JPS6339699A - Water treatment device equipped with microbe run-off prevention plates - Google Patents

Abstract

PURPOSE:To prevent microbes from running off by dividing a fermentation tank with microbe run-off prevention plates formed by entangling a number of filaments. CONSTITUTION:A pair of microbe run-off prevention plates 5 and 6 are installed at an introduction section 3 and a drain section 4 of a fermentation tank 1 of a water treatment device W. Between microbe run-off prevention plates 5 and 6, a fermentation treatment space 7 is formed, in which a mixture of various anaerobic bacteria such as methane bacterium and the like or microbes are enclosed. A microbe run-off prevention plate 5 installed at the introduction section 3 is of three-layer structure, and formed by piling up lower layer materials 5 having communicating pores b of small pore diameters and a small void content formed between filaments (a), intermediate layer materials 5b having communicating pores (b) of medium size pore diameters and a medium void content, and upper layer materials 5c having communicating pores (b) of large pore diameters and a rough void content. By this arrangement, microbes of a high concentration can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a water treatment device that can prevent the outflow of microorganisms, increase the concentration of microorganisms in a fermentation tank, and facilitate solid-liquid separation.

(b) Conventional technology The range of possibilities in the use of microorganisms to transform foreign substances is said to be limitless, and although its action and mechanism have not been completely elucidated, it is far superior to industrial systems. Microorganisms are used as bioreactors in a wide range of fields because of their ability to produce bioreactors.

(c) Problems to be solved by the invention However, while the use of microorganisms has many advantages, its biggest drawback is that the tissue is extremely unstable.
Compared to chemical reactions, productivity is considerably lower, and there is an upper limit to the amount of microorganisms that can be used.

Normally, microorganisms are used for only one reaction, and it is difficult to collect the microorganisms after the reaction or treatment and use them repeatedly, so it is inevitable that the microorganisms used will be lost. Dissipation of microorganisms, especially in water treatment systems that perform anaerobic fermentation using microorganisms, has a significant impact on treatment efficiency, in combination with the slow growth rate of microorganisms. Conventionally, this has been dealt with by lengthening the processing time.

The present invention provides a water treatment device that can solve problems that have hitherto been unavoidable in the field of utilizing microorganisms, particularly in the field of water treatment, such as the inability to increase the amount of microorganisms and the difficulty of repeated use. The purpose is to

(d) Means for Solving the Problems The present invention provides a water treatment device equipped with a microbial outflow prevention plate that partitions the inside of a fermentation tank by a microbial outflow prevention plate formed by intertwining a large number of linear bodies with each other. This is related to.

The present invention will be explained in detail below.

The microorganism outflow prevention plate of the present invention preferably has a wire diameter of 0.1
A planar (two-dimensional) or three-dimensional (three-dimensional) structure is created by intertwining or intersecting a large number of filaments with a diameter of several mm to several mm.
It is molded into

During such molding, a large number of holes are formed between the filaments,
A continuous pore is formed inside the microorganism outflow prevention plate that communicates with adjacent pores two-dimensionally or three-dimensionally and allows the treated water to pass therethrough.

In order to reliably partition the inside of the fermenter, the microorganism outflow prevention plate preferably has the same shape as the cross-sectional area of the internal space of the fermenter.

The thickness of the microorganism leakage prevention board depends on the type of microorganism, processing time,
It can be selected appropriately depending on the size, type, etc. of the fermenter.

Further, the microorganism outflow prevention plate can have a single layer structure made of a single plate material, but preferably can also have a multilayer structure formed by laminating at least two or more layered members in multiple stages. In addition, in the case of a multilayer structure, the optimal effect of preventing the outflow of microorganisms can be obtained by sequentially changing the pore diameter of the communicating pores of each layered member.

The filaments used for forming the microorganism outflow prevention plate are not particularly limited, and any conventionally known filaments may be used. As a specific example,
Synthetic organic thin wires such as plastic thin wires, polypropylene thin wires, polyurethane thin wires, alumina, cordierite,
Examples include inorganic fine wires such as mullite, ceramic, and glass.

In addition, the porosity of the microorganism outflow plate formed using the above-mentioned filaments and the pore diameter of the continuous pores are set to 50 to 50, respectively, in order to prevent the outflow of microorganisms without inhibiting the outflow of treated water.
Set it so that it is 80X and 0.5mm or less.

Furthermore, the internal compartment of the fermenter is divided by microorganism leakage prevention plates.
Although they can be installed at any location and in any number, they are preferably installed at the inlet and outlet of the fermentation tank, so that microorganisms are enclosed in the intermediate area formed between the two parts.

There are no particular limitations on the microorganisms to be encapsulated, and any microorganisms that can be used in conversion reactions can be employed.

Examples include various anaerobic bacteria conventionally widely used in fields such as anaerobic fermentation, or mixtures of these various microorganisms. A typical example of such anaerobes is the spherical Methanobacterium (Methanobacterium).
cterium), Tojo's macrococcus Methanosarcina (Methano5arcina), single cocci in pairs, or clusters of Methanococcus (M
ethano coccus) IfE bacteria, etc.

Although the condition of the microorganisms to be encapsulated is not particularly specified, it is preferable to use an aggregate of microorganisms grown in the form of pellets or granules with calcium phosphate as the nucleus.

With the above configuration, the water treatment device of the present invention increases the concentration of microorganisms by enclosing them between the outflow prevention plates, and makes it possible to retain the microorganisms regardless of the hydraulic retention time, resulting in highly efficient biological treatment. It becomes possible to do so.

(e) Function In the present invention, the inside of the fermentation tank is divided by microbial outflow prevention plates formed from a large number of intertwined linear shapes, so that microorganisms are prevented from outflowing by the intertwined linear striations. The amount of microorganisms in the fermenter can be dramatically increased. At this time, the striae do not have any toxicity to microorganisms.

According to the present invention, it is possible to achieve a high concentration of microorganisms in anaerobic treatment in the water treatment field, and by increasing the rate of digestion of substrates (organic substances) and the rate of production of methane gas, the treatment time can be reduced. This makes it possible to shorten the time and downsize the processing equipment. Furthermore, solid-liquid separation can be easily performed by twisting due to the action of the microorganism outflow prevention plate.

The water treatment device of the present invention can exhibit remarkable effects in treating urban sewage, various industrial wastewater, especially meat processing plants, food processing plants, fermentation plants, paper factories, etc., as well as livestock wastewater and human waste. This will greatly contribute to water treatment measures, industrial waste treatment measures, environmental conservation, etc.

(f) Effects The water treatment device according to the present invention having the above-described configuration can achieve the following effects.

■Since the inside of the fermentation tank is divided by microorganism leakage prevention plates, it is possible to prevent the microorganisms dispersed in the water bath from flowing out, increasing the amount of microorganisms in the reaction system and allowing the use of high concentrations of microorganisms. .

■It is easy to separate microorganisms and treated water after treatment.

■Anaerobic digestion temperature can be lowered.

(2) From the above effects (2) to (2), water treatment can be carried out extremely efficiently and economically.

(g) Examples Hereinafter, the present invention will be specifically explained in detail based on examples shown in the attached drawings.

[First Example] This example describes a specific configuration of a water treatment device equipped with a microorganism outflow prevention plate according to the present invention.

FIG. 1 shows the overall configuration of a water treatment device W equipped with a microorganism outflow prevention plate according to the present invention.

In the figure, 1 is a fermentation tank forming a hollow cylindrical body, and the fermentation tank 1 has an introduction part 3 in its lower part for introducing the liquid to be treated into the inside of the fermentation tank 1 by means of a liquid supply pump 2. At the same time, it has a discharge section 4 at its upper part for discharging treated water toward a gas-liquid separator (not shown).

In this water treatment device W, a pair of microorganism outflow prevention plates 5 and 6 are respectively attached to the inlet part 3 and the discharge part 4 of the fermentation tank l, and between the two microorganism outflow prevention plates 5 and 6, there is a A processing space 7 is formed, and various anaerobic bacteria such as Methanobacterium or a mixture of various microorganisms are enclosed within the fermentation processing space 7.

2 and 3 show the detailed internal structure of the microorganism outflow prevention plate 5.6, both of which have a multilayer structure.

That is, the microorganism outflow prevention plate 5 attached to the introduction part 3 has a three-layer structure, and the communicating pores formed between the filaments a are in communication with the lower layer member 5a, which has a small diameter and a small porosity. An intermediate layer member 5b having a medium pore size and a medium porosity.
and an upper layer member 5c having a large pore size and a coarse porosity are stacked in layers.

On the other hand, the microorganism outflow prevention plate 6 attached to the discharge section 4 also has a three-layer structure consisting of a lower layer member 6a, an intermediate layer member 6b, and an upper layer member 6c. Contrary to 5, the diameter and porosity of the continuous pores are
The diameter becomes smaller and smaller toward the upper layer.

With this configuration, the water treatment device according to this embodiment has the following features:
Even if the liquid to be treated passes through the fermentation tank 1, the microorganisms etc. sealed in the fermentation treatment space 7 can be effectively prevented from flowing out.
The growth of microorganisms can be promoted and fermentation processing can be performed efficiently.

In the above example, the microorganism outflow prevention plate 5 placed in the introduction section 3 prevents the discharge of microbial cells, and also captures the minute suspensions, which are reaction intermediates, to further carry out the reaction by the action of the microorganisms. It also has the role of completely decomposing it and efficiently producing methane gas.

In addition, the water treatment apparatus W shown in the above embodiment (FIGS. 1 to 3) merely shows one embodiment of the present invention, and the present invention is not limited to the configuration shown in the drawings. For example, the fermentation tank 1 may be cylindrical, prismatic, or cylindrical, and the microorganism outflow prevention plates 5 and 6 may have a single-layer structure. It can be freely selected depending on the shape etc.

[Second Example] This example describes a fermentation treatment experiment conducted using the water treatment apparatus W in the first example and its results.

Note that the present invention is not limited to the following examples.

First, Table 1 shows the properties of the microorganism outflow prevention slope used in this example. In addition, (as a dead organism), digested sludge from a sewage treatment plant was used as a starter, and after being acclimatized for one month in the artificial sewage shown in Table 2 by a medium-temperature fermentation method, it was grown in a pellet form.

Table 1 Properties of the microbial outflow prevention plate Table 2 Sewage composition (amount of components contained in sewage 1e) (Experiment 1) The microbial outflow prevention board A was attached to the water treatment equipment W shown in FIG. The sewage shown in the table was diluted twice and continuously supplied as the liquid to be treated, and anaerobic digestion was performed.

Note that the processing conditions are as shown below.

Microorganism concentration in the middle part: 40,000mg/
β Treated water supply rate 11/4 hours Residence time in tank 4 hours Treatment temperature
The amount of organic matter decomposed by 37°C anaerobic digestion was investigated by measuring total organic carbon (TOC) I in the treated water and the resulting treated water. The results are shown in FIG.

In Fig. 4, the vertical axis shows TOC (lI1g/l) and the horizontal axis shows the number of elapsed days (days). In the figure, line 11 is the water to be treated, line 1
2 shows the treated water obtained in this example. From FIG. 4, it can be seen that the TOC concentration of the treated water obtained by the present invention was low, and extremely good treatment was performed in a shorter time than in the conventional method. In addition, when anaerobic digestion was performed in the same manner as above using the microbial outflow prevention plates B, C, and D, it was found that the same excellent treatment effect as the microbial outflow prevention plate A was obtained. In addition, the amount of methane gas generated was measured, and the methane gas 9 generated by conventional anaerobic digestion (the conditions for treated water, treatment temperature, treated water supply rate, etc. are the same as in this example).
Figure 5 shows the results of the comparison.

In FIG. 5, the vertical axis shows the amount of methane gas generated (1), and the horizontal axis shows the number of days elapsed. In the figure, line 14 shows the conventional anaerobic digestion, and line 13 shows the present example.

(Experiment 2) In the same manner as in Experiment 1, the sewage shown in Table 2 was continuously supplied as the liquid to be treated, and anaerobic digestion was performed. The results are shown in FIG. Note that the processing conditions are as shown below.

Concentration of microorganisms enclosed in the middle part: 40.000mg/
1 Water supply rate to be treated 1174 hours Residence time in tank 4 hours Treatment temperature
In Figure 6 at 37℃, the vertical axis is T.
OC (mg/I), the horizontal axis indicates the number of elapsed days (days); in the figure, 15 indicates the water to be treated, and line 16 indicates the treated water obtained in this example. From FIG. 5, it can be seen that the TOC level of 4 degrees in the treated water obtained by the present invention shows a stable low TOC concentration even if the TOCa level in the water to be treated is high, and it is recognized that the treatment was carried out extremely efficiently.

(Experiment 3) In the same manner as in Experiment 1, the sewage shown in Table 2 was diluted twice and continuously supplied as water to be treated, and the anaerobic digestion concentration was changed to perform the treatment. As shown in the figure. Note that the processing conditions and the like are the same as those of implementation u111 except for the processing temperature. In the figure, 17 indicates the water to be treated, and line 18 indicates the treated water obtained in this example.

From FIG. 7, T in the treated water obtained by the treatment apparatus of the present invention
It is recognized that OC 1 degree does not change much when the anaerobic digestion temperature increases from 20 degrees Celsius to 37 degrees Celsius. In the method, the decomposition rate of organic matter decreases when the anaerobic digestion temperature falls below 30°C, so a certain processing time,
That is, it is recognized that the treatment was extremely stable compared to the case where the TOCm degree in the treated water would be higher if the residence time in the tank was the same.

From the above results, according to the water treatment device of the present invention, extremely good treated water can be stably obtained over a long period of time, and anaerobic digestion does not require a temperature of 37°C, but can be performed at a low temperature of around 25°C. One thing is clear.

[Brief explanation of drawings]

FIG. 1 is an overall explanatory diagram of a water treatment device equipped with a microorganism leak prevention plate according to the present invention, FIGS. 2 and 3 are cross-sectional explanatory diagrams of a microorganism leak prevention plate, and FIGS. 6 is a graph showing the results of anaerobic digestion in Experiment 2, and FIG. 7 is a graph showing the results of anaerobic digestion in Experiment 3. In the figure, W: Water treatment device 1: Fermentation tank 2: Liquid supply pump 32 Inlet section 4: Discharge section 5: Microorganism outflow prevention plate 6: Microorganism outflow prevention plate 7: Fermentation processing space Patent applicant Director of the Agency of Industrial Science and Technology 1 person) Sub-agent
Kenichi Matsuo Figure 1:

Claims (1)

[Claims] 1. A water treatment device equipped with a microbial outflow prevention plate that partitions the inside of a fermentation tank using a microbial outflow prevention plate formed by intertwining a large number of filaments.