JPH10118698A - Dam sludge and sand discharging facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make no need of transferring dredged matters by dump trucks as in a conventional method, prevent malodor evolution from organic matters, and at the same time make a stockyard for sludge unnecessary regarding a dam sludge and sand discharging facility where mixed deposited matters of sludge of such as leaves getting rotten in the bottom of water in a dam and earth and sand are separated and treated. SOLUTION: From sludge-like deposited matters 6 taken out of the bottom of water in a dam by an underwater working machine 2 equipped with bucket wheels, gravel with large particle size is separated by a cyclone 43 equipped with a pressurized water injection means 44 of a bottom matter separating apparatus 7 in a first treatment means, earth and sand are turned back to the bottom of the water in the dam, the remaining slurry-like mixture containing organic matters is separated into inorganic matters 21 such as finely granular sand, etc., and organic matters 20 by a cyclone 24 equipped with an air blowing means 25 of a second treatment means, and the inorganic matters 27 are also turned back to the bottom of the water in the dam and the organic matters 28 are decomposed by a treatment means 30 for the organic matters.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to sludge formed by the fallen leaves and broken branches from trees on the shore settling and corroding on the water bottom of dams, and the sediment flowing down from the upstream of rivers and dammed by dam dam bodies. The present invention relates to a dam sludge discharge facility for treating a sludge-like sediment generated by mixing. In addition, the present invention
It is applied not only to dams but also to closed water areas such as lakes and harbors.

[0002]

2. Description of the Related Art As a conventional dam sludge discharge system, the following means have been implemented. (1) At locations with extremely low water levels, excavate and take in sludge, earth and sand, etc. with earth-moving equipment such as a hydraulic shovel, load this into a dump truck, transport it to the disposal site, and dispose of it. (2) In places with high water levels, float tug boats and other vessels, mount a rotary grab type earth-moving machine on them, take in the earth and sand with the rotary grabs, transport them to the shore, then dump trucks on land And transport it to the disposal site. (3) As shown in FIG. 2, float the dredging work boat 101,
The work spud 115 or the auxiliary spud 114 is driven into the lake bottom, and the anchor 102 is driven into the anchor boom 107 to be fixed. On the other hand, the arm 116 is operated by the winches 108 and 109 mounted on the dredging work boat 101, and the arm 116 is operated.
The bottom mud layer 106 is dredged by the swivel table 104 and the mud collector 105 attached to the tip of the tank, and is taken in by the mud suction pump 103. The dredged material thus taken in is transported by the conveying pipe 117 attached to the arm 116 and the dust removing device 11.
It is stored in the mud storage tank 111 via 0. The dredged material in the mud storage tank 111 is given fluidity by a stirrer 118, and is conveyed to a disposal site 113 by a mud feed pump 119 through a water mud pipe 112 to be disposed of.

[0003]

However, the above-mentioned prior art has the following technical problems. (1) Dump trucks transport sludge and sand, causing problems such as noise pollution and traffic congestion for local residents, and increase running costs. (2) It is difficult to secure a stockyard for sludge-like sediments excavated and taken in. (3) At the disposal site, excavated sediments contain organic matter and become industrial waste, which increases the cost of disposal and raises pollution problems such as foul odors.

[0004]

Means for Solving the Problems To solve the above-mentioned problems, a dam sludge discharge facility of the present invention is provided with sediment taking-in means for taking in sludge-like sediment on the water bottom of a dam, and sediment taking-in means. First processing means for separating a slurry-like mixture of fine-grained sediment and organic matter from the sediment by means of a sediment separating apparatus and returning the remaining large-grained sediment to the water area of the dam; A second treatment means for dewatering the slurry-like mixture by a dewatering / separation device in the vicinity of the dam to separate the inorganic matter and the organic matter and returning the inorganic matter to the water area of the dam, and an organic matter for guiding the organic matter separated by the means to decompose the organic matter A sediment separation cyclone having a treatment means, wherein the sludge sediment is introduced and sediment separation is performed, and pressurized water is injected into the cyclone to promote the sediment separation. Pressurized water A centrifugal separator configured to dewater the slurry-like mixture, and a cyclone for inorganic / organic separation configured to separate the mixture dewatered by the centrifuge into an inorganic substance and an organic substance. And air blowing means for blowing air into the cyclone to promote inorganic / organic separation.

In the above-described dam sludge discharge facility of the present invention, the sludge-like sediment taken in from the bottom of the dam by an underwater working machine or the like is converted into a slurry of fine-grained sediment and organic matter by a sediment separation device in the first treatment means. The sediment mixture is separated and the remaining large sediment is returned to the dam bottom. Then, the slurry-like mixture is separated into inorganic matter and organic matter by the dewatering / separating device in the second treatment means, and the separated inorganic matter is returned to the dam water area, so that only organic matter remains, but the organic matter is immediately treated with organic matter. Decomposed by means.

[0006] Therefore, the process of transporting the dredged material to the processing site by the dump truck as in the related art is not required, and the stock yard for the dredged material is not required, so that significant cost reduction is expected. In addition, since the respective processes in the first and second processing means and the organic substance processing means are performed in a closed loop, the water quality improvement processing is efficiently performed, and the emission of the offensive odor of the organic substances is prevented.

In particular, in this facility, the sediment separation device in the first treatment means is configured as a cyclone provided with a pressurized water injection means, so that a mixture of fine-grained sediment having a particle size of 74 μm or less and organic matter is separated. Efficiency is achieved by the cyclone principle and the stirring action and the generation of bubbles by the injection of pressurized water.

In this equipment, the dewatering / separating device in the second processing means has a dehydrating action by a centrifugal separator and an action of separating the dewatered mixture into inorganic and organic substances by a cyclone with air blowing means. The organic matter thus obtained can be sent to the organic matter treatment means in a closed loop.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given, with reference to the drawings, of a dam sludge discharge facility according to an embodiment of the present invention. FIG. 1 is a system diagram of the same, and a traveling underwater work machine 2 having a bucket wheel and the like. The sludge-like sediment on the water bottom of the dam 1 is taken in by the excavation-type taking-in means 7.

[0010] The sludge-like sediment 6 composed of the earth and sand and the organic matter and water taken into the underwater working machine 2 in this manner,
Immediately in the sediment separation apparatus 7 comprising the cyclone 43 and the pressurized water injection means 44 in the first treatment means, the fine-grained sediment (particle size 74 μm or less) and the slurry-like mixture 12 of organic matter and water are separated, and the remaining particle size Large sediment and minerals are pumped together with water to maintain their fluidity
It is plumbed so that it is returned to the water bottom inside the 45.

The finely divided earth and sand and the slurry mixture 12 of organic matter and water separated by the first treatment means are
The dewatering / separation 15 is performed by the dewatering centrifuge 20 in the dewatering / separating device 22 of the second processing means, and the water is stored in a water storage 37. The remaining inorganic / organic mixture is dewatered and separated
Inorganic matter in cyclone 24 with air blowing means 25 in 22
27 and organic matter 28.

The organic matter 28 thus separated is subjected to a biotechnology fermentation / decomposition apparatus 30 as means for treating organic matter.
To be decomposed. And the remaining inorganic matter 27
Is to be returned to the dam waters.

Further, the operation of recovering the function of the dam 1 and purifying the water quality by the dam sludge discharge facility of the present embodiment will be described in detail as follows. (1) The sludge 42 composed of sludge and sand is fluidized 3 by the underwater working machine 2 with a bucket wheel as a vehicle that is mobile and easy to transport, and is excavated / taken (dredged) 4
To carry out the slurry transport 5 together with the water.

(2) The taken-in sludge 42 is a cyclone 43
Separation into coarse-grained sediment 10, coarse-grained sediment 11, fine-grained sediment having a particle size of 74 μm or less, and fine particles 12 of sludge by a sediment separation device 7 utilizing the principle of cavitation and flotation by the pressurized water 44 , 9, coarse grain sand
10 and coarse sediment 11 are deposited on the bottom of the dam and transported to the next stage for the treatment of fine particles 12. Until this treatment, it is basically performed under the water 13 of the dam 1.

(3) The fine particles 12 containing water are subjected to high-speed coagulation 17, the overflow water 18 is stored in a water treatment means 35, and the remaining water is stored in a sludge tank 19.
The water 21 is sent to the water treatment means 35, the other sludge is sent to the cyclone 24, and the dewatering / separation 15 is performed by a system using the principle of the cyclone 24, the air blowing of the air blowing means 25 and the principle of gravity difference. Water, water 26 means water treatment
The mixture is transported to 35 and is separated 29 into inorganic substances 27 and organic substances 28.

(4) The separated inorganic matter 27 is coarse-grained soil 1
Return to the bottom of the dam 3 to perform the same processing as 0, 11
Deposit by 2 and possibly recycle 33. Organic matter 28 is decomposed by bio or chemical treatment
30 or 31 recycling. (5) The water removed from the sand and sludge at each stage of the facility is treated with
To the reservoir 37.

(6) The coarse-grained sediment 10, the coarse-grained sediment 11, and the fine-grained sediment 27 deposited on the dam bottom are subjected to hydraulic suction conveyance 34 by a pump to be deposited in front of the dam dam 45. Do 38. (7) The mineral soil deposited 38 in front of the dam 45 of dam 1
The water is conveyed after the dam weir body 45 by a siphon pipe or a pump utilizing the difference between the water level of the dam 1 and the river water level, for example, temporarily deposited 40, and sand is discharged and discharged to the downstream river 41.

In the embodiment of the present invention, based on the above (1) to (7), the dam sludge 42 itself is separated into organic matter and inorganic matter in a closed loop without being raised on land around the dam 1,
Inorganic soil is treated by organic matter and sand is released to the downstream of the dam.

In the above-described dam sludge discharge facility of the present embodiment, the sludge-like sediment taken in by the taking-in means such as an underwater working machine is used to separate the large-sized sediment by the sediment separation device 7 in the first treatment means. The sediment is separated and immediately returned to the bottom of the water. On the other hand, the remaining slurry mixture after the separation is dewatered in the vicinity of the dam, and then separated by a dewatering / separating device 22 in the second processing means to separate inorganic matter including fine-grained sediment. The inorganic substances are also returned to the bottom of the dam, leaving only organic substances.
Decomposed at 30.

Therefore, the process of transporting the dredged material to the processing site by the dump truck as in the prior art is not required, and the sediment separating device 7 in the first processing means, the dewatering / separating device 22 in the second processing means, and the organic matter processing. Since each processing by the fermentation decomposition apparatus 30 as a means is performed in a closed loop,
The treatment for improving the water quality is efficiently performed, and the emission of the offensive odor of the organic matter is prevented.

In particular, in the present facility, the sediment separation device 7 in the first treatment means is configured as a cyclone 43 provided with a pressurized water injection means 44, so that a mixture of fine-grained sediment having a particle size of 74 μm or less and organic matter is separated. Is efficiently performed by the cyclone principle and the stirring action by the injection of pressurized water and the generation of bubbles.

Further, in the present equipment, the dewatering / separating device 22 in the second processing means causes the dewatering action of the centrifugal separator 20 and the dewatered mixture to be converted into inorganic matter 27 and organic matter 28 by the cyclone 24 with the air blowing means 25. The separation operation can be properly performed, and the organic substance 28 thus obtained can be sent to the organic substance processing means 30 in a closed loop.

[0023]

As described above, according to the dam sludge discharge facility of the present invention, the following effects can be obtained. (1) Sludge-like sediment taken in from the bottom of the dam
In addition to the sediment having a large particle diameter being separated by the processing means, the same sand is immediately returned to the water bottom, and the remaining slurry mixture is also separated into fine-grained sediment by the second processing means and returned to the water bottom, The remaining organic matter is decomposed by the organic matter treatment means, so that the process of transporting the dredged material to the treatment site with a dump truck as in the past is not required, and the dredged material stock yard is not required, resulting in significant cost reduction. Is expected. Moreover, since the first and second treatment means and the organic matter treatment means are performed in a closed loop, the treatment for improving the water quality is efficiently performed, and the emission of offensive odor of the organic matter is prevented. (2) Since the sediment separation device in the first treatment means is configured as a cyclone provided with a pressurized water injection means,
Separation of the mixture of fine-grained earth and sand having a particle size of 74 μm or less and organic matter can be efficiently performed by the cyclone principle, the stirring action by pressurized water injection and the generation of bubbles. (3) The dewatering / separating device in the second processing means appropriately performs the dewatering action of the centrifugal separator and the action of separating the dewatered mixture into inorganic substances and organic substances by a cyclone with air blowing means. Thus, the organic substance thus obtained can be sent to the organic substance processing means in a closed loop.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a dam sludge discharge facility as one embodiment of the present invention.

FIG. 2 is a side view showing a dredging work boat as an example of a conventional dam sludge treatment means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dam 2 Underwater working machine 3 Bottom soil fluidization means 4 Sludge sandy dredging 5 Dredged material conveyance means 6 Sludge 7 Bottom sedimentation equipment 8, 9 Separation means 10 Coarse-sized grain sand 11 Coarse-sized soil 12 Slurry mixture 15 Dewatering separation Means 16 Fine particles 17 High-speed sedimentation means 18 Water 19 Sludge tank 20 Centrifuge 21 Water 22 Dewatering / separation equipment 23 Sludge 24 Cyclone 25 Air blowing means 26 Water 27 Inorganic matter 28 Organic matter 29 Separation means 30 Organic matter treatment means 31 Recycling means 32 Return Means 33 Recycling means 34 Hydraulic suction / conveyance means 35 Water treatment means 36 Treated water 37 Reservoir 38 Sedimentation means 39 Transportation means 40 Temporary sedimentation 41 Downstream 42 Sludge 43 Cyclone 44 Pressurized water injection means 45 Dam dam

Claims (1)

[Claims] 1. A sediment taking-in means for taking in sludge-like sediment on the water bottom of a dam, and a sediment separating device separates a slurry-like mixture of fine-grained soil and organic matter from the sediment taken in by the means. A first treatment means for returning the remaining large-sized earth and sand to the water area of the dam, and a dewatering / separating device for separating the slurry-like mixture separated by the means in the vicinity of the dam to separate inorganic and organic substances. A second treatment means for returning inorganic matter to the water area of the dam; and an organic matter treatment means for decomposing and treating the organic matter separated by the means,
The sediment separation device is constituted by a sediment separation cyclone in which the sludge-like sediment is introduced to perform sediment separation, and pressurized water injection means for injecting pressurized water into the cyclone to promote the sediment separation. The dewatering / separating apparatus includes a centrifugal separator for dewatering the slurry mixture, a cyclone for inorganic / organic separation for separating the mixture dewatered by the centrifugal separator into an inorganic substance and an organic substance, A sludge discharge facility for dams, comprising air blowing means for blowing air into the air to promote inorganic / organic separation.