JPH04363111A - Organism deodorizing method - Google Patents

Abstract

PURPOSE:To lower the height of an equipment and to rationally control the amount of washing water sprayed to the layer of a filler by passing offensive gas through the inside of a treating tower in the nearly horizontal direction and gradually reducing the amount of washing water sprayed to the layer of the filler toward the outlet side of offensive gas in the inside of the treating tower from the inlet side thereof. CONSTITUTION:When offensive gas is blown through the layers 5 of fillers in the respective blocks in the inside of a treating tower 1 in the nearly horizontal direction toward the outlet side 3 of the tower 1 from the inlet side 2 thereof, the offensive component contained in the gas is oxidatively decomposed by microorganisms such as sulfur fungi carried on the fillers. At this time, sulfate ions of the amount nearly equal to the decomposed amount thereof are produced in the layers 5 of fillers and pH is lowered and the biological reaction of microorganisms is inhibited. The produced amount of sulfate ions is maximum in a first block 4-I wherein offensive gas is firstly brought into contact with the layers 5 of fillers and gradually reduced toward a fifth block 4-V. Therefor, the respective flow rate controlling valves 12 are adjusted and the amount of washing water sprayed to the layer 5 of filler of the first block 4-I is made maximum. The amount of washing water sprayed toward the fifth block 4-V is successively reduced.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is directed to the use of malodor containing malodorous components such as ammonia, hydrogen sulfide, methyl mercaptan, methyl sulfide, and methyl disulfide, which are generated in human waste treatment plants, sewage treatment plants, and other various industrial wastewater treatment plants. This invention relates to a biological deodorizing method for deodorizing gas.

0002

[Prior Art] According to Japanese Patent Application Laid-open No. 2-126918, the present applicant provided a packing layer carrying microorganisms that decompose malodorous components in a treatment tower, and sprayed washing water onto the packing material layer to clean it. However, we have proposed a biological deodorization method in which malodorous gas is vented into the treatment tower, and the malodorous components in the malodorous gas are decomposed by microorganisms supported by the packed bed.

[0003] In the above-mentioned conventional apparatus, multiple layers of packing material are provided vertically apart from each other inside a vertically long treatment tower, and washing water is sprayed from above to the packing material layers in each of the upper and lower stages, and the filling material in the lower stage is sprayed with washing water. In order to minimize the consolidation of the material layer due to water sprinkling, a water pipe is installed on the water sprinkling pipe to the lower filling material layer to allow gas flowing upward, but to prevent the water from flowing down, allowing it to flow out of the treatment tower. A special partition plate is installed to drain water.

0004

[Problems to be Solved by the Invention] Providing the partition plate in this manner complicates the structure and requires a long vertical distance between the upper filler layer and the lower filler layer. Therefore, the height of the treatment tower becomes high, the equipment becomes large, and the cost increases.

[0005]

[Means for Solving the Problems] The present invention has been developed to solve the above-mentioned problems, and includes a cleaning method in which foul-smelling gas is vented almost horizontally into a treatment tower and is sprayed onto a bed of packing material. The amount of water sprayed was gradually reduced from the inlet side of the malodorous gas in the treatment tower toward the outlet side.

[0006]

[Embodiment] In the illustrated embodiment, reference numeral 1 denotes a treatment tower that is long in the horizontal direction, and a malodorous gas is supplied into the tower from the inlet side 2 at one end in the longitudinal direction, and the inside of the tower is ventilated almost horizontally. It is discharged from the outlet side 3 at the other end.

The inside of the tower is divided into multiple blocks from the inlet side 2 to the outlet side 3, five blocks 4-I, 4-II...4-V in the figure, and each block carries microorganisms such as sulfur bacteria that decompose malodorous components. A filler layer 5 mainly composed of long peat fibers is provided,
Above is a water spraying device 6 that sprays washing water continuously or intermittently from above onto the filler layer of each block, and below is a water sprayer 6 that sprays washing water from each sprayer onto each filler layer and flows down through the filler layer. A common water tank 7 is provided to receive wash water.

A porous support plate 8 serving as the lower surface of the five blocks is installed horizontally on the water surface of the aquarium 7, and a net-like or perforated partition plate 9 is installed vertically thereon to partition the five blocks. A filler mainly composed of long peat fibers is filled between the plates 9 to form a filled layer 5. And the water sprinkler 6
is a water spray nozzle 10 that sprays cleaning water onto each filler layer 5...
, a common cleaning water supply pipe 11 , and a flow rate control valve 12 for connecting each water spray nozzle to the cleaning water supply pipe 11 .

In order to deodorize the malodorous gas, as described above, the malodorous gas is vented into the tower in a substantially horizontal direction from the inlet side 2 of the treatment tower 1 toward the outlet side 3 at the other end. When the gas blows through the filler layer 5 of each block in the gas, the microorganisms supported by the filler in the layer oxidize and decompose the malodorous components in the gas.

[0010] When the microorganisms in each filler layer oxidize and decompose the malodorous components, sulfate ions are generated in the filler layer in an amount approximately equal to the decomposed amount, and the pH decreases. inhibits the product reaction of microorganisms. The amount of sulfate ions produced is maximum in the first block 4-I, where the malodorous gas first contacts the filler layer, and gradually decreases toward the fifth block 4-V. Therefore, each flow control valve 12 is adjusted, and the first
The amount of washing water sprayed on the filler layer of block 4-I is maximized, and the amount of washing water sprayed toward the fifth block is gradually decreased.

[0011]

Effects of the Invention According to the present invention, the height of the treatment tower can be reduced because the malodorous gas is deodorized by venting it almost horizontally into the treatment tower. The amount of cleaning water sprayed on the filler layer is increased at the inlet side where the amount of decomposed malodorous components is high, and gradually decreases toward the outlet side where the amount of decomposed malodorous components is low, thereby ensuring rational use of the cleaning water. Cleaning can be done by

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a biological deodorization device implementing the method of the present invention.

[Explanation of symbols]

1. Processing tower 2 Entrance side 3 Exit side 4 Blocks inside the processing tower 5 Filler layer 6. Watering device

Claims (1)

[Claims] Claim 1: A packing material layer carrying microorganisms that decompose malodorous components is provided in a treatment tower, and while washing water is continuously or intermittently sprayed onto the packing material layer, the treatment tower is cleaned. In a biological deodorization method in which malodorous gas is aerated, malodorous components in the malodorous gas are decomposed by microorganisms carried by the packed bed, and the odor is deodorized, the malodorous gas is aerated into the treatment tower in a substantially horizontal direction, and the packing material A biological deodorizing method characterized by gradually decreasing the amount of washing water sprayed on a bed from the inlet side of the malodorous gas in the treatment tower toward the outlet side.