JP4239502B2 - Phosphorus recovery method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a phosphorus recovery device for removing phosphorus components (phosphoric acid, phosphate) from phosphorus-containing water such as sewage, rivers, lakes and marshes using iron-based, alumina-based, and zeolite-based dephosphorization materials, and The present invention relates to a phosphorus recovery method.
[0002]
[Prior art]
Conventionally, when this type of phosphorus removal is performed, the phosphorus component is recovered by a fixed bed method or an expanded bed method, or the phosphorus component is coagulated and removed.
[0003]
[Problems to be solved by the invention]
However, in the fixed bed system and the expanded bed system, the volumetric efficiency is poor, and when the phosphorus component is coagulated and removed, the phosphorus component is difficult to reuse.
[0004]
In view of such circumstances, an object of the present invention is to provide a phosphorus recovery apparatus and a phosphorus recovery method that have high volumetric efficiency and that can easily reuse a phosphorus component.
[0005]
[Means for Solving the Problems]
First, in the present invention described in claim 1 , phosphorus-containing water is stored in a cylindrical reaction tank in which a dephosphorization material mainly composed of calcium silicate hydrate is stored, and the reaction tank is rotated. Is passed through the reaction tank, and the path of the phosphorus-containing water in the reaction tank is meandered by a partition plate . By adopting such a configuration , the residence time in the reaction tank of phosphorus-containing water acts so as to become longer due to the presence of the partition plate. For this reason, if phosphorus-containing water is passed through the reaction tank while the reaction tank is rotated, the phosphorus component of the phosphorus-containing water causes a chemical reaction with the dephosphorizing material in the reaction tank, and is removed as calcium phosphate hydrate. Crystallization on the surface of the phosphorus material and the recovery of the calcium phosphate hydrate act so that it can be reused as a raw material for agricultural fertilizer and phosphate industry.
[0006]
Further, the invention of claim 2 is constructed by the phosphorous-containing water is passed through to the reaction tank in a state of being immersed in the reaction vessel. With this configuration, less power is required to rotate the reaction tank, and solar power generation can be used as the power source.
[0009]
Moreover, when the pH of phosphorus containing water is adjusted , the removal rate of a phosphorus component can be raised irrespective of the kind of phosphorus containing water.
[0010]
In addition, a granular material having a particle diameter of 1 to 4 mm can be adopted as the phosphorus removal material .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of a phosphorus recovery apparatus according to the present invention.
[0012]
As shown in FIG. 1, this phosphorus recovery apparatus 1 has a machine body 2, and a horizontal cylindrical reaction tank 3 is rotatably provided by a motor 4 on the machine body 2. That is, cylindrical inlet side communication pipes 5 and outlet side communication pipes 6 are attached to both end faces of the reaction tank 3, and these inlet side communication pipes 5 and outlet side communication pipes 6 are connected via bearings 7 and 8. Supported by the airframe 2. Further, a pulley 9 is fitted to the inlet side communication pipe 5. On the other hand, a motor 4 is mounted on the machine body 2, and a pulley 10 is fitted on a rotation shaft of the motor 4. A belt 11 is stretched between the pulleys 9 and 10. Therefore, by driving the motor 4, the reaction tank 3 can be rotated together with the inlet side communication pipe 5 and the outlet side communication pipe 6 via the pulley 9, the belt 11, and the pulley 10.
[0013]
In addition, as shown in FIG. 1, an S-shaped cylindrical inlet-side water conduit 12 is provided in the reaction tank 3 so as to be connected to the inlet-side communication pipe 5, and an S-shaped cylindrical outlet is provided. The side water conduit 13 is provided in a form connected to the outlet side communication pipe 6. Here, since the inlet side conduit pipe 12 is fixed to the inlet side communication pipe 5, it rotates simultaneously with the rotation of the reaction tank 3. On the other hand, the outlet side conduit pipe 13 is rotatably connected to the outlet side communication pipe 6 and is always located on the upper side regardless of the rotation of the reaction tank 3. Furthermore, a plurality of (four in FIG. 1) partition plates 15 are arranged in the reaction tank 3 so as to be alternately arranged, and have a particle diameter of 1 to 4 mm mainly composed of calcium silicate hydrate. A granular dephosphorization material is stored in the reaction vessel 3.
[0014]
Since the phosphorus collection | recovery apparatus 1 has the above structures, when using this phosphorus collection | recovery apparatus 1 and removing phosphorus components from phosphorus containing water, such as a sewage, a river, and a lake, it follows by the following procedure. That is, after connecting a water supply hose (not shown) to the inlet side communication pipe 5 of the phosphorus recovery apparatus 1 via a swivel joint (not shown), the motor 4 is driven to set the reaction tank 3 to a predetermined number of revolutions ( For example, a water supply pump (not shown) is driven in a state of being rotated at a speed of 12 minutes to 1 hour per rotation), and phosphorus-containing water is fed into the reaction tank 3 from the water supply hose through the inlet side communication pipe 5. Supply. Then, this phosphorus-containing water is discharged into the reaction tank 3 from the inlet side conduit 12, and proceeds in the reaction tank 3 toward the outlet side conduit 13 (leftward in FIG. 1) while the path is meandered by the partition plate 15. Thereafter, the water is discharged from the outlet side conduit 13 through the outlet side communication pipe 6 to the outside of the reaction tank 3. Meanwhile, the phosphorus component of the phosphorus-containing water causes a chemical reaction with the dephosphorization material in the reaction tank 3 and crystallizes on the surface of the dephosphorization material as calcium phosphate hydrate. It will be discharged after being removed inside. At this time, in addition to rotation of the reaction tank 3 in which the chemical reaction of phosphorus-containing water occurs, the residence time in the reaction tank 3 of phosphorus-containing water becomes longer due to the presence of the partition plate 15, so Removal is performed efficiently and uniformly, and is excellent in volumetric efficiency.
[0015]
Depending on the type (characteristics) of phosphorus-containing water, the phosphorus component removal rate can also be increased by adjusting the pH before supplying phosphorus-containing water into the reaction tank 3 or in the reaction tank 3. .
[0016]
Further, if the removal of the phosphorus component with the dephosphorizing material is continued in this manner, the calcium phosphate hydrate is crystallized one after another on the surface of the dephosphorizing material. Is rotated at a high speed (for example, 30 seconds to 3 minutes / 1 rotation), the calcium phosphate hydrate crystallized on the surface of the dephosphorization material is peeled off, and the performance of the dephosphorization material can be recovered. And if this calcium phosphate hydrate is collected in a separate circuit, it can be reused as a raw material for agricultural fertilizer and phosphate industry, so it is environmentally friendly in that it does not produce industrial waste. In addition, since calcium phosphate hydrate is insoluble, it cannot cause eutrophication even if it is discharged into the river as it is.
[0017]
In the above-described embodiment, the case where the entire phosphorus recovery apparatus 1 is installed on the land has been described. However, depending on the usage location of the phosphorus recovery apparatus 1 and other conditions, the reaction tank 3 may be immersed in water. Conceivable. For example, it is desirable to submerge the reaction tank 3 in places that place importance on the landscape, such as a scenic pond and river in an urban park. In this case, the power for rotating the reaction tank 3, that is, the power consumption of the motor 4 is small, and solar power generation can be used as the power source.
[0018]
【The invention's effect】
As described above, according to the first and second aspects of the present invention, when phosphorus-containing water is passed through the reaction tank while the reaction tank is rotated, the phosphorus component of the phosphorus-containing water is converted into the reaction tank. It causes chemical reaction with the dephosphorization material in the inside, and crystallizes on the surface of the dephosphorization material as calcium phosphate hydrate, and when this calcium phosphate hydrate is recovered, it can be reused as a raw material for agricultural fertilizer and phosphate industry. Therefore, it is possible to provide a phosphorus recovery method that is high in volumetric efficiency and that can easily reuse the phosphorus component.
[0019]
Furthermore, according to the second aspect of the present invention, less power is required to rotate the reaction tank, and solar power generation can be used as the power source. Therefore, the energy saving performance of the phosphorus recovery apparatus can be improved. .
[0021]
In addition, according to the present invention described in claims 1 and 2 , the residence time in the reaction tank of phosphorus-containing water becomes longer due to the presence of the partition plate, so that the phosphorus component can be removed efficiently and uniformly. It becomes.
[0022]
Moreover, since the removal rate of a phosphorus component can be raised regardless of the kind of phosphorus containing water when the pH of phosphorus containing water is adjusted , it becomes possible to improve the versatility of this phosphorus collection | recovery method.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a phosphorus recovery apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Phosphorus recovery apparatus 2 ... Machine body 3 ... Reaction tank 4 ... Motor 5 ... Inlet side communication pipe 6 ... Outlet side communication pipe 7, 8 ... Bearing 9, 10 ... Pulley 11 ... Belt 12 …… Inlet side conduit 13 …… Exit side conduit 15 …… Partition plate

Claims (2)

A dephosphorization material mainly composed of calcium silicate hydrate is stored in a cylindrical reaction tank, and phosphorus-containing water is passed through the reaction tank while the reaction tank is rotated, and the reaction A phosphorus recovery method characterized in that the path of the phosphorus-containing water in the tank is meandered by a partition plate . The phosphorus recovery method according to claim 1, wherein the phosphorus-containing water is passed through the reaction tank while the reaction tank is submerged .

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