JPH0494795A - Submersible sewage cleaning device - Google Patents

Abstract

PURPOSE:To obtain the small-scale submersible sewage cleaning device of simple structure by arranging a screen, sand settling chamber, flow straightening chamber, catalytic oxidation chamber packed with a filter medium and submersible suction pump in series practically along the water bottom. CONSTITUTION:The catalytic oxidation chamber 4 packed with a cylindrical filter medium 7 has buoyancy and is difficult to sink. However, since the chamber is sucked by a submersible pump 5 from the screen side, the pressure in the chamber is made negative, a part of the screen 1 of the device A is exposed, the device is successively sunk in water to the pump side and set along the water bottom WB as a whole. Sewage is passed through the sand settling chamber 2 to remove easy-to-settle SS. The sewage flow toward the oxidation chamber 4 is straightened by the hole 8a of the flow straightening chamber 3. The sewage is passed through the oxidation chamber 4, SS is collected, and the org. matter is oxidized and decomposed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a submersible sewage purification device suitable for purifying waters such as lakes and marshes where photosynthesis is active and the dissolved oxygen concentration in the water is relatively high.

[Prior Art] Various methods have been proposed for river purification. One such method is wastewater purification by aeration. This pumps air into the wastewater to be purified,
Conventional sewage purification methods using aeration, which forcefully bring the sewage into contact with air, include a full-surface aeration method and a partial aeration method. It supplies oxygen throughout. On the other hand, in the partial aeration method, only a portion of the aeration tank is aerated to create a swirling flow, thereby supplying oxygen to the entire tank.

[Problem to be solved by the invention] However, it is difficult to purify sewage existing on the water surface of lakes, marshes, or large rivers with large basin areas and relatively slow flow rates using conventional methods such as aeration purification. It was extremely inefficient. In other words, if you try to aerate the whole area of lakes, marshes, large rivers, etc., you will need a very large and complex structure, and the cost will be enormous, so it is virtually impossible to implement full-scale aeration. . On the other hand, in the case of partial aeration, the amount of water to be purified is extremely large since lakes, marshes, large rivers, etc. hold a large amount of water, and the amount of filter material filled in the filter medium is small, so it is not effective.

However, it is known that lakes and marshes are bodies of water where photosynthesis is active and the concentration of dissolved oxygen in the water is relatively high.

SUMMARY OF THE INVENTION An object of the present invention is to provide a small-scale, simple-structured submersible sewage purification device for purifying sewage in water areas such as lakes and marshes where photosynthesis is active and the concentration of dissolved oxygen in the water is relatively high.

[Means for Solving the Problems] According to the present invention, a screen, a settling chamber,
A rectification chamber, a contact oxidation chamber filled with filter media, and a suction type submersible pump are arranged in series.

-1 The filter medium mentioned above is composed of a large number of cylindrical bodies, which are formed by removing the bottom of a container of the brand name Yakult, and are arranged in a dense manner at random. It is preferable to do so.

Further, the cross-sectional area and length of the catalytic oxidation chamber are preferably determined so that the dissolved oxygen concentration at the outflow portion is 1 mg/(1 or more).

Furthermore, the catalytic oxidation chamber may be defined by providing partition plates with holes in the front and rear edges of a cylinder made of vinyl chloride, or may be formed by bundling a large number of large diameter pipes. In place of the perforated partition plate, the vinyl chloride tube may be partitioned by a wire mesh.

In carrying out the invention, it is preferable that the suction 11 is provided with a filtering device filled with a filtering medium. In this case, the filtration device is preferably of a so-called attachment type that can be separated.

In addition to this, it is preferred to provide a sludge extraction pipe within the catalytic oxidation chamber. Here, the sludge extraction pipe is configured to be slidable, and is equipped with a vacuum car, a suction pump,
Preferably, it is connected to other suction means.

[Function] In the purification device configured as described above, buoyancy occurs because the contact oxidation chamber is a space, but since suction is carried out by a submersible pump, the internal pressure becomes negative pressure, and the screen of the device is partially exposed in the water. , the submersible pump side is gradually submerged in water, and the overall shape follows the bottom of the water. Then, the wastewater sucked from the screen by the submersible pump flows into the settling chamber.
Precipitable SS is removed. Next, the flow is rectified in the rectification chamber and flows into the catalytic oxidation chamber, where the ss is effectively captured by the cylindrical filter medium, and organic matter is oxidized and purified before being discharged from the submersible pump.

Furthermore, if a filtration device filled with a filter material is provided in the suction 11,
The sand settling effect is improved and foreign matter is prevented from entering the device. As a result, maintenance and management of the device becomes easier.

In addition, if a sludge withdrawal pipe is installed in the contact oxidation chamber, the increase in water flow resistance caused by excessive accumulation of sludge, that is, substances that cannot be biologically oxidized (e.g. mud, solids), the reduction of the aerobic part, and the effective volume rain is effectively prevented.

[Example] The present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, the purification device designated as No. 7A as a whole is located between the water surface WL and the water bottom W13 of a water body such as a lake where photosynthesis is active and the dissolved oxygen concentration in the water is relatively high. It is provided along the WB.

In this apparatus A, a screen 1, a settling chamber 2, a rectification chamber 3, a contact oxidation chamber 4, and a suction type submersible pump 5 are arranged in series. As will be described later, a portion of the screen 1 is exposed to the water surface, and is designed to remove dirt and the like from sewage and to suck in air.

The settling chamber 2 is designed to settle and remove settleable solids (SS) in the wastewater that has flowed in from the screen 1.

The rectifying chamber 3 is separated from the sand settling chamber 2 by a partition plate 3a above]
It is partitioned up to the corner portion 3b, and the wastewater flowing in from the opening 3b is rectified by passing through a hole 8a of a front partition plate 8, which will be described later.

The contact oxidation chamber 4 is formed by filling a vinyl chloride tube 6 with a filter medium 7, and defining a front partition plate 8 and a rear partition plate 9, each having a hole 8as9a large enough to prevent the filter medium 7 from protruding at the front and rear thereof. There is. The filtering medium 7 may be any known technology, but is preferably composed of a large number of cylindrical bodies, the bottoms of which are removed from containers of the brand name Yakult, which are densely assembled and arranged at random, for example. . This effectively captures suspended solids (SS) in wastewater, retains aerobic organisms nψ, and oxidizes and decomposes organic matter.

The submersible pump 5 is connected to a land power source (not shown) via an electric wire 10, and is configured to suck purified water and discharge it.

Next, the effect will be explained.

Since the contact oxidation chamber 4 is filled with a cylindrical filter medium 7, buoyancy is generated and it is difficult to be submerged in water. However, since the submersible pump 5 sucks from the screen 1 side, there is negative pressure inside.
The device A is set as a whole along the water bottom WB with a part of the screen 1 exposed and gradually submerged in water on the side of the submersible pump 5.

Further, even if the inside of the catalytic oxidation chamber 4 is under negative pressure, the shape is maintained by the filled cylindrical filter +A7 and damage is prevented.

For example, the sand settling chamber 2 has a diameter DJ of 50 cm and a length Ll of 1.
m, and the internal flow velocity is, for example, 6°7×10'
m/S for 2.5 minutes, and then pass through the wastewater to form a sedimentary SS.
remove.

In the rectifying chamber 3, for example, the height C of the open lj part 3b is 10Cln.
N length L2 is formed to be 50 cm, and the hole 8a rectifies the wastewater flow to the oxidation chamber 4.

The catalytic oxidation chamber 4 has a cross-sectional area D2 of 0,264rIf, for example.
1 Length L3 is formed to 1-0m, and the flow rate of wastewater is 0.5c.
While passing through the wastewater at a temperature of m/S or less and a residence time of 33 minutes, SS is captured and organic matter is oxidized and decomposed to purify the wastewater. However, if the dissolved oxygen concentration of the water flowing out from the outlet L1 section, that is, the rear partition plate 9, is less than i mg/12, the length L3 is shortened so that it becomes less than img/A.

Compared to pumping wastewater from the screen 1 side, the method of suctioning purified water reduces the amount of SS flowing into the device (
Therefore, blockage due to SS accumulation is less likely to occur.

FIG. 3 shows the main part of a second embodiment of the present invention. In this embodiment, the settling chamber 2 is provided with a filtering device 2°. This filtering device 2o is filled with a filtering medium, for example, the same filtering medium 7 as that filled in the contact oxidation chamber 4. This filter medium 7 removes relatively coarse particles before they enter the catalytic oxidation chamber 4.

Here, the filtration device 20 is configured as a so-called attachment, and can be detached from or attached to the sand settling chamber 2 at will.

When installing this filter device 20, it is sufficient to fit the protrusion 22 formed in the sand settling chamber 2 into the recess 24 of the filter device 20. By making it possible to attach and detach the device in this way, the effort required for maintenance and inspection can be greatly reduced.

FIG. 4 shows the main part of a third embodiment of the present invention. When water is sucked into the contact oxidation chamber 4 by the submersible pump 5, microorganisms adhere to the filter medium and purification proceeds by biological action. However, sludge accumulates in the catalytic oxidation chamber 4 as shown by the dotted line in FIG.

On the other hand, according to the third embodiment of the present invention, since the draw-out pipe 30 is provided, the sludge is discharged through the draw-out pipe 30 without accumulating inside the contact oxidation chamber 4. It is. That is, a large number of openings 32... are formed in this pull-out tube 30, and the ends of the pull-out tube 30 are connected to a suction means (not shown).

Therefore, the sludge that has entered the contact oxidation chamber 4 is sucked into the extraction pipe 30 through the opening 32, and
0 and is sucked out of the catalytic oxidation chamber 4 and discharged. If it is necessary to backflow the sludge, the suction means may be removed and a fluid (water or air) suction means may be installed.

FIG. 5 shows an example in which the filtration device 20 is configured to be detachable from the sand settling chamber 2 in the embodiment shown in FIG. That is, the settling chamber 2 and the filtration device 20 have fluid inlets and outlets A1 and A1, respectively.
2 are provided and interconnected by a hose H. This makes it easy to attach and detach both.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to purify wastewater in water bodies such as lakes and marshes where photosynthesis is active and the concentration of dissolved oxygen in the water is relatively high with a small-scale and simple structure. I can do it.

Furthermore, when the dissolved oxygen concentration is low, a known aeration device can be combined to purify the wastewater.

Furthermore, the suction type submersible pump reduces the load on the pump, which is economical, reduces the load on the contact oxidation chamber and prevents damage, and furthermore, allows the device to be installed between the water surface and the bottom, almost along the bottom of the water. It can be set up easily.

In the present invention, by providing a filtration device filled with filtration material in the suction [1], the settling effect is improved, foreign matter is prevented from entering the device, and the maintenance and management of the device is facilitated. .

Further, by providing a sludge drawing pipe in the contact oxidation chamber, disadvantages caused by excessive accumulation of sludge, such as increased water flow resistance, decreased aerobic area, and decreased effective volume, can be prevented.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing one embodiment of the present invention, Fig. 2 is a flow sheet diagram, Fig. 3 is a partially enlarged view showing main parts of a second embodiment of the invention, and Fig. 4 is a diagram of the present invention. FIG. 5 is a partially enlarged view showing a modification of FIG. 3. FIG. Δ... Purification device 1... Screen 2... Sedimentation chamber 3... Rectification chamber 4... Contact oxidation chamber/filter material] Figure 3 Procedural amendment 7゜Contents of amendment (]) Specification No. First, correct "backflow" in line 4 of page 10 to "backwashing." 1゜Indication of requirements Patent application No. 2081, No. 25 2゜Name of the invention Submersible sewage purification device 3゜Name of person making the amendment Representative Tsuyoshi A&D Co., Ltd. 4゜

Claims (1)

[Claims] A submersible sewage purification device characterized in that a screen, a settling chamber, a rectification chamber, a contact oxidation chamber filled with a filter medium, and a suction type submersible pump are arranged in series substantially along the bottom of the water.