JPH03238094A - Circulating system for purifying water area - Google Patents

Abstract

PURPOSE:To obtain an effective way to purify the entire water areas of lakes and marshes which receive waste water from the peripheral regions but cannot flow the water out through rivers or waterway by a method wherein water is drawn up from the lakes and marshes and supplied through a catalytic oxidation waterway into a water area for aquatic plant cultivation and jets of oxygen are applied into the water. CONSTITUTION:The inlet of a water area A is formed in a water area B for aquatic plant cultivation having an aeration device E installed therein and the boundary between the water areas A and B is set by a water-passable defining structure C. The water is flowed from a location sufficiently distant from the cultivation water area B through a downflow type catalytic oxidation waterway into the cultivation water area B. The water is desalted by the absorption of nutritive salt by the aquatic plant and sent back into the water area A and a circulation of the water is thus produced between these water areas to gradually decrease the concentration of the nutritive salt in the entire water areas, whereby the water can be purified gradually. By applying jets of oxygen into the cultivation water area, moreover, the nutritive salt is supplied sufficiently for absorption by the surface layer of pleuston and its absorbing power can be maintained at a satisfactory level.

Description

[Detailed Description of the Invention] In recent years, the water quality of lakes and marshes has become increasingly eutrophic due to the large inflow of industrial and domestic wastewater, and the landscape has not only deteriorated due to the overgrowth of tall plants such as reeds, but also Especially in urban areas, it is causing serious social problems such as deterioration of water resources.

The present invention is one of the above-mentioned eutrophication countermeasures, and relates to a system for purifying water by utilizing the nutrient absorbing action of aquatic plants such as water hyacinth. On the other hand, it is an object of the present invention to provide a system that is effective in purifying entire bodies of water such as lakes and marshes that do not have rivers, waterways, etc. that drain.

The circulating water purification system according to the present invention, which has been devised to achieve the above-mentioned object, is a water-permeable water purification system in which two aquatic plants are cultivated in a part of a water area, such as a lake, through a water-permeable partition body that can prevent aquatic pickles from flowing out. □
Feature 4 is that a water supply facility is provided to the aquatic plant cultivation area, and the following effects can be obtained.

Aquatic plants are purified by the nutrient absorption action of substances, by circulating the stagnant water in the entire body of water such as lakes and marshes in a cyclical manner through pumps and other water supply equipment to the aquatic plant cultivation area. The purified water is circulated, and as the purified water circulates, the nutrient concentration of the entire water area gradually decreases, gradually purifying the water quality. Therefore, the present invention is particularly effective in purifying entire bodies of water where water tends to stagnate, such as closed lakes and marshes where sewage flows in from the surrounding area but has no rivers or channels to drain.

Embodiments of the present invention will be described in detail below based on the drawings.

In Figures 1 and 2, 3 (At is an example of a water area to be purified, such as a lake or marsh, and this water area (A+) is an aquatic plant cultivation area (Bl The water-permeable compartment body (C) is formed via a water-permeable compartment body (C).The water-permeable compartment body +C+ is supported by a weir with a net having a mesh that prevents aquatic plants from flowing out. Aeration device (E
) by ejecting air upward into the water via an aeration pipe, it dissolves oxygen in the air into the water, promotes vertical mixing of ice blocks, and removes nutrients from the bottom and lower layers of the water body to the surface layer (water surface). ), which has the function of preventing insufficient absorption of nutrients from the surface layer of floating aquatic plants such as water hyacinth.

(D) t/'i The aquatic plant is a submersible pump (d It is a water supply system consisting of a water pipe (d2) for transporting the aquatic plant cultivation area (BIK) along the edge of the water area (A), and the raw water sent through this water transmission equipment (D). is made to flow into the aquatic plant cultivation area (B) via a downstream contact oxidation waterway tF).

As shown in FIG. 3, the downstream catalytic oxidation waterway (F) is
Various forms of contact goods (E) k A flowing waterway that is arranged in a plane and uses head without using power, and this is a
This is to prevent a large amount of microorganisms from attaching to the roots of aquatic plants when the oD is high, thereby inhibiting the ability of the roots to absorb nitrogen and phosphorus.

Next, other examples will be listed.

[I] The water-permeable partition (C1) is configured as a water-impermeable partition at the intermediate position of the depth from the bottom of the aquatic plant cultivation area fBl, and is configured as a water-transporting partition beyond that point. The water level of the aquatic plant cultivation area (A) can be kept constant at all times, and water is constantly supplied by the pump, so it never runs out.

[11] The part of the water-permeable partition body tc+ described in #tJ, including the free liquid surface, is formed into a water-impermeable partition wall or a partition wall having a large number of very fine water-permeable holes, and 3
The portion located below this is configured as a water-permeable partition wall. In this case, the water/sail that floats only on the water surface of the aquatic cultivation area tBl (A), such as water hyacinth, has the advantage of being able to effectively prevent things from flowing into other water areas (Bl). .

[■ For example, when using aquatic plants that have the property of floating widely in water, such as chlorella, the water-permeable partition body (01) should be used to prevent the flow of aquatic plants and to allow all outflow of water. It is best to use a thin mesh net (synthetic resin bag net) that allows

In addition, as a modification of this embodiment, the water permeable partition body (
Only the portion of C1 located between the upper and lower water layers is composed of the above-mentioned net or a substance with the same function as this.

Crt'l It is also possible to install something that emits ultraviolet light, such as an ultraviolet lamp, near the aquatic plants in the aquatic plant cultivation area +Bj (A), thereby making the aquatic plants more active.

[V] When there is a channel into which sewage flows into a water area, the structure is used so that the sewage in this channel (A) flows into the aquatic plant cultivation area (B).

[Brief explanation of drawings]

The drawing shows Example 4 of the circulating water purification system according to the present invention.
1 is a schematic plan view of the water area to be purified, FIG. 2 is a schematic vertical cross-sectional view, and FIG. 8 is a conceptual diagram of a downstream type catalytic oxidation waterway. (N...Aquatic areas such as lakes, (B)...Aquatic plant cultivation areas, (C)...Water-permeable compartments, +
DI...Raw water transmission equipment.

Claims (1)

[Claims] Aquatic plant cultivation areas (B) in some areas of water areas such as lakes (A)
are partitioned through a water-permeable partition body (C) that can prevent outflow of aquatic plants, and at the same time, pumping up raw water from a location sufficiently distant from the aquatic plant cultivation area (B) in the water area (A). A circulating water area purification system that is equipped with equipment (D) for conveying this water to the aquatic plant cultivation area (B).