KR102015603B1 - Nitrogen removal system for sewage and wastewater comprising nitrogen - Google Patents

Abstract

The nitrogen removal system contained in the high concentration ammonia nitrogen wastewater of the present invention includes a reactor for removing ammonia nitrogen contained in a high concentration ammonia nitrogen wastewater including an anaerobic digestion leachate, an anaerobic ammonia oxidizing bacterium in the wastewater introduced from the reactor and Media with aerobic ammonia oxidizing bacteria attached to the reactor as a circulating water and the remaining waste water includes a cyclone unit for discharging as treated water, and a sulfated denitrifier for removing nitrate nitrogen from the treated water discharged from the cyclone unit. Is connected to a collecting pipe for collecting wastewater discharged from the reactor, a plurality of distribution nozzles connected to discharge the wastewater stored in the collection tank, and a plurality of distribution nozzles, each of which is connected to a plurality of distribution nozzles, each of which controls a supply amount and a pressure of the wastewater. Difference in specific gravity due to vortex of wastewater introduced through distribution nozzle Sulfuric acid is treated with a plurality of cyclones and a plurality of cyclones, which are separated into circulating water containing media with high specific gravity anaerobic ammonia oxidant granules and aerobic ammonia oxidizing bacteria, and treated water containing low specific gravity suspended microorganisms. A plurality of overflow pipes each connected to discharge to the denitrification, a plurality of underflow pipes each connected to discharge the circulating water containing the anaerobic ammonia oxide granules separated from the plurality of cyclones and the media with aerobic ammonia oxides to the reactor It includes.

Description

Nitrogen removal system for sewage and wastewater containing nitrogen}

The present invention relates to a nitrogen removal system contained in a high concentration of ammonia nitrogen wastewater, the domestic priority claim to the Republic of Korea Patent Application No. 10-2016-172345 (application date December 16, 2016), the C / N ratio is low It is a technique for treating high concentration ammonia nitrogen wastewater containing ammonia nitrogen. More specifically, by using a cyclone, the anaerobic ammonia oxidizing bacteria granules, which are large specific gravity microorganisms, and the media with aerobic ammonia oxidizing bacteria attached to the reactor are recovered, and the suspended microorganisms with small specific gravity are selectively discharged into circulating or treated water. The present invention also relates to a nitrogen removal system that can increase the total nitrogen treatment efficiency more economically than conventional anaerobic ammonia oxidation technology by removing nitrate nitrogen generated (remaining) in the ammonia oxidation process by anaerobic ammonia oxidizing bacteria.

Anaerobic digestion equipment that produces energy by converting organic matter contained in high-concentration organic waste such as sludge discharged from sewage treatment plant, organic waste such as livestock manure into methane gas has the advantages of reducing waste and producing energy, As the ammonia nitrogen contained therein also flows into the sewage treatment plant main stream as it is eluted, there is a problem of increasing the nitrogen load.

In order to solve this problem, it is necessary to increase the treatment capacity of the main process of the sewage treatment plant or to reduce the nitrogen load flowing into the sewage treatment plant through side stream treatment. However, in most sewage treatment plants, there is no room on the site, and it is not easy to increase treatment capacity because enormous costs are required to increase the sewage treatment capacity.

On the other hand, the method of treating nitrogen directly in the reflux water containing the anaerobic digestion solution is simpler and more economical in terms of cost than the expansion of the present treatment capacity.

Nitrogen treatment of the reflux water has a problem that it is difficult to reduce the capacity of the treatment facility by conventional nitrification-denitrification technology. Globally, various technological developments have been developed to solve this problem since the late 1990s. Recently, facilities for removing high concentration ammonia nitrogen (NH ₄ -N) have been installed in Europe, USA and Japan.

ANAMMOX is a new technology that can remove ammonia nitrogen (NH ₄ -N) that is drawing attention.

Anamox technology is carried out by Anamox bacteria (anaerobic ammonia oxidizing bacteria), an independent nutrient that synthesizes cells from inorganic carbon using ammonia (NH ₄ ⁺ ) and nitrous acid (NO ₂ ⁻ ) as substrates in anaerobic conditions. The reaction is also called anaerobic AMMonium OXidation or Deammonification.

Anamox technology is an independent nutrient reaction that generates nitrogen gas by reacting NH ₄ ⁺ as electron donor and NO ₂ ^- as electron acceptor in anaerobic state.It requires much less oxygen for nitrification than denitrification and denitrification. There is no need for the supply of organic carbon sources, so the treatment costs are greatly reduced.

In order to remove the nitrogen component by the anamox reaction, the concentration of ammonia nitrogen (NH ₄ -N) and nitrite nitrogen (NO ₂ -N) should be introduced into the anamox reactor at a ratio of about 50:50.

That is, aerobic ammonia oxidation converting ammonia nitrogen (NH ₄ -N) present in the raw water to be treated by aerobic ammonia oxidizing bacteria (AOB) into nitrite nitrogen (NO ₂ -N) in the aerobic state ( Aerobic ammonium OXidation or Nitritation must be premised.

In addition, ammonia (NH ₄ ⁺⁾ and nitrous acid as shown in scheme below (NO ₂ ^-) is 1: it must be present in a 1.32 molar ratio to be only about 50 ~ 55% conversion to a nitrite nitrogen forms part of this nitrite Chemistry It is called (Partial Nitritation).

The nitrite and anamox reactions are as follows.

Nitrite-forming ^{_{reaction: 2NH 4 + + 1.5O 2 →}} NH4 + + NO 2 - + H 2 O + 2H +

Ana Comox _{^{reaction: 1.0NH 4 + + 1.32NO 2 -}} + 0.066HCO 3 - + 0.13H +

^{_{→ 1.02N 2 + 0.26NO 3 - +}} 0.066CH 2 O 0. _{5 N 0 .15 (biomass) +} 2.03H 2 O

Wherein 0.066CH ₂ O _{0 . 5} N _{0 .15} (biomass) represents Anamox bacteria.

By applying Anamox technology to remove the ammonia nitrogen from the return water, the initial investment, operating cost, land area, energy consumption, and CO ₂ emissions are all reduced by more than 30 ~ 60% compared to the existing ammonia nitrogen treatment method.

The first Anamox technology uses a nitrite reactor that converts half of the ammonia nitrogen present in the wastewater to nitrite nitrogen (partial nitrous oxide) and an anoxix reactor that treats it by anamok bacteria (anaerobic ammonia oxide). It was applied to a demonstration facility in the form of a so-called two stage or two tank system reactor, which was applied in two separate applications. Since then, partial nitrous oxidation and anamox reactions have been developed in the form of a one stage or one tank system reactor. Compared to the two-chamber technology, the one-tank anamox technology does not require a precipitation tank, and there is an advantage in that the reaction tank can be drastically reduced because partial nitrification and anamox reactions are performed in a single reaction tank. Therefore, because of the economic advantages that can reduce the initial investment cost of the installation site, piping, pumps, etc. Recently, the one tank type Anamox technology has been applied.

The single tank Anamox technology is characterized by simultaneous partial nitrification and anamox reactions in a single reactor. Therefore, aerobic ammonia oxidizing bacteria and anamox bacteria (anaerobic ammonia oxidizing bacteria) are present in an appropriate ratio in the reactor, and other microorganisms must be removed from the reactor by washing out of the reactor or inhibiting activity. To achieve this, operation control using various operating factors such as pH, SRT, DO, temperature, free ammonia (FA) and free nitrous acid (FNA) is required.

In particular, Anamox bacteria (anaerobic ammonia oxidizing bacteria) should be maintained in the reactor without loss after planting once, because of the very slow growth rate, while nitrite oxidizing bacteria (Nitrite Oxidizing Bacteria, NOB) should be selectively discharged. In order to achieve this, in the case of a two-chamber process, a precipitation tank is installed at the rear part of the partial nitrous oxidation tank and the anamox reaction tank, and the anamok bacteria (anaerobic ammonia oxidizing bacteria) are recovered through the return.

In the case of a single tank process, the reactor is applied in the form of a tower upflow reactor using an anamorphic bacterium (anaerobic ammonia oxide) that separates treated water and sludge by applying an immersion membrane or forms granules. The anaerobic ammonia oxide granules can be used as a reactor to lose other suspended microorganisms during rapid precipitation. However, these methods increase the site for the settling tank, increase the membrane installation and operation costs, and increase the cost of the facility because the tower-type reactor requires a lining plate such as a slope plate so as not to lose the granules to the outside. There is this. Therefore, more economical technology is needed to solve this problem.

Even though ammonia nitrogen is treated by the anamox reaction, about 10% of the nitric acid nitrate is removed as a product. Therefore, in order to increase the total nitrogen removal efficiency, a subsequent process is required to completely remove the remaining nitrogenous nitrate. In general, nitrate nitrogen can be removed by denitrification by heterotrophs. However, in the case of anaerobic digestion, since most organic matter is consumed as biogas and the residual amount is not high, additional external carbon sources such as methanol must be supplied, thereby increasing sludge generation. Such a method will lead to an increase in operating costs, and thus a more economical method of treating residual nitrate nitrogen is required.

Republic of Korea Patent No. 1288495 (Registration date July 16, 2013) Republic of Korea Patent No. 1288503 (Registration Date July 16, 2013) Republic of Korea Patent No. 1430722 (Registration Date 08/08/2014) Republic of Korea Patent Registration No. 0586535 (Registration Date May 26, 2006)

The present invention has been made to solve the above-described problems of the prior art, the object of the present invention relates to a method for operating more economically and stably without the installation of a set tank Anamox process without settling tank or membrane filtration. In other words, it is important to maintain aerobic ammonia oxidizing bacteria and anamox bacteria (anaerobic ammonia oxidizing bacteria) well in the reaction tank, and nitrite oxidizing bacteria should be discharged to the outside of the reaction tank. For this purpose, the medium is added to attach and grow aerobic ammonia oxidizing bacteria, which are then recovered to the reactor using a cyclone together with anaerobic ammonia oxidizing granules. Low-density suspended microorganisms that do not adhere to the media or anaerobic ammonia oxidizing granules are selectively discharged into circulating or treated water. In addition, by removing anaerobic ammonia nitrogen produced by the anaerobic ammonia oxidizing bacteria (remaining) nitrate nitrogen to provide a nitrogen removal system that can increase the total nitrogen treatment efficiency more economically than conventional anaerobic ammonia oxidation technology.

In order to achieve the above object, the nitrogen removal system contained in the high concentration ammonia nitrogen wastewater of the present invention includes a reactor for removing ammonia nitrogen contained in the high concentration ammonia nitrogen wastewater including an anaerobic digestion effluent, and the wastewater introduced from the reactor. Media with anaerobic ammonia oxidant granules and aerobic ammonia oxidants was recovered to the reactor as circulating water and the remaining waste water was treated as a cyclone unit to remove nitrate nitrogen from the treated water discharged from the cyclone unit. The cyclone unit includes a sump for collecting wastewater discharged from the reactor, a plurality of distribution nozzles connected to discharge the sewage and wastewater stored in the collection tank, and a plurality of distribution nozzles each connected with valves for controlling supply and pressure of the wastewater. Connected to a pipe and introduced through the plurality of distribution nozzles A plurality of cyclones and a plurality of cyclones for separating the wastewater into the circulating water containing the median attached to aerobic ammonia oxidizing bacteria granules and the aerobic ammonia oxidizing bacteria and the treated water containing the low specific gravity floating microorganisms by the difference of the specific gravity by the vortex A plurality of overflow pipes each connected to discharge the treated water separated from the cyclone to the desulfurization denitrifier, and circulating water containing anaerobic ammonia oxidant granules separated from the plurality of cyclones and media with aerobic ammonia oxidized bacteria discharged to the reactor And a plurality of underflow pipes each connected to one another.

In the system of the present invention, the sulfated denitrification apparatus includes a storage tank containing the treated water discharged from the overflow pipe, a denitrification tank containing the treated water discharged by removing the microorganisms sedimentable from the storage tank, and the denitrification tank filled with the treated water. It may include a desulfurization denitrification carrier for removing the nitrate nitrogen and a denitrification blower for supplying air for backwashing the desulfurization denitrification carrier.

In this case, a circulating pump may be connected to the denitrification tank to remove nitrate nitrogen by the sulfated denitrification carrier to reflow the treated water raised to the upper portion of the denitrification tank to the bottom.

In the system of the present invention, the cyclone unit may further include a reservoir for storing the treated water discharged from each of the overflow pipes.

In this case, one end of the overflow pipe may be connected to the upper outlet of the cyclone, and the other end thereof may be bent downward to be connected to the reservoir disposed at the bottom of the sump.

In the system of the present invention, the cyclone is connected to the dispensing nozzle by a connecting pipe, and the connecting pipe is provided with a valve to adjust the supply amount and pressure of the waste water.

In the system of the present invention, some of the plurality of overflow pipes may discharge a portion of the treated water containing suspended microorganisms separated from the plurality of cyclones as circulating water to the reactor.

According to the present invention embodied by the above means, since the ammonia nitrogen of the high concentration ammonia nitrogen wastewater containing the anaerobic digestion lysate is removed by an anoxix reaction in the reactor, the nitrate nitrogen is continuously removed by the sulfate denitrifier. When the Anamox process is applied alone, the remaining nitrogen nitrate can be completely treated, which significantly lowers the total nitrogen concentration of the treated water, and the aerobic ammonia oxidized bacteria attached to the media and anaerobic ammonia oxidized bacteria attached to the media by the cyclone unit. After separation by tea, the resultant is recovered in a reaction tank, and nitrite oxide is discharged.

This prevents the loss of aerobic ammonia oxidizing bacteria and Anamox bacteria (anaerobic ammonia oxidizing bacteria) and controls the excessive conversion of nitrite oxidizing nitrogen to nitrite nitrogen by preventing the release of nitrite oxidizing bacteria. There is a very useful effect that can lead to stable operation.

1 is a process diagram showing the overall process of the nitrogen removal system contained in the high concentration ammonia nitrogen wastewater according to an embodiment of the present invention.
Figure 2 is a perspective view showing three-dimensional cyclone unit according to an embodiment of the present invention.
3 is a cross-sectional view showing a cross section of a cyclone unit according to an embodiment of the present invention.
Figure 4 is an operation showing the operation of the cyclone unit according to an embodiment of the present invention.
5 is an image photographing the wastewater according to an embodiment of the present invention
Figure 6 is an image of the circulation water of the underflow pipe according to an embodiment of the present invention.
7 is an image of the process water of the overflow pipe according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings in order to fully understand the present invention.

Embodiment of the present invention may be modified in various forms, the scope of the invention should not be construed as limited to the embodiments described in detail below. This embodiment is provided to more completely explain the present invention to those skilled in the art.

Therefore, the shape of the components, etc. represented in the drawings may be exaggerated to emphasize a more clear description. It should be noted that the same configuration in each drawing is shown with the same reference numerals. In addition, the detailed description about the function and structure of the well-known technique which determine that the summary of this invention may be unnecessarily obscured is abbreviate | omitted.

Nitrogen removal system contained in the high concentration ammonia nitrogen wastewater of the present invention, the reactor 100 for removing the ammonia nitrogen contained in the high concentration ammonia nitrogen wastewater containing the anaerobic digestion effluent, the wastewater introduced from the reactor (100) Anaerobic ammonia oxidizing bacteria granules and aerobic ammonia oxidizing bacteria attached to the media and suspended microorganisms to separate the cyclone unit 200 discharged to the circulating and treated water, sulfated to remove the nitrate nitrogen of the treated water discharged from the cyclone unit And a denitrifier 400.

Reactor 100 is to remove the ammonia nitrogen contained in the high concentration ammonia nitrogen wastewater containing the anaerobic digestion, the reactor 100 is a reactor 110 containing a high concentration ammonia nitrogen wastewater containing the anaerobic digestion , A blower 120 for supplying air to the microacid substrate 122 installed in the reaction tank 110, a circulating water pump 130 for discharging wastewater from which the ammonia nitrogen is removed from the reaction tank 110 to the cyclone unit 200. It includes.

The reactor 110 is formed in a rectangular or cylindrical shape and contains a high concentration of ammonia nitrogen wastewater containing an anaerobic digestion leachate containing a high concentration of ammonia nitrogen. The reactor is filled with media containing ⓐ suspended microorganisms, ⓑ anaerobic ammonia oxidizing granules, and ⓒ aerobic ammonia oxidizing bacteria. Here, the airborne microorganism may include aerobic ammonia oxidizing bacteria, aerobic nitrite oxidizing bacteria, aerobic heterotrophs, anaerobic heterotrophs, and anaerobic ammonia oxidizing bacteria (before granule formation).

The media is to act to keep the amount of microorganisms in the reactor 110 stable. Such media are formed to a size of 0.5 mm or less, and are not sensitive to pH, temperature and UV ultraviolet rays, and are not sensitive to mechanical shear deformation or biological or chemical effects. Not only has good durability, but also has good sedimentation and fixing ability. In addition, the media has a sludge adhesion capacity of 5 kg / kg-media or more, and can hold and maintain sludge more than five times the amount of suspended sludge. In addition, aerobic ammonia oxidizing bacteria adhere to the surface of the media.

Anaerobic ammonia oxidant granules differ from aerobic ammonia, aerobic nitrite oxidants, aerobic heterotrophs and anaerobic heterotrophs, which have a low ability to form flocs, while the anaerobic ammonia oxidants are entangled with each other. It grew in form. Anaerobic ammonia oxidized bacteria granules are filled in the reactor 110 in the form of granules having a size of approximately 0.1 to 3 mm.

The blower 120 is to supply air to the microacid substrate 122 installed on the inner bottom of the reaction tank 110, the high concentration containing the anaerobic digestion desorption liquid in the reaction tank 110 by the air supplied from the blower 120 Ammonia nitrogen wastewater is subject to aerobic conditions where only nitrous oxide occurs.

The circulating water pump 130 is installed inside the reaction tank 110 to remove the ammonia nitrogen from the wastewater containing the suspended microorganism, anaerobic ammonia oxidizing bacteria granules and aerobic ammonia oxidizing bacteria attached to the cyclone unit 200. Discharge it. The cyclone unit 200 is controlled by the circulation water pump 130, the inflow amount and internal pressure of the waste water.

The cyclone unit 200 separates the median and suspended microorganisms to which anaerobic ammonia oxidizing bacteria granules and aerobic ammonia oxidizing bacteria from sewage and wastewater introduced from the reactor 100 are separated by the difference in specific gravity due to vortices in the form of circulating water and treated water. Discharge. 2 and 3, the cyclone unit is a collection tank 210 for collecting wastewater discharged from the reactor 100, a plurality of distribution nozzles 220 connected to discharge the wastewater stored in the collection tank 210, a plurality The wastewater discharged from the distribution nozzle 220 of the gas is separated into median and floating microorganisms attached to anaerobic ammonia oxidizing bacteria granules and aerobic ammonia oxidizing bacteria by the difference in specific gravity due to vortex, and discharged in the form of circulating water and treated water. Cyclone 230, overflow pipe 240 for discharging treated water including suspended microorganisms respectively discharged from a plurality of cyclones to the desulfurization denitrifier 400, treated water discharged from each overflow pipe 240 The storage tank 250 for storing the circulated water including the median attached to the anaerobic ammonia oxidizing bacteria granules and aerobic ammonia oxidizing bacteria discharged from each of the plurality of cyclones 230 to the reactor 100 Which comprises underflow pipe 260.

Here, a part of the plurality of overflow pipes 240, the reactor 100, not the sulfated denitrifier 400 as a circulating water using a part of the treated water containing the airborne microorganisms separated from the plurality of cyclones 230. To be reflowed.

That is, some of the plurality of overflow pipes 240 are connected to the reactor 100.

The sump 210 is formed in a cylindrical shape to collect wastewater, and an inlet 212 is formed at an upper portion of the sump 210 to introduce wastewater discharged from the reactor 100.

Dispensing nozzle 220 is composed of a plurality, for this purpose, the distribution nozzle 220 is radially connected in the central portion of the periphery of the sump 210 to discharge the waste water in the sump 210 is constant.

The cyclone 230 is connected to each of the plurality of distribution nozzles 220 to separate and discharge the median and suspended microorganisms to which the anaerobic ammonia oxidizing bacteria granules and aerobic ammonia oxidizing bacteria contained in the waste water are separated by specific gravity. Referring to FIG. 3, the cyclone 230 includes an upper cylindrical portion 232 and a lower cone portion 234. An upper outlet 233 is formed at the center of the upper end of the cylindrical portion 232, and the cone portion is formed. The lower outlet 235 is formed at the center of the lower end of the 234. And a supply port 236 is formed on the upper side of the cylindrical portion 232 is connected through the distribution nozzle 220 and the connection pipe 237, the waste water from which the ammonia nitrogen is removed through the supply port 236 Supplied. In addition, the connection pipe 237 is provided with a valve 238 to control the supply amount and pressure of the waste water, but such a valve is preferably implemented as a ball valve to finely control the supply amount and pressure of the wastewater, According to the present invention, a variety of valves capable of adjusting the supply amount and the pressure of the wastewater may be implemented. In addition, a plurality of protrusions 239 are formed on the inner surface of the cyclone 230 at predetermined intervals along the circumference and the axial direction, so that the sludge attached to the surface of the anaerobic ammonia oxidizing bacteria granule is detached and at the same time in the wastewater by the downturn flow. Separate and descend.

The overflow pipe 240 is connected to the upper outlet 233 of the plurality of cyclones 230, respectively, and discharges the treated water containing the floating microorganisms into the storage tank 250. One end of the overflow pipe 240 is It is connected to the upper outlet 233 of the cyclone 230 and the other end is gently curved downwards is connected to the open upper portion of the reservoir (250).

Here, some of the plurality of overflow pipes 240 are connected to the pipe and the upper portion of the reactor 110 of the reactor 100 opened.

The reservoir 250 stores the treated water discharged from each overflow pipe 240, and the reservoir 250 is formed in a cylindrical shape with an open upper portion to store the treated water discharged from the overflow pipe 240. The outlet center 252 is formed at the lower center to discharge the treated water to the sulfated denitrifier 400. And the reservoir 250 is disposed in the lower portion of the sump 210, in which the sump 210 is supported by a plurality of first brackets 254 installed to intersect at the top center of the reservoir 250 is fixed. In addition, a plurality of second brackets 256 are radially installed at a lower portion of the outer periphery of the storage tank 250 to support and fix the lower portions of the plurality of cyclones 230, respectively. In addition, the reservoir may further include a drain valve 258 installed at one side of the lower side to discharge the treated water.

The underflow pipe 260 is connected to each of the lower outlets 235 of the plurality of cyclones 230 to discharge the circulating water containing the media to which the anaerobic ammonia oxidizing bacteria granules and aerobic ammonia oxidizing bacteria are attached. 1 and 3, one end of the underflow pipe 260 is connected to the lower outlet 235 of the cyclone 230 and the other end is bent and connected to the open upper portion of the reactor 110.

The desulfurization denitrifier 400 removes the nitrate nitrogen contained in the treated water collected in the primary treatment tank 300 after being discharged from the cyclone unit 200. Retaining tank 410, denitrification tank 420 containing the treated water discharged by the removal of microorganisms sedimentable in the storage tank 410, sulfuric acid filled in the denitrification tank 420 to remove the nitrate nitrogen of the treated water A denitrification carrier 430 and a denitrification blower 440 for supplying air to the denitrification tank 420.

The storage tank 410 is to be treated by the treated water pump 450, the treated water in the primary treatment water tank 300, such a storage tank 410 can constantly flow the treated water into the denitrification tank 420. And, it is to reduce the concentration of solids flowing into the denitrification tank 420 by precipitating microorganisms (large specific gravity microorganisms) that can be precipitated in the treated water.

The denitrification tank 420 is formed in a rectangular cylindrical shape or a cylindrical shape to contain the treated water discharged by removing the microorganisms that can be settled in the storage tank 410.

Sulfation denitrification carrier (pellet, 430) is filled in the denitrification tank 420 for the maintenance and pH adjustment of the desulfurization denitrification microorganism, such a desulfurization denitrification carrier 430 is used in the treated water by using a desulfurization denitrification reaction Nitrate nitrogen contained is removed by denitrification. That is, about 10% of the nitrate nitrogen is generated in the treated water that has passed through the cyclone unit 200, compared to the nitrogen concentration treated in the reactor 100, and the nitrate nitrogen is sulfated and denitrified by the sulfated denitrification carrier 430. To remove it.

The denitrification blower 440 is to supply air to the lower part of the denitrification tank 420, and the air supplied from the denitrification blower 440 is installed for back washing of the denitrification tank.

In other words, the pores are blocked due to the growth of the denitrified microorganisms attached between the carriers and intermittently backwashing to prevent the channeling phenomenon of the carrier and the wastewater being moved to one side without evenly contacting.

In addition, the desulfurization denitrifier 400 further includes a circulation pump 460 for removing nitrate nitrogen by the desulfurization denitrification carrier 430 to reflow the treated water raised to the upper portion of the denitrification tank 420 to the bottom. It may include.

As described above, the treated water from which the nitrate nitrogen is removed by the sulfated denitrifier 400 is discharged through the secondary treated water tank 500.

The overall operation and effects of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the reactor 110 of the reactor 100 is filled with media with anaerobic ammonia oxidizing bacteria granules and aerobic ammonia oxidizing bacteria and suspended microorganisms, and the reactor 110 has a high concentration of ammonia nitrogen wastewater containing an anaerobic digestion leachate. Is continuously introduced.

Subsequently, a part of ammonia nitrogen is supplied by aerobic ammonia oxidizing bacteria contained in the sewage and waste water by supplying an appropriate amount of air into the reaction tank 110 through the microacid substrate 122 by the operation of the blower 120. Is changed.

And stop the operation of the blower 120 to stop the supply of air into the reaction tank 110, the interior of the reaction tank 110 to achieve the anaerobic conditions, after the operation of the stirring blade (not shown) to include anaerobic digestion desorption liquid When the highly concentrated ammonia nitrogen wastewater is stirred in the reactor 110, the ammonia nitrogen and the nitrite nitrogen are oxidized to an anaerobic ammonia oxidation reaction (anamox reaction) by anaerobic ammonia oxidizing bacteria granules and converted into nitrogen gas.

As such, the wastewater from which ammonia nitrogen has been removed contains media and airborne microorganisms to which anaerobic ammonia oxidant granules and aerobic ammonia oxidants are attached.

Figure 5 (a) is an image taken by capturing the wastewater treated in the above-described process in a measuring cylinder, (b) is an image taken by magnifying the sewage and wastewater contained in the measuring cylinder with a microscope. In Figure 5 (b) anaerobic microorganism Anammox bacteria (anaerobic ammonia oxidizing bacteria) is represented by a red circle, suspended microorganisms are represented by a blue circle.

Sewage / wastewater containing these components is discharged to the cyclone unit 200 by the operation of the circulating water pump 130.

Next, the wastewater introduced into the sump 210 through the inlet 212 of the cyclone unit 200 is ejected to each cyclone 230 through a plurality of distribution nozzles 220, and is discharged into the cyclone 230 The wastewater descends to the cone portion 234 while turning along the cylindrical portion 232 and rises to the center portion.

At this time, the anaerobic ammonia oxidizing bacteria granules hit the protrusions 239 of the cyclone 230, the sludge is detached and then separated by a descending turn flow, and the median attached to the aerobic ammonia oxidizing bacteria is hit by the protrusions 239 and the sludge After detaching, it is separated and lowered by its own weight. That is, the median to which the specific gravity of the anaerobic ammonia oxidizing bacteria granules and aerobic ammonia oxidizing bacteria contained in the wastewater introduced into the cyclone 230 is lowered by the downward turning flow (solid arrow in FIG. 4) and the lower outlet 235. After passing through the underflow pipe 260 is passed back to the reactor 110 of the reactor 100 in the form of circulating water. FIG. 6 is a photograph of the circulating water discharged through the underflow pipe 260 in a measuring cylinder.

On the other hand, the floating microorganisms having a small specific gravity are stored in the storage tank 250 through the overflow pipe 240 through the upper discharge port 233 by the rising swirl flow (dashed arrow in FIG. 4) rising to the center of the cyclone 230. After the first treatment tank 300 is added in the form of treated water. FIG. 7 is a photographed image of the treated water discharged through the overflow pipe 240 in a measuring cylinder.

Here, a part of the treated water is not stored in the reservoir 250 but is fed back into the reactor 100 as circulating water.

As described above, the treated water treated in the primary treated water tank 300 is introduced into the storage tank 410 by the operation of the treated water pump 450.

The treated water from which the microorganism having a large specific gravity precipitated and removed from the storage tank 410 is introduced into the lower portion of the denitrification tank 420 filled with the sulfated denitrification carrier 430.

At this time, the nitrate nitrogen remaining in the treated water is removed by the sulfated denitrification reaction of the sulfated denitrification carrier 420 filled in the denitrification tank 410.

As such, the treated water from which the nitrate nitrogen is removed by the sulfated denitrifier 400 is discharged to the secondary treated water tank 500.

Optionally, the treated water raised to the upper portion of the sulfated denitrification carrier 430 by removing the nitrate nitrogen by the sulfated denitrifier 400 is re-introduced to the lower portion of the denitrification tank 420 by the circulation pump 460. Can be.

In addition, by operating the denitrification blower 440, the air may be supplied to the inside of the denitrification tank 420 to perform intermittent backwashing.

Embodiments of the present invention described above are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom.

Therefore, it will be understood that the present invention is not limited to the forms mentioned in the above detailed description.

Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims. It is also to be understood that the present invention includes all modifications, equivalents, and substitutes within the spirit and scope of the invention as defined by the appended claims.

100 reactor 110 reactor
120: blower 130: circulating water pump
200: cyclone unit 210: water tank
220: dispensing nozzle 230: cyclone
240: overflow pipe 250: reservoir
260: underflow pipe 300: primary treatment tank
400: sulfated denitrifier 410: storage tank
420 denitrification tank 430 sulfated denitrification carrier
440: denitrification blower 500: secondary treatment tank

Claims (5)

A reactor for removing ammonia nitrogen contained in a high concentration of ammonia nitrogen wastewater containing an anaerobic digestion leachate, and the media attached to the anaerobic ammonia bacteria granules and the aerobic ammonia oxide bacteria in the wastewater introduced from the reactor are recycled to the reactor as circulating water. And the remaining waste water includes a cyclone unit for discharging as treated water, and a sulfated denitrifier for removing nitrate nitrogen from the treated water discharged from the cyclone unit.
The cyclone unit is a collection pipe for collecting wastewater discharged from the reactor, a plurality of distribution nozzles connected to discharge the wastewater stored in the collection tank, and a connection pipe having valves for controlling the supply amount and pressure of the wastewater to the plurality of distribution nozzles, respectively. A plurality of separated and separated wastewaters are separated into circulating water containing high specific gravity anaerobic ammonia bacteria granules and median with aerobic ammonia oxidation bacteria and treated water containing low specific gravity floating microorganisms. A cyclone, a plurality of overflow pipes each connected to discharge the treated water separated from the plurality of cyclones to a sulfate denitrification, and an anaerobic ammonia oxidized granule separated from the plurality of cyclones and a media attached to aerobic ammonia oxidized bacteria. Multiple words each connected to discharge circulating water to the reactor Including a double flow pipe,
The desulfurization denitrification unit includes a storage tank containing the treated water discharged from the overflow pipe, a denitrification tank into which treated water from which microorganisms with a large specific gravity are removed is introduced, and a denitrification tank filled with the denitrification tank to remove nitrate nitrogen from the treated water. A nitrogen removal system contained in a high concentration ammonia nitrogen wastewater, comprising a desulfurization denitrification carrier and a denitrifier blower for supplying air for backwashing the desulfurization denitrification carrier. The method according to claim 1,
The denitrification tank has a nitrogen removal system contained in the highly concentrated ammonia nitrogen wastewater, characterized in that a circulating pump for removing the nitrate nitrogen by the sulfated denitrification carrier and reflowing the treated water raised to the upper portion of the denitrification tank to the bottom. . The method according to claim 1,
The cyclone unit, the nitrogen removal system contained in the high concentration ammonia nitrogen wastewater, characterized in that it further comprises a reservoir for storing the treated water discharged from each overflow pipe. The method according to claim 3,
One end of the overflow pipe is connected to the upper outlet of the cyclone, and the other end is bent downward to be connected to the reservoir arranged at the bottom of the sump, the nitrogen removal system contained in the high concentration ammonia nitrogen wastewater. The method according to claim 1,
Some of the plurality of overflow pipes, the nitrogen removal system contained in the high concentration ammonia nitrogen waste water, characterized in that a part of the treated water containing suspended microorganisms separated from the plurality of cyclones to discharge as a circulating water to the reactor.

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