KR100513429B1 - Treatment system and Nutrient Removal of Wastewater using Media Separator - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to a method for purifying nutrients in wastewater using a median separator and a treatment apparatus thereof. More particularly, the organic matter contained in the wastewater is provided as an organic carbon source for denitrification to remove nitrogen, thereby improving the purification efficiency of the organic matter. The present invention relates to a high concentration of nutrient-containing wastewater purification method and an apparatus for efficiently and economically operating by sequentially removing nitrogen and phosphorus by struvite (MgNH ₄ PO ₄ .6H ₂ O) crystallization.

I. The technical problem the invention is trying to solve.

Conventionally, physicochemical and biological purification methods have been used to remove nitrogen and phosphorus contained in sewage and wastewater. However, the physicochemical purification method has a large amount of chemicals, a large amount of waste sludge generated and a large amount of organic matter. There is a cost problem, and there is a lower problem than the biological purification in terms of stability of the purified water, and the biological purification method requires the aerobic and anaerobic process because the nitrification required in the aerobic condition and the denitrification required in the anoxic condition should proceed. If the concentration of nitrogen is high, such as industrial wastewater, the purification time by microorganism is very long, so the investment cost of initial equipment cost is big and the operating conditions to create the environment for microbial growth are difficult. Problem that requires skill There has been a problem in that an electron donor (organic material) necessary for denitrification must be separately supplied.

All. The gist of the solution of the invention.

By removing the organics from the influent wastewater by using the medium that microorganisms attached and growing, and removing nitrogen and phosphorus by using struvite crystallization, the organic matter contained in the wastewater is provided to the electron donor during the subsequent denitrification reaction. In order to simplify the device and reduce the cost, the microorganisms can be used to remove the remaining organic matter.

Description

Method for purifying nutrients in wastewater using median separator and treatment device {Treatment system and Nutrient Removal of Wastewater using Media Separator}

The present invention relates to a method for purifying nutrients in wastewater using a median separator and a treatment apparatus thereof. More particularly, the organic matter contained in the wastewater is provided as an organic carbon source for denitrification to remove nitrogen, thereby improving the purification efficiency of the organic matter. The present invention relates to a method for treating wastewater containing high concentrations of nutrients which can be efficiently and economically operated by sequentially removing nitrogen and phosphorus through struvite (MgNH ₄ PO ₄ · 6H ₂ O) crystallization and its treatment apparatus. will be.

In general, nitrogen and phosphorus contained in sewage and waste water cause eutrophication of rivers, deplete dissolved oxygen and act as toxic to aquatic organisms such as fish and cause odors, making it difficult to use as a constant. When it was introduced into the sea, it was a cause of red tide, and in severe cases, it was decayed at the bottom of the water, causing odor and water pollution, which required the removal of nitrogen and phosphorus from sewage and wastewater.

Conventionally, a physicochemical purification method and a biological purification method have been used together to remove nitrogen and phosphorus contained in sewage or wastewater.

As a physicochemical purification method for treating nitrogen or phosphorus, which are representative nutrients, ammonia degassing, ion exchange using selective adsorption, and precipitation using chemicals such as Alum (coagulant) are used. However, the physicochemical treatment method has the advantage that the purification treatment is selective and rapid, while in order to remove all organic matter, nitrogen and phosphorus, excessive chemical cost is consumed and the amount of waste sludge generated is high, which requires a large treatment cost. There was a problem that it is difficult to expect stable treated water quality.

Meanwhile, A / O, A ² / O, UCT, VIP, Bardenpho, etc. have been developed and widely applied as biological purification treatment methods. Since nitrification required in aerobic conditions and denitrification required in anoxic conditions must be carried out, aerobic and anaerobic requirements must be met, and when the concentration of nitrogen is high, such as industrial wastewater, the purification time by microorganisms is very long. As a result, the investment burden of the initial equipment cost is large, and the operating conditions for creating an environment necessary for the growth of microorganisms are difficult, requiring a skill for operation.

For example, when the pH is 7 at a temperature of 20 degrees Celsius, when the concentration of nitrogen in the wastewater is 300 mg / L, unionized free-ammonia is a microorganism involved in nitrification by maintaining 1.18 mg / L. Nitrobacter is in the range of 0.1-1.0mg / L reported to be inhibited, which is inhibited by growth, and the nitrification rate is very slow.In case of high nitrogen concentrations in wastewater such as livestock wastewater, microorganisms cause toxic damage. There was a problem that the biological purification of nitrogen is very difficult to receive.

On the other hand, for the denitrification of organic matter, there is a hassle to inject an electron donor with organic matter such as acetate or methanol.

In particular, in order to use the organic matter in the waste water for the denitrification reaction, the conventional flotation purification process has a disadvantage in that the facility is complicated by forming a sedimentation tank following the anaerobic reaction tank to separate the microorganism and the waste water. (Reference: Water Science and Technology, Vol 40, NO 4-5, 1999, UK, G.Bortone, S.M.Libelli, A.Tilche and J.Wanner, Anoxic Phosphate Uptake in the DEPHANOX Process, pp.177-186)

Therefore, in recent years, the development of sewage and wastewater purification methods for simultaneously removing organic matters and nutrients such as nitrogen and phosphorus by linking physicochemical and biological purification methods has been continuously attempted, and organic matter contained in wastewater It was required to develop a purification method that can be used as an electron donor.

The present invention has been made to solve the above problems, an object of the present invention is to combine the physicochemical wastewater purification treatment method and biological wastewater purification treatment method to quickly remove organic matter, nitrogen and phosphorus contained in sewage or wastewater. In order to provide a waste water purification method and treatment device that can be purified, stable and economical,

An object of the present invention is to lower the concentration by absorbing and adsorbing the organic matter in the wastewater introduced by using a fluid carrier (Media) that the microorganisms adhere to grow, remove nitrogen and phosphorus by using struvite crystallization and subsequently denitrification As the organic material absorbed and adsorbed to the fluid carrier during the reaction is provided as an electron donor, the device is simplified to reduce the cost and to improve the treatment efficiency by removing the remaining organic material by the respiration of microorganisms.

In order to achieve the above object, the present invention provides a method for purifying nutrients contained in wastewater, inducing the adsorption of organic matter in an anaerobic state by contacting the introduced wastewater with a medium, which is a fluid carrier that grows with microorganisms. Organic material adsorption step (100); and the median separation step (110) for separating the media adsorbed a certain amount of organic material while passing through the organic material adsorption step (100); and hydrogen in the wastewater after the organic material adsorption step (100) A struvite crystallization step (200) for removing nitrogen and phosphorus by injecting an ion concentration (pH) regulator and magnesium (Mg ⁺² ); and a predetermined amount of organic matter and nitrogen by passing through the struvite crystallization step (200) And nitric acid which induces nitrification reaction by contacting the media, which is a fluid carrier, in which microorganisms are attached and grow to remove nitrogen and phosphorus remaining in the wastewater introduced by phosphorus removal. Step 300 and the nitrification step 300 is mixed with the media separated in the media separation step 110 in the wastewater that occurs in the anaerobic state by using the organic material adsorbed on the media as an electron donor Denitrification step 400; and organic material decomposition step 500 which is followed by the denitrification step 400 and the organic matter remaining in the wastewater mixed with the organic material attached to the media is decomposed together; and the organic material decomposition step 500 A media recovery step 510 which separates the media from which the organic matter is removed and passes to the organic material adsorption step 100 while passing through the media; And the sludge conveying step 610 of passing through all the above steps to precipitate and remove the suspended matter and some desorbed microorganisms contained in the purified wastewater from which organic matter, nitrogen and phosphorus have been removed, and return some of the sludge to the organic matter adsorption step 100. It consists of; precipitation step (600) comprising.

The organic material adsorption step 100 is a microorganism grown by using an organic material by mixing a certain amount of fluid carrier (Example: Linde brand name Linpor-12x12x15mm) into the anaerobic reaction tank (1) in which the inflow of air is blocked This is to provide a place where it can be attached and grow, and the organic matter contained in the introduced wastewater is absorbed or adsorbed by the microorganisms so that the concentration in the wastewater is lowered.

The degree of adsorption of organic matter, which indicates the concentration of organic matter in the wastewater, may vary slightly depending on the characteristics of the influent wastewater or the activity of the microorganisms, but when the age of the microorganism (age of the microorganism) is 14 and 25 days, The adsorption rate of organic matter was shown, in which the reaction time was 40 minutes.

At this time, the anaerobic reaction tank (1) is to form a suitable stirring device to maintain a state in which the influent wastewater and the media are sufficiently mixed to achieve a uniform contact to achieve homogenization of the organic concentration.

Waste water passing through the organic matter adsorption step (100) anaerobic reaction tank (1) is sent to the struvite crystallization tank (2), which is a struvite crystallization step (200) for removing nitrogen and phosphorus, and the media is formed in the pipeline. After being separated from the wastewater through a separation device (7), such as a screen, it is sent to the anoxic reaction tank (4), which is a denitrification step (400).

Wastewater introduced into the struvite crystallization tank 2 is injected with magnesium with a hydrogen ion concentration (pH) regulator such as sodium hydroxide (NaOH) so that struvite crystals can occur in an optimal state.

As is well known, the struvite crystal formed by combining Mg: NH ₄ : PO ₄ in a molar ratio of 1: 1: 1 has a high specific gravity, so that precipitation is rapid and the resulting precipitate can be used as a soil improver and fertilizer. It can be a useful substance.

At this time, the reaction time required for struvite crystallization is required within 2 minutes, and the struvite crystallization tank 2 under the struvite crystallization reactor 11 so as to smoothly recover the crystal and produce a compacted processing apparatus. It is preferable to form a, and the lower portion of the struvite crystallization tank (2) is to form an inclined surface or to form a suitable withdrawal device such as a valve or a solid transfer pump so that the precipitated struvite crystal can be easily recovered .

In particular, the struvite crystallization reaction tank 11 preferably forms an agitating apparatus so that the introduced wastewater, the injected hydrogen ion concentration regulator, and magnesium can be quickly and sufficiently mixed.

Nitrogen and phosphorus removal efficiencies of the wastewater that passed through the struvite crystallization step 200 were typically 80% or more.

According to the experiment, it was observed that 81 and 83% of nitrogen and 98% and 93% of phosphorus were removed using MgCl 2 and Mg (OH) 2 as magnesium sources. (Reference: Korean Society of Environmental Engineering, Vol 22 , No. 4, 2000.4, KOREA, Won-Seon Won et al., Removal of Nitrogen and Phosphorus by Struvite Crystallization, pp. 599-607). Tunay et al. (Ref .: Water Science and Technology, Vol. 36, No. 2-3, 1997, UK, O.Tunay, I. Kabdasli, D. Orhon and S. Kolcak, Ammonia removal by magnesium ammonium phosphate precipitation in industrial wastewater, pp.225-228) At pH 8.5, nitrogen and phosphorus showed 87% and 90.2% removal, respectively.

The wastewater passing through the struvite crystallization step 200 is introduced into the nitrification tank 3 and mixed with the media 13 in which microorganisms are separately injected to grow the nitrification step 300 where nitrification of the remaining nitrogen and phosphorus occurs. Happens.

At this time, since nitrifying bacteria which perform nitrification have a low growth rate and require a long residence time, the nitrifying bacteria are continuously carried out in the nitrification state in the nitrification tank 3, and the nitrification tank 3 The wastewater introduced into the nitrate is able to concentrate because of its low concentration of organic matter, which reduces the number of heterotrophic microorganisms (Heterotrohics) that decomposes organic matter among the microorganisms present in the nitrification tank (3) Increasing the number of autotrophics allows the removal of residual nitrogen.

The wastewater passing through the nitrification step 300 is introduced into the anoxic reaction tank 4 which is a denitrification step 400 and is transported with the organic matter absorbed and adsorbed in the anaerobic reaction tank 1 which is the organic material adsorption step 100. Mixed with

In order to remove nitrogen, first, since most nitrogen components in wastewater are organic nitrogen and ammonia nitrogen, nitrification and denitrification are required to remove them. Nitrification requires aerobic conditions by autotrophic microorganisms, and ammonia nitrogen is oxidized to nitrate nitrogen. On the other hand, denitrification requires anoxic conditions by heterotrophic microorganisms (Heteroptophics), and is a reaction in which nitrate nitrogen is reduced to nitrogen gas. In addition, an electron donor (organic material) for denitrification is required for a smooth denitrification reaction, and in the wastewater purification method, an electron donor (eg, acetate, methanol, etc.) is injected from the outside. However, if the organic matter contained in the wastewater is used as an electron donor for the denitrification reaction, it can be an economical purification method. The organic material absorbed and adsorbed on the media 13 will act as an electron donor for the denitrification reaction.

After the denitrification step 400, the wastewater is introduced into the post-aeration reaction tank 5 performing the organic decomposition step 500 together with the media 13 to perform aeration directly on the water surface using an agitator or the post-aeration reaction tank. Organic matter remaining in accordance with the respiration of the microorganisms attached to the media (13) by causing aeration is carried out by injecting air generated from a compressed air generator such as a compressor through the diffuser installed in the bottom of (5) And decomposition of organic matter remaining in the waste water will occur.

After a certain time has elapsed, the wastewater in which the decomposition of organic matter is completed is sent to the settling tank 6, which is a precipitation step 600.

At this time, the media 13 in which all of the absorbed organic substances are decomposed is mixed with the newly introduced wastewater according to the media recovery step 510 returned to the anaerobic reaction tank 1 performing the organic adsorption step 100 along the return pipe. It is used repeatedly.

The settling tank 6 is to separate the desorbed microorganisms or suspended matter and purified water so as to discharge the wastewater and the waste sludge produced.

At this time, some of the microorganisms precipitated in the settling tank (6) is returned to the anaerobic reaction tank (1) performing the organic material adsorption step (100) through the sludge conveying step 610 to purify the wastewater without newly injecting microorganisms It is possible to prevent the lack of microorganisms needed to.

Hereinafter, with reference to the accompanying drawings will be described in detail the most preferred embodiment of the present invention. First, in describing each of the drawings, only the same components have the same reference numerals as much as possible even if shown on different drawings.

2 is a schematic view showing an apparatus for treating wastewater according to a first embodiment of the present invention.

As shown, the nutrient treatment device of the wastewater using the median separator of the present invention is anaerobic reactor (1) and the anaerobic reactor (1) is mixed with the wastewater in which the media (13), which is a fluid carrier to grow microorganisms are attached ( It is connected to 1) and positioned below the struvite crystallization reactor 11 and the struvite crystallization reactor 11 including a hydrogen ion concentration (pH) regulator and a magnesium (Mg ⁺² ) injector. The struvite crystallization tank 2 in which precipitation of the true byte crystals occurs, and the struvite storage tank 10 connected to the lower part of the struvite crystallization tank 2 and extracting and storing the struvite crystals, and the struts Nitrification tank (3) following the bite crystallization tank (2) and mixed with the media (13) in which the inflowed wastewater grows separately injected microorganisms (3). In the anoxic reactor (4) and the anoxic reactor (4) in which the wastewater passed after the nitrification reactor (3) and the media (13) separated and discharged through the separator (7) from the anaerobic reactor (1) are mixed. Subsequently, the post-aeration reactor 5 and the post-aeration reactor 5 for aeration of the wastewater introduced together with the median 13 are followed by the post-aeration reactor 5 to induce sedimentation of suspended matter and desorbed microorganisms to perform solid-liquid separation. It is a structure which consists of the precipitation tank 6 containing a conveying pipe for conveying to the anaerobic reaction tank 1. As shown in FIG.

At this time, the anaerobic reactor (1), the struvite crystallization reactor (11), the nitrification reactor (3), the anoxic reactor (4), and the post-aeration reactor (5) were provided with a stirring device to form an inflow wastewater, median, inflow wastewater, and hydrogen. The ion concentration regulator and magnesium (Mg ⁺² ) can be completely mixed, and the bottom of the struvite crystallization tank (2) and the settling tank (6) collects precipitated struvite crystals or waste sludge. In order to form an inclined surface or a drawer such as a valve or an inlet pump can be formed.

In particular, in the anaerobic reactor (1), nitrification reactor (3) and post-aeration reactor (5) into which the media (13) is introduced, a separator (7) or a screen (12) for separating the wastewater and the media (10) is formed. In order to prevent the outflow of the media (13), the separator (7) and the screen (12) has a mesh having a gap smaller than the standard of the media (10) at the branching position of the branch pipe ( It can be realized by various methods such as being formed by inserting a mesh).

On the other hand, the struvite crystallization tank 11 can be formed in the inner space of the struvite crystallization tank 2 because its reaction time is extremely short compared to the entire purification time and its size is also small.

In the wastewater purification apparatus using the media separation apparatus of the present invention having the above configuration, nitrogen and phosphorus are removed from the struvite crystallization tank (2), and the remaining nitrogen and phosphorus are nitridation tank (3) and anoxic reactor (4). It is to be removed by the denitrification reaction using the organic matter contained in the waste water while passing through, and the organic matter is removed in the post-aeration reactor (5) to remove the organic matter, nitrogen and phosphorus contained in the waste water. .

3 is a schematic view showing an apparatus for treating wastewater according to a second preferred embodiment of the present invention.

According to FIG. 3, an apparatus for treating nutrients in wastewater using the median separator of the present invention is an anaerobic reactor (1) and the anaerobic reactor, in which the media (13), which is a fluid carrier that grows with microorganisms, is mixed with the wastewater. It is connected to (1) and located below the struvite crystallization reactor 11 and the struvite crystallization reactor 11 including a hydrogen ion concentration (pH) regulator and a magnesium (Mg ⁺² ) injector. The struvite crystallization tank 2 in which precipitation of struvite crystals occurs, and the struvite storage tank 10 connected to the lower part of the struvite crystallization tank 2 to draw out and store the struvite crystals, and the stock Nitrification tank (3), which is followed by TrueBit crystallization tank (2) and mixed with media (13) in which microorganisms in which the inflowed wastewater is separately injected are grown, Intermittent aeration in which the wastewater passed after the substrate oxidation tank 3 and the media 13 separated and discharged from the anaerobic reactor 1 through the separator 7 are mixed, and the aeration and non-aeration are repeated according to a predetermined time distribution. Post-aeration reactor (5) followed by the intermittent aeration reactor (8) and the intermittent aeration reactor (8) and aeration to the wastewater introduced with the media (13); It is a structure which consists of the precipitation tank 6 containing the conveyance pipe for inducing precipitation of solid_liquid and performing solid-liquid separation, and conveying some microorganisms to the anaerobic reaction tank 1. As shown in FIG.

The intermittent aeration reaction tank 8 performs aeration directly on the surface of the water using a stirrer according to the operation method or the air generated from the compressed air generator such as a compressor through an acid pipe installed at the bottom of the intermittent aeration reaction tank 8. Repetitive times for operating the aeration device by a method such as injection or the like to perform aeration or stopping the operation of the aeration device to maintain a non-aeration state are 1 hour / 1 hour, 2 hours / 1 hour and 2 hours, respectively. It can be operated in hours / 2 hours, etc. This operation method is a method for removing the nitrogen and phosphorus in the low concentration of effluent removed in the sturubite crystallization tank (2) according to the waste water properties, for example, ammonia Assuming that nitrogen and phosphorus are introduced at 100 mg / L and 10 mg / L, respectively, and 90% are removed from the struvite crystallization tank (2), nitrogen and phosphorus are theoretically between 10 mg / L and 1 mg / L. In order to maximize the removal of nitrogen and phosphorus in this case, it is to be introduced into the hull aeration reactor (5), the nitrification and denitrification reaction required for nitrogen removal occurs repeatedly and can reduce the power cost.

By nitrifying bacteria (Nitrosomonas & Nitrobacter) the ammonia nitrogen and organic nitrogen in aerobic conditions by microbial nitrification in the anoxic conditions by (deformation of ammonia to nitrate form) and denitrification bacteria to nitrate (Pseudomonas, Paracoccus Denitrifiers etc.) and to be used as an electron acceptor instead of oxygen converted to nitrogen gas will which can be removed by radiation (denitrification) into the atmosphere, which is to keep under an anaerobic condition and an aerobic condition to shift the waste water removed in the anaerobic conditions, micro-organisms (Acinetobacter) In the subsequent aerobic conditions, the phosphorus is removed from the wastewater in such a way that the microorganisms excessively ingest the phosphorus and then remove the microorganisms by a certain amount, thereby maximizing nitrogen and phosphorus removal efficiency.

4 is a schematic view showing an apparatus for treating wastewater according to a third embodiment of the present invention.

According to FIG. 4, it is the same as the 2nd Embodiment shown in FIG. 3, but only the intermittent aeration reactors 8 and 9 are provided in multiple numbers.

At this time, the intermittent aeration reactor (8) (9) divided into a plurality of the first intermittent aeration reactor (8) is operated by the aeration, the second intermittent aeration reactor (9) to operate by changing the aeration and non-aeration with each other in the non-aeration It will be able to maximize the removal rate of nitrogen and phosphorus.

Since the present invention removes nitrogen and phosphorus from wastewater by using the struvite crystallization method, it is transported to a denitrification tank so that the nitrogen and phosphorus remaining can be effectively used to denitrify the organic matter contained in the wastewater. Since the separated wastewater is low in organic matter, there is an advantage in that the growth and nitrification of nitrifiers can be enhanced in the nitrification tank. In addition, the use of media in the overall process can reduce the amount of sludge generated.

The nutrient purification method and treatment apparatus for wastewater according to the present invention is a purification method that first removes by struvite crystallization and removes residual nitrogen and phosphorus by biological purification process, and operates by concentrating nitrifying bacteria during biological purification. It is expected that there is an advantage that does not require the injection of an external electron donor by using the organic matter contained in the waste water to the maximum denitrification reaction.

In addition, the present invention has the advantage that it can be applied to the waste water purification that acts as toxic to microorganisms because of high ammonia nitrogen, such as industrial wastewater.

1 is a process chart showing the wastewater purification method of the present invention.

2 is a schematic view of a wastewater treatment apparatus according to a first embodiment of the present invention.

3 is a schematic view of a wastewater treatment apparatus according to a second embodiment of the present invention.

4 is a schematic view of a wastewater treatment apparatus according to a third embodiment of the present invention.

5a and 5b are schematic views of a separator for separation of media and wastewater;

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

1: anaerobic reactor 2: struvite crystallization tank

3: nitrification tank 4: anoxic reactor

5: post-aeration reactor 6: precipitation tank

7: Separator 8: Intermittent Aeration Reactor

9: second intermittent aeration reactor 10: struvite storage tank

11: Struvite crystallization reactor 12: screen

13: Mediah 100: organic matter adsorption step

200: struvite crystallization step 300: nitrification step

400: denitrification step 500: organic decomposition step

600: precipitation step

Claims (4)

In the nutrient purification method included in the wastewater or sewage, the organic matter adsorption step for inducing the adsorption of organic matter in an anaerobic state by contacting the introduced wastewater with the media, which is a fluid carrier that grows with microorganisms (100) And; a media separation step (110) for separating a media having a certain amount of organic matter adsorbed therethrough while passing through the organic material adsorption step (100); and a hydrogen ion concentration (pH) regulator in wastewater after the organic material adsorption step (100); The struvite crystallization step 200 for removing nitrogen and phosphorus by injecting magnesium (Mg ⁺² ); and the struvite crystallization step 200 to remove a certain amount of organic matter and nitrogen and phosphorus Nitrification step (300) of inducing nitrification reaction by contacting the medium, which is a fluid carrier, to which microorganisms are attached and grown to remove nitrogen and phosphorus remaining in the waste water; and the nitrification step Denitrification step 400 occurs in the anaerobic (400) by using the organic material adsorbed in the media by mixing with the media separated in the media separation step 110 in the wastewater past (300) as an electron donor; and the An organic material decomposition step 500 in which organic matter remaining in the wastewater mixed with the organic material attached to the media is decomposed together after the denitrification step 400; and the media from which the organic material is removed while the organic material decomposition step 500 passes. A media recovery step 510 for separating and transferring the organic material adsorption step 100; And the sludge conveying step 610 of passing through all the above steps to precipitate and remove the suspended matter and some desorbed microorganisms contained in the purified wastewater from which organic matter, nitrogen and phosphorus have been removed, and return some of the sludge to the organic matter adsorption step 100. Sedimentation step (600) comprising ;; nutrients purification method of wastewater using the median separator characterized in that consisting of. The anaerobic reactor (1) and the anaerobic reactor (1), which are mixed with the influent wastewater, in which the media (13), which is a fluid carrier grown by microorganisms, is connected to the anaerobic reactor (1), and a hydrogen ion concentration (pH) regulator and magnesium (Mg ⁺² ) The struvite crystallization tank 11 including the injection device, and the struvite crystallization tank 2 and the struvbite located below the struvite crystallization reactor 11, where precipitation of struvite crystals occurs. It is connected to the lower part of the crystallization tank (2), the struvite storage tank (10) for extracting and storing the struvite crystals and the microorganisms separately injected with the wastewater introduced after the struvite crystallization tank (2) are grown. Separation from wastewater and subsequent anaerobic reaction tank (1) which are mixed with the media (13) and undergoes the nitrification reaction tank (3) where the residual nitrogen and phosphorus nitrification reactions occur, and the nitrification reaction tank (3). The anoxic reactor (4) into which the media (13) separated and discharged through the tooth (7) are mixed and the aerobic reactor (5) subsequent to the anoxic reactor (4) and performing aeration on the wastewater introduced with the media (13). And a sedimentation tank (6) including a return pipe for carrying out solid-liquid separation by inducing precipitation of suspended matter and detached microorganisms following the post-aeration reaction tank (5) and returning some of the microorganisms to the anaerobic reaction tank (1). Nutrients processing device of the wastewater using the median separator characterized in that. The apparatus for treating nutrient salts in wastewater using a media separation device according to claim 2, wherein the post-aeration reactor (5) is operated as an intermittent aeration reactor (8) in which aeration and non-aeration are repeated according to a predetermined time distribution.        3. An apparatus for treating nutrient salts in wastewater using a median separator according to claim 2, wherein at least one intermittent aeration reactor (8) (9) is further provided at the front end of the post aeration reactor (5).