Upflow-type partial denitrification / anammox apparatus using three types of media

Abstract

Disclosed is an upflow-type partial denitrification / anammox apparatus using three types of filter media. According to one aspect of the present embodiment, the present invention relates to a partial denitrification / anammox apparatus for removing ammoniacal nitrogen, nitrate nitrogen, and organic substances in sewage / wastewater, the partial denitrification / anammox apparatus comprising: a first filter medium part for denitrifying nitrate nitrogen; a second filter medium part for denitrifying ammoniacal nitrogen by using anammox microorganisms; and a third filter medium part for oxidizing residual ammoniacal nitrogen and nitrite nitrogen.

Description

Upflow partial denitrification / anaerobic ammonium oxidation device using three types of filter media

[0001] This embodiment relates to an upward partial denitrification and anaerobic ammonium oxidation device configured using three types of media having different specific gravity, size, and pore space.

[0002] The content described in this section merely provides background information for the present embodiment and does not constitute prior art.

[0003] The first method of removing nitrogen from wastewater is a continuous process of nitrification, which oxidizes ammonia to nitrate, and denitrification, which converts nitrate to nitrogen gas.

[0004] Nitrification process:

[0005] Denitrification process:

[0006] These processes require high energy input for oxygen supply and external carbon source supply for denitrification.

[0007] To address these issues, new processes such as PN-A or PdN-A, which combine partial nitrification (PN) or partial denitrification (PdN) with anaerobic ammonium oxidation (Anammox), have been attracting attention as alternative technologies in recent years.

[0008] The partial nitrification process (PN) focuses on the process of partially oxidizing 57% of the ammonia nitrogen in raw water into nitrite nitrogen (NO2-N) using ammonium oxidation bacteria (AOB) rather than completely oxidizing it into nitrate nitrogen (NO3-N).

[0009] This partial nitrification process goes through the following process and is combined with an anaerobic ammonium oxidation process (Anammox), which has the advantage of reducing the energy required for air supply by approximately 60% compared to the existing complete nitrification-denitrification process and eliminating the need for an external carbon source for denitrification.

[0010] Partial nitrification process:

[0011] Anaerobic ammonium oxidation process:

[0012] Meanwhile, the partial denitrification process goes through the following process to produce nitrite nitrogen (NO2-N) required for the reaction of the anaerobic ammonium oxidation process, and nitrate (NO3 - ) to nitrite (NO2 - ) is converted to. The partial denitrification process can also be applied in combination with the anaerobic ammonium oxidation process (Anammox), and has the advantage of reducing the energy required for oxygen supply by approximately 50% and the input of external carbon sources required for denitrification by up to 80% compared to the existing nitrification-denitrification process.

[0013] Partial denitrification process:

[0014] Anaerobic ammonium oxidation process:

[0015] However, when introducing the partial nitrification process / anaerobic ammonium oxidation process (PN / AMX) to the main treatment process, it is difficult to control nitrite oxidizing bacteria (NOB) due to low ammonia concentration, low temperature, flow rate, and water quality fluctuations, so there are still difficulties in field application.

[0016] Meanwhile, the partial denitrification process / anaerobic ammonium oxidation process (PdN / AMX) is less affected by temperature and can adapt to fluctuations in water quality and flow rate, and its application in actual treatment plants has been reported. In particular, the PdN / AMX process is known to be capable of treating nitrogen at low concentrations when applied as a tertiary treatment process.

[0017] However, in the partial denitrification process / anaerobic ammonium oxidation process (PdN / AMX), it has been reported that if the C / N ratio and the NO2-N / NH4-N ratio are not precisely controlled, the concentrations of NO2-N and NH4-N in the treated water increase. Therefore, in order to secure stable water quality in the partial denitrification process / anaerobic ammonium oxidation process, it is necessary to add a separate polishing process at the later stage.

[0018] In this way, when each process is used independently, each of the aforementioned inconveniences exists.

[0019] One embodiment of the present invention aims to provide a partial denitrification / anaerobic ammonium oxidation device capable of actively coping with flow rate and load fluctuations by simultaneously performing a partial denitrification process, an anaerobic ammonium oxidation process, and an aerobic nitrification process in one reactor, and maximizing the amount of anaerobic ammonium oxidation microorganisms while maintaining an appropriate amount of denitrification and nitrification microorganisms.

[0020] According to one aspect of the present embodiment, a partial denitrification / anaerobic ammonium oxidation device for removing ammonia nitrogen, nitrate nitrogen, and organic matter in incoming wastewater is provided, the device comprising: a first filter medium for denitrifying nitrate nitrogen in the incoming wastewater by attaching and growing denitrifying microorganisms; a second filter medium for denitrifying ammonia nitrogen in the incoming wastewater by attaching and growing anaerobic ammonium oxidation (Anammox) microorganisms; a third filter medium for oxidizing unremoved ammonia nitrogen and nitrite nitrogen by attaching and growing nitrifying microorganisms; and an air diffuser for supplying oxygen to the third filter medium, the third filter medium being disposed on the second filter medium in the direction of the inflow of wastewater.

[0021] According to one aspect of the present embodiment, the partial denitrification / anaerobic ammonium oxidation device is characterized in that it receives wastewater, backwash water, and backwash air in priority at the bottom, and further includes a filter expansion counter space that provides a space that can be located when the volume of the first filter section expands.

[0022] According to one aspect of the present embodiment, the expansion space for the filter is characterized in that it is implemented with a volume of 10 to 20% of the volume of the first filter section.

[0023] According to one aspect of the present embodiment, the second filter section is characterized in that it includes a filter material having the smallest size, specific gravity, and void among all the filter materials in the filter sections.

[0024] According to one aspect of the present embodiment, the partial denitrification / anaerobic ammonium oxidation device is characterized in that it further includes a second screen that is disposed on the second filter section in the direction in which wastewater flows in and prevents discharge of the filter material in the second filter section.

[0025] According to one aspect of the present embodiment, the second screen is characterized in that it prevents discharge of the filter medium in the second filter medium section and discharges the treated water in the second filter medium section.

[0026] According to one aspect of the present embodiment, the second screen is characterized in that air is injected from the upper portion of the second filtering section and oxygen dissolved in water is prevented from flowing into the second filtering section.

[0027] According to one aspect of the present embodiment, the scattering device is characterized in that it is arranged at a distance from the second filter part that is greater than a preset distance.

[0028] According to one aspect of the present embodiment, the preset interval is characterized by being 30 cm.

[0029] According to one aspect of the present embodiment, the partial denitrification / anaerobic ammonium oxidation device is characterized in that it further includes a third screen that is arranged above the third filter section in the direction in which wastewater flows in, prevents outflow of the filter material within the third filter section, and discharges the treated water to the outside.

[0030] As described above, according to one aspect of the present embodiment, by simultaneously performing a partial denitrification process, an anaerobic ammonium oxidation process, and an aerobic nitrogen oxidation process in one reactor, it is possible to actively cope with changes in flow rate and pollutant load, and there is an advantage in that the amount of anaerobic ammonium oxidation microorganisms can be maximized while maintaining an appropriate amount of denitrification and nitrification microorganisms.

[0031] FIG. 1 is a diagram illustrating the configuration of a partial denitrification / anaerobic ammonium oxidation device according to one embodiment of the present invention.

[0032] FIG. 2 is a drawing illustrating the configuration of a third screen according to one embodiment of the present invention.

[0033] FIG. 3 is a diagram illustrating the amount of each component in the influent to a partial denitrification / anaerobic ammonium oxidation device according to one embodiment of the present invention and in the treated water that has passed through each filter medium.

[0034] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Throughout the description of each drawing, similar reference numerals have been used to designate similar components.

[0035] Terms such as first, second, A, and B may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term "and / or" includes a combination of multiple related items described herein or any of multiple related items described herein.

[0036] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0037] The terminology used in this application is solely for the purpose of describing specific embodiments and is not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. It should be understood that terms such as "comprise" or "have" in this application do not preclude the presence or possibility of addition of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification.

[0038] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0039] Terms defined in commonly used dictionaries should be interpreted to have a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

[0040] In addition, each configuration, process, procedure or method included in each embodiment of the present invention may be shared within a scope that is not technically inconsistent with each other.

[0041] FIG. 1 is a diagram illustrating a configuration of a partial denitrification / anaerobic ammonium oxidation device according to one embodiment of the present invention, and FIG. 3 is a diagram illustrating the amounts of each component in treated water that has passed through each filter medium in a partial denitrification / anaerobic ammonium oxidation device according to one embodiment of the present invention.

[0042] Referring to FIG. 1, a partial denitrification / anaerobic ammonium oxidation device (100, hereinafter abbreviated as “device”) according to one embodiment of the present invention includes a first screen (110), a filter expansion preparation space (120), a first filter section (130), a second filter section (140), a second screen (150), a third screen (155), an air diffuser (160), and a third filter section (170).

[0043] The device (100) receives wastewater that has been primarily treated externally, and internally removes ammonia nitrogen (NH4-N), nitrate nitrogen (NO3-N), and organic substances (COD) below the allowable discharge standards. For example, the device (100) can be introduced at the rear end of a conventional biological reactor, receives wastewater that has passed through the biological reactor, and additionally removes nitrogen components remaining in the wastewater. The device (100) allows the introduced wastewater to flow upward, and passes it through three filter media having different specific gravity, size, and pores, thereby removing the aforementioned components below the standards.

[0044] The first screen (110) is placed at the bottom of the device (100) to receive wastewater with priority and prevent the first filter (130) from being discharged to the bottom of the device (100) during the reverse filtration process.

[0045] Accordingly, the first screen (110) is formed with a mesh structure that blocks the passage of the filter medium in the first filter section (130) but allows the passage of wastewater. In particular, it is preferable that the first screen (110) has a structure that has low pressure loss and is not easily clogged, and therefore, the screen section of the first screen (110) does not need to be formed with an excessively fine mesh structure. If the screen section is excessively dense, a problem may arise in which the inflow of inflow water and the discharge of backwash water are not smooth.

[0046] The filter expansion counter space (120) is located above the first screen (110) and is formed between the first screen (110) and the first filter section (130). This space receives wastewater and backwash water that have passed through the first screen (110), as well as backwash air, and provides a space in which the filter media of the first filter section (130) can flow when they expand during the backwash process. Since the first filter section (130) has the characteristics described below, the filter expansion counter space (120) can be implemented with a volume of 10 to 20% of the volume of the first filter section (130).

[0047] The first filter unit (130) attaches and grows denitrifying microorganisms to partially denitrify nitrate nitrogen in the introduced wastewater.

[0048] The first filter unit (130) attaches and grows partial denitrifying microorganisms that perform partial denitrification, and performs partial denitrification using the introduced nitrate nitrogen and organic matter. As illustrated in Fig. 3, wastewater containing relatively high concentrations of ammonia nitrogen, nitrate nitrogen, and organic matter, which has first passed through a biological reactor or the like from the outside, is introduced into the first filter unit (130). In order to prevent complete denitrification requiring an excessive amount of energy source from occurring in the first filter unit (130), the wastewater introduced into the device (100) is maintained at a low C / N ratio of about 2 to 3, and is made to contain organic matter (carbon source) that is advantageous for partial denitrification, such as acetate and glycerol.

[0049] The first filter unit (130) converts nitrate nitrogen in the introduced wastewater into nitrite nitrogen by performing the partial denitrification process mentioned above (technology that forms the background of the invention) using partial denitrification microorganisms. Referring to Fig. 3, it can be confirmed that the concentration of nitrate nitrogen in the wastewater significantly decreases after passing through the first filter unit (130), and accordingly, the concentration of nitrite nitrogen increases.

[0050] In addition, the first filter section (130) is positioned in front of the second filter section (140) based on the direction of inflow of wastewater, so that the C / N ratio and NO2 / NH4 ratio of the wastewater can be controlled so that the anaerobic ammonium oxidation process of the second filter section (140), which will be described later, can occur stably.

[0051] The first filter section (130) is located at the lowest layer of the device (100) together with the filter expansion preparation space (120). The filter included in the first filter section (130) has a preset size, and in particular, has the largest size among the filter sections included in the device (100). Here, the preset size may be in the range of 30 to 100 mm. If the size of the filter within the first filter section (130) is smaller than this, the mesh spacing of the first screen (110) installed to prevent the filter within the first filter section (130) from leaking must also be configured to be more dense than this, which may cause a problem in that the inflow of wastewater is not smooth. Therefore, the filter within the first filter section (130) has a preset size. Even if the wastewater flows upwards because the filter medium in the first filter section (130) has a preset size, the filter medium in the first filter section (130) rises only to the lower part of the second filter section (140) and is prevented from moving any further by the filter medium in the second filter section (140) which has the smallest specific gravity and size as will be described later. Therefore, the above-described operation can be performed simply by adjusting the sizes of the first filter section (130) and the second filter section (140) without a separate configuration for preventing the filter medium from moving upward from the first filter section (130).

[0052] The filter medium in the first filter section (130) has a preset specific gravity. Here, the preset specific gravity is 0.90 to 0.99 g / cm 3It may be. In order to remove nitrate nitrogen in wastewater flowing in an upward direction, it is advantageous for the specific gravity of the filter medium to be smaller than that of water and thus to float. However, if the specific gravity is excessively smaller than that of water, excessive energy may be consumed during backwashing, so the filter medium in the first filter medium section (130) has a specific gravity within the aforementioned range.

[0053] At this time, the denitrifying microorganisms attached to and growing on the first filter section (130) have a relatively high growth rate of 0.53 to 0.63 gCOD / gCOD. Accordingly, the amount of microorganisms attached to and growing on the filter section within the first filter section (130) rapidly increases.

[0054] As microorganisms grow, the specific gravity of the filter medium within the first filter section (130) increases, gradually reaching a level that is the same as or nearly the same as the specific gravity of water. Since the filter medium within the first filter section (130) floats only due to the upward flow, it is structurally very loosely packed. Since the filter medium within the first filter section (130) has a preset size and specific gravity, it has a relatively large porosity (0.8 to 0.9). The filter medium within the first filter section (130) can secure a large number of pores, thereby maximizing the retention of microorganisms and increasing the filtration duration.

[0055] Since the specific gravity of the filter medium within the first filter section (130) becomes equal to or similar to that of water over time, effective filter medium flow can be achieved with only a relatively small amount of backwash water and backwash air injected. Accordingly, the filter medium within the first filter section (130) can effectively detach microorganisms attached to it.

[0056] In the case of conventional floating biofilm filters with a specific gravity of 0.1 or less, the supply speeds of backwash water and backwash air for backwashing must be considerably high, such as 60 to 120 m / hr and 12 to 35 m / hr, respectively. On the other hand, since the filter media in the first filter section (130) has a specific gravity equal to or similar to that of water, sufficient backwashing effect can be achieved even when backwash water is supplied at a low velocity of 5.0 to 10 m / hr and backwash air is supplied at a velocity of 1.0 to 5.0 m / hr. Accordingly, the first filter section (130) can minimize energy consumption during backwashing.

[0057] In the case of conventional floating biofilm filters, the entire filter media must expand during backwashing. Therefore, backwash water must be supplied in a volume equal to the entire filter media volume, including the space for expansion. In conventional floating biofilm filters, the space for expansion occupied nearly 30% of the total filter media volume. Consequently, conventional floating biofilm filters consumed significantly more backwash water for backwashing.

[0058] On the other hand, the first filter section (130) is formed only in a portion of the lower portion of the second filter section (140) within the device (100), and the filter expansion space (120) is also implemented at about 10 to 20% of the volume of the first filter section (130). As a result, the amount of backwash water injected can be significantly reduced to about 30 to 50% compared to the amount of backwash water injected to backwash a conventional floating biofilm filter. Accordingly, the first filter section (130) can perform backwashing more efficiently and economically than in the past.

[0059] In addition, since the backwash amount is minimized to less than 1% of the treated water amount, which is lower than the backwash amount of 3 to 10% of the treated water amount used in the conventional method, the recovery rate of the treated water can be increased. Furthermore, since the first filter unit (130) can perform backwashing at a low backwash water and backwash air supply rate, the detachment of microorganisms attached to the second filter unit (140) can be minimized, and the anaerobic environment of the second filter unit (140) can be minimized from being inhibited by dissolved oxygen contained in the backwash air.

[0060] The second filter (140) is placed above the first filter (130) based on the direction of inflow of wastewater (upward flow), and denitrifies ammonia nitrogen in the inflowing wastewater by attaching and growing anaerobic ammonium oxidation (Anammox) microorganisms.

[0061] The filter medium in the second filter section (140) has the smallest size, specific gravity, and voids among all the filter mediums in the device (100). In particular, the filter medium in the second filter section (140) has a size (diameter) of 3 to 8 mm. Accordingly, the voids between the filter mediums in the second filter section (140) are also implemented to be the smallest. Since the size and voids of the filter medium in the second filter section (140) are implemented in this way, as described above, the filter medium in the first filter section (130) can be prevented from rising above a certain level when rising due to the inflow of wastewater or the injection of backwash water or backwash air.

[0062] The filter medium in the second filter section (140) is 0.09 to 0.1 g / cm 3 As a result, the filter medium in the second filter section (140) is packed with strong buoyancy, so that the detachment of attached microorganisms during filtration can be suppressed, thereby maximizing the concentration of microorganisms. In addition, since the filter medium in the second filter section (140) hardly expands during backwashing, the detachment of attached microorganisms due to backwashing can be minimized.

[0063] Since the filter medium in the second filter section (140) has the size, specific gravity, and pores described above, even if a large amount of denitrifying microorganisms growing in the filter medium in the first filter section (130) are detached, they can be removed through filtration, thereby enabling the device (100) to secure stable treated water quality.

[0064] The filter medium in the second filter section (140) attaches and grows anaerobic ammonium-oxidizing microorganisms, thereby denitrifying ammonia nitrogen in the introduced wastewater. The second filter section (140) has an anaerobic environment and attaches and grows anaerobic ammonium-oxidizing microorganisms. As described above in the background technology of the invention, the anaerobic ammonium-oxidizing microorganisms denitrify nitrogen components into nitrogen gas by using ammonia nitrogen and nitrite nitrogen without separate organic matter.

[0065] The influent flowing into the second filter unit (140) contains nitrite nitrogen generated while passing through the first filter unit (130) and residual ammonia nitrogen, so the second filter unit (140) performs a denitrification reaction using anaerobic ammonium oxidation microorganisms. Referring to Fig. 3, it can be confirmed that the concentration of ammonia nitrogen and nitrite nitrogen in the wastewater significantly decreases while passing through the second filter unit (140).

[0066] The second screen (150) is placed on the second filter medium section (140) based on the upward flow direction of the inflow of wastewater, thereby preventing the outflow of the filter medium within the second filter medium section (140) and discharging the treated water that has passed through the second filter medium section (140). In addition, the second screen (150) blocks dissolved oxygen generated when air is injected from the upper portion of the second filter medium section (140) from flowing into the second filter medium section (140), thereby maintaining the anaerobic environment of the second filter medium section (140).

[0067] The oxygen diffusion device (160) is placed on the top of the second filter section (140) or the second screen (150) and supplies oxygen to the third filter section (170). The oxygen diffusion device (160) supplies oxygen to the third filter section (170) to oxidize ammonia nitrogen and nitrite nitrogen present in the influent water flowing into the third filter section (160).

[0068] The oxygenation device (160) is positioned at a preset distance from the second filter section (140) or the second screen (150), more specifically, at a distance of 30 cm or more, so as to prevent the phenomenon of dissolved oxygen generated from the upper part due to turbulence being transferred to the second filter section (140).

[0069] The third filter section (170) is placed on the second filter section (140) based on the upward flow direction of the inflow of wastewater, and oxidizes untreated ammonia nitrogen and nitrite nitrogen by attaching and growing nitrifying microorganisms.

[0070] The third filter section (170) is located above the second filter section (140), and the filter material in the third filter section (170) has a preset size and specific gravity. The filter material in the third filter section (170) is smaller than the filter material in the first filter section (130) and larger than the filter material in the second filter section (140). The filter material in the third filter section (170) has a size of 10 to 30 mm and a corresponding gap.

[0071] Meanwhile, the specific gravity of the filter in the third filter section (170) is 0.91 to 1.3 g / cm 3 It is implemented as the heaviest. In particular, the filter medium in the third filter section (170) can be manufactured by impregnating a material such as zeolite to increase the specific gravity. As zeolite is impregnated in the filter medium in the third filter section (170), ammonia can be adsorbed using zeolite, thereby ensuring stable treated water quality. As the specific gravity of the filter medium in the third filter section (170) satisfies the conditions described above, when the air supply is cut off, sedimentation of the filter medium can be induced, thereby minimizing loss of the filter medium.

[0072] Meanwhile, the first filter section (130) and the second filter section (140) are structurally maintained in a fixed state even during the upward flow of wastewater during the filtration process. On the other hand, the third filter section (170) is continuously circulated by air supplied from the air distribution tube (160) during the filtration of wastewater, and as a result, nitrifying microorganisms attached to the filter within the third filter section (170) are detached.

[0073] Accordingly, unlike the first filter unit (130), the third filter unit (170) does not perform separate backwashing, and the detachment of microorganisms occurs due to continuous flow caused by air injection and friction between filter media. Since the detached microorganisms cannot be backwashed downwards, they are discharged evenly together with the treated water. If backwashing is performed intermittently, the concentration of solids in the treated water may increase due to the temporarily detached microorganisms. However, the third filter unit (170) can prevent the phenomenon in which the concentration of solids in the treated water temporarily increases rapidly due to the simultaneous detachment of microorganisms by continuously detaching the grown microorganisms. In particular, since the growth coefficient of nitrifying microorganisms is not high at 0.17 gCOD / gNH4-N (0.15 gVSS / gNH4-N), the concentration of solids in the treated water can be maintained at 10 mg / L or less even if continuous detachment of microorganisms occurs.

[0074] The filter medium in the third filter medium (170) receives oxygen from the diffusion tube (160) and attaches and grows nitrifying microorganisms, thereby oxidizing ammonia nitrogen and nitrite nitrogen into nitrate nitrogen. Even after passing through the first filter medium (130) and the second filter medium (140), a small amount of ammonia nitrogen or nitrite nitrogen may remain. Since ammonia nitrogen and nitrite nitrogen are relatively more toxic than nitrate nitrogen, if they are released into the water system as is, they cause adverse effects on fish and aquatic organisms. In particular, it is generally desirable for ammonia nitrogen to remain at 1.0 mg / L or less in the effluent, and it is ideal for nitrite nitrogen not to remain at all, but toxicity occurs even at the level of 0.75 mg / L, and serious toxicity can occur if it is 5.0 mg / L or more. Accordingly, the third oxidizer (170) oxidizes the corresponding components into nitric acid nitrogen.

[0075] According to the experimental results, it was confirmed that when air was injected into the third filter (170), ammonia nitrogen and nitrite nitrogen were effectively removed.

[0076] Referring to Figure 3, it can be confirmed that the concentrations of ammonia nitrogen and nitrite nitrogen in the treated water discharged through the third filter unit (170) are minimized, while a certain amount of nitrate nitrogen is included. In addition, it can be confirmed that the concentration of organic matter is significantly reduced compared to the influent water.

[0077] The third screen (155) is positioned above the third filter section (170) in the direction in which wastewater flows (upward flow), and prevents the outflow of the filter material within the third filter section (170) and discharges the treated water to the outside. The third screen (155) can be implemented as illustrated in Fig. 2.

[0078] FIG. 2 is a drawing illustrating the configuration of a third screen according to one embodiment of the present invention.

[0079] Referring to FIG. 2, a third screen (155) according to one embodiment of the present invention includes a frame (210), an exhaust portion (220), and a screen portion (230).

[0080] The frame (210) provides a space in which the discharge section (220) and the screen section (230) are implemented.

[0081] The discharge unit (220) is implemented at one position of the frame (210) and discharges the treated water that has passed through the screen unit (230) to the outside of the device (100).

[0082] The screen section (230) is implemented to be smaller than the filter medium in the third filter section (170), so that the treated water passes through but the filter medium is not discharged.

[0083] Accordingly, the device (100) can actively respond to flow rate and load fluctuations by simultaneously performing a partial denitrification process, an anaerobic ammonium oxidation process, and an aerobic nitrogen oxidation process within a single reactor. In addition, by maximizing the amount of anaerobic ammonium oxidation microorganisms while maintaining an appropriate amount of denitrification and nitrification microorganisms, a stable nitrogen removal process can be maintained.

[0084] The above description is merely an example of the technical idea of ​​the present embodiment, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical idea of ​​the present embodiment, but rather to explain it, and the scope of the technical idea of ​​the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be interpreted by the claims below, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of rights of the present embodiment.

[0085]

[0086] CROSS-REFERENCE TO RELATED APPLICATION

[0087]

[0088] *This patent application claims priority under 35 USC § 119(a) to Korean Patent Application No. 10-2024-0121215, filed in Korea on September 6, 2024, the entire contents of which are incorporated by reference herein. Furthermore, if this patent application claims priority in countries other than the United States for the same reasons, the entire contents of which are incorporated by reference herein.

Claims

1. In a partial denitrification / anaerobic ammonium oxidation device that removes ammonia nitrogen, nitrate nitrogen and organic substances in incoming wastewater, A first filter section that partially denitrifies nitrate nitrogen in the introduced wastewater by attaching and growing denitrifying microorganisms; A second filter section is arranged on the first filter section in the direction in which wastewater flows in, and attaches and grows anaerobic ammonium oxidation (Anammox) microorganisms to denitrify ammonia nitrogen in the flowing wastewater; A third filter section is placed on the second filter section in the direction in which wastewater flows in, and oxidizes unremoved ammonia nitrogen and nitrite nitrogen by allowing nitrifying microorganisms to attach and grow; and An oxygen supply pipe arranged on the upper part of the second filter section to supply oxygen to the third filter section A partial denitrification / anaerobic ammonium oxidation device characterized by including:

2. In paragraph 1, A partial denitrification / anaerobic ammonium oxidation device characterized in that it further includes a filter expansion preparation space located at the lower portion of the first filter section, receives wastewater, backwash water, and backwash air in priority to the first filter section, and provides a space that can be located when the volume of the first filter section expands.

3. In paragraph 2, The above-mentioned expansion space is, A partial denitrification / anaerobic ammonium oxidation device characterized in that it is implemented with a volume of 10 to 20% of the volume of the first filter section.

4. In paragraph 1, The above second section, A partial denitrification / anaerobic ammonium oxidation device characterized by including a filter medium having the smallest size, specific gravity and pore size among all filter mediums in the filter section.

5. In paragraph 1, A partial denitrification / anaerobic ammonium oxidation device characterized in that it further includes a second screen arranged on the second filter section in the direction in which wastewater flows in to prevent discharge of the filter material in the second filter section.

6. In paragraph 5, The second screen above is, A partial denitrification / anaerobic ammonium oxidation device characterized in that it prevents discharge of the filter medium in the second filter medium section and discharges the treated water in the second filter medium section.

7. In paragraph 5, The second screen above is, A partial denitrification / anaerobic ammonium oxidation device characterized in that air is injected from the upper portion of the second filter section to prevent oxygen dissolved in water from flowing into the second filter section.

8. In paragraph 1, The above-mentioned mountain organ, A partial denitrification / anaerobic ammonium oxidation device characterized in that it is arranged at a distance greater than a preset distance from the second filter section.

9. In paragraph 8, The above preset interval is, Partial denitrification / anaerobic ammonium oxidation device characterized by a 30 cm diameter.

10. In paragraph 1, A partial denitrification / anaerobic ammonium oxidation device characterized in that it further includes a third screen that is arranged on the upper side of the third filter section in the direction in which wastewater flows in to prevent the outflow of the filter material in the third filter section and to discharge the treated water to the outside.

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