JPH07185580A - Purifying device for river - Google Patents

Abstract

PURPOSE:To execute construction with simple work and to inexpensively purify a river by installing a pebble unit whose confronting side walls are formed in at least net shape and in the container of which a stone is housed extending over the full width of the river. CONSTITUTION:The pebble unit 2 is constituted in such a way that a bar shape body 21 made of fiberglass reinforced plastic foaming body is assembled in a box shape container, and a net 11 is stretched on the side plane, and the stone 23 such as the granite porphyry with barley of comparatively rough and large in diameter is housed. When the contruction to purify the river is performed, protective piles 3 are driven in a width direction in three lines first. Thence, the pebble unit 2 is installed at the upstream side of the river of the protective pile 3 by lifting by a wrecker truck, etc. Such installation is performed by installing first protective piles 3 in two lines/three stages, and the next piles 3 in two lines/two stages, and last piles 3 in two lines/one stage, respectively. In this way, an aerobic bacteria can be bred by entrapping the air by the flow of the river, and the digestion of an organic matter can be performed. and also, sludge, etc., can be eliminated by attaching on the stone 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a river purification device.

[0002]

2. Description of the Related Art Recently, river water has become a social problem because it is polluted by domestic wastewater. Various methods have been tried to purify this river dirt. For example, chemicals are put in to purify, or compressed air is introduced into the river to breed aerobic bacteria in the river to digest organic matter in the river. Further, JP-A-2-122894 discloses a liquid purification method using foamed plastic particles.

[0003]

However, the method of introducing chemicals is expensive and the chemicals contaminate river water, so they are rarely used. Further, the method of introducing compressed air into a river has a problem in that it requires facility costs and operation costs, maintenance is difficult, and the cost is high. Further, the liquid purification method using expanded plastic particles described in the above publication is used when there is severe dirt such as sewage, and when it is not much polluted as compared with sewage such as in rivers. There is no purification effect when used. Therefore, an object of the present invention is to propose a river purification device that can be installed by simple construction and can purify a river at low cost.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, in which a gravel unit in which stones are placed in a container in which at least opposite side walls are reticulated is a container. The net-like side wall is provided almost in the width of the river with the direction of the river flowing.

The gravel unit used in the present invention is a container containing stones. At this time, any stone may be used as long as it does not contain a substance eluted in the river. For example, chestnut stone, crushed stone, pumice stone, barley stone, etc. are suitable. Especially, barley stone is preferable. The container used for the gravel unit may be any container as long as the opposite side walls are mesh-shaped. For example, it may be a bag-shaped net, or an octahedron made by assembling 12 rod-shaped bodies in a box shape,
All of the respective faces may be nets, or only the opposite faces may be nets. The rod-shaped body used here may be bamboo or wood, but is preferably made of a plastic that does not easily corrode when placed in water. Particularly, a plastic reinforced with glass fiber or a plastic foam is preferable because it is light and has high strength.

Further, although the gravel unit is provided almost in the width of the river, one gravel unit may be filled in the width, but normally, when a plurality of gravel units are arranged side by side, It is preferable because it can be applied to various widths of a river.
Further, although they may be provided in one row, it is preferable to provide them in a large number of rows because the purification capacity becomes large. Further, this gravel unit may be provided in only one stage, or may be stacked in multiple stages to be provided in multiple stages.

[0007]

In the river purifying apparatus of the present invention, the gravel unit is provided so as to fill the width of the river with the mesh side wall of the container directed in the flowing direction of the river. Go in, rush through the stones, and out from the opposing mesh-like surface. In this way, as air bubbles are entrained when flowing through these stones vigorously, air is absorbed in the river, aerobic bacteria propagate, and organic matter is digested. Also, sludge and the like adhere to the stones and are removed while passing between the stones.

Further, when it rains and the amount of water increases and it goes over the gravel unit, it falls into a waterfall state when it goes over the gravel unit. At this time, a large amount of air is involved and aerobic bacteria propagate. Digest organic matter. In this way, if the gravel unit is used for a long period of time and the gravel unit becomes dirty and the ability to digest organic substances deteriorates, the gravel unit can be lifted and replaced by a crane or the like. In the present invention, since many stones are put in the container, even relatively small stones can be attached without being swept into the river. Since the river purification device of the present invention is provided with the gravel unit only in the river, the facility cost is low, the construction is easy, and the maintenance is easy. Also, replacement is easy.

[0009]

EXAMPLES Next, examples of the present invention will be described. 1 to 3 show an embodiment of the present invention, FIG. 1 is a side view showing a river purification device, FIG. 2 is a plan view of the river purification device of FIG. 1, and FIG. 3 is a perspective view of a gravel unit. It is a figure.

1 to 3, reference numeral 1 denotes river water. Reference numeral 2 is a gravel unit, and 12 rod-shaped bodies 21 made of glass fiber reinforced plastic foam are assembled into a box-shaped container as shown in FIG. The stone 23 made of barley stone (having a main component of calcium silicate) having a large grain size is put therein. A hook hole 25 is provided on the upper surface of the rod-shaped body 21 so that it can be easily lifted by a wrecker. Reference numeral 3 is a protective pile provided so that the gravel unit 2 does not flow.

Next, the construction method and usage method of this river purification apparatus will be described. Protective piles 3 will be installed in three rows in the width direction of the river. Next, the gravel unit 2 is lifted with a tow and installed on the river side of the protective pile 3. This installation method installs in two rows and three stages on the upstream side of the first protective pile 3 and in two rows and two stages on the upstream side of the next protective pile 3.
Two rows and one step will be installed on the river side of the last protective pile 3.

Then, as shown in FIG. 1, the river flows across the side surface of the gravel unit 2. At that time, since air is involved, the air is absorbed in the river and aerobic bacteria propagate,
Organic matter is digested. Further, sludge and the like adhere to the stones 23 while passing between the stones 23 and are removed. When it rains and the amount of water increases and it crosses over the gravel unit 2, it forms a waterfall when crossing the gravel unit 2. At this time, a lot of air is involved and aerobic bacteria propagate a lot. And digest organic matter. Although the stones 23 easily flow, the stones 23 do not flow because they are contained in the container.

When the gravel unit 2 is used as described above and the ability to digest organic matter is deteriorated, the gravel unit 2 becomes dirty.
Lift with a crane to replace it. Since the river purification device of the present invention only installs the gravel unit 2,
It is inexpensive and easy to maintain. Further, it can be easily installed in a place where a large-scale device cannot be attached, such as a river flowing through the town.

[0014]

As can be seen from the above description, the river purifying apparatus of the present invention is inexpensive because it only installs the gravel unit, is easy to maintain, and is easy to replace. Moreover, it is convenient because it can be easily installed in a place where a large-scale device cannot be installed, such as a river flowing through the town.

[Brief description of drawings]

1 shows an embodiment of the present invention and is a side view showing a river purification device.

2 is a plan view of the river purification apparatus of FIG. 1. FIG.

FIG. 3 is a perspective view of a gravel unit.

[Explanation of symbols]

 1 River water 2 Gravel unit 21 Rod-like body 22 Net 23 Stone 3 Protective pile

Claims (1)

[Claims] 1. A gravel unit in which stones are placed in a container in which at least opposing side walls are reticulated is provided substantially in the width of the river with the reticulated side wall of the container oriented in the flowing direction of the river. A river purification device characterized by being