JP5717061B2 - Vacuum suction processing method and vacuum suction processing system - Google Patents

Description

  The present invention relates to a vacuum suction processing method and a vacuum suction processing system in muddy water treatment, sludge dehydration solidification treatment, or soft ground improvement treatment.

  For the treatment of turbid water generated at construction sites, etc., and for the treatment of turbid water accompanying the purification of closed water areas, suspended solids in the wastewater (SS components such as fine soil such as clay, silt, cement components, phytoplankton, Removal, solidification, and dehydration of zooplankton, food, food residues, etc. are inevitable requirements.

  A filter press is generally used as a technology that can meet this requirement. However, since the apparatus is a large-scale pressurizing apparatus and has low energy efficiency, it is not suitable for on-site turbid water treatment. There is also an on-track small filter press, but it is only applicable to dehydration and solidification (cake preparation) of fine soil such as clay, silt, and cement components. It is enough.

  In addition, in order to increase the turbid water treatment capacity, a water tank such as a sedimentation separation water tank using a flocculant, a flocculant stirring tank, a pH adjustment tank, a neutralization tank, etc. is required. A muddy water tank for storing muddy water being treated is required. Furthermore, since the flocculant is mixed into the discharged dehydrated cake, in many cases, disposal as industrial waste is required, which is a problem from the viewpoint of recycling and cost.

  On the other hand, vacuum pumps used for conventional muddy water treatment and sludge dewatering and solidification treatment such as sediment sludge settled and deposited on the bottom of oceans, lakes, rivers, etc. have a low vacuum generation function (for example, the degree of vacuum − 0.05 MPa to -0.08 MPa, displacement of about 100 L / m), the time to reach a vacuum is long (for example, about several minutes), and it is difficult to ensure a constant amount of drainage.

  Also known is a method (vacuum consolidation method) that promotes consolidation of the ground by placing a drain material in soft ground and then depressurizing the ground by applying negative pressure using a vacuum pump suction device. It has been. However, in the method using a vacuum pump, the vacuum generation function is still low, the time to reach the vacuum is long, and it is difficult to ensure a constant amount of drainage.

JP 2007-167789 A

  An object of the present invention is to provide a vacuum suction processing method capable of vacuum suction with a simple structure, a short time to vacuum, a high degree of vacuum, and a high displacement, in muddy water treatment, sludge dehydration solidification treatment or soft ground improvement treatment And providing a vacuum suction processing system.

The present invention uses an ejector to vacuum suction by generating a negative pressure by driving water, a vacuum suction processing method for performing turbid water treatment or sludge dewatering solidification treatment, immersed in water to be treated contains suspended solids A vacuum suction step of forming a negative pressure inside the filter medium by vacuum suction using the ejector connected to the filter medium, and attaching the suspended substance to the surface of the filter medium; By closing the discharge-side flow path, the separation step of separating the suspended matter adhering to the surface of the filter medium by causing the drive water to flow backward, and closing the discharge-side flow path of the ejector The vacuum suction method includes at least one of a reverse cleaning process in which the filter medium is back cleaned by flowing back the driving water .

  Moreover, this invention is a method in which the said filter medium becomes a cylindrical shape when it swells in the said vacuum suction processing method.

Further, the present invention provides a vacuum suction processing method for performing soft ground improvement processing by using an ejector that generates a negative pressure by driving water to perform vacuum suction. A vacuum suction step for performing soft ground improvement processing by vacuum suction using the ejector connected to a material, and a backflow step for backflowing the driving water by closing the discharge-side flow path of the ejector. It is the method of including.

Further, the present invention comprises an ejector for vacuum suction by generating a negative pressure by driving water, by vacuum suction using the ejector, and processing means for performing a turbid water treatment or sludge dewatering solidification treatment, the The treatment means is a filter medium, and vacuum suction is performed using the ejector connected to the filter medium immersed in the water to be treated containing suspended substances, thereby forming a negative pressure inside the filter medium, The suspended matter is adhered to the surface of the filter material, and muddy water treatment or sludge dehydration solidification treatment is performed. Further, the flow of the discharge side of the ejector is closed to reversely flow the driving water, and the filtration peeling the suspended substances attached to the surface of the wood, or a vacuum suction processing system Ru comprising a reverse flow means for backwashing the filtration medium.

  Moreover, this invention is a system which becomes a cylindrical shape when the said filter medium swells in the said vacuum suction processing system.

Further, the present invention comprises an ejector that generates a negative pressure by driving water and performs vacuum suction, and a processing means for performing soft ground improvement processing by vacuum suction using the ejector, the processing means There is a drain member, said drain member installed in soft ground improvement target by vacuum suction using the ejector connected to the drain member, have rows soft soil improving treatment, and further, the discharge of the ejector It is a system provided with the backflow means which backflows the said drive water by closing the flow path of the side .

  In the present invention, by using an ejector that generates a negative pressure by driving water and sucks a vacuum, in a turbid water treatment, sludge dehydration solidification treatment or soft ground improvement treatment, the time to vacuum is short and high in a simple configuration. It is possible to provide a vacuum suction processing method and a vacuum suction processing system capable of performing vacuum suction with a degree of vacuum and a high displacement.

It is a schematic structure figure showing an example of a muddy water treatment system concerning an embodiment of the present invention. It is a schematic block diagram which shows an example of the dehydration apparatus in the muddy water processing system which concerns on embodiment of this invention. It is a schematic block diagram which shows an example of the filtration panel in the muddy water processing system which concerns on embodiment of this invention. It is a schematic block diagram which shows an example of the ejector in the muddy water processing system which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the filter medium in the muddy water processing system which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the muddy water processing system which concerns on embodiment of this invention. It is the schematic which shows the mode of the driving water at the time of backwashing in the ejector of the muddy water processing system which concerns on embodiment of this invention, and the flow of air. It is the schematic which shows the mode of the flow of the backwashing water at the time of backwashing in the filtration panel of the muddy water processing system which concerns on embodiment of this invention. It is a schematic structure figure showing an example of the soft ground improvement processing system concerning the embodiment of the present invention. It is a schematic block diagram which shows an example of the usage method of the soft ground improvement processing system which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the usage method of the soft ground improvement processing system which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the usage method of the soft ground improvement processing system which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the usage method of the soft ground improvement processing system which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

<Muddy water treatment, sludge dehydration solidification treatment>
A schematic configuration of an example of a muddy water treatment system (sludge dehydration solidification treatment system) according to an embodiment of the present invention is shown in FIG. 1 and the configuration will be described. The muddy water treatment system 1 includes at least one dehydrator 10, an ejector 12 as a vacuum suction means, and a muddy water tank 14. They may be mounted on a vehicle such as a truck to form an on-track system. Further, the muddy water treatment system 1 may include a driving device (not shown) for moving the dehydrating device 10 and a prefiltration device such as a sedimentation water tank and a vibrating screen on the front side of the muddy water tank 14.

  In the muddy water treatment system 1 of FIG. 1, the dehydrator 10 is connected to the suction port 42 of the ejector 12 by a treated water pipe 48, and the treated water pipe 46 is connected to the outlet on the discharge side of the ejector 12. A drive water pipe 44 is connected to the drive water inlet of the ejector 12. In the example of FIG. 1, the muddy water treatment system 1 includes two dehydration apparatuses 10, but the number of dehydration apparatuses 10 is not limited to this.

  The dehydrator 10 includes, for example, at least one filtration panel 20 that is a filtration device as a processing unit and a frame body 22 that holds the filtration panel 20 as illustrated in FIG. In the example of FIG. 2, the four filtration panels 20 are fixed so as to be substantially parallel to the frame body 22, but the number and shape of the filtration panels 20 are not limited thereto.

  For example, as shown in FIG. 3, the filter panel 20 includes a plate-shaped panel body 24, a filter medium 26, an upper air chamber 28, a lower air chamber 30, a separating member 32, an upper pipe 34, and a lower pipe. It consists of a pipe 36 and the like.

  The panel body 24 is provided with a passage (not shown) extending in the vertical direction of the panel body 24 inside, and further, a hole (not shown) communicating with the passage on at least one of the front and back surfaces. Many are formed.

  The filter material 26 is, for example, a cloth material, and has a filtration function that allows moisture to pass through but does not pass suspended substances or the like of a predetermined size. Further, when a gas such as air is injected inside, the inside expands. It has moderate air blocking properties. The filter medium 26 is attached to the surface of the panel body 24 in a state where the filter medium 26 covers at least the panel body 24 where the holes are formed. The shape and material of the filter medium 26 are not particularly limited as long as they can capture and separate suspended substances from water to be treated such as turbid water. What is necessary is just to select the shape and material of the filter medium 26 according to the property of the to-be-processed water used as a process target, the property, etc. of the suspended substance contained.

  The upper air chamber 28 and the lower air chamber 30, for example, are each composed of a cylindrical tube made of metal or the like with both ends closed, and the end of the panel body 24 is airtight from the opening formed on the side surface. The passages formed in the panel main body 24 and the respective interiors communicate with each other.

  The upper air chamber 28 is connected to the upper pipe 34 via a plug or the like, and the lower air chamber 30 is similarly connected to the lower pipe 36 via a plug or the like. The lower air chamber 30 is connected to the lower pipe 36 by providing a plug on the lower surface of the lower air chamber 30.

  The separation member 32 is, for example, a rubber-like tube. By inserting the separating member 32 between the panel main body 24 and the filter medium 26, it is possible to facilitate the peeling of the suspended substance at the corners of the filter medium 26 in the peeling process. The spacing member 32 is a cloth member formed in a bag shape, for example, and may have a structure that expands outward when a gas such as air is injected therein. The gas may be expanded by sending a gas such as air. The separation member 32 may be provided at a location where the filter medium 26 is attached to the panel main body 24, and the attachment location is not particularly limited.

  The frame 22 is a frame such as a rectangular parallelepiped made of aluminum, for example, and a hanging wire 38 is attached to the upper part. An upper air chamber 28 is fixed to the upper surface of the frame body 22, and a lower air chamber 30 is fixed to the lower portion of the frame body 22.

  The drive device is, for example, a transfer function for moving the dehydrator 10 in the vertical direction for lifting or lowering the dehydrator 10 from the muddy water tank 14 or moving the dehydrator 10 in a substantially horizontal direction via the wire 38 or the like. Is provided.

  The preliminary filtration apparatus such as a vibrating screen that may be provided on the upstream side of the muddy water tank 14 is not particularly limited as long as it preliminarily filters muddy water to be treated. The vibrating screen only needs to have a mesh smaller than the particle size of the suspended substance contained in the turbid water to be treated, and examples thereof include those made of metal and resin. As the vibrating screen, for example, a screen having a fine mesh (for example, a hole diameter of about 75 μm to 125 μm) can be used. By disposing a pre-filtration device such as a vibrating screen, the processing capacity of the dehydrating and solidifying device can be kept low. In addition, an on-track system may be mounted on a vehicle such as a truck including a preliminary filtering device.

  The ejector 12 has a structure in which a negative pressure is generated by the driving water from the driving water pipe 44, the processing water from the dehydrating apparatus 10 is sucked from the suction port 42, and the processing water is discharged from the processing water pipe 46 together with the driving water. ing. The ejector 12 may have an intake port 40 for sucking gas. Further, a valve 47 may be installed at the intake port 40 so that intake air can be opened and closed. A valve 49 may be installed in the treated water pipe 48. The flow rate of the ejector 12 can be controlled by adjusting the opening / closing amounts of the valve 47 and the valve 49.

  FIG. 4 is a schematic configuration diagram illustrating an example of the ejector 12 in the muddy water treatment system 1 according to the embodiment of the present invention. The ejector 12 is provided on the inlet side of the main pipe 50 having a cylindrical shape, the nozzle 52 having an inner diameter of the outlet smaller than the inner diameter of the inlet for introducing driving water, an inlet side of the main pipe 50, And a suction port 42 for sucking in the treated water, which is provided between the outlet side and the outlet side. It may be provided between the suction port 42 and the inlet side of the main pipe 50 and on the downstream side of the outlet of the nozzle 52, and may have an intake port 40 for sucking gas. The position of the suction port 42 may be upstream from the outlet of the nozzle 52, but it is preferable that it is downstream from the outlet of the nozzle 52 in consideration of suction efficiency and the like. The ejector 12 may be provided with a cavityless tube 54 that is a cylindrical tube or the like that is located a predetermined distance L from the outlet of the nozzle 52 and has an inner diameter D that is larger than the inner diameter d of the outlet of the nozzle 52. Good.

  In the ejector 12, when driving water is introduced from the inlet side of the ejector 12, the driving water passes through the nozzle 52 whose diameter is narrowed inside and is ejected as a high-pressure jet from the outlet of the nozzle 52. In the high-pressure jet ejected from the nozzle 52, the jet nucleus diffuses as it advances in the straight direction, and the momentum diffuses and becomes lean. However, the air sucked from the intake port 40 in the cabless tube 54 is the jet nucleus. While maintaining the momentum with almost no reduction in flow velocity with the air flow caused by the vacuum region formed around the water, it goes straight to the suction port 42 side, forms a new negative pressure suction region, and the treated water Sucked. That is, the cabless tube 54 has the function of a nozzle of a jet (a mixed fluid of gas (air, etc.) and liquid (driving water)), and can maintain stable suction performance.

  For example, when driving water is jetted from the nozzle 52 as a high-pressure jet at a high speed with a driving pressure of 3 MPa or more, a negative pressure with a high degree of vacuum is generated at the outlet (jet port) of the nozzle 52. In general, when a high-pressure jet is injected in a closed pipe, turbulent flow is generated around the nozzle injection port (also called cavitation phenomenon), which may damage components and obstruct the straight flow of the jet. Therefore, if the intake port 40 is provided and the outside air is sucked from the intake port 40, the occurrence of the cavitation phenomenon and the diffusion of the jet flow can be prevented.

  The ejector 12 only needs to generate a negative pressure by driving water, and is not limited to the above configuration, and is not particularly limited, but the above configuration has an optimal configuration for steady vacuum suction. . The inner diameter and length of the ejector 12 are not particularly limited, but can be reduced to, for example, an inner diameter of about 10 mm to 40 mm and a length of about 0.5 m to 1 m.

  The drive water of the ejector 12 is not limited to water but may be a fluid such as liquid or gas, but is usually water. Driving water may be prepared separately, or at least part of the treated water may be circulated and used.

  In the ejector 12, the gas sucked from the intake port 40 is, for example, air, bactericidal gas such as chlorine gas, ozone, or the like, but is usually air (outside air). When a sterilizing gas such as chlorine gas or ozone is used as the gas sucked from the intake port 40, the treated water can be sterilized easily. Further, the aeration of the treated water can be efficiently performed simultaneously by the high-pressure jet of gas-liquid mixing.

  The muddy water tank 14 is not particularly limited as long as it stores the water to be treated and can immerse the dehydrator 10. In the muddy water treatment system 1 of FIG. 1, the dewatering device 10 is immersed in the water to be treated in the muddy water tank 14 and vacuum suction treatment is performed, but the muddy water tank is not provided, and the treatment target such as a pond, river, lake, etc. The dehydrating apparatus 10 may be directly immersed and a vacuum suction process may be performed.

  Next, the operation of the muddy water treatment system 1 and the muddy water treatment method will be described with reference to FIG.

  Water to be treated such as turbid water containing suspended matter (SS component) subject to turbid water treatment is pre-filtered with a vibrating screen, etc., if necessary, and has a relatively coarse particle size such as suspended matter, sand, gravel, etc. After being removed, the liquid is fed to the muddy water tank 14 by a pump or the like. An ejector may be used to supply the water to be treated to the muddy water tank 14. As shown in FIG. 1, the dehydrating apparatus 10 suspended by a driving device (not shown) is stored in a muddy water tank 14 and immersed in muddy water. When the valve 49 is provided, the ejector 12 connected to, for example, the lower pipe 36 of the dehydrating apparatus 10 is activated in the open state, and when the driving water is supplied at a predetermined flow rate and driving pressure through the driving water pipe 44, a negative pressure is generated. Is generated, and vacuum suction is constantly performed (vacuum suction process). At this time, the upper pipe 34 is closed. Then, the water passes through the filter material 26 and is sucked into the filter panel 20, and the treated water is sucked into the ejector 12 through the lower pipe 36 and the treated water pipe 48 and from the suction port 42. It is discharged together with the drive water from the outlet on the discharge side through the treated water pipe 46. On the other hand, suspended substances such as sludge that do not pass through the filter medium 26 are filtered by the filter medium 26 and gradually adhere to the surface of the filter medium 26.

  When the amount of water discharged from the dehydrator 10 decreases to a predetermined amount, it is determined that the sludge has adhered to the surface and the water permeability has decreased. The surface of the filter medium 26 of the dehydrating apparatus 10 is in a state where suspended substances such as sludge are attached. Next, the suction operation by the ejector 12 from the lower pipe 36 is stopped, and the inside of the filter medium 26 is expanded by pressure-feeding air from the upper pipe 34 by a compressor or the like. Then, the filter medium 26 is greatly separated from the panel main body 24, and suspended substances such as sludge adhering to the surface of the filter medium 26 are peeled off and dropped (peeling step).

  When suspended substances such as sludge adhering to the surface of the filter medium 26 are sufficiently peeled off, the ejector 12 is activated again and vacuum suction is regularly performed (vacuum suction process) as necessary. The turbid water treatment is performed by intermittently repeating the vacuum suction step and the peeling step described above. According to the vacuum suction processing method according to the present embodiment, it is efficient by using an ejector that has a short time to vacuum (for example, about several seconds) and can perform vacuum suction with a high degree of vacuum and a high displacement. Turbid water treatment can be performed.

  Next, a sludge dehydration solidification method using the muddy water treatment system 1 will be described.

  The dehydrator 10 is immersed in water to be treated such as turbid water containing suspended matter (SS component) to be treated with turbid water, and is evacuated regularly by the ejector 12 in the same manner as the turbid water treatment (vacuum suction step). ). Moisture is sucked into the filter panel 20 through the filter medium 26, and treated water is sucked into the ejector 12 from the suction port 42 through the lower pipe 36 and the treated water pipe 48, and is discharged to the ejector 12. Is discharged together with the drive water through the treated water pipe 46 from the outlet of the water. On the other hand, suspended substances such as sludge that do not pass through the filter medium 26 are filtered by the filter medium 26 and gradually adhere to the surface of the filter medium 26.

  When the amount of water discharged from the dehydrating device 10 decreases to a predetermined amount, it is determined that the sludge has adhered to the surface and the water permeability has decreased, and the dehydrating device 10 is pulled up by the driving device. The surface of the filter medium 26 of the dehydrating apparatus 10 is in a state where suspended substances such as sludge are attached. Note that the water to be treated may be extracted from the muddy water tank 14 without lifting the dehydrator 10 from the muddy water tank 14.

  When the water to be treated is removed from the muddy water tank 14 while the dewatering device 10 is lifted or placed on the ground or the like, the dewatering device 10 is continuously left in the state of the ejector, for example. 12 is vacuumed in the atmosphere, and moisture contained in the sludge is sucked through the lower pipe 36. When the moisture content of the sludge further decreases, air is sucked through the sludge, and the sludge is air-dried by the passing air. Moisture in the filtration panel 20 is sucked by the ejector 12 from the lower pipe 36 and discharged to the outside of the filtration panel 20.

  When the sludge is dried to a predetermined moisture content, the upper pipe 34 is opened to the atmosphere, and moisture remaining in the filtration panel 20 and the like is sucked from the lower pipe 36. Next, the suction operation by the ejector 12 from the lower pipe 36 is stopped, and the inside of the filter medium 26 is expanded by pressure-feeding air from the upper pipe 34 by a compressor or the like. Then, the filter medium 26 is greatly separated from the panel main body 24, and suspended substances such as sludge adhering to the surface of the filter medium 26 are peeled off and dropped (peeling step). Note that suction by the ejector 12 may be performed from the lower pipe 36 together with the pressure feeding of the air from the upper pipe 34.

  The sludge dropped from the surface of the filter medium 26 has a low moisture content and can be easily transported, and can be easily used or processed into other things.

  In the muddy water treatment system 1 of FIG. 1, the ejector 12 is used to generate a negative pressure, and the treated water from the dehydrator 10 is discharged together with the drive water of the ejector that sucks the treated water. The treated water may be circulated together with the driving water discharged from the ejector 12 and used as the driving water for the ejector 12. In this case, the muddy water treatment system 1 may include a pump or the like as circulation means for circulating at least a part of the treated water and driving water discharged from the ejector 12 and using them as driving water for the ejector 12.

  A vacuum pump used in a conventional turbid water treatment apparatus, vacuum dehydration solidification apparatus or the like has a low vacuum generation function (for example, a degree of vacuum of about -0.05 MPa to -0.08 MPa, a displacement of about 100 L / m), and a predetermined value. It takes a long time to reach the degree of vacuum (for example, several minutes). Further, the vacuum pump normally requires a water trap, a drain pump, and the like, and it has been difficult to ensure a constant amount of drainage. However, the ejector 12 according to the present embodiment has, for example, a degree of vacuum of −0.098 MPa. It is possible to achieve a displacement of 1,000 L / m or more, a water trap and a drain pump are not required, the drainage function is sufficient, and the time to reach a vacuum is short (for example, about several seconds). As a vacuum suction device used for turbid water treatment and sludge dehydration solidification treatment like the turbid water treatment system 1, it is optimal for downsizing of the device in terms of performance, function, weight, required area, operability, etc. An on-track system becomes possible.

  In addition, by using a plurality of filtration panels 20 and vacuum suction from the inside of the filter medium 26 by the ejector 12, suspended substances such as soil particles are adsorbed on the surface of the filter medium 26 in the process of filtering muddy water, When the thickness of the sludge cake reaches, for example, about 10 mm to 20 mm, the slurry is lifted from the muddy water tank 14 containing muddy water, and the vacuum dehydration of the sludge is continued in the air to obtain a predetermined moisture content (for example, about 40% by weight). Can be secured.

  For example, the filtration time in the muddy water tank 14 is 10 minutes to 20 minutes, the dehydration time in air is 5 minutes to 7 minutes, the cake peeling time is about 3 minutes, and one work cycle of 30 minutes is sufficient. This has a dehydration and solidification capacity of about 5 to 8 times compared to the standard work cycle of filter press for 4 hours (including backwashing time). Is possible. For this reason, it is possible to reduce the cost and the initial investment, and the cost and the initial investment are, for example, ½ or less.

  The filter press apparatus needs to form a filter chamber made of steel or the like that wraps the filter plate, and requires a large muddy water tank. On the other hand, in the turbid water treatment system according to the present embodiment, it is not necessary to form a filter chamber as in the filter press device, and a regular vacuum suction process by the ejector 12 is performed by directly immersing the filter medium in a turbid water tank having an appropriate capacity. It can be performed. Moreover, efficient muddy water treatment is possible by circulating at least a part of the treated water and the driving water to balance the muddy water treatment amount (filtration flow rate) and the cake production amount by dehydration solidification. Since it is not necessary to use a flocculant, it is not necessary to provide a water tank such as a flocculant stirring tank, a pH adjustment tank, or a neutralization tank, leading to a reduction in equipment. Since it does not contain additives such as flocculants, it is not necessary to treat the cake with industrial waste, and it can be reused on-site, resulting in a high cost reduction effect.

  As a space-saving issue such as a muddy water treatment system and a sludge dewatering solidification treatment system, it is necessary to expand the filter medium 26 with compressed air when the cake is peeled off in the air. For example, it is desirable to make it about 10 cm. In the present embodiment, for example, the filter media 26 may be unitized, and the filter media 26 of different units may be stacked in a comb shape in the muddy water tank 14 to save space. With this configuration, after filtration of muddy water, two units stacked in a comb shape are lifted by a driving device and separated into left and right in a soil removal space etc. while performing vacuum dehydration in the air. The cake can be peeled by expanding the filter medium 26 with compressed air. When the filtration process is performed again, each unit is superposed on the original shape, and then the units are settled in the muddy water tank 14 and vacuum suction by the ejector 12 is started.

  Moreover, in order to ensure the filtration flow rate, some units do not raise into the air in the same turbid water tank 14, but filter by the ejector 12 and expansion of the filter medium 26 by compressed air at intervals of 20 to 30 seconds. A high filtration flow rate can be secured by repeating the peeling.

  According to the vacuum suction processing method according to the present embodiment, the use of an ejector that generates a negative pressure with driving water and has a short time to reach a vacuum, and that performs vacuum suction with a high degree of vacuum and a high displacement, etc. The turbid water treatment can be performed without depending on the chemicals, and an extremely efficient, economical and compact system can be provided.

  In the vacuum suction processing method according to the present embodiment, attention is paid to the negative pressure suction function of the ejector that can achieve a high vacuum with a high degree of vacuum and a high displacement, with a short time to vacuum, a compact, A high performance muddy water treatment system and sludge dewatering and solidification treatment system can be realized. For example, a mobile type on-track type that can be mounted on a vehicle such as a truck to a stationary plant type can be flexibly supported.

  In the vacuum suction processing method according to the present embodiment, by using an ejector as the vacuum suction means, aeration of the treated water is promoted by the suction function of the ejector, and the treated water mixed with gas and liquid can be aerated. Furthermore, even when harmful volatile substances such as volatile organic compounds (VOC), bactericides, and the like are mixed in the water to be treated, vaporization of the volatile substances is promoted by the suction function of the ejector. For example, when drinking water is secured by this system, if the system is treated with this system after sterilizing and disinfecting a volatile sterilizing agent such as chlorine gas on the front side of the ejector 12, the suction of the ejector 12 is performed. Residual volatile substances such as residual chlorine in treated water can be reduced by the function. Thus, sterilization and aeration can be performed simultaneously. Furthermore, an advanced water treatment apparatus may be installed on the rear stage side of the muddy water treatment system according to the present embodiment for removing harmful substances.

  Since the turbid water treatment system 1 uses the negative pressure suction function of the ejector, it can be applied not only to turbid water treatment such as turbid water containing suspended solids but also to sludge dewatering and solidification treatment such as bottom sediment and mud. In order to utilize the negative pressure suction function of the ejector in the slurry suction process, the slurry that has passed through the ejector is aerated and effective in water purification, and the fine soil particles are crushed, so that the mesh is fine (for example, , About 75 μm to 125 μm) can be classified by a vibrating screen, and the amount of dehydrated and solidified cake generated is suppressed.

  In this embodiment, as a system used for muddy water treatment and sludge dehydration solidification treatment, any system that performs muddy water treatment and sludge dehydration solidification treatment using vacuum suction may be used, and is limited to the configuration of the muddy water treatment system 1 described above. Is not to be done. For example, a system using a filtration device as shown in FIG. 5 can be exemplified.

  The filtration device shown in FIG. 5 is a filtration cylinder 21 including a filter medium 27 that has a cylindrical shape such as a cylindrical shape when expanded. The filtration cylinder 21 is in a state of covering at least a portion where holes are formed in the vicinity of both ends of a hollow body 25 such as a cylindrical shape in which a large number of holes (not shown) communicating with an internal passage are formed. The filter medium 27 is attached. At least one end of the hollow body 25 is connected to the suction port 42 of the ejector 12 by the treated water pipe 48, and vacuum suction processing is performed. With this configuration, the suspended matter or the like is easily peeled off at the connecting end of the filter medium 27 to the hollow body 25 in the peeling step, which is efficient. The filter material 27 is, for example, a cloth material, and has a filtration function that allows moisture to pass through but does not allow suspended substances of a predetermined size to pass through. Further, when a gas such as air is injected inside, the inside expands. It has moderate air blocking properties.

  The shape and material of the filter medium 27 are not particularly limited as long as the filter medium 27 has a cylindrical shape when inflated and can capture and separate suspended substances from water to be treated such as muddy water. The shape of the filter medium 27 when inflated is, for example, a cylindrical shape such as a cylindrical shape, an elliptical cylindrical shape, or a polygonal cylindrical shape, a plate shape, a spherical shape, a polygonal shape, etc. Cylindrical shapes and elliptical cylindrical shapes are preferred so that the corners are as small as possible when they swell due to the separation of turbid matter. What is necessary is just to select the shape and material of the filter medium 27 according to the property of the to-be-processed water used as a process target, the property, etc. of the suspended substance contained. The shape and material of the hollow body 25 are not particularly limited. Examples of the shape include a cylindrical shape such as a cylindrical shape, an elliptical cylindrical shape, and a polygonal cylindrical shape, a plate shape, a spherical shape, and a polygonal shape. . The shapes or sizes of the hollow body 25 and the filter medium 27 may be the same or different. When the shape or size of the hollow body 25 and the filter medium 27 are different, the suspended substance can be easily separated in the separation step.

  In this embodiment, the water to be treated is, for example, muddy water after washing sand such as a sandbox, muddy water after washing soil such as vegetable garden, muddy water containing clay, silt, etc., cement component, etc. Turbid water containing various chemicals, muddy water containing phytoplankton such as red sea urchin, zooplankton such as red tide, foods such as miso and soy sauce, muddy water containing food residues such as sake lees and juice squeezed koji, ponds, rivers The water of a lake etc. is mentioned, However, It is not limited to these. For example, various muddy water treatments from the discharge level to the securing of drinking water are possible.

  Moreover, you may install an advanced water treatment apparatus by the back | latter stage side of the muddy water treatment system which concerns on this embodiment for the utilization as drinking water, the removal of a harmful substance, etc.

  FIG. 6 shows a schematic configuration of another example of the muddy water treatment system according to the embodiment of the present invention. The muddy water treatment system 2 includes a valve 56 in the middle of the treated water piping 46 at the outlet on the discharge side of the ejector 12 in addition to the configuration of FIG. The ejector 12 closes the flow path on the discharge side of the ejector 12 to cause the driving water to flow backward together with the gas sucked from the intake port 40, thereby to remove suspended substances and the like adhering to the surface of the filter medium 26 of the dehydrator 10. It also functions as a backflow means for peeling or backwashing the filter medium 26.

  For example, in the same manner as in the system of FIG. 1, the filter medium 26 of the dehydrating apparatus 10 is back-washed after the vacuum suction process and the peeling process are performed for a predetermined time. When the discharge side valve 56 in FIG. 6 is closed while the ejector 12 is being driven, the driving water and the air sucked from the intake port 40 flow backward through the treated water pipe 48 from the intake port 42 as shown in FIG. Then, as shown in FIG. 8, the jet back cleaning of the filter medium 26 of the filter panel 20 is performed (back cleaning process). The suspended substance remaining on the surface of the filter medium 26 is peeled off by the jet. Further, the flow rate or pressure of the backwash water (backflow water) by the ejector 12 can be controlled by adjusting the opening / closing amounts of the valve 47 and the valve 49.

  When the reverse cleaning is almost finished, the ejector 12 is stopped. Thus, by using the vacuum suction ejector not only for vacuum suction but also for reverse cleaning, it is not necessary to separately use equipment such as a compressor. Even when the filtration medium becomes clogged with suspended substances in the water to be treated and the filtration flow rate is reduced with the passage of the filtration process time, the surface of the filtration medium can be efficiently obtained in a short backwashing process time with a simple device configuration. The suspended substances adhering to etc. are peeled off and washed, and the filtration function is restored.

  Further, for example, when the muddy water treatment is performed by the vacuum suction process for a predetermined time in the same manner as in the system of FIG. 1 and the amount of water discharged from the dehydrator 10 is reduced to a predetermined amount, the sludge adheres to the surface. Judging that water permeability has decreased. Next, by closing the discharge-side valve 56 while driving the ejector 12, the driving water flows backward together with the gas sucked from the intake port 40 and adheres to the surface of the filter medium 26 of the dehydrator 10. Suspended substances such as sludge are peeled off and dropped (peeling process). When suspended substances such as sludge adhering to the surface of the filter medium 26 are sufficiently peeled off, the discharge side valve 56 is opened while the ejector 12 is driven as necessary, so that it is steadily again. Vacuum suction (vacuum suction process). The turbid water treatment is performed by intermittently repeating the vacuum suction step and the peeling step described above. According to the vacuum suction processing method according to the present embodiment, an ejector capable of performing vacuum suction with a short vacuum arrival time, a high degree of vacuum, a high displacement, and a simple configuration. By using turbid water treatment can be performed efficiently.

  The installation position of the valve 56 in the treated water piping 46 is not particularly limited.

<Soft ground improvement treatment>
FIG. 9 shows a schematic configuration of an example of the soft ground improvement processing system according to the embodiment of the present invention, and the configuration will be described. The soft ground improvement processing system 3 includes at least one drain material 60 as a processing means and an ejector 62. In the example of FIG. 9, the soft ground improvement processing system 3 includes three drain members 60, but the number of drain members 60 is not limited to this. In addition, you may use the soft ground improvement processing system 3 which concerns on this embodiment for a well point construction method etc. In this case, the drain material 60 functions as a pumping pipe. Moreover, you may use an ejector for a deep well construction method.

  In the soft ground improvement processing system 3 of FIG. 9, the suction port near the upper end portion of the drain material 60 installed in the soft ground 74 for improving the soft ground is sucked into the ejector 62 by the treated water pipe 64. A treated water pipe 68 is connected to the outlet 66 on the discharge side of the ejector 62. A drive water pipe 70 is connected to the drive water inlet of the ejector 62. Valves 65 and 69 may be installed in the treated water pipes 64 and 68, respectively. A valve 67 may be installed at the intake port 72. By adjusting the opening / closing amounts of the valve 65 and the valve 67, the flow rate or pressure of the ejector 62 can be controlled. Further, when the valve 69 is closed while the ejector 62 is being driven, the driving water can be made to flow backward.

  The drain material 60 is installed in the soft ground 74 in order to suck pore water in the soft ground 74. As the drain material 60, for example, a material at least partially composed of a porous member can be used.

  Next, the operation of the soft ground improvement processing system 3 will be described with reference to FIG.

  When the ejector 62 connected to the suction port near the upper end of the drain material 60 is activated and the driving water is supplied through the driving water pipe 70 at a predetermined flow rate and driving pressure, a negative pressure is generated and is constantly generated. Vacuum suction (vacuum suction process). Then, the moisture from the ground passing through the portion composed of the porous member of the drain material 60 is sucked into the drain material 60, and the moisture from the ground passes through the treated water pipe 64 as treated water, The air is sucked into the ejector 62 from the suction port 66, and discharged from the discharge side outlet of the ejector 62 through the treated water pipe 68 together with the driving water.

  In the vacuum suction processing method according to the present embodiment, the soft ground improvement processing system with high processing performance is achieved by the negative pressure suction function of the ejector that can achieve a high vacuum with a high degree of vacuum and a high displacement, with a short time to vacuum. Is possible.

  In the vacuum suction processing method according to the present embodiment, for example, as shown in FIG. 10, at least a part of the improvement range of the soft ground 74 in which the drain material 60 is installed sank with the progress of the soft ground improvement processing. However, since the ejector that can be miniaturized and can be easily installed is used, the ejector 62 can be installed on the subsidized ground within the improved range. As a result, it is possible to avoid a loss corresponding to the difference in height due to subsidence from the height of pumped water due to vacuum. Further, treated water (drainage from the ground) and driving water can be easily pumped up to a high position (for example, to the height of the ground before subsidence) by a high-pressure jet by the ejector 62. According to the ejector, in the case of 3 MPa driving water, theoretically 300 m of water can be pumped. When the height required for pumping up treated water and driving water is large, a plurality of ejectors may be connected in series to form a multistage configuration. In the case of a vacuum pump, a water trap, a drainage pump, etc. are usually required, and an increase in the size of the apparatus is inevitable, so such installation is difficult. Moreover, since the vacuum pump is normally a vacuum degree of about -0.05 MPa to -0.08 MPa, and there is a loss of a degree of vacuum of about -0.05 MPa due to the subsidence of 5 m, it is similar to the ejector 62 of FIG. Usage is difficult. If an ejector is used, it is possible to easily pump up to a high position that cannot be pumped by a vacuum pump. In the example of FIG. 10, the ejector 62 may be installed on the ground that has not subsided outside the improved range, if necessary.

  In the vacuum suction processing method according to the present embodiment, for example, as shown in FIG. 11, at least a part of the improvement range of the soft ground 74 in which the drain material 60 is installed sinks with progress of the soft ground improvement processing. Even if the embankment 76 is piled up, an ejector that can be reduced in size and can be easily installed is used. For example, a thin hole is excavated in the depth direction of the soft ground 74 adjacent to the subsidence portion. The ejector 62 can be reduced in size according to the size of the hole and installed in the hole for soft ground improvement processing. When the treated water suction port 66 of the ejector 62 is lower than the height of the sinked foundation board 75, the siphon effect by the treated water can be used, so that the siphon effect is added to the suction capability of the ejector. As a result, the ability to suck in treated water (drainage from the ground) can be further improved. Moreover, it is possible to avoid the ejector being filled with the embankment. In the case of a vacuum pump, a water trap, a drainage pump, etc. are usually required, and an increase in the size of the apparatus is inevitable, so such installation is difficult.

  In the example as shown in FIG. 11, it is desirable that the treated water pipe 64 is filled with water in order to effectively operate the siphon effect. For example, when a gas such as oxygen dissolved in the waste water from the ground is mixed in the treated water pipe 64 by the vacuum suction process, the valve 69 is closed while the ejector 62 is driven, and the driving water is made to flow backward. The water pipe 64 can be filled with water. Moreover, this backflow can also be performed intermittently.

  In the vacuum suction processing method according to the present embodiment, for example, as shown in FIG. 12, at least one drain member 60 is installed in the substantially horizontal direction of the embankment-like soft ground 74 to perform soft ground improvement processing. Can do. Since the ejector that can be reduced in size and can be easily installed is used, the ejector 62 can be installed in a narrow place such as a slope (slope) or the vicinity of the embankment-like ground. As a result, it is possible to perform a construction in which the embankment is further raised while performing the vacuum suction process. When the height of the treated water suction port 66 of the ejector 62 is lower than the maximum height of the treated water pipe 64 connected to the drain material 60, the siphon effect by the treated water is used as in the example of FIG. You can also In the case of a vacuum pump, a water trap, a drainage pump, etc. are usually required, and an increase in the size of the apparatus is inevitable, so such installation is difficult.

  In the vacuum suction processing method according to the present embodiment, for example, as shown in FIG. 13, at least one drain member 60 is installed in a substantially vertical direction of a soft ground 74 of a water bottom such as a seabed, a lake bottom, or a pond bottom. Ground improvement processing can be performed. Since an ejector that can be reduced in size and can be easily installed is used, the ejector 62 can be installed on the bottom of the sea such as the seabed, the lake bottom, or the pond bottom. As a result, it is possible to avoid a loss corresponding to the difference in height due to the water depth from the pumped height due to the vacuum. The treated water and the driving water may be discharged as they are to the water source or may be pumped up by a high-pressure jet by the ejector 62. When the water depth is deep, in order to avoid the influence of water pressure, it is better to pump the treated water and the driving water and discharge them on the water surface as shown in FIG. In the case of 3 MPa driving water, theoretically 300 m of water can be pumped. When the height required for pumping up treated water and driving water is large, a plurality of ejectors may be connected in series to form a multistage configuration. In the example of FIG. 13, a gas such as driving water or air may be supplied to the ejector 62 from a moving body such as a ship 80 on the water surface 78. In the case of a vacuum pump, a water trap, a drainage pump, etc. are usually required, and an increase in the size of the apparatus is inevitable, so such installation is difficult. In addition, the vacuum pump is normally at a vacuum degree of about -0.05 MPa to -0.08 MPa, and there is a loss of a degree of vacuum of about -0.05 MPa due to subsidence of 5 m. Usage is difficult. In the example of FIG. 13, the ejector 62 may be installed on a moving body such as the ship 80 on the water surface 78 as necessary.

  In this way, by using an ejector that can be downsized and has a simple structure, a short time to vacuum, a high vacuum with a high degree of vacuum, a high displacement, and pumping by a high-pressure jet. The installation location of the ejector can be appropriately selected according to the situation.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail more concretely, this invention is not limited to a following example.

<Example 1>
Using the muddy water treatment system shown in FIG. 1, muddy water treatment and sludge vacuum dehydration solidification treatment were confirmed. The experimental conditions are as follows.

[Experimental conditions]
Vibrating screen opening: 0.125 mm
Ejector: ID 32mm, length 1m
Ejector drive water volume: 30 L / min
Ejector drive pressure: 4 MPa
Filtration panel: 4 units (40 m ² each)
Filter media opening: approx. 50 μm

The experimental results were as follows.
Negative pressure generated by ejector: -0.098 MPa
Displacement by ejector: 1,000 L / min
Time to reach vacuum: 2 to 3 seconds Filtration water volume: 3 L / min to 10 L / min (180 L / hr to 600 L / hr) per 1 m ^{2 of} filtration membrane area
Amount of dehydrated cake per 4 units (silt / viscosity): 1 ton / hr (30 minutes per cycle, 1 cm cake deposit per cycle)

  In this way, by using an ejector that has a simple configuration, a short time to vacuum, a high degree of vacuum, and vacuum suction with a high displacement, turbid water treatment and sludge vacuum dehydration solidification treatment can be performed in a short treatment time. It was confirmed that it was possible.

  1, 2 Turbid water treatment system, 3 Soft ground improvement treatment system, 10 Dehydrator, 12, 62 Ejector, 14 Turbid water tank, 20 Filtration panel, 21 Filtration cylinder, 22 Frame body, 24 Panel body, 25 Hollow body, 26, 27 Filter medium, 28 Upper air chamber, 30 Lower air chamber, 32 Spacing member, 34 Upper pipe, 36 Lower pipe, 38 Wire, 40, 72 Air inlet, 42, 66 Air inlet, 44, 70 Drive water piping, 46, 48 , 64, 68 Treated water piping, 47, 49, 56, 65, 67, 69 Valve, 50 Main pipe, 52 Nozzle, 54 Cavityless tube, 60 Drain material, 74 Soft ground, 75 Subsidence base, 76 Filling, 78 Water surface, 80 ships.

Claims (6)

By using an ejector for vacuum suction by generating a negative pressure by driving water, a vacuum suction processing method for performing turbid water treatment or sludge dewatering solidification treatment,
By vacuum suction using the ejector connected to the filter medium immersed in the water to be treated containing the suspended substance, a negative pressure is formed inside the filter medium, and the suspended substance is applied to the surface of the filter medium. Including a vacuum suction process to attach,
A separation step of separating the suspended substance adhering to the surface of the filter medium by causing the drive water to flow backward by closing the flow path on the discharge side of the ejector; and
A reverse cleaning step of backwashing the filter medium by backflowing the driving water by closing the discharge-side flow path of the ejector;
A vacuum suction processing method comprising at least one of the above . The vacuum suction processing method according to claim 1 ,
A vacuum suction method according to claim 1, wherein the filter medium has a cylindrical shape when swelled. A vacuum suction processing method for performing soft ground improvement processing by using an ejector that generates a negative pressure by driving water and performs vacuum suction,
Installing a drain material on the soft ground to be improved, and vacuum suction using the ejector connected to the drain material to perform a soft ground improvement process ;
A backflow step of backflowing the drive water by closing the flow path on the discharge side of the ejector;
A vacuum suction processing method comprising: An ejector that generates a negative pressure by driving water and sucks the vacuum;
By vacuum suction with the ejector, and processing means for performing a turbid water treatment or sludge dewatering solidification treatment,
Equipped with a,
The treatment means is a filter medium;
By vacuum suction using the ejector connected to the filter medium immersed in the water to be treated containing the suspended substance, a negative pressure is formed inside the filter medium, and the suspended substance is formed on the surface of the filter medium. To make muddy water treatment or sludge dehydration solidification treatment,
Further, a reverse flow means for closing the flow path on the discharge side of the ejector to cause the driving water to flow backward to separate the suspended matter adhering to the surface of the filter medium, or to reverse-clean the filter medium. vacuum processing system characterized Rukoto equipped with. The vacuum suction processing system according to claim 4 ,
A vacuum suction processing system, wherein the filter medium has a cylindrical shape when inflated. An ejector that generates a negative pressure by driving water and sucks the vacuum;
Processing means for performing soft ground improvement processing by vacuum suction using the ejector;
With
The processing means is a drain material;
Said drain member installed in soft ground improvement target by vacuum suction using the ejector connected to the drain member, have rows soft soil improving treatment,
The vacuum suction processing system further comprises a backflow means for backflowing the drive water by closing a flow path on the discharge side of the ejector .

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