JPH025920Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a contact material used in an aeration device for sewage treatment, etc.

[Conventional technology]

Figure 3a is from “Water and Wastewater” Magazine 1981, Vol 23,
No. 4, page 18 onwards, is a plan view of the contact aeration tank, and Figure b is a longitudinal sectional view thereof. In the figure, 1 is a tank body, 2 is a draft tube, 3 is an air diffuser, and 4 is a string-like contact material, which is placed between support members 5 arranged radially from the draft tube 2 in a predetermined vertical direction. They are also attached at intervals. Sewage flows into the tank 1 at a predetermined flow rate from arrow A and flows out from arrow B.

Fig. 4a is a plan view of the string-like contact material 4, and Fig. 4b is a side view thereof, in which extremely thin vinylidene chloride threads are knitted into a ring-shaped body, and this ring-shaped body is continuously formed in the form of a string. It is.

[Problem that the invention attempts to solve]

The characteristic of such a string-shaped contact material is that the ring-shaped body vibrates according to the water flow, so it has high contact efficiency with wastewater.

Since countless thin ring-shaped fibers are formed three-dimensionally, a large amount of microorganisms can be retained, and the microorganisms are firmly attached, so that rapid detachment of microorganisms does not occur.

Since it is string-shaped, it can be installed freely inside the tank, and settings suitable for the tank structure and inflow load can be made.

etc.

However, as microorganisms adhere to the fibers of the ring, the surface of the string-like contact material 4 becomes covered with a sticky substance, and eventually the whole string-like contact material 4 becomes one rod-shaped and becomes clogged. The problem was that the contact area was significantly reduced.

This invention was made with the aim of solving this problem, and aims to obtain a contact material that retains the above-mentioned characteristics of the string-like contact material 4 and does not reduce contact efficiency.

[Means for solving the problem] This invention consists of a tape-shaped sheet material in which cuts are formed alternately from both side edges toward the center at a predetermined pitch, and the ends of the cuts in the sheet material are It is composed of a rope material that is tied in a corrugated shape and is fixed, and when the rope material is stretched, the sheet material opens at each cut and forms an inclined surface with respect to the rope material. It is something.

[Effect]

Microorganisms adhere to the surface of the sheet material, and the parts that form the slope vibrate separately as the water flows, so the contact efficiency with wastewater is high, and even if the amount of microorganisms attached increases, the surface area will be reduced. Since there is almost no change in the contact efficiency, there is no decrease in contact efficiency. Furthermore, the attachment of the contact material inside the tank can be freely set depending on the load.

[Example of idea]

FIG. 1 shows an embodiment of this invention; FIG. 1A is a side view showing the state before expansion, and FIG. 1B is a side view showing the state when expanded.

In the figure, 6 is a sheet material formed of a tape-shaped nonwoven fabric, 6a and 6b are its side edges, and 7 is cuts formed alternately from both side edges 6a and 6b toward the center of the sheet material 6. 8 is a rope material made of nylon rope, etc., with cut 7
It is fixed to the sheet material 6 at a fixing portion 9 near the end thereof, and is formed into a wave shape.

The contact material 10 configured in this manner can be attached to an aeration tank shown in FIG. 3 in the same way as the conventional string-like contact material 4, even when the rope material 8 is stretched at both ends. . FIG. 1b shows this state at the time of elongation, and the sheet material 6 is cut at 7.
It opens to form a curved portion 6c and forms a surface 6d inclined with respect to the rope material 8.

Even with this shape, like the conventional string-like contact material 4, the contact material 10 installed in the tank shown in FIG. Therefore, there is no change in the contact surface of microorganisms, and stable contact efficiency can be maintained.

FIG. 2 is a sectional view showing an example in which the contact material 10 of the embodiment is used as a contact material for a rotary trickling filter bed 14. In the figure, 11a is an outer retaining wall forming the outer periphery, 11b is an inner retaining wall that accommodates the rotating device 12, 13 is a water pipe, and the contact material 10 is the retaining wall 11.
A and 11b are stretched horizontally and in multiple stages at approximately equal intervals in the circumferential direction.

The contact material 10 stretched within the filter bed 14 in this way
The sewage sprayed from the sprinkler pipe 13 to the contact material 10
It flows down the surface of the earth.

In the trickling filter bed 14 using this contact material 10, since the packing material used in the past is a block material, it is a band-like material, so cleaning or replacement work is easy, and the specific surface area and porosity are easy to clean. etc. can be constructed in the same manner.Furthermore, since the sloping surface 6d of the contact material 10 and the like move in the flowing wastewater, the contact efficiency is increased.

In addition to non-woven fabric, the sheet material 6 may include woven fabric,
Sheet-like rubber plates, plastic films, metal mesh, etc. can be used, and as the rope material, in addition to man-made fibers, ropes made of natural fibers, metal wires, etc. can be used.

[Effect of idea]

This idea consists of a ribbon-shaped sheet material in which cuts are formed alternately at a predetermined pitch from both sides toward the center.
Since this contact material is made of a rope material that is fixed to this sheet material in a wavy shape so as to connect the end portions of each of the above-mentioned cuts, it has all the characteristics of a conventional string-like contact material, and also has an eye-catching shape. Since clogging does not occur, stable contact efficiency can be maintained.

[Brief explanation of the drawing]

Fig. 1a is a side view of an embodiment of this invention, Fig. 1b is a side view showing its extended form, and Fig. 2 is an example of an embodiment in which the contact material for wastewater treatment of this embodiment is used in a trickling filter bed. A sectional view of an example, FIG. 3a is a plan view of an aeration tank that is an example of using this contact material, FIG.
Figure b is a side view thereof. 6... Ribbon-shaped sheet material, 6a, 6b... Side edges, 6c... Curved portion, 6d... Inclined surface, 7...
Cut line, 8... Rope material, 10... Contact material, 9...
...Fixed part. In addition, the same symbols in the figures are the same, respectively.
or a significant portion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A sheet material in the form of a tape having flexibility and a predetermined rigidity, in which cuts are formed alternately from both side edges toward the center at a predetermined pitch;
The sheet material is tied with a rope material which is fixed to the sheet material in a wave shape so as to connect the ends of each of the cuts, and when the rope material is stretched, the sheet material opens from each cut and the rope material A contact material for wastewater treatment that is configured to form an inclined surface against the surface. (2) For wastewater treatment according to claim 1, wherein the sheet material is woven fabric, non-woven fabric, rubber sheet, plastic film, or metal mesh board, and the rope material is natural fiber, artificial fiber, or metal wire. contact material.