JP5211852B2 - Pressurized levitating apparatus and pressurized levitating method - Google Patents

Pressurized levitating apparatus and pressurized levitating method Download PDF

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JP5211852B2
JP5211852B2 JP2008135512A JP2008135512A JP5211852B2 JP 5211852 B2 JP5211852 B2 JP 5211852B2 JP 2008135512 A JP2008135512 A JP 2008135512A JP 2008135512 A JP2008135512 A JP 2008135512A JP 5211852 B2 JP5211852 B2 JP 5211852B2
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JP2009279537A (en
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雅治 山下
有子 吉田
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株式会社Ihi
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  The present invention relates to a pressurized levitation apparatus and a pressurized levitation method for separating raw water into a solid component and a liquid component by supplying pressurized water in which a gas is dissolved in the raw water containing the solid component and then releasing the pressure. is there.

Conventionally, a pressure levitation device is known as a solid-liquid separation device that separates raw water containing a solid component into a solid component and a liquid component.
This pressurized levitation device dissolves a gas such as air by applying pressure to the raw water containing the solid component, and causes bubbles generated when the pressure is released to atmospheric pressure or the like to adhere to the solid component and float. The raw water is separated into a solid component and a liquid component.

  Nowadays, there is a demand for a method for treating wastewater generated when potato starch is produced. For example, Patent Document 1 discloses a deproteinization treatment in which a protein contained in a primary decanter juice that is one of wastewater generated when potato starch is produced is coagulated, separated and recovered, and the recovered coagulated protein is processed by a microorganism. Has been proposed.

However, the wastewater generated when producing potato starch is not limited to the primary decanter juice, and other wastewater such as a secondary decanter juice having a lower protein content than the primary decanter juice is also present. .
In addition, the primary decanter juice (deproteinized solution) from which the protein has been separated and recovered by the deproteinization treatment as shown in Patent Document 1 is not completely removed.
Such a secondary decanter juice or effluent such as a deproteinization treatment solution has a low protein content, and therefore it is not preferable to perform a deproteinization treatment from the viewpoint of thermal energy balance.

For this reason, conventionally, wastewater such as secondary decanter juice and deproteinization treatment liquid is treated by being stored for a long time in a large gravity precipitation tank.
However, the treatment in such a sedimentation tank has a problem that it is necessary to secure a space for installing a large sedimentation tank and the treatment takes a long time. Furthermore, since the colloidal component (floating solid) contained in the wastewater is not precipitated, it is difficult to separate from the liquid component.

Then, the method of processing by using wastewater, such as a secondary decanter soup liquid and a deproteinization processing liquid, as raw | natural water, and using for the pressurization floating apparatus mentioned above can be considered.
Specifically, the drug is added to the wastewater to coagulate and aggregate the protein, and the solid components contained in the wastewater are separated by bubbles.
Japanese Patent No. 3846131

However, when wastewater such as secondary decanter juice or deproteinization treatment liquid is supplied to a pressurized flotation device, a large amount of foam components are generated due to the proteins contained in these wastewaters.
And such a foam component produces various malfunctions in the process in a pressure levitation apparatus. Specifically, the foam component inhibits the mixing of the wastewater, which is the raw water, and the drug. If a large amount of drug is not added, coagulation and aggregation do not proceed and an excessive drug is required. Further, the foam component hinders the floating of the solid component due to the bubbles, and it becomes difficult to sufficiently separate and recover the solid component. Moreover, since a foam component accumulates in the upper layer of raw | natural water or treated water, it becomes difficult to detect the liquid level of raw | natural water or treated water. Furthermore, cavitation occurs when the foam component enters the pump that feeds raw water or treated water.

  The present invention has been made in view of the above-described problems. In the pressurized levitation apparatus and the pressurized levitation method, even when waste water such as a secondary decanter juice or a deproteinization treatment liquid is used as raw water, The object is to suppress the occurrence of defects due to the foam component.

  In order to achieve the above object, the pressure levitation apparatus of the present invention adds a pH adjuster and an inorganic flocculant to raw water containing proteins and floating solids, and stirs the fine solids in the raw water. A rapid stirring tank to be formed, a slow stirring tank to agglomerate the fine solids by adding a polymer flocculant to the raw water in which the fine solids are produced and agitate the fine solids, and the agglomeration A pressurized water supply unit that supplies pressurized water in which gas is dissolved in the raw water containing flock; and a separation unit that separates the raw water into a solid component and a liquid component by releasing the pressure of the raw water supplied with the pressurized water. And a defoaming agent supplying means for supplying an antifoaming agent to the raw water before being supplied to the rapid stirring tank, and the raw water, the pH adjuster, and the inorganic The collecting agent is supplied below the level of the raw water stored in the rapid stirring tank, and the polymer flocculant is supplied below the level of the raw water stored in the slow stirring tank. Features.

  According to the pressurized flotation device of the present invention having such characteristics, the antifoaming agent is supplied to the raw water before being supplied to the rapid stirring tank by the antifoaming agent supply means, and stored in the rapid stirring tank. A pH adjuster and an inorganic flocculant are supplied below the liquid level of the raw water, and a polymer flocculant is supplied below the liquid level of the raw water stored in the slow stirring tank.

  Moreover, in the pressurized levitation apparatus of this invention, when the protein concentration of the said raw | natural water is 6200 ppm, the structure that the addition amount of the said antifoamer is 10.7 ppm is employ | adopted.

In the on floatation device of the present invention, using poly iron solution as the inorganic coagulant, a construction is adopted to the amount of the inorganic flocculant and 4000cc / m 3 ~6000cc / m 3 .

Further, in the pressurized levitation apparatus of the present invention, a configuration is adopted in which the amount of the inorganic flocculant added is 4000 cc / m 3 .

In the pressurized levitation apparatus of the present invention, a cationic / anionic amphoteric polymer mainly composed of polyacrylamide is used as the polymer flocculant, and the amount of the polymer flocculant added is 3000 cc / m 3 to 5000 cc. / M 3 and a concentration of 0.15 wt% are employed.

Further, in the pressurized levitation apparatus of the present invention, a configuration is adopted in which the amount of the polymer flocculant added is 3500 cc / m 3 .

  Moreover, in the pressurization levitation apparatus of this invention, the structure of setting the pH value of the said raw | natural water to 5-7 is employ | adopted by adding the said pH adjuster to the said raw | natural water.

  Moreover, in the pressurization levitation apparatus of this invention, the structure which sets the pH value of the said raw | natural water to 6 is employ | adopted.

  Next, the pressurized flotation method of the present invention is a rapid stirring step in which a fine solid is generated in the raw water by adding a pH adjuster and an inorganic flocculant to the raw water containing the protein and the floating solid and stirring. And a slow agitation step of aggregating the fine solids by adding a polymer flocculant to the raw water from which the fine solids are produced to agglomerate flocks, and the agglomerated flocs Pressurized flotation comprising a pressurized water supply step for supplying pressurized water in which a gas is dissolved in the raw water, and a separation step for separating the raw water into a solid component and a liquid component by releasing the pressure of the raw water supplied with the pressurized water. The method comprises a defoaming agent supplying step for supplying an antifoaming agent to the raw water before being subjected to the rapid stirring step, and the raw water, the pH adjusting agent and the inorganic flocculant are It is supplied below the level of the raw water stored in the rapid stirring step, and the polymer flocculant is supplied below the level of the raw water stored in the slow stirring step. To do.

  According to the pressurized flotation method of the present invention having such characteristics, the antifoaming agent is supplied to the raw water before being subjected to the rapid stirring step by the antifoaming agent supply step, and stored in the rapid stirring step. The pH adjuster and the inorganic flocculant are supplied below the liquid level of the raw water, and the polymer flocculant is supplied below the liquid level of the raw water stored in the slow stirring step.

  Moreover, in the pressurized levitation method of this invention, when the protein concentration of the said raw | natural water is 6200 ppm, the structure that the addition amount of the said antifoamer is 10.7 ppm is employ | adopted.

In the floatation on the method of the present invention, using poly iron solution as the inorganic coagulant, a construction is adopted to the amount of the inorganic flocculant and 4000cc / m 3 ~6000cc / m 3 .

Further, in the pressurized levitation method of the present invention, a configuration is adopted in which the amount of the inorganic flocculant added is 4000 cc / m 3 .

In the pressurized levitation method of the present invention, a cationic / anionic amphoteric polymer mainly composed of polyacrylamide is used as the polymer flocculant, and the amount of the polymer flocculant added is 3000 cc / m 3 to 5000 cc. / M 3 and a concentration of 0.15 wt% are employed.

Further, in the pressurized levitation method of the present invention, a configuration in which the amount of the polymer flocculant added is 3500 cc / m 3 is employed.

  Moreover, in the pressurization floating method of this invention, the structure of setting the pH value of the said raw | natural water to 5-7 is employ | adopted by adding the said pH adjuster to the said raw | natural water.

  Further, in the pressurized levitation method of the present invention, a configuration in which the pH value of the raw water is 6 is adopted.

According to the pressurized flotation device of the present invention, the antifoaming agent is supplied to the raw water before being supplied to the rapid stirring tank by the antifoaming agent supply means, and is below the level of the raw water stored in the rapid stirring tank. The pH adjuster and the inorganic flocculant are supplied to the base, and the polymer flocculant is supplied below the level of the raw water stored in the slow stirring tank.
According to such a pressurized flotation device of the present invention, the defoaming agent is supplied to the raw water before being supplied to the rapid stirring tank by the defoaming agent supply means, thereby suppressing the generation of the foam component. It becomes possible. Furthermore, the pH adjuster and the inorganic flocculant are supplied below the liquid level of the raw water stored in the rapid stirring tank, and the polymer flocculant is supplied below the liquid level of the raw water stored in the slow stirring tank. Thus, the pH adjuster, the inorganic flocculant, and the polymer flocculant can be efficiently mixed into the raw water without being affected by the foam component accumulated in the upper layer of the raw water.
As described above, according to the pressurized levitation apparatus of the present invention, it is possible to suppress the generation of foam components and to efficiently mix chemicals such as pH adjusters, inorganic flocculants and polymer flocculants with raw water. It becomes possible to do. For this reason, even if it is a case where waste water, such as a secondary decanter soup liquid and a deproteinization processing liquid, is used as raw water in a pressurization floating device, it becomes possible to control generating of the fault resulting from a foam ingredient.

According to the pressurized flotation method of the present invention, the antifoaming agent is supplied to the raw water before being subjected to the rapid stirring step by the defoaming agent supplying step, and from the surface of the raw water stored in the rapid stirring step. A pH adjuster and an inorganic flocculant are supplied below, and a polymer flocculant is supplied below the level of the raw water stored in the slow stirring step.
According to such a pressurized flotation method of the present invention, the generation of foam components is suppressed by supplying the antifoaming agent to the raw water before being subjected to the rapid stirring process in the defoaming agent supplying process. It becomes possible. Furthermore, a pH adjuster and an inorganic flocculant are supplied below the liquid level of the raw water stored in the rapid stirring process, and a polymer flocculant is supplied below the liquid level of the raw water stored in the slow stirring process. By doing so, it becomes possible to efficiently mix the pH adjuster, the inorganic flocculant and the polymer flocculant with the raw water without being affected by the foam component accumulated in the upper layer of the raw water.
Thus, according to the pressurized levitation method of the present invention, it is possible to suppress the generation of foam components and to efficiently mix chemicals such as pH adjusters, inorganic flocculants and polymer flocculants with raw water. It becomes possible to do. For this reason, even if it is a case where waste_water | drain, such as a secondary decanter soup liquid and a deproteinization processing liquid, is used as raw | natural water in a pressurization floating method, it becomes possible to suppress generation | occurrence | production of the malfunction resulting from a foam component.

  Hereinafter, an embodiment of a pressurized levitation apparatus and a pressurized levitation method according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

FIG. 1 is a flow diagram showing a schematic configuration of the pressure levitation apparatus of the present embodiment.
As shown in this figure, the pressurized levitation apparatus S1 of this embodiment includes a rapid stirring tank 1, an antifoaming agent supply unit 2, a slow stirring tank 3, a pressurized water supply unit 4, a floating cell 5, a treated water tank 6, and a froth. A tank 7 is provided.

The rapid stirring tank 1 is for adding a pH adjusting agent Y1 and an inorganic flocculant Y2 to the raw water X1 supplied from the outside, and stirring the components to solidify the components dissolved in the raw water X1 to generate a solid. .
In this embodiment, the raw water X1 is, for example, a mixed solution of a secondary decanter juice and a deproteinized solution that is a processed solution obtained by deproteinizing the primary decanter juice in the process of producing potato starch, or The mixture is mixed with diluted water and methane fermentation treatment liquid (drainage obtained when methane fermentation is performed on the recovered protein obtained by deproteinizing the primary decanter juice). Thus, raw | natural water X1 contains the protein and the floating solid substance beforehand. And the flow volume with which the raw | natural water X1 is supplied to the rapid stirring tank 1 downstream is adjusted with the valve | bulb 8 installed in the middle of the flow path of the raw | natural water X1.
Moreover, as a pH adjuster, an alkaline thing is used when raw | natural water is acidic, and an acidic thing is used when raw | natural water is alkaline.
As the inorganic flocculant Y2, a polyiron solution, polyaluminum chloride, or the like can be used.

The rapid stirring tank 1 includes a storage tank 11 for storing the raw water X1 and a stirring device 12 for rapidly stirring the raw water X1 stored in the storage tank 11 together with the pH adjusting agent Y1 and the inorganic flocculant Y2.
And in this embodiment, the raw | natural water X1, the pH adjuster Y1, and the inorganic flocculant Y2 which are newly supplied below the liquid level of the raw | natural water X1 stored by the storage tank 11 are supplied. Specifically, the open ends of the supply pipes for the raw water X1, the pH adjusting agent Y1, and the inorganic flocculant Y2 are disposed below the liquid surface of the raw water X1, and the raw water X1, pH adjustment is performed via the supply pipe. By supplying the agent Y1 and the inorganic flocculant Y2 into the storage tank 11, the raw water X1, the pH adjuster Y1, and the inorganic flocculant Y2 are supplied below the liquid level of the raw water X1 stored in the storage tank 11.

The defoamer supply unit 2 supplies the defoamer Y3 to the raw water X1 before being supplied to the rapid stirring tank 1. The defoamer supply unit 2 includes an antifoam supply pump 21 that sends out the defoamer Y3, and an on-off valve 22 and a check valve 23 that are installed in the middle of the flow path of the defoamer Y3.
In addition, as an antifoamer Y3, the thing of an alcohol type antifoamer or a silicon type antifoamer can be used, for example.

The slow agitation tank 3 adds the polymer flocculant Y4 to the raw water X1 containing the fine solids supplied from the rapid agitation tank 1 and stirs to thereby remove the fine solids (rapid agitation tank 1) contained in the raw water X1. The solid matter produced in (1) and the floating solid matter contained in advance are agglomerated to form agglomerated floc.
As the polymer flocculant Y4, for example, a cationic / anionic amphoteric polymer containing polyacrylamide as a main component can be used.

The slow stirring tank 3 receives the raw water X1 overflowed from the storage tank 11 of the rapid stirring tank 1 and stores the raw water X1 and the raw water X1 stored in the storage tank 31 together with the polymer flocculant Y4. And a stirrer 32 for slow stirring.
In the present embodiment, the polymer flocculant Y4 is supplied below the level of the raw water X1 stored in the storage tank 31. Specifically, the open end of the supply pipe for the polymer flocculant Y4 is disposed below the liquid surface of the raw water X1, and the polymer flocculant Y4 is stored in the storage tank 31 through this supply pipe. The raw water X1 is supplied below the liquid level.

  The pressurized water supply unit 4 supplies pressurized water X3 in which air (gas) is dissolved to the raw water X1 discharged from the slow stirring tank 3. In this embodiment, the pressurized water supply unit 4 pressurizes a part of the treated water X2 discharged from the floating cell 5 to dissolve the air to generate the pressurized water X3, and supplies the generated pressurized water X3 to the raw water X1. To do.

  The pressurized water supply unit 4 takes in a part of the treated water discharged from the levitation cell 5 and sends out and pressurizes the circulating pump 41, the compressor 42 that sends out the compressed air, and the treated water and the compressed air to mix the pressurized water X 3. The mixing part 43 which produces | generates, and the valve | bulb 44 which adjusts the pressure of the pressurized water X3 are provided.

  The levitation cell 5 generates bubbles in the raw water X1 by releasing the pressure of the raw water X1 supplied with the pressurized water X3, and attaches the bubbles to the flocculation flocs contained in the raw water X1, thereby floating the raw water X1 in a solid state. It separates into a component and a liquid component. Then, the levitation cell 5 discharges the separated solid component as the levitation floss X4 and discharges the separated liquid component as the treated water X2.

  The levitation cell 5 receives the raw water X1 supplied with the pressurized water X3, and releases the pressure by storing the raw water X1 at atmospheric pressure, and the stirring device 52 for stirring the raw water X1 stored in the storage tank 51. And.

  The treated water tank 6 temporarily stores the treated water X2 discharged from the levitation cell 5 and then discharges it. The treated water tank 6 temporarily stores the treated water X2, and the stored water tank 6 stores the treated water X2. A pump 62 for discharging the treated water X2 to the outside of the storage tank 61 is provided.

  The floss tank 7 temporarily stores the floating floss X4 discharged from the floating cell 5 and then discharges it. The storage tank 71 temporarily stores the floating floss X4 and the storage tank 71 stores the floating floss X4. And a pump 72 for discharging the floating floss X4 to the outside of the storage tank 71.

  Next, the operation (pressure levitation method) of the pressure levitation device of the present embodiment configured as described above will be described.

  First, the raw water X1 before being supplied to the rapid stirring tank 1 is supplied with the antifoaming agent Y3 in the antifoaming agent supplying unit 2 (antifoaming agent supplying step). By supplying the antifoaming agent Y3 to the raw water X1 in this way, it is possible to suppress the generation of foam components in the raw water X1 on the downstream side.

The raw water X1 supplied with the defoamer Y3 is supplied to the rapid stirring tank 1.
Here, the raw water X1 is supplied below the liquid level of the raw water X1 previously stored in the storage tank 11 of the rapid stirring tank 1. For this reason, even when the foam component is accumulated in the upper layer of the storage tank 11 of the rapid stirring tank 1, new raw water X1 can be reliably supplied to the storage tank 11, and the raw water X1 is supplied at the time of supply. Is not disturbed, it is possible to suppress the generation of foam components in the raw water X1.

The raw water X1 supplied to the rapid stirring tank 1 is added with a pH adjusting agent Y1 and an inorganic flocculant Y2, and rapidly stirred together with these chemicals. As a result, the components dissolved in the raw water X1 are solidified to produce fine solids (rapid stirring step).
Here, the pH adjuster Y1 and the inorganic flocculant Y2 are supplied below the liquid level of the raw water X1 previously stored in the storage tank 11 of the rapid stirring tank 1. For this reason, even if it is a case where the foam component has accumulated in the upper layer of the storage tank 11 of the rapid stirring tank 1, the raw water X1 stored previously, the pH adjuster Y1, and the inorganic flocculant Y2 are reliably mixed. In addition, since the raw water X1 is not disturbed during the supply, it is possible to suppress the generation of foam components in the raw water X1.

Subsequently, the raw water X <b> 1 containing minute solids is supplied to the slow stirring tank 3. Then, the raw water X1 supplied to the slow stirring tank 3 is added with the polymer flocculant Y4 and slowly stirred together with the polymer flocculant Y4. As a result, the fine solids generated in the rapid stirring tank 1 and the floating solids contained in advance are aggregated to form aggregated flocs (slow stirring process).
Here, the polymer flocculant Y4 is supplied below the level of the raw water X1 stored in the storage tank 31 of the slow stirring tank 3 in advance. For this reason, even if it is a case where the foam component has accumulated in the upper layer of the storage tank 31 of the slow stirring tank 3, the raw water X1 stored previously and the polymer flocculant Y4 can be reliably mixed. Since the raw water X1 is not disturbed during the supply, it is possible to suppress the generation of foam components in the raw water X1.

Subsequently, the raw water X <b> 1 including the aggregated floc is supplied with the pressurized water X <b> 3 by the pressurized water supply unit 4. Then, the raw water X1 supplied with the pressurized water X3 is supplied to the floating cell 5.
The raw water X1 supplied to the levitation cell 5 is released from pressure and separated into a solid component and a liquid component by bubbles generated thereby (separation step). Then, the liquid component is discharged from the floating cell 5 as the treated water X2, and the solid component is discharged from the floating cell 5 as the floating floss X4.

  A part of the treated water X2 discharged from the levitation cell 5 is pumped up by the circulation pump 41, pressurized and mixed with the compressed air to become pressurized water X3, and the rest is supplied to the treated water tank 6 and temporarily. After being stored, it is discharged to the outside of the treated water tank 6.

  The floating floss X4 discharged from the floating cell 5 is supplied to the floss tank 7 and temporarily stored, and then discharged to the outside of the floss tank 7.

According to the pressurized levitation apparatus of the present embodiment as described above, the antifoaming agent Y3 is supplied to the raw water X1 before being supplied to the rapid stirring tank 1 by the antifoaming agent supply unit 2, and the rapid stirring tank is supplied. The pH adjuster Y1 and the inorganic flocculant Y2 are supplied below the liquid level of the stored raw water, and the polymer flocculant Y4 is supplied below the liquid level of the raw water X1 stored in the slow stirring tank 3.
According to such a pressure levitation device of this embodiment, the antifoaming agent Y3 is supplied to the raw water X1 before being supplied to the rapid stirring tank 1 by the antifoaming agent supply unit 2, so that bubbles are generated. It becomes possible to suppress generation | occurrence | production of a component. Further, the pH adjuster Y1 and the inorganic flocculant Y2 are supplied below the liquid level of the raw water X1 stored in the rapid stirring tank 1, and the polymer is below the liquid level of the raw water X1 stored in the slow stirring tank 3. By supplying the flocculant Y4, the pH adjuster Y1, the inorganic flocculant Y2, and the polymer flocculant Y4 can be efficiently mixed into the raw water X1 without being affected by the foam components accumulated in the upper layer of the raw water X1. It becomes possible.
As described above, according to the pressurized levitation apparatus of the present embodiment, it is possible to suppress the generation of the foam component, and the chemicals such as the pH adjuster Y1, the inorganic flocculant Y2, and the polymer flocculant Y4 are used as raw water X1. It becomes possible to mix efficiently. For this reason, even if it is a case where drainage, such as a secondary decanter soup liquid and a deproteinization processing liquid, is used as raw water X1 in a pressurization levitation device, it becomes possible to control generating of the fault resulting from a foam ingredient.

Further, according to the pressurized levitation method of the present embodiment, the antifoaming agent Y3 is supplied to the raw water X1 before being subjected to the rapid stirring step by the antifoaming agent supplying step, and stored in the rapid stirring step. The pH adjusting agent Y1 and the inorganic flocculant Y2 are supplied below the liquid surface of the raw water X1, and the polymer flocculant Y4 is supplied below the liquid surface of the raw water X1 stored in the slow stirring step.
According to the pressurized levitation method of the present embodiment, the generation of foam components is performed by supplying the antifoaming agent Y3 to the raw water X1 before being subjected to the rapid stirring process in the antifoaming agent supply process. Can be suppressed. Furthermore, the pH adjusting agent Y1 and the inorganic flocculant Y2 are supplied below the liquid level of the raw water X1 stored in the rapid stirring process, and the polymer is below the liquid level of the raw water X1 stored in the slow stirring process. By supplying the flocculant Y4, the pH adjuster Y1, the inorganic flocculant Y2, and the polymer flocculant Y4 can be efficiently mixed with the raw water without being affected by the foam components accumulated in the upper layer of the raw water X1. It becomes.
As described above, according to the pressurized levitation method of the present embodiment, generation of foam components can be suppressed, and agents such as pH adjuster Y1, inorganic flocculant Y2, and polymer flocculant Y4 are used as raw water X1. It becomes possible to mix efficiently. For this reason, even if it is a case where waste_water | drain, such as a secondary decanter soup liquid and a deproteinization processing liquid, is used as raw | natural water in a pressurization floating method, it becomes possible to suppress generation | occurrence | production of the malfunction resulting from a foam component.

2-4 shows the experimental result of the Example of the pressurization levitating apparatus S1 of the said embodiment. In this example, as the raw water X1, the total solid is 7725 mg / l, the floating solid is 1393 mg / l, and the organic matter concentration (COD) is 1571 mg / l. The flow rate was 84 m 3 / hr.

FIG. 2 shows the use of a cationic and anionic amphoteric polymer mainly composed of polyacrylamide with a concentration of 0.15 wt% as the polymer flocculant Y4, the amount of the polymer flocculant Y4 added is 5000 cc / m 3 , and the pH is adjusted. and 6 the pH value of the raw water X1 after, using poly iron solution as an inorganic flocculant Y2, further amount of 3000cc / m 3 of inorganic coagulant Y2, 4000cc / m 3, 5000cc / m 3, 6000cc / m 3 It is a table | surface for comparing the determination with respect to the influence of a foam component at the time of changing to 7000cc / m < 3 >. In addition, in FIG. 2, the addition gram number with respect to 1 liter is written together with raw | natural water as addition amount of the inorganic flocculant Y2 and the polymer flocculent Y4.
As shown in this figure, the amount is 4000 cc / m 3 of inorganic coagulant Y2, 5000 cc / m 3, preferably results in the case of 6000 cc / m 3 is obtained, reducing the amount of the inorganic flocculant Y2 From this point of view, it can be seen that the addition amount of the inorganic flocculant Y2 is particularly preferably 4000 cc / m 3 .

FIG. 3 shows that the pH value of the raw water X1 after pH adjustment is 6, a polyiron solution is used as the inorganic flocculant Y2, the addition amount of the inorganic flocculant Y2 is 4000 cc / m 3, and the concentration as the polymer flocculant Y4 Using a cationic and anionic amphoteric polymer based on 0.15 wt% polyacrylamide, the amount of the polymer flocculant Y4 added is 3000 cc / m 3 , 3500 cc / m 3 , 4000 cc / m 3 , 4500 cc / m 3. It is a table | surface for comparing the determination with respect to the influence of a foam component at the time of changing to 5000 cc / m < 3 >. In addition, also in FIG. 3, the addition gram number with respect to 1 liter is written together with raw | natural water as addition amount of the inorganic flocculant Y2 and the polymer flocculent Y4.
As shown in this figure, preferable results were obtained in all cases where the addition amount of the polymer flocculant Y4 was 3000 cc / m 3 , 3500 cc / m 3 , 4000 cc / m 3 , 4500 cc / m 3 , and 5000 cc / m 3. From the viewpoint of reducing the amount of the polymer flocculant Y4 used, it can be seen that the amount of the polymer flocculant Y4 added is particularly preferably 3500 cc / m 3 .

FIG. 4 shows a cation containing a polyiron solution as the inorganic flocculant Y2, an addition amount of the inorganic flocculant Y2 of 4000 cc / m 3 , and a polymer flocculant Y4 having a polyacrylamide concentration of 0.15 wt% as a main component. When an anionic amphoteric polymer is used, the amount of the polymer flocculant Y4 added is 3500 cc / m 3, and the pH value of the raw water X1 after pH adjustment is changed to 5, 6, 7 It is a table | surface for comparing determination. In addition, also in FIG. 4, the addition gram number with respect to 1 liter is written together with raw | natural water as addition amount of the inorganic flocculant Y2 and the polymer flocculent Y4.
And as shown in this figure, it turns out that a preferable result is obtained in all the cases where the pH value of the raw water X1 after pH adjustment is 5, 6 and 7, and it is particularly preferable that the pH value is 6.

According to the above experimental example, the addition amount of the inorganic flocculant Y2 is set to 4000 cc / m 3 , the addition amount of the polymer flocculant Y4 is set to 3500 cc / m 3, and the pH value of the raw water X1 after pH adjustment is set to 6. It turned out to be preferable. As described above, in the raw water X1, the total solids were 7725 mg / l, the floating solids were 1393 mg / l, and the organic matter concentration (COD) was 1571 mg / l. Then, in the treated water X2, the total solid was 7098 mg / l, the floating solid was 62 mg / l, and the organic matter concentration (COD) was 492 mg / l. Further, as can be seen from this experimental example, the addition amount of the inorganic flocculant Y2 is 4000 cc / m 3 , the addition amount of the polymer flocculant Y4 is 3500 cc / m 3, and the pH value of the raw water X1 after pH adjustment is 6 In particular, suspended solids in the raw water X1 can be reduced.
In this experimental example, when the protein concentration of the raw water X1 is 6200 ppm (total nitrogen concentration 1000 ppm), it is known that the addition amount of the antifoaming agent is preferably 10.7 ppm.

  The preferred embodiments of the pressurized levitation apparatus and the pressurized levitation method according to the present invention have been described above with reference to the accompanying drawings. Needless to say, the present invention is not limited to the above embodiments. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above-described embodiment, as raw water X1, a mixed solution of a secondary decanter juice and a deproteinization treatment solution, which is a treatment solution obtained by deproteinizing the primary decanter juice in the process of producing potato starch, or The configuration using waste water obtained by mixing diluted water and methane fermentation treatment liquid (drainage obtained when methane fermentation of the recovered protein obtained by deproteinizing the primary decanter juice) with this mixed liquid has been described.
However, the present invention is not limited to this, and the effect can be exhibited by using a liquid containing at least a protein and suspended solids as raw water.

It is a flowchart which shows schematic structure of the pressurization levitation apparatus which is one Embodiment of this invention. It is a table | surface for comparing the result at the time of changing the addition amount of an inorganic flocculant in the pressurization floating apparatus which is one Embodiment of this invention. It is a table | surface for comparing the result at the time of changing the addition amount of a polymer flocculent in the pressurization floating apparatus which is one Embodiment of this invention. It is a table | surface for comparing the result at the time of changing the pH value of the raw | natural water after pH adjustment in the pressurization floating apparatus which is one Embodiment of this invention.

Explanation of symbols

  S1 ... Pressure levitation device, 1 ... Rapid stirring tank, 2 ... Defoaming agent supply part, 3 ... Slow stirring tank, 4 ... Pressure water supply part, 5 ... Floating cell (separation part), 6 ... treated water tank, 7 ... floss tank, X1 ... raw water, X2 ... treated water, X3 ... pressurized water, X4 ... floating floss, Y1 ... pH adjuster, Y2 ... inorganic flocculant, Y3 ... Antifoaming agent, Y4 ... polymer flocculant

Claims (14)

  1. A rapid stirring tank for producing fine solids in the raw water by adding a pH adjuster and an inorganic flocculant to the raw water containing protein and floating solids, which are wastewater generated when producing potato starch, and stirring. And a slow stirring tank for agglomerating flocs by aggregating the fine solids by adding a polymer flocculant to the raw water from which the fine solids were produced and stirring, and containing the agglomerated flocs Pressurized flotation comprising a pressurized water supply unit that supplies pressurized water in which a gas is dissolved in the raw water, and a separation unit that separates the raw water into a solid component and a liquid component by releasing the pressure of the raw water supplied with the pressurized water. A device,
    With an antifoaming agent supplying means for supplying an antifoaming agent to the raw water before being supplied to the rapid stirring tank,
    The raw water, the pH adjuster and the inorganic flocculant are supplied below the liquid level of the raw water stored in the rapid stirring tank,
    The polymer flocculant is supplied below the level of the raw water stored in the slow stirring tank ,
    The antifoaming agent is added under pressure, wherein the protein concentration of the raw water is 10.7 ppm per 6200 ppm .
  2. The use of a poly-iron solution as an inorganic flocculant, floatation on device according to claim 1, characterized in that the addition amount of the inorganic flocculant and 4000cc / m 3 ~6000cc / m 3 .
  3. The pressurized levitation apparatus according to claim 2, wherein the amount of the inorganic flocculant added is 4000 cc / m 3 .
  4. As the polymer flocculant, a cationic / anionic amphoteric polymer containing polyacrylamide as a main component is used. The amount of the polymer flocculant added is 3000 cc / m 3 to 5000 cc / m 3 and the concentration is 0.15 wt%. the dissolved-air flotation device according to any one of claims 1 to 3, characterized in that a.
  5. The pressurized levitation apparatus according to claim 4, wherein the amount of the polymer flocculant added is 3500 cc / m 3 .
  6. The pressurized levitation apparatus according to any one of claims 1 to 5 , wherein the pH value of the raw water is set to 5 to 7 by adding the pH adjuster to the raw water.
  7. The raw water floatation on device according to claim 6, characterized in that the pH value is 6.
  8. A rapid stirring process for producing fine solids in the raw water by adding a pH adjuster and an inorganic flocculant to the raw water containing protein and floating solids, which are wastewater generated when producing potato starch, and stirring And a slow stirring step for aggregating the fine solids to agglomerate flock by adding a polymer flocculant to the raw water in which the fine solids are produced and stirring, and containing the agglomerated flocs Pressurized flotation comprising a pressurized water supply step of supplying pressurized water in which a gas is dissolved in the raw water, and a separation step of separating the raw water into a solid component and a liquid component by releasing the pressure of the raw water supplied with the pressurized water. A method,
    While having a defoamer supply step of supplying a defoamer to the raw water before being subjected to the rapid stirring step,
    The raw water, the pH adjuster and the inorganic flocculant are supplied below the liquid level of the raw water stored in the rapid stirring step,
    The polymer flocculant is supplied below the level of the raw water stored in the slow stirring step ,
    The method of adding pressure to the antifoaming agent is characterized in that the protein concentration of the raw water is 10.7 ppm per 6200 ppm .
  9. The use of a poly-iron solution as an inorganic flocculant, floatation on method of claim 8, wherein the amount of addition of the inorganic coagulant and 4000cc / m 3 ~6000cc / m 3 .
  10. The pressurized levitation method according to claim 9, wherein the amount of the inorganic flocculant added is 4000 cc / m 3 .
  11. As the polymer flocculant, a cationic / anionic amphoteric polymer containing polyacrylamide as a main component is used. The amount of the polymer flocculant added is 3000 cc / m 3 to 5000 cc / m 3 and the concentration is 0.15 wt%. The pressurized levitation method according to any one of claims 8 to 10 , wherein:
  12. The pressurized levitation method according to claim 11, wherein the amount of the polymer flocculant added is 3500 cc / m 3 .
  13. The pressurized levitation method according to any one of claims 8 to 12 , wherein the pH value of the raw water is set to 5 to 7 by adding the pH adjuster to the raw water.
  14. 14. The pressurized levitation method according to claim 13, wherein the raw water has a pH value of 6.
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US7718408B2 (en) 2003-12-24 2010-05-18 Danisco A/S Method
US7718204B2 (en) 1998-07-21 2010-05-18 Danisco A/S Foodstuff
US7807398B2 (en) 2003-01-17 2010-10-05 Danisco A/S Method of using lipid acyltransferase
US7906307B2 (en) 2003-12-24 2011-03-15 Danisco A/S Variant lipid acyltransferases and methods of making
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US8163315B2 (en) 1998-07-21 2012-04-24 Danisco A/S Foodstuff
US7718204B2 (en) 1998-07-21 2010-05-18 Danisco A/S Foodstuff
US7781001B2 (en) 1998-07-21 2010-08-24 Danisco A/S Foodstuff
US7972638B2 (en) 1998-07-21 2011-07-05 Danisco A/S Foodstuff
USRE43135E1 (en) 2001-05-18 2012-01-24 Danisco A/S Method of improving dough and bread quality
US8278062B2 (en) 2003-01-14 2012-10-02 Dupont Nutrition Biosciences Aps Method of using lipid acyltransferase
US7955814B2 (en) 2003-01-17 2011-06-07 Danisco A/S Method
US7955813B2 (en) 2003-01-17 2011-06-07 Danisco, A/S Method of using lipid acyltransferase
US8003095B2 (en) 2003-01-17 2011-08-23 Danisco A/S Method of using lipid acyltransferase
US7807398B2 (en) 2003-01-17 2010-10-05 Danisco A/S Method of using lipid acyltransferase
US7906307B2 (en) 2003-12-24 2011-03-15 Danisco A/S Variant lipid acyltransferases and methods of making
US8030044B2 (en) 2003-12-24 2011-10-04 Danisco A/S Lipid acyltransferases
US7718408B2 (en) 2003-12-24 2010-05-18 Danisco A/S Method
US8440435B2 (en) 2003-12-24 2013-05-14 Dupont Nutrition Biosciences Aps Method for reducing 1,2-diglyceride content of an edible oil
US8012732B2 (en) 2004-03-12 2011-09-06 Danisco A/S Fungal lypolytic and amylase enzyme composition and methods using the same
US7666618B2 (en) 2004-07-16 2010-02-23 Danisco A/S Lipolytic enzyme: uses thereof in the food industry
US8192782B2 (en) 2004-07-16 2012-06-05 Danisco A/S Enzymatic oil-degumming method
US8535900B2 (en) 2004-07-16 2013-09-17 Dupont Nutrition Biosciences Aps Lipolytic enzyme uses thereof in the food industry
US8889371B2 (en) 2004-07-16 2014-11-18 Dupont Nutrition Biosciences Aps Lipolytic enzyme: uses thereof in the food industry
US7960150B2 (en) 2007-01-25 2011-06-14 Danisco A/S Production of a lipid acyltransferase from transformed Bacillus licheniformis cells
US8652809B2 (en) 2007-08-17 2014-02-18 Dupont Nutrition Biosciences Aps Method for producing ultra-heat treatment milk

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