JPS6022154B2 - Drainage and rainwater collection equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wastewater and rainwater collection device, and its purpose is to collect wastewater (especially non-oil-containing wastewater) and rainwater on the premises of various facilities such as factories and use it as industrial water. It is.

Japan has long been said to be a country with an ancient history and an abundance of water, but with the rapid development of industry and population growth, the need for water has increased, making it difficult to meet demand with natural water alone.

For this reason, in industry, cooling water is recycled,
Treated water obtained by purifying wastewater such as sewage through biological treatment such as activated sludge method is reused. The amount of water used is expected to increase year by year, so securing the amount of water used is an important issue. In order to solve this problem, the present inventors investigated the relationship between irrigation water and drainage, and researched ways to circulate and use limited military raw water and methods for utilizing rainwater.

The main object of the present invention is to collect wastewater that does not contain oil, that is, non-oil-containing wastewater and rainwater, and reuse it as water for use.

In factory wastewater measures, rainwater accounts for about 40~40% of the total wastewater volume.
It accounts for 60%, and the drainage equipment is approximately 2-2% during normal operation.
．． It is customary to install one with five times the capacity. However, according to the present invention, a portion of rainwater is collected and used, so that the original drainage equipment can be downsized. In the present invention, the ground surface is formed of a water-permeable layer, and a water collection basin whose wall is made of an impermeable material is provided below the water-permeable layer, and the upper end of the peripheral side wall of the water collection tank is and,
A water intake tank that is aligned with the peripheral edge of the water-permeable layer and whose bottom and side walls are made of a water-permeable material is disposed inside the water collection tank, and the water intake tank is located inside the water collection tank and has a bottom surface and a side wall formed of a water-permeable material. The outside of the tank is filled with earth and sand having a low effective water content, and a drainage and rainwater collection device is provided, in which a means for pumping up water is provided from the inside of the water intake tank to the ground surface above the permeable layer. be.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. In the figure, the flow of drainage and rainwater is indicated by arrows. First, in the present invention, the ground surface is formed by a water-permeable layer 5.

The thickness, strength, porosity, etc. of the layer are selected depending on the purpose. Porous asphalt concrete is preferred as the water permeable material used here. Porous asphalt concrete is made of small particle size aggregate and is based on the weight of the aggregate.
% asphalt, generally with a porosity of 20-45%
has. Note that crushed stone is preferred as the aggregate, but sand,
Gravel, metal particles, coke, etc. can be used alone or in combination. The particle size of the aggregate is preferably about 1.5 to 10 ribs.Asphalt functions as a binding material, and various types such as straight asphalt, flown asphalt, and cat blown asphalt can be used. As binding aids, for example, natural or synthetic rubbers (rubber latex is particularly preferred), eboxy resins, etc. can be mixed. If the porosity of porous asphalt concrete is less than 20%, the water permeability will be insufficient, and if it exceeds 45%, the strength will be insufficient, which is not preferable. Composition of porous asphalt concrete 1
For example, 10 parts by weight of crushed stone with a grain size of 2.5 to 5 ribs, 6 parts by weight of filler (calcium carbonate), 4 parts by weight of asphalt.
There is one that consists of 5 parts by weight and has a porosity of 35%. on the other hand,
Any means for guiding non-oil-containing wastewater to a water collection pond may be used, such as providing a drainage ditch or installing a conduit above or underground. In this case, it is preferable to be able to adjust the amount of water inflow. Below the water-permeable layer 5, there is a water collection pond 2 whose walls are made of a water-impermeable material.

This water collection pond 2 is used for factories, schools, hospitals, housing complexes, playgrounds, etc.
In addition to baseball fields, sports fields, sports facilities, and other various facilities are constructed by excavating a portion of the site above the floor plate 1. The impermeable material forming the water collection pond 2 is concrete,
Any material can be used, such as asphalt, metal plate, synthetic resin plate, or synthetic resin sheet, but a material with high flexibility, such as silt cement, is preferred because it has excellent workability. The size and shape of the catchment pond should be selected appropriately, taking into consideration the surrounding conditions.
Further, the upper end of the peripheral side wall of the water collection basin 2 coincides with the peripheral green part of the water permeable layer 5.

Blocks 6 and the like are arranged around the water collection pond 2 on the ground to make it slightly higher than the ground surface. Furthermore, a water intake tank 3 whose bottom and side walls are made of a water-permeable material is disposed inside the water collection basin 2.

FIG. 2 is an explanatory diagram showing details of the water intake tank 3.

The intake tank will be placed about 20 to 30 degrees above the bottom of the water collection basin, and the space will be filled with crushed stone or gravel. The bottom and side walls of the water intake tank are made of water permeable material 7. As the water-permeable material, the above-mentioned porous asphalt concrete is preferred.
The size, shape, etc. of the water intake tank will also be determined as appropriate, taking into consideration the purpose of use and other factors. It is not preferable to use a reinforced concrete perforated pipe as a water intake tank because the flow rate of water from the hole is high and the inflow of earth, sand, sediment, etc. is unavoidable.
When porous asphalt concrete is used, water permeates from the entire surface of the tank, and the inflow rate can be adjusted as desired, and it is easy to achieve a rate of 3 skins/sec or less, which was previously considered impossible.

Even if the inflow speed is slow, the amount of inflow will not decrease because it can flow from the entire surface of the mill. In addition, when arranging the water intake pipe 13 in the water intake tank 3, it is desirable that the gradient is 1/500 or less and the average flow velocity at the outflow end is 0.3 h/sec or less.

It is desirable that the side wall surface of the water intake tank 3 is made of an impermeable material v, for example, a reinforced concrete layer 8 above the lowest groundwater level to prevent intrusion of wastewater that has not been sufficiently purified.

Also, for the same reason, the side walls of the water intake tank should be at least 30 degrees higher than the ground surface. The inside of the water collection pond 2 and the outside of the water intake tank 3 are filled with earth and sand having a small amount of effective moisture. Such soil includes gravel, fine sand, coarse sand, and fine sand. The reason why the soil layer 4 is formed in the water collection pond is to effectively utilize the underground self-cleaning effect of soil microorganisms and the like. Note that, prior to filling this earth and sand, it is preferable to fill the periphery of the water intake tank 3 with crushed stone or gravel, gravel, and coarse sand in this order from the inside to the outside so that mulberry water can be easily absorbed. Further, water pumping means is provided from the inside of the water intake tank 3 toward the ground surface above the permeable layer 5.

Specifically, a water pump 9 is used as such water pumping means, and water is sent to a water storage tank or the like by this water pump 9. It is preferable that the water pump has an automatic level switch type, and the water intake point 1 at the tip is wrapped in a mesh-like permeable material (wire mesh, synthetic resin mesh, cloth, etc.), and if necessary, a chlorine sterilization tank 11 is installed. establish.

Moreover, a blind cover 12 can be attached to the husband end of the water intake tank exposed to the ground surface to improve the water pumping capacity. Since the water quality required for industrial water is almost the same as for drinking water, sufficient consideration is required when collecting and using non-oil-containing wastewater or rainwater. In the present invention, since the lower layer of the permeable ground surface is a soil layer, drainage water and rainwater are naturally purified as they move downward. Furthermore, when this water enters the water intake tank, it is also purified by earth and sand. Therefore, the water pumped from the water intake tank can be fully used as industrial water. Therefore, the device of the present invention can be applied to various facilities such as factories, schools, and hospitals in various industries, but it is particularly effective when applied to oil refineries, petrochemical plants, etc.

That is, since the premises of refineries and the like are regulated to have 10% or more of them as green belts, a large amount of money is required for the accompanying water sprinkling equipment construction. If the device of the present invention is adopted, this water sprinkling equipment becomes unnecessary or can be reduced in size. Similarly, rainwater drainage construction costs can also be reduced.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, and FIG. 2 is a detailed explanatory diagram of a water intake tank. In the figure, 2 is a water collection pond, 3 is a water intake tank, 4 is a sediment layer, and 5 is a permeable layer. Diagram 2

Claims (1)

[Claims] 1. The ground surface is formed of a permeable layer, and a water collection basin whose wall is made of an impermeable material is provided below the water permeable layer, and the upper end of the peripheral side wall of the water collection tank and the above-mentioned A water intake tank is provided inside the water collection basin, the bottom surface and the side wall of which are made of a water permeable material, the water intake tank being aligned with the peripheral edge of the water permeable layer; An apparatus for collecting drainage and rainwater, wherein the outside of the tank is filled with earth and sand having a low effective water content, and a pumping means is arranged from inside the water intake tank to the ground surface above the permeable layer.