JPH0716586A - Organism fixing carrier for waste water treatment, method and apparatus for clarifying waste water - Google Patents

Abstract

PURPOSE:To improve the clarification efficiency of waste water by increasing the deposition and proliferation rate of organism by giving a flocking treatment on the surface, which contacts at least waste water, of a solid carrier raw material which forms an organism fixing solid carrier for clarifying waste water by biological treatment. CONSTITUTION:This organism fixing carrier used for an apparatus for clarifying dirty water in a river polluted with waste water of various kinds by biological treatment is prepared by a method in which flocking process is provided on the surface, which contacts at least waste water, of a solid carrier raw material selected from crushed stone, ceramics, blast furnace slag, ceramic pieces, pulverized concrete block, plastics, and so forth. Fibers of a nylon, cotton, a polyethylene, and others, in particular, fibers having a porous core indicating capillarity are preferably used as flocks. More than one solid carrier raw material is bonded together forming spaces between the solids to penetrates them. The carrier is loaded with microorganisms for treating waste water and nutriment for the microorganisms.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an organism-fixing carrier for sewage treatment for purifying sewage such as industrial effluent, household effluent or the like or sewage in rivers contaminated by these various effluents by biological treatment. The present invention relates to a wastewater purification method and a wastewater purification device using a fixed carrier.

[0002]

2. Description of the Related Art As a method for purifying various kinds of waste water or sewage in rivers, a biological treatment method of treating with a microorganism has been known. As such a biological treatment method, a method has been proposed and carried out in which microorganisms are held in activated sludge or a biological fixed carrier, sewage is subjected to contact treatment, and flocculated to precipitate or separate and remove. Such bio-immobilized carriers include, for example, biofilms formed of fibrous materials having a large surface area, non-woven fabric moldings or ropes; porous materials such as activated carbon, zeolite, and mospite; special synthetic materials having a large surface area on rod-shaped plastic materials. Form in which fibers are entwined in a spiral shape; crushed stone aggregates in which two or more quarries are aggregated and joined to form pores are proposed, and in order to perform the inter-gravel catalytic oxidation method, the bottom floor of rivers, etc. It has also been proposed that a gravel bed directly laying gravel on it, a concrete box body having a plurality of wastewater inflow / outflow ports filled with a plurality of crushed stones, and the like.

However, in the method using the above-mentioned porous material or crushed stone, immobilization of microorganisms is still insufficient, or even if it is sufficient, precipitation and removal of floc-like substances after wastewater treatment are complicated. There is a problem such as. On the other hand, in the case of a bio-immobilized carrier using the fibers, sufficient microorganisms can be immobilized, and the flocs can be easily peeled off or precipitated after the sewage treatment, but they may be suspended in the sewage stream, Since it has to be fixed to a special device, there are problems that the installation location is limited and the installation method becomes complicated.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to have an extremely high rate of attachment and growth of microorganisms, to attach aerobic and anaerobic microorganisms in a well-balanced manner, and to efficiently purify wastewater. An object of the present invention is to provide a biological fixed carrier for sewage purification, a sewage purification method, or a sewage purification device.

Another object of the present invention is to provide a biological fixed carrier for sewage purification, a sewage purification method, or a sewage purification device, in which flocs generated by sewage treatment can be easily removed.

[0006]

According to the present invention, there is provided a biological fixed carrier for purifying sewage by biological treatment, wherein at least the surface of the solid carrier raw material forming the carrier, which is in contact with sewage, is subjected to flocking treatment. A biological fixed carrier for sewage treatment is provided.

Further, according to the present invention, there is provided a sewage purification method characterized in that sewage is brought into flow contact with the biological fixed carrier for sewage treatment for biological purification treatment.

Further, according to the present invention, there is provided a sewage purification apparatus characterized in that the sewage treatment biological fixed carrier is arranged in a frame body provided with an inflow / outflow port of the sewage so as to come into contact with the sewage.

The present invention will be described in more detail below.

The biological fixed carrier for purifying sewage of the present invention is, for example, crushed stone, ceramic, blast furnace slag, porcelain pieces, crushed concrete block, plastic, etc. It is a thing.

The material, size, shape, etc. of the solid carrier raw material are not particularly limited as long as they have a specific gravity that does not float in water, but the normal size is usually an average diameter of 1 to 30 cm.
Is preferred. The carrier raw material solid may be a single substance, but preferably, a plurality of carrier raw material solid substances are joined by cement, an adhesive or the like, and the inside and outside are communicated with each other by the gap between the carrier raw material solid substances. It is preferably an aggregate or the like in which continuous ventilation holes are formed. That is, the aggregate does not adhere to all of the surface portion of the solid material of the carrier raw material,
It is sufficient that the gap formed by the single surface of each solid solid material of the carrier other than the joint portion is a communicating hole that communicates the inside and outside of the collecting body.

As the adhesive agent for bonding the solid material of the carrier raw material, a known adhesive agent can be used depending on the material. Particularly, for adhering industrial waste such as ceramic pieces,
Epoxy polymer mortar adhesives and the like can be preferably used. At this time, all the pores formed by the gaps of the solid materials of the carrier raw materials do not necessarily have to be the continuous ventilation holes, and may have the pores that are closed inside. The pore diameter is 1 mm or more, especially 1 to 5
mm is preferable, and the porosity is 70% or more, particularly 70 to
It is preferably 90%.

The flocking applied to at least the surface of the solid material of the carrier raw material or the aggregate which comes into contact with the dirty water is, for example, nylon, rayon, cotton, polyethylene, polypropylene,
A fibrous material such as acrylic, particularly preferably, the inside of the fiber is porous, has air permeability, exhibits a capillary action, and has a function of absorbing water, for example, trade name "Aqualon"
This can be performed by adhering a porous fiber material such as (manufactured by Kanebo Co., Ltd.). The fiber diameter of the fiber material is preferably 3 to 15 denier, and the fiber length is 3 to 10 mm.
Is desirable. If the fiber length is less than 3 mm, the amount of adhered microorganisms is not sufficient, and if it exceeds 10 mm, the flocs of microorganisms are easily peeled off, which is not preferable. Further, it is desirable that the amount of fibers to be transplanted is 50 to 200 g / cm ² . In this case, at least flocking applied to the surface that comes into contact with the dirty water means flocking on the entire surface if the carrier raw material solid is a single substance or, in the case of laying on the bottom floor of a river, on the surface excluding the part that comes into contact with the bottom floor. If the solid material of the carrier raw material is an aggregate, it is sufficient that the surface of the aggregate is flocked, and it is not always necessary to flock the inner surface of the pores through which sewage passes. May be.

To carry out the above-mentioned flocking treatment, for example, a known emulsion-type or solvent-type adhesive, specifically vinyl-based, ethylene-based, acrylic-based, melamine-based, urethane-based, is applied to the flocked portion of the solid carrier raw material. , Epoxy, polyester, vinyl acetate, polyamide, rubber, silicone or the like may be applied, and then a required amount of fibrous material may be flocked by, for example, electrostatic flocking. At this time, in the case of flocking the carrier raw material solids alone, at least the surface contacting the sewage may be flocked. In order to flock the aggregates of the carrier raw material solids, the flocking is performed after forming the aggregates. Alternatively, after flocking the individual solid material of each carrier material, the flocked single elements may be joined together to form an aggregate.

The biological fixed carrier for treating sewage of the present invention can be used by arranging the above-mentioned flocked carrier raw material solid material alone or in an aggregate at a position where it is brought into contact with sewage. In order to carry out efficiently, microorganisms to be biologically treated and / or nutrient sources of the microorganisms, specifically ammonium salts, nitrites, nitrates, phosphates, etc. may be retained on the hair-implanted portion before being used. it can. In order to retain the microorganisms and / or the nutrient source of the microorganisms on the biological fixed carrier for treating sewage, it is carried out by, for example, immersing in a solution containing the microorganisms and / or the nutrient source of the microorganisms, or by spraying the solution. be able to.

The method for purifying sewage of the present invention can be carried out by arranging it at an appropriate place by a known method, etc., if sewage can be brought into flow contact with the biological fixed carrier for treating sewage. Specifically, for example, a sewage treatment organism fixed carrier, a method of arranging instead of gravel such as gravel and crushed stone in the conventional gravel contact oxidation treatment, a method of laying directly on the bottom floor of the river, inflow and outflow of sewage A box, conduit, column, or other such frame body is filled with the sewage treatment biological immobilization carrier or is disposed at a location that comes into contact with sewage, and a sewage purification device is installed in a river or industrial wastewater through which sewage flows, domestic wastewater, etc. The sewage can be brought into contact with the organism-fixing carrier by a method of arranging in place of crushed stone or the like in a known method of sewage treatment by branching the effluent of a wastewater distribution pipe or the flowing water of a river.

At this time, since the organism-fixing carrier does not float in water, it can be installed in the same manner as conventional crushed stone. Also, since the biological fixing carrier has hair transplants, microorganisms are efficiently attached to the biological fixed carrier to biologically treat the sewage. The biologically treated wastewater adheres to the fibrous material that has been flocculated and flocked, but when the flocs grow to some extent (depending on the flow rate of the wastewater, the weight of the flocs, etc.) There is no need to perform the work of peeling the floc-like material from the biological fixed carrier, because it spontaneously peels from the planted portion and precipitates or flows. Therefore, it can be used semipermanently depending on the installation method.

The sewage purification apparatus of the present invention is as described above.
The sewage inflow / outflow port is provided, and the box, conduit, column, or other frame body is filled with the sewage treatment organism-immobilizing carrier or disposed at a position in contact with sewage. It may be a combination of a plurality of frame bodies having a carrier.

The sewage inflow and outflow ports provided in the frame body may be provided at one place each, but the sewage flow in the frame body is preferably not directed in a constant direction as much as possible, and preferably the sewage water is more efficiently used for biological treatment. In order to change the flow of water and create an aeration state, it is preferable to provide a plurality of them. In particular, the shape of the inflow / outlet may be changed, or even if the shape is the same, for example, an elliptical mouth can be formed in various directions such as vertical, horizontal, and diagonal. An aeration state can be created by arranging them. Further, a device for creating such an aerated state by a known mechanical method may be added, and the aerated state can also be created by a method of disposing the biological fixed carrier in the frame with steps.

In the sewage purification apparatus of the present invention, the amount of the sewage treatment biologically fixed carrier placed in the frame body is not particularly limited, and varies depending on the flow rate of sewage, but the contact time is preferably 10 to 10. It is desirable to arrange the amount to be 15 minutes.

[0021]

EFFECTS OF THE INVENTION The biological fixed carrier for treating sewage of the present invention is excellent in the attachment rate and the growth rate of microorganisms because at least the surface in contact with sewage is flocked. Further, when the biological fixed carrier for treating wastewater is an aggregate in which a plurality of carrier raw material solids are joined, or when a single body of the solid fixed body is filled in a plurality of frames, etc., different pore diameters formed by the gaps of the single bodies. Since the flow rates of the sewage flowing through the pores are different, aerobic and anaerobic microorganisms can be attached in a well-balanced manner, and the sewage can be purified more efficiently. Moreover, since the floc-like material after purification is naturally peeled off from the flocked portion, it can be used without maintenance. On the other hand, in the sewage purification method and the sewage purification device of the present invention, since the biological fixed carrier for treating sewage is used, the sewage can be efficiently purified as compared with the conventional method or device using the biological fixed carrier. .

[0022]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples below, but the present invention is not limited thereto.

[0023]

Example 1 An adhesive of trade name "TSK Mortar Bond" (manufactured by Taisei Sangyo Co., Ltd.) was applied to the surface of a ceramic piece, which is an industrial waste having irregularities on the surface of 20 × 35 × 40 mm. Next, electrostatically absorb water-absorbing acrylic fiber (product name "Aqualon", manufactured by Kanebo Ltd.) having a fiber length of 3 mm and a fiber diameter of 20 densi at a rate of 50 g / cm ² by using an electrostatic flocking machine (manufactured by Mesac). The hair was transplanted to prepare a biological fixed carrier. Then, the obtained 45 biological fixed carriers were used as 400 × 650 equipped with the wastewater inlet 2 and the wastewater outlet 3 shown in FIG.
The box 1 of × 450 cm was randomly filled. next,
After flowing sewage at a flow rate of 250 mm / s for 3 days, BOD (biochemical oxygen consumption), SS (suspended substances) and COD (chemical oxygen consumption) of sewage at sewage inlet 2 and sewage outlet 3 Was measured. The results are shown in Table 1. Further, when the biological fixed carrier was observed after circulating the sewage for 10 days, a flock-like substance having a width of 10 mm was attached to the flocked portion, and when the sewage was allowed to flow for another 15 days, the floc-like substance spontaneously peeled off.

[0024]

[Example 2] Epoxy polymer mortar bonding under the trade name "TSK mortar bond" (manufactured by Taisei Sangyo Co., Ltd.) on the surface of a plurality of ceramic pieces, which are industrial wastes having an average surface of 40 x 30 x 20 mm with irregularities After the agent was applied, the surfaces were adhered so that the respective surfaces were not completely joined, and a ceramic piece aggregate having a diameter of about 20 cm was prepared. In the obtained aggregate, a large number of pores of 1 to 5 mm were formed due to the gaps between the respective ceramic pieces, and some of them were pores communicating the inside and outside of the aggregate. Then, on the surface of this aggregate, hair was transplanted in the same manner as in Example 1 to prepare a biological fixed carrier, and then the same box 1 as in Example 1 was randomly filled and each measurement was performed. The results are shown in Table 1. Further, when the biological fixed carrier was observed after circulating the sewage for 10 days, a flock-like substance having a width of 10 mm was attached to the flocked portion, and when the sewage was allowed to flow for another 15 days, the floc-like substance spontaneously peeled off.

[0025]

[Example 3] Each measurement was performed in the same manner as in Example 2 except that the microorganism-fixing source ammonium salt was sprayed on the biological fixed carrier prepared in Example 2. The results are shown in Table 1. Also, when the biological fixed carrier was observed after circulating the sewage for 10 days, a flock-like substance having a width of 30 mm was adhered to the flocked portion, and when the sewage was allowed to flow for another 15 days, the flock-like substance spontaneously peeled off.

[0026]

Comparative Example 1 Each measurement was performed in the same manner as in Example 2 except that the aggregate produced in Example 2 was not flocked. The results are shown in Table 1. Further, when the biological fixed carrier was observed after circulating the sewage for 10 days, the floc-like substances adhered to the sparsely instead of the entire surface of the aggregate, and the sewage was allowed to circulate for 15 days, but the floc-like substances were natural. An attempt was made to remove the flock-like material with an air gun without peeling, but it was not possible to peel all.

[0027]

[Table 1]

[Brief description of drawings]

FIG. 1 is a perspective view showing a box body filled with a biological fixed carrier used in Examples and Comparative Examples.

Claims (5)

[Claims] 1. A biological fixed carrier for purifying sewage by biological treatment, characterized in that at least the surface of the solid carrier raw material forming the carrier, which is in contact with sewage, is subjected to flocking treatment. Biologically fixed carrier. 2. The biological fixed carrier is formed by joining a plurality of carrier raw material solids, and forming communication holes at least between the inside and the outside by the gaps between the carrier raw material solids. 1. The biological fixed carrier for treating sewage according to 1. 3. The biological fixed carrier for sewage treatment according to claim 1 or 2, wherein the biological fixed carrier holds a microorganism for treating sewage and / or a nutrient source of the microorganism. 4. A method for purifying biological wastewater, which comprises biologically purifying treatment by bringing wastewater into circulation contact with the biological fixed carrier for treating wastewater according to any one of claims 1 to 3. 5. A sewage purification characterized in that the biological fixed carrier for sewage treatment according to any one of claims 1 to 3 is arranged so as to come into contact with sewage in a frame body provided with an inlet / outlet for sewage. apparatus.