JPH03114592A - Microorganism carrier - Google Patents

Abstract

PURPOSE:To form a microorganism carrier having a void ratio of 50 -90% by adding a foaming agent to a water slurry consisting of a siliceous raw material and a calcareous raw material to foam the water slurry and subsequently applying hydrothermal reaction treatment to the obtained foamed cured matter. CONSTITUTION:A water slurry compounded with a siliceous raw material and calcareous raw material is prepared and a foaming agent is added to the water slurry to foam said slurry and hydrothermal reaction treatment is applied to the obtained foamed cured matter to obtain a microorganism carrier based on a porous calcium silicate hydrate having a void ratio of 50-90%. As a pref. example of the porous calcium silicate hydrate, there are tobermorite, xonolite, a CSH gel or faujasite. When org. sewage is treated using the obtained microorganism carrier, the number of processes can be reduced to a large extent as compared with a conventional method and operation control becomes easy.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Utilization Stomach> The present invention relates to a microbial carrier suitable for use in the treatment of organic wastewater such as livestock urine wastewater, miscellaneous wastewater, and sewage by the biofilm method.

<Prior art and its problems> Organic wastewater such as livestock urine wastewater, miscellaneous wastewater, and sewage causes eutrophication that induces "blue water" and "red tide" in lakes and inland seas. Conventionally, there are various methods for treating organic wastewater, such as activated sludge method, watering hearth method, and rotating disk contact method.
The immersion hearth method is often adopted due to many aspects such as installation space, processing efficiency, and maintenance management.

In this immersion method, an aerobic hearth tank is filled with contact material, and sewage is poured into it and aerated to form a biofilm on the surface of the contact material. It is about purifying. Conventionally, gravel, plastic pieces, honeycomb tubes, and the like have been used as contact materials for supporting microorganisms in this immersion hearth method.

However, these contact materials were not necessarily suitable for microorganisms to inhabit.

In addition, the conventional immersion hearth method described above can remove organic matter, but cannot sufficiently remove nitrogen compounds, phosphoric acid, and phosphates (hereinafter referred to as phosphorus), so the treated water is discharged into a closed water system. When this happens, it causes eutrophication, causing great damage to fisheries and other industries. Therefore, when organic wastewater is treated by the immersion hearth method, it is necessary to separately perform denitrification and phosphorus removal.

Therefore, biological denitrification methods are generally used along with the immersion hearth method. In this biological denitrification method, an anaerobic hearth tank is installed after the aerobic seeds in the immersed hearth method, and NH is oxidized by nitrite bacteria and nitrate bacteria in the aerobic hearth tank.
NO--N and NO''3-N changed from Ni-N are reduced to N2 by denitrifying bacteria in an anaerobic hearth tank under anoxic conditions.
The idea is to use gas. However, in order to sufficiently perform this denitrification, NH
Knee N's No2-N.

Oxidation to No--N, that is, nitrification, must be performed sufficiently, but as the nitrification progresses, the pH decreases, so neutralization treatment with an alkaline agent in an aerobic hearth tank is required, and management and equipment There is a problem that the process becomes complicated, and the economic burden of using chemicals is also large.

Conventionally, such denitrification is followed by dephosphorization. As a method of dephosphorization, calcium salt,
There are two methods: one is to precipitate and remove phosphate as a phosphate by reaction with metal salts such as aluminum and iron, and the other is to remove phosphorus by crystallization as hydroxyapatite in an alkaline region in the presence of calcium. Separate equipment or a dephosphorization tank is required. In addition, the former sedimentation removal method generates a lot of sludge and is difficult to dewater, making treatment difficult, and the use of chemicals imposes a large economic burden. Although the amount of sludge generated and the amount of chemicals used is small, it is difficult to control the pretreatment process that creates conditions for crystallization, such as calcium concentration adjustment, pH adjustment, and decarboxylation, and the problem is that management and equipment become complicated. There is.

In any case, when treating organic wastewater, three steps are currently required: organic matter removal (soaking is the bed method), denitrification, and dephosphorization.

Here, an example of such organic wastewater treatment process is shown in the eighth section.
This will be explained with reference to the figures. As shown in the figure, organic wastewater is subjected to second-order treatment in a screen settling tank 1 and a vibrating sieve 2 to remove floating matter and sediment, and then diluted with water in a dilution tank 3, and then in an immersion furnace. Organic matter is removed in the aerobic tank 4 using the bed method, and nitrification is sufficiently performed while adjusting the pH using an alkaline agent. Next, methanol is added and stirred in a stirring tank 5, and then denitrification is performed in an anaerobic tank 6, and all organic matter is removed again in a re-aerobic tank 7, and the mixture is sent to the phosphorus process.

The dephosphorization process includes decarboxylation by adding sulfuric acid in decarboxylation tank 8,
A pretreatment process consisting of adjusting the pH by adding gypsum and slaked lime in the pH adjustment layer 9 and precipitating CaCO, etc. in the precipitation tank 10, and removing phosphorus as hydroxyapatite in the dephosphorization tank 11. The treated water that has undergone this dephosphorization process is disinfected in a disinfection tank 12 and then drained.

As described above, conventional treatment of organic wastewater required a large number of facilities and sophisticated operational management.

In view of these circumstances, the present invention is suitable for inhabiting microorganisms in a biofilm method for removing organic matter, and can easily and efficiently perform denitrification and dephosphorization in a simple process. The purpose is to provide a microbial carrier.

As a result of various studies to achieve the above-mentioned object, the present inventors have discovered that a certain composition consisting of calcium silicate hydrate is effective against living organisms in organic sewage. The present invention was completed based on the finding that membrane method treatment creates a favorable environment for microorganisms to live in, crystallizes out phosphate ions, and maintains a pH of 8, which is suitable for nitrification.

The microorganism carrier of the present invention is obtained by hydrothermal reaction treatment of a foamed cured product obtained by foaming and curing an aqueous slurry consisting of a siliceous raw material and a calcareous raw material in the presence of a foaming agent, and It is characterized by containing porous calcium silicate hydrate as a main component with a porosity of 90%.

The microorganism carrier of the present invention has fine irregularities on the surface of calcium silicate hydrate crystal or gel surface, so microorganisms are easily immobilized, biofilm formation is facilitated, and organic matter is decomposed and produced. A slightly alkaline pH that is the optimum pH for microorganisms by alleviating the pH drop caused by lower fatty acids such as lactic acid, acetic acid, and acetic acid (microbial metabolites)
Conditions 8 to 9 can be stably created and microorganisms can be supported well. In addition, this microorganism carrier also has the function of crystallizing phosphate ions in wastewater and nitrifying NH-N, for example.

The configuration of the present invention will be explained in detail below.

More specifically, the microorganism carrier according to the present invention can be produced by adding a foaming agent such as aluminum powder to a water slurry mainly composed of silicic raw materials and calcareous raw materials, and then heating the slurry with water under high temperature and high pressure. A molded product made of calcium silicate hydrate obtained by reaction treatment, or a crushed product obtained by crushing a horizontal molded product with a porosity of 50 to 90%, or a silicic raw material and a calcareous raw material. It is a granulated or molded product made of calcium silicate hydrate, which is obtained by pulverizing a water slurry whose main raw material is aqueous slurry under high temperature and high pressure after hydrothermal reaction treatment, and then granulating or molding the filter powder by inserting air bubbles into it. Porosity is 50-90%
belongs to.

Here, the calcium silicate hydrate is prepared by mixing a silicate raw material and a calcareous raw material with a predetermined CaO/SiO. Molar ratio (0.5-2.0
The required pressure and
It is obtained by curing under high temperature and high pressure. Silica raw materials include powders such as silica stone, silica sand, cristobalite, amorphous silica, silica clay, ferrosilicon dust, and white clay, and calcareous raw materials include quicklime and slaked lime. , cement and other powders. The calcium silicate hydrate thus obtained is one or more selected from the group consisting of tobermorite, xonotlite, C3l (gel, foschagite, gyrolite, hillebrandite, etc.). Among these, tobermorite, xonotlite, and CSH gel are preferred because they have a high pH buffering ability and a specific surface area of 20 to 20 b.

The microorganism carrier according to the present invention has a porosity of 50 to 90%, but when this porosity is obtained during the production of calcium silicate hydrate, a water slurry of a silicic material and a calcareous material is foamed. After adding a metal foaming agent such as aluminum powder or a foaming agent such as an AE agent as an agent, a hydrothermal reaction treatment may be performed at high temperature and high pressure. Here, the metal foaming agent generates gas through a chemical reaction, and its usage ratio varies depending on the amount of bubbles and water entrained in the slurry, but can be derived from the chemical reaction equation. Specific examples of foaming agents include resin soaps, saponins, synthetic surfactants, hydrolyzed proteins, and polymeric surfactants, which mainly introduce air bubbles physically through surfactant action. There are cases in which foam is generated simply by mixing with raw materials and stirring, and cases in which stable foam is created using a special stirring tank or foaming device, and this foam is measured by volume and mixed with raw materials. There is.

When using such a foaming agent, it is necessary to test the stability of the foam and then determine the amount to be added. In addition, when a calcium silicate hydrate with a small porosity is obtained, if it is a molded product, the porosity can be adjusted by pulverizing it and then introducing air bubbles during the granulation or molding process. In other words, an aqueous solution of a polymer resin sizing agent such as an acrylic resin emulsion is added to powdered calcium silicate hydrate, a foaming agent is added if necessary, the mixture is kneaded, and the resulting mixture is granulated using a pan pelletizer. It can be molded into a mold. As the drying method here, either natural drying or heat drying may be employed. In addition, here, as a powdered calcium silicate hydrate, a powder obtained by crushing a molded product with voids as described above may be used. If it is to be made into a body, it is best to use mold molding.

Next, a method for treating organic wastewater using the microorganism carrier according to the present invention will be explained.

By passing organic wastewater that has been subjected to primary treatment to remove floating matter and precipitates through an aerobic hearth tank filled with the microbial carrier of the present invention without dilution while aerating it, organic wastewater can be removed by the biofilm method. The removal of phosphorus, the nitrification of NH-N, and the nitrification of NH-N are performed simultaneously.
2-The treated water containing N, No;-N is introduced into an anaerobic hearth tank, a hydrogen donor such as methanol is added, and No;-N, Noney N is converted to N2 by denitrification bacteria in an aerated anaerobic state. Biological denitrification is performed by reducing nitrogen to gas.

Here, as mentioned above, the microorganism carrier filled in the aerobic hearth tank has fine irregularities on the surface of calcium silicate hydrate crystals or gel, so microorganisms are easily immobilized. A slightly alkaline pH of 8 to 8, which is the optimum pH for microorganisms, because it facilitates the formation of biofilms, and also alleviates the pH drop caused by lower fatty acids such as lactic acid, butyric acid, and acetic acid, which are decomposition products of organic matter (microbial metabolites). 9 can be stably created. Therefore, in the aerobic hearth tank of the method of the present invention, the activities of bacteria and protozoa that contribute to the decomposition of organic matter, as well as nitrite bacteria and nitrate bacteria that perform nitrification, become active, making it possible to process at high loads. Even if the organic sewage introduced has a high concentration similar to that of urine sewage from a typical pig farm, dilution is not required.

Moreover, dephosphorization in such an aerobic hearth tank is due to the following action.

The microorganism support in the aerobic hearth tank supplies Ca necessary for crystallization of calcium hydroxyapatite from the crystal or gel surface of the calcium silicate hydrate forming the support, and also improves the pH buffering capacity of the contact material. Therefore, even if the pH of the wastewater is low and its value fluctuates, it will always be approximately p) I8 ~
9, the phosphate ions in the wastewater react with Ca and crystallize on the surface of the support in the form of calcium hydroxyapatite. At this time, the pores in the microorganism carrier act to disturb the unidirectional flow of wastewater and to moderate the flow velocity on the surface of the carrier, resulting in the precipitation or growth of calcium hydroxyapatite due to phosphate ions and Ca. is promoted. In addition, this microbial carrier is a "crystal species" similar to calcium phosphate or calcium hydroxyapatite.
Although it does not contain calcium hydroxyapatite, it has adsorption ability, so it adsorbs the generated calcium hydroxyapatite at the initial stage of water flow, and after that, its surface becomes structured to be suitable for nucleation of calcium hydroxyapatite. Calcium hydroxyapatite cores are formed in microscopic voids and pores.

When microorganism carriers after treated sewage were observed using a scanning electron microscope, large amounts of microorganisms were seen to be attached and living inside the voids and on the crystal surfaces, and amorphous crystals were also observed. It was identified as calcium hydroxyapatite using a line microanalyzer).

As is clear from this, the pores and
Voids have a great effect on microbial implantation and dephosphorization, and the microorganism carrier according to the present invention has a porosity of 50 to 90.
%, preferably 60 to 80%, is desirable for microbial implantation and dephosphorization. The porosity of this microorganism carrier is 50%
If the porosity is less than 90%, the specific surface area is small, making it difficult for microorganisms to settle and the phosphorus removal rate is low. On the other hand, if the porosity exceeds 90%, sewage floats up due to introduction of sewage into the aerobic hearth tank and aeration, and the strength decreases. In addition, the pH buffering ability and the durability of the phosphorus removal effect deteriorate significantly, which is not preferable.

Further, the size of the microorganism carrier according to the present invention also greatly affects the phosphorus removal performance. If the diameter of the carrier is smaller than 0.5 mm, it will be easily clogged with SS and crystallized crystals, so it cannot be used for a long time.On the other hand, if the diameter is too large, the removal rate of Ririn will decrease due to the reduction of the contact area. Therefore, both are undesirable. Therefore, for this purpose, the microorganism carrier preferably has a size of 0.5 to 10 dragons.

Here, an example of a method for treating organic wastewater using the microorganism carrier according to the present invention is shown in FIGS. 1 and 2.

The example shown in FIG. 1 is an example in which an anaerobic hearth tank is placed next to an aerobic hearth tank. As shown in the figure, screen settling basin 1
The organic sewage that has been primarily treated with the vibrating sieve 2 is sent to an aerobic tank (aerobic hearth tank) filled with the microorganism carriers mentioned above.
3 to perform organic matter removal, dephosphorization, and nitrification. Next, the water is introduced into a stirring tank 4 and methanol or organic wastewater is added thereto, and then denitrified in an anaerobic tank (ts air shimadoko original seed 5), and drained through a re-aerobic tank 6 and a disinfection tank 7.

FIG. 2 is an example of a circulating treatment process. As shown in the figure, organic sewage that has been primarily treated in the screen settling tank 1 and vibration 11i2 is introduced into the aerobic tank 15 filled with microbial carriers through the stirring tank 13 and anaerobic tank 14, and then stirred. It is circulated to tank 13. This performs organic matter treatment, dephosphorization, and denitrification. This treated water is re-anaerobic tank 16
The water is then drained through a disinfection tank 7.

As is clear from the above, if organic wastewater is treated using the microorganism carrier according to the present invention, the number of steps can be significantly reduced compared to the conventional method, and operation management can also be facilitated.

Furthermore, the microorganism carrier according to the present invention also has the function of adsorbing heavy metals, so if heavy metals are contained in organic wastewater, they will be removed together with organic matter and phosphorus.

Furthermore, the microbial carrier used in the treatment of organic sewage can be reused as a silicate lime fertilizer and a soil improvement material, which is very economical.

A manufacturing example of a microorganism carrier and a test example showing the effects of the present invention are shown below.

(Production example of microorganism carrier) (IIcsH gel carrier silica powder 4 parts by weight, quicklime powder 2 parts by weight, slaked lime powder 1
parts by weight and 3 parts by weight of ordinary Portland cement (CaO
/S 1O2-E-Ratio = 1.5) and metallic aluminum powder 0.008! 7 parts by weight of water was added to the mixture to form a water slurry. Next, this water slurry was poured into a mold, left to stand for 4 hours, and then removed from the mold, which was crushed with a rotating brush, granulated with a pan pelletizer to a particle size of 5 to 10 particles, and then placed in an autoclave at 150°C under 5 atmospheres. The microorganism carrier was prepared by hydrothermal treatment for 10 hours. The porosity of this carrier was 70%.

(2) Tobermorite carrier: 5 parts by weight of silica powder, 2 parts by weight of quicklime powder, and 3 parts by weight of ordinary Portland cement (CaO/SiO2 molar ratio = 0
．． Seven parts of water were added to a mixture prepared by adding 0.008 parts by weight of metal aluminum powder to 8) to form a water slurry.

This water slurry was poured into a mold, left to stand for 4 hours, and then removed from the mold, which was then hydrothermally treated in an autoclave at 180° C. and under 10 atm for 10 hours. The obtained molded product was crushed using a crusher and sieved to a particle size of 5 to 10 nw to obtain a microorganism carrier. The porosity of this material was 75%.

(3) Zonotlite carrier silica powder and quicklime powder were mixed at a CaO/SiO□ molar ratio of 1.
0, and dispersed in water 10 times the weight of the solid component to form a water slurry, and then placed in an autoclave at 210°C and 20 atm with stirring.
Hydrothermally treated for hours. Acrylic resin emulsion (solid content 10%) was added 4 times by weight to the bone dry substance of the xonotlite powder obtained in this way, and after kneading, granulation molding was carried out.
The mixture was dried and solidified at 0° C. and sieved to particles with a particle size of 5 to 10 mm to obtain microorganism carriers. The porosity of this material was 73%.

(4) Tobermorite supports with various porosity In the production method shown in (2) above, various tobermorite supports are obtained by changing the addition ratio of metal aluminum powder and water as shown in Table 1. Ta.

Table 1 (Test Example 1) As shown in Figure 3, 200X packed with microorganism carrier
1st tank 101 and 200X of 150X310mm
A second tank 102 of 150 x 290 mm is supplied with the primary treated collagen wastewater, which has been subjected to solid-liquid separation and passed through a 0.3 mmφ rust vibrating sieve, in an upward flow. 500 mj from below! The performance of various microbial carriers was investigated by performing aeration at 1/min. Here, the above manufacturing example (1).

(21, (Fill each microorganism carrier produced in 31 into the first and second tanks 101 and 102, and add 10% of the primary treated water.
Test examples A-1 and 1/day were respectively tested.
They were named A-2 and A-3.

For comparison, commercially available ballast, pumice 2 limestone, and polypropylene with a particle size of 5 to 10 sides were used as carriers in place of the microorganism carrier of the present invention in Comparative Examples B to B, respectively.
1°B-2, B-3, and B-4.

These Test Examples A-1 to A-3 and Comparative Examples B-1 to B-4
After 2 to 3 months, the clarity of the treated water, p
H, BOD and T-P (total phosphorus), NHney N,
No;-N.

Each concentration of N O--N was measured four times, and the average was calculated as the second
Shown in the table.

Table 2 As shown in the results, BOD volumetric load 1.0 kg/day
The BOD removal rate of the comparative example was 77 in high-load processing.
While the removal rate was ~87%, the method of the present invention showed a high removal rate of over 95%. Further, the removal rate of phosphorus was 25% or less in the comparative example, which was hardly removed, but the method of the present invention had a high removal rate of 90% or more. Furthermore, in order to perform denitrification in the next step, organic nitrogen and NH-N
However, according to the method of the present invention, the NH-N volume load is 0.4.
Even under high load treatment of kg/day/paddle, nitrification has progressed completely, and complete denitrification is now possible in the next process.

On the other hand, in the comparative example, 10 to 30% of NH-N remains, so even if a biological membrane nitrogen step is subsequently added, this remaining NH-N will flow out as is.

(Test Example 2) Using the same experimental equipment as in Test Example 1, pig urine and aqua regia were treated with the various carriers shown in Production Example (4) to determine the porosity of the carrier; differences in purification. was tested. The other conditions were the same as in Experimental Example 1. This result is similar to the test example 2~
Table 3 shows the six averages of the four measurement results over three months.

Table 3 As shown in Table 3, when the porosity of the carrier is 50% or more, the BOD removal and phosphorus removal C effects are large and nitrification progresses sufficiently. If the surface porosity exceeds 90%, the material will flow out of the tank due to the floating phenomenon during water flow, and at the same time, the strength will decrease significantly.

From this result, the pore structure of the carrier is extremely important for increasing the contact opportunity between the contact material and organic wastewater and for allowing microorganisms to settle in the pores and voids. It is also extremely important for the crystal growth of calcium hydroxyapatite that crystallizes at the same time, and greatly contributes to the phosphorus removal effect.

Examples> Example 1 In this example, an A as shown in FIGS.
A concrete sewage treatment equipment consisting of 6 treatment chambers ~F was used. Here, A, B, and F are aerobic hearth tanks, and A and B carry microorganisms mainly composed of tobermorite with a particle size of 5 to 15 shells produced in the same manner as in Production Example (2) above. The bodies F are filled with similar tobermorite carriers having a particle size of 5 to 8 m, and aeration pipes 110 to 110C for aeration are arranged below each of them. These diffusion cylinders 110a to 110c are air distribution cylinders.
: 111 and an air pump 113 via an air adjustment valve 112. The processing tank C is a stirring tank, and methanol is supplied from the methanol tank 114. Further, D and E are anaerobic hearth tanks, the insides of which are filled with commercially available anthracite having a particle size of 5 to 10.

In such a sewage treatment apparatus, the primary treated water of pigsty sewage was treated by flowing water through the sewage inlet pipe 115 at a flow rate of 600 I/day, and the treated liquid was discharged from the discharge pipe 116. Note that the methanol addition flow rate in the treatment chamber C was 1.217 days.The treatment was carried out for about 6 months under these conditions, and the pH, transparency, BOD, and BOD of the secondary treated water and discharged treated water at this time were 33.
TP and TN (total nitrogen) were measured respectively. The results are shown in FIG. As is clear from the figure, according to this example, organic matter, phosphorus, and nitrogen in the pigsty wastewater are reliably removed over a long period of time.

Example 2 In this example, a concrete sewage treatment apparatus consisting of six treatment chambers GL as shown in FIG. 6 was used. Here, T and J are aerobic hearth tanks, and these tanks are filled with a carrier whose main structure is tobermorite with a grain size of 5 to 10 shells, which was produced in the same manner as in Production Example (2) above. At the same time, there is an aeration pipe 120a below it for aeration.
, 120b are arranged. These diffuser cylinders 120a,
120b is air distribution '1121 and air adjustment valve 1
It is connected to the air pump 123 via 22. On the other hand, treatment tanks G and H are filled with commercially available anthracite, which is an anaerobic raw material, and has a particle size of 5 to 15 sides. Waste water is introduced from the waste water introduction pipe 125, and methanol is supplied from the methanol tank 124. It is now possible to do so. The wastewater that has passed through these G and H is I.

After being treated in the aerobic tank J, the water is circulated from the treatment tank to the G treatment tank via a circulating water introduction pipe 127 and a flow pump 128. Furthermore, a re-anaerobic tank is provided after K, and this tank is filled with anthracite similar to G and H.

In such a sewage treatment equipment, the sewage inlet pipe 125 passes the primary treated water of pigsty sewage at a flow rate of 600 e/day, and the circulation from K to G is 5400 e/day, and furthermore, the sewage in the sewage is Because the nitrogen concentration was high, the BOD source in the wastewater alone was insufficient to provide a pre-denitrification effect, so methanol as a hydrogen donor was supplied to the anaerobic tank G at a rate of 0.2J/day.

In this way, the wastewater was treated for about 6 months, and the pH, transparency, BOD, and BOD of the primary treated water and the treated liquid discharged from the treated discharge pipe 126 at the time of B were 33. T-P and T-N
were measured respectively. The results are shown in FIG. As is clear from the figure, according to this example, organic matter, phosphorus, and nitrogen in the pigsty wastewater are reliably removed over a long period of time.

Here, the results of Examples 1 and 2 will be considered in more detail.

As shown in FIGS. 5 and 7, in Example 1.2, purification progressed from about 4 weeks after the wastewater was introduced, and the quality of the treated water was stable from the 8th week onward. Here, Example 1
Table 4 shows the average of the water quality measurement results of the treated water after the 8th week of 2.

Table 4 As shown in Table 4, in both Examples 1 and 2, BOD, SS
Of course, high removal rates were also shown for TP and TH, resulting in extremely high-quality treatment results.

Regarding heavy metals, the inflow sewage and discharged treated water at the 200th week in Example 1 were measured, and the results are shown in Table 5.

As shown in Table 5, more than 90% of the heavy metals copper and zinc contained in the pigsty wastewater were removed by the treatment of this example.

<Effects of the Invention> As explained above, the microorganism carrier according to the present invention allows microorganisms to live well in the treatment of organic wastewater by the biofilm method, and moreover, This has the effect that dephosphorization can be easily and efficiently performed through a simple process.

Therefore, by using a microbial carrier, organic matter, nitrogen, and phosphorus can be removed efficiently, maintenance is easy, and even high-concentration wastewater such as livestock urine wastewater treatment and industrial wastewater can be treated with high loads. This has the effect that the processing equipment can be downsized and simplified. Moreover, in this case, heavy metals such as copper, zinc, and lead can also be removed at the same time. Furthermore, microbial carriers whose treatment capacity has decreased due to long-term use can be reused as silicate lime fertilizer and soil improvement material, so it is legal.

[Brief explanation of drawings]

Figures 1 to 7 are related to the present invention, Figures 1 and 2 are process diagrams showing an example of a method for treating organic wastewater, Figure 3 is an explanatory diagram showing the apparatus used in the test example, Figure 4 is an explanatory diagram showing the sewage treatment equipment used in the first example, Figure 5 is an explanatory diagram showing the results of the first example, and Figure 6 is an explanatory diagram showing the sewage treatment equipment used in the second example. FIG. 7 is an explanatory diagram showing the results of the second example, and FIG. 8 is a process chart showing the organic wastewater treatment process according to the prior art. In the drawing, 3.15 is an aerobic hearth tank, and 5.14 is an aerobic hearth tank. Patent applicant: Onoda NLC Co., Ltd. Agent

Claims (2)

[Claims] (1) Hydrothermal reaction treatment of a foamed cured product obtained by foaming and curing an aqueous slurry consisting of a siliceous raw material and a calcareous raw material in the presence of a foaming agent, and with a porosity of 50 to 90%. A microorganism carrier characterized in that the main component is porous calcium silicate hydrate. (2) Porous calcium silicate hydrate is tobermorite,
The microorganism carrier according to claim 1, which is one or more selected from the group of xonotlite, CSH gel, fossagite, gyrolite, and hireplandite.