JPH09187792A - Drainage treatment method and usable bacteria activating tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the activation of usability of useful bacteria by proliferating and activating spores in sludge containing spores of usable bacteria in the presence of silica and magnesium and then aerating. SOLUTION: Sludge water 2, square stone grains 3 as silica and magnesium components and sludge pellets 4 are stored in a usable bacteria activating tank 1, and a usable bacteria activating tank 1 is set in a thermostat 5. Air is diffused from the bottom section of the usable bacteria activating tank 1 by using an air diffusion pipe 6, an air diffusion pump PA, a valve 7 and a flow meter 8. The proliferation and activation of usable bacteria spores are carried out by the above arrangement. The formation of high concentration spores is accelerated by the arrangement, and the concentration of dissolved silica and magnesium is increased to accelerate the biological activities.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a useful bacterium belonging to the genus Bacillus, which is necessary for highly efficient treatment of wastewater containing BOD components, in a state in which it is activated to a state just before germination, and spores are removed. The present invention relates to a novel wastewater treatment method for supplying a large amount in a grown state to an aeration tank and the like, and an activation tank used in the method.

[0002]

2. Description of the Related Art Wastewater is currently being treated by biological treatment to produce its BOD.
It is common practice to reduce components and clean them.
However, there is a limit to this, and it is difficult to treat wastewater (sewage) containing high-concentration BOD as it is, and raw sewage or the like is usually treated for a long time of 12 to 15 days. And I have a problem of unstable processing.

In order to solve this problem, the present inventors have obtained a high concentration of useful bacterial spores obtained by adding an appropriate amount of a silica component and a magnesium component to sludge containing useful bacteria and spores or sludge containing these. We have developed a sludge containing water, and put this sludge into a biological treatment system, especially an aeration tank, and then added silica and magnesium components to develop a wastewater treatment method that can stably treat even high BOD wastewater. The bacterium useful in the present invention means an aerobic or facultatively anaerobic gram-positive bacillus that forms spores (spores), that is, a bacterium of the genus Bacillus. In particular, it is desirable that the strain is excellent in the ability to decompose starch, protein and fat.

[Problems to be Solved by the Invention]

However, even if the sludge containing the spores of this useful bacterium at a high concentration is directly added to the biological treatment process (usually an aeration tank), the germination rate is poor or there is variation to the extent that germination occurs, so that the useful bacterium. There was a tendency to not fully utilize the usefulness of. This is the same even when the sludge is returned sludge, whether it is dehydrated, dried, or fermented.

Therefore, the present inventor once accepts sludge containing spores of a useful bacterium in a high concentration in an activation tank, grows and activates the spores in the presence of silica and magnesium, and then inputs the sludge into an aeration tank. Developed technology.

[0006]

In the present invention, what is necessary for the activation of useful bacteria is the supply of silica, magnesium and oxygen. Further, if the temperature is controlled within a certain range, the growth rate becomes faster. Silica is an important substance that constitutes the cell liquor, cell membrane, and spore membrane of useful bacteria. If the amount of silica is insufficient, useful bacteria cannot grow and high concentration cannot be achieved. Further, magnesium has an action of extremely shortening the generation time (growth cycle) of this useful bacterium.

[0007] In the present invention, the term "activated" refers to a state just before germination in which bacilli are found in the spores of useful bacteria. Generally, even in the same type of bacteria, the germination temperature and the growth temperature range differ depending on the strain. When spores are given an appropriate temperature and oxygen in water, the spores change from dormant state to a state just before germination. This state is called an activated state. Then, when it is given more nutrition, it germinates and grows at a stretch. In the present invention, the activated tank is brought to a state just before this germination and sent out, and then put into the aeration tank.

Further, the term "proliferation" in the present invention means that useful bacteria in sludge (particularly returned sludge) digest nutrients in the sludge and spores with the aid of silica and magnesium. If nutrients are high, spores may germinate and sporulate in the activation tank. It also includes that spores supplied from Cristobal stone and high-concentration spore seed sludge multiply in the cycle of germination, growth, and sporulation.

Next, in the present invention, the useful bacterial spore-containing sludge means at least 10 ⁶ spores / ml of useful bacteria (aerobic or facultative anaerobic Gram-positive bacillus forming the spore (spore): Bacillus genus). It is desirable to include more than about. If the inflowing BOD is tens of thousands, 10 ⁹
It is desirable that these are included. Incidentally, this sludge may be its own returned sludge in the biological treatment process, or when the concentration of useful bacterial spores in the returned sludge is low, the sludge or the dried sludge or the fermented sludge having a high concentration obtained by another device may be used. They may be used temporarily or permanently together or alone.

The dry sludge is obtained by dehydrating sludge containing useful bacterial spores at a high concentration and further drying it for convenient storage and transportation. Fermented sludge is fermented after dehydration, and is fermented in the state of dehydrated sludge to decompose the load (carcass of protozoa) and deodorize it. If these are solidified (solidified materials such as flakes and pellets), handling becomes more convenient.

Next, the silica component referred to in the present invention is most preferably monomer silica which is stably dissolved in water,
It is not limited to this. The silica component is both a microbial cell component and a spore cell component, and the lack or deficiency of the silica component means killing or reducing useful bacteria. This silica component is, for example, a granular material of a mineral containing unstable silica artificially produced (for example, pearlite (obsidian calcined product), silica-containing molten glassy mineral, low basicity slag, and other reagents). And moldings, powder and granular material of soil (eg, corroded soil, peat moss, diatomaceous earth) enriched with soluble silica, rocks with unstable or metastable silica (eg andesite, square stone ( Cristobal stone), volcanic pumice, etc.) are added to the water to form a powder or granular material, and then the product is eluted. Further, an artificially dissolved silica solution, for example, an acid solution of slag, water glass, or the like is also preferably used. The silica concentration necessary for the present invention is about 1 to 100 ppm. If it is about 1 ppm or less, the effect of proliferating useful bacteria is inferior, and in the case of monomer silica, if it exceeds 100 ppm, spontaneous polymerization is initiated to reduce the effect. Depending on the type and amount of metal ions contained in water or the concentration of salts, polymerization may start even at about 10 ppm or 5 ppm. Therefore, more preferably 1 to 20 pp
The most preferable range is m, especially about 10 to 15 ppm.
However, it is preferable that the silica concentration be high as long as it does not cause silica polymerization (depending on the liquid property).

In the case of the present invention, the silica source may be any of these, but in the case of rocks such as Cristobal stone, it is only necessary to store the crushed products in the activation tank, so maintenance is easy. . In the case of a liquid substance, a fixed amount is added from the supply section.

On the other hand, the above-mentioned minerals and solutions also contain minerals such as magnesium, calcium, aluminum and iron, which are present as ions in water. Of these, the Mg ion plays an important role in the present invention, and the action of this ion realizes the shortening of the generation alternation time. Therefore, it suffices if Mg ions are sufficiently contained in the above-mentioned powder or granular material or molded product or silica solution, but if insufficient, a material containing a magnesium component, for example, a mineral powder or granular material such as dolomite or molded. Substances, magnesium sulfate, magnesium silicate, etc. must be added separately. The Mg ion concentration that needs to be added beyond the biological activity equilibrium is 0.1 to 50 ppm. If it is less than this, the effect of shortening the generation time of useful bacteria is small, and if it is too large, the polymerization of monomer silica is promoted. (Polymerization-gelation of silica is not preferable in terms of biological treatment because it causes particle sizing and aggregation reaction to appear). Also in the case of Mg, a solid material is easier to handle as with the silica component.

Further, the present invention requires oxygen and temperature. The useful bacterium of the present invention is an aerobic bacterium and requires a large amount of oxygen for its germination and growth. Among the useful bacteria of the present invention, the type having a starch-degrading function germinated at 5 ° C and stopped growing at 45 ° C, and the type having a proteolytic function germinated at 13 ° C and stopped growing at 62 ° C. Therefore, it is desirable to keep the temperature in a higher temperature range of about 15 to 45 ° C.

On the other hand, the wastewater to be treated by the present invention is treated water containing BOD components treated by utilizing biological activity, such as a human waste treatment plant, a sewage treatment plant, and a wastewater treatment plant by various activated sludge methods. is there. Thousands to tens of thousands of pp, such as raw manure
Even in the case of wastewater containing BOD components with a high concentration of m 3, a high concentration of useful bacteria grows and sporulates in a short time, and most of them are decomposed. Therefore, in a biological treatment facility, it is important to keep sludge containing new highly useful bacteria and to promote the metabolism of bacterial cells.

The pelletization of silica, magnesium and sludge will be described below. First, the elution survey of silica from the silica-containing material will be described. A silica-containing material containing no toxic substance, preferably a natural mineral, is immersed in water to elute the silica content, and this is utilized to promote a high concentration of useful bacteria. As an example of the silica-containing material, 500 g of Cristobal stone of 5 to 8 mm is weighed and dispensed into a 1 liter beaker. To this, 500 ml of distilled water was added and immersed, and air was diffused through an air diffuser (0.2 liter / min) for 24 hours. As a result, dissolved water containing 51 ppm of dissolved SiO ₂ was obtained. still,
When a beaker containing the same amount of Cristobal stone and water was placed in an ultrasonic thermostat (50 KHz) and eluted at 45 ° C for 10 hours, dissolved SiO ₂ was 95 ppm, sol-gel Si
A large amount of O ₂ 156 ppm was found to be eluted. Therefore, when the agitation by aeration is insufficient, ultrasonic vibration can be applied to elute the sufficiently dissolved SiO ₂ .

On the other hand, a considerable amount of microorganisms was found on the surface of cristobalite and in the elution water. This was first known by the present inventor, and it is considered that useful bacterial spores stored in the Cristobal stone cavity germinated. Cristobalite is a porous mineral containing 90 to 95% of cristobalite called metastable silica, and it has already been confirmed by scanning electron microscopy that it contains a high amount of useful bacterial spores. The existence is confirmed even in the test. That is, Cristobal stone is a material that holds the species (spores) of useful bacteria,
The above-mentioned silicic acid elution behavior revealed that Cristobal stone is a sufficient mineral supply material after germination of these useful bacterial spores, and that it contributes sufficiently to the contact material as well as promoting the enrichment of useful bacterial spores. Also, in the case of ultrasonic vibration, the fact that a large amount of gel silicic acid is contained in the eluted water is a voucher that there was a sufficient excess of silica elution, indicating that elution exceeded the stable concentration range of monomer silica. ing. However, as described above, in actual use, a sufficient amount of silica elution (2 to 50 ppm) can be obtained by the flow of air and the flow of water without applying vibration by ultrasonic waves. Cristobal stone is ideal as the silica-containing material, but other soluble silica-containing materials can be used. For example, diatomaceous earth, andesite, volcanic pumice, etc. However, these do not contain useful bacterial spores.

Next, the elution investigation of the magnesium-containing material will be described. Similarly to the above-mentioned cristobalite, when the dissolution test by aeration was similarly performed using dolomite stone as the magnesium-containing material, the dissolved Mg was 22 ppm.
Eluted. 1200ppm when ultrasonic vibration is applied
Some elution was observed. Furthermore, as a Mg supply material, 100 g of a molten dolomite tablet (trade name: Akudrit: manufactured by Akudrit Chemical Co.) was weighed,
It was taken in a 1 liter beaker, distilled water was added, and an elution test by aeration similar to the above was conducted.
An elution of 07 ppm was obtained. In case of ultrasonic vibration, 4.1
Elution of 00 ppm was observed. Therefore, to supply Mg, Mg
It was also clarified that any material with a high content can be used. In addition, Mg in the akudrit is MgC
O ₂ and about 35% to 40% as MgO is contained.

Among other materials, it was considered effective to use volcanic pumice as a bacterial landing material and an active material, and therefore, an aeration elution test was also conducted on this as in the case of silica. Tapping, dissolved silica 3.1ppm
, Dissolved CaO8.2ppm, dissolved MgO2.1ppm was observed. In case of ultrasonic vibration, 55 pp of fused silica
Elution of m, dissolved CaO (155 ppm) and dissolved MgO (28 ppm) was observed. That is, it has been clarified that these volcanic pumice stones are porous materials having extremely large voids and are easily available, and therefore can be effectively used as a bioactive material and a landing material.

On the other hand, examples of the liquid silica-containing material include a solution of slag dissolved in sulfuric acid. in this case,
When 6 g of slag was dissolved in 100 g of 1N sulfuric acid, a dissolved silica solution containing 1.73% of monomer silica was obtained. Further, this solution contains about 15% of magnesium of silica. Further, instead of the slag, a silicic acid composite crystal mineral such as CaO—SiO ₂ , 2CaO—SiO ₂ or the like called silica may be used. When magnesium is insufficient, magnesium sulfate or magnesium silicate may be added. Further, dolomite or the like may be added and dissolved when melting the slag.

(Supply of inoculum by useful bacterial sludge pellets)
To the sludge containing useful bacterial spores at a high concentration, a silica solution (2,000 ppm against sludge) was added, and a small amount of a polymeric flocculant was added to enhance cohesiveness, followed by dehydration, and edible oil or its waste oil was sludge. 2 to 5% of the above is added for granulation (extruder, slitter, etc.), followed by fermentation drying and pelletization. The obtained pellets (2.0 g) were filled in a 3 liter peaker equipped with an air diffuser, and 1.5 liters of water (general household wastewater) was added while heating to 42 ° C in a constant temperature bath (hot bath), 0.5
Aeration was performed at liter / minute, and the operation of replacing water every day was repeated. On the surface of the pellet, useful bacterial spores germinated and the behavior of diffusing into water was remarkably observed, and the pellet gradually dissolved from the surface. The test was continued for 3 months, but the pellets did not become a water-soluble substance and stably exhibited the above-mentioned behavior, which revealed that the inoculum supply was stable for a long period of time. Moreover, when the spore concentration on the sludge pellet surface was measured by the dilution culture method, it was 5 × 10 ¹⁰ to 1
The concentration was as high as × 10 ¹¹ cells / ml.

(Useful Bacterial Activation Tank) The useful bacterial activation tank is required to have the following functions for biological activation and high concentration. Supply of useful bacterial inoculum. A sludge containing a high concentration of useful bacterial spores can be treated with a silica solution (100% silica as sludge).
Up to 5,000 ppm) and a small amount of polymer flocculant, dehydrated, granulated, fermented, dried and used. Cristobal stone (crushed products, etc.) will also be one of the sources. The function of supplying dissolved silica necessary for organisms grown to high concentrations (useful bacteria, their cell liquid, cells, spore tissue
It is composed of 10% or more of silica, and the growth of useful bacteria
Silica is an essential substance for sporulation. A magnesium supply function that shortens the generation change time of organisms and accelerates the growth rate. Oxygen supply function (supplies air from a diffuser to give oxygen necessary for the growth of organisms, as well as to give vibration and flow to sludge and wastewater). Temperature control function (coil heater, temperature controller, etc.)

(Securing useful bacteria concentration by adding nutrients and
Useful bacteria activation tank capacity) Activates sludge Useful bacteria activity
When performing it in the digestion tank, the number of useful bacteria in sludge
Residual nutrients may be deficient for their growth.
Can be considered. Therefore, a small amount of sludge was added to the input sludge.
Add glucose, skim milk, starch, etc.,
By carrying out the activation treatment described above, the useful bacterial concentration is 1
0⁹-10 ¹¹Activation of useful bacteria after increasing to cells / ml
About 1/2 of the sludge in the tank is put into the aeration tank,
Useful bacterial concentration of 10⁸-10⁹Increase to pieces / ml. this
Therefore, the capacity of the useful bacterial activation tank required is aeration.
It becomes 1/50 to 1/100 of the tank capacity. Also useful bacterial activity
Effective concentration limit of treatment with a chemical tank 10⁶Fills / ml
In order to achieve this, the useful bacterial activation tank capacity is 1 / the aeration tank capacity.
If it is 500 or more, the purpose can be achieved.
Therefore, how to determine the concentration of useful bacteria in the useful bacteria activation tank
Depending on whether it is increased, the useful bacterial activation tank capacity is also determined, and
The rate of nutrient decomposition (proportional to the number of bacteria) in the air tank is also determined.
And

The above-mentioned lack of nutrients includes the following cases. Depending on the wastewater treatment facility, the nutrients in the wastewater may not match the strains in the sludge. In such a case, the following measures should be taken. For example, if there is no protein in the wastewater and denitrification is also required, it is necessary to grow the protein-degrading strain because the denitrifying ability is biased toward strains that can solubilize, decompose, and assimilate protein. . Protein nutrition is required for its growth. Also,
When it is desired to remove ammonia (a foul odor), it is necessary to grow a starch degrading strain because its function is biased toward a strain that solubilizes, decomposes, and assimilates starch with high availability of ammonia. Starch nutrition is required for its growth. By using these methods, useful bacteria can be grown in the aeration tank by influx of nutrients and donation of minerals, and stable treatment can be performed.

[0025]

Next, the present invention will be described in more detail by way of examples. Example 1 (Production test of high-spore spore sludge using useful bacteria activation tank) Useful bacteria activation tank shown in FIG. 1 (height 40 cm, diameter 10
φ) 1 inside stainless steel basket 2 with 2 liters of sludge water, 2.1 kg of square stone grains 3 and sludge pellets 4
Store 0.3 kg. The entire activation tank 1 is kept in a constant temperature tank (40
± 2 ° C) Set within 5. Reference numeral 6 is an air diffuser, PA is an air diffusion pump, reference numeral 7 is a valve, 8 is a flow meter, and 9 is a heater. The sludge was extracted at the outlet of the aerobic digestion tank. Then, the sludge was drawn out from the bottom of the activation tank 1 after keeping it for 24 hours while performing air diffusion of 500 ml / min. The useful cell spore concentration before and after the treatment was determined by the dilution culture method. In addition, SiO ₂ and M eluted in sludge water as minerals necessary for activation of useful bacteria and formation of highly concentrated spores.
The gO was measured. Table 1 shows the results. Table 1 Bacterial cell concentration Dissolved silica Dissolved Mg Before activation 5 × 10 ⁶ 12.2 ppm 8.82 ppm-1 × 10 ⁷ cells / ml After activation 5 × 10 ⁹ 29.8 ppm 19.8 ppm-1 × 10 ¹⁰ cells / ml As can be seen from Table 1, it was confirmed that the practice of the present invention promotes high-concentration spore formation and increases the concentrations of silica and Mg, which contributes to biological activation. The amount of sludge pellets was reduced to about 3% when this operation was repeated 30 times.

Example 2 (Preparation test of high-concentration spore sludge by adding liquid mineral) 60 liters of aerobic digestion tank sludge water was taken in a polyethylene water tank (100 liters), and silica solution (1N sulfuric acid 10
6g of slag dissolved in 0g, 1,800mg silica equivalent) and magnesium solution (magnesium sulfate, M
(equivalent to 600 mg of g) was added and 3 l / min of air was diffused from the bottom diffuser and kept for 24 hours, and then a sample of sludge water was collected. A comparison was made. The results are shown in Table 2. The mineral supply promoted sporulation and increased the concentration. The useful bacteria (spore) concentration was measured by dilution culture. Table 2 Bacterial cell concentration Sludge state Before activation 5 × 10 ⁶ bacilli floating were observed, sludge boundary was unclear ~ 1 × 10 ⁷ cells / ml. After the activation treatment, 5 × 10 ⁹ bacilli did not float, the sludge boundary was clear, and the thickness of spore colonies increased by 1 × 10 ¹⁰ cells / ml.

Example 3 (useful bacteria activating tank) FIG. 2 is a sectional view showing an example of a useful bacteria activating tank.
This useful bacteria activating tank 10 is a cylindrical container 11 with a bottom and a lid.
Is provided with a useful bacterial spore-containing sludge inlet 12 at the upper part and a useful bacteria-containing sludge outlet 13 near the bottom, and a net basket 14 partitioned by a stainless net is housed therein. In this net basket 14, Cristobal stone grains (5 to 50 m from the bottom)
m) and silica / spore supply layer 15 consisting of sludge pellets,
Cristobal stone grains (5-8 mm) and dolomite grains (5-5 mm)
Silica-magnesium supply layer 16 composed of 10 mm),
And an implantation layer / active layer 17 made of volcanic pumice or andesite grains (30 to 60 mm) are sequentially filled. Reference numeral 6 is an air diffuser, 18 is a temperature sensor connected to the heater controller 19, and 20 is an exhaust hole.

The spores in the returned sludge fed by the pump P1 from the sludge inlet 12 are activated by the silica / spore supply layer 15 and the silica / magnesium supply layer 16 to repeat germination-spore formation, and the spore concentration is increased. Improve. Then, it proliferates in the implantation layer / active layer 17 and becomes a state of just before germination, and is sent from the sludge discharge port 13 to the aeration tank of the biological treatment facility by the overflow or the pump P2 (in the case of the figure). Further, it is desirable that the air diffuses generate small bubbles. The useful bacteria activating tank 10 is of a batch type, and the returned sludge is retained therein for several to several tens of hours for processing. In this case, it is advisable that the pump 21 pull out the treated sludge by the timer 21 at regular intervals. Also, the pump P1
The returning sludge may be intermittently sent by detecting the sludge level in the activation tank 10 with the level sensor 22.

Example 4 (Modified Example of Useful Bacterial Activation Tank) FIG. 3 shows a modified example of the useful bacterial activation tank shown in FIG.
The activation tank 23 is for treating drawn sludge continuously, and an open container 24 is stored in place of the net basket 14 in the above example. The silica / spore supply layer 15 is filled in the gap between the main body of the tank 23 and the container 24.
A silica / magnesium supply layer 16 and a landing layer / active layer 17 are provided in the inside of the tank 4, and flow in two directions in the vertical direction is generated in the tank 23. The returned sludge is in the tank 23
It is continuously fed from the bottom of the sludge, and the useful bacterial spores in the sludge are continuously activated. The flow velocity of sludge is the activation tank 23.
The speed is such that it stays for several to several tens of hours, for example, for about 12 hours. Others are the same as the above-mentioned example.

Example 5 (Other Example of Useful Bacterial Activation Tank) FIG. 4 shows an example of an activation tank 25 in which liquid sources are used as a silica source and a magnesium source. In this example, the silica / spore supply layer 15 and the silica / magnesium supply layer 16 are used.
Is omitted, and as an alternative, a supply pipe 26, a pump P3, and a mineral water tank 27 are installed as a supply unit for supplying a fixed amount of a solution containing dissolved silica or magnesium. However, in the tank 25, a landing layer and an active layer 1
As for 7, volcanic pumice and other ore crushed products are filled.
It is more effective to use cristobalite as the implantation layer / active layer 17. Other reference numerals are the same as those in FIG.

[0031]

As described in detail above, the method of the present invention receives sludge containing spores of useful bacteria, and in the presence of silica and magnesium, further in the presence of cristobalite or high concentration spore seed sludge, This is a biological treatment method for wastewater, which incorporates a useful bacterial activation step in which useful bacterial spores are proliferated and activated and then put into an aeration tank.

Therefore, in the aeration tank of the biological treatment system, the presence of high-concentration useful bacterial spores capable of stably treating even high-BOD wastewater in the presence of silica and magnesium components becomes possible. Moreover, these spores are in a state of being activated just before germination, and when abundant oxygen and nutrients are given in the aeration tank, they germinate at a stretch and consume BOD components to grow. Then, due to the presence of the silica component and the magnesium component, they do not become filamentous or rope-like, and immediately become spores when they become oligotrophic (decrease in BOD). The spores are sent again to the activation tank together with the returned sludge, and the same cycle as above is repeated.

The useful bacteria activating tank of the present invention is equipped with a device for accommodating a mineral serving as a silica supply source or a magnesium supply source or for supplying a solution containing these in the tank, and aerating and heating. It has a simple structure provided with means. However, the sludge returned through this activation tank has the concentration of useful bacterial spores increased by 2 to 3 orders of magnitude, and is activated to a state just before germination, and when it is put into an aeration tank or the like, it immediately germinates. The BOD component having a high concentration is rapidly decomposed, which is a great effect. Moreover, since the concentration of useful bacterial spores in the activation tank is extremely high, its capacity is about 50 to 100 or 1/500 of that of the aeration tank, and it can be installed at an extremely low cost together with the simplicity of the device. is there. Further growth of spores can be achieved by using solid matter of high-concentration spore sludge and Cristobal stone particles together.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a test device including a useful bacteria activation tank used in the method of the present invention.

FIG. 2 is a cross-sectional view showing an example of a useful bacteria activation tank according to the present invention.

FIG. 3 is a cross-sectional view showing a modified example of the useful bacteria activation tank according to the present invention.

FIG. 4 is a cross-sectional view showing another example of the useful bacteria activating tank according to the present invention.

[Explanation of symbols]

 1 Useful Bacterial Activated Tank 2 Mesh Basket 3 Square Stone Grain 4 Sludge Pellets 6 Diffuser Tube 9 Heater 10 Useful Bacterial Activated Tank 12 Useful Bacterial Spore-Containing Sludge Inlet 13 13 Useful Bacterial-Containing Sludge Outlet 15 Silica / Spore Supply Layer 16 Silica・ Magnesium supply layer 17 Immobilization layer and active layer 18 Temperature sensor 19 Heater controller 23 Useful bacteria activation tank 24 Open container 25 Useful bacteria activation tank 27 Mineral water tank

Claims (5)

[Claims] 1. In the biological treatment process of waste water, the sludge containing useful bacterial spores is received, the spores are proliferated and activated in the presence of silica and magnesium, and then the sludge is introduced into an aeration tank. A wastewater treatment method characterized by incorporating steps. 2. The wastewater treatment method according to claim 1, wherein cristobalite is used as the silica source. 3. The wastewater treatment method according to claim 1, wherein a solid substance of cristobalite or high-concentration spore seed sludge is added for the growth of spores. 4. A useful bacteria activating tank characterized in that a silica elution substance and a magnesium elution substance are stored in a tank provided with a useful bacterial spore-containing sludge inlet and an activated useful bacterial spore-containing sludge outlet. . 5. A bacterial implantation material is stored in a tank provided with a sludge inlet containing useful bacterial spores and an activated sludge outlet containing useful bacterial spores, and a solution containing dissolved silica and magnesium components is supplied. A useful bacteria activating tank characterized by having a section.