KR100308807B1 - Microbial contact for waste water treatment - Google Patents

Abstract

In the present invention, a nylon monofilament loop coated with an emulsion of a nylon BCF multi-threaded loop having a Y-shaped cross section and an animal oil, a surfactant, and a biostimulant is formed around a core part made of polyethylene rope yarn. The present invention relates to a microbial contact material for wastewater treatment, wherein the loop yarn is fixed to the core part by polypropylene multi-threaded yarn and adhered by PVA or acrylic contact agent. The component part is composed of special material according to its function and use, and it is inexpensive and shows the best treatment efficiency, and furthermore, it is excellent in the initial microbial activity, and has the advantage of quickly normalizing the water quality of the treated water.

Description

Microbial contact material for wastewater treatment {MICROBIAL CONTACT FOR WASTE WATER TREATMENT}

The present invention relates to a microbial contact material for wastewater treatment, and more particularly, in a microbial contact material having a plurality of loops formed around a core part, loop yarns may be used for animal and vegetable oils, surfactants, and biostimulants. The present invention relates to a microbial contact material for wastewater treatment, which is coated with a mixed emulsion.

Generally, wastewater treatment methods such as domestic water, industrial wastewater, and livestock wastewater can be largely classified into physical treatment, chemical treatment, and biological treatment. In the physical treatment method, no chemical reaction occurs, but only a physical action, and a treatment using a screen bath, a settled paper and the like. The chemical treatment method is a method mainly using a chemical reaction, and is a treatment method using a neutralization tank, oxidation, reduction reaction tank, flocculation tank, adsorption tower, and the like. The biological treatment method is a method of treating wastewater using microorganisms, and is a method of using a reaction facility such as activated sludge tank or activated sludge tank.

Among these, chemical treatment using chemicals causes another environmental pollution. Recently, biological treatment using microorganisms has been actively studied. The biological treatment method can decompose various organic materials and has an excellent treatment efficiency. Such biological treatment methods include activated sludge process and catalytic oxidation method. Catalytic oxidation is a method of aeration of microorganisms in contact with microorganisms in a microbial culture tank, and it has recently been in the spotlight because of low sludge generation and simple facilities. It is actively done.

The microbial contact materials used in the catalytic oxidation method are classified into fluidized bed contactors and stationary bed contact materials according to the contact materials. The fluidized bed contact material is mainly a molded article or activated carbon produced by injection of plastics, and the manufacturing cost is low, but since the adhesion of microorganisms has a disadvantage of poor wastewater treatment efficiency, its use is rapidly replaced with fixed phases. The stationary phase contact material is mainly manufactured by processing the fiber filament, and the amount of microorganisms attached is advantageous in terms of processing efficiency, whereas the manufacturing cost is high and the microorganisms are excessively attached, causing the blockage to occur and anaerobic inside. Microorganisms are detached and have a disadvantage in that the treatment efficiency decreases with time. Moreover, since the polymer composite constituting the fixed-phase microbial contact material is insoluble in water, the microorganisms adhere to the surface by physical action when added to the wastewater. The microbial adhesion takes a certain time, so that the water quality of the treated water is poor during this period. There is a problem.

One object of the present invention is to overcome the problems in the prior art as described above, to provide a microbial contact material for wastewater treatment that can promote the early microbial adhesion is able to quickly normalize the water quality of the treated water.

Another object of the present invention is that the surface area is large, the microorganisms are attached to a large amount in a short time, the porosity is large, the occlusion does not occur, and the proliferated microorganisms do not detach and exhibit a high treatment efficiency, and low-cost manufacturing cost microbial contact material To provide.

That is, in the present invention, a nylon monofilament loop coated with an emulsion of a nylon BCF multi-threaded yarn having a Y-shaped cross section and an animal oil, a surfactant, and a biostimulant is mixed around a core formed of polyethylene rope yarn. The present invention provides a microbial contact material for wastewater treatment, wherein the loop yarn is fixed to the core part by polypropylene multi-thread yarn and adhered by PVA or acrylic contact agent.

1 is a schematic diagram of one embodiment of a microbial contact material for treating wastewater of the present invention.

* Description of the symbols for the main parts of the drawings *

1: core part 2: nylon BCF multi-thread loop

3: nylon monofilament loop 4: polypropylene multithreaded yarn

Hereinafter, the present invention will be described in more detail.

The microbial contact material for wastewater treatment according to the present invention relates to a microbial contact material for wastewater treatment in which a plurality of loops are formed around a core part, and the loop is fixed to the core part by a loop fixing thread and is firmly attached by an adhesive. The microbial contact material of the present invention improves wastewater treatment capacity and economic efficiency by using different fibers for different purposes and functions of the core part, the loop part, and the loop fixing part.

In order to contact a large amount of microorganisms in contact with the microorganism contacting material, the surface area per unit length must be large, but the porosity must be large to prevent rot caused by blockage. Nylon monofilament coated with a nylon BCF multi-threaded yarn with Y-shaped cross section which protects against the impact of bubble flow, and an oil and animal oil, surfactant, and biostimulant mixed together as a loop yarn.

In the wastewater treatment using the microbial contact material as in the present invention, when the microbial contact material for wastewater treatment is installed in a biological treatment tank with a predetermined length, the microorganisms attached by the physical bonding to the contact material grow while decomposing organic matters. Waste water is purified. Therefore, it is preferable that the microorganisms adhere to the contact material as soon as possible, so that the present invention can increase the adhesion of the initial microorganisms by coating the surface of the microbial contact material with nutrients that can be well decomposed by the microorganisms and promote the growth of the microorganisms. It is characterized in that the water quality of the treated water is quickly normalized by shortening the time when the water quality falls below the reference value.

As a method of manufacturing the microbial contact material for treating wastewater of the present invention, a method of manufacturing a contact material and then depositing and coating the nutrients in a mixed solution may be used, but this method is complicated and uneconomical. There are disadvantages. Accordingly, in the present invention, animal and vegetable oils, surfactants, and the like to the spinning oil during spinning of the fiber by using a process for imparting an emulsion for the prevention of trimming, antistatic, multi-thread concentration, etc. during spinning of the fiber. The biostimulant is coated by passing the mixed solution so that a mixed emulsion containing nutrients is coated on the surface of the contact material economically without a separate facility.

In the present invention, animal and vegetable oils are water-insoluble and do not dissolve in wastewater, and thus serve as nutrients easily decomposed by microorganisms. The animal and vegetable oils include vegetable oils such as corn oil, soybean oil, rice bran oil, and lard. One or two or more of the animal oils are used in combination, and the amount thereof is preferably 5 to 50% by weight of the spinning oil.

In the present invention, the surfactant serves to expand the interface between the microorganism and the animal and animal oil. Since the microorganism is anionic, a cationic surfactant or a nonionic surfactant is suitable, and the amount of the surfactant is 0.1% by weight of the spinning oil. It is preferable that it is to 1.0 weight%.

In the present invention, biostimulant uses a mixture of nitrogen and phosphate compounds, which are essential for the growth of microorganisms, and the amount of biostimulant is preferably 1 to 5% by weight of animal and vegetable oils.

On the other hand, since the fiber fixing the loop to the core part is a simple fixing role, a polypropylene multi-threaded yarn 4 having high tensile strength and low cost is used, and the core part 1 is used so that the contact material does not fluctuate against the resistance of air and water. Polyethylene rope yarn with excellent tensile strength should be used because it should be supported and free from breakage or elongation after long-term use.

In addition, in the present invention, when fixing the fibers forming the loop in the core portion using only the loop fixing yarn, a contact agent is used so that the fibers forming the loop portion are firmly bonded to prevent the fiber from breaking or fleeing when used for a long time. More firmly.

Preferably, referring to FIG. 1, the core part 1 is polyethylene rope yarn of 42,000 denier 84 plywood, and the loop is coated with an nylon BCF multi-thread yarn loop 2 of 900 to 1100 denier, 42 plywood of Y-shaped cross section and an emulsion. A nylon monofilament loop (3) of 600 to 800 denier quadruped yarns is mixed, and the loop anchoring yarn is a polypropylene multi-fiber thread (4) of 900 denier 90 spun yarn.

The microbial contact material for treating wastewater of the present invention can be prepared by a conventional method, for example, nylon BCF multi-thread yarn and 8 bobbins wound with nylon monofilament coated with an emulsion in advance and polypropylene multi-thread yarn to be used as a loop fixing yarn. 8 bobbins are mounted on the bobbin moving guide. Each bobbin moving guide is mounted in 16 cylindrical grooves connected to each other. When the machine is operated, each bobbin crosses each other along the groove of the guide and rotates in the opposite direction. This rotation causes each filament to twist continuously around the polyethylene rope yarn. At this time, in the method of the present invention, the nylon BCF multi-threaded yarn and the nylon monofilament are formed using a stationary bed needle to form a loop perpendicular to the length direction of the microbial contact material. That is, a fixed-phase needle is installed at the center of eight cylindrical grooves at intervals of two of the sixteen cylindrical grooves, the end of which is positioned at a constant distance in eight directions around the wick polyethylene rope yarn to form a loop shape among the rotating bobbins. The bobbin rotates outward of the needle so that each filament is caught by the needle and moves toward the rope yarn, and when it reaches a certain length, it pulls out of the needle to form a loop shape and the polypropylene multi-thread yarn used to fix it always rotates inside the needle. To fix the loop shape formed. This method raises only the filament that forms the loop shape by raising the needle up at regular time intervals, and then moves downwards after a certain time, so that the loop falls out, compared to the conventional method of manufacturing the microbial contact material for wastewater treatment. As well as its diameter has the advantage of being adjustable freely. In this way, the polyethylene rope yarn wound with the loop-shaped nylon monofilament is discharged to the outside by an automatic discharge device installed above.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the following Examples are only for the purpose of explanation and should not be construed as limiting the protection scope of the present invention.

Example

In preparing a nylon monofilament used as a raw material for the microbial contact material, 5 wt% of corn oil was added to a nylon anti-eluent, 10 wt% corn oil, 0.5 wt% surfactant, and a 5: 1 mixture of urea and sodium monophosphate. After mixing, the spun fiber was coated by passing it through the above mixture.

A nylon BCF multi-threaded loop of 900 denier, 42-joined nylon BCF multi-threaded yarns and a coated 600 denier 4-ply yarn nylon monofilament loop obtained above were wound around a polyethylene rope yarn of 42,000 denia 84-ply yarn of the core part The mixing ratio between the nylon monofilament loops is formed to be 1: 7, and the loop yarns are fixed by using polypropylene multi-threaded yarn of 900 denier 90 ply yarn, and then bonded using acrylic contact to prepare microbial contact material for wastewater treatment. It was. In order to evaluate the microbial adhesion ability and the reduction of biological oxygen demand of the microbial contact material thus obtained, 24 cm of the microbial contact material was installed in a 4 L aeration tank, and the retention time was 12 hours, and the initial BOD 250 ppm of sewage for 7 days. It is shown in Table 1 below by measuring the microbial adhesion amount and BOD of the treated water for each day while continuously supplying.

Comparative example

Except that the nylon monofilament for the loop was not coated with an emulsion, a microbial contact material for wastewater treatment was prepared in the same manner as in Example, and the microbial adhesion amount and the BOD were measured in the same manner and shown in Table 1 below.

TABLE 1

As confirmed through Table 1, the microbial adhesion rate of the microbial contact material prepared from a fiber coated with a mixed oil mixed with corn oil, a surfactant and a biostimulant in a spinning oil was not treated with an emulsion. It was much faster than that of the contact material. At the start of the treatment, most microorganisms were attached to the contact material and reached a steady state. At this time, the BOD of the treated water showed a stable water quality of less than 10 ppm.

The microbial contact material for wastewater treatment according to the present invention exhibits the best treatment efficiency at low cost because the material of each component of the loop is configured differently according to each use and function, especially since the nylon monofilament of the roof yarn is coated with a mixed oil. The adhesion of the initial microorganisms is enhanced to have the advantage that can quickly normalize the water quality of the treated water.

Claims (5)

A nylon monofilament loop coated with a nylon-BCF multi-threaded loop having a Y-shaped cross section and an emulsion of a mixture of animal and vegetable oils, surfactants, and biostimulants is formed around the core portion made of polyethylene rope yarn. A microorganism contact material for wastewater treatment, wherein the sag is fixed to the core part by polypropylene multi-fiber yarn and adhered by PVA or acrylic contact agent. The mixed oil of claim 1 wherein the blended emulsion comprises 5-50% by weight of animal and vegetable oils in the spinning oil, 0.1-1.0% by weight surfactant in the spinning oil and 1-5% by weight of biostimulant in animal and vegetable oils. Microbial contact material for wastewater treatment, characterized in that the emulsion. The microbial contact material for wastewater treatment as claimed in claim 1, wherein the biostimulant is a mixture of a nitrogen compound and a phosphate compound. The microorganism contact material for wastewater treatment according to claim 1, wherein the surfactant is a cationic surfactant or a nonionic surfactant. The method according to any one of claims 1 to 4, wherein the core portion is polyethylene rope yarn of 42,000 denier 84 plywood, and the loop is coated with nylon BCF multi-thread yarn loops of 900 to 1100 denier and 42 plywood having Y-shaped cross section. A nylon monofilament loop of 600 to 800 denier quadruple yarn is mixed and formed, and the loop fixing yarn is a polypropylene multi-fiber yarn of 900 denier 90 ply yarn.