JP3823093B2 - Contact material unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a contact material unit in which a contact plate is formed mainly of pine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, microbial treatment using anaerobic microorganisms and aerobic microorganisms has been widely employed as a purification treatment technique for water flowing through domestic wastewater, industrial wastewater, or public water bodies.
[0003]
In such microbial treatment, in order to remove organic substances in wastewater by anaerobic microorganisms and aerobic microorganisms, it is necessary to form a filter bed for culturing them.
[0004]
When a contact material is used as the filter bed, it is necessary to consider the shape, size, material, etc. to which microorganisms easily adhere as the contact material. Conventionally, ceramic plates, synthetic resin plates, nonwoven fabrics, and the like are often used.
[0005]
For example, in Japanese Patent Application Laid-Open No. 2003-53360, porous ceramic-based particles are applied to the surface of a fiber reinforced plastic (FRP) plate bent into a bellows shape, and the fine pores of the porous ceramic-based particles and the surface Discloses a technique for growing microorganisms.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2003-53360
[Problems to be solved by the invention]
However, since the ceramic plate is expensive, the product cost is increased. In this respect, the synthetic resin plate is inexpensive and lightweight, so that it is easy to handle. However, since it is a flat plate, there is a problem that the surface porosity is poor and the microbial membrane cannot be stably fixed. In addition, the nonwoven fabric has a problem in durability and has a disadvantage of increasing running cost.
[0008]
Furthermore, as disclosed in the above-mentioned publication, a product obtained by applying porous ceramic-based particles to the surface of the FRP plate has a problem that the number of manufacturing steps increases and the product cost increases.
[0009]
In view of the above circumstances, the present invention has an object to provide a contact material unit that is low in product cost, can stably fix a microbial membrane, has excellent durability, and can reduce running costs. To do.
[0010]
[Means for Solving the Problems]
First invention for achieving the above object, disposed in contact aeration tank, the contact member unit comprising a contact plate for promoting microbial processing at the contact aeration tank, formed mainly the contact plate pinewood The contact plate is loaded with a plurality of contact frames with a set interval on a contact frame body mainly formed of pine wood, and a plurality of sewage circulation holes are formed in the contact frame body and the contact plate. A burr is formed on the inner periphery of the flow hole .
[0011]
In such a configuration, since the contact plate is mainly made of pine, it does not corrode even if left in sewage for a long time, has excellent durability and is economical. Moreover, since it has a high porosity due to the gap between the annual rings, the microbial membrane can be stably fixed, and good purification performance can be obtained. In addition, since the product can be purchased at a relatively low cost, the product cost can be reduced.
[0012]
In this case, preferably, characterized in that the upper Symbol contact frame is more disposed in the contact aeration tank.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing a treatment process of the waste water treatment apparatus.
[0014]
The wastewater treatment apparatus according to the present embodiment treats sewage (food wastewater, livestock wastewater, etc.) discharged from food factories or livestock farms. As shown in FIG. 1, the sewage that has flowed into the wastewater treatment apparatus is primarily stored in the raw water tank 1, and then flows into the first treatment tank 2 and the second treatment tank 3. A primary treatment is performed to separate things from sewage. The first-stage treated sewage is adjusted to a fixed amount in the flow rate adjusting tank 4 and then flows into the measuring tank 5, and the sewage is metered into the next processing tank by a pump operation or the like and sent by a predetermined amount.
[0015]
The sewage from the measuring tank 5 flows into the contact aeration tank, and the secondary treatment is performed. In this Embodiment, it has the 1st-3rd contact aeration tanks 6-8, and sewage flows through the 2nd contact aeration tank 7 and the 3rd contact aeration tank 8 in order from the 1st contact aeration tank 6, A secondary treatment (microbe treatment) for purification by microbial action by an aerobic microbial membrane attached to the contact material loaded in each contact aeration tank 6-8 is performed.
[0016]
The sewage after the secondary treatment separates sludge such as microbial residue in the sedimentation tank 9 to form a clear treated water. Is done. Incidentally, sludge such as microbial residue precipitated in the sedimentation tank 9 is pumped up through the sludge return pipe 13 and returned to the flow rate adjustment tank 4 for reprocessing.
[0017]
As shown in FIGS. 2 and 3, the first contact aeration tank 6 is provided with a plurality of contact material units 14. The second contact aeration tank 7 and the third contact aeration tank 8 are also provided with a plurality of contact material units 14, but the configuration is the same as that of the first contact aeration tank 6. Therefore, in the following description, only the configuration of the contact material unit 14 disposed in the first contact aeration tank 6 will be described, and the configuration of the contact material unit disposed in the other contact aeration tanks 7 and 8 will be described. Will not be described.
[0018]
As shown in FIG. 2, in the first contact aeration tank 6, four contact material units 14 are arranged at a predetermined interval to form one contact material unit group 15, and this contact material unit However, three rows are arranged at predetermined intervals. The upper surface of each contact material unit group 15 is fixed to a frame 16 constructed between the inner walls of the first contact aeration tank 6. As shown in FIG. 3, a predetermined gap is provided between the lower end of each contact material unit group 15 and the bottom surface of the first contact aeration tank 6.
[0019]
Further, an air diffuser 17 is disposed at the bottom between the contact material unit groups 15, and oxygen is supplied to the sewage stored in the first contact aeration tank 6 by the air diffused from the air diffuser 17. The At the same time, as the bubbles rise, a circulating water flow is generated in the first contact aeration tank 6 as indicated by an arrow in FIG. By this circulating water flow, sewage is purified by repeatedly contacting the aerobic microbial membrane attached to the surface of each member constituting each contact material unit 14.
[0020]
As shown in FIG. 4, each contact material unit 14 includes a contact frame 18 and a plurality of contact plates 19 accommodated in the contact frame 18 with a predetermined interval. Further, the contact frame 18 is formed by joining four plate materials 18a made of pine materials such as karamatsu using a joining member such as a nail or an adhesive. Further, the contact plate 19 is also formed of a pine material such as a color pine. Pine wood is inexpensive, hardly corroded in water, and has a high porosity in the gaps between the annual rings, so it has excellent durability and can stably fix the microbial membrane.
[0021]
Furthermore, a plurality of sewage circulation holes 20 are formed in each plate member 18a and each contact plate 19 constituting the contact frame 18. The size of each sewage circulation hole 20 and the interval between the sewage circulation holes 20 are set optimally based on the effective volume of the first contact aeration tank 6, the flow velocity of the circulating water flow, and the like. Further, the size of the sewage circulation holes 20 formed in each plate member 18a and each contact plate 19 and the interval between the sewage circulation holes 20 do not need to be unambiguous. For example, they are formed at random. May be. Moreover, as shown in FIG. 5, the burr | flash part 20a formed at the time of a process is left as it is in the inner periphery of each sewage circulation hole 20. As shown in FIG.
[0022]
Next, the operation of the present embodiment having such a configuration will be described.
The sewage that has flowed into the raw water tank 1 of the waste water treatment apparatus is the first and second treatment tanks 2 and 3 → the flow rate adjustment tank 4 → the measurement tank 5 → the first to third contact aeration tanks 6 to 8 → the precipitation tank 9 → the tertiary After being treated in a predetermined manner via the treatment tank 11 → the discharge tank 12, it is discharged.
[0023]
In each of the contact aeration tanks 6 to 8, oxygen is supplied to the sewage by diffusing from the diffusing pipe 17 disposed at the bottom, and a slow circulating water flow is generated in the sewage as indicated by an arrow in FIG. 3. To do.
[0024]
When the sewage containing dissolved oxygen slowly circulates in each contact aeration tank 6-8, the contact frame 18 constituting the plurality of contact material units 14 loaded in each contact aeration tank 6-8. And the aerobic microorganism film produced | generated on the surface of the contact plate 19 accommodated in the contact frame 18 is contacted, and underwater pollutants, such as phosphorus and nitrogen, are removed.
[0025]
Moreover, since the contact frame 18 and the contact plate 19 are formed of pine wood such as Karamatsu, the porosity due to the gap between the annual rings is high, and the microbial membrane can be stably fixed on the surface. As a result, by repeatedly bringing the sewage into contact with the microbial membrane, it is possible to remove most of the water pollutants such as phosphorus and nitrogen, and to exhibit good purification performance.
[0026]
Further, a plurality of sewage circulation holes 20 are formed in the contact frame 18 and the contact plate 19, and the burrs 20a generated during processing are left as they are on the inner periphery of each sewage circulation hole 20, so that the sewage flows as sewage. When circulating through the holes 20a, water pollutants such as phosphorus and nitrogen contained in the sewage are attached to the burr 20a and removed.
[0027]
As described above, in the present embodiment, the contact frame 18 and the contact plate 19 constituting the contact material unit 14 are formed of pine wood such as Karamatsu, so the porosity due to the gap between the ring of pine wood is high, The microorganism membrane can be stably fixed on the surface, and water pollutants such as nitrogen and phosphorus can be effectively removed. In addition, since pine is hardly corroded in water, it is excellent in durability, can be used any number of times, and the running cost can be reduced.
[0028]
Further, since the burr 20a generated at the time of processing is left as it is on the inner periphery of the sewage circulation hole 20 drilled in the contact frame 18 and the contact plate 19, the burr 20a contains phosphorus contained in the sewage. Since nitrogen and nitrogen are attached and removed, higher purification ability can be obtained.
[0029]
In addition, this invention is not restricted to embodiment mentioned above, For example, microorganisms are attached by attaching pine materials, such as a pine, to the inner wall of each processing tank 2 and 3 and each contact aeration tank 6-8, for example. It is possible to perform the processing effectively and efficiently.
[0030]
Furthermore, each plate material 18a and the contact plate 19 constituting the contact frame 18 may be formed by attaching a pine material to the surface of a plate material such as FRP.
[0031]
【The invention's effect】
As described above, according to the present invention, since the contact plate is made of pine, it can be manufactured at a low cost, and a high porosity can be obtained by the annual rings of the pine. Can be stably fixed. In addition, pine wood is difficult to corrode even if left in sewage for a long time, so it has excellent durability and can reduce running costs.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a treatment process of a wastewater treatment apparatus. FIG. 2 is a plan view of a main part of the wastewater treatment apparatus. FIG. 3 is a cross-sectional view of a main part of the wastewater treatment apparatus. 5] Enlarged view of the main part of the contact material unit [Explanation of symbols]
6-8 Contact aeration tank 14 Contact material unit 18 Contact frame body 20 Sewage circulation hole 20a Burr part

Claims (2)

In a contact material unit provided with a contact plate disposed in a contact aeration tank and promoting microbial treatment in the contact aeration tank,
The contact plate is formed mainly of pine ,
A plurality of the contact plates are loaded at set intervals on a contact frame formed mainly of pine wood,
A plurality of sewage flow holes are formed in the contact frame and the contact plate,
A contact material unit , wherein burrs are formed on the inner periphery of each of the sewage circulation holes . Contact material unit according to claim 1, wherein the contact frame is characterized in that it is more disposed in the contact aeration tank.

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