Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1995-11-13
1997-09-09
Nessler, Cynthia L.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210702, 210906, 502406, 423140, C02F 152
Patent
active
056652410
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The present invention relates to a dephosphorizing material capable of effectively removing phosphorus component from a phosphorus-containing aqueous solution in sewerages, rivers, or the like, and to an easy and convenient dephosphorizing method utilizing such dephosphorizing material.
BACKGROUND ART
Various discussions have hitherto been made as to a dephosphorizing process in sewerages, rivers, or the like, and pilot experiments have been conducted in various regions of the country. For example, a contact dephosphorizing method is known, wherein a phosphorus-containing aqueous solution is controlled under appropriate conditions, and contacted with a compound of the same species and same system consisting of calcium phosphate, thereby forming and crystallizing calcium phosphate (hydroxy apatite) on the above compound.
According to the above contact dephosphorizing method, the concentration of the phosphorus component contained in water can be lowered effectively. However, pH of the phosphorus-containing water should be adjusted by a decarboxylating process or addition of lime in order to control such crystallizing reaction, and such control should be done all the time, which causes a drawback of complicating the process. Therefore, there is demanded a development of a method capable of effectively removing phosphorus component with economical superiority, easiness, and convenience, and of a dephosphorizing material usable in such a method.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a novel dephosphorizing material which is capable of effectively removing phosphorus component in a phosphorus-containing aqueous solution in sewerages, rivers, or the like.
It is another object of the present invention to provide a dephosphorizing method which is capable of easily removing phosphorus component in a phosphorus-containing aqueous solution in sewerages, rivers, or the like, without necessity for special controls.
According to the present invention, there is provided a dephosphorizing material characterized in that a fine pore rendering percent water absorption to be not less than 10% is formed therein by solidifying starting materials comprising iron and/or an iron-containing compound, a cementitious material, water, and a mixing agent for accelerating bleeding, while bleeding not less than 2.0% by weight of the water contained in said starting materials.
According to the present invention, there is also provided a dephosphorizing method characterized in that said dephosphorizing material of claim 1 is brought into contact with a phosphorus-containing aqueous solution.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a graph showing chronologically the phosphorus concentrations in a lacustrine phosphorus-containing aqueous solution measured before and after the solution is passed through the dephosphorizing material prepared in Example 1.
FIG. 2 is a graph showing chronologically the phosphorus concentrations in a sewage measured before and after the sewage is brought into contact with the dephosphorizing material prepared in Example 2.
FIG. 3 is a graph showing chronologically the phosphorus concentrations in a lacustrine phosphorus-containing aqueous solution measured before and after the solution is passed through the dephosphorizing material prepared in Example 3.
BEST MODE FOR PRACTICING THE INVENTION
Starting materials of the dephosphorizing material of the present invention include iron and/or an iron-containing compound, a cementitious material, water, and a mixing agent for accelerating bleeding as indispensable materials. The starting materials are solidified while bleeding to form therein fine pores rendering particular percent water absorption.
In solidifying the starting materials while bleeding, the water and the mixing agent for accelerating bleeding among the starting materials act to form fine pores in the dephosphorizing material to be obtained so that it exhibits particular percent water absorption. In such dephosphorizing material, whe
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Maeda Terunobu
Negishi Atsunori
Hazama Corporation
Nessler Cynthia L.
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