JP2018130649A - Waste water treatment agent and waste water treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste water treatment agent and a waste water treatment method which are simple and costless.SOLUTION: A waste water treatment agent according to the present invention comprises a fired inorganic body from a living body composition and bacterial flora containing anaerobic bacteria. Comprising the bacterial flora containing the anaerobic bacteria, the waste water treatment agent can effectively change pollutants contained in waste water into less-harmful substances. Additionally, comprising the fired inorganic body from the living body composition, the waste water treatment agent can adsorb and remove the substances. Thereby, the waste water treatment agent according to the present invention can purify the waste water.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wastewater treatment agent and a wastewater treatment method for treating wastewater generated from a factory or the like.

  Patent Document 1 describes a method for purifying polluted water by bringing a specific kind of bacteria into contact with the polluted water.

Japanese Patent Laying-Open No. 2015-92831

  It was difficult to select and cultivate a specific type of bacteria, and there was a problem that the cultivation required considerable cost.

  The present invention solves the above-described problems, and an object of the present invention is to provide a wastewater treatment agent and a wastewater treatment method that are simple and inexpensive.

  In order to solve the above-mentioned problems, the inventors of the present application have conducted intensive studies on bacteria suitable for a wastewater treatment agent. As a result, the present inventors have found that a bacterial flora (consortia) containing anaerobic bacteria can be easily obtained, and the pollutants contained in wastewater can be efficiently changed to less harmful substances. Further, it has been found that the wastewater treatment agent can adsorb and remove these substances by containing an inorganic fired body from the biological composition, and has completed the present invention.

  That is, the wastewater treatment agent according to the present invention is characterized by containing an inorganic fired body from a biological composition and a flora containing anaerobic bacteria.

  According to the wastewater treatment agent of the present invention, the wastewater treatment agent contains a microflora containing anaerobic bacteria, thereby efficiently changing pollutants such as organic matter contained in the wastewater into less harmful substances. Can be made. Moreover, these substances can be adsorbed and removed by containing an inorganic fired body from the biological composition.

  Here, in the wastewater treatment agent, the inorganic fired body from the biological composition may be a shell fired. According to this, the inorganic material (shell) from the biological composition contains a fine organic composition, and the organic composition is burned down by firing, and the shell is porous with fine pores. It can absorb and remove pollutants contained in wastewater efficiently.

  Moreover, the said waste-water-treatment agent WHEREIN: The inorganic substance sintered body from the said biological composition shall contain the inorganic substance sintered body from the biological composition whose baking temperature is 800-1000 degreeC. According to this, the inorganic fired body from the biological composition having a firing temperature of 800 to 1000 ° C. is a porous body (calcium carbonate) having fine pores, but part thereof is changed to quick lime (calcium oxide). To do. For this reason, quick lime melts into the wastewater, and contaminants such as fats and oils contained in the wastewater can be separated and removed, so that the wastewater can be further purified.

  Moreover, the said wastewater treatment agent WHEREIN: The inorganic baked body from the said biological composition shall contain the inorganic baked body from the biological composition whose baking temperature is 500-800 degreeC. According to this, since the inorganic material fired body from the biological composition having a firing temperature of 500 to 800 ° C. is a porous body having fine pores, it efficiently adsorbs and removes contaminants and the like contained in the wastewater. be able to.

  Moreover, the said wastewater treatment agent WHEREIN: The average particle diameter of the inorganic sintered body from the said biological composition shall be 30-150 micrometers. According to this, since the inorganic sintered body from the biological composition in this range has a large surface area, the porous body has a large adsorption area, and can efficiently adsorb and remove contaminants contained in the wastewater. In addition, since the inorganic fired body from the biological composition is not too fine, it cannot be floated in the wastewater.

  In the wastewater treatment agent, the flora containing the anaerobic bacteria may be collected from sediments or suspended matters in fields, rivers or lakes. According to this, since the sediments or suspended solids of fields, rivers or lakes contain a flora rich in anaerobic bacteria, the wastewater treatment agent efficiently removes pollutants contained in the wastewater. Although it can be changed to a less harmful substance, it can be easily obtained.

  Moreover, in the wastewater treatment agent, the flora containing the anaerobic bacteria may contain aerobic bacteria. According to this, this microflora can decompose pollutants such as organic substances contained in the wastewater on the condition that a certain amount or more of dissolved oxygen is present.

  Here, the wastewater treatment method according to the present invention uses a wastewater treatment apparatus comprising a wastewater treatment tank and a microbubble generator, and the wastewater treatment agent is introduced into the wastewater of the wastewater treatment tank, The microbubble generator generates carbon dioxide microbubbles and adjusts the pH of wastewater into which the wastewater treatment agent is charged. According to this, while the pH of wastewater becomes high with the quicklime contained in a wastewater processing agent, the carbon dioxide microbubble can lower the pH of wastewater.

  Further, a wastewater treatment method according to the present invention uses a wastewater treatment apparatus comprising a wastewater treatment tank and a microbubble generator, and the wastewater treatment agent is introduced into the wastewater of the wastewater treatment tank, The bubble generator generates carbon dioxide microbubbles, adjusts the pH of the wastewater into which the wastewater treatment agent is charged, the microbubble generator generates air or oxygen microbubbles, and the pH adjusted wastewater It is characterized by adjusting the amount of dissolved oxygen. According to this, air or oxygen microbubbles can activate aerobic bacteria contained in the wastewater treatment agent, and aerobic bacteria can decompose pollutants such as organic matter contained in the wastewater. .

  Moreover, in the wastewater treatment method, the microbubble generator can generate air microbubbles in the wastewater in the wastewater treatment tank before the wastewater treatment agent is charged. According to this, air microbubbles adsorb contaminants suspended in wastewater and float up, so that they can be recovered to remove contaminants suspended in wastewater. It becomes.

  In the wastewater treatment method, the wastewater can be wastewater generated from a food processing factory. According to this, the flora containing anaerobic bacteria can change the food-derived pollutant contained in the wastewater generated from the food processing plant into a less harmful substance, so the wastewater generated from the food processing plant Can be processed efficiently.

It is a figure which shows the image of the process of the wastewater treatment method of this invention. It is a figure which shows the neutralization speed | rate of the wastewater treatment of an Example. It is a figure which shows the dissolved oxygen increase amount of the wastewater treatment of an Example. It is a figure which shows dissolved oxygen amount transition of the wastewater treatment of an Example.

  Hereinafter, embodiments of the present invention will be described. The wastewater treatment agent of the embodiment is characterized by containing an inorganic fired body from a biological composition and a fungus (consortia) containing anaerobic bacteria. The wastewater treatment agent of the embodiment is capable of purifying the wastewater more than when the inorganic calcined body from the biological composition constituting the wastewater treatment agent or the fungus containing anaerobic bacteria is used alone. .

  An inorganic substance (biological mineral) from a biological composition is an inorganic substance derived from a living body, such as a biological skeleton and a shell of shellfish. The inorganic material fired body from the biological composition is obtained by firing the inorganic material from the biological composition. The inorganic substance from the biological composition is produced by the living body, and the biological mineral contains a fine organic composition. Accordingly, by firing the inorganic material from the biological composition, the organic composition is burned out, and the inorganic fired body from the biological composition has a porous structure in which the presence of the organic composition becomes pores. . The inorganic substance from the biological composition is baked to form a porous structure, thereby adsorbing contaminants including organic substances (oils and fats) contained in the wastewater and purifying the wastewater. In addition, the inorganic fired body from the biological composition that has adsorbed the pollutant is fired again to oxidize the adsorbed pollutant to harmless carbon dioxide, water, etc. ) Can be regenerated as being capable of adsorbing contaminants. In addition, the inorganic substance from the biological composition in the embodiment is not particularly limited, but is preferably used in terms of being able to effectively use shellfish shells discarded in large quantities as food waste. Can do. In particular, scallop shells and oyster shells with a large discard amount can be used more favorably.

  The inorganic substance from the biological composition is a porous body (calcium carbonate) having fine pores by being baked, but a part thereof is changed to quick lime (calcium oxide) depending on the calcination temperature, and the quick lime is turned into waste water. Since the contaminants such as fats and oils contained in the wastewater can be separated and removed, the wastewater treatment agent can further purify the wastewater.

  The inorganic fired body from the biological composition preferably contains an inorganic fired body from the biological composition having a firing temperature of 800 to 1000 ° C. This is because the inorganic fired body from the biological composition fired at a temperature in this range can change the surface layer portion to quick lime while leaving the porous body having fine pores at the center. If the firing temperature is less than 800 ° C., the surface layer portion of the porous body may not be changed to quick lime. On the other hand, when the firing temperature exceeds 1000 ° C., most of the porous body is changed to quick lime, and there is a possibility that the porous structure does not remain. More preferably, a calcination temperature is 820-980 degreeC, More preferably, it is 850-950 degreeC.

  The inorganic fired body from the biological composition preferably further contains an inorganic fired body from the biological composition having a firing temperature of 500 to 800 ° C. The inorganic fired body from the biological composition fired at a temperature within this range is burned down, the organic composition burns down, and the presence of the organic composition becomes pores, and the entire inorganic fired body has a porous structure. Because. When the firing temperature is less than 500 ° C., the organic composition is not burned out, and the inorganic fired body from the biological composition may not have a porous structure. On the other hand, when the firing temperature exceeds 800 ° C., the surface layer of the inorganic fired body from the biological composition may be changed to quick lime and the porous structure may be reduced. More preferably, a calcination temperature is 550-700 degreeC, More preferably, it is 600-650 degreeC.

  The average particle diameter (median diameter d50) of the inorganic fired body from the biological composition is preferably 30 to 150 μm. According to this, the inorganic fired body having a size in this range has a large surface area and a large adsorption area of the porous body, and can efficiently adsorb and remove contaminants contained in the wastewater. This is because the inorganic fired body is not too fine and does not float in the wastewater. In addition, the magnitude | size of the inorganic baking body from a biological composition can be sieved by the net sieve (JISZ8801-1) of a sieve. An inorganic fired body from a biological composition having a size of 30 to 150 μm can be sieved with a nominal size of 30 μm (400 mesh) to 150 μm (100 mesh). If the particle size of the inorganic fired body from the biological composition is less than 30 μm (400 mesh), the inorganic fired body from the biological composition may float in the waste water. On the other hand, if the particle size of the inorganic fired body from the biological composition exceeds 150 μm (100 mesh), the surface area becomes relatively small, so that the adsorption area of the porous body may not be sufficient. More preferably, the particle size is 45 μm (325 mesh) to 125 μm (115 mesh), and more preferably 53 μm (270 mesh) to 106 μm (150 mesh).

  The wastewater treatment agent of the embodiment contains a flora containing anaerobic bacteria. In addition, the bacterial flora may contain aerobic bacteria if necessary.

  Anaerobic bacteria are bacteria that do not grow or are difficult to grow in an environment where dissolved oxygen exceeds a certain level, and pollutants such as carbon compounds, nitrogen compounds, sulfur compounds, and phosphorus compounds contained in wastewater are less harmful. A substance can be changed (reduced). As the flora containing anaerobic bacteria, those containing at least one of methane bacteria, denitrifying bacteria, sulfate-reducing bacteria, actinomycetes, and butyric acid bacteria are preferable.

  An aerobic bacterium is a bacterium that grows normally in an environment where dissolved oxygen exceeds a certain level, and on the condition that oxygen is present, carbon compounds, nitrogen compounds, sulfur compounds, and phosphorus compounds contained in wastewater are removed. It can be decomposed (oxidized). An aerobic bacterium is a bacterium that is present in sediment or suspended matter in a field, river, or lake with low oxygen, but is not activated as a bacterium. Therefore, aerobic bacteria are activated by generating microbubbles containing air or oxygen with a microbubble generator, which will be described later, in wastewater to which a wastewater treatment agent (microflora used as a wastewater treatment agent) is added. It is something to be made. As the aerobic bacteria, those containing at least one of nitric acid bacteria, nitrite bacteria, sphaerotilus, acetic acid bacteria, and thiobacillus are preferable.

  Moreover, facultative anaerobes may be contained in the flora. A facultative anaerobe is an anaerobic bacterium that can be grown even in an environment with oxygen. The facultative anaerobe includes at least one of soil bacteria such as Bacillus subtilis (natto), intestinal bacteria such as lactic acid bacteria and Escherichia coli, a part of actinomycetes, and activated sludge floc-forming bacteria such as Pseudomonas and Zoglea. Those are preferred.

  As the flora used for the wastewater treatment agent, those collected from sediments or suspended matters of fields, rivers or lakes can be used. The flora collected from the sediments and suspended solids of fields, rivers and lakes is rich in anaerobic bacteria, and not active, but also contains aerobic bacteria and facultative anaerobic bacteria. It is. Particularly preferred flora are the flora collected from the lower zone of river or lake sediments, the flora collected from river or lake sediments with little water change, and downstream of rivers with high wastewater inflows. Since the flora collected from the sediment is rich in the presence of more anaerobic bacteria, it can be used more favorably. In addition, these bacterial flora can be subcultured using waste water or the like. This is because the bacterial flora can be more suitable for wastewater treatment by being subcultured.

  Next, a wastewater treatment apparatus will be described. The wastewater treatment apparatus of the embodiment includes a wastewater treatment tank and a microbubble generator.

  The wastewater treatment tank is preferably a tank made of transparent acrylic or glass that allows easy confirmation of the state of wastewater. The capacity of the wastewater treatment tank can be set from the capacity of the wastewater to be treated. One wastewater treatment tank is sufficient. This is because the wastewater treatment method of the embodiment can sequentially perform the wastewater treatment process in one tank. In addition, in order to change a tank for every process and to perform a wastewater treatment, you may provide two or more tanks of a wastewater treatment tank. Moreover, in order to raise the wastewater treatment efficiency of a wastewater treatment agent, you may provide a stirrer in a wastewater treatment tank.

  The wastewater treatment tank is provided with a microbubble generator. A microbubble generator is a device that generates microbubbles in a liquid. The microbubble is a fine bubble having a diameter of several hundreds μm or less. A system containing an infinite number of microbubbles in a liquid has a much larger bubble surface area than a system containing a single bubble with the same volume. For this reason, bubbles (microbubbles) exist stably, and the residence time of bubbles in the liquid is long. As a result, the microbubbles have characteristics such as improving the dissolution characteristics of the gas forming the microbubbles in the liquid and improving the adsorption characteristics of the impurities in the liquid to the microbubbles. The diameter of the microbubbles generated from the microbubble generator is preferably 1 to 100 μm. This is because the dissolution property of the gas forming the microbubbles into the liquid is improved. When the microbubble diameter is less than 1 μm, the load applied to the microbubble generator is large, which is not preferable from the viewpoint of energy saving. On the other hand, when it exceeds 100 μm, the dissolution property of gas is inferior, which is not preferable. More preferably, the diameter of a microbubble is 1-50 micrometers, More preferably, it is 1-30 micrometers. The microbubble generator is preferably one that can easily switch the type of gas in the microbubble. This is because, in the wastewater treatment method described later, it is suitable for switching and using a plurality of types of gases. In addition, as an example of the microbubble generator, an eco bubble (manufactured by Daiki Giken Co., Ltd. or Mizusho Co., Ltd.) can be used.

  Next, the wastewater treatment method will be described. As shown in FIG. 1, the wastewater treatment method of the embodiment includes (1) throwing wastewater into a wastewater treatment tank, (2) generating air microbubbles in the wastewater, and (3) wastewater treatment agent of the embodiment in wastewater. In the wastewater treatment method, (4) generating carbon dioxide microbubbles in the wastewater, (5) generating air or oxygen microbubbles in the wastewater, and (6) discharging the wastewater.

  (1) In the step of throwing wastewater into the wastewater treatment tank, the wastewater is thrown into the wastewater treatment tank using a pump or a water heater. In addition, an apparatus including a wastewater treatment tank can be installed in a food processing factory or the like so that the wastewater can be directly input to the wastewater treatment tank. The wastewater to be treated in the embodiment is not particularly limited, but wastewater generated from a food processing factory is suitable. Because wastewater generated from food processing plants contains carbon compounds, nitrogen compounds, phosphorus compounds, and sulfur compounds as pollutants, these can be changed to less harmful substances by the wastewater treatment agent of the embodiment. is there. Examples of food processing factories that are sources of wastewater include meat processing factories and bread processing (manufacturing) factories. In addition, the wastewater treatment agent of the embodiment is a wastewater containing wastewater generated from an industrial factory containing heavy metals and the like because the inorganic fired body from the biological composition contained in the wastewater treatment agent can adsorb heavy metals and the like. However, processing is possible.

  (2) The step of generating air microbubbles in the wastewater is suspended in the wastewater by generating air microbubbles using the microbubble generator before the wastewater treatment agent is introduced into the wastewater. It separates and removes pollutants. The air microbubbles adsorb contaminants suspended in the wastewater and float up, and by collecting them, the contaminants in the wastewater can be removed. The wastewater is subjected to the removal treatment of the pollutants in the wastewater before the wastewater treatment agent is introduced, thereby reducing the processing burden in each step of the wastewater treatment method.

  (3) The step of introducing the wastewater treatment agent of the embodiment into the wastewater is a step of introducing the wastewater treatment agent into the wastewater from which contaminants have been removed by air microbubbles. The wastewater treatment agent contains a flora and an inorganic fired body, the microflora changes pollutants such as organic substances contained in the wastewater to less harmful substances, and the inorganic fired body contains pollutants such as organic substances contained in the wastewater. To adsorb. Thereby, waste water is purified. Specifically, the anaerobic bacteria contained in the flora remove pollutants such as carbon oxides, nitrogen oxides, sulfur oxides, and phosphorous oxides contained in wastewater with less harmful carbon compounds, nitrogen compounds, and sulfur. Changes (reduces) to compounds, phosphorus compounds and the like. Waste water is purified by the reduced pollutants volatilized from the waste water and released into the atmosphere or adsorbed onto the inorganic fired body. In addition, the inorganic calcined body dissolves surface lime in the wastewater to separate and remove contaminants such as fats and oils contained in the wastewater, and the porous body of the inorganic calcined body adsorbs the pollutants contained in the wastewater. , Purify wastewater.

  (4) The step of generating carbon dioxide microbubbles in the wastewater is a step of adjusting the pH of the wastewater by generating carbon dioxide microbubbles in the wastewater charged with the wastewater treatment agent by the microbubble generator. . Thereby, it can be lowered to a pH at which it can be discharged as waste water. It is preferable to adjust the pH of the waste water to 5.8 to 8.6. If the pH of the wastewater is adjusted to less than 5.8, in addition to not satisfying the national drainage standard (pH 5.8 to 8.6), excessive carbon dioxide is required, which is not preferable in running cost. On the other hand, if the pH adjustment of the wastewater exceeds 8.6, it is not preferable because the wastewater does not satisfy the drainage standard. More preferably, the pH of the wastewater is 6.0 to 8.0. This is because the drainage standards can be reliably met. Since carbon dioxide microbubbles are generated by the microbubble generator, the carbon dioxide bubbles stay in the wastewater for a long time, the carbon dioxide dissolution characteristics are improved, and pH adjustment is easy. ing.

  In addition, by generating carbon dioxide microbubbles in the wastewater by the microbubble generator, the wastewater is agitated by the generated microbubbles. By purifying the wastewater, the purification of the wastewater (2) is promoted.

  (5) In the step of generating air or oxygen microbubbles in the wastewater, oxygen (air) microbubbles are generated by the microbubble generator in the wastewater in which the wastewater treatment agent has been added to increase the amount of oxygen contained in the wastewater. It is a process. This is because by increasing the amount of oxygen contained in the wastewater, the amount of dissolved oxygen (Do) in the wastewater can be increased, and aerobic bacteria contained in the flora of the wastewater treatment agent can be activated. It is preferable that the amount of dissolved oxygen (Do) in the wastewater is adjusted to 2 mg / L or more by oxygen microbubbles. This is because the pollutants are decomposed by the activation of the aerobic bacteria, volatilized from the wastewater, released into the atmosphere, and adsorbed onto the inorganic fired body, thereby purifying the wastewater. If the dissolved oxygen content (Do) is less than 2 mg / L, the activity of aerobic bacteria slows down, and pollutants such as carbon compounds, nitrogen compounds, sulfur compounds, and phosphorus compounds contained in wastewater are generated as volatile odors (volatile) It is because there is a possibility of doing. More preferably, the dissolved oxygen amount (Do) of the wastewater is preferably adjusted to 3 mg / L or more.

  The saturation amount of the dissolved oxygen amount (Do) varies depending on the temperature of water (waste water). And it is preferable that the ratio (dissolved oxygen rate) of the oxygen amount contained in the wastewater with respect to the saturated dissolved oxygen amount is adjusted to 80% or more. This is to prevent deterioration of the water quality of the river where the wastewater was discharged. More preferably, the dissolved oxygen ratio is preferably adjusted to 90% or more.

  (6) The step of discharging the wastewater is a step of discharging (draining) into the river on the condition that the wastewater purified as described above satisfies the drainage standard. When the wastewater does not satisfy the drainage standard, it can be used as middle water (miscellaneous water) or the wastewater treatment of the embodiment can be performed again.

  If the wastewater does not meet the drainage standards, the dissolved oxygen amount is adjusted by the above step (5) (after being adjusted) and aerobic bacteria are activated (dissolved oxygen is consumed and some dissolved oxygen amount is The cycle of activating anaerobic bacteria can be repeated. Thereby, the drainage can satisfy the drainage standard.

  Hereinafter, the present invention will be described in more detail with reference to examples. As the inorganic fired body from the biological composition, the inorganic fired bodies 1 to 4 having the average particle diameter shown in Table 1 obtained by firing the shells at the firing temperature shown in Table 1 were used. For the flora, we used river sediment collected from the Horikawa River in Naka-ku, Nagoya City. The wastewater used was the wastewater discharged from the meat processing factory in the Chubu region. Table 2 shows combinations of the waste water treatment agents of the examples and waste water to be treated. The wastewater treatment tank used was a 100 L transparent glass water tank, and the microbubble generator described in Table 3 was used.

Example 1
In Example 1, oyster shells fired at 900 ° C. and oyster shells fired at 600 ° C. were used as the inorganic fired bodies from the biological composition of the wastewater treatment agent, and a defroster was used as the microbubble generator.

  After the wastewater was put into a wastewater treatment tank, air microbubbles were generated by a defuser to remove contaminants suspended in the wastewater. Thereafter, the wastewater treatment agent 1 was added to the wastewater. After the injection, the pollutants were decomposed by anaerobic bacteria, and organic matter and pollutants were adsorbed on the inorganic fired body. In addition, quick lime on the surface layer of oyster shells fired at 900 ° C. melted into the wastewater to separate and remove contaminants such as fats and oils in the wastewater. After confirming the precipitation, carbon dioxide microbubbles were introduced by a defroster to neutralize the wastewater. The time required for the wastewater to drop to pH 8 or lower was 10 minutes. Next, oxygen microbubbles were introduced by a defuser to raise the dissolved oxygen (Do) of the wastewater and activate aerobic bacteria. The time required for the dissolved oxygen to exceed 30 mg / L was 35 minutes. It was confirmed that the wastewater was purified by component analysis. Detailed data of the wastewater treatment process of Example 1 is described in Table 4, and purified wastewater data is described in Table 5.

(Example 2)
Example 2 uses scallop shells fired at 900 ° C. and scallop shells fired at 600 ° C. as the inorganic fired body from the biological composition of the wastewater treatment agent, and the microbubble generator is S1 ′ (transparent). used.

  After the wastewater was put into a wastewater treatment tank, air microbubbles were generated by S1 ′ (transparent) to remove contaminants suspended in the wastewater. Thereafter, the wastewater treatment agent 2 was added to the wastewater. After the injection, the pollutants were decomposed by anaerobic bacteria, and organic matter and pollutants were adsorbed on the inorganic fired body. Moreover, the quick lime on the surface layer of the scallop shells fired at 900 ° C. melted into the wastewater, separating and removing contaminants such as fat and oil in the drainage. After confirming the precipitation, carbon dioxide microbubbles were introduced through S1 ′ (transparent) to neutralize the wastewater. The time required for the wastewater to drop to pH 8 or less was 7 minutes. Next, oxygen microbubbles were introduced through S1 ′ (transparent) to raise the dissolved oxygen (Do) of the wastewater and activate the aerobic bacteria. The time required for the dissolved oxygen to exceed 30 mg / L was 6 minutes. Since the diameter of the S1 ′ (transparent) microbubble is smaller than that of Example 1, it is presumed that the increase in the amount of dissolved oxygen is accelerated. It was confirmed that the wastewater was purified by component analysis. Detailed data of the wastewater treatment process of Example 2 is described in Table 6, and purified wastewater data is described in Table 7.

About these Examples, neutralization rate is described in FIG. 2, dissolved oxygen increase amount is described in FIG. 3, and dissolved oxygen amount transition is described in FIG. 2-4, it has confirmed that neutralization and the amount of dissolved oxygen could be increased in a short time by using a microbubble generator. Thereby, it can be said that the wastewater treatment method of an Example can reduce wastewater treatment cost by shortening operation time. In FIG. 3, the increase in dissolved oxygen in Example 2 (S1 ′ (transparent)) suddenly decreased at an elapsed time of 6-7 minutes because the introduction of oxygen microbubbles was completed at 7 minutes. is there.

Claims (11)

  A wastewater treatment agent comprising: a fired inorganic substance from a biological composition; and a flora containing anaerobic bacteria.   The wastewater treatment agent according to claim 1, wherein the inorganic fired body from the biological composition is obtained by firing a shell.   The wastewater treatment agent according to claim 1, wherein the inorganic fired body from the biological composition contains an inorganic fired body from the biological composition having a firing temperature of 800 to 1000 ° C.   The waste water treatment agent according to claim 3, wherein the inorganic fired body from the biological composition contains an inorganic fired body from the biological composition having a firing temperature of 500 to 800 ° C.   2. The wastewater treatment agent according to claim 1, wherein an average particle size of the inorganic fired body from the biological composition is 30 to 150 μm.   The wastewater treatment agent according to claim 1, wherein the microflora containing the anaerobic bacteria is collected from sediments or suspended solids of fields, rivers or lakes.   The wastewater treatment agent according to claim 1, wherein the flora containing the anaerobic bacteria contains aerobic bacteria. Using a wastewater treatment device equipped with a wastewater treatment tank and a microbubble generator,
The wastewater treatment agent according to claim 3 is charged into wastewater in the wastewater treatment tank,
A wastewater treatment method, wherein the microbubble generator generates carbon dioxide microbubbles and adjusts the pH of wastewater into which the wastewater treatment agent is charged. Using a wastewater treatment device equipped with a wastewater treatment tank and a microbubble generator,
The wastewater treatment agent according to claim 7 is charged into the wastewater in the wastewater treatment tank,
The microbubble generator generates carbon dioxide microbubbles, and adjusts the pH of wastewater charged with the wastewater treatment agent;
A wastewater treatment method, wherein the microbubble generator generates air or oxygen microbubbles to adjust the dissolved oxygen amount of wastewater whose pH is adjusted.   The wastewater treatment method according to claim 8, wherein the microbubble generator generates air microbubbles in the wastewater in the wastewater treatment tank before the wastewater treatment agent is charged.   The wastewater treatment method according to claim 8, wherein the wastewater is wastewater generated from a food processing factory.