JP2012024664A - Microorganism carrier and biological deodorization apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the starting performance of biological deodorization and the delamination property of surplus sludge from a microorganism carrier as for biological deodorization for deodorizing and purifying a gas that contains a VOC component.SOLUTION: An open cell polyurethane foam A1 and a closed cell polyurethane foam B2 are immersed in a solution, in which agar is dissolved, to support the agar, thereby improving the starting performance of biological deodorization. The polyurethane foams A1 and 2 supporting the agar are filled in a filling part 12, the filling part is divided into eight parts, the eight divided filling parts 28 are each enclosed with an outer cylinder side surface 19 of an outer cylinder 10, a partition wall 15, an inner cylinder surface 17, and an outer cylinder surface 18, the outer cylinder side surface 19 of the outer cylinder 10 and the partition wall 15 are air-impermeable and water-impermeable SUS plates, a divided outer cylinder surface 31 of the divided filling part 28 serves as a bottom face, which is composed of a SUS punching metal of about φ5×about 19% of porosity. Washing water is supplied therein by a pump 23 to cause a swirl flow in the divided filling part 28, thereby improving the delamination property of surplus sludge from the microorganism carrier.

Description

  The present invention relates to a microbial carrier and a biological deodorization apparatus used for odor removal and purification, for example, treatment of volatile organic compounds (VOC).

  Volatile organic compounds (VOC) discharged into the atmosphere from painting factories and printing factories are the cause of suspended particulate matter and photochemical oxidants. In 2006, the revised Air Pollution Control Law was enacted, and factories that emit VOCs were given emission regulations depending on their scale.

  As a waste gas treatment method including VOC, a direct combustion method, a catalytic oxidation method, an adsorption method and the like are widely known. However, since these methods use a large amount of energy and generate a large amount of industrial waste, low-energy and low-waste biological treatment methods have been developed instead.

  Conventionally, in this type of microbial carrier and biological deodorizing apparatus, an aggregate of porous particles having a large number of pores is used as a microbial carrier, and a malodor gas is passed through the filling part filled with the microbial carrier and the filled carrier. Circulates water every predetermined time to activate microorganisms and to deodorize the organism. By making the microorganism carrier into a porous body having a large number of pores, the surface area is increased, odor component adsorption and microorganisms However, when the biological deodorizing device is operated for a long period of time, deposits adhere to the packed carrier, and these deposits are mainly biofilms that have fallen from the packed carrier. As the number of such biofilms increases, the filled carrier becomes clogged, which causes an increase in pressure loss. As a countermeasure, a porous body having pores is provided with a hollow portion considerably larger than the pores, so that even if a biofilm occurs, the large hollow portion is not completely closed, and a ventilation path is secured. In addition, one that makes it difficult to cause clogging of the filling carrier is known (for example, see Patent Document 1).

  Microorganism immobilization supports include porous carbon support lumps, ceramic porous bodies, plastic moldings, Raschig rings, slag lumps, polymer lumps such as polyvinyl alcohol, polyacrylamide, agar, copper carrageenan, nylon, polyester, polyethylene Fibers such as polyvinyl chloride or sponge bodies, natural fiber bodies such as peat moss (peat), zeolite fine agglomerates, activated carbon fine agglomerates, etc. are known (for example, refer to Patent Document 2), and porous for supporting microorganisms As the quality carrier, one made of ceramics or plastic is known (for example, see Patent Document 3).

  In order to prevent clogging and clogging in the packed part of the microbial carrier, the packed bed is divided into an upstream side and a downstream side, and large particles (for example, a diameter of 10 mm) are formed on the upstream packed layer where microorganisms are likely to block due to growth or the like. The carrier is filled with a carrier having a length of 25 mm), the gap between the carriers is widened to prevent clogging, and the downstream side is filled with small particles (for example, 6 mm in diameter and 10 mm in length) with a low possibility of clogging. The surface area of the carrier per unit volume of the packed bed (density of the carrier surface area: m2 / m3) is made larger than that of the upstream packed bed, thereby increasing the contact area of the downstream packed bed with the odorous gas, It is known to improve the efficiency of the deodorizing process by the use of the slab, to reduce the size of the biological deodorizing apparatus and to improve the processing performance (see, for example, Patent Document 4).

JP-A-2005-246106 JP 07-327671 A JP 2008-093560 A JP 2007-260559 A

  In such a conventional microbial carrier and biological deodorizing device, a porous microbial carrier is used to improve the contact between the deodorized gas and the supported microorganisms, improve the microbial deodorizing performance, and make the deodorizing device compact. However, even if the porous microbial carrier is used, a porous microbial carrier such as a ceramic porous body does not actively attach and support microorganisms. Therefore, there is a problem that it takes time for the microorganism to adhere to and carry a sufficient amount of deodorized gas on the porous microorganism carrier, and the start-up characteristics of biological deodorization are not good. Also, in order to prevent clogging and clogging in the filling part of the microbial carrier, the porous body having pores is provided with a hollow part considerably larger than the pores to support microorganisms. Although the specific surface area of the biological carrier is reduced, leading to a decrease in microbial deodorization performance, or providing a large carrier on the upstream side into which the gas to be treated with active growth of microorganisms flows may be effective in preventing clogging. The specific surface area of the carrier is reduced, the contact area per unit volume between the supported microorganism and the gas to be treated, that is, the deodorizing gas, the contact property is lowered, and the biological deodorizing performance is lowered. As a result, the proliferated microorganisms, i.e. excess sludge, cannot be peeled off or removed from the microbial carrier at the water spray level, and the pores of the porous microbial carrier are blocked, resulting in a decrease in air permeability and deodorization performance. In addition, when the carrier is only agar, it is easy to break and be subdivided when external force such as contact between the agars or flowing water pressure is applied. It is easy to be washed away from the filled part, or the air permeability in the filled part filled with the carrier is lowered, the deodorizing performance is lowered due to the lowered contact property between the gas to be treated and the supported microorganism, and there are no pores. There is a problem that the surface area for supporting is small and the specific surface area is small.

  The present invention solves the above-described conventional problems, accelerates the loading of a sufficient amount of microorganisms on a porous microorganism carrier, that is, a porous material, improves the start-up characteristics of biological deodorization performance, and It is difficult to break even when external force such as pressure is applied, and it improves the separation and removal performance of the grown microorganisms, that is, excess sludge from the microorganism carrier, ensuring the air permeability of the pores of the porous microorganism carrier, and biological deodorization It is an object of the present invention to provide a microbial carrier and a biological deodorization apparatus that improve performance.

  In order to achieve this object, the present invention provides a microorganism carrier in which agar is supported on a porous material. As a result, a sufficient amount of microorganisms can be carried on the porous material, and a microorganism carrier having improved biological deodorization performance can be obtained. The agar has zero calories, and there are almost no microorganisms that decompose the agar. When it is supported on a porous material, the agar is supported for a long period of time without being decomposed by microorganisms. The function and effect of accelerating the loading of microorganisms are maintained without impairing the surface area.

  The other means is the microorganism carrier according to claim 1, wherein the porous material is open-celled. As a result, a microbial carrier that ensures the air permeability of the porous material, increases the specific surface area for supporting microorganisms, and improves the biodeodorization performance can be obtained.

  Another means is a biological deodorization apparatus comprising a filling part for mixing and filling the microbial carrier according to claim 2 and a porous material of closed cells, and supplying a gas to be treated to the filling part. is there. As a result, the porous material with closed cells becomes an aggregate, and the biodeodorization apparatus is obtained in which the collapse in the filling portion filled with the porous material supporting microorganisms is prevented, the air permeability is ensured, and the deodorization performance is improved. It is done.

  The other means is the biological deodorization apparatus according to claim 3, further comprising running water washing means for washing the microorganism carrier. As a result, the microorganisms grown by washing the microbial carrier with running water, that is, excess sludge is effectively peeled off and removed from the open-cell and closed-cell porous material of the microbial carrier, thereby being a microbial carrier. A biological deodorization apparatus with improved deodorization performance can be obtained by ensuring the air permeability of the open-cell porous material, the air permeability of the pores communicating with the outside air of the closed cells and the air permeability of the filling portion.

  The other means is the biological deodorization apparatus according to claim 3 or 4, further comprising nutrient water supply means for supplying nutrient salt and water. Thus, by providing the nutrient water supply means, the microorganisms carried on the porous material as the microorganism carrier can be activated, and a biological deodorization apparatus with improved deodorization performance can be obtained.

  Another means is the biological deodorization apparatus according to claim 3, wherein the mixing ratio of the microorganism carrier and the closed-cell porous material is halved. As a result, the porous material with closed cells becomes an aggregate, and the biodeodorization apparatus is obtained in which the collapse in the filling portion filled with the porous material supporting microorganisms is prevented, the air permeability is ensured, and the deodorization performance is improved. It is done.

  Another means is the biological deodorization apparatus according to any one of claims 3 to 6, wherein agar is supported on a porous material of closed cells. As a result, the porous material with closed cells becomes an aggregate, and the biodeodorization apparatus is obtained in which the collapse in the filling portion filled with the porous material supporting microorganisms is prevented, the air permeability is ensured, and the deodorization performance is improved. It is done.

  The biological means according to any one of claims 3 to 7, wherein the other means includes a rotating body including an inner cylinder and an outer cylinder, and a filling portion is provided between the inner cylinder and the outer cylinder of the rotating body. This is a deodorizing device. Thereby, the contact performance of the porous material carrying microorganisms and the deodorized gas that is the gas to be treated is improved, and a biological deodorization apparatus with improved deodorization performance is obtained.

  The other means is the biological deodorization apparatus according to claim 8, wherein the rotating body is rotated periodically or intermittently. Thereby, by rotating the rotating body periodically or intermittently, the air permeability in the filling portion filled with the porous material is improved, and the porous material carrying the microorganism and the gas to be treated The contact performance with the deodorizing gas is improved, and a biological deodorizing apparatus with improved deodorizing performance is obtained.

  The other means is the biological deodorization apparatus according to any one of claims 3 to 9, wherein the open-cell porous material and the closed-cell porous material are polyurethane. As a result, the elasticity of polyurethane can be used, and even if an external force such as flowing water pressure is applied, the porous material is broken and is not easily subdivided, and it is washed away from the filling portion filled with the porous material by subdivision. In addition, the biological deodorization apparatus having the air permeability in the filling portion filled with the porous material and improved deodorization performance can be obtained.

  The other means is the biological deodorization apparatus according to any one of claims 3 to 10, wherein the open-cell porous material is a cube. Thereby, by making the porous material of open cells into a cube, the air permeability in the filling part filled with the porous material is ensured, and the biological deodorization apparatus with improved deodorization performance is obtained.

  According to the present invention, a sufficient amount of microorganisms are supported on a porous microbial carrier, that is, a porous material, the start-up characteristics of biological deodorization performance are improved, and / or the grown microorganisms, that is, surplus sludge microorganisms Separation and removal performance from the carrier is improved, air permeability of the pores of the porous microbial carrier is secured, and / or porous even if an external force such as flowing water pressure is applied to the porous microbial carrier, that is, the porous material. A microbial carrier and a biological deodorizing apparatus that improve the biological deodorizing performance because the material is not easily broken and subdivided can be obtained.

The figure which shows the outline | summary of the method to carry | support agar to the porous material of Embodiment 1 of this invention. Cross-sectional view of the biological deodorization apparatus of Embodiment 2 Overview of the front cross section

  The invention according to claim 1 of the present invention is a microorganism carrier in which agar is supported on a porous material, which accelerates the loading of a sufficient amount of microorganisms on the porous material and improves the start-up characteristics of the biological deodorization performance. be able to.

  The invention according to claim 2 of the present invention is the microorganism carrier according to claim 1, wherein the porous material is open-celled, and ensures the air permeability of the porous material and has a specific surface area for supporting microorganisms. Can improve the biological deodorization performance.

  Further, the invention according to claim 3 of the present invention comprises a filling part that mixes and fills the microorganism carrier according to claim 2 and the porous material of closed cells, and supplies a gas to be treated to the filling part. It is a deodorization device, and the porous material with closed cells becomes an aggregate, prevents crushing in the filling portion filled with the porous material supporting microorganisms, ensures air permeability, and improves deodorization performance. be able to.

  The invention described in claim 4 of the present invention is the biological deodorization apparatus according to claim 3 provided with running water washing means for washing the microorganism carrier, and the running water washing means cleans the microorganism carrier with running water. The microorganisms grown by this process, that is, excess sludge, are effectively removed and removed from the open-cell and closed-cell porous material of the microbial carrier, ensuring the breathability of the open-cell porous material that is the microbial support and independent. The air permeability of the pores communicating with the outside air of the bubbles and the air permeability of the filling portion can be secured, and the deodorizing performance can be improved.

  Further, the invention according to claim 5 of the present invention is the biological deodorization apparatus according to claim 3 or 4 provided with nutrient salt water supply means for supplying nutrient salt and water, and comprises nutrient salt water supply means. Thus, the microorganisms supported on the porous material as the microorganism carrier can be activated, and the deodorizing performance can be improved.

  The invention according to claim 6 of the present invention is the biological deodorization apparatus according to claim 3, wherein the mixing ratio of the microorganism carrier and the closed-cell porous material is halved. Becomes an aggregate, prevents crushing in a filling portion filled with a porous material supporting microorganisms, ensures air permeability, and improves deodorization performance.

  The invention according to claim 8 of the present invention is the biological deodorization apparatus according to any one of claims 3 to 6, wherein the agar is supported on the closed cell porous material, and the closed cell porous material. Becomes an aggregate, prevents crushing in a filling portion filled with a porous material supporting microorganisms, ensures air permeability, and improves deodorization performance.

  The invention according to claim 9 of the present invention includes a rotating body provided with an inner cylinder and an outer cylinder, and a filling portion is provided between the inner cylinder and the outer cylinder of the rotating body. Any one of the biological deodorization apparatuses described above can improve the contact performance between the porous material carrying microorganisms and the deodorization gas as the gas to be treated, and can improve the deodorization performance.

  The invention according to claim 9 of the present invention is the biological deodorization apparatus according to claim 8, wherein the rotating body is rotated periodically or intermittently, and the rotating body is rotated periodically, or By intermittently rotating the porous material, the porous material is agitated and moved in the filled portion, and the air permeability in the filled portion filled with the porous material is improved. The contact performance between the porous material carrying the catalyst and the deodorized gas that is the gas to be treated is improved, and the deodorizing performance can be improved.

  The invention according to claim 10 of the present invention is the biological deodorization apparatus according to any one of claims 3 to 9, wherein the open-cell porous material and the closed-cell porous material are polyurethane. The elasticity of polyurethane can be used, and even if an external force such as flowing water pressure is applied, the porous material is broken and difficult to be subdivided, and the porous material is not washed away from the filling portion filled with the porous material by subdivision. The air permeability in the filling part filled with the quality material is ensured, and the deodorizing performance can be improved. By supporting agar on the polyurethane, the hardness of the polyurethane is increased, the polyurethane can be prevented from being crushed due to being too soft, and the air permeability in the filling portion filled with the porous material can be maintained. Polyurethane can have moderate hardness and elasticity.

  The invention described in claim 11 of the present invention is the biological deodorization device according to any one of claims 3 to 10 in which the open-cell porous material is a cube, and the open-cell porous material is By making it a cube, the air permeability in the filling part filled with the porous material is ensured, and the deodorizing performance can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a method for supporting agar on the porous material according to Embodiment 1 of the present invention. The method for supporting agar on the porous material is not limited to the following, as long as the agar can be supported on the porous material.

  As the open-cell porous material, for example, a commercially available open-cell polyurethane foam A1 and as the closed-cell porous material, for example, a commercially available closed-cell polyurethane foam B2 is added to the wire mesh cage 3 and the volume of the wire mesh cage 3. The wire mesh basket 3 containing the open-cell polyurethane foam A1 and the closed-cell polyurethane foam B2 is immersed in the agar solution 5 of the container 4.

  The open-cell polyurethane foam A1 and the closed-cell polyurethane foam B2 have, for example, a size of approximately 10 mm cubic, a pore diameter of 1 to 1.1 mm, a porosity of 96 to 97%, and a hardness of 240 to 300N.

  The agar solution 5 is, for example, powder agar in water and heated to 90 ° C. or higher, and there as nutrient sources, for example, nutrient salts such as ammonium sulfate, potassium dihydrogen phosphate, and a carbon source, if necessary. For example, it is obtained by adding granulated sugar, dissolving powder agar and mixing. In this example, ammonium sulfate 50 mg / L and potassium dihydrogen phosphate 50 mg / L are added as nutrient salts, granulated sugar 500 mg / L is added as a carbon source, powder agar is dissolved, mixed, An agar solution 5 is obtained.

  An appropriate number of open-cell polyurethane foams A1 and an appropriate number of closed-cell polyurethane foams B2 are placed on the wire mesh cage 3 immersed in the agar solution 5, and then a rod 7 provided on the metal mesh flat plate 6 is attached. When the open-cell polyurethane foam A1 and the closed-cell polyurethane foam B2 are pressed by the metal mesh flat plate 6, the open-cell polyurethane foam A1 and the outside air in the closed-cell polyurethane foam B2 communicate with each other. The air in the pores escapes as bubbles, the agar solution 5 enters there, the pores communicating with the outside air are filled with the agar solution 5, and the agar is carried in the pores. Agar is carried in pores communicating with the surface and outside air. When the generation of air bubbles ceases, pressurization by the metal mesh flat plate 6 is stopped, and the open cell polyurethane foam A1 and closed cell polyurethane foam B2 are pulled up from the container 4 into the air for each of the metal mesh cages 3 to cut the solution. For example, it is spread on a vinyl sheet and cooled to 40 ° C. or less by applying it to wind to solidify the agar to obtain a porous microbial carrier carrying the agar of the present invention, that is, a porous material carrying microorganisms. It was.

  The pores in the closed-cell polyurethane foam B2 are not in communication with the outside air, but some of the pores on the surface may be in communication with the outside air due to half cracks, etc. Air in the pores communicating with the outside air escapes as bubbles, and the agar solution 5 enters there, and the pores are filled with the agar solution 5 and the agar is carried in the pores. . Agar is carried in pores communicating with the surface and outside air.

  Due to the above structure, the surface of polyurethane, which is a porous material that is not well-adapted to water, and agar containing nutrient salts are supported on the entire inner surface of the pores communicating with the outside air, and the familiarity with microorganisms is improved. As a result, the microorganism adhesion characteristics and the microorganism adhesion rising characteristics are improved, a sufficient amount of microorganisms can be carried on the porous material, and the microorganism carrier capable of improving the biological deodorizing performance rising characteristics is provided.

  The open-cell porous material only needs to have open-cell pores communicating with the outside air, and includes open-cell polyurethane foam, porous ceramic, zeolite, diatomaceous earth, and the like. As the closed-cell porous material, there may be closed-cell pores that do not communicate with the outside air, and examples thereof include closed-cell polyurethane foam, urethane sponge, and polystyrene foam.

  The mesh of the metal mesh cage 3 and the mesh of the metal mesh flat plate 6 need only be such that the polyurethane foam itself does not come out when pressurized, and is, for example, about 3 mm. The material of the metal mesh cage 3 and the metal mesh flat plate 6 may be heat-resistant, for example, SUS.

  The shape of the porous material should be such that there is an unnecessarily large gap between the filled porous materials so that the gas to be treated is not short-circuited in the filled portion filled with the porous material. There are cuboids.

(Embodiment 2)
FIG. 2 shows a cross-sectional view of the biological deodorization apparatus of Embodiment 2 of the present invention, and FIG. 3 shows a schematic diagram of the front cross-section. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 2 and 3, the biological deodorization apparatus 8 includes a rotating body 11 including an inner cylinder 9 and an outer cylinder 10, and agar is formed between the inner cylinder 9 and the outer cylinder 10 as a filling portion 12. The supported open-cell polyurethane foam A41 and closed-cell polyurethane foam B42 are filled. The filling portion is filled to the extent that the filling portion 12 is filled, and the filling portion 12 is filled with the open-cell polyurethane foam A41 carrying agar and the closed-cell polyurethane foam B42 carrying agar. ing. The inner cylinder 9 and the outer cylinder 10 are connected to a rotating shaft 14 that is rotated by a motor 13, and the inner cylinder 9 and the outer cylinder 10 are rotated by the motor 13 via the rotating shaft 14. The center of the inner cylinder 9 and the center of the outer cylinder 10 coincide with each other, and a rotating shaft 14 is provided at the center of the inner cylinder 9 and the outer cylinder 10 that coincide with each other. A partition wall 15 is provided between the inner cylinder 9 and the outer cylinder 10 radially from the center of the inner cylinder 9 and the outer cylinder 10 to divide the filling portion 12.

  In the present embodiment, the filling portion 12 is radially divided into eight equal parts. In this embodiment, a cylinder is used, but a polygonal square tube may be used. For example, an octagonal square tube may be used. The partition wall 15 is a rust-proof, non-permeable and water-permeable wall, such as a SUS board.

  An inflow duct 16 into which a gas containing a volatile organic compound (VOC) component, which is a gas to be processed, flows is connected to the inner cylinder 9 via a connecting means such as a bearing (not shown). The gas containing the volatile organic compound (VOC) component that has flowed into the inner cylinder 9 flows into the filling portion 12 from the inner cylinder surface 17 of the inner cylinder 9. The inner cylinder surface 17 of the inner cylinder 9 and the outer cylinder surface 18 of the outer cylinder 10 have a mesh and through-hole structure, and the outer cylinder side surface 19 of the outer cylinder 10 is a wall having no air permeability and water permeability. The space surrounded by the inner cylindrical surface 17, the outer cylindrical surface 18 and the outer cylindrical side surface 19 is used as the filling portion 12, and the meshes and through-holes of the inner cylindrical surface 17 and the outer cylindrical surface 18 are filled in the filling portion 12. Is smaller than the closed cell polyurethane foam A41 on which agar is supported and the closed cell polyurethane foam B42 on which agar is supported, so that the polyurethane foam A41 and polyurethane foam B42 do not fall off the filling portion 12. Examples of the mesh and the through hole of the inner cylindrical surface 17 and the outer cylindrical surface 18 include punching metal.

  In the second embodiment of the present invention, the outer cylinder 10 is φ2500 × 400 L, the inner cylinder 9 is φ900 × 400, the gas flow rate to be processed is 4 Nm 3 / min, and the gas flow velocity of the inner cylinder surface 17 is about 0.07 m / min. s, the to-be-processed gas passing wind speed of the outer cylindrical surface 18 is set to about 0.03 m / s.

  The inflow and supply of the gas containing the volatile organic compound (VOC) component, which is the gas to be treated, is not shown in the figure, but the inflow and supply by a blower or the gas to be treated and the biological deodorizing device 8 Inflow and supply to the biological deodorizing device 8 due to the pressure difference between the two and the like.

  The material of the inner cylinder 9 and the outer cylinder 10 is preferably a rust-proof type, such as SUS. The mesh and the through-hole of the inner cylinder surface 17 desirably reduce the pressure loss of the gas to be processed and the gas containing the volatile organic compound (VOC) component that passes therethrough. In this embodiment, for example, the inner cylinder surface Through-holes are provided substantially evenly on substantially the entire surface of 17, the hole diameter of the through-holes is about φ5 mm, and the porosity is about 85%.

  The gas containing the volatile organic compound (VOC) component passes through the filling portion 12 between the inner cylinder 9 and the outer cylinder 10 at a passing air velocity of about 0.035 m / s, and the agar filled in the filling portion 12 is supported. In contact with microorganisms carried on each of the open-cell polyurethane foam A41 and the closed-cell polyurethane foam B42 carrying agar, and deodorized and purified by the deodorizing and purifying action of the carried microorganisms. The body 11 enters the cover 20 of the biological deodorization apparatus 8 and is discharged from a discharge duct 21 connected to the cover 20.

  With the above configuration, the gas to be treated diffuses and passes radially from the inner cylinder 9 centered in the filling portion 12, and the use of the open cell polyurethane foam A41 carrying the porous material agar as the microbial carrier. The use of closed cell polyurethane foam B42 with improved a specific surface area for supporting microorganisms and porous material agar allows the closed cell polyurethane foam B42 with agar to serve as an aggregate. In addition, the filling part filled with the microbial carrier is prevented from being crushed and air permeability is ensured, and the agar support accelerates the loading of a sufficient amount of microorganisms to the porous material and improves the start-up characteristics of the biological deodorization performance. Thus, a biological deodorizing device that improves the biological deodorizing performance can be provided.

  As the biological deodorization progresses, the microorganisms carried on the polyurethane foams A41 and B42 carrying the porous material agar grow, and when the microorganisms grow more than necessary, the polyurethane carrying the porous material agar The pores of the foams A41 and B42 are blocked, the gas permeability of the gas to be treated is lowered, and the contact between the gas to be treated and the microorganisms is lowered, and the biological deodorizing function is lowered. In order to remove and remove the microorganisms that grew more than necessary, that is, excess sludge from the polyurethane foams A41 and B42 carrying agar, and to restore the air permeability and the contact between the microorganisms, running water washing using running water pressure was performed. The function will be described below.

  Wash water 22 is poured into a water tank 29 at the bottom of the biological deodorization device 8, and the wash water 22 filtered by the filter 24 is absorbed from a water suction pipe 25 by a pump 23 as running water washing means, and passes through a water supply pipe 26. Then, water is supplied from the water supply port 27 to the filling portion 12 filled with the open cell polyurethane foam A41 carrying agar and the closed cell polyurethane foam B42 carrying agar. For example, when the filling unit 12 is divided into eight parts and the capacity of the divided filling part 28 divided into one-eighth is 0.178 m 3, the size of the water supply port 27 of the water supply pipe 26, for example, the nominal diameter is set. 30A, and the side surface of the rotating body 11 is divided into approximately four equal parts on the vertical line at the center of the outer cylinder 10, and the total water supply amount is 15 m3 / hr for approximately 10 minutes from two places that are ¼ inward from both ends of the side surface. Water is supplied to the divided filling unit 28, and the polyurethane foam A41 carrying agar as a microorganism carrier and the polyurethane foam B42 carrying agar are washed with running water. Although not shown, all the divided filling portions 28 are filled with open-cell polyurethane foam A41 carrying agar and closed-cell polyurethane foam B42 carrying agar.

  Rotating body 11 is rotated by a motor in divided filling portion 28 divided into 1/8 when cleaning is performed, and partition plates 15a and 15b on both sides of partition plate 15 of divided filling portion 28 where cleaning is performed are inside. The tube 9 and the outer tube 10 are made symmetrical with respect to the center line 30 and washed with running water. The divided filling portion 28 for cleaning is located below the other divided filling portions. The rotating body 11 is rotated about once every 8 hours to 12 hours, and the divided filling unit 28 is washed with running water one after another.

  The division filling portion 28 is surrounded by the outer cylinder side surface 19 of the outer cylinder 10, the partition wall 15, the inner cylinder surface 17, and the outer cylinder surface 18, and the outer cylinder side surface 19 and the partition wall 15 of the outer cylinder 10 are air permeable. It is a SUS plate having no water permeability, the outer cylindrical surface 18, that is, the divided outer cylindrical surface 31 of the divided filling portion 28 becomes the bottom surface, and the cleaning water 22 supplied by the pump 23 falls from the divided outer cylindrical surface 31 on the bottom surface. Although the water flows, if the void ratio of the outer cylindrical surface 18, that is, the divided outer cylindrical surface 31, is decreased, the water supply amount of the cleaning water by the pump 23 falls from the divided outer cylindrical surface 31, and the divided water flows. When washing water begins to accumulate in the filling portion 28 and the water level of the washing water in the divided filling portion 28 becomes high, the amount of water falling or flowing from the divided outer cylinder surface 31 due to the stored water pressure increases, and is balanced with the amount of water supplied from the water supply port 27. The water level is maintained. At the maintained water level, a swirling flow of the washing water occurs in the split filling unit 28 due to the water supply from the water supply port 27, and the polyurethane foam A41 carrying the agar and the agar are carried by the flowing water pressure of the swirling flow. The excessively grown microorganisms, that is, excess sludge are peeled off and removed from the polyurethane foam B42, and the polyurethane foam A41 carrying agar and the polyurethane foam B42 carrying agar are communicated with the outside air. The air permeability in the hole is recovered and maintained, and the air permeability in the divided filling portion 28 is maintained. The divided outer cylinder surface 31, that is, the outer cylinder surface 18, is sufficient if the cleaning water is stored without overflowing in the divided filling portion 28 and a swirling flow of the cleaning water occurs in the divided filling portion 28. It is composed of SUS punching metal with φ5 × porosity 19%.

  Washing with running water is performed for about 10 minutes per time. If the divided filling unit 28 is cleaned sequentially, for example, once every 12 hours, the rotating body 11 is rotated to perform cleaning, in the case of eight divisions, the cleaning of all the divided filling units 28 is 4 A day later. The cleaning interval may be appropriately determined in view of the cleaning time, the growth rate of microorganisms, the amount of excess sludge, and the degree of excess sludge peeling.

  During running water cleaning or while the washing water is present in the divided filling unit 28 without being dried, the ventilation resistance of the gas containing the volatile organic compound (VOC) component which is a non-treatment gas is generated, and the running water washing is completed. However, when the inside of the split filling unit 28 is dried, the resistance of the gas to be processed decreases, the air amount of the gas to be processed fluctuates and the air pressure at the gas source to be processed changes, and the production at the gas source to be processed occurs. If there is an adverse effect on the process, etc., and if the production process of the gas source to be processed is adversely affected, the cleaning target is divided in order to keep the non-processing gas ventilation resistance of the divided filling portion 28 to be cleaned constant. The lower end 32 of the filling portion 28 is submerged in about 20 mm of cleaning water to eliminate fluctuations in the gas flow resistance of the gas to be processed so as not to adversely affect the production process in the gas generation source.

  When the divided filling portion 28 is submerged in the wash water, the portion of the microbial carrier that is submerged in the wash water does not come into contact with the non-treatment gas, and thus the biological deodorization is not performed. What is necessary is just to sink so that a fluctuation | variation of gas ventilation resistance may be eliminated. In the present embodiment, as described above, the lower end 32 is submerged by about 20 mm. When there is no need to change the air pressure at the non-process gas generation source, the lower end 32 of the divided filling portion 28 to be cleaned is not submerged in the wash water, but is taken out into the air so that all microbial carriers come into contact with the gas to be processed. To improve the performance of biological deodorization.

  Note that when flowing water cleaning of the divided filling unit 28 is started, the ventilation resistance of the gas to be processed fluctuates and the pressure at the gas to be processed fluctuates, but the pressure fluctuation at the gas to be processed at the start of flowing water cleaning changes. Is provided with a mitigating means for mitigating pressure fluctuations at the gas generation source to be treated at the start of flowing water cleaning, and the lower end 32 of the split filling portion 28 to be cleaned is higher than the water level of the cleaning water 22 in the water tank 29, Even when the water level or higher, that is, when it is discharged into the air without being submerged in the wash water 22 of the water tank 29, it may be possible not to adversely affect the production process due to the change in air pressure at the processing gas generation source. As the mitigation means, for example, the rotational speed of the blower that supplies the gas to be treated is inverter-controlled to reduce the static pressure fluctuation of the blower. For example, when the static pressure of the blower at the time of supplying the gas to be treated is 400 Pa, about 10% of 40 Pa is reduced by inverter control over about 30 minutes before the start of cleaning, and static control is performed by inverter control simultaneously with the start of cleaning. Compensate for pressure drop. Alternatively, the pressure at the gas source to be processed is detected by the pressure sensor, and the fluctuation in the pressure at the gas source to be processed is mitigated by the detected value, which adversely affects the production process due to the change in air pressure at the gas source to be processed. The blower may be inverter-controlled to the extent that it is not given.

  In this case, when drying proceeds and the gas to be treated starts to flow after the cleaning of the divided filling unit 28 to be cleaned, the microbial carrier filled in the divided filling unit 28 to be cleaned and the gas to be processed come into contact with the biological deodorization. Will be performed. The divided filling unit 28 to be cleaned is also subjected to biological deodorization simultaneously with drying. As the mitigation means, there is a damper provided in the inflow duct 16 in addition to the inverter control of the blower, and the ventilation resistance of the gas to be treated may be varied and mitigated by the damper or the like. The lower end of the filling unit 12, that is, the lower end 32 of the divided filling unit 28 to be cleaned is higher than the water level of the water tank 29 and is not submerged in the cleaning water 22 of the water tank 29. Even when the lower end 32 of the target divided filling unit 28 is put out into the air, the pressure fluctuation at the processing gas generation source is alleviated, and the production process at the processing gas generation source is not adversely affected.

  The separated and removed sludge is filtered by the filter 24 or accumulated on the bottom surface of the water tank 29 at the bottom of the biological deodorizing device 8 and appropriately discharged. In addition, although the bottom face of the water tank 29 below the biological deodorizing apparatus 8 is a flat plate, a valve (not shown) connected to the bottom face in a cylindrical or conical shape so that sludge accumulated on the bottom face of the water tank 29 can be easily discharged. The sludge may be discharged by opening and closing the valve.

  By using the open cell polyurethane foam A41 carrying agar as the porous material of the microorganism carrier and the closed cell polyurethane foam B42 carrying agar, the polyurethane is elastic, and the polyurethane foam by the agar support. The hardness of the body is improved, the porous material is broken and difficult to be subdivided, and the microbial carrier is prevented from being crushed by being too soft, so that the porous material 41 and 42 of the microbial carrier, the filling part 12, and the biological deodorization device The air permeability of 8 is ensured and maintained, and the biological deodorization performance is improved.

  According to the above configuration, the ability to peel and remove the grown microorganisms, that is, excess sludge from the microorganism carrier, is improved, the air permeability of the pores of the porous microorganism carrier is ensured, and the porous microorganism carrier, that is, the porous material Even when an external force such as flowing water pressure is applied, the porous material is broken and is not easily subdivided, and a biological deodorizing device that improves the biological deodorizing performance can be provided.

  As the nutrient salt, for example, the chemical solution 35 and water of ammonium sulfate and potassium dihydrogen phosphate are supplied from the chemical solution injection port 36 by the chemical solution pump 34 from the chemical solution tank 33 in which 50 mg / L each of ammonium sulfate and potassium dihydrogen phosphate are dissolved. Water is poured into the water tank 29. The pump 23 as running water washing means pours and feeds water into the filling section 12 filled with the open-cell polyurethane foam A41 carrying agar and the closed-cell polyurethane foam B42 carrying agar, and the nutrients Is supplied, and the microorganisms carried on the polyurethane foams A41 and B42 carrying the agar are activated. Alternatively, the microorganisms supported on the agar-supported polyurethane foams A41 and B42 may be activated by directly pouring and sprinkling the agar-supported polyurethane foams A41 and B42 which are the microbial carriers of the filling portion 12. . Periodically, for example, about once a day, the chemical solution and water are injected and sprinkled. Only chemicals may be used.

  The rotating body 11 is periodically rotated by the motor 13, for example, about once a day, or intermittently rotated to stir the porous material in the filling part 12 filled with the porous material, It moves, improves the air permeability in the filling part 12 filled with the porous material, improves the contact performance between the porous material carrying microorganisms and the deodorized gas that is the gas to be treated, and improves the deodorizing performance. be able to.

  The microbial carrier and the biological deodorizing apparatus according to the present invention have improved start-up characteristics of the biological deodorizing performance, and the air permeability of the pores of the porous microbial carrier and the air permeability of the filling portion filled with the porous microbial carrier. It is ensured and can improve the biological deodorization performance, and is useful for deodorizing odorous gases such as factory exhaust gas or livestock barn, and purifying contaminated air.

1 Open cell polyurethane foam A
2 Closed cell polyurethane foam B
DESCRIPTION OF SYMBOLS 3 Wire mesh basket 4 Container 5 Agar solution 6 Wire mesh flat plate 7 Bar 8 Biological deodorizing device 9 Inner cylinder 10 Outer cylinder 11 Rotating body 12 Filling part 23 Pump 25 Water absorption pipe 26 Water supply pipe 27 Water supply port 28 Divided filling part 31 Split outer cylinder surface 32 Lower end 33 Chemical liquid tank 34 Chemical liquid pump 36 Chemical liquid water inlet 41 Open-cell polyurethane foam A carrying agar
42 Polyurethane foam B with closed cells carrying agar

Claims (11)

  A microbial carrier in which agar is supported on a porous material.   The microorganism carrier according to claim 1, wherein the porous material is open-celled.   A biological deodorization apparatus comprising a filling unit for mixing and filling the microbial carrier according to claim 2 and a closed-cell porous material, and supplying a gas to be treated to the filling unit.   The biological deodorization apparatus according to claim 3, further comprising running water cleaning means for cleaning the microorganism carrier.   The biological deodorization apparatus according to claim 3 or 4, further comprising nutrient water supply means for supplying nutrient salt and water.   The biological deodorization apparatus according to claim 3, wherein a mixing ratio between the microorganism carrier and the porous material of closed cells is halved.   The biological deodorization apparatus according to any one of claims 3 to 6, wherein agar is supported on a closed-cell porous material.   The biological deodorization apparatus according to any one of claims 3 to 7, further comprising: a rotating body including an inner cylinder and an outer cylinder, wherein a filling portion is provided between the inner cylinder and the outer cylinder of the rotating body.   The biological deodorization apparatus according to claim 8, wherein the rotating body is rotated periodically or intermittently.   The biological deodorization apparatus according to any one of claims 3 to 9, wherein the open-cell porous material and the closed-cell porous material are polyurethane.   The biological deodorization apparatus according to any one of claims 3 to 10, wherein the open-cell porous material is a cube.

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