JPS61212390A - Septic device for sewage - Google Patents

Abstract

PURPOSE:To eliminate the agitated flow and to reduce the necessary power by moving continuously or intermittently a catalytic device for forming a microbe layer in the septic tank for sewage. CONSTITUTION:A catalytic device 3 for forming a microbe layer is continuously or intermittently moved in a septic tank 1 for sewage. Namely, since sewage is brought into contact with microbe layer by rotating the microbe layer, only the amt. of air enough to satisfy the biological and chemical oxygen demands necessary for the sewage and the microbe layer is supplied into the septic tank and the large power used in supplying air for agitating sewage in the conventional technique can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to a sewage purification device, and more particularly to a sewage purification device that purifies sewage using a microbial layer.

(2) Prior art and its problems A sewage purification apparatus has been used in the past, in which a contact plate is provided in a sewage purification tank, and the sewage is purified by a microbial layer formed on the contact plate.

In such purifiers, the contact plate is fixedly installed inside the sewage septic tank, and the sewage inside the septic tank is aerated with air that is blown out from the air pipe installed at the bottom of the septic tank. The sewage is agitated, thereby bringing the sewage into contact with the microorganism layer, thereby purifying the sewage with the microorganisms.

However, in such a septic tank, air is used to simultaneously supply dissolved oxygen (DO) into the wastewater and to stir and flow the wastewater to bring it into contact with the microbial layer. This method has the disadvantage that the amount of power consumed is large, which in turn significantly increases the wastewater treatment cost.

In addition, in order to improve the degree of purification of sewage, it is necessary to activate the flow of sewage through the air and increase the number of contact points a between the microorganism layer and the sewage, but increasing the number of contacts also increases power consumption. Considering the economic efficiency, sufficient purification of wastewater cannot be expected.

Furthermore, since it is difficult to uniformly disperse the air in the wastewater, the supply of air to the microbial layer becomes uneven, resulting in partial anaerobic formation of the microorganisms.

(3) Means for Solving the Problems and Structure of the Invention The present invention overcomes the drawbacks of the prior art as described above.The present invention is intended to overcome the drawbacks of the prior art as described above. Although bringing the microbial layer into contact requires a large amount of power, we realized that by moving the microbial layer, it is possible to bring the wastewater into contact with the microbial layer more effectively with less power. This movement eliminates the agitation and flow of sewage, which is one of the effects of air in the prior art, thereby reducing the required power.

That is, the sewage purification apparatus of the present invention has a structure including a contact device for forming a microbial layer that is movably provided in a sewage purification tank.

(4) Examples Next, the present invention will be described in detail with reference to the drawings.

Referring to FIGS. 1 and 2 showing an embodiment of the present invention, the sewage purification apparatus includes a cylindrical septic tank l and a rotating shaft 2 rotatably mounted approximately in the center of the septic tank. It comprises a contact device or frame 3 and a drive 4 for rotating the rotation axis 2 and thus the radial frame.

The septic tank 1 is provided with an overflow gutter 5 extending along its inner periphery, and between the overflow gutter and the frame 3 is a substantially cylindrical partition whose upper part extends above the liquid level. 6 is provided. A drainage pipe 7 is provided in a circumferential portion of the overflow gutter 5 for discharging purified treated water to the outside of the purified ml.

A diffuser pipe 8 for introducing air into the septic tank circle is provided near the bottom of the septic tank. A plurality of holes (not shown) are formed around the periphery of the aeration pipe 8, so that air can be evenly supplied to the wastewater.

An inflow pipe 9 for supplying wastewater is attached to the upper part of the septic tank. This inflow pipe is provided at a position to introduce wastewater into the partition body 6 in the radial direction as shown in the figure. In order to achieve good uniform wastewater purification, the inlet pipe is preferably positioned so that the wastewater enters close to the rotating shaft 2.

The drive unit 4 includes a driven gear 1 fixed to the upper part of the rotating shaft 2.
1, and a motor 13 having a drive gear 12 that meshes with the driven gear 11. The motor 13 is mounted on a support beam 14 extending above the septic tank 1, as best shown in FIG.

The rotating shaft 2 is rotatably supported by an upper bearing 15 and a lower bearing 16.

As clearly shown in FIG. 2, the frame 3 has, in this embodiment, twelve frame sectors α to t(d and )° (not shown), each sector having a The annular filament 20 shown in FIG. 3 is stretched so as to cover the space in the valley sector as shown in FIG. 1.

Such annular microfilament is described in Japanese Patent Application Laid-Open No. 59-225793.
As described in the above publication, microorganisms are trapped inside and around the microorganism to form a microbial layer, and this microbial layer has the effect of purifying wastewater.

Next, the operation of the sewage purification apparatus according to the embodiment of the present invention shown in FIGS. 1 and 2 will be explained.

Sewage, which is treated raw water, is introduced into the inlet pipe as shown by arrow A in FIG. 1, and is supplied into the septic tank l through this inlet/q pipe in the direction shown by arrow B in FIG. Here, since the sewage is introduced radially inside the partition 6, the inflowing sewage is guided to the lower part of the septic tank through the inside of the partition 9 without flowing into the trough 17 of the overflow gutter 5.

Air supplied from the diffuser pipe 8 provided at the bottom of the septic tank 1 is dispersed in the radial direction by the frame body 3 rotated by the drive unit 4 while rising inside the partition body 6, thereby evenly distributing the air to the wastewater. When the aerobic microorganisms in the wastewater begin to propagate due to the air supply, the annular filament 20 stretched over each sector α-B
Microorganisms adhere to the top and multiply, forming a microbial layer consisting of various microbial groups in each sector.

The microbial layer formed in this way rotates in the wastewater while being supplied with air from the aeration pipe, repeatedly coming into contact with the wastewater that passes through the microbial layer, thereby performing aerobic growth. It purifies organic matter in wastewater.

The sewage that has been purified by the purifying action of the microbial layer while flowing down inside the partition becomes treated water, rises through the gap between the outside of the partition 6 and the septic tank 1, and enters the trough air. Inflow. The treated water that has flowed into the trough air is discharged to the outside of the system through the drainage pipe 7 as shown by arrow C.

As described above, in the purification treatment apparatus of the present invention, contact between the sewage and the microbial layer is achieved by rotating the microbial layer, so the amount of air introduced into the septic tank is limited relative to the sewage and the microbial layer. The amount of air that is sufficient to meet the biochemical oxygen requirements required for water treatment can be omitted, thus eliminating the need for large amounts of air to agitate and flow wastewater as in the prior art. Further, it is also possible to adjust and supply the optimal air amount for purification treatment according to the inflow amount of sewage or the JjOD of sewage.

Furthermore, the rotation of the microbial layer makes it possible to supply air evenly to the microbial layer, thereby preventing the microbial layer from becoming partially anaerobic, thereby making it possible to maintain a stable microbial layer.

In the above-mentioned embodiment, a rotating shaft extending vertically is provided inside the septic tank, and the microbial layer is rotated around this rotating shaft. It is also possible to provide a structure in which the microorganism layer is provided in parallel with the sewage surface and rotated around this rotation axis.

Furthermore, the movement of the microbial layer is not limited to rotation, but can also be made to reciprocate in the horizontal direction, vertical direction, or other directions. Further, these movements can be performed not only continuously but also intermittently or in a combination of continuous movements and intermittent movements.

Furthermore, in order to increase the amount of treated wastewater or to perform advanced treatment of wastewater, a plurality of single purification treatment apparatuses can be connected in series and used.

Furthermore, instead of installing an aeration pipe in the septic tank to supply air, oxygen is dissolved in the wastewater before it flows into the septic tank using an appropriate means such as a pressurized tank, thereby eliminating the need for an aeration pipe. You can also do that.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a perspective view of an annular filament. 1... Septic tank 2... Rotating shaft 3... Frame body 4... Drive part 6... Partition body
8... Diffuser patent applicant Tadashi Takahashi
Norio Ono (5 others)

Claims (3)

[Claims] (1) A sewage purification device characterized in that a contact device for forming a microbial layer in a sewage septic tank is moved continuously or intermittently within the sewage water. (2) The sewage purification device according to claim 1, wherein the contact device is configured to move the microorganism layer in a direction in which the sewage passes. (3) A sewage purification device according to claim 1, wherein the contact device is configured to rotate around an axis substantially perpendicular to the surface of the sewage water.