JPH05253562A - Sewage disposal method and sheet of waste treatment plant - Google Patents

Abstract

PURPOSE:To easily perform burying work, in a waste disposal plant wherein waste beds and sandy soil beds are alternately formed, by together using a sheet adsorbing heavy metals contained in sewage when each of the sandy soil beds is formed. CONSTITUTION:In a waste disposal plant formed by alternately forming waste beds with a definite thickness and sandy soil beds with a definite thickness, a sheet adsorbing heavy metals contained in sewage is together used when each of the sandy soil beds is formed. By this constitution, the heavy metals contained in the sewage penetrating in the waste disposal plant by natural precipitation are adsorbed by the adsorbing sheet and only purifed water flows out of the drain pipe of the lowermost bed. Since an adsorbent 3 for heavy metals is uniformly received in the spaces formed by two permeable base cloths 1, 1' and partition materials 2 in this adsorbing sheet, only by together using this sheet at the time of the formation of each of the sandy soil beds, a uniform layer having heavy metal adsorbing function can be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating sewage containing heavy metals and the like discharged from a waste treatment plant, and a sewage treatment sheet.

[0002]

2. Description of the Related Art Generally, a treatment plant for treating waste that cannot be incinerated is formed by alternately repeating a waste layer having a certain thickness and a sandy soil layer except the ocean to form alternating layers. Wastewater containing heavy metals, etc. generated by the infiltration of wastewater into the treatment plant is stored in the aquarium through the underground drainage pipe installed in the lowest layer of the treatment plant, and is secondarily disposed of at regular intervals. It was discharged into a river.

[0003]

However, in this method, (1) it is very costly to construct a water tank and a wastewater treatment facility in consideration of a large amount of wastewater generated by heavy rain and to secondarily dispose of the generated wastewater. (2) With the passage of time, underground drainage pipes and water tanks will deteriorate and pollution of downstream areas will occur due to water leakage. There were problems such as.

[0004]

Means for Solving the Problems As a result of research conducted by the present inventors in order to solve the above-mentioned problems, as a result, a partition made of a plate-like material is sandwiched between two sheets of water-permeable base cloth, and these are formed. It has been found that the above problems can be solved if the sewage treatment is completed by using an adsorption sheet containing an adsorbent that adsorbs heavy metals, etc. in the space to be formed when the sandy soil layer is formed. is there.

As the base cloth used here, when a material that decomposes in soil is used, the sheet and the partition decompose over time, and only the adsorbent that has adsorbed heavy metals and the like remains in the ground. Also, when construction work or the like will be performed in the future, earth work and residual soil treatment will be easy, which is preferable, and examples thereof include cellulose fiber woven and knitted fabrics, nonwoven fabrics, and paper.

Also, the plate-like material forming the partition preferably has a property of easily corroding and decomposing in soil for the same reason as above, and examples thereof include woven and knitted cellulose fibers, non-woven fabrics, paper and water-soluble films. Be done. Further, the shape of the plate-like material that forms the partition is not particularly limited in the production of this product.

As an adsorbent for adsorbing heavy metals and the like, microporous metal oxides such as activated carbon and zeolite are preferable from the viewpoint of adsorption ability, and the finer the particle size of these adsorbents, the larger the surface area. Since the adsorption effect is thought to increase, the particle size should be 5 mm or less, preferably 1 mm.
The following are good:

[0008]

[Operation] Sewage containing heavy metals and the like that permeates the waste treatment plant due to natural rainfall reliably contacts the adsorbent in the adsorbent sheet while passing through the adsorbent sheet that is also used when forming the sandy soil layer. However, heavy metals are adsorbed and only purified water is discharged.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wastewater treatment method and a treatment sheet for a waste treatment plant according to the present invention will be described below with reference to the accompanying drawings.

1 and 2 are a top view and a sectional view of an adsorption sheet for heavy metals according to the present invention.

Here, rayon fabrics having a basis weight of 100 g / square meter and 50 g / square meter are used as the base fabrics 1 and 1 ', respectively, and the partition member 2 has a cell diameter of 38 mm,
A paper honeycomb having a height of 15 mm was used.

As the adsorbent 3 for heavy metals, activated carbon having a particle size of 1 to 3 mm is used, and the amount of activated carbon spread is 20.
It was set to 00 g / square meter.

Table 1 shows the adsorption effect of various heavy metals when the adsorption sheet of the present invention such as heavy metals is used.

[0014]

[Table 1]

The above data is obtained by sprinkling a heavy metal stock solution set to a predetermined concentration on a sheet for 30 minutes in an amount corresponding to a rainfall of 10 mm per hour, and measuring the concentration of the treated solution after passing through the sheet. is there.

FIG. 3 shows a method for treating sewage in a waste treatment plant using an adsorption sheet for heavy metals according to the present invention. As shown in this figure, when a sandy soil layer is formed in a waste treatment plant where a waste layer and a sandy soil layer are repeatedly formed, the adsorption sheet such as heavy metal of the present invention is used to Heavy metals contained in the sewage that permeates the waste treatment plant due to rainfall and the like are adsorbed by the adsorption sheet layer, and only purified water flows out from the drainage pipe in the lowermost layer.

[0017]

As described above, the adsorption sheet for heavy metals according to the present invention uniformly stores the adsorbent in the space formed by the two water-permeable base cloths and the partition, so that the sandy soil layer is not formed. It is possible to form a uniform layer having an adsorbing action for heavy metals and the like only by using this sheet together when forming,
Moreover, since it is in the form of a sheet, the burying work becomes very easy.

[Brief description of drawings]

FIG. 1 is a top view of a suction sheet of a heavy metal or the like.

FIG. 2 is a side view of a suction sheet of heavy metal or the like.

FIG. 3 is a diagram of a usage example of a suction sheet of a heavy metal or the like.

[Explanation of symbols]

 1,1 'Base cloth 2 Partition material 3 Adsorbent such as heavy metal 4 Waterproof sheet 5 Gas vent 6 Adsorption sheet for heavy metal 7 Sandy soil layer 8 Waste 9 Underground drainage pipe

[Table 1]

Front Page Continuation (72) Inventor Tadayoshi Onuma 1-62 Minami-Goho, Kizu-cho, Kizu-cho, Soraku-gun, Kyoto Prefecture (72) Akio Toki 4-21-3 Koyodai, Hannan-shi, Osaka

Claims (5)

[Claims] 1. A waste treatment plant comprising alternating layers of a waste layer and a sandy soil layer of a certain thickness that are alternately repeated to form a sandy soil layer, which is included in sewage. A method for treating sewage at a waste treatment plant, which is characterized in that a sheet for adsorbing heavy metals is also used. 2. A sheet for adsorbing heavy metals and the like is sandwiched by a partition made of a plate-like material between two sheets of water-permeable base cloth,
A wastewater treatment sheet for a waste treatment plant, characterized in that an adsorbent for adsorbing heavy metals and the like is housed in the space formed by these. 3. The wastewater in the waste treatment plant according to claim 2, wherein the two base fabrics are woven and knitted fabrics, non-woven fabrics and papers made of fibers having a property of easily corroding and decomposing in soil. Processing sheet. 4. The plate-shaped material forming the partition is a woven or knitted material, a non-woven fabric, paper or a water-soluble film, etc. made of fibers having a property of easily corroding and decomposing in soil, and the shape of the partition is arbitrary. The sewage treatment sheet of the waste treatment plant according to claim 2, characterized in that. 5. The waste treatment according to claim 2, wherein the adsorbent is activated carbon having a particle size of 5 mm or less, preferably 1 mm or less, or a fine porous metal oxide alone or a mixture thereof. Sewage treatment sheet for the place.