JPH0566199B2 - - Google Patents

Description

[Detailed description of the invention]

(Field of Industrial Application) This invention was developed in light of the fact that the inventors have recently begun to notice the usefulness of microbial metabolites containing phenol and/or compounds with exposed phenol groups in the field of wastewater treatment, etc. The content is that phenols and/or substances produced by the activities of soil aerobic bacteria and soil facultative anaerobic bacteria are added to wastewater containing organic substances.
By contacting and mixing metabolites containing compounds with exposed phenol groups, the organic matter in the wastewater reacts with the metabolites to form chemical and/or biological sludge, and then the unreacted organic matter and the metabolites react. By coexisting with the above chemical and/or biological sludge, a lump product is formed, and at the same time, due to the action of antibacterial substances contained in the metabolites, Escherichia coli and putrefactive bacteria contained in the wastewater are etc. The present invention relates to a method for treating wastewater containing organic substances, which is characterized by suppressing the action of harmful bacteria and preventing quality deterioration such as putrefaction of the bulk products. (Prior art) As is well known, various wastewater treatment methods include:
Various biological treatment methods are already in use. All of these conventional methods are aimed at reducing the molecular weight and gasifying organic substances contained in wastewater, and are broadly classified into aerobic biological treatment methods and anaerobic biological treatment methods. In the aerobic biological treatment method,
The activated sludge method is the most typical method in which aerobic bacteria are activated by maintaining the dissolved oxygen concentration in wastewater at 1.0 ppm or higher, and organic matter is oxidized and decomposed by the action of the bacteria. Similarly, anaerobic biological treatment aims to reduce the molecular weight and decompose organic matter through the action of anaerobic bacteria, and includes digestion methods, methane fermentation methods, and the like. Another method that uses both aerobic and anaerobic biological treatment methods is a treatment method for the purpose of denitrification, which also aims at decomposing and gasifying organic matter. However, since these conventional biological treatment methods aim to reduce the molecular weight of organic matter contained in wastewater and gasify it, aerobic biological treatment requires a lot of time, equipment, and operating costs for aeration. There are problems such as the need for a large number of treatments and the complexity of the operation manager, and anaerobic biological treatment methods have problems such as generation of bad odors and prolonged residence time. Treatment by adding enzymes has been considered as a solution to these problems, but this has not produced satisfactory results. (Problems common to conventional technologies) Conventional technologies related to the treatment of wastewater containing organic substances all involve the coexistence of soil facultative anaerobic bacteria or soil facultative anaerobic bacteria and aerobic bacteria. The reason why aerobic bacteria and facultative anaerobic bacteria of the general soil bacterial group are affected by the external environment This is because they were not aware that there was a duality in the metabolic circuit due to differences in the (Means for Solving the Problems) This invention has been made to solve the above problems, and it is possible to treat wastewater extremely efficiently and in a short time, regardless of the BOD concentration, thereby reducing operating costs. The purpose is to reduce the amount of wastewater, downsize the equipment, simplify operation management, and further stabilize and improve the quality of the generated sludge. A method for treating wastewater containing organic substances that is sequentially sent to a reaction process and a concentration process, and a part of the mixed solution containing sludge-like reactants separated in the concentration process is returned to the reaction process via a culture system. It's hot,
The culture system comprises an adjustment step and a culture step, and the bacteria group included in the wastewater circulation system including the culture system is a group of soil-based obligate anaerobic bacteria and a phenol or/and a compound having a phenol exposed group. A group of soil facultative anaerobic bacteria adapted to produce metabolites containing , or bacteria in which a bacterial group consisting of the adapted soil facultative anaerobic bacteria and soil aerobic bacteria coexist. Furthermore, in the culture system, phenol or/and phenol-exposed groups are added to the reaction process by increasing as much as possible the amount of metabolites containing phenol or/and compounds with phenol-exposed groups due to the activity of bacterial groups. supplying metabolites containing certain compounds;
In the reaction step, chemical and/or biological sludge is formed by mixing raw wastewater with phenols and/or metabolites containing compounds with phenol-exposed groups fed from the culture system. Then, unreacted organic matter and the chemical or/and biological sludge coexist to form a lumpy product, and in the concentration step, the sludge-like and lumpy reactants sent from the reaction step are A wastewater treatment system has been formed which concentrates and separates the mixed liquid containing the liquid, and at the same time returns a part of the concentrated liquid to the culture system. SUMMARY OF NEW THEORY RELATED TO THE TECHNOLOGY This invention provides microbial metabolites containing phenols or/and compounds with exposed phenol groups, and soil-borne facultative anaerobic products adapted to produce the metabolites. Since this technology is completely different from conventional technology in that it utilizes sexual bacteria and aerobic bacteria, and aims to solve various problems faced by conventional technology, we will provide an overview of the basic theory before explaining the technology. That's it. (b) Dual nature of metabolic circuits Aerobic bacteria and facultative anaerobic bacteria of the general soil bacteria group have dual nature of metabolic circuits. The first is a metabolic circuit that functions in the presence of free oxygen, and the second is a metabolic circuit that functions in the absence of free oxygen. From a material standpoint, the metabolites produced by the former do not contain phenolic compounds, whereas the metabolites produced by the latter contain phenol or/and a compound with a phenol-exposed group. The latter metabolic cycle is carried out in the presence of phenols and/or metabolites containing compounds with phenol-exposed groups, or substances containing such metabolites (such as humic plants), or in the presence of the bacterial groups (aerobic and facultative). anaerobic bacteria) actively coexist with soil-based obligate facultative bacteria in the absence of free oxygen.
It's something that works. Note that oxygen is supplied to aerobic bacteria and facultative anaerobic bacteria in the absence of free oxygen by intramolecular oxygen via a donor. After soil facultative anaerobes and aerobic bacteria have been acclimated to produce phenols or/and compounds with phenol-exposed groups, they can survive for a period of time, even to a considerable extent, in the presence of free oxygen. Metabolites containing phenol and/or compounds with exposed phenol groups are continuously produced over a long period of time. The prior art does not focus on the duality of the metabolic circuit, and therefore does not have a method for controlling the duality of the metabolic circuit, resulting in the various problems described above. (b) Control of metabolic functions As stated in the previous section, soil-borne facultative anaerobic bacteria and aerobic bacteria have dual metabolic circuits. Which of these is expressed is originally determined by the living environment of the bacterium, but in artificial environments, non-phenol metabolic activities are generally expressed regardless of the presence or absence of free oxygen. Even if the bacterium has a functioning phenolic metabolic cycle, when placed in an artificial environment, it will normally be denatured to express non-phenolic metabolic activity instead of phenolic metabolic activity. be. Regardless of the presence or absence of free oxygen, in order for the bacterial group to express and continue its phenolic metabolic function in an artificial environment, the bacterial group must under certain conditions It is essential that a compound remains in the presence of a metabolite containing it. To achieve this, it is necessary to add <a metabolite containing a phenol or/and a compound with a phenol exposed group, or a substance containing the metabolite (e.g., humic plants, etc.)> from outside the system, or to add a phenol-based metabolic product that exists in nature. It is essential to utilize this group of bacteria whose functions have been abnormally enhanced as seed bacteria. The inoculum here refers to a soil facultative anaerobic bacterial group that produces a metabolite containing phenol or/and a compound with a phenol exposed group, or a soil facultative anaerobic bacterial group that produces a metabolite containing phenol or/and a compound with a phenol exposed group. It actively coexists with bacterial groups consisting of sexual bacteria and aerobic bacteria, and the antibacterial action of the metabolites can inactivate or inactivate bacterial groups other than soil bacteria, especially harmful bacteria such as Escherichia coli and spoilage bacteria. It means a group of bacteria in a sterile state. The above-mentioned bacterial groups that can be used as inoculum are generated in drainage channels for livestock wastewater, etc., where the generated sludge is deposited in depressions etc. in the drainage channels, etc., and the sludge flows slowly over the sludge deposited surface. It can be collected relatively easily at locations where it occurs constantly and where the above conditions continue for a long period of time, such as several years or more. In such places, if the sludge contains phenol or/and a compound with an exposed phenol group, bacteria that can be used as seed bacteria can be collected by collecting wastewater mixed with sludge from the boundary between the sludge deposition surface and the wastewater. group is available. In addition,
The presence of phenol or/and a compound having a phenol-exposed group can usually be visually confirmed by the generation of a phenol odor. (c) Basic reactions Organic substances (organic aqueous solutions and hydrous organic mixtures)
When a microbial metabolite containing phenol or/and a compound with a phenol-exposed group is added, it rapidly binds, becomes particles, aggregates, condenses, and polymerizes to form macromolecules and bulk products. (Basic Reaction 1) During the above reaction, if a substance containing a large amount of activated silicic acid is added, a polycondensation reaction for humification will occur. (Basic reaction 2) The above-mentioned <compound having a phenol exposed group> refers to organic substances in general having a phenol exposed group, but oxygen having a phenol exposed group is particularly effective. Moreover, <substance containing a large amount of activated silicic acid> refers to an unstable substance having an andesitic or rhyolitic composition and having a high degree of activity, such as volcanic glass. In the following, only descriptions related to Basic Reaction 1 will be made, but if a substance containing a large amount of activated silicic acid is installed or added to any part of the wastewater treatment system, or if the substance is present in the raw wastewater. When it is contained, for example, in clay minerals in paper manufacturing wastewater, mineral fillers contained in synthetic feed in swine wastewater, etc., all reactions occur as basic reaction 2. The difference between Basic Reaction 1 and Basic Reaction 2 is that the chelate structure in the reaction product is often more pronounced in the substance produced by Basic Reaction 2, and therefore the removal of inorganic ionic substances from organic wastewater. When the purpose is also to use, it is advisable to incorporate a substance containing a large amount of activated silicic acid into the reaction system. Note that this does not mean that a chelate structure does not develop in the reaction product of Basic Reaction 1, but only that the development of a chelate structure is accompanied by more technical difficulties. (d) Macromolecularization and oxygen reaction This reaction is completely different from oxygen decomposition. This is clear from the fact that in oxygen decomposition, the molecular weight of the product decreases as the reaction progresses, but the molecular weight of the organic substance steadily increases in the reaction. The relationship between the formation of macromolecules and the oxygen reaction is as shown in Figure 1, and since microbial metabolites always contain oxygen, the formation of macromolecules proceeds simultaneously with the non-degradable oxygen reaction. . As a result, for example, in the case of malodorous substances, the generation of malodors from the system is due to an increase in molecular weight due to the progress of basic reaction 1 or basic reaction 2, and a transition to a stable substance due to the non-decomposable oxygen reaction that proceeds simultaneously. There isn't. (e) Reaction product and chelate structure The PH fluctuations during the culture process of the acclimatized facultative anaerobic bacteria and aerobic bacteria are shown schematically in FIG. 2. Although the metabolites produced by soil bacteria are acidic solutions because they contain organic acids, the reason why the culture solution produced by soil bacteria exhibits the PH fluctuations shown in the figure is due to the pH fluctuations in the culture solution. It can only be understood by analyzing it in conjunction with the dynamics of inorganic ionic substances. Cultured sludge under conditions for producing metabolites containing phenol and/or compounds with exposed phenol groups has a chelate structure, and the inner surface of the chelate is an aggregate of + and - groups. Therefore,
In the presence of the metabolite, + of the produced sludge,
Substitution of ionic substances in -groups and growth of chelate structures. Due to the deformation and at the same time the production of organic acid salts, the pH of the culture solution changes and inorganic ionic substances are removed from the solution. (f) Mechanism of antibacterial properties Generally, microorganisms have antibacterial properties against organisms other than themselves (molds). Antibacterial properties are expressed through metabolites, and therefore, metabolites secreted by a certain individual are harmful to organisms other than that individual (molds), whereas metabolites secreted by a certain species are harmful to organisms other than the individual (molds). Metabolites secreted from a colony composed of various microorganisms have antibacterial properties against (fungal) organisms other than the species and genus that constitute the colony. It happens. Microbial metabolites containing phenol and/or compounds with phenol-exposed groups are metabolites of the general soil bacterial group as a whole, so these metabolites have no effect on organisms other than the general soil bacterial group (molds). It has remarkable antibacterial properties. (Function) In the wastewater treatment system, organic matter in the wastewater reacts physicochemically with phenols and/or metabolites containing compounds with phenol-exposed groups produced by aerobic bacteria and facultative anaerobic bacteria. This causes it to turn into macromolecules and sludge.
Therefore, the residence time in the reaction process is short, and the presence or absence of aeration has essentially no relation to the progress of the reaction. In addition, the bacterial groups that act in this wastewater treatment system include soil-based obligate anaerobic bacteria and soil-based facultative bacteria that have been adapted to produce metabolites containing phenols and/or compounds with exposed phenol groups. The bacterial group may be either an anaerobic bacterial group or a bacterial group in which the acclimatized soil facultative anaerobic bacteria and soil aerobic bacteria coexist. In addition, as the soil aerobic bacteria group in the invention, for example, Zooglaea bacteria can be used. Furthermore, as the soil-borne facultative anaerobic bacteria, for example, Bacillus bacteria can be used. Among the culture systems in the wastewater treatment system,
In the adjustment step in which the soil obligate anaerobic bacteria are maintained under absolute anaerobic conditions, the soil obligate anaerobic bacteria become apparent, and the soil facultative anaerobic bacteria and soil aerobic bacteria become active while being supplied with intramolecular oxygen. They live together. By sustaining this symbiotic relationship, the phenolic metabolic functions of the soil facultative anaerobic bacteria and the soil aerobic bacteria are further strengthened.
Note that facultative anaerobic bacteria and aerobic bacteria that can coexist with soil-based obligate anaerobic bacteria are not limited to the soil-based bacteria described above, but also include soil-based facultative anaerobic bacteria and soil-based aerobic bacteria. However, when soil facultative anaerobic bacteria and soil aerobic bacteria that do not exhibit phenolic metabolic functions coexist, the antibacterial effect of the metabolites produced against bacterial groups other than soil bacterial groups is weak. As a result, facultative anaerobic bacteria and aerobic bacteria that coexist with the soil-based obligate anaerobic bacteria migrate to bacterial groups other than the soil bacterial group. Therefore, the inoculum introduced during operation of the wastewater treatment system is the soil-based obligate anaerobic bacteria that has been adapted to produce metabolites containing phenol and/or compounds with exposed phenol groups. Cohabiting with a group of sexually anaerobic bacteria or a group of bacteria consisting of the soil facultative anaerobic bacteria and soil aerobic bacteria,
In addition, harmful bacteria other than soil bacteria such as Escherichia coli and putrid bacteria must be inactivated or killed. In processes other than the above-mentioned adjustment process in the wastewater treatment system, the soil obligate anaerobic bacteria group becomes latent and inactivated because it is placed under relatively aerobic conditions where contact with free oxygen may occur. Only a group of soil facultative anaerobic bacteria that produces a metabolite containing phenol or/and a compound with an exposed phenol group, or a group of bacteria consisting of the soil facultative anaerobic bacteria and soil aerobic bacteria, is activated. do. As a result, metabolites containing phenol and/or compounds with exposed phenol groups are produced due to the activity of the bacterial group, and these metabolites physicochemically react with organic matter in the wastewater, causing macromolecularization and sludge formation. At the same time, it exerts an antibacterial effect on bacterial groups other than soil bacteria. The reason why all of the above-mentioned acclimatized bacterial groups consisting of soil facultative anaerobic bacteria, soil aerobic bacteria, and soil facultative anaerobic bacteria are effective in the wastewater treatment system is that This is because both anaerobic and aerobic bacteria have metabolic circuits that function effectively in the presence of oxygen, and therefore produce metabolites containing compounds with high oxidation levels that are similar in their actions. . That is, the metabolites produced by the acclimatized facultative anaerobic bacteria and aerobic bacteria both contain phenols and/or compounds with phenol-exposed groups, organic acids, polysaccharides, and amino acids; It causes a reaction similar to that of organic matter in wastewater. However, in general, as the aerobic nature of bacteria increases, the growth rate of the bacteria increases, and at the same time, the consumption of materials required for growth also increases. As a result, in highly aerobic bacteria, accumulation of metabolites within the bacteria is difficult to proceed, and therefore it is not effective to utilize highly aerobic bacteria beyond a certain level in the wastewater treatment system. According to experimental results, a dissolved oxygen concentration (DO) in wastewater of about 0.7 ppm is the borderline between effective and ineffective, and therefore, bacterial groups that become active in a DO range of about 0.7 ppm or less are effective. . Figure 3 shows the above matters more concretely and schematically. In the lower part of Figure 3, the habitat ranges of aerobic bacteria, facultative anaerobic bacteria, and obligate anaerobic bacteria are shown in relation to DO values. The solid line part shows the optimal survival range, and the broken line part shows the survivable range. The middle row shows the relationship between the DO value and the average growth rate of the bacterial group, that is, the average growth rate of the bacterial group increases as the DO value increases. In the upper row, the relationship between the DO value and the amount of metabolites consumed by bacterial growth (B), and the DO
The relationship between the value and the amount of metabolites produced by the activity of the bacterial group (A) is shown. In the figure (A-B) DO _x is DO
The amount of effective metabolite at value x, i.e.
The amount of metabolites obtained by subtracting the amount of metabolites self-consumed by the proliferation of bacterial groups from the amount of metabolites produced at the DO value is shown. From this figure, also,
(A-B) DO _x decreases as DO value increases, DO
It has also been shown that the value reaches almost zero at around 0.7 ppm. Therefore, from this figure, it becomes clear why the bacteria that act effectively in the wastewater treatment system are facultative anaerobic bacteria and some aerobic bacteria that are activated at DO of 0.7 ppm or less. Generally speaking, if the external environment is maintained under conditions suitable for the growth and proliferation of the bacterial group, bacterial groups will actively proliferate and have active metabolic activities, resulting in the accumulation of metabolites within the bacteria. proceed.
The amount of metabolites accumulated within the bacterial cells is DO _x shown in FIG. 3 (A-B). When a group of bacteria that is actively proliferating and has progressed to accumulate metabolites inside the bacteria is placed in an environment unsuitable for the growth and proliferation of the group of bacteria, it exerts an environmental regulation function or a self-preservation function. As a result, the bacterial group stops proliferating, and at the same time the metabolic products (A-
B) Excretes DO _x from the bacterial body. Note that the change in the external environment must be rapid, and DO
The difference in change depending on the value is 0.1 ppm or more, preferably
Approximately 0.2 to 0.3 ppm is required. In general, if a group of bacteria is placed in an environment unsuitable for growth for a certain period of time and then given an optimal growth environment, it will be activated for about 30 minutes.
It takes about 30 minutes for metabolites to accumulate within the bacterial cells. Therefore, the DO conditions of the culture process, which is a component of the culture system of the wastewater treatment system that involves the proliferation of bacterial groups, must incorporate the general characteristics of bacteria described above. (Example) This invention will be explained with reference to FIG. 4. In the present invention, a mixed solution of a metabolite containing phenol and/or a compound with an exposed phenol group produced by the activity of bacterial groups in the culture system 1 and raw wastewater containing organic substances are mixed and input into the reaction step 2. There, a chemical reaction is carried out in a short period of time to convert a considerable portion of the pollutant components contained in the wastewater into a solid-liquid separable state.Then, in the concentration step 3, a mixed liquid containing a large amount of treated water and sludge-like substances is produced. At the same time, a part of the mixed solution is sent to the culture system 1 to increase the amount of metabolites produced by the activities of the bacterial group as much as possible, and to promote the excretion of the metabolites from the cells, thereby reducing the concentration of metabolites in the mixed solution. After increasing the
This is a wastewater treatment system that processes wastewater containing organic substances through physicochemical reactions. The raw wastewater can be treated by the method of the present invention, regardless of its type or concentration, as long as it is human and livestock human waste wastewater, fishery processing wastewater, agricultural processing wastewater, or any other wastewater containing organic substances. The raw wastewater is first supplied to the reaction step 2 in fixed amounts either continuously or discontinuously. In the reaction step 2, a mixed solution of phenol or/and a metabolite containing a compound with a phenol-exposed group produced in the culture system 1 and raw wastewater are simultaneously supplied from the culture system 1, and raw wastewater is supplied from the culture system 1, which has different properties. The two liquids are mixed and slowly stirred, and the reaction between the two liquids proceeds. The reaction that occurs in the reaction step 2 occurs between the metabolites of the bacterial group contained in the mixed solution sent from the culture system 1 and the soluble and insoluble organic components contained in the wastewater. By reacting, chemical or/and biological sludge is first formed, and then a lump product is formed by the coexistence of unreacted organic matter and the chemical and/or biological sludge. Aeration is not necessary for the reaction itself to proceed, and the residence time may be short. In the above reaction, phenol or/and a compound with an exposed phenol group in the metabolite acts on soluble and insoluble organic matter in wastewater, causing formation of macromolecules including polycondensation and sludge formation. The organic acids, polysaccharides, and amino acids form bridges during the formation of macromolecules, including polycondensation, and sludge, thereby allowing the reaction to proceed more rapidly and stably. Since the reaction is a physicochemical reaction, the reaction rate varies depending on the liquid temperature, but the reaction usually progresses to a considerable extent within several hours. In addition, retention for a longer period of time than necessary may cause self-digestion of bacterial groups, inactivate active bacterial groups more than necessary, and cause latent bacterial groups to become activated. Since such adverse effects may occur, it is necessary that the duration is short enough to prevent these from occurring. In addition, for reasons such as the aggregation of the above-mentioned metabolites in alkalinity, it is necessary to adjust the pH of the raw wastewater to 5.0 or more and 7.5 or less from the viewpoint of efficiency. In the concentration step 3, the mixed liquid containing the sludge-like and bulk reactants sent from the reaction step 2 is separated into treated water and a concentrated liquid, and at the same time, a part of the concentrated liquid is returned to the culture system 1. In the concentration step 3, since a part of the concentrate is returned to the culture system 1, it is not preferable to use a flocculant. or,
As the concentration device used in the concentration step 3, in addition to a forced separation type such as a drum-type vacuum concentrator, it is also possible to use a sedimentation separation tank depending on the properties of the sludge-like substance. Note that a centrifugal separator or the like that would destroy sludge-like substances and even bacterial cells should not be used in the concentration step 3. In the culture system 1, the phenolic metabolic function of the bacterial group in the mixed liquid containing the sludge-like material sent from the concentration step 3 is strengthened, and at the same time, the growth of the bacterial group that produces the metabolite is promoted, It is necessary to promote the accumulation of metabolites containing phenol and/or compounds with phenol-exposed groups within the microbial cells and their excretion from the microbial cells, thereby increasing the concentration of the metabolites in the mixed solution. Therefore, from the viewpoint of efficiency, it is desirable that the mixed liquid from the concentration step 3 has a MLSS of 5000 pp or more. In addition, the residence time in the culture system 1 is optimally 3 to 4 days,
Furthermore, if the retention period is less than 48 hours, the balance of the system cannot be maintained in the long term, resulting in decreased efficiency in the reaction process,
This results in a decrease in the separation performance of sludge-like substances, a deterioration in the quality of the treated water, and further deterioration of the culture conditions due to an increase in the amount of unreacted organic matter brought into the culture step 1. The culture system 1 is composed of an adjustment step 1-A and a culture step 1-B, and the mixed liquid containing sludge-like and lumpy reactants from the concentration step 3 is
First, it is sent to the adjustment process 1-A, and then to the culture process 1-B. The adjustment step 1-A consists of a closed container, and the liquid mixture accumulated in the closed container is cut off from contact with air. The adjustment process 1
- In A, the phenolic metabolic function of the soil facultative anaerobic bacteria group or the bacterial group consisting of soil facultative anaerobic bacteria and soil aerobic bacteria contained in the inflow mixture is soil-biased. It is significantly strengthened by coexisting with a group of anaerobic bacteria, and then the mixed solution is sent to culture step 1-B and stagnates,
Activation of the bacterial group with enhanced phenolic metabolic function is further promoted. When starting the operation of the culture system 1, soil bacteria coexisting with obligate anaerobic bacteria in the absence of free oxygen and containing soil bacteria with a pronounced phenolic metabolic function, as well as Escherichia coli, putrefactive bacteria, Adjustment step 1 using the sludge mixture in which harmful bacteria other than the soil bacterial groups have been inactivated or killed, as seed bacteria.
- It is necessary to add at least 10% of the capacity of A. Note that when a substance containing a metabolite containing phenol and/or a compound with a phenol-exposed group, such as a humic plant, is added to the culture system 1, it is not necessary to introduce a starter.
The term humus here refers to a mixture of humus and humus precursors, and the term humus precursors is a general term for process substances that convert organic matter into humus. Note that the operating conditions for the various steps described above are summarized in Table 1.

【table】

[Table] In addition, in the preliminary reaction step 4 shown in FIG. 1 and Table 1, the culture system 1 and the reaction step 2 are
This is because the activation of the bacterial group, the formation of macromolecules including polycondensation, and the formation of sludge, which are caused in
In order to improve the efficiency of the wastewater treatment system, it is desirable to install one.

[Table] (Effects of the Invention) As is clear from the above explanation, the method of the present invention is adapted to produce metabolites containing phenols and/or compounds with exposed phenol groups that live in the same wastewater treatment system. The rapid production of sludge-like substances through physicochemical reactions between metabolites produced by adapted bacterial groups and organic components in wastewater significantly improves the purification effect of wastewater. This rapid production of sludge-like substances drastically reduces the BOD concentration of wastewater, so even if the wastewater has a high BOD concentration, there is no need to dilute the wastewater as in conventional methods, and the amount of treated water does not increase. First, the miniaturization of the device has the effect of simplifying operation and management, and the overhead of water supply facilities can be reduced due to the unnecessary need for dilution. In addition, even when the BOD concentration of raw water is low, there is generally no need to add nutrients.
The reduction in residence time leads to improved processing efficiency. Furthermore, the antibacterial action of the metabolite against bacterial groups other than soil bacteria suppresses the growth of harmful bacteria such as Escherichia coli and putrefactive bacteria during the treatment process and in the separated sludge, promoting the effective use of the sludge. Inorganic ionic substances in wastewater are efficiently removed because the sludge produced in the wastewater treatment system has a chelate structure. In addition, odor components in the wastewater are also fixed by reacting with the metabolites, thereby preventing the generation of any bad odor during the treatment process.

[Brief explanation of the drawing]

Figure 1 is a diagram of the relationship between macromolecule formation and oxygen reactions, Figure 2 is a schematic diagram of PH fluctuations in sludge culture, Figure 3 is a diagram of the relationship between the living conditions of bacterial groups and the amount of metabolites produced, and Figure 4 is a diagram of the relationship between bacterial group living conditions and the amount of metabolites produced. The figures each show a basic flowchart of the treatment method of the present invention.

Claims (1)

[Scope of Claims] 1. Wastewater containing organic substances is sequentially sent to a reaction process and a concentration process, and a part of the mixed solution containing sludge-like reactants separated in the concentration process is sent via a culture system to the reaction process again. A method for treating wastewater containing organic substances that is returned to A group of soil facultative anaerobic bacteria adapted to produce a group of anaerobic bacteria and a metabolite containing a phenol or/and a compound with an exposed phenol group, or the adapted soil facultative anaerobic bacteria. This is a bacterial group that coexists with a bacterial group consisting of soil aerobic bacteria and soil aerobic bacteria, and furthermore, in the culture system, metabolites containing phenol and/or compounds with phenol-exposed groups due to the activities of the bacterial group are removed as much as possible. By increasing the amount, a metabolite containing phenol or/and a compound with a phenol-exposed group is supplied to the reaction step, and in the reaction step, the phenol or/and the compound with a phenol-exposed group fed from the culture system is supplied to the reaction step. A chemical or/and biological sludge is formed by mixing the containing metabolites with the raw wastewater, and then the chemical and/or biological sludge coexists with unreacted organic matter. A lumpy product is formed, and in the concentration step, a mixed solution containing sludge-like and lumpy reactants sent from the reaction step is concentrated and separated, and at the same time, a part of the concentrated solution is returned to the culture system. A method for treating wastewater containing organic substances. 2. Claim 1, characterized in that the adjustment step comprises a closed container, and the wastewater retained in the closed container is cut off from contact with air.
Method for treating wastewater containing organic substances as described in Section 1. 3. The method for treating wastewater containing organic substances according to claim 1, wherein the residence time of the wastewater in the conditioning step and the culturing step is 24 hours or more. 4. The method for treating wastewater containing organic substances according to claim 1, wherein the redox potential of the wastewater in the adjustment step is -350 mV or less. 5. The method for treating wastewater containing organic substances according to claim 1, wherein the hydrogen ion concentration in the wastewater in the adjustment step is 7.0 or more and 9.5 or less. 6. The method for treating wastewater containing organic substances according to claim 1, wherein the redox potential of the wastewater in the culturing step is -150 mV or more and -350 mV or less. 7. The method for treating wastewater containing organic substances according to claim 1, wherein the hydrogen ion concentration in the wastewater in the culturing step is 6.5 or more and 9.5 or less. 8. The method for treating wastewater containing organic substances according to claim 1, wherein the hydrogen ion concentration in the wastewater in the reaction step is 5.0 or more and 7.5 or less.