KR20030084809A - Method for fabricating hybrid porous media for wastewater treatment - Google Patents

Abstract

PURPOSE: A method for fabricating hybrid porous media for wastewater treatment is provided to produce porous biomedia having good biocompatability and high organic decomposition efficiency at a low cost. CONSTITUTION: The method comprises the steps of spray coating PVA solution on aluminosilicate based media; mixing the spray dried media with plastic sol, epoxy and aqueous PVA solution; and calcining the media at 100 to 200 deg.C for 5 min to 1 hr.

Description

Organic-inorganic hybrid activator porous method

The present invention relates to a method for producing a wastewater treatment carrier and a carrier produced by the same, and more specifically, to enable the production of a carrier having a high biocompatibility and a high porosity, while treating wastewater pollution with high efficiency, The present invention relates to a method for preparing a carrier for contamination treatment that facilitates biomass control and a carrier prepared thereby.

Conventionally, the carriers used for the treatment of sewage and waste water are made of natural materials such as natural materials, activated carbon, ceramic materials, and synthetic resins as the main raw materials. When using natural materials as the main raw materials, the environment and nutrients are good for microorganisms. On the other hand, since the organic material is used as a binder in the manufacturing process, problems such as decomposition of the organic material and pore control of 900 ° C or more are likely to occur. In addition, when the ceramic material is used as the main raw material, there is a limit in the tradeoff between porosity and physical properties.

For example, Korean Laid-Open Patent Publication No. 97-26382 proposes a method for manufacturing a carrier through a high-temperature sintering process by using waste foundry sand, which is a fine dust generated in a foundry, as a main raw material, and adding sawdust and zeolite. Since the sintering temperature is 900 to 1,000 ° C. and the sintering temperature holding time is about 0.5 to 10 hours, the raw material cost is low, but the high energy cost is required during manufacturing. Have a problem

Accordingly, an object of the present invention is to prepare a slurry having alumino-silicate inorganic material and a thermoplastic water support material as a main component in order to overcome the above disadvantages, and then heat treatment at a low temperature of less than 200 ℃ to produce a high porosity, high efficiency microbial carrier. I'm trying to provide a way.

The present invention to achieve the above object

(1) coating aluminium-silicate raw material with a spray dryer

(2) mixing step of coated raw material and Plastisol, epoxy, FV aq.

(3) A fixed-phase microbial carrier was prepared by the method of preparing a fixed-phase microbial carrier for cylindrical and hollow wastewater treatment, which comprises the steps of dissolving the coated fives.

Hereinafter, the present invention will be described in detail.

In the inorganic material of the present invention, Alumino-Silicate-based raw materials were used. More specifically, kaolin, clay, zeolite, Alumina, and Silica-gel may be mentioned. At this time, the particle size was used to pass the 100 ~ 325 mesh sieve in consideration of the specific surface area of the carrier.

After mixing and coating the alumino-silicate raw material powder used in the above with the fV A and then using a spray dryer (spray drying) to make a bonding bridge (bonding bridge) and then the coating particles and the coating particles to be granulated By maximizing the porosity. In general, the spray drying is made of granules to improve the moldability by making a plurality of particles into a single spherical particle, but in the present invention, the process of mixing the fine powder and the powder dozens to hundreds more than the improvement of the moldability This is to improve the porosity of the carrier when it is granulated by forming a bonding bridge at and is bonded again using a fibC soll and an epoxy, and the fib is mixed and poreized.

The thermoplastic resin serves to bind the powdery inorganic materials to each other, and in the present invention, polyvinyl chloride (FIB) and epoxy among various thermoplastic resins are used. In this case, in order to control the thermoplastic resin reaction and curing rate, a stabilizer and a curing agent are used in a weight range of 0 to 10%. In the present invention, a curing agent is not added to the PV brush, and Zn-octade-canoate and Ca are used as stabilizers. Only -octadecanoate was added and the curing agent was added to the epoxy. In addition, as a pore forming agent, FV A was also added.

Thermoplastic resins, fV aq. And a stabilizer (curing agent) were put into a stirrer and stirred at the same time. In this case, it is preferable to use 10 to 40% by weight of epoxy, 20 to 60% by weight of FBC, and 20 to 60% by weight of FV aq. After sufficient stirring, the raw material of Alumino-Silicate granules was added and stirred again. At this time, it is preferable to use the alumino-silicate-based inorganic: binder & pore-forming agent = 60 ~ 95: 40 ~ 5 by weight. The inorganic material used provides numerous pores through the pores between particles to increase the affinity for microorganisms and plays an important role in determining the specific gravity of the carrier. If the inorganic material is used at less than 5% by weight, the effect on economic and microbial affinity is negligible. When the binder is used in an amount less than 5% by weight, some of the active support material (inorganic material) is released in water, and when used in excess of 40% by weight, it is difficult to prepare the carrier and affects the porosity, specific surface area, etc. of the carrier. There is a problem in that the adsorption capacity and adhesion ability of microorganisms decreases.

The slurry thus prepared is molded into cylinders and spheres by using an extruder and a granulator. At this time, it is preferable to mold in the form of cylinders and spherical particles, the diameter of which is preferably within the range of 2 ~ 30mm, less than 2mm is less compatible, and larger than 30mm is difficult to extrude, and the specific surface area is reduced and performance is also reduced It was economical.

In this way, the molded article in the form of a cylinder and a spherical particle is heat-treated at 200 ° C. or less to prepare a microorganism immobilization carrier. At this time, there may be a large pore inside the hollow form. Heat treatment conditions were hardened by heat treatment for 1 minute to 1 hour at 200 ℃ or less considering the properties of the binder. In this step it can be seen that the curing reaction proceeds between the raw materials and the binder. The heat treated sample was cooled to room temperature and then placed in distilled water and boiled for 6 hours. In this step, the fVA in the granulated particles and the FVA in the aqueous solution are released to form pores.

Put the boiled carrier in the dryer and dried for 24 hours to create an organic-inorganic hybrid type microorganism immobilization carrier.

Example 1

150 g of alumina granules were put into 100 g of the organic mixture (70 g of fibC sol, 25 g of epoxy, 40 g of aq. Aq. And a stabilizer (curing agent)) and tested in the same manner as described above. At this time, the carrier properties were apparent porosity 65%, absorption 87%, apparent specific gravity 2.1, volume specific weight 0.8.

Example 2

5g sol 70g, 50g epoxy, 5g aq. 50 g of clay granules were added to 100 g of the mixture of the stabilizer (tabletizer) and 100 g. The carrier properties were apparent porosity 51%, water absorption 61%, apparent specific gravity 1.7, volume specific volume 0.8.

As a result of experimenting whether the sample prepared in Example 2 is biologically stable, most of the prepared carriers consisted of COD components, and the test results contained 800-900 mg of COD components per 1 g of F. seed carrier. It was found to be. The elution characteristics of the carrier were determined to be 0.756 mgCOD / g-org. media / day. This is 0.21 mgCOD / g-org. It was improved by more than 3.5 times compared to media / day, and when 2kg was filled in the anoxic tank of the Bio-filter process, the total dissolution rate was 1,512mgCOD / day, which showed much better filter characteristics.

The organic-inorganic hybrid cylindrical or spherical carrier prepared by the present invention has excellent adhesion state of the microorganisms compared to the polymer carrier, the thickness of the microbial membrane is as thin as the ceramic carrier, and is physically and chemically stable against the growth of the microorganisms. In addition, microorganisms grow in high concentrations in cylinders or spherical carriers over a long period of time, which is stable against fluctuations in load concentrations of wastewater and is excellent in removing pollutants, and when used in filtration tanks, By preventing the outflow of the pin floc can improve the quality of the final effluent water, and can maintain and multiply the microorganisms at a much higher concentration than conventional carriers, it is also applicable to high concentration organic wastewater or hardly degradable wastewater treatment.

Furthermore, the cost savings from low temperature heat treatment and shortening of the process are expected.

Claims (4)

In the embodiment, alumino-silicate (kaolin, clay, zeolite), Alumina, and Silica-gel were used for the solid, and the particle size was 100 mesh or less and the particles were coated with a spray dryer. Way In the embodiment, the firing is carried out for 5 minutes to 1 hour at a temperature of 100 ~ 200 ℃ In the embodiment, the method of forming the pores in such a way that the FV enters the pore-forming agent and water treatment As in Examples 1 and 2, 10 to 40% by weight of epoxy, 20 to 60% by weight of FBC, and 20% to 60% by weight of FVAaq.