Solution processing apparatus and solution processing method

Abstract

To provide a solution treatment apparatus and a solution treatment method capable of accelerating the decomposition of organic matter contained in a solution to be treated by the oxidation treatment of the solution and capable of suppressing the excessive decomposition of solid matter contained in the solution.SOLUTION: In the oxidation treatment of a solution (10) to be treated, the amount of oxygen (15) to be supplied to the solution (10) to be treated is adjusted based on the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas in an oxidation treatment tank (3).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a solution processing apparatus and a solution processing method. [Background technology]

[0002] Components (e.g., organic matter, solid matter) contained in various solutions (e.g., human waste, septic tank sludge, sewage sludge, agricultural village wastewater sludge, industrial wastewater, food waste, agricultural residues, livestock manure) cause environmental pollution, and therefore, these components must be removed from the solutions. As a technique for removing these components, for example, a technique using microorganisms has been developed (see Patent Document 1).

[0003] Patent Document 1 discloses an apparatus for treating human wastewater, which includes a pretreatment means for introducing human wastewater and removing impurities therefrom, a pre-reaction means for oxidizing the human wastewater treated by the pretreatment means, a reaction means for nitrifying and denitrifying the human wastewater treated by the pre-reaction means, and a solid-liquid separation means for separating the suspension sent from the reaction means into solid and liquid.

[0004] The treatment device described in Patent Document 1 includes a reaction means between the pre-reaction means and the solid-liquid separation means, which uses microorganisms to nitrify and denitrify the night soil wastewater that has been oxidized (aerobic treated) in the pre-reaction means. In the solid-liquid separation means, the night soil wastewater that has been nitrified and denitrified by microorganisms in the reaction means is further subjected to solid-liquid separation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-33589 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, the technology described in Patent Document 1 is a technology that essentially includes a reaction means for nitrifying and denitrifying sewage wastewater using microorganisms. The present inventor, from a unique perspective, attempted to develop a technology that does not use the reaction means. Specifically, the present inventor attempted to subject oxidized wastewater to solid-liquid separation treatment without nitrifying and denitrifying it. The present inventor faced a unique problem: solids necessary for the subsequent solid-liquid separation treatment were lost in the previous oxidation treatment, which could result in problems with the subsequent solid-liquid separation treatment.

[0007] One aspect of the present invention aims to provide a solution treatment apparatus and a solution treatment method that can promote decomposition of organic matter contained in a solution to be treated during oxidation treatment of the solution, and can suppress excessive decomposition of solid matter contained in the solution. [Means for solving the problem]

[0008] In order to solve the above problems, the present inventors discovered that adjusting the amount of oxygen supplied to a solution to be treated based on the concentrations of hydrogen sulfide and / or oxygen and the ammonia contained in the gas in an oxidation treatment tank in which the solution to be treated is oxidized not only promotes decomposition of organic matter contained in the solution but also suppresses excessive decomposition of solids contained in the solution, thereby enabling good solid-liquid separation of the solution after oxidation treatment, and thus completed the present invention. One aspect of the present invention includes the following.

[0009] <1> A solution treatment apparatus comprising: an oxygen supply unit that supplies oxygen to a solution to be treated; an oxidation treatment tank that stores the solution to which the oxygen has been supplied and oxidizes the solution to obtain a treatment liquid; and a concentration measurement unit that measures the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas in the oxidation treatment tank, wherein the oxygen supply unit adjusts the amount of oxygen to be supplied to the solution based on the concentration of the hydrogen sulfide and / or oxygen and the concentration of the ammonia.

[0010] The solution to be treated contains organic matter (organic matter that is soluble in the solution) and solid matter. When the solution is subjected to oxidation treatment using oxygen, both the organic matter and the solid matter contained in the solution are decomposed.

[0011] At this time, the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas in the oxidation treatment tank function as parameters indicating the status of the oxidation treatment.

[0012] The oxygen supply unit adjusts the amount of oxygen supplied to the solution based on the concentration of the hydrogen sulfide and / or oxygen and the concentration of the ammonia, thereby not only promoting the decomposition of the organic matter but also suppressing excessive decomposition of the solid matter.

[0013] If the treatment liquid contains an appropriate amount of the above solid matter, solid-liquid separation can be carried out satisfactorily, and as a result, the quality of the dehydrated filtrate after solid-liquid separation can be improved.

[0014] <2> The oxygen supply unit (i) determines the amount of oxygen to be supplied to the solution based on the concentration of the hydrogen sulfide and / or oxygen, and (ii) reduces the amount of oxygen to be supplied to the solution based on the concentration of the ammonia. <1> The solution treatment device according to claim 1.

[0015] The concentrations of hydrogen sulfide and / or oxygen contained in the gas in the oxidation treatment tank function better as parameters indicating the minimum amount of oxygen required for oxidation treatment. For example, a decrease in the concentration of hydrogen sulfide contained in the gas in the oxidation treatment tank or an increase in the concentration of oxygen contained in the gas in the oxidation treatment tank indicates that the minimum amount of oxygen required for oxidation treatment is being supplied to the solution.

[0016] On the other hand, the concentration of ammonia contained in the gas in the oxidation treatment tank functions better as a parameter indicating the degree of progress of the oxidation treatment, for example, an increase in the concentration of ammonia contained in the gas in the oxidation treatment tank indicates that the oxidation treatment is progressing.

[0017] In the oxygen supply unit, (i) the amount of oxygen to be supplied to the solution is determined based on the concentration of the hydrogen sulfide and / or oxygen, and (ii) the amount of oxygen to be supplied to the solution is reduced based on the concentration of the ammonia, thereby not only better promoting the decomposition of organic matter contained in the solution but also better suppressing excessive decomposition of solid matter contained in the solution.

[0018] If the treatment liquid contains a more appropriate amount of the solid matter, solid-liquid separation can be performed more effectively, and as a result, the quality of the dehydrated filtrate after solid-liquid separation can be improved.

[0019] <3> A solid-liquid separation unit is provided for separating the treatment liquid into solid and liquid. <1> or <2> The solution treatment device according to claim 1.

[0020] In the treatment liquid, not only is the decomposition of the organic matter promoted, but excessive decomposition of the solid matter is suppressed. The solid matter contained in the treatment liquid has dehydration properties, enabling efficient solid-liquid separation.

[0021] Since the treated liquid contains an appropriate amount of solid matter, the treated liquid can be subjected to good solid-liquid separation, and as a result, the quality of the dehydrated filtrate after solid-liquid separation can be improved.

[0022] <4> a temperature measuring unit that measures the temperature of the solution contained in the oxidation treatment tank, and the oxygen supply unit adjusts the amount of oxygen to be supplied to the solution based on the temperature. <1> ~ <3> 10. The solution treatment device according to claim 9, wherein the solution treatment device is a solution treatment apparatus.

[0023] The temperature of the liquid contained in the oxidation treatment tank has a significant effect on the decomposition of organic matter contained in the solution.

[0024] For example, if the temperature of the liquid is high, the decomposition of organic matter can be accelerated. This indicates that when the temperature of the liquid is high, the organic matter can be sufficiently decomposed even if the amount of oxygen supplied to the solution to be treated is reduced.

[0025] Furthermore, if the temperature of the liquid is high, the solubility of hydrogen sulfide, oxygen, and ammonia in the liquid decreases, resulting in higher gas concentrations of hydrogen sulfide, oxygen, and ammonia. Therefore, by measuring the temperature of the solution, changing the hydrogen sulfide and / or oxygen concentrations and the ammonia concentrations, which serve as indicators, based on the temperature, and adjusting the amount of oxygen supplied based on the hydrogen sulfide and / or oxygen concentrations and the ammonia concentrations, it is possible to create conditions suitable for decomposing the organic matter and solid matter contained in the solution.

[0026] On the other hand, if the temperature of the liquid is low, the decomposition of organic matter may be suppressed. This indicates that when the temperature of the liquid is low, it is preferable to increase the amount of oxygen supplied to the solution to be treated in order to sufficiently decompose the organic matter.

[0027] Furthermore, if the temperature of the liquid is low, the solubility of hydrogen sulfide, oxygen, and ammonia in the liquid increases, resulting in a lower gas concentration of hydrogen sulfide, oxygen, and ammonia. Therefore, by measuring the temperature of the solution, changing the hydrogen sulfide and / or oxygen concentration and the ammonia concentration, which serve as indicators, based on the temperature, and adjusting the amount of oxygen supplied based on the hydrogen sulfide and / or oxygen concentration and the ammonia concentration, it is possible to create conditions suitable for decomposing the organic matter and solid matter contained in the solution.

[0028] By adjusting the amount of oxygen supplied to the solution based on the temperature of the liquid contained in the oxidation treatment tank, the amount of organic matter contained in the treatment liquid can be reduced more effectively.

[0029] <5> When a new solution to be treated is placed in the oxidation treatment tank, the oxygen supply unit resets the amount of oxygen to be supplied to the solution to an initial value. <1> ~ <4> 10. The solution treatment device according to claim 9, wherein the solution treatment device is a solution treatment apparatus.

[0030] When a new solution to be treated is placed in the oxidation treatment tank, the concentration of hydrogen sulfide contained in the gas in the oxidation treatment tank changes significantly (increases), the concentration of oxygen also changes significantly (decreases), and the concentration of ammonia also changes (decreases), which makes it difficult to adjust the amount of oxygen supplied to the solution.

[0031] When a new solution to be treated is placed in the oxidation treatment tank, the amount of oxygen to be supplied to the solution can be reset to an initial value, thereby simplifying the adjustment of the amount of oxygen to be supplied to the solution.

[0032] <6> The solution to be treated is human waste, septic tank sludge, sewage sludge, agricultural village wastewater sludge, industrial wastewater, food waste, agricultural residue, or livestock manure. <1> ~ <5> 10. The solution treatment device according to claim 9, wherein the solution treatment device is a solution treatment apparatus.

[0033] The solution is rich in organic matter and solids, and therefore can be better processed.

[0034] <7> A solution treatment method comprising: an oxygen supply step of supplying oxygen to a solution to be treated; an oxidation treatment step of storing the oxygen-supplied solution in an oxidation treatment tank and oxidizing the solution to obtain a treatment liquid; and a concentration measurement step of measuring the concentrations of hydrogen sulfide and / or oxygen and ammonia contained in gas within the oxidation treatment tank, wherein in the oxygen supply step, the amount of oxygen supplied to the solution is adjusted based on the concentrations of hydrogen sulfide and / or oxygen and the ammonia.

[0035] The solution to be treated contains organic matter (organic matter that is soluble in the solution) and solid matter. When the solution is subjected to oxidation treatment using oxygen, both the organic matter and the solid matter contained in the solution are decomposed.

[0036] At this time, the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas in the oxidation treatment tank function as parameters indicating the status of the oxidation treatment.

[0037] In the oxygen supply step, the amount of oxygen supplied to the solution is adjusted based on the concentration of the hydrogen sulfide and / or oxygen and the concentration of the ammonia, which not only promotes the decomposition of the organic matter but also suppresses excessive decomposition of the solid matter.

[0038] If the treatment liquid contains an appropriate amount of the above solid matter, solid-liquid separation can be carried out satisfactorily, and as a result, the quality of the dehydrated filtrate after solid-liquid separation can be improved.

[0039] <8> In the oxygen supplying step, (i) an amount of oxygen to be supplied to the solution is determined based on the concentration of the hydrogen sulfide and / or oxygen, and (ii) an amount of oxygen to be supplied to the solution is reduced based on the concentration of the ammonia. <7> The solution processing method according to claim 1.

[0040] The concentrations of hydrogen sulfide and / or oxygen contained in the gas in the oxidation treatment tank function better as parameters indicating the minimum amount of oxygen required for oxidation treatment. For example, a decrease in the concentration of hydrogen sulfide contained in the gas in the oxidation treatment tank or an increase in the concentration of oxygen contained in the gas in the oxidation treatment tank indicates that the minimum amount of oxygen required for oxidation treatment is being supplied to the solution.

[0041] On the other hand, the concentration of ammonia contained in the gas in the oxidation treatment tank functions better as a parameter indicating the degree of progress of the oxidation treatment, for example, an increase in the concentration of ammonia contained in the gas in the oxidation treatment tank indicates that the oxidation treatment is progressing.

[0042] In the oxygen supply step, (i) determining the amount of oxygen to be supplied to the solution based on the concentration of hydrogen sulfide and / or oxygen, and (ii) reducing the amount of oxygen to be supplied to the solution based on the concentration of ammonia, not only can the decomposition of organic matter contained in the solution be more effectively promoted, but also excessive decomposition of solid matter contained in the solution can be more effectively suppressed.

[0043] If the treatment liquid contains a more appropriate amount of the solid matter, solid-liquid separation can be performed more effectively, and as a result, the quality of the dehydrated filtrate after solid-liquid separation can be improved.

[0044] <9> A solid-liquid separation step of separating the treated liquid into solid and liquid. <7> or <8> The solution processing method according to claim 1.

[0045] In the treatment liquid, not only is the decomposition of the organic matter promoted, but excessive decomposition of the solid matter is suppressed. The solid matter contained in the treatment liquid has dehydration properties, enabling efficient solid-liquid separation.

[0046] Since the treated liquid contains an appropriate amount of solid matter, the treated liquid can be subjected to good solid-liquid separation, and as a result, the quality of the dehydrated filtrate after solid-liquid separation can be improved.

[0047] <10> a temperature measuring step of measuring the temperature of the solution contained in the oxidation treatment tank, and in the oxygen supplying step, adjusting the amount of oxygen supplied to the solution based on the temperature; <7> ~ <9> 10. The solution processing method according to claim 9, wherein the solution processing method comprises:

[0048] The temperature of the liquid contained in the oxidation treatment tank has a significant effect on the decomposition of organic matter contained in the solution.

[0049] For example, if the temperature of the liquid is high, the decomposition of organic matter can be accelerated. This indicates that when the temperature of the liquid is high, the organic matter can be sufficiently decomposed even if the amount of oxygen supplied to the solution to be treated is reduced.

[0050] Furthermore, if the temperature of the liquid is high, the solubility of hydrogen sulfide, oxygen, and ammonia in the liquid decreases, resulting in higher gas concentrations of hydrogen sulfide, oxygen, and ammonia. Therefore, by measuring the temperature of the solution, changing the hydrogen sulfide and / or oxygen concentrations and the ammonia concentrations, which serve as indicators, based on the temperature, and adjusting the amount of oxygen supplied based on the hydrogen sulfide and / or oxygen concentrations and the ammonia concentrations, it is possible to create conditions suitable for decomposing the organic matter and solid matter contained in the solution.

[0051] On the other hand, if the temperature of the liquid is low, the decomposition of organic matter may be suppressed. This indicates that when the temperature of the liquid is low, it is preferable to increase the amount of oxygen supplied to the solution to be treated in order to sufficiently decompose the organic matter.

[0052] Furthermore, if the temperature of the liquid is low, the solubility of hydrogen sulfide, oxygen, and ammonia in the liquid increases, resulting in a lower gas concentration of hydrogen sulfide, oxygen, and ammonia. Therefore, by measuring the temperature of the solution, changing the hydrogen sulfide and / or oxygen concentration and the ammonia concentration, which serve as indicators, based on the temperature, and adjusting the amount of oxygen supplied based on the hydrogen sulfide and / or oxygen concentration and the ammonia concentration, it is possible to create conditions suitable for decomposing the organic matter and solid matter contained in the solution.

[0053] By adjusting the amount of oxygen supplied to the solution based on the temperature of the liquid contained in the oxidation treatment tank, the amount of organic matter contained in the treatment liquid can be reduced more effectively.

[0054] <11> In the oxygen supplying step, when a new solution to be treated is placed in the oxidation treatment tank, the amount of oxygen to be supplied to the solution is reset to an initial value. <7> ~ <10> 10. The solution processing method according to claim 9, wherein the solution processing method comprises:

[0055] When a new solution to be treated is placed in the oxidation treatment tank, the concentration of hydrogen sulfide contained in the gas in the oxidation treatment tank changes significantly (increases), the concentration of oxygen also changes significantly (decreases), and the concentration of ammonia also changes (decreases), which makes it difficult to adjust the amount of oxygen supplied to the solution.

[0056] When a new solution to be treated is placed in the oxidation treatment tank, the amount of oxygen to be supplied to the solution can be reset to an initial value, thereby simplifying the adjustment of the amount of oxygen to be supplied to the solution.

[0057] <12> The solution to be treated is human waste, septic tank sludge, sewage sludge, agricultural village wastewater sludge, industrial wastewater, food waste, agricultural residue, or livestock manure. <7> ~ <11> 10. The solution processing method according to claim 9, wherein the solution processing method comprises:

[0058] The solution is rich in organic matter and solids, and therefore can be better processed. [Effects of the Invention]

[0059] According to one aspect of the present invention, a solution treatment apparatus and a solution treatment method can be realized that, in an oxidation treatment of a solution to be treated, can promote decomposition of organic matter contained in the solution and can suppress excessive decomposition of solid matter contained in the solution. [Brief explanation of the drawings]

[0060] [Figure 1] 1 is a diagram showing an outline of the configuration of a solution processing apparatus according to one embodiment of the present invention; [Figure 2] 1 is a flowchart showing the procedure of a solution processing method according to one embodiment of the present invention. [Figure 3] 1 is a graph showing the change over time in the concentrations of hydrogen sulfide and ammonia contained in the gas discharged from the acrylic column in an example of the present invention. [Figure 4] 1 is a graph showing the change over time in the concentration of oxygen contained in the gas discharged from the acrylic column in an example of the present invention. [Figure 5] 1 is a graph showing the change over time in the BOD composition of a mixed liquid extracted from the inside of an acrylic column in an example of the present invention. [Figure 6] 1 is a graph showing the change over time in the concentration of BOD components in a mixed liquid before and after shaking treatment under various temperature conditions in an example of the present invention. [Figure 7] 1 is a graph showing the time course of the concentrations of SS and fibrous material in a mixed liquid before and after shaking treatment under various temperature conditions in an example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0061] An embodiment of the present invention is described below, but the present invention is not limited thereto. The present invention is not limited to the configurations described below, and various modifications are possible within the scope of the claims. Embodiments and examples obtained by appropriately combining the technical means disclosed in different embodiments and examples are also included in the technical scope of the present invention. Furthermore, all documents described in this specification are incorporated herein by reference. In this specification, when a numerical range is described as "X to Y," this means "at least X and at most Y."

[0062] [1. Solution Treatment Equipment] A solution processing apparatus according to one embodiment of the present invention will be described with reference to FIG.

[0063] A solution treatment apparatus 1 according to one embodiment of the present invention includes an oxygen supply unit 2 that supplies oxygen 15 to a solution 10 to be treated, an oxidation treatment tank 3 that stores the solution 10 to which oxygen 15 has been supplied and oxidizes the solution 10 to obtain a treatment liquid 11, and a concentration measurement unit 4 that measures the concentrations of hydrogen sulfide and / or oxygen and ammonia contained in gas 16 in the oxidation treatment tank 3. The oxygen supply unit 2 adjusts the amount of oxygen 15 to be supplied to the solution 10 based on the concentrations of hydrogen sulfide and / or oxygen and the ammonia. Note that the concentration measurement unit 4 may be configured to measure the concentrations of both hydrogen sulfide and oxygen and the ammonia concentration.

[0064] Let us consider a case where the concentration measuring unit 4 is configured to measure the concentrations of gases (concentration of hydrogen sulfide and / or oxygen, and concentration of ammonia) contained in the solution 10 in the oxidation treatment tank 3. In this case, in order to measure the concentrations of the gases contained in the solution 10 in the oxidation treatment tank 3, it is necessary to provide a water quality measuring device in the oxidation treatment tank 3, or to extract the solution 10 from the oxidation treatment tank 3 with a pump and send it to the water quality measuring device.

[0065] However, when a water quality measuring device is provided in the oxidation treatment tank 3 or in the extracted solution 10, the following problems may arise: (a) it is difficult to accurately measure the concentration of the above-mentioned gas contained in the solution 10 because the amount of solution 10 in the oxidation treatment tank 3 increases or decreases; (b) if the water quality measuring device is brought into contact with the solution 10 that has not been subjected to the removal of residue (pretreatment), residue will adhere to the water quality measuring device, preventing the water quality measuring device from functioning normally; and (c) periodic calibration and maintenance of the water quality measuring device will be required.

[0066] On the other hand, in solution treatment apparatus 1 according to one embodiment of the present invention, concentration measurement unit 4 measures the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in gas 16 in oxidation treatment tank 3. This configuration can prevent the above problems (a) to (c) from occurring when using a water quality measuring device.

[0067] The solution treatment device 1 according to one embodiment of the present invention may, for example, (i) be substantially not provided with any configuration other than the oxidation treatment tank 3 for performing microbial treatment (e.g., activated sludge treatment, biofilm treatment, and biological carrier treatment) on the solution 10 and the treatment liquid 11, (ii) be provided with the treatment liquid 11 discharged from the oxidation treatment tank 3 being supplied to the solid-liquid separation section 5 without being subjected to microbial treatment (e.g., activated sludge treatment, biofilm treatment, and biological carrier treatment), (iii) be provided with the treatment liquid 11 discharged from the oxidation treatment tank 3 being directly supplied to the solid-liquid separation section 5, or (iv) be provided with any combination of the configurations (i) to (iii) above.

[0068] The solution 10 to be treated is not limited to any particular type, and may be, for example, human waste, septic tank sludge, sewage sludge, agricultural wastewater sludge, industrial wastewater, food waste, agricultural residues, or livestock manure. The solution 10 contains a large amount of organic matter and solids. A solution treatment device 1 according to one embodiment of the present invention can effectively treat the solution 10.

[0069] The amounts of organic matter and solid matter contained in the solution 10 are not limited. The amount of organic matter contained in 1 L of the solution 10 may be, for example, 100 mg / L to 20,000 mg / L, 500 mg / L to 10,000 mg / L, or 750 mg / L to 7,100 mg / L. Meanwhile, the amount of solid matter contained in 1 L of the solution 10 may be, for example, 300 mg / L to 20,000 mg / L, 500 mg / L to 17,000 mg / L, or 300 mg / L to 10,000 mg / L. The solution 10 can be better treated by the solution treatment apparatus 1 according to one embodiment of the present invention.

[0070] The oxygen supply unit 2 is not limited to a specific configuration as long as it can supply oxygen 15 to the solution 10 to be treated. The oxygen supply unit 2 may include, for example, a blast hole and an aeration blower, and supply oxygen 15 from the blast hole to the solution 10. In this configuration, the amount of oxygen 15 supplied to the solution 10 can be adjusted by, for example, adjusting the output of the aeration blower.

[0071] A gas containing oxygen 15 may be supplied to the solution 10. The gas may be a gas containing at least oxygen, and may also be a gas containing components other than oxygen. For example, oxygen may be supplied to the solution 10 by supplying air to the solution 10. With this configuration, oxygen can be easily and inexpensively supplied to the solution 10 to be treated.

[0072] The configuration of the oxygen supply unit 2 is not limited to the configuration shown in Fig. 1. The oxygen supply unit 2 may, for example, (i) supply oxygen to the solution 10 in the oxidation treatment tank 3, (ii) supply oxygen to the solution 10 before it is introduced into the oxidation treatment tank 3, (iii) supply oxygen to the solution 10 in a first storage tank that contains the solution 10 before it is introduced into the oxidation treatment tank 3, (iv) remove at least a portion of the solution 10 in the oxidation treatment tank 3 from the oxidation treatment tank 3 and supply oxygen to the solution 10, (v) remove at least a portion of the solution 10 in the oxidation treatment tank 3 from the oxidation treatment tank 3 and store it in a second storage tank and supply oxygen to the solution 10 in the second storage tank, or (v) have any combination of the configurations (i) to (v). In the above (ii) to (iv), the solution 10 after oxygen supply is stored in the oxidation treatment tank 3.

[0073] The oxidation treatment tank 3 contains a solution 10 to which oxygen 15 has been supplied, and the solution 10 is subjected to oxidation treatment to obtain a treatment liquid 11.

[0074] The oxidation treatment tank 3 may have any capacity as long as it can accommodate the solution 10 to which oxygen 15 has been supplied. The capacity of the oxidation treatment tank 3 is, for example, 1 m 3 That's it, 1 x 10 3 m 3 or more, or 1×10 6 m 3 More specifically, 1m 3 ~1×10 6 m 3 , 1m 3 ~1×10 3 m 3 , 1m 3 ~10 2 m 3 , or 1m 3 ~10m 3 The capacity of the oxidation treatment tank 3 may be set appropriately depending on the amount and / or type of the solution 10 to be treated.

[0075] In the oxidation treatment tank 3, the solution 10 is subjected to oxidation treatment, and a treated liquid 11 is obtained after the oxidation treatment. The treated liquid 11 can be discharged from the inside of the oxidation treatment tank 3 to the outside.

[0076] In the oxidation treatment, organic matter and solid matter are decomposed by, for example, microorganisms (e.g., aerobic bacteria, facultative anaerobic bacteria, and / or obligate anaerobic bacteria). At this time, by adjusting the amount of oxygen 15 supplied to the solution 10, the decomposition of the organic matter contained in the solution 10 is promoted and excessive decomposition of the solid matter contained in the solution 10 is suppressed. Note that the type of the microorganisms (microbial flora) is not limited, and by adjusting the amount of oxygen 15 supplied to the solution 10, the type of the microorganisms (microbial flora) can be naturally controlled.

[0077] The concentration measuring unit 4 is configured to measure the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas 16 in the oxidation treatment tank 3. The configuration of the concentration measuring unit 4 is not limited, and may be, for example, a combination of a commercially available hydrogen sulfide concentration measuring device or a commercially available oxygen concentration measuring device and a commercially available ammonia concentration measuring device.

[0078] The concentration measuring unit 4 may be configured to measure the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas 16 in the oxidation treatment tank 3, and the location where the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia are actually measured is not limited.

[0079] The concentration measuring unit 4 may be, for example, (i) a unit that measures the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas 16 accumulated inside the oxidation treatment tank 3, (ii) a unit that measures the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas 16 present in a gas exhaust path 20 (e.g., a pipe) connected to the oxidation treatment tank 3 and that discharges the gas 16 accumulated inside the oxidation treatment tank 3 to the outside of the oxidation treatment tank 3, or (iii) a unit that has a configuration that is any combination of the above (i) to (ii).

[0080] There are no particular limitations on the method for discharging the gas 16 accumulated inside the oxidation treatment tank 3 to the outside of the oxidation treatment tank 3 via the gas discharge path 20. For example, oxygen 15 supplied from the oxygen supply unit 2 to the inside of the oxidation treatment tank 3 may be used to push the gas 16 accumulated inside the oxidation treatment tank 3 toward the gas discharge path 20, thereby discharging the gas 16 accumulated inside the oxidation treatment tank 3 to the outside of the oxidation treatment tank 3.

[0081] The oxygen supply unit 2 preferably (i) determines the amount of oxygen 15 to be supplied to the solution 10 based on the concentration of the hydrogen sulfide and / or oxygen, and (ii) reduces the amount of oxygen 15 to be supplied to the solution 10 based on the concentration of the ammonia. With this configuration, not only can the decomposition of organic matter contained in the solution 10 be more effectively promoted, but also excessive decomposition of solid matter contained in the solution 10 can be more effectively suppressed.

[0082] The concentration of hydrogen sulfide and / or oxygen contained in the gas 16 in the oxidation treatment tank 3 functions better as a parameter indicating the minimum amount of oxygen required for the oxidation treatment. For example, a decrease in the concentration of hydrogen sulfide contained in the gas 16 in the oxidation treatment tank 3 or an increase in the concentration of oxygen contained in the gas 16 in the oxidation treatment tank 3 indicates that the minimum amount of oxygen 15 required for the oxidation treatment is being supplied to the solution 10.

[0083] Therefore, the oxygen supply unit 2 can determine the amount of oxygen 15 to be supplied to the solution 10 so that the concentration of hydrogen sulfide contained in the gas 16 in the oxidation treatment tank 3 decreases or the concentration of oxygen contained in the gas 16 in the oxidation treatment tank 3 increases. More specifically, the oxygen supply unit 2 adjusts the output of the aeration blower that constitutes the oxygen supply unit 2 so that the concentration of hydrogen sulfide contained in the gas 16 in the oxidation treatment tank 3 decreases or the concentration of oxygen contained in the gas 16 in the oxidation treatment tank 3 increases, thereby determining the amount of oxygen 15 to be supplied to the solution 10.

[0084] For example, there is no limitation on the rate A (change in hydrogen sulfide concentration / time required for the change in hydrogen sulfide concentration) at which the concentration of hydrogen sulfide contained in the gas 16 in the oxidation treatment tank 3 decreases, and the rate A can be, for example, −10 ppm / h to −1000 ppm / h, −100 ppm / h to −1000 ppm / h, −300 ppm / h to −600 ppm / h, or −400 ppm / h to −500 ppm / h.

[0085] For example, there is no limitation on the set value A of the concentration after the concentration of hydrogen sulfide contained in the gas 16 in the oxidation treatment tank 3 has decreased, and the set value A can be, for example, 0 to 500 ppm, 0 to 400 ppm, 0 to 300 ppm, 0 to 200 ppm, 0 to 100 ppm, 0 to 50 ppm, 0 to 40 ppm, 0 to 30 ppm, 0 to 20 ppm, or 0 to 10 ppm.

[0086] In one embodiment of the present invention, the amount of oxygen 15 supplied to the solution 10 by the oxygen supply unit 2 may be determined so that, for example, the rate A and / or the set value A are as described above.

[0087] For example, the rate B at which the concentration of oxygen contained in the gas 16 in the oxidation treatment tank 3 increases (amount of change in oxygen concentration / time required for the oxygen concentration to change) is not limited. The rate B may be, for example, +0.1% / h to +10.0% / h, +0.1% / h to +9.0% / h, +0.1% / h to +8.0% / h, +0.1% / h to +7.0% / h, +0.1% / h to +6.0% / h, +0.1% / h to +5.0% / h, +0.1% / h to +4.0% / h, +0.1% / h to +3.0% / h, +0.1% / h to +2.0% / h, or +0.1% / h to +1.0% / h. Note that the oxygen concentration indicates the volume ratio of oxygen contained in a unit volume of the gas 16.

[0088] For example, the set value B of the oxygen concentration after the concentration of the oxygen contained in the gas 16 in the oxidation treatment tank 3 has increased is not limited. The set value B may be, for example, 20.0% to 30.0%, 20.0% to 28.0%, 20.0% to 26.0%, 20.0% to 24.0%, 20.0% to 22.0%, or 20.0% to 21.0%. The lower limit of the range of the set value B is not limited to 20.0%, and may be, for example, 20.1%, 20.2%, 20.3%, 20.4%, 20.5%, 20.6%, 20.7%, 20.8%, or 20.9%.

[0089] In one embodiment of the present invention, the amount of oxygen 15 supplied to the solution 10 by the oxygen supply unit 2 may be determined so that, for example, the rate B and / or the set value B are the values ​​described above.

[0090] On the other hand, the concentration of ammonia contained in the gas 16 in the oxidation treatment tank 3 functions better as a parameter indicating the degree of progress of the oxidation treatment. For example, an increase in the concentration of ammonia contained in the gas 16 in the oxidation treatment tank 3 indicates that the oxidation treatment is progressing.

[0091] Therefore, the oxygen supply unit 2 can reduce the amount of oxygen 15 supplied to the solution 10 in response to an increase in the concentration of ammonia contained in the gas 16 in the oxidation treatment tank 3. More specifically, the oxygen supply unit 2 adjusts the output of the aeration blower constituting the oxygen supply unit 2 in response to an increase in the concentration of ammonia contained in the gas 16 in the oxidation treatment tank 3, thereby reducing the amount of oxygen 15 supplied to the solution 10.

[0092] For example, the set value C of the ammonia concentration contained in the gas 16 in the oxidation treatment tank 3 when starting to reduce the amount of oxygen 15 supplied to the solution 10 (or when stopping the supply of oxygen 15 to the solution 10) is not limited. The set value C may be, for example, 10 to 100 ppm, 10 to 50 ppm, 10 to 40 ppm, 10 to 30 ppm, 10 to 20 ppm, or 10 to 15 ppm. The lower limit of the range of the set value B is not limited to 10 ppm, and may be, for example, 15 ppm, 20 ppm, or 30 ppm.

[0093] In one embodiment of the present invention, for example, when the set value C reaches the value described above, the oxygen supply unit 2 may reduce the amount of oxygen 15 supplied to the solution 10.

[0094] The solution processing apparatus 1 according to one embodiment of the present invention preferably includes a solid-liquid separation unit 5 that performs solid-liquid separation of the processing liquid 11. Since the processing liquid 11 contains an appropriate amount of solid matter, the processing liquid 11 can be effectively separated into solid and liquid, and as a result, the quality of the dehydrated filtrate after solid-liquid separation can be improved.

[0095] The solid-liquid separation unit 5 is not limited to a specific configuration as long as it can separate the treatment liquid 11 into liquid and solid. The solid-liquid separation unit 5 may be, for example, (i) a unit equipped with a gravity settling type settling tank, (ii) a unit equipped with a separation machine for solid-liquid separation, or (iii) a unit equipped with any combination of the above (i) to (ii).

[0096] The volume of the settling tank is not limited as long as it can accommodate the treatment liquid 11. The volume of the settling tank is, for example, 1 m 3 That's it, 1 x 10 3 m 3 or more, or 1×10 6 m 3 More specifically, 1m 3 ~1×10 6 m 3 , 1m 3 ~1×10 3 m 3 , 1m 3 ~10 2 m 3 , or 1m 3 ~10m 3 The capacity of the settling tank may be set appropriately depending on the amount and / or type of the treatment liquid 11 to be contained.

[0097] The separation machine is not limited to a specific type as long as it can separate the treatment liquid 11 into a liquid and a solid. The separation machine may be, for example, a vacuum dehydrator, a centrifugal dehydrator, a pressure filter, a belt press dehydrator, an electroosmotic dehydrator, or a screw press dehydrator. From the viewpoint of effectively separating the treatment liquid 11 into a liquid and a solid, the separation machine is preferably a centrifugal dehydrator or a screw press dehydrator.

[0098] The separation machine may be one that utilizes membrane separation, such as an ultrafiltration membrane or a microfiltration membrane. It may be a separation membrane installed inside a tank (for example, a submerged membrane separation membrane) or a separation membrane installed outside a tank. The separation membrane may be a flat membrane or a tubular membrane.

[0099] The solution treatment apparatus 1 according to one embodiment of the present invention preferably includes a temperature measurement unit 6 that measures the temperature of the solution 10 contained in the oxidation treatment tank 3, and the oxygen supply unit 2 adjusts the amount of oxygen 15 supplied to the solution 10 based on the temperature. According to this configuration, by adjusting the amount of oxygen 15 supplied to the solution 10 based on the temperature of the solution 10 contained in the oxidation treatment tank 3, the amount of organic matter contained in the treatment liquid 11 can be reduced more effectively.

[0100] The temperature measurement unit 6 may be configured in any way as long as it can measure the temperature of the solution 10 contained in the oxidation treatment tank 3, and may be, for example, a commercially available temperature measurement device.

[0101] The oxygen supply unit 2 can adjust (increase or decrease) the amount of oxygen 15 supplied to the solution 10 based on the temperature of the solution 10 contained in the oxidation treatment tank 3. More specifically, the oxygen supply unit 2 can adjust the output of the aeration blower that constitutes the oxygen supply unit 2 based on the temperature of the solution 10 contained in the oxidation treatment tank 3, thereby adjusting (increase or decrease) the amount of oxygen 15 supplied to the solution 10.

[0102] For example, there is no limitation on the set value D of the temperature of the solution 10 contained in the oxidation treatment tank 3 when adjusting the amount of oxygen 15 supplied to the solution 10. The set value D can be, for example, any temperature in the range of 0°C to 100°C, any temperature in the range of 0°C to 50°C, any temperature in the range of 0°C to 40°C, any temperature in the range of 0°C to 30°C, or any temperature in the range of 10°C to 30°C (e.g., 10°C, 20°C, and / or 30°C).

[0103] When a new solution 10 to be treated (fresh solution 10) is placed in the oxidation treatment tank 3, the oxygen supply unit 2 preferably resets the amount of oxygen 15 to be supplied to the solution 10 to an initial value.

[0104] When a new solution 10 to be treated is placed in the oxidation treatment tank 3, the concentration of hydrogen sulfide contained in the gas in the oxidation treatment tank 3 changes (increases) significantly, the concentration of oxygen also changes (decreases) significantly, and the concentration of ammonia also changes (decreases). As a result, adjusting the amount of oxygen 15 to be supplied to the solution 10 becomes complicated. If the amount of oxygen 15 to be supplied to the solution 10 is reset to an initial value when the new solution 10 to be treated is placed in the oxidation treatment tank 3, adjustment of the amount of oxygen 15 to be supplied to the solution 10 can be simplified.

[0105] The initial value is not limited to any particular value, and may be, for example, the amount of oxygen 15 supplied to solution 10 (solution 10 before a new solution is added) at the start of operation of solution treatment apparatus 1. More specifically, when the start of operation of solution treatment apparatus 1 is designated as time 0, the initial value may be, for example, (i) the amount of oxygen 15 supplied to solution 10 at any time between time 0 and 1 hour, (ii) the amount of oxygen 15 supplied to solution 10 at any time between time 0 and 30 minutes, (iii) the amount of oxygen 15 supplied to solution 10 at any time between time 0 and 10 minutes, or (iv) the amount of oxygen 15 supplied to solution 10 at any time between time 0 and 1 minute.

[0106] In order to reset the amount of oxygen 15 supplied to the solution 10 to the initial value, for example, the output of the aeration blower constituting the oxygen supply unit 2 may be adjusted, thereby resetting the amount of oxygen 15 supplied to the solution 10 to the initial value.

[0107] 2. Solution Processing Method A solution processing method according to one embodiment of the present invention will be described with reference to Figures 1 and 2. Note that the description of the configuration described above in [1. Solution Processing Apparatus] will basically be omitted below.

[0108] A solution processing method according to one embodiment of the present invention includes an oxygen supply step S1 in which oxygen 15 is supplied to a solution 10 to be processed, an oxidation treatment step S2 in which the solution supplied with oxygen 15 is placed in an oxidation treatment tank 3 and oxidized to obtain a treatment solution 11, and a concentration measurement step S3 in which the concentrations of hydrogen sulfide and / or oxygen and ammonia contained in the gas in the oxidation treatment tank 3 are measured, and the amount of oxygen 15 supplied to the solution 10 in the oxygen supply step S1 is adjusted based on the concentrations of hydrogen sulfide and / or oxygen and the ammonia. Note that the concentration measurement step S3 may be configured to measure the concentrations of both hydrogen sulfide and oxygen and the ammonia concentration.

[0109] The oxygen supply step S1 can be performed by the oxygen supply unit 2, the oxidation treatment step S2 can be performed by the oxidation treatment tank 3, and the concentration measurement step S3 can be performed by the concentration measurement unit 4. Details of the oxygen supply unit 2, the oxidation treatment tank 3, and the concentration measurement unit 4 have been explained in the above section [1. Solution Treatment Apparatus], and therefore will not be explained here.

[0110] The solution 10 to be treated is not limited to, and may be, for example, human waste, septic tank sludge, sewage sludge, agricultural wastewater sludge, industrial wastewater, food waste, agricultural residue, or livestock manure. The solution 10 contains a large amount of organic matter and solid matter. A solution treatment method according to one embodiment of the present invention can effectively treat the solution 10.

[0111] The details of the solution 10 have been explained in the above section [1. Solution Processing Apparatus], and therefore will not be explained here.

[0112] In the oxygen supply step S1, it is preferable to (i) determine the amount of oxygen 15 to be supplied to the solution 10 based on the concentration of hydrogen sulfide and / or oxygen, and (ii) reduce the amount of oxygen 15 to be supplied to the solution 10 based on the concentration of ammonia. This configuration not only effectively promotes the decomposition of organic matter contained in the solution 10, but also effectively suppresses excessive decomposition of solid matter contained in the solution 10.

[0113] The oxygen supply step S1 can be performed by the oxygen supply unit 2. Details of the oxygen supply unit 2 have been explained above in [1. Solution Treatment Apparatus], and therefore will not be explained here.

[0114] The solution treatment method according to one embodiment of the present invention preferably includes a solid-liquid separation step S5 of performing solid-liquid separation on the treated liquid 11. Since the treated liquid 11 contains an appropriate amount of solid matter, the treated liquid 11 can be effectively separated into solid and liquid, thereby improving the quality of the dehydrated filtrate after solid-liquid separation.

[0115] The solid-liquid separation step S5 can be performed by the solid-liquid separation unit 5. Details of the solid-liquid separation unit 5 have been explained above in [1. Solution Treatment Apparatus], and therefore will not be explained here.

[0116] A solution processing method according to one embodiment of the present invention preferably includes a temperature measurement step S4 for measuring the temperature of the solution 10 contained in the oxidation treatment tank 3, and in the oxygen supply step S1, the amount of oxygen 15 supplied to the solution 10 is adjusted based on the temperature. According to this configuration, by adjusting the amount of oxygen 15 supplied to the solution 10 based on the temperature of the solution 10 contained in the oxidation treatment tank 3, the amount of organic matter contained in the processing liquid 11 can be reduced more effectively.

[0117] The temperature measurement step S4 can be performed by the temperature measurement unit 6. Details of the temperature measurement unit 6 have been explained in the above section [1. Solution Treatment Apparatus], and therefore will not be explained here.

[0118] In the oxygen supply step S1, when a new solution 10 to be treated (fresh solution 10) is placed in the oxidation treatment tank 3, it is preferable to reset the amount of oxygen 15 to be supplied to the solution 10 to an initial value.

[0119] When a new solution 10 to be treated is placed in the oxidation treatment tank 3, the concentration of hydrogen sulfide contained in the gas in the oxidation treatment tank 3 changes (increases) significantly, the concentration of oxygen also changes (decreases) significantly, and the concentration of ammonia also changes (decreases). As a result, adjusting the amount of oxygen 15 to be supplied to the solution 10 becomes complicated. If the amount of oxygen 15 to be supplied to the solution 10 is reset to an initial value when the new solution 10 to be treated is placed in the oxidation treatment tank 3, adjustment of the amount of oxygen 15 to be supplied to the solution 10 can be simplified.

[0120] The oxygen supply step S1 can be performed by the oxygen supply unit 2. Details of the oxygen supply unit 2 have been explained above in [1. Solution Treatment Apparatus], and therefore will not be explained here.

[0121] According to one embodiment of the present invention, a solution treatment apparatus and a solution treatment method can be realized that, during oxidation treatment of a solution to be treated, can promote decomposition of organic matter contained in the solution while suppressing excessive decomposition of solids contained in the solution. By performing solid-liquid separation of the solution after such oxidation treatment, solids and liquid (dehydrated filtrate) can be effectively separated, thereby improving the quality of the dehydrated filtrate. This effect may contribute to achieving, for example, Goal 6 of the United Nations' Sustainable Development Goals (SDGs), "Clean Water and Sanitation." [Example]

[0122] <1. Column test> <1-1. Test method> A cylindrical acrylic column (corresponding to the oxidation treatment tank) with an inner diameter of 35 mm and a volume of 962 mL was sealed with stoppers at the top and bottom to seal the inside of the acrylic column. Next, a tube for introducing air into the acrylic column was inserted into the bottom of the acrylic column, and a tube for discharging gas from the inside of the acrylic column was inserted into the top of the acrylic column.

[0123] A planned amount (800 mL) of a mixture of human waste and other liquids (20% human waste, 80% septic tank sludge) was poured into the acrylic column. The temperature inside the acrylic column was maintained at a constant temperature (10°C) by exposing the outside of the acrylic column to hot or cold water.

[0124] An example of the solution treatment device of the present invention was reproduced by introducing air (200 mL air / min) into the interior of the acrylic column from the lower tube of the acrylic column and discharging the gas inside the acrylic column from the upper tube of the acrylic column.

[0125] The concentrations of oxygen, hydrogen sulfide, and ammonia contained in the gas discharged from the upper tube of the acrylic column were measured using a commercially available measuring device. In addition, the mixed liquid inside the acrylic column was extracted at predetermined times, and the water quality of the mixed liquid was measured using a commercially available measuring device.

[0126] <1-2. Test Results> (Test result 1) Figure 3 shows the time-dependent changes in the concentrations of hydrogen sulfide and ammonia contained in the gas discharged from the upper tube of the acrylic column.

[0127] As is clear from Figure 3, the concentration of hydrogen sulfide contained in the gas discharged from the upper tube of the acrylic column rose immediately after air began to be introduced into the acrylic column from the lower tube, and reached 324 ppm 5 minutes after the start of air introduction. Thereafter, the hydrogen sulfide concentration rapidly decreased, and fell below the detection limit 50 minutes after the start of air introduction.

[0128] Meanwhile, the ammonia concentration in the gas discharged from the upper tube of the acrylic column was below the detection limit in the early stages after air was introduced into the acrylic column from the lower tube. The ammonia concentration increased as the hydrogen sulfide concentration decreased. The ammonia concentration reached 10 ppm 24 minutes after air introduction began and gradually increased thereafter.

[0129] (Test result 2) Figure 4 shows the change over time in the oxygen concentration contained in the gas discharged from the upper tube of the acrylic column.

[0130] As is clear from Figure 4, the oxygen concentration in the gas discharged from the upper tube of the acrylic column was 19.9% ​​immediately after air began to be introduced into the acrylic column from the lower tube, but it quickly rose to 20.5% 18 minutes after the start of air introduction and 20.7% 50 minutes after the start of air introduction. The oxygen concentration gradually increased as the hydrogen sulfide concentration decreased and the ammonia concentration increased.

[0131] (Test result 3) Figure 5 and Table 1 show the change over time in the BOD composition of the mixed liquor extracted from the inside of the acrylic column. In Figure 5 and Table 1, "BOD" indicates the BOD of the entire mixed liquor, including human waste, "P-BOD" indicates the BOD of solids, "S-BOD" indicates the BOD of soluble matter, "SS" indicates suspended matter, and "fibrous matter" indicates coarse suspended matter.

[0132] In this example, we focused on the decomposition of organic matter and solid matter contained in the mixed liquor. Of the BOD, P-BOD, S-BOD, SS, and fibrous matter, S-BOD is an indicator of the decomposition of soluble organic matter, and P-BOD is an indicator of the decomposition of solid organic matter. Furthermore, fibrous matter is an indicator of the separation and dewatering of solid matter in the solid-liquid separation section.

[0133] As shown in Figure 5 and Table 1, at the time when the elapsed time was 0 hours, the P-BOD value of the mixed liquid inside the acrylic column was 445 mg / L and the S-BOD value was 615 mg / L.

[0134] When air was introduced into the acrylic column from the lower tube, S-BOD (dissolved organic matter) decreased and P-BOD (solid organic matter) increased over time.

[0135] (Summary of test results) As is clear from FIG. 3, in this test, the concentrations of hydrogen sulfide and ammonia contained in the gas discharged from the upper tube of the acrylic column showed characteristic changes.

[0136] More specifically, the hydrogen sulfide concentration showed a rapid decrease in the initial stage of air introduction, and then fell below the detection limit. This indicates that the hydrogen sulfide dissolved in the human waste and other mixed liquid inside the acrylic column before the start of air introduction was discharged from the human waste and other mixed liquid inside the acrylic column to the outside at the initial stage of air introduction, and that an appropriate amount of air was introduced into the acrylic column thereafter so that hydrogen sulfide would not remain inside the acrylic column.

[0137] On the other hand, the ammonia concentration was below the detection limit in the early stage of air introduction and showed a tendency to increase towards the later stage of air introduction, which indicates that a large amount of ammonia is generated as the oxidation process in the acrylic column progresses.

[0138] As is clear from Figure 4, in this test, the concentration of oxygen contained in the gas discharged from the upper tube of the acrylic column showed a characteristic change.

[0139] More specifically, the oxygen concentration showed a tendency to increase rapidly at the beginning of the air introduction, and gradually increased as the oxidation treatment in the acrylic column progressed. This indicates that reducing substances such as hydrogen sulfide that had been dissolved in the human waste mixed liquid inside the acrylic column before the air introduction started consumed oxygen inside the acrylic column at the beginning of the air introduction, causing the oxygen concentration in the exhausted gas to decrease, and that thereafter an appropriate amount of air was introduced into the acrylic column to the extent that reducing substances such as hydrogen sulfide did not increase inside the acrylic column.

[0140] 3 to 5 and Table 1, it is clear that (i) introducing an appropriate amount of air into the acrylic column based on the concentration of hydrogen sulfide and / or oxygen contained in the gas discharged from the upper tube of the acrylic column, and (ii) reducing the amount of air introduced into the acrylic column based on the concentration of ammonia contained in the gas discharged from the upper tube of the acrylic column (for example, terminating the introduction of air into the acrylic column based on the concentration of ammonia contained in the gas discharged from the upper tube of the acrylic column), not only can the decomposition of organic matter contained in the mixed liquid be promoted, but also the decomposition of solid matter contained in the mixed liquid can be suppressed.

[0141] Furthermore, the solid matter's dewatering properties enable efficient solid-liquid separation. In this test, the P-BOD value of the mixed liquor increased as the oxidation treatment progressed. Meanwhile, the fibrous matter only decreased by 2.9 points. This indicates that if the mixed liquor after oxidation treatment is subjected to solid-liquid separation, the solids and liquid (dehydrated filtrate) can be effectively separated, improving the quality of the dehydrated filtrate (in other words, the BOD value of the dehydrated filtrate can be reduced).

[0142] [Table 1]

[0143] <2. Shaking test> <2-1. Test method> The effect of supplying air to the solution to be treated was examined under various temperature conditions.

[0144] A 250 mL mixture of human waste (20% human waste, 80% septic tank sludge) was placed in a 500 mL Erlenmeyer flask and shaken for 16 hours at various temperatures: 10°C (corresponding to winter), 20°C (corresponding to spring and autumn), and 30°C (corresponding to summer).

[0145] After the shaking treatment, the mixed solution was extracted from the Erlenmeyer flask, and the water quality of the mixed solution was measured using a commercially available measuring device.

[0146] <2-2. Test Results> Figure 6 shows the test results for P-BOD and S-BOD of the mixed liquor before and after shaking treatment, while Figure 7 shows the test results for SS and fibrous matter of the mixed liquor before and after shaking treatment.

[0147] As is clear from Figure 6, the S-BOD (dissolved organic matter) values ​​varied depending on the temperature. Specifically, the S-BOD (dissolved organic matter) values ​​decreased as the temperature increased. On the other hand, the P-BOD (solid organic matter) values ​​were large at all temperatures.

[0148] As is clear from Figure 7, the concentration of SS removed by solid-liquid separation did not decrease with increasing temperature, but rather increased slightly with increasing temperature. On the other hand, the concentration of fibrous matter, which affects the performance of solid-liquid separation, did not decrease with increasing temperature, but rather increased slightly with increasing temperature. This indicates that SS and fibrous matter do not have a negative effect on solid-liquid separation after air supply. [Industrial Applicability]

[0149] The present invention can be used to treat solutions (for example, human waste, septic tank sludge, sewage sludge, agricultural village wastewater sludge, industrial wastewater, food waste, agricultural residues, and livestock manure). [Explanation of symbols]

[0150] 1 Solution treatment equipment 2. Oxygen supply unit 3. Oxidation tank 4 Concentration measuring section 5 Solid-liquid separation section 6 Temperature measurement section 10 solution 11 Processing liquid 15 Oxygen 16 Gases 20 Gas exhaust passage S1 Oxygen supply process S2 Oxidation treatment process S3 Concentration measurement process S4 Temperature measurement process S5 Solid-liquid separation process

Claims

1. an oxygen supply unit that supplies oxygen to the solution to be treated; an oxidation treatment tank that contains the solution to which oxygen has been supplied and oxidizes the solution to obtain a treatment liquid; a concentration measuring unit that measures the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas in the oxidation treatment tank, The oxygen supply unit adjusts the amount of oxygen to be supplied to the solution based on the concentration of the hydrogen sulfide and / or oxygen and the concentration of the ammonia.

2. 2. The solution treatment apparatus according to claim 1, wherein the oxygen supplying unit (i) determines an amount of oxygen to be supplied to the solution based on the concentration of the hydrogen sulfide and / or oxygen, and (ii) reduces an amount of oxygen to be supplied to the solution based on the concentration of the ammonia.

3. The solution treatment apparatus according to claim 1 , further comprising a solid-liquid separation section for separating the treatment solution into solid and liquid.

4. a temperature measuring unit for measuring the temperature of the solution contained in the oxidation treatment tank; The solution processing apparatus according to claim 1 , wherein the oxygen supplying section adjusts the amount of oxygen supplied to the solution based on the temperature.

5. 2. The solution treatment apparatus according to claim 1, wherein the oxygen supplying unit resets the amount of oxygen to be supplied to a new solution to an initial value when the new solution to be treated is placed in the oxidation treatment tank.

6. 2. The solution treatment apparatus according to claim 1, wherein the solution to be treated is human waste, septic tank sludge, sewage sludge, agricultural village wastewater sludge, industrial wastewater, food waste, agricultural residues, or livestock manure.

7. an oxygen supply step of supplying oxygen to the solution to be treated; an oxidation treatment step of placing the oxygen-supplied solution in an oxidation treatment tank and oxidizing the solution to obtain a treatment liquid; a concentration measuring step of measuring the concentration of hydrogen sulfide and / or oxygen and the concentration of ammonia contained in the gas in the oxidation treatment tank, A solution treatment method, wherein in the oxygen supplying step, an amount of oxygen supplied to the solution is adjusted based on the concentration of the hydrogen sulfide and / or oxygen and the concentration of the ammonia.

Images