JP2020044472A - Solution treatment system and solution treatment method - Google Patents

Abstract

To realize a solution treatment system and a solution treatment method with a small amount of aeration and a small number of tanks.SOLUTION: A solution is treated using a first reaction vessel that alternately changes an internal environment between a first anaerobic environment and a first aerobic environment. Denitrification treatment is performed in the first anaerobic environment and a nitrite treatment is performed in the first aerobic environment, by controlling activities of nitric acid bacteria and nitrite bacteria by a first activity regulating section.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solution processing system and a solution processing method.

  Ammonia contained in various solutions (eg, wastewater, sewage, and the like) causes environmental pollution, and thus it is necessary to remove the ammonia from the solution. As a technique for removing ammonia, for example, a technique for removing ammonia using a microorganism has been developed (for example, see Patent Documents 1 and 2).

  In the technique described in Patent Literature 1, nitrogen and phosphorus in wastewater are removed using a first aeration tank and a second aeration tank connected in series. At this time, the first aeration tank and the second aeration tank are controlled so that the aeration start time is the same, although the aeration time is different.

  In the technique described in Patent Literature 2, nitrogen and phosphorus in wastewater are removed using a first aeration tank and a second aeration tank connected in series. At this time, the environment inside each of the first aeration tank and the second aeration tank alternately changes between an aerobic state and an anaerobic state. The period when the aerobic state is formed in the first aeration tank and the period when the aerobic state is formed in the second aeration tank overlap, and the anaerobic state is formed in the first aeration tank. The period and the period when the anaerobic state is formed in the second aeration tank overlap.

Patent No. 2803941 Patent No. 3260575

  However, the conventional techniques as described above have a problem that the amount of aeration and the number of tanks required for processing the solution are large.

  An object of one embodiment of the present invention is to realize a solution processing system and a solution processing method in which the amount of aeration and the number of tanks are small.

  <1> In order to solve the above problems, a solution treatment system according to one embodiment of the present invention is configured such that a solution containing ammonia and an organic substance is supplied, and an internal environment is set to a first anaerobic environment. A first reaction tank for treating an internal solution while alternately changing to a first aerobic environment, wherein (i) the solution is charged under the first anaerobic environment; A first reaction tank for performing a denitrification treatment on the internal solution, and (ii) performing a nitrite treatment on the internal solution under the first aerobic environment. And a first activity control section for controlling the activities of nitric acid bacteria and nitrite bacteria contained in the solution in the first reaction tank.

  In the first reaction tank, the internal solution is processed while alternately changing the internal environment between a first anaerobic environment and a first aerobic environment. In addition, in the first reaction tank, in addition to the newly added solution, there is also a solution that is being processed.

  Under the first anaerobic environment, when a new solution is introduced into the first reaction tank, the denitrifying bacteria cause the organic matter contained in the new solution and the sub-solution contained in the solution in the process of being treated. A denitrification reaction occurs with nitric acid. As a result, in the solution in the first reaction tank, organic substances and nitrous acid are removed, and ammonia remains.

  Next, the environment inside the first reaction vessel changes from the first anaerobic environment to the first aerobic environment. Under the first aerobic environment, nitrites cause a nitrite reaction using ammonia remaining in the solution. Thereby, in the solution in the first reaction tank, ammonia is removed and nitrous acid is generated. Since the amount of oxygen required in the nitrite reaction is smaller than that in the nitrite reaction, ammonia can be removed with a small amount of oxygen. Further, the generated nitrous acid will be removed under the next first anaerobic environment formed after the first aerobic environment.

  In the first reaction tank, various bacteria such as nitrite and nitrate are present. The first activity regulator makes it possible to suppress the function of the nitric acid bacterium, in other words, to generate nitrous acid superior to nitric acid.

  As described above, in the first reaction tank, the amounts of ammonia and organic substances contained in the solution can be reduced by using a small amount of oxygen and a small number of tanks.

  <2> In the solution processing system according to one aspect of the present invention, at least a part of the solution in the first reaction tank is charged, and the internal environment is changed to a second aerobic environment and a second anaerobic environment. A second reaction tank for treating an internal solution while alternately changing the solution with a target environment, and (iii) in the first anaerobic environment under the second aerobic environment. At least a part of the solution in the first reaction tank is charged, the solution in the first reaction vessel is subjected to nitration, and (iv) the solution in the second anaerobic environment is added to the solution in the second anaerobic environment. It is preferable to further include a second reaction tank for performing a denitrification treatment.

  In the second reaction tank, the solution after the treatment in the first reaction tank (in other words, while the internal environment is alternately changed to the second aerobic environment and the second anaerobic environment) (in other words, , A solution containing a small amount of ammonia). In the second reaction tank, there is also a solution that is being processed in addition to the solution that is newly introduced and originates from the first reaction tank.

  In the second aerobic environment, when at least a part of the solution in the first reaction tank under the first anaerobic environment is supplied to the second reaction tank, nitrite and The nitric acid bacterium causes a nitration reaction using a small amount of ammonia remaining in the solution. Thereby, in the solution in the second reaction tank, a small amount of ammonia remaining in the solution is nitrated. The nitration reaction requires a larger amount of oxygen than the nitrite reaction. However, since a small amount of ammonia is treated in the second reaction tank, the ammonia can be removed with a small amount of oxygen. Therefore, compared to the conventional method, the total amount of oxygen required for removing ammonia in the first reaction tank and the second reaction tank can be reduced.

  Next, the internal environment of the second reaction vessel changes from the second aerobic environment to the second anaerobic environment. Under the second anaerobic environment, a denitrifying bacterium causes a denitrification reaction between the organic matter contained in the solution and the generated nitric acid. Thereby, nitric acid is removed from the solution in the second reaction tank.

  <3> In the solution processing system according to an aspect of the present invention, the time when the first anaerobic environment is formed in the first reaction tank and the time when the first anaerobic environment is formed in the second reaction tank. The period in which the aerobic environment 2 is formed is at least partially overlapped, and the period in which the first aerobic environment is formed in the first reaction tank, and the period in which the second aerobic environment is formed. It is preferable that at least a part of the period overlaps with the time when the second anaerobic environment is formed in the reaction tank.

  With the above configuration, it is not necessary to simultaneously form an aerobic environment in the first reaction tank and the second reaction tank. Therefore, using a simple configuration (eg, one aeration blower), a first aerobic environment, a first anaerobic environment, a second aerobic environment, and a second anaerobic environment are created. Can be formed.

  <4> In the solution processing system according to one embodiment of the present invention, a solution containing ammonia and an organic substance is supplied, and the internal environment is changed to a third anaerobic environment and a third aerobic environment. A third reaction vessel for treating the internal solution while changing the solution alternately; (i) in the third anaerobic environment, the solution is charged and the internal solution is removed; A third reaction tank for performing a nitriding treatment and (ii) performing a nitrite treatment on the internal solution in the third aerobic environment; A second activity regulator for regulating the activities of nitric acid bacteria and nitrite bacteria contained in the solution, and at least a part of the solution in the third reaction tank are charged, and the internal environment is reduced to the second. The solution inside is processed while alternately changing between the aerobic environment 4 and the anaerobic environment 4 4. The reaction tank of No. 4, wherein (iii) at least a part of the solution in the third reaction tank under the third anaerobic environment is charged under the fourth aerobic environment. And (iv) performing a nitrification treatment on the internal solution, and (iv) performing a denitrification treatment on the internal solution under the fourth anaerobic environment. And a period when the third anaerobic environment is formed in the third reaction tank, and a period when the fourth aerobic environment is formed in the fourth reaction tank. The time when the third aerobic environment is formed in the third reaction tank at least partially overlaps with the time when the fourth anaerobic environment is formed in the fourth reaction tank The period in which the first aerobic environment is formed is at least partially overlapped with the period in which the first aerobic environment is formed in the first reaction tank. The time when the fourth aerobic environment is formed in the fourth reaction vessel overlaps at least partially, and the second aerobic environment is formed in the second reaction vessel. It is preferable that at least a part of the formation time and the part of the time when the third aerobic environment is formed in the third reaction tank overlap.

  The solution processing system includes a processing system A including a first reaction tank, a first activity adjusting section, and a second reaction tank, a third reaction tank, a second activity adjusting section, And a processing system B having a fourth reaction tank. At this time, the first reaction tank and the third reaction tank have the same function, the first activity control unit and the second activity control unit have the same function, and the second reaction tank And the fourth reaction tank have the same function.

  According to the above configuration, the time when the first aerobic environment (in other words, the aerobic environment for nitrite treatment) is formed in the first reaction tank, The time when the fourth aerobic environment (in other words, the aerobic environment for the nitrification treatment) is formed in the reaction tank of No. 4 at least partially overlaps, and The time when the second aerobic environment (in other words, the aerobic environment for the nitrification treatment) is formed in the reaction tank, and the third aerobic environment in the third reaction tank. The period when the aerobic environment (in other words, the aerobic environment for the nitrite treatment) is formed at least partially overlaps.

  According to the above configuration, when aeration is performed on the first and fourth reaction vessels, aeration is not performed on the second and third reaction vessels. Further, according to the above configuration, when aeration is performed on the second reaction tank and the third reaction tank, aeration is not performed on the first reaction tank and the fourth reaction tank.

  The aeration amount for realizing an aerobic environment for nitrite treatment is A [L / hr], and the aeration amount for realizing an aerobic environment for nitrite treatment is B [L / hr]. ]. When aeration is performed on the first and fourth reaction vessels, a total of A + B [L / hr] is performed. Similarly, when aeration is performed on the second reaction tank and the third reaction tank, a total of A + B [L / hr] is performed. Since the time when the first reaction tank and the fourth reaction tank are aerated is different from the time when the second reaction tank and the third reaction tank are aerated, With a simple configuration (for example, one aeration blower having a substantially constant aeration amount), it is possible to control both the aeration for the processing system A and the aeration for the processing system B.

  <5> In the solution processing system according to one aspect of the present invention, the first activity adjusting unit may be configured to: (a) perform the first reaction based on a measurement result of the concentration of ammonia in the first reaction tank; (B) adjusting the amount of a solution containing ammonia and an organic substance to be charged into the first reaction tank, or (c) adjusting the amount of oxygen supplied to the tank. It is preferable to adjust the pH of the solution in the first reaction tank.

  If the concentration of ammonia in the first reaction tank becomes too low, the function of the nitric acid bacterium is activated in the first reaction tank, and nitric acid is generated more favorably than nitrite.

  By reducing the amount of oxygen supplied to the first reactor before the concentration of ammonia in the first reactor becomes too low, the environment in the first reactor is reduced to the first aerobic condition. If the environment is changed to the first anaerobic environment, the excess nitrite reaction can be stopped. Stopping the excess nitrite reaction makes it possible to cause a small amount of ammonia to be more stably present in the first reaction tank. As a result, the function of the nitric acid bacterium is suppressed in the first reaction tank, and nitrite can be generated more favorably than nitric acid.

  On the other hand, before the concentration of ammonia in the first reaction tank becomes too low, the first reaction tank is charged with a solution containing ammonia and an organic substance, whereby the first reaction is more stably performed. A small amount of ammonia can be present in the tank. As a result, the function of the nitric acid bacterium is suppressed in the first reaction tank, and nitrite can be generated more favorably than nitric acid.

On the other hand, before the concentration of ammonia in the first reaction tank becomes too low, the pH of the solution in the first reaction tank is adjusted to change ammonium ions (NH ₄ ⁺ ) into ammonia (NH ₃ ). By doing so, a small amount of ammonia can be present in the first reaction tank more stably. As a result, the function of the nitric acid bacterium is suppressed in the first reaction tank, and nitrite can be generated more favorably than nitric acid.

  <6> The solution processing system according to one aspect of the present invention preferably includes an organic substance supply unit that supplies an organic substance to the solution in the second reaction tank.

  Most of the organic substances contained in the solution charged into the first reaction tank are consumed in the denitrification treatment in the first reaction tank. In this case, the amount of organic substances that can be used for the denitrification reaction in the second reaction tank decreases. If an organic substance supply unit for supplying an organic substance to the solution in the second reaction tank is provided, it is possible to prevent a shortage of organic substances that can be used for the denitrification reaction in the second reaction tank, and as a result, the efficiency is improved. Solution processing can be performed well. Furthermore, the amount of ammonia treated in the second reactor is very small. Therefore, the amount of the organic substance supplied to the solution in the second reaction tank by the organic substance supply unit can be reduced.

  <7> It is preferable that the solution processing system according to one aspect of the present invention includes a first pH control unit that controls the pH of the solution in the first reaction tank.

When the pH changes, the state of ammonia changes (NH ₃ or NH ₄ ⁺ ). At this time, NH ₃ suppresses the action of nitric acid bacteria. According to the above configuration, the concentration of NH ₃ is increased in the first reaction vessel to make nitrous acid dominant, and / or the concentration of NH ₃ is decreased in the second reaction vessel to produce nitric acid. , The processing efficiency of the solution can be further increased.

  <8> In order to solve the above problem, in a solution treatment method according to one embodiment of the present invention, a solution containing ammonia and an organic substance is charged into a first reaction vessel, and the first A first reaction step of treating a solution inside the first reaction tank while alternately changing an environment inside the reaction tank to a first anaerobic environment and a first aerobic environment; (I) in the first anaerobic environment, the solution is charged into the first reaction vessel, and the solution inside the first reaction vessel is subjected to a denitrification treatment; and (Ii) a first reaction step of performing a nitrite treatment on a solution inside the first reaction tank in the first aerobic environment; The step is a first activity control for controlling the activities of nitrate bacteria and nitrite bacteria contained in the solution in the first reaction tank. It is characterized in that it comprises a degree.

  In the first reaction tank, the internal solution is processed while alternately changing the internal environment between a first anaerobic environment and a first aerobic environment. In addition, in the first reaction tank, in addition to the newly added solution, there is also a solution that is being processed.

  Under the first anaerobic environment, when a new solution is introduced into the first reaction tank, the denitrifying bacteria cause the organic matter contained in the new solution and the sub-solution contained in the solution in the process of being treated. A denitrification reaction occurs with nitric acid. As a result, in the solution in the first reaction tank, organic substances and nitrous acid are removed, and ammonia remains.

  Next, the environment inside the first reaction vessel changes from the first anaerobic environment to the first aerobic environment. Under the first aerobic environment, nitrites cause a nitrite reaction using ammonia remaining in the solution. Thereby, in the solution in the first reaction tank, ammonia is removed and nitrous acid is generated. Since the amount of oxygen required in the nitrite reaction is smaller than that in the nitrite reaction, ammonia can be removed with a small amount of oxygen. Further, the generated nitrous acid will be removed under the next first anaerobic environment formed after the first aerobic environment.

  In the first reaction tank, various bacteria such as nitrite and nitrate are present. The first activity regulation step makes it possible to suppress the function of the nitric acid bacterium, in other words, to generate nitrous acid superior to nitric acid.

  As described above, in the first reaction tank, the amounts of ammonia and organic substances contained in the solution can be reduced by using a small amount of oxygen and a small number of tanks.

  <9> In the solution processing method according to one aspect of the present invention, at least a part of the solution in the first reaction tank is charged into the second reaction tank, and the environment inside the second reaction tank is changed. A second aerobic environment and a second anaerobic environment alternately while treating the solution inside the second reaction tank, (iii) the second reaction step In the second aerobic environment, at least a part of the solution in the first reaction tank in the first anaerobic environment is charged into the second reaction tank, and the second reaction is performed. Performing a nitrification treatment on the solution inside the tank, and (iv) performing a denitrification treatment on the solution inside the second reaction tank under the second anaerobic environment. It is preferable that the method further includes the second reaction step.

  In the second reaction tank, the solution after the treatment in the first reaction tank (in other words, while the internal environment is alternately changed to the second aerobic environment and the second anaerobic environment) (in other words, , A solution containing a small amount of ammonia). In the second reaction tank, there is also a solution that is being processed in addition to the solution that is newly introduced and originates from the first reaction tank.

  In the second aerobic environment, when at least a part of the solution in the first reaction tank under the first anaerobic environment is supplied to the second reaction tank, nitrite and The nitric acid bacterium causes a nitration reaction using a small amount of ammonia remaining in the solution. Thereby, in the solution in the second reaction tank, a small amount of ammonia remaining in the solution is nitrated. The nitration reaction requires a larger amount of oxygen than the nitrite reaction. However, since a small amount of ammonia is treated in the second reaction tank, the ammonia can be removed with a small amount of oxygen. Therefore, as compared with the conventional method, the total amount of oxygen required for removing ammonia in the first reaction tank and the second reaction tank can be reduced.

  Next, the internal environment of the second reaction vessel changes from the second aerobic environment to the second anaerobic environment. Under the second anaerobic environment, a denitrifying bacterium causes a denitrification reaction between the organic matter contained in the solution and the generated nitric acid. Thereby, nitric acid is removed from the solution in the second reaction tank.

  <10> In the solution processing method according to one aspect of the present invention, the time when the first anaerobic environment is formed in the first reaction tank and the second time in the second reaction tank The period in which the aerobic environment 2 is formed is at least partially overlapped, and the period in which the first aerobic environment is formed in the first reaction tank, and the period in which the second aerobic environment is formed. It is preferable that at least a part of the period overlaps with the time when the second anaerobic environment is formed in the reaction tank.

  With the above configuration, it is not necessary to simultaneously form an aerobic environment in the first reaction tank and the second reaction tank. Therefore, using a simple configuration (eg, one aeration blower), a first aerobic environment, a first anaerobic environment, a second aerobic environment, and a second anaerobic environment are created. Can be formed.

  According to one embodiment of the present invention, a solution processing system and a solution processing method in which the amount of aeration and the number of tanks are small can be realized.

  According to one embodiment of the present invention, a solution processing system and a solution processing method capable of processing a solution at low power (for example, low power required by an aeration blower) and at low cost. Can be realized.

(A) and (B) are graphs schematically showing changes in the amount of a substance present in a solution processed by the solution processing system according to one embodiment of the present invention. It is a figure showing the outline of the composition of the solution processing system concerning one embodiment of the present invention. It is a figure showing the outline of the composition of the solution processing system concerning one embodiment of the present invention. It is a figure showing the outline of the composition of the solution processing system concerning one embodiment of the present invention. It is a figure showing the outline of the composition of the solution processing system concerning one embodiment of the present invention. (A)-(C) is a flowchart which shows the procedure of the solution processing method which concerns on one Embodiment of this invention.

  One embodiment of the present invention will be described below, but the present invention is not limited to this. The present invention is not limited to the configurations described below, and various modifications are possible within the scope of the claims, and the technical means disclosed in different embodiments may be appropriately combined. The embodiments obtained are also included in the technical scope of the present invention. In addition, all of the documents described in this specification are incorporated herein by reference. In the present specification, when the numerical range is described as “A to B”, the description intends “A to B”.

[1. Basic principle of the present invention)
The basic principle of the present invention will be described with reference to FIG.

The solution processing system according to one embodiment of the present invention includes a first reaction tank, and preferably further includes a second reaction tank. As shown below, a nitrite reaction and a denitrification reaction occur in the first reaction tank, and a nitrification reaction and a denitrification reaction occur in the second reaction tank. At this time, the nitrite reaction is mainly performed by the nitrite, and the nitrate reaction is mainly performed by the nitrite and the nitrite (more specifically, the production of NO ₂ from NH ₄ is performed by the nitrite). The production of NO ₃ from NO ₂ is carried out by nitric acid bacteria), and the denitrification reaction is carried out mainly by denitrifying bacteria.

  The inside of the first reaction vessel alternates between a first anaerobic environment and a first aerobic environment, and a new reaction vessel is added to the first reaction vessel under the first anaerobic environment. The solution is charged. In the configuration shown in FIG. 1, the inside of the first reaction tank becomes the first anaerobic environment at 0 to 15 minutes and 30 to 45 minutes, and the first anaerobic environment at 15 to 30 minutes and 45 to 60 minutes. The inside of the reaction tank becomes the first aerobic environment. Then, a new solution is charged into the first reaction tank in 5 to 10 minutes and 35 to 40 minutes.

The method for introducing a new solution into the first reaction tank is not particularly limited, and may be, for example, intermittent charging, continuous charging, or batch charging. The amount of a new solution charged into the first reaction tank per unit time may be the same or different. For example, in FIG. 1, the amount of solution to be introduced into the first reaction vessel 5 to 10 minutes and V _1, the amount of solution to be introduced into the first reaction vessel to 35-40 minutes and V ₂ . V ₁ and V ₂ may satisfy, for example, a relational expression of “V ₁ = V ₂ ”, “V ₁ > V ₂ ”, or “V ₁ <V ₂ ”.

  Under the first anaerobic environment, when a new solution is introduced into the first reaction tank, the denitrifying bacteria cause the organic matter contained in the new solution and the sub-solution contained in the solution in the process of being treated. A denitrification reaction occurs with nitric acid. Therefore, in the solution in the first reaction tank, the concentrations of organic substances and nitrous acid decrease. On the other hand, the concentration of ammonia in the solution in the first reaction tank increases due to the ammonia contained in the new solution. Since ammonia does not participate in the denitrification reaction, the concentration of ammonia does not change after it rises. As shown in FIG. 1, in the course of the denitrification reaction, BOD (Biochemical Oxygen Demand) decreases after increasing.

  Under the first aerobic environment, nitrites cause a nitrite reaction using ammonia remaining in the solution. Therefore, in the solution in the first reaction tank, the concentration of ammonia decreases and the concentration of nitrous acid increases. In addition, as shown in FIG. 1, BOD (Biochemical Oxygen Demand) does not change in the course of the nitritation reaction.

  In the first reaction tank, various bacteria such as nitrite and nitrate are present. The first activity regulator makes it possible to suppress the function of the nitric acid bacterium, in other words, to generate nitrous acid superior to nitric acid.

  The inside of the second reaction vessel alternates between a second aerobic environment and a second anaerobic environment, and under the second aerobic environment, At least a part of the solution in the first reaction tank under the first anaerobic environment is charged. In the configuration shown in FIG. 1, the inside of the second reaction tank becomes a second aerobic environment in 0 to 15 minutes and 30 to 45 minutes, and the second aerobic environment becomes in 15 to 30 minutes and 45 to 60 minutes. The inside of the reaction tank becomes the second anaerobic environment. Then, in 5 to 10 minutes and 35 to 40 minutes, at least a part of the solution in the first reaction tank under the first anaerobic environment is supplied to the second reaction tank. For example, when a new solution is introduced into the first reaction tank in 5 to 10 minutes and 35 to 40 minutes, the amount of the solution in the first reaction tank becomes excessive. The excess solution can then be charged to the second reactor at 5 to 10 minutes and at 35 to 40 minutes.

The method of introducing at least a part of the solution in the first reaction tank under the first anaerobic environment to the second reaction tank is not particularly limited, and may be, for example, intermittent charging, continuous charging, or It can be batch dosing. The amount of the solution in the first reaction tank charged into the second reaction tank per unit time may be the same or different. For example, in FIG. 1, the amount of solution to be introduced into the second reaction vessel to 5-10 minutes and V _3, the amount of solution to be introduced into the second reaction vessel to 35-40 minutes and V ₄ . V ₃ and V ₄ may satisfy, for example, a relational expression of “V ₃ = V ₄ ”, “V ₃ > V ₄ ”, or “V ₃ <V ₄ ”. At this time, V _{1 to} V ₄ may satisfy, for example, the relational expressions of “V ₁ = V ₃ ” and / or “V ₂ = V ₄ ”.

  In the second aerobic environment, when at least a part of the solution in the first reaction tank under the first anaerobic environment is introduced into the second reaction tank, the second reaction In the solution in the tank, the concentration of ammonia slightly increases. Thereafter, nitric acid causes a nitration reaction using a small amount of ammonia remaining in the solution. Therefore, in the solution in the second reaction tank, the concentration of ammonia decreases and the concentration of nitric acid increases. However, since the amount of ammonia treated in the second reaction tank is small, the BOD is negligibly small in the course of the nitrification reaction as shown in FIG.

  Under the second anaerobic environment, a denitrifying bacterium causes a denitrification reaction between the organic matter contained in the solution and the generated nitric acid. Thereby, in the solution in the second reaction tank, the concentration of nitric acid decreases. When the amount of organic matter contained in the solution is small, the organic matter (eg, methanol) may be charged into the second reaction tank in, for example, 20 minutes and / or 50 minutes. . Even if organic matter remains in the solution after the denitrification reaction, the remaining organic matter can be removed under the second aerobic environment.

  As described above, the solution processing system according to one embodiment of the present invention can process a solution even under conditions where the amount of aeration, the amount of organic matter added, and the number of tanks are small.

[2. Solution processing system)
[2-1. Embodiment 1]
As shown in FIG. 2, the solution processing system according to one embodiment of the present invention includes a first reaction tank 1. The first reaction tank 1 is charged with a solution containing ammonia and an organic substance, and alternately changes the internal environment between a first anaerobic environment and a first aerobic environment. (I) In a first anaerobic environment, the solution is introduced, and a denitrification process is performed on the internal solution, and (ii) the first solution is In an aerobic environment, a nitrite treatment is performed on the internal solution.

The first reaction tank 1 is charged with a solution 9a containing ammonia and organic substances. The solution 9a includes, for example, drainage and sewage. The capacity of the first reaction tank 1 is not particularly limited, and is, for example, 1 m ³ or more, 1 × 10 ³ m ³ or more, or 1 × 106 m ³ or more (more specifically, 1 m ³ to 1 × 10 ⁶ m). ^{3, 1m 3 ~1 × 10 3} m 3, 1m 3 ~100m 3, or ^may be a 1m ³ ~10m 3). More specifically, the capacity of the first reaction tank 1 may be 1 m ³ to 1 × 10 ³ m ³ when the solution to be treated is human waste, and the solution to be treated is sewage. In this case, the volume may be 1 m ³ to 1 × 10 ⁶ m ³ , and when the solution to be treated is a small amount of industrial wastewater, the volume may be smaller than these. Of course, the present invention is not limited to these.

  A pump 6a may be provided on the upstream side of the first reaction tank 1, and the amount and / or timing of the solution 9a to be charged into the first reaction tank 1 can be adjusted by the pump 6a. A valve 10a may be provided between the pump 6a and the first reaction tank 1, and the amount and / or timing of the solution 9a charged into the first reaction tank 1 may be adjusted by the valve 10a. That is, the solution 9a can be injected into the first reaction tank 1 under the first anaerobic environment using the pump 6a and / or the valve 10a.

  The solution processing system according to one embodiment of the present invention may include an aeration blower 8. Oxygen (for example, the atmosphere) is supplied from the aeration blower 8 to the blast holes 7a, and oxygen is supplied from the blast holes 7a to the solution 9a in the first reaction tank 1. By supplying oxygen from the blowing holes 7a to the solution 9a in the first reaction tank 1, the environment inside the first reaction tank 1 can be made a first aerobic environment. On the other hand, the environment inside the first reaction tank 1 can be made a first anaerobic environment by the activity of microorganisms (mainly nitrite) in the first reaction tank 1. By repeating the supply of oxygen and the activity of the microorganism, the environment inside the first reaction tank 1 can be alternately changed to the first anaerobic environment and the first aerobic environment. .

  The solution processing system according to one embodiment of the present invention may include a valve 10b between the aeration blower 8 and the blast hole 7a, and the solution 9a in the first reaction tank 1 may be provided by the aeration blower 8 and / or the valve 10b. The amount and / or timing of the oxygen supplied to the can be adjusted. Note that the amount of supplied oxygen may be adjusted using an inverter.

  The solution processing system according to one embodiment of the present invention includes a first activity control unit 5a that controls the activities of nitric acid bacteria and nitrite bacteria contained in the solution in the first reaction tank 1. . The activity of nitric acid and nitrite (in other words, the balance of the activity of nitric acid and nitrite) can be regulated, for example, by the concentration of ammonia in the solution, keeping the concentration of ammonia in the solution high. If so (for example, 10 mg / L to 300 mg / L, preferably 10 mg / L to 100 mg / L), the function of nitric acid bacteria can be suppressed.

  The first activity control unit 5a controls (a) the amount of oxygen supplied into the first reaction tank 1 based on the measurement result of the concentration of ammonia in the first reaction tank 1, (a) b) Adjusting the amount of the solution 9a containing ammonia and organic substances to be charged into the first reaction tank 1, or (c) adjusting the pH of the solution in the first reaction tank 1. Can be More specifically, the first activity controller 5a controls the operation of the (a ′) aeration blower 8 and / or the valve 10b based on the measurement result of the concentration of ammonia in the first reaction tank 1. , (B ′) that controls the operation of the pump 6a and / or the valve 10a, or (c ′) that controls the operation of a first pH adjustment unit 11a described later.

  The first activity adjusting section 5a may include a configuration for measuring the concentration of ammonia in the first reaction tank 1. Examples of such a configuration include a pH meter, a total nitrogen meter, an ammonia meter, a nitric acid meter, and a nitrite meter. As these, commercially available products can be used.

  The first activity control unit 5a has a desired configuration (for example, the aeration blower 8, the valve 10b, the pump 6a, and / or the valve 10a) based on the measurement result of the ammonia concentration in the first reaction tank 1. Can be provided. The configuration may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software. In the latter case, the first activity adjusting unit 5a includes a computer that executes instructions of a program that is software for realizing each function. This computer includes, for example, at least one processor (control device) and at least one computer-readable recording medium storing the program. Then, in the computer, the object of the present invention is achieved by the processor reading the program from the recording medium and executing the program. As the processor, for example, a CPU (Central Processing Unit) can be used. As the recording medium, a "temporary tangible medium" such as a ROM (Read Only Memory), a tape, a disk, a card, a semiconductor memory, and a programmable logic circuit can be used. Further, a RAM (Random Access Memory) for expanding the program may be further provided. Further, the program may be supplied to the computer via an arbitrary transmission medium (a communication network, a broadcast wave, or the like) capable of transmitting the program. Note that one embodiment of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

The solution processing system according to one embodiment of the present invention may include a first pH adjuster 11a that adjusts the pH of the solution in the first reaction tank 1. When the pH changes, the state of ammonia changes (NH ₃ or NH ₄ ⁺ ). At this time, the action of nitric acid bacteria can be suppressed by increasing the amount of NH ₃ . Although the specific configuration of the first pH adjustment unit 11a is not particularly limited, the first pH adjustment unit 11a accommodates, for example, each of an acidic solution and an alkaline solution for administration into the first reaction tank 1. It is preferable that the tank is provided with a tank which is closed. Further, the first pH adjuster 11a may include a pH meter for measuring the pH of the solution in the first reaction tank 1.

  As shown in FIG. 3, the solution processing system according to one embodiment of the present invention may include a precipitation tank 30 on the downstream side of the first reaction tank 1. The solution processing system according to one embodiment of the present invention may further include a flow rate adjustment tank 20 on the upstream side of the precipitation tank 30.

The sedimentation tank 30 is for sedimenting the activated sludge in the solution and removing the supernatant. According to this configuration, it is possible to prevent the activated sludge from flowing downstream of the settling tank 30. Capacity of the sedimentation tank 30 is not particularly limited, for ^{example, 1m 3 ~1 × 10 6 m} 3, 1m 3 ~1 × 10 3 m 3, 1m 3 ~100m 3, ^or a 1 m 3 through 10m ³ Is also good.

The flow rate adjusting tank 20 is for adjusting the flow rate of the solution flowing into the precipitation tank 30. According to this configuration, it is possible to prevent the activated sludge accumulated in the lower part of the settling tank 30 from being stirred. Capacity of the flow regulation tank 20 is not particularly limited, for ^{example, 1m 3 ~1 × 10 6 m} 3, 1m 3 ~1 × 10 3 m 3, 1m 3 ~100m 3, ^or, 1 m 3 through 10m ³ met You may. The flow rate adjusting tank 20 may include a valve for adjusting the flow rate of the solution flowing into the precipitation tank 30.

  The solution processing system according to one embodiment of the present invention uses a DO (Dissolved Oxygen) meter, an ORP (Oxidation Reduction Potential) meter, or an ammonia meter to measure the state of the solution in the first reaction tank 1. Can prepare. According to this configuration, the amount of aeration can be further reduced.

[2-2. Embodiment 2]
As shown in FIG. 4, the solution processing system according to one embodiment of the present invention includes a second reaction tank 2 in addition to a first reaction tank 1 and a first activity control unit 5a. . The second reaction tank 2 receives at least a part of the solution in the first reaction tank 1 and alternately changes the internal environment between a second aerobic environment and a second anaerobic environment. (Iii) at least a part of the solution in the first reaction tank 1 under the first anaerobic environment under the second aerobic environment. Is supplied, and a nitrification treatment is performed on the internal solution, and (iv) a denitrification treatment is performed on the internal solution under a second anaerobic environment. Hereinafter, [2-1. The description of the configuration described in the section of [Embodiment 1] is omitted.

At least a part of the solution in the first reaction tank 1 is charged into the second reaction tank 2. The second volume of the reaction vessel 2 is not particularly limited, for ^{example, 1m 3 ~1 × 10 6 m} 3, 1m 3 ~1 × 10 3 m 3, 1m 3 ~100m 3, ^or, 1 m 3 through 10m ³ It may be.

  A valve 10c may be provided on the upstream side of the second reaction tank 2, and the valve 10c controls the amount and / or timing of the solution in the first reaction tank 1 to be charged into the second reaction tank 2. be able to. That is, at least a part of the solution in the first reaction tank 1 under the first anaerobic environment is used for the second reaction tank 2 under the second aerobic environment using the valve 10c. Can be injected.

  The solution processing system according to one embodiment of the present invention may include an aeration blower 8. Oxygen (for example, the atmosphere) is supplied from the aeration blower 8 to the blast holes 7a and 7b, oxygen is supplied from the blast holes 7a to the solution 9a in the first reaction tank 1, and oxygen is supplied from the blast holes 7b. Oxygen is supplied to the solution in the second reaction tank 2. By supplying oxygen from the blowing holes 7a to the solution 9a in the first reaction tank 1, the environment inside the first reaction tank 1 can be made a first aerobic environment. In addition, by supplying oxygen from the fumarole 7b to the solution in the second reaction tank 2, the environment inside the second reaction tank 2 can be made a second aerobic environment.

  On the other hand, the environment inside the first reaction tank 1 can be made a first anaerobic environment by the activity of microorganisms (mainly nitrite) in the first reaction tank 1. In addition, the environment inside the second reaction tank 2 can be changed to a second anaerobic environment by the activity of microorganisms in the second reaction tank 2. Then, by repeating the supply of oxygen and the activity of the microorganism, the environment inside the first reaction tank 1 is alternately changed to a first anaerobic environment and a first aerobic environment, and The environment inside the second reaction tank 2 can be alternately changed to a second aerobic environment and a second anaerobic environment.

  The solution processing system according to one embodiment of the present invention may include a valve 10b between the aeration blower 8 and the blast hole 7a, and the solution 9a in the first reaction tank 1 may be provided by the aeration blower 8 and / or the valve 10b. The amount and / or timing of the oxygen supplied to the can be adjusted. Further, the solution processing system according to one embodiment of the present invention may include a valve 10d between the aeration blower 8 and the blow hole 7b, and the aeration blower 8 and / or the valve 10d may be used to provide a solution in the second reaction tank 2. The amount and / or timing of oxygen supplied to the solution can be adjusted. Therefore, the solution processing system according to the embodiment of the present invention includes the first aerobic environment, the first anaerobic environment, the second aerobic environment, and the second Can control when each of the anaerobic environments is formed. Note that the amount of supplied oxygen may be adjusted using an inverter.

  For example, if the valve 10d is closed when the valve 10b is open, and the valve 10d is opened when the valve 10b is closed, the time when the first anaerobic environment is formed in the first reaction tank 1 A and the time B during which the second aerobic environment is formed in the second reaction tank 2 at least partially overlap, and the first aerobic reaction is performed in the first reaction tank 1. It is possible to overlap, at least in part, the period C in which the target environment is formed and the period D in which the second anaerobic environment is formed in the second reaction tank 2.

  The ratio at which the timing A and the timing B overlap with each other is not particularly limited, but from the viewpoint of reducing the aeration amount, the larger the ratio at which the timing A overlaps, the more preferable. When the length of the timing A and the length of the timing B are substantially the same, the timings of the timings A and B are preferably 50% or more, more preferably 60% or more, more preferably 70% or more, and more preferably 80%. The above, more preferably 90% or more, and most preferably about 100% overlap each other. The ratio at which time C and time D overlap is not particularly limited, but from the viewpoint of reducing the amount of aeration, the larger the ratio of overlap, the more preferable. When the length of the time period C and the length of the time period D are substantially the same, preferably 50% or more, more preferably 60% or more, more preferably 70% or more, more preferably 80% of the time periods C and D. Above, more preferably 90%, most preferably about 100%, overlap each other.

  As described above, the solution processing system according to one embodiment of the present invention can be configured by one aeration blower 8, but may be configured by a plurality of aeration blowers. The solution processing system according to one embodiment of the present invention may be configured by, for example, an aeration blower connected to the blast port 7a and another aeration blower connected to the blast port 7b. When the above-mentioned time A and time B overlap at a large rate, it is not necessary to operate a plurality of aeration blowers simultaneously. With this configuration, the peak of the power consumption can be suppressed. Note that the amount of supplied oxygen may be adjusted using an inverter.

The solution processing system according to one embodiment of the present invention may include a second pH adjuster 11b that adjusts the pH of the solution in the second reaction tank 2. When the pH changes, the state of ammonia changes (NH ₃ or NH ₄ ⁺ ). At this time, the action of nitric acid bacteria can be activated by reducing NH ₃ . Although the specific configuration of the second pH adjusting unit 11b is not particularly limited, the second pH adjusting unit 11b accommodates, for example, each of an acidic solution and an alkaline solution for administration into the second reaction tank 2. It is preferable that the tank is provided with a tank which is closed. Further, the second pH adjuster 11b may include a pH meter for measuring the pH of the solution in the second reaction tank 2.

  The solution processing system according to one embodiment of the present invention may include a first organic substance supply unit 12a that supplies an organic substance to the solution in the second reaction tank 2. Although the specific configuration of the first organic substance supply unit 12a is not particularly limited, the first organic substance supply unit 12a contains, for example, an organic substance (for example, methanol) to be administered into the second reaction tank 2. It is preferable that the tank is provided with a tank. Further, the first organic substance supply unit 12a is provided with a GC-MS (Gass Chromatography Mass Spectrometry) or an LC-MS (Liquid Chromatography Mass Spectrometry) for measuring the concentration of the organic substance in the solution in the second reaction tank 2. ) May be provided. As these configurations, commercially available ones can be used.

  When the internal environment of the second reaction tank 2 is under the second anaerobic environment, a denitrification bacterium causes a denitrification reaction between the organic matter contained in the solution and the generated nitric acid. Thereby, nitric acid is removed from the solution in the second reaction tank 2. Even if an excessive amount of organic matter is supplied to the solution in the second reaction tank 2 by the first organic matter supply unit 12a and the organic matter remains after the denitrification reaction, the remaining organic matter is It is removed when the internal environment of the second reaction tank 2 is under a second aerobic environment. Therefore, the solution processing system according to one embodiment of the present invention does not require a re-aeration tank for removing remaining organic substances.

  The solution processing system according to one embodiment of the present invention may include a precipitation tank 30 on the downstream side of the second reaction tank 2. The solution processing system according to one embodiment of the present invention may further include a flow rate adjustment tank 20 on the upstream side of the precipitation tank 30. Since the specific configurations of the flow rate adjusting tank 20 and the sedimentation tank 30 have already been described, the description thereof is omitted here.

  The solution processing system according to one embodiment of the present invention uses a DO (Dissolved Oxygen) meter, an ORP (Oxidation Reduction Potential) meter, or an ammonia meter to measure the state of the solution in the second reaction tank 2. Can prepare. According to this configuration, the amount of aeration can be further reduced.

[2-3. Embodiment 3]
As shown in FIG. 5, the solution processing system according to the embodiment of the present invention includes a third reaction tank 1, a first activity control section 5 a, and a second reaction tank 2. The reactor includes a reaction tank 3, a second activity control section 5b, and a fourth reaction tank 4. In other words, the solution processing system according to one embodiment of the present invention includes a plurality of processing systems formed by the first reaction tank 1, the first activity control unit 5a, and the second reaction tank 2. (Eg, an even number such as two, four, six or eight).

  The third reaction tank 3 is charged with a solution containing ammonia and an organic substance, and alternately changes the internal environment between a third anaerobic environment and a third aerobic environment. (I) in a third anaerobic environment, the solution is charged, and the denitrification process is performed on the solution inside; and (ii) the third solution is In an aerobic environment, a nitrite treatment is performed on the internal solution.

  The second activity adjusting section 5b adjusts the activities of the nitric acid bacteria and the nitrite bacteria (in other words, the balance of the activities of the nitric acid bacteria and the nitrite bacteria) contained in the solution in the third reaction tank 3. Is what you do.

  The fourth reaction tank 4 receives at least a part of the solution in the third reaction tank 3 and alternately changes the internal environment between a fourth aerobic environment and a fourth anaerobic environment. (Iii) under a fourth aerobic environment, wherein at least a part of the solution in the third reaction tank under the third anaerobic environment is treated. At the same time, the nitric acid treatment is performed on the internal solution, and (iv) the denitrification process is performed on the internal solution under the fourth anaerobic environment.

  As shown in FIG. 5, the solution processing system according to one embodiment of the present invention further includes (i) pumps 6a and 6b, (ii) ventilation holes 7a, 7b, 7c, and 7d, (iii) aeration blower 8, (Iv) Valves 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, (v) First pH adjuster 11a, (vi) Second pH adjuster 11b, (vii) Third pH adjuster The unit 11c, (viii) a fourth pH adjusting unit 11d, (ix) a first organic substance supply unit 12a, and / or (x) a second organic substance supply unit 12b.

  The first reaction tank 1 and the third reaction tank 3 may have the same configuration, the second reaction tank 2 and the fourth reaction tank 4 may have the same configuration, and the first activity control unit 5a The second activity control section 5b may have the same configuration, the pump 6a and the pump 6b may have the same configuration, the blast holes 7a and 7c may have the same configuration, and the blast holes 7b and 7d. Can have the same configuration, the valves 10a and 10e can have the same configuration, the valves 10c and 10f can have the same configuration, the valves 10d and 10g can have the same configuration, and the valves 10b and 10b have the same configuration. The valve 10h may have the same configuration, the first pH adjustment unit 11a and the third pH adjustment unit 11c may have the same configuration, and the second pH adjustment unit 11b and the fourth pH adjustment unit 11d The first organic substance supply unit 12a and the second organic substance It may be the same configuration as the sheet portion 12b.

  For a specific example of the configuration described above, see [2-1. Embodiment 1] and [2-2. Since it has already been described in the section of [Embodiment 2], the description is omitted here.

  The solution processing system according to one embodiment of the present invention may further include an aeration blower 8. Oxygen (for example, the atmosphere) is supplied from the aeration blower 8 to the blast holes 7a, 7b, 7c, and 7d, and from the blast holes 7a to the solution 9a in the first reaction tank 1. Oxygen is supplied, oxygen is supplied to the solution in the second reaction tank 2 from the blow hole 7b, oxygen is supplied to the solution 9b in the third reaction tank 3 from the blow hole 7c, and Oxygen is supplied to the solution in the fourth reaction tank 4. By supplying oxygen from the blowing holes 7a to the solution 9a in the first reaction tank 1, the environment inside the first reaction tank 1 can be made a first aerobic environment. By supplying oxygen from the fumarole 7b to the solution in the second reaction tank 2, the environment inside the second reaction tank 2 can be made a second aerobic environment. By supplying oxygen from the blowing port 7c to the solution 9b in the third reaction tank 3, the environment inside the third reaction tank 3 can be made a third aerobic environment. Further, by supplying oxygen from the fumarole 7d to the solution in the fourth reaction tank 4, the environment inside the fourth reaction tank 4 can be made a fourth aerobic environment. Note that the amount of supplied oxygen may be adjusted using an inverter.

  On the other hand, the environment inside the first reaction tank 1 can be made a first anaerobic environment by the activity of microorganisms (mainly nitrite) in the first reaction tank 1. The environment inside the second reaction tank 2 can be changed to a second anaerobic environment by the activity of the microorganisms in the second reaction tank 2. The environment inside the third reaction tank 3 can be made into a third anaerobic environment by the activity of microorganisms (mainly nitrites) in the third reaction tank 3. The environment inside the fourth reaction tank 4 can be changed to a second anaerobic environment by the activity of the microorganisms in the fourth reaction tank 4. Then, by repeating the supply of oxygen and the activity of the microorganism, the environment inside the first reaction tank 1 is alternately changed to a first anaerobic environment and a first aerobic environment, and The environment inside the reaction tank 2 is alternately changed to a second aerobic environment and a second anaerobic environment, and the environment inside the third reaction tank 3 is changed to a third anaerobic environment and a third anaerobic environment. And the environment inside the fourth reaction tank 4 can be alternately changed to the fourth aerobic environment and the fourth anaerobic environment.

  Although the timing at which each environment is formed can be adjusted individually, the first aerobic environment and the third aerobic environment can be substantially the same environment, and the first aerobic environment and the first anaerobic environment can be adjusted. The third anaerobic environment may be substantially the same environment, the second aerobic environment and the fourth aerobic environment may be substantially the same environment, and the second anaerobic environment and the fourth anaerobic environment may be substantially the same environment. The anaerobic environment can be substantially the same environment.

  In the solution processing system according to the embodiment of the present invention, the time A ′ in which the third anaerobic environment is formed in the third reaction tank 3 and the fourth time in the fourth reaction tank 4 The period B ′ in which the aerobic environment is formed is at least partially overlapped, and the period C ′ in which the third aerobic environment is formed in the third reaction tank 3 and the fourth period B ′. At least partly overlaps with the period D ′ in which the fourth anaerobic environment is formed in the reaction tank 4, and the first aerobic environment is formed in the first reaction tank 1. The time C and the time B ′ in which the fourth aerobic environment is formed in the fourth reaction tank 4 at least partially overlap, and the second reaction tank 2 At least part of the period B in which the aerobic environment is formed and the period C ′ in which the third aerobic environment is formed in the third reaction tank 3 may be overlapped.

  For example, when the environment is formed, (i) the valve 10d is closed when the valve 10b is open, the valve 10d is opened when the valve 10b is closed, and (ii) the valve 10h is closed. Open the valve 10g, close the valve 10g when the valve 10h is open, (iii) open the valve 10g when the valve 10b is open, and (iv) open the valve 10h when the valve 10d is open. Can be done by

  The ratio at which the timing A 'and the timing B' overlap with each other is not particularly limited, but from the viewpoint of reducing the amount of aeration, the larger the overlapping ratio, the more preferable. When the length of the timing A ′ and the length of the timing B ′ are substantially the same, preferably, the timing A ′ and the timing B ′ are 50% or more, more preferably 60% or more, more preferably 70% or more, Preferably 80% or more, more preferably 90% or more, and most preferably about 100% overlap each other.

  The ratio at which the timing C 'and the timing D' overlap with each other is not particularly limited, but from the viewpoint of reducing the amount of aeration, it is preferable that the overlapping ratio is larger. When the length of the time period C ′ and the length of the time period D ′ are substantially the same, preferably 50% or more, more preferably 60% or more, more preferably 70% or more of the time periods C ′ and D ′. Preferably 80% or more, more preferably 90%, and most preferably about 100% overlap each other.

  The ratio at which the timing C and the timing B 'overlap with each other is not particularly limited, but from the viewpoint of reducing the amount of aeration, the larger the overlapping ratio is, the more preferable. When the length of the timing C and the length of the timing B ′ are substantially the same, the timing C and the timing B ′ are preferably 50% or more, more preferably 60% or more, more preferably 70% or more, more preferably 80% or more, more preferably 90% or more, and most preferably about 100% overlap each other.

  The ratio at which the timing B and the timing C 'overlap with each other is not particularly limited, but from the viewpoint of reducing the amount of aeration, it is preferable that the overlapping ratio is larger. When the length of the timing B and the length of the timing C ′ are substantially the same, the timing B and the timing C ′ are preferably at least 50%, more preferably at least 60%, more preferably at least 70%, more preferably 80% or more, more preferably 90% or more, and most preferably about 100% overlap each other.

  In the solution processing system according to one embodiment of the present invention, a solution 9a containing ammonia and an organic substance is supplied to the first reaction tank 1, and the third reaction tank 3 contains the ammonia and the organic substance. Solution 9b can be introduced. The solution 9a and the solution 9b include, for example, drainage and sewage. The solution 9a and the solution 9b may be the same solution containing the same components, or may be non-identical solutions containing different components.

[3. Solution treatment method)
As shown in FIG. 6A, in the solution processing method of the present embodiment, a solution containing ammonia and an organic substance is charged into a first reaction tank, and a solution inside the first reaction tank is charged. A first reaction step S1 for treating the solution inside the first reaction tank while alternately changing the environment between a first anaerobic environment and a first aerobic environment, and In a first anaerobic environment, the solution is charged into the first reaction tank, and the solution inside the first reaction tank is subjected to a denitrification treatment; and (ii) the first aerobic treatment is performed. May include a first reaction step S1 of performing a nitrite treatment on a solution inside the first reaction tank under a proper environment. Further, the first reaction step S1 may include a first activity adjusting step of adjusting the activities of nitric acid bacteria and nitrite bacteria contained in the solution in the first reaction tank.

  The first reaction step S1 is performed according to [2-1. [Embodiment 1]. More specifically, the first activity regulation step is described in [2-1. [Embodiment 1] can be performed by the first activity control section 5a or the like described in the section of [1st Embodiment]. Since these configurations have already been described, description thereof will be omitted here.

  The first reaction step S1 may be performed only once, but from the viewpoint of performing the solution treatment more efficiently, a plurality of times (for example, 5 or more, 10 or more, 50 or more, or 100 or more times) ) Is preferred.

  In the solution processing method according to the present embodiment, the first activity adjusting step includes: (a) supplying the ammonia into the first reaction tank based on the measurement result of the concentration of ammonia in the first reaction tank; (B) adjusting the amount of ammonia and organic matter-containing solution charged into the first reaction tank, or (c) adjusting the amount of oxygen supplied to the first reaction tank. Adjusting the pH of the solution therein.

  As shown in FIG. 6B, in the solution processing method of the present embodiment, before or after the first reaction step S1, at least a part of the solution in the first reaction tank is transferred to the second reaction tank. While being charged, the solution inside the second reaction vessel is processed while the environment inside the second reaction vessel is alternately changed to a second aerobic environment and a second anaerobic environment. (Iii) in a second aerobic environment, at least a part of the solution in the first reaction vessel under the first anaerobic environment is a second reaction vessel. And a nitrification treatment is performed on the solution inside the second reaction vessel, and (iv) under a second anaerobic environment, the solution inside the second reaction vessel is The method may further include a second reaction step S2 of performing a denitrification treatment by performing a denitrification treatment.

  The second reaction step S2 is performed as described in [2-2. [Second Embodiment]. Since these configurations have already been described, description thereof will be omitted here.

  The second reaction step S2 can be performed the same number of times as the first reaction step S1. The second reaction step S2 may be performed only once, but from the viewpoint of performing the solution treatment more efficiently, a plurality of times (for example, 5 or more, 10 or more, 50 or more, or 100 or more times) ) Is preferred.

  [2-2. As described in the section of [Embodiment 2], in the solution processing method of the present embodiment, the time when the first anaerobic environment is formed in the first reaction tank and the time when the second reaction The time when the second aerobic environment is formed in the tank is at least partially overlapped, and the time when the first aerobic environment is formed in the first reaction tank, The time when the second anaerobic environment is formed in the second reaction tank may be at least partially overlapped.

  In the solution processing method of the present embodiment, the second reaction step S2 may include a first organic substance supply step of supplying an organic substance to the solution in the second reaction tank. The first organic substance supply step is as described in [2-2. Embodiment 2] can be performed by the first organic material supply unit 12a described in the section of [2nd Embodiment].

  In the solution processing method of the present embodiment, the first reaction step S1 includes a first pH adjustment step of adjusting the pH of the solution in the first reaction tank, and / or the second reaction step S2 may include a second pH adjusting step of adjusting the pH of the solution in the second reaction vessel. The first pH adjustment step and the second pH adjustment step are described in [2-1. Embodiment 1] and [2-2. It can be performed by the first pH adjuster 11a and the second pH adjuster 11b described in the section of [Embodiment 2].

  As shown in FIG. 6C, in the solution processing method of the present embodiment, in addition to the first reaction step S1 and the second reaction step S2, the third reaction tank contains ammonia and an organic substance. While the solution in the third reaction vessel is alternately changed to a third anaerobic environment and a third aerobic environment while the solution is supplied. A third reaction step S3 for treating the solution of (a), wherein (i) the solution is charged into the third reaction vessel under the third anaerobic environment and the third reaction vessel Performing a denitrification treatment on the solution inside the, and (ii) performing a nitrite treatment on the solution inside the third reaction tank under the third aerobic environment. In the third reaction step S3, at least a part of the solution in the third reaction tank is charged into the fourth reaction tank. Processing the solution inside the fourth reaction vessel while alternately changing the environment inside the fourth reaction vessel to a fourth aerobic environment and a fourth anaerobic environment. In the reaction step S4, (iii) in the fourth aerobic environment, at least a part of the solution in the third reaction tank under the third anaerobic environment is used for the fourth reaction. Being charged into the tank, the solution inside the fourth reaction tank is subjected to a nitrification treatment, and (iv) the inside of the fourth reaction tank is placed under the fourth anaerobic environment. And a fourth reaction step S4 of performing a denitrification treatment on the solution of the above.

  The third reaction step S3 includes a second activity adjustment step of adjusting the activities of nitric acid bacteria and nitrite bacteria contained in the solution in the third reaction tank, and the third reaction step S3 includes: At least a part of the time when the third anaerobic environment is formed in the tank and the time when the fourth aerobic environment is formed in the fourth reaction tank overlap with each other. The time when the third aerobic environment is formed in the third reaction tank and the time when the fourth anaerobic environment is formed in the fourth reaction tank. The time when the first aerobic environment is formed in the first reaction vessel at least partially overlaps with the time when the fourth aerobic environment is formed in the fourth reaction vessel. The period in which the second aerobic environment is formed in the second reaction tank at least partially overlaps with the period in which the second aerobic environment is formed. The third is the time when the third aerobic environment is formed in the reaction vessel, at least partially may overlap.

  The third reaction step S3 is performed as described in [2-3. [Third Embodiment]. More specifically, the second activity regulation step is described in [2-3. [Third Embodiment] can be performed by the second activity regulator 5b described in the section of [3rd Embodiment]. Since these configurations have already been described, description thereof will be omitted here.

  The third reaction step S3 may be performed only once, but from the viewpoint of performing the solution treatment more efficiently, a plurality of times (for example, 5 or more, 10 or more, 50 or more, or 100 or more times) ) Is preferred.

  The fourth reaction step S4 is performed as described in [2-3. [Third Embodiment]. Since these configurations have already been described, description thereof will be omitted here.

  The fourth reaction step S4 can be performed the same number of times as the third reaction step S3. Each of the first reaction step S1, the second reaction step S2, the third reaction step S3, and the fourth reaction step S4 may be performed the same number of times. The fourth reaction step S4 may be performed only once, but from the viewpoint of performing the solution treatment more efficiently, a plurality of times (for example, 5 or more, 10 or more, 50 or more, or 100 or more times) ) Is preferred.

  In the solution processing method according to the present embodiment, the second activity adjusting step includes: (a) supplying the ammonia into the third reaction tank based on the measurement result of the ammonia concentration in the third reaction tank; (B) adjusting the amount of a solution containing ammonia and an organic substance, which is charged into the third reaction tank, or (c) adjusting the amount of oxygen supplied to the third reaction tank. Adjusting the pH of the solution therein.

  In the solution processing method of the present embodiment, the fourth reaction step S4 may include a second organic substance supply step of supplying an organic substance to the solution in the fourth reaction tank. The second organic substance supply step is as described in [2-3. This can be performed by the second organic material supply unit 12b described in the section of [Third Embodiment].

  In the solution processing method of the present embodiment, the third reaction step S3 includes a third pH adjustment step of adjusting the pH of the solution in the third reaction tank, and / or the fourth reaction step S4 may include a fourth pH adjusting step of adjusting the pH of the solution in the fourth reaction vessel. The third pH adjustment step and the fourth pH adjustment step are described in [2-3. This can be performed by the third pH adjusting unit 11c and the fourth pH adjusting unit 11d described in the section of [Third Embodiment].

  In FIG. 6C, the start time of the first reaction step S1 and the start time of the third reaction step S3 are the same. However, in the solution processing method of the present embodiment, the start time of the first reaction step S1 and the start time of the third reaction step S3 may be the same, or the start time of the first reaction step S1 may be the same. The timing and the start timing of the third reaction step S3 may be different.

  In FIG. 6C, the end time of the second reaction step S2 is the same as the end time of the fourth reaction step S4. However, in the solution processing method of the present embodiment, the end time of the second reaction step S2 may be the same as the end time of the fourth reaction step S4, or the end time of the second reaction step S2 may be the same. The timing and the end timing of the fourth reaction step S4 may be different.

  The present invention can be used for treating solutions (eg, wastewater and sewage).

DESCRIPTION OF SYMBOLS 1 1st reaction tank 2 2nd reaction tank 3 3rd reaction tank 4 4th reaction tank 5a 1st activity control part 5b 2nd activity control part 6a, 6b Pump 7a, 7b, 7c, 7d Fume Hole 8 Aeration blower 9a, 9b Solution 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h Valve 11a First pH adjuster 11b Second pH adjuster 11c Third pH adjuster 11d Fourth pH Control part 12a First organic substance supply part 12b Second organic substance supply part 20 Flow rate regulation tank 30 Precipitation tank S1 First reaction step S2 Second reaction step S3 Third reaction step S4 Fourth reaction step

Claims (10)

A first process for treating the internal solution while supplying a solution containing ammonia and organic matter while alternately changing the internal environment to a first anaerobic environment and a first aerobic environment. A reaction tank, wherein (i) the solution is charged in the first anaerobic environment, a denitrification treatment is performed on an internal solution, and (ii) the first solution is used. A first reaction tank for performing a nitrite treatment on the internal solution under a pneumatic environment;
A first activity control unit for controlling the activities of nitric acid bacteria and nitrite bacteria contained in the solution in the first reaction tank.   At least a part of the solution in the first reaction tank is charged, and the internal solution is processed while alternately changing the internal environment to a second aerobic environment and a second anaerobic environment. (Iii) in the second aerobic environment, at least a part of the solution in the first reaction tank in the first anaerobic environment is charged. A second reaction tank for performing a nitrification treatment on the internal solution, and (iv) performing a denitrification treatment on the internal solution under the second anaerobic environment. The solution processing system according to claim 1, further comprising: The time when the first anaerobic environment is formed in the first reaction tank and the time when the second aerobic environment is formed in the second reaction tank are as follows: At least partially overlap,
The time when the first aerobic environment is formed in the first reaction tank and the time when the second anaerobic environment is formed in the second reaction tank are as follows: The solution processing system according to claim 2, wherein at least a part of the solution processing system overlaps. A third process for treating the internal solution while alternately changing the internal environment to a third anaerobic environment and a third aerobic environment while introducing a solution containing ammonia and organic substances. A reaction tank, wherein (i) the solution is charged under the third anaerobic environment, a denitrification treatment is performed on an internal solution, and (ii) the third solution is used. A third reaction vessel for performing a nitrite treatment on the internal solution under a pneumatic environment;
A second activity regulator for regulating the activities of nitric acid bacteria and nitrite bacteria contained in the solution in the third reaction vessel;
At least a part of the solution in the third reaction tank is charged, and the internal solution is processed while alternately changing the internal environment to a fourth aerobic environment and a fourth anaerobic environment. (Iii) in the fourth aerobic environment, at least a part of the solution in the third reaction tank under the third anaerobic environment is charged. And a nitrification treatment on the internal solution, and (iv) a denitrification treatment on the internal solution in the fourth anaerobic environment, Further comprising
The time when the third anaerobic environment is formed in the third reaction tank and the time when the fourth aerobic environment is formed in the fourth reaction tank are as follows: At least a part thereof overlaps, the time when the third aerobic environment is formed in the third reaction tank, and the fourth anaerobic environment is formed in the fourth reaction tank. At least partially overlap,
The time when the first aerobic environment is formed in the first reaction tank and the time when the fourth aerobic environment is formed in the fourth reaction tank The time when at least a part thereof overlaps and the second aerobic environment is formed in the second reaction tank, and the time when the third aerobic environment is formed in the third reaction tank. The solution processing system according to claim 3, wherein the formed time is at least partially overlapped.   The first activity control section controls (a) the amount of oxygen supplied into the first reaction tank based on the measurement result of the concentration of ammonia in the first reaction tank; ( b) adjusting the amount of the solution containing ammonia and organic substances to be charged into the first reaction tank, or (c) adjusting the pH of the solution in the first reaction tank; The solution processing system according to claim 1, wherein:   The solution processing system according to claim 2, further comprising an organic substance supply unit that supplies an organic substance to the solution in the second reaction tank.   The solution processing system according to any one of claims 1 to 6, further comprising a first pH adjuster for adjusting the pH of the solution in the first reaction tank. A solution containing ammonia and an organic substance is charged into the first reaction tank, and the environment inside the first reaction tank is alternately changed into a first anaerobic environment and a first aerobic environment. A first reaction step of treating the solution inside the first reaction vessel while changing the solution to (i) under the first anaerobic environment, wherein the solution is treated in the first reaction vessel. And a denitrification treatment is performed on the solution inside the first reaction tank, and (ii) inside the first reaction tank under the first aerobic environment. Having a first reaction step of performing nitrite treatment on the solution of
Wherein the first reaction step includes a first activity adjusting step of adjusting the activities of nitric acid bacteria and nitrite bacteria contained in the solution in the first reaction tank. Processing method.   At least a part of the solution in the first reaction tank is charged into the second reaction tank, and the environment inside the second reaction tank is changed to a second aerobic environment and a second anaerobic environment. A second reaction step of treating the solution inside the second reaction vessel while alternately changing the first and second anaerobic conditions in the second aerobic environment under the second aerobic environment. At least a portion of the solution in the first reaction vessel under a static environment is charged into the second reaction vessel, and the solution inside the second reaction vessel is subjected to nitration treatment; and (Iv) further comprising a second reaction step of performing a denitrification treatment on the solution inside the second reaction tank under the second anaerobic environment. Item 10. The solution processing method according to Item 8. The time when the first anaerobic environment is formed in the first reaction tank and the time when the second aerobic environment is formed in the second reaction tank are as follows: At least partially overlap,
The time when the first aerobic environment is formed in the first reaction tank and the time when the second anaerobic environment is formed in the second reaction tank are as follows: The solution processing method according to claim 9, wherein at least a part thereof overlaps.

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