JPS5864178A - Material for purification of water - Google Patents

Abstract

PURPOSE:To obtain a water purifying material which can filter suspended matter present in water and concurrently adsorb a very small amount of organic substance contained therein, by interwinding a plurality of short fibers into a fibrous block, and including powdery active carbon between each of the short fibers. CONSTITUTION:A water-purifying agent 1 is constituted of a fibrous block formed by interwining a plurality of short fibers 2 and including powdery active carbon 3 between the short fibers 2. The material of the fiber is preferably polyester, nylon or the like from the standpoint of the durability and easy formability of the fibrous block in the purification of water, the length of the short fibers is preferably at 5-50mm. considering the easiness of intertwinement, and the diameter of the short fibers is preferably about 10-100mu although depending on Young's module of the material of the fiber to be used. The fibrous block is preferably a sphere, ellipsoid or disc shape having the maximum diameter of 5-100mm., and the powder active carbon included in the fibrous block preferably has a particle size of 6-145 mesh as regards the easiness to be held between fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present Kakumei filters suspended matter present in water, and at the same time can adsorb trace amounts of organic matter. The present invention relates to a water treatment material having adsorption ability.

Conventionally, the unit operations of filtration and adsorption have been performed separately. In other words, for example, water containing suspended matter and trace amounts of organic matter is purified by first removing the suspended matter using a filter medium such as sand, and then introducing the water into an adsorption column to adsorb and remove trace amounts of organic matter. There is.

Among these unit operations, the filter media used for filtration are as follows:
Filter paper, filter cloth, cefmic, wire mesh, sand, etc. are used, but since the contact area between the liquid to be filtered and the filter medium is small, the effect of adhesion of suspended matter in the liquid to the filter medium is low, and the filter is difficult to filter. However, if an attempt is made to obtain a sufficient filtration effect, there is a problem in that the amount of filtration decreases, that is, the filtration efficiency decreases.

In adsorption operations, various adsorbents have been proposed for adsorbing trace amounts of organic matter in water, but activated carbon is most commonly used due to its versatility.

When activated carbon is used as an adsorbent, a method of increasing the surface of the activated carbon, that is, reducing the particle size, is usually adopted in order to increase the adsorption rate. However, reducing the particle size increases the pressure loss in the active column, making it necessary to reduce the passage speed within the column.

Furthermore, the frequency of backwashing increases, resulting in a decline in processing efficiency.

Another method is to add activated carbon as a powder to the liquid.
After stirring, solid-liquid separation is carried out by coagulation sedimentation or filtration. However, these methods have drawbacks such as a large number of steps, a quantitative supply device for powdered activated carbon, and a separate microfiltration device.

As described above, conventionally, purification of water containing suspended matter and trace organic matter requires at least two stages of treatment operations: filtration and adsorption, and both the monitoring and adsorption operations have various problems. A point exists.

The present invention provides a novel water treatment material that has both the function of a 1SII material and the function of an adsorbent, and can solve all the above-mentioned various problems in purifying water containing suspended matter and trace organic matter. It is something to do.

That is, the water treatment material of the present invention is characterized by comprising a fiber mass in which a plurality of short fibers are entangled with each other and granular activated carbon is included between the short fibers.

FIG. 1 is a structural model diagram showing an example of the water treatment material of the present invention. It has a structure in which granular activated carbon (3) is included between short d and fibers.

The filter media used to separate water and solids allows the filtrate to pass through, but prevents the passage of suspended solids.

It is necessary to have a fine mesh surface with numerous water passage holes for attaching or fixing this to the surface of the filter medium. The greater the number of water passage holes and the larger the area of the mesh surface, the greater the filtration efficiency. Since it is made of fibers that fit together, the number of water holes and the area of the mesh surface are very large, making it extremely excellent as a filter medium. The water treatment material of the present invention also has an adsorption function by including granular activated carbon in the gaps in the three-dimensional network structure of entangled short fiber masses, that is, between the short fibers.

This granular activated carbon is reliably supported by a three-dimensional network structure formed by short fibers, so even if the particle size of the activated carbon is made smaller in order to increase the adsorption area, there will be no adverse effects such as an increase in pressure loss. Totally unacceptable.

Any type of fiber may be used to form the fiber mass constituting the water treatment material of the present invention, and the structure of the formed fiber mass may vary; however, the size, shape, and entanglement of the fiber mass may vary. The condition of the fiber is determined by the physical properties such as the thickness, length, Young's modulus, stiffness, density, and coefficient of friction of the fiber, the surface structure, or the manufacturing method of the fiber. As fiber materials, organic fibers such as natural fibers, recycled fibers 1 synthetic fibers, and gaff fibers.

One or more types of inorganic fibers such as metal fibers and mineral fibers are selected as needed, but Z-lyester, nylon, vinylon, rayon, etc. are particularly suitable for durability in water treatment and ease of forming fiber lumps. is preferred. The fiber length of the short fibers is preferably 5 to 5C11 from the viewpoint of ease of tangling.

Also, the diameter of short fibers depends on the Young's modulus of the fiber material, but 1
A thickness of about 0 to 100 microns is good.

In addition to circular cross-sectional shapes, fibers with irregular cross-sections such as triangular, star-shaped, and hollow fibers can also be used.

The fiber mass is preferably spherical, spherical or disc-shaped with a maximum diameter of 5 to 100 mm.

The granular activated carbon contained in the fiber mass preferably has a particle size of 6 to 145 mesh because it is easily retained between the fibers. Adsorption rate is slow for particles larger than 6 mesh9
Electroplating applied to the configuration of the present invention is not permitted. In addition, small particles of 145 mTSV or less have poor retention between fibers and are very likely to fall off during use as a water treatment material.

The water treatment material of the present invention can be easily manufactured by the method described below. That is, a predetermined group of short fibers and granular activated carbon are mixed and dispersed in a liquid such as water, and
By continuing water jet agitation by gas blowing or tangential agitation with a blade, etc. for 10 minutes or more while maintaining the temperature at a predetermined temperature in the range of 0°C, the short fibers become entangled with each other and granular activated carbon is formed between the fibers. A retained fiber mass with a maximum diameter of 5 to 100 square meters is obtained.

In the above method, water or organic solvents such as ethylene glycol or ethanol can also be used as the dispersion liquid.
Considering the characteristics of activated carbon, it is best to use water.

As a water treatment method using the water treatment material of the present invention, for example, it is sufficient to simply fill the water treatment material of the present invention in place of the filter material or activated carbon in a conventional filtration tank or activated carbon tower and pass the water to be treated. . At the same time as removing suspended matter in the water to be treated
Trace amounts of C organic matter can also be adsorbed and removed.

The water treatment material of the present invention can be widely applied to advanced treatment of industrial wastewater, advanced treatment of sewage treatment, purification of tap water, etc. Particularly in the purification of tap water, the ability to adsorb and remove IC trace organic substances 1, such as humic acid, which is said to be a trihalomethane precursor, at the same time as removing suspended matter is of great practical importance.

You can obtain safe, hygienic, and delicious drinking water that does not contain odor-causing substances.

As described above, the water treatment material of the present invention has both the function of a filter medium and the function of an adsorbent. Instead of two separate stages of treatment including adsorption and removal, this can now be done in one stage.

In addition, there is no increase in pressure loss, the i11 excess rate, and the adsorption rate are very high, making #M an excellent water treatment material.

Next, one embodiment will be described.

Example 5001 water was placed in a cylindrical stirring tank with a diameter of 1 #l and a height of 1.5 mm, equipped with a paddle-type stirring blade, the temperature was adjusted to 50°C, and the water was first cut into 2 (II) lengths. 10 # of polyester fibers with a diameter of 45 microns and 10 # of activated carbon beads with a mesh size of 20 to 48 were added while being dispersed.
The stirring blade was rotated at r, p, and m for stirring. 60 after injection
When stirring was continued for a minute, a large number of fiber lumps with a diameter of 15 to 30 m were obtained with granular activated carbon held between the fibers.

The above-mentioned activated carbon-containing fiber mass was filled into a PVC cuff with a +i diameter of 30α to a height of 111I, and activated sludge treated water of domestic wastewater (83: 10 ppm, COD: 15 ppm) was prepared.
m) was passed through with water at 5V3h-1. As a result, even after 3 days of continuous water flow, the treated water had a concentration of 8B: 0.7 ppm.
, COD: maintained at 5 ppm.

[Brief explanation of drawings]

FIG. 1 is a structural model diagram showing one example of the water treatment material of the present invention. (1)--Water treatment material of the present invention 5 (2)-' Short fiber (3)
- Granular activated carbon patent applicant Unitika Co., Ltd. Hoi 1 Sen

Claims (1)

[Claims] (1) A water treatment material consisting of a fiber mass in which a plurality of short fibers are stacked against each other and contain granular activity between the short fibers.