JP3753682B2 - Treatment method of sludge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating sludge accumulated at the bottom of a stagnation part of a pond, a lake, a river, or a sea.
[0002]
[Prior art]
Conventionally, sludge at the bottom of this type of pond and the like is treated by methods such as dehydration, heating, and decomposition by microorganisms after being lifted to the ground by picking up buckets or sucking with pumps. .
[0003]
However, when raising sludge from the bottom of a pond to the ground, turbid water is generated by mixing the sludge and water, including inhabiting animals (seafood, insects, etc.) and plants (plants, algae, etc.). There is a problem of adversely affecting the ecosystem.
[0004]
[Problems to be solved by the invention]
This invention makes it a subject to provide the processing method of the sludge which can process the sludge of the bottom parts, such as a pond, in the position in view of the above problems.
[0005]
[Means for Solving the Problems]
In the sludge treatment method according to the present invention, sand is laid (placed) on a sludge layer at the bottom of a pond or the like via a biodegradable sheet or a water-soluble sheet, and a microorganism (bacteria) for decomposing organic matter is It consists of supplying the sludge layer directly or indirectly through attachment to the sheet.
[0006]
The treatment method of the present invention compresses the sludge layer by the load of sand laid through a biodegradable or water-soluble sheet, gradually squeezes out moisture in the sludge layer, and in the sludge layer of microorganisms for decomposing organic matter. The biodegradable sheet or water-soluble sheet gradually decomposes organic matter in the sludge layer by direct supply to the substrate or indirectly through attachment to the biodegradable sheet or water-soluble sheet, while the biodegradable sheet or water-soluble sheet It gradually disappears in the form of decomposition to carbon or dissolution in water, which ultimately deposits sand on the base (basement floor) of a pond, etc., for a relatively long period (eg several months to several The sludge layer drastically decreases or disappears over the years.
[0007]
The microorganisms for decomposing organic matter in the method of the present invention include anaerobic and aerobic microorganism groups (photosynthetic bacteria, methane bacteria, denitrifying bacteria, sulfur bacteria, actinomycetes, yeasts, lactic acid bacteria, acetic acid bacteria, filamentous fungi, nitrifying bacteria. 1) or two or more selected from the above, and useful microorganisms (EM fungi) consisting of dozens of photosynthetic bacteria, actinomycetes, yeasts, lactic acid bacteria, and filamentous fungi are one of the preferred ones. is there.
[0008]
As the biodegradable sheet, biodegradable plastic sheets made from agricultural products such as corn, straw, and aquatic plants can be used, and as the water-soluble sheet, pulp sheets can be used. Moreover, the thickness can select 1 mm-20 mm, for example according to the thickness etc. of the sludge layer to process.
[0009]
As sand, river sand or mountain sand is generally used for ponds, lakes, and rivers, and sea sand is used for the sea. The laying thickness on the biodegradable or water-soluble sheet is the thickness of the sludge layer to be treated. For example, it can be 10 cm to 1 m.
[0010]
For direct supply to the sludge layer of microorganisms for decomposing organic matter, liquid (bio-liquid) cultured in a liquid medium, gel-like (bio-gel) cultured in a solid medium, or these bio-liquid and bio-gel are water-soluble. For application to biodegradable sheets or water-soluble sheets, such as spraying on the sludge layer through the conduits of the capsules (bio-enclosed pieces), insertion into the sludge layer, etc. In addition to impregnation of the sheet, insertion of a biogel or bioencapsulated piece into the sheet is also included.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of treatment of a sludge layer containing an organic substance that can be decomposed by useful microorganisms (EM fungi) will be described with reference to the drawings. First, it should be treated by human power (human power such as a diver when the water depth is deep). On the sludge layer 11 at the bottom of a pond or the like, a biodegradable sheet 12 having an appropriate thickness impregnated with a biofluid of useful microorganisms is placed in an expanded state to cover the sludge layer 11. At this time, if necessary, a plurality of parts of the biodegradable sheet 12 are fixed with anchors or weights are placed on the plurality of parts so that the biodegradable sheet 12 does not move.
[0012]
Subsequently, sand is supplied onto the biodegradable sheet 12 through the conduits, and the sand 13 is laid down to an appropriate thickness, and the sludge layer 11 is covered with the sand 13 via the biodegradable sheet 12. Leave for several months or longer.
[0013]
Within this standing period, the sludge layer 11 is compressed by the load of the sand 13, and the layer thickness decreases with the moisture content, and at the same time, the sludge layer 11 of useful microorganisms attached to the biodegradable sheet 12. The organic matter in the sludge layer 11 is gradually decomposed by the intrusion, and changes into a very small amount of inorganic residue. On the other hand, the biodegradable sheet 12 is gradually biodegraded and disappears. Finally, the sand 13 is deposited on the base to form a sand layer.
[0014]
The method of the present invention can be carried out in various other forms, and is not limited to the above-described form.
[0015]
【The invention's effect】
As described above, according to the sludge treatment method according to the present invention, although the treatment period is relatively long, not only the sludge layer at the bottom of the pond and the like but also the water layer above it is not agitated. Sludge can be treated without adversely affecting the ecosystem including
[Brief description of the drawings]
FIG. 1 is a schematic view of an embodiment of a sludge treatment method according to the present invention.
[Explanation of symbols]
11 Sludge layer 12 Biodegradable sheet 13 Sand

Claims (2)

Sand is laid on a sludge layer at the bottom of a pond or the like via a biodegradable sheet or a water-soluble sheet, and microorganisms for decomposing organic matter are supplied directly to the sludge layer or indirectly through attachment to the sheet. A sludge treatment method. The method for treating sludge according to claim 1, wherein the microorganism for decomposing organic matter is one or more selected from anaerobic and aerobic microorganism groups.

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