JP3042695B2 - Submersible sewage treatment equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an underwater-type sewage treatment apparatus used for purifying water bodies in lakes and marshes where photosynthesis is active and the concentration of dissolved oxygen in water is relatively high.

[Prior Art] Various methods have been proposed for river purification. As one of the methods, Japanese Unexamined Patent Publication No. 60-94195 discloses that, based on the location conditions of a river, a riverbed is dug down, a sand settling tank and a filter bed are installed in series, and a catalyst and an adsorbent are provided on the filter bed. A technology has been released that introduces and flows river water into this area, promotes the capture of oxygen in the air by the flow of water, and performs the catalytic oxidation treatment of river water before it flows out of the filter bed. ing. However, this technology involves digging down the riverbed to install a series of immersion filter beds filled with a sand settling tank, catalyst and adsorbent, which requires large-scale construction and has the disadvantages of blocking river flow. is there. In addition, when the water level is low and the flow is small during the drought season, water is stagnated in the sand settling tank or the immersion filter bed, and it is difficult to increase the dissolved oxygen concentration by contact with air.

As another method, there is an aeration method in which air is sent into sewage to be treated and the sewage and air are forced into contact. The aeration method includes a full aeration method and a partial aeration method. In the full aeration method, oxygen is supplied to the entire filter medium by aerating the entire bottom surface of the filter medium. On the other hand, in the partial aeration method, only a part of the aeration tank is aerated to generate a swirling flow, thereby supplying oxygen to the entire tank.

However, for pollution present on the water surface such as lakes or large rivers where the basin area is large and the flow velocity is relatively slow,
Treatment by conventional methods, such as aeration, was very inefficient. In other words, if it is desired to aerating a lake or a large river, a very large-scale and complicated structure is required, and the cost becomes enormous. . On the other hand, in the case of partial aeration, the amount of water to be treated is very large because lakes, marshes, large rivers, and the like have a large amount of water. On the other hand, the filling amount of the filter medium is small, which is not effective.

However, it is known that in lakes and the like, the photosynthesis is active and the dissolved oxygen concentration in the water is relatively high.

[Problems to be Solved by the Invention] The present invention provides a small-scale and simple-structured underwater-type sewage treatment apparatus for purifying sewage in a water area in which photosynthesis such as lakes and marshes is active and the dissolved oxygen concentration in water is relatively high. It is an object.

[Means for Solving the Problems] According to the underwater type sewage treatment apparatus of the present invention, in an underwater type sewage treatment apparatus used for purification of a water area in which photosynthesis is active in lakes and the dissolved oxygen concentration in water is relatively high. The submersible sewage treatment apparatus is configured integrally with a submersible pump, a flow regulator, a sand settling chamber, a rectifying chamber, and a contact oxidation chamber arranged in series, and the submersible pump has a screen-shaped cover on the suction side and has a screen-shaped cover on the discharge side. A first conduit communicating with the sand settling chamber, wherein the flow regulator is connected via a second conduit of a branch conduit provided in the first conduit; A second pipeline configured to control a flow rate of sewage from the first pipeline to the sand settling chamber and to discharge sewage from the second pipeline to the surface of the water; To remove sedimentary solids and to guide sewage to the rectification chamber. Composed,
The rectification chamber is connected to the contact oxidation chamber via a porous partition plate provided downstream of the rectification chamber, and the contact oxidation chamber has a front part formed by the front partition plate and a rear part formed with a plurality of holes. A large number of filter media are arranged in the room defined by a rear partition plate.

As the filter medium to be filled in the contact oxidation chamber, any material known in the art can be used.For example, a large number of cylindrical bodies obtained by removing the bottom of a container having the trade name of Yakult are densely assembled and at random. It is preferable to configure with the arrangement.

Further, the cross-sectional area and length of the contact oxidation chamber are preferably determined so that the concentration of dissolved oxygen at the outlet is 1 mg / liter or more.

Further, the contact oxidation chamber may be defined by providing a perforated partition plate at the front and rear edges of a tube made of vinyl chloride, or may be formed by bundling a number of small diameter pipes. Then, instead of the perforated partition plate, the vinyl chloride cylinder may be partitioned by a wire mesh.

[Operation] In the underwater type sewage treatment apparatus configured as described above, a part of the sewage discharged from the submersible pump is jetted out of the flow rate regulator, flows into the sand settling chamber at a predetermined flow rate, and enters the sedimentation solids. The object SS is removed. Next, it is rectified in the rectification chamber and flows into the contact oxidation chamber. The SS is effectively captured by the filter medium of the cylindrical body, and the organic matter is oxidized and decomposed to be purified and discharged.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the processing apparatus generally indicated by the symbol A is provided between the water surface WL and the water bottom WB of a water area in which photosynthesis such as lakes is active and the dissolved oxygen concentration in the water is relatively high, and the legs 12a to 12b. 12c
Is provided along the water bottom WB through the
A buoy (floating sign) 14 serving as a mark is provided via the. However, the legs 12a to 12c are not necessarily indispensable, and may be installed directly on the water bottom without providing the legs as shown in FIG.

Referring again to FIGS. 1 and 2, in this apparatus, a submersible pump 1, a flow controller 2, a sand settling chamber 3, a rectification chamber 4, and a contact oxidation chamber 5 are arranged in series. The submersible pump 1 includes:
It is connected to a land-based power supply (not shown) via an electric wire 19 (FIG. 3), and discharges sewage to the first pipeline 10 from which dust and the like have been removed by a screen-shaped cover 1a.

The flow controller 2 is attached via a second pipe 11 of a branch pipe provided in the first pipe 10 to adjust the flow rate to the sand settling chamber 3 and to display the arrow mark on the water surface WL. As described above, the concentration of dissolved oxygen in the water area to be treated is increased by ejecting water and bringing it into contact with air, and the operating state of the apparatus A can be confirmed by the ejected water.

The sedimentation chamber 3 is configured to settle and remove the sedimentable solids (SS) in the sewage flowing from the first pipe 10.

The rectification chamber 4 is separated by the sedimentation chamber 3 and the partition plate 4a to the opening 4b, and the sewage flowing from the opening 4b is
The flow is rectified by passing through a hole 8a of a front partition plate 8, which will be described later.

The contact oxidation chamber 5 is defined by a front partition plate 8 and a rear partition plate 9 in which a vinyl oxide tube 6 is filled with a filter medium 7, and front and rear portions are formed with holes 8a and 9a large enough to prevent the filter medium 7 from protruding. Have been. The filter medium 7 is an arbitrary one according to a known technique. For example, it is preferable that the filter medium 7 is formed by densely assembling a large number of cylindrical bodies from which the bottom of a container with the trade name of Yakult is removed, and disposing them at random. This effectively traps suspended solids (SS) in sewage, maintains an aerobic biofilm, and performs oxidative decomposition of organic matter.

 Next, the operation will be described.

The submersible pump 1 has a capacity of, for example, 2.5 L / S, but discharges 1.75 L / S of sewage because there is a 30% loss due to water resistance.

The flow rate regulator 2 has a predetermined water treatment amount of the device A of, for example, 1.32.
In the case of liter / S, 0.43 liter / S of water is spouted to adjust the flow rate to the sand settling chamber 3.

The sedimentation chamber 3 is formed, for example, with a diameter D1 of 50 cm and a length L1 of 1 m. The internal flow velocity is set to, for example, 6.7 mm / S, and the sediment is passed through in 2.5 minutes to remove the precipitated SS.

The rectification chamber 4 has, for example, a height C of the opening 4b of 10 cm and a length L2.
Is formed at a depth of 50 cm, and the flow of sewage to the oxidation chamber 5 is rectified by the holes 8a.

The contact oxidation chamber 5 has, for example, a cross-sectional area D2 of 0.264 square m and a length L3 of 10 m, and captures organic matter while passing wastewater at a flow rate of 0.5 cm / S or less with a residence time of 33 minutes. To purify sewage by oxidative decomposition. However, the dissolved oxygen concentration of the water flowing out of the outlet part, that is, the rear partition plate 9 is 1 m.
If it is less than g / liter, shorten the length L3 so that it becomes 1 mg / liter or more.

FIG. 3 shows a state in which the embodiment described in FIGS. 1 and 2 is actually installed on the water bottom.

In FIG. 3, the legs 12a to 12c are not provided,
It is installed directly on the underwater WB. In FIG. 1, the submersible pump 1 and the cover 1a are located above the water bottom WB, but in FIG. 3, the submersible pump 1 and the cover 1a are also directly installed on the water bottom WB. In addition, the sand setting chamber 3 has an outer wall made of a transparent material, and is configured to be visible from the outside.

Others are the same as those described with reference to FIG. 1, and thus redundant description will be omitted.

[Effects of the Invention] The functions and effects of the submersible sewage treatment apparatus of the present invention are listed below.

(A) Since it is configured as described above, it is possible to purify sewage in a water area with a relatively small and simple structure in which photosynthesis such as lakes and marshes is active and the dissolved concentration in water is relatively high.

(B) When the dissolved concentration in water is low, a known air diffuser can be combined to purify sewage.

(C) Since the present submerged sewage treatment apparatus is manufactured in advance at a factory, there is no need to perform underwater work in an installation place such as a river or to block a flow of a river, and installation is easy.

(D) If the floor is provided and installed, the installation position is not limited because it can be installed horizontally and at an arbitrary depth even in a place where the water bottom is not flat.

(E) Since the present underwater-type pollution treatment device is integrated into one device, it can be relocated as needed and can be raised for repair.

(F) With the screen-shaped cover provided in the submersible pump, there is no inflow and accumulation of foreign matter such as dust into the apparatus, and there is no damage to the filled filter medium, so that the period of regular cleaning and the life of the filter medium can be extended.

(G) Since the flow rate regulator can control the flow rate of sewage water after the sedimentation chamber, the dissolved oxygen concentration of the water discharged from the apparatus can be adjusted to, for example, 1 mg / liter according to the functional capacity of the apparatus.

(H) Since the water is constantly spouted and sprinkled on the water surface by the flow regulator, it can be judged from the outside that the device is operating normally.

(I) By spouting water onto the water surface by the flow controller,
Even if the residual oxygen concentration in the water area is low, the dissolved oxygen concentration can be increased by contact with air, and continuous operation is possible regardless of the season and time.

[Brief description of the drawings]

1 is a vertical sectional view showing one embodiment of the present invention, FIG. 2 is a flow sheet diagram, and FIG. 3 is a perspective view showing a state where the embodiment of the present invention is actually installed. A: Treatment device, 1: Submersible pump, 2: Flow regulator, 3: Rectifier, 5: Contact oxidation chamber, 7: Filter material

Continuation of the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) C02F 3/02-3/10 C02F 3/14-3/26 C02F 7/00

Claims (1)

(57) [Claims] 1. A submersible sewage treatment apparatus used for purifying a water area in which photosynthesis is active in a lake and the concentration of dissolved oxygen in water is relatively high, said submersible sewage treatment apparatus comprising a submersible pump, a flow regulator, a sand settling chamber, A rectifying chamber and a contact oxidation chamber are arranged in series and integrally formed, and the submersible pump includes a screen-shaped cover on a suction side and a first conduit communicating with the sand settling chamber on a discharge side. Of the branch line provided in the line
The flow regulator is connected through a pipeline of the above, and the flow regulator regulates the flow rate of sewage from the first pipeline to the sedimentation chamber and ejects sewage from the second pipeline onto the water surface. And the sedimentation chamber is configured to precipitate and remove sedimentable solids in the sewage from the first conduit and guide the sewage to the rectification chamber, and the rectification chamber is provided downstream of the rectification chamber. The contact oxidation chamber is connected to the contact oxidation chamber via a partition plate having a plurality of holes formed therein, and the contact oxidation chamber is a rear partition plate having a front portion with the front partition plate and a rear portion with a plurality of holes formed. An underwater type sewage treatment apparatus, wherein a large number of filter media are defined in the room.