biological carbon and nitrogen removal for treating organic nitrogen wastewater according to the present invention;

100, an integrated reactor for biological carbon and nitrogen removal for treating organic nitrogen wastewater, 1, a water inlet pipe, 2, an anaerobic zone, 3, an aerobic zone, 4, an anoxic zone, 5, a water outlet pipe 6, a flow guide pipe, 7, a gas guide pipe, 8, a first water collecting tank, 9, a second water collecting tank, 101, a first gas collecting hood, 102, a second gas collecting hood, 111, a first reflux descending pipe, 112, a second reflux descending pipe, 12, an aeration device, 13 and a one-way gallery.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to the attached figure 1, the invention provides a biological carbon removal and nitrogen removal integrated reactor 100 for treating organic nitrogen wastewater, which comprises five regions including an anaerobic zone 2, an aerobic zone 3, an anoxic zone 4, a first water collecting tank 8 and a second water collecting tank 9, wherein the anaerobic zone 2, the aerobic zone 3 and the anoxic zone 4 are respectively communicated through a one-way gallery 13, the one-way gallery 13 only allows wastewater to flow in one way along the arrow direction as the name suggests, one side of the anaerobic zone 2 is connected with a water inlet pipe 1, at least 1 first gas collecting hood 101 is arranged in the anaerobic zone 2, the other end of the first gas collecting hood 101 is communicated with the first water collecting tank 8, the bottom of the aerobic zone 3 is provided with an aeration device 12, the aeration device 12 is communicated with an external fan, the middle of the aerobic zone 3 is a reaction zone, the reaction zone is filled with biological suspended fillers, the top of the aerobic zone 3 is provided with a second gas collecting hood 102, the second gas-collecting hood 102 is respectively communicated with the first water-collecting tank 8 and the second water-collecting tank 9, and the first gas-collecting hood 101 and the second gas-collecting hood 102 have the same structure; the first water collecting tank 8 is provided with a first backflow downcomer 111, the first backflow downcomer 111 is communicated with the anaerobic zone 2, the second water collecting tank 9 is provided with a second backflow downcomer 112, the second backflow downcomer 112 is communicated with the aerobic zone 3, the first water collecting tank 8 and the second water collecting tank 9 are both provided with a gas guide pipe 7 and a flow guide pipe 6, one end of the gas guide pipe 7 is communicated with the corresponding first gas collecting hood 101 or second gas collecting hood 102 respectively, the other end of the gas guide pipe extends into the flow guide pipe 6 and is communicated with the flow guide pipe 6, one end of the flow guide pipe 6 is communicated with the two water collecting tanks, the other end of the flow guide pipe is communicated with the settling zone of the anoxic zone 4, the top of the anoxic zone 4 is provided with the settling zone, and the upper part of the settling zone is provided with a water outlet pipe 5.

Example one

The structure of the embodiment comprises an anaerobic zone 2, an aerobic zone 3, an anoxic zone 4 and an air-lift reflux device, wherein the anaerobic zone 2 is provided with a water inlet pipe 1, the anaerobic zone 2 and the aerobic zone 3 are respectively provided with a gas collecting hood, communicated to a first water collecting tank 8 at the top and provided with a reflux downcomer; the aerobic zone 3 is provided with an aeration device 12, the reaction zone of the aerobic zone 3 is filled with biological suspended filler, and the upper part of the aerobic zone 3 is provided with an air collecting hood for collecting aeration tail gas; a sedimentation zone is arranged at the top of the anoxic zone 4, and a water outlet pipe 5 is arranged at the upper part of the sedimentation zone; a water passing gallery 13 which flows in a single direction is arranged between the anaerobic zone 2 and the aerobic zone 3 and between the aerobic zone 3 and the anoxic zone 4.

When the anaerobic tank is used, high organic nitrogen wastewater is pumped into an anaerobic zone 2 of the integrated reactor device from a water inlet pipe 1 through a pump, organic nitrogen is degraded through anaerobic methanation under anaerobic conditions, high-concentration ammonia nitrogen is released, meanwhile, a first air-lift backflow system, namely a first gas collecting hood, collects gas (methane) in the anaerobic zone 2, generates backflow, and flows part of effluent of the anaerobic zone 2 back to a first water collecting tank 8, then flows to the bottom of the anaerobic zone 2 through a first backflow descending pipe 111, and the other part of anaerobic effluent overflows from the top and enters an aerobic zone 3 through a one-way gallery 13; air is input into the aerobic zone 3 from the aeration device 12 through a fan, and nitrite bacteria in the aerobic zone 3 convert ammonia nitrogen into nitrite nitrogen under the aerobic condition. Then, the wastewater containing part of ammonia nitrogen and nitrite nitrogen enters the anoxic zone 4 through the one-way gallery 13, and the ammonia nitrogen and nitrite are mainly converted into nitrogen and a small amount of nitrate under the action of anaerobic ammonia oxidizing bacteria; the second gas-lift backflow system is based on the gas-lift backflow principle, the aeration tail gas in the aerobic zone 3 is utilized to enable the effluent of the anaerobic zone to flow back to the first water collecting tank 8 or the second water collecting tank 9, the water in the first water collecting tank 8 enters the anaerobic zone to be subjected to denitrification, and the water in the second water collecting tank 9 enters the aerobic zone 3 to finally achieve autotrophic removal of nitrogen in the wastewater. Meanwhile, the reflux liquid can relieve acid and alkali generated by biochemical reactions in the anaerobic zone 2, the aerobic zone 3 and the anoxic zone 4 and maintain the pH of each zone to be stable; the ascending flow rate of the anaerobic zone 2 and the anoxic zone 4 can be increased, so that the sludge is in a suspended state, and granulation is facilitated.

In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. The utility model provides a handle organic nitrogen waste water's integrated reactor of biological decarbonization denitrogenation which characterized in that: comprises an anaerobic zone, an aerobic zone and an anoxic zone; a water inlet pipe is arranged on one side of the anaerobic zone, and a first air-lift backflow system is arranged in the anaerobic zone; the aerobic zone is provided with an aeration device, biological suspended fillers are filled above the aeration device, and a second air-lift backflow system is arranged at the upper part of the biological suspended fillers; a sedimentation zone is arranged at the top of the anoxic zone, and a water outlet pipe is arranged at the upper part of the sedimentation zone; and the anaerobic zone and the aerobic zone, and the aerobic zone and the anoxic zone are respectively provided with a one-way water passing gallery which flows in one way.

2. The integrated reactor for biological carbon and nitrogen removal for treating organic nitrogen wastewater as set forth in claim 1, wherein: the anaerobic zone is internally provided with at least one first air-lift backflow system, the first air-lift backflow system comprises a first air-collecting hood arranged in the anaerobic zone, the first air-collecting hood is communicated with a first air duct, and the tail end of the first air duct is connected with a first water collecting tank; the first water collecting tank is communicated with the bottom of the anaerobic zone through a first backflow descending pipe.

3. The integrated reactor for biological carbon and nitrogen removal for treating organic nitrogen wastewater as set forth in claim 2, wherein: the aerobic zone is internally provided with at least one second gas-lift backflow system, the second gas-lift backflow system comprises second gas collecting hoods distributed in the aerobic zone, the second gas collecting hoods are connected with second gas guide pipes, the tail ends of the second gas guide pipes are connected with flow guide pipes, and the connecting ends of the flow guide pipes and the second gas guide pipes are positioned in a first water collecting pool or a second water collecting pool; one end of the draft tube, which is far away from the second gas guide tube, is positioned in a sedimentation tank at the top of the anoxic zone; the second water collecting tank is connected with a second reflux descending pipe, and the tail end of the second reflux descending pipe is communicated with the aerobic zone.

4. The integrated reactor for biological carbon and nitrogen removal for treating organic nitrogen wastewater as set forth in claim 1, wherein: and a suspended filler for intercepting nitrosobacteria is arranged in the aerobic zone, and the suspended filler can partially or completely convert ammonia nitrogen in the effluent of the anaerobic zone into nitrous acid.

5. The integrated reactor for biological carbon and nitrogen removal for treating organic nitrogen wastewater as set forth in claim 3, wherein: the first air-lift backflow system and the second air-lift backflow system can respectively control backflow flow, the first air-lift backflow system can improve the ascending flow rate of the anaerobic zone, and the second air-lift backflow system can improve the ascending flow rate of the anaerobic zone and the anoxic zone.