JPH10273094A - Sludge processing vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge processing vessel which is capable of performing a processing for immediately making sludge into resources after sludge is collected. SOLUTION: A sludge processing vessel 10 is provided with a vessel body 10a and a dredging device 1 provided on the vessel body 10a. A sludge 11 which is collected from the dredging device 1 and is passed through a filter device 2 is dried in an water removing part 3 and diluted in a dilution/rinse part 6. A water intake is performed in a water intake part 4 and fresh water passed through a fresh water purifying device 5 is delivered to the dilution/rinse part 6. After sludge 11 is repeatingly processed between the water removing part 3 and the dilution/rinse part 6, is demineralized and is passed through a heavey metal eliminating device 7, a water removing/drying processing is performed for sludge in an water removing/drying device 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge processing vessel for processing dredged marine sludge from the sea floor for recycling.

[0002]

2. Description of the Related Art Marine sludge contains salt,
It is difficult to use them effectively as resources. For this reason, conventionally, marine sludge was drought and dried in the sun,
It is also used for land reclamation along the coast and land reclamation after solidification with a solidifying material.

[0003] When recycling marine sludge, it is necessary to remove harmful substances such as salt and heavy metals. Unless these are removed, as a method of disposing of marine sludge, a solidifying material is added and solidification treatment is performed as described above, and the method can be used only for limited uses such as landfill and land development. Therefore, although marine sludge contains a large amount of organic components, it cannot be used for the reduction of green farmland, and it cannot be said that it is being used effectively.

Further, the solidification material used for the solidification treatment is extremely expensive, and it is not economical to use it only for landfill or land preparation, and the demand has not been increased.

[0005]

Judging from the above points, marine sludge can be removed by removing the above harmful substances.
It can be recycled as compost for returning green agricultural land and materials for building materials, and the range of effective use is expanded.

In the case of marine sludge, for example, 100 m
The dredged sludge is sent to the land by a large-diameter pipeline from a dredger ship located offshore to a certain extent, and once received in a reservoir provided on the land side, and then dried on the sun. In such a conventional sludge treatment, a large amount of electric power is required to transport the sludge by the pipeline, and the energy cost becomes extremely high. In addition, although it is necessary to receive sludge once in a reservoir provided on land, storing a large amount of sludge has an extremely large effect on the surrounding environment, such as generating a bad smell. In addition, in order to discharge the treated wastewater to sewage, it is necessary to satisfy the sewage discharge standard,
Subject to major restrictions.

This applies not only to marine sludge, but also to sludge such as lakes and marshes.

[0008] Therefore, if such sludge treatment can be performed immediately after dredging without transporting to land, it is convenient in terms of processing efficiency and environmental aspects.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a sludge processing vessel capable of performing processing corresponding to resource recycling immediately after dredging of sludge.

[0010]

SUMMARY OF THE INVENTION The present invention provides a hull, a dredging device provided on the hull for collecting sludge, a filter device for filtering sludge provided on the hull, and a dewatering and drying method for sludge provided on the hull. A sludge treatment boat comprising: a dewatering / drying device that performs a dewatering / drying operation; and a storage tank provided in the hull for storing sludge that has passed through the dewatering / drying device.

According to the present invention, sludge is collected by a dredging device, and the collected sludge is dehydrated and dried to a predetermined water content in a dehydration / drying device through a filter device. The sludge adjusted to a predetermined moisture content is stored in a storage tank. As described above, sludge treatment such as sludge collection, sludge dehydration / drying processing, and sludge storage can all be performed on the hull.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a sludge treatment boat 10 according to the present invention includes a hull 10a, and a dredge device 1 is disposed on the hull 10a.

The dredging device 1 is a sludge (marine sludge).
This is a device for recovering 11 from the bottom of the ocean 12, and comprises a dredging pump, a compressed air transfer device, a glove, and the like. A filter device 2 connected to the dredging device 1 is provided on the hull 10a. This filter device 2
The pretreatment removes large sand and foreign matter contained in the sludge 11. The pore size of the filter of the filter device 2 is determined by a critical dimension that does not adversely affect each device in the subsequent process.
It is set for each purpose within a range of 0 mm.

A dewatering section 3 and a dilution link section 6 connected to the filter device 2 are provided on the hull 10a.

The dewatering section 3 dehydrates the sludge 11 as a pretreatment for removing salt from the sludge 11 by a dilution method, and also dehydrates the water-containing sludge 11 diluted and rinsed by adding fresh water in the dilution rinsing section 6. Is what you do. In the case of dehydrating the diluted and rinsed hydrous sludge 11, dehydration is repeated until the salt content becomes 0.1% or less. The dilution rinsing unit 6 has a built-in tank and a stirrer, and the dewatering unit 3 and the dilution rinsing unit 6 constitute desalination devices 3 and 6.

A water intake device 4 and a fresh water purification device 5 are provided on the hull 10a. Among them, the water intake device 4 is a device for pumping seawater used as fresh water for dilution and rinsing necessary for desalination of the sludge 11. The fresh water purifying apparatus 5 purifies fresh water from seawater, and as a desalting method, an electrodialysis method, an electrodialysis method, an ion exchange method, or the like can be adopted according to local circumstances.

On the hull 10a, a heavy metal removing device 7 connected to the dilution rinsing section 6 and a dewatering / drying device 8 are sequentially provided. Among them, the heavy metal removing device 7 is a device used when the harmful heavy metal is contained in the sludge 11, and can remove the harmful heavy metal from the sludge 11 by applying a superconducting magnetic separation technique. Further, depending on the type of heavy metal, the heavy metal removing device 7 can remove sludge 11 by an electrodialysis method after acidifying the sludge 11 to a pH value of 4 or less. In any case, the heavy metal removing device 7 has a performance of removing heavy metals below the legal regulations.

The sludge 1 that has passed through the heavy metal removing device 7
Since the water content of No. 1 is about 98%, the water content is too much to make it a resource. For this reason, the sludge 11 is dehydrated and dried by the dehydration / drying device 8 so as to have a water content suitable for the purpose of recycling. As the dewatering / drying device 8, a centrifugal dewatering device or a rotary filter can be used, or a centrifugal thin film dryer may be used.

In order to compost sludge 11,
The sludge 11 is dehydrated so that the water content becomes 50% to 70%.
It is desirable to adjust the drying. When sludge 11 is processed into building materials such as bricks and tiles, the water content is 70% to 9%.
If the dehydration and drying are adjusted to 0%, the molding process is facilitated, which is convenient.

Further, the hull 10a is provided with a storage tank 9 for storing the dried sludge 11 prepared as a resource material in the ship until landing.

Next, the operation of the embodiment having the above-described configuration will be described with reference to FIG.

As shown in FIG. 2, the sludge 11 is collected by the dredge device 1 provided on the hull 10a, and the sludge 11 is removed through the filter device 2 in the sludge 11. Next, the sludge 11 enters the dewatering unit 3 and is dewatered, and becomes the dewatered sludge 11 and enters the dilution / rinsing unit 6.

On the other hand, seawater is taken in by the water intake device 4, and the seawater is desalinated in the freshwater purification device 5 to become freshwater and sent to the dilution / rinsing section 6.

In the dilution / rinsing section 6, fresh water is added to the dewatered sludge 11 to dilute the salt, and then the diluted sludge 11 returns to the dewatering section 3 and is dewatered again. The dehydrating step in the dehydrating section 3 and the dilution / rinsing section 6
Is repeated a plurality of times, during which the salt content in the sludge 11 decreases to 0.1% or less.

The sludge 11 thus desalted is:
Next, it is sent to the heavy metal removing device 7,
, Heavy metals in the sludge 11 are removed. Thereafter, the sludge 11 enters the dewatering / drying device 8 and is dewatered and dried, and the water content is adjusted according to the purpose of use. After that, the sludge 11 whose water content has been adjusted is stored in the storage tank 9.

After the processing vessel 10 arrives on land, the sludge 11 in the storage tank 9 is discharged, and the sludge 11 is composted or used as a building material.

As described above, according to the present embodiment, desalination, dehydration, and heavy metal processing can be performed on the hull for recycling sludge, thereby improving the processing efficiency and the production efficiency of raw materials for resource recovery. be able to. In addition, since sludge is treated at sea, there is no adverse odor or influence on the living environment.

In the above embodiment, the processing vessel 1
Although the example in which the marine sludge 11 is processed by 0 is shown, the invention is not limited thereto, and the processing boat 10 may process a river sludge or a lake sludge. When treating river sludge or lake sludge, the dewatering unit 3, dilution / rinsing unit 6, water intake unit 4, and fresh water purification unit 5 in FIG. 1 are not necessarily provided.

Second Embodiment Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment shown in FIGS. 3 and 4, the same parts as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description is omitted.

Referring to FIG. 2, a processing vessel 10 according to the present invention
Has a hull 10a, on which a dredging device 1, a filter device 2, a desalination device 13, a heavy metal removing device 7, a dewatering / drying device 8, and a storage tank 9 are sequentially arranged.

The dredging device 1 includes a sludge 11
Is collected from the bottom of the ocean 12, and is composed of a dredging pump, a compressed air transfer device, and the like. Further, the filter device 2 is a device for pretreating and removing large sand and foreign matter contained in the dredged sludge 11. The filter of the filter device 2 is made of stainless steel, and its pore size is determined by a critical dimension that does not adversely affect each device in the subsequent process, but is 1 mm in accordance with the specification of a workpiece to be recycled.
It is set for each purpose within a range of 10 to 10 mm. The filter device 2 has a structure capable of backwashing.

The desalination device 13 is for desalting sludge 11. As a desalting method, an electrodialysis method, an electroosmosis method, an electrolytic dialysis method, a heat regeneration ion exchange method, or the like is used as a local event. It can be adopted together. In addition, the desalting device 13 can remove the salt in the sludge 11 to 1% or less.

The heavy metal removing device 7 is used when the sludge 11 contains harmful heavy metals. The heavy metal removing device 7 can remove heavy metals by applying a superconducting magnetic separation technique. Further, depending on the type of heavy metal, the sludge 11 may be removed by electrodialysis after the sludge 11 is acidified to a pH value of 4 or less. In any case, the heavy metal removing device 7 can remove heavy metals up to the legally regulated value or less.

Since the water content in the sludge 11 is about 90%, there is too much water to turn it into a resource, and the dewatering / drying unit 8 converts the sludge 11 to a water content suitable for the purpose of recycling. Dehydrate or dry. In this case, a centrifugal dehydrator or a rotary filter can be used for dehydration, and a centrifugal thin film dryer capable of changing the motor rotation speed by an inverter power supply is suitable for drying.

In order to convert sludge 11 into compost,
It is desirable to adjust the water content to 50% to 70%. When the sludge 11 is processed into a building material such as a brick or a tile, adjusting the water content to 70% to 90% facilitates the forming process, which is convenient.

Next, the operation of the present embodiment having such a structure will be described with reference to FIG. As shown in FIG. 4, the sludge 11 is collected by the dredging device 1 provided on the hull 10 a, and the sludge 11 is removed through the filter device 2 in the sludge 11. Next, sludge 11
Enters the desalination unit 13 and is desalinated, and the salt in the sludge 11 is removed until it becomes 1% or less.

Next, when there is a heavy metal in the sludge 11, the heavy metal in the sludge 11 is removed in the heavy metal removing device 7. Thereafter, the sludge 11 enters the dewatering / drying device 8 and is dehydrated or dried according to the purpose of use.
The moisture content inside is adjusted. Thereafter, the sludge 11 having the adjusted moisture content is stored in the storage tank 9 and used as a compost material or a building material.

In the above embodiment, the processing vessel 10
Although the example in which the marine sludge 11 is further processed is shown, the invention is not limited thereto, and the processing boat 10 may process a river sludge or a lake marsh. In this case, the desalination device 13 is not necessarily provided in FIG.

Next, a modification of the second embodiment will be described with reference to FIGS. The modification shown in FIG. 5 and FIG. 6 has the desalination device 13 and the heavy metal removal device 7 arranged in reverse, and the rest is substantially the same as the embodiment shown in FIG. 3 and FIG.

In this case, as shown in FIG.
After removing the heavy metals therein by the heavy metal removing device 7, the sludge 13 may be desalted by the desalting device 13 after dehydration by a dehydrating section (not shown).

[0042]

As described above, according to the present invention, after sludge is collected, a process for sludge recycling is immediately performed, thereby improving the processing efficiency and the production efficiency of the raw material for recycling. be able to. Further, since the sludge is processed on the hull, the hull can be separated from the living environment, so that the living environment is not deteriorated due to odor or the like.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a sludge processing ship according to the present invention.

FIG. 2 is a view showing the operation of the first embodiment of the sludge processing ship according to the present invention.

FIG. 3 is a view showing a second embodiment of a sludge processing ship according to the present invention.

FIG. 4 is a view showing the operation of the second embodiment of the sludge processing ship according to the present invention.

FIG. 5 is a view showing a modification of the sludge processing ship according to the present invention.

FIG. 6 is a view showing the operation of a modified example of the sludge processing ship according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 dredging device 2 filter device 3 dehydration unit 4 water intake device 5 fresh water purification device 6 dilution / rinse unit 7 heavy metal removal device 8 dehydration / drying device 9 storage tank 10 processing boat 10a hull 11 sludge 12 ocean

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shigeru Shiba 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Pref.

Claims (5)

[Claims] 1. A hull, a dredging device provided on the hull for collecting sludge, a filter device provided on the hull for filtering sludge, a dehydration / drying device provided on the hull for dehydrating and drying sludge, and a hull. And a storage tank for storing sludge that has passed through a dewatering / drying device. 2. A method according to claim 1, further comprising the steps of:
2. A sludge treatment vessel according to claim 1, further comprising a desalination device for desalinating sludge. 3. The sludge treatment vessel according to claim 2, wherein the desalination apparatus has a dehydration section for dehydrating the sludge and a dilution rinsing section for diluting the sludge dehydrated in the dehydration section with fresh water. 4. The sludge treatment vessel according to claim 2, wherein the desalination apparatus desalinates sludge by electrodialysis, reverse osmosis, or electrodialysis. 5. A filter device and a dehydrating / drying device,
2. The sludge processing ship according to claim 1, further comprising a heavy metal removing device for removing heavy metals in the sludge.