JPH06226288A - Purifying method for static stagnating water of lake or pond and purifying device used for the same - Google Patents

Abstract

PURPOSE:To obtain purification efficiency with high water quality by floating floating structures planted with aquatic plants in the desired position in the static stagnating water system of a lake, pond, etc., and forcibly circulating and passing the water of the stagnating water system to these floating structures while bringing the water into contact with the plated plants. CONSTITUTION:The floating structure 1 is constituted by providing a water path part 3 in common use as a planting bed between a pair of right and left buoyancy generating parts 2 and 2, planting the aquatic plant groups 4 in this water path part in common use as the planting bed and providing a water feed means 5 capable of forcibly feeding the water to the aquatic plant groups 4. Plural pieces of these floating structural bodies 1 are successively provided in a longitudinal direction, by which a connecting unit of, for example, 30m overall length is constituted. This unit is floated on a water surface BL of the pond, etc. The water path parts 3 in common use as the planting beds are formed by using, for example, U-pipes and are provided with soil layers 8 consisting of gravel layers 8a, sand layers 8b and gravel layers 8c to provide a filter medium effect as well in their bottoms. The aquatic plant groups 4 are planted to these soil layers 8. The water feed means 5 is constituted to have a pump 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying and preserving the water quality of a water system in which water is statically accumulated such as lakes and ponds, and particularly to a method for purifying water using aquatic plants and its use. Purification device

[0002]

2. Description of the Related Art Regarding the purification capacity of aqueous plants for BOD components and eutrophication components such as nitrogen and phosphorus in polluted water, many experimental results and experimental results have already been reported. On the basis of this, various methods have been proposed in which aquatic plants are used for restoration and conservation of water quality in a stationary stagnant water system such as lakes and ponds, or purification treatment of domestic wastewater.

However, many problems still remain with respect to the method of practically utilizing an aqueous plant as a functional element of a purification facility. It is considered that this is greatly affected by various restrictions imposed because the plant is a part of nature. For example, floating plants such as water hyacinth are expected to have a particularly excellent purification ability in terms of their reproductive ability and absorption rate of nitrogen and phosphorus, and they are proliferated in an appropriate enclosure structure provided in a lake to make them stationary. Has already been proposed for the purpose of water purification and conservation of statically accumulated water systems.
However, as a practical problem, there is still a big problem in collecting the dead bodies and management due to the seasonality of the activity, and it has not been put to practical use.

A method has also been proposed in which an artificial waterway leading to a lake or the like is formed, and purification is carried out by the aqueous plants propagated in this waterway, but this method requires a large-scale civil engineering work. In addition, there are drawbacks such as the possibility of damaging the landscape and the natural environment, and there are still problems in practical application.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is less troublesome to collect dead bodies and manage them due to seasonal variations. For the purpose of providing a purification method and a purification device therefor, which is a purification method capable of more effectively exerting the water purification / conservation function possessed by the microbial groups that perform There is.

[0006]

According to the purification method of the present invention, a floating structure, in which an aqueous plant is planted, is floated at a desired position in the stationary retention water system, and the floating structure is subjected to the stationary retention water system. This water is forced to circulate while contacting the plants on the floating structure.

According to the method of the present invention, since the purifying device can be easily installed and moved to a desired position, the purifying efficiency can be maximized in a water system in which different water quality parts are mixed such as a lake and a large pond. Purification can be performed at the site where it can be obtained, and therefore high purification efficiency can be expected.

Further, according to the method of the present invention, various kinds of aquatic plants can be used in the same condition as in the natural waterfront. In other words, this method forms artificial "watersides" at the most suitable positions for purification, and has an excellent purification function of plant groups cultivated by the environment unique to "watersides" and microbial groups that coexist there. Can be used more effectively. Specifically, absorption and removal of nitrogen and phosphorus by aqueous plants, decomposition and removal of BOD components and the like by microorganisms that have settled on the stems and roots of aqueous plants, filtration effects of suspended matter by the stems and roots of aqueous plants, and by aqueous plants Purification is performed by supplying oxygen, etc., and the supply of oxygen by forced circulation of water also contributes to purification.

Further, according to the method of the present invention, aquatic plants and microorganisms for purification act as an ecosystem closed on a floating structure, so that recovery of dead bodies and management associated with seasonal fluctuations are performed. It's much less troublesome.

Further, according to the method of the present invention, civil engineering work is unnecessary, and the influence on the natural environment is hardly caused. Furthermore, this method can naturally function even when there is a change in the water level, and thus can function more stably.

The method according to the invention mainly comprises reeds, cattails,
It is preferable to use an appropriate combination of extracted plants such as mackerel, kohone, poppy, watercress, floating plants such as seri, sasabana, shrimp, and submerged plants such as dada, and it is particularly preferable to mainly use floating plants. .

[0012] That is, the leaf-fed plant has a life form in which roots are laid in the ground while leaves are floated on the water from the tip of the stem extending in water, and the roots and stems form an epiphytic substrate more suitable for the growth of microorganisms. Since it also provides nitrogen and phosphorus as nutrients directly from the water, a more efficient purification function can be expected. On the other hand, this floating leaf plant has a condition of suitable water depth, and this point becomes a problem, but in the method of the present invention, it is easy to set the optimum water depth condition, and moreover, the water level may be changed as described above. Since it is not present, it is easy to give and maintain the optimum conditions for the growth of the floating plant, and thus it is possible to exert its function more efficiently.

In the cleaning method according to the present invention, if a plurality of floating structures are connected to each other to form a connecting unit and the connecting unit is floated at a desired position, the size of each floating structure is too large. It is preferable because it does not have to be a thing.

Further, in the purification method according to the present invention, it is possible to provide a filter medium zone in which an appropriate filter medium is filled in a part of the water passage of the floating structure or a part of the water passage of the floating structure of the connecting unit. By combining the treatment with the filter medium zone with the treatment with the aqueous plant group, a combined treatment can be realized and a more efficient treatment can be realized. In particular, if a material having a high deodorizing ability such as zeolite or charcoal is used as the filter medium, it is suitable for a pond or a moat in a place where many people gather, such as a park.

The purifying apparatus used in the above method has a pair of left and right buoyancy generating parts to which a buoyancy member is assembled, a plant floor and a waterway part formed in an elongated groove structure with a soil layer laid on the bottom thereof. Water supply to forcibly circulate water through the soil layer of the plant floor and waterway by pumping up the water in the soil layer of the plant floor and waterway and the water in the static retention water system. And means.

[0016]

EXAMPLE An example of the present invention will be described below. This example is an example designed on the premise of water purification and conservation of a pond having an area of about 2 ha and a water amount of about 70,000 m ³ , and is shown in FIG.
The floating structures 1 as shown in FIG. 3 are connected so that the total length is about 30 m, and the floating structures are floated in the pond B as one connecting unit FU as shown in FIG.

The floating structure 1 includes a pair of left and right buoyancy generating portions 2,
The main elements are 2, a planting floor and water channel 3, an aqueous plant community 4, and a water supply means 5, which are formed in a box shape having a length of 4 m, a width of 2 m, and a height of 1 m.

The buoyancy generating section 2 is formed by using a floating block 6 made of expanded polystyrene as a buoyancy member, and the floating block 6 is covered with a thin cover 7 for protection.
The buoyancy generated by the buoyancy generating unit 2 is set so that the water level in the planting floor / water channel section 3 described later is slightly higher than the water level BL of the pond.

The planting floor and waterway section 3 has two buoyancy generating sections 2, 2
It is formed in a state where both sides are surrounded by, and in this example, it is formed by using a U-shaped tube having a depth of 70 cm and a width of about 90 cm, and at the bottom thereof, a gravel layer 8a, a sand layer 8b and a filter medium. About 25 soil layers 8 consisting of gravel layer 8c that also has an effect
It is laid with a thickness of about cm and is 25 cm above this soil layer 8.
It is made possible to pass water at a certain depth. Both ends of this planting floor / water channel part 3 are closed by end plates 9, but one end plate 9 has an outlet port 10 through which water flowing through the planting floor / water channel part 3 can flow. It is supposed to return to the pond.

The aquatic plant community 4 is mainly composed of floating leaf plants 4f such as kohone and poppy in the soil layer 8 and drained plants 4e such as reeds and macomo, and submerged plants 4 such as sasabana and shrimp.
It is formed by planting s in an appropriate composition.

The water supply means 5 is for pumping the water of the pond from a desired depth position and supplying it to the planting floor / water channel part 3. The water supply means 5 is a pump 11 provided in a suspended state at a position submerged in water. The pumped water is supplied through the water supply pipe 12 to the planting floor / water channel 3 with a certain drop height. When the supply amount is about 5 liters / minute and the length is 30 m, the residence time in the planting floor / canal part 3 is about one day.

The floating structure 1 may be entirely assembled on land in advance, but in the case of a considerably large pond or lake as described above, it is convenient to use the following assembly method. Is. That is, first, the buoyancy generator 2
And assemble the intermediate structure up to the planting floor and waterway part 3 on land. Next, this is put on a floating dog for work which is floated in a pond in advance by using a crane or the like. Then, the floating dog was used as a work place, and the soil layer 8
Then, the aqueous plant community 4 is planted, and the water supply means 5 is further assembled.

The floating structures 1 thus sequentially formed are connected to form a connecting unit having a total length of about 30 m. When one connecting unit is completed, the buoyancy of the floating dog is reduced to float the connecting unit by itself. Mooring. Then, when floating a plurality of connecting units, the above work is repeated as many times as necessary.

[0024]

As described above, the purification method according to the present invention purifies by the group of water-borne plants and microorganisms on the floating structure floating in the stationary accumulated water system. The excellent purification function of can be made to function at the optimum position for purification, and high purification efficiency can be realized. In addition, the burden of maintenance such as collection of dead bodies and management due to seasonal changes can be reduced, and more economical treatment can be performed. Furthermore, it does not require large-scale civil engineering work, and the impact on the natural environment can be minimized.

[Brief description of drawings]

1 is a cross-sectional view of a purification device according to the present invention.

FIG. 2 is a plan view seen from an arrow A ₂ direction in FIG.

FIG. 3 is a vertical cross-sectional view of the purification device according to the present invention.

FIG. 4 is a schematic view showing a usage state of the purification device according to the present invention.

[Explanation of symbols]

 1 Floating structure 2 Buoyancy generating part 3 Planting floor and waterway part 4 Aqueous plant community 5 Water supply means 6 Floating block (buoyancy member) 8 Soil layer

Claims (5)

[Claims] 1. A method for purifying a stationary stagnant water system such as a lake or a pond, in which a floating structure in which an aqueous plant is planted is floated at a desired position in the static stagnant water system. In addition, a method for purifying a static water system is characterized in that the water in the static water retention system is forced to circulate while contacting the plants on the floating structure. 2. The purification method according to claim 1, wherein a floating leaf plant is mainly used as the aqueous plant. 3. The purification method according to claim 1, wherein a plurality of floating structures are connected to each other to form a connection unit, and the connection unit is floated at a desired position. 4. A filter medium zone in which a suitable filter medium is filled in a part of the water passage of the floating structure or a part of the water passage of the floating structure of the connecting unit is provided. Purification method described in crab. 5. A purifying device used for purifying a stationary stagnant water system such as a lake or a pond, wherein a pair of left and right buoyancy generating parts to which a buoyancy member is assembled and an elongated groove structure are formed to form a soil layer at the bottom. On the soil layer of the planting floor and waterway part, by pumping out the water in the stationary stagnant water system with the planted floor and waterway part laid, the group of aquatic plants planted in the soil layer of the planting floor and waterway part A purifying apparatus comprising: a water supply unit for forcibly circulating water.