KR100326749B1 - A removal method of the odor caused by waste gas using crushed waste tires - Google Patents

Abstract

The present invention relates to a method for removing malodorous substances contained in exhaust gas using waste tires.

(a) grinding the waste tire;

(b) filling the column with pulverized particulate waste tire such that the porosity is 35 to 45% based on the volume of the column;

(c) continuously passing the malodorous substances-containing exhaust gas to be removed to the waste tire filling column upwards to adsorb the malodorous substances and letting out the residual exhaust gas from the top of the column; (d) at the upper end of the waste tire filling column Introducing washing water and outflowing downward; And

(e) collecting the cleaning liquid that has passed through the waste tire filling column and reflowing it into the upper end of the column; There is provided a method for removing malodorous substances.

According to the above, by using the granular waste tire as the adsorbent, the cost is reduced and there is no need to go through a process for regenerating the adsorbent, and the processing efficiency and the variation over time can be improved.

Description

A method for removing odor-causing substances in exhaust gas using waste tires {A REMOVAL METHOD OF THE ODOR CAUSED BY WASTE GAS USING CRUSHED WASTE TIRES}

The present invention relates to a method for removing odor-causing substances contained in exhaust gas using waste tires, and more particularly, to effectively remove odor-causing substances contained in exhaust gas using porosity and chemical properties of granular waste tires. It is about.

Here, odor refers to the smell of irritating substances such as volatile organic compounds, amines, etc., which stimulates the sense of smell of humans, resulting in discomfort and aversion. Recently, due to the odor generated in reclaimed landfills or chemical plants, Deteriorating the working environment is causing great social problems.

These odors are caused by various kinds of chemicals. The smell that can be measured through the human sense of smell varies depending on the person and the degree of stimulation.

Therefore, researches to classify odors according to chemical composition and molecular structure of odor-causing substances have not been conducted satisfactorily, but in general, substances causing unpleasant odors include benzene, acetone, xylene, ammonia, hydrogen sulfide, Phenol, mercaptans, etc. are mentioned.

Conventional physicochemical treatment methods for controlling such odors include dilution, adsorption, combustion, catalytic oxidation, and neutralization. The dilution method refers to a method of dispersing odorous substances into the atmosphere by collecting odor-causing substances through a ventilation facility and then releasing the collected substances through a high chimney, and the adsorption method is to remove and remove odorous substances with an adsorbent such as activated carbon. Means how.

In addition, the combustion method refers to a method of removing odor-causing substances by directly burning exhaust gas with a flame at a temperature of about 600 to 800 ° C., and the catalytic oxidation method is a method of oxidizing odor-causing substances by a catalyst at a temperature of about 250 to 450 ° C. And the neutralization method means a method of controlling the odor with a strong odor.

In the case of the dilution method or the neutralization method, the treatment efficiency is low, the high energy is required for the combustion and the catalytic oxidation method, and the installation cost is expensive, while the operating conditions are not easy.

In addition, the activated carbon adsorption method is widely used because of its good removal efficiency and easy operation, but it has to be periodically desorbed due to the adsorption limit of the adsorbent itself. There is a problem that additional costs for filling are required.

Accordingly, an object of the present invention is to provide a method that can more effectively remove the odor-causing substances contained in the exhaust gas.

1 is a schematic diagram showing a reaction apparatus used to remove malodorous substances in the method of the present invention,

Figure 2 is a graph comparing the treatment efficiency of removing ammonia by the conventional activated carbon adsorption method and the method of the present invention,

Figure 3 is a graph comparing the treatment efficiency of removing acetone by the conventional activated carbon adsorption method and the method of the present invention,

Figure 4 is a graph comparing the treatment efficiency of removing phenol by the conventional activated carbon adsorption method and the method of the present invention,

5 is a graph comparing the treatment efficiency of removing xylene by the conventional activated carbon adsorption method and the method of the present invention.

6 is a graph showing the removal efficiency of ammonia treated by the method of the present invention,

7 is a graph showing the removal efficiency of acetone treated by the method of the present invention,

8 is a graph showing the removal efficiency of benzene treated by the method of the present invention,

9 is a graph showing the removal efficiency of phenol treated by the method of the present invention, and

10 is a graph showing the removal efficiency of xylene treated by the method of the present invention.

* Brief description of the main parts of the drawing *

1 ... Column 2 ... Granular Waste Tire Filling Layer

3 ... washing water inlet tube 4 ... washing water outlet tube

5.Wash solution receiver 6 ... Wash water circulation pump

According to the invention,

(a) grinding the waste tire;

(b) filling the column with pulverized particulate waste tire such that the porosity is 35 to 45% based on the volume of the column;

(c) continuously passing the malodorous substances-containing exhaust gas to be removed to the waste tire filling column upwards to adsorb the malodorous substances and letting out the residual exhaust gas from the top of the column; (d) at the upper end of the waste tire filling column Introducing washing water and outflowing downward; And (e) collecting the cleaning liquid that has passed through the waste tire filling column and reflowing it into the upper end of the column; Provided is a method for removing odor-causing substances contained in exhaust gas using waste tires.

Hereinafter, the present invention will be described with reference to the drawings.

The present inventors have found that the use of granular waste tires and washing water as adsorbents can stably reduce odor-causing substances and consequently improve treatment efficiency.

In the present invention, waste tires are first ground. At this time, the diameter of the waste tire is not necessarily limited to this, but if it exceeds 2mm, it is difficult to pass the exhaust gas during the reaction and if the flow rate is strong during the reaction process, the waste tire powder may flow out of the column so that it is 2 mm or less. It is more preferable to grind.

After the pulverization as described above, the granular waste tires are washed with water to separate the fine pulverized powder produced during the crushing process from the granular waste tires and then sufficiently dried at about 105 ° C.

Then, the dried granular waste tire is filled in the column so that the porosity is about 35 to 45%. For example, when the diameter of the pulverized waste tire is 2 mm, about 0.5 g of granular waste tire per column 1 cm ³ may be used to obtain a porosity within the above range. At this time, if the porosity is less than 35%, the pressure is too high to allow the exhaust gas to pass properly, and if it exceeds 45%, the passage rate of the exhaust gas is improved, but it is not preferable because proper contact with the waste tire does not occur.

Thus, the odor-causing substance-containing exhaust gas to be treated is passed upward through a column packed with waste tires. At this time, the temperature of the introduced flue gas is preferably 100 ° C. or less, and the space volume residence time is not particularly limited as long as sufficient contact between the waste tire and the malodor-containing flue gas can be ensured, but usually about 10 seconds is sufficient. The temperature of the flue gas to be treated is different depending on the reaction process, but is generally discharged at a high temperature of 400 ℃ or more, it can be used to recover the heat generated by reducing the temperature to about 100 ℃.

In addition, the exhaust gas can be treated either batchwise or continuously, but from a practical point of view, it is more preferable to continuously treat the exhaust gas.

In this way, when the odor-causing substance-containing exhaust gas is passed, the reaction mechanism passes through the pores formed from the crushed waste tires, and the organic components of the waste tire and the organic odor-causing substances are adsorbed to each other, resulting in odor on the waste tire. The trigger is believed to be adsorbed and absorbed.

After the malodorous substances are adsorbed, the remaining exhaust gas is completely treated by flowing through the exhaust gas outlet pipe 4 at the top of the column.

In addition, when the washing water flows in through the upper end of the column of the waste tire filling column 1 and flows downward to cross the washing water and the exhaust gas, the adsorption capacity of the washing water works together with the adsorption capacity of the waste tire as described above. It is thus more preferable to remove the malodorous substances.

Even in this case, in order to introduce the cleaning liquid, a conventional apparatus such as a nozzle capable of injecting the cleaning liquid is mounted on the upper end of the column, and the cleaning liquid flowing down to the lower end of the column is collected so that the cleaning liquid flows out from the upper end of the column together with the exhaust gas, To prevent loss.

When the washing water is introduced in this way, it is preferable to operate by adjusting the exhaust gas inflow load to be about 570 times the washing water inflow load, that is, maintaining the inlet load of the exhaust gas to be 57cc / cm 2 · min or less. The inflow load of is preferably adjusted to be 0.1 cc / cm 2 · min or less.

Outside the above range, the washing water is hindered to downward, and the washing water is discharged to the upper end of the exhaust gas outflow passage, which may result in the loss of odor-causing substances to be treated, and requires a separate device to recover the outflow water. Not desirable

The cleaning liquid having passed through the waste tire filling column is collected in the cleaning liquid container 5 mounted at the lower end of the column and then re-introduced into the upper end of the column by a circulation pump 6 to continuously circulate the cleaning liquid inside the column to be adsorbed into the pores of the waste tire. The waste tires are used as an adsorbent as much as possible by transferring odor causing substances into the cleaning liquid.

In addition, the cleaning solution should be replaced periodically, it is preferable to replace the odor of the exhaust gas after the process of the present invention is more than 2 degrees according to the direct sensory method, and the waste tires are recovered together.

The waste tires recovered as described above are inexpensive because the waste tires themselves are inexpensive. Instead, the waste tires are recycled as fuel, and new waste tires are used as adsorbents.

Hereinafter, the present invention will be described in more detail with reference to Examples. The following examples are merely to illustrate the invention, but are not limited thereto.

<Example>

Examples 1-4: Comparison of the effect of removing odor-causing substances from the activated carbon adsorption method in the case of using only granular waste tire

Since the adsorption method using activated carbon adsorbent in the conventional odor reduction method is not only high processing efficiency but also easy to operate, the present invention intends to prepare for the efficiency of removing the malodor-causing substances using activated carbon as a comparative example.

Example 1 Comparison of Ammonia Removal Efficiency When Using Granular Waste Tire and Activated Carbon

Ammonia-containing flue gas was introduced into an acrylic circular column having a diameter of 3 cm and a height of 13 cm at a temperature of 20 ° C. and a speed of 400 cc / min using an air pump. The space volume residence time was 13.7 seconds.

Then, the granular waste tires crushed to 2 mm in the column were filled with glass beads having a diameter of 5 mm and 12.31 g of the granular waste tires (porosity 40%) and the same amount of activated carbon as the amount of the granular waste tires used as the adsorbent, respectively. The ammonia emission in the effluent was measured.

Example 2: Acetone removal efficiency compared with granular waste tire and activated carbon

Exhaust gas containing acetone was introduced, and the same experiment as in Example 1 was repeated except that 11.64 g of granular waste tire was filled, and the treatment efficiency of acetone was measured.

Example 3 Comparison of Removal Efficiency of Phenol with Granular Waste Tire and Activated Carbon

Exhaust gas containing phenol was introduced, and the same experiment as in Example 2 was repeated except that 15.14 g of granular waste tire was filled, and the treatment efficiency of phenol was measured.

Example 4 Comparison of Removal Efficiency of Xylene with Granular Waste Tire and Activated Carbon

Exhaust gas containing xylene was introduced and the same experiment and measurement experiment as in Example 2 were repeated except that 16.22 g of granular waste tire was filled.

At this time, the removal efficiency was calculated as the amount of odor-causing substances per kg of adsorbent (g / kg) and the results are shown in FIGS. 2 to 5.

In addition, when the activated carbon and granular waste tires are used from the respective figures, the treatment efficiencies for the malodor-causing substances are summarized in Table 1 below.

ammonia Acetone phenol xylene Waste Tire (g / kg) 0.65 17 0.85 15 Activated carbon (g / kg) 0.2 2.5 0.25 5 Observation time (minutes) 300 70 250 160

As shown in the table, it can be seen that the odor removal method using the waste tire shown in the present invention exhibits much better efficiency than the activated carbon adsorption method, which was a relatively good method for removing odor-causing substances in the past. In addition, there is no need to periodically detach and regenerate.

Examples 5-9: Comparison of removal effect of odor-causing substances when only granular waste tires are used as adsorbents and when washing water is used together with granular waste tires

Example 5 Treatment Efficiency of Ammonia-Containing Flue Gas

Ammonia-containing flue gas was introduced into an acrylic circular column having a diameter of 3 cm and a height of 13 cm at a temperature of 20 ° C. and a speed of 400 cc / min using an air pump. The space volume residence time was 13.7 seconds.

Then, if both the granular waste tire and the washing water were not used in the column, 12.31 g of the granular waste tire and 5 mm diameter glass beads were filled, and 12.31 g of the granular waste tire were filled and the washing water was added and this was done 28 times. Ammonia emissions in the effluent were measured for each case treated with circulating degree. At this time, the inlet load of the exhaust gas was 57 cc / cm 2 · min and the inlet load of the washing water was 0.1 cc / cm 2 · min.

Referring to FIG. 6 showing the result, when the granular waste tire was filled in the column only after 300 minutes, the ammonia removal rate was 57% based on the case where neither the granular waste tire nor the washing water was used. If the tire is used and the cleaning solution is circulated, the ammonia removal rate is improved to 85.7%.

Example 6 Treatment Efficiency of Flue Gas Containing Acetone

Except for introducing acetone-containing flue gas, filling 11.64 g of granular waste tire, and circulating the washing solution seven times, the same three experiments as in Example 5 were repeated and the treatment efficiency of acetone was measured.

As shown in FIG. 7, the treatment efficiency was 80%, and the removal efficiency was lowered after 80 minutes while maintaining the removal capacity for about 70 minutes.

Example 7 Treatment Efficiency of Flue Gas Containing Benzene

Exhaust gas containing benzene was introduced, and the same three experiments as in Example 5 were repeated except that 12 g of granular waste tires were filled and the cleaning solution was circulated about 18 times, and the treatment efficiency of benzene was measured.

As shown in FIG. 8, the treatment efficiency was 75%, and in the case of benzene, similar to the acetone removal experiment (Example 2), the removal ability was maintained for about 80 minutes, and then the removal ability was lowered thereafter.

Example 8 Treatment Efficiency of Flue-Containing Flue Gas

Exhaust gas containing phenol was introduced, 15.14 g of granular waste tire was filled, and the same experiment as in Example 5 was repeated except that the washing solution was circulated about 24 times to measure the treatment efficiency of phenol.

In the case of phenol, almost no phenol was measured in the flue gas outlet for a total of 240 minutes during the experiment as shown in FIG. 9. That is, the removal efficiency was 99% or more during the experiment observation.

Example 9 Treatment Efficiency of Flue Gas Containing Xylene

Exhaust gas containing xylene was introduced, 16.22 g of granular waste tire was filled, and the same experiment and measurement experiment as in Example 5 were repeated except that the cleaning solution was circulated about 16 times. While the concentration is 150 mg / l, the xylene concentration discharged after treatment for about 160 minutes is only 25 mg / l and the removal efficiency reaches 83%.

According to the above, by using the granular waste tire as an adsorbent, the removal efficiency of the malodor-causing substance can be improved and, as a result, the treatment time can be shortened, and no separate desorption and regeneration process is required.

Claims (5)

Grinding the waste tire; Filling the column with pulverized granular waste tire such that the porosity is 35 to 45% based on the volume of the column; Continuously passing upwards the malodorous substance-containing exhaust gas to be removed to the waste tire filling column to adsorb the malodorous substances and draining the residual exhaust gas from the top of the column; Injecting the washing water to the upper end of the waste tire filling column to flow downward; And Collecting the washing liquid passing through the waste tire filling column and reflowing it into the upper end of the column; Removal method of odor-causing substances contained in exhaust gas using waste tire The method of claim 1, wherein the malodor causing substances to be removed include benzene, acetone, xylene, ammonia and phenol. The method of claim 1, wherein the granular waste tires are ground to have a diameter of 2 mm or less. delete The method according to claim 2, wherein the exhaust gas inflow load is maintained to be 57 cc / cm 2 · min or less, and the inflow load of the washing water is adjusted to be 0.1 cc / cm 2 · min or less.