JPH10272481A - Treating vessel for contact oxidation of rivers and contact oxidation treating device of rivers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To purify the quality of river water by arraying plural pieces of vessel bodies onto a foundation formed by digging down the river bed from upstream to downstream and effectively absorbing and removing the BODs or SSs in the water with aerobic bacteria by the siphon phenomenon to force the water flow to meander in a vertical direction without requiring aerators and without impairing the natural scene of the rivers. SOLUTION: This treating vessel for contact oxidation of the rivers consists of the vessel bodies 10 of a box shape which have bottom walls 11 and peripheral walls 12 erecting from the circumferences of these bottom walls and are arrayed on the foundation 31 formed by digging down the river bed and are held the opened front surface to the same level as the level of the river bed and block walls 14 which are arranged in the direction of shutting off the flow of the river within the vessel bodies 10, segment the inside of the vessel bodies 10 to upstream chambers 10a and downstream chambers 10b allowing the packing of contact materials 18 with respect to the flow of the rivers and of which the top ends project upward from the opened front surfaces of the vessel bodies 10 and constitute water stopping sections 15. Water flow sections 17 communicating the upstream chambers 10a and the downstream chambers 10b are disposed between the bottom walls 11 of the vessel bodies 10 and the bottom ends of these block walls 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact oxidation treatment tank for aerobically purifying river water and reducing BOD, SS, etc., and a contact oxidation treatment using the treatment tank. Related to the device.

[0002]

2. Description of the Related Art A large number of concrete processing tanks each having a rectangular box shape having a bottom wall and having water passage windows formed on two side walls facing upstream and downstream, respectively, are provided. Lined up according to the width and length of the riverbed so as to face the downstream, filling the inside of each lined processing tank with contact material such as gravel, crushed stone, etc. The water flow that flows into the tank from the water window is treated with aerobic bacteria that adhere to the contact material and proliferate, and flows out from the water passage window facing downstream, thus sequentially passing water into the downstream processing tank, 2. Description of the Related Art A contact-type oxidation treatment apparatus for purifying water by reducing BOD, SS and the like of water has been conventionally known.

[0003]

In the above-described known processing apparatus, the upper surface of each processing tank must be closed with a lid in order to forcibly flow water into each of the processing tanks arranged in line and to come into contact with the contact material. No. Therefore, it is necessary to use a lid corresponding to the number of processing tanks, and this lid impairs the natural scenery of the river. Furthermore, aerobic bacteria that adhere to and propagate on the contact material cannot take in outside air with a lid that closes the upper surface of the processing tank, and lose activity, so an aeration device is arranged upstream of the arranged processing tanks. The aeration device must increase the amount of dissolved oxygen in the water that passes through the treatment tank, maintain the activity of aerobic bacteria that adhere to the contact material and proliferate, and together with the use of the lid, the installation cost Increases. In addition, when cleaning the contact material such as when the contact material is clogged or the adsorption limit is reached, the lid must be removed to remove the contact material from the inside of the treatment tank, and the cleaned contact material or a new one must be removed. After filling the inside of the processing tank with the contact material, the upper surface of the processing tank must be closed again with a lid, which takes a lot of trouble. Furthermore, since a rectangular box-shaped treatment tank having a bottom wall must be provided with a water passage window on each of the side walls facing upstream and downstream, the formwork for molding the treatment tank with concrete becomes complicated. , Poor productivity.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed with the object of solving the above-mentioned problems.
The river's contact oxidation treatment tank has a bottom wall and a surrounding wall rising from the periphery of the bottom wall, and is arranged on a foundation dug down into the riverbed, and the open top surface is kept at the same level as the riverbed A box-shaped tank body and an upstream chamber and a downstream chamber that are arranged inside the tank body in a direction obstructing the flow of the river and that can fill the inside of the tank body with the contact material with respect to the flow of the river. And a partition wall having an upper end protruding upward from the open upper surface of the tank body and serving as a water blocking portion, and an upstream chamber between a bottom wall of the tank body and a lower end of the partition wall. A water passage for communicating with the downstream chamber is provided. Further, the contact oxidation treatment apparatus for rivers according to claim 3 is arranged inside a tank-shaped tank having an open top surface comprising a bottom wall and a peripheral wall rising from the periphery of the bottom wall. And a partition wall having an upper end projecting upward from the open upper surface of the tank body to serve as a water blocking portion, and a partition wall formed of the partition wall and the bottom wall of the tank body. A large number of treatment tanks provided with a water passage that communicates between the two chambers inside the tank body defined by the partition wall between the lower end of the partition wall and the tank body were placed on a foundation dug down the riverbed. So that the upper surface is kept at the same level as the riverbed, the water stop of the partition wall protruding from the upper surface of the tank blocks the flow of the river, and one of the two chambers is located upstream and the other is located downstream. Along the width and length of the riverbed, the contact material is filled inside the two chambers divided by the dividing walls of each of the arranged treatment tanks. .

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The height of a wall parallel to the flow of a river among the surrounding walls rising from the bottom wall of a processing tank arranged on a foundation where a riverbed is dug down, is set higher than other walls. It is also preferable to make the height higher and make it a water guiding part. In addition, two chambers (upstream chamber and downstream chamber) inside the tank body partitioned by the partition wall
It is preferable that the contact material to be filled into the mesh bag is housed in a net bag or the like, and filled in the room as it is housed in the mesh bag, or the mesh bag is pulled out of the room for washing or the like.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In each of the illustrated embodiments, reference numeral 10 denotes a tank body of a processing tank having an open upper surface, which has a bottom wall 11 and a peripheral wall 12 rising from the periphery of the bottom wall, and is made of concrete with reinforcing steel. . The cross-sectional area inside the tank body is slightly reduced and tapered from the open top surface to the bottom wall for convenience of molding.

[0007] On the inner walls of the peripheral wall 12 opposite to each other, vertical grooves 13, 13 are provided opposite to each other at a position where the inside of the tank body is bisected. The partition walls are dropped by fitting both sides of the partition wall 14 into the opposed grooves 13 from above, and the partition wall 14 divides the inside of the tank body into two chambers (an upstream chamber and a downstream chamber).
It is divided into 10a and 10b. The upper end of the partition wall projects upward from the open upper surface of the tank body to form a water stop portion 15. The partition wall 14 may be made of concrete with a reinforcing bar, but may be made of a thick wooden board or a synthetic resin board.

FIG. 1 (C), FIG. 2 (B), FIG.
As shown by the arrow in (B), a water flow section 17 that connects the two chambers 10a and 10b communicates with each other in order to cause a so-called siphon phenomenon in the processing tank to raise the water flow that has descended from the upstream chamber 10a in the downstream chamber 10. To the bottom wall 12 of the tank body and the partition wall 1
4 is provided between the lower end and the lower end.

The two chambers 10a and 10b are filled with a contact material 18, respectively. Gravel, crushed stone, charcoal,
Fibers can be used, but pumice mixed with shirasu, which is widely distributed in the mainland of Kagoshima Prefecture, is also one of the suitable materials. that is,
Pumice has a large porosity and a large surface area, and is amorphous and suitable for the propagation of aerobic bacteria.
This is because it is possible to easily perform an operation of taking up and taking out from the room for filling and washing the room. If charcoal obtained by carbonizing thinned wood or construction waste wood is used as the contact material, the same effect as pumice and the easiness of work can be obtained, and the resource can be saved.

The contact material is divided into a material to be filled into the lower part of the room and a material to be filled into the upper part. Wrap in. Thus, the weight of the upper contact material wrapped in the iron net prevents the contact material wrapped in the lower palm or vinyl net from falling off or flowing out. Of course, the whole contact material to be filled in each chamber may be wrapped with one vinyl net or a corrosion-resistant iron net. When the above-mentioned pumice is used as a contact material, if pumice stones, gravel, crushed stones and the like are placed on the pumice and wrapped, the floating of the pumice can be prevented.

FIG. 1 is a square having a side of 1 m and a depth of 1 m.
1 shows an embodiment of a treatment tank using a tank body 10 having a square planar shape. The inside of the tank body is bisected by partition walls 14 dropped into opposed grooves 13, 13, and two chambers ( (Upstream chamber and downstream chamber) 10a and 10b. The water blocking portion 15 of the partition wall 14 protruding upward from the upper surface of the tank body has ears 16 and 16 projecting to the left and right. The ears are received on the upper surface of the peripheral wall of the tank body, and in this state. The lower end of the partition wall contacts the bottom wall 11 of the tank body. The partition wall 14 has a central leg 14 ′ having a downward length of about 30 cm and a width of 20 cm at the center of the lower end,
Both sides of the central leg 14 serve as water passages 17.

However, the water passage section 17 is not provided on the partition wall 14, and the bottom wall 11 of the tank body with which the lower end of the partition wall 14 comes into contact as shown in the embodiment of FIG. The water passage 17 may be provided below the partition wall.

Also, as shown in the embodiment of FIG.
The length of the left and right ears 16, 16
The lower end of the partition wall is lifted up from the bottom wall 11 of the tank body while the is received on the upper surface of the peripheral wall 12 of the tank body, and is formed between the lower end of the partition wall and the upper surface of the bottom wall. The space may be the water passage section 17.

In any case, ears 16,
When the ear portion is provided so as to be received on the upper surface of the peripheral wall 12 of the tank body, an appropriate inclusion such as a plate piece is sandwiched between the ear portions 16, 16 and the upper surface of the peripheral wall 12. Thereby, it is possible to adjust the height of the upper end of the water stop portion or to increase the cross-sectional area of the water passage portion 17. The height of the water stopping portion 15 protruding from the open upper surface of the tank body is about 10 to 20 cm, which is about the normal depth of water flowing on the riverbed.

Further, as shown in the embodiment of FIG. 4, in the peripheral wall of the tank body, opposed grooves 13,
The height of the wall portions 12a, 12a parallel to the flow of the river having 13 may be higher than the other wall portions 12b, 12b, and the raised portions may be used as the water flow guiding portions 21, 21. By making the upper ends of the water guide portions 21 and 21 and the upper end of the water stop portion 15 of the partition wall 14 have the same level, the ear portions 16 and 16 provided on the left and right of the water stop portion 15 of the partition wall become unnecessary. . When the height of the wall portions 12a, 12a parallel to the flow of the river is increased and the water flow guiding portions 21, 21 are provided in this manner, the water flowing on the riverbed flows from the space between the water flow guiding portions 21, 21 to the upstream chamber 10a. When it collides with the water stop portion 15, it descends in the upstream chamber without overflowing and comes into contact with the contact material 18 in the room, and then contacts the bottom wall of the tank body and the lower end of the partition wall 14. It descends through the water passage section 17 provided therebetween, rises in the downstream chamber 10b while being in contact with the contact material 18, and flows down between the water passage guide sections 21 and 21 from above the downstream chamber. Thereby, the water flow of the river can be rectified by the water guiding portions 21 and 21 (see FIG. 7).

Although the tank body 10 of the processing tank of each embodiment shown in FIGS. 1 to 4 has a square planar shape, it may have a rectangular planar shape or a regular hexagonal honeycomb shape as shown in FIG. Good. In the case of the honeycomb shape, a tank body 10A having a trapezoidal plane shape may be used in combination as needed. Also in this case, the height of the wall portions 12a, 12a parallel to the water flow is made higher than the other wall portions to form the water flow guiding portions 21, 21, and the upper end thereof and the upper end of the water stop portion 15 of the partition wall are the same. The level may be rectified.

The size and depth of the tank body of the processing tank are arbitrary, but it is preferable that the tank has a weight (about 1.5 t) that can be lifted and installed by a small truck crane. Then, in order to be lifted or lowered by a crane, when forming the tank body, a nut 22 welded to a reinforcing bar is embedded and fixed in the upper surface of the peripheral wall 12, for example, at the four corners, and an eye bolt 23 is screwed into the nut after forming. It is preferable that the eyebolt 23 be lifted and suspended using the eyebolt 23, the eyebolt 23 be removed after installation, and the nut 22 filled with mortar, caulking agent, or the like to prevent corrosion.

Further, natural stones are embedded and formed on the upper surface of the water stop portion 15 of the partition wall, the upper surface of the peripheral wall 12 of the tank body, and the upper surface of the water flow guiding portion 21, and when they are installed on the riverbed, It is preferable to harmonize with the surrounding nature.

In order to form a large number of the above-mentioned treatment tanks in a row to form a contact oxidation treatment apparatus for a river, the middle of the riverbed 30 is dug down, and the foundation 31 is cut into the dug bottom with cut gravel or leveling concrete. Form. The depth of the upper surface of the foundation 31 from the riverbed is determined by the water stopping portion 16 at the upper part of the partition wall when the treatment tank is installed on the upper surface of the foundation, and the water guiding portion when the water guiding portion 21 is provided. It is determined so as to protrude upward from the riverbed 30.

When the gradient α from the upstream to the downstream of the riverbed 30 is small, the upper surface of the foundation 31 may have an inclined surface corresponding to the gradient as shown in FIG. or,
When the gradient is large, the upper surface of the base 31 is formed into a stepped shape or a tiered stepped shape that is one step down toward the downstream as shown in FIG. Then, a waterproof sheet pile 32 is driven into the upstream end and the downstream end of the foundation 31 as necessary. When the length of the foundation from the upstream to the downstream (longitudinal direction) is long, the waterproof sheet pile 34 is also provided in the middle. To increase the length of the permeation channel to reduce water leakage and prevent hollowing of the foundation ground.

When the foundation 31 is formed in this manner, one processing tank is lowered and installed with a truck crane or the like on the foundation so that the upstream chamber 10a faces upstream and the downstream chamber 10b faces downstream. , One row or a plurality of rows (three rows in FIGS. 7 and 8) according to the length. At that time, the width direction of the foundation,
In addition, a corrosive elaslite is interposed between the processing tanks adjacent in the longitudinal direction, or the gap between the processing tanks is closed with a caulking material to form a seal 35 to prevent water from entering the adjacent gap between the processing tanks. Preferably, it is prevented. The inside of the upstream chamber 10a and the downstream chamber 10b of each processing tank is filled with the contact material 18. FIGS. 6, 7, and 8 show an example in which the processing tanks having the water passage guiding sections 21 and 21 of FIG. 4 are arranged. Of course, the processing tanks of FIGS. Is also good.

The number of treatment tanks arranged in a row from the upstream to the downstream is determined according to the pollution degree of the river. If the pollution is large, the number is increased, if the pollution is small, the number is reduced, and the length of the base is adjusted to that. . Gabions, cobblestones, and the like between the left and right slopes 36, 36 of the river and the left and right sides 37, 37 in the width direction of the foundation.
It is covered with the covering portions 38, 38 such as cast concrete walls, and the entire amount of water flowing from the upstream to the downstream on the riverbed flows down on the rows of the processing tanks arranged.

As a result, as shown by arrows in FIGS. 6 (A) and 6 (B), the water contacts the inside of the upstream chamber 10a in order from the one located upstream of the treatment tank in each row to the one located downstream. It flows downward in the room while contacting the material 18, flows upward in the downstream chamber 10 b while diving through the water passage 17 and in contact with the contact material, and flows into the upstream chamber of the processing tank on the downstream side. , 1
The BOD component and SS are adsorbed and removed by the aerobic bacteria that adhere to and grow on the contact material when they come into contact with the contact material in Ob. Therefore, from the downstream chamber of the treatment tank located at the most downstream side of each row, treated water having a reduced BOD concentration and SS is discharged onto the riverbed.

[0024]

The treatment tank for contact oxidation of rivers according to the present invention has a box-shaped tank body having an open upper surface, the inside of the tank body is divided into an upstream chamber and a downstream chamber, and the upper part of the tank body has a tank body. It is a water blocking part protruding from the upper surface, the lower end is composed of a partition wall that forms a water passage part with the bottom wall of the tank body, and it is necessary to open a water window etc. on the peripheral wall of the tank body. Because it is not available, it can be easily formed of concrete using a simple structure. Therefore, productivity is very high.

Further, a contact-type oxidation treatment apparatus can be obtained by arranging a large number of the treatment tanks on a foundation dug down in the middle of the riverbed so that the water stop portion blocks the water flow.
According to this contact-type oxidation treatment apparatus, water flows downward through the chamber while sequentially contacting the contact members 18 in the upstream chamber from the one located upstream of the treatment tank in each row to the one located downstream. It flows into the upstream chamber of the downstream processing tank while repeating the siphon phenomenon in which it descends in the water part and contacts the contact material and flows upward in the downstream chamber, and contacts the upstream chamber and the contact material in the downstream chamber while contacting the contact material in the downstream chamber. B to aerobic bacteria that attach to and grow on
The OD component and SS are adsorbed and removed and purified. In particular, since the flowing water flows inside each treatment tank by the siphon phenomenon while contacting with the contact material, the length or time for which the flowing water comes into contact with the contact material is determined by contacting the contact material by flowing straight through the tank. Compared to the conventional type, which is about twice as large per projection area.
The efficiency of removing BOD components and SS is increased, and river water can be purified effectively. Therefore, from the downstream chamber of the treatment tank located at the most downstream side of each row, treated water having a reduced BOD concentration and SS is discharged onto the riverbed. And since the upper surface of each processing tank is open, aerobic bacteria attached to the contact material take in the outside air and increase the activity, so there is no need to install an aeration device upstream, and the upper surface of the processing tank is Since a closing lid is not used, it can be installed at low cost, and the contact material for cleaning can be easily taken out and refilled, and the natural scenery of the river is not spoiled.

[Brief description of the drawings]

FIG. 1A is a plan view of a first embodiment of a processing tank, and FIG.
FIG. 4A is a cross-sectional view taken along line BB of (A), and FIG. 4C is a cross-sectional view taken along line CC of (B).

FIG. 2A is a sectional view similar to FIG. 1B of a second embodiment of the processing tank, and FIG. 2B is a sectional view taken along the line BB of FIG.

FIG. 3A is a sectional view similar to FIG. 1B of a third embodiment of the processing tank, and FIG. 3B is a sectional view taken along the line BB of FIG. 3A.

FIG. 4 is a perspective view of a fourth embodiment of the processing tank.

FIG. 5 is a plan view of another embodiment of the processing tank.

FIG. 6A is a cross-sectional view of a contact-type oxidation treatment apparatus in which treatment tanks are arranged on the foundation of a gentle slope having a gentle downward slope toward the downstream side, and FIG. It is sectional drawing of the contact-type oxidation processing apparatus which arranged the processing tank on the step | stage of a shape foundation.

FIG. 7 is a plan view of the contact oxidation treatment apparatus.

FIG. 8 is an enlarged sectional view taken along line VIII-VIII in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tank body of treatment tank 10a Upstream chamber in tank body 10b Downstream chamber in tank body 11 Bottom wall of tank body 12 Peripheral wall of tank body 13 Groove 14 Partition wall 15 Water stop part of partition wall 16 Ear of water stop part REFERENCE SIGNS LIST 17 water passage part 18 contact material 19 net wrapping contact material 20 iron net wrapping contact material 21 water conduction guide part 22 nut 23 eye bolt 30 riverbed 31 foundation 32 water stop sheet pile 34 intermediate water stop sheet pile 35 seal 36 river slope 37 Foundation side 38 Coating

Claims (4)

[Claims] 1. A box-shaped tank body having a bottom wall and a peripheral wall rising from the periphery of the bottom wall, the box-shaped tank body being arranged on a foundation in which a riverbed is dug down, and having an open upper surface kept at the same level as the riverbed. The inside of the tank body is arranged in a direction obstructing the flow of the river, and the inside of the tank body is divided into an upstream chamber and a downstream chamber that can be filled with a contact material with respect to the flow of the river, and the upper end has A partition wall protruding upward from the open upper surface of the tank body and serving as a water blocking portion, and communicating the upstream chamber and the downstream chamber between a bottom wall of the tank body and a lower end of the partition wall. A treatment tank for contact oxidation of rivers, characterized by having a water passage section. 2. The processing tank for contact-type oxidation of river according to claim 1, wherein:
A treatment tank for contact oxidation of rivers, characterized in that the height of the wall parallel to the flow of the river is higher than the other walls and is used as a flow guiding part. 3. A box-shaped tank body having an open top surface comprising a bottom wall and a peripheral wall standing upright from the periphery of the bottom wall, and the inside of the tank body arranged in the tank body into two chambers. A partition wall having an upper end protruding upward from an open upper surface of the tank body to form a water stop portion, and a partition wall between the bottom wall of the tank body and the lower end of the partition wall. A large number of treatment tanks provided with water passages connecting the two chambers inside the tank body separated by walls were placed on a foundation dug down in the riverbed, and the upper surface of the tank body was kept at the same level as the riverbed. The water stop of the partition wall protruding from the upper surface of the tank blocks the flow of the river, and the two chambers are arranged according to the width and length of the riverbed so that one of the two chambers is located upstream and the other is located downstream. A contact oxidation treatment apparatus for rivers, wherein a contact material is filled in two chambers partitioned by partition walls of each treatment tank arranged in a row. 4. The river contact oxidation treatment apparatus according to claim 3, wherein, of the peripheral walls rising from the periphery of the bottom wall of each treatment tank arranged on the foundation, a wall parallel to the flow of the river. A contact oxidation apparatus for rivers, characterized in that the height of the section is higher than the other wall sections and the section is a water flow guide section.