JPS607954B2 - 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.

Conventionally, various methods have been used to remove pollutants from water such as agricultural water from fields and leftover water from landfills. However, not only is it expensive to administer the drug, but there are also problems such as subsequent post-treatment of the precipitate.

Therefore, the present invention was made to solve the above-mentioned problems, and it is a simple and effective method that can remove pollutants from water and purify the water using aquatic plants. The purpose is to provide a high quality water purification method. The water to be purified is caused to overflow from a weir having a partition plate installed in the water channel of the water to be purified, and the water to be purified flows down from the upstream to the downstream of the water channel, and approximately 13 pairs of freshwater or saltwater aquatic plants are planted in the water channel. The culture is planted in a sand layer with a distance between the plants of 2 to 30 cm, and air is blown out from above the sand layer for aeration, and sand layer cleaning water is blown up from the bottom of the sand layer through the sand layer. . Embodiments to which the water purification method of the present invention is applied will be described below based on the drawings. In each of the different embodiments shown in each drawing, the same parts are indicated by the same part numbers.

First, in the water purification apparatus of Example 1 shown in the plan view of FIG. 1, a rectangular frame member 1 without a bottom is provided, and the water to be purified is transported from the upstream side of the frame member 1 as shown in the side sectional view of FIG. The water is sequentially made to flow downstream through a plurality of weir sections 3 having partition plates 2 that allow overflow, thereby removing some of the turbid substances in the water to be purified.

Next, the water to be purified flowing down from this weir part 3 as indicated by the arrow W is passed through a narrow channel 5 in which aquatic plants 4 are planted as shown in the cross section of FIG. It is taken out as purified water.

The distance between each plant of the aquatic plants 4 is approximately 15 cm to 30 cm.
It is desirable to plant the plants in an arc, and after forming the ground 6 at the bottom of the frame member 1, a layer of sand 7 is formed, and the aquatic plants 4 are planted within the layer of sand 7.

That is, in the water purification method of the present invention, the water to be purified is allowed to flow down through the weir section 3 having the partition plate 2, so that the turbidity mainly due to sediment is precipitated from the water to be purified by physical means. Then, aquatic plants 4 are allowed to flow into the flow channel 5 planted with water to give a rectifying effect to the flow, and to reduce dissolved substances such as nutrient salts such as nitrogen and phosphorus in the water and organic substances. can be removed by aquatic plants 4. In addition, in order to effectively use the area inside the narrow flow channel 5, as shown in the plan view of the second embodiment in FIG. It is also possible to overflow due to the head and bring it into contact with air to provide an aeration effect.

Furthermore, as shown in the partial side sectional view of the third embodiment in FIGS. 5 and 6, it is also possible to provide a weir section 3 in which each partition plate 2 is inclined to improve the aeration effect, and
A bottom member 8 may be provided at the bottom of the frame member 1.

In addition, in order to further improve the aeration effect,
As shown in the side sectional view of Example 4 in FIG.
An aeration pipe 10 suitable for the air pipe 9 is installed at the bottom of the flow channel 5 where the lotus is planted.
Aeration may be performed by air jetted from a nozzle.

In addition, in FIG. 7, a drain pipe 11 for cleaning the water purification device is provided at the lower part of the bottom member 8 of the frame member 1. Here, in the present invention, the aquatic plants 4 used for absorbing nutrient salts etc. in water include lily, futo, floating husk, grass, grass, etc., which can grow not only in fresh water but also in salt water. Although plants can be used, as shown in Embodiment 5 of FIG. It should be selected appropriately.

In addition, it is preferable to consider the following regarding the retention period of the water to be purified.

In particular, when removing organic substances, nutrient salts, etc. dissolved in water, the retention period (retention time) of the water to be purified should be at least 3 to 4 days, and in order to further increase the removal efficiency, 7 to 8 days. It would be desirable to create a method or facility for purified water to flow as described above.

Therefore, in the water purification method of the present invention, freshwater or saltwater aquatic plants such as Yoshi, Futoshi, etc. are cultivated in waterways, so that not only freshwater but also saltwater, such as polluted seawater from coastal landfills, can be purified. It is also possible to do so. Furthermore, since the water to be purified is made to overflow the partition plate and flow down from upstream to downstream, the water to be purified can be made into a mound by the overflow, and the decomposition of organic matter, etc. in the water to be purified can be promoted.

Furthermore, since a weir is provided in the water channel and the water to be purified is allowed to flow through the weir, it is possible to remove sand particles and suspended solids from the water to be purified. Furthermore, aquatic plants are cultivated on the sand layer,
Since the sand layer cleaning water is blown up from the bottom of the sand layer through the sand layer, it is possible to clean the planting bed of aquatic plants.

The sand layer facilitates such cleaning. Generally, when purifying sewage, the treatment of settling and accumulating sludge is a major problem. This sludge causes the coffin culture bed to become clogged, and the coffin culture bed loses the supply of oxygen in the water and enters a so-called reduction state, generating flowing hydrogen and the like, causing aquatic plants to wither. Therefore, in the present invention, the shield tower floor is made of a sand layer to facilitate cleaning, and washing water is blown up from the bottom of the sand layer to clean the shield culture bed and prevent aquatic plants from dying.

Specifically, tap water is poured into the upstream or downstream weir and the water is blown up from the cleaning drain pipe 11 onto the sand layer.

In addition, in the present invention, by shielding aquatic plants at a distance of approximately 15 to 25 degrees, the rectifying effect of water to be purified in a waterway by the aquatic plants is enhanced, and the purification effect is accordingly enhanced. Can be done.

[Brief explanation of the drawing]

The drawings show different embodiments of water purification devices using the water purification method of the present invention, and FIG. 1 shows embodiment 1 of the water purification apparatus.
A plan view of the water purification device in Figure 2 is A- in Figure 1.
3 is a side sectional view taken along the line B-B in FIG. 1, FIG. 4 is a plan view of the water purification device in Example 2, and FIG. 5 is a side sectional view taken in the direction A, FIG. 6 is a side sectional view of the main part of the weir part of FIG. 5, FIG. 7 is a side sectional view of the main part of the water purification device in Example 4,
FIG. 8 is a side sectional view of a main part of a water purification device in Example 5. 2...Partition plate, 3...Weir, 4...
Aquatic plants, 5...Flower channel, 7...Sand, 10
...Aeration piping. Figure 1 Figure 2 Figure 3 Figure 5 Figure 4 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. Water to be purified is caused to overflow from a weir having a partition plate provided in a waterway of water to be purified, and the water to be purified is made to flow downstream from the upstream side of the waterway, and freshwater or saltwater aquatic plants are planted in the waterway to a depth of approximately 15 cm. Using an aquatic plant, the aquatic plants are cultivated in a sand layer with a distance of 25 cm between plants, aerated by blowing air from above the sand layer, and blowing sand layer washing water up from the bottom of the sand layer through the sand layer. water purification method.