JPH03257210A - Preventing device for environmental pollution caused by lawn agricaltural chemical - Google Patents

Abstract

PURPOSE:To certainly remove an agricaltural chemical from lawn drainage by constructing a fence formed of piled up pouch bags made of a net bag, in which the mixture of charcoal trash and sand is enclosed, in a catchment pond provided on a catchment path, and bringing the fence into contact with a pond water. CONSTITUTION:Catchment ponds 2a, 2b are provided on the any of a surface water catchment path 1 formed depending on the geographical features of a lawn, and the downstream sides of the ponds 2a, 2b are connected through a water conduit 5 to a river 6 or the like. A granule compound composed of 10-20% in weight of charcoal trash, coal powder, or those mixture, and sand is enclosed in a net bag to form a pouch bag. A fence 4a formed of the piled up pouch bags is constructed in the catchment ponds 2a, 2b, and at least partially brought into contact with the water in the ponds 2a, 2b.

Description

[Detailed Description of the Invention] (Purpose of the Invention) The creation and maintenance of turf is an essential means for covering the ground in the construction of golf courses, baseball fields, other sports fields, parks, etc. Turfgrass, which is a useful vegetation, is vulnerable to diseases caused by microorganisms such as leaf blight, damping-off, cotton rot, and snow rot, as well as to feeding damage by insects such as scarab beetle larvae, white fleas, aphids, and bollworms. Regular applications of inorganic and organic insecticides are used to maintain vegetation, and herbicides are also used to control broadleaf weeds from lawns.

These pesticides have minimal toxicity to humans and livestock unless ingested orally. However, pesticides sprayed on lawns are released from vegetation by precipitation and flow into public water bodies such as rivers and lakes along with surface water drainage, and if the concentration in water is high, it can kill animals living in water bodies such as fish. Contamination of drinking water due to water intake from rivers is also frequently reported. Particularly in recent years, a large number of golf courses have been opened and operated in various places, and there are often cases of actual damage caused by pesticides contained in the wastewater of the vast lawns. However, other than restricting the use of pesticides and regulating the construction of new golf courses, no proposals have been made or implemented. #It goes without saying that it would be ideal to completely abolish the use of pesticides to prevent chemical pollution, but as long as the purpose is to maintain lawns, complete abolition is currently impossible.

Thus, while the construction of golf courses and other grass fields is beneficial for improving national health in terms of its use, it is also harmful because the construction itself is a source of pollution.

Now, as a typical example of pesticide pollution caused by the construction of lawns, if we look at golf courses with large lawns, we can see the following: Hokkaido Golf Report No. 64, a weekly magazine published by Hokkaido Golf Report (published January 31, 1990). ) contains the following report article. In other words, the Hokkaido Ministry of Health and Environment
During the period from January to December, wastewater from 56 golf courses in Hokkaido was sampled and the pesticide content was investigated.

The five pesticides to be analyzed are MCPP (herbicide), Dipterex (insecticide), Thiuram, Daconyl, and organic copper (each fungicide). Dipterex and Daconil were not detected in the water samples, but some of the other pesticides were detected in 15 samples. Regarding the concentration of pesticides in water, the half-lethal concentration for carp is 4°7■/I for MCPP! When the standard concentration is 0.18 ■/l for organic copper and 4.0 ■/1 for thiuram, the concentration of the detected pesticide in water is 1 of the standard concentration for MCPP (1 sample). /4700, 1/3 to 1/225 for organic copper, and 1 for thiuram.
It is reported that it was 1/8 to 1/800.

In other words, according to the survey related to the above report, the concentrations of the pesticides surveyed in wastewater were all said to be below the standard concentration, but since the standard concentration itself is the half-lethal concentration for fish, It must be said that large numbers such as I/3 to 1/8 are a serious problem in terms of preserving the living environment. Furthermore, since the above survey was conducted on only a few types of pesticides currently being used at existing golf courses in Hokkaido, it does not apply to golf courses all over the country and other pesticides. It is clear that this report cannot guarantee the safety of spraying pesticides on lawns.

As mentioned above, pesticides released from vegetation due to precipitation are present in dissolved or suspended state in lawn drainage, but when examining the concentration of pesticides in drainage, it is found that The concentration is greater when the amount is small than when it is large.

This is thought to be due to the influence of the spreading agent contained in the sprayed solution. In other words, pesticides spread and fixed on vegetation are not liberated by a small amount of precipitation, but when the amount of precipitation increases to a certain extent, they are liberated from the vegetation and are washed away with surface water. However, since pesticides are fixed by a spreading agent, the amount of pesticides released does not immediately increase in proportion to the amount of precipitation just because the amount of precipitation is high. On the other hand, since the amount of drainage from a lawn is proportional to the amount of precipitation, the concentration of pesticides in the wastewater is high when the amount of precipitation is low, and decreases when the amount of precipitation is large.

In other words, this invention has the above-mentioned social and theoretical background, but in order to eliminate the above-mentioned antinomy relationship caused by the construction of the lawn, this invention This was developed with the aim of providing an economical means to reliably and efficiently remove agricultural chemicals.

(Structure of the Invention) The present invention will be described below with reference to the drawings depicting one embodiment of the present invention. The drawing shows an example in which the present invention is applied to a golf course, where various parts of the undulations of the lawn form a collection channel 1 for surface water due to the topography of the lawn. A water collection pond 2a is provided downstream of the water collection channel 1, and a discharge port 9 of the water collection pond 2a is connected to a nearby river 6 via a water conduit 5. Such a water collection pond 2a in the present invention is called a "regulating pond" at a golf course, and the water flowing from the water collection channel 1 flows into the regulating pond from the inlet 8.

4a and 4b are barriers made by stacking cyst bags 3, and barrier 4a is made by stacking cyst bags 3 vertically, and protecting the front and rear surfaces by sandwiching them between cracked stones 7, as shown in Figure 4. , it is a weir-shaped structure. Barrier 4b is water collection pond 2a
The bag 3 is laid down along the inner sloped wall using its own weight. Both the barriers 4a and 4b allow water to flow into the bladder bag 3.

The front bag 3 is a granular powder composition consisting of 10 to 20% by weight of charcoal scraps, coal powder, or a mixture of charcoal scraps and coal powder, and the remainder sand, sealed in a mesh bag.

In the examples, a few examples of the composition of the grain powder composition enclosed in the front cover 3 are as follows: (1) Charcoal waste 10% by weight Sand 90/' (2) Coal powder 20M% Sand 80' / (3) Charcoal scraps 5% by weight Coal powder 10/' Sand 85/l The charcoal scraps are not limited to any tree species and may be so-called "kuzusumi". Coal powder can also be produced in any region. Of course, it is better to use less raw coal if the degree of carbonization is advanced, but even powdered waste that remains in large quantities in high-grade coal mines such as the Yubari and Sorachi coal mines can also be used. I know I can do it. These powders are currently available at low cost and in large quantities.

The sand in the powder composition described above may be any type such as sand, sea sand, or mountain sand.5 The bag material for the front cover 3 may be made of other natural fibers for jute bags, polypropylene, etc.6.
Any material can be used, such as m-fibre or plastic molded mesh, which is extremely inexpensive and produced in large quantities for packaging fruit and other items. Is the size of front cover 3 appropriate?
As mentioned above, the bulk of the weight of the front load 3 is made up of sand with a high specific gravity, and it is not necessary to transport it to the site or use the above-mentioned 1IE94a, 4
It is better to choose a size that is easy to carry, considering that the structure of b may require manpower to transport.

According to the embodiment shown in FIG. 1, a barrier 4a is provided across the steeply sloped part of the water collection channel 1 on the upstream side of the water collection pond 2a. It has the same cross-sectional structure as the barrier 4a, but it is constructed like a dam on the discharge side of a general water storage dam for power generation and other purposes, and when there is a lot of precipitation, a water collection pond 2b is formed on the upstream side of the barrier 4a. ing. Water collection pond 21〕ζ
Since the barrier 4a constitutes a part of the wall of the water collection basin 2b, this temporarily retained water passes through the barrier 4a (and flows downstream).

That is, according to the present invention, first, water collection m2a and 2b are provided in the surface water collection channel 1 due to the topography of the lawn, and the downstream side thereof is connected to a river or the like.

Next, according to the present invention, the barriers 4a and 4b are formed by stacking the vestibules 3 containing the powder composition contained in the mesh bags ζ.
is constructed in the water collection ponds 2a and 2b (7) It is necessary that at least a part of this barrier comes into hydraulic contact with the pond.
It consists of coal powder or a mixture of 4i charcoal waste and coal powder.

This invention is made as described above, and water collection ponds 2a and 2b are provided in the lawn 0) surface water collection channel 1 due to the topography, and the water collection ponds 2
Since the downstream side of a and 2b is connected to a river, etc., some of the surface water caused by rainfall on the lawn and melting of snow on the lawn (3'z + i) is absorbed by the topsoil of the lawn. However, the other part passes through the water collection channel 1, enters the water collection ponds 2a and 2h, temporarily stagnates therein, and then is released into public waters.

Regardless of precipitation, some of the pesticides applied to the lawn will remain on the vegetation, or some of them will penetrate into the topsoil of the lawn with the precipitation [7, and gradually decompose. (2, it loses its toxicity. However, another part of the pesticide is accompanied by surface water and flows through the water collection channel 1 into the water collection ponds 2a and 2b.
Remains temporarily in the pond.

According to this invention, the water collection basins 2a, 2b are provided with barriers 4a, 4 formed by stacking front covers 3 in which a powder composition is sealed in a mesh bag.
b is constructed so that the water in the pond comes into contact with at least a portion of this barrier, so the agricultural chemicals that flow into the pond come into contact with the above-mentioned powder composition along with the stagnant water. At this time, when the hourly flow rate flowing into the water collection ponds 2a, 2b is low, the water level of the ponds is low, and therefore only the bases of the barriers 4a, 4b are submerged. However, since these barriers are stacked with the front cover 3 in which the powder composition described above is sealed in a net bag, the water that comes into contact with the submerged base will be absorbed by the surface of the water due to surface tension. Even when the water level in the pond is high due to heavy rain, or conversely when the water level is low due to little rainfall, the entire barriers 4a and 4b come into contact with the pond water.

Now, according to the present invention, the above-mentioned powder composition contains carbon-based components such as charcoal chips and coal powder in addition to sand in an amount of 10 to 20%.
Since it contains % by weight, the barrier 4a.

The catchment water that has come into contact with 4b comes into contact with these carbon-based compositions.

It is well known that activated carbon has an internal surface area of 1,000 to 1,500 m per gram and has an extremely excellent adsorption ability for various gases and organic and inorganic drugs. Although it is inferior, it has an internal surface area of about 10% that of activated carbon, so it acts satisfactorily as an adsorbent for diluted agricultural chemicals. The same applies to coal powder.

As mentioned above, drainage from lawns with catchment ponds is rather problematic because the concentration of pesticides is higher when the water level of the catchment ponds is low, but according to the present invention, as mentioned above,
Regardless of the water level, the pond water comes into contact with the entire particulate composition contained in the barriers 4a and 4b,
At that time, as a result of the pesticides in the water being adsorbed by the carbon-based composition in the powder composition, the concentration of pesticides in the wastewater discharged from the water collection ponds 2a and 2b is significantly reduced, and the wastewater becomes substantially harmless. They are then released into public water bodies such as rivers, lakes and marshes.

Further, according to the present invention, the above-mentioned barrier 4a.

4b is constructed in water collection ponds 2a and 2b, the flow rate of water in the ponds is extremely slow, and therefore, the contact time of water with the carbon-based composition is long, so that the adsorption of agricultural chemicals by the carbon-based composition is difficult. The removal effect is large and reliable.

Furthermore, according to the present invention, since the nobles 3 constituting the barriers 4a and 4b contain a large amount of sand with a high specific gravity,
The barriers 4a and 4b are extremely stable underwater and will not be easily destroyed even if the water collection pond is submerged in a torrent due to heavy rain.

Furthermore, since the barriers 4a and 4b are formed by stacking the layers 3, the layers 3 can be easily replaced when the carbon-based composition described above becomes saturated and the adsorption force decreases, or periodically.

According to the present invention, it is necessary to provide a water collection pond in the water collection channel of the lawn, but in addition to being able to use the regulating ponds installed in most golf courses as they are, barriers 4a, 4
b is extremely easy and low cost to construct. In particular, the barrier 4b has the advantage of being usable as a protection material for the slope of a regulating pond. In addition, it is easy to make the sandbags, and the materials used to make them, such as mesh bags, sand, charcoal scraps, and coal powder, are all easily available and cheap, and the barriers 4a and 4b function as replacements. Recovery can also be carried out easily and at low cost.

(Effects of the Invention) Thus, the device according to the present invention can be easily installed at a low cost on golf courses and other lawns, and the pesticides contained in the surface water of the lawn can be reliably and highly efficiently removed. Not only can it be discharged into public waters as environmentally safe wastewater, but the cost required for maintenance is low. Therefore, according to this invention, while protecting lawn vegetation through the use of pesticides as before, pesticide contamination of public water is prevented, so the effect of contributing to improving national health through lawn creation is extremely significant. .

[Brief explanation of drawings]

FIG. 1 is a plan view showing the main part of a golf course to which an embodiment of the device according to the present invention is applied. FIG. 2 is a plan view showing the vicinity of the water collection pond at the golf course shown in FIG. FIG. 3 is a vertical cross-sectional end view of the water collection basin 2a, and FIG. 4 is a vertical cross-sectional end view of the barrier 4a. l is the collection channel, 2a, 2b are the collection pond, 3 is the noble, 4a, 4
b is a barrier, 5 is a water conduit, 6 is a river, 7 is a cracked stone, 8 is a mouth, and 9 is a discharge port.

Claims (1)

[Claims] In the surface water collection channel 1 due to the topography of the lawn, there are water collection ponds 2a and 2.
b, the downstream of which is connected to a public water body such as a river, and a grain powder composition consisting of 10 to 20% by weight of charcoal waste, coal powder, or a mixture of charcoal waste and coal powder, and the remaining sand is placed in a net bag. Barriers 4a and 4b formed by stacking up capsule bags 3 sealed in
is constructed in water collection ponds 2a, 2b, and at least a part of these barriers 4a, 4b comes into contact with the water in the pond.