JP2605769Y2 - Biological deodorizer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological deodorizing apparatus for biologically decomposing and deodorizing odors discharged from human waste treatment plants, sewage treatment plants and other factories.

[0002]

2. Description of the Related Art Offensive odor components generated in the above-mentioned human waste and sewage treatment plants are mainly hydrogen sulfide, sulfur compounds such as methyl mercaptan, and ammonia, which can be decomposed by microorganisms. BACKGROUND ART A biological deodorization apparatus is used in which a malodorous gas is passed through a packed bed on which microorganisms are formed and carried for treatment.

[0003] Carriers on which microorganisms can be formed include those capable of satisfactorily forming and reproducing microorganisms and maintaining a high deodorizing efficiency for a long period of time.
, Porous ceramics, activated carbon and the like are mainly used.

[0004] In the packed bed on which the above-mentioned microorganisms are formed and supported, P by the products of the biological oxidative decomposition of the malodorous components.
It is necessary to wash and remove the product because H may decrease and the growth of microorganisms may be inhibited. The water is washed regularly.

As the water to be sprinkled, treated water by activated sludge of sewage, river water or groundwater is used. Sprinkling is carried out continuously or at predetermined time intervals, for example, water is dispersed 5 times an hour. As in the case of intermittent watering,
In the case of continuous sprinkling, the amount of sprinkling increases, the power cost increases, and the deodorizing effect decreases slightly during sprinkling.
Generally, intermittent watering is performed.

[0006]

The deodorizing effect of the biological deodorizing device depends on the biological activity of microorganisms, and is greatly affected by the temperature. Microorganisms involved in deodorization are sulfur oxidizing bacteria, nitrifying bacteria and the like.
When the temperature of the gas to be treated becomes about 10 ° C. or lower, the deodorizing effect is remarkably deteriorated.

In a conventional biological deodorizing apparatus, the gas to be treated often has a certain temperature, and the generation of offensive odor is also caused by microorganisms. No particular countermeasures have been taken against a decrease in the temperature, for example, because the temperature has decreased.

However, the temperature of the gas to be treated may be as low as 10 ° C. in winter or other seasons when the temperature becomes extremely low, especially in cold regions.
In addition, the temperature difference between daytime and nighttime becomes extremely large, the influence on the biological activity of microorganisms becomes significant, and the deterioration of the deodorizing effect cannot be ignored.

Accordingly, the present invention maintains the advantages of the biological deodorizing apparatus, which is easy to maintain and inexpensive in operating costs, and can easily cope with a decrease in temperature in winter or the like, and deodorizes as much as possible. The purpose is to develop a biological deodorizer that does not reduce its effectiveness.

[0010]

Generally, the place where the biological deodorizing device is installed is equipment related to the biological treatment device for wastewater, and the treated water discharged from the biological treatment device is always 10 units.
Focusing on maintaining a water temperature of ℃ or higher, by effectively utilizing the heat of the treated water to raise the temperature of the gas to be treated, it is possible to maintain low operating costs and simplify equipment. The inventor found out what can be done and made the present invention.

The gist of the present invention is that a gas exhaust pipe (26) is connected to the top, and a gas supply pipe (21) and a drain pipe (25) for the gas to be treated are connected to the bottom. A water sprinkler (6) for spraying water to the bed (2) and the packed bed (2), and the packed bed (2) of the treatment tower (1) for decomposing the odorous component by passing the gas to be treated upwards. ), A temperature raising means (3) for bringing the treated gas obtained by biologically treating the sewage into contact with the gas to be treated to raise the temperature of the gas to be treated is provided, and the water sprayer (6) and the temperature increasing means (3) are provided. ) And the supply of water supplied to
A biological deodorizing device comprising a control means (10) for controlling the stop at predetermined time intervals.

[0012]

The gas containing the malodorous component supplied to the processing tower 1 from the gas supply pipe 21 for the gas to be processed is contacted with the biologically treated water of the sewage while flowing through the temperature raising means 3 to be heated. While the packed bed 2 on which the microorganisms have set up is flowing in the upward flow,
Odorous components are biologically oxidatively decomposed by epiphytic microorganisms,
The exhaust gas is exhausted from the exhaust pipe 26 as a purified processing gas.

The loading of the microorganisms on the packed bed 2 is carried out in the early stage of operation by periodically spraying treated water obtained by biologically treating human waste and sewage containing microorganisms and nutrients from the water sprayer 6 to multiply and accumulate. You can live.

[0014] Watering in a steady state is carried out in order to maintain a moist state necessary for the inhabitation of microorganisms, and to wash and remove decomposition products of malodorous components and excessively growing microorganisms. Usually, watering is carried out intermittently. You.

If the gas to be treated contains a large amount of organic sulfur compounds which are not easily decomposed by microorganisms, these may remain in the treated gas. Therefore, the activated carbon adsorption tower 7 provided at the subsequent stage is usually used. As a result, it is further released to the atmosphere after being subjected to adsorption cleaning treatment.

The water used for washing the packed bed 2 and the water supplied by the temperature raising means 3 for raising the temperature of the gas to be treated are retained at the bottom of the processing tower 1 and then drained from the drain pipe 25. It is discharged out of the system through the pit 9.

The water supplied to the water sprinkler 6 and the temperature raising means 3 is supplied by controlling the flow rate or switching the flow path by the control device 10, but the water is supplied to the packed bed 2 intermittently. Alternatively, the supply of the biologically treated water in the temperature raising means 3 may be performed intermittently and discharged as respective wastewater.

However, it is preferable to continuously supply water to the temperature raising means 3 during a time period when the temperature further decreases, such as at night in winter, and a part of the water used for the temperature raising is sprayed. It may be circulated and used as water for sprinkling of No. 6.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a system diagram of one embodiment of the present invention. A processing tower 1 has a processing gas exhaust pipe 26 at the top and a gas supply pipe 21 at the bottom.
And a drain pipe 25, and a packed bed 2 carrying microorganisms therein and a water sprinkler 6 for spraying water on the packed bed 2 are provided.
Below this, a temperature raising means 3 comprising a water sprinkling pipe 4 and a contact material layer 5 is provided.

The filler layer 2 may be any carrier such as long fiber bundles, porous ceramics, and plastics, on which microorganisms can be formed. However, good growth and propagation of microorganisms, pressure loss and gas-liquid contact efficiency can be achieved. From the viewpoint of the above, it is preferable to form the filling layer 2 by bundling a number of long fiber bundles.

In the sprinkler 6, a large number of spray nozzles are arranged at substantially equal intervals on a plane so that water can be uniformly sprayed on the upper portion of the packed bed 2, and a plurality of packed beds 2 may be provided. .

A water pipe 4 provided as the temperature raising means 3
The contact member layer 5 is preferably made of a material that is hardly corroded by acid, such as ceramics or plastic, and the contact member layer 5 is made of a material that is in contact with the sprinkler tube 4 as the temperature raising means 3. The configuration is not limited to the configuration in which the material layer 5 is combined with the material layer 5 and may be any means that enables good gas-liquid contact.

Reference numeral 7 denotes an activated carbon adsorption tower, in which an activated carbon layer 8 is provided, an exhaust pipe 26 for the treated gas treated in the treatment tower 1 is connected to the lower part, and a treated gas adsorbed by the activated carbon is attached to the upper part. Is connected to an exhaust pipe 26b that discharges air.

Reference numeral 10 denotes a water sprinkler 6 and a water sprinkling pipe 4 of the temperature raising means 3.
Is a control device for controlling the flow rate of water supplied to the apparatus. The control apparatus controls opening and closing of the control valves 13a and 13b to control the supply flow rate of water and to switch the supply pipe. It is not something to be done.

Numeral 11 denotes a water supply pump for supplying water to the sprinkler 6 and the sprinkler pipe 4. If the water supplied to the sprinkler 6 and the sprinkler pipe 4 is different, the water supply pump is arranged for each supply flow path. You. Reference numeral 12 denotes an exhaust pipe 2 for discharging the processing gas.
Although the exhaust blower is provided in 6, an air supply blower may be provided in the air supply pipe 21 of the gas to be processed instead of the exhaust blower 12.

Next, the operation of deodorizing odorous gas with the biological deodorizing device having the above-mentioned structure will be described. A gas to be treated containing a malodorous component generated from a night soil treatment plant or a sewage treatment plant is supplied to the treatment tower 1 from the air supply pipe 21.

The supplied gas to be treated is brought into contact with the biologically treated water supplied from the water sprinkling pipe 4 via the heating water supply pipe 24 while flowing through the contact material layer 5 of the temperature raising means 3 in an upward flow. Then, the temperature is raised by heat exchange with the calorific value of the biologically treated water.

The heated gas to be treated further flows upward, and while flowing through the packed bed 2 carrying microorganisms in an upward flow, the odorous gas mainly composed of sulfur compounds such as hydrogen sulfide or ammonia is charged. Biologically oxidatively decomposed by the epiphytic microorganisms in the layer 2, ammonia is fixed to the packed layer 2 as nitrate ions and sulfur compounds as sulfate ions.

The processing gas is sucked by the exhaust blower 12, supplied to the activated carbon adsorption tower 7 from the exhaust pipe 26, and flows through the activated carbon layer 8 in an upward flow. Is adsorbed and removed, and the exhaust pipe 26
The gas is discharged from the exhaust pipe 26c into the atmosphere via the line b.

Incidentally, depending on the composition of the malodorous component contained in the gas to be treated, the gas is sufficiently cleaned only in the treatment tower 1,
The processing gas is discharged to the atmosphere from the exhaust pipe 26c via the exhaust pipe 26a without being supplied to the activated carbon adsorption tower 7.

The packed layer 2 accumulates acidic components such as sulfate ions and lowers the pH to inhibit the growth of microorganisms. Therefore, it is necessary to spray water continuously or intermittently and wash and remove them. Water is supplied by the water supply pump 11 to the water supply pipe 23
And water is sprinkled almost uniformly on the upper part of the packed bed 2 by the sprinkler 6.

The watering is an operation necessary for supplying nutrients necessary for the growth of microorganisms, maintaining a suitable wet state, and removing excessively propagated microorganisms, in addition to washing the acidic components that lower the pH. .

The water used for sprinkling may be river water, groundwater, or the like. However, treated water obtained by biologically treating human waste or sewage is preferably used because it contains epiphytic microorganisms and nutrients appropriately, and It is also preferable from the viewpoint of microbial growth and maintenance of a suitable PH.

Since the efficiency of deodorization is slightly reduced during water sprinkling, it is preferable to intermittently sprinkle water. The amount of water supplied to the sprinkler 6 and the temperature raising means 3 is controlled by the control device 10 by controlling the control valves 13a and 13b. In sprinkling with the sprinkler 6, it is preferable to stop the sprinkling with the temperature raising means 3 and alternately sprinkle water in view of reduction of power cost and post-treatment of drainage. It is preferable to continuously spray water by the temperature raising means 3 at the time when the temperature decreases.

The water sprinkled and drained at the bottom of the treatment tower 1 is supplied to the drain pit 9 from a drain pipe 25, and after being stored in a certain amount, discharged from the drain pipe 25a to the outside of the system.
When watering is performed alternately with the temperature raising means 3, the properties of the drainage are different, so it is preferable to handle the water separately.

[0036]

According to the biological deodorizing apparatus of the present invention, the following effects can be obtained. In winter, when the temperature becomes extremely low, especially in cold regions, the temperature of the gas to be treated also drops to 10 ° C or less, the temperature difference between day and night becomes extremely large, the activity of microorganisms decreases, and the deodorizing effect is obtained. Therefore, it is preferable to raise the temperature of the gas to be treated. However, it has not been conventionally performed to use a fuel and separately install a heating device due to an increase in operation costs and equipment costs. In the biological deodorization device of the present invention, since the heat amount of the treated water obtained by biologically treating the sewage is used, the operation cost is low, and since it is disposed integrally in the treatment tower,
Since the installation place is not large and the facility is almost the same as a sprinkler, the facility cost is low and the operation management is easy.

[Brief description of the drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

[Explanation of symbols]

 1: treatment tower 2: packed bed 3: heating means 4: water spray pipe 5: contact material layer 6: water sprayer 7: activated carbon adsorption tower 8: activated carbon bed 9: drain pit 10: control device 11: water supply pump 12: exhaust Blowers 13a, 13b: Control valve 21: Air supply pipe 22: Water supply pipe 23: Sprinkling water supply pipe 24: Heating water supply pipe 25, 25a: Drainage pipe 26, 26a, 26b, 26c: Exhaust pipe

Claims (1)

(57) [Scope of request for utility model registration] An exhaust pipe (26) for a processing gas is connected to the top, and a gas supply pipe (21) and a drain pipe (25) for the gas to be processed are connected to the bottom, and a packed bed (2) carrying microorganisms therein. A sprinkler (6) for sprinkling water on the packed bed (2) is provided .
Of the treatment tower (1), which decomposes odorous components by ventilating in countercurrent
Biological treatment of sewage below the packed bed (2)
Raise the temperature of the gas to be treated by contacting the gas with the gas to be treated.
A heating means (3), wherein the water sprinkler (6) and the heating means
(3) supply and stop of the water supplied to the predetermined time interval
Control means (10) for controlling by means of
Biological deodorizer.