JPH10314785A - Contact aeration type wastewater private sewerage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a purification capacity by enabling a contact material to be simply manufactured at low cost by a method wherein semicarbonized bamboo pieces cut to an appropriate size are used as a contact material member, and contact materials of a porous block like body of organic material which are piled up at random inside an aeration convection tank are used. SOLUTION: A contact material 10 is constituted wherein many semicarbonized bamboo pieces 15, 16 of various sizes and various shapes are thrown down at random on a luggage rack shaped contact material support rack installed at a bottom part of an aeration convection tank, and piled up unit a shape of an aggregate is along an inner sectional shape of the aeration convection tank and its thickness becomes a little shorter than a length of an aeration cylinder. Since the contact material 10 being the aggregate of the semicarbonized bamboo piece constituted thus is a porous block like body wherein, so to speak, large and small various many holes are formed vertically and horizontally, the wastewater can flow inside without being retarded. A contact aeration type wastewater private sewerage system for which such the contact material 10 is used, is high in purification capacity, and almost free from generation of excess sludge and abrasion sludge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerated sewage system in which a contact material is disposed inside an aeration convection tank, and a microorganism film formed on the surface of the contact material adsorbs and oxidatively decomposes organic matter in the waste water. It relates to a septic tank.

[0002]

2. Description of the Related Art In general, a contact aeration type sewage purification tank comprises an aeration convection tank, a contact material or a contact material unit installed in the aeration convection tank, an aeration cylinder, and an inside of the aeration cylinder from its upper end to its lower end. It includes at least a blower tube that is provided to extend, a diffuser ball connected to the lower end of the blower tube, and a blower that supplies compressed air to the blower tube. The sewage flowing into the aeration convection tank flows from the top to the bottom between the contact materials. The sewage that has reached the vicinity of the bottom surface flows into the aeration cylinder from the lower end thereof, and rises to the upper end of the aeration cylinder riding on the upward flow of aeration discharged from the diffusion balloon. The sewage that has absorbed oxygen during the ascent overflows from the upper end of the aeration cylinder. The overflowed sewage flows from top to bottom between the contact materials, and thereafter repeats the above operation. In this way, convection of the wastewater is performed in the aeration convection tank. Due to the repeated convection of the wastewater, the organic matter in the wastewater is decomposed by the microorganisms that are attached to the contact material in large amounts and are in the form of a film,
Sewage purification is performed in the aeration convection tank. It has also been widely practiced to provide a second-stage aeration convection tank to further enhance the purification capacity.

[0003] The present applicant has significantly improved the purification ability by using a contact material having a structure in which natural bamboo mesh shelves are arranged in multiple stages in an aeration convection tank, that is, a contact material having a natural bamboo multi-shelf mesh shelf structure. We developed a contact aeration type sewage treatment tank that greatly reduced excess sludge and stripped sludge, and applied for a patent. This is disclosed in Japanese Patent Application Laid-Open No. Hei 7-265892. The contact material of this natural bamboo multi-stage net shelf structure is a natural bamboo material made of an organic material that is easy to inhabit by microorganisms, and has a multi-stage net shelf structure in which a plurality of net shelves are arranged in multiple stages. However, the amount of microorganisms attached and inhabiting the contact material became extremely large. The purification capacity of the contact aeration type sewage treatment tank increases as the amount of microorganisms living in the aeration convection tank increases. Therefore, the contact material having a multi-stage net shelf structure made of natural bamboo is an excellent contact material that directly contributes to the improvement of the purification ability of the contact aeration type sewage treatment tank.

[0004] However, there is still a problem with a contact material having a multi-stage net shelf structure made of natural bamboo, which is an excellent contact material that directly contributes to the improvement of the purification capacity of the contact aeration type sewage treatment tank. That is, it takes time and effort to manufacture, the size is different, and the cross-sectional shape is rectangular, circular, elliptical, etc. And low durability compared to inorganic materials such as plastics.

[0005]

An object of the present invention is to provide a contact material which can be manufactured simply and inexpensively in accordance with the shape and size of an aeration convection tank, and which is an excellent contact material which is useful for improving purification ability. It is an object of the present invention to provide a contact aeration type sewage treatment tank having a material.

[0006]

According to the present invention, there is provided a porous block made of an organic material in which pieces of semi-carburized bamboo cut into arbitrary dimensions are used as constituent members of a contact material and these are randomly stacked and arranged inside an aeration convection tank. By using the contact material of the shape,
This is to solve the above problem. In this application, a semi-carbonized bamboo piece refers to a bamboo piece obtained by baking a natural bamboo material in a charcoal kiln and carbonizing only the surface.

[0007]

The contact material constituting member of the semi-carbonized bamboo pieces cut to an arbitrary size has a large number of fine irregularities due to bamboo fibers on the cut surface and a large number of irregularities generated by the semi-carbonization on the surface other than the cut surface. It has irregularities and cracks, and microorganisms are extremely easy to inhabit. The contact material having such a structure in which the contact material constituent members are stacked inside the aeration convection tank is an aggregate of bamboo pieces having various shapes and dimensions, that is, a porous block-like material of an organic material. The shape and size of the block-shaped body conform to the internal shape of the aeration convection tank. In addition, this block-shaped body,
A large number of relatively coarse and large holes randomly running in the vertical and horizontal directions are formed, and sewage can flow through these holes without resistance. Therefore, a contact aeration type sewage purification tank having a contact material formed by randomly stacking contact material constituent members of semi-carbonized bamboo pieces cut into arbitrary dimensions in an aeration convection tank is a large amount of contact material having a characteristic structure. By the action of the attached and growing microbial membrane, organic matter can be decomposed to such an extent that hardly any surplus sludge or exfoliated sludge is generated, and sewage can be purified to a predetermined BOD value or less.

[0008]

1 is a vertical sectional view of a contact aeration type sewage purification tank according to one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a preliminary tank, 2 denotes a first aeration / convection tank, 3 denotes a second aeration / convection tank, Is an inflow pipe provided on the wall surface of the preliminary tank 1, 5 is a first advection pipe provided on a partition wall between the preliminary tank 1 and the first aeration / convection tank 2, and 6 is a first aeration / convection tank 2 and A second advection pipe provided on the partition wall between the second aeration convection tank 3 and an outflow pipe 7 provided on the wall surface of the second aeration convection tank 3. Further, reference numeral 14 denotes an inflow tank provided before the preliminary tank 1.

In the first aeration convection tank 2, an aeration cylinder 8, a blower pipe 9 passing through the aeration cylinder 8 and extending to the lower end thereof,
A diffuser balloon 13 connected to the end of the blower tube 9 and a contact material holding shelf 11 are provided. The contact material holding shelf 11
For example, a net shelf having a structure as shown in FIG. The contact material holding shelf 11 may be a net made of plastic or metal, but a net made of natural bamboo is most preferable. This is because a net shelf made of natural bamboo can itself be a suitable contact material. The contact material holding shelf 11 is provided at a distance from the bottom of the aeration convection tank 2 so that the convection of the sewage goes smoothly.
All you need is a centimeter. The contact material 10 arranged on the contact material holding shelf 11 is a porous block-like body formed by assembling the contact material constituent members 15 or 16, and has a thickness slightly smaller than the length of the aeration cylinder 8. is there. Therefore, the aeration cylinder 8 is installed extending from the upper surface to the lower surface in the contact member 10 except for the upper end. A blower 12 supplies compressed air to the blower tube 9. The second aeration convection tank 3 is also provided with an aeration cylinder 8, a blower tube 9, a diffuser ball 13, a contact material 10, and a contact material support 11 in the same manner as the first aeration convection tank 2.

FIG. 3 shows a contact material 1 which is an aggregate of semi-carbonized bamboo pieces.
0 is partially shown. As is clear from FIG.
A large number of semi-carburized bamboo pieces 1 of various sizes and shapes
5 and 16 are dropped at random onto a net shelf-like contact material holding shelf 11 installed at the bottom of the aeration convection tanks 2 and 3 so that the shape of the aggregate is along the internal cross-sectional shape of the aeration convection tank and They are stacked until the thickness becomes slightly smaller than the length of the aeration cylinder 8. The contact material 10, which is an aggregate of semi-carbonized bamboo pieces configured in this way, is a porous block-like body in which many holes of various sizes are formed vertically and horizontally, so that the sewage stagnates inside. Can flow without. In FIG. 3, arrows indicate the direction of flow. This porous block of organic material has a very large contact area with sewage, and the semi-carburized bamboo piece itself, which is a constituent of the contact material, has a large number of irregularities on its surface. The contact material according to the invention is very suitable for microorganisms to attach and inhabit.

FIG. 4 shows an example of a semi-carburized bamboo piece as an example of the contact material constituting member 15. A dish-shaped or cup-shaped bamboo piece obtained by cutting natural bamboo into arbitrary lengths at both ends of a node is shown. It is semi-carbonized. The contact material constituent member 15 is provided with a through-hole of an arbitrary size at an appropriate place of the node. The operation of providing the through holes is easier after the bamboo pieces are semi-carbonized. The contact material constituent member is obtained by semi-carbonizing a ring-shaped or cylindrical bamboo piece obtained by cutting natural bamboo to an arbitrary length at a portion having no nodes. These contact material constituent members may be partially incomplete dish-shaped or cup-shaped or ring-shaped or cylindrical semi-carburized bamboo pieces.

Semi-carbonized bamboo pieces are made by first cutting natural bamboo to an arbitrary length, preparing a large number of dish-shaped bamboo pieces and ring-shaped bamboo pieces, and baking these materials in a charcoal kiln. . As an example, a large number of materials obtained by cutting a moss bamboo having a diameter of about 10 cm into a length of 3 to 10 cm are almost fully filled in a charcoal kiln of about 4.6 cubic meters, and 45 g
It was baked at a temperature of 0 ° C. for about 3 to 5 hours to obtain a desired piece of semi-carbonized bamboo. In the reverse procedure, for example, a natural bamboo having a length of 1 to 2 meters is first semi-carbonized at the same temperature and time in a charcoal kiln, and cut into arbitrary dimensions to obtain a semi-carbonized bamboo piece. You may do so. However, the former is much more efficient.

In FIG. 1, the contact material holding shelf 11 is a single net shelf which is substantially equal to the internal sectional shape of the aeration convection tank.
A net shelf with a net basket may be used. In this case, the shape and size of the porous block, which is an aggregate of semi-carbonized bamboo pieces, follow the shape and size of the net basket. The net basket is preferably made of bamboo. The use of a net basket is convenient when removing the semi-carbonized bamboo pieces from the contact material component from the aeration convection tank. For example, if a porous block-shaped body is formed by using a semi-carbonized bamboo piece having a large diameter as a contact material constituting member, and a space is obtained at the bottom of the aeration convection tank so as to allow a smooth flow of wastewater, the contact material The holding shelf 11 is unnecessary.

[0014]

According to the present invention, there is provided a contact aeration type sewage purifying tank using a porous block contact material made of an organic material. The organic material is a piece of semi-carburized bamboo cut into an arbitrary size, and the porous block is formed by randomly stacking these organic materials in an aeration convection tank. Semi-carbonized bamboo pieces cut to arbitrary dimensions have numerous fine irregularities due to bamboo fiber on the cut surface, and many irregularities and cracks caused by semi-carbonization on the surface other than the cut surface, This is an organic material that is very suitable for contact material components. Since the contact material having such a structure that the contact material constituent members of the organic material are randomly stacked inside the aeration convection tank is a porous block structure of the organic material,
Large amounts of microorganisms grow and attach. Therefore, the contact aeration type sewage treatment tank of the present invention using the contact material having a unique structure having such a characteristic has a very high purification ability, and the excess sludge hardly generates stripped sludge.

The contact material of the porous block of the organic material according to the present invention is constituted by randomly charging a large amount of semi-carburized bamboo pieces cut to an arbitrary size into an aeration convection tank and stacking the pieces. Because of that, fabrication is very simple. Further, since the manufactured porous block-shaped body of the organic material is adapted to the size and shape of the aeration convection tank, it is not necessary to design the shape and size of the block-shaped body in advance. Furthermore, since the material is natural bamboo, the cost of the contact material accounts for a very small proportion of the whole septic tank even if the cost of the carbonization process is taken into account. Since the contact material constituting member is not a raw bamboo piece but a semi-carbonized bamboo piece, the contact material has high durability and can be used almost semi-permanently.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an aerated sewage treatment tank according to an embodiment of the present invention.

FIG. 2 shows an embodiment of a contact material holding shelf.

FIG. 3 is a perspective view showing an embodiment of a contact material which is an aggregate of contact material constituent members.

FIG. 4 is a perspective view showing an example of a semi-carbonized bamboo piece as a contact material constituent member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reserve tank 2 1st aeration convection tank 3 2nd aeration convection tank 4 inflow pipe 5 1st advection pipe 6 2nd advection pipe 7 outflow pipe 8 aeration cylinder 9 air blow pipe 10 contact material 11 contact material holding shelf 12 Blower 14 Inflow tank 13 Balloon 15 Contact material component 16 Contact material component

Claims (2)

[Claims] The present invention is characterized in that a semi-carburized bamboo piece cut to an arbitrary size is used as a contact material constituent member, and a porous block-like body formed by randomly stacking these pieces in an aeration convection tank is used as a contact material. Contact aeration type sewage treatment tank 2. The contact aeration type sewage purification tank according to claim 1, wherein the contact material holding shelf is provided in the aeration convection tank.