JP2607779B2 - Sludge solidification method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge solidification treatment method and a sludge solidification treatment device provided on a work boat for sludge solidification treatment.

[0002]

2. Description of the Related Art Conventionally, a method of dredging and removing sludge (organic and inorganic fine precipitates) deposited on the seabed, rivers and lakes by a grab is disclosed in, for example, Japanese Patent Publication No. 58-54216.
No. 6,086,045. This is because the sludge accumulation area is partitioned by a steel cut-off wall, and after discharging the surface water in the section, the water glass-based chemical and the acid neutralizing agent are injected into the sludge layer in this section and mixed. Thereby, after the entire sludge layer in the section is gelled at the original position to form a jelly shape in which fluidity has disappeared, dredging is performed by grab.

[0003]

Generally, in the case of a river, the surface water flowing on the surface of the riverbed at the bottom penetrates into the riverbed and the embankment, and is carried away along with the sediment at the bottom of the riverbed and the embankment. It has been found to be eroded and weakened, causing levee and other landslides during floods. In particular, where the damage from the surface water of the riverbed is enlarged after the sludge layer is removed, it is necessary to rehabilitate the river by laying concrete floorboards or casting concrete to solve this problem. there were.

[0004] In the conventional sludge solidification and dredging operations, when the sludge is gelled, if an acidic neutralizing agent is injected and stirred, the sulfur contained in the sludge is converted into malodorous substances (hydrogen sulfide, methyl sulfide). Mercaptan, etc.), and are released into the atmosphere together with the substances originally contained in the sludge, causing odor pollution around the dredging work site,
There was a problem that dredging work was not possible except during winter. In addition, it is extremely difficult to work in deep water, for example, at a depth of 2 m or more, and it is difficult to manufacture and construct a large waterproof block. Further, there is a problem that noise is generated when the water stop frame is set or when the club basket is worked.

The present invention solves the above-mentioned problems and, at the same time as dredging sludge, can also carry out river repair work that can prevent flood damage due to riverbed surface water. An object of the present invention is to provide a sludge solidification treatment method and apparatus capable of extremely reducing the emission of substances and improving the dredging work site and its surrounding environment.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the first means of the sludge solidification treatment method according to the present invention is to gel a sludge deposited on a river and to dredge the sludge on a riverbed below the sludge layer. Is to inject cement milk to form a cement layer on the riverbed surface.

The second means of the sludge solidification treatment method is as follows:
From the workboat moored at a predetermined position, the diffusion prevention cover body with the open bottom is lowered and immersed in the sludge layer, and the stirring blades are rotated in the diffusion prevention cover body to agitate the sludge layer and the liquid chemical for solidification treatment. After the sludge layer is gelled to form a gel with no fluidity, the stirring blades are lowered to the riverbed and stirred, and simultaneously, cement milk is injected to form a cement layer on the riverbed surface, or stirring. At the same time as stirring the blades on the riverbed, injecting cement milk to form a cement layer on the riverbed surface, then rotating the stirring blades inside the diffusion prevention cover to stir the sludge layer and inject the liquid for solidification treatment into the sludge. The layer is gelled to form a jelly with no fluidity, and the stirring blade is raised and moved in the horizontal direction. Business gelled sludge diffusion preventive cover body Repeat to move the work barge by pulling diffusion barrier cover and stirring blades, and performs subsequent processing operations.

Further, the sludge solidification treatment device is provided with a diffusion prevention cover having only a bottom surface opened on a workboat via an elevating device so as to be immersed in water, and the sludge layer is stirred and mixed in the diffusion prevention cover. A possible stirring blade is rotatably provided in a freely movable manner in the vertical and horizontal directions, a rotation driving device for the stirring blade is provided, and a stirring blade elevating device for moving the stirring blade up and down from the inside of the diffusion preventing cover and the stirring blade are diffused. A stirring blade moving device for horizontally moving inside the prevention cover body is provided, and the stirring blade is provided with a chemical liquid injection nozzle for injecting a solidification treatment liquid into the sludge layer and a cement milk injection nozzle for injecting cement milk.

[0009]

According to the first means of the sludge solidification method, cement milk is poured onto the riverbed below the sludge layer to form a cement layer on the surface of the riverbed at the same time as the sludge solidification operation. Damage due to riverbed surface water can be prevented without any rehabilitation work, it is extremely efficient, and the work cost can be greatly reduced as compared with the separate rehabilitation work.

According to the second means of the sludge solidification treatment method and the sludge solidification treatment apparatus, in addition to the effect of the first means, a diffusion preventing cover is used and a stirring and solidification treatment liquid is used therein. Since the injection is performed, generation of gas and emission of offensive odor can be prevented, and generation of noise can be reduced. In addition, since the diffusion prevention cover body can be immersed in water for processing work, a large depth of sludge solidification can be performed by increasing the lifting stroke of the diffusion prevention cover body, and the diffusion prevention cover body can be submerged in water. Since the agitating blades can be buried and the stirring blades can be moved in the horizontal direction, the size of the diffusion prevention cover can be increased, a wide range of sludge can be treated, and the treatment capacity can be greatly increased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sludge solidification processing apparatus according to the present invention will be described below with reference to the drawings.

The overall configuration will be described with reference to FIGS. 1 to 3, reference numeral 1 denotes a processing work boat equipped with a sludge solidification processing apparatus.
A diffusion prevention cover body 3 supported so as to be able to ascend and descend via a cover body elevating device 2 and a movable carriage 4 which is supported so as to be able to ascend and descend through a stirring blade elevating device 5 and is inserted and arranged in the diffusion prevention cover body 3. The apparatus includes a stirring blade 6, a cement milk tank 7 having a cement supply device, and a chemical solution tank 8 having a chemical solution supply device and storing a chemical solution for sludge solidification treatment which gels the sludge to form a jelly-like fluidity. ing.

In FIG. 4, reference numeral 11 denotes a dredging work boat, which comprises a dredging conveyor device 12 for scraping gelled sludge onto the dredging work boat 11, and a dehydrator 13 for dewatering the gelled sludge. The dewatered sludge is loaded onto a carrier 14 such as earth and sand via a conveyor device, and dredging and removal are performed.

Next, the details will be described. As shown in FIGS. 7 and 8, the anti-diffusion cover 3 is in the shape of a horizontally long rectangular box, the lower surface of which is open, and two hanging rods 21 of the cover elevating device 2 are attached to and detached from both left and right ends. It is freely connected and supported. At the center of the top plate 22 of the diffusion prevention cover 3, a blade insertion opening 23 for inserting the stirring blade 6 is formed, and the blade insertion opening 2 is formed.
3 are provided with four slide lids 24 for opening and closing
The slide lid 24 is a diffusion prevention cover 3 for the stirring blade 6.
After insertion into the inside, the blade insertion opening 23 is closed and fixed by fixing means such as bolts. At the center of the top plate 22, a moving slit 25 into which the rotating shaft 6a of the stirring blade 6 is movably fitted extends from the blade insertion opening 23 along the length direction of the diffusion prevention cover body 3. Is formed.

As shown in FIG. 3, the cover lifting device 2 is attached to a lifting device support 26 erected on the left and right sides of the processing work boat 1 for the navigation of the processing work boat 1. The cover body elevating frame 28 can be turned upside down via the horizontal shaft 27.
Are supported, and as shown by phantom lines during navigation, the cover body lifting frame 2 is
8 can be stored by tilting it horizontally. As shown in FIGS. 7 and 8, the cover body elevating frame 28 is provided with a cover body elevating cylinder device 30 which is arranged so as to be able to expand and contract from the upper part to the lower part. An elevating body 36 is attached to a pair of elevating chains 35 wound around a pair of fixed sprockets 31 and 32 provided at the lower end and a pair of movable sprockets 33 and 34 attached to the tip of the piston rod.
Are connected to each other to form a double speed mechanism in which the elevating body 36 moves up and down 2 × La with respect to the stroke La of the cover body elevating cylinder apparatus 30. The upper end of the suspension rod 21 is supported by the elevating body 36.

As shown in FIGS. 3 and 9, the movable carriage 4 is provided with a movable roller 42 and a guide roller 43 on a movable rail 41 laid between the lifting device supports 26 on the processing work platform 1. And a moving device 48 for driving a moving chain 46 wound around moving sprockets 44, 45 at both ends by a moving motor 47. Both ends of the moving chain 46 move. It is connected to the carriage 4 and moved. As shown in FIG. 10, a support bracket 49 is provided on the front surface of the movable trolley 4, and a mounting bracket 51 provided on a lower rear portion of the stirring blade elevating frame 50 is provided with a horizontal support pin 52 on the support bracket 49. It is rotatably connected and supported through the intermediary. The piston rod of the cylinder device 53 for raising and lowering whose base end portion is swingably supported by the movable carriage 4 is connected to the agitating blade elevating frame 50, and the horizontal storage position during navigation and the vertical usage position during use. Tilted between.

As shown in FIGS. 10 and 11, the stirring blade elevating device 5 has a stirring blade elevating frame device 50 and a stirring blade elevating cylinder device 54 which is arranged to extend and contract from the upper part to the lower part. A pair of fixed sprockets 55 and 56 provided at the upper end and lower end of the stirring blade elevating frame 50 and a pair of movable sprockets 57 and 58 attached to the tip of the piston rod. The lifting member 60 is connected to the lifting chain 59.
Are connected to each other to form a double speed mechanism in which the elevating body 36 moves up and down by 2 × Lb with respect to the stroke Lb of the stirring blade elevating cylinder device 54.

Then, as shown in FIG.
0, a stirring blade rotation driving device 61 with a speed reducer is provided, the upper end of the rotating shaft 6a is supported, and a lower portion of the stirring blade rotation driving device 61 is used to supply a solidification treatment liquid to the sludge layer. A chemical liquid supply device 64 for supplying a chemical liquid for solidification treatment to the chemical liquid injection pipes 62 and 63 in the rotary shaft 6a is provided. The chemical solution supply device 64 includes a supply hole 6 in which the chemical solution injection pipes 62 and 63 are connected to a shaft 65 of the rotating shaft 6a.
6 and 67 are formed and opened on the outer peripheral surface, and the supply hole 6 is formed in the inner surface of the cylindrical portion 68 rotatably fitted to the shaft portion 65.
6 and 67 are respectively formed in the annular connection grooves 69 and 70, and the communication holes 6 in the annular connection grooves 69 and 70 are formed.
9a and 70a are provided with a chemical supply pipe 7 from a chemical tank 8.
1, 72 are connected. Sludge layer A and riverbed C
The cement milk injection pipe 65 arranged at the axis of the rotating shaft 6a to supply the cement milk during
5 is connected to a rotary joint 74 at the upper end of the rotating shaft 6a through a supply hole 73, and a cement milk supply pipe 75 from the cement milk tank 7 is connected to the rotary joint 74.

The chemical solution for solidification comprises a water glass-based chemical (eg, sodium silicate or potassium silicate solution) and an acidic neutralizing agent (eg, sulfuric acid, hydrochloric acid, carbonic acid, organic acid, etc.)
Water glass-based chemicals are strongly alkaline, but when an acid is added to PH = 7, silicic acid (SiO ₂ ) is polymerized, and when the concentration of SiO ₂ is high (2% or more), water is also solidified. When the concentration of SiO ₂ is low (0.5% to 2%), it gels and exhibits a jelly-like shape. Therefore, if the water glass-based chemical is mixed into the sludge and neutralized, the whole sludge becomes jelly-like, which is convenient for dredging. In addition, water glass has a property of exchanging sodium ions and metal ions M ⁺ contained in each of them, and it is well known that water glasses bind heavy metals. Furthermore, water glass is inorganic and does not deteriorate the water quality because its gel point is PH = 7. Further, since it is a liquid instead of a solid (powder) such as cement or lime, it is sludge. Is relatively easy to mix.

As shown in FIG. 12, the stirring blade 6 has a stirring member 81 attached to the lower end of the rotating shaft 6a, and a straight plate-shaped wing body 83 having a plurality of stirring chips 82 at the bottom side. It is fixed to the rotating shaft 6a in the horizontal direction orthogonal to the direction at a certain interval in the direction. The chemical injection pipes 62 and 63 are connected to, for example, chemical supply nozzles 84 and 85 formed on the stirring blade 6, respectively.
The cement milk injection pipe 65 is, for example, a cement milk injection nozzle 8 provided on the rotating shaft 6a near the stirring member 81.
6 is connected. The chemical solution supply nozzles 84 and 85
The cement milk injection nozzle 86 can be provided at any position on the rotating shaft 6a or the stirring blade 6 according to the condition of the sludge at the site.

Next, a method for solidifying sludge using the solidifying apparatus will be described. (1) The processing work boat 1 is made to travel to the processing site to prepare for the work. First, the raising / lowering frame 28 in a horizontal state is raised by extending the tilting cylinder device 29,
At the lower end of the suspension rod 21, the diffusion prevention cover body 3 held by the processing work boat 1 is attached. Next, the tilting cylinder device 53 is extended to raise the horizontal stirring blade elevating frame 50, and the stirring blade 6 is inserted into the diffusion prevention cover body 3 from the opened blade insertion opening 23 and slides. The lid 24 is closed and fixed.

(2) After the processing workboat 1 is stopped at a predetermined position and positioned, the cover body elevating cylinder device 30 and the stirring blade elevating cylinder device 54 are simultaneously contracted, and are moved via the elevating body 36 and the suspension rod 21. As a result, the agitation blade 6 is lowered through the elevating member 60 and the rotating shaft 6a, and the diffusion prevention cover 3 is submerged. As shown by a virtual line in FIG. Penetrate the top of A.

(3) Activate the stirring blade rotation driving device 61 to rotate the stirring blade 6 in the diffusion preventing cover 3 to stir the sludge layer A and to disperse the water glass based chemical from the chemical solution injection nozzle 84 into the sludge layer. A, and then a chemical solution injection nozzle 8
From step 5, an acidic neutralizing agent is injected into the sludge layer A to gel the sludge B and to form a jelly-like non-fluid.

(4) The stirring blade raising / lowering cylinder device 54 is further contracted to lower the stirring blade 6 and stop on the riverbed C. Then, the cement milk is injected from the cement milk injection nozzle 86, and the stirring blade 6 is rotated and mixed by stirring to form a cement layer D on the surface of the riverbed C.

(5) The agitating blade elevating cylinder device 54 is extended to raise the agitating blade 6 into the diffusion preventing cover 3, and then the moving carriage 4 is moved by the moving device 48 to move the rotating shaft 6a to the moving slit. 25 to move the stirring blade 6 horizontally to the next work position.

(6) The above-mentioned operations (3) to (5) are repeated to complete the solidification processing in the diffusion preventing cover 3, and the processing work boat 1 is moved to the next work position. The gelled sludge B that has been solidified in this manner is removed by the dredging work boat 11 shown in FIG.

That is, the dredging work boat 11 is stopped, and the dredging conveyor device 12 is lowered to position the lower end on the surface of the concrete layer D. Then, the dredging conveyor device 12 is activated to convey the gelled sludge B onto the dredging work boat 11, and the dredging work boat 11 is sequentially advanced to perform dredging continuously. The gelled sludge C swept up by the dredging work boat 11 is dehydrated by the dehydrator 13 and then discharged by the carrier 14.

According to the above embodiment, the diffusion preventing cover 3
Is configured to be submerged and penetrate into the upper part of the sludge layer A,
Moreover, the stirring blade 6 is supported by the stirring blade lifting / lowering device 5 of the processing work boat 11 through the rotating shaft 6a through the moving slit 25 of the top plate 22 and is driven to rotate, so that the diffusion prevention cover 3 is enlarged. It is possible to greatly expand the working range at one time as compared with the related art. In addition, a large rotational driving force and a large moving force of the stirring blade 6 can be obtained, and a large depth sludge treatment operation can be performed by increasing the up-and-down stroke of the diffusion prevention cover 3 and the stirring blade 6.

Further, by injecting the cement milk onto the riverbed C, the cement layer D can be formed on the surface of the riverbed C, thereby preventing damage to the revetment due to the surface water flow of the riverbed.
It is possible to prevent erosion of the seawater on the riverbed which may be caused by sludge removal. In addition, cement milk is alkaline, and may affect particularly the function of the acid neutralizer of the solidification treatment liquid. However, when cement milk is injected, after the sludge is gelled in the diffusion preventing cover 3, Since it descends and is injected into the lower part of the gelled sludge B, it is possible to minimize the influence of the cement milk on the liquid medicine for solidification treatment.

In the above embodiment, the sludge is gelled first and then the segment milk is injected, but the segment milk may be injected and the sludge gelled later.

[0031]

As described above, according to the present invention, a cement layer is formed on the riverbed surface by injecting cement milk between the riverbed and the sludge layer at the same time as the sludge solidification treatment operation. Damage due to riverbed surface water can be prevented without rehabilitation work, it is extremely efficient, and operation costs can be significantly reduced compared to separately rehabilitation work.

Further, by using the diffusion prevention cover body and injecting the chemical solution for agitation and solidification treatment therein, generation of gas and emission of offensive odor can be prevented, and generation of noise can be reduced. Furthermore, since the diffusion prevention cover body can be immersed in water and used for processing fraud, a large lifting stroke of the diffusion prevention cover body enables sludge solidification processing at a large depth, and the stirring blades can be moved horizontally. Since it can be moved, the size of the diffusion prevention cover can be increased, and a wide range of sludge can be easily processed, so that the processing capacity can be greatly increased.

[Brief description of the drawings]

FIG. 1 is an overall front view of a solidification processing apparatus according to the present invention.

FIG. 2 is an overall side sectional view of the solidification processing apparatus.

FIG. 3 is a schematic front view of the solidification processing apparatus.

FIG. 4 is an overall side view showing the dredging work boat.

FIG. 5 is a plan view of the diffusion prevention cover.

FIG. 6 is a front sectional view of the diffusion prevention cover body.

FIG. 7 is a side view of the cover body elevating device.

FIG. 8 is a schematic front sectional view of the cover body elevating device.

FIG. 9 is a side sectional view of the movable cart.

FIG. 10 is a schematic side sectional view of the stirring blade elevating device.

FIG. 11 is a schematic front view of the stirring blade elevating device.

FIG. 12 is a partially cutaway front view of the stirring blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing workboat 2 Cover body elevating device 3 Diffusion prevention cover body 4 Moving carriage 5 Stirrer blade elevating device 6 Stirrer blade 6a Rotating shaft 7 Cement milk tank 8 Chemical tank 11 Dredging workboat 21 Suspension rod 23 Blade insertion opening 25 Slit for moving 28 Cover frame elevating frame 30 Cover body elevating cylinder device 41 Moving rail 48 Moving device 50 Stirrer blade elevating frame 54 Stirrer blade elevating cylinder device 61 Stirrer blade rotating drive 84 Chemical liquid injection nozzle 85 Chemical liquid injection nozzle 86 Cement milk injection Nozzle A Sludge layer B Gel sludge layer C Riverbed D Concrete layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masakazu Kashiwara 5-3-28 Nishikujo, Konohana-ku, Osaka-shi, Osaka Hitachi Zosen Corporation (72) Inventor Yoshihiro Utsu 5-chome, Nishikujo, Konohana-ku, Osaka-shi, Osaka No. 28 No. 28 within Hitachi Zosen Corporation (56) References JP-A-53-98133 (JP, A) JP-A-4-161300 (JP, A) JP-B-52-18486 (JP, B2)

Claims (3)

(57) [Claims] 1. A method for solidifying sludge, comprising: upon gelling and dredging sludge deposited on a river, injecting cement milk into a riverbed below the sludge layer to form a cement layer on the surface of the riverbed. 2. A diffusion prevention cover having an open bottom is lowered from a workboat moored at a predetermined position to sink into the sludge layer, and a stirring blade is rotated in the diffusion prevention cover to agitate the sludge layer. At the same time, the solidification treatment liquid is injected to gel the sludge layer into a jelly-like non-fluid, then the stirring blades are lowered to the riverbed and stirred, and at the same time, cement milk is injected to form a cement layer on the riverbed surface Or, after stirring the stirring blades on the riverbed and simultaneously injecting cement milk to form a cement layer on the riverbed surface, rotate the stirring blades inside the diffusion prevention cover to stir the sludge layer and solidify the chemical solution. , The sludge layer is gelled to form a jelly with no fluidity, the stirring blades are raised and moved in the horizontal direction, and the above-mentioned stirring, injection of the liquid for solidification treatment, lowering, stirring, cement A sludge solidification method comprising repeating the operation of injecting milk to gel the sludge in the diffusion prevention cover, raising the diffusion prevention cover and the stirring blades, moving the work boat, and performing the next processing operation. 3. A workbench boat is provided with an anti-diffusion cover body, which is open only at the bottom, through a lifting device so as to be immersed in water.
A stirring blade capable of stirring and mixing the sludge layer is rotatably provided in the diffusion preventing cover body in the vertical and horizontal directions, and a rotation driving device for the stirring blade is provided. A stirring blade elevating device for moving and a stirring blade moving device for horizontally moving the stirring blade in the diffusion prevention cover are provided, and a chemical liquid injection nozzle for injecting a solidification treatment liquid into the sludge layer and a cement for injecting cement milk into the stirring blade. A sludge solidification treatment device comprising a milk injection nozzle.