JP4128481B2 - Landfill method of waste at sea surface disposal site - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a method for landfilling waste at a sea surface disposal site, in particular, a sea surface disposal site filled with waste becomes a landfill site, which is quickly purified and stabilized, and the early use of a site that is environmentally safe and good in geotechnical engineering. It also relates to a method for landfilling waste that can be used at a high level. Here, early use means that the ground reclaimed by waste can be purified and stabilized at an early stage and used as land, and advanced use means that the ground reclaimed by waste becomes a strong ground in geotechnical engineering. It means that advanced use such as port facilities and factories can be made.
[0002]
[Prior art]
The following methods are typical as methods for landfilling waste at sea surface disposal sites.
[0003]
[1] One-sided landfill [0004]
A landfill method in which waste is pushed away from land-filled locations.
[0005]
[2] Thin layer landfill [0006]
A landfill method that spreads in layers so as not to destroy the soft layer at the bottom of the disposal site and to reduce the uneven settlement of the soft layer.
[0007]
[3] Land reclamation [0008]
A landfill method in which the disposal site is divided into small sections.
[0009]
The landfill methods listed in [1] to [3] are methods from the viewpoint of efficiently and efficiently landfilling wastes in large quantities. On the other hand, the following attempts have been made from the viewpoint of early purification and stabilization of landfilled waste.
[0010]
[4] Device of landfill method [0011]
The portion of the sea surface disposal site that is submerged in water (retained water) will be filled with stable waste that does not contain pollutant components that delay the stabilization by submerging. When landfilling proceeds and landed, managed waste is landfilled in the same way as land disposal sites.
[0012]
[5] Device after landfill [0013]
When the landfill is progressed and landed to some extent, a culvert for collecting the collected water will be installed near the level of the retained water. By pumping the retained water, it is possible to expect removal of the pollutant components, washing out the pollutant components, and supply of air to the waste layer, which promotes purification and stabilization of the waste layer.
[0014]
In addition, regarding the sea surface landfill method for classification of incineration bottom ash discharged from the incineration facility, more specifically, the necessary treatment is performed before landfilling of the incineration bottom ash, and the advanced use plan is partially used as a site after completion of landfill. Also known is a sea surface reclamation method (Patent Document 1).
[0015]
[Patent Document 1]
JP 2002-79207 A (page 1 to page 3, FIG. 1).
[0016]
[Problems to be solved by the invention]
However, since the waste landfilled in the sea surface disposal site is submerged in the water held in the sea surface disposal site, the elution and decomposition of the pollutant components from the waste becomes slow, and the purification and stabilization of the waste is delayed. Furthermore, as landfill disposal proceeds, the amount of retained water with respect to waste decreases, so the concentration of contaminated components of retained water increases.
[0017]
In an actual sea surface disposal site, the concentration of polluted components at the initial stage of landfill is lower than the planned raw water of the sewage treatment facility, and the concentration of polluted components increases rapidly in the later stage of landfill. Therefore, the removal of the contaminated components out of the system by the sewage treatment is hardly performed in the initial stage of landfill, and the purification and stabilization of the waste is delayed.
[0018]
It has also been reported that sewage treatment must be continued for several times as long as the landfill has been in operation since the landfill has been completed. The various organizations that operate the sea surface disposal site are anxious for the early purification and stabilization of the waste landfilled at the sea surface disposal site.
[0019]
In other words, it takes a very long period of time to purify and stabilize waste at sea level disposal sites. This greatly restricts the use of the disposal site and leads to an increase in maintenance costs. This solution is a major issue for sea level disposal sites.
[0020]
The inventor conducted (1) an experiment in which an incineration residue was introduced into a two-dimensional water tank containing seawater, and obtained the following results.
[0021]
(1) When waste such as incineration residue is thrown into seawater, flocs are formed due to the high cohesiveness of the waste itself, so the thrown waste is classified (separated) into floating mud, sand and gravel. )It's easy to do.
[0022]
{Circle around (2)} The classified floating mud tends to aggregate further and form a floc.
[0023]
(3) The suspended mud and floc contain high-concentration pollutants.
[0024]
(4) The particle size distribution of the two is different due to the classifying action accompanying sedimentation. In particular, the sand and gravel contains only a small amount of fine particles.
[0025]
(2) A large-scale field experiment was conducted in which a water flow was generated in a pound (pond) filled with seawater and incineration residue was added, and the following results were obtained.
[0026]
In addition to (1) to (4) above, (5) the permeability coefficient of sand and gravel is more than 10 times that of floating mud and floc, and the ground consisting of sand and gravel is highly permeable.
[0027]
From these results, the inventors have:
(A) Add water to waste and classify it into floating mud, sand and gravel.
[0029]
(B) Separate each and fill in separate sections in the disposal site.
[0030]
(C) Actively treating sewage containing floating mud from the initial stage of landfill.
[0031]
(D) The separated floating mud and sludge should be pretreated if necessary.
[0032]
Found that it contributes to the early use of the site of the sea surface disposal site by promoting the purification and stabilization of waste. The present invention has been made based on such findings.
[0033]
[Means for Solving the Problems]
The landfill method of the waste at the sea surface disposal site of the present invention includes a classification step of adding water to the agitation and stirring, a step of sending the sand and gravel classified by the classification step to a normal landfill section, and a floating mud The method includes a step of sending sewage containing water to a sewage treatment facility in an amount that can be treated by the sewage treatment facility, and sending the remaining sewage to a special landfill section.
[0034]
Here, the normal landfill section is a landfill mainly composed of sand and gravel, and the waste is purified and stabilized earlier than the conventional landfill board, resulting in a good landfill site in terms of geotechnical engineering. Therefore, early use and advanced use of landfills can be expected.
[0035]
The special landfill section is a landfill mainly composed of floating mud. Since the suspended mud is mainly composed of fine particles, the special landfill section tends to be a soft landfill, and since the concentration of contaminated sewage is high, the same maintenance management as that of the conventional sea surface disposal site is required. Therefore, special landfills can be used for green spaces and parks.
[0036]
The present invention is further characterized by further comprising a step of carrying out the sludge from the sewage treatment facility outside the disposal site or a step of sending it to the special landfill section.
[0040]
Further, the present invention is characterized in that in the classification step, flocs are formed due to the high cohesiveness of the waste itself.
[0041]
The sewage treatment facility of the present invention further includes a step of treating sewage from the normal landfill section and the special landfill section.
[0042]
In the present invention, the water added to the waste is seawater outside the disposal site, retained water in a normal landfill section, retained water in a special landfill section, treated water discharged from a sewage treatment facility, and a mixture thereof. It is one of water.
[0043]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0044]
(First embodiment)
[0045]
In FIG. 1, 1 is a soil transporter, 2 is a water supply device, 3 is a stirring tube, 4 is a classification device, 5 is a slurry transport tube, 6 is a normal landfill section, 7 is a slurry transport tube, 8 is a wastewater treatment facility, Special landfill, A is waste.
[0046]
▲ 1 ▼ When not pre-processing [0047]
In the first embodiment of the present invention, as shown in FIGS. 1 and 2, water is added to the waste by the water adding device 2 to make a slurry. Slurry waste is placed in tube 3 and sent with stirring. The waste agitated in the pipe 3 is classified into sand, gravel and floating mud by the classifier 4. The separated sand and gravel are sent to the normal landfill section 6 through the pipe 5. Of the separated buoyant mud, the buoyant mud within the treatment capacity of the sewage treatment facility 8 is sent to the sewage treatment facility 8 and processed. The floating mud exceeding the sewage treatment capacity is sent to the special landfill section 9 through the pipe 7. The sludge discharged from the sewage treatment facility 8 is carried out of the disposal site or sent to the special landfill section 9.
[0048]
(Second embodiment)
[0049]
In FIG. 3, 10 is a stirring pound, 11 is a pretreatment facility, and 12 is a slurry transport pipe.
[0050]
(2) When pre-processing [0051]
In the second embodiment of the present invention, as shown in FIG. 3 and FIG. 4, waste is put into a pound 10 filled with water installed in a disposal site. The input waste is stirred in the pound 10 and classified into sand, gravel and floating mud. The separated sand and gravel are usually sent to the landfill section 6. Of the separated buoyant mud, the buoyant mud within the treatment capacity of the sewage treatment facility 8 is sent to the sewage treatment facility 8 via the pipe 12 and processed. The floating mud that exceeds the sewage treatment capacity is sent to the pretreatment facility 11 and pretreated. The pretreated floating mud is sent to the normal landfill section 6 or the special landfill section 9 according to the pretreatment method and its physical properties, or reused as a recycled material. Sludge discharged from the sewage treatment facility is either carried out of the disposal site or sent to a pretreatment facility for pretreatment. The pretreated sludge is carried out of the disposal site, sent to the normal landfill section 6 or the special landfill section 9 according to the pretreatment method and its physical properties, or reused as a recycled material.
[0052]
【The invention's effect】
Since the method for landfilling waste at the sea surface disposal site of the present invention is as described above, the following effects can be obtained.
[0053]
[1] The ground filled with sand and gravel has good water permeability. Therefore, the waste is stabilized earlier than the conventional landfill board. In addition, since the ground consists of sand and gravel, there is little settlement of the ground.
[0054]
[2] Purifying and insolubilizing contaminant components contained in the sludge can be achieved by treating the sludge with sewage or pre-treating it.
[0055]
[3] The wastewater treatment facility can be operated effectively from the beginning of the disposal site.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a first embodiment of a method for landfilling waste at a sea surface disposal site according to the present invention.
FIG. 2 is a flowchart of the first embodiment.
FIG. 3 is an explanatory view showing a second embodiment of the waste landfilling method at the sea surface disposal site of the present invention.
FIG. 4 is a flowchart of the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Soil carrier 2 Water supply equipment 3 Stirring pipe 4 Classifier 5 Slurry transport pipe 6 Normal landfill section 7 Slurry transport pipe 8 Sewage treatment facility 9 Special landfill section 10 Stirring pound 11 Pretreatment facility 12 Slurry transport pipe A Waste

Claims (5)

A classification step of adding water to the waste and stirring,
Sending the sand and gravel classified by the above classification process to a normal landfill section;
A method for landfilling waste at a sea surface disposal site, comprising the step of sending wastewater containing sludge to an amount that can be treated by the wastewater treatment facility, and sending the remaining wastewater to a special landfill area. .   The method for landfilling waste at a sea surface disposal site according to claim 1, further comprising a step of carrying out sludge from the wastewater treatment facility to the outside of the disposal site or a step of sending it to the special landfill section. The method for landfilling waste at a sea surface disposal site according to claim 1 or 2 , wherein in the classification step, flocs are formed by the high cohesiveness of the waste itself. Landfill method of the sewage treatment facility, waste at sea disposal site according to claim 1, 2 or 3, wherein further comprising the step of treating the held water from the normal landfill compartments and special landfill compartments. The water added to the waste is either seawater outside the disposal site, retained water in a normal landfill section, retained water in a special landfill section, treated water discharged from a sewage treatment facility, or water mixed with them. 5. The method for landfilling waste at a sea surface disposal site according to claim 1, 2, 3 or 4 .

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