KR20210040632A - Wastewater treatment system using anaerobic ammonium oxidation system in mainstream of mwtp by nitrification reaction of various high concentration waste liquid and microorganism culture reinforcement - Google Patents

Abstract

The present invention provides a wastewater treatment system based on an anaerobic ammonium oxidation scheme in mainstream of MWTP by nitrification reaction of various high-concentration waste liquids and microorganism culture reinforcement. The wastewater treatment system includes anaerobic ammonium oxidation reactor of water treatment process (main treatment process, mainstream) into which sewage containing ammonia nitrogen is introduced; and a nitrite oxidation reactor that oxidizes ammonia nitrogen-containing companion water generated in the sludge treatment process, external high-concentration ammonia nitrogen-containing wastewater, or both ammonia nitrogen into nitrite nitrogen, wherein the effluent from the nitrite oxidation tank is introduced into the anaerobic ammonium oxidation tank of the water treatment process, and the anaerobic ammonium oxidation reactor removes ammonia nitrogen using an anamax reaction.

Description

WASTEWATER TREATMENT SYSTEM USING ANAEROBIC AMMONIUM OXIDATION SYSTEM IN MAINSTREAM OF MWTP BY NITRIFICATION REACTION OF VARIOUS HIGH CONCENTRATION MICROORGANISM CULTURE REINFORCEMENT}

The present invention relates to a sewage treatment system based on an anaerobic ammonium oxidation method in a sewage treatment plant water treatment process through a nitrite reaction of various high concentration waste liquids and enhancement of microbial culture.

Among pollutants, nutrients are mainly composed of phosphorus derived from industrial products such as nitrogen and pesticides discharged from sewage and livestock manure, and when they are mixed in rivers, eutrophication occurs, which adversely affects the aquatic ecosystem. In general, nutrients have a large amount of nitrogen derived from wastewater, and nitrogen causes eutrophication and causes a decrease in dissolved oxygen in rivers, and thus nitrogen removal is required. Major nitrogen components in wastewater include ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, and organic nitrogen. To remove this, wastewater treatment technology in which denitrification technology is fused is required.

In order to remove nitrogen in a sewage treatment plant, a physicochemical method of removing nitrogen by introducing chemicals and a biological nitrogen removal process using microorganisms are mainly used. When the nitrogen concentration in the wastewater is low, an ion exchange method or an oxidation method using chlorine or ozone can be used. However, in the case of a physicochemical method, secondary water pollution may occur due to an injected drug, and thus, a biological nitrogen removal process is recently used.

When the nitrogen concentration in the wastewater is high, the biological process is efficient, and as an example of a biological process, ammonia nitrogen is oxidized to nitrite nitrogen or nitrate nitrogen by digestive bacteria, and nitrous acid by denitrification bacteria by adding an electron donor such as methanol. A method of removing nitrogen from wastewater by reducing nitrogenous nitrogen or nitrate nitrogen with nitrogen gas is known.

This method requires an excess of oxygen rather than the oxidizing power required to oxidize ammonia nitrogen to nitrogen gas, and thus, requires an excessive amount of oxygen to supply microorganisms, resulting in a high cost in terms of energy required for wastewater treatment. In addition, the cost of adding organic substances such as methanol as an electron donor for the denitrification reaction is required, and the denitrification bacteria grown by ingesting these organic substances become excess sludge, resulting in a waste treatment cost problem. In particular, since nitrate nitrogen is in an oxidized state compared to nitrite nitrogen, the cost of supplying oxygen is further increased, and more electron donors are required to reduce it, and excess sludge generated is also increased.

Accordingly, a denitrification method using autotrophic denitrification microorganisms capable of reacting two components with ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor under oxygen-free conditions and generating nitrogen gas has been proposed. This denitrification reaction is referred to as anaerobic ammonium oxidation (ANAMMOX) reaction (hereinafter, referred to as'Anamox reaction'), and the autotrophic denitrification microorganism used is also referred to as ANNAMOX bacteria. According to the denitrification method using the Anamox reaction, energy can be saved by oxidizing ammonia nitrogen using the oxidizing power of nitrite nitrogen, and there is no need to supply additional oxygen or add organic substances such as methanol. You can also save money.

In order to induce the ANAMMOX reaction, most of the technologies targeting the backwash water of the sludge treatment process (Sidestream) were used, and this is the core technology of Anamox technology, which is the accumulation of nitrite nitrogen (Nitrite buildup) for water treatment. This is because there are limitations in the process (Mainstream). Nitrite is an intermediate step in nitrification, and it is difficult to exist in the form of nitrogen in its natural state, so it inhibits the activity of nitrite oxidizing bacteria (NOB) through artificial manipulation by the driver. Or, it may exist through control of the number of individuals. Therefore, the oxidation of ammonia nitrogen to nitrite nitrogen is called nitrite reaction. In particular, since nitrogen in the sewage flowing into the sewage treatment plant is mostly present in the form of ammonia nitrogen, it is separate for the anamox reaction in the water treatment process. The supply of nitrite nitrogen is required. To this end, continuous research has been conducted to induce nitrification reaction in the inflow sewage in the water treatment process (Mainstream), but satisfactory results have not been presented so far.

The present invention is to solve the above-described problem, by nitrite oxidation of reflux water containing high concentration of ammonia nitrogen and external high concentration wastewater to stably supply nitrite nitrogen required for Anamax reaction, and reflux water and external high concentration wastewater It is possible to provide a sewage treatment system that can improve the operation and efficiency of the sub-treatment plant by simultaneously performing the treatment of

However, the problems to be solved by the present invention are not limited to those mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, an anaerobic ammonium oxidation reactor of a water treatment process (main treatment process, mainstream) in which sewage containing ammonia nitrogen is introduced; And a nitrite reaction tank for oxidizing ammonia nitrogen-containing companion water generated in the sludge treatment process, external high-concentration ammonia nitrogen-containing wastewater, or ammonia nitrogen in the two to nitrite nitrogen. Including, the effluent water discharged from the nitrite reaction tank is introduced into the anaerobic ammonium oxidation reaction tank of the water treatment process, and the anaerobic ammonium oxidation reaction tank is to remove ammonia nitrogen using an anamax reaction, to the sewage treatment system About.

According to an embodiment of the present invention, the primary sedimentation basin for inflow and precipitation of sewage; An anaerobic tank for releasing phosphorus contained in the effluent of the primary sedimentation basin; An anaerobic ammonium oxidation reactor for removing ammonia nitrogen present in the effluent of the anaerobic tank using an anamax reaction; And a nitrite reaction tank for oxidizing the ammonia nitrogen-containing companion water generated in the sludge treatment process, the external high-concentration ammonia nitrogen-containing wastewater, or the ammonia nitrogen in the two to nitrite nitrogen. It includes, and the effluent discharged from the nitrite reaction tank is to be introduced into the anaerobic ammonium oxidation reaction tank, relates to a sewage treatment system.

According to an embodiment of the present invention, the anaerobic ammonium oxidation reactor may include an anamax microorganism cultured in the form of granules using a carrier or a gel.

According to an embodiment of the present invention, the external high-concentration ammonia-nitrogen-containing wastewater includes at least one selected from the group consisting of manure, livestock wastewater, drinking wastewater, leachate, and semiconductor waste, and occurs in the sludge treatment process. The companion water containing ammonia nitrogen may include at least one selected from the group consisting of an anaerobic digestion supernatant, a concentration tank supernatant, and a desorption filtrate.

According to an embodiment of the present invention, an oxygen-free tank after the anaerobic ammonium oxidation reaction tank; And an aerobic tank after the anoxic tank.

According to an embodiment of the present invention, the wastewater generated in the sludge treatment process may have a sludge reduction technology applied.

According to an embodiment of the present invention, the sewage may include one or more sewage and wastewater selected from the group consisting of sewage inflow sewage from a sewage treatment plant, wastewater from a sewage treatment plant sludge process, leachate, livestock manure, and manure.

According to an embodiment of the present invention, it may further include an aerobic reactor for removing organic matter before the anaerobic ammonium oxidation reactor.

The sewage treatment system of the present invention is eco-friendly and economical by applying the Anamox method to the water treatment process, and can treat nitrogen and phosphorus at the same time. In addition, it is possible to reduce the cost of sewage treatment and the pollutant load of the water treatment process by using reflow water containing a high concentration of ammonia nitrogen and external high concentration wastewater as a source of nitrite nitrogen flowing into the anaerobic oxidation reaction tank. In addition, it is possible to simultaneously satisfy the substrates required for the treatment of the high-concentration waste liquid and the Anamax reaction by using the reflow water containing a high-concentration ammonia nitrogen and the external high-concentration wastewater.

1 is a block diagram of a sewage treatment system according to the present invention, according to an embodiment of the present invention.
2 is a block diagram of a sewage treatment system according to the present invention, according to another embodiment of the present invention.
3 is a block diagram of a sewage treatment system according to the present invention, according to another embodiment of the present invention.
4 is a block diagram of a sewage treatment system further including an aerobic reactor prior to the anaerobic ammonium oxidation reactor according to the present invention, according to an embodiment of the present invention.
5 is a block diagram of a sewage treatment system further including a nitrite oxidation tank for converting and using ammonia nitrogen contained in the supernatant of the first settling basin according to the present invention according to an embodiment of the present invention. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms used in the present specification are terms used to properly express a preferred embodiment of the present invention, which may vary depending on the intention of users or operators, or customs in the field to which the present invention belongs. Therefore, definitions of these terms should be made based on the contents throughout the present specification. The same reference numerals shown in each drawing indicate the same members.

Throughout the specification, when a member is said to be positioned "on" another member, this includes not only the case where a member is in contact with the other member, but also the case where another member exists between the two members.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components.

Hereinafter, a sewage treatment system based on an anaerobic ammonium oxidation method in the sewage treatment plant water treatment process of the present invention will be described in detail with reference to Examples and drawings. However, the present invention is not limited to these examples and drawings.

According to an embodiment of the present invention, a sewage treatment system according to the present invention will be described with reference to FIG. 1, and FIG. 1 is a configuration diagram of a sewage treatment system according to the present invention according to an embodiment of the present invention. In FIG. 1, an anaerobic ammonium oxidation reactor 102 of a water treatment process (mainstream, mainstream) into which sewage containing ammonia nitrogen is introduced; And ammonia nitrogen-containing companion water, external high concentration ammonia-nitrogen-containing wastewater, or a nitrous oxidation reaction tank 200 for oxidizing the ammonia nitrogen in the two to nitrite nitrogen; Including, the effluent discharged from the nitrite reaction tank is It provides a sewage treatment system that is introduced into the anaerobic ammonium oxidation reaction tank (102).

The water treatment process (mainstream) used in this specification is a combination of several treatment facilities such as a primary settling basin, a biological reaction tank, and a secondary settling basin, and the combination and arrangement of each treatment facility takes into account the various conditions of the treatment plant. Is determined. The water treatment process is a concept that is distinct from the sludge treatment process (side stream) of the sewage treatment process.

In the anaerobic ammonium oxidation reactor 102, an anaerobic ammonium oxidation (ANAMMOX) reaction using ANAMMOX bacteria is performed.

The anaerobic ammonium oxidation (ANAMMOX) used herein refers to a reaction in which ammonium is oxidized and converted into nitrogen gas using ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor under anaerobic conditions. .

Examples of anamox bacteria used in anaerobic ammonium oxidation are Candidatus Brocadia sinica , Kuenenia spp , Brocadia anammoxidans , Kuenenia stuttgartiensis, and Candidatus Jettenia caeni . Due to the characteristics of slow-growing Anamox bacteria, it is preferable to maintain a long solid retention time (SRT) so that the Anamox bacteria can stay in the reaction tank for a long time. Hydraulic retention time (HRT) can be operated with a short HRT to increase the nitrogen load. The range of HRT may be 0.06d to 11d, but is not limited thereto. The ratio of ammonia nitrogen and nitrite nitrogen required for the anaerobic ammonium oxidation reaction is 1:1.32 according to Equation 1 below, but is not limited thereto, and is preferably in the range of 1:0.5 to 1:1.5. The pH of the anaerobic ammonium oxidation reactor is preferably 6.7 to 8, and the Alkalinity/Ammonium nitrogen ratio is 8 or less.Since Anamox bacteria are anaerobic bacteria, the concentration of dissolved oxygen (DO) should be maintained at 0.06 mg/L or less. desirable.

[Equation 1]

In the anaerobic ammonium oxidation reaction tank 102, the bacteria of Anamoxa are very vulnerable and sensitive to the external environment, so stabilization through mass cultivation is required, and in the form of granules or two using a carrier (Media) or a gel (gel). Anamoxa bacteria can be cultured and an Anamoxa reaction tank can be constructed.

The nitrite reaction tank 200 supplies nitrite nitrogen required for the anamax reaction in the anaerobic ammonium oxidation reaction tank 102, and the nitrite reaction tank 200 includes reflow water containing a high concentration of ammonia nitrogen, external Ammonia nitrogen is oxidized to nitrous nitrogen in wastewater containing high concentration ammonia nitrogen or in both, and the effluent discharged from the nitrite reaction tank 200 flows into the anaerobic ammonium oxidation reaction tank 102 of the water treatment process, and nitrite nitrogen is supplied. do. That is, the nitrite reaction tank 200 satisfies the substrate required for the Anamax reaction with a stable supply of nitrite nitrogen required for the Anamax reaction, and at the same time treats companion water and external wastewater containing high concentration ammonia nitrogen. It can provide economic benefits on process efficiency and process operation. In addition, it is possible to simultaneously supply ammonia nitrogen and nitrite nitrogen required for the Anamax reaction by nitrite oxidation of only the inflow sewage without supply of external nitrite nitrogen.

The ammonia nitrogen-containing companion water is an ammonia nitrogen-containing companion water generated in a sludge treatment process, and may include at least one selected from the group consisting of an anaerobic digestion supernatant, a concentration tank supernatant, and a desorption filtrate.

The external high concentration ammonia nitrogen-containing wastewater may include at least one selected from the group consisting of manure, livestock wastewater, drinking wastewater, leachate, and semiconductor wastewater.

In order to induce the nitrite reaction of the companion water and the external wastewater flowing into the nitrite reaction tank 200, the dominance of ammonium oxidizing bacteria (AOB) is induced through an artificial operation, and the nitrite oxidizing bacteria ( NOB, Nitrite Oxidizing Bacteria) is required to inhibit the population and activity. Two methods are proposed to induce the nitrite reaction of the companion water and external wastewater.

First, a method of inducing dominance of AOB through NOB wash-out is to use the difference in growth rate between AOB and NOB. Above a certain temperature (above about 30℃), the growth rate of AOB is about twice as fast as that of NOB. Using this, the solid retention time (SRT) can be operated as short as about 1 to 2 days to wash-out NOB.

Second, there is a method of inducing the accumulation of nitrite nitrogen through the regulation of FA (free ammonia) and FNA (free nitrous acid). In this case, FA and FNA can be expressed as a function of temperature, pH, ammonia nitrogen and nitrite nitrogen. When FA is 1.0 mg/L to 150 mg/L and FNA is 2.8 mg/L or less, NOB is inhibited and nitrite reaction is induced. In general, in the nitrification reaction, it is preferable to maintain a pH of 7 to 8 and a temperature of 30° C. to 35° C. and a concentration of ammonia nitrogen of 150 mg/L or more.

The amount of ammonia nitrogen converted through the nitrite oxidation reaction in the nitrite reaction tank 200 may be adjusted by the driver from 1% to 100% depending on the load of the ammonia nitrogen in the inflow sewage. The nitrite oxidation rate (e) in the nitrite reaction tank 200 is 100% or less; Or 50% to 100%.

The effluent water discharged from the nitrite reaction tank 200 includes companion water and external wastewater in which the nitrous oxidation reaction proceeds in the nitrite reaction tank 200, and the nitrite required for the anaerobic ammonium oxidation reaction in the anaerobic ammonium oxidation reaction tank 102 Supply nitrogen.

According to another embodiment of the present invention, a sewage treatment system according to the present invention will be described with reference to FIGS. 2 and 3, and FIGS. 2 and 3 are, according to another embodiment of the present invention, according to the present invention. It is a block diagram of the sewage treatment system by In Figure 2, the primary sedimentation basin 100 for inflow and precipitation of sewage; An anaerobic tank 101 for discharging phosphorus contained in the effluent water of the primary sedimentation basin; An anaerobic ammonium oxidation reactor 102 for removing ammonia nitrogen present in the effluent of the anaerobic tank using an anamox reaction; And a nitrite reaction tank 200 for oxidizing ammonia nitrogen-containing companion water, external high-concentration ammonia nitrogen-containing wastewater, or ammonia nitrogen in the two to nitrite nitrogen. Including, and the effluent water discharged from the nitrite reaction tank is introduced into the anaerobic ammonium oxidation reaction tank 102, a sewage treatment system is provided.

In the case of the anaerobic tank coming before the anaerobic ammonium oxidation reaction tank in the sewage treatment system, when mixed liquor suspended solid (MLSS) in the anaerobic tank flows into the anaerobic ammonium oxidation reaction tank, there is a possibility of affecting the Anamox bacteria. Therefore, if the MLSS of the anaerobic tank affects the efficiency of the anaerobic ammonium oxidation reaction tank and the securing of Anamox bacteria, the anaerobic tank can be excluded, and at this time, the sludge transfer position can be changed.

The sewage treatment system of the present invention is based on the concentration of nitrite nitrogen in the companion water and external wastewater flowing into the nitrite reaction tank.1) Inflow sewage than the load of nitrite nitrogen that can be supplied through the nitrite reaction of companion water and external wastewater. When the load of internal ammonia nitrogen is high (Fig. 2) and 2) When the load of nitrite nitrogen that can be supplied through the nitrite reaction of companion water and external wastewater is higher than the load of ammonia nitrogen contained in the incoming sewage ( It is divided into 3).

Referring to FIG. 2, when the concentration of nitrite nitrogen in the companion water and external wastewater flowing into the nitrite reaction tank is lower than the concentration of ammonia nitrogen in the incoming sewage, it is not possible to supply sufficient nitrite nitrogen for the anaerobic ammonium oxidation reaction, The flow rate flowing from the anaerobic tank 101 to the anaerobic ammonium oxidation reaction tank 102 is adjusted according to the concentration of nitrite nitrogen generated through the nitrite reaction of companion water and external wastewater. Therefore, the anaerobic tank effluent containing ammonia nitrogen that cannot be removed through the anaerobic ammonium oxidation reaction flows into the anoxic tank 103 by the amount of Q. The ammonia nitrogen remaining in the effluent of the anaerobic tank goes through the anoxic tank 103 and the aerobic tank 104 and additionally removed through nitrification-denitrification, and the nitrate nitrogen generated through the anaerobic ammonium oxidation reaction is also an oxygen free tank 103 and an aerobic tank ( 104) and reduced to nitrogen. In the aerobic tank 104, organic matter remaining in the sewage is additionally removed.

Referring to FIG. 3, when the concentration of nitrite nitrogen in the incoming companion water and external wastewater is higher than the concentration of ammonia nitrogen contained in the sewage into which the concentration of ammonia nitrogen is introduced, unlike FIG. 2, there is no anoxic tank and no anaerobic ammonium oxidation. After the reaction tank 102, an aerobic tank 104 for removing organic matter remaining in sewage is positioned. Since the nitrite nitrogen present in the companion water and the external wastewater is sufficiently present to perform an anaerobic ammonium oxidation reaction with the ammonia nitrogen of the incoming sewage, the flow flowing into the anaerobic ammonium oxidation reactor 102 can be selectively controlled.

Sewage flowing into the secondary sedimentation basin 105 through the aerobic tank 104 is returned to the anaerobic tank 101 through the conveying unit 106, and additional phosphorus can be removed by luxury uptake.

According to another embodiment of the present invention, the sewage treatment system according to the present invention is described with reference to FIG. 4, and FIG. 4 is, according to an embodiment of the present invention, before the anaerobic ammonium oxidation reactor according to the present invention. It is a block diagram of a sewage treatment system further including an aerobic reactor.

In FIG. 4, before the anaerobic ammonium oxidation reaction tank 102, an aerobic reaction tank 107 for an organic matter removal process; it is a sewage treatment system that further includes. Even if organic matter is removed from the aerobic reactor 107, Anamox bacteria do not affect the anaerobic ammonium oxidation reaction because they utilize inorganic carbon sources, and inhibit the activity of denitrifying bacteria competing with Anamox bacteria for nitrite nitrogen. You can get the effect. However, the loss of ammonia nitrogen required for the anaerobic ammonium oxidation reaction should be reduced by minimizing the oxidation of ammonia nitrogen.

According to another embodiment of the present invention, the sewage treatment system according to the present invention is described with reference to FIG. 5, and FIG. 5 is, according to an embodiment of the present invention, contained in the supernatant of the first settling basin according to the present invention. It is a configuration diagram of a sewage treatment system that further includes a nitrite oxidation tank to convert the ammonia nitrogen to nitrite nitrogen and use it.

In Figure 5, the primary sedimentation basin 100 for inflow and precipitation of sewage; An anaerobic tank 101 for discharging phosphorus contained in the effluent water of the primary sedimentation basin; A nitrite oxidation tank 108 for converting ammonia nitrogen in the supernatant of the first settling basin to nitrite nitrogen; An anaerobic ammonium oxidation reaction tank 102 for removing ammonia nitrogen in the effluent water of the nitrite oxidation tank 108; And a nitrite reaction tank 200 for oxidizing ammonia nitrogen-containing companion water, external high concentration ammonia nitrogen-containing wastewater, or ammonia nitrogen in the two to nitrite nitrogen, and the effluent discharged from the nitrite reaction tank is anaerobic. It provides a sewage treatment system that is introduced into the ammonium oxidation reaction tank (102).

The effluent water discharged from the nitrite reaction tank 200 may be introduced into the anaerobic ammonium oxidation reaction tank 102. When the load of nitrite nitrogen that can be supplied from the nitrite reaction tank 200 is less than the amount required for the anaerobic ammonium oxidation reaction, the nitrite tank 108 is used to convert the ammonia nitrogen in the incoming sewage into some nitrite nitrogen. Can be installed.

In the system of FIG. 5, a nitrite reaction is applied directly to the inflow sewage, primary sedimentation effluent, a mixture of incoming sewage and sludge process waste, and a mixture of primary sedimentation effluent and sludge process waste. Therefore, the ammonia nitrogen contained in the supernatant of the first settling basin is converted to nitrite nitrogen through nitrite oxidation reaction, and the sewage in which ammonia nitrogen and nitrite nitrogen are mixed in a ratio of 1:0.5 to 1:1.5 is anaerobic ammonium oxidation reaction. It is used for

According to one side, after the anaerobic ammonium oxidation reaction tank 102, an oxygen-free tank 103; may be further included. In the anoxic tank, the nitric oxide produced through the anaerobic ammonium oxidation reaction is denitrified, and organic substances that have not yet been removed in the anaerobic tank are removed.

According to one side, after the anoxic tank 103, an aerobic tank 104; may be further included. In the aerobic tank, ammonia nitrogen remaining in the sewage is converted into nitrate oxide, and a reaction in which organic matter and remaining phosphorus are removed proceeds.

According to one side, before the anaerobic ammonium oxidation reaction tank 102, an aerobic reaction tank 107 for the organic matter removal process; may be further included. Even if organic matter is removed from the aerobic reactor 107, Anamox bacteria do not affect the anaerobic ammonium oxidation reaction because they utilize inorganic carbon sources, and inhibit the activity of denitrifying bacteria competing with Anamox bacteria for nitrite nitrogen. You can get the effect. However, the loss of ammonia nitrogen required for the anaerobic ammonium oxidation reaction should be reduced by minimizing the oxidation of ammonia nitrogen.

According to one side, the wastewater generated in the sludge treatment process may have a sludge reduction technology applied. When nitrite nitrogen required for anaerobic ammonium oxidation reaction is not secured due to the low concentration of ammonia nitrogen in wastewater generated from the sludge treatment process, sludge reduction technology is used to cause cell destruction of the microorganisms constituting the sludge particles. It is possible to increase the concentration of nitrogen components such as organic nitrogen and ammonia nitrogen. Examples of sludge reduction techniques include ozone, crushing, ultrasonic waves, high-temperature digestion, high-temperature aerobic digestion, and microbubbles, but are not limited thereto.

The sewage to which the sewage treatment system of the present invention is applied may be one or more sewage and wastewater selected from the group consisting of sewage treatment plant inflow sewage, sewage treatment plant sludge process waste, leachate, livestock manure and manure, or a combination thereof, but are limited thereto. no.

Hereinafter, the present invention will be described in more detail through examples. The following examples are described for the purpose of illustrating the present invention, and the scope of the present invention is not limited thereto.

Example

1. Primary precipitation process

Sewage from the sewage treatment plant (flow rate or treatment capacity value) was introduced into the primary sedimentation pond to precipitate suspended solids in the sewage, and then discharged to the anaerobic tank.

2. Anaerobic process

Phosphorus (P) is released by phosphorus accumulating organisms (PAOs), and organic matter contained in the effluent of the primary sedimentation basin is removed.

3. Nitrous oxidation reaction process

Additional sludge reduction technology can be applied depending on the nitrogen concentration present in the companion water and external high-concentration wastewater. For the anaerobic ammonium oxidation process, all ammonia nitrogen existing in the reflux water and the external high-concentration wastewater is converted into nitrite nitrogen and introduced into the anaerobic ammonium oxidation reactor. The nitrite reaction controls FA (Free ammonia) and FNA (Free nitrous acid) to inhibit the activity of nitrite oxidizing bacteria (NOB) and induce dominance of ammonium oxidizing bacteria (AOB). Method was used. In the conditions of pH 7 to 8, temperature 30°C to 35°C, FA concentration is in the range of 1.0 mg/L to 150 mg/L, FNA concentration is 2.8 mg/L or less, and ammonia nitrogen concentration in nitrite reaction tank Maintained 150mg/L.

4. Anaerobic ammonium oxidation process

Together with the effluent from the anaerobic tank and the effluent from the nitrite reaction tank, they are introduced into the anaerobic ammonium oxidation reaction tank. When effluent and wastewater are mixed, the ratio of ammonia nitrogen and nitrite nitrogen present in the mixture is 1:0.5 to 1:1.5. The anaerobic ammonium oxidation reactor includes an Anamax reactor cultured in a granule form using a carrier and a gel.

On the other hand, the amount of sewage that moves to the anoxic tank without flowing into the anaerobic oxidation reactor is determined according to the concentration of nitrite nitrogen in the wastewater used (Q value).

In the anaerobic ammonium oxidation reactor, the nitrogen present in the sewage is removed using the Anamox bacteria.

5. Anoxic process

Nitrogen oxides produced through the anaerobic ammonium oxidation reaction are denitrified, and organic substances that have not yet been removed in the anaerobic tank are removed.

6. Aerobic tank process

Ammonia nitrogen present in the sewage (Q) flowing from the anaerobic tank through the anoxic tank to the aerobic tank is converted to nitrate oxide, and organic matter and remaining phosphorus present in the sewage discharged from the anoxic tank are removed.

7. Second precipitation process

In the secondary sedimentation basin, the remaining nitrogen oxides are denitrified, and the sewage is returned to the anaerobic tank through the conveying section, and phosphorus can be additionally removed by luxury uptake.

In the present invention, by incorporating an anamox anaerobic ammonium oxidation reactor and a nitrous oxidation-based method, the consumption of oxygen and organic carbon sources can be innovatively reduced compared to the nitrogen treatment process of an existing sewage treatment plant, and economic advantages can be provided. In addition, the present invention not only treats reflux water, which is a high-concentration waste liquid generated in the sludge treatment process, and associated treated water (manure, livestock wastewater, leachate, food wastewater, etc.), but also nitrite in anamox anaerobic ammonium oxidation in the main treatment process. It can be used as a source of nitrite nitrogen that stably supplies nitrogen.

As described above, although the embodiments have been described by the limited embodiments and drawings, various modifications and variations are possible from the above description to those of ordinary skill in the art. For example, even if the described techniques are performed in a different order from the described method, and/or the described components are combined or combined in a form different from the described method, or are replaced or substituted by other components or equivalents. Appropriate results can be achieved. Therefore, other implementations, other embodiments, and those equivalent to the claims also fall within the scope of the claims to be described later.

100: primary settling basin
101: anaerobic tank
102: anaerobic ammonium oxidation reactor
103: anoxic tank
104: Hogijo
105: secondary settling basin
106: conveying unit
107: exhalation reactor
108: nitrous oxidation tank
200: nitrite reaction tank

Claims (5)

Anaerobic ammonium oxidation reactor of a water treatment process (mainstream) in which sewage containing ammonia nitrogen is introduced; And a nitrite reactor for oxidizing ammonia nitrogen-containing companion water generated in the sludge treatment process, external high-concentration ammonia nitrogen-containing wastewater, or ammonia nitrogen in the two to nitrite nitrogen.
Including,
The effluent water discharged from the nitrite reaction tank is introduced into an anaerobic ammonium oxidation reaction tank of a water treatment process, and the anaerobic ammonium oxidation reaction tank removes ammonia nitrogen using an anamax reaction,
Sewage treatment system.
A primary sedimentation basin in which sewage is introduced and settled;
An anaerobic tank for releasing phosphorus contained in the effluent of the primary sedimentation basin;
An anaerobic ammonium oxidation reactor for removing ammonia nitrogen present in the effluent of the anaerobic tank using an anamax reaction; And
A nitrite reaction tank for oxidizing ammonia nitrogen-containing companion water generated in the sludge treatment process, external high-concentration ammonia nitrogen-containing wastewater, or ammonia nitrogen in the two to nitrite nitrogen; Including,
The effluent water discharged from the nitrite reaction tank is introduced into the anaerobic ammonium oxidation reaction tank,
Sewage treatment system.
The method according to claim 1 or 2,
The anaerobic ammonium oxidation reaction tank contains the Anamax microorganism cultured in the form of granules by a carrier or gel
Sewage treatment system.
The method according to claim 1 or 2,
The external high-concentration ammonia-nitrogen-containing wastewater includes at least one selected from the group consisting of manure, livestock wastewater, drinking wastewater, leachate, and semiconductor wastewater,
Companion water containing ammonia nitrogen generated in the sludge treatment process includes at least one selected from the group consisting of anaerobic digestion supernatant, concentration tank supernatant, and desorption filtrate,
Sewage treatment system.
The method according to claim 1 or 2,
An anoxic tank after the anaerobic ammonium oxidation reaction tank; And an aerobic tank after the anoxic tank; further comprising,
Sewage treatment system.

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