JPH0455536A - Stormwater treatment device - Google Patents

Abstract

PURPOSE:To facilitate water catchment in a large area by connecting a plurality of drainage manholes comprising a catchment section, permeable cylinder and adsorbent layer to a drain pipe through the permeable cylinder and connecting the drain pipe to a regulating reservoir. CONSTITUTION:A drainage manhole M comprises a catchment section 5, permeable cylinder 4, adsorbent layer 8 and sand 9. Underground water collected through drain pipes 15 is treated in the manhole and the surface moisture 22 purified in each manhole M is discharged through drain pipes 3 to a regulating reservoir 11. A regulating reservoir 11 on a high level is connected to a regulating reservoir 11 on a low level through an overflow mechanism 12 so that the water purified at a stormwater treatment device on a high level is led successively to the regulating reservoir 11 on a low level and then to a final regulating reservoir 13 and discharged to the downstream. As a result, surface moisture in a large area can be treated efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rainwater treatment device, and more particularly to a rainwater treatment device suitable for installation at a golf course or the like to collect soil surface water containing agricultural chemicals, etc. .

(Prior art) Conventionally, as this type of rainwater treatment device, one is known in which hollow concrete manholes are buried, for example, every 40 meters, and the bottoms of the manholes are connected to drainage pipes to treat rainwater. .

(Problem to be solved by the invention) However, with such a rainwater treatment device, there is a risk that a large amount of pesticides may be contained in the wastewater discharged at the beginning of a rainfall. It was necessary to provide ancillary facilities for this purpose.

(Means for Solving the Problems) The present invention solves the drawbacks of such conventional rainwater treatment devices.
The purpose of this invention is to provide a rainwater treatment device suitable for use in golf courses in particular.The invention has a structure in which water cannot be collected from the sides at the top end of the manhole body, but water can be collected only from the top surface. A water-permeable cylindrical body having a water collection part connected to the drainage system at its lower end is arranged, and a plurality of water collection manholes each having an adsorbent layer arranged around the cylindrical body are installed in the water-permeable cylindrical body. It is characterized in that it communicates with the drain pipe via the drain pipe, and the drain pipe communicates with the regulating pond.

The adsorbent layer of each water collection manhole may be configured as a double layer consisting of a lower layer of activated carbon adsorbent layer and an upper layer of clay adsorbent layer. A water collection pipe may be connected above the water pipe.

(Effect) At the beginning of rainfall, the precipitation with the highest concentration of pesticides is absorbed into the soil and naturally decomposed by soil microorganisms, and the initial surface water that is not absorbed into the soil, that is, the precipitation with relatively high concentrations of pesticides, is absorbed into each catchment area. Water that flows into the manhole body of the manhole, where pesticides are adsorbed and purified by the adsorbent layer, is led to a drainage pipe through a permeable cylindrical body, and further discharged to a regulating pond via the drainage pipe, and then Precipitation with a diluted pesticide concentration passes through the surface of the adsorbent layer, flows directly from the water collection part into the permeable cylindrical body, is led to a drain pipe with a low pesticide concentration, and then flows through the drain pipe to a regulating pond. It is discharged.

When the adsorbent layer of each water collection manhole is configured as a double layer consisting of a lower activated carbon adsorbent layer and an upper clay adsorbent layer, some of the pesticides adsorbed by the lower activated carbon adsorbent layer are The fertilizer that is decomposed by microorganisms in the soil and adsorbed to the upper clay adsorbent layer is consumed by grass etc. planted in the soil. In addition, if the water collection pipe is passed above the adsorbent layer of each water collection manhole, excess fertilizer and pesticides contained in groundwater in the soil can be adsorbed by the adsorbent layer, and the soil condition can be maintained in good condition. .

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

The first diagram shows an example in which the rainwater treatment apparatus of the present invention is installed at a golf course.This embodiment shows an example in which three rainwater treatment apparatuses are installed in accordance with the height differences of the golf course.

1 in the figure shows a water collection manhole, and as shown in detail in FIG. A water-permeable cylindrical body 4 made of water-permeable concrete is erected above the through-hole 2 in communication with the through-hole 2, and a water-permeable cylindrical body 4 made of water-permeable concrete is installed at the upper end of the cylindrical body 4 to prevent water from collecting from the side. A water collection part 5 is attached to the structure so that water can be collected only from the top surface. In the illustrated embodiment, the water collection section 5 is made of a concrete cylinder 5a.
A drainboard 5C is disposed in the upper opening 5b. Inside the manhole body 1, an adsorbent layer 8 is arranged, which consists of a lower activated carbon adsorbent layer 6 made of granular activated carbon, powdered activated carbon, etc., and an upper clay adsorbent layer 7 made of zeolite, etc. It is set up. Further, the upper surface of the adsorbent layer 8 is filled with sand 9 in order to protect the adsorbent layer 8.

Each of the water collection manholes M thus constructed is communicated with a drain pipe 3 through a through hole 2 in each rainwater treatment device, and each drain pipe 3 is communicated with a regulating pond 11.

In the illustrated example, a higher level regulating reservoir 11 and a lower regulating reservoir 11 are connected via an overflow mechanism 12 such as a pump, and the regulating reservoir 11 of the lowest level rainwater treatment device is connected via an overflow mechanism 12. It is connected to a final regulating reservoir 13, and the wastewater in the final regulating reservoir 13 is normally discharged to a water collecting manhole M having the same structure as described above through a porous filtering outlet 14 provided at the bottom 13a. The water is further discharged downstream and the overflow mechanism 12 is activated during abnormal rainfall.
This is done so that it is discharged downstream in a diluted state through the water.

In addition, in this embodiment, a concrete water collection pipe 1 is provided with a large number of 15 m through holes on the adsorbent layer 8 of each water collection manhole M.
5 is connected to collect soil and groundwater.

In the figure, 20 indicates soil, 21 indicates grass, and 22 indicates surface water.

According to such a rainwater treatment device, at the beginning of rainfall, that is, precipitation with the highest concentration of pesticides is absorbed into the soil 20 and naturally decomposed by soil microorganisms, etc., and the initial surface water that is not absorbed into the soil 20, that is, the precipitation with the highest concentration of pesticides, is reduced. The concentrated precipitation flows into the manhole body 1 of each water collection manhole M, and the water that has been purified by adsorbing pesticides by the adsorbent layer 8 is discharged to the drain pipe 3 through the permeable cylindrical body 4, and then The precipitation with a diluted pesticide concentration passes through the surface of the adsorbent layer 8 and reaches the water collection section 5.
The agricultural chemicals flow directly into the water-permeable cylindrical body 4 and are discharged into the drain pipe 3 with a low concentration of pesticides.

Further, the fertilizer adsorbed by the upper clay-based adsorbent layer 7 is consumed by the lawn 21 planted in the soil 20, and some of the pesticides adsorbed by the lower activated carbon-based adsorbent layer 6 are absorbed by microorganisms in the soil 20. It is decomposed by

In addition, each water collection manhole M also collects and processes soil groundwater collected via the water collection pipe 15.

The surface water 22 purified by each water collection manhole M is discharged to a drain pipe 3 and further discharged to a regulating pond 11.

In the illustrated embodiment, the upper regulating reservoir 11 and the lower regulating reservoir 11
is communicated with through an overflow mechanism 12, and the wastewater that has been purified by the higher-level rainwater treatment device is sequentially guided to the adjustment pond 11 of the lower-level rainwater treatment device, and further to the final adjustment pond 13 for final adjustment. In the pond 13, the bottom 13a is always
The water is discharged into the water collection manhole M through a porous filtration outlet 14 provided in the water tank, and is discharged further downstream.In the event of abnormal rainfall, etc., the water is discharged downstream in a low concentration state via an overflow mechanism 12. Release water.

(Effects) As described above, according to the rainwater treatment device of the present invention, each water collection manhole collects water according to the pesticide concentration, so even during heavy rainfall, the pesticide concentration on the soil surface is reduced. Water can be efficiently collected without leaving concentrated surface water, and each water collection manhole is connected to a drainage pipe, which in turn is connected to a regulating pond, allowing efficient purification of soil surface water over a wide area. Furthermore, by arranging multiple rainwater treatment devices according to height differences, soil surface water over a wide area with height differences can be efficiently purified by simply communicating each regulation pond through an overflow mechanism. It has the effect of being able to treat wastewater and wastewater.

In addition, if the adsorbent layer of each water collection manhole is configured as a double layer consisting of a lower activated carbon adsorbent layer and an upper clay adsorbent layer, the fertilizer adsorbed by the clay adsorbent layer will be absorbed into the soil. Pesticides that are consumed by plants such as grass and adsorbed to the activated carbon adsorbent layer are decomposed by soil microorganisms, and the adsorbent layer has a long lifespan and does not need to be replaced frequently. play.

Furthermore, if a water collection pipe is connected above the adsorbent layer of each water collection manhole, surplus fertilizers and pesticides contained in groundwater in the soil can be adsorbed by the adsorbent layer, and the soil condition can be maintained in good condition. It has the effect of

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of an installed state of an embodiment of the rainwater treatment device of the present invention, and FIG. 2 is a vertical sectional view of a water collection manhole used in the rainwater treatment device. M... Water collection manhole 1... Manhole body 3
...Drain pipe 4...Water permeable cylindrical body 5...
・Water collection part 6...Activated carbon adsorbent layer 7...
・Clay-based adsorbent layer 8...Adsorbent layer 9...Sand
11... Regulating reservoir 12... Overflow mechanism 13... Final regulating reservoir 14... Filtration outlet
15... Water collection pipe 20... Soil 2
1... Grass 22... Surface water

Claims (1)

[Scope of Claims] 1. A water-permeable cylinder in the center of the manhole body, which has a water collection part at the upper end that makes it impossible to collect water from the sides and can collect water only from the top surface, and whose lower end is connected to a drain pipe. At the same time, a plurality of water collection manholes each having an adsorbent layer arranged around the cylindrical body are connected to the drainage pipe through the permeable cylindrical body, and the drainage pipe is connected to a regulating pond. A rainwater treatment device characterized by being connected to each other. 2. The rainwater treatment device according to claim 1, wherein the adsorbent layer of each water collection manhole is constructed as a double layer consisting of a lower activated carbon adsorbent layer and an upper clay adsorbent layer. 3. The rainwater treatment device according to claim 1 or 2, characterized in that a water collection pipe is communicated above the adsorbent layer of each water collection manhole.