KR101372416B1 - Multiple feeding of influent in the bio-electrochemical waste-water treating apparatus and treatment method of waste-water using the same - Google Patents

Abstract

The present invention relates to a bio-electrochemical waste water treating apparatus for removing organic nitrogen and organic material in waste water including microorganism inhibitory factor in high concentration by branching the inlet of inlet water, and a method of treating waste water using the same. According to the method of treating waste water of the present invention, the inflowing path of the waste water is branched to separately inflowing the waste water to decrease the influence on microorganism accompanied with a biological waste water treating process by microorganism inhibitory factor such as an antibiotic, a disinfectant, etc. included in the waste water in high concentration, to increase the survival rate of the microorganism and to prevent the imbalance during the waste water treating process due to the extinction of the microorganism in advance. Thus, the organic nitrogen and organic material included in the waste water may be treated stably, and the waste water treating apparatus and the method of treating waste water may be usefully used for improving water quality.

Description

Multiple feeding of influent in the Bio-electrochemical waste-water treating apparatus and treatment method of waste-water using the same}

The present invention relates to a bioelectrochemical wastewater treatment apparatus for removing organic nitrogen and organic matter in wastewater containing a high concentration of microbial inhibitors by branching the inlet of the influent and a wastewater treatment method using the same.

Recently, due to the increase of population, the concentration of cities, and the rapid development of industry, environmental pollution is rapidly progressing, and the damage of water quality environment has emerged as a serious problem. In addition, nutrients such as nitrogen and phosphorus are introduced into rivers and lakes to cause eutrophication, causing problems such as destruction of aquatic ecosystems due to the death of fish and fish, a decrease in the value of water resources, and an increase in water treatment costs. . In addition, nitrogen in the nutrients is mainly present in the form of organic nitrogen and ammonia nitrogen in the sewage water, which is released into the water and then converted into nitrate nitrogen through the form of nitrite nitrogen, in the process Dissolved oxygen is consumed to deteriorate the water quality. Therefore, in order to solve this problem, apparatuses for simultaneously treating nitrogen and phosphorus by physical, chemical or biological unit processes have been developed.

In general, wastewater containing high concentrations of organic matter and nitrogen, such as livestock wastewater, is treated by removing the residual organic matter from the aerobic aeration tank, inducing a nitrification, and inducing denitrification by returning through an anaerobic digester.

However, since anaerobic digestion cannot completely remove organic matter and cannot completely oxidize ammonia nitrogen, an aerobic tank is installed at the rear of the anaerobic digester to aeration or an oxidation process is used to remove residual organic matter or to remove ammonia nitrogen. It is converted to nitrogen and discharged after reprocessing in connection with sewage treatment plant.

In Korea, most of the activated sludge is used to treat residual organic matter and ammonia in sewage and livestock wastewater. Activated sludge treatment can remove most suspended solids and organic matter, but the removal efficiency of nutrients such as nitrogen and phosphorus is only 20-40%.

When antibiotics are administered to humans and animals, most of them do not decompose and flow into the soil or sewage, and when spilled into sewage or the environment, they greatly increase the drug resistance of pathogenic microorganisms or increase environmental compliance. There is a high possibility of producing various kinds of super bacteria. Across the United States and Japan, there are cases of superbacteria in some hospitals in Korea.

In particular, most livestock wastewater contains high concentrations of organics and nutrients, and also contains antibiotics and disinfectants. Therefore, the livestock wastewater is emerging as a lethal inhibitor for nitrifying bacteria. When the concentration is high, the general method of treatment is to reduce the concentration of inhibitors in the influent by dilution of the influent to treat the inhibitors against the microorganisms to a certain level or less, and then to treat them by biological methods and then merge them into the sewage treatment plant.

In order to efficiently remove organic matter and ammonia remaining in the sewage and waste water, the present inventors have moved some of the organic matter flowing into the anaerobic tank through the inflow water in the anaerobic tank and then moved to the anaerobic tank, and the ammonia was transferred to the aerobic tank using a cation exchange membrane. The nitrate was denitrated by migrating to nitric acid by nitrifying bacteria in an aerobic tank and then increasing the rate of migration to the anoxic tank through an anion exchange membrane according to the concentration gradient (Patent Document 1).

However, such a device has a disadvantage in that it is not possible to efficiently cope with the treatment of organic matter and nitrogen when toxic substances such as high concentrations of antibiotics and disinfectants are present in the influent.

Therefore, the present inventors are studying an efficient wastewater treatment method for removing organic nitrogen and organic matter from wastewater in which microbial inhibitors such as high concentrations of antibiotics and disinfectants are present, and the inflow of influent water from the wastewater treatment apparatus consisting of anaerobic tank, aerobic tank, and denitrification tank is introduced. By dividing the path into anaerobic and aerobic tanks and separating them, the effects of microorganisms that are essential for biological wastewater treatment from the high concentration of microbial inhibitors are reduced, thereby increasing the survival rate and preventing imbalances in the wastewater treatment process due to the death of microorganisms. In addition, we have completed a stable wastewater treatment system that can remove organic nitrogen and organic matter contained in wastewater.

Republic of Korea Patent No. 10-11868450000

It is an object of the present invention to provide a bioelectrochemical wastewater treatment apparatus capable of improving the removal efficiency of organic nitrogen and organic matter in wastewater containing a high concentration of microbial inhibitors.

Another object of the present invention is to provide a method for efficiently treating wastewater using the wastewater treatment apparatus.

In order to achieve the above object,

Anaerobic tank;

An aerobic tank communicating with the anaerobic tank;

A denitrification tank communicating with the expiratory tank;

A cation exchange membrane for communicating the anaerobic tank and the aerobic tank;

An anion exchange membrane for communicating the aerobic tank and the denitrification tank;

A potential device comprising a reduction electrode provided in the anaerobic tank and an anode provided in the aerobic tank; And

In the bioelectrochemical wastewater treatment apparatus comprising an anaerobic tank effluent transport pipe communicating the anaerobic tank and the denitrification tank,

The anaerobic tank is provided with a waste water transfer pipe branched from the inlet provided in the lower portion communicating with the aerobic tank, the aerobic tank provides a bioelectrochemical wastewater treatment apparatus characterized in that it comprises a water level control tube communicated to the denitrification tank. .

Further, according to the present invention,

Separating the high concentration of wastewater containing organic nitrogen and organic matter into the anaerobic tank and the aerobic tank through an anaerobic tank inlet and a wastewater transfer pipe branched from the anaerobic tank inlet (step 1);

In the microbial layer formed on the reduction electrode provided in the anaerobic tank, to decompose the organic matter contained in the introduced wastewater, and to transfer ammonia contained in the introduced wastewater or ammonia generated by the decomposition of the organic matter to the aerobic tank through a cation exchange membrane Step (step 2);

In the microbial layer formed on the nitrification microorganism suspended in the aerobic tank or the anode electrode provided in the aerobic tank, decomposes the organic matter contained in the wastewater introduced through the wastewater conveying pipe branched from the anaerobic inlet, ammonia transferred through the cation exchange membrane or Converting the ammonia generated by decomposition of the organic material into nitrate (step 3); And

In the step 3, the nitrate converted in step 3 is transferred to a denitrification tank through an anion exchange membrane by a concentration gradient, and the denitrification reaction is performed by reacting the nitrate with an organic material (step 4). When the level of the aerobic tank is increased by the wastewater introduced through the transfer pipe to provide a method for treating high concentration of wastewater, further comprising the step (step 5) of transferring the water in the aerobic tank to the denitrification tank through the water level control pipe. do.

In the wastewater treatment method according to the present invention, by branching the inflow path of the wastewater and separating it, the effect of the microorganisms is reduced by reducing the influence on the microorganisms essential for the biological wastewater treatment process from the microbial inhibitors such as high concentration antibiotics and disinfectants included in the wastewater. By increasing the survival rate and preventing the imbalance of the wastewater treatment process by the killing of microorganisms in advance, it is possible to reliably remove the organic nitrogen and organic matter contained in the wastewater, which is useful for the wastewater treatment apparatus and method for water quality improvement. Can be used.

1 is a schematic view of a wastewater treatment apparatus according to an embodiment of the present invention.
Figure 2 is a graph comparing the removal efficiency of ammonia in the wastewater according to the concentration of the inhibitory factor against the microorganisms using the conventional wastewater treatment apparatus does not branch the wastewater treatment apparatus according to the present invention and the inflow path of the influent.
Figure 3 is a graph comparing the removal efficiency of organic matter in the wastewater according to the concentration of inhibitory factors for microorganisms using the conventional wastewater treatment apparatus does not branch the wastewater treatment apparatus according to the present invention and the inflow path of the influent.
Figure 4 is a schematic diagram of a conventional wastewater treatment apparatus that does not branch the inflow path of the influent water used in the experimental example of the present invention.

Hereinafter, the present invention will be described in detail.

It is an object of the present invention to provide a bioelectrochemical wastewater treatment apparatus capable of improving the removal efficiency of organic nitrogen and organic matter in wastewater containing a high concentration of microbial inhibitors.

More specifically,

Anaerobic tank (1);

An aerobic tank (2) communicating with the anaerobic tank (1);

A denitrification tank 3 communicating with the exhalation tank 2;

A cation exchange membrane (4) for communicating the anaerobic tank (1) and the aerobic tank (2);

An anion exchange membrane (5) for communicating the exhalation tank (2) with the denitrification tank (3);

A potential device 8 composed of a reduction electrode 6 provided in the anaerobic tank 1 and an oxidation electrode 7 provided in the aerobic tank 2; And

In the bioelectrochemical wastewater treatment apparatus comprising an anaerobic tank effluent transport pipe (9) for communicating the anaerobic tank (1) and the denitrification tank (3),

The anaerobic tank (1) is provided with a waste water transfer pipe (11) branched from the inlet (10) provided in the lower portion in communication with the exhalation tank (2) and the exhalation tank (2) is in communication with the denitrification tank (3) It provides a bioelectrochemical wastewater treatment apparatus, characterized in that the control tube 12 is provided.

Hereinafter, the wastewater treatment apparatus according to the present invention will be described in detail with reference to FIG. 1.

In the wastewater treatment apparatus according to the embodiment of the present invention, the anaerobic tank (1) and the denitrification tank (3) communicate with each other in the order of anaerobic tank (1) → aerobic tank (2) → denitrification tank (3). It has a structure connected through the parts (20, 21), the communication portion 20 between the anaerobic tank (1) and the aerobic tank (2) is provided with a cation exchange membrane (4), the aerobic tank (2) and denitrification tank ( The communicating portion 21 between 3) is provided with an anion exchange membrane 5. Further, a potential device 8 composed of a reduction electrode 6 provided in the anaerobic tank 1 and an anode electrode 7 provided in the aerobic tank 2, and the anaerobic tank 1 and the denitrification tank 3 communicate with each other. Anaerobic tank effluent transport pipe 9 is provided to. Furthermore, the anaerobic tank 1 is provided with a wastewater transfer pipe 11 branched from the inlet 10 provided in the lower portion to communicate with the aerobic tank 2, and the aerobic tank 2 controls the water level in the aerobic tank 2. In order to communicate with the denitrification tank (3) comprises a water level control tube (12).

First, in the wastewater treatment apparatus according to the present invention, an inlet 10 is provided at the lower portion of the anaerobic tank 1, and a wastewater transport pipe 11 branched from the inlet 10 communicates with the aerobic tank 2. Connected. Wastewater containing factors that inhibit microorganisms, such as high concentrations of antibiotics and disinfectants, organic nitrogen and organic matter, enters the anaerobic tank 1 through the inlet 10 or branched from the inlet 10. Inflow into the aerobic tank (2). Wastewater introduced into the anaerobic tank (1) is the first decomposition of the hard-decomposable organic matter in the wastewater through the anaerobic fermentation reaction using microorganisms. In addition, an anaerobic tank effluent water may be transported to the lower part of the denitrification tank (3) in the upper portion of the anaerobic tank (1), the inflow water containing residual organic matter and organic nitrogen that could not pass through the cation exchange membrane (4) to the aerobic tank (2) The transfer pipe 9 is provided.

Specifically, the anaerobic tank (2) is decomposed organic matter through the process of hydrolysis, organic acid generation, methane fermentation, etc. when the wastewater containing a high concentration of inhibitors and organic matter of the microorganism is introduced. In addition, since some wastewater is introduced into the aerobic tank through the wastewater transfer pipe 11 branched from the inlet 10, the concentration of microbial inhibitors such as antibiotics and disinfectants that enter the anaerobic tank 1 is lowered. Influence on the microorganisms in the cells is reduced, which increases the survival rate of the microorganisms. Therefore, it is possible to promote the decomposition of organic matter by microorganisms, thereby accelerating the next wastewater treatment process. A layer of microorganisms is formed on the reduction electrode 6 in the anaerobic tank 1, and organic matter is decomposed or re-decomposed on the surface of the microbial layer.

In the wastewater treatment apparatus according to the present invention, the cation exchange membrane 4 serves to selectively move ammonia present in the anaerobic tank to an aerobic tank. The ammonia may be present in the wastewater or may be generated during the decomposition of organic matter. As the cation exchange membrane 4, any cation exchange membrane having a selectivity to a monovalent cation can be used without particular limitation, and for example, CMX (Atom Japan, NEOSRPTA membrane) can be used.

In the wastewater treatment apparatus according to the present invention, the aerobic tank (2) is a wastewater containing a factor, organic nitrogen and organic substances that inhibit microorganisms such as antibiotics, disinfectants through the wastewater transfer pipe 11 branched from the inlet (10) When is introduced, the decomposition of organic matter is made by microorganisms. Since the wastewater is separately introduced into the aerobic tank (1) as well as the aerobic tank (2), it is possible to prevent the killing of microorganisms by the high concentration of microbial inhibitors in the anaerobic tank (1), thereby preventing the imbalance of the wastewater treatment process in advance. It can be, and since the decomposition of organic matter is also carried out in the aerobic tank (2) increases the decomposition efficiency of organic matter.

In addition, the aerobic tank (2) is present in the wastewater flowing into the anaerobic tank (1) or in the wastewater flowing into the ammonia or aerobic tank (2) introduced through the cation exchange membrane (4) generated during the decomposition of organic matter in the anaerobic tank (4) The ammonia existing or generated during the decomposition of organic matter in the aerobic tank is converted to nitrate in the microorganism in the aerobic tank 2 and the microbial layer formed on the anode 7. The process of converting to nitrate may vary depending on the type of microorganism used, and some examples thereof are shown in Schemes 1 to 4 below. Substrates in parentheses in the following schemes refer to microorganisms that convert to nitrates.

<Reaction Scheme 1>

^{_{NH 4 + + 1.5O 2 ---->}} NO 2 - + H 2 O + 2H + (Nitrosomonas)

<Reaction Scheme 2>

^{_{NO 2 - + 0.5O 2 ---->}} NO 3 - (Nitrobacter)

<Reaction Scheme 3>

^{_{NH 4 + + 2H 2 O +}} 6Fe 3 + ---> NO 2 - + 6Fe 2 + + 8H + (Iron reducing bacteria)

<Reaction Scheme 4>

_{^{NO 2 - + 2Fe 3 + +}} H 2 O ---> NO 3 - + 2Fe 2 + + 2H + (Iron reducing bacteria)

Schemes 1 and 2 are reactions that occur when the dissolved oxygen (DO) concentration is sufficiently maintained in the nitrification reaction. That is, when no organic matter is present and the concentration of ammonia is low, the dissolved oxygen amount deficiency does not occur and oxidation of ammonia occurs smoothly.

Schemes 3 and 4 are oxidation reactions of ammonia that occur in a state in which oxygen is not supplied smoothly. When wastewater such as livestock wastewater is introduced, the concentration of ammonia reaches thousands of ppm, so that oxygen is not supplied smoothly, so that the reactions of Schemes 3 and 4 may occur.

On the other hand, when oxygen is not supplied smoothly in the aerobic tank 2, another reaction that may occur may include a denitrification reaction as in Scheme 5 below.

<Reaction Scheme 5>

_{^{NH 4 + + NO 2 - ----}} > N 2 + 2H 2 O (Anammox bacteria)

Furthermore, the upper part of the exhalation tank (2) is provided with a water level control tube (12) communicating with the denitrification tank (3), in order to adjust the water level in the exhalation tank (2) in accordance with the amount of wastewater introduced into the exhalation tank (2), The wastewater treated by performing the aerobic tank process is transferred to the denitrification tank 3 through the water level control tube 12.

In addition, the aerobic tank 2 may further include an aeration 19 provided with the diffuser 14 so as to perform the nitrification smoothly. The aeration 19 provided with the diffuser 14 may be provided under the aeration tank 2 to provide oxygen supply and fluidity of the liquid.

In the wastewater treatment apparatus according to the present invention, the potential device 8 includes a reduction electrode 6 and an anode electrode 7 provided in the aerobic tank 2 in the anaerobic tank, so that the electric field generated when the voltage is applied. As a result, the speed at which ammonia in the anaerobic tank 1 moves to the aerobic tank 2 through the cation exchange membrane 4 is improved, and serves to assist the decomposition of organic matter in the reduction electrode 6 of the anaerobic tank 1. At this time, by adjusting the magnitude of the voltage applied to the potential device 8, it is possible to control the rate at which the ammonia is passed through the cation exchange membrane (8) to the aerobic tank (2). In addition, when voltage is applied at the anode 7 of the aerobic tank 2, the rate at which the nitrate generated in the aerobic tank 2 is transferred to the denitrification tank 3 by the concentration gradient can be controlled by the generated electric field. .

In the wastewater treatment apparatus according to the present invention, the anion exchange membrane (5) serves to selectively pass the nitrate generated in the aerobic tank (2) to the denitrification tank (3). The anion exchange membrane 5 may be used without particular limitation as long as it is an anion exchange membrane having selectivity to monovalent anions, and for example, AMX (NEOSRPTA membrane, Japan) may be used.

In the wastewater treatment apparatus according to the present invention, in the denitrification tank (3), the nitrate and the anaerobic tank (1) and the effluent tank (2) that are selectively transported through the anion exchange membrane (5) of the aerobic tank (2) are transported. The organic matter present is subjected to a denitrification reaction as shown in Scheme 6, and the nitrogen produced by the denitrification reaction is discharged through the gas outlet 15.

<Reaction Scheme 6>

2NO ₃ ^- + 6H _{2 ^{----> N 2 + 2OH - +}} 4H 2 O

Due to the provision of the wastewater conveying pipe 11 branched from the inlet 10 of the anaerobic tank 2, it is possible to actively cope with changes in the concentration of microbial inhibitors such as antibiotics and disinfectants contained in the wastewater. In particular, when wastewater containing a high concentration of microbial inhibitors flows into the anaerobic tank (1) and aerobic tank (2), the concentration of microbial inhibitors is lowered, so that the anaerobic tank (1) kills the microorganisms essential for the organic decomposition process. It can be prevented in advance to promote the decomposition of organic matter by the microorganism, and the ammonia generated by the decomposition of organic matter can be moved to the aerobic tank through the cation exchange membrane (4) to increase the removal efficiency of ammonia. In addition, in the aerobic tank 2, as the wastewater is directly introduced, the ammonia existing in the wastewater or generated after decomposition of organic matter does not have to move, thereby increasing the rate of conversion to nitrate.

Furthermore, since the survival rate of microorganisms in the anaerobic tank 1 increases, when the microorganisms in the anaerobic tank 1 are transferred to the denitrification tank 3 through the anaerobic tank effluent transport pipe 9, the effect of denitrification can be maximized. Organic matter and ammonia are removed efficiently.

The present invention also provides a method of efficiently treating wastewater comprising the following steps:

Separating the high concentration of wastewater containing organic nitrogen and organic matter into the anaerobic tank and the aerobic tank through an anaerobic tank inlet and a wastewater transfer pipe branched from the anaerobic tank inlet (step 1);

In the microbial layer formed on the reduction electrode provided in the anaerobic tank, to decompose the organic matter contained in the introduced wastewater, and to transfer ammonia contained in the introduced wastewater or ammonia generated by the decomposition of the organic matter to the aerobic tank through a cation exchange membrane Step (step 2);

In the microbial layer formed on the nitrification microorganisms suspended in the aerobic tank or the anode electrode provided in the aerobic tank, decomposes the organic matter contained in the wastewater introduced through the wastewater transfer pipe branched from the anaerobic inlet, ammonia transferred through the cation exchange membrane or Converting the ammonia generated by decomposition of the organic material into nitrate (step 3); And

In the step 3, the nitrate converted in step 3 is transferred to a denitrification tank through an anion exchange membrane by a concentration gradient, and the denitrification reaction is performed by reacting the nitrate with an organic material (step 4). When the level of the aerobic tank is increased by the wastewater introduced through the transfer pipe step of transferring the water in the aerobic tank to the denitrification tank through the level control pipe (step 5).

Hereinafter, the wastewater treatment method according to the present invention will be described in more detail step by step.

First, step 1 is a step of separating and introducing a high concentration of wastewater containing organic nitrogen and organic matter into the anaerobic tank and the aerobic tank through an anaerobic tank inlet and a wastewater transfer pipe branched from the anaerobic tank inlet.

Wastewater flowing into the aerobic tank through the wastewater transfer pipe inflow into the anaerobic tank and branched from the anaerobic tank inlet in the step 1 will be a livestock wastewater, wastewater including organic nitrogen, organic matter, microorganism inhibitors such as high concentrations of antibiotics, disinfectants, etc. Can be. In addition, anaerobic or aerobic wastewater inflow can be adjusted according to the concentration of the microbial inhibitors of the incoming wastewater.

Next, in the wastewater treatment method according to the present invention, the step 2 is to cation exchange the ammonia contained in the wastewater and the organic matter contained in the wastewater introduced from the microbial layer formed on the reduction electrode provided in the anaerobic tank It is the step of moving to the aerobic tank through the membrane.

At this time, the ammonia can be selectively introduced into the aerobic tank through the cation exchange membrane, the speed of the ammonia passes through the cation exchange membrane is increased as the magnitude of the voltage supplied from the external power source.

The microorganism may be used without particular limitation as long as it is an anaerobic microorganism capable of carrying out anaerobic fermentation reaction, and among such microorganisms, there may be a species capable of transferring electrons directly to the electrode, such as Shewanella sp. There may also be species capable of supplying electrons to the electrodes through redox reactions using chemicals. In addition, they can be utilized as an electromotive force for organic material decomposition by using the potential difference between the anode and the cathode as an electromotive force when decomposing the organic material.

Next, in the wastewater treatment method according to the present invention, the step 3 is introduced through the wastewater transfer pipe branched from the anaerobic inlet in the microbial layer formed on the nitric oxide microorganisms floating in the aerobic tank or the anode provided in the aerobic tank. Decomposing organic matter contained in the wastewater, and ammonia transferred through the cation exchange membrane or ammonia generated by the decomposition of the organic matter is converted to nitrate.

The microorganism of step 3 may be used without particular limitation as long as it is an aerobic microorganism capable of nitrifying ammonia under aerobic conditions. In addition, the microorganism formed on the anode may serve to receive the electrons necessary for the reduction of the chemical by finally receiving the electrons generated in the cathode of step 2.

In addition, if the dissolved oxygen content is sufficiently maintained, a reaction for converting ammonia to nitrate is carried out through a reaction as in Schemes 1 and 2, and a livestock wastewater containing a high concentration of ammonia flows in such a state that supply of oxygen is not desired. In the reaction of converting ammonia to nitrate through the same reaction schemes 3 and 4.

Furthermore, when the microbial layer is thickened on the anode provided in the aerobic tank, the denitrification reaction of nitrate may be performed in the microbial layer as in Scheme 5.

Next, in the wastewater treatment method according to the present invention, the step 4 is to move the nitrate converted in step 3 to the denitrification tank through an anion exchange membrane by the concentration gradient, and to perform the denitrification reaction by reacting the nitrate with an organic material Step.

At this time, the nitrate is selectively introduced into the denitrification tank through the anion exchange membrane by the concentration gradient, the greater the magnitude of the voltage supplied to the potential device, the faster the ammonia passes from the anaerobic tank through the cation exchange membrane to the aerobic tank to improve the As the concentration increases, the concentration of nitrate increases, which increases the rate at which the nitrate is transferred to the denitrification tank through the anion exchange membrane.

In addition, the organic material reacting with the nitrate may be supplied to the influent flowing into the denitrification tank through the anaerobic tank effluent transport pipe and the water level control pipe. The introduced organic matter and nitrate are discharged to nitrogen gas by performing a denitrification reaction as in Scheme 6 described above.

In addition, in the wastewater treatment method according to the present invention, step 5 is a step of transferring the water in the aerobic tank to the denitrification tank through the level control pipe when the level of the aerobic tank is increased by the wastewater introduced through the wastewater transfer pipe.

Wastewater treatment method according to the present invention by dividing the wastewater containing microbial inhibitors, such as antibiotics, disinfectants, organic nitrogen, organic matter, etc. into the anaerobic and aerobic tank to separate, and in advance, in the anaerobic tank to kill the microorganisms essential for the organic decomposition process It can be prevented to promote the decomposition of organic matter by the microorganism, and can move the ammonia generated by the decomposition of the organic matter to the aerobic tank to increase the removal efficiency of ammonia. In addition, as the wastewater flows directly into the aerobic tank, the ammonia existing in the wastewater introduced into the aerobic tank or generated after decomposition of organic matter does not have to move, thereby increasing the rate of conversion to nitrate. Furthermore, since the survival rate of microorganisms in the anaerobic tank is increased, when the anaerobic microorganism is transferred to the denitrification tank, the denitrification effect can be maximized, and organic matter and ammonia remaining in the waste water are efficiently removed.

As described above, in the wastewater treatment method according to the present invention, the branched inflow path of the wastewater is separated and introduced, thereby affecting the microorganisms essential for the biological wastewater treatment process from microbial inhibitors such as high concentration antibiotics and disinfectants included in the wastewater. To increase the survival rate of microorganisms and to prevent the imbalance of the wastewater treatment process by the killing of microorganisms in advance, so that it is possible to stably remove the organic nitrogen and organic matter contained in the wastewater. And the method can be usefully used.

Hereinafter, the present invention will be described in more detail with reference to the following examples.

However, the following examples are illustrative of the present invention, and the present invention is not limited by the following examples.

< Example  1> Performed organic matter and organic nitrogen removal wastewater treatment device

As shown in FIG. 1, a reactor was constructed to operate a wastewater treatment apparatus. The cation exchange membrane between the anaerobic tank and the aerobic tank was used as CMX (Japan Astom, NEOSRPTA membrane), and the anion exchange membrane between the aerobic tank and the denitrification tank was used as AMX (Japan Astom, NEOSRPTA membrane).

Inlet water containing ammonia 1,702 mg N / L nitrate 220 mg N / L, organics 10,132 mg COD / L, and 10 mg N / L nitrite nitrogen through the anaerobic inlet and the branched wastewater feed pipe, respectively, in a ratio of 1: 1 The reactor was separated inflow, pH 8.3, hydraulic retention time (HRT) was 5 days, reactor capacity was 10 L, and operating temperature was 24-27 ° C. Aeration was carried out only in the aerobic tank and dissolved oxygen (DO) was maintained at 4-8 ppm. The material of the electrode mounted inside each reactor was graphite, and 3000 mV potential was applied to the anaerobic tank-aerobic tank by using a power supply, where the electrode of the anaerobic tank was the reduction electrode and the electrode of the aerobic tank was oxidized. Used as an electrode. Operation under these conditions led to the separation of organics and organic nitrogen.

< Experimental Example  1> Evaluation of Ammonia Treatment Efficiency of the Invention and the Conventional Wastewater Treatment System

In the case of treating wastewater containing inhibitors of microorganisms with the wastewater treatment apparatus according to the present invention, the following experiment was carried out to determine the degree to which the treatment efficiency of ammonia contained in the wastewater is improved compared to the conventional wastewater treatment apparatus. It was.

As the conventional wastewater treatment apparatus, the wastewater treatment apparatus of FIG. 4 (hereinafter referred to as “IEBR (ion exchange biological reactor)”) consisting of an inflow water tank, an aerobic tank, an anoxic tank, a cation exchange membrane, and an anion exchange membrane was used.

Specific experimental method is to use the thiourea (thiourea), which is well known as an inhibitor of nitrifying bacteria as the inhibitor of the microorganisms according to the concentration of thiourea and the treatment efficiency of ammonia of the conventional wastewater treatment apparatus (IEBR) Compared. Thiourea is known to contain substantially livestock wastewater at concentrations similar to those of these experimental conditions. The experimental results of the treatment efficiency of ammonia according to the concentration of thiourea are shown in FIG. 2 by constructing and operating a reactor of the wastewater treatment apparatus and the conventional wastewater treatment apparatus (IEBR) according to the present invention as in Example 1. It was.

As a result of the comparative experiment shown in FIG. 2, the ammonia concentration of the influent was maintained at 1,702 ppm and measured, and as a result, when the concentration of thiourea was 0.2 ppm in the conventional wastewater treatment apparatus (IEBR), 1500 in the effluent was measured. It was determined that ammonia was contained in the ppm, from which the ammonia treatment efficiency was about 10%. In addition, when the concentration of thiourea was increased to 0.6 ppm, it was determined that the ammonia in the effluent was not different from the concentration of the ammonia in the influent. From this, it can be seen that the treatment efficiency of the ammonia decreased to 0%.

On the other hand, in the wastewater treatment apparatus according to the present invention, when the concentration of thiourea was 0.2 ppm, it was determined that about 1000 ppm of ammonia was contained in the effluent, and the treatment efficiency of ammonia was about 38%. In addition, when the concentration of thiourea was increased to 0.6 ppm, it was estimated that about 1600 ppm of ammonia was contained in the effluent, and the ammonia treatment efficiency was about 5%.

That is, in the wastewater treatment apparatus according to the present invention, when thiourea is present at a low concentration (0.2 ppm), the wastewater treatment apparatus was found to be about 30% superior to the conventional wastewater treatment apparatus, and the concentration of thiourea is about three times. Increasingly, the conventional wastewater treatment apparatus could not treat ammonia at all, but the wastewater treatment apparatus according to the present invention was still able to treat ammonia.

The above results indicate that the wastewater treatment apparatus according to the present invention, which branched the inflow path of the influent, reduces the influence of inhibitors on microorganisms such as thiourea, thereby significantly improving the treatment efficiency of ammonia than the conventional wastewater treatment apparatus (IEBR). It can be seen that it can be achieved.

< Experimental Example  2> the present invention and the conventional wastewater treatment apparatus ( IEBR Evaluation of Treatment Efficiency of Organics

In the case of treating wastewater containing inhibitors of microorganisms with the wastewater treatment apparatus according to the present invention, the following experiment was carried out to determine the degree to which the treatment efficiency of organic matter contained in the wastewater is improved compared to the conventional wastewater treatment apparatus. It was.

Specific experimental method is configured and operated the reactor of the wastewater treatment apparatus and the conventional wastewater treatment apparatus (IEBR) according to the present invention as in Example 1 to treat the organic matter according to the concentration of thiourea as in Experimental Example 2 The results of comparative experiments on the efficiency are shown in FIG. 3.

As a result of the comparative experiment shown in FIG. 3, the concentration of organic matter in the influent was kept at a constant 10,132 mg COD / L and measured. When the concentration of thiourea is 0.2 ppm in the conventional wastewater treatment apparatus (IEBR), In the effluent, 6,000 mg COD / L of organic matter was measured. From this, the treatment efficiency of organic matter was about 40%. In addition, when the concentration of thiourea was increased to 0.6 ppm, it was determined that the effluent contained more than 9,000 mg COD / L of organic matter, and from this, the treatment efficiency of organic matter decreased rapidly to about 10%. Able to know.

On the other hand, in the wastewater treatment apparatus according to the present invention, when the concentration of thiourea was 0.2 ppm, it was determined that 2,000 mg COD / L of organic matter was contained in the effluent, and the organic matter treatment efficiency was about 80%. In addition, when the concentration of thiourea was increased to 0.6 ppm, the effluent contained about 3,000 mg COD / L of organic matter, and the organic matter treatment efficiency was about 70%. That is, even though the concentration of thiourea is increased by about three times, it can be seen that the organic treatment efficiency is only reduced by about 10%.

The above results indicate that the wastewater treatment apparatus according to the present invention, which branched the inflow path of the influent, reduces the influence of inhibitors on microorganisms such as thiourea, thereby significantly reducing the treatment efficiency of organic matter than the conventional wastewater treatment apparatus (IEBR). It can be seen that it can be achieved.

Therefore, the wastewater treatment method according to the present invention by dividing the inflow path of the wastewater separated and introduced, reducing the effect on the microorganisms essential for the biological wastewater treatment process from the microbial inhibitors such as high concentration antibiotics, disinfectants contained in the wastewater By increasing the survival rate of microorganisms and preventing the imbalance of the wastewater treatment process by the killing of microorganisms in advance, it is possible to stably remove the organic nitrogen and organic matter contained in the wastewater. It can be useful.

Each code | symbol of FIG. 1 is as follows.
1: anaerobic tank 2: aerobic tank
3: denitrification tank 4: cation exchange membrane
5: anion exchange membrane 6: cathode
7: anode 8: potential device
9: anaerobic tank outflow pipe 10: inlet
11: wastewater delivery pipe 12: water level control pipe
13: outlet 14: diffuser
15: gas outlet 16: magnetic bar
17: Anaerobic & Existing Tank Communication Unit 18: Anaerobic & Denitrification Communication Unit
19: Aeration
In addition, each code | symbol of FIG. 4 is as follows.
1: inlet tank 2: aerobic tank
3: anaerobic tank 4: communication
5: communicating part 6: cation exchange membrane
7: anion exchange membrane 8: diffuser
9: aeration 10: influent feed pipe
11: influent feed line 12: propeller

Claims (11)

Anaerobic tank;
An aerobic tank communicating with the anaerobic tank;
A denitrification tank communicating with the expiratory tank;
A cation exchange membrane for communicating the anaerobic tank and the aerobic tank;
An anion exchange membrane for communicating the aerobic tank and the denitrification tank;
A potential device comprising a reduction electrode provided in the anaerobic tank and an anode provided in the aerobic tank; And
In the bioelectrochemical wastewater treatment apparatus comprising an anaerobic tank effluent transport pipe communicating the anaerobic tank and the denitrification tank,
The anaerobic tank has a wastewater conveying pipe branched from an inlet provided in the lower portion and communicated with the aerobic tank, wherein the aerobic tank has a water level control tube communicating with the denitrification tank.
The method of claim 1,
Bio-electrochemical wastewater treatment apparatus characterized in that the high concentration of wastewater is separated into the anaerobic tank and the aerobic tank through the inlet port of the anaerobic tank and the wastewater transfer pipe branched therefrom.
The method of claim 1,
The anaerobic tank upper portion of the anaerobic tank is characterized in that an anaerobic tank effluent transport pipe for transporting the influent containing organic matter and organic nitrogen to the lower denitrification tank is provided.
The method of claim 1,
In the anaerobic tank bioelectrochemical wastewater treatment apparatus characterized in that the organic matter in the wastewater introduced by using the reduction electrode microorganism provided in the anaerobic tank is decomposed.
The method of claim 1,
The cation exchange membrane is a bioelectrochemical wastewater treatment apparatus, characterized in that for selectively moving the ammonia in the anaerobic tank to the aerobic tank.
The method of claim 1,
In the aerobic tank, bioelectrochemical wastewater treatment apparatus, characterized in that organic matter in wastewater introduced by using microorganisms is decomposed.
The method of claim 1,
The aerobic tank converts the ammonia generated through the cation exchange membrane from the anaerobic tank, the ammonia existing in the wastewater introduced into the aerobic tank, and the ammonia produced during the decomposition of organic matter in the aerobic tank to the nitrate in the microbial layer formed on the aerobic tank and the anode. Bioelectrochemical wastewater treatment apparatus, characterized in that.
The method of claim 1,
The anaerobic tank is provided with a reduction electrode and the aerobic tank is provided with an anode, and the bioelectrochemical wastewater, characterized in that to improve the speed of ammonia in the anaerobic tank to move to the aerobic tank through the cation exchange membrane by the electric field generated when the voltage is added. Processing unit.
The method of claim 1,
The anion exchange membrane is a bioelectrochemical wastewater treatment apparatus, characterized in that for selectively moving the nitrate produced in the aerobic tank to the denitrification tank.
The method of claim 1,
The water level control pipe is a bioelectrochemical wastewater treatment apparatus characterized in that when the level of the aerobic tank is increased to transfer the water in the aerobic tank to the denitrification tank to adjust the water level.
Separating the high concentration of wastewater containing organic nitrogen and organic matter into the anaerobic tank and the aerobic tank through an anaerobic tank inlet and a wastewater transfer pipe branched from the anaerobic tank inlet (step 1);
In the microbial layer formed on the reduction electrode provided in the anaerobic tank, to decompose the organic matter contained in the introduced wastewater, and to transfer ammonia contained in the introduced wastewater or ammonia generated by the decomposition of the organic matter to the aerobic tank through a cation exchange membrane Step (step 2);
In the microbial layer formed on the nitrification microorganism suspended in the aerobic tank or the anode electrode provided in the aerobic tank, decomposes the organic matter contained in the wastewater introduced through the wastewater conveying pipe branched from the anaerobic inlet, ammonia transferred through the cation exchange membrane or Converting the ammonia generated by decomposition of the organic material into nitrate (step 3); And
In the step 3, the nitrate converted in step 3 is transferred to a denitrification tank through an anion exchange membrane by a concentration gradient, and the denitrification reaction is performed by reacting the nitrate with an organic material (step 4). When the level of the aerobic tank is increased by the wastewater introduced through the transfer pipe, the method further comprises the step (step 5) of transferring the water in the aerobic tank through the water level control pipe to the denitrification tank.

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