JPH03229613A - Biological deodorization device - Google Patents

Abstract

PURPOSE:To achieve deodorization and prevent environmental pollution by providing a packed layer comprising a lower layer having large voids and an upper layer, located on the lower layer, having small voids. CONSTITUTION:Each packed layer is made up of a lower layer A having large voids in which block-like packings 7 or cylindrical packings 8 are arranged and an upper layer B, located on the lower layer, having small voids in which filaments of beet are arranged as packings. Gas of bad smell blown into the lower interior of a treatment column flows upwardly through the packed layers 2, while malodorous components of the gas are oxidized and decomposed by bacteria carried by said layers, so that the gas, treated gas, is discharged from an outlet 4. The malodorous gas, from which malodorous components have been partially removed, flows through the upper layer B, where said gas is brought sufficiently into contact with bacteria carried by the layer, so that the malodorous components are removed. As a result, the packed layers are easily constructed.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is applicable to ammonia, hydrogen sulfide, methyl mercaptan, methyl sulfide, and methyl disulfide generated in human waste treatment plants, sewage treatment plants, and other industrial wastewater treatment plants. This invention relates to a biological deodorizing device for biologically deodorizing malodorous gases containing malodorous components such as.

<Prior Art> The applicant of this patent has developed a method of forming a spherical piece of plastic with an average diameter of about 150 mm into a complex combination of a curved piece with a large opening and a flat plate piece with a similarly large opening, and reducing the porosity. is about 97%, and even if they are arranged and accumulated in various positions, they will contact each other in points and lines, but not in surface contact, and microorganisms can adhere to the surface and multiply. (trade name: PIOS, manufactured by Nichinan Sangyo Co., Ltd.) is used as a filler, and this is spread in one layer on the support plate of the packed bed in a vertically long treatment tower, and inside the openings of the spread filler and the filler. Fill the adjacent voids with beet fibers to form the bottom layer (first layer) of the packed layer, and fill the bottom layer with the second layer, third layer, and so on. are piled up one after another to form an integrated packed bed. Microorganisms such as nitrifying bacteria and sulfur bacteria are inoculated into this packed bed and allowed to grow. Once the microorganisms have become accustomed to it, malodorous gas is supplied into the tower from below and the packed bed is closed. Biological deodorizing equipment that allows the gas to flow upward, oxidizes and decomposes malodorous components in the gas using microorganisms supported in a packed bed, and releases treated gas containing almost no malodorous components from the top of the tower.
I proposed it in the issue. During operation, washing water is sprinkled onto the packed bed from above using a water sprinkler to move sulfur, etc. precipitated in the packed bed down and drop from the packed bed, and it is discharged from the drain through the drain together with the washing waste water. At the same time as discharging, the moisture content of the packed bed is reduced to 50 to 8.
0%, preferably 60-70% to maintain microbial activity.

<Problems to be Solved by the Invention> Although the preceding device described above can deodorize the malodorous components in the malodorous gas supplied to the treatment tower by oxidizing and decomposing them using the microorganisms carried by the packed bed, the treatment tower It takes a lot of effort to construct a packed bed inside the tank. In other words, when the type 1 fillers of each layer from the bottom layer to the top layer of the packed layer are laid out, beet fibers must be packed in the openings of the fillers and the adjacent gaps between the fillers at the same density f. However, if the positions of the packing material in the upper and lower layers shift or the density of the packed beet fibers differs in size, the foul-smelling gas will take a short path through the packed bed and leak, causing the treated gas to be released from the top of the tower. contains malodorous components and causes pollution.

Means for Solving the Problems> Therefore, the present invention provides a packed bed that supports microorganisms that decompose malodorous components in a treatment tower, water is sprinkled onto the packed bed from above to supply water to the core layer, and the core layer is supplied with water. In a biological deodorizing device that is provided with a water sprinkler for cleaning the layer and deodorizes the foul-smelling gas by blowing the foul-smelling gas through the packed bed in an upward flow, the packed bed has a lower layer with a large porosity and an upper layer with a small porosity above it. At least one stage of the combination consisting of the following is provided.

<Example> In the illustrated example, 1 is a treatment tower, 2 is a packed bed provided in the tower, 3 is a supply port for supplying malodorous gas to the lower part of the tower, and 4 is a treatment tower.
is a discharge port for the treated gas provided at the top of the tower, 5 is a water spray pipe that sprays washing water onto the packed bed from above, 6 is a drain for washing waste water, A is the lower layer of the packed bed 2 with a high porosity, B indicates the upper layer 1 with a small porosity provided on the lower layer.

The filler with a large porosity to the lower layer may be the block-shaped filler 7 used in the previous proposal mentioned above, or a hollow cylindrical filler 8 such as a hollow honeycomb tube molded from plastic may be oriented vertically. It can also be arranged vertically. Further, the filler having a small porosity in the upper layer B may be beet fiber.

FIG. 1 shows an embodiment in which four stages of packed beds 2 are provided in the vertical direction in a column, and each stage of packed beds has a porosity of 1-type packing material 7 or cylindrical packing material 8 arranged vertically. It consists of a large lower layer +11A and an upper layer B with a small porosity that is made of beet fibers as a filler provided thereon.

In the embodiment shown in Fig. 2, the filling layer 2B1 is one high level, and the lower layer A is formed by stacking several tiers of type 1 fillers 7 vertically, or by arranging long cylindrical fillers 8 vertically. On top of that, a thick upper layer B of beet fibers is made.

The embodiment shown in FIG. 3 has two layers of upper and lower packed layers, each lower layer A of which is made up of cylindrical fillers 8 arranged vertically, and the upper layer B of which is made of beet fibers.

In either embodiment, once the lower HA is constructed, a ventilated and water permeable partition 9 such as a mesh material that prevents the upper layer beet fibers from falling is placed on top of it, and the upper layer B is created on top of the partition 9.

As a result, in each of the illustrated apparatuses, when the malodorous gas blown into the lower interior of the treatment tower flows upward in the packed bed 2, the malodorous components are oxidized and decomposed by the microorganisms supported in the core layer, and the malodorous gas is converted into treated gas. and is discharged from the discharge port 4. In this case, the lower layer A of the packed layer with a high porosity has low resistance to the upwardly flowing malodorous gas and has low pressure loss. Therefore, lower layer A
In this case, the malodorous components in the gas come into contact with the filler mainly by diffusion, and the easily decomposed HJ, NH2, etc. in the malodorous components are oxidized and decomposed by microorganisms that adhere to the filler in the lower layer.

In this way, the malodorous gas flows upward in the lower layer A of the packed bed and some of the malodorous components are removed, and then heads to the upper layer B, which has a small porosity. This upper layer B filler has a large surface area and supports a large amount of microorganisms. Therefore, the malodorous gas flows upward while causing turbulence in the upper layer B, and sufficiently contacts the microorganisms carried thereon, thereby removing malodorous components. In particular, the malodorous gas flowing upward in this upper layer contains easily decomposed H2S and N in the malodorous components.
83, etc. are removed in the lower layer and decomposed (because they contain a large amount of methyl mercaptan, methyl sulfide, etc.), they are treated with H2S.
, is oxidized and decomposed without being inhibited by NH3 concentration.

<Effects of the invention> When configuring a packed bed in a treatment tower, type 1 fillers can be spread in the lower layer of the packed bed, or cylindrical fillers can be lined up and beet fibers are piled on top to form the upper layer. Therefore, no effort is required to construct the packed bed.

[Brief explanation of drawings]

FIGS. 1, 2 and 3 each show a biological deodorizing apparatus according to an embodiment of the present invention. In the figure, 1 is a treatment tower, 2 is a packed bed, 3 is a supply port for malodorous gas, 4 is a discharge port for treated gas, 5 is a sprinkler pipe, 6 is a drain for cleaning waste water, 7 is a type 1 packing material, and 8 is a Cylindrical packing material, A is the lower layer of the filling layer, and B is also the upper layer.

Claims (1)

[Claims] A treatment tower is provided with a packed bed carrying microorganisms that decompose malodorous components, and a water sprinkler that sprays water onto the packed bed from above to supply moisture to the bed and wash the bed. , a biological deodorizing device that deodorizes malodorous gas by blowing upward flow through the packed bed, the packed bed comprising at least one stage of a combination consisting of a lower layer with a large porosity and an upper layer with a small porosity thereabove. A biological deodorizing device characterized by: