JP2797234B2 - Flocculant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a coagulant for water treatment of seawater, river water, lake water, sewage, human waste, various industrial wastewaters, etc., and as a dewatering aid for sludge generated in these water treatment processes. It relates to a suitable flocculant.

[0002]

2. Description of the Related Art Conventionally, organic coagulants and liquid coagulants such as inorganic PACs and sulfate bands have been known for coagulating SS components in water. In recent years, organic polymer flocculants are frequently used for various water treatments, and a fixed amount of a solution containing about 0.2% of the organic polymer flocculant is injected to coagulate inorganic and organic SS components in water. I was letting it. In addition, the inorganic coagulant has been used in combination with the organic polymer coagulant when the SS component in water has a low concentration or the like.

[0003]

However, the conventional organic polymer coagulant and inorganic coagulant coagulate the SS component in water, and cannot coagulate the dissolved chromaticity component. It was possible, and it was unsuitable to use for pond water purification such as removal of burns. In addition, the organic polymer flocculant has a drawback that it is absolutely necessary to use a powder as an aqueous solution of 0.2% or more of the powder, and is very difficult to handle due to its viscosity. Further, the organic polymer flocculant has a deliquescent property, and has a problem in storability because it dislikes moisture. The present invention solves the above-mentioned conventional problems, and can accurately agglutinate not only SS components in water but also chromaticity components or blues dissolved in water, and powders are not dissolved. It is only necessary to inject tens of ppm into water as it is, and it can also be used as a dewatering aid during sludge dewatering, reducing the water content of sludge dewatered cake, improving the peelability of dewatered cake and improving the separation liquid It is an object of the present invention to provide a flocculant capable of improving water quality.

[0004]

The present invention provides a SrO.6F
_{e 2 O 3, Al 2 O} 3, and is a principal component of fine powder of coral fossil, the SrO · _6Fe 2 _{O 3} 35%
As described above, the coagulant is characterized in that the Al ₂ O ₃ content is 30% or more and the coral fossil content is 20%.

[0005]

The coagulant of the present invention comprises SrO.6Fe ₂ O ₃ , A
It is mainly composed of l ₂ O ₃ and fine powder of coral fossil. The ratio of these is 35% for SrO · 6Fe ₂ O _3.
%, Al ₂ O ₃ is 30% or more, and coral fossil is 2
0%. Sr of magnetoplumbite ferrite
_O · _6Fe 2 O ₃ contains 80-90% of _Fe 2 _{O 3.} Further, as Al ₂ O ₃ , aluminum oxide having a content of 99% is preferable. Furthermore, coral fossils are composed of coral, foraminifera, calcareous algae, molluscs and other remains of the geological age of the 4th century, and have a CaCO ₃ content of 97-9.
8%, which also has a heavy metal adsorption effect. These are mixed into fine powder, and added to the target water or target sludge while the fine powder is in a dry state, and mixed and used, and is extremely effective as a coagulant or a dehydration aid.
Further, Fe ₂ O ₃ is also effective in coagulating the dissolved chromaticity component. It is also preferable to add a silver powder or the like that elutes monovalent silver ions to impart a sterilizing effect. Table 1 shows an example of a typical composition of the flocculant.

[0006]

[Table 1]

[0007]

【Example】

Example 1 Pond water was used as raw water, and the coagulant of the present invention shown in Table 1 was injected as a powder at 10 ppm and stirred for 3 minutes. After standing for 5 minutes, the quality of supernatant water and raw water was measured. It was as shown.

[0008]

[Table 2]

Example 2 For coagulation agent of the present invention shown in Table 1 as a powder, 0.1% of DSS was injected into DSS as surplus activated sludge of secondary treatment of human waste and mixed sludge with tertiary treatment of urine. When stirring for 3 minutes,
As a comparative example, a CST test was performed on a case where a 0.2% solution of a cationic polymer flocculant was injected with 0.5% of DSS and the mixture was stirred for 3 minutes.

[0010]

[Table 3]

Example 3 The mixed sludge after the coagulant injection and stirring in Example 2 of the present invention and Comparative Example was dewatered with a belt press type dehydrator. The water content of the obtained dewatered cake was as shown in Table 4. there were.

[0012]

[Table 4]

[0013]

As described above, the present invention provides a SrO.
6Fe ₂ O ₃ , Al ₂ O ₃ , and fine powder of coral fossil as main components, and 35% or more of SrO · 6Fe ₂ O ₃
30% or more of ₂ O ₃ and 20% of coral fossils,
It is a flocculant that can be used as it is in a dry state, it can accurately agglutinate SS components, organic substances, and inorganic substances in water, and at the same time, can also aggregate dissolved chromaticity components, etc., and is also effective in purifying pond water, etc. Further, it is used as a dewatering aid for sludge dewatering, which is useful for reducing the chemical consumption rate and the water content of dewatered cake, and has extremely beneficial effects such as improving the water quality of the separated liquid.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01D 21/01

Claims (1)

(57) [Claims] 1. The method according to claim 1, wherein the main component is fine powder of SrO.6Fe ₂ O ₃ , Al ₂ O ₃ , and coral fossil.
O.6Fe ₂ O ₃ is 35% or more, and the Al ₂ O ₃ is 30% or more.
% Or more, and the coral fossil is 20%.