JPH05261240A - Biological deodorization tower - Google Patents

Abstract

PURPOSE:To lower the concentration of introduced offensive gas components and to treat the offensive gas to a level capable of discharging gas to the atmosphere by only biological oxidation reaction based on microorganisms by providing a washing water tank in the front stage for treating offensive gas in a deodorization layer and blowing out the introduced offensive gas into the washing water. CONSTITUTION:The introduced offensive gas is uniformly dispersed into the circulated water 5 from the blowout pipe 11 of offensive gas. Thereby, the components such as ammonia and hydrogen sulfide are dissolved into liquid by Henry's law and dissociated into ions. Then, when offensive gas is introduced into a cartridge 4 housing a carrier stuck with microorganisms and brought into contact therewith, the gas is furthermore oxidatively decomposed. Finally, the treated gas is discharged into the atmosphere from the outlet 2 thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological deodorizing device, and more particularly to a biological deodorizing device having a carrier made of a ceramic or the like having microorganisms attached thereto and washing water for cleaning the carrier.

[0002]

2. Description of the Related Art A typical example of a conventional biological deodorizer is shown in FIG.
Shown in. In conventional biological deodorizers, malodorous gas composed of hydrogen sulfide, ammonia, methyl mercaptan, etc., generated from sewage treatment plants is oxidatively decomposed by autotrophic bacteria that use these odorous components as nutrient sources to generate sulfuric acid, nitric acid, carbon dioxide gas. The concentration of malodorous gas was lowered to a level at which it could be released into the atmosphere.

However, in such a treatment method, the concentration of the original odor gas generated from the treatment plant fluctuates, and when the high concentration gas flows in, the decomposition ability of microorganisms is exceeded and the concentration of the treated gas becomes unstable. Tended to be. Therefore, in a sewage treatment plant or the like, a deodorizing device using impregnated activated carbon, which has been conventionally used, is provided as a post-treatment after the biological deodorizing device, which has a disadvantage of increasing the facility cost.

[0004]

SUMMARY OF THE INVENTION A first object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to always maintain stable processing performance even when a high-load original odor gas flows in. .. The second purpose is to supply an inexpensive biological deodorizing device by omitting the expensive impregnated activated carbon equipment added as a post-treatment.

[0005]

[Means for Solving the Problems] From the publicly available experimental data, it has been confirmed that in deodorization using microorganisms, the processing capacity decreases as the concentration of the original odor gas increases and the load increases. In order to solve this, in the present invention,
Utilizing the property that the original odorous gas components, such as ammonia and hydrogen sulfide, are dissolved in water, the inflowing original odorous gas is passed through a jet
It is designed to be ejected into circulating water for carrier washing to remove a part of malodorous components before passing through the biological deodorizing layer.

[0006]

[Example] As shown in FIG. 2, the inflowing odorous gas is uniformly dispersed in the circulating water 5 through the odorous gas jet pipe 11. As a result, components such as ammonia and hydrogen sulfide are dissolved in the liquid according to Henry's law and dissociated into ions. Then, the malodorous gas is further oxidized and decomposed by passing through the cartridge 4 accommodating the carrier to which the microorganisms are attached, and finally discharged from the processing gas outlet 2 into the atmosphere. Further, the circulating water is regularly sprayed from the spray nozzle 3 by the circulation pump 10 to prevent the carrier from drying, and at the same time, the pH decreases due to the influence of the oxidation products, so caustic soda 9 is injected to adjust the pH. I do. As a result of the above action, even when a high-load original odor gas flows in at the peak time, the entire device can be made compact without adding impregnated activated carbon to the latter stage as in the conventional case. Further, by simultaneously blowing out the gas from the ejection pipe, the gas uniformly flows in the deodorizing tower, so that the processing efficiency of the apparatus is improved. In addition, the circulating water 5 spouts the pipe 1 when the original odor gas supply is stopped.
A check valve may be provided in the vicinity of the connection between the header 12 and the ejection pipe 11 in order to prevent the flow into the header 12 side via the line 1.

[0007]

EFFECTS OF THE INVENTION It is possible to reduce the concentration of the malodorous gas component that flows in and process the gas to a level at which it can be released into the atmosphere only by a biological oxidation reaction by microorganisms. This eliminates the need for impregnated activated carbon equipment, which was necessary in the past, and can reduce the overall equipment manufacturing cost.

Further, the processing efficiency can be improved by uniformly ejecting the gas from the ejection pipe.

[Brief description of drawings]

FIG. 1 is a structural diagram of a conventional biological deodorizing device.

FIG. 2 is a structural view (elevation view) of the biological deodorizing apparatus of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1 Upper lid 2 Processed gas outlet 3 Water spray nozzle 4 Microorganism-attached carrier storage cartridge 5 Circulating water 6 PH sensor 7 Raw odor gas inlet 8 Chemical injection pump 9 Caustic soda solution 10 Circulating pump 11 Raw odor gas ejection pipe 12 Header pipe 13 Biological deodorization Tower body

Claims (1)

[Claims] 1. In a biological deodorization tower for treating a malodorous gas generated from a sewage treatment plant of a sewage treatment plant by passing it in contact with a deodorizing layer composed of a carrier to which microorganisms are attached, the above-mentioned deodorizing layer is provided in front of the deodorizing layer. A biological deodorizing device, characterized in that a jet pipe for guiding and jetting an inflowing original odor gas is provided in a washing water tank storing washing water for washing the carrier.