JP2001157899A - Bottom mud treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce treatment cost while preventing the environmental aggravation of the circumference and to recycle bottom mud in a bottom mud treatment apparatus. SOLUTION: Bottom mud 11 is sucked from the bottom part of a river by a dredging pipe 21 to be stored in a concentration tank 23 and a flocculant 24 is added to the bottom sludge to sediment concentrated sludge 12 and a flocculant 33 is added to the sludge 12 in a flocculation tank 28 to form flocculated sludge 13 under stirring and a dehydrated cake 14 is formed by a dehydrator 29 and a water absorbent 44 and a solidifying agent 45 are added to and mixed with the dehydrated cake 14 in a granaulation apparatus 30 to granulate the cake to form granules 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sediment treatment apparatus for purifying sludge deposited at the bottom of a water area such as a river, a lake or a dam.

[0002]

2. Description of the Related Art FIG. 3 schematically shows a conventional method of treating bottom mud in a river or the like.

[0003] In the conventional method for treating bottom mud, FIG.
As shown in (1), first, the injection pipe 002 is inserted from the water surface 001 of the river to penetrate the bottom mud 003, and the lime-based improving material 004 is injected into the bottom mud 003 from the tip of the injection pipe 002. After curing in this state for several days to several months, as shown in FIG. 3B, the bottom mud 003 is solidified to form a solidified improved ground 005. Then, when the solidified improved ground 005 is completely solidified, the upper water is drained, and as shown in FIG. 3C, the solidified improved ground 005 is excavated by a hydraulic shovel 006, and the excavated improved soil is loaded on a truck (not shown). Transport to disposal site for disposal.

[0004]

In the above-mentioned conventional method of treating bottom mud, the operation of injecting the solidification agent 004 into the bottom sediment 003 and solidifying it is a work from the water by a work boat, This would be a large-scale operation such as water cutoff. In addition, drainage work after solidification of the bottom mud 003 is also large, and there is a problem that the total construction cost is high.

[0005] Further, since the bottom mud 003 (improved excavated soil) is carried out by excavation with the hydraulic shovel 006, a lime-based improving material 004 is poured into the bottom mud 003 and solidified to ensure excavation. I have. Therefore, the excavated soil (solidified ground 00
5) is stabilized to low strength and cannot be reused and must be disposed of at a treatment plant as industrial waste, which increases the overall construction cost. Further, the bottom mud 003 is highly odorous because it has been deposited on the bottom of a river or the like for a long period of time.
Since the odor spreads around 5 and exacerbates the environment due to excavation, deodorant was sprayed while excavating, but sufficient deodorization is not possible.

The present invention has been made to solve such a problem, and provides a bottom sludge treatment apparatus capable of reducing the treatment cost, preventing the surrounding environment from deteriorating, and enabling the bottom sludge to be recycled. The purpose is to do.

[0007]

According to a first aspect of the present invention, there is provided a treatment apparatus for moving a bottom mud treated water area to suck a bottom mud, A thickening tank that generates concentrated sludge by storing the sludge and adding a flocculant, and generates the flocculated sludge by storing the thickened sludge transported from the thickening tank, adding the flocculant, and stirring. A coagulation tank, a dewatering means for dewatering the coagulated sludge conveyed from the coagulation tank to produce a dewatered cake, and adding and mixing a water absorbing agent and a solidifying agent to the dewatered cake generated by the dewatering means. And a granulating means for forming a granular material by dividing the internal material into particles.

[0008] The apparatus for treating bottom mud according to the second aspect of the present invention is characterized in that deodorant spraying means for spraying a deodorant on the granular material generated by the granulating means is provided. .

In the apparatus for treating bottom mud according to the third aspect of the present invention, the concentration tank, the coagulation tank, the dewatering means,
It is characterized in that each process is performed with the granulating means in a closed state.

In the apparatus for treating bottom mud according to the invention of claim 4, the concentration tank, the coagulation tank, the dewatering means,
An exhaust pipe and an exhaust pump are connected to the granulating means.

Further, in the apparatus for treating bottom mud according to the present invention, an odor filter is attached to a return air opening of the exhaust pipe.

[0012]

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

[First Embodiment] FIG. 1 shows a schematic configuration of an apparatus for treating bottom mud according to a first embodiment of the present invention.

The apparatus for treating sediment of the present embodiment purifies sludge deposited on the bottom of water bodies such as rivers, lakes and marshes and dams. As shown in FIG. 1, a dredger (not shown) capable of moving in a bottom mud treatment water area has a dredging pipe 21, a suction pump 22, and a concentration tank 23. Therefore, by operating the suction pump 22, the bottom mud 11 can be continuously sucked from the bottom of the river by the dredging pipe 21 and stored in the concentration tank 23. Further, the concentration tank 23 is a closed type, and the coagulant 2
4 is provided, and the coagulant adding device 25 has a metering pump (not shown),
A predetermined amount of the flocculant 24 can be added to the concentration tank 23. Therefore, the concentrated sludge 1 is removed from the bottom sludge 11 stored in the concentration tank 23 by the coagulant adding device 25.
2 can be precipitated. Further, the concentration tank 23 is provided with a discharge pipe 26 and a discharge pump 27 for returning the supernatant water after the concentrated sludge 12 has settled to the river.

On the ground side, a coagulation tank 28, a dehydrator 29 and a granulating device 30 are provided. The coagulation tank 28 is a closed type and includes a transport pump 31 and a transport pipe 3.
The concentrated sludge 12 settled in the concentration tank 23 is transported to the coagulation tank 28 by the transportation pipe 32 by operating the transport pump 31, and is stored therein. it can. In addition, this transport pipe 3
2 is connected to the concentration tank 23 on the dredger moving on the water, so that it is flexible and is held on the water by a float (not shown). The coagulation tank 28 has a coagulant addition device 34 for adding a coagulant 33 to the stored concentrated sludge 12 and a stirring blade 35.
The coagulant adding device 34 has a metering pump (not shown), and a predetermined amount of the coagulant 33 can be added to the coagulation tank 28. Therefore, the coagulant sludge 13 can be formed by coagulating the fine particles of the concentrated sludge 12 stored in the coagulation tank 28 by the coagulant adding device 34 and stirring by the stirring blade 35.

The dehydrator 29 is of a closed type belt press type, and a pair of endless belts are movably supported by a plurality of rollers, and are disposed so that the interval between the endless belts becomes gradually narrower on the downstream side. The coagulation tank 28 is connected to the coagulation tank 28 via a conveyance pump 36 and a conveyance pipe 37. Therefore, by operating the transport pump 36, the flocculated sludge 13 in the flocculation tank 28 is transported to the dehydrator 29 by the transport pipe 37, where the flocculated sludge 13 is dehydrated to generate the dewatered cake 14. . Further, the generated dewatered cake 14 is supplied to the dehydrator 29 by the granulating device 3.
And a wastewater treatment device 41 via a transfer pump 39 and a transfer pipe 40.
Are connected. The wastewater treatment device 41 includes a dehydrator 2
At 9, the treated water generated by the generation of the dewatering cake 14 is subjected to a cleaning treatment, and a discharge pipe 42 and a discharge pump 43 for returning the purified water to the river are connected.

The granulating device 30 forms a granular material 15 by adding a water absorbing agent 44 and a solidifying agent 45 to the dewatered cake 14 and mixing them with stirring to thereby break the internal material into particles. The granulating device 30 has a rotary drum 46, in which a stirring blade 47 and a scraper 48 are provided. Further, the granulating device 30 is provided with an input device 49 for feeding the dewatered cake 14 conveyed by the closed conveyor 38 to the rotating drum 46, and respective adding devices 50 and 51 for the water absorbing agent 44 and the solidifying agent 45. And an unloading conveyor 52 for unloading the granular material 15.
The apparatus has a water absorbing agent adding device 50 and a solidifying agent adding device 51, and a metering pump (not shown), so that predetermined amounts of the water absorbing agent 44 and the solidifying agent 45 can be added into the rotating drum 46.

The water absorbing agent is water glass, sodium silicate as a silicate, or an organic water absorbing agent such as a polymer or a monomer. The solidifying agent is cement H, lime, or the like.
It is a gypsum-based solidifying agent.

At the most downstream position of the carry-out conveyor 52, there is provided a deodorant spraying device 53 for spraying the deodorant 16 onto the generated granular material 15. This deodorant 1
As for No. 6, an aqueous solution of ferrous chloride or the like is effective because the granular material 15 is often alkaline and has an ammonia odor.

Here, a method of purifying the bottom mud by the above-described bottom mud processing apparatus of the present embodiment will be described.

First, the suction pump 22 is operated by the dredge, and the bottom mud 11 is continuously sucked from the bottom of the river by the dredge pipe 21 and stored in the concentration tank 23. At this time, bottom mud 1
1 is conveyed to the closed concentration tank 23 without being exposed to the atmosphere, so that the odor of the bottom mud 11 does not leak outside. The bottom mud 11 dredged from the river has a high water content of several thousand% or more.
A coagulant 24 is added to the bottom mud 11 in the
The concentrated sludge 12 having a water content of 1000% or less is precipitated at the lower portion by aggregating the fine particles of No. 1.

Next, the transporting pump 31 is operated to transport the concentrated sludge 12 settled in the concentration tank 23 to the coagulation tank 28 disposed on the ground side via the transport pipe 32. on the other hand,
The supernatant water in the concentration tank 23 is returned to the river by the discharge pipe 26 by operating the discharge pump 27. Then, the flocculant 33 is added to the concentrated sludge 12 in the flocculation tank 28 by the flocculant adding device 34 and stirred by the stirring blades 35, and the fine particles of the concentrated sludge 12 are agglomerated.
To form coagulated sludge 13 having a water content ratio of

Subsequently, the conveying pump 36 is operated to convey the coagulated sludge 13 in the coagulation tank 28 to the dehydrator 29 via the conveying pipe 37. In the dehydrator 29, the coagulated sludge 13 is dewatered to 200% A dehydrated cake 14 having the following water content ratio is generated. In this case, the processing capacity of the dewatered cake 14 is adjusted according to the water content of the coagulated sludge 13. On the other hand, in the dehydrator 29, the treated water generated with the generation of the dewatered cake 14 is:
Wastewater treatment device 41 by transport pump 39 and transport pipe 40
, Where the organic matter is separated and collected, and the clean water is returned to the river by the discharge pipe 42 and the discharge pump 43.

The granules 15 generated by the dehydrator 29 are conveyed by a conveyor 38 and charged into a rotating drum 46 of the granulating device 30 by a charging device 49. In the granulating device 30, the dewatering cake 14 is added to the water absorbing agent adding device 5.
At 0, the water absorbing agent 44 is added, and at the same time, the solidifying agent 45 is added by the solidifying agent adding device 51. By rotating the rotating drum 46 and rotating the stirring blade 47 in the opposite direction, the dewatered cake 14, the water-absorbing agent 44, and the solidifying agent 45 are mixed by the scraper 48, so that the internal substance is separated and granulated. Then, the granular material 15 is formed. Granular body 15
Is formed, the granular material 15 is discharged from the rotating drum 46 to the carry-out conveyor 52, carried out by the carry-out conveyor 52, and at the most downstream position of the carry-out conveyor 52, the granular material 15 is The deodorant 16 is sprayed to deodorize. Then, after curing for a predetermined period in this state,
Quality equivalent to sand or good quality soil can be secured.

The granulating treatment in the granulating device 30 will be described in detail. The reaction between the water absorbing agent 44 and the solidifying agent 45 causes the fine particles in the dewatered cake 14 to bind together and absorb water to form a gel. The granular material 15 can be generated by dividing and granulating the substance inside. That is, when the cement H is added to the dewatering cake 14, the pH of the water in the water absorbing agent 14 fluctuates.
Numeral 4 forms a silicic acid polymer between the fine particles in the dewatering cake 14 to restrain the fine particles and to take in free water in the dewatering cake 14 to gel. Thereby, dehydration cake 1
The viscosity of No. 4 increases, and dispersion granulation becomes possible. In addition, the solidifying agent 45 has hydraulic property, is mixed inside the granular material 15, reacts with moisture taken in the inside, and forms a hydrate in several hours to several days to be stable. Solidify.
The fine particles in the dehydrated cake 14 are hardened while being restrained by the water-absorbing agent 14 and are thus increased in particle size.
In No. 5, the fine particle component is reduced.

The granular material 15 thus formed has strength and safety because it is produced by using an inorganic material, and is re-equivalent to high quality soil such as backfill material or embankment material as a construction material. It can be used, and the cost of disposal can be reduced. In this case, since the construction material composed of the granular material 15 is lightweight and has good water permeability, it is most suitable as a playground, a soil for planting trees, and an embankment for a lands.
It can also be used as drainage material for landfills.
Further, by using water glass and cement as the particle-forming agent as the water-absorbing agent 44 and the solidifying agent 45, the processing cost is reduced and the processing operation is facilitated.

That is, the safety can be ensured by using an apparatus using both water glass, which is a safe inorganic material, and an inorganic hydraulic material such as cement. In addition, by absorbing water with water glass, it is possible to increase the viscosity required for dispersion granulation even for mud with a relatively high water content, and to restrict the fine particles to increase the particle size. Of fine particles can be reduced. Furthermore, the processes such as drying and dehydration, which conventionally required cost and time in the process, are not required, and the granulation can be performed at low cost and with high efficiency, and the apparatus can be simplified and the cost can be reduced.

On the ground side, the coagulation tank 28, the dehydrator 29, the transport conveyor 38, the charging device 49, the granulating device 3
0. Since the carry-out conveyor 52 is of a closed type, it does not come into contact with the atmosphere and odor does not leak outside. Furthermore, the dewatering treatment of the bottom mud 11 was performed in three steps, namely, the concentration tank 23, the coagulation tank 28, and the dehydrator 29.
Each device can be reduced in size and weight.

Incidentally, by measuring the weight and the water content of the bottom mud 11 in each processing step with a weigh scale or a moisture meter, it is possible to control the operating conditions of each processing step.

[Second Embodiment] FIG. 2 shows a schematic configuration of a bottom mud treatment apparatus according to a second embodiment of the present invention. Note that members having the same functions as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted.

In the apparatus for treating bottom mud according to the present embodiment, in addition to the apparatus for treating bottom mud according to the above-described embodiment, it is possible to exhaust odor in each processing step.

That is, as shown in FIG.
3. Coagulation tank 28, dehydrator 29 (conveyor 3
8), granulating device 30 (inputting machine 49), unloading conveyor 5
2 is a closed type. Then, the branch pipes 62 to 66 of the exhaust pipe 61 are connected to each device, an exhaust pump 67 is attached to the exhaust pipe 61, and an odor filter (activated carbon filter) 69 is attached to the return air port 68 of the exhaust pipe 61. It is.

Therefore, the concentration tank 23 and the coagulation tank 2
8. When the bottom mud 11 is being processed by the dehydrator 29, the granulating device 30, and the unloading conveyor 52, the odor generated in each processing step is reduced by operating the exhaust pump 67.
6 and exhausted through the exhaust pipe 61, and the odor filter 69
The odor is removed by passing through, and the surrounding environment is not deteriorated.

[0034]

As described above in detail in the embodiment, according to the apparatus for treating bottom mud according to the first aspect of the present invention, the bottom mud suction means for moving the bottom mud treated water area to suck the bottom mud, A thickening tank that generates concentrated sludge by storing bottom sludge and adding a flocculant; a flocculating tank that generates flocculated sludge by storing concentrated sludge and adding and stirring a flocculant; A dehydrating means for dehydrating to produce a dehydrated cake;
A granulation means for forming a granular material by adding a water absorbing agent and a solidifying agent to the dehydrated cake and stirring and mixing to separate and granulate the internal substance is provided. It can be reused as high quality soil, and the cost of waste disposal can be reduced, and the processing process from suction of bottom mud to dewatering to granulation is formed as one system Thus, the apparatus can be simplified and the cost can be reduced.

Further, according to the apparatus for treating bottom mud according to the second aspect of the present invention, the deodorant spraying means for spraying the deodorant on the granular material generated by the granulating means is provided, so that it is simple. The odor of the granular material formed by the configuration can be removed.

Further, according to the apparatus for treating bottom mud according to the third aspect of the present invention, since each processing is performed with the concentration tank, the coagulation tank, the dewatering means, and the granulation means closed, the bottom mud is exposed to the atmosphere. The odor does not leak to the outside without touching, and the deterioration of the surrounding environment can be prevented.

According to the apparatus for treating bottom mud according to the fourth aspect of the present invention, since the exhaust pipe and the exhaust pump are connected to the concentration tank, the coagulation tank, the dewatering means, and the granulating means, the odor during the processing of the bottom mud is reduced. It is possible to prevent the surrounding environment from deteriorating due to no leakage to the outside.

According to the apparatus for treating bottom mud according to the fifth aspect of the present invention, since the odor filter is attached to the return port of the exhaust pipe, the odor during the processing of bottom mud is eliminated by the odor filter. External leakage of the odor is eliminated, and the deterioration of the surrounding environment can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus for treating bottom mud according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a bottom mud processing apparatus according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a conventional method for treating bottom mud in a river or the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Bottom mud 12 Condensed sludge 13 Condensed sludge 14 Dehydration cake 15 Granular material 16 Deodorant 21 Dredge pipe (Bottom mud suction means) 22 Suction pump 23 Concentration tank 24 Coagulant 28 Coagulation tank 29 Dehydrator (Dehydration means) 30 Granulation Device 33 Coagulant 41 Wastewater treatment device 44 Water absorbing agent 45 Solidifying agent 53 Deodorant spray device 61 Exhaust pipe 67 Exhaust pump 69 Odor filter

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidesada Kinji 1-14-16 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Hanshin Expressway Public Corporation Osaka Construction Bureau Organization (72) Inventor Natsuyo Sato Chuo, Kobe, Hyogo Prefecture 1-3-3 Higashi-Kawasaki-cho, Hanshin Expressway Public Corporation Kobe Second Construction Department Organization (72) Inventor Isao Ishida 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Pref. Inventor Osamu Yoshizumi 1-1-1 Wadazakicho, Hyogo-ku, Kobe City, Hyogo Prefecture Inside Mitsubishi Heavy Industries, Ltd.Kobe Shipyards Inside the Takasago Research Laboratory (72) Inventor Hiroyuki Katayama 2-1-1, Shinhama, Arai-machi, Takasago-shi, Hyogo F-term in the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. Remarks) 4D059 AA09 BE10 BE16 BE31 BE54 BG00 BJ01 BK03 BK09 CA16 CB01 CB04 CB09 CB18 CB23 CC04 DA04 DA06 DA14 DA24 DA61 DA65 DA66 DB11 EA01 EA02

Claims (5)

[Claims] 1. A bottom mud suction means for moving in a bottom mud treatment water area to suction bottom mud, a thickening tank for storing the sucked bottom mud and adding a flocculant to produce a thickened sludge, A flocculation tank that generates the flocculated sludge by storing the concentrated sludge transported from the concentration tank, adding a flocculant, and stirring, and dewatering the flocculated sludge transported from the flocculation tank to generate a dewatered cake A dewatering means, and a granulating means for forming a granular body by dividing the internal substance into particles by adding and mixing a water absorbing agent and a solidifying agent to the dewatered cake generated by the dewatering means and mixing. A bottom mud treatment device comprising: 2. The bottom mud treatment apparatus according to claim 1, further comprising a deodorant spraying means for spraying a deodorant on the granular material generated by said granulating means. Mud treatment equipment. 3. The apparatus for treating bottom mud according to claim 1, wherein said concentration tank, said coagulation tank, said dehydrating means,
An apparatus for treating bottom sediment, wherein each treatment is performed with the granulating means closed. 4. The apparatus for treating bottom mud according to claim 3, wherein the concentration tank, the coagulation tank, the dewatering means,
An apparatus for treating bottom sediment, wherein an exhaust pipe and an exhaust pump are connected to the granulating means. 5. An apparatus for treating bottom mud according to claim 4, wherein an odor filter is attached to a return port of said exhaust pipe.