JPH1157767A - Sewage treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive sewage treating device capable of pulling-up an air diffuser from an aerobic treating tank or mounting the air diffuser on the tank without being disturbed with a contact material and without using a flexible tube being easy to cause a break, the detachment of a connecting part, rust, corrosion, etc. SOLUTION: In this device, a vertical air pipe 5 supplying air from an air supply source to an air diffuser 3 and the air diffuser 3 are connected with a revolving pipe joint 4 mounted rotatably around a horizontal axis at the lower end of the air pipe 5. A guide mechanism preventing the contact of the air diffuser 3 and a contact material or a membrane filter device at the time of pulling-up the air diffuser 3 from the aerobic treating tank and at the time of mounting it on the aerobic treating tank is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sewage treatment apparatus for aerobically treating sewage.

[0002]

2. Description of the Related Art In aerobic treatment in which pollutants are biologically treated by aerobic microorganisms, air is supplied from an air supply source such as a blower to a diffuser installed in an aerobic treatment tank and laid vertically downward. The air is supplied to the air diffuser through the air supply pipe, and the air is blown into the aerobic treatment tank through a number of small air ejection holes formed in the air diffuser to perform aeration.

[0003] In such a sewage treatment apparatus, the air ejection holes may be clogged by sludge or the like, and the air diffuser may not function properly. In such a case, maintenance for regularly cleaning the air ejection holes of the air diffuser with a brush or the like is performed. However, in order to do so, the air diffuser must be lifted out of the aerobic treatment tank, the air ejection holes must be cleaned, and then the air diffuser must be installed in the aerobic treatment tank again. There is a problem that it is extremely difficult.

Recently, in order to increase the efficiency of aeration,
A contact material to which aerobic microorganisms are attached is installed in an aerobic treatment tank, and a full-aeration type sewage treatment device in which a diffuser is installed below the contact material is used. In such a full-aeration type sewage treatment apparatus, since the diffuser is disposed directly below the contact material, mounting and removing the diffuser is more difficult. The volume of the device must be reduced.

Therefore, Japanese Patent Application Laid-Open No. 6-254586 discloses an air diffuser which facilitates loading and unloading of the aerobic treatment tank during such maintenance.
In this air diffuser, one end of the air diffuser is attached to the lower end of a vertical pipe (air supply pipe) via a solid joint so as to be rotatable around a horizontal axis, and the vertical pipe and the air diffuser are connected by a flexible tube. Air is supplied from the vertical pipe to the diffuser pipe through the flexible tube, and is blown out from the air blowout hole formed in the upper surface of the diffuser pipe into the aerobic treatment tank, where aeration is performed. Done.

[0006] In order to move the diffuser tube into and out of the aerobic treatment tank, the diffuser tube is rotated around the horizontal axis of the joint, guided by the vertical guide rail and the horizontal guide rail, and removed from the lower part of the contact material or contacted. Attach to the lower part of the material.

However, when a flexible tube made of a synthetic resin is used particularly in a place such as the bottom of an aerobic treatment tank, the flexible tube is crushed by external pressure, pores are opened due to repeated bending, and a vertical tube is formed. And the connection with the air diffuser may be disconnected, resulting in air leakage. Further, the metal flexible tube has a problem that movement is restricted due to poor flexibility, rust or corrosion may be caused by sewage, and the cost is high.

Further, even in the case of an activated sludge system which does not use a contact material to which aerobic microorganisms are adhered, a membrane filtration device (membrane module) is installed on a diffuser to filter aerobic treated wastewater by membrane filtration. The use of sewage treatment equipment that filters by equipment is increasing, and even in this case, each time the air diffuser is installed and removed, the membrane filtration apparatus similarly interferes, and the air diffuser and the membrane itself are damaged. There's a problem.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been developed in such a manner as not to be hindered by a contact material or a membrane filtration device at the time of maintenance or the like. To provide an inexpensive sewage treatment apparatus that can pull up or attach an air diffuser, and does not use a flexible tube that may be crushed, broken, disconnected from a connection part, or rusted or corroded. It is intended.

[0010]

In order to achieve the above object, the present invention provides a contact material or a membrane filtration device having an aerobic microorganism adhered in an aerobic treatment tank. Is a sewage treatment apparatus in which an air diffuser is detachably provided at a lower portion of the sewage treatment apparatus, wherein a vertical air supply pipe for supplying air from an air supply source to the air diffuser and an air diffuser are horizontally disposed at a lower end of the air supply pipe. It is connected by a rotary pipe joint that is rotatably mounted on the axis, and when the air diffuser is pulled up from the aerobic treatment tank and laid in the aerobic treatment tank, the air diffuser and the contact material or the membrane filtration device And a guide mechanism for preventing the contact with the guide member.

In the present invention, the term “rotating pipe joint” refers to a pipe joint capable of mutually rotating between pipes (“Mechanical Design Handbook” published by Nikkan Kogyo Shimbun), for example, FIG. (Details will be described later).

(Operation) In the sewage treatment apparatus of the present invention, a vertical air supply pipe and a diffuser are connected to a lower end of the air supply pipe by a rotary pipe joint rotatably mounted on a horizontal axis. Therefore, air can be supplied from the air supply pipe to the air diffuser through the rotary pipe joint, and there is no need to separately provide a conduit such as a flexible tube connecting the air supply pipe and the air diffuser.

In addition, the air diffuser rotates at the rotary pipe joint so as to be able to adjust the horizontal inclination with respect to the air supply pipe, and is not contacted with the contact material or the membrane filtration device by the guide mechanism. It can be lifted from below the contact material or laid under the contact material or membrane filtration device.

[0014]

Embodiments of the present invention will be specifically described below with reference to the drawings. 1 is a perspective view showing an embodiment of the sewage treatment apparatus of the present invention, FIG. 2 is a plan view of an air diffuser in the sewage treatment apparatus of the present invention, FIG. 3 is a side view of the air diffuser, and FIG. FIG. 5 is a perspective view of a guide mechanism of the air diffuser.

An aerobic treatment tank 1 of a sewage treatment apparatus is provided with a contact material 2 to which aerobic microorganisms are attached, and an aerobic material attached to the contact material 2 is provided below the contact material 2. An air diffuser 3 for supplying air (correctly, oxygen in the air) to the microorganisms is provided. The lower end of a vertically-pumped hard vinyl chloride air supply pipe 5 is connected to the air diffuser 3, and the upper end of the air supply pipe 5 is connected to an air supply source installed outside the aerobic treatment tank 1. (Not shown). Note that the air supply pipe 5 is movable in the vertical direction.

The air diffuser 3 is formed by combining a plurality of air diffusers (hard vinyl chloride pipes) 31, a plurality of hard vinyl chloride pipe joints (cheese 32 and elbow 33), and two rotary pipe joints 4. , Assembled into a rectangular frame. A plurality of air ejection holes 315 are formed on the upper surface of the air diffuser 31.

Next, the configuration of the air diffuser 3 will be described in more detail. Since the air diffuser 3 is formed symmetrically with respect to the air supply pipe 5, only one side will be described. The lower end of the air supply pipe 5 is adhesively bonded to the branch port of the cheese 32 (1) in the center of the horizontal (width) pipe in the first row of the air diffuser 3, and one main pipe section of the cheese 32 (1) is received. A diffuser 3 in the mouth
One end of 1 (1) is adhesively bonded, and the other end of the diffuser 31 (1) is connected to a rotary pipe joint 4 made of hard vinyl chloride.

The rotary fitting 4 includes a union screw 41, a union flange 42, a union nut 43, and a union flange 4.
O-ring 4 fitted into an annular groove formed on the inner surface of
The union screw 41 has an adhesive receiving port 411 for a rigid polyvinyl chloride pipe at one end and an adhesive receiving port 421 for a hard vinyl chloride pipe at one end of the union flange 42. Then, one end of the air diffuser 31 (1) is bonded to the adhesive receiving port 411, one end of the other diffuser pipe 32 is bonded to the adhesive receiving port 421, and the female screw provided on the inner surface of the union nut 43 is connected to the union. It is screwed and fastened to a male screw provided on the outer surface of the collar 42. This allows the air diffusers 31 (1) and 31
(2) is joined via the rotary pipe joint 4.

Thus, the air supplied from the air supply pipe 5 can be supplied to the air diffuser 3 through the rotary pipe joint 4. Further, since the central portion and both end portions of the horizontal piping in the first row of the diffuser 3 are joined via the rotary pipe joint 4, the entire diffuser 3 is arranged in a horizontal direction with respect to the air supply pipe 5. The inclination can be adjusted freely.

In the aerobic treatment tank 1, a diffuser 3 is provided.
Guide mechanism 6 is provided. The guide mechanism 6 includes a vertical guide rail 61 made of light-groove steel laid vertically along the wall surface of the aerobic treatment tank 1, and a horizontal guide laid horizontally along the bottom surface of the aerobic treatment tank 1. Guide rail 6
2. A direction changing guide 611 protruding in the middle of the vertical guide rail 61 toward the direction of the contact material 2, a stopper 621 provided near the tip of the horizontal guide rail 62, and a wall surface of the aerobic treatment tank 1. And an inclined guide plate 63 provided between the bottom and the bottom surface.

The operation when aerobic treatment is performed by the sewage treatment apparatus configured as described above will be described below. The air sent from the air supply source (not shown) through the air supply pipe 2 passes through the rotary pipe joint 4 and is sent to each of the air diffusion pipes 31 of the air diffusion apparatus 3, but the union screw 41 and the union flange 4
2 is sealed by an O-ring, so that the air does not leak on the way, and finally blows out into the sewage from the air blow-out hole 315 on the upper surface of the diffuser tube 31 and is aerobic attached to the contact material. The microorganisms are aerated and subjected to aerobic treatment with oxygen in the air.

Next, the operation of lifting the air diffuser 3 from the aerobic treatment tank 1 for maintenance or the like will be described. When the air supply pipe 5 is pulled up from the state shown in FIG. 1 and the left and right vertical pipes of the air diffuser 3 come into contact with the direction changing guide portion 611 provided in the middle of the vertical guide rail 61, one line of the air diffuser 3 is provided. In the horizontal piping of the eye, the portion of the rotary joint 4 rotates about the horizontal axis, so that the air diffuser 3 is guided and bent by the direction changing guide portion 611 as shown in FIG. When the air supply pipe 5 is further pulled up, it enters into the vertical guide rail 61 and is pulled up as it is.

When the air diffuser 3 is laid in the aerobic treatment tank 1, the air supply pipe 5 is pushed down along the vertical guide rail 61, and the lowermost (fourth row) horizontal piping of the air diffuser 3 is installed. Is in contact with the inclined guide plate 63, in the horizontal piping of the first row of the diffuser 3, the portion of the rotary joint 4 rotates about the horizontal axis, and the diffuser 3 is guided by the inclined guide plate 63. And is further guided by the horizontal guide rails 62 and abuts against a stopper 621 provided near the distal end to stop. Thereby, the air diffuser 3 is laid horizontally below the contact member 2.

Next, a sewage treatment apparatus according to the present invention will be described.
With respect to a conventional sewage treatment apparatus provided with a conventional air diffuser as disclosed in JP-A-254586, the manufacturing cost of the air diffuser and the durability of the air diffuser were compared.

(Embodiment) A diffuser 3 has a horizontal (width) dimension of 400 mm, a vertical dimension of 420 mm, and an inner diameter of 13 mm.
The air diffuser 31 made of hard vinyl chloride has 10 air ejection holes 315 having a diameter of 2 mm, and the rotary joint 4 is made of hard vinyl chloride. The production cost of the diffuser 3 was set at 100 in relation to the comparative example. The depth of the aerobic treatment tank 1 was 1800 mm, the air supply pipe 5 was also made of hard vinyl chloride having an inner diameter of 13 mm, and the length in the vertical direction was 2200 mm.

Using the above sewage treatment apparatus, aerobic treatment was carried out while maintaining the MLSS concentration at about 15,000 mg / l, and the air diffuser 3 was removed and attached once every two months, and one year later. The state of deterioration of the air diffuser 3 was examined. As a result, no air leakage from the air diffuser 3 and other abnormalities were observed, and no deterioration in the components and operating conditions of the air diffuser 3 was observed.

(Comparative Example 1) A sewage treatment apparatus having the same structure as that of the embodiment except that a solid joint and a stainless steel flexible tube were used for the air diffuser, the production cost and the air diffusion one year after use. The deterioration state of the device was examined. The manufacturing cost of the air diffuser was about 400, four times that of the example. In addition, no air leakage from the air diffuser and other abnormalities were observed, and no deterioration in the components and operating conditions of the air diffuser was observed.

(Comparative Example 2) With respect to a sewage treatment apparatus having the same structure as that of Comparative Example 1 except that a flexible tube made of tetrafluoroethylene was used, the production cost and the state of deterioration of the air diffuser one year after use were examined. Was. The manufacturing cost of the diffuser was about 250, which was 2.5 times that of the example. In addition, it was observed that there were two fine holes in the bent portion of the flexible tube, from which air leaked.

Table 1 summarizes the above results.

[0030]

[Table 1]

Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above, and the present invention includes design changes and the like without departing from the spirit of the present invention. For example, in the embodiment,
Although a rotary pipe joint having a union connection at only one end as shown in FIG. 4 was used, an expansion joint having a union connection at both ends may be used.

In the embodiment, the contact material to which aerobic microorganisms are attached is provided in the aerobic treatment tank. However, in addition to the contact material, a membrane filtration device is further provided. You may.

Since the sewage treatment apparatus of the present invention has the above-described structure, it is not necessary to use a flexible tube.
Opening of pores due to repeated bending, detachment from connection,
The air can be supplied to the air diffuser without causing rust and air leakage due to the cause. In addition, since the contact member can be pulled up from below or laid under the contact member without being in contact with the contact member, the contact member or the air diffuser is not damaged. Further, the production cost and maintenance cost are lower than when a flexible tube made of special resin or stainless steel is used.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a sewage treatment apparatus of the present invention.

FIG. 2 is a plan view of an air diffuser of the sewage treatment apparatus shown in FIG.

FIG. 3 is a side view of the air diffuser shown in FIG. 2;

FIG. 4 is a longitudinal sectional view of a rotary pipe joint used in the air diffuser shown in FIG. 2;

FIG. 5 is a perspective view showing a guide mechanism of an air diffuser in the sewage treatment apparatus shown in FIG. 1;

FIG. 6 is a sectional view showing a state in which the air diffuser is pulled up from the aerobic treatment tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aerobic treatment tank 2 Contact material 3 Air diffuser 31 Air diffuser 315 Air ejection hole 4 Rotary pipe joint 41 Union screw 42 Union flange 43 Union nut 44 O-ring 5 Air supply pipe 6 Guide mechanism of air diffuser

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 3/06 C02F 3/06

Claims (1)

[Claims] 1. A sewage treatment apparatus in which an aerobic treatment tank is provided with a contact material or a membrane filtration device to which aerobic microorganisms are attached, and a diffusion device is detachably provided below the contact material or the membrane filtration device. A vertical air supply pipe for supplying air from the air supply source to the air diffuser and the air diffuser are connected by a rotary pipe joint rotatably attached to a lower end of the air supply pipe around a horizontal axis. It is characterized in that a guide mechanism is provided to prevent contact between the air diffuser and the contact material or the membrane filtration device when pulling up the air diffuser from the aerobic treatment tank and laying in the aerobic treatment tank. Wastewater treatment equipment.