Solid-liquid separation, dewatering and drying apparatus for wastewater

Abstract

To provide an apparatus capable of continuously pouring wastewater containing an organic solid even after a sun-drying bed is full of water, and capable of performing solid-liquid separation, dewatering, and drying of a large volume of wastewater containing organic solids in a sun-drying bed in a single treatment.SOLUTION: A solid-liquid separation, dewatering and drying apparatus for wastewater includes a main bed and an auxiliary bed adjacent to the main bed, in which some or all of tank walls separating the main bed and the auxiliary bed have a first overflow weir that is lower than the other tank walls of the main bed, some or all of tank walls of the auxiliary bed located opposite the first overflow weir have a second overflow weir that is lower than the other tank walls of the auxiliary bed, the bottoms of the main bed and the auxiliary bed have a culvert drainage pipe communicating from the main bed to the outside of the auxiliary bed, and a filtration material is laid in the tank in both the main bed and the auxiliary bed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus for solid-liquid separation, dehydration and drying of wastewater, which performs solid-liquid separation, dehydration (de-salting), drying and the like on wastewater containing organic solids. [Background technology]

[0002] 2. Description of the Related Art Conventionally, solar drying beds have been known for performing solid-liquid separation, dehydration, and drying of organic solids with a high moisture content, such as sewage sludge. A solar drying bed is a method in which wastewater containing organic solids with a high moisture content is poured into a sand layer set up in a tank surrounded by concrete walls, etc., and the organic solids are separated from the water by the filtering function of the sand layer, dehydrating the organic solids, and then dried by sunlight, etc. This is a useful means of obtaining dried organic solids without using chemicals and with little burden on energy and human labor. In addition, since solar drying beds are easy to use for desalination at the dehydration and drying stages, a series of processes can be carried out in accordance with the method of desalination by washing with fresh water, as outlined in the Ministry of Agriculture, Forestry and Fisheries' desalination manual.

[0003] However, while the solid matter concentration of typical sewage sludge is around 20,000 mg / L, the solid matter concentration of fish feces, leftover feed, etc. contained in the breeding water discharged from breeding tanks at aquaculture facilities (hereinafter referred to as "aquaculture solids") is approximately 150 mg / L, which means that aquaculture solids have an extremely low concentration compared to sewage sludge. Therefore, if the cultured solids are to be subjected to solid-liquid separation using a solar drying bed, a larger planar area must be secured compared to the case of sewage sludge solids. For example, Boxman et al. (2018) conducted an experiment in which they dried aquaculture solids over 211 days and recovered 34 kg. The solar drying bed used had a floor area of ​​12 m × 1.6 m (19.2 m). 2 ) was.

[0004] The amount of culture solids that could be dried and recovered was small given the area, and the time it took to recover it was long. This is because wastewater containing the culture solids is poured into the solar drying bed until it is full, but the pouring must be stopped before it overflows. In addition, the poured wastewater is filtered through a sand layer and discharged through an underdrain drainage pipeline, and the remaining culture solids are naturally dehydrated and dried by sunlight and wind, and only the dried culture solids are extracted. All of these processes are carried out using a single solar drying bed, and this process is repeated.

[0005] One possible way to improve this is to make the weir top of part of the tank wall into which wastewater containing organic solids is poured lower than the other tank walls, and provide an overflow weir to allow the wastewater to overflow.

[0006] For example, Patent Document 1 discloses a sludge filtering device that can effectively permeate a chemical agent into sludge when the chemical agent is added to the sludge poured into a gravity filtration section. According to an example embodiment of the sludge filtration device (Figure 7 of Patent Document 1), when the water level of the chemical G exceeds the height of the overflow weir 11, the chemical G overflows the overflow weir 11 and drips down from the chemical addition section 8, and is distributed widely in the width direction of the overflow weir 11, so that the chemical G can be added over a wide area of ​​the sludge S. Similarly, if an overflow weir that allows wastewater to overflow can be used, water can be continued to be poured into the solar drying bed even when the bed is full, even if the organic solids contained in the wastewater are aquaculture solids, and a large amount of dried aquaculture solids can be obtained in one treatment.

[0007] However, even if an overflow weir is used, in the end, wastewater containing organic solids can only be treated within the scope of the planar area of ​​the solar drying bed where solid-liquid separation, dehydration, and drying are carried out. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2018-158322 A Summary of the Invention [Problem to be solved by the invention]

[0009] Therefore, the present invention has been made in consideration of the above-mentioned problems, and has an object to provide a sun drying bed which allows the pouring of wastewater containing organic solids to continue even after the sun drying bed is full, and which can perform solid-liquid separation, dehydration, and drying of a large amount of wastewater containing organic solids in a single treatment. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides the following technical solutions.

[0011] The wastewater solid-liquid separation, dehydration and drying apparatus according to the present invention comprises: It consists of a main floor consisting of a tank surrounded by walls on all four sides. At the bottom of the bed, a culvert drainage pipe is installed that runs to the outside of the bed. In the tank of this bed, filtration material is laid out. It is characterized by having a combination of one or more of the following means: 1) One or more plate-shaped auxiliary weirs, lower than the tank wall, are installed on this bed, close to the tank wall downstream of the wastewater being poured in, and approximately parallel to the tank wall. 2) The auxiliary dam is formed with a through hole. 3) One or more of the tank walls of this bed are lined with filtration material on the inner wall side. 4) The above-mentioned culvert drainage pipe is provided with an on-off valve at its outlet outside the bed.

[0012] The wastewater solid-liquid separation, dehydration and drying apparatus according to the present invention comprises: It is composed of a main bed and an auxiliary bed, which is adjacent to the main bed and is a tank surrounded by walls on all four sides. A part or all of the tank wall separating the main bed from the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that connects the main bed to the outside of the auxiliary bed. In a configuration in which a filter material is laid in the tank of the main bed and the auxiliary bed, or in the tank of the main bed, It is characterized by having a combination of one or more of the following means: 1) Part or all of the tank wall other than the first overflow weir of the auxiliary bed consists of a second overflow weir which is lower than the other tank walls of the auxiliary bed. 2) The main bed and / or auxiliary bed are provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are approximately parallel to the tank wall, close to the tank wall downstream of the wastewater being poured in. 3) The auxiliary dam is formed with a through hole. 4) Filter material is laid on the inner wall side of one or more tank walls of the main bed including the first overflow weir and the auxiliary bed including the second overflow weir. 5) The above-mentioned culvert drainage pipe is provided with an on-off valve at the outlet outside the main bed or auxiliary bed.

[0013] The wastewater solid-liquid separation, dehydration and drying apparatus according to the present invention comprises: A first main floor and a second main floor each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first and second main beds and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed, Underdrain drainage pipes are installed at the bottom of the first main bed, the second main bed and the auxiliary bed, which run from the first main bed and the second main bed to the outside of the auxiliary beds. In a configuration in which a filter medium is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed, It is characterized by having a combination of one or more of the following means: 1) Part or all of the tank wall other than the first overflow weir of the auxiliary bed consists of a second overflow weir which is lower than the other tank walls of the auxiliary bed. 2) At least one of the first main bed, second main bed, and auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are approximately parallel to the tank wall, close to the tank wall downstream of the wastewater being poured in. 3) The auxiliary dam has a through hole formed therein. 4) Filter material is laid on the inner wall side of one or more tank walls of the first main bed including the first overflow weir, the second main bed including the second overflow weir, and the auxiliary bed. 5) The above-mentioned culvert drainage pipe is provided with an opening / closing valve at the outlet outside the main bed (including the first main bed and the second main bed) or outside the auxiliary bed. Effect of the Invention

[0014] 1) The device of the present invention has the advantage that the amount of wastewater that can be poured into the bed for one treatment is several times larger than the volume of the bed, and as a result, it is able to treat larger volumes of wastewater than conventional solar drying beds. Normally, when wastewater containing organic solids is poured into a sun-drying bed, the organic solids accumulate on the surface of the sand layer in the sun-drying bed, inhibiting the filtering function of the sand layer, which separates the organic solids from the water, and gradually decreasing it. However, even if water is continued to be poured in, the organic solids, which have a high specific gravity, continue to accumulate on the surface of the sand layer before the wastewater overflows from the bed. Therefore, by allowing the organic solids to settle and wastewater containing a small proportion of organic solids to actively overflow from the bed, it becomes possible to inject a large amount of wastewater into the bed. The device of the present invention filters the wastewater that overflows from the main bed in the auxiliary bed, so that even if wastewater containing organic solids overflows from the main bed, it can be properly filtered. 2) In addition, in the device of the present invention, the auxiliary weir restricts the accumulation of organic solids on the surface of the sand layer between the auxiliary weir and the tank wall before the wastewater overflows from the main bed, so that the wastewater containing a small proportion of organic solids that flows over the organic solids accumulated on the surface of the sand layer can be filtered by the sand layer between the auxiliary weir and the tank wall. 3) Furthermore, in the device of the present invention, the filter material in the tank wall flows over the organic solids deposited on the surface of the sand layer before the wastewater overflows from the bed, and the wastewater containing a small proportion of organic solids can be filtered through the tank wall. [Brief description of the drawings]

[0015] [Figure 1] A schematic diagram showing the cross-sectional structure of the device, which is composed of a main bed and an auxiliary bed, with the downstream tank wall being an overflow weir. [Diagram 2] A schematic diagram showing the cross-sectional structure of an apparatus having an auxiliary weir adjacent to the downstream tank wall. [Diagram 3] A schematic diagram showing the cross-sectional structure of a device with an auxiliary weir adjacent to a downstream overflow weir. [Figure 4] FIG. 1 is a schematic diagram showing an example of an auxiliary dam having a through hole. [Diagram 5] FIG. 13 is a schematic diagram showing another embodiment of an auxiliary dam having a through hole. [Figure 6] A schematic diagram showing an example of a tank wall made of an overflow weir with a filter material laid on the inner wall side. [Figure 7] FIG. 1 is a schematic diagram showing an example of a tank wall having a filter material laid on the inner wall side. [Figure 8] FIG. 1 is a schematic diagram showing an embodiment in which two sets of a first main bed, a second main bed, and an auxiliary bed are provided in parallel. [Figure 9] FIG. 9 is a diagram showing an implementation plan for operating the embodiment of FIG. 8. [Figure 10] Illustration showing a partial crack in the layer of organic solids deposited on the surface of the sand layer, causing wastewater to short-circuit and flow out of the underdrain pipe. [Figure 11] An illustration showing the state in which the on-off valve installed at the outlet of the underdrain drain pipe is closed and fresh water is poured into the tank into which the wastewater is poured (after the salt is dissolved from the layer of organic solids, the underdrain drain pipe valve is opened to discharge the water and remove the salt). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] <First Example> The first embodiment of the wastewater solid-liquid separation, dehydration and drying apparatus according to the present invention is as follows: In a structure consisting of only a main bed consisting of a tank surrounded by walls on all four sides, At the bottom of the bed, a culvert drainage pipe is installed that runs to the outside of the bed. The inside of the tank is lined with filtration material. Furthermore, the present invention is configured to include a combination of one or more of the following means: 1) One or more plate-shaped auxiliary weirs, lower than the tank wall, are installed on this bed, close to the tank wall downstream of the wastewater being poured in, and approximately parallel to the tank wall. 2) The auxiliary dam is formed with a through hole. 3) One or more of the tank walls of this bed are lined with filtration material on the inner wall side. 4) The above-mentioned culvert drainage pipe is provided with an on-off valve at its outlet outside the bed.

[0017] <Second Example> The second embodiment of the wastewater solid-liquid separation, dehydration and drying apparatus according to the present invention is as follows: It is composed of a main bed and an auxiliary bed, which is adjacent to the main bed and is a tank surrounded by walls on all four sides. A part or all of the tank wall separating the main bed from the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that connects the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. Furthermore, the present invention is configured to include a combination of one or more of the following means: 1) Part or all of the tank wall other than the first overflow weir of the auxiliary bed consists of a second overflow weir which is lower than the other tank walls of the auxiliary bed. 2) The main bed and / or auxiliary bed are provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are approximately parallel to the tank wall, close to the tank wall downstream of the wastewater being poured in. 3) The auxiliary dam is formed with a through hole. 4) Filter material is laid on the inner wall side of one or more tank walls of the main bed including the first overflow weir and the auxiliary bed including the second overflow weir. 5) The above-mentioned culvert drainage pipe is provided with an on-off valve at the outlet outside the main bed or auxiliary bed.

[0018] <Third Example> The third embodiment of the wastewater solid-liquid separation, dehydration and drying apparatus according to the present invention is as follows: A first main floor and a second main floor each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first and second main beds and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed, Underdrain drainage pipes are installed at the bottom of the first main bed, the second main bed and the auxiliary bed, which run from the first main bed and the second main bed to the outside of the auxiliary beds. Filter media is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed. Furthermore, the present invention is configured to include a combination of one or more of the following means: 1) Part or all of the tank wall other than the first overflow weir of the auxiliary bed consists of a second overflow weir which is lower than the other tank walls of the auxiliary bed. 2) At least one of the first main bed, second main bed, and auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are approximately parallel to the tank wall, close to the tank wall downstream of the wastewater being poured in. 3) The auxiliary dam has a through hole formed therein. 4) Filter material is laid on the inner wall side of one or more tank walls of the first main bed including the first overflow weir, the second main bed including the second overflow weir, and the auxiliary bed. 5) The above-mentioned culvert drainage pipe is provided with an opening / closing valve at the outlet outside the main bed (including the first main bed and the second main bed) or outside the auxiliary bed.

[0019] Of the wastewater solid-liquid separation, dehydration and drying apparatuses consisting of the above-mentioned embodiments, the second and third embodiments are provided with the first overflow weir as shown in Figure 1 so that even if wastewater containing organic solids overflows from the main bed, solid-liquid separation, dehydration and drying can be performed in the auxiliary bed, thereby enabling water to continue being poured into the main bed.

[0020] After being poured into the main bed, the wastewater containing organic solids gradually settles within the tank of the main bed. However, since the solids concentration of aquaculture solids is extremely low compared to that of sewage sludge, the wastewater containing organic solids that overflows the first overflow weir and is poured into the auxiliary bed (hereinafter referred to as "overflow water") contains almost no organic solids. Therefore, in order to increase the amount of organic solids that are separated into solids and liquids, dehydrated, and dried in the main bed, it is effective to allow the wastewater containing the organic solids to overflow from the main bed into the auxiliary bed.

[0021] In addition, like the second overflow weir in Figure 1, a second overflow weir can be provided to allow further overflow from the auxiliary bed.

[0022] Regardless of which overflow weir is used, when wastewater injection is stopped, organic solids accumulate on the surface of the sand layer, and a large amount of water (supernatant water) remains on top of it for a long period of time without being filtered, and it may take a considerable amount of time for it to be filtered. In other words, the organic solids that accumulate on the surface of the sand layer prevent the supernatant water from filtering, which causes the drying period to be extended.

[0023] Therefore, in the present embodiments (1st to 3rd), as shown in Figures 2 and 3, one or more auxiliary weirs are provided inside the tank of the main bed and / or auxiliary bed near the first overflow weir and / or the second overflow weir. The auxiliary weir has a lower crest than the overflow weir. When wastewater containing organic solids is poured into the tank of this bed, the organic solids are blocked by the auxiliary weir inside the tank before it overflows the first and / or second overflow weir, and the wastewater that overflows the auxiliary weir and contains almost no organic solids is filtered by the sand layer with no organic solids accumulated on its surface. As a result, processing efficiency can be significantly improved. Furthermore, when multiple auxiliary weirs are installed, the weir tops can be gradually lowered from the overflow weir toward the inside of the tank, allowing wastewater containing almost no organic solids to be efficiently filtered by the sand layer.

[0024] Furthermore, the auxiliary dam can be formed with through holes as shown in FIGS. As shown in Figures 2 and 3, the wastewater containing almost no organic solids that passes over the auxiliary weir is filtered by the sand layer with no organic solids deposited on its surface and the gravel layer below it. As a result, the wastewater moves horizontally through the perforations and is filtered by a wide area of ​​the sand layer and the gravel layer below it. The position and size of the through-holes can be changed at positions corresponding to the sand layer and the gravel layer thereunder, as shown in Figs.

[0025] In the present embodiment (first to third), as shown in Figs. 6 and 7, the tank walls of the main bed and / or auxiliary bed are covered with a filter medium. By covering the tank walls with filtration material, the supernatant water that would otherwise be stored for a long period of time unfiltered due to organic solids accumulated on the surface of the sand layer can be filtered through the tank walls, improving the filtration function.

[0026] The method for covering the tank wall with the filtering material can be, for example, to cover the surface of the tank wall with a lattice-like wire mesh or the like and then to cover it with gravel or sand. In addition, the filtration material on the tank wall can be normally covered with a partition plate or the like, and the partition plate can be removed only when filtering the supernatant water. The filter material may be laid on only one of the main bed and the auxiliary bed, or may be laid on only some of the tank walls rather than on all of the tank walls.

[0027] The filter material, including the tank walls and inside the tank, can be materials commonly used as filter materials, such as gravel or sand, and for example, the bottom layer can be a gravel layer and the top layer can be a sand layer. In order to prevent organic solids from accumulating on the surface of the sand layer, which would reduce the filtration function, the filter material in the tank can be stacked in a stepped manner on top of the sand layer, inside the tank further inside the downstream tank wall (including the first overflow weir and / or the second overflow weir).

[0028] In this embodiment (third), as shown in Figure 8, the first main bed and the second main bed, which share the same auxiliary bed, are alternately used, making it possible to continuously pour water into the tank without stopping the pouring of wastewater. In other words, by starting to pour wastewater into the first main bed, and waiting for a while after the wastewater overflows into the auxiliary bed, pouring of wastewater into the second main bed can be started, allowing treatment to continue without stopping the pouring.

[0029] In the third embodiment, when two sets of the first main bed, second main bed and auxiliary bed are used side by side as shown in FIG. 8, the operation is as shown in FIG. 9.

[0030] After the wastewater containing a certain amount of organic solids has been injected, it is filtered through gravel and sand layers and discharged through an underdrain drainage pipe, just like in conventional solar drying beds, to separate the solids and liquids. After natural dehydration and drying by sunlight and wind, the organic solids are extracted.

[0031] The wastewater solid-liquid separation, dehydration and drying device of this embodiment can remove salts from organic solids by injecting fresh water in accordance with the vertical permeation method or leaching method in the salt removal manual of the Ministry of Agriculture, Forestry and Fisheries, and washing away chloride ions (Cl-) and sodium ions (Na+) that are components of seawater.

[0032] Furthermore, the wastewater solid-liquid separation, dewatering and drying apparatus of the present invention makes it possible to implement the vertical seepage method by providing an on-off valve at the outlet of the underdrain drainage pipe outside the main bed (including the first main bed and the second main bed) or outside the auxiliary bed, as shown in Figure 11.

[0033] In conventional solar drying beds, when desalination of organic solids is performed, the precipitated organic solids form a layer on the entire surface of the sand layer, which allows effective desalination by the vertical infiltration method. However, if the layer of organic solids is only partially formed, or if the layer shrinks as the dehydration and drying progresses and cracks form in the organic solids layer, as shown in Figure 10, the injected fresh water will short-circuit and flow out from the outlet of the underdrain drain pipe, and sufficient desalination cannot be expected.

[0034] Therefore, as shown in Figure 11, a method can be adopted in which an on-off valve that can temporarily stop the discharge is provided at the outlet of the underdrain drain pipe, fresh water is filled into a tank into which the wastewater is poured, and the salt is dissolved from the layer of organic solids. Then, after that, the valve of the underdrain drain pipe is opened to discharge the water, thereby removing the salt. When the organic solids layer is spread over the entire surface of the sand layer, after the supernatant water on top of the organic solids layer has disappeared and solid-liquid separation has been carried out, fresh water can be poured onto the top of the organic solids layer and salt removal can be carried out by the vertical infiltration method.

Claims

1. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

2. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

3. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, On the main bed and / or the auxiliary bed, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

4. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, On the main bed and / or the auxiliary bed, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; The auxiliary dam has a through hole formed therein, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

5. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, On the main bed and / or the auxiliary bed, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

6. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, On the main bed and / or the auxiliary bed, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; The auxiliary dam has a through hole formed therein, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

7. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. Filter material is laid on the inner wall side of one or more tank walls of the main bed and auxiliary bed, including the first overflow weir. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

8. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. At least one of the tank walls of the main bed including the first overflow weir and the auxiliary bed including the second overflow weir is covered with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

9. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, On the main bed and / or the auxiliary bed, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. Filter material is laid on the inner wall side of one or more tank walls of the main bed and auxiliary bed, including the first overflow weir. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

10. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, On the main bed and / or the auxiliary bed, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; The auxiliary dam has a through hole formed therein, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. Filter material is laid on the inner wall side of one or more tank walls of the main bed and auxiliary bed, including the first overflow weir. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

11. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, On the main bed and / or the auxiliary bed, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. At least one of the tank walls of the main bed including the first overflow weir and the auxiliary bed including the second overflow weir is covered with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

12. The main floor is a tank surrounded by walls on all four sides. An auxiliary bed adjacent to the main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or all of the tank wall separating the main bed and the auxiliary bed is made of a first overflow weir that is lower than the other tank walls of the main bed, A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, On the main bed and / or the auxiliary bed, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; The auxiliary dam has a through hole formed therein, At the bottom of the main bed and auxiliary bed, a culvert drainage pipe is installed that runs from the main bed to the outside of the auxiliary bed. Filter material is laid in the tank between the main bed and the auxiliary bed, or in the tank of the main bed. At least one of the tank walls of the main bed including the first overflow weir and the auxiliary bed including the second overflow weir is covered with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

13. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. Filter media is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

14. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed, A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. Filter media is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

15. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; At least one of the first main bed, the second main bed, and the auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are substantially parallel to the tank wall, in the vicinity of the tank wall on the downstream side of the wastewater to be poured in, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. Filter media is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

16. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; At least one of the first main bed, the second main bed, and the auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are substantially parallel to the tank wall, in the vicinity of the tank wall on the downstream side of the wastewater to be poured in, The auxiliary dam has a through hole formed therein, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. Filter media is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

17. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, At least one of the first main bed, the second main bed, and the auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are substantially parallel to the tank wall, in the vicinity of the tank wall on the downstream side of the wastewater to be poured in, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. Filter media is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

18. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, At least one of the first main bed, the second main bed, and the auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are substantially parallel to the tank wall, in the vicinity of the tank wall on the downstream side of the wastewater to be poured in, The auxiliary dam has a through hole formed therein, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. Filter media is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

19. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. A filter medium is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed; At least one of the tank walls of the first main bed, the second main bed and the auxiliary bed, including the first overflow weir, is covered with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

20. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. A filter medium is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed; The first main bed including the first overflow weir, the second main bed including the second overflow weir, and one or more of the auxiliary bed walls are covered with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

21. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; At least one of the first main bed, the second main bed, and the auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are substantially parallel to the tank wall, in the vicinity of the tank wall on the downstream side of the wastewater to be poured in, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. A filter medium is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed; At least one of the tank walls of the first main bed, the second main bed and the auxiliary bed, including the first overflow weir, is covered with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

22. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; At least one of the first main bed, the second main bed, and the auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are substantially parallel to the tank wall, in the vicinity of the tank wall on the downstream side of the wastewater to be poured in, The auxiliary dam has a through hole formed therein, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. A filter medium is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed; At least one of the tank walls of the first main bed, the second main bed and the auxiliary bed, including the first overflow weir, is covered with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

23. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, At least one of the first main bed, the second main bed, and the auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are substantially parallel to the tank wall, in the vicinity of the tank wall on the downstream side of the wastewater to be poured in, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. A filter medium is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed; The first main bed including the first overflow weir, the second main bed including the second overflow weir, and one or more of the auxiliary bed walls are covered with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

24. A first main bed and a second main bed each consisting of a tank surrounded by walls on all four sides; an auxiliary bed adjacent to the first main bed and the second main bed and consisting of a tank surrounded by walls on all four sides; It is composed of A part or the whole of each tank wall separating the first main bed and the auxiliary bed of the second main bed is made of a first overflow weir that is lower than the other tank walls of the first main bed and the second main bed; A part or the whole of a tank wall of the auxiliary bed other than the first overflow weir is a second overflow weir that is lower than the other tank walls of the auxiliary bed, At least one of the first main bed, the second main bed, and the auxiliary bed is provided with one or more plate-shaped auxiliary weirs that are lower than the tank wall and are substantially parallel to the tank wall, in the vicinity of the tank wall on the downstream side of the wastewater to be poured in, The auxiliary dam has a through hole formed therein, Underdrain drainage pipes are provided at the bottoms of the first main bed, the second main bed and the auxiliary bed, and extend from the first main bed and the second main bed to the outside of the auxiliary beds. A filter medium is laid in the tanks of the first main bed, the second main bed and the auxiliary bed, or in the tanks of the first main bed and the second main bed; The first main bed including the first overflow weir, the second main bed including the second overflow weir, and one or more of the auxiliary bed walls are covered with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

25. The main floor is a tank surrounded by walls on all four sides. It is composed of On the floor, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; At the bottom of the bed, a culvert drainage pipe is installed that runs to the outside of the bed. The inside of the tank is lined with filtration material. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

26. The main floor is a tank surrounded by walls on all four sides. It is composed of On the floor, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; The auxiliary dam has a through hole formed therein, At the bottom of the bed, a culvert drainage pipe is installed that runs to the outside of the bed. The inside of the tank is lined with filtration material. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

27. The main floor is a tank surrounded by walls on all four sides. It is composed of On the floor, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; At the bottom of the bed, a culvert drainage pipe is installed that runs to the outside of the bed. The inside of the tank is lined with filtration material. One or more of the tank walls of this bed are lined with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

28. The main floor is a tank surrounded by walls on all four sides. It is composed of On the floor, one or more plate-shaped auxiliary weirs lower than the tank wall are provided in close proximity to the tank wall on the downstream side of the wastewater to be poured and approximately parallel to the tank wall; The auxiliary dam has a through hole formed therein, At the bottom of the bed, a culvert drainage pipe is installed that runs to the outside of the bed. The inside of the tank is lined with filtration material. One or more of the tank walls of this bed are lined with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

29. The main floor is a tank surrounded by walls on all four sides. It is composed of At the bottom of the bed, a culvert drainage pipe is installed that runs to the outside of the bed. The inside of the tank is lined with filtration material. One or more of the tank walls of this bed are lined with filtration material on the inner wall side. An apparatus for solid-liquid separation, dehydration and drying of wastewater.

30. The above-mentioned culvert drainage pipe has the following features: An on-off valve is provided at the discharge port outside the main bed (including the first main bed and the second main bed) or outside the auxiliary bed.

30. An apparatus for solid-liquid separation, dehydration and drying of wastewater according to any one of claims 1 to 29.

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