KR100470351B1 - Bioceramic Media and It's Production Method for Wastewater Treatment - Google Patents

Abstract

The present invention relates to a wastewater treatment carrier and a manufacturing method thereof, and more particularly, to a zeolite having an ion exchange and adsorption capacity of ammonia nitrogen in a biological nitrification and denitrification process, and a suitable mineral material capable of improving the nitrogen removal efficiency. The present invention relates to a carrier obtained by mixing and calcining the same, and a method for preparing the same, and a method for treating wastewater by using the carrier, wherein in the formulation of the carrier, 60 to 70% by weight of zeolite and 30 to 40% by weight of auxiliary compound material are used. After mixing in the mixing ratio of 1 ~ 1.5 ㎝ diameter spherical shape, which was dried for 3 to 7 days, and then fired at 600 ~ 850 ℃ fire furnace for 3 to 7 hours in each firing furnace (10) (10 '), reduced to It is characterized by firing each for 1 to 4 hours.

Description

Oh, wastewater treatment carrier and manufacturing method {Bioceramic Media and It's Production Method for Wastewater Treatment}

The present invention relates to a wastewater treatment carrier and a manufacturing method thereof, Is a carrier obtained by mixing and calcining a zeolite having ion exchange and adsorption performance of ammonia nitrogen and an appropriate mineral which can improve nitrogen removal efficiency in a biological nitrification and denitrification process, and a method for producing the same. It is about how to process.

In general, the biological treatment method of wastewater is subjected to a step of oxidizing ammonia nitrogen to nitrate nitrogen by nitrifying microorganisms under aerobic conditions, and then reducing and removing the oxidized form of nitrogen using an organic substance as an electron donor under anoxic conditions. Consists of the way it is treated.

In such a method, as a method for improving the treatment efficiency, a method of circulating and processing powder zeolite directly into an aerobic reactor, and a separate zeolite packed column is installed in a subsequent process to adsorb and remove ammonia nitrogen. Method and the like.

However, since the general biological treatment method is focused on treating organic matter, there is a problem that removal and treatment of ammonia nitrogen are not efficient, and the zeolite is directly added to and treated in powder form, thereby maintaining the zeolite There are problems such as economic loss as well as an increase in the amount of waste sludge generated, as well as a cost of regeneration chemicals due to the regeneration of the zeolite filling tower.

In addition, there is a treatment method using a biofilm such as a ciliated carrier, but in this case, the concentration of organic matter by the microorganism is concentrated, and it is difficult to expect ammonia nitrogen removal efficiency. In addition, although a process of inducing nitrogen removal by attaching and immobilizing nitric oxide or by immobilizing it comprehensively may be considered, it is difficult to efficiently cope with difficulties in processing operation and impact response to high inflow of ammonia nitrogen.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a carrier for improving nitrogen removal efficiency through ion exchange and biological regeneration of ammonia nitrogen at the same time as decomposition of high concentration organic materials. And a method for producing this carrier.

Another object of the present invention is to provide a method capable of efficiently treating ammonia nitrogen while simultaneously decomposing and treating wastewater under high concentration using the carrier.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, Figure 1 is a block diagram of a carrier manufacturing process for wastewater treatment of the present invention, Figure 2 is a state in which the carrier of the present invention is applied to the wastewater treatment reactor 3 is a schematic block diagram of a wastewater treatment process according to FIG. 2.

As shown in the figure, in the blending ratio of 60 to 70% by weight of the zeolite and 30 to 40% by weight of the auxiliary blending material in the raw material of the carrier, the auxiliary blending material is 40-50% of kaolin (kaolin), limestone 5 ~ 10%, pottery 5-10%, silica 2-5%, clay 5-10%, dolomite 5-10%, jade 5-10%, carbon 2-5%, titanium dioxide 3% It is molded into a sphere with a diameter of 1 ~ 1.5㎝.

After drying for 3 to 7 days, it is reduced to 600 ~ 850 ℃ of fire oxide (fire which is completely burned by supplying sufficient oxygen when the carrier is fired) in each firing furnace (10) (10 '). The porous carrier 11 was fired for 1 to 4 hours each with fire (fire that burns in a restricted state of oxygen supply when the carrier is fired and creates an atmosphere that takes away the appeal associated with the carrier, thereby reducing the carrier). Get

The chemical composition of this carrier 11 is shown in Table 1.

Table 1.Component Composition of Bioceramic Carriers

ingredient SiO ₂ Al ₂ O ₃ CaO K ₂ O Na ₂ O Fe ₂ O ₃ Other C percentage(%) 64.3% 16.5% 3.28% 1.8% 2.61% 3.57% 7.94%

2 shows a filling tower used for immersing in the waste water by filling the carrier 11, wherein the filling part 20, the space part 22, and the air injection port 21 of the carrier 11 are directly below. It consists of.

Referring to the present invention configured as described above in detail as follows.

The carrier 11 made of bioceramic has ion exchange performance with respect to NH ₄ ⁺ ions based on silicon oxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ) as shown in Table 1 as a main component. Therefore, it is possible to act as a buffer against the impact load of ammonia nitrogen during the initial inflow of wastewater, and biological regeneration occurs by desorbing ammonia nitrogen on the carrier as nitrification proceeds.

This mechanism is shown in Figure 1, where the ion-exchange capacity per unit weight of the carrier is determined by the acid site of the silicon oxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ) unit grids. Depends on the ratio.

Figure 1. Adsorption and Regeneration Process of Ions

Ion Exchange Steps:

Bioceramic-Na + NH ₄ ⁺ ↔ Bioceramic-NH ₄ + Na ⁺

Biological regeneration stages:

Bioceramic-NH ₄ + Na ⁺ ↔ Bioceramic-Na + NH ₄ ⁺

^{_{NH 4 + + 2O 2 → NO}} 3 - + 2H + + H 2 O

Figure 2 shows the inhibition of nitrification by ion exchange according to the ammonia nitrogen concentration in the wastewater and wastewater influent.

In general, nitrification is a process in which NH ₄ ⁺ -N passes through NO ₂ ^-- N to NO ₃ ^-- N, and denitrification is a process in which NO ₃ ^-- N becomes nitrogen gas (N ₂ ) under anoxic conditions. . In this nitrogen removal process, the unionized NH ₄ ⁺ -N and NO ₂ ^-- N are toxic to the nitrification reaction. The free ammonia is less than 0.1mg / L and the free nitrous acid ) Is known to be able to completely nitrify only below 0.2mg / L.

Therefore, when a high concentration of ammonia nitrogen is introduced, the bioceramic carrier is moved from the A region (large nitrification) to the B region (small nitrification). In addition, even when a low concentration of ammonia nitrogen is introduced, it is possible to switch from the C region to the D region to mitigate nitrification.

Figure 2.

In general, since the concentration of ammonia nitrogen in sewage is about 15 to 40 ppm, the ion exchange capacity of ammonia nitrogen in bio ceramics to low concentration of ammonia nitrogen is about 60 to 80%. Inhibition can be reduced. In case of livestock wastewater, the concentration of ammonia nitrogen is 2000 ~ 4000ppm, which shows 40 ~ 60% of ammonia ion exchange capacity by bioceramic carrier. It can be applied to biological nitrogen removal process by suppressing nitrification inhibition by high concentration ammonia nitrogen.

Table 3 shows an example in which the nitrogen removal efficiency is improved in the livestock wastewater by the ion exchange capacity of ammonia nitrogen by the bioceramic carrier, and it can be seen that the TN removal efficiency is excellent when the bioceramic carrier 11 is applied. .

Table 3. Performance Comparison of Carriers in Batch Reactors

Inflow (mg / L) Treated water concentration (mg / L) Removal rate (%) Bio ceramic carrier not added Bio ceramic carrier input Bio ceramic carrier not added Bio ceramic carrier input BOD 2840 296 129 89.5 95.4 TN 1865 516 278 72.4 85.1

Tables 4 and 5 show laboratory results for determining the blending ratio and firing temperature of the bioceramic carrier, and Table 4 shows the results of experiments by changing the blending ratio of zeolite and auxiliary blend material.

As a result of the experiment, as the ratio of zeolite increases, the ammonia ion exchange rate tends to increase, and the mixing ratio is limited to 7: 3. The ion exchange rate of ammonia nitrogen according to the firing temperature is ammonia when the firing temperature is 900 to 1000 ° C. Although the ion exchange rate of soluble nitrogen was low as 26.2, when the calcination temperature was lowered to 600 to 850 ° C, the adsorption rate of ammonia nitrogen was about 2.5 times higher, so it was appropriate to set the calcination temperature to 600 to 850 ° C. .

Table 4. Performance Comparison of Raw Material Composition of Bioceramic Carrier

Mixing ratio of bioceramic materials (wt%) Firing temperature (℃) Adsorption rate (%) Zeolite Auxiliary compound 7 3 900-1000 35.7 6 4 900-1000 31.4 5 5 900-1000 30.6

Table 5. Performance Comparison of Firing Temperatures of Bioceramic Carriers

Mixing ratio of bioceramic materials (wt%) Firing temperature (℃) Ammonia nitrogen adsorption rate (%) Zeolite Auxiliary compound 7 3 1000-1100 26.2 7 3 900-1000 35.7 7 3 600 to 850 63

As described above, the present invention provides a bioceramic carrier, and by using the same, there is an effect of efficiently removing nitrogen through ion exchange and biological regeneration of high concentration ammonia nitrogen, and renovating and repairing an existing treatment process. Without, there is an immediate effect.

1 is a block diagram of a carrier manufacturing process for wastewater treatment of the present invention.

2 is a schematic view showing a state in which the carrier of the present invention is applied to a wastewater treatment reactor.

3 is a process block diagram for a wastewater treatment process according to FIG. 2.

※ Explanation of codes for main parts of drawing

10, 10 ': kiln 11: carrier

20: filling part 21: air injection port

22: space part

Claims (3)

In the wastewater treatment carrier, In the blending ratio of 60 to 70% by weight of zeolite and 30 to 40% by weight of the auxiliary compounding material, the auxiliary compounding material is 40 to 50% of kaolin (kaolin), 5 to 10% of limestone, and 5 ~ 10%, 2-5% silica, 5-10% clay, 5-10% dolomite, 5-10% jade, 2-5% carbon, 3% titanium dioxide It is shaped into a spherical shape, and then it is naturally dried for 3 to 7 days, and then calcined for 3 to 7 hours with fire oxide at 600 to 850 ° C. and 1 to 4 hours with reduced light in each firing furnace 10 (10 '). Oh, carrier for wastewater treatment. delete In the manufacturing method of the carrier for wastewater treatment, In the blending ratio of 60 to 70% by weight of zeolite and 30 to 40% by weight of auxiliary compound material, 40 to 50% of the above auxiliary compound material kaolin (kaolin), 5 to 10% limestone, 5 to 10% stone, 2 to 5 silica %, Clay 5 ~ 10%, dolomite 5 ~ 10%, jade 5 ~ 10%, carbon 2 ~ 5%, titanium dioxide 3% After naturally drying for 3 to 7 days, each of the firing furnace (10) (10 ') to be fired for 3 to 7 hours with a fire oxide of 600 ~ 850 ℃, respectively for 1 to 4 hours with reduced light to produce a porous carrier 11 Method for producing a wastewater treatment carrier characterized in that.