JP3183768B2 - Sewage purification equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage purification apparatus using soil.

[0002]

2. Description of the Related Art Various methods and apparatuses for performing sewage treatment using microorganisms in soil have been proposed.

[0003] For example, Japanese Patent Publication No. 56-23672, Japanese Patent Publication No. 60-55198 and Japanese Patent Publication No. 1-444394 disclose a porous pipe for supplying sewage at a position close to the ground surface in soil. The surroundings of the perforated pipe are filled with gravel-like material having a capillary action, the sewage is allowed to penetrate into the soil around the gravel-like material, and the microorganisms in the soil purify the sewage. Or collected in a tank provided below the porous tube.

[0004]

However, among the microorganisms useful for purification, aerobic bacteria are known to inhabit most at about 10 cm below the ground surface, and to decrease sharply as they become deeper. For this reason, the purification effect by the aerobic bacteria is limited in the above-described conventional techniques, and a sufficient purpose has not been achieved, for example, with a BOD reduction degree.

[0005] Therefore, an object of the present invention is to provide a soil purification device that improves aeration and promotes the propagation of aerobic bacteria.

[0006]

To solve the above problems SUMMARY OF], in the present invention, the sewage supply perforated tube filled with gravel-like material around arranged on the trench, breathable the trench, water retention is good buried in the soil which is suitable for propagation of aerobic bacteria, the ventilation layer made of porous material beneath said trench is provided in communication with the ventilation layer and the outside air breather, below the ventilation layer
It was made to collect water at.

[0007]

[Function] Sewage penetrates into the soil by the capillary action of the gravel material filled around the perforated pipe.

On the other hand, soil permeability, because water retention is good, is suitable for the propagation of aerobic bacteria, further surface shape by Rukoto provided a ventilation layer leading to the outside air to below the trench
Because it is possible to have a spread, intake and exhaust is wide range
In which well done, aerobic bacteria thrive well deep soil, cleaning effect is enhanced, the gas after decomposed rapidly discharged
Ru is.

[0009]

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

As shown in FIGS. 1 and 2, trenches 2 made of a water-impermeable material such as a synthetic resin plate are buried in a so-called aggregated soil 1 having good air permeability and water retention.
On this trench 2, a perforated pipe 4 around which a gravelly material 3 such as crushed stone is filled is arranged. In order to prevent the gravelly material 3 from dissipating, it is preferable to cover the material 3 with a net 5 or the like. Further, the cross-sectional shape of the trench 2 is not limited to the illustrated U-shape, and may be any shape such as a semicircle or a V-shape. Further, a lower portion of the gravelly material 3 is filled with a filter material 3a having a capillary action and a smaller particle size than that.

The porous tube 4 is for supplying sewage. Therefore, in the trench 2, a large number of small holes are provided in the pipe 4, but the watertight structure is such that sewage does not leak until the pipe 4 is introduced into the trench 2.

[0012] in the soil 1 in the lower the trench 2, the porous material breathable layer 6 is provided planar filled with such pumice
It can be extended. The ventilation layer 6 and the outside air are communicated with each other through an intake / exhaust pipe 7. In order to prevent fine earth and sand from being mixed between the ventilation layers 6 to cause clogging, it is preferable to cover the upper surface with a porous sheet 6a having an appropriate pore diameter. Further, a porous tube 7a may be connected to the lower end of the intake / exhaust tube 7.

A water collecting groove 8 is provided on the lower surface of the soil 1. The water collecting groove 8 is formed of a water-impermeable structure such as concrete, and a water collecting pipe 9 is disposed at a central portion thereof. A large number of through holes 9a are provided around the water collecting pipe 9. In addition, the water collecting groove 8 is filled with a gravel material 8a such as crushed stone having a relatively large particle size, but may be hollow.
In that case, the upper surface of the water collecting groove 8 is preferably covered with a tough perforated plate.

The water collecting groove 8 also serves as a base of the sewage purification device, but the cross-sectional shape thereof is not limited to the V-shape shown in the figure, but can be variously selected, such as a semicircle or a U-shape. .

It is preferable to provide impermeable partition walls 10, 10 on both sides of the water collecting groove 8.

When the primary or secondary treated sewage is supplied from the perforated pipe 4, the effluent once descends into the trench 2 and penetrates into the soil 1 around the trench 2 by the capillary action of the filter medium 3a. This sewage is filtered and adsorbed by the soil 1, but organic matter in the sewage is decomposed by microorganisms. At this time, the aeration layer 6 is spread not only in the vicinity of the surface of the soil 1 but also in a relatively deep portion, so that the aerobic bacteria grow well and the decomposition process is actively performed. The decomposed gas is also quickly discharged through the intake / exhaust pipe 7.

The sewage is further decomposed in the lower soil 1, and the treated water from which organic matter has been almost completely removed is collected in a collecting drain 8.
Collected by This treated water is stored in the water collecting tank 11 as shown in FIG.

When the plant 13 is grown on the surface layer of the soil 1, a better treatment effect can be obtained.

[0019]

[Effect] According to the present invention, as described above, the ventilation layer provided below the trench disposed sewage supply perforated pipe, surface
To allow the air to spread, and because this ventilation layer communicates with the outside air, the air permeability of the soil becomes good,
Since the aerobic bacteria propagate well to the deep part of the soil, the purification power is improved, and the whole apparatus can be made compact.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a sewage purification apparatus of the present invention.

FIG. 2 is a partially cross-sectional perspective view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Soil 2 Trench 3 Gravel material 4 Porous tube 5 Net 6 Ventilation layer 6a Porous sheet 7 Intake / exhaust tube 8 Water collecting groove 9 Water collecting tube 9a Through hole 10 Partition wall 11 Water collecting tank 12 Pump 13 Plant

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C02F 3/00

Claims (2)

(57) [Claims] A sewage supply perforated pipe filled with gravel material is disposed on a trench, and the trench is buried in soil having good air permeability and water retention and suitable for propagation of aerobic bacteria , the ventilation layer made of porous material beneath said trench is provided in communication with the ventilation layer and the outside air breather, below the ventilation layer
Sewage purifier that collects water at 2. The sewage purification apparatus according to claim 1, wherein the upper surface of the ventilation layer is covered with a porous sheet.