JP5451282B2 - Denitrification device and biological nitrification denitrification device - Google Patents

Description

  The present invention relates to a denitrification apparatus and a biological nitrification denitrification apparatus that treat nitrogen-containing wastewater using a biological treatment method.

  Nitrogen contained in wastewater is a cause of eutrophication, and many techniques for removing nitrogen in wastewater have been developed. Biological nitrogen removal methods for removing nitrogen in wastewater using microorganisms, which are one of these, have also been widely used in the past. Progressive feeding method, AO (Anaerobic-Oxic) method, A2O (Anaerobic-Anogic) Many processes have been proposed, including cyclic methods such as -Oxic) and UASB (Upflow Analytic Sliding Blanket) -DHS (Downflow Hanging Sponge Cube) method. The biological nitrogen removal method uses a nitrification process that oxidizes ammonia nitrogen in wastewater to nitrite or nitrate nitrogen by nitrifying bacteria that are aerobic bacteria, and denitrifying bacteria that are anaerobic bacteria. It consists of a denitrification process in which nitrate and nitrite nitrogen are reduced to nitrogen, and various types of reactors have been developed.

  In order to downsize a biological nitrification denitrification apparatus, it is important to downsize the denitrification tower and the nitrification tower. In order to reduce the size of the denitrification tower and nitrification tower, it is important to be able to operate the denitrification tower and nitrification tower stably. The tower and nitrification tower become larger. In addition, improving the efficiency of the denitrification reaction and nitrification reaction also leads to the miniaturization of the biological nitrification denitrification apparatus. There have been some proposals related to these.

  For example, a technique for improving the denitrification reaction efficiency by introducing a plastic floating carrier to which denitrifying bacteria easily adhere in a denitrification tank has been proposed. Furthermore, it is assumed that the nitrification denitrification efficiency can be improved and the biological nitrification denitrification apparatus can be reduced by introducing a fixed carrier in which nitrifying bacteria are comprehensively immobilized with polyethylene glycol into the nitrification tank (see, for example, Patent Document 1).

  In many cases, granular sludge containing denitrifying bacteria is used in the denitrification tower, and the denitrification process is performed by floating the granular sludge with the rising flow of waste water. When granule sludge is destroyed and becomes smaller, or the generation amount of decomposition gas generated by decomposition of ammonia, organic matter, etc. in the denitrification tower increases, the generated bubbles adhere to the granule sludge and float the granule sludge. In this case, granule sludge flows out together with the waste water and decreases, so the performance of the denitrification tower decreases. For this reason, the apparatus which collect | recovers the granular sludge which flowed out with the filter and returns granule sludge to a denitrification tower is proposed (for example, refer patent document 2).

JP-A-10-151495 Japanese Patent Laid-Open No. 10-249382

  Needless to say, if the biological nitrification denitrification apparatus can be reduced in size, it can be attached to, for example, a domestic aquarium that keeps goldfish or the like. As described above, in order to downsize a biological nitrification denitrification device, it is important to improve the efficiency of the denitrification reaction and nitrification reaction, and to be able to stably operate the nitrification device and the denitrification device. Efforts such as those found in No. 1 or Patent Document 2 have been made, but this is not always sufficient. Furthermore, in order to reduce the size of biological nitrification denitrification equipment, it is important to improve the process and reduce the number of auxiliary equipment, but so far, such biological nitrification denitrification equipment has been developed. Absent.

  The objective of this invention is providing the denitrification apparatus and biological nitrification denitrification apparatus suitable for size reduction.

The present invention according to claim 1 is a UASB reactor that retains granular sludge and denitrifies nitrogen-containing wastewater, and collects suspended particulate organic matter contained in the nitrogen-containing wastewater. A liquid cyclone to be supplied to the UASB reactor as the nucleus of the granular sludge, and the liquid cyclone has a flow rate at which the nitrogen-containing wastewater can be separated from the suspended particulate organic matter contained in the nitrogen-containing wastewater through a pump. The entire amount of the underflow water of the hydrocyclone is sent to the UASB reactor, and the granular sludge in the UASB reactor is fluidized with the underflow water. includes particulate organic matter, the UASB within the reactor, the suspended particulate organic matter is granular sludge becomes a nucleus formed A denitrification apparatus, characterized by.

The present invention described in claim 2 is the denitrification device according to claim 1, wherein the UASB reactor further comprises a immobilizable sponge carrier denitrifying bacteria inside, the sludge adhered to the sponge carrier Part is peeled off, and in the UASB reactor, the peeled sludge becomes a nucleus and granule sludge grows.

The present invention described in claim 3 accepts nitrogen-containing wastewater including the denitrification device according to claim 1 or 2 and denitrified wastewater discharged from the denitrification device, and nitrifies by nitrifying bacteria. The nitrification device comprises a horizontal thin nitrification reactor having a carrier therein, and when the nitrification reactor is full of water, the waste water in the nitrification reactor is discharged within a short time. The biological nitrification denitrification apparatus includes a batch discharge means for exposing a carrier, and the nitrification apparatus performs nitrification while alternately repeating filling and discharging of waste water.

According to a fourth aspect of the present invention, in the biological nitrification denitrification apparatus according to the third aspect , the batch discharge means is a siphon.

The present invention according to claim 5 is the biological nitrification denitrification apparatus according to claim 3 or 4 , wherein the carrier is a porous zeolite.

The present invention described in claim 6 is a biological nitrification denitrification device for treating nitrogen-containing wastewater stored in a drainage water tank, wherein the biological nitrification denitrification device according to any one of claims 3 to 5 is used. comprising a nitrification denitrification device, a water pump for a nitrogen-containing wastewater savings of water to further continuously water in the liquid cyclone, the denitrification device is installed in the drainage water tank, the nitrification device, the The biological nitrification denitrification apparatus is installed in an upper part of a waste water storage tank, and the batch discharge means returns the nitrified waste water to the waste water storage tank.

According to the first aspect of the present invention, since the suspended particulate organic matter contained in the nitrogen-containing wastewater is recovered, the recovered suspended particulate organic matter is provided with a liquid cyclone that supplies the UASB reactor as the nucleus of the granular sludge. The growth of granule sludge is stabilized and the amount of granule sludge can be maintained at an appropriate amount. Thus stable it is possible to operate the UASB reactor while maintaining a high denitrification performance, it is possible to reduce the size of the UASB reactor.

Liquids cyclone can be device size to be irrespective small, the suspended particulate organic matter concentration, high ability to recover, to sufficiently recover the suspended particulate organic matter in the waste water. Moreover, underflow water of a hydrocyclone is very efficient because it sends the collected suspended particulate organic matter to the UASB reactor and fluidizes the granular sludge in the UASB reactor. Thus, the denitrification apparatus can be reduced in size.

According to the second aspect of the present invention, since the UASB reactor further includes a sponge carrier capable of immobilizing denitrifying bacteria, it can be started up early. In addition, if a part of the sludge adhering to the sponge carrier is peeled off, it grows to become the nucleus of granular sludge like the suspended particulate organic matter, so that the denitrification performance of the UASB reactor is stabilized, and as a result, the UASB reactor is downsized. be able to.

According to the third aspect of the present invention, since the nitrification reactor is horizontal and thin, it is easy to downsize compared to a conventional nitrification tower having a tower structure. Furthermore, when the nitrification reactor is full, it is equipped with a batch discharge means that discharges the wastewater in the nitrification reactor within a short time and exposes the carrier in the nitrification reactor, and the nitrification device repeats filling and discharging of wastewater alternately. However, since the nitrification treatment is performed, the air is naturally aerobic without the air being sent to the nitrification reactor by a blower or the like, and the nitrification reaction proceeds sufficiently. The configuration of the nitrification apparatus is also very simple, and thus the biological nitrification denitrification apparatus can be miniaturized.

According to the fourth aspect of the present invention, since the batch discharge means is a siphon, the structure is simple and the space is not taken, and therefore the biological nitrification denitrification apparatus can be miniaturized.

According to the present invention described in claim 5 , since the support in the nitrification reactor is a porous zeolite, it is excellent in ammonia adsorption ability and can concentrate ammonia in the waste water. As a result, the nitrification reaction can proceed efficiently, and the biological nitrification denitrification apparatus can be reduced in size.

According to the sixth aspect of the present invention, the denitrification device is installed in the drainage water storage tank for storing the nitrogen-containing wastewater, and the nitrification reactor is installed in the upper part of the drainage water storage tank. Therefore, the biological nitrification denitrification apparatus can be miniaturized.

It is a figure showing the schematic structure of biological nitrification denitrification device 1 as a 1st embodiment of the present invention.

  FIG. 1 is a diagram showing a schematic configuration of a biological nitrification denitrification apparatus 1 as a first embodiment of the present invention. The biological nitrification denitrification apparatus 1 is a wastewater treatment apparatus that treats wastewater 5 stored in a water tank 3, a UASB reactor 7 as a denitrification tank, and an SSB reactor 9 (a siphon-type sponge batch reactor) as a nitrification tank. : A circulatory UASB-SSB type biological nitrification denitrification apparatus having Siphon Sponge Batch-Reactor).

  The biological nitrification denitrification apparatus 1 includes a water pump 11, a denitrification apparatus 13 including a UASB reactor 7, and a nitrification apparatus 15 including an SSB reactor 9 as main devices. The waste water 5 stored in the water storage tank 3 is sent to the UASB reactor 7 through the water pump 11, and nitrate nitrogen and nitrite nitrogen in the waste water are reduced to nitrogen by denitrifying bacteria. The waste water treated in the UASB reactor 7 is sent to the SSB reactor 9, where the ammonia nitrogen in the waste water is oxidized into nitrate nitrogen and nitrite nitrogen by nitrifying bacteria. The waste water treated in the SSB reactor 9 is returned again to the water storage tank 3, and the waste water and the treated water are mixed in the water storage tank 3. As described above, the waste water 5 stored in the water tank 3 is treated while circulating the treated water without flowing in the waste water from the outside and flowing out the treated water to the outside.

  The water supply pump 11 is a device that pumps up the waste water 5 in the water storage tank 3 and supplies the waste water to the denitrification device 13, more specifically, to the liquid cyclone 17 constituting a part of the denitrification device 13. The pump 21 is driven to supply water. A strainer 23 for removing foreign matter in the drainage 5 is attached to the suction portion of the pump 21. The strainer 23 is provided to prevent large foreign matter from entering the UASB reactor 7 and obstructing the blockage of the reactor and the fluidization of the granular sludge, and the opening is about 1 mm to 5 mm, for example. Since the water pump 11 needs to ensure a predetermined flow velocity at the inflow portion of the hydrocyclone 17, it is necessary to determine the specifications in consideration of this point. Although the type of the water pump 11 is not particularly limited, it is small and a pump that can be set in the water storage tank 3 such as a submersible pump is preferable in terms of downsizing the biological nitrification denitrification apparatus 1.

  The denitrification apparatus 13 includes a UASB reactor 7 and a liquid cyclone 17 set on the UASB reactor 7, and the UASB reactor 7 and the liquid cyclone 17 are integrated. The UASB reactor 7 is installed in the water storage tank 3 and is located next to the water pump 11. By installing in this way, the number of pipes can be reduced, and the biological nitrification denitrification apparatus 1 can be downsized.

  The UASB reactor 7 is a reactor for reducing nitrate nitrogen and nitrite nitrogen in the waste water 5 to nitrogen, and has a granule sludge 29 containing denitrifying bacteria in a cylindrical reactor body 27. A liquid cyclone 17 is installed on the upper part of the cylindrical reactor body 27, and underflow water is supplied from the liquid cyclone 17. Further, a discharge pipe 31 for sending the denitrified waste water to the SSB reactor 9 is provided at the upper part of the reactor main body 27. A sponge carrier 35 is attached to the inner wall surface 33 below the reactor body 27. As the sponge carrier 35, generally used sponges such as urethane and cellulose can be used. The sponge carrier 35 may not be the inner wall surface 33 below the reactor body 27 as long as the sponge carrier 35 can be attached without impeding the fluidity of the granular sludge 29.

  The liquid cyclone 17 is a device that concentrates and collects the suspended particulate organic matter contained in the wastewater 5, and supplies the collected suspended particulate organic matter to the UASB reactor 7 together with the underflow water that is part of the wastewater 5. The liquid cyclone 17 has an inverted conical portion 39 at the lower portion of the cylindrical portion 37, similarly to a known liquid cyclone, and an inflow pipe 25 connected to the water supply pump 11 is provided on the side surface of the cylindrical portion 37. An upflow pipe 41 is provided at the center of 37, and an extraction pipe 43 for discharging overflow water is connected to the upstream flow pipe 41. A downstream pipe 45 for discharging underflow water is provided below the inverted conical portion 39. The lower end portion of the downstream pipe 45 is located near the bottom surface of the reactor main body 27. The diameter of the cylindrical portion 37 is the same as that of the reactor main body 27, and the cylindrical portion 37 is located on the upper portion of the reactor main body 27 and connected to the reactor main body 27, and the inverted conical portion 39 and the downstream pipe 45 are connected to the reactor main body 27. Located in.

  In the denitrification apparatus 13, the drainage 5 sent from the water pump 11 is sent from the inflow pipe 25 of the hydrocyclone 17 to the cylindrical portion 37 and becomes a swirling flow in the cylindrical portion 37. It goes down. In this process, a part of the waste water 5 descends and is sent to the reactor main body 27 through the downstream pipe 45, and the remaining waste water becomes an upward flow and is sent to the SSB reactor 9 through the upward flow pipe 41 and the extraction pipe 43. The wastewater 5 sent to the hydrocyclone 17 is concentrated with suspended particulate organic matter contained in the wastewater 5 by the action of centrifugal force, and the wastewater containing a large amount of suspended particulate organic matter becomes underflow water and is sent to the UASB reactor 7. It is done. On the other hand, the suspended particulate organic matter contained in the wastewater 5 is recovered, and the wastewater almost containing no suspended particulate organic matter becomes overflow water and is sent directly to the SSB reactor 9.

  Wastewater containing a large amount of suspended particulate organic matter sent to the UASB reactor 7 is inverted and raised in the reactor body 27 to fluidize the granular sludge 29 held in the reactor body 27. Here, nitrate nitrogen and nitrite nitrogen in the wastewater are converted to nitrogen by the denitrifying bacteria contained in the granular sludge 29, and a part of the organic matter contained in the wastewater is used as a hydrogen source for the denitrification reaction. The The suspended particulate organic matter sent to the UASB reactor 7 is used as the nucleus of the granular sludge 29. The waste water sent to the UASB reactor 7 and denitrified is sent to the SSB reactor 9 through the discharge pipe 31. On the other hand, since the overflow water of the hydrocyclone 17 is sent to the SSB reactor 9 in a form that bypasses the UASB reactor 7, the overflow water is not denitrified.

  In general, granular sludge tends to adhere to the gas generated by the denitrification treatment as bubbles and flow out together with the waste water. Also, the growth rate of granule sludge is slow, and if the granule sludge in the UASB reactor is reduced, the denitrification performance will deteriorate. Therefore, conventionally, it is necessary to increase the size of the reactor body or recover the outflowing granule sludge. there were. On the other hand, the denitrification apparatus 13 includes a liquid cyclone 17, collects suspended particulate organic matter with the liquid cyclone 17, and sends it to the UASB reactor 7. Therefore, the suspended particulate organic matter that becomes the nucleus of the granule sludge 29. The granular sludge 29 can be stably and rapidly grown. In addition, the denitrification apparatus 13 is efficient because the granular sludge 29 is fluidized with underflow water, and as a result, the denitrification performance of the UASB reactor 7 is stabilized, and as a result, the UASB reactor 7 can be downsized. it can. Further, the denitrification apparatus 13 has a simple structure, high reliability, and can be manufactured at low cost.

  Further, since the UASB reactor 7 has the sponge carrier 35 inside, the UASB reactor 7 can be started up early. The denitrifying bacteria adhering to the sponge carrier 35 has a lower bacterial cell concentration than the granular sludge 29, but the denitrifying bacteria are fastened and immobilized, so that the granular sludge 29 is not sufficiently grown at the start-up. The denitrification performance can be stably maintained even in the above. In addition, a part of the denitrifying bacteria held on the sponge carrier 35 is detached from the surface during the operation process. Since the exfoliation piece also grows as a nucleus of the granular sludge 29 together with the suspended particulate organic matter, a necessary amount of the granular sludge 29 in the UASB reactor 7 is sufficiently secured, and the UASB reactor 7 can be stably operated. Accordingly, the denitrification performance of the UASB reactor 7 is stabilized, and as a result, the UASB reactor 7 can be downsized.

  The liquid cyclo 17 is an apparatus for recovering the suspended particulate organic matter in the waste water 5. As an apparatus for recovering the suspended particulate organic matter in the waste water 5, another device such as a centrifuge or a decanter is used. Also good. However, the hydrocyclone 17 is preferable as a device for recovering suspended particulate organic matter in the waste water 5 because it is small and has a simple structure as is well known. Furthermore, it is preferable also from the point which can fluidize the granular sludge 29 with underflow water. The size of the suspended particulate organic matter that can be collected by the hydrocyclone 17 varies depending on the inner diameter of the cylindrical portion 37, the flow velocity of the inflow portion, and the ratio of the amount of underflow water and overflow water. Good. The ratio between the amount of underflow water and the amount of overflow water may be adjusted by adjusting the diameters of the discharge pipe 31 and the extraction pipe 43, or valves may be provided on the discharge pipe 31 and the extraction pipe 43, respectively. In addition, since the amount of underflow water affects the fluidization of the granular sludge 29, it is necessary to consider this point.

  Although the UASB reactor 7 and the hydrocyclone 17 constituting the denitrification apparatus 13 do not necessarily have to be integrated as shown in the present embodiment, it is preferable because the denitrification apparatus 13 can be made compact by integrating them. . The size of the cylindrical portion 37 of the hydrocyclone 17 and the size of the reactor main body 27 of the UASB reactor 7 are not necessarily the same. Further, in this embodiment, the overflow water of the hydrocyclone 17 is sent to the SSB reactor 9, but the overflow water may be returned to the water tank 5 without being sent to the SSB reactor 9. Further, when pH adjustment of drainage is necessary, a pH adjusting agent may be supplied into the liquid cyclone 17.

  The nitrification device 15 is an aerobic nitrification bacterium that oxidizes ammonia nitrogen in the waste water 5 to nitrate nitrogen and nitrite nitrogen, and drains treated in the SSB reactor 9 at a stretch. A siphon 47 that returns to 5 is included.

  The SSB reactor 9 is a horizontally placed thin nitrification tank, and a sponge carrier 51 is filled in a reactor main body 49 whose upper surface is completely opened. Since the SSB reactor 9 is horizontally placed and thin, the contact area between the sponge carrier 51 and air is increased, the height of the apparatus is suppressed, and the biological nitrification denitrification apparatus 1 can be miniaturized. The shape of the SSB reactor 9 is not particularly limited as long as the SSB reactor 9 is thin. However, for example, the shape is rectangular and the height: width: length is about 1: 2: 10. Further, from the viewpoint of downsizing the biological nitrification denitrification apparatus 1, the biological nitrification denitrification apparatus 1 is installed on the water storage tank 3 and is located in the immediate vicinity of the denitrification apparatus 13.

  The sponge carrier 51 is a member that immobilizes nitrifying bacteria, and a commonly used sponge such as urethane or cellulose can be used. The sponge carrier 51 is installed in a state where it is slightly lifted from the bottom surface 53 of the reactor main body 49, so that the bottom surface 55 of the sponge carrier 53 can also come into complete contact with air. Since the sponge carrier 51 is thin, the weight applied to the sponge carrier 51 is very small compared to the conventional tower-type nitrification tower, and it is difficult to deform. For this reason, even if a frame for holding the sponge carrier 51 is unnecessary or necessary, a simple frame may be used.

  The siphon 47 is a batch discharge means for discharging the waste water in the SSB reactor 9 intermittently. The batch discharge means can store water without leaking the drainage water 5 when drainage is supplied from the denitrification device 13 to the SSB reactor 9, and discharges the drainage water 5 at once when the SSB reactor 9 is filled with drainage. It is a device to do. The siphon 47 is attached to the end portion of the SSB reactor 9 opposite to the inlet portion of the wastewater sent from the denitrification device 13, and the inlet portion 57 of the siphon 47 is located near the bottom surface 53 of the reactor main body 49, This position is between the bottom surface 55 of the sponge carrier 51 and the bottom surface 53 of the reactor main body 49, the height of the siphon 49 is slightly higher than the top surface 59 of the sponge carrier 51, and the outlet 61 is the drainage of the water storage tank 3. Located in 5.

  The nitrification device 15 operates as follows. The waste water 5 from the denitrification apparatus 13 is supplied to the SSB reactor 9 from the end of the SSB reactor 9 on the side opposite to the siphon 49. The waste water supplied to the SSB reactor 9 is stored in the SSB reactor 9 and raises the water level. When the inside of the SSB reactor 9 is full, that is, reaches the height of the siphon 49, the siphon 49 discharges the waste water in the SSB reactor 9 to the water tank 3 at once. The nitrification device 15 continuously receives the waste water from the denitrification device 13, fills the SSB reactor 9 with the waste water, and repeats the operation of discharging the waste water through the siphon 49 when the SSB reactor 9 is full. Nitrification in the process. The ratio of the time until the drainage is full and the discharge time is about 60: 0.5-3.

Next, nitrification of the nitrification device 15 will be described.
When the waste water 5 in the SSB reactor 9 is discharged through the siphon 49, the sponge carrier 51 is completely exposed and comes into contact with air. Since the outlet portions of the discharge pipe 31 and the extraction pipe 43 of the denitrification apparatus 13 are located in the upper part of the SSB reactor 9, when the drainage water 5 is supplied into the SSB reactor 9, the wastewater 5 It is supplied to the reactor 9. Further, since the water level in the SSB reactor 9 gradually rises, the sponge carrier 51 is always in contact with air, and the nitrifying bacteria are maintained in an aerobic state. When the inside of the SSB reactor 9 is filled with drainage, the sponge carrier 51 is buried in the drainage, and the contact with the air is only the air contained in the drainage, but immediately after the inside of the SSB reactor 9 is full, the time is short. Since the drainage 5 is discharged, the sponge carrier comes into contact with air again. As a result, the ammonia nitrogen in the waste water 5 is nitrified by the nitrifying bacteria immobilized on the sponge carrier 51.

  In the conventional general nitrification apparatus, air is forcibly blown using a blower or the like in order to maintain the inside of the nitrification tank in an aerobic state. In the present nitrification apparatus 15, the inside of the nitrification tank is aerobic as described above. No special equipment is required to maintain the state. Further, since the SSB reactor 9 is horizontally placed and thin, the thickness of the sponge carrier 51 is thin and the specific surface area is large. Therefore, the sponge carrier 51 can be easily maintained in an aerobic state. The nitrification apparatus 15 has a simple structure and high reliability.

  The nitrification apparatus 15 shown in the present embodiment employs a horizontally placed and thin SSB reactor 9, so that the apparatus height can be suppressed and the nitrification apparatus 15 can be downsized. However, even if the SSB reactor 9 is simply placed horizontally, it cannot be sufficiently miniaturized unless it is linked to the batch discharge device. For example, in the method in which the SSB reactor 9 is horizontally placed and thin, and the drainage 5 from the denitrification apparatus 13 is received from one end and the drainage is overflowed and discharged from the other end, the sponge carrier 51 is always buried in the drainage. Separately, it is necessary to install an air diffuser or the like in the SSB reactor 9 and feed air using a blower or the like. Such a method requires additional devices such as a blower and piping, and the nitrification device 15 cannot be sufficiently miniaturized.

  In the above embodiment, an example of the SSB reactor 9 using the sponge carrier 51 as the nitrification device 15 is shown, but the carrier for immobilizing nitrifying bacteria is not limited to the sponge carrier 51. For example, instead of the sponge carrier 51, porous zeolite may be used. Porous zeolite is excellent in ammonia adsorbing ability, and therefore can be suitably used particularly for wastewater having a low ammonia concentration. Porous zeolite adsorbs ammonia in the wastewater when the wastewater is supplied to the nitrification tank, oxidizes the ammonia adsorbed while the wastewater is discharged and the wastewater is accumulated again, nitrate nitrogen, nitrite Can be oxidized to nitrogen. Since the ammonia in the waste water can be concentrated and then nitrified, it can be efficiently nitrified. Further, when porous zeolite is used as a carrier, the compressive strength is high, so that a frame for holding the carrier becomes unnecessary. The porous zeolite may be natural zeolite or synthetic zeolite.

  The siphon 49 shown in the above embodiment has a simple structure and does not require electricity or the like for operation, is preferable as a batch discharge device, and is preferable from the viewpoint of downsizing the biological nitrification denitrification device 1. I can say that. Examples of the batch discharge device other than the siphon 49 include a combination of an automatic valve and a water level detector or an automatic valve and a timer.

  As described above, the biological nitrification / denitrification apparatus 1 according to the present invention can realize an unprecedented size reduction by the structure and function of the nitrification apparatus 15 and the denitrification apparatus 13. The arrangement shown in the above embodiment can be said to be an arrangement suitable for downsizing the biological nitrification / denitrification apparatus 1. Since the nitrification device 15 is horizontal and has a low height, there is also an advantage that inspection management, repair and the like can be easily performed. Such a biological nitrification denitrification device 1 can be applied to water purification of large tanks, ponds and the like. Needless to say, it can also be suitably used for small domestic aquariums for raising seafood and the like. In addition, although the example which processes the waste_water | drain which does not enter / exit waste_water | drain was shown in the said embodiment, it cannot be overemphasized that it can be used also as a continuous-type waste water treatment apparatus. Even if it is a continuous-type waste water treatment apparatus, the whole biological nitrification denitrification apparatus can be reduced in size by using the nitrification apparatus 15 and the denitrification apparatus 13.

DESCRIPTION OF SYMBOLS 1 Biological nitrification denitrification apparatus 3 Reservoir 5 Drainage 7 UASB reactor 9 SSB reactor 11 Water pump 13 Denitrification apparatus 15 Nitrification apparatus 17 Hydrocyclone 29 Granile sludge 35 Sponge carrier 47 Siphon 51 Sponge carrier

Claims (6)

A UASB reactor that holds granular sludge and denitrifies nitrogen-containing wastewater;
A liquid cyclone that collects suspended particulate organic matter contained in the nitrogen-containing wastewater and supplies the collected suspended particulate organic matter to the UASB reactor as a nucleus of granule sludge;
The nitrogen-containing wastewater is fed to the hydrocyclone at a flow rate at which the suspended particulate organic matter contained in the nitrogen-containing wastewater can be separated through a pump,
The total amount of the underflow water of the hydrocyclone is sent to the UASB reactor, and the granular sludge in the UASB reactor is fluidized with the underflow water,
The underflow water contains the collected suspended particulate organic matter, and in the UASB reactor, granulated sludge grows with the suspended particulate organic matter serving as a nucleus. The UASB reactor further has a sponge carrier capable of immobilizing denitrifying bacteria inside, and a part of the sludge adhering to the sponge carrier is peeled off. In the UASB reactor, the peeled sludge becomes a nucleus and granule sludge. The denitrification apparatus according to claim 1, wherein the denitrification apparatus grows. The denitrification device according to claim 1 or 2 ,
A nitrification device that receives nitrogen-containing wastewater including wastewater that has been denitrified and discharged from the denitrification device, and nitrifies with nitrifying bacteria.
The nitrification apparatus includes a horizontally placed thin nitrification reactor having a carrier therein, and batch discharge means for discharging waste water in the nitrification reactor within a short time to expose the carrier when the nitrification reactor is full. With
The biological nitrification denitrification apparatus characterized in that the nitrification apparatus performs nitrification treatment by alternately repeating filling and discharging of waste water. The biological nitrification denitrification apparatus according to claim 3 , wherein the batch discharge means is a siphon. The biological nitrification denitrification apparatus according to claim 3 or 4 , wherein the carrier is porous zeolite. A biological nitrification denitrification device for treating nitrogen-containing wastewater stored in a wastewater storage tank,
The biological nitrification denitrification device according to any one of claims 3 to 5 ,
The nitrogen-containing wastewater savings water further comprises a water pump for continuously water in the liquid cyclone,
The denitrification device is installed in the drainage water storage tank, the nitrification device is installed in the upper part of the drainage water storage tank,
The biological nitrification denitrification apparatus, wherein the batch discharge means returns the nitrified waste water to the waste water storage tank.

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