KR200418368Y1 - Apparatus for Iodine wastewater treatment by activated sludge - Google Patents

Abstract

The present invention relates to a biological treatment apparatus for iodine wastewater, the purpose of which is to enable simple and economical treatment of wastewater generated in various fields, such as semiconductor using iodine as a raw material.

The present invention provides a treatment apparatus for treating wastewater containing iodine by using an activated sludge method, comprising: a line mixer in which pH adjustment and a reduction reaction of the supplied wastewater occur; A flow rate adjustment tank for uniformly adjusting the concentration of iodine waste water supplied from the line mixer through the transfer pipe; An aeration tank in which microbial treatment of iodine wastewater supplied from the flow rate adjustment tank through a transfer pipe occurs; A settling tank for solid-liquid separation of the microbial sludge supplied through the transfer pipe from the aeration tank; It is characterized by consisting of a dehydrator for dewatering the excess sludge supplied through the transfer pipe from the sedimentation tank treated with sludge cake.

Iodine Wastewater Treatment, Reduction Treatment, Surplus Activated Sludge, Semiconductor, Biological Treatment

Description

Apparatus for Iodine wastewater treatment by activated sludge}

1 is an embodiment showing an iodine wastewater treatment process and apparatus configuration according to an embodiment of the present invention,

Figure 2 is an embodiment showing the configuration of the iodine wastewater treatment process and apparatus according to another embodiment of the present invention,

Figure 3 is an embodiment showing the configuration of the iodine wastewater treatment process and apparatus according to another embodiment of the present invention.

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

(1): Line Mixer (2): Flow Adjustment Tank

(3): pressurized flotation tank (4): activated carbon filter

(5): aeration tank (6): sedimentation tank

The present invention relates to a biological treatment apparatus for iodine wastewater, and in detail, by reducing iodine in the wastewater containing iodine to iodine ions to minimize the effects on microorganisms, the treatment of wastewater by applying biological treatment process even in high concentration iodine wastewater It's about making it possible.

In general, the most widely used iodine wastewater treatment method is an organic anion exchange resin, which removes iodine compounds present in the form of iodine ions or iodide ions using organic anion exchange resins.

However, waste water is iodine iodide ion (I ^-) is low, iodate ion (IO ^3-), iodine (I ₂₎ is because the presence of a mixture of iodine (I ₂₎ upon treatment with an anion exchange resin, when present as a removal efficiency There is a problem that causes a problem in the subsequent processing by the oxidizing strong iodine.

Another method is to use activated carbon, but it is possible to remove iodine, but if it contains high concentration of iodine, it is inexpensive due to excessive cost of activated carbon replacement, and it is impossible to remove iodine or iodine ion. It is used as a pretreatment process for anion exchange resin.

Recently, as iodine treatment, iodine is reduced to iodine ions, and mercury sulfate or silver chloride is added to precipitate and removed by HgI or AgI. However, the iodine treatment is difficult in terms of hazard and economic efficiency. In particular, if the amount of wastewater generated or high concentration is practically impossible.

The purpose of the present invention for solving the above problems is to reduce the iodine in the wastewater in which iodine is present in high concentrations generated in various fields such as semiconductors using iodine as a raw material through pre-treatment process to harm the oxidizing power of iodine to iodine ion The present invention provides a biological treatment apparatus for iodine wastewater, which can be treated without biological effects by causing biological treatment.

The present invention to achieve the object as described above and to perform the problem for eliminating the conventional defects in the treatment apparatus for treating wastewater containing iodine using activated sludge method, pH adjustment and reduction reaction of the supplied wastewater This happens with a line mixer; A flow rate adjustment tank for uniformly adjusting the concentration of iodine waste water supplied from the line mixer through the transfer pipe; An aeration tank in which microbial treatment of iodine wastewater supplied from the flow rate adjustment tank through a transfer pipe occurs; A settling tank for solid-liquid separation of the microbial sludge supplied through the transfer pipe from the aeration tank; It is characterized by consisting of a dehydrator for dewatering the excess sludge supplied through the transfer pipe from the sedimentation tank treated with sludge cake.

In addition, the flow rate adjustment tank is characterized in that it further comprises a pressurized flotation tank for removing the floating material of the iodine waste water supplied through the transfer pipe.

In addition, it characterized in that it further comprises an activated carbon filter for neutralizing the oxidative power of the iodine waste water supplied through the feed pipe after the pressurization.

Looking at the method of treating the wastewater containing iodine using the activated sludge method with the device configuration of the present invention as described above, the incoming wastewater is adjusted to the pH in the line mixer and the reducing agent at the rear of the line mixer in the pH adjusted state A reduction treatment by adding; Storing the reduced iodine waste water in a flow rate adjusting tank; And then processing the organic material by the microorganisms by entering the aeration tank; After the solid-liquid separation in the settling tank; Thereafter, the iodine wastewater is treated, including the final treatment of the solid-liquid separated microbial treated water to meet the discharged water quality standards.

In addition, after the step of storing in the flow rate adjustment tank may further include the step of removing the suspended solids through the pressure flotation tank to remove the suspended solids in the reduced iodine waste water.

The method may further include removing residual oxidative power of the iodine waste water by passing the stored and reduced treated iodine waste water through an activated carbon filter after removing the floating material.

The pH is adjusted to 8.0 to 8.5, but the reason for adjusting the pH is lower than the lower limit, so that the reduction of hydrogen peroxide used for the reduction of iodine is unstable, resulting in the oxidation reaction of iodine by oxygen in the subsequent aeration tank. There is a problem of killing microorganisms, and if the upper limit is higher than the upper limit, the pH is acting as an inhibitor, so the biological treatment efficiency is lowered, so the range is appropriate.

Hydrogen peroxide is used as the reducing agent, but the concentration is 30%, and the dosage is 0.05-1 ppm.

The reason for using hydrogen peroxide is hydrogen peroxide because it is economical because the reduction reaction can occur even with a small amount of injection and is decomposed into harmless water and oxygen after the reduction reaction. Sodium thiosulfate as the other reducing agent is difficult to apply because the excess reducing agent should be added.

The reason for limiting the concentration is that it is the concentration used in the experiment in order to facilitate the conversion of the amount injected to the concentration.

The reason for limiting the input amount is that a reduction reaction occurs later than the lower limit and a problem occurs in the subsequent treatment by unreacted iodine, and when the upper limit is exceeded, problems such as a decrease in treatment efficiency in a biological treatment process, which is a subsequent treatment process by residual hydrogen peroxide. Because of this.

Hereinafter, the configuration and the operation of the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows an embodiment showing the configuration of the iodine wastewater treatment process and apparatus according to the present invention, as shown in the configuration is a line mixer (1) that the pH adjustment and reduction reaction of the supplied wastewater occurs; A flow rate adjustment tank (2) for uniformly adjusting the concentration of iodine waste water supplied from the line mixer through the transfer pipe; An aeration tank 5 in which microorganism treatment of iodine waste water supplied from the flow rate adjustment tank 2 through the transfer pipe occurs; A settling tank (6) for solid-liquid separation of the microbial sludge supplied through the transfer pipe from the aeration tank; It consists of a dehydrator (7) for dewatering the excess sludge supplied through the transfer pipe from the settling tank to treat the sludge cake.

Referring to the operation of the embodiment of the present invention configured as described above are as follows.

The incoming wastewater is adjusted by adjusting the pH in the line mixer and reducing agent is added to the rear end of the line mixer in a state where the pH is adjusted, and then the reduced iodine waste water is stored in the flow control tank and then introduced into the aeration tank by microorganisms. The organics are treated, then solid-liquid separated in the settling tank, and then the microbial treated water is finally treated to meet the effluent water quality standards.

In addition, the supernatant liquid-separated from the settling tank is discharged out of the settling tank, some of the solid sludge is used as a conveying sludge is transferred to the aeration tank through the transfer pipe, the remaining excess sludge is transferred to the dehydrator.

Figure 2 is an exemplary view showing the configuration of the iodine wastewater treatment process and apparatus according to another embodiment of the present invention, as shown in the configuration is a line mixer (1) that the pH adjustment and reduction reaction of the supplied wastewater occurs; A flow rate adjustment tank (2) for uniformly adjusting the concentration of iodine waste water supplied from the line mixer through the transfer pipe; A pressurized floatation tank (3) for removing floating substances of iodine wastewater supplied from the flow rate adjustment tank through a transfer pipe; An aeration tank 5 in which microbial treatment of the iodine wastewater supplied from the pressurization flotation tank 3 is carried out through a transfer pipe; A settling tank (6) for solid-liquid separation of the microbial sludge supplied through the transfer pipe from the aeration tank; It consists of a dehydrator (7) for dewatering the excess sludge supplied through the transfer pipe from the settling tank to treat the sludge cake.

Referring to the operation of the embodiment of the present invention configured as described above are as follows.

Inflow of wastewater is adjusted by adjusting the pH in the line mixer and reducing agent is added to the rear end of the line mixer in a pH-adjusted state, and then the reduced iodine wastewater is stored in a flow adjusting tank, and then, in the reduced iodine wastewater. In order to remove the suspended solids, the suspended solids are removed through a pressurized floatation tank, and then flowed into the aeration tank to treat organic matter by microorganisms, and thereafter, solid-liquid separation in the settling tank, and then the microbial treated water meets the discharge water quality standards. Final treatment.

In addition, the supernatant liquid-separated from the settling tank is discharged out of the settling tank, some of the solid sludge is used as a conveying sludge transported to the aeration tank through the transfer pipe, the remaining excess sludge is sent to the dehydrator.

Figure 3 is an exemplary view showing the configuration of the iodine wastewater treatment process and apparatus according to another embodiment of the present invention, as shown in the configuration is a line mixer (1) to adjust the pH and the reduction reaction of the supplied wastewater; A flow rate adjustment tank (2) for uniformly adjusting the concentration of iodine waste water supplied from the line mixer through the transfer pipe; A pressurized floatation tank (3) for removing floating substances of iodine wastewater supplied from the flow rate adjustment tank through a transfer pipe; An activated carbon filter (4) for neutralizing the oxidative power of the iodine wastewater supplied from the pressurizing tank through the transfer pipe; An aeration tank 5 in which microorganism treatment of iodine wastewater supplied from the activated carbon filter is carried out through a transfer pipe; A settling tank (6) for solid-liquid separation of the microbial sludge supplied through the transfer pipe from the aeration tank; It consists of a dehydrator (7) for dewatering the excess sludge supplied through the transfer pipe from the settling tank to treat the sludge cake.

Referring to the operation of the embodiment of the present invention configured as described above are as follows.

Inflow of wastewater is adjusted by adjusting the pH in the line mixer and reducing agent is added to the rear end of the line mixer in a state where the pH is adjusted, and the reduced iodine wastewater is stored in a flow adjusting tank and thereafter, in the reduced iodine wastewater. In order to remove the suspended solids, the suspended solids are removed through a pressurized floatation tank, and then the stored and reduced iodine waste water is passed through an activated carbon filter to remove residual oxidizing power of the iodine waste water, and then introduced into the aeration tank to the microorganisms. The organic matter is treated, and then solid-liquid separated in the settling tank, and then the microbial treated water is finally treated to meet the discharged water quality standards.

In addition, the supernatant liquid-separated from the settling tank is discharged out of the settling tank, some of the solid sludge is used as a conveying sludge is transferred to the aeration tank through the transfer pipe, the remaining excess sludge is transferred to the dehydrator.

Hereinafter is a preferred embodiment of the present invention.

As a result of the test for the field application, all of the following Examples 1 to 3 were applicable.

(Example 1)

The incoming wastewater is adjusted by adjusting the pH in the line mixer and reducing agent is added to the rear end of the line mixer in a state where the pH is adjusted, and then the reduced iodine waste water is stored in the flow control tank and then introduced into the aeration tank by microorganisms. The organics were treated, then solid-liquid separated in the settling tank, and then the microbial treated water was finally treated to meet the effluent water quality standards. In addition, the supernatant liquid separated from the settling tank is discharged out of the settling tank, some of the solid sludge is used as a conveying sludge transported to the aeration tank through the transfer pipe, the rest of the excess sludge was configured to be transferred to the dehydrator was carried out the experiment.

During the reduction treatment, the pH was maintained at 8 and the reduction reaction was terminated at 0.05 ppm of hydrogen peroxide. When applied to microbial treatment without reducing, microbial treatment was impossible because it died immediately after injection of raw wastewater. At this time, iodine contained in the raw wastewater was about 2,000 ppm, and CODmn of the raw wastewater was introduced at 800 ppm. Biological treatment efficiency was maintained at 60% under these conditions.

(Example 2)

Inflow of wastewater is adjusted by adjusting the pH in the line mixer and reducing agent is added to the rear end of the line mixer in a pH-adjusted state, and then the reduced iodine wastewater is stored in a flow adjusting tank, and then, in the reduced iodine wastewater. In order to remove the suspended solids, the suspended solids are removed through a pressurized floatation tank, and then flowed into the aeration tank to treat organic matter by microorganisms, and thereafter, solid-liquid separation in the settling tank, and then the microbial treated water meets the discharge water quality standards. Final treatment. In addition, the supernatant liquid separated from the settling tank is discharged out of the settling tank, some of the solid sludge is used as a conveying sludge transported to the aeration tank through the transfer pipe, the rest of the excess sludge was configured to be transferred to the dehydrator was carried out the experiment.

During the reduction process, the pH was maintained at 8.5 and the hydrogen peroxide injection was completed at 0.1 ppm. When applied to microbial treatment without reducing treatment, the microbial treatment was not possible because it died immediately after the injection of raw wastewater. At this time, the iodine contained in the wastewater was about 2,000ppm, and the CODmn of the wastewater was introduced at 1,000ppm. Biological treatment efficiency was maintained at 70% under these conditions.

(Example 3)

Inflow of wastewater is adjusted by adjusting the pH in the line mixer and reducing agent is added to the rear end of the line mixer in a state where the pH is adjusted, and the reduced iodine wastewater is stored in a flow adjusting tank and thereafter, in the reduced iodine wastewater. In order to remove the suspended solids, the suspended solids are removed through a pressurized floatation tank, and then the stored and reduced iodine waste water is passed through an activated carbon filter to remove residual oxidizing power of the iodine waste water, and then introduced into the aeration tank to the microorganisms. The organics were treated, then solid-liquid separated in the settling tank, and then the microbial treated water was finally treated to meet the effluent water quality standards.

In addition, the supernatant liquid separated from the settling tank is discharged out of the settling tank, some of the solid sludge is used as a conveying sludge transported to the aeration tank through the transfer pipe, the rest of the excess sludge was configured to be transferred to the dehydrator was carried out the experiment. During the reduction process, the pH was maintained at 8 and the hydrogen peroxide injection was completed at 0.1 ppm. When applied to microbial treatment without reducing treatment, the microbial treatment was not possible because it died immediately after the injection of raw wastewater. At this time, the iodine contained in the wastewater was about 2,000ppm, and the CODmn of the wastewater was introduced at 1,000ppm. Biological treatment efficiency was maintained at 80% under these conditions.

The present invention is not limited to the above-described specific preferred embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

The present invention as described above has the advantage that can be treated by using the activated sludge method wastewater containing a high concentration of iodine, and microorganisms can be treated even when a high concentration of iodine can reduce the amount of wastewater treatment and It is a design that is expected to be used industrially as a useful design with the advantage that the processing cost and initial investment cost can be greatly reduced, thereby increasing the economics of new or existing treatment processes.

Claims (3)

In the treatment apparatus for treating the wastewater containing iodine using the activated sludge method, A line mixer in which pH adjustment and a reduction reaction of the supplied waste water occur; A flow rate adjustment tank for uniformly adjusting the concentration of iodine waste water supplied from the line mixer through the transfer pipe; An aeration tank in which microbial treatment of iodine wastewater supplied from the flow rate adjustment tank through a transfer pipe occurs; A settling tank for solid-liquid separation of the microbial sludge supplied through the transfer pipe from the aeration tank; Biological treatment apparatus for iodine wastewater, characterized in that consisting of a dehydrator for dewatering the excess sludge supplied through the transfer pipe from the sedimentation tank to treat the sludge cake. The method of claim 1, And a pressurized floatation tank for removing the floating substances of the iodine wastewater supplied through the transfer pipe next to the flow regulating tank. The method of claim 2, And a activated carbon filter for neutralizing the oxidative power of the iodine wastewater supplied through the feed pipe after the pressurization tank.

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