KR100668030B1 - Fixed porous filtering media and manufacturing method the same for wastewater treatment - Google Patents

Abstract

In the present invention, blast furnace slag and wood chips are added to synthetic resins such as plastics and waste plastics to maintain specific gravity control or strength, and at the same time, the surface is extruded in the form of unevenness, thereby making the surface area larger than conventional media. In addition, the present invention relates to a fixed-phase contact medium for sewage and wastewater treatment, which can increase the porosity, increase porosity, and reduce the strength required by the product, and achieve uniform quality.

The present invention, the polymer synthetic resin as a porous support, the porous support is crushed to a predetermined size particles, crushed porous support particles 65 to 97wt% blast furnace slag 1-25wt%, wood chip (fine wood chip) 1 After mixing 20 wt% and 1-20 wt% of chaff or mixing 5-30 wt% of constant and sewage sludge, it is subjected to extrusion through the melting process, extruded into one of coil and ring shape, and then cooled. It provides a fixed phase contact medium for sewage and wastewater treatment prepared through.

In the method for producing a contact medium according to the present invention, a polymeric synthetic resin is used as a porous support, and the porous support is pulverized into particles of a predetermined size. A first step of mixing 1 to 20 wt% of fine wood chips and 1 to 20 wt% of chaff, or mixing 5 to 30 wt% of constant and sewage sludge; A second step of melting the mixture at 220 to 350 ⁰ C; A third step of extruding the molten mixture in the form of a coil or a ring; And a fourth step of performing a rapid cooling process at 7 ^° C. or less for 5 to 10 seconds.

Description

FIXED POROUS FILTERING MEDIA AND MANUFACTURING METHOD THE SAME FOR WASTEWATER TREATMENT}

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 2a and Figure 2b is a side cross-sectional view and A-A 'cross section of the stationary phase contact medium according to the present invention.

Figure 3 is a cross-sectional view of the filter medium to form a three-dimensional pores by adding the salt of the present invention.

Figure 4 is a graph showing the particle size analysis results of the stationary phase contact medium according to the present invention.

Figure 5 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 6a and Figure 6b is a state in which sulfur is deposited and applied to the contact medium according to the present invention.

Figure 7 is an illustration standardizing the contact media according to the present invention by shape.

The present invention relates to a high-performance fixed-phase contact medium used for sewage and wastewater treatment, and to a method for manufacturing the same. In particular, the present invention has a higher internal porosity, less impurity residues, and superior strength to pores than conventional contact media. In addition, the present invention relates to a stationary phase contact medium for environmentally stable sewage and wastewater treatment having a large surface strength and free control of specific gravity, and a method of manufacturing the same.

In general, the fixed-phase contact medium used for the treatment of sewage and wastewater has a large surface area, a high porosity, a high porosity, and a strength enough to overcome the buoyancy caused by water entering the reactor when deposited in the reactor. It should have a specific gravity of and a uniformity of quality.

Conventional contact media is prepared by pulverizing waste vinyl, etc. as a main raw material, mixing it with stone powder, masato, etc., and melting and extruding at a low temperature of around 300 ⁰ C. By maximizing the surface area, BOD, SS 100mg / L and high concentration of wastewater is purified.

However, the conventional contact media prepared using such synthetic resins are limited to the blowing agent that can be used because most of the operation is carried out at a low temperature of about 300 ⁰ C or less, thereby evaporating some carbonization and water It is the situation that the foaming by the main. Therefore, since the partially carbonized impurities are scattered inside the filter medium, there is a limit in increasing the porosity, and there are problems such as deterioration in quality due to impurities.

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, but the residual product and pore structure Not uniform 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.

In order to overcome this problem, Korean Patent Application No. 10-2002-0063449 uses a polymer synthetic resin powder as a main raw material and alumina powder, waste lime mixed with calcium carbonate, ceramic powder, ceramic composite fiber, clay, carbon black, etc. Although one contact medium and a method of manufacturing the same are disclosed, it does not meet all the basic characteristics of the contact medium as mentioned above, there is room for improvement.

Therefore, the present invention has been proposed to solve the above problems, by adding blast furnace slag and wood chips as a subsidiary material to synthetic resins such as plastic or waste plastic, while maintaining specific gravity control or strength, the surface is uneven By extruded to the surface, not only can the surface area be increased, but the porosity can be increased, and even when the pores are enlarged, the strength required by the product can be reduced, and the quality can be made uniform. It is an object of the present invention to provide a stationary phase contact medium for wastewater treatment and a method of manufacturing the same.

In addition, the present invention provides a fixed-phase contact medium for sewage and wastewater treatment and its manufacturing method that can increase the utilization of the inside of the filter medium by adding salt (NaCl) after granulation control to expand the coarse void to the inside. There is a purpose.                         

In addition, the present invention improves the penetration of denitrification sulfur by allowing the interior of the contact medium to be spaced, so that the sewage and wastewater treatment that can be in contact with the sewage and effluent to treat a certain amount of sulfur for each purpose without long-term media replacement Another object is to provide a stationary contact medium and a method of manufacturing the same.

In order to achieve the above object, the present invention, the polymer synthetic resin as a porous support, the porous support is pulverized to a predetermined size particles, blast furnace slag 1 to 25wt%, wood chips, 65 to 97wt% of the crushed porous support particles, wood chips (fine wood chip) 1 to 20wt% and chaff 1 to 20wt% mixed and added through the extrusion process followed by the melting process, extruded to any one of the coil and ring shape, manufactured by cooling process Provide a fixed bed contact medium for wastewater treatment.

Here, waste vinyl or waste plastic may be used as the polymer synthetic resin.

Blast furnace slag added to the subsidiary material is to control the specific gravity of the media and to maintain the strength. Sawdust may be used as the wood chip, and in this case, when mixed with chaff and extruded into a coil or ring shape, the microbial adsorption performance may be improved by acting as a mediating function for forming a rough rough surface.

In addition to the blast furnace slag, wood chips, rice husks, the subsidiary material of the present invention may further include a dewatering sludge in order to give a function of foaming and specific gravity control. At this time, the dewatered sludge is applied to sewage treatment plant sludge and water purification plant sludge, respectively. Sewage treatment plant sludge with high organic matter concentration is used to increase the foaming function and water treatment plant sludge is used to increase specific gravity. The amount added is 5-30 wt%, respectively.

In the present invention, salt and sulfur, which are solid foaming agents, may be added to impart functionality in addition to the main materials and subsidiary materials. In this case, the salt is to give coarse voids, and is added in an amount of 5 to 20 wt%, and the sulfur is stable and long-term. It is added to increase the denitrification efficiency over, 10-30wt% is added.

In addition, in the present embodiment, at least one or more selected from alumina powder, waste lime mixed with calcium carbonate, loess powder, ceramic composite fiber, clay, and carbon black may be further added to the above-described submaterial.

In the method for producing a contact medium according to the present invention, the polymeric synthetic resin is a porous support, and the porous support is pulverized into particles of a predetermined size, and the blast furnace slag 1-25 wt% as a component in the pulverized porous support powder is 65 to 97 wt%, wood. A first step of mixing a chip (fine wood chip) 1-20wt% and chaff 1-20wt%, constant and sewage sludge 5-30wt% to make a mixture; A second step of melting the mixture at a predetermined temperature; A third step of extruding the molten mixture in the form of a coil or a ring; And a fourth step of performing the cooling process.

During the manufacturing process, 5 to 20 wt% of a solid blowing agent salt is further added to form a foam and coarse pores, and is selectively added within a range of 3 mm to 300 μm particle size to make coarse pores in several mm units. At this time, after separating the salt of the small particle size and the large particle size by sieving, in order to increase the filling degree in the filter medium is characterized in that the ratio of the granules and fine particles 6: 6-9: 1.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 1 to 7.

The fixed phase contact media according to the present invention and its manufacturing method are to maximize the efficiency of wastewater and sewage treatment, and the essential conditions that the fixed phase contact media used in the state of being deposited in the sewage and wastewater to be treated first Silver must maintain voids and gaps, and the media of the present invention is coarse pores and a wide range of micropores are formed so that the specific gravity is greater than water, and strength should be excellent in order to deposit in the water. In addition, there should be no deformation for long-term use.

In order to satisfy these conditions, in the present embodiment, as a material for imparting functionality to the powder 65wt% to 97wt% of various polymer synthetic resins, such as plastic and waste plastic, to control the specific gravity of the media and to maintain the strength 1 to 25 wt% of blast furnace slag, 1 to 20 wt% of fine wood chip and 1 to 20 wt% of chaff, 5 to 30 wt% of constant and sewage sludge, The mixed mixture is subjected to extrusion through a melting process, and then extruded into one of a coil and a ring shape, and then manufactured through a cooling process.

Here, waste vinyl or waste plastic may be used as the polymer synthetic resin as a main material, and these materials function as porous supports.

The fixed bed media in the present invention 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, should be suitable for treatment of the treatment plant, such as cleaning the reactor. Sometimes blast furnace slag is added to meet these conditions because it must be able to withstand water pressure and self weight of about 10m in the water-containing state, and there should be no change in form even after maintenance of the reactor.

At the addition ratio of the submaterial, when the blast furnace slag is added in an amount of 1 wt% or less, the strength required in the treatment tank (strength enough to withstand the weight and water pressure in the state in which the medium contains water) can be maintained. If it is added to 25wt% or more, it is possible to increase the specific gravity, but it is difficult to maintain the uniformity of the melt-extruded content, and thus there is a problem that it is impossible to secure the desired surface area.

Sawdust may be used as a fine wood chip added as the subsidiary material, and in this case, when mixed with chaff and molded into a coil or ring shape, the surface roughness is extruded to improve microbial adsorption performance. You can do it.

In the case of the wood chips and chaff, when added to less than 1wt%, the surface roughness is not obtained, when added to more than 20wt% there is a problem that the specific gravity is reduced and the elasticity of the media can not be maintained.

In addition to the blast furnace slag, wood chips, rice husks, the subsidiary material of the present invention may further include a dewatering sludge in order to give a function of foaming and specific gravity control. At this time, the dewatered sludge is applied to sewage treatment plant sludge and water purification plant sludge, respectively. Sewage treatment plant sludge with high organic matter concentration is used to increase the foaming function and water treatment plant sludge is used to increase specific gravity. The amount added is 5-30 wt%, respectively.

The inventors of the present invention have excellent foaming power when the components forming the contact medium when the contact medium is foamed at a high temperature, and can form a homogeneous void by foaming, and also homogeneity of the product Experiments confirmed that this can be achieved.

In view of this, the inventors of the present invention, the components of the contact media disclosed in the Korean Patent Application No. 10-2002-0063449 mentioned in the prior art is a synthetic resin, alumina powder, ceramic powder, ceramic composite fiber, clay and Carbon black and the like basically each component does not contain water, it was recognized that there is a problem in terms of foaming force, securing homogeneous pores by foaming and homogeneity of the product.

On the contrary, among the components of the contact media according to the present invention, wood chips, rice hulls, sewage sludge and constant sludge, except for sorghum, contain an appropriate amount of water in a natural state, so it is disclosed in Korean Patent Application No. 10-2002-0063449. Unlike the contact media, it is possible to achieve excellent foaming force and homogeneous voids by foaming and homogeneity of the product.

In addition, except for waste lime, most of the components of the contact media disclosed in Korean Patent Application No. 10-2002-0063449 are new, not recycled resources, but most of the components of the contact media according to the present invention are waste. As it is a resource, it is also economical in terms of recycling resources as compared to the contact media disclosed in Korean Patent Application No. 10-2002-0063449.

In this embodiment, it is preferable to perform rapid cooling after extrusion in order to increase the surface hardness of the stationary bed media. Specifically, it is preferable to cool for 5 to 10 seconds at 7 ⁰ 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, so that the microcavity generated by the rapid cooling process can be preserved and the hardness of the surface can be further increased.

In order to impart coarse voids to the contact medium prepared as described above, 5 to 20 wt% of a solid foaming agent is additionally added. At this time, when the salt is 5wt% or less, it is impossible to form pores of a desired size, and sufficient surface area cannot be obtained, and when it is 20wt% or more, it helps 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 ⁰ 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.

In the present invention, the salt used as the solid foaming agent is selectively added within the particle size range of 3mm to 300㎛ to make coarse pores in the unit of several millimeters, and after separating the salt of the small particle size and large particle size by sieving, In order to increase the filling ratio, the ratio of coarse particles to fine particles is 6: 4 to 9: 1.

Further, in order to increase the denitrification efficiency in the submaterial, sulfur may be further added in an amount of 5 to 30 wt%, as shown in FIGS. 6A and 6B. At this time, sulfur is applied to the surface of the filter media by several mm, and the media can also be deposited up to several cm in thickness of several mm.

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.

As described above, the media of the present invention prepared by using a polymer synthetic resin such as waste vinyl or waste plastic as a main material, and adding blast furnace slag, wood chips and rice hulls as a subsidiary material are shown in FIGS. 1A and 1B. Extruded in coil or ring form. At this time, The diameter of the media can be adjusted from 5 to 150 mm and the cross section to 8 to 30 mm by the member, and the shape can also be manufactured variably by changing the mold shape of the tapping nozzle part.

In the embodiment of the present invention, as shown in Figs. 2A and 2B, the ribs are extruded in a shape in which convex ribs are added to predetermined portions of the outer circumferential surface of the circular cross section at equal intervals. This can solve the problem that, when extruded into a circular cross section, a phenomenon occurs when extrusion is formed, and also a problem in that the diameter wound in the form of a coil during extrusion is produced in a non-uniform state, and the strength is increased by ribs. There is an advantage to making it larger. That is, extrusion may vary depending on the temperature and pressure variables, while the ideal pressure and temperature cannot be maintained at all times during extrusion, and the raw materials used for the extrudate cannot also be ideally blended. Therefore, when the pressure and temperature conditions according to the extrusion are changed slightly, the end of the extruded portion is sensitively reacted according to the above conditions, so that if the cross section of the coil or the ring is circular, it is extruded while being rolled into an uneven shape. , It is extruded while spinning. For example, when the coil diameter is set to 50 to 150 mm and the pitch is set to 10 to 30 mm, as shown in FIG. 7, it may be extruded while being unevenly rolled to a size outside the diameter and pitch. This can lead to problems that make objectification and standardization of media products difficult.

On the contrary, when the ribs are extruded on the circular cross section as described above, the ribs can be prevented, the surface area can be enlarged by the ribs, and the coils can be extruded homogeneously when forming into a coil. There is an advantage.

In the embodiment of the present invention, at least one selected from alumina powder, loess powder, ceramic composite fiber, clay, carbon black, and calcium carbonate mixed waste lime in addition to the above-described materials may be added, and the addition ratio is 1 Let it be 30 wt%.

These characteristics are demonstrated as follows.

In the case of the alumina (α-Al ₂ O ₃ ) powder, the specific gravity is about 4 can be easily adjusted with the furnace slag even with a small amount of addition, when added to a homogeneous size in the unit of mm in mm, In addition to ensuring specific gravity, the size of the micropores can be made constant. 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.

In addition, the prerequisite for mass production of the fixed bed media of the present invention is to increase the extrusion speed, in order to meet this condition by using powdered carbon black of submicron size to double the media production capacity. The powdered carbon black acts as a lubricant in the extrusion process, not only serves to suppress wear of the conveying screw device, but also increases porosity, and helps to uniformize the size of the micropores.

As a means for securing the strength of the stationary bed media, ceramic composite fibers having a length in the range of 3 mm to 5 cm may be added together with the blast furnace slag. In this case, the tensile and compressive strength can be strengthened by about two times to prevent deformation of the form against external pressure.

In addition, the ocher 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 it is accompanied by the instant foaming process such as cavitation bubbles generated by the decompression of steam and the shortest part of the nozzle, so that the microorganism Optimal space for habitation and habitation can be obtained.

The suitable operating temperature for melting synthetic resin and auxiliary materials including waste vinyl varies slightly depending on the amount of resin and the type of resin, but 220 ~ 350 ⁰ C is suitable. However, when the polyethylene (PE), polypropylene (PP), ABS or the like is added, each operation temperature may increase slightly.

4 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. 4 a and b are existing media, and c of FIG. 4 is a measurement of 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 is increased. 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 5 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. It brings about the effect (percolation effect) and the connection of air space is increased, so it has the characteristic of forming tunnel-shaped opening from the inside to the surface.

On the other hand, Figure 7 is an illustration showing the specifications for each type of contact medium according to the present invention, in maintaining the porosity in the reaction tank by using the form illustrated in the figure, the coil (coil) type up 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 larger 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, by mixing the raw material such as blast furnace slag, sawdust chaff and the like into a polymer synthetic resin, such as plastic and waste plastic, and melted at a predetermined temperature, manufactured by extrusion molding and rapid cooling, In comparison with the coarse and fine pores significantly improved the composition as a stationary phase media and has the effect of increasing the function of the microorganism carrier.

In particular, the increase in porosity causes a decrease in strength and a decrease in specific gravity, but by using the functional material of the present invention as described above, specific gravity can be easily controlled, and the strength and surface hardness characteristics of the pores 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.

In addition, in the case of using waste plastics as a main material, the effect of resource recycling can also be achieved.

Claims (12)

delete A polymer synthetic resin is used as a porous support, and the porous support is pulverized into particles having a predetermined size, blast furnace slag 1-25 wt%, 1 to 20 wt% of fine wood chip, and 65 to 87 wt% of the ground porous support particles. 1 to 20 wt% of chaff is mixed and added, and 5 to 30 wt% of dehydrated water and sewage treatment plant sludges are added for foaming and specific gravity control. After extrusion, characterized in that the manufacturing through a cooling process, Stationary contact media for sewage and wastewater treatment. The method of claim 2, A cross section of any one of the coil and the ring shape is extruded by applying a rib to the outer peripheral surface predetermined portion of the circular cross section at equal intervals. Stationary contact media for sewage and wastewater treatment. delete The method of claim 2, Sulfur is applied and deposited on the surface and the inside of the filter medium, Stationary contact media for sewage and wastewater treatment. The method of claim 2, The polymer synthetic resin, characterized in that made of any one selected from waste vinyl and waste plastic, Stationary contact media for sewage and wastewater treatment. delete The polymeric synthetic resin is a porous support, the porous support is pulverized into particles of a predetermined size, blast furnace slag 1-25wt%, 1 to 20wt% fine wood chip as a subsidiary material to 65 to 87wt% of the ground porous support powder, A first step of mixing 1-20 wt% of chaff and 5-30 wt% of dehydrated water and sewage treatment plant sludge for foaming and specific gravity control; A second step of melting the mixture at a predetermined temperature; A third step of extruding the molten mixture in the form of a coil or a ring; And Including a fourth step of performing a cooling process, Method for manufacturing stationary contact media for sewage and wastewater treatment. delete The method of claim 8, Melting temperature in the second step is characterized in that, 220 ~ 350 ⁰ C, Method for manufacturing stationary contact media for sewage and wastewater treatment. The method of claim 8, After performing the third step, further comprising a fourth step of applying and depositing sulfur on the surface and inside of the media to induce denitrification, Method for manufacturing stationary contact media for sewage and wastewater treatment. The method of claim 8, The fourth step is characterized in that the rapid cooling for less than 7 ⁰ C 5-10 seconds, Method for manufacturing stationary contact media for sewage and wastewater treatment.

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