Sludge treatment facility and sludge treatment method

Abstract

To provide a sludge treatment facility and a sludge treatment method.SOLUTION: There is provided a sludge treatment facility for dehydrating purified water sludge X that has been poured into a storage tank 10, the facility including: a protective layer 11 laid on a bottom surface of the storage tank 10; a water collection branch pipe 12 buried in the protective layer 11 and collecting water filtered and separated by the protective layer 11; and a vacuum pump 2 functioning as a negative pressure generating device that exhausts gas from the water collection branch pipe 12 and applies a negative pressure to the protective layer 11. The vacuum pump 2 is connected to a discharge port 14 through which water collected in the water collection branch pipe 12 is discharged outside the storage tank 10 using a spacer joint.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sludge treatment facility and a sludge treatment method for dehydrating purified water sludge. [Background technology]

[0002] At water purification plants, purified water sludge with a high water content is generated during the purification process of water taken from rivers. The purified water sludge is sent to a sun drying bed where it is dehydrated to reduce the water content to the specified level before being transported. Dehydration using a sun drying bed uses natural processes to dehydrate and dry the purified water sludge, evaporating the water with solar heat and wind. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-54800 Summary of the Invention [Problem to be solved by the invention]

[0004] However, dehydration treatment using a sun drying bed requires a long dehydration treatment period, which requires a large site, and the dehydration effect is greatly affected by the season and weather.

[0005] Other possible dehydration processes include well points, filter presses, belt presses, screw decanters, centrifugal dehydrators, etc. (See, for example, Patent Document 1.) All of these dehydration processes require large-scale, complex equipment.

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a sludge treatment facility and a sludge treatment method that can solve the above-mentioned problems and shorten the dehydration treatment period of purified water sludge treated in a sun drying bed. [Means for solving the problem]

[0007] The sludge treatment facility of the present invention is a sludge treatment facility that dehydrates purified water sludge that has been put into a storage tank, and is equipped with a protective layer laid on the bottom surface of the storage tank, a water collection pipe that is buried in the protective layer and collects water that has been filtered and separated by the protective layer, and a negative pressure generating device that exhausts gas from the water collection pipe and applies negative pressure to the protective layer. Furthermore, in the sludge treatment facility of the present invention, the negative pressure generating device is connected to a discharge outlet that discharges the water collected in the water collection pipe out of the storage tank using a spacer joint. The sludge treatment facility of the present invention according to claim 1, further comprising an impermeable membrane on the surface of the purified water sludge introduced into the storage tank. The sludge treatment facility of the present invention is further characterized in that it comprises a filter for preventing clogging, which is laid between the protective layer and the purified water sludge. In addition, the sludge treatment method of the present invention is a sludge treatment method for dehydrating purified water sludge using a sun-drying bed equipped with a storage tank with a protective layer laid on the bottom, in which the purified water sludge is poured into the storage tank and negative pressure is applied to the protective layer by a negative pressure generating device. [Effects of the Invention]

[0008] According to the present invention, the dehydration treatment period of purified water sludge treated in a sun drying bed can be shortened, and the sun drying bed can be effectively used in a short cycle period. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view showing an embodiment of a sludge treatment facility. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] FIG. 1 is a cross-sectional view illustrating the installation of a filter and an impermeable membrane. DETAILED DESCRIPTION OF THE INVENTION

[0010] Next, a mode for carrying out the present invention (hereinafter simply referred to as an "embodiment") will be specifically described with reference to the drawings.

[0011] 1 and 2, the sludge treatment facility of this embodiment includes a sun drying bed 1 and a vacuum pump 2. The sun drying bed 1 filters and separates water from the introduced purified water sludge X having a high water content, and dehydrates and dries the sludge by solar radiation or the like.

[0012] The sun drying bed 1 comprises a sloped, flat storage tank 10 and a protective layer 11 laid on the floor plate of the storage tank 10. The protective layer 11 is a permeable layer made of a sand layer, crushed stone layer, or the like, and filters and separates water from the purified water sludge X poured into the top.

[0013] A plurality of water collection branch pipes 12 are arranged at approximately equal intervals and in parallel on the floor plate of the storage tank 10 and are embedded in the protective layer 11. The water collection branch pipes 12 are made of perforated pipes such as corrugated perforated pipes or perforated PVC pipes, and collect the water that has been filtered and separated by the protective layer 11.

[0014] The water collection branch pipe 12 has a gentle slope, and its lower end is connected to a water collection pipe 13 arranged along the wall of the storage tank 10. The water collection pipe 13 is made of a non-perforated pipe such as a corrugated non-perforated pipe. The water collection pipe 13 has an outlet 14 formed therein that penetrates the wall of the storage tank 10 and opens into a water collection trench 15 arranged adjacent to the storage tank 10. Water collected in the water collection branch pipe 12 is collected in the water collection pipe 13 due to the gentle slope, and is discharged from the outlet 14.

[0015] A suction hose 21 connected to a vacuum pump 2 is connected to the discharge outlet 14. The connection between the discharge outlet 14 and the suction hose 21 is preferably made using a spacer joint, which allows for one-touch detachment. In the example shown in Figure 1, a vacuum pump 2 is connected to each of the three discharge outlets 14, but the number of discharge outlets 14 and the number of vacuum pumps 2 are set appropriately depending on the capacity of the solar drying bed 1, etc.

[0016] When the vacuum pump 2 is operated, it discharges gas from the water collection pipe 13 and the branch water collection pipe 12 through the outlet 14. When the gas is discharged from the water collection pipe 13 and the branch water collection pipe 12, the protective layer 11 is put into a negative pressure state through the holes in the branch water collection pipe 12. In other words, the vacuum pump 2 functions as a negative pressure generator that applies negative pressure to the protective layer 11. When the vacuum pump 2 is operated, the protective layer 11 is put into a negative pressure state, which promotes the discharge (filtration and separation) of water contained in the purified water sludge X. This enables early dehydration treatment and allows the solar drying bed 1 to be used effectively in a short cycle period.

[0017] Using a sun drying bed 1 at a water purification plant, a comparative test was conducted to compare the dehydration effects of conventional sun drying and operating a vacuum pump 2. As a result, it took about 6 to 8 months to reduce the water purification sludge X to the specified moisture content using conventional sun drying, but by operating vacuum pump 2, the dehydration period could be shortened by about 2 months.

[0018] By operating the vacuum pump 2, there is a high risk that fine particles of the purified water sludge X will penetrate into the protective layer 11 and cause clogging. Therefore, it is preferable to install a filter 16 to prevent clogging at the boundary between the upper surface of the protective layer 11 and the purified water sludge X. The filter 16 is made of nonwoven fabric or the like, and is made of a material such as a filter material, and is made of a material such as a filter material. F15 / D S15 >5, D F15 / D S85 If it is less than 5, the filtering function of the protective layer 11 can be maintained.

[0019] In the sludge treatment facility of this embodiment, the surface of the purified water sludge X is in an open state, so that dehydration may be further promoted by using various dehydration methods such as well points in combination.

[0020] The dewatering effect of the vacuum pump 2 can be improved by laying an impermeable membrane 17 on the surface of the purified water sludge X to increase airtightness. The impermeable membrane 17 can be a thin, easy-to-handle sheet material such as vinyl chloride resin, polyvinyl chloride (PVC), or polyolefin resin. The impermeable membrane 17 may also be laid by spraying a chemical. The laying of the impermeable membrane 17 is particularly effective in winter, when sun drying cannot be expected. In addition, airtightness can be improved by sealing the areas where the water collection pipe 13 passes through the wall of the storage tank 10 to prevent air leakage.

[0021] As described above, this embodiment is a sludge treatment facility that performs dehydration treatment on purified water sludge X that has been introduced into a storage tank 10, and includes a protective layer 11 laid on the bottom surface of the storage tank 10, a water collection branch pipe 12 that is buried in the protective layer 11 and collects water that has been filtered and separated by the protective layer 11, and a vacuum pump 2 that functions as a negative pressure generating device that exhausts gas from the water collection branch pipe 12 and applies negative pressure to the protective layer 11. This configuration promotes the discharge (filtration and separation) of water contained in the purified water sludge X fed into the sun drying bed. As a result, the dehydration treatment period for the purified water sludge X treated in the sun drying bed 1 can be shortened, and the sun drying bed 1 can be used effectively in a short cycle period.

[0022] Furthermore, in this embodiment, the vacuum pump 2 is connected to an outlet 14 that discharges the water collected in the water collection branch pipe 12 to the outside of the storage tank 10 using a spacer joint. With this configuration, the vacuum pump 2 can be attached and detached with a single touch. For example, by making the drainage equipment such as the vacuum pump 2 vehicle-mounted, it can be transported and diverted anywhere, anytime.

[0023] Furthermore, in this embodiment, an impermeable membrane 17 is provided on the surface of the purified water sludge X introduced into the storage tank 10. This configuration increases airtightness and further improves dewatering efficiency.

[0024] Furthermore, in this embodiment, a filter 16 is provided between the protective layer 11 and the purified water sludge X to prevent clogging. This configuration can prevent the protective layer 11 from clogging.

[0025] The present invention has been described above based on the embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in terms of the combination of the respective components, and that such modifications are also within the scope of the present invention. [Explanation of symbols]

[0026] 1 Solar drying bed 2. Vacuum pump 10 storage tank 11 Protective layer 12 Water collection branch pipe 13 Water collection pipe 14 Outlet 15 Water collection ditch 16 filters 17 Impermeable membrane 21 Suction hose X Water purification sludge

Claims

1. A sludge treatment facility that performs dehydration treatment on purified water sludge that has been put into a storage tank, A protective layer laid on the bottom surface of the storage tank; a water collection pipe that is buried in the protective layer and collects water that has been filtered and separated by the protective layer; a negative pressure generating device that discharges gas from the water collection pipe and applies negative pressure to the protective layer.

2. The sludge treatment facility according to claim 1, characterized in that the negative pressure generating device is connected to an outlet that discharges water collected in the water collection pipe outside the storage tank using a spacer joint.

3. 2. The sludge treatment facility according to claim 1, wherein an impermeable membrane is provided on the surface of the purified water sludge introduced into the storage tank.

4. 2. The sludge treatment facility according to claim 1, further comprising a filter for preventing clogging, which is disposed between the protective layer and the purified water sludge.

5. A sludge treatment method for dehydrating purified water sludge using a sun drying bed equipped with a storage tank having a protective layer laid on the bottom, comprising: The purified water sludge is poured into the storage tank; A sludge treatment method, characterized in that a negative pressure is applied to the protective layer by a negative pressure generating device.

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