阅读说明：本技术 有机性污泥的处理设备及处理方法 (Treatment equipment and treatment method for organic sludge ) 是由 倭常郎 于 2020-01-23 设计创作，主要内容包括：一种有机性污泥的处理设备,该处理设备具备对有机性污泥进行脱水的脱水机构(3),其中,在脱水机构(3)中,在壳体(3A)内配置有过滤有机性污泥(D)的过滤网(3B),向由过滤网(3B)划分的壳体(3A)内的2个以上空间中的第1空间(3A1)供给有机性污泥(D),并且从脱水温水供给机构向第2空间(3A2)供给50℃以上且小于100℃的温度的脱水温水(H)。(A treatment facility for organic sludge, which is provided with a dewatering mechanism (3) for dewatering organic sludge, wherein a filter screen (3B) for filtering organic sludge (D) is disposed in a housing (3A) in the dewatering mechanism (3), the organic sludge (D) is supplied to a1 st space (3A1) of 2 or more spaces in the housing (3A) divided by the filter screen (3B), and dewatering warm water (H) at a temperature of 50 ℃ or more and less than 100 ℃ is supplied from a dewatering warm water supply mechanism to a2 nd space (3A 2).)

1. A treatment facility for organic sludge, comprising a dewatering mechanism for dewatering organic sludge,

wherein the dehydration mechanism is provided with a filter screen for filtering the organic sludge in a casing, the organic sludge is supplied to a1 st space of more than 2 spaces in the casing divided by the filter screen, and the dehydration warm water at a temperature of more than 50 ℃ and less than 100 ℃ is supplied from the dehydration warm water supply mechanism to the 2 nd space.

2. The facility for treating organic sludge according to claim 1, wherein the temperature of the dehydrated warm water is in a range of 60 ℃ to 90 ℃.

3. The facility for treating organic sludge according to claim 1 or 2, wherein the dewatering mechanism comprises:

an inner filter screen which is cylindrical or conical with a longitudinally extending axis as a center and is arranged in the shell;

an outer filter screen which is in a cylindrical shape or a conical shape coaxial with the inner filter screen and is arranged in the housing at intervals outside the inner filter screen; and

a spiral band which is twisted around the axis, is accommodated between the inner filter screen and the outer filter screen, and relatively rotates with respect to the inner filter screen and the outer filter screen around the axis,

the space between the inner filter screen and the outer filter screen is the 1 st space, and the space inside the inner filter screen and the space outside the outer filter screen are the 2 nd space.

4. The facility for treating organic sludge according to any one of claims 1 to 3, comprising a thickening mechanism for thickening the organic sludge coagulated by adding a coagulant in a stage prior to the dewatering mechanism, wherein the organic sludge thickened by the thickening mechanism is dewatered by the dewatering mechanism,

wherein the concentrated warm water is supplied from a concentrated warm water supply means to the concentration means in a temperature range of 50 ℃ or higher and less than 100 ℃ and mixed with the organic sludge.

5. The facility for treating organic sludge according to claim 4, wherein the temperature of the concentrated warm water is in a range of 60 ℃ to 90 ℃.

6. The facility for treating organic sludge according to claim 4 or 5, wherein the concentration means concentrates the organic sludge to a sludge concentration of 5 wt% or more.

7. The facility for treating organic sludge according to any one of claims 4 to 6, wherein a flocculant is added to the organic sludge concentrated by the concentration means.

8. The facility for treating organic sludge according to any one of claims 4 to 7, wherein the hot water for dewatering discharged from the dewatering means is circulated and supplied to the concentration means as the hot water for concentration.

9. A method for treating organic sludge, which comprises dehydrating the organic sludge by a dehydration mechanism,

wherein the dehydration mechanism is configured to arrange a filter screen for filtering the organic sludge in a casing, supply the organic sludge to a1 st space in more than 2 spaces in the casing divided by the filter screen, and supply dehydrated warm water with a temperature of more than 50 ℃ and less than 100 ℃ from a dehydrated warm water supply mechanism to the 2 nd space.

10. The method for treating organic sludge according to claim 9, wherein the temperature of the dehydrated warm water is in a range of 60 ℃ to 90 ℃.

11. The method according to claim 9 or 10, wherein the organic sludge coagulated by adding the coagulant is concentrated by a concentrating means, and the organic sludge concentrated by the concentrating means is dewatered by the dewatering means,

wherein the concentrated warm water at a temperature of 50 ℃ or higher and less than 100 ℃ is supplied from a concentrated warm water supply means to the concentration means and mixed with the organic sludge.

12. The method for treating organic sludge according to claim 11, wherein the temperature of the concentrated warm water is in a range of 60 ℃ to 90 ℃.

13. The method of treating organic sludge according to claim 11 or 12, wherein the organic sludge is concentrated by the concentration means to a sludge concentration of 5 wt% or more.

14. The method of treating organic sludge as claimed in any one of claims 11 to 13, wherein a flocculant is added to the organic sludge concentrated by the concentration means.

15. The method of treating organic sludge according to any one of claims 11 to 14, wherein the hot water for dewatering discharged from the dewatering means is circulated and supplied to the thickening means as the hot water for thickening.

[ technical field ] A method for producing a semiconductor device

The present invention relates to an apparatus for treating organic sludge, which includes a dewatering mechanism for dewatering organic sludge such as sewage sludge generated from a sewage treatment plant, and a method for treating organic sludge by dewatering such organic sludge by the dewatering mechanism.

The present application claims priority based on japanese application No. 2019-.

[ background of the invention ]

As a dewatering mechanism used in such an organic sludge treatment facility and treatment method, for example, patent document 1 discloses a dewatering device including an outer cylinder screen having a heated surface and a filtering surface exposed from small holes, the outer cylinder screen having a small hole formed in a peripheral wall thereof, a screw shaft provided inside the outer cylinder screen, and a screw blade provided spirally around the screw shaft, wherein the screw blade and the screw shaft are rotated to compress a dewatering object put into the outer cylinder screen while conveying the object in an axial direction of the screw shaft, and moisture separated from the dewatering object is discharged from the small holes of the outer cylinder screen.

In the filtering apparatus disclosed in patent document 1, a heating jacket having a structure in which a heat medium flows through the inside is attached to a part of the outer cylindrical screen, the part of the outer cylindrical screen to which the heating jacket is attached serves as a heating surface, and the heating surface and the filtering surface are alternately and repeatedly arranged in the axial direction of the screw shaft. In this type of filter device, the object to be dewatered conveyed inside the outer cylindrical screen is dewatered while being heated by the heating surface of the outer cylindrical screen, thereby achieving a reduction in the water content of the dewatered sludge.

[ Prior art documents ]

[ patent document ]

Patent document 1: international publication No. 2017/043232

[ summary of the invention ]

[ technical problem to be solved by the invention ]

However, in the filtering apparatus disclosed in patent document 1, as described above, the portion of the outer cylindrical screen to which the heating jacket is attached is a heating surface, and the heating surface is not provided with small holes separated from the dehydration target such as a filtering surface. Therefore, if the area of the heating surface is increased in order to further reduce the water content of the dewatered sludge, the area of the filtering surface is decreased, and the water separated from the dewatering object cannot be discharged efficiently.

The present invention has been made under such a background, and an object thereof is to provide an apparatus and a method for treating organic sludge, which are provided with a dewatering mechanism capable of achieving both a reduction in the water content by heating the organic sludge and an effective discharge of water separated from the organic sludge.

[ MEANS FOR SOLVING THE PROBLEMS ] to solve the problems

The organic sludge treatment facility of the present invention includes a dewatering mechanism for dewatering organic sludge, wherein a filter screen for filtering the organic sludge is disposed in a casing of the dewatering mechanism, the organic sludge is supplied to a1 st space of 2 or more spaces in the casing partitioned by the filter screen, and dewatering warm water at a temperature of 50 ℃ or more and less than 100 ℃ is supplied from a dewatering warm water supply mechanism to the 2 nd space.

The method for treating organic sludge according to the present invention is a method for treating organic sludge by dehydrating organic sludge by a dehydration mechanism, wherein the dehydration mechanism includes a filter screen for filtering the organic sludge disposed in a casing, the organic sludge is supplied to a1 st space among 2 or more spaces in the casing partitioned by the filter screen, and dehydrated warm water having a temperature in a range of 50 ℃ or more and less than 100 ℃ is supplied from a dehydrated warm water supply mechanism to the 2 nd space.

In the apparatus and method for treating organic sludge configured as described above, in the dewatering mechanism, the organic sludge is supplied to the 1 st space among the 2 or more spaces partitioned by the filter screen disposed in the casing and through which the organic sludge is filtered, and the dewatering hot water at a temperature in the range of 50 ℃ or more and less than 100 ℃ is supplied from the dewatering hot water supply mechanism to the 2 nd space, so that the organic sludge supplied to the 1 st space is heated by the dewatering hot water supplied to the 2 nd space, whereby the viscosity of the organic sludge is lowered, and the water contained in the organic sludge is separated by the thermal denaturation of the protein.

In addition, since the water separated from the organic sludge flows into the 2 nd space through the filter screen and is discharged, the water content of the organic sludge can be reduced. In addition, since the viscosity of the organic sludge decreases and the filtration resistance decreases, the water separated from the organic sludge can be easily discharged. Therefore, according to the organic sludge treatment facility and the organic sludge treatment method configured as described above, the water content of the dewatered organic sludge can be reduced and the water separated from the organic sludge can be effectively discharged.

Here, when the dehydration temperature is lower than 50 ℃, the above-mentioned effects of the reduction in viscosity of the organic sludge and the separation of water cannot be sufficiently obtained. In addition, if the dehydration temperature exceeds 100 ℃, the treatment becomes difficult. The temperature of the dehydrated warm water is preferably in the range of 60 ℃ to 90 ℃. The higher the temperature of the dehydrated warm water, the more the reduction in viscosity of the organic sludge and the separation of water by thermal denaturation of proteins are promoted, but when the warm water used in the treatment facility is used as the dehydrated warm water, a temperature range of 60 ℃ to 90 ℃ is realistic.

In the organic sludge treatment facility according to the present invention, it is preferable that the dewatering mechanism includes:

an inner filter screen which is cylindrical or conical with a longitudinally extending axis as a center and is arranged in the shell;

an outer filter mesh which is in a cylindrical shape or a conical shape coaxial with the inner filter mesh and is provided in the housing at an interval outside the inner filter mesh; and

a spiral belt which is spirally twisted around an axis, is accommodated between the inner strainer and the outer strainer, and relatively rotates with respect to the inner strainer and the outer strainer around the axis;

the space between the inner filter and the outer filter is the 1 st space, and the space inside the inner filter and the space outside the outer filter are the 2 nd space.

In this vertical screw press, the organic sludge supplied to the 1 st space between the inner and outer strainers is dewatered by using these inner and outer strainers as the strainers while the organic sludge is conveyed in the axial direction by the relative rotation of the screw belts, so that the organic sludge supplied to the 1 st space can be heated from the 2 nd spaces inside and outside the 1 st space while a large filtration area is ensured, and the separation of moisture can be promoted more effectively.

Further, the dewatering device may be provided with a thickening device for thickening the organic sludge coagulated by adding the coagulant, and the organic sludge thickened by the thickening device may be dewatered by the dewatering device. In this case, by supplying concentrated warm water having a temperature of 50 ℃ or higher and less than 100 ℃ from the concentrated warm water supply means to the concentration means and mixing the concentrated warm water with the organic sludge, the organic sludge can be heated in the concentration means to thermally denature proteins, thereby separating retained water and further improving the dewatering efficiency in the dewatering means in the subsequent stage.

In the concentration means, the temperature of the concentrated hot water is preferably in the range of 60 ℃ to 90 ℃ for the same reason as the dehydrated hot water supplied to the dehydration means. In order to further improve the dewatering efficiency in the dewatering means at the subsequent stage as described above, the organic sludge is preferably concentrated by the concentration means to a sludge concentration of 5 wt% or more, and more preferably, for example, to a sludge concentration in the range of 8 wt% to 10 wt%. Further, it is preferable to add a flocculant to the organic sludge concentrated by the above-mentioned concentrating means. Preferably, the hot water discharged from the dehydration means is circulated and supplied to the concentration means as the concentrated hot water to be supplied to the concentration means.

[ Effect of the invention ]

As described above, according to the present invention, the organic sludge is heated by the hot water for dehydration in the dehydration means, whereby the water content of the dehydrated organic sludge can be reduced and the water separated from the organic sludge can be efficiently discharged at the same time.

[ description of the drawings ]

FIG. 1 is a schematic view showing an apparatus for treating organic sludge according to embodiment 1 of the present invention.

Fig. 2 is a detailed view of the embodiment shown in fig. 1.

FIG. 3 is a schematic view showing an apparatus for treating organic sludge according to embodiment 2 of the present invention.

FIG. 4 is a schematic view showing an apparatus for treating organic sludge according to embodiment 3 of the present invention.

FIG. 5 is a schematic view showing an apparatus for treating organic sludge according to embodiment 4 of the present invention.

[ detailed description ] embodiments

Fig. 1 and 2 show a1 st embodiment of the organic sludge treatment facility according to the present invention, and the following describes the 1 st embodiment of the organic sludge treatment facility, and also describes a method for treating the organic sludge according to the present invention. The organic sludge treatment facility of the present embodiment includes:

a coagulation mechanism 1 for adding a polymer flocculant B to an organic sludge A such as sewage sludge, for example, mixed raw sludge generated and supplied from a sewage treatment plant, and coagulating the mixture;

a thickening mechanism 2 for thickening the sludge C having the solid content agglomerated to some extent by the agglomerating mechanism 1;

a dewatering mechanism 3 for dewatering the concentrated sludge D concentrated by the concentration mechanism 2; and

and a concentrated sludge supply path 4 connecting the concentration means 2 and the dewatering means 3.

As shown in fig. 2, the coagulation mechanism 1 includes a bottomed cylindrical coagulation tank 1A, and the coagulation tank 1A holds the organic sludge a and the polymer flocculant B supplied from the bottom and has a central axis extending in the longitudinal direction. The coagulation tank 1A is provided with a stirring mechanism 1B, and the stirring mechanism 1B is configured such that a stirring blade 1B is attached to a rotating shaft 1A along the central axis of the coagulation tank 1A, and the rotating shaft 1A and the stirring blade 1B are rotated by a rotation driving mechanism 1c such as a motor provided in the upper part of the coagulation tank 1A, whereby the organic sludge a and the polymer flocculant B are stirred and mixed. The coagulated sludge C coagulated by stirring and mixing with the polymer coagulant B by the stirring mechanism 1B is drawn out from the upper part of the coagulation tank 1A and supplied to the concentration mechanism 2.

The thickening mechanism 2 in the present embodiment is a vertical filtration thickener, and includes a bottomed cylindrical thickening tank 2A, the thickening tank 2A holding the flocculated sludge C supplied from the flocculation mechanism 1, and having a central axis extending in the vertical direction similarly to the thickening tank 1A, and the flocculated sludge C being supplied from the upper part of the thickening tank 2A into the thickening tank 2A. Wherein the main body of the concentration tank 2A is a concentration screen 2A formed of a wedge wire, a punched metal, or the like, and the outer periphery of the concentration screen 2A is a jacket-shaped filtrate chamber 2 b.

The thickening tank 2A is provided with a conveying mechanism 2B, a screw 2d is attached to a rotating shaft 2C along the central axis of the thickening tank 2A, and the rotating shaft 2C and the screw 2d are rotated by a rotary driving mechanism 2e such as a motor provided at the upper portion of the thickening tank 2A to convey the flocculated sludge C. The flocculated sludge C supplied from the upper part of the thickening tank 2A is concentrated by separating water by the thickening strainer 2A while being conveyed downward by the conveying mechanism 2B, is thickened to a sludge concentration of 5 wt% or more, preferably to a sludge concentration range of 8 wt% to 10 wt%, is extracted from the bottom of the thickening tank 2A, and is supplied to the thickened sludge supply line 4 as thickened sludge D.

The bottoms of the thickener tank 2A and the coagulation tank 1A are formed in a truncated cone shape whose diameter decreases downward. The moisture separated from the flocculated sludge C by the thickening screen 2a is stored in the filtrate chamber 2b and treated as the drain water E.

Further, in embodiment 1, the concentrated warm water F having a temperature in the range of 50 ℃ to less than 100 ℃, preferably 60 ℃ to 90 ℃ is supplied to the concentration mechanism 2 from a concentrated warm water supply mechanism not shown by a pump 2C and mixed with the flocculated sludge C supplied from the flocculation mechanism 1.

Here, the rotary shaft 2c of the transport mechanism 2B of the concentration mechanism 2 is hollow and cylindrical, and a plurality of (2 or more) through holes are formed in the cylindrical wall portion of the rotary shaft 2 c. The concentrated hot water F is supplied into the rotary shaft 2C from the lower end of the rotary shaft 2C and is discharged from the through-hole, and is supplied to and mixed with the flocculated sludge C supplied from the flocculation mechanism 1 and stored in the concentration tank 2A.

Thus, in the present embodiment, in the concentration mechanism 2, the flocculated sludge C is heated to thermally denature the protein, the retained water is separated and discharged as the drain water E together with the concentrated warm water F, and the concentrated sludge D is concentrated to the above-described concentration.

In the concentrated sludge supply path 4 to which the concentrated sludge D concentrated in this manner is supplied, a pump 4A that sends out the concentrated sludge D to the dewatering mechanism 3 is provided, and a mixing mechanism 4B such as a high-speed mixer is provided between the pump 4A and the dewatering mechanism 3. In the mixing means 4B, an inorganic flocculant such as ferric Polysulfate (PFS) or a flocculant G such as a polymer flocculant is supplied by a pump 4C, and added to and mixed with the concentrated sludge D.

In the dewatering mechanism 3 to which the concentrated sludge D added and mixed with the flocculant G in this way is supplied, the strainer 3B for filtering the concentrated sludge D is disposed in the casing 3A, and the concentrated sludge D is supplied to the 1 st space 3A1 of 2 or more spaces in the casing 3A partitioned by the strainer 3B.

Here, the dewatering mechanism 3 in the present embodiment is a vertical screw press, and includes:

an inner screen 3A, which is the screen 3B of the 2 nd screen 3B, is disposed in the housing 3A in a cylindrical or conical shape centered on an axis extending in the longitudinal direction and coaxial with the housing 3A;

an outer screen 3b which is cylindrical or conical and coaxial with the inner screen 3A, and which is disposed inside the housing 3A at an interval outside the inner screen 3A; and

and a spiral belt 3d which is spirally twisted around the axis, is accommodated between the inner strainer 3a and the outer strainer 3b, and is relatively rotated with respect to the inner strainer 3a and the outer strainer 3b around the axis by a rotation driving mechanism 3c such as a motor.

The space between the inner screen 3A and the outer screen 3b is the 1 st space 3A1 to which the concentrated sludge D is supplied, and the space inside the inner screen 3A and the space inside the housing 3A outside the outer screen 3b are the 2 nd space 3A2, and the dehydrated warm water H having a temperature in the range of 50 ℃ or more and less than 100 ℃, preferably 60 ℃ or more and 90 ℃ or less is supplied to the 2 nd space 3A2 by a pump 3P from a dehydrated warm water supply mechanism not shown. The inner filter mesh 3a and the outer filter mesh 3b are also formed of wedge wires, punched metal, or the like.

The casing 3A is a bottomed cylindrical shape centered on the axis, and the concentrated sludge D is supplied from the bottom of the casing 3A to the 1 st space 3A1 through a supply pipe 3f connected to a connection plate 3e in the form of a circular ring plate connecting the bottoms of the inner strainer 3A and the outer strainer 3b, and is separated from water by the inner strainer 3A and the outer strainer 3b while being conveyed upward by the relative rotation of the screw belt 3D.

Further, an annular plate-shaped substrate 3C is provided at an upper portion in the housing 3A, and the outer screen 3b is attached and fixed to an inner peripheral portion of the substrate 3C. A lid 3D is provided at an upper opening of the case 3A above the substrate 3C, the inner screen 3A is fixed to the lid 3D, and the rotation driving mechanism 3C is disposed on the lid 3D to rotate the spiral belt 3D by a cylindrical spiral support body covering an upper portion of the inner screen 3A. In the present embodiment, the inner screen 3a and the outer screen 3b are fixed to the housing, and the screw belt 3d is rotationally driven by the rotational drive mechanism 3c, but the screw belt 3d may be fixed in reverse to rotate the inner screen 3a and the outer screen 3b, or the screw belt 3d and the inner screen 3a and the outer screen 3b may be rotated in opposite directions to each other.

Further, the space in the upper portion of the housing 3A between the substrate 3C and the lid 3D serves as a discharge chamber 3E, and the annular upper opening portion of the 1 st space 3A1 in the discharge chamber 3E serves as a discharge port 3F, and a pressing ring 3G having a truncated conical outer peripheral surface centered on the axis is provided in the discharge port 3F, the pressing ring 3G facing upward toward the outer peripheral side. The water is separated and dewatered from the concentrated sludge D while being conveyed upward by the spiral belt 3D in the 1 st space 3a1, and the obtained dewatered sludge I flows out to the discharge chamber 3E from the discharge port 3F while being pressed by the press ring 3G and is discharged.

In the present embodiment, the hot dehydrated water H is also supplied from the bottom of the casing 3A to the 2 nd space 3A2 in the casing 3A. The dehydrated warm water H supplied to the 2 nd space 3a2 heats the concentrated sludge D in the 1 st space 3a1, and the protein of the concentrated sludge D is thermally denatured, so that the water retained therein is separated and filtered by the inner strainer 3a and the outer strainer 3b, and the dehydrated warm water H cooled by heating the concentrated sludge D is discharged as the drain water J from the drain pipe 3H extending from the 2 nd space 3a 2.

In the organic sludge treatment facility and the treatment method configured as above, in the dewatering mechanism 3, the concentrated sludge D is supplied to the 1 st space 3A1 of the 2 or more spaces partitioned by the filter screen 3B disposed in the casing 3A and filtering the concentrated sludge D, and the dewatering warm water H having a temperature in the range of 50 ℃ or more and less than 100 ℃ is supplied from the dewatering warm water supply mechanism to the 2 nd space 3A 2. Then, the concentrated sludge D supplied to the 1 st space 3a1 is heated by the dehydrated warm water H supplied to the 2 nd space 3a2 in this manner, so that the viscosity of the concentrated sludge D is lowered, and the water retained in the concentrated sludge D is separated by thermal denaturation of proteins.

The water separated from the concentrated sludge D is filtered by the filter screen 3B and flows into the 2 nd space 3a2, and is discharged together with the cooled hot dehydrated water H, so that the water content of the dehydrated sludge I discharged from the discharge port 3F to the discharge chamber 3E can be reduced. Further, as described above, since the viscosity of the concentrated sludge D is decreased and the filtration resistance is decreased, the moisture separated from the concentrated sludge D can be easily discharged to the 2 nd space 3a 2. Therefore, according to the organic sludge treatment facility and the organic sludge treatment method configured as described above, the water content of the dewatered sludge I can be reduced and the water separated from the concentrated sludge D can be efficiently discharged at the same time.

As the dehydrated warm water H and the concentrated warm water F, drain water from a flue gas treatment tower of a sludge incineration facility provided in an organic sludge treatment facility, drain water from a scrubber of a sludge drying facility, or warm water generated by a digestion gas generator can be used. Further, the water may be used by heating water with a boiler or filtering sand water.

Here, if the temperature of the hot dewatered water H is lower than 50 ℃, the above-described effects of the viscosity reduction and the moisture separation of the concentrated sludge D cannot be sufficiently obtained. In addition, when the temperature of the dehydrated warm water H exceeds 100 ℃, the treatment becomes difficult. It should be noted that the higher the temperature of the dehydrated warm water H, the more the viscosity reduction of the concentrated sludge D and the moisture separation due to the thermal denaturation of the protein can be promoted, but when the warm water used in the facility for treating the organic sludge is used as the dehydrated warm water H as described above, a temperature range of 60 ℃ to 90 ℃ is realistic.

In the treatment facility of the present embodiment, the dewatering mechanism 3 is a vertical screw press, and includes:

an inner filter mesh 3A which is cylindrical or conical with an axis extending in the longitudinal direction as the center and is provided in the housing 3A;

an outer screen 3b which is cylindrical or conical and coaxial with the inner screen 3A, and which is provided inside the housing 3A at an interval outside the inner screen 3A; and

and a spiral band 3d that is spirally twisted around the axis, is accommodated between the inner strainer 3a and the outer strainer 3b, and relatively rotates with respect to the inner strainer 3a and the outer strainer 3b around the axis.

The space between the inner screen 3a and the outer screen 3B as the screen 3B is the 1 st space 3a1 to which the concentrated sludge D is supplied, and the space inside the inner screen 3a and the space outside the outer screen 3B are the 2 nd space 3a2 to which the dehydrated warm water H is supplied.

In the vertical screw press having such a configuration, the concentrated sludge D supplied to the 1 st space 3a1 between the inner screen 3a and the outer screen 3b is dewatered by the inner screen 3a and the outer screen 3b while being conveyed in the axial direction by the relative rotation of the screw belt 3D, and therefore, a large filtration area can be secured, and more effective filtration can be realized. In addition, since the concentrated sludge D supplied to the 1 st space 3a1 can be heated by the dehydrated warm water H supplied to the 2 nd space 3a2 inside and outside the 1 st space 3a1, the separation of moisture caused by thermal denaturation of proteins can also be more effectively promoted. It is preferable that 80% or more of the filtration surface of the inner filter web 3a and the outer filter web 3b is in direct contact with the hot water H for dehydration all the time. Thus, in the dewatering process of the concentrated sludge D, the concentrated sludge D supplied to the 1 st space 3a1 through the strainer can be sufficiently heated, and the separation of water by the thermal denaturation of protein can be more effectively promoted. Further, since the filter surface is always in direct contact with the hot dehydrated water H, the filter surface does not come into contact with the atmosphere, and clogging due to drying of the filter surface can be prevented.

In the present embodiment, a vertical screw press having two screens 3B, i.e., the inner screen 3a and the outer screen 3B, is used as the dewatering mechanism 3, but a vertical screw press having a cylindrical or conical screen centered on a longitudinally extending axis and a screw provided in a spiral shape twisted around the axis and rotating around the axis, or a horizontal screw press disclosed in patent document 1 may be used. Alternatively, a rotary press or a multiple plate type screw press may be used.

Further, in the present embodiment, a thickening mechanism 2 is provided in a stage preceding the dewatering mechanism 3, the thickening mechanism 2 thickens the flocculated sludge C flocculated by adding the polymer flocculant B to the organic sludge a in the flocculating mechanism 1, and the thickened sludge D thickened by the thickening mechanism 2 is dewatered by the dewatering mechanism 3.

The concentrated hot water F having a temperature in the range of 50 ℃ or higher and less than 100 ℃ is also supplied from the concentrated hot water supply means to the concentration means 2 and mixed with the flocculated sludge C. Therefore, the condensed sludge C can be heated and the protein can be thermally denatured in the concentration mechanism 2 at the front stage of the dewatering mechanism 3, and the moisture held by the condensed sludge C can be separated, thereby further improving the dewatering efficiency in the dewatering mechanism 3 at the rear stage.

Further, since the coagulation inhibitor contained in the liquid of the coagulated sludge C can be replaced in the concentrated hot water F by mixing the concentrated hot water F and the coagulated sludge C in the concentration means 2 in this manner, the flocculant G such as ferric polysulfate added to the concentrated sludge supply passage 4 can be prevented from being consumed by the coagulation inhibitor, and the flocculant G can be efficiently reacted with the solid content of the concentrated sludge D. Further, by heating the flocculated sludge C with the concentrated hot water F, the reactivity of the flocculant G with the concentrated sludge D can be improved, and the amount of the flocculant G added can be reduced.

In the concentration mechanism 2, if the temperature of the concentrated hot water F is lower than 50 ℃, the dehydration efficiency in the dehydration mechanism 3 may not be reliably improved, and if the temperature of the concentrated hot water F is 100 ℃ or higher, the operability of the concentrated hot water F may be impaired. The temperature of the concentrated warm water F is preferably in the range of 60 ℃ to 90 ℃. Further, in order to further improve the dewatering efficiency in the dewatering means 3 at the subsequent stage of the thickening means 2, the sludge concentration of the thickened sludge D thickened by the thickening means 2 is preferably thickened to 5 wt% or more, and more preferably to a range of 8 wt% to 10 wt% of the sludge concentration.

In the present embodiment, the thickening mechanism 2 is a vertical filtration thickener provided with a conveying mechanism 2B, and the conveying mechanism 2B conveys the flocculated sludge C by attaching a screw 2d to a rotary shaft 2C along the central axis of the thickening tank 2A extending in the longitudinal direction and rotating the rotary shaft 2C and the screw 2d by a rotary drive mechanism 2e, but a belt thickener, a drum thickener, or a honeycomb thickener may be used, for example, as long as the thickener does not break the flocculated sludge C other than the centrifugal thickener which breaks the flocculated sludge C.

It should be noted that, in embodiment 1, the concentrated hot water F is added to and mixed with the flocculated sludge C in the concentration means 2 as described above, but the concentrated hot water F may not be supplied to the concentration means 2 as in embodiment 2 of the present invention schematically shown in fig. 3. In fig. 3 to 5, the same reference numerals are given to the same parts as those in the schematic view shown in fig. 1.

In embodiment 2, for example, organic sludge A having a sludge concentration of 2 wt% and a sludge temperature of 25 ℃ is set to 10m³[ solution ] supplied to a coagulation means 1, and the coagulated sludge C thus coagulated is supplied to a concentration means 2, and in the concentration means 2, 7.5m is separated at 25 ℃ in the same manner³A drain (separated liquid) E of 8 wt% in sludge concentration and a concentrated sludge D of 2.5m at 25 DEG C³When supplied to the dewatering means 3, the hot water H for dewatering at 80 ℃ is set to 4.4m³The water is supplied to a dewatering means 3, and the drain water (separated water) J at 60 ℃ is supplied at (1.7+4.4) m³The sludge concentration is 25 wt%, and the dewatered sludge I at 60 ℃ can be discharged at 0.8m³And/h is discharged.

In addition, although the condensed sludge C condensed by the condensing means 1 is condensed by the condensing means 2 and then supplied to the dewatering means 3 in the above embodiments 1 and 2, the condensed sludge C may be directly supplied to the dewatering means 3 without providing the condensing means 2 as in the embodiment 3 of the present invention shown in fig. 4, for example.

However, in this case, similarly to embodiment 2, the organic sludge A having a sludge concentration of 2 wt% and a sludge temperature of 25 ℃ is 10m³[ case ] when the sludge C is supplied to the coagulation section 1 and the coagulated sludge C is directly supplied to the dewatering section 3, the amount of the sludge C is 0.8m in the same manner as in embodiment 2³The concentration of the discharged sludge I is 25 wt%, and the dewatered sludge I at 60 ℃ must be 17.5m³Supply of 80 ℃ dehydrated warm water H to the dehydration mechanism 3 at (9.2+17.5) m³H discharge of 60 ℃ drainage (separation water) J. Therefore, the supply amount of the dewatering warm water h to the dewatering mechanism 3 is about 4 times, and therefore, the concentration mechanism 2 is preferably provided at the front stage of the dewatering mechanism 3.

In addition, although the dewatering warm water H supplied to the dewatering mechanism 3 is discharged as the drain water J in the above embodiment 1, the dewatering warm water discharged from the dewatering mechanism 3 may be recycled by circulating and supplying the water to the concentration mechanism 2 as the circulating and concentrated warm water K as in the embodiment 4 of the present invention schematically shown in fig. 5.

In this case, since the separation liquid discharged from the dewatering mechanism 3 is also contained in the dewatering hot water as the circulating concentrated hot water K discharged from the dewatering mechanism 3, according to embodiment 4, the insoluble solid component (SS) in the separation liquid can be captured by the concentration mechanism 2, and the SS recovery rate can be improved. In addition, since the residual polymer in the separated liquid can be effectively utilized, the performance of the dewatering mechanism 3 can be improved, the temperature of the concentrated sludge D can be further increased, and the dewatering efficiency can be further improved.

[ INDUSTRIAL APPLICABILITY ]

By applying the organic sludge treatment facility of the present application to this field, it is possible to provide an organic sludge treatment facility and treatment method provided with a dewatering mechanism capable of achieving both the reduction in the water content by heating the organic sludge and the effective discharge of the water separated from the organic sludge.

[ notation ] to show

1 agglomeration mechanism

2 concentration mechanism

3 dewatering mechanism

3A casing

3A1 No. 1 space

3A2 space 2

3B filter screen

3a inner filter screen

3b outer filter screen

3c rotary driving mechanism

3d spiral band

4 concentrated sludge supply path

A organic sludge

B Polymer coagulant

C coagulated sludge

D concentrating the sludge

E. J drainage

F concentrated warm water

G coagulant

H-dehydrated warm water

I dewatered sludge

K circulation concentrated warm water