JP2014085172A - Suspended matter separation device and suspended matter separation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently separate suspended matters from liquid containing the same and thereby curbing an increase in a volume of an object to be disposed of after separation.SOLUTION: A suspended matter separation device 100 comprises: a reception tank 110 capable of receiving suspended matter containing liquid L1; one or a plurality of absorption materials 120 which are made of porous resin, are stored in the reception tank 110 together with the suspended matter containing liquid L1 and absorb the suspended matters in the suspended matter containing liquid L1; circulation means 132 which discharges treated water, the suspended matter containing liquid with the suspended matters removed by the absorption material 120, from a lower side of the reception tank 110 while maintaining a water level inside the reception tank 110; and an aeration section 140 which aerates the suspended matter containing liquid L1 by supplying the suspended matter containing liquid L1 with gas from a lower section of the absorption material 120.

Description

  The present invention relates to a suspension separator and a suspension separation method for separating a suspension contained in a liquid.

  Suspension separators for separating and concentrating suspensions in water are used in various fields. For example, in order to purify raw water (source water) in a water treatment device such as a water treatment device, a sewage treatment device, or an industrial wastewater treatment device, or to remove suspended matters remaining in water sent from an activated sludge treatment device or the like. Therefore, a suspension separator is used to purify water in lakes and ponds.

  Conventional suspension separators include a system that filters a suspension with a filter, a system that filters a suspension with a sheet-shaped sponge (for example, Patent Document 1), and a suspension obtained by adding a flocculant. The method of precipitating is adopted.

JP 2004-358376 A

  However, in a suspension separator that employs a method of filtering suspension with the above filter or a method of filtering suspension with a sheet-shaped sponge, the filter or sponge is likely to be clogged, and the suspension is high. It is difficult to separate the suspension from the water contained in the concentration. It is also difficult to concentrate the filtered suspension to a high concentration and take it out.

  In addition, in a suspension separator that employs a method in which a suspension is precipitated by adding a flocculant, the amount of the agglomerate (precipitate) increases by the amount of the added flocculant, resulting in disposal. There is a problem that the amount of the object (suspension and flocculant) increases.

  Therefore, the present invention provides a suspension separation apparatus and a suspension separation method capable of efficiently separating a suspension from a liquid containing the suspension and preventing an increase in the volume of an object to be disposed of after the separation. The purpose is to provide.

  In order to solve the above problems, the suspension separation device of the present invention includes a first storage tank that can store a suspension-containing liquid that is a liquid containing at least a suspension, and a porous resin. One or more adsorbents that are accommodated in the first storage tank together with the suspension-containing liquid and adsorb the suspension in the suspension-containing liquid, and suspended by the adsorbent while maintaining the water level of the first storage tank. Suspension content by supplying gas to the suspension containing liquid from the lower part of the adsorbent and the flow means for discharging the treated water, which is the suspension containing liquid from which the turbidity has been removed, from the lower side of the first storage tank And a first aeration unit that aerates the liquid.

  The adsorbent has a plurality of holes through which the adsorbent cannot pass, and includes a first partition plate that vertically divides the inner region of the first storage tank. The adsorbent is accommodated above the first partition plate, and the first aeration The part may be housed below the first partition plate.

  Moreover, it is good also as providing the suction part which makes a suspension remove | desorb from an adsorbent.

  Further, the suspension-containing liquid contains a solid having a particle size larger than that of the suspension, and is provided on the upstream side of the first storage tank, and separates the solid from the suspension-containing liquid. It is good also as providing the pre-processing part which introduce | transduces into the 1st storage tank the suspension containing liquid from which the solid substance was isolate | separated.

  Further, the pretreatment unit is a tank for storing a suspension-containing liquid containing solids, and a second storage tank in which the horizontal cross-sectional area of the internal region gradually increases as it goes vertically upward, and a suspension containing solids When the second aeration unit for supplying gas to the substance-containing liquid and aerating the suspension-containing liquid containing solids and the suspension-containing liquid in the second storage tank reach a predetermined water level , The overflow containing the suspension-containing liquid in the second storage tank overflows the first storage tank, and the movement of the bubbles formed by the gas introduced by the second aeration section to the overflow section The baffle plate to be suppressed, and a sedimentation region that is formed between the baffle plate and the overflow portion and that sediments the solid matter from the suspension-containing liquid containing the solid matter may be included.

  Moreover, it is good also as providing the return part which returns the treated water which the distribution means discharged to the 2nd storage tank.

  Moreover, it is good also as providing the solid removal means which discharges | emits the solid accumulated in the 2nd storage tank out of the 2nd storage tank.

  In order to solve the above-mentioned problem, another suspension separator of the present invention includes a storage tank that can store an ion-containing liquid that is a liquid containing ions that become insoluble and become a suspension when oxidized. The suspension was removed by the adsorbent while maintaining the water level of one or more adsorbents that are composed of a porous resin and are accommodated in the storage tank together with the ion-containing liquid and adsorb the suspension. Distributing means for discharging treated water, which is an ion-containing liquid, from the lower side of the storage tank, and an aeration unit for supplying an oxidizing gas to the ion-containing liquid stored in the storage tank to aerate the ion-containing liquid. It is characterized by that.

  Further, the ion may be a divalent iron ion. Moreover, it is good also as providing the suction part which makes a suspension remove | desorb from an adsorbent.

  In order to solve the above problems, the suspension separation method of the present invention is a suspension separation method using a storage tank containing one or more adsorbents composed of a porous resin, and is at least a suspension. Suspension-containing liquid, which is a liquid containing turbidity, is introduced from the upper side of the storage tank, and the suspension-containing liquid is circulated through the adsorbent and gas is supplied to the suspension-containing liquid from below the adsorbent. Then, after the suspension-containing liquid is aerated, the suspension is adsorbed on the adsorbent, and then discharged from the lower side of the storage tank.

  In order to solve the above problems, another suspension separation method of the present invention is a suspension separation method using a storage tank containing one or more adsorbents composed of a porous resin, An ion-containing liquid, which is a liquid containing ions that become insoluble and become suspended when oxidized, is introduced from the upper part of the storage tank, and an oxidizing gas is supplied to the ion-containing liquid from below the adsorbent to supply the ion-containing liquid. And a process of allowing the adsorbent to circulate the ion-containing liquid and adsorbing the suspended matter to the adsorbent, and then discharging the suspension from the lower side of the storage tank.

  Further, the discharging step may further include a step of desorbing the suspension from the adsorbent.

  Moreover, it is good also as including the process of stirring the adsorbent which adsorb | sucked the suspension before the process to desorb | desorb or in parallel with the process to desorb.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to isolate | separate a suspension efficiently from the liquid containing a suspension, and to prevent the increase in the capacity | capacitance of the target object discarded after isolation | separation.

It is a figure for demonstrating the specific structure of the suspension separator concerning 1st Embodiment. It is a flowchart for demonstrating the flow of a process of the suspension material separation method concerning 1st Embodiment. It is a figure for demonstrating the specific structure of the suspension separator concerning 2nd Embodiment. It is a flowchart for demonstrating the flow of a process of the suspension material separation method concerning 2nd Embodiment. It is a figure for demonstrating the example of application of the suspension separator concerning 2nd Embodiment. It is a figure for demonstrating the material balance of sand and silt. It is a figure for demonstrating the specific structure of the suspension separator concerning 3rd Embodiment. It is a flowchart for demonstrating the flow of a process of the suspension separation method concerning 3rd Embodiment. It is a figure for demonstrating the other example of a suction part.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(First embodiment)
In recent years, sediments contaminated with radioactive materials have flowed out of rivers to the sea, and the ocean has been contaminated with radioactive materials (Source: Radioactive concentration of cesium in rivers, lakes, and ocean bottoms http) : //maps.google.com/maps/ms? ie = UTF8 & oe = UTF8 & msa = 0 & msid = 207725453018848365813.0004a4db9ecb2c021f36b). It has been shown that when radioactive materials flow into the sea, they have a negative impact on marine life (Source: Avery, SV (1996) Fate of caesium in the environment: Distribution between the abiotic and biotic components of aquatic and terrestrial ecosystems. Environ. Radioactivity Vol.30: 139-171.), Prevention of sediment discharge from river to sea is desired.

The inventors of the present application have detected that a large amount of radioactive material is adsorbed by suspensions suspended in water (primarily silt with a small particle diameter, which is defined as 75 μm or less in JIS) among sediments in rivers. did. For example, Cs137 per dry weight of sediment in the middle of river (bottom mud, mainly sand), Cs137 per dry weight of suspension in river water (mainly silt), and Cs137 of river water were measured. However, as shown in Table 1 below, assuming that the concentration of Cs137 in the sediment was 1, Cs137 having a concentration 79 times that of the sediment was detected in the suspension. Moreover, Cs137 was not detected in river water.

  Therefore, it can be understood that the outflow of radioactive material (for example, Cs137) from the river to the sea can be prevented by removing suspended solids in the river. As a technique to prevent the suspension from flowing from the river to the sea, a silt fence is installed to cross the river, and sediment (suspension and sand) is dammed up upstream of the silt fence to cause sedimentation. The technology to pump up the earth and sand with a pump etc. can be considered.

  However, when pumping up, not only the earth and sand but also a large amount of water (river water) is pumped up, so the tank for storing the mixture of the earth and sand pumped up becomes huge. Therefore, it is conceivable to place a filter at the pump discharge destination, capture only the earth and sand with the filter (trap), and return the water to the river. However, as described above, since sand and silt having a particle diameter smaller than that of sand are mixed in the earth and sand, the silt cannot be captured if a filter having a diameter capable of capturing the sand is used. On the other hand, if a filter having a diameter that can capture silt is used, the filter is quickly clogged.

  In addition, it is possible to add a flocculant to the pumped-up mixture of sediment and water to precipitate the sediment, but the problem that the tank for storing the mixture becomes huge cannot be solved, and the added flocculant The amount of aggregates (precipitates) increases by this amount. Furthermore, not only the suspended matter that is the source of contamination, but also sand that has little effect even if returned to the river is precipitated, resulting in an increase in the amount of objects to be disposed of.

  Therefore, in the present embodiment, a suspension separation apparatus that can efficiently separate a suspension from a liquid containing the suspension and prevent an increase in the volume of an object to be disposed after separation will be described.

(Suspension separator 100)
FIG. 1 is a diagram for explaining a specific configuration of the suspension separator 100 according to the first embodiment. As shown in FIG. 1, the suspension separator 100 includes a storage tank (first storage tank) 110, a partition plate (first partition plate) 112, an adsorbent 120, an introduction unit 130, and a circulation means 132. And an aeration unit (first aeration unit) 140, a suction unit 150, and a stirring unit 160. The suspension separator 100 according to the present embodiment has a normal operation in which the suspension is adsorbed on the adsorbent 120 to purify the suspension-containing liquid L1, and a maintenance in which the suspension adsorbed on the adsorbent 120 is desorbed. The aeration unit 140 is driven during normal operation, and the suction unit 150 and the stirring unit 160 are driven during maintenance operation.

  The storage tank 110 is a tank that can store a suspension-containing liquid L1 that is a liquid containing at least a suspension SS (Suspended Solids). In addition, a partition plate 112 that partitions the inner region of the storage tank 110 vertically (in the Z-axis direction in FIG. 1) is provided in the storage tank 110. The partition plate 112 is provided with a plurality of holes 112a through which the adsorbent 120 described later cannot pass, specifically, a plurality of holes 112a smaller than the diameter of the adsorbent 120 and larger than the diameter of the suspension. By accommodating the adsorbent 120 above 112, it is possible to prevent the adsorbent 120 from flowing out below the partition plate 112. Hereinafter, of the internal region of the storage tank 110, the region above the partition plate 112 is referred to as an upper region, and the region below the partition plate 112 is referred to as a lower region.

  The adsorbent 120 is a sponge made of a porous resin (for example, polyurethane foam), and adsorbs the suspension in the suspension-containing liquid L1. The shape of the adsorbent 120 is, for example, a cube having a side of about 15 mm to 25 mm. By making the shape of the adsorbent 120 a size such as a cube having a side of about 15 mm to 25 mm, the adsorbent 120 can be prevented from being clogged into the hole 112a of the partition plate 112, and handling is easy. In addition, it is possible to avoid a situation where the specific surface area for adsorbing the suspension becomes too small. In FIG. 1, the adsorbent 120 and the holes 112 a are shown larger than the storage tank 110 for easy understanding.

  The present inventors have found that a porous resin having pores having a pore diameter of 200 μm to 800 μm efficiently adsorbs a suspension of about 10 μm to 300 μm. Therefore, in this embodiment, as the adsorbent 120, A porous resin having pores with a pore diameter of 200 μm to 800 μm (for example, 500 μm) is used as the adsorbent 120. The adsorbent 120 is preferably an open-cell porous resin. By adopting an open-cell porous resin, the adsorbability of the suspended matter by the adsorbent 120 can be improved.

  The introduction unit 130 pumps the suspension-containing liquid L1 from a suspension-containing liquid L1 source such as a river, and introduces the suspension-containing liquid L1 to the upper side of the storage tank 110. More specifically, the introduction unit 130 includes an introduction pipe 130a routed from the suspension-containing liquid L1 source to the storage tank 110, and a pump 130b provided in the introduction pipe 130a. By driving, the suspension-containing liquid L1 is pumped out from the suspension-containing liquid L1 source, and the suspension-containing liquid L1 is introduced to the upper side of the storage tank 110.

  The circulation means 132 discharges treated water (purified water), which is a suspension-containing liquid from which the suspended matter has been removed by the adsorbent 120, from the lower side of the storage tank 110 while maintaining the water level of the storage tank 110. By doing so, a liquid flow (downflow) directed vertically downward (in the positive direction of the Z axis in FIG. 1) is formed in the storage tank 110. Specifically, in the present embodiment, the circulation means 132 is configured to include a drawing pipe 134 and a discharge pipe 136.

  The extension pipe 134 is a pipe having one end 134 a connected to the lower side of the storage tank 110, extending vertically upward outside the storage tank 110, and the other end 134 b being opened. The extension pipe 134 is connected to a discharge pipe 136 that is folded vertically downward. When the suspension-containing liquid L1 is continuously introduced into the storage tank 110 by the introduction unit 130, the suspension pipe 110 is suspended in the storage tank 110. In the state where the water level of the substance-containing liquid L1 is maintained at a height substantially equal to the lower end LE of the discharge pipe 136 at the connection position between the extension pipe 134 and the discharge pipe 136, the liquid (treatment) Water) will be discharged. That is, the suspension-containing liquid L1 introduced from the introduction unit 130 to the upper side of the storage tank 110 flows vertically downward (in the positive direction of the Z axis in FIG. 1) in the storage tank 110.

  The suspension-containing liquid L1 is exposed to the adsorbent 120 in the upper region while flowing vertically downward in the storage tank 110, and the suspension is adsorbed on the adsorbent 120, thereby hanging the suspension-containing liquid L1. The suspension is removed from the turbid material-containing liquid L1. Therefore, the treated water from which the suspension is removed from the suspension-containing liquid L1 is discharged through the extension pipe 134 and the discharge pipe 136.

  Further, in the present embodiment, a diffuser 142 that constitutes the aeration unit 140 is disposed below the partition plate 112 (lower region) in the storage tank 110. The aeration unit 140 includes, for example, an aeration unit 142 composed of an aeration tube or an aeration plate having a hole diameter of about 300 μm, and a blower 144 for sending gas to the aeration unit 142. To supply a gas (for example, air) to the suspension-containing liquid L1 to aerate the suspension-containing liquid L1. Needless to say, bubbles formed by the gas supplied from the aeration unit 140 pass through the holes 112 a of the partition plate 112.

  With the configuration including the aeration unit 140, the suspension-containing liquid L1 and the adsorbent 120 can be easily contacted in the upper region. Therefore, the suspension adsorbing efficiency of the adsorbent 120 can be improved.

  Further, when the gas is aerated by the aeration unit 140, the suspended matter moves (floats) vertically upward along with the rising of the bubbles in the suspended liquid L1. On the other hand, the circulation means 132 discharges the suspension-containing liquid L1 vertically downward. Here, by adjusting the amount of gas to be aerated and the introduction amount of the suspension-containing liquid L1, the suspension in the storage tank 110 is avoided while avoiding the situation that the suspended suspension is mixed into the treated water. It becomes possible to increase the residence time of the suspended matter.

  The suction unit 150 desorbs (desorbs) the suspension from the adsorbent 120 during the maintenance operation. More specifically, the suction unit 150 includes a suction pipe 152 branched from the upstream side of the connection position of the discharge pipe 136 in the extension pipe 134 and a pump 154 provided in the suction pipe 152. , The liquid containing the adsorbent 120 is sucked, and the suspended matter is desorbed from the adsorbent 120.

  By doing so, the suspension adsorbed by the adsorbent 120 in the storage tank 110 can be desorbed from the adsorbent 120, and the suspension adsorbing ability of the adsorbent 120 can be regenerated. The suspension-containing liquid L2 discharged from the suction tube 152 is concentrated more than the suspension-containing liquid L1 introduced into the storage tank 110 by the introduction unit 130. That is, the concentration of the suspension of the suspension-containing liquid L2 discharged from the suction pipe 152 is higher than the concentration of the suspension of the suspension-containing liquid L1 introduced into the storage tank 110. Can be removed in a concentrated state.

  The agitating unit 160 is configured to include an aeration unit 162 composed of an aeration tube or a diffusion plate and a blower 164 for sending gas to the aeration unit 162 during maintenance operation. A gas (for example, air) is supplied to the bottom of the adsorbent 120 to stir the adsorbent 120. The bubble diameter of the gas supplied from the aeration unit 162 of the stirring unit 160 is larger than the bubble diameter of the gas supplied from the diffusion unit 142 of the aeration unit 140. In addition, by configuring the air diffuser 162 of the stirring unit 160 with a simple tube, bubbles having a larger diameter can be introduced. The timing of desorption of the suspension from the adsorbent 120 by the suction unit 150 and the timing of the stirring of the adsorbent 120 by the stirring unit 160 will be described in detail later.

  As described above, according to the suspension separator 100 according to the present embodiment, the suspension-containing liquid L1 has a simple configuration in which only the suspension-containing liquid L1 is circulated (contacted) to the adsorbent 120. The suspension can be separated efficiently from Therefore, the suspension can be continuously removed from the suspension-containing liquid L1.

  In addition, since only the suspension can be separated without introducing a substance different from the suspension such as a flocculant, it is possible to prevent an increase in the volume of the object to be disposed of after the separation.

  Moreover, the partition plate 112 is provided, and the adsorbent 120 is arranged in the upper region and the diffuser 142 is arranged in the lower region, whereby the hole (gas outlet) of the diffuser 142 is blocked by the adsorbent 120. It is possible to avoid a situation where the efficiency of aeration is reduced. Further, it is possible to prevent the suction unit 150 from sucking the adsorbent 120 during the maintenance operation.

  Furthermore, in the suspension separation device 100 of the present embodiment, the adsorbent 120 is not spread over the entire surface of the partition plate 112, but the upper region is filled with the block adsorbent 120 in a flowable manner. It is possible to prevent the adsorbent 120 from being clogged by the suspension.

(Suspension separation method)
Next, a suspension separation method using the suspension separator 100 will be described. FIG. 2 is a flowchart for explaining a processing flow of the suspension separation method according to the first embodiment. As shown in FIG. 2, the suspension separation method according to the present embodiment includes an adsorption process step S110 (normal operation), a determination process step S120 (normal operation), an agitation process step S130 (maintenance operation), and a desorption process step S140. When each process of (maintenance operation) is performed and the process of the desorption process step S140 is completed, the process is repeated from the process of the adsorption process step S110. Hereinafter, each step in the suspension separation method will be described.

(Adsorption process step S110)
In the adsorption step S <b> 110, the introduction unit 130 introduces the suspension-containing liquid L <b> 1 from the upper side of the storage tank 110 containing the adsorbent 120, and distributes (contacts) the suspension-containing liquid L <b> 1 to the adsorbent 120. At the same time, the aeration unit 140 supplies gas from below the adsorbent 120 to the suspension-containing liquid L1 to aerate the suspension-containing liquid L1, thereby allowing the adsorbent 120 to adsorb the suspension and then storing the adsorbent 120. In this step, the treated water is discharged from the lower side of the tank 110 through the extension pipe 134 and the discharge pipe 136.

  By performing the process of the adsorption step S110, the suspension can be adsorbed while circulating the suspension-containing liquid L1 through the adsorbent 120, and the suspension is continuously extracted from the suspension-containing liquid L1. Can be removed.

(Judgment process step S120)
The determination step S120 is a step of determining whether or not the concentration of the suspension in the treated water discharged from the discharge pipe 136 is equal to or higher than a predetermined value D. Here, the value D is the maximum value of the concentration of the suspension that is acceptable in the treated water. And when it determines with the density | concentration of the suspension in the treated water discharged | emitted from the discharge pipe 136 being less than the value D (NO in step S120), the process from the said adsorption | suction process step S110 is repeated, from the discharge pipe 136, If it determines with the density | concentration of the suspension in the discharged | emitted process water being more than the value D (YES in step S120), a process will be moved to the following stirring process step S130. In addition, if driving experience is accumulated, determination process step S120 may be abbreviate | omitted and it may transfer to stirring process step S130 after a fixed time.

(Stirring step S130)
In the determination step S120, when it is determined that the concentration of the suspension in the treated water discharged from the discharge pipe 136 is equal to or higher than the value D, the pump 130b is stopped and the storage tank 110 by the introduction unit 130 is stopped. The suspension-containing liquid L1 is stopped from being introduced. As described above, the extension pipe 134 is a pipe in which one end 134a is connected to the lower side of the storage tank 110, extends vertically upward outside the storage tank 110, and the other end 134b is opened. When the introduction of the suspension-containing liquid L1 into the storage tank 110 by 130 is stopped, the water level of the suspension-containing liquid L1 in the storage tank 110 is changed to the discharge pipe 136 at the connection position between the extension pipe 134 and the discharge pipe 136. The discharge of the treated water through the drawing pipe 134 and the discharge pipe 136 is stopped in a state where the height is maintained at substantially the same height as the lower end LE.

  And the blower 164 which comprises the stirring part 160 is driven, and the adsorbent 120 is stirred by supplying gas from the aeration part 162 to the suspension liquid L1 accommodated in the upper area | region of the storage tank 110. . The agitation unit 160 agitates the adsorbent 120, thereby reducing the binding force of adsorption between the adsorbent 120 and the suspended matter performed in the adsorption step S110.

(Desorption process step S140)
Subsequently, the adsorbent 120 is sucked by driving the pump 154 constituting the suction unit 150 and sucking the suspension-containing liquid L2 stored in the storage tank 110. Then, the suspension adsorbed on the adsorbent 120 is desorbed, and the concentrated suspension-containing liquid L2 is discharged from the suction pipe 152.

  As described above, according to the suspension separation method according to the present embodiment, the suspension can be efficiently separated from the suspension-containing liquid L1, and the increase in the volume of the object to be disposed of after separation can be prevented. It becomes possible.

Example 1
The suspension-containing liquid L1 containing bentonite as a suspension was processed by the suspension separator 100. Here, a cylindrical storage tank 110 having a diameter of 155 mmφ and 5 L was used as the storage tank 110, and a cubic polyurethane foam (a pore diameter of about 500 μm) having a side of about 25 mm was used as the adsorbent 120. Further, the flow rate of the suspension-containing liquid L1 is set to 730 mL / min, and the aeration unit 140 is not driven until 13 minutes have elapsed from the start of introduction, and the aeration unit 140 is driven for 5 minutes after the elapse of 13 minutes. The suspension-containing liquid L1 was aerated. Suspension-containing liquid L1 introduced into the storage tank 110 (referred to as “introduced water”), treated water discharged through the discharge pipe 136 through the adsorbent 120 without aeration (referred to as “no aeration”), adsorbent The treated water (referred to as “aerated”) discharged from the discharge pipe 136 by aeration while circulating 120 was measured, and the concentration of each suspension was measured.

  As a result, as shown in Table 2 above, the concentration of the suspension in the introduced water was 389 mg / L, and the concentration of the suspension in the treated water without aeration was 227 mg / L. That is, it was found that the adsorbent 120 can adsorb and remove 42% of the suspension when aeration is not performed. In addition, the concentration of the suspension in the treated water when aeration was present was 85 mg / L. That is, it was found that when aeration is performed, the adsorbent 120 can adsorb and remove 78% of the suspended matter. Thus, it was found that the absorptive ability of the suspension by the adsorbent 120 is significantly improved by aeration.

(Example 2)
The suspension-containing liquid L1 containing bentonite as a suspension was processed by the suspension separator 100. Here, a cylindrical storage tank 110 having a diameter of 155 mmφ and 5 L was used as the storage tank 110, and a cubic polyurethane foam (a pore diameter of about 500 μm) having a side of about 25 mm was used as the adsorbent 120. Further, the flow rate of the suspension-containing liquid L1 was set to 500 mL / min, and the aeration unit 140 was driven after starting the introduction to aerate the suspension-containing liquid L1. Further, 10 ppm of a flocculant (PAC: polyaluminum chloride) was added to the treated water discharged from the discharge pipe 136 to precipitate (aggregate) the suspension contained in the treated water.

Suspension-containing liquid L1 introduced into the storage tank 110 (referred to as “introduced water”), treated water circulated through the adsorbent 120 and aerated and discharged from the discharge pipe 136 (referred to as “aerated”), treatment The supernatant (referred to as “after adding flocculant”) from which the flocculant was added to water to remove the flocculant (precipitate) and the concentration of each suspension were measured.

  As a result, as shown in Table 3 above, the concentration of the suspension in the introduced water was 1960 mg / L, the concentration of the suspension in the treated water when aerated was 177 mg / L, and the adsorbent 120 was It was found that 91% suspension could be adsorbed and removed. Moreover, when compared with the result of Example 1, when the concentration of the suspension in the introduced water is high, the concentration of the suspension in the treated water is increased, but the removal rate of the suspension is improved. It was.

  Further, when the flocculant is added to the treated water, the concentration of the suspension in the supernatant is 37 mg / L, that is, the removal rate of the suspension is 98%. It was found that turbidity could be removed.

(Example 3)
As the storage tank 110, a 5L storage tank 110 was used, and as the adsorbent 120, a cubic polyurethane foam having a side of about 25 mm (pore diameter: about 500 μm) was used. When water containing 30 g of suspension (mainly silt) was circulated in such a storage tank 110, it did not break through in 1 hour, that is, the limit value of the adsorption capacity of the adsorbent 120 was not exceeded, and the treated water The suspension concentration was maintained at 120 mg / L. Thus, it was found that the suspension separator 100 can process the suspension-containing liquid containing the suspension in a high concentration for at least one hour in a normal operation without performing a maintenance operation.

  In addition, as a result of circulating water containing 30 g of suspension (mainly silt) in the storage tank 110 for 1 hour, the suspension-containing liquid in the storage tank 110 contains a suspension of 6000 mg / L. It was. Thereby, it turned out that the suspension separator 100 can concentrate a suspension to a high concentration efficiently from a suspension containing liquid.

  Further, as a maintenance operation, when the suspension-containing liquid in the storage tank 110 is sucked by the suction part 150 without using the stirring part 160, the sucked suspension-containing liquid contains a suspension of 2500 mg / L. However, after the adsorbent 120 and the suspension-containing liquid were stirred by the stirring unit 160 under the same conditions, the suspension-containing liquid in the storage tank 110 was sucked by the suction unit 150. The product-containing solution contained a suspension of 2810 mg / L. As a result, the agitation unit 160 agitates the adsorbent 120 before aspiration by the aspiration unit 150, thereby reducing the binding force of adsorption between the adsorbent 120 and the suspended matter and suspending from the adsorbent 120 more efficiently. It turns out that things can be desorbed.

  Further, the aspirated suspension-containing liquid (concentrated suspension-containing liquid) is allowed to stand overnight, so that the suspension is settled, and the concentration of the suspension in the supernatant is 50 to 80 mg / It turned out that it can reduce to about L. Moreover, it turned out that the moisture content of a sediment can be reduced significantly and a sediment (suspension) can be concentrated to 100-300 dry weight g / wet weight kg. That is, it is understood that the suspension-containing liquid can be further reduced (concentrated) by introducing the concentrated suspension-containing liquid sucked by the suction unit 150 into a sedimentation tank whose residence time is about 16 hours. It was.

(Second Embodiment: Suspension Separation Device 200)
As described above, there is a problem that sediments contaminated with radioactive materials flow out from the river to the sea, and the ocean is contaminated with radioactive materials. Since many radioactive substances are adsorbed by turbid materials, development of a technique for removing suspended matters from river water is desired.

  In the first embodiment described above, although the suspension can be efficiently removed from the suspension-containing liquid, solids such as sand and gravel having a larger particle size than the suspension (hereinafter simply referred to as solids). When the suspension-containing liquid contains a large amount of solids, the solids occupy most of the storage tank 110, which may reduce the ability to remove the suspension. Therefore, by allowing the suspension-containing liquid containing solids to stand, it is possible to settle and separate only solids in a relatively short time. However, when performing sedimentation separation, the solids are mixed together. There is a problem that they are removed together. Therefore, in the second embodiment, a configuration in which only solid matter is removed from the suspension-containing liquid and then the suspension-containing liquid is introduced into the storage tank 110 will be described.

  FIG. 3 is a diagram for explaining a specific configuration of the suspension separator 200 according to the second embodiment. As shown in FIG. 3, the suspension separator 200 includes an introduction unit 202, a pretreatment unit 210, a storage tank (first storage tank) 110, a partition plate (first partition plate) 112, and an adsorbent. 120, a circulation unit 132, an aeration unit (first aeration unit) 140, a suction unit 150, an agitation unit 160, a return unit 250, and a solid matter removal unit 260. Note that the storage tank (first storage tank) 110, the partition plate (first partition plate) 112, the adsorbent 120, the flow means 132, and the aeration unit (first aeration unit) already described as the components in the first embodiment. Since 140, the suction unit 150, and the stirring unit 160 have substantially the same functions, a duplicate description is omitted. Here, the preprocessing unit 210, the return unit 250, and the solid matter removing unit 260 having different configurations will be described in detail. The suspension separator 200 of the present embodiment has a normal operation in which the suspension is adsorbed on the adsorbent 120 to purify the suspension-containing liquid L1, and maintenance in which the suspension adsorbed on the adsorbent 120 is desorbed. The pre-processing unit 210, the aeration unit 140, and the return unit 250 are driven during normal operation, and the suction unit 150, the stirring unit 160, and the solid matter removing unit 260 are driven during maintenance operation.

  The pretreatment unit 210 is provided on the upstream side of the storage tank 110 and separates the solid from the suspension-containing liquid L0 and introduces the suspension-containing liquid L1 from which the solid is separated into the storage tank 110. More specifically, in this embodiment, the pretreatment unit 210 includes a storage tank (second storage tank) 220, a partition plate (second partition plate) 222, an aeration unit (second aeration unit) 224, The flow part 226 and the baffle plate 228 are comprised.

  The storage tank 220 is a tank that stores the suspension-containing liquid L0 containing solids, and the horizontal cross-sectional area of the internal region gradually increases as it goes vertically upward (in the negative direction of the Z axis in FIG. 3). It is. The suspension tank-containing liquid L0 is introduced into the storage tank 220 from the suspension-containing liquid L0 source such as a river by the introduction unit 202. The introduction unit 202 includes an introduction pipe 202a routed from the suspension-containing liquid L0 source to the storage tank 220, and an introduction means 202b provided in the introduction pipe 202a, and drives the introduction means 202b. Thus, the suspension-containing liquid L0 is pumped from the suspension-containing liquid L0 source, and the suspension-containing liquid L0 is introduced into the upper part of the storage tank 220. The introducing means 202b is constituted by, for example, a pump or a dredge device.

  In addition, a partition plate 222 that partitions the inner region of the storage tank 220 vertically (in the Z-axis direction in FIG. 3) is provided in the storage tank 220. The partition plate 222 is provided with a plurality of holes 222a (preferably about several millimeters) as small as possible so that the gas from the aeration unit 224 can be smoothly passed therethrough. Yes. Hereinafter, of the internal region of the storage tank 220, the region above the partition plate 222 is referred to as an upper region, and the region below the partition plate 222 is referred to as a lower region.

  In the present embodiment, an air diffuser 224 a constituting the aeration unit 224 is disposed below the partition plate 222 (lower region) in the storage tank 220. The aeration unit 224 includes, for example, an aeration tube or a diffusion plate having a hole diameter of 300 μm or more, an aeration unit 224a including a simple tube, and a blower 224b that sends gas (for example, air) to the aeration unit 224a. The gas is supplied to the suspension-containing liquid L0 from the bottom surface side in the storage tank 220, and the suspension-containing liquid L0 is aerated. In this way, a liquid flow (upward flow) directed vertically upward (in the negative direction of the Z axis in FIG. 3) is formed in the storage tank 220, and the suspension adsorbed (attached) to the solid matter by aeration. The suspended matter will be dispersed in the liquid.

  The overflow section 226 is a tube formed on the side surface 220a of the storage tank 220. When the suspension-containing liquids L0 and L1 in the storage tank 220 reach a predetermined water level, The suspension-containing liquid L1 is allowed to overflow above the storage tank 110.

  The baffle plate 228 is a plate that is installed with its upper portion inclined toward the side surface 220 b facing the side surface 220 a of the storage tank 220 and its lower portion inclined toward the side surface 220 a (overflow portion 226), and is introduced by the aeration unit 224. The movement of bubbles formed by the gas to the overflow portion 226 is suppressed. The baffle plate 228 is provided across the liquid level of the suspension-containing liquid L0 in the storage tank 220, and the horizontal position of the baffle plate 228 is biased toward the overflow portion 226. In the present embodiment, the baffle plate 228 is positioned between the overflow portion 226 and the end portion 222b of the partition plate 222 on the overflow portion 226 (side surface 220a) side in the horizontal direction. More specifically, the baffle plate 228 is arranged such that, in the horizontal direction, the tangent line between the vertically lower surface 228a of the baffle plate 228 and the liquid surface has an end portion 222b on the overflow portion 226 side of the partition plate 222 and the overflow portion 226. It is arranged to be located between.

  By arranging the baffle plate 228 as described above in the storage tank 220 which is a tank in which the horizontal cross-sectional area of the inner region gradually increases as it goes vertically upward, the baffle plate of bubbles aerated from the bottom surface side of the storage tank 220 Mixing into the sedimentation region formed between 228 and the overflow portion 226 can be prevented. Therefore, in the region formed between the baffle plate 228 and the side surface 220b, the suspension-containing liquid L0 is agitated by aeration by the aeration unit 224, and the adsorption of the suspension to the solid is released. In the sedimentation region, the solid matter is settled using the difference in sedimentation speed (falling speed) between the solid matter and the suspension, and the solid matter is separated from the suspension-containing liquid L0.

  Thus, the solid matter remains in the storage tank 220, and the suspension-containing liquid L1 from which the solid matter has been separated is introduced into the storage tank 110 from the overflow section 226.

  The particle size of the particles remaining in the storage tank 220 can be adjusted by adjusting the vertical position (depth from the liquid surface) of the baffle plate 228. Specifically, as the vertical position of the baffle plate 228 is deepened vertically downward from the liquid level, the minimum particle size of the remaining particles can be reduced, that is, the suspension that overflows from the overflow section 226. The particle size of the turbid material can be reduced.

  The return unit 250 returns the treated water discharged from the discharge pipe 136 constituting the circulation unit 132 to the storage tank 220. More specifically, the return unit 250 includes a storage tank 252 that stores treated water discharged from the discharge pipe 136 that constitutes the circulation means 132, one end connected to the storage tank 252, and the other end of the storage tank 220. A return pipe 254 connected to the bottom surface and a pump 256 provided on the return pipe 254 are configured.

  The concentration of the solid in the suspension-containing liquid L0 is high, that is, the concentration of the liquid is low, and the suspension is not sufficiently dispersed in the liquid. When separation is difficult, the return unit 250 returns the treated water to the storage tank 220, so that the concentration of solids in the storage tank 220 can be lowered, and separation of solids and suspensions is facilitated. It becomes possible to do.

  In addition, the particle diameter of the particle which overflows from the overflow part 226 can be adjusted by adjusting the delivery flow rate of the treated water by the pump 256. More specifically, the smaller the flow rate of the treated water delivered by the pump 256, the smaller the particle size of the suspension that overflows from the overflow section 226, that is, the smaller the minimum particle size of the remaining particles. can do.

  The solid matter removing means 260 is constituted by a grab type sanding machine, a bucket conveyor or the like, and takes out the solid matter settled and separated from the suspension-containing liquid L0 in the storage tank 220 to the outside. As described above, the amount of radioactive material adsorbed on the solid matter is extremely small compared to the suspension (see Table 1). Therefore, when the amount of the radioactive material adsorbed on the solid matter is such that there is no influence even if it is returned to the river, the solid matter removing means 260 is provided. Can be separated.

  As described above, according to the suspension separation device 200 according to the present embodiment, the pretreatment unit 210 separates the solid matter with a small amount of radioactive material adsorbed from the suspension-containing liquid L0, and the solid matter is separated. Since the separated suspension-containing liquid L1 is circulated (contacted) to the adsorbent 120, the suspension-removing ability in the storage tank 110 is avoided from being lowered and efficiently from the suspension-containing liquid L1. The suspension can be separated.

  In addition, due to the configuration in which the partition plate 222 is provided in the storage tank 220, the hole (gas outlet / outlet) of the air diffuser 224a and the outlet of the return pipe 254 are blocked by solids, resulting in a reduction in aeration efficiency. Can be avoided.

(Suspension separation method)
Subsequently, a suspension separation method using the suspension separation apparatus 200 will be described. FIG. 4 is a flowchart for explaining the processing flow of the suspension separation method according to the second embodiment. As shown in FIG. 4, the suspension separation method according to the present embodiment includes an adsorption process step S210 (normal operation), a determination process step S120 (normal operation), an agitation process step S230 (maintenance operation), and a desorption process step S140. (Maintenance operation) and removal process step S250 (maintenance operation) are performed, and when the process of removal process step S250 is completed, the process of adsorption process step S210 is repeated. Hereinafter, although each process in the suspension separation method will be described, the determination process step S120 and the desorption process step S140 are substantially the same as the determination process step S120 and the desorption process step S140 of the first embodiment described above. For this reason, the same reference numerals are assigned and redundant description is omitted, and here, the adsorption process step S210, the stirring process step S230, and the removal process step S250, which are different in processing, will be described in detail.

(Adsorption process step S210)
First, the introduction unit 202 introduces the suspension-containing liquid L0 into the storage tank 220, and the aeration unit 224 aerates the suspension-containing liquid L0, whereby the suspension-containing liquid L0 is stirred and suspended. The adsorption of the solids and the suspension in the substance-containing liquid L0 is released, and the solids are settled and separated from the suspension-containing liquid L0 in the sedimentation region of the storage tank 220. And the suspension containing liquid L1 from which the solid substance was removed from the suspension containing liquid L0 is introduce | transduced into the upper part side of the storage tank 110 which accommodated the adsorbent 120 from the overflow part 226. FIG.

  Then, in the storage tank 110, the suspension-containing liquid L1 is circulated (contacted) to the adsorbent 120, and the aeration unit 140 supplies gas to the suspension-containing liquid L1 from below the adsorbent 120, thereby suspending the suspension. After the suspension liquid is adsorbed by the adsorbent 120 by aeration of the containing liquid L <b> 1, the treated water is discharged from the lower side of the storage tank 110 to the storage tank 252 through the extension pipe 134 and the discharge pipe 136.

  When the concentration of solid matter is high in the storage tank 220, the pump 256 is driven to return the treated water stored in the storage tank 252 to the storage tank 220.

(Stirring step S230)
In the determination step S120, when it is determined that the concentration of the suspension in the treated water discharged from the discharge pipe 136 is equal to or higher than the value D, the driving of the introduction unit 202b is stopped, and the storage tank by the introduction unit 202 The introduction of the suspension-containing liquid L0 into 220 is stopped. Accordingly, introduction of the suspension-containing liquid L1 into the storage tank 110 through the overflow section 226 is stopped. As described above, the extension pipe 134 has one end 134a connected to the lower side of the storage tank 110, extends vertically upward outside the storage tank 110, and is open at the other end 134b. When the introduction of the suspension-containing liquid L1 from the section 226 to the storage tank 110 is stopped, the water level of the suspension-containing liquid L1 in the storage tank 110 is changed to the discharge pipe at the connection position between the extension pipe 134 and the discharge pipe 136. The discharge of the treated water through the drawing pipe 134 and the discharge pipe 136 is stopped in a state where the height is maintained substantially equal to the lower end LE of 136.

  And the blower 164 which comprises the stirring part 160 is driven, and the adsorbent 120 is stirred by supplying gas from the aeration part 162 to the suspension liquid L1 accommodated in the upper area | region of the storage tank 110. . The agitation unit 160 agitates the adsorbent 120, thereby reducing the binding force for adsorbing the adsorbent 120 and the suspension formed in the adsorption step S210.

(Removal step S250)
The solid matter removing means 260 takes out the solid matter settled and separated from the suspension-containing liquid L0 in the storage tank 220 from the storage tank 220 to the outside.

  As described above, according to the suspension separation method according to the present embodiment, in the adsorption step S210, the solid matter with a small amount of radioactive substance adsorbed is separated from the suspension-containing liquid L0, and the solid matter is separated. Since the suspended suspension-containing liquid L1 is circulated (contacted) to the adsorbent 120, the suspension-containing liquid L1 is efficiently suspended from the suspension-containing liquid L1 by avoiding a decrease in the ability to remove the suspension in the storage tank 110. The turbidity can be separated.

(Example 4)
A suspension-containing liquid L0 containing earth and sand composed of about 80% of sand having a particle size of 200 to 300 μm as a solid and about 20% of silt having a particle size of 75 μm or less as a suspension is separated from the suspension. Processed with apparatus 200. Here, as the adsorbent 120, a cubic polyurethane foam having a side of about 25 mm (pore diameter of about 500 μm) was used. Then, when the pump 256 was driven and the treated water was circulated from the storage tank 252 to the storage tank 220 for 1 hour, sand from the storage tank 220 and silt from the storage tank 110 could be recovered.

(Application example)
FIG. 5 is a diagram for explaining an application example of the suspension separator 200 according to the second embodiment. In FIG. 5, rivers and seas are shown in gray, and sediment and suspension (silt) flows are shown by white arrows. For example, the suspension separator 200 is installed on a gantry, and a suspension is provided under the gantry to constitute the suspension separator-equipped ship (floating structure) 300. Then, as shown in FIG. 5, the suspension separator-equipped ship 300 is deployed in the river, and the suspension is removed from the river water in the river.

  More specifically, as shown in the top view shown in FIG. 5A and the side view shown in FIG. 5B, the silt fence 302a crosses the river (here, the estuary), 302b is installed and sediment and silt carried by the river are settled on the upstream side of the silt fences 302a and 302b. In addition, the suspension separator-equipped ship 300 is installed in the vicinity of the silt fences 302a and 302b.

  First, water is introduced into the storage tank 220 and the storage tank 110 of the suspension separator-equipped ship 300, the aeration units 140 and 224 are driven, the pump 256 is driven, and the storage tank 252 to the storage tank 220 is driven. Circulate water. Subsequently, the sediment (shown in black in FIG. 5B) that has precipitated on the upstream side of the silt fences 302a and 302b is introduced into the storage tank 220, and one end of the introduction pipe 202a is placed on the sediment. The introduction means 202b is arranged in the vicinity and the precipitate is introduced into the storage tank 220 by driving the introduction means 202b. Then, the precipitate is stirred in the storage tank 220, sand and the like remain in the storage tank 220, and the suspension-containing liquid L1 containing only silt is concentrated in the storage tank 110, that is, the silt ( The treated water from which the suspended matter) remains and the silt is removed is discharged to the storage tank 252, and the treated water overflows (overflows) from the storage tank 252 and is returned to the river.

  And before the adsorption capacity of the suspension by the adsorbent 120 exceeds the allowable value, the pump 154 is temporarily driven to suck the suspension-containing liquid L2 concentrated in the storage tank 110 to the land. It supplies to the settling tank 310 installed. In the sedimentation tank 310, the suspension-containing liquid L2 is allowed to stand for about one night, whereby the suspension is settled and separated in the suspension-containing liquid L2. The supernatant obtained as a result of sedimentation and separation of the suspension as sediment is returned to the river as it is because the concentration of radioactive material is low.

  On the other hand, since the sediment settled and separated in the sedimentation tank 310 is considered to have a high concentration of radioactive material, it is extracted from the sedimentation tank 310 and then subjected to an appropriate treatment (for example, further concentration) to an appropriate place. store.

  Moreover, since it is thought that the sand etc. which remain | survived in the storage tank 220 adsorb | suck less radioactive material compared with a suspension (refer Table 1), it returns to a river by the solid substance removal means 260. FIG.

  As described above, the silt fences 302a and 302b are installed in the river, and the sediment precipitated on the upstream side of the silt fences 302a and 302b is processed by the suspension separator-equipped ship 300, so that the suspension in the river water It is possible to remove the radioactive material from the river to the sea. Therefore, accumulation of radioactive substances in marine organisms can be reduced.

  Here, the material balance of sand and silt was examined on the assumption that the ship 300 with a suspension separator was installed at the estuary. FIG. 6 is a diagram for explaining the material balance between sand and silt. Of the bottom mud of the river from which the measurement results shown in Table 1 above were obtained, the silt content in the bottom mud with a high silt content was 10 to 20%. The case of treating the bottom mud with the suspension separator-equipped ship 300 was examined.

Suspension-containing water containing 1% of bottom mud (dry weight) containing 15% of silt is transferred to a suspension separator-equipped ship 300 equipped with 5 m ³ of storage tanks 110 and 220, 20 m ³ / The treated water is returned to the storage tank 220 at the same flow rate (that is, 20 m ³ / hour) as the flow rate pumped from the storage tank 252 while being pumped at a flow rate of time (indicated by m ³ / h in FIG. 6). In the storage tank 220, sand and silt can be separated 100%, most of the silt is removed in the storage tank 110, and the concentration of silt in the treated water (dry weight concentration of silt) is 120 dry weight mg / hour. Assume that there is. In FIG. 6, “dry weight” is indicated by “DW”.

  In addition, using the suspension separator 200 provided with the 1.7L storage tank 220 and the 5L storage tank 110, the suspension containing 1% bottom mud (dry weight) containing 15% silt is contained. As a result of supplying water to the suspension separator 200 at a rate of 20 L / hour, sand and silt can be separated almost 100% in the storage tank 220, and the concentration (suspension of the suspension in the treated water discharged from the storage tank 110 is suspended. Since the dry weight concentration of the turbid substance was 120 dry weight mg / L, the material balance of sand and silt was examined using these values.

  Assuming that the amount of radioactive Cs adsorbed on sand (Cs137) into the storage tank 220 per hour is 1, referring to the measured values shown in Table 1 above, the amount of radioactive Cs adsorbed on silt per hour The amount introduced into the storage tank 220 is 79 × (1.5 / 8.5) = 13.9. 92% of the silt introduced into the suspension separator-equipped ship 300 is extracted from the storage tank 110 by the suction unit 150 and stored or disposed of in the sedimentation tank 310. The returned silt is 13.9 × (100−92) /100=1.1.

  Therefore, the radioactive Cs remaining in the river, including the one adsorbed on the sand, is 1 + 1.1 = 2.1, which is the amount of radioactive Cs contained in the bottom mud before being introduced into the suspension separator-equipped ship 300. 86% of 14.9 (sand 1, silt 13.9) will be discharged out of the system (outside the river).

Further, when the suspension separator 200 is operated for 8 hours a day in the suspension separator-equipped ship 300, the processing amount is 20 (m ³ / hour) × 8 (hours) = 160 m ³ / day. Here, in order to purify 1 m ² of bottom mud, if 0.4 m ³ of the suspension-containing liquid L is pumped into the storage tank 220, 160 (m ³ /day)/0.4 (m ³ / m ² ) = 400 m ² / day, the bottom mud can be purified. If the area of the estuary area is 20000 m ² , it will take 50 days to purify 20000 m ² of bottom mud. Further, assuming that the suction pump 154 for sucking the concentrated suspension-containing liquid L2 from the storage tank 110 is driven every hour for 8 hours (that is, 8 times a day), 8 times × 5 m ³ = 40 m ³ sedimentation tank 310 is required, and if the sediment settled and separated overnight in sedimentation tank 310 is 8% of 40 m ³ , the sediment (silt) with a high radioactive substance content (radioactivity level) Will be separated from the river at 3.2 m ³ / day.

As described above, the 20000 m ² estuary area is surrounded by silt fences 302a and 302b, and silt fences 302a and 302b suppress silt outflow from the river to the sea, and the sediment settles on the upstream side of silt fences 302a and 302b. things and by day 8 hours in suspension separation device 200 having a storage tub 110 storage tank 220,5M ³ of 5 m ^3, the radioactive substance adsorbed to silt in rivers quickly such 50 days ( It was found that most of Cs137) can be removed, and the outflow of radioactive material downstream of the silt fences 302a and 302b can be suppressed.

  Further, instead of pumping the bottom mud (precipitate) from the river together with the river water, the bottom mud can be dredged or mud on the river shore can be excavated and introduced into the storage tank 220. In this case, the suspension separation device-equipped ship 300 is not necessarily required. For example, the suspension separation device 200 is installed on a gantry and a wheel or a caterpillar is provided below the gantry, and the suspension separation device-equipped vehicle is installed. The suspension vehicle equipped with the suspension separator is deployed on the shores of rivers.

  However, when dredging the bottom mud or excavating mud on the river shore, the concentration of the bottom mud and mud introduced into the storage tank 220 is high, and the bottom mud (mud) is continuously poured into the storage tank 220. Since it is difficult to introduce, it is preferable to intermittently introduce bottom mud (mud) into the storage tank 220. In this case, when the bottom mud (mud) is introduced into the storage tank 220, the suspension-containing liquid may overflow to the storage tank 110 without sufficiently separating solids in the storage tank 220. Therefore, if the water level in the storage tank 220 is maintained at a position lower than the overflow section 226 before the introduction of the bottom mud (mud), the water level is adjusted after the introduction of the bottom mud (mud), and the pump 256 is driven. Good.

(Third embodiment: Suspension separator 400)
Suspension-containing liquids containing suspensions are introduced into the above-described suspension separators 100 and 200. In the suspension separators 100 and 200, suspensions in the suspension-containing liquids are transferred. The configuration for separation (removal) has been described. In the present embodiment, a suspension separation apparatus 400 that converts ions in an introduced solution into a suspension (solid) and separates the converted suspension will be described.

For example, groundwater contains divalent iron ions (Fe ²⁺ ), and if you try to use groundwater on the ground, the groundwater is exposed to air and the divalent iron ions in the groundwater are trivalent. Oxidized to iron (III). Then, trivalent iron (III) precipitates as iron hydroxide (Fe (OH) ₃ ), colors water, and closes the pipe, so iron hydroxide (Fe Removal of (OH) ₃ ) is desired.

  FIG. 7 is a diagram for explaining a specific configuration of the suspension separator 400 according to the third embodiment. As shown in FIG. 7, the suspension separation device 400 includes a storage tank 410, a partition plate 412, an adsorbent 420, an introduction unit 430, a circulation means 432, an aeration unit 440, a suction unit 450, And a stirring unit 460. The suspension separator 400 according to the present embodiment includes a normal operation in which ions that are insolubilized when oxidized are oxidized to form a suspension, and the suspension is adsorbed on the adsorbent 420. The maintenance operation for desorbing the suspension adsorbed on the adsorbent 420 is alternately performed, the aeration unit 440 is driven during the normal operation, and the suction unit 450 and the stirring unit 460 are driven during the maintenance operation.

  The storage tank 410 is a tank that can store an ion-containing liquid M1 that is a liquid containing ions (hereinafter referred to as insolubilized ions; for example, divalent iron ions) that are insolubilized when oxidized. is there. In addition, a partition plate 412 that partitions the inner region of the storage tank 410 vertically (in the Z-axis direction in FIG. 7) is provided in the storage tank 410. The partition plate 412 is provided with a plurality of holes 412a through which the adsorbent 420 described later cannot pass, specifically, a plurality of holes 412a smaller than the diameter of the adsorbent 420 and larger than the suspension diameter. By accommodating the adsorbent 420 above 412, it is possible to prevent the adsorbent 420 from flowing out below the partition plate 412. Hereinafter, of the internal region of the storage tank 410, the region above the partition plate 412 is referred to as an upper region, and the region below the partition plate 412 is referred to as a lower region.

  The adsorbent 420 is a sponge made of a porous resin (for example, polyurethane foam), and adsorbs the suspension in the ion-containing liquid M1. The shape of the adsorbent 420 is, for example, a cube having a side of about 15 mm to 25 mm. By setting the shape of the adsorbent 420 to a size such as a cube having a side of about 15 mm to 25 mm, clogging of the adsorbent 420 into the hole 412a of the partition plate 412 can be prevented, and handling is easy. In addition, it is possible to avoid a situation where the specific surface area for adsorbing the suspension becomes too small. In FIG. 7, the adsorbent 420 and the hole 412 a are shown larger than the storage tank 410 for easy understanding.

  The present inventors have found that a porous resin having pores having a pore diameter of 200 μm to 800 μm efficiently adsorbs a suspension of about 10 μm to 300 μm. Therefore, in this embodiment, as the adsorbent 420, A porous resin having pores with a pore size of 200 μm to 800 μm (for example, 500 μm) is used as the adsorbent 420. The adsorbent 420 is preferably an open-cell porous resin. By adopting an open-cell porous resin, the adsorbability of the suspended matter by the adsorbent 420 can be improved.

  The introduction unit 430 pumps the ion-containing liquid M1 from an ion-containing liquid M1 source such as a groundwater source, and introduces the ion-containing liquid M1 into the upper side of the storage tank 410. More specifically, the introduction unit 430 includes an introduction pipe 430a routed from the ion-containing liquid M1 source to the storage tank 410, and a pump 430b provided in the introduction pipe 430a, and drives the pump 430b. Thus, the ion-containing liquid M1 is pumped out from the ion-containing liquid M1 source, and the ion-containing liquid M1 is introduced into the upper part of the storage tank 410.

  The circulation means 432 discharges treated water (purified water), which is a suspension-containing liquid from which the suspended matter has been removed by the adsorbent 420, from the lower side of the storage tank 410 while maintaining the water level of the storage tank 410. By doing so, a liquid flow (downflow) directed vertically downward (in the positive direction of the Z axis in FIG. 7) is formed in the storage tank 410. More specifically, in the present embodiment, the circulation means 432 includes a drawing pipe 434 and a discharge pipe 436.

  The extension pipe 434 is a pipe having one end 434 a connected to the lower side of the storage tank 410, extending vertically upward outside the storage tank 410, and the other end 434 b being opened. A discharge pipe 436 that is folded vertically downward is connected to the extension pipe 434, and when the ion-containing liquid M <b> 1 is continuously introduced into the storage tank 410 by the introduction unit 430, the ion-containing liquid M <b> 1 in the storage tank 410. Liquid (treated water) is discharged through the extension pipe 434 and the discharge pipe 436 in a state where the water level is maintained at a height substantially equal to the lower end LE of the discharge pipe 436 at the connection position between the extension pipe 434 and the discharge pipe 436. Will be. That is, the ion-containing liquid M1 introduced from the introduction part 430 to the upper side of the storage tank 410 flows in the storage tank 410 vertically downward (in the positive direction of the Z axis in FIG. 7).

  Further, in the present embodiment, an air diffuser 442 constituting the aeration unit 440 is disposed below the partition plate 412 (lower region) in the storage tank 410. The aeration unit 440 includes, for example, an aeration unit 442 configured with an air diffuser or a diffusion plate having a pore diameter of about 300 μm, and a blower 444 that sends an oxidizing gas to the aeration unit 442, and an adsorbent 420. The ion-containing liquid M1 is aerated by supplying an oxidizing gas (for example, oxygen, ozone) or a mixed gas (for example, air) of an oxidizing gas to the ion-containing liquid M1 from below. Needless to say, bubbles formed by the gas supplied from the aeration unit 440 pass through the holes 412 a of the partition plate 412.

With the configuration including the aeration unit 440, the insolubilized ions contained in the ion-containing liquid M1 can be oxidized to form a suspension (solid). For example, when the insolubilized ion is a divalent iron ion, the aeration unit 440 aerates the oxidizing gas, whereby the divalent iron ion is oxidized to trivalent iron (III) and the trivalent iron (III ) Becomes iron hydroxide (Fe (OH) ₃ ) as a suspension.

  Further, by providing the aeration unit 440, the ion-containing liquid M1 and the adsorbent 420 can be easily contacted in the upper region. Therefore, the suspension adsorbing efficiency of the adsorbent 420 can be improved.

  Note that when the gas is aerated by the aeration unit 440, the suspended matter moves upward (floats) as the bubbles rise in the ion-containing liquid M1. On the other hand, the distribution means 432 discharges the ion-containing liquid M1 vertically downward. Here, by adjusting the amount of gas to be aerated and the introduction amount of the ion-containing liquid M1, the suspended matter in the storage tank 410 is avoided while avoiding the situation where the suspended suspension is mixed into the treated water. It becomes possible to increase the residence time.

  The ion-containing liquid M1 is exposed to the oxidizing gas while flowing downward in the storage tank 410, and is exposed to the adsorbent 420 in the upper region, so that the insolubilized ions contained in the ion-containing liquid M1. Is oxidized to produce a suspension, and the suspension is adsorbed on the adsorbent 420, whereby the suspension is removed from the ion-containing liquid M1. Therefore, the treated water from which the suspended matter has been removed from the ion-containing liquid M1 is discharged through the extension pipe 434 and the discharge pipe 436.

  The suction unit 450 desorbs (desorbs) the suspension from the adsorbent 420 during the maintenance operation. More specifically, the suction unit 450 includes a suction pipe 452 branched from the upstream side of the connection position of the discharge pipe 436 in the extension pipe 434 and a pump 454 provided in the suction pipe 452. , The liquid containing the adsorbent 420 is sucked, and the suspended matter is desorbed from the adsorbent 420.

  By doing so, the suspension adsorbed by the adsorbent 420 in the storage tank 410 can be desorbed from the adsorbent 420, and the adsorbing ability of the adsorbent 420 can be regenerated. The suspension-containing liquid M2 discharged from the suction tube 452 contains a suspension, and only the suspension can be taken out efficiently.

  The agitating unit 460 is configured to include an air diffuser 462 configured by an air diffuser or a diffuser plate and a blower 464 that sends gas to the air diffuser 462 during the maintenance operation. A gas (for example, air) is supplied to the bottom of the adsorbent 420 to stir the adsorbent 420. The bubble diameter of the gas supplied from the aeration unit 462 of the stirring unit 460 is larger than the bubble diameter of the oxidizing gas supplied from the diffusion unit 442 of the aeration unit 440. In addition, by configuring the air diffuser 462 of the stirring unit 460 with a simple tube, bubbles having a larger diameter can be introduced. The timing of desorption of the suspension from the adsorbent 420 by the suction unit 450 and the timing of stirring of the adsorbent 420 by the stirring unit 460 will be described in detail later.

  As described above, according to the suspension separation device 400 according to the present embodiment, the ion-containing liquid M1 is aerated with an oxidizing gas and is simply circulated (contacted) to the adsorbent 420. Insolubilized ions can be efficiently separated from the ion-containing liquid M1. Therefore, it becomes possible to continuously remove the insolubilized ions from the ion-containing liquid M1 as a suspension.

  In addition, since only the suspension can be separated without introducing a substance different from the suspension such as a flocculant, it is possible to prevent an increase in the volume of the object to be disposed of after the separation.

  Further, a partition plate 412 is provided, and the adsorbent 420 is disposed in the upper region and the air diffuser 442 is disposed in the lower region, whereby the hole (gas outlet) of the air diffuser 442 is blocked by the adsorbent 420. It is possible to avoid a situation where the efficiency of aeration is reduced. Further, it is possible to prevent the suction part 450 from sucking the adsorbent 420 during the maintenance operation.

  Furthermore, in the suspension separation device 400 of the present embodiment, the adsorbent 420 is not spread over the entire surface of the partition plate 412, but the upper region is filled with the block adsorbent 420 in a flowable manner. It is possible to prevent the adsorbent 420 from being clogged by the suspension.

(Suspension separation method)
Subsequently, a suspension separation method using the suspension separator 400 will be described. FIG. 8 is a flowchart for explaining the process flow of the suspension separation method according to the third embodiment. As shown in FIG. 8, the suspension separation method according to this embodiment includes an oxidation / adsorption process step S410 (normal operation), a determination process step S420 (normal operation), an agitation process step S430 (maintenance operation), and a desorption process. When each process of step S440 (maintenance operation) is performed and the process of the desorption process step S440 is completed, the process is repeated from the process of the oxidation / adsorption process step S410. Hereinafter, each step in the suspension separation method will be described.

(Oxidation / adsorption process step S410)
In the oxidation / adsorption process step S410, the introduction unit 430 introduces the ion-containing liquid M1 from the upper side of the storage tank 410 containing the adsorbent 420, and supplies the oxidizing gas to the ion-containing liquid M1 from below the adsorbent 420. Then, the ion-containing liquid M1 is aerated to make the insolubilized ions in the ion-containing liquid M1 into a suspension, and the ion-containing liquid M1 is circulated (contacted) to the adsorbent 420 and suspended in the adsorbent 420. Is the process of discharging the treated water from the lower side of the storage tank 410 through the extension pipe 434 and the discharge pipe 436.

  By performing the process of the oxidation / adsorption process step S410, insolubilized ions in the ion-containing liquid M1 are made into a suspension, and the suspension is adsorbed while the ion-containing liquid M1 is circulated through the adsorbent 420. And the suspension can be continuously removed from the ion-containing liquid M1.

(Judgment process step S420)
The determination step S420 is a step of determining whether or not the concentration of the suspension in the treated water discharged from the discharge pipe 436 is equal to or higher than a predetermined value E. Here, the value E is the maximum value of the concentration of the suspension that is acceptable in the treated water. If it is determined that the concentration of the suspension in the treated water discharged from the discharge pipe 436 is less than the value E (NO in step S420), the processing from the oxidation / adsorption process step S410 is repeated, and the discharge pipe If it determines with the density | concentration of the suspension in the treated water discharged | emitted from 436 being more than the value E (YES in step S420), a process will be moved to the following stirring process step S430. If driving experience is accumulated, the determination process step S420 may be omitted, and the process may proceed to the stirring process step S430 after a certain time.

(Agitating step S430)
If it is determined in the determination step S420 that the concentration of the suspension in the treated water discharged from the discharge pipe 436 is equal to or higher than the value E, the pump 430b is stopped and the storage tank 410 by the introduction unit 430 is stopped. The introduction of the ion-containing liquid M1 into is stopped. As described above, the extension pipe 434 is a pipe in which one end 434a is connected to the lower side of the storage tank 410, extends vertically upward outside the storage tank 410, and the other end 434b is opened. When the introduction of the ion-containing liquid M1 into the storage tank 410 by 430 is stopped, the water level of the ion-containing liquid M1 in the storage tank 410 becomes lower than the lower end LE of the discharge pipe 436 at the connection position between the extension pipe 434 and the discharge pipe 436. The discharge of the treated water through the extension pipe 434 and the discharge pipe 436 is stopped in a state where the height is maintained at substantially the same height.

  Then, the adsorbent 420 is agitated by driving the blower 464 constituting the agitating unit 460 and supplying gas from the aeration unit 462 to the ion-containing liquid M1 accommodated in the upper region of the accommodating tank 410. The agitation unit 460 agitates the adsorbent 420, so that the binding force of adsorption between the adsorbent 420 and the suspension in the oxidation / adsorption step S410 can be reduced.

(Desorption process step S440)
Subsequently, the adsorbent 420 is sucked by driving the pump 454 constituting the suction unit 450 and sucking the suspension-containing liquid M2 stored in the storage tank 410. Then, the suspension adsorbed on the adsorbent 420 is desorbed, and the suspension-containing liquid M2 is discharged from the suction tube 452.

  As described above, according to the suspension separation method according to the present embodiment, insolubilized ions are efficiently separated from the ion-containing liquid M1, and an increase in the volume of an object (suspension) to be disposed of after separation is prevented. It becomes possible to do.

(Example 5)
An ion-containing liquid M1 containing divalent iron ions as ions that become insoluble and become a suspension when oxidized is processed by the suspension separator 400. The concentration of total iron in the ion-containing liquid M1 was 3 mg / L, and the concentration of divalent iron ions was 1.5 mg / L. When such an ion-containing liquid is introduced into the storage tank 410 containing the adsorbent 420 and circulated for 1 hour while aeration of the oxidizing gas is performed by the aeration unit 440, all of the treated water (purified water) is treated. The iron concentration was 0.5 mg / L. On the other hand, when the ion-containing liquid M1 is introduced into the storage tank 410 that does not store the adsorbent 420 and is circulated for 1 hour while aeration of the oxidizing gas is performed by the aeration unit 440, the ion-containing liquid M1 is contained in the treated water (purified water). The total iron concentration was 1.5 mg / L. Thereby, it turned out that the adsorbent 420 adsorb | sucks a suspension (iron hydroxide (Fe (OH) ₃ )) efficiently.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  For example, although the case where the shape of the adsorbents 120 and 420 is a cube has been described in the above embodiment, the shape of the adsorbents 120 and 420 is not limited, and may be a polygon other than a cube or a sphere. It may be a hemisphere.

  In the above-described embodiment, the agitating units 160 and 460 are agitating the adsorbents 120 and 420 by aeration. However, as long as the adsorbents 120 and 420 can be agitated, other configurations are adopted as well as aeration. May be. For example, you may comprise the stirring parts 160 and 460 with a rotary blade. Further, the aeration units 140 and 440 can function as a stirring unit. In this case, the adsorbents 120 and 420 may be agitated by supplying gas stronger than normal aeration by the aeration units 140 and 440.

  Further, in the above-described embodiment, the agitation units 160 and 460 agitate the adsorbents 120 and 420 (agitation step S130, agitation) before the aspiration (desorption process steps S140 and S440) by the aspiration units 150 and 450. Although the configuration for performing Step S230 and Step S430) has been described, the stirring process Step S130, Step S230, and Step S430, and the Desorption Process Step S140 and Step S440 may be performed simultaneously (in parallel).

  In the above-described embodiment, when the adsorbents 120 and 420 are sucked by the suction units 150 and 450, water may be sprinkled from above the adsorbents 120 and 420.

  In the above-described embodiment, the case where the pretreatment unit 210 includes the storage tank 220, the partition plate 222, the aeration unit 224, the overflow unit 226, and the baffle plate 228 is taken as an example. Explained. However, the pretreatment unit 210 only needs to be able to separate solids from the suspension-containing liquid, and may be, for example, a net that can capture solids (sand) and allow the suspensions to circulate.

  In the above-described embodiment, the case where the circulation units 132 and 432 include the extending pipes 134 and 434 and the discharge pipes 136 and 436 has been described as an example. The treated water (purified water), which is a suspension-containing liquid from which the suspended matter has been removed by the adsorbents 120 and 420, is discharged from the lower side of the storage tanks 110 and 410 while maintaining the water level of the storage tanks 110 and 410. If it can be done, there is no limitation on the configuration. For example, instead of the extension pipes 134 and 434, a valve or a pump for discharging the liquid while maintaining the pressure at a predetermined value may be employed.

  In the above-described embodiment, the case where the suction units 150 and 450 include the suction pipes 152 and 452 and the pumps 154 and 454 has been described as an example. There is no limitation on the configuration as long as the suspended matter can be desorbed.

  For example, as shown in FIG. 9A, the suction portions 150 and 450 include a branch pipe 510 branched from the bottom of the extension pipes 134 and 434, a valve 512 provided in the branch pipe 510, a storage tank 110, A drain tank 520 that is disposed vertically below the bottom surface of 410 (in the positive direction of the Z axis in FIG. 9A) and stores the suspension-containing liquids L2 and M2 delivered from the branch pipe 510; A pump 522 provided in the tank 520 and a discharge pipe 524 connected to the pump 522 are configured.

  The valve 512 is closed during normal operation, and the valve 512 is opened during maintenance operation. Then, the suspension-containing liquids L2 and M2 in the storage tanks 110 and 410 flow out to the drain tank 520 due to gravity, and the suspension is desorbed from the adsorbents 120 and 420. Then, by driving the pump 522, the suspension-containing liquids L2 and M2 can be taken out from the drain tank 520 through the discharge pipe 524 to the outside.

  Further, as shown in FIG. 9B, the suction portions 150 and 450 are branched pipes that extend vertically downward (in the positive direction of the Z axis in FIG. 9B) from the bottoms of the storage tanks 110 and 410. 530, a valve 532 provided in the branch pipe 530, and a drain tank 520 that is disposed vertically below the bottom surfaces of the storage tanks 110 and 410 and stores the suspension-containing liquids L2 and M2 delivered from the branch pipe 530. And a pump 522 provided in the drain tank 520 and a discharge pipe 524 connected to the pump 522.

  The valve 532 is closed during normal operation, and the valve 532 is opened during maintenance operation. Then, the suspension-containing liquids L2 and M2 in the storage tanks 110 and 410 flow out to the drain tank 520 due to gravity, and the suspension is desorbed from the adsorbents 120 and 420. Then, by driving the pump 522, the suspension-containing liquids L2 and M2 can be taken out from the drain tank 520 through the discharge pipe 524 to the outside.

  Moreover, in the said embodiment, although the suspension-separation apparatus 100,200,400 demonstrated the structure provided with the partition plates 112,222,412, it is not necessary to provide the partition plates 112,222,412.

  Moreover, in the said embodiment, although the suspension separation apparatus 100,200,400 demonstrated the structure provided with the suction part 150,450, in the structure etc. which make the adsorbent 120,420 disposable, the suction part 150, 450 may not be provided.

  Moreover, in the said embodiment, although the suspension separation apparatus 100,200,400 demonstrated the structure provided with the stirring parts 160 and 460, the stirring parts 160 and 460 are not essential structures.

  Moreover, although the suspension separation apparatus 200 demonstrated the structure provided with the return part 250 in the said embodiment, the return part 250 is not an essential structure. For example, industrial water or tap water may be introduced into the storage tank 220.

  Moreover, although the suspension separation apparatus 200 demonstrated the structure provided with the solid substance removal means 260 in the said embodiment, the solid substance removal means 260 is not an essential structure.

  In addition, the suspension separation device 400 described in the third embodiment may include the pretreatment unit 210, the return unit 250, and the solid matter removing unit 260.

  In addition, each process of the suspension separation method of this specification does not necessarily need to process in time series along the order described as a flowchart, and may process it in parallel.

  The present invention can be used in a suspension separation apparatus and a suspension separation method for separating a suspension contained in a liquid.

100, 200, 400 ... suspension separator 110 ... storage tank (first storage tank)
112 ... Partition plate (first partition plate)
120, 420 ... adsorbents 132, 432 ... distribution means 140 ... aeration part (first aeration part)
150, 450 ... suction section 160, 460 ... stirring section 210 ... pretreatment section 220 ... storage tank (second storage tank)
224 ... Aeration part (second aeration part)
226 ... overflow part 228 ... baffle plate 250 ... return part 260 ... solid matter removing means 410 ... storage tank 412 ... partition plate 440 ... aeration part

Claims (14)

A first storage tank capable of storing a suspension-containing liquid that is a liquid containing at least a suspension;
One or a plurality of adsorbents composed of a porous resin and accommodated in the first storage tank together with the suspension-containing liquid to adsorb the suspension in the suspension-containing liquid;
Distribution means for discharging treated water, which is a suspension-containing liquid from which the suspension is removed by the adsorbent, from the lower side of the first storage tank while maintaining the water level of the first storage tank;
A first aeration unit for supplying gas to the suspension-containing liquid from below the adsorbent to aerate the suspension-containing liquid;
A suspension separation apparatus comprising: It has a plurality of holes through which the adsorbent cannot pass, and includes a first partition plate that partitions the inner region of the first storage tank up and down,
2. The suspension separator according to claim 1, wherein the adsorbent is accommodated above the first partition plate, and the first aeration unit is accommodated below the first partition plate. .   The suspension separation apparatus according to claim 1, further comprising a suction unit that desorbs the suspension from the adsorbent. The suspension-containing liquid contains a solid having a particle size larger than that of the suspension,
A pretreatment is provided on the upstream side of the first storage tank, separates the solid from the suspension-containing liquid, and introduces the suspension-containing liquid from which the solid is separated into the first storage tank. The suspension separator according to any one of claims 1 to 3, further comprising a section. The pre-processing unit is
A tank for storing the suspension-containing liquid containing the solid matter, a second storage tank in which the horizontal cross-sectional area of the inner region gradually increases as it goes vertically upward;
A second aeration unit for supplying gas to the suspension-containing liquid containing the solid to aerate the suspension-containing liquid containing the solid;
When the suspension-containing liquid in the second storage tank reaches a predetermined water level, the suspension-containing liquid in the second storage tank is allowed to overflow above the first storage tank. The overflow section,
A baffle plate that suppresses movement of bubbles formed by the gas introduced by the second aeration unit to the overflow portion;
A sedimentation region that is formed between the baffle plate and the overflow section, and sediments the solid matter from the suspension-containing liquid containing the solid matter;
The suspension separation device according to claim 4, comprising:   The suspension separation apparatus according to claim 5, further comprising a return section that returns the treated water discharged by the circulation means to the second storage tank.   The suspension separating apparatus according to claim 5 or 6, further comprising solid matter removing means for discharging the solid matter accumulated in the second containing tank to the outside of the second containing tank. A storage tank that can store an ion-containing liquid that is a liquid containing ions that become insoluble and become a suspension when oxidized;
One or a plurality of adsorbents composed of a porous resin and accommodated in the containing tank together with the ion-containing liquid to adsorb the suspension;
A flow means for discharging treated water, which is an ion-containing liquid from which the suspension is removed by the adsorbent, from the lower side of the storage tank while maintaining the water level of the storage tank,
An aeration unit for supplying an oxidizing gas to the ion-containing liquid stored in the storage tank to aerate the ion-containing liquid;
A suspension separation apparatus comprising:   The suspension separator according to claim 8, wherein the ions are divalent iron ions.   The suspension separation device according to claim 8 or 9, further comprising a suction unit for desorbing the suspension from the adsorbent. A suspension separation method using a storage tank containing one or more adsorbents composed of a porous resin,
A suspension-containing liquid that is a liquid containing at least a suspension is introduced from the upper side of the storage tank, and the suspension-containing liquid is circulated through the adsorbent, and the suspension is suspended from below the adsorbent. A step of supplying a gas to the substance-containing liquid and aerating the suspension-containing liquid to adsorb the suspension to the adsorbent and then discharging the suspension from the lower side of the storage tank. Suspension separation method. A suspension separation method using a storage tank containing one or more adsorbents composed of a porous resin,
An ion-containing liquid, which is a liquid containing ions that become insoluble and become suspended when oxidized, is introduced from the upper part of the storage tank, and an oxidizing gas is supplied to the ion-containing liquid from below the adsorbent. And aeration of the ion-containing liquid, allowing the ion-containing liquid to flow through the adsorbent, adsorbing the suspension on the adsorbent, and then discharging from the lower side of the storage tank. Suspension separation method characterized.   The suspension separation method according to claim 11 or 12, further comprising a step of desorbing the suspension from the adsorbent in the discharging step.   The suspension separation method according to claim 13, further comprising a step of stirring the adsorbent adsorbing the suspension before or in parallel with the desorption step.