JPH10249372A - Production of waste water treating filter medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight filter medium easy to handle and facilitating the parasitism of a microorganism as the waste water treating filter medium for use in catalytic oxidation and contact aeration. SOLUTION: The fiber 2 of coconut is beaten into a bulky laminate, vinylidene chloride resin and polyester resin or epoxy resin are sprayed on the laminate, and the intersections of the fibers are joined to form a mat 1. This plant fiber is the fiber of coconut, the fiber of flax, the fiber of New Zealand flax or the fiber of the bark of palm. The spraying of the resin consists of the first spraying to join the intersections of the fibers and the second spraying to cure the fibers with the intersections joined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing a filter medium for wastewater treatment suitable for performing biological treatment of organic matter in sewage in a sewage treatment facility or the like.

[0002]

2. Description of the Related Art Biological treatment methods for decomposing and removing organic substances in sewage by the action of microorganisms are widely used today.

[0003] As a method of infiltrating a filter medium into an aeration tank sometimes to form a useful biofilm of microorganisms on the surface of the filter medium and efficiently removing suspended or dissolved organic matter in sewage, a contact oxidation method or a contact oxidation method is used. There is an aeration method.

[0004] As a filter material of this processing method, a material in which a filler such as plastic is filled in a metal cage is known.

[0005]

The above-mentioned filter medium in which a filler such as plastic is packed in a metal cage has a problem that it is heavy, bulky and inconvenient to handle.

[0006] It is an object of the present invention to solve these problems and to provide a method for producing a filter medium which is lightweight, easy to handle, and easily infested with microorganisms.

[0007]

According to the present invention, in order to achieve the above-mentioned object, resin fibers are blown on a pile of plant fibers which are loosened to form a large pile, thereby joining intersections of these fibers.
It is characterized by being formed in a mat-like body.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

In the method for producing a filter medium for wastewater treatment according to the present invention, first, fibers 2 collected from coconut fruits are applied to a cotton batter, so that the fibers 2 are loosened and piled up in bulk, and formed into a mat shape.

Next, a vinylidene chloride resin latex is sprayed as a first spray, and the latex resin is cross-bonded to the coconut fiber 2.

Further, a polyester resin or an epoxy resin is sprayed thereon as a second spraying to harden the joined intersections, thereby obtaining a mat-like body 1 most suitable as a filter medium for wastewater treatment.

Next, the method of using the filter medium for wastewater treatment obtained by the method of the present invention and the effects thereof will be described.

FIG. 2 shows a part of a waste water treatment apparatus using a contact oxidation method or a contact aeration method, and mats 1 having a thickness of 25 mm are arranged at intervals of 25 mm in a water channel 3 of about 25 m.

That is, while the sewage or drainage is flowing through the water channel 3, the suspended organic matter or dissolved organic matter in the sewage or drainage is quickly dispersed by the aerobic film or the anaerobic film formed by the microorganisms attached to the mat-like body 1. Therefore, the wastewater treatment can be efficiently performed in a short time.

Since the mat-like body 1 is based on a bulky pile of coconut fibers 2, it has a large surface area per unit volume and is lightweight. Furthermore, since these fibers 2 have a myriad of micropores such as nutrient supply holes and pores, they are optimal for the attachment and growth of microorganisms, which is a feature of the present invention.

The mat-like body 1 shown in the embodiment of FIG. 2 has a weight ratio of coconut fiber to synthetic resin sprayed of 6: 1, a space ratio of 96% or more, and a weight density of 40 kg / m ^3. Formed.

The sewage of BOD 91 mg / L at the inlet of the waterway 3 becomes BOD 6 mg / L at the outlet of the waterway 3,
It showed a high removal rate of about 93%.

In the present embodiment, coconut fiber is used as the filter medium for wastewater treatment. However, this is replaced with hemp fiber, maolan fiber, or palm skin fiber instead of coconut fiber. Fibers may be used.

Any material may be used as the material for the first spraying as long as it is a resin latex, but the vinylidene chloride-based resin latex which is not toxic for the attachment and growth of microorganisms is preferred.

The material for the second spraying is not limited to the polyester resin or the epoxy resin, but may be any thermosetting resin capable of curing the joint at the intersection of the fibers.

[0021]

As described above, according to the present invention, it is possible to provide a filter medium for wastewater treatment, which is lightweight, easy to handle, and easily infested with microorganisms.

[Brief description of the drawings]

FIG. 1 is a perspective view of a filter medium for wastewater treatment of the present invention.

FIG. 2 is a perspective view of a part of a water channel equipped with the filter material for wastewater treatment.

[Explanation of symbols]

 1 Matte body 2 Coconut fiber 3 Waterway

Claims (8)

[Claims] 1. A method for producing a filter medium for wastewater treatment, characterized by forming a mat-like body by spraying a resin onto a bulky pile of plant fibers which have been loosened to form intersections of the fibers. Method. 2. The method according to claim 1, wherein the plant fiber is a coconut fiber. 3. The method according to claim 1, wherein the plant fibers are hemp fibers, maolan fibers, or palm skin fibers. 4. The method according to claim 1, wherein the spraying of the resin includes a first spraying that connects the intersections of the fibers and a second spraying that hardens the fibers that have the intersections. 3. The method for producing a filter medium for wastewater treatment according to item 1. 5. The method according to claim 4, wherein the first spraying is spraying a latex of a resin. 6. The method according to claim 5, wherein the latex of the resin is a vinylidene chloride-based resin latex. 7. The method according to claim 4, wherein the second spraying is spraying a thermosetting resin. 8. The method according to claim 7, wherein the thermosetting resin is a polyester resin or an epoxy resin.