Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1994-06-10
1996-05-21
McCarthy, Neil
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210906, 252175, 4231575, 423158, 423140, 423311, C02F 152
Patent
active
055186319
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The present invention relates to a dephosphorizing material for effectively removing phosphorus component in sewages, rivers and the like, and to an easy and convenient method of dephosphorization using such dephosphorizing material.
BACKGROUND ART
Various discussions have hitherto been made as to a dephosphorizing process in sewages, rivers and the like, and pilot experiments have been made in various parts of the country. For example, a method of contact dephosphorization is known, wherein water containing phosphorus is controlled under appropriate conditions to bring into contact with a compound of same species and same system consisting of calcium phosphate, and calcium phosphate (hydroxy apatite) is formed and crystallized on the compound.
In the contact dephosphorization method, the concentration of the phosphorus component in water can be lowered effectively. However, since the phosphorus-containing water requires pH adjustment by a decarboxylating process or addition of lime in order to control such crystallizing reaction, and such control should be made all the time, this method has a drawback to complicate the process. Therefore, the development is desired of a method for effectively removing phosphorus which is economically superior as well as easy and convenient, and of dephosphorizing material which can be used in such a method.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a novel dephosphorizing material which can remove a phosphorus component effectively in sewages, rivers and the like as well as decrease the amount of iron rust.
It is another object of the present invention to provide a dephosphorizing method wherein a phosphorus component can be readily removed in sewages, rivers and the like without special control or the like.
In accordance with the present invention, there is provided a dephosphorizing :material characterized in that a material containing iron as a main component and a calcium compound material are arranged to contact a phosphorus-containing aqueous solution, and in that a water permeable material is provided at least around said material containing iron as a main component.
In accordance with the present invention, there is also provided a method of dephosphorization characterized in that the aforementioned dephosphorizing material is brought into contact with the phosphorus-containing aqueous solution.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial perspective view depicting a dephosphorizing material produced in Example 1.
FIG. 2 is a graph showing chronological change of the phosphorus concentration by a phosphorus-molybdenum oxidization method for measuring the dephosphorizing effect of the dephosphorizing material produced in Example 1.
THE BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is explained further in detail hereinbelow.
In the present dephosphorizing material, a material containing iron as a main component and a calcium compound material are arranged to contact a phosphorus-containing solution, and a water permeable material is provided at least around the above-mentioned material containing iron as a main component. By bringing such dephosphorizing material into contact with a phosphorus-containing aqueous solution, the phosphorus-containing solution reacts with the material containing iron as a main component and the calcium compound material to fix the phosphorus component on the surface of the water permeable material and the like as Fe(PO.sub.4).sub.2.8H.sub.2 O (vivianite) and/or Ca.sub.5 (PO.sub.4).sub.3 0H (hydroxy apatite). At this time, the water permeable material in the dephosphorizing material acts to decrease the outflow of the iron rust and remove the iron eluate with the calcium compound material by providing the water permeable material at least around the material containing iron as a main component.
The material containing iron as a main component may include, for example, iron powers, iron reinforcing bars, iron plates, iron fibers, Fe.sub.2 O.sub.3, F
REFERENCES:
patent: 3499837 (1970-03-01), Jaunarajs
patent: 5008224 (1991-04-01), Watanabe et al.
Hazama Corporation
McCarthy Neil
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