JPS61220790A - Microbe-immobilizing carrier for waste water treating apparatus - Google Patents

Abstract

PURPOSE:To treat waste water rapidly by forming the main body of an immobilizing carrier with a porous body having two-dimensional or three-dimensional through-pores and reducing the diameter of the through-pores successively from the upper layer to the lower layer. CONSTITUTION:Filaments 3 having from 0.1 to several mm diameter is formed into a porous body 1 having two-dimensional or three-dimensional through-pores 2 and an immobilizing carrier main body A of specified size is formed with the porous body 1. The diameter of the through-pores are successively reduced from the upper layer to the lower layer. By using this microbe-immobilizing carrier for a waste water treating apparatus, the clogging of a filter bed by hardly decomposable suspended matter contained in waste water is prevented, opportunities of the contact with microbes are increased, fermentation is efficiently carried out and waste water is rapidly treated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to an immobilization carrier for immobilizing microorganisms, ie, anaerobic bacteria, in a wastewater treatment device.

(Prior Art and Problems to be Solved by the Invention) Anaerobic bacteria immobilized carriers are stable against shock loads and changes in pH. It has strong resistance to starvation, but can be prevented from washing out with S grade wastewater.

It has the following advantages.

By the way, conventionally, this type of immobilization carrier was manufactured by
As seen in Publication No. 764 (Figure 145), each filter bed (200) is formed by making a large amount of particle size wire rods uniform in particle size,
The filter beds (200) are stacked one on top of the other and the filter beds (20G) become denser from the upper layer to the lower layer (hereinafter referred to as the former), and the filter beds (20G) are made of porous solid such as honeycomb (hereinafter referred to as the latter).

However, in the case of the former, in which a filter bed is formed of such granular materials, during backwashing operation, fine granules with a low sedimentation rate settle in the upper layer, and coarse granules with a high sedimentation rate in the lower layer, resulting in downward flow filtration. If this is done, the fine filter bed in the upper layer becomes clogged with hard-to-decompose suspended solids, resulting in a serious problem in that the throughput efficiency is significantly reduced.

The latter method has the problem that the wastewater flows rapidly in a laminar flow within the immobilization carrier, resulting in less contact with microorganisms (bacteria) and slow progress of fermentation.

The problems that the invention aims to solve are to speed up wastewater treatment by preventing blockage of the filter bed due to persistent suspended matter contained in wastewater, increasing opportunities for contact with bacterial cells, and allowing fermentation to progress efficiently. The object of the present invention is to provide a microorganism immobilization carrier that can be used to immobilize microorganisms.

(Means for solving the problem) The technical means taken to solve the above problem is to form the immobilization carrier main body with a porous body having two-dimensional or three-dimensional continuous pores, and to The pore diameter is made smaller from the upper layer to the lower layer.
((Function)) The effect of the technical means of the present invention is to trap the suspended solids in the continuous pores whose pore diameter corresponds to the particle size of the refractory solids.

(Effects of the Invention) As described above, the immobilization carrier main body of the present invention is formed of a porous body having two-dimensional or three-dimensional continuous pores, and the diameter of the continuous pores is made smaller from the upper layer to the lower layer. It has the following advantages.

■ Difficult to decompose suspended solids can be captured sequentially in descending order of size through continuous pores with pore sizes corresponding to their particle sizes, so the upper filter bed does not become clogged and the flow of wastewater becomes turbulent. Therefore, contact with microorganisms is good and progress of 5RM is fast. Therefore, the wastewater treatment efficiency is 8.

■ Since no granules are used, there is no need to worry about dense granules accumulating in the upper layer during backwashing operations, and a constant suspended solids trapping efficiency can be maintained at all times.

Example) The present invention provides an immobilization carrier body (A) formed of a porous body (1).
The diameter of two-dimensional or three-dimensional continuous pores (2) within the layer is made smaller from the upper layer to the lower layer.

The porous body (1) is formed by forming a fin or teacher's filament (3) with a diameter of 0.1 into a form having two-dimensional or three-dimensional continuous pores (2), and is formed into a predetermined size. This constitutes the immobilization carrier body (A).

The immobilization carrier main body (Δ) is formed by dividing into several layers and stacking them in a multi-stage manner, or by integrally molding the above-mentioned several layers.

The filaments (3) forming the immobilization carrier body (A) are organic fine wires such as sponge fine wires and plastic fine wires, or inorganic 1lIIa materials such as alumina, cordierite, mullite, and ceramics.

The communicating pores (2) are channels through which the immobilization carrier main body (A) passes, and the number of communicating pores (2) is several thousand from the upper layer to the lower layer.
The holes are opened so as to gradually decrease in size from μ- to several μ■.

Thus, the immobilization carrier of the present invention captures recalcitrant suspended matter in descending order of the opening diameter from the upper W portion, and ferments the organic component by the action of bacteria. At this time, the suspended solids captured by the rise of the generated gas oscillate within the continuous pores (2).
) is relieved.

Incidentally, methane gas, inert gas, etc. collected by fermentation may be flowed inside, or the liquid may be pulsated to promote the shaking of the solids, thereby further preventing blockage.

In addition, the immobilization carrier of the present invention has a diameter of 2 μιφ on the downstream side of the carrier as shown in the figure. ! A membrane (4) having pores is placed and ready for use. In addition to this membrane, a secondary separation membrane (5) having micropores of 104 μm or less can also be used.

Although the figure shows a flat membrane type separation membrane, the shape of the membrane, its installation and method are not limited to those shown in the figure, and a tube equinox ms can also be used.

Incidentally, the immobilization carrier of the present invention can be produced by cutting an unfired linear material and then firing it, or by cutting the linear material after firing and forming several layers of a rectangular sintered body (' 100),
This is coated with slurry (101) and after removing the excess slurry (101), this is used as a production mold (10
2) Fill them individually and bake them again to form them, or if they are made of ms wire, divide them into multi-stage shapes and cast and mold them into the desired number of layers. Use methods.

Furthermore, as shown in Fig. 3, a large number of through holes (6) with a diameter of 100 μm or less may be opened in the filaments (3) forming the immobilization carrier main body (△) to expand the bacterial adhesion area. .

The through holes (6) are used to expand the bacteria adhesion area and hold bacteria at a high concentration.
3) A large number of holes are drilled over the entire area.

In addition, since the diameter of the through hole (6) is about 1μ, the minimum limit for bacteria to adhere to the inside of the through hole (6) is 1μIφ, so that the strength of the filament (3) will be significantly reduced. In order to avoid this, the maximum pore diameter is set to 100 μm, but for the purpose of substrate diffusion, holes (6) with a diameter of 1 μι or less are provided and the filaments (3)
Care may be taken to activate microorganisms (bacteria) attached to the surface.

Incidentally, in the case of this example, a porous body (1) with a porosity of 76% is formed using dense alumina filaments (3) with a diameter of 0.5 fl, and this is attached to the immobilization carrier body (A> According to an experiment in which through holes (6) with an average diameter of 10μ■φ were opened so that the porosity was 25%, 25000-m'/
The bacterial adhesion area expanded to m. According to this, the through hole (
6) It is proven that the adhesion surface area is approximately 14 times larger than that of the same immobilization carrier body (A> (bacteria adhesion surface area: 1900 m/go) without openings.

Note that this experimental example is just an example, and the diameter of the filament (3), the porosity,
The pore diameter of the through hole (6) and the porosity of the through hole (6) are not limited to the values in the above experimental example, but if the porosity exceeds 50%, the strength of the immobilization carrier body (A) will decrease significantly. This is not desirable, and any percentage is fine as long as it is less than that. In the case of this example, the diameter of the filament (3) used to form the carrier (A) is R1φ, and the porosity of the porous body using it is x(10
0x%), the diameter of the through hole (6) opened inside the filament (3) is R2φ, and the porosity thereof is y (100y%).

[Brief explanation of drawings]

The drawings show an example of the biological immobilization carrier with clear characteristics, Fig. 1 is a front view partially enlarged, Fig. 2 is a manufacturing process diagram, and Fig. 3 is a front view of another example. FIG. 4 is an enlarged view of the device in use, and FIG. 5 is a vertical cross-sectional view of a conventional example. Also in the diagram

Claims (1)

[Claims] A microorganism immobilization carrier for wastewater treatment equipment, characterized in that the immobilization carrier body is formed of a porous body having two-dimensional or three-dimensional continuous pores, and the diameter of the continuous pores decreases from the upper layer to the lower layer. .