KR100464112B1 - Fixed porous filtering media and manufacturing method the same - Google Patents

Abstract

In the present invention, by adding a functional material such as alumina powder, waste lime containing calcium carbonate, carbon black, clay, ceramic composite fiber, salt and the like to synthetic resins such as plastic or waste plastic, the surface area is larger than that of conventional media. At the same time, the present invention relates to a stationary phase contact medium using a functional subsidiary material capable of enhancing specific gravity and achieving uniform quality without lowering the strength required by the product even when the porosity is further increased and the pores are enlarged. .

The present invention, the polymer synthetic resin as a porous support, the porous support is pulverized to a predetermined size particles, alumina powder, calcium carbonate mixed with alumina powder, calcium carbonate as a component in the crushed porous support powder 70-95wt%, ceramic powder, ceramic composite A first step of 5-30 wt% mixed addition of at least one selected from fibers, clay and carbon black; A second step of performing extrusion molding accompanied by melting of the mixture; And a third step of performing a cooling process and a method for manufacturing the same.

Here, in the present invention, 3wt% to 20wt% of a solid blowing agent is further added to form foam and coarse pores, and selectively added within a range of 3 mm to 300 μm particle size to make coarse pores in several mm units. At this time, the salt of the small particle size and large particle size is separated and separated, and the ratio of the granulator and fine particles is 6: 4 to 9: 1 in order to increase the filling degree in the filter medium.

As prepared as described above, the internal porosity is higher, the residual amount of impurities is less, the strength characteristics are superior to the pores, the surface hardness is increased, and environmentally stable.

In addition, by adding monocrystalline salt as a pore precursor, preparing a final base material after extrusion, and dissolving salt, it is possible to maximize the specific surface area and the internal porosity as compared to the existing media, using a constant amount of sulfur used for the denitrification reaction. It has the effect of enabling maintenance.

Description

Fixed-bed contact media and its manufacturing method {Fixed porous filtering media and manufacturing method the same}

The present invention relates to a high-performance fixed-phase contact medium to be used for sewage and wastewater treatment, and a method for manufacturing the same. In particular, the present invention has a high internal porosity, a small amount of impurities, and excellent strength characteristics compared to pores. It relates to a large, environmentally stable stationary phase contact medium and a method for producing the same.

Conventional contact media are manufactured by pulverizing waste vinyl, etc. as a main raw material, mixing them with other materials such as stone powder and masato, and melting and extruding at low temperatures of about 300 ° C. to increase microbial adhesion and cultivation. It is maximizing the purification of high concentration wastewater within BOD, SS 100mg / L.

Conventional contact media produced using such synthetic resins are limited to the blowing agent can be used because most of the operation is carried out at a low temperature of about 300 ℃ or less, this is because the foaming by evaporation of some carbonization and moisture Is the state. Therefore, there is a limit to increase the porosity because the partially carbonized impurity is powdered in the inside of the filter medium, and there are problems such as deterioration of quality due to the impurity.

In particular, in the final product, incomplete mixing of materials such as stone powder, masato, etc. used as a member, and materials mainly composed of synthetic resins such as waste vinyl are not completely incinerated and removed. Not. As a result, the quality of the extrudate is of course difficult to standardize the product. Moreover, there is a problem that cannot produce a high-strength product.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, such as waste lime, carbon black, clay, ceramic composite fiber, including alumina powder, calcium carbonate in synthetic resins such as plastic or waste plastic By adding functional materials, the surface area is larger than that of the existing media, and the void ratio is increased, and even when the pores are enlarged, the strength required by the product is not lowered, the specific gravity is increased, and the quality is equalized. It is an object of the present invention to provide a stationary contact medium and a method for manufacturing the same.

In addition, the present invention has another object to provide a fixed-phase contact medium and a method of manufacturing the same to increase the utilization of the inside of the filter medium by adding salt (NaCl) after the grain control to expand the coarse voids to the inside.

In addition, the present invention improves the penetration of denitrification sulfur by allowing the interior of the contact medium to be spatialized, so that a fixed-phase contact medium capable of contacting sewage and ape water to treat a certain amount of sulfur for each purpose without long-term replacement of the medium and its manufacture Another purpose is to provide a method.

1a and 1b is a front view of the coil type and ring type of the stationary phase contact medium according to the present invention.

Figure 2 is a cross-sectional view of the stationary phase contact medium according to the present invention.

Figure 3 is a graph showing the particle size analysis results of the stationary phase contact medium according to the present invention.

Figure 4 is a cross-sectional view showing a fracture surface microstructure for comparing the contact medium of the conventional contact medium and the present invention.

Figure 5a and Figure 5b is a state in which sulfur is deposited and applied to the contact medium according to the present invention.

Figure 6 is an exemplary view for standardizing the contact media according to the present invention by shape.

In order to achieve the above object, the present invention, the polymer synthetic resin as a porous support, the porous support is pulverized into a predetermined size particles, the alumina powder, calcium carbonate mixed with alumina powder, calcium carbonate as a component in the crushed porous support particles 70 to 95% by weight A first step of 5-30 wt% mixed addition of at least one selected from ceramic powder, ceramic composite fiber, clay and carbon black; A second step of performing extrusion molding accompanied by melting of the mixture; And a third step of performing a cooling process.

Here, in the present invention, 3wt% to 20wt% of a solid blowing agent is further added to form foam and coarse pores, and selectively added within a range of 3 mm to 300 μm particle size to make coarse pores in several mm units. At this time, the salt of the small particle size and large particle size is separated and separated, and the ratio of the granulator and fine particles is 6: 4 to 9: 1 in order to increase the filling degree in the filter medium.

In addition, the present invention is 5 to 30% by weight of at least one selected from alumina powder, calcium carbonate mixed waste lime, ceramic powder, ceramic composite fiber, clay, carbon black at 70wt% to 95wt% of the polymer synthetic resin powder as a main raw material After mixing and adding, through extrusion molding with a melting process, and extruding into any one of the coil and ring-shaped media, to provide a fixed-phase contact media prepared through a cooling process.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 1 to 6.

Fixed phase contact media according to the present invention and its manufacturing method is to implement the manufacture of the media that can maximize the efficiency of wastewater and sewage treatment, fixed bed contact media used in the state sedimented in the sewage and waste water treatment to be treated first The condition that must be maintained is the maintenance of voids and gaps, the specific gravity must be greater than water, and the strength and wear resistance must be excellent. In addition, there should be no deformation due to long-term use.

In order to satisfy these conditions, in the present embodiment, various polymer synthetic resins such as plastic and waste plastic are used as porous supports, and 70% to 95% by weight of the pulverized porous support is used to impart functionality to maximize voids and gaps. 5-30 wt% of at least one selected from alumina powder, waste lime mixed with calcium carbonate, ceramic powder, ceramic composite fiber, clay and carbon black are added and mixed, and extrusion molding and cooling accompanied with melting process Through the process to prepare a fixed bed microorganism contact medium.

Here, when the input ratio of the functional member material is 5 wt% or less, not only voids are formed but also sufficient surface area cannot be obtained. In addition, when the input ratio is 30wt% or more, it is helpful for the formation of voids, but the strength and shape cannot be maintained.

In this embodiment, in order to increase the surface hardness of the stationary bed media, it is preferable to perform rapid cooling after extrusion for 5 to 10 seconds at 7 ° C or less. Since the internal temperature of the filter medium is maintained at a high temperature even after extrusion, the micropores formed on the surface are damaged, thereby preserving the micropores generated by the rapid cooling treatment to prevent this, and further increasing the hardness of the surface.

In this embodiment, 3 to 20 wt% of a solid foaming agent is additionally added to give coarse voids to the contact medium prepared as described above. At this time, when the salt is 3wt% or less, no pores are formed, and sufficient surface area is not obtained, and when the salt is 20wt% or more, it is helpful to form the pores, but strength and shape cannot be maintained.

Since the single crystal salt as the solid foaming agent has a melting point of 1,000 ° C or more, it is discharged as it is in the melt of the synthetic resin during the extrusion process, and as shown in FIG. It acts as a pore precursor that forms as pores.

The salt after the preparation does not remain in the filter medium, the pore structure is uniform through the control of the particle size and the amount of addition, there is an advantage that can produce a filter medium with a high internal porosity.

Salt used as a solid foaming agent is selectively added within the particle size range of 3mm to 300㎛ to make coarse pores of several mm units, and after separating the salt of small particle size and large particle size by sieving, to increase the filling degree in the media The ratio of coarse particles to fine particles is 6: 4-9: 1.

Next, the characteristics of the waste lime mixed with alumina powder, ceramic powder, ceramic composite fiber, clay, carbon black and calcium carbonate used as the submaterial of the present invention will be described.

Since the media of the present invention are formed with coarse pores and a wide range of micropores, the specific gravity must be greater than that of water in order to deposit in the water.

Alumina powder is used to meet these conditions. Industrial alumina (α-Al2O3) has a specific gravity of about 4, making it easy to adjust the specific gravity even with a small amount of addition, and when it is added in a homogeneous size in μm to mm, it plays a role of securing specific gravity and keeping the size of micropores constant. do. In particular, adding a small amount of acicular ceramic composite fiber to the alumina powder increases the fracture toughness strength of the media backbone due to particle strengthening and pull-out effects.

The precondition for mass production of the stationary bed media of the present invention is to increase the extrusion speed, and to meet this condition, the production capacity of the media is doubled using submicron-sized powdery carbon black. The powdered carbon black acts as a lubricant in the extrusion process, not only serves to suppress the wear of the transfer screw device, but also increases the porosity, and also helps to uniformize the size of the micropores.

In addition, the fixed bed material should be deposited in a shallow reactor of less than 3m or a deep reactor of about 10m depending on the conditions of the treatment plant, it should be suitable for the maintenance of the treatment plant, such as cleaning the reactor. Sometimes it must be able to withstand its own weight of about 10m in water and no change in form even after maintenance of the reactor.

As a means for securing the strength of such fixed bed media, the present invention uses a ceramic composite fiber having a length in the range of 3 mm to 5 cm. In this case, the tensile and compressive strength can be increased by about two times. In addition, when the ceramic composite fiber is added, the media may increase wear resistance at the same time, and may prevent deformation of the form with respect to external pressure.

In addition, the ceramic powder, waste calcium carbonate and clay are used to form macro pores, and the alumina powder, clay and carbon black are used to form micro pores. The clay is selectively added to form large pores and micropores in a range of water content including granules.

The added subsidiary materials form a wavy protrusion by friction with the nozzle of the outlet part during extrusion, and at the same time accompanied by the instant foaming process such as cavitation bubbles generated by the decompression of steam and the shortest part of the nozzle, microorganisms are attached. In this way, the optimal space for habitating can be obtained.

The suitable operating temperature for melting synthetic resin and subsidiary materials including waste vinyl varies slightly depending on the amount of resin and type of resin, but 220 ~ 350 ℃ is suitable. However, when the polyethylene (PE), polypropylene (PP), ABS and the like is added, each operation temperature may increase slightly.

The media of the present invention manufactured as described above are extruded in the form of a coil or a ring as shown in FIGS. 1A and 1B. At this time, The diameter of the media can be adjusted from 5 to 30 mm by the member, and the shape can also be varied by changing the mold shape of the tapping nozzle.

3 is a graph showing the results of particle size analysis, which is the result of particle size analysis after ultrasonic cleaning using the present invention media and conventional products as test materials. A of FIG. 3 is an existing media and B of FIG. 3 measures the media of the present invention. That is, in the case of the present invention, it can be seen that the pore size distribution of the medium moves toward the larger side, and the average size of the left coarse pores increases from 80 μm to 300 μm. In addition, the integral amount of the graph immediately indicates the total amount of pores, and the amount of pores also increases greatly, indicating that the porosity in the media is greatly improved. This enhances the function of the stationary bed media and enhances its utilization as a microbial carrier.

Figure 4 shows the internal structure of the conventional media and the media produced in the present invention.

As shown in the figure, the pore shape in the existing media has a plate shape in the longitudinal direction by the pressure during extrusion, and the pore amount is also limited. In particular, the pores contained in the media are completely blocked from the outside and cannot come into contact with water, and thus cannot be involved in the treatment of wastewater. However, since the contact media of the present invention is prepared by adding salts of spherical and square shapes, it maintains its shape even during extrusion to form three-dimensional three-dimensional pores (waste pores) inside the media, and osmotic according to the increase in the amount added. By bringing about the effect (percolation effect), the connectivity of the air space is increased to have a feature that can form a tunnel-shaped opening from the inside to the surface.

Figure 5 shows the shape of depositing and applying sulfur to the coarse pores using the media produced in the present invention, Figure 5a is a coil type, Figure 5b is a ring shape. Sulfur was applied on the surface of the media in several millimeters, and the media could also be deposited to several centimeters in thickness.

Denitrification using sulfur in a solid state has not been used in the related art because it does not improve some problems such as known contents, elution of sulfur, and input of a certain ratio. However, when the coarse pore media produced in the present invention is used, sulfur can be deposited and stored on the interior of the media, which is applied to the surface initially, and the interior can be used after the contents of the surface are exhausted. The dosage can be adjusted. Therefore, stable treatment efficiency (denitrification efficiency) and a certain amount of long-term input can be expected.

On the other hand, Figure 6 is an illustration showing the form-specific specifications of the contact medium according to the present invention, in maintaining the porosity in the reaction tank using the form illustrated in the figure, the coil (coil) type to 90%, ring Mold can be up to 80%.

The thickness of the shim of the media was Φ8 mm to Φ30 mm, and the size was 50 mm to 150 mm in outer diameter. In the case of the coil type, the thickness of the shim must be greater than the pitch because the media and the media must be stacked independently without overlapping each other in order to use the gap formed in the media.

The media produced by the manufacturing method as described above should be able to objectify and standardize. Even if the temperature and pressure are kept constant in the extrusion process, the product cannot be objectified and standardized unless the quality of the used member is standardized. In the present invention, since the member to be used is standardized, it is successful to standardize according to the use of the media.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, according to the present invention, alumina powder, waste lime mixed with calcium carbonate, ceramic powder, ceramic composite fiber, clay, and carbon black are mixed with polymer synthetic resin such as plastic and waste plastic, and extrusion molding and rapid cooling are performed. By manufacturing the fixed-phase microorganism contact medium, it has the effect of increasing the role of the fixed-phase medium and the function of the microorganism carrier by significantly improving the composition of the coarse and fine pores compared to the existing media.

In particular, the increase in porosity causes a decrease in strength and a decrease in specific gravity. However, by using the functional material of the present invention as described above, specific gravity can be easily adjusted, and the porosity, abrasion resistance, and surface hardness can be greatly improved.

In addition, after the addition of single crystal salt to the functional member and additionally prepared the final base material after extrusion, by dissolving the salt has another effect that can maximize the specific surface area and internal porosity compared to the existing media.

In addition, the quality of the product produced is made uniform by making the quality of the submaterial constant. It is possible to improve the quality and increase the production speed, to objectify and standardize the product, and to easily deposit and apply desulfurization sulfur to the inner coarse pores of the media produced in the present invention. It has another effect that can be increased.

Claims (11)

70-30% by weight of the main raw material, 70 wt% to 95 wt% of the polymer synthetic resin powder, at least one selected from the group consisting of alumina powder, calcium carbonate mixed waste lime, ceramic powder, ceramic composite fiber, clay, and carbon black A stationary phase contact filter manufactured by a cooling process after extruding through any one of the coils and the ring shape through extrusion process with a process. The method of claim 1, Fixed bed contact medium further added 3wt% to 20wt% of a solid blowing agent to form the foaming and coarse voids. The method according to claim 1 or 2, The diameter of the core of the filter medium is Φ8 ~ Φ30mm, the outer diameter of 50-150mm fixed phase contact medium. The method according to claim 1 or 2, The fixed-phase contact medium, characterized in that the sulfur is applied and deposited on the surface and the inside of the medium. The polymeric synthetic resin is a porous support, and the porous support is pulverized into particles of a predetermined size, and 70 to 95 wt% of the ground porous support powder is alumina powder, waste lime mixed with calcium carbonate, ceramic powder, ceramic composite fiber, clay, A first step of 5-30 wt% mixed addition of at least one selected from carbon black; A second step of performing extrusion molding accompanied by melting of the mixture; And Third step to carry out the cooling process Method of manufacturing a stationary contact medium comprising a. The method of claim 5, wherein The first step is a method for producing a fixed-phase contact medium further comprises 3wt% to 20wt% of a solid blowing agent to form a foam and coarse voids. The method of claim 6, Method for producing a fixed-phase contact medium, characterized in that the solid blowing agent is made of salt. The method according to claim 6 or 7, The salt is selectively added within the particle size range of 3mm to 300㎛ in order to make coarse pores of several mm unit, and after separating the salt of the small particle size and large particle size by sieving, and to increase the filling degree in the filter medium A method for producing a fixed-phase contact medium, characterized in that the fine particle ratio is 6: 4-9: 1. The method according to any one of claims 5 to 7, Melting temperature in the second step is a manufacturing method of the stationary contact medium, characterized in that 220 ~ 350 ℃. The method according to any one of claims 5 to 7, After performing the third step, the method for producing a fixed-phase contact medium further comprising a fourth step of applying and depositing sulfur on the surface and the inside of the media to induce denitrification. The method according to any one of claims 5 to 7, The third step is a method for producing a fixed-phase contact medium, characterized in that the rapid cooling for 5 to 10 seconds at 7 ℃ or less.