JP2901641B2 - Deodorizing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing apparatus for removing an odor component in a gas.

[Conventional technology]

Conventionally, as a deodorizing device for odor gas, absorption and removal of odor components by a liquid chemical or the like has been known. However, there is a problem that post-treatment is required for water, a chemical liquid, and the like after use.
In order to eliminate such a problem, a biological deodorizing device that comes into contact with microorganisms such as activated sludge has been developed.

[Problems to be solved by the invention]

However, in biological deodorizers that come into contact with microorganisms such as activated sludge, when exposed to acidic or alkaline odorous gas for a long period of time, the pH deviates extremely from neutral and loses activity, and the deodorizing effect decreases. Therefore, not only is it necessary to adjust the pH or replace activated sludge as appropriate, but also because the odor peculiar to activated sludge remains in the treated gas, the deodorization can be further performed after or simultaneously with the use of an adsorbent such as activated carbon. Most did.

The present invention imparts deodorizing and oxidizing power by humifying organic substances in a liquid, makes it possible to very effectively deodorize the liquid by contacting an odor gas with these liquids, and furthermore, activates sludge as the organic substance. It is an object of the present invention to provide a deodorizing apparatus capable of adding a deodorizing effect of activated sludge by using the same, and performing more powerful and effective deodorizing.

[Means for solving the problem]

In order to achieve the above object, the invention according to claim 1 provides a humification tank provided with a humification accelerator for humifying a liquid containing organic matter, and a spray tower for spraying a liquid containing humified organic matter. The liquid containing humidified organic matter that accumulates at the lower bottom of the spray tower is sent to the upper part of the spray tower and the lower part of the humification tank by a circulation pump, and the humified substance discharged from the upper part of the humification tank is discharged. Circulating the liquid containing the organic matter to the upper part of the spray tower through a gas-liquid separator, and passing the odor gas to the humification tank and the lower part of the spray tower, and the odor gas coming out of the upper part of the humification tank. Is separated by a gas-liquid separator, supplied to the lower part of the spray tower, and deodorized by bringing the odor gas into contact with a liquid containing humified organic matter in the spray tower.

The invention according to a second aspect is the invention according to the first aspect, wherein the liquid containing the organic matter is an activated sludge mixed liquid.

[Action]

In the case of the present invention, by aeration with air contained in the odorous gas, the liquid containing organic matter is humidified by the humification accelerator under aerobic conditions, and the liquid containing the humidified accelerator is sprayed with a spray tower. Deodorizes by contact with odorous gas. As described above, in the present invention, the deodorizing and oxidizing power is imparted by humifying the organic matter in the liquid, so that the pH of the liquid does not extremely deviate from neutrality and the activity is not lost, and a large deodorizing effect is obtained. Can be demonstrated.

In addition, when an activated sludge mixture solution (including concentrated activated sludge) used in sewage treatment, butt sewage treatment, general wastewater treatment, or the like is used as the liquid containing the organic matter, the activated humus that has become humus becomes humus. It has functional groups such as carboxyl group and hydroxyl group, which have strong oxidation and substitution reactions, and the deodorization by its action is reinforced by the biological deodorization ability of the activated sludge itself, and the redox potential is also kept high The deodorization is performed more effectively. Furthermore, since the odor peculiar to activated sludge disappears in the activated humus itself, the gas deodorized by the activated humus is made more odorless than the deodorized gas generated by general activated sludge.

In addition, humus activated sludge has a stronger pH buffering power than ordinary activated sludge, so even if an odor gas biased toward the acidic side or alkaline side is treated, there is almost no change in pH,
There is no need for pH adjustment, and deodorization can be performed for a long period of time.

〔Example〕

 FIG. 1 shows an embodiment of a deodorizing apparatus according to the present invention.

In the figure, reference numeral 3 denotes an odor gas to be treated, and 4 denotes a part of the odor gas 3 to be treated introduced from the lower portion of the tank, and a liquid containing organic matter stored in the tank is aerated by the introduced odor gas. While the humification tank 5 is humified by the humification accelerator 7, the humidification tank 5 gas-liquid separates the liquid containing humified organic matter and the odor gas discharged from the humification tank 4, and the liquid containing the separated humified organic matter. A gas-liquid separator, which supplies the separated odor gas into the tank from the lower part of the spray tower 6 while supplying the separated odor gas into the tank from the ceiling of the spray tower 6.
A spray tower for introducing odor gas 3 to be treated from the lower part of the tank, deodorizing the odor gas 3 by bringing the odor gas 3 into contact with a liquid containing humic organic matter, and discharging the deodorized processing gas from the upper part of the tank to the outside; 7 is a humification accelerator contained in the humification tank 4, 8 is a liquid containing humic organic matter after deodorization treatment accumulated in the lower part of the spray tower 6, flowing back to the humification tank 7, This is a circulating pump for re-supplying a part of the liquid containing humic organic matter after the deodorizing treatment from the ceiling of the spray tower 6 into the tank.

In the illustrated apparatus, the odor gas is deodorized as follows.

In the humification chamber 4, the humification accelerator 7 and the organic substance-containing liquid are brought into contact under aerobic conditions by aeration by the odor gas 3 supplied thereto to humify the organic substances in the liquid. Next, the liquid containing the humified organic matter discharged from the upper part of the humification tank 4 is separated into gas and liquid by the gas-liquid separator 5, and the separated liquid containing the humified organic matter is sent to the spray tower 6, Spray into the tank from the ceiling.

The spray tower 6 contains humic organic matter sprayed from the ceiling by a scrubber method in which the odor gas 3 to be treated and the gas separated by the gas-liquid separator 5 are drawn from the lower part of the tank and passed through the tank. After contact with the liquid to deodorize the odor of the odorous gas, the deodorized processing gas is discharged from the upper part of the tank to the outside. Then, a part of the treated liquid reaching the lower part in the tank is again circulated to the ceiling by the circulating pump 8 and sprayed, and the remaining liquid is returned to the corrosion tank 4 again and activated in the humification tank 4. And reuse. In this manner, the odor gas can be effectively deodorized for a long period of time without replacing the liquid containing an organic substance.

As the humidification promoting agent 7, humic substances mainly containing humic acid, fulvic acid, organic acid and the like, and iron powder and other iron metal compounds as reaction accelerators are spoiled to form pellets. Use what you have done. When this humidification accelerator is added to a liquid containing an organic substance at a rate of about 0.01 to 10% by weight and aerated, the organic substance in the liquid is humidified and comes to have a functional group such as a carboxyl group or a hydroxyl group. -The substitution reaction becomes stronger. Therefore, effective deodorization is performed by bringing the liquid containing the humic organic matter into contact with the odorous gas.

When the activated sludge mixed liquid used in the sewage treatment, the butt sewage treatment, the general wastewater treatment and the like is used as the liquid containing the organic matter stored in the humification tank 4, as described above, the oxidation /
The substitution reaction becomes stronger, and deodorization is performed more effectively.

(Experimental example)

An experimental example using an activated sludge mixed liquid as the organic substance-containing liquid is shown below.

7% by weight of a humification accelerator was added to 15 liters of the activated sludge mixture, and humification of the organic matter in the liquid was continued for about one month while aeration was performed to obtain a humified activated sludge which had sufficiently advanced humus. MLSS of this humidification activated sludge is 3600-4100mg / l,
The oxygen respiration rate was 0.1-1.1 mg · O ₂ / g · h.

First, the result of deodorizing the humidified activated sludge by blowing odor gas of H ₂ S into the activated humus was as shown in FIG. That is, the removal rate of H ₂ S showed an irregular removal rate for about one week after the start of the experiment, but gradually increased thereafter, and showed a removal rate of 99% or more after about two weeks.

In the case of the odor gas of NH ₃ , as shown in FIG. 3, the removal rate was 100% from the start of the experiment.

Further, the odor gas injection of the H ₂ S and NH ₃ was respectively performed.
As shown in FIG. 4, when the suspension was carried out for 16 hours, H ₂ S had a pH recovery ability of 0.2 to 0.5 and NH ₃ had a pH recovery ability of 0.2 to 0.3.

〔The invention's effect〕

As described above, according to the first aspect of the present invention, both the acidic and alkaline odor gases have a sufficient deodorizing power, and can reliably perform deodorization.
The need for pH adjustment or the like is eliminated by the pH buffering power, and efficient deodorization can be maintained for a long period of time.

According to the second aspect of the present invention, in addition to the above effects, the oxidation / substitution reaction becomes stronger, and the deodorization due to this oxidation / reduction action is reinforced by the biological deodorization ability of the activated sludge itself. The reduction potential is also kept high, and deodorization can be performed more effectively.

[Brief description of the drawings]

FIG. 1 is an apparatus configuration diagram showing one embodiment of the present invention, and FIG. 2 is H ₂ S with respect to elapsed days in an experimental example of the present invention.
FIG. 3 is a graph showing the inlet concentration and removal rate of NH _{3, and} FIG.
FIG. 4 is a graph showing the recovery status of pH with respect to the elapsed time at the time of deodorization of each of H ₂ S and NH 3. 3 ... odor gas 4 ... humification tank 5 ... gas-liquid separator 6 ... spray tower 7 ... humification accelerator 8 ... circulation pump

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) B01D 53/38 B01D 53/77

Claims (2)

(57) [Claims] 1. A humification tank provided with a humification accelerator for humifying a liquid containing organic matter, a spray tower for spraying a liquid containing humified organic matter, and a lower bottom part of the spray tower. The liquid containing the accumulated humified organic matter is sent to the upper part of the spray tower and the lower part of the humification tank by a circulation pump, and the liquid containing the humified organic matter discharged from the upper part of the humification tank is separated into a gas-liquid separator. While circulating the odor gas through the upper part of the spray tower, passing the odor gas through the humification tank and the lower part of the spray tower, separating the odor gas coming out from the upper part of the humification tank with a gas-liquid separator, and spraying. A deodorizing device, which is supplied to a lower portion of a tower and deodorizes the odorous gas by bringing the odorous gas into contact with a liquid containing humified organic matter in a spray tower. 2. The deodorizing apparatus according to claim 1, wherein the liquid containing the organic substance is an activated sludge mixed liquid.