JP2873387B2 - Closed water purification facility - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a purification facility for seawater, river water, lake water, etc., which is suitable for purifying closed water bodies.

"Prior art" The present inventors have previously proposed in Japanese Patent Application No. 1-137298 a facility suitable for purifying seawater in a port or the like.

FIG. 4 shows a purification facility proposed by the inventors. In this purification facility, a caisson 1 in the form of a gravity type breakwater is filled with gravel 2... As a contact material. At the upper part of the caisson 1, there is provided a multi-cell type water guide section 3 composed of a large number of curved water passages opened on the front side and the top side of the caisson 1. The opening on the front side of the water guiding section 3 is an inlet 4 for seawater, and the opening on the top side is a spout 5. Behind the jet port 5, an upper intake port 6 for taking in the seawater spouted from the jet port 5 into the caisson 1 is formed. The upper intake port 6 is provided at a position higher than the high tide level. At the lower part of the caisson 1, there are formed outlets 7 for drawing seawater that has passed through the caisson 1 to the sea area behind.

In this purification facility, the seawater in the front sea area flows into the water guide section 3 from the inflow ports 4. The seawater that has flowed into the water guide section 3 is curved upward in the traveling direction and is blown upward from the blow-up port 5, thereby being aerated and the dissolved oxygen being increased. The seawater aerated in this way. The caisson 1 enters the caisson 1 through the upper water intake 6 and is aerobically purified by microorganisms attached to the surface of the gravel 2. The purified seawater flows out from the outlet 7 to the rear of the caisson 1.

[Problems to be Solved by the Invention] In the purification facility proposed above, a large amount of microbial membranes is held by the wide surface formed by the pebbles 2, and an extremely high water purification effect can be expected.

However, since the amount of seawater entering the caisson 1 fluctuates depending on the strength of the waves in the purification facility, if a predetermined sea area is partitioned from the surrounding sea area to form a closed sea area using this purification facility, the amount of seawater that can be taken into the closed sea area Becomes extremely unstable, and when the waves are calm, there is a concern that the intake of seawater may be insufficient. There was also a lack of stability regarding the ability to purify closed sea areas.

The present invention has been made in view of the above-mentioned circumstances, and a purification facility for closed water bodies capable of stably taking water in surrounding water bodies into closed sea areas and maintaining good water quality in closed water areas. The purpose is to provide.

"Means for Solving the Problems" The purification facility for closed water bodies of the present invention is a partition wall that separates an internal water area from a surrounding water area behind a breakwater having an upper intake at a height higher than the high tide. The breakwater and the partition wall are filled with a contact material to which microorganisms can adhere, and the partition wall between the breakwater and the partition wall is provided with a communication hole located at a low tide or lower, and the partition wall is formed. A treated water outlet located at a low tide level and below the middle tide level is drilled in the wall on the inner water body side of the dike, and a direct intake part that takes in water from the surrounding water area directly from the surrounding water area to the inside of the dike is at high tide. Below, it is provided intermittently at a position above the middle tide level.

Here, the closed water area includes not only an internal water area completely separated from the surrounding water area, but also an internal water area partially connected to the peripheral water area in a state where the water level can be controlled.

Examples of the contact material include shells such as oysters, plastic molded articles such as corrugated sheets, inorganic molded articles such as concrete blocks, gravel, crushed stones, crushed stones, and other materials that can grow microbial membranes such as boulders. Available.

Here, the medium tide level indicates a height position that is half the sum of the average high tide level and the average low tide level.

The purification facility for closed water bodies may be provided with a separate discharge path for discharging water from the internal water bodies to surrounding water bodies. Then, it is preferable to control the water level of the internal water area so as to fluctuate within the range of the ebb and tide level of the surrounding sea area centering on the middle tide level.

The discharge passage may be provided with an electromagnetic valve so that seawater in the closed water area can be discharged at an appropriate time and for an appropriate time. The discharge rate from the discharge channel is controlled by the water level difference between the internal water area and the surrounding water area, the release time of the discharge channel, etc.In controlling, the desired seawater exchange rate, tide level fluctuation pattern, It is necessary to consider the internal production and self-decomposition of pollutants, the purification capacity of the purification facility, and the balance of sludge load.

At the time of the control, at least one of transparency (transparency), chemical oxygen demand (COD), salt concentration and the like of the closed water area is used as an index so that the value falls within a predetermined range. It is desirable to control the seawater exchange rate by adjusting the opening time zone and opening time of the discharge channel.

"Action" In the closed water purification facility of the present invention,
When the water level in the surrounding water area rises and reaches a predetermined height equal to or higher than the middle tide level, the seawater in the surrounding water area flows into the partition embankment provided behind the breakwater via the direct water intake section. Then, the water is purified by microorganisms attached to the contact material in the partition, and then flows out to the internal water from a treated water outlet provided in a wall on the internal water side of the partition.

On the other hand, seawater to which dissolved oxygen added into the breakwater from the intake at the top of the breakwater due to wave energy is purified by microorganisms that have grown on the surface of the contact material in the breakwater, and then the breakwater and the partition wall It flows into the partition embankment through the communication hole of the partition between them. Thereafter, the seawater is purified by microorganisms in the partition embankment, and flows out from the treated water outlet into the internal water area.

As described above, in the purification facility of the present invention, the seawater in the surrounding water area is taken into the internal water area by the energy due to the tidal level in addition to the wave energy. Therefore, according to the purification facility of the present invention, the seawater in the surrounding water area is efficiently closed. Can be taken into sexual waters.

"Example" Hereinafter, a purification facility for closed water bodies of the present invention will be described in detail with reference to the drawings. The same components as those of the conventional example are denoted by the same reference numerals, and the description will be simplified.

1 to 3 show an embodiment of a purification facility for closed water bodies according to the present invention, wherein reference numeral 10 denotes a breakwater.
The breakwater 10 is formed by caissons 1 used in the conventional purification facility.

Behind the breakwater 10, a partition wall 13 that partitions the internal sea area 11 and the surrounding sea area 12 is provided continuously. The inside of the partition wall 13 is filled with gravel 2.

In the partition wall 14 between the partition wall 13 and the breakwater 10, communication holes 15 communicating with each other are formed. The communication holes 15 are provided at positions below the low tide level A. A treated water outlet 17 through which seawater treated in the purification facility flows out is formed in the wall 16 on the inner sea area 11 side of the partition wall 10. This treated water outlet 17 ...
It is provided at a position below the middle tide level B.

Further, in this purification facility, there are provided three direct water intake portions 18 for directly taking in outside seawater from the surrounding sea area 12 into the partition wall 10 through the breakwater 10. This direct water intake section 18…
It is provided at a position below the high tide level C and above the middle tide level B.

The treated water outlets 17 are provided at positions displaced in the horizontal direction with respect to the direct water intake portions 18 and the communication holes 15.

In addition, this purification facility uses seawater from the inner sea area 11
A discharge path is provided for discharge to 12 (not shown). The discharge port is provided with an electromagnetic valve so that seawater in the internal sea area 11 can be discharged at a desired timing.

At the time of high tide, this purification facility in closed water
When the water level rises and reaches a predetermined height, as shown by the arrow in FIG. 1, the surrounding sea area 12 passes through a direct water intake section 18 provided at a height below the high tide level C and above the middle tide level B. Of seawater flows directly into the partition wall 13. The microorganisms living on the surface of the pebbles 2 are purified while falling down the partition wall 13, and then flow out from the treated water outlet 17 of the wall 16 into the internal sea area 11.

On the other hand, as indicated by the arrow in FIG. 2, seawater that has entered the breakwater 10 from the upper intake 6 of the breakwater 10 due to the wave energy flows in the breakwater 10 in the extension direction of the breakwater. The rubble 2 descends and is purified by microorganisms living on the surface of the breakwater 10, and then flows into the partition wall 13 through a communication hole 15 provided in a partition 14 between the breakwater 10 and the partition wall 13. After flowing through the partitioning levee 13 in the direction of extension of the levee and ascending and being purified by microorganisms, the treated water outlet 17 passes through the inner sea area 11
Leaks to

Thus, in this purification facility, since the seawater in the surrounding sea area 12 is taken into the inner sea area 11 by the energy due to the tidal level in addition to the wave energy, it is possible to sufficiently take in the seawater into the inner sea area 11 even on a weak wave day, Surrounding sea area 12
It is possible to stabilize the amount of seawater that can be taken into the internal sea area 11 from the sea.

In this purification facility, the upper intake port 6 of the breakwater 10 is provided at a height higher than the high tide level C, and the communication hole 15 of the partition wall 14 between the breakwater 10 and the partition wall 13 is lower than the low tide level A. And the treated water outlet of the wall 16 on the inner sea area 11 side of the partition wall 13
17 is provided at a low tide level A or higher and a middle tide level B or lower,
Since the direct water intake section 18 for directly taking in outside seawater from the surrounding sea area 12 to the inside of the partition wall 13 is provided at a position lower than the high tide level C and higher than the middle tide level B, the seawater flowing from the upper intake port 6 is subjected to the breakwater 10. It flows down in the direction of extension of the levee and descends, and then rises while flowing in the partition levee 13 in the direction of extension of the levee, and then flows out of the treated water outlet 17 into the internal sea area 11, while being taken in directly from the water intake section 18. The seawater descends while flowing in the breakwater 10 in the direction of extension of the breakwater, and then flows out from the treated water outlet 17 into the internal sea area 11. Therefore, in this purification facility, the seawater taken in from the upper intake port 6 and the seawater taken in directly from the intake section 18 come into contact with the microorganisms grown on the surface of the pebbles 2 for a long time and are sufficiently purified. Can be kept good.

In the above-mentioned embodiment, an example in which the inlet is partitioned by the purification facility is described. However, the purification facility of the closed water area according to the present invention can be used also for an estuary weir partitioning an estuary.

[Effect of the Invention] As described above, the enclosed water purification facility of the present invention is provided with a partition for separating the internal water area and the surrounding water area behind a breakwater having an upper intake at a height higher than the high tide. A breakwater is continuously provided, the inside of the breakwater and the partition wall is filled with a contact material to which microorganisms can adhere, and a communication hole located at a low tide level or lower is formed in a partition wall between the breakwater and the partition wall, A treated water outlet located at a low tide level or higher and a lower level than the middle tide level is bored in the wall on the side of the internal water area of the partition, and the direct intake section that takes in water from the surrounding water area directly into the partition wall from the surrounding water area. This facility is provided intermittently at a location below the middle tide level and above the middle tide level.

In the closed water purifying facility of the present invention having such a configuration, at the time of high tide, when the water level of the surrounding water area rises and reaches a predetermined height, the seawater in the surrounding water area is directly disintegrated by the breakwater. Flows into the partition wall provided on the rear side of. After being purified within the partition, the water flows into the internal water area.

On the other hand, seawater that enters the breakwater from the intake above the breakwater due to the wave energy is purified in the breakwater, flows into the partition, is purified again, and is drawn out from the treated water outlet to the internal water area. I do.

As described above, in the purification facility of the present invention, the water in the surrounding water area is taken into the internal water area by the energy due to the tidal level in addition to the wave energy. It is possible to stabilize the amount of water taken into a sexual water area.

Further, in the purification facility of the present invention, the upper intake of the breakwater is provided at a height higher than the high tide level, and the communication hole of the partition wall between the breakwater and the partition wall is provided at a position lower than the low tide level. The treated water outlet on the wall on the side of the internal water area is located at a low tide level or higher and a middle tide level or lower, and the direct intake section that takes in water from the surrounding water area directly into the partition wall from the surrounding water area is below the high tide level.
Since the seawater is located at the middle tide level or higher, the seawater flowing in from the upper intake descends in the breakwater and then rises in the partition, reaches the treated water outlet, while the seawater taken in from the direct intake is After descending inside the breakwater, it reaches the treated water outlet. Therefore, in the purification facility of the present invention, the seawater taken in from the upper intake port and the seawater taken in directly from the intake section flow in the extension direction of the levee, and are also guided in the vertical direction, and the microorganisms that grow on the surface of the contact material and the length of the microorganism. Since the water is sufficiently contacted for a long time, the water quality in the internal water area can be kept good.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 show an embodiment of a purification facility for closed water bodies according to the present invention. FIG. 1 is a sectional view taken along the line II in FIG. FIG. 2 is a sectional view taken along the line II-II in FIG. 3, FIG. 3 is a plan view, and FIG. 4 is a perspective view showing a purification facility previously proposed by the present inventors. A: Low tide, B: Medium tide, C: High tide, 2 ...
Gravel (contact material), 6 ... Upper intake, 10 ... Breakwater, 11 ...
… Inner sea area, 12 …… Surrounding sea area, 13 …… Partition embankment, 14 ……
Partition wall, 15: communication hole, 16: wall, 17: treated water outlet, 18, direct water intake

Claims (1)

(57) [Claims] Claims: 1. A breakwater that separates an internal water area from a surrounding water area is provided continuously behind a breakwater having an upper intake at a height equal to or higher than a high tide level. A contact material to which microorganisms can adhere is filled, a communication hole located below the low tide level is formed in the partition wall between the breakwater and the partition wall, and a low tide level and a middle tide level are formed in the wall on the internal water body side of the partition wall. The following treated water outlets have been drilled, and the direct water intake that takes in the water from the surrounding water area directly into the partition from the surrounding water area has been intermittently provided at a position below the high tide level and above the medium tide level. A closed water purification facility characterized by: