KR200218157Y1 - Adsorbent manufacturing device using the municipal solid waste incinerator ash - Google Patents

Abstract

The present invention relates to an adsorbent production apparatus using fly ash for recycling the fly ash discharged from the dust collector of the municipal waste incineration plant to the adsorbent for waste water treatment.

The adsorbent manufacturing apparatus of the present invention has a different configuration depending on the pH of the fly ash. If the fly ash has a pH of 8 or more, fly ash storage tank, fly ash supply device, reaction device, fly ash discharge port, exhaust gas discharge pipe, wet cleaner, etc. If the pH of fly ash is less than 8, the limestone storage tank is added.

The adsorbent manufacturing apparatus using fly ash of the present invention can extend the landfill use life by recycling fly ash which was previously buried, and has a comparative advantage in terms of manufacturing cost in comparison with the existing adsorbent in terms of manufacturing cost. Adsorbent manufacturing apparatus has the advantage of greatly reducing the initial installation cost and operating cost because the equipment is simple and operates at low temperatures.

Description

Adsorbent manufacturing device using the municipal solid waste incinerator ash}

The present invention relates to an apparatus for producing municipal waste fly ash disposed of in a designated waste landfill as an adsorbent. More particularly, the present invention relates to an apparatus for producing an adsorbent for wastewater treatment by treating the fly ash in a reaction apparatus and stabilizing heavy metals contained in the fly ash.

Fly ash emitted during incineration of municipal waste contains high concentrations of harmful heavy metals, of which cadmium or lead elution exceeds the legal limit and is entrusted to designated waste landfills. Fly ash can be recycled because of its large specific surface area and uniform particles. However, since the dissolution concentration of harmful heavy metals contained in fly ash is high, stabilization treatment is required to prevent heavy metals from being eluted for recycling.

Conventional techniques for stabilizing heavy metals in fly ash are made mainly in countries with high municipal waste incineration rates, such as Japan, and treatment methods include melt solidification, cement solidification, acid extraction, and chemical addition. Except for the melt solidification method, chemicals are used to stabilize heavy metals in fly ash, which can lead to secondary environmental pollution due to re-dissolution of heavy metals during recycling. On the other hand, in the melt solidification method, the fly ash is heated to 1200-1500 ° C. to make the heavy metal into solid solution in the mesh of the molten slag, thereby stabilizing the treated fly ash as a construction material. Therefore, the melt solidification method is excellent in terms of stabilization and reuse of fly ash, but it does not solve the problem of high initial installation cost and operation cost because the processing system is complicated and high temperature must be maintained.

As described above, there are many technologies for stabilizing urban waste fly ash, but most of them have been developed for stabilization of incineration ash, and a technology for stabilizing incineration ash at low cost and recycling stabilized ash is needed. Do.

The present invention was created to solve the conventional problems, and to provide an adsorbent manufacturing apparatus for stabilizing fly ash at low cost, and to recycle the stabilized fly ash to the adsorbent.

1 is a block diagram of an adsorbent manufacturing apparatus using fly ash having a pH of 8 or more of the present invention

2 is a block diagram of an adsorbent production apparatus using fly ash less than pH 8 of the present invention

<Description of the symbols for the main parts of the drawings>

1. Dust collector 2. Fly ash storage tank

3. Fly ash supply unit 4. Reactor

5. Fly ash discharge outlet 6. Exhaust gas discharge pipe

7. Wet cleaner 8. Blower

9. Slaked lime storage tank

The present invention relates to a device for stabilizing heavy metals by heat treatment of fly ash discharged from the dust collection device of municipal waste incinerator under low temperature reducing conditions, and to manufacture an adsorbent using the fly ash of the present invention with reference to the accompanying drawings. It will be described in detail.

1 is a view showing the configuration of an adsorbent production apparatus using fly ash having a pH of 8 or more. The fly ash discharged from the dust collector is stored in the fly ash storage tank and introduced into the reactor by the fly ash feeder. The reactor 안정화 serves to stabilize the heavy metals contained in the fly ash so as not to be eluted, and the operating conditions in the reactor 8 are pH 8 or higher of JP 2000-0018258 (2000. 04. 06) It is provided to maintain the reaction temperature of 500 to 600 ℃ and the residence time of 1 to 2 hours, the heat treatment conditions of the incineration ash. Fly ash introduced into the reactor apparatus is left for 1 to 2 hours in a reducing condition of 500 to 600 ℃ and then discharged through the fly ash outlet ⑸ is air cooled. The gaseous pollutants generated during the stabilization of fly ash in the reactor are removed from the wet cleaner via the exhaust gas discharge pipe. The blower in the rear stage of the wet cleaner acts as a means of discharging air from the gaseous pollutants and fly ash outlets from the reactor through the exhaust gas outlet and the wet cleaner. That is, as the blower 작동 operates, the gaseous pollutants generated in the reactor ⑷ are not discharged through the fly ash outlet 에서 without being treated, but with the air flowing from the fly ash outlet ⑺ together with the exhaust gas outlet ⑹ and the wet cleaner ⑺. 2 is a diagram showing the configuration of an adsorbent production apparatus using fly ash having a pH of less than 8. Figure 2 is characterized in that the slaked lime storage tank is added compared to FIG. This is in accordance with the method for stabilizing the incineration ash having a pH of less than 8 of the Patent Application Publication No. 2000-0018258 (2000. 04. 06) filed by the present inventor. According to the Patent Publication, the incineration material having a pH of less than 8 is stabilized by heat treatment after the addition of the slaked lime 3 to 5% by weight relative to the incineration ash. Therefore, the fly ash having a pH of less than 8 even in the manufacture of fly ash as an adsorbent, when the fly ash discharged from the dust collector 저장 is stored in the fly ash storage tank, the slaked lime of the slaked lime storage tank is 3 to 5% by weight relative to the fly ash. Add to fly ash storage tank. Fly ash added with slaked lime is introduced into the reactor by a fly ash feeder, stays for 1 to 2 hours at a reducing condition of 500 to 600 ° C, is discharged through the fly ash discharge port, and is produced as an adsorbent through an air cooling process. .

<Example 1>

The fly ash produced by the adsorbent manufacturing apparatus of the present invention was used as an adsorbent to remove the COD and T-P contained in the wastewater treatment plant, the results are shown in Table 1. As the amount of fly ash increased, the removal rate of COD and T-P increased, especially the removal rate of T-P was higher than that of COD, which is due to the removal of iron and aluminum contained in fly ash by reacting with phosphorus to form a precipitate.

Removal rate of COD and T-P using adsorbent of the present invention (%) High liquid ratio Concentration in waste water (ppm) 1: 100 1: 500 1: 1000 COD 53.8 29 22 7 T-P 50.0 Over 99 43 18

<Example 2>

The result of using the fly ash produced by the adsorbent manufacturing apparatus of the present invention as an adsorbent for treating wastewater containing heavy metals is shown in Table 2.

Maximum adsorption amount of heavy metal according to the high liquid ratio (unit: g / kg) absorbent High liquid ratio Heavy Metal Concentration in Wastewater (ppm) 1: 100 1: 300 1: 500 1: 700 1: 900 Fly ash Copper Lead Zinc Nickel 103.096.455.566.2 10.39.15.26.6 30.928.67.619.3 51.548.19.831.8 72.067.511.343.4 74.386.814.255.4 Activated carbon Copper Lead Zinc Nickel 103.096.455.566.2 10.29.61.76.3 22.328.93.318.4 31.547.95.230.5 39.264.47.342.7 48.178.79.154.9

The present invention is a technology for stabilizing the heavy metal contained in the municipal waste fly ash to recycle to the adsorbent, has the following advantages.

(2) It is possible to extend the service life of the landfill by recycling the fly ash compared to the conventional treatment methods that were entrusted to the designated landfill. (B) By manufacturing fly ash that is disposed of as an adsorbent, it has an economic comparative advantage in terms of manufacturing cost of the adsorbent. 안정화 The stabilization of fly ash and recycling to adsorbent can be done at the same time, so it is possible to maximize fly ash treatment and effective use of resources. ⑷ The adsorbent manufacturing device can greatly reduce the initial installation cost and operation cost because the device is simple and operates at low temperature.

Claims (1)

A fly ash storage tank for storing fly ash discharged from the dust collector⑴, a fly ash supply device for supplying fly ash of the fly ash storage tank to the reaction device⑷ by a certain amount, a reactor for stabilizing fly ash, and a stabilized fly ash Fugitive outlets from which gas is discharged, exhaust gas outlets, which are exhaust paths of air flowing from gaseous pollutants and fly ash outlets, wet cleaners for treating gaseous pollutants, and exhaust gases in reactors. And a blower ⑻, which is a means for discharging the air introduced from the fly ash discharge port 로 to the atmosphere through the exhaust gas discharge port ⑹ and the wet cleaner ⑺.