KR101167488B1 - Simultaneous eliminating system of phosphorous and nitrogen in wastewater - Google Patents

Abstract

PURPOSE: A system for simultaneously eliminating phosphorus and nitrogen from sewage and wastewater is provided to save costs required for operational processes by reducing the using amount of chemicals and the generating amount of sludge. CONSTITUTION: A system for simultaneously eliminating phosphorus and nitrogen from sewage and wastewater introduces sewage and wastewater through primary physical treatment(102) and secondary chemical treatment(103) into a reactor(100). Remaining nutrient substances are eliminated from the sewage and the wastewater in the reactor. The reactor includes a media filter. Physicochemical treatment for eliminating phosphorus and biological treatment for eliminating nitrogen are simultaneously implemented through the media filter. Dissolved phosphorus in introducing water is absorbed on the media filter to implement the physiochemical treatment, and denitrifying microorganisms formed on the surface or the pores of the media filter implements the biological treatment. The media filter includes sand-based filtering materials coated with hydrous ferric oxides.

Description

Simultaneous Removal of Phosphorus and Nitrogen from Sewage Wastewater {SIMULTANEOUS ELIMINATING SYSTEM OF PHOSPHOROUS AND NITROGEN IN WASTEWATER}

The present invention relates to a sewage treatment system, and more particularly, to a system for simultaneously removing phosphorus and nitrogen in nutrients remaining in secondary treated sewage.

Recently, due to economic growth, industrial development and improvement of living standards, the generation of various wastewaters such as domestic sewage, industrial wastewater, and livestock wastewater is rapidly increasing, and these wastewaters flow into the lakes and rivers and can no longer be used for various types of water, It is polluting the water quality enough to cause serious damage.

Organic substances such as suspended solids and nutrients contained in large amounts of sewage water promote algae breeding and growth to promote eutrophication of lakes and rivers. Among nutrients, phosphorus is required for all living organisms and can be used in the environment. Due to the very small amount present in the form, it acts as a limiting material in red tide and eutrophication, and thus is attracting attention as a major factor of water pollution. In addition, nitrogen is mainly released in the form of organic nitrogen and ammonia nitrogen into the wastewater, released to the environment, then converted to nitrite by microorganisms, and then to nitrate, which requires very large oxygen demands to contaminate water quality. do. As such, phosphorus and nitrogen contained in the wastewater are the main culprit of the destruction of ecosystems, and the destroyed ecosystems are almost impossible to recover or require much time and cost to recover. In particular, it is recognized as a must-have problem for key national tasks such as revitalizing the Four Rivers. In this regard, the Ministry of Environment has recently implemented a plan to strengthen the concentration of total phosphorus in the discharge of public sewage treatment facilities from 2 mg / l up to 0.2 mg / l in order to preserve the water quality of public waters due to the increased eutrophication of rivers. Is expected.

Meanwhile, various attempts have been made to simultaneously treat phosphorus and nitrogen by physicochemical or biological unit processes for removing phosphorus and nitrogen from wastewater from which dissolved BOD is removed using biological pretreatment such as aeration tanks. For example, there is a technique using chemical treatment with flocculants and tertiary precipitation or filtration for effluents that have undergone biological advanced treatment. Most of this technology uses a filtration process with a tertiary sedimentation tank after aggregation using alum or polyaluminum chloride (PAC), or uses only filtration without a tertiary sedimentation tank. It is known that this can be achieved, but in order to reduce the concentration of phosphorus, a large amount of flocculant is administered, so that fine flocs due to excessive use of the drug may accumulate in the pores of the filter or block the pores. Additional process is required.

In addition, biological phosphorus and nitrogen removal techniques generally depend on the placement and number of bioreactors, the sludge return location from the settling tank, the internal return location between each reactor, and the availability of media to maximize biological treatment capacity. Representative methods include the Euro-Freight Treatment (HDF), Bio Best Bacillus (B3), Khoho & KIST intermittently decanted extended aeration (KIDEA), HBR (specialty soil microbial) treatment, anaerobic / anaerobic / aerobic / Treatment methods using degassing tanks and submerged hollow fiber membranes (HANT), and treatment methods using ultrafiltration hollow fiber membranes (MBR). In the field application status of these methods, continuous flow advanced treatment is mainly applied to large sewage treatment plants, and continuous batch advanced treatment is applied to small and medium scales for the purpose of elastic response of inflow. have. However, these methods are difficult to maintain the concentration of microorganisms mainly because the solid-liquid separation of microorganisms and treated water is carried out in the sedimentation tank by gravity settling, and it is difficult to maintain the concentration of microorganisms due to fluctuations in inflow loads and impact loads such as influx of toxic substances. Swelling may occur to reduce the water quality of the treatment or the active microorganisms are lost, which makes it difficult to efficiently treat the water. In particular, the continuous flow advanced treatment method requires a large site because it needs to install two to five or more independent reaction tanks and terminal settling tank depending on the process, there is a disadvantage that is not suitable for small and medium scale advanced processing. In addition, due to the qualitative and quantitative characteristics of domestic wastewater, which has a low concentration of organic carbon sources and a large change in pollutant loads by season, its performance is often not properly exhibited. In the case of the MBR process, it is economically feasible even at a small scale, it is easy to automate, it is easy to operate, and shows high processing efficiency. In order to recover the performance of the system, periodic cleaning or replacement of the membrane is required, and there is a problem such as unstable treatment efficiency due to low C / N ratio characteristics of domestic sewage.

Therefore, as a technology to remove phosphorus and nitrogen for the secondary treatment water of the sewage treatment plant, the anaerobic tank, aerobic tank and anoxic tank are repeated through a biological treatment process, or a physicochemical treatment method using a flocculant is used for further phosphorus removal. There is a need to develop a method that can be applied to the site at a low cost with simultaneous removal of phosphorus and nitrogen from the conventional method.

Accordingly, the present invention has been made to solve the above problems, to provide a system for simultaneously removing the total phosphorus and total nitrogen which is the causative agent of eutrophication from sewage water using a simple treatment facility.

In addition, the present invention is to provide a system for simultaneous removal of phosphorus and nitrogen in the sewage water that can satisfy the total phosphorus and total nitrogen levels in the effluent required based on various environmental regulations and policies.

In addition, the present invention is to provide a system that can reduce the treatment cost due to excessive chemicals, sludge generation and the like and economically remove the phosphorus and nitrogen of the wastewater at the same time using a minimum area.

In order to solve the above problems, the present invention is to remove the nutrient components remaining in the influent in the same reaction tank by using the physical wastewater treated as the primary treatment and biological secondary treatment in the same reaction tank, the reaction tank is a physicochemical treatment for phosphorus removal and A simultaneous treatment of phosphorus and nitrogen in sewage water with a media filter capable of simultaneously biological treatment for nitrogen removal, wherein the physicochemical treatment is carried out by adsorption of dissolved phosphorus contained in the influent into the media filter and the biological treatment The denitrification microorganisms formed on the surface or the pores of the media filter is carried out using the nitrate nitrogen contained in the influent as a hydrogen acceptor, the media filter includes a sand filter coated with hydrous ferric oxides, The adsorption is achieved by contacting the influent with the coated iron hydroxide. And a carbon source used by the denitrification microorganism is supplied together with the influent to provide a system for simultaneously removing phosphorus and nitrogen in sewage.

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In addition, the iron hydroxide is at least one member selected from the group consisting of amorphous iron hydrate, ferrihydrite, geiteite, lepidocrocite and hematite. Provide a simultaneous removal of phosphorus and nitrogen from sewage water.

In addition, the carbon source provides a simultaneous removal of phosphorus and nitrogen in the wastewater, characterized in that methanol or ethanol.

The media filter also provides a simultaneous removal of phosphorus and nitrogen from the wastewater, characterized in that it is operated in an oxygen free environment.

In addition, the reaction tank is a dispersion pipe installed in the lower portion of the reaction tank, an air lift pipe installed perpendicular to the reaction tank, a contaminated water chamber installed on the upper portion of the air lift tube, a contaminated water pipe connected to the contaminated water chamber, the upper portion of the reaction tank A discharge water pipe installed at an upper end of the reaction tank and a discharge water pipe installed at the upper end of the reaction tank, and the inflow water is injected upward from the dispersion pipe to contact the sand media, and the discharged water from which phosphorus and nitrogen are removed is discharged into the discharge water pipe, and the generated gas is discharged. Is discharged to the gas discharge pipe, and the sand filter is raised to the polluted water chamber through the air lift pipe, and the separated polluted water is discharged to the polluted water pipe and the raised sand filter is dropped and reused. Provide a simultaneous removal of phosphorus and nitrogen from sewage water.

In addition, it provides a system for simultaneously removing the phosphorus and nitrogen of the wastewater, characterized in that it further comprises a control unit for controlling the carbon source supply based on the carbon and nitrogen levels in the discharge water discharged to the discharge pipe.

According to the present invention, by simultaneously removing the phosphorus and nitrogen of the wastewater through a single treatment in a single reactor, simultaneous removal of phosphorus and nitrogen of the wastewater, which can greatly simplify the treatment process while drastically reducing the treatment cost according to the multi-process. Can be provided.

In addition, by forming phosphorus ion exchange adsorption by coating media filter, various agglomerated salts are formed at an amorphous state, and chemical input amount control is not required according to phosphorus concentration of influent, so that phosphorus can be removed with high efficiency, and optimum control of carbon source supply amount can be achieved. Nitrogen can be removed with high efficiency.

In addition, an air lift pipe is installed inside the reactor to transfer sand media to the contaminated water chamber from the bottom to clean and regenerate it, eliminating the need for backwashing or replacing the media and ensuring stable water quality regardless of load fluctuations. You can make it possible.

In addition, the amount of chemicals used and the amount of sludge generated may reduce the treatment cost accordingly.

1 is a block diagram schematically showing an example in which the simultaneous removal of phosphorus and nitrogen in the wastewater according to an embodiment of the present invention is applied,
Figure 2 is a cross-sectional view illustrating the operation of the simultaneous removal of phosphorus and nitrogen in the wastewater according to an embodiment of the present invention,
3 is a schematic diagram illustrating a mechanism in which phosphorus is removed by a media filter in the present invention;
Figure 4 is a schematic diagram illustrating the mechanism by which nitrogen is removed by the microbial membrane formed on the surface of the media filter in the present invention,
5 is a schematic diagram illustrating a carbon source supply control process according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. In the drawings, parts irrelevant to the description are omitted for simplicity of explanation, and like reference numerals designate like parts throughout the specification. In addition, throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, not to exclude other components, unless otherwise stated.

1 is a block diagram schematically showing an example in which the simultaneous removal of phosphorus and nitrogen of the wastewater according to an embodiment of the present invention is applied, Figure 2 is a simultaneous removal of phosphorus and nitrogen of the wastewater according to an embodiment of the present invention It is a cross-sectional view illustrating the operation.

As shown in FIG. 1, the simultaneous phosphorus and nitrogen removal system of sewage water according to an embodiment of the present invention is a sedimentation tank 103a after physical primary treatment 102 and biological secondary treatment 103 for raw water 101. ) Is a system for simultaneously removing phosphorus and nitrogen from a single reactor (100) using the wastewater that has passed through) as the inflow water (104). The primary treatment 102 and the secondary treatment 103 for the raw water 101 are generally known methods, for example, the primary treatment 102 may be used to screen, filter, or filter suspended matter in the raw water 101. The sedimentation may be mainly performed by physical action, and the secondary treatment 103 may be a process of biologically treating the organic material in the wastewater 105 subjected to the primary treatment 102. In FIG. 1, 106 denotes a sludge conveying line leaching from the secondary settling tank, 107 denotes a sludge digester, and 108 denotes a dehydration tank that dehydrates digested sludge to produce a dewatered cake 109.

Referring to FIG. 2, in the present invention, the reaction tank 100 includes a dispersion pipe 110, an air lift pipe 120, a contaminated water chamber 130, a sand filter cleaning unit 140, and a sand filter transporting means 150. It may be configured to include a contaminated water pipe 160, discharge water pipe 170 and the gas discharge pipe (180).

The sand filter 190 is filled in the reaction tank 100 to serve as a media filter, and the wastewater passing through the sand filter 190 is moved upward to remove contaminants including phosphorus and then discharge ware 171. The discharge water pipe 170 is installed on the reaction tank 100 so as to be overflowed and discharged. At this time, the wastewater moved to the upper portion is injected into the sand medium 190 through the distribution pipe 110 is installed in the lower portion of the reaction tank (100).

The sand filter 190 may include adsorption means 191 for physicochemical treatment of dissolved phosphorus included in the influent 104. 3 is a schematic diagram illustrating a mechanism in which phosphorus is removed by a media filter in the present invention. That is, referring to FIG. 3, the sand filter 190 is coated with the adsorption means 191 to allow dissolved phosphorus to be adsorbed to the adsorption means 191 in the wastewater 192 which is contacted and passed upwardly. The sand filter 190 in which the dissolved phosphorus is adsorbed is moved downward. Here, the dissolved phosphorus is PO ₄ -P and accounts for about 90% of the total phosphorus of the influent 104 passed through the secondary settling tank 103a to remove phosphorus. Accordingly, in the present invention, the hydrous ferric oxides (HFO) may be coated on the sand media 190 by the adsorption means 191 having affinity for the dissolved phosphorus. Examples of the iron hydroxides include amorphous iron hydrates (am-Fe (OH) ₃ , ferrihydrite (FepOr (OH) s? NH ₂ O), geosite (α-FeOOH), and lipido. Crosite (lepidocrocite, γ-FeOOH), hematite (hematite, α-Fe ₂ O ₃ ), etc. These iron hydroxides are introduced into the reaction tank 100 together with the influent 104 and the water and It can be mixed to be coated on the sand filter 190. In this case, the amount of the iron salt is added in proportion to the amount of inlet irrespective of the phosphorus concentration of the inlet 104 can be easily adjusted.

The iron hydroxide has a very high ability to adsorb a cation or anion and has a large specific surface area, and thus has a physical and chemical property. The iron hydroxide is present in the form of a solid in water where iron salt is present and adheres to the surface of the material. Therefore, the iron hydroxide present in the water and the dissolved ions interact to control the mobility or concentration of the ions. Sand media 190 constituting the media in the present invention is a material having a stable and constant cationic surface charge, a condition that takes a non-charge on the surface of the media in consideration of the characteristics of the treated sewage, pH conditions, etc. (point of zero net proton charge (PZNPC). In other words, PZNPC refers to a pH level at which surface charge becomes zero. In a pH condition lower than PZNPC, surface charges are positively charged, and vice versa, surface charges are negatively charged. The surface charge can be adjusted according to such pH conditions, and the adsorption and removal of the oppositely charged material contained in the target wastewater 192 to be treated can be removed. As a result, by using the PZNPC characteristics, the positively charged iron hydroxide is coated on the surface of the negatively charged media so that the charge of the final media is positively charged, thereby adsorbing the negatively charged dissolved phosphorus to phosphorus in the wastewater 192. It can be removed in the form of a combined solid (193). The surface reaction of the iron hydroxide and the reaction constant of the dissolved phosphorus may be represented by the following Chemical Formulas 1 to 3.

The air lift pipe 120 is installed vertically in the reaction tank 100 to raise the sand medium 190 and water in which contaminants such as phosphorus are adsorbed by air supplied by a compression means (not shown). do. At this time, a primary cleaning action occurs in which the contaminants attached to the sand filter 190 are separated by the speed difference between the sand filter 190, water, and air moved upward.

The contaminated water chamber 130 is installed above the air lift pipe 120 to collect the sand media 190 and contaminated water raised through the air lift pipe 120. One side of the contaminated water chamber 130 may be a contaminated water wear 131 for adjusting the contaminated water level. In addition, the polluted water chamber 130 is provided with a polluted water pipe 160 for discharging the polluted water overflowing the polluted water 131 to the outside. The contaminated water pipe 160 is connected to the contaminated water chamber 130 at one end to discharge contaminated water collected in the contaminated water chamber 130, and the other end thereof is sludge conveying line 161. Can be connected to.

The sand filter cleaning unit 140 may be disposed below the contaminated water chamber 130, and a zigzag flow path 141 may be formed to allow the first cleaning of the sand filter 190 to fall downward while cleaning the sand filter 190. . The zigzag flow path 141 is connected to the upper and lower portions so that the sand filter 190 falling from the contaminated water chamber 130 moves downward, and the treated water rising from the lower portion moves upward. Therefore, the pollutant separated from the zigzag flow path 141 moves to the polluted water chamber 130 together with the upstream treated water. At this time, the amount of treated water flowing into the contaminated water chamber 130 through the zigzag flow path 141 is increased to prevent deterioration of the pollutant removal efficiency due to the decrease in the concentration of the contaminated water discharged through the contaminated water pipe 160. To this end, a circulating path 142 may be further formed in the zigzag flow path 141 to recycle a portion of the treated water rising from the lower portion to the reactor 100.

The sand media conveying means 150 is a vertical pipe 151 installed to communicate with the lower end of the air lift pipe 120, a rotary shaft 152 installed perpendicular to the center of the vertical pipe 151 and the rotary shaft 152 It may be provided with a screw 153 installed on the outer peripheral surface of the. The rotating shaft 152 may transfer compressed air to the inside in a pipe shape, and the gear unit 154 and the driving motor 155 are driving means for rotating the rotating shaft 152 at the lower end of the rotating shaft 152. It may be provided. Therefore, the rotation shaft 152 is rotated by the gear unit 154 by the driving of the drive motor 155, the screw 153 installed on the outer circumferential surface of the rotation shaft 152 is on the bottom of the reaction tank 100 The sinking contaminated sand media 190 is slowly moved upwards. In this case, the screw 153 may be easily transported to the upper by loosening the sand filter 190 aggregated by the contaminants.

In addition, between the airlift pipe 120 and the vertical pipe 151, a part of the contaminated sand filter 190 transported to the top to prevent accumulation of contaminated sand filter 190 may be discharged. A through hole 121 may be further formed, and the diffusion plate 122 is attached to the vertical pipe 151 to prevent the sand filter 190 discharged through the through hole 121 from falling directly below. Can be.

The gas discharge pipe 180 is to discharge the nitrogen gas biologically treated in the same reaction tank 100 according to the present invention, it can be installed on the top of the reaction tank (100).

In the present invention described above, the reactor 100 is modular, which is advantageous for on-site application such as new and expansion, and additional installation work for partial repair and repair and application to existing facilities is easy. Hereinafter, a process in which nitrogen removal is simultaneously processed in the same reactor 100 in one embodiment of the present invention will be described.

According to an embodiment of the present invention, nitrogen removal included in the influent 104 is simultaneously performed with phosphorus removal in a media filter including the iron hydroxide coated sand media 190. Specifically, the nitrogen contained in the inflow water 104 introduced into the reaction tank 100 is nitrate nitrogen (NO ₃ ⁻ ), in which the nitrification process is completed in the secondary treatment process 103, of the media filter 190. By denitrifying microorganisms such as Pseudomonas or Bacillus, which are present on the surface or in the pores, the nitrate nitrogen is used as a hydrogen acceptor in an anaerobic or anoxic state and is in a nitrogen gas (N ₂ ) state. The gas may be discharged into the atmosphere through the discharge pipe 180.

Since the nitrification process in the secondary treatment step 103 is an aerobic state, oxygen is used as an energy source. However, since denitrification in the reactor 100 is performed in an oxygen-free state, carbon is required as an energy source. Methanol, ethanol, acetic acid, methane, etc. may be used as the carbon source, but it is preferable to use methanol or ethanol in consideration of mixing with the influent 104 and diffusion into the sand media 190, and using methanol. More preferred. The carbon source may be supplied to the reactor 100 along with the secondary treated influent 104, and a detailed control process of the carbon source to be supplied will be described later.

Here, looking at the cell synthesis mechanism for energy reaction and denitrification microbial growth when methanol is supplied as a carbon source, it can be represented by the formulas 5 and 6.

Thus, when applied in situ, the amount of methanol required for the synthesis of cells may be about 25-30% by weight of the amount required for energy. As a result, the amount of methanol required to remove nitrate nitrogen can be obtained from the following formula (7).

However, since dissolved oxygen, NO 2-and the like are present in the wastewater, it may be as follows.

In the present invention, the microbial group or the biofilm formed on the surface or the pores of the media filter 190 removes nitrogen having a form of nitrate nitrogen, which is nitrified through the aeration process in the biological treatment tank 103, and the reaction tank 100. Depending on the residence time of the desired level of nitrate nitrogen can be removed, it can be lowered up to 0.1 mg / l or less without exceeding a maximum of 1 mg / l. Figure 4 is a schematic diagram illustrating the mechanism by which nitrogen is removed by the microbial membrane formed on the surface of the media filter in the present invention. That is, referring to FIG. 4, the microbial membrane 194 is formed on the surface of the sand filter 190 so that nitrate nitrogen is denitrated in the wastewater 192 which passes through contact with the upward direction. The denitrified nitrogen gas 195 moves upward and is discharged into the atmosphere through the gas discharge pipe 180.

As described above, in the present invention, when the inflow water 104 passes through the media filter having the iron hydroxide coated sand filter 190, PO ₄ -P included in the inflow water 104 is adsorbed and removed by the iron hydroxide. At the same time, the nitrate nitrogen included in the influent 104 is denitrated to nitrogen gas 195 by the denitrifying microorganism using the carbon source supplied with the influent 104.

As such, in the present invention, the chemicals supplied through the influent 104 may include the iron salt for coating the media filter 190 and a carbon source for feeding microorganisms. It is sufficient to control the input proportionally, but in the case of the carbon source, it is not desirable that the carbon source remains in the high price of the drug and the effluent so that the microorganism performing the denitrification process does not supply an excessive amount than the amount of the carbon source that can be utilized. It is desirable to.

Therefore, the present invention can control the supply of carbon sources by utilizing indirect information on the state of the microorganisms. That is, the system according to an embodiment of the present invention may include a controller 200 to adjust the carbon source supply amount based on the carbon and nitrate nitrogen levels in the effluent water 201 from the reaction tank 100. The controller 200 may obtain carbon and nitrate nitrogen levels in the discharge water discharged to the discharge water pipe 170 through the process of removing phosphorus and nitrogen. In this case, if the carbon level decreases and consequently the nitrate nitrogen level increases, it indicates that the microorganisms are under nutrition, in which case the source of carbon is supplied so that the microorganisms can convert more nitrogenous nitrogen to nitrogen gas. Can be increased. In addition, when both the carbon level and the nitrate nitrogen level are high or elevated, appropriate conditions may allow microorganisms to utilize or less utilize the supplied carbon source. These conditions can be detected to take appropriate measures, such as reducing the carbon source supply rate, temporarily stopping the carbon source supply, or alerting for further action.

5 is a schematic diagram illustrating a carbon source supply control process according to an embodiment of the present invention. Hereinafter, an example of a carbon source supply amount control process will be described in more detail with reference to FIG. 5.

The system includes a feeder 210 for supplying a carbon source 208 to the influent 104 of the reactor 100. The supply amount delivered from the supply device 210 may be controlled by the control unit 200 as a control signal 209. The controller 200 may control the supply device 210 based on the level information obtained from the inflow water 104 and the discharge water 201. That is, the carbon level sensed by the level sensor 220 which transmits the level signal 202 to the controller 200 may be included in this information. Level sensor 220 may sense chemical oxygen demand (COD), total organic carbon (TOC), and other suitable carbon level parameters. The discharge water flow rate sensor 230 transmits a signal 203 to the controller 200 in relation to the flow rate of the discharge water 201. Similarly, the contaminated water flow rate sensor 240 transmits the contaminated water flow rate signal 204 to the controller 200 in relation to the flow rate in the contaminated water 207. On the other hand, it may be estimated that the flow rate of the inflow 104 is approximately equal to the sum of the total flow rates of the effluent 201 and the contaminated water 207.

In addition, the system may be connected with one nitrate nitrogen sensor or probe 270 to two sample streams 250, 260 located in each of the influent 104 and the effluent 201. The sensor 270 may deliver to the controller a signal 205 relating to the nitrate nitrogen level for the influent 104 or a signal 206 relating to the nitrate nitrogen level for the effluent 201. The control unit 200 determines the carbon source supply level using one or more input signals 202 to 206, thereby discharging carbon dioxide into the effluent 201 or discharging the nitrogen nitrate nitrogen gas without excessive emission. To facilitate the conversion.

The controller 200 may be implemented in various forms. For example, it may be implemented in the form of a black box such as an application specific integrated circuit (ASIC), or may be implemented in the form of an application in a computing device such as a computer. In such an embodiment, the control unit 200 may provide a user interface, and an operator may observe a carbon source supply from the user interface or adjust various algorithm parameters to satisfy specific facility emission standards.

Experimental Example

The apparatus shown in FIG. 2 to which the simultaneous removal of phosphorus and nitrogen in the wastewater according to the embodiment of the present invention described above is applied to the sewage treatment plant, and treated as a model plant (pilot plant) on a scale of 55㎥ / day The total phosphorus removal rate was evaluated according to the Standard Methods (APHA, 1995) by operating in a dose and operating under controlled conditions of nitrate nitrogen in the effluent not exceeding 1 mg / l. During the evaluation period, the treated water flowed in the range of 49 ~ 64.8㎥ / day, average 60.5㎥ / day, and the water temperature in the single reactor was 13.5 ~ 19.5 ℃, total phosphorus was 0.4 ~ 3.7mg / ℓ, average 1.5mg / ℓ. Inflowed. Tables 1 and 2 show total phosphorus and PO ₄ -P removal efficiencies, respectively, and Table 3 shows the BOD, COD and SS treatment efficiencies together with phosphorus removal efficiencies.

Referring to Tables 1 to 3, the total phosphorus removal efficiency was controlled to an average of 89.5%, the total phosphorus concentration of up to 0.2 mg / L, the PO ₄ -P removal efficiency of 96.9% on average, PO ₄ -P concentration up to 0.127 mg / It was controlled by ℓ to control the nitrate nitrogen in low concentration and at the same time showed the excellent phosphorus removal performance.

From the experimental results of the model facility, it was confirmed that the present invention can remove more than 90% of the phosphorus concentration in the sewage treatment plant effluent, and considering that the dissolved PO ₄ -P in the influent accounts for 90% or more, It can be expected that the concentration can be controlled up to 0.2 mg / L or less, and that the phosphorus concentration of 0.05 mg / L or less can be discharged when a single reactor is connected in two stages.

Preferred embodiments of the present invention have been described in detail above with reference to the drawings. The description of the present invention is for illustrative purposes, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the scope of the present invention is shown by the claims below rather than the detailed description, and all changes or modifications derived from the meaning, scope, and equivalent concepts of the claims are included in the scope of the present invention. Should be interpreted.

100: reactor 101: raw water
102: primary processing 103: secondary processing
103a: sedimentation tank 104: influent
105: primary treated wastewater 106: sludge return line
107: sludge digester 108: dehydration tank
109: dewatered cake 110: dispersion tube
120: air lift pipe 121: through hole
122: diffusion plate 130: contaminated water chamber
131: contaminated water wear 140: sand filter cleaning unit
141: zigzag euro 142: circulation
150: sand filter transfer means 151: vertical pipe
152: rotating shaft 153: screw
154: gear unit 155: drive motor
160: contaminated water pipe 161: sludge return line
170: effluent pipe 171: effluent wear
180: gas discharge pipe 190: sand filter
191: adsorption means 192: upward movement sewage
193: phosphorus-bound solids 194: microbial membrane
195: nitrogen gas 200: control unit
201: discharge water 202: level signal
203: effluent flow rate signal 204: contaminated water flow rate signal
205: influent nitrate nitrogen level signal 206: effluent nitrate nitrogen level signal
207: contaminated water 208: carbon source
209: control signal 210: supply device
220: level sensor 230: effluent flow rate sensor
240: pollutant flow rate sensor 250, 260: sample water flow
270: nitrate nitrogen sensor

Claims (8)

delete delete Physical and primary secondary treated wastewater is used as influent to remove nutrients remaining in the influent in the same reactor, and the reactor is a medium capable of simultaneous physicochemical treatment for phosphorus removal and biological treatment for nitrogen removal. A simultaneous phosphorus and nitrogen removal system of sewage water with a filter,
The physicochemical treatment is performed by dissolving the dissolved phosphorus contained in the influent into the media filter, and the biological treatment is performed by removing nitrogen nitrate nitrogen contained in the influent by denitrifying microorganisms formed on the surface or in the pores of the media filter. And the media filter comprises sand media coated with hydrous ferric oxides, wherein the adsorption is effected through contact with the coated iron hydroxide and used by the denitrifying microorganisms. A simultaneous removal of phosphorus and nitrogen in the wastewater, characterized in that the carbon source is supplied with the influent. The method of claim 3,
The iron hydroxide is at least one member selected from the group consisting of amorphous iron hydrate, ferrihydrite, geiteite, lepidocrocite and hematite. Phosphorus and nitrogen simultaneous removal system. The method of claim 3,
The carbon source is a simultaneous removal of phosphorus and nitrogen in the wastewater, characterized in that methanol or ethanol. The method of claim 3,
And the media filter is operated in an oxygen free environment. The method of claim 3,
The reaction tank is a dispersion pipe installed in the lower portion of the reaction tank, an air lift pipe installed vertically to the reaction tank, a contaminated water chamber installed in the upper portion of the air lift tube, a contaminated water pipe connected to the contaminated water chamber, discharge water installed in the upper portion of the reaction tank A pipe and a gas discharge pipe installed at an upper end of the reactor,
The inflow water is injected upward from the dispersion pipe to pass through the sand filter, and the treated water from which phosphorus and nitrogen are removed is discharged to the discharge pipe, the generated gas is discharged to the gas discharge pipe, and the sand filter is the air lift. The contaminated water separated by rising to the contaminated water chamber through a pipe is discharged to the contaminated water pipe and the raised sand media is dropped and reused, characterized in that the waste water is removed and reused. The method of claim 7, wherein
And a control unit for controlling the carbon source supply based on the carbon and nitrogen levels in the discharged water discharged to the discharged water pipe.

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