JP2004283771A - Contact material unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact material capable of stably fixing a microbial membrane on a surface thereof, and having excellent durability. <P>SOLUTION: In the contact material unit, a plurality of contact plates 19 and a contact frame body 18 for housing the contact plates 19 are formed by pinewood such as larch. Since the contact plates 19 and contact frame body 18 are formed by pinewood, they are excellent in durability and economical without corrosion even left in dirty water for a long time period. Since the pinewood has a high porosity due to the clearance between annular rings, the microbial membrane can stably be fixed on the surface thereof. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD 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]
BACKGROUND ART Conventionally, microorganism treatment using anaerobic microorganisms and aerobic microorganisms has been often employed as a purification treatment technology for domestic wastewater, industrial wastewater, or water flowing in public water bodies.
[0003]
In such microbial treatment, in order to remove organic matter 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 a filter bed, it is necessary to consider a shape, a size, a material, and the like to which microorganisms easily adhere, and a ceramic plate, a synthetic resin plate, a nonwoven fabric, and the like are conventionally used in many cases.
[0005]
For example, Japanese Patent Application Laid-Open No. 2003-53360 discloses that a porous ceramic-based particle is applied to the surface of a fiber-reinforced plastic (FRP) plate bent and formed in a bellows shape, and the fine pores and the surface of the porous ceramic-based particle are coated. Discloses a technique for growing microorganisms.
[0006]
[Patent Document 1]
JP 2003-53360 A
[Problems to be solved by the invention]
However, since the ceramic plate is expensive, the product cost increases. In this respect, the synthetic resin plate is inexpensive and lightweight, so that it is easy to handle, but since it is a flat plate, there is a problem that the porosity of the surface is poor and the microorganism membrane cannot be stably fixed. In addition, the nonwoven fabric has a problem in durability and has a disadvantage of increasing running cost.
[0008]
Further, as disclosed in the above-mentioned publication, the one in which the porous ceramic particles are applied to the surface of the FRP plate has a problem that the number of manufacturing steps is increased and the product cost is increased.
[0009]
In view of the above circumstances, an object of the present invention is 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 cost. I do.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is a contact material unit including a contact plate disposed in a contact aeration tank and promoting the treatment of microorganisms in the contact aeration tank, wherein the contact plate is formed mainly of pine. It is characterized by having done.
[0011]
In such a configuration, since the contact plate is formed mainly of pine wood, it does not corrode even when left in sewage for a long time, is excellent in durability, and is economical. In addition, since the porosity is higher due to the gap between the annual rings, the microorganism membrane can be stably fixed, and good purification performance can be obtained. In addition, since it can be purchased relatively inexpensively, it is possible to reduce the product cost.
[0012]
In this case, preferably, 1) a plurality of the contact plates are mounted on a contact frame formed mainly of pine wood at a predetermined interval.
2) The contact frame is provided in a plurality in the contact aeration tank.
3) A plurality of sewage flow holes are formed in the contact frame and the contact plate.
4) A burr is formed on the inner periphery of each of the sewage flow holes.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing the processing steps of the wastewater treatment apparatus.
[0014]
The wastewater treatment apparatus according to the present embodiment targets sewage (food wastewater, livestock wastewater, etc.) discharged from a food factory, livestock farm, or the like. As shown in FIG. 1, the sewage flowing into the wastewater treatment device is primarily stored in a raw water tank 1 and then flows into a first treatment tank 2 and a second treatment tank 3, where sedimentary floating substances and floating floating substances are present. Primary treatment is performed to separate things from sewage. The sewage that has been subjected to the primary treatment is adjusted to a constant flow rate in the flow rate adjusting tank 4 and then flows into the measuring tank 5, where the sewage is metered by a pump or the like and sent to the next processing tank by a predetermined amount.
[0015]
The sewage from the measuring tank 5 flows into the contact aeration tank, where the secondary treatment is performed. In the present embodiment, first to third contact aeration tanks 6 to 8 are provided, and sewage flows sequentially from the first contact aeration tank 6 to the second contact aeration tank 7 and the third contact aeration tank 8, A secondary treatment (microbial treatment) of purifying by a microbial action by an aerobic microbial membrane attached to the contact material loaded in each of the contact aeration tanks 6 to 8 is performed.
[0016]
The sewage after the secondary treatment separates sludge such as microbial scum in the sedimentation tank 9, is converted into clear treated water, flows into the tertiary treatment tank 11 through the water storage tank 10, and is discharged from the discharge tank 12. Is done. Note that sludge such as scum of microorganisms settled in the settling tank 9 is pumped up through the sludge return pipe 13 and returned to the flow rate adjusting tank 4 for reprocessing.
[0017]
As shown in FIGS. 2 and 3, a plurality of contact material units 14 are provided in the first contact aeration tank 6. Note that a plurality of contact material units 14 are also provided in the second contact aeration tank 7 and the third contact aeration tank 8, and the configuration is the same as that provided in the first contact aeration tank 6. Therefore, in the following description, only the structure of the contact material unit 14 provided in the first contact aeration tank 6 will be described, and the structure of the contact material units provided 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 predetermined intervals to form a row of contact material unit groups 15, and this contact material unit 15 Are arranged in three rows at predetermined intervals. Each contact material unit group 15 has its upper surface fixed to a frame 16 laid 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 provided 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. You. At the same time, the rising of the air bubbles causes a circulating water flow in the first contact aeration tank 6, as indicated by the arrow in FIG. By this circulating water flow, the wastewater 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 member unit 14 includes a contact frame 18 and a plurality of contact plates 19 accommodated in the contact frame 18 at predetermined intervals. The contact frame 18 is formed by joining four plate members 18a made of pine such as larch using a joining member such as a nail or an adhesive. The contact plate 19 is also made of pine such as larch. Pine wood is inexpensive, hardly corrodes in water, and has a high porosity due to the gap between annual rings, so that it is excellent in durability and can stably fix the microbial membrane.
[0021]
Further, a plurality of sewage circulation holes 20 are formed in each of the plate members 18 a and each of the contact plates 19 that constitute the contact frame 18. The optimal size of each sewage flow hole 20 and the interval between the sewage flow holes 20 are set based on the effective volume of the first contact aeration tank 6, the flow rate of the circulating water flow, and the like. In addition, the size of the sewage flow holes 20 formed in each plate member 18a and each contact plate 19, and the interval between the sewage flow holes 20 need not be unique, and are, for example, formed at random. May be. As shown in FIG. 5, a burr portion 20a formed at the time of processing is left on the inner periphery of each sewage flow hole 20 as it is.
[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 wastewater treatment device is first and second treatment tanks 2 and 3 → flow rate adjustment tank 4 → measurement tank 5 → first to third contact aeration tanks 6 to 8 → sedimentation tank 9 → tertiary. After being processed in a predetermined manner through the treatment tank 11 → discharge tank 12, it is discharged.
[0023]
In each of the contact aeration tanks 6 to 8, oxygen is supplied to the sewage by aeration from an aeration pipe 17 provided at the bottom, and a slow circulating water flow is generated in the sewage as shown by an arrow in FIG. I do.
[0024]
When the sewage containing dissolved oxygen slowly circulates in each of the contact aeration tanks 6 to 8, the contact frame 18 constituting the plurality of contact material units 14 loaded in the contact aeration tanks 6 to 8 And contact with the aerobic microbial membrane formed on the surface of the contact plate 19 accommodated in the contact frame 18 to remove pollutants in water such as phosphorus and nitrogen.
[0025]
In addition, since the contact frame 18 and the contact plate 19 are made of pine material such as larch, the porosity due to the gap between the annual rings is high, and the microorganism film can be stably fixed on the surface. As a result, by repeatedly contacting the sewage with the microbial membrane, it is possible to remove most of the pollutants in the water, such as phosphorus and nitrogen, and to exhibit good purification performance.
[0026]
Further, a plurality of sewage flow holes 20 are formed in the contact frame 18 and the contact plate 19, and a burr portion 20a generated during processing is left as it is on the inner periphery of each sewage flow hole 20, so that the sewage is circulated. When flowing through the holes 20a, pollutants such as phosphorus and nitrogen contained in the sewage are removed by attaching to the burr 20a.
[0027]
As described above, in the present embodiment, since the contact frame 18 and the contact plate 19 constituting the contact material unit 14 are formed of pine such as larch, the porosity due to the gap between the annual rings of the pine is high, The microorganism membrane can be stably fixed on the surface, and water pollutants such as nitrogen and phosphorus can be effectively removed. Moreover, since pine is hard to corrode in water, it has excellent durability, can be used many times, and can reduce running cost.
[0028]
Furthermore, since the burr portion 20a generated during processing is left as it is on the inner periphery of the sewage flow hole 20 formed in the contact frame 18 and the contact plate 19, phosphorus contained in sewage is contained in the burr portion 20a. And nitrogen are attached and removed, so that a higher purification ability can be obtained.
[0029]
The present invention is not limited to the above-described embodiment. For example, a pine material such as larch is attached to the inner walls of each of the treatment tanks 2 and 3 and each of the contact aeration tanks 6 to 8 so that microorganisms can be removed. Processing can be performed effectively and efficiently.
[0030]
Further, the respective plate members 18a and the contact plate 19 constituting the contact frame 18 may be formed by sticking pine 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 formed of pine wood, it can be manufactured at low cost, and a high porosity can be obtained by the annual rings of the pine wood. Can be fixed stably. Further, pine wood is hardly corroded even when left in sewage for a long time, so that it has excellent durability and can reduce running cost.
[Brief description of the drawings]
FIG. 1 is a flowchart showing processing steps of a wastewater treatment apparatus. FIG. 2 is a plan view of a main part of the wastewater treatment apparatus. FIG. 3 is a sectional view of a main part of the wastewater treatment apparatus. FIG. 4 is an exploded perspective view of a contact material unit. 5 Enlarged view of main part of contact material unit [Explanation of reference numerals]
6-8 Contact aeration tank 14 Contact material unit 18 Contact frame 20 Sewage flow hole 20a Burr section

Claims (5)

A contact material unit provided in a contact aeration tank and having a contact plate for promoting microbial treatment in the contact aeration tank;
A contact material unit, wherein the contact plate is formed mainly of pine. 2. A contact material unit according to claim 1, wherein a plurality of said contact plates are mounted at predetermined intervals on a contact frame formed mainly of pine material. The contact member unit according to claim 2, wherein a plurality of the contact frame bodies are provided in the contact aeration tank. The contact material unit according to claim 2 or 3, wherein a plurality of sewage flow holes are formed in the contact frame and the contact plate. The contact material unit according to claim 4, wherein a burr is formed on an inner periphery of each of the sewage flow holes.

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