JPS607955B2 - Water purification method using aquatic plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water purification method using aquatic plants, which is mainly used for purifying water such as contaminated pond water.

In relatively large ponds, various types of wastewater such as domestic gray water, sewage, and agricultural water from the surrounding area flow into the pond water, and suspended solids, organic substances, nitrogen, and phosphorus contained in the wastewater flow into the pond water. The water quality deteriorates due to nutrient salts such as
There is a problem in that it becomes impossible for fish to live in the pond, and the environment within the pond deteriorates.

Therefore, the present invention was made to solve the above problems, and aims to remove pollutants from pond water using aquatic plants, purify the water quality, and improve the environment within the pond. This is the purpose.

That is, in the water purification method of the present invention, the bottom mud in the pond is solidified, a sand layer with a thickness of 30 to 100 degrees is formed on the solidified bottom mud, and the distance between the plants is approximately 15 to 30 degrees. This method is characterized by the fact that it not only protects aquatic plants, but also performs aeration by blowing air out from above the sand layer.

An embodiment to which the water purification method of the present invention is applied will be described below with reference to the drawings.

First, after pumping out the water in the pond 1 shown in the plan view in Figure 1 and the side sectional view in Figure 2, the bottom mud in the area indicated by 2 is solidified.In the case of a large pond, cement is It can also be mixed with bottom mud 2 and solidified.

Next, a layer of sand 3 with a thickness of 30 to 50 degrees is formed on the top surface of the solidified bottom mud 2, and furthermore, approximately 1 layer of sand 3 is formed in the pond 1.
Aquatic plants 4 are planted at a distance of 30 skins from 5 to 5.

Further, on the layer of sand 3, an aeration pipe 10 suitable for the air pipe 9 on land is laid, and the pond water is heated by air ejected from the nozzle 8 of the aeration pipe 10. In addition, 5A in Figure 1 is the pond water inflow part,
5B is a pond water pressure outlet. The above-mentioned aquatic plants 4 are particularly effective in absorbing nutrients, etc., and further aeration promotes the mound effect of pond water and convection of pond water.
The aquatic plants 4 themselves act to physically promote sedimentation of pollutants in the pond water, and also remove dissolved substances and organic substances in the water.

Aquatic plants 4 used here include Yoshi, Futoi,
Plants that grow naturally in Japan, such as seaweed, grass, grass, etc., can be used, but as shown in Figure 2, in the deep water areas, floating plants such as seaweed, seaweed, etc. can be planted. The type may be selected as appropriate depending on the situation without being particularly particular about the above types.

In addition, if the distance between plants 4 is too large, the purification effect will be small, and if it is too small, it will be difficult to plant.
This is inappropriate because convection within the pond water becomes difficult to occur, and experimental results have confirmed that a distance between plants of approximately 15 to 30 skins is optimal.

Therefore, if the water purification method of the present invention is applied to the purification of contaminated pond water, etc., the bottom mud of the pond will be solidified and a sand layer will be formed on the solidified bottom mud, thereby preventing the contamination of the aquatic plant cover culture bed. This can promote the growth of aquatic plants, thereby further improving water quality purification.

In other words, in polluted ponds, the water becomes eutrophic and a large amount of plankton etc. are generated, and due to the lack of oxygen in the water, dead fish and plankton bodies settle and accumulate, causing the mud quality of the bottom mud to deteriorate. Turns into sludge and sludge.

In such contaminated bottom mud, undecomposed sediments are also deposited, and the mud is in a reducing state due to lack of oxygen, causing hydrogen sulfide and methane gas that can kill aquatic plants and fish. They usually produce toxic gases that can kill shellfish.

It is also known that the more the polluted bottom sludge becomes reduced, the more nutrients such as phosphorus elute into the water, further deteriorating the water quality.

Therefore, when using aquatic plants to purify water,
At the same time, it is necessary to purify the oak tower bed of aquatic plants.

The present invention achieves the lowest cost by solidifying the bottom mud.
In addition, contaminated bottom sludge can be easily removed, the generation of harmful gases such as hydrogen sulfide and methane gas can be prevented, and the growth of aquatic plants and the purification of sewage by these aquatic plants can be promoted.

In addition, since the bottom mud is solidified, it is possible to prevent the elution of nutrients from the bottom mud, which is one of the causes of water pollution.
Water purification can be further promoted. Furthermore, in the present invention, since the bottom mud is solidified, the sand layer for aquatic plants also has a thickness of 30%.
The thickness only needs to be ~100cm, which reduces construction costs and stabilizes the ground. Therefore, according to the present invention, a growing environment is provided for aquatic plants, fish and shellfish, and water quality purification is further facilitated.

Furthermore, since the distance between the plants of the aquatic plants has been changed from approximately 15 to 30 arcs, it is possible to cultivate sufficient aquatic plants and create a factory with a purifying effect.

Furthermore, since aeration is performed, pollutants in the pond water that are difficult for aquatic plants to use due to the gliding of the pond water can be decomposed, making it easier for aquatic plants to use the water.

This will also create a new pond, which will be effective in improving the environment within the pond.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of a pond to which the water purification method of the present invention is applied, and FIG. 2 is an enlarged side sectional view of the main part of FIG. 1... Pond, 2... Solidified bottom mud, 3...
...Sand, 4...Aquatic plants, 10...
Aeration piping. Figure 1 Figure 2

Claims (1)

[Claims] 1 Solidify the bottom mud in the pond, form a sand layer with a thickness of 30 to 100 cm on the solidified bottom mud, and add approximately 15 cm to the sand layer.
A water purification method using aquatic plants, which comprises planting aquatic plants at a distance between plants of 30 cm to 30 cm, and performing aeration by blowing air out from above the sand layer.