JP5926663B2 - In-pipe purification equipment - Google Patents

Description

The present invention relates to an in-pipe purification apparatus that prevents clogging with solid matter in sewage and can stably treat sewage.

In recent years, in order to reduce the burden on a sewage treatment facility, a method for purifying sewage in a pipeline using microorganisms has been proposed.
For example, Patent Document 1 discloses that a fixed bed is immersed in sewage by having a water-permeable fixed bed capable of fixing microorganisms and an oxygen supply means for supplying oxygen into the fixed bed. Even in such a state, a water purifier for a pipeline that can supply oxygen into a fixed bed and promote the growth of aerobic microorganisms has been disclosed.
Further, in Patent Document 2, fins are provided on the inside of the pipeline of the pressure feeding pipe, and a plurality of pipes are installed inside the pressure feeding pipe, thereby expanding the area where the sewage and the microorganisms come into contact with each other, and efficiently collecting the sewage. A method of purification is disclosed.

However, in the methods disclosed in Patent Document 1 and Patent Document 2, when sewage is run for a long period of time, solid matter and fibers in the sewage adhere to the fixed bed or fin biofilm, causing clogging. Since the contact efficiency of sewage is reduced, the purification performance of sewage may be deteriorated. That is, the conventional in-pipe purification apparatus having a means for holding a large amount of microorganisms in the pipe line and efficiently supplying oxygen to the microorganisms has a problem that clogging with solid substances is likely to occur.

JP 2010-024773 A Japanese Utility Model Publication No. 6-24799

Sewerage Facility Planning and Design Guidelines and Explanation (Part 2) -2009 Edition-P71 Japan Sewerage Association issued in September 2009

An object of this invention is to provide the purification apparatus in a pipe line which can prevent clogging with the solid substance in wastewater, and can process wastewater stably.

The present invention comprises a biofilm treatment tube for treating sewage with a biofilm, and a solid-liquid separation tube for solid-liquid separation of sewage before supplying the sewage to the biofilm treatment tube, together with the intermittently repeated structure and a filter media exposure by immersion and air filter medium by sewage, upper supernatant water is Ru is supplied to the biofilm process tube by overflowing up water level in the sewage above the solid-liquid separation tube In-pipe purification device.
The present invention is described in detail below.

In order to prevent clogging due to the solid matter in the sewage adhering to the biofilm, the present inventors considered to separate the solid matter from the sewage before contacting with microorganisms. However, in the conventional sedimentation separation tank as disclosed in Non-Patent Document 1, it is difficult to embed in the underground as a part of the in-pipe purification device, which is not practical.
Therefore, the present inventors connect a solid-liquid separation tube for solid-liquid separation of sewage to a biofilm treatment tube for treating sewage with a biofilm, and after separating solids with the solid-liquid separation tube, By supplying sewage to the biofilm treatment tube, even if the biofilm treatment tube has a means for holding a large amount of microorganisms in the pipeline and efficiently supplying oxygen to the microorganisms, The present inventors have found that clogging due to solid matter can be prevented and that sewage can be treated stably, and the present invention has been completed.

The in-pipe purification apparatus of the present invention has a solid-liquid separation pipe that separates sewage into solid-liquid before supplying the sewage to the biofilm treatment pipe. By having the solid-liquid separation pipe, the in-pipe purification apparatus of the present invention prevents clogging due to the solid matter in the sewage adhering to the microbial membrane, and stable processing performance over a long period of time. Can be maintained.

Examples of the method for solid-liquid separation of sewage using the solid-liquid separation tube include methods such as precipitation separation, floating separation, and mechanical screen. Among these, the method by precipitation separation is preferable because the production of the solid-liquid separation tube can be performed at low cost.

The length of the solid-liquid separation tube in the flow path direction is preferably 4 m or more. If the length of the solid-liquid separation tube in the flow path direction is less than 4 m, the solid matter in the sewage may not be sufficiently separated.

The preferable lower limit of the inner diameter of the solid-liquid separation tube is 1.0 m, and the preferable upper limit is 3.5 m. If the inner diameter of the solid-liquid separation tube is less than 1.0 m, the solid matter in the sewage may not be sufficiently separated, or the solid-liquid separation tube may be clogged with the separated solid matter. If the inner diameter of the solid-liquid separation tube exceeds 3.5 m, it will be difficult to embed it underground, or permission will be required to travel on the road. The more preferable lower limit of the inner diameter of the solid-liquid separation tube is 2.0 m, and the more preferable upper limit is 3.0 m.

The solid-liquid separation pipe is usually connected to a sewage inflow pipe for flowing sewage into the solid-liquid separation pipe and a sewage outflow pipe for flowing sewage from the solid-liquid separation pipe to the biofilm treatment pipe.
When solid-liquid separation of sewage is performed by precipitation separation, the inner diameter of the solid-liquid separation pipe is preferably at least 5 times the inner diameter of the sewage inflow pipe. If the inner diameter of the solid-liquid separation pipe is less than five times the inner diameter of the sewage inflow pipe, the flow rate of sewage flowing through the solid-liquid separation pipe increases, and solid matter in the sewage may not be sufficiently separated by precipitation. The inner diameter of the solid-liquid separation pipe is more preferably 10 times or more the inner diameter of the sewage inflow pipe.
The larger the inner diameter of the solid-liquid separation pipe, the larger the inner diameter of the sewage inflow pipe, the lower the flow rate of the sewage flowing through the solid-liquid separation pipe, and the solid-liquid separation performance by precipitation separation is improved. From the viewpoint of ease of embedding, the inner diameter of the sewage inflow pipe is preferably 20 times or less.

When the sewage is separated into solid and liquid by precipitation separation, the solid-liquid separation tube is used to remove the supernatant water from the sewage when the water level of the sewage flowing through the solid-liquid separation tube is higher than 1 m from the bottom of the solid-liquid separation tube. It is preferable to have a structure for discharging to the processing tube. If the level of the sewage flowing through the solid-liquid separation tube is less than 1 m, solids in the sewage may not be sufficiently separated. The level of sewage flowing through the solid-liquid separation tube is more preferably 1.5 m or more.
The higher the level of sewage flowing in the solid-liquid separation pipe, the better the solid-liquid separation performance.In order to increase the level of sewage flowing in the solid-liquid separation pipe, the inner diameter of the solid-liquid separation pipe must be increased. From the viewpoint of ease of embedding in the case of embedding underground, it is preferably 4 m or less.

As a method of discharging sewage from the solid-liquid separation pipe to the biofilm treatment pipe by the above sewage outflow pipe, for example, in the solid-liquid separation pipe, An overflow weir is installed at a position corresponding to the set height, and when the level of sewage flowing in the solid-liquid separation pipe becomes higher than the overflow weir, the supernatant water overflows from the overflow weir and the sewage flows out. The method etc. which make it flow into a pipe | tube are mentioned.

From the viewpoint of solid-liquid separation performance, the solid-liquid separation pipe preferably has a water area load of 70 m ³ / m ² · day or less with respect to the water area of the solid-liquid separation pipe with respect to the amount of incoming sewage. The residence time with respect to the volume is preferably 1.5 hours or longer. When the overflow weir is provided, the overflow weir load with respect to the length of the overflow weir is preferably 150 m ³ / m · day or less.

The material of the solid-liquid separation tube is not particularly limited as long as it has durability against sewage. For example, resins such as polyethylene and vinyl chloride, metals such as iron and ductile cast iron, and fiber reinforced plastics are used. And reinforced concrete (fume pipe).

It is preferable that the solid-liquid separation tube has a structure that can easily remove solids after being separated from sewage. Specifically, for example, a solid matter discharge port for drawing and discarding solid matter with a vacuum car or the like is provided in the solid-liquid separation tube.

The in-pipe purification apparatus of the present invention has a biofilm treatment tube for treating sewage with a biofilm. The effect of preventing clogging by having the solid-liquid separation tube is particularly significant when the biofilm treatment tube holds a large amount of microorganisms and has means for efficiently supplying oxygen to the microorganisms. Specific examples of the biofilm treatment tube holding a large amount of microorganisms include those having a surface area of the biofilm that is 10 times or more the surface area of the inner surface of the pipe.

As a biofilm treatment tube having a means for holding a large amount of microorganisms and efficiently supplying oxygen to the microorganisms, a biofilm treatment tube having a structure that intermittently repeats immersion of the filter medium with sewage and exposure of the filter medium with air Biofilm treatment having a structure in which a carrier (microorganism carrier) carrying microorganisms is filled in the gap between the outer tube and the inner tube of a double tube comprising an outer tube and a water-permeable inner tube A tube is more preferred.
Examples of means for imparting water permeability to the inner tube include a method of providing an opening in the inner tube. If sewage is allowed to flow through the inner pipe for a long period of time, solid matter in the sewage may adhere to and accumulate in the opening, resulting in clogging. In addition, if the opening of the opening is enlarged to prevent clogging of the opening, solid matter adheres and accumulates on the microbial carrier filled in the gap between the outer tube and the inner tube, and the microbial carrier is clogged. Sometimes.
Therefore, by connecting a solid-liquid separation tube to such a biofilm treatment tube and separating the solid matter in the sewage in advance, clogging of the filter medium and microbial carrier can be prevented, and for a long period of time. And stable processing performance can be maintained. Moreover, since the sewage after the solid matter is separated and removed is treated with the biofilm treatment tube, the treatment performance of the entire in-pipe purification device is improved.

Since the biofilm treatment tube and the solid-liquid separation tube are tubular, they are buried underground, or the respective pipe lines of the biofilm treatment tube and the solid-liquid separation tube are extended as necessary. It becomes easy.
The biofilm treatment tube and the solid-liquid separation tube may have a circular or circular cross-sectional shape, but are preferably circular.

ADVANTAGE OF THE INVENTION According to this invention, the clogging by the solid substance in wastewater can be prevented, and the in-pipe purification apparatus which can process a wastewater stably can be provided.

FIG. 1 is a cross-sectional view in the longitudinal direction (flow path direction) showing an example of the in-pipe purification apparatus of the present invention. FIG. 2 is a cross-sectional view of the solid-liquid separation pipe shown in FIG. 1 in the pipe radial direction.

Hereinafter, the sewage treatment apparatus of the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited only to the embodiments shown in these drawings.

1 is a cross-sectional view in the longitudinal direction (flow path direction) showing an example of the in-pipe purification apparatus of the present invention, and FIG. 2 is a cross-sectional view in the pipe radial direction of the solid-liquid separation pipe shown in FIG. is there.
The in-pipe purification apparatus 1 in FIG. 1 includes a biofilm treatment tube 2 that treats sewage with a biofilm, and a solid-liquid separation tube 3 that separates sewage into solid and liquid before supplying the sewage to the biofilm treatment tube. Have. The solid-liquid separation tube 3 shown in FIG. 1 separates sewage into solid and liquid by precipitation separation. Connected to the solid-liquid separation tube 3 are a sewage inflow tube 4 for flowing the sewage 6 into the solid-liquid separation tube 3 and a sewage outflow tube 5 for flowing the sewage 6 from the solid-liquid separation tube 3 into the biofilm treatment tube 2. ing.

When the sewage 6 flowing through the sewage inflow pipe 4 flows into the solid-liquid separation pipe 3 having a large inner diameter, the flow velocity is remarkably reduced, and the solid matter 7 in the sewage 6 is precipitated at the bottom of the solid-liquid separation pipe 3.
As shown in FIG. 2, an overflow weir 8 is provided in the solid-liquid separation pipe 3. The supernatant water 9 separated from the solid matter 7 from the sewage 6 overflows from the overflow weir 8 due to the rise of the level of the sewage 6 in the solid-liquid separation pipe 3 and flows into the sewage outflow pipe 5 as it is. Supplied to the tube 2. The supernatant water 9 supplied to the biofilm treatment tube 2 is purified in the biofilm treatment tube 2.

Since the solid 7 in the sewage 6 is separated by the solid-liquid separation tube 3, it does not flow out to the biofilm treatment tube 2, and only the supernatant water 9 is supplied to the biofilm treatment tube 2. Therefore, the solid matter 7 adheres to the biofilm of the biofilm treatment tube 2, or the biofilm treatment tube 2 includes an outer tube 10 and a water-permeable inner tube 11 as shown in FIG. In the case of the double tube structure, the solid matter 7 is prevented from clogging the microbial carrier 12 filled in the opening of the inner tube 11 and the gap between the inner tube 11 and the outer tube 10.
In addition, in FIG. 1, although the biofilm processing tube which has a double tube structure is described as the biofilm processing tube 2, the biofilm processing tube in the in-pipe purification apparatus of this invention has a double tube structure. If it is a biofilm treatment tube that has a structure that intermittently repeats immersion of filter media with sewage and exposure of filter media with air, it is effective to prevent clogging by connecting a solid-liquid separation tube. Demonstrated greatly.

The solid-liquid separation tube 3 is provided with a solid material discharge port 13, and the solid material 7 separated by the solid-liquid separation tube 3 is periodically pulled out from the solid material discharge port 13 with a vacuum car or the like and discarded. .

ADVANTAGE OF THE INVENTION According to this invention, the clogging by the solid substance in wastewater can be prevented, and the in-pipe purification apparatus which can process a wastewater stably can be provided.

DESCRIPTION OF SYMBOLS 1 In-pipe purification apparatus 2 Biofilm processing pipe 3 Solid-liquid separation pipe 4 Sewage inflow pipe 5 Sewage outflow pipe 6 Sewage 7 Solid matter 8 Overflow weir 9 Supernatant water 10 Outer pipe 11 Inner pipe 12 Microorganism carrier 13 Solid matter outlet

Claims (5)

A biofilm treatment tube for treating sewage with a biofilm, and a solid-liquid separation tube for solid-liquid separation of sewage before supplying the sewage to the biofilm treatment tube ,
The biofilm treatment tube has a structure that intermittently repeats the immersion of the filter medium with sewage and the exposure of the filter medium with air, and the sewage water level in the solid-liquid separation pipe rises and overflows, so that the supernatant water becomes the organism. duct cleaning apparatus according to claim Rukoto supplied to the membrane process tube. The in-pipe purification apparatus according to claim 1, wherein the biofilm treatment tube has a biofilm surface area of 10 times or more of the surface area of the inner surface of the pipe line. The in-pipe purification apparatus according to claim 1 or 2, wherein the solid-liquid separation pipe has an overflow weir. The biofilm treatment tube has a structure in which a carrier carrying microorganisms is filled in a gap between an outer tube and an inner tube of a double tube composed of an outer tube and a water-permeable inner tube. The in-pipe purification apparatus according to claim 1, 2, or 3. The in-pipe purification apparatus according to claim 1, 2, 3, or 4, wherein the biofilm treatment pipe and the solid-liquid separation pipe have a circular cross-sectional shape in the pipe radial direction.

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