KR100398139B1 - Biological Nutrient Removal Process that Simultaneously make an oxic, microaeration and anoxic Zone by a Submerged Moving Media and Reactor Volume Optimum - Google Patents

Abstract

The present invention is to effectively remove organic matter and nitrogen (N), phosphorus (P) of sewage and wastewater by simultaneous composition of aerobic and microcellular phase, anoxic reaction phase through the perfect immersion rotary media and aeration tank volume optimization in a single reactor An apparatus and a method of operating the same.

The constitution of the present invention comprises: an anaerobic tank (1) for releasing phosphorus (P) by using organic materials in influent sewage and wastewater as energy sources; An aeration tank 2 having a fully immersed rotary medium in which organic material oxidation, nitrification and denitrification, and ingestion of the object to be processed having passed through the anaerobic tank 1 are performed simultaneously; A settling tank (3) through which the to-be-processed object via the said aeration tank (2) is separated into solid-liquid by treated water and sludge; It consists of a sludge conveying device (4) for transporting the sludge deposited on the bottom of the settling tank 3 to the anaerobic tank (1) to maintain the MLSS concentration in the anaerobic tank (1). According to the present invention, the anaerobic tank 1 is placed at the front end, and the fully submerged rotary media assembly 17 is installed and operated in the aeration tank 2 to secure a high concentration and high density of adherent microorganisms on the surface of the media assembly. By maintaining the biofilm of a certain thickness by the shear force with the water by the rotation of the assembly 17, it is possible to prevent the deterioration of the effluent quality due to excessive adhesion of the biofilm on the surface of the medium and the temporary detachment of the biofilm. In particular, by optimizing the surface area and the volume of the aeration tank (2) of the fully immersed rotary medium assembly (17) filled in the aeration tank (2), the same reaction tank by adjusting the MLSS concentration and dissolved oxygen (DO) concentration in the aeration tank (2) Removal of organic matter, nitrogen and phosphorus from sewage and wastewater that can simultaneously create organic phase, nitrogen, and phosphorus in the reaction phase, that is, aerobic and microcellular phase, and anaerobic conditions An apparatus and a method of operating the same are provided. The present invention can perform the role of several reactors used in the existing treatment method in a single reactor to save the initial facility cost, maintenance costs, etc. At the same time, artificially create an environment suitable for the activity of nitrogen, phosphorus removal microorganisms Can be removed effectively. The present invention is a complex system using adherent growth microorganisms and suspended growth microorganisms, and also can maintain a long residence time (SRT) of adherent microorganisms formed on a fully immersed rotating medium, which can flexibly respond to impact loads, dynamic loads, and temperature changes. Sewage and wastewater treatment system

Description

Biological Nutrient Removal Process that Simultaneously make an oxic, microaeration and anoxic Zone by a Submerged Moving Media and Reactor Volume Optimum}

Pollutants contained in sewage and wastewater can be classified into organic substance, nitrogen, phosphorus, etc. In order to remove these pollutants, the conventional treatment method that focuses on BOD removal of sewage and wastewater is nitrogen which is a limiting factor of eutrophication (N), phosphorus (P), etc. are not removed and it is difficult to achieve a fundamental improvement. Therefore, it is urgent to develop an effective and simple process that can simultaneously remove organic substances, nitrogen, and phosphorus in order to preserve the quality of rivers and lakes. However, most sewage treatment plants currently in operation are standard activated sludge processes or alternatives, with only about 10-30% of nitrogen and phosphorus removed and mostly discharged untreated. As a result, advanced treatment processes have been developed and introduced to remove nitrogen (N) and phosphorus (P), which are the main causes of eutrophication. In recent years, a single process that is effective in terms of treatment cost and maintenance, can be denitrified and dephosphorized, and has various treatments related to BNR (Simultaneous Biological Nutrients And Organic Matters Removal) technology. Research is actively underway.

The present invention discharges phosphorus (P) using sewage and wastewater into the anaerobic tank by using organic materials in the influent as an energy source, followed by organic material oxidation, nitrification, and nitrification in aeration tank (2) having a fully immersed rotary media assembly (17). Denitrification, denitrification by phosphorus excess ingestion, and dephosphorus reaction occur. The above process optimizes the surface area and the reaction tank volume ratio of the fully immersed rotary medium assembly (17) to 10 to 15 l / m2 according to the organic material load of the influent, and also controls the aerobic, microcellular, and oxygen-free reactions in the aeration tank by controlling the DO and MLSS concentrations. By forming the reaction phase at the same time, organic matter oxidation, nitrification and phosphorus intake reaction are performed under aerobic conditions, and organic matter oxidation and nitrification, phosphorus intake reaction and aerobic denitrification are performed under microcellular conditions. Under anoxic conditions, NO ₃ -N is used as an electron acceptor to reduce the denitrification. Oxygen zones are formed at the center of the axis of the fully immersed rotary medium assembly of the aeration tank, and microcellular zones and aerobic zones are formed at the outer part of the aeration tank. An apparatus and a method for simultaneously removing nitrogen and phosphorus as well as organic substances in wastewater.

The BNR process developed so far is divided into continuous inflow activated sludge process and batch activated sludge process. Continuous inflow activated sludge methods include A / O, A ₂ / O, UCT, MUCT, VIP, etc.

Among them, the A / O method for the purpose of phosphorus removal is carried with the return sludge mixed with the inflow water into the anaerobic tank.In the anaerobic tank, the phosphorus-removing microorganism absorbs the organic material of the influent into the cell and releases the phosphorus. It is a method of inducing the oxidation of the substance and the intake of phosphorus, it is pointed out that the nitrogen removal efficiency is lower than the phosphorus removal efficiency, and requires a high rate of oxygen transfer for high load operation.

The A ₂ / O process combines anaerobic, anaerobic and aerobic processes to simultaneously remove biological nitrogen and phosphorus. In order to remove phosphorus, the anaerobic-aerobic condition is repeated to release phosphorus from the anaerobic tank, and in the aerobic tank, nitrification is preceded and returned to the anaerobic tank, followed by denitrification. However, nitrate nitrogen in the return sludge prevents the release of phosphorus in the anaerobic tank, so the removal rate of phosphorus is low and the internal circulation rate is high.

In order to compensate for the fact that the nitrate nitrogen in the return sludge, which is a disadvantage of the A ₂ / O method, is introduced into the anaerobic tank and the phosphorus release mechanism is disturbed, the return sludge is returned to the anoxic tank to remove the nitrate nitrogen by the denitrification reaction. Later, the method is returned back to the anaerobic tank, which has the disadvantage of increasing maintenance costs and complicated operation.

The MUCT method is a biological nitrogen and phosphorus removal method that complements the UCT method. That is, in the MUCT method, the return of the mixed sludge and the aerobic tank mixed liquid flows into a single anoxic tank in the UCT method, and the anoxic tank is separated into two parts in the MUCT method. In addition, the return of the aerobic tank mixed solution flows into the second anoxic tank to remove nitrogen by the denitrification reaction. Therefore, there is an advantage that the phosphorus removal rate is higher than other biological nitrogen, phosphorus simultaneous removal method. However, there are a lot of internal transport costs a lot of power costs and maintenance is difficult.

The VIP method is similar to the UCT and MUCT methods, but the complicated operation has been a disadvantage.

As described above, the continuous inflow activated sludge methods have a disadvantage in that nitrogen and phosphorus removal efficiency is determined by internal transport, and installation and maintenance costs are increased by installing a return pump.

Another method, batch activated sludge process, is divided into intermittent inlet continuous batch process (SBR) and intermittent aeration batch extended batch system (Intermittent Cycle Extended Aeration System) according to the inflow method. There is an advantage that the initial investment cost is low, so it is inadequate for large-scale processing facilities.

The present invention provides an economical, easy to maintain and operate management process and apparatus for the removal of organic substances in the sewage and wastewater generated in the living environment and the removal of nutrients such as nitrogen and phosphorus, and the operation method thereof. This is to prevent water pollution and to maintain and secure clean water resources, especially by suppressing eutrophication caused by algal blooms caused by nutrients.

The present invention is intended to improve the stability of the treatment by introducing a fully immersed rotary medium in the advanced sewage treatment process to increase the adaptability to environmental factors such as impact load or temperature change. In addition, to improve the driving device of the rotating medium to reduce the operating cost, to improve the convenience of maintenance and site construction.

The present invention optimizes (10 to 15 l / m2) of the assembly and the reaction tank volume ratio in a completely immersed rotary medium to remove organic substances, nitrogen and phosphorus in the same reactor, thereby maintaining aerobic, microcellular and oxygen free conditions in the same reactor. In order to provide a device for removing pollutants in sewage and wastewater with economical and practicality by simplifying the construction of reactors by developing devices capable of removing contaminants by forming them at the same time, eliminating internal transport facilities, and reducing operating management and maintenance costs. to be.

The present invention is to provide a biological treatment apparatus and method for removing organic substances, nitrogen, phosphorus and the like contained in sewage and wastewater at the same time in the same reactor.

The present invention by using a fully immersed rotary media assembly 17 to ensure a large number of microorganisms and at the same time to form a microbial film of a certain thickness by the water flow shearing force by rotation to maintain the optimal state at all times to form an excessive biofilm and the biofilm detachment accordingly It aims to prevent the deterioration of effluent quality caused by organic matter, nitrogen, phosphorus removal device and operation method of sewage and wastewater which is highly adaptable to environmental changes such as load fluctuation, temperature change and harmful substance inflow.

The present invention is to optimize the reaction tank volume / medium surface area ratio (10 ~ 15ℓ / ㎡) using a fully immersed rotating media in a single reaction tank, as well as aerobic and microcellular groups, oxygen-free reaction phase in a reactor by adjusting the MLSS concentration, DO concentration An object of the present invention is to provide a device for removing organic matter, nitrogen, and phosphorus in sewage and wastewater, which can reduce the land area required by coexisting and simultaneously removing nitrogen and phosphorus.

The present invention is to reduce the operating cost by improving the operation method of the rotating medium assembly, to fully reduce the operation of the immersion type media, the assembly of the medium, the development of the drive device using the universal joint coupling 28 and the operation of the fully immersion type rotary media reactor wall And to provide a device and operation method such as a gland packing assembly 18 for maintaining the watertightness of the contact portion penetrated through the shaft of the media assembly to improve the site construction and to reduce the maintenance cost.

The above and other objects of the present invention can be achieved by the present invention described below.

1 is a schematic view showing a device for removing organic substances, nitrogen and phosphorus in sewage and wastewater according to the present invention.

Fig. 2 (a) is a sectional view of the anaerobic tank 1 and its apparatus according to the present invention, and (b) is a plan view.

Figure 3 (a) is a cross-sectional view of the aeration tank (2) having a fully immersed rotary medium assembly 17 according to the present invention, (b) is a side cross-sectional view.

4 is a cross-sectional view of a reactor constituting device such as a fully immersed rotary medium assembly and a grand packing assembly, a media assembly driving device, a universal joint coupling, and the like when the aeration tank 2 according to the present invention is composed of two sets.

Figure 5 (a) is an assembly cross-sectional view of the device gland packing assembly 18 used in the present invention, (b) is an assembly flow chart, (c) is a plan view and cross-sectional view of the grand packing 29, (d) is a watering ( 31 is a plan view and a cross-sectional view, (e) is a plan view and a cross-sectional view of the sleeve 32, (f) is a plan view and a cross-sectional view of the grand packing box 33.

6 is a detailed view of the media assembly driving apparatus 21 of FIG. 3 used in the present invention.

FIG. 7 is a detailed view of the universal joint coupling 28 device of FIG. 4 used in the present invention.

FIG. 8 (a) is an outline view of the fully immersed rotary medium assembly 17 of FIG. 3 used in the present invention, (b) is a cross-sectional view of the fully immersed rotary medium assembly 17, and (c) is a fully immersed rotary medium. Sectional view of the media disk 59 constituting the assembly 17, (d) is a cross-sectional view of the media disk-shaft support wheel 60, (e) is a cross-sectional view of the shaft-assisted shaft support wheel 61. Indicates.

9 is a cross-sectional view of the media assembly shaft 56 of FIG. 8 that constitutes the fully immersed rotary media assembly 17 used in the present invention.

[Description of Symbols for Main Parts of Drawing]

1: anaerobic tank 2: aeration tank with fully immersed rotating media

3: sedimentation tank 4: sludge conveying device

5: anaerobic reactor 6: inlet

7: Inlet baffle 8: Stir motor

9: Detachable Flange 10: Stirrer Shaft

11: stirring blade 12: support metal box

13: Block for stirring 14: Sludge conveying line

15: outlet 16: aeration reactor

17: Fully immersed rotating media assembly 18: Grand packing assembly

19: Medium assembly drive bearing 20: Medium assembly rotary gear

21: Media assembly drive 22: Floor hunting

23: Aeration device baffle 24: Membrane rod diffuser

25: diffuser 26: air flow control valve

27: blower 28: universal joint coupling

29: grand packing 30: packing

31: watering 32: sleeve

33: Grand packing box 34: Grand packing box fixing flange

35: Grand Packing Assembly Bolt 36: Grand Packing Detachable Wrench Bolt

37: tap for detachable water ring 38: sealing water injection groove

39: O-ring 40: Tap for detachable sleeve

41. Sealing water valve 42: Gland packing bolts

43: packing box reinforcing flange 44: packing box detachable tab

45: packing box assembly bolt 46: deceleration drive motor and inverter

47: drive bearing 48: V-belt

49: V-belt pulley 50: drive shaft

51: drive chain 52: drive gear

53: fixed coupling 54: universal coupling

55: Completely immersed rotating medium assembly Outline drawing 56: Media assembly shaft

57: medium assembly auxiliary shaft 58: medium gap retaining rod

59: media disc 60: media disc-shaft support wheel

61: shaft-assisted shaft support wheel 62: medium assembly auxiliary shaft

63: medium interval holding rod 64: medium assembly shaft ball

65: Media Assembly Shaft Keyway

The present invention adopts a biological treatment method, an anaerobic tank (1) for directly introducing the inflow water passing through the screen and the settler without passing through the primary settler, and the aeration tank (2) having a fully immersed rotary medium assembly (17), It consists of a sedimentation tank 3, a sludge conveying apparatus 4, etc.

According to the present invention, the treated material is introduced into the anaerobic tank to release phosphorus (P) by using the organic material in the influent as an energy source, the organic material oxidation in the aeration tank (2) having a fully immersed rotary medium assembly (17), Nitrification and denitrification, denitrification by phosphorus excess ingestion, and dephosphorization The process optimizes the fully immersed rotary medium assembly 17 and the reaction tank volume ratio to 10-15 l / m 2 according to the organic material load of the influent, and also the DO concentration (0.5-1.5 mg / l) and MLSS concentration (floating microorganism concentration: 3,000 ~ 6,000mg / ℓ, 6,000 ~ 12,000mg / ℓ in case of attachment growth microorganisms are formed to simultaneously form aerobic, microcellular phase and anoxic reaction phase in the aeration tank, so that organic matter oxidation, nitrification and phosphorus intake reaction occur under aerobic conditions. In the microcellular phase, organic material oxidation, nitrification, phosphorus intake reaction, and aerobic denitrification occur. Under anoxic conditions, NO ₃ -N is used as an electron acceptor to reduce the denitrification. By operating under the above conditions, an oxygen-free zone is formed at the center of the axis of the fully immersed rotary medium assembly of the aeration tank, and microcellular base zones and aerobic zones are formed at the outer portions thereof. Operation of the fully immersed rotary medium assembly 17 while maintaining the reactor volume and the above optimized condition (10-15 l / m 2) controls the flow and dispersion of air by aeration and also circulates the mixed liquid and injected air in the reactor. By forming a vertical flow (Cyclo Vertical flow) of continuous circular motion in the direction of the media rotation is made a limited mixing to form the above conditions. In the present invention, the aeration device of the aeration reactor is installed on the outer side of one side of the reactor, the oxygen supply is made by the swirl flow type aeration, the central direction of the circular motion in the outer circumference of the fully immersed rotary medium assembly 17 The circulation of the mixed liquid and oxygen is performed, and a narrow labyrinth is formed between each medium of the media assembly, and the mixed liquid between the media is limited in the left and right directions so that the oxygen supply is directly limited to the center, and the mixed liquid is completely immersed by rotation. At the center of the media assembly 17, an oxygen-free state is formed by oxygen dissipation and consumption during circulation, and microcellular phase and aerobic conditions are formed on the outer portion thereof. Therefore, the operation of the aeration tank according to the present invention simultaneously forms the three reaction phases using the fully immersed rotary media assembly 17 while operating in a completely aeration type (SMMCAR) to remove not only organic matter but also nitrogen and phosphorus in one reactor. It is therefore a device and technology having efficiency and economy. The treated material via the aeration tank (2) is separated into solid water into the treated water and sludge in the settling tank (3), and the sludge is returned to the anaerobic tank (1) by the sludge conveying apparatus (4) to maintain the MLSS in the anaerobic tank. In addition, some sludge is disposed to provide a device and method for removing organic substances, nitrogen and phosphorus in the sewage and wastewater to ensure a stable treatment efficiency.

The present invention relates to an efficient, economical and practical treatment apparatus capable of removing nutrients such as nitrogen (N) and phosphorus (P) contained in sewage and wastewater by a biological treatment method and a method of operating the same. will be. More specifically, an anaerobic tank (1) in which organic substances are removed and phosphorus (P) is released by the phosphorus-removing microorganism (PAO) at the front end is used to decompose the poly-P accumulated in the cell. Intake organic acid such as acetate (acetate) and then PHB (poly- It is stored in the form of -hydroxybutyrate, and conversely, ortho-P from the decomposition of Poly-P is released into the mixture. The anaerobic tank 1 is provided with a stirring motor 8 for mixing MLSS, a blocking plate 13 for stirring, an inlet baffle 7 for preventing short circuiting, and the like.

Aeration tank (2) having a fully immersed rotary medium (2) at the rear end of the anaerobic tank (1) secures a large amount of high concentration and high density of adherent microorganisms on the surface of the medium, and microorganisms by using the shear force by operation of the fully immersed rotary medium assembly (17). By keeping the thickness of the biofilm constant, the microbial activity was increased to improve the treatment efficiency, and the impact load, the dynamic load, and the flexibility to change the temperature were increased. The aeration tank (2) having the reactor is operated by optimizing the reaction tank volume for the surface area of the media assembly to 10 to 15 l / m2, and simultaneously controlling the aerobic and microaeration in the same reactor by DO control through MLSS control in the reactor. Anoxic conditions coexisted, allowing organic material oxidation, nitrification and denitrification, and phosphorus intake. By operating the above conditions, an anoxic state is formed near the central zone of the fully immersed rotary medium assembly 17, and microaeration and aerobic conditions are formed on the outer side thereof. At the same time, aerobic, microcellular and anoxic conditions are formed in one reactor, and organic material oxidation, nitrification and denitrification, and phosphorus intake are simultaneously performed. In the aeration tank (2), the structure and operation of the fully immersed rotary medium assembly (17) are controlled by aeration and DO concentration, MLSS concentration in the reactor, and optimization of the reaction tank volume ratio for the total immersion rotary media surface area (10 ~ 15ℓ / ㎡). Plays a very important role in forming the aerobic, anaerobic and microcellular conditions necessary for simultaneous removal of nitrogen and phosphorus in the reactor. The fully immersed rotary medium assembly 17 regulates the flow and dispersion of air by aeration in the reactor, and also allows the circulation of the mixed liquid and the injected air in the reactor to flow vertically in a continuous circular motion in the direction of media rotation (Cyclo Vertical). limited flow is achieved by forming a flow to form the conditions. On the other hand, when the optimization condition is less than 10ℓ / ㎡ in the case of high organic material load clogging (clogging), short circuiting (circulation), circulating disturbance of the inter-media biofilm is likely to occur, and to maintain a constant thickness of the biofilm Since driving speed must be high, driving power is increased and it is inefficient. On the other hand, if it is maintained at 15 l / m2 or more, the filling rate of the medium decreases, thus securing the blofilm, and if the medium interval is too large, the mixing and flow patterns change, which is disadvantageous for maintaining the reaction phase simultaneously. Maintaining at / m 2 was most effective.

The organic material and nitrogen of the sewage and wastewater by simultaneous composition of aerobic and microcellular phases and anoxic reaction phase by optimizing the reaction tank volume and the complete immersion type rotating medium according to the present invention, and the operation method of the organic substance and nitrogen (N) It is able to process phosphorus (P) at the same time, high removal efficiency, simple process and device configuration, and provides convenient Biological Nutrient Removal (BNR) device technology. The present invention applies a complex system of attached microbial growth and suspended microbial growth to compensate for the shortcomings of the existing treatment process and to change various environmental factors such as load fluctuations, temperature changes, and insoluble decomposable harmful substances. It is a technology that provides stable processing efficiency because it responds flexibly. According to the present invention, various microbial populations are formed in the system and the thickness of the biofilm formed on the surface of the medium is kept constant so that the activity of the microorganisms can be maintained at an optimum state and the microbial retention time (SRT) is kept long. It is possible to obtain stable treated water against impact load or dynamic load fluctuation of organic material, and it can reduce the land area by simultaneously removing organic material, nitrogen and phosphorus in a single reactor, and it is possible to treat with low DO concentration. Therefore, the operation cost is reduced due to abandonment, and the reactor configuration is simple, and thus the device configuration is not complicated, and the operation is easy and economical high processing device is provided.

Adhesion Growth (Biofilm) is a method of decomposing organic matter in sewage and wastewater within a short time by a biofilm formed on the surface of a medium by using microorganisms attached to the medium. Divided by. Existing fixed bed media increases the thickness of the biofilm attached, causing clogging and short circuiting, circulation failure, and unloading of the microbial layer. It is necessary to install an extra reactor because it causes a lot of difficulties in management because the biofilm is difficult to update. On the other hand, the cubic type fluidized bed medium has a disadvantage in that it is cumbersome to maintain and increase cost because it requires abrasion and loss and replenishment, and a lift facility for evenly distributing the medium in the reactor.

The fully immersed rotary media assembly 17 which can adjust the speed according to the present invention can maintain a biofilm of a constant thickness by shear force with water, form a high concentration and high density microbial membrane, and provide a long time microbial retention time ( SRT) can be maintained so that it can flexibly respond to impact load, dynamic load, and water temperature change, and does not require replacement or replenishment due to abrasion and loss. This can solve the disadvantages of the existing fixed bed or fluidized bed medium, such as reduced maintenance costs.

The pilot plant operation according to the present invention showed excellent treatment performance in the removal of organic substances and nutrients. Therefore, the application of the device and operation method according to the present invention to remove organic substances, phosphorus and nitrogen from sewage and wastewater is effective, economical and compact system, which is suitable for the collective sewage treatment of new sewage treatment plant or rural area. The present invention provides an advanced treatment system and method that can be easily applied to sewage treatment plants such as tourism facility group districts, where the flow population changes, the flow rate, and the sewage and sewage characteristics vary depending on the season.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a device for removing organic substances, nitrogen and phosphorus in sewage and wastewater according to the present invention. As shown in FIG. 1, the present invention provides an anaerobic tank 1 and a fully immersed rotary medium assembly 17. It consists of the aeration tank (2) which has (), the settling tank (3), and the sludge conveying apparatus (4).

Phosphorus removal occurs in the anaerobic tank (1) by the microorganisms, and in the process, organic substances are removed by using organic materials as energy sources.

2 is a cross-sectional view and a plan view of the anaerobic tank 1, the anaerobic tank 1 is the inlet 6 and outlet 15 and the inlet baffle (7) for preventing a short circuit, a stirrer plate 13 (square reactor type) In case of no need of a baffle plate), a stirring motor (8) for mixing microorganisms and wastewater and wastewater, a detachable flange (9), agitator shaft (10), and stirring blade ( 11), a stirring device composed of a supporting metal box 12 is installed and operated. The operation of the anaerobic agitator is operated at 30-90 RPM, depending on the size of the reactor and the degree of agitation. The MLSS concentration in the anaerobic tank is maintained by the sludge conveying apparatus 4 from the settling tank 3, and the MLSS concentration is maintained at about 3,000 to 6,000 mg / l depending on the influent organic matter load. The residence time in the anaerobic tank (1) is maintained for 1 to 3 hrs depending on the change of influent. The sludge conveyance rate from the settling tank 3 to the anaerobic tank 1 is about 50-100%.

3 is a longitudinal, cross-sectional view of the aeration tank 3 having a fully immersed rotary medium assembly 17, the configuration of the aeration tank 3 is a fully immersed rotary media assembly 17, aeration device baffle 23, membrane rod diffuser (24), aeration device such as diffuser (25), air flow control valve (26), blower (27) and the like, a medium assembly driving device (21), a gland packing assembly for preventing leakage of reactor wall and medium assembly shaft contact (18) It is composed of The structure of the aeration reactor has an arc-like structure such as the circumferential circumference of a fully immersed rotating medium, as shown in (b) of FIG. 3 in order to optimize the media assembly surface area and the reaction tank volume ratio to 10-15 l / m2. The other side on which the diffuser 24 is installed is a straight structure, and a bottom chamfer 22 of about 15 ° is placed in a direction from which the membrane rod diffuser 24 is installed from the center of the reactor base to reduce dead space and react. The circulation of the in-flight mixed liquid and air is easy.

On the other hand, when operating two or more aeration tank (2), since the fully submerged rotary media assembly 17, the driving load and the axial load is greatly reduced by buoyancy, as shown in Figure 4, the universal joint coupling 28 By using the device to operate the two-axis fully immersed rotating media assembly 17 as a single drive device was configured to reduce the device requirements and reduce the operating cost.

The complete submerged rotary media assembly 17 was installed and operated in the aeration tank 2 to simultaneously form the aerobic, microcellular and anoxic zones necessary for nitrogen and phosphorus removal in the reactor. At this time, the aeration was completely aerated, and the above conditions were formed through the installation and operation of the rotating medium assembly and the adjustment of the MLSS concentration and the DO concentration in the aeration tank to simultaneously perform nitrification, denitrification, and dephosphorization. When fully immersed rotary media assembly 17 is operated with reaction tank volume and 10 ~ 15ℓ / ㎡, the mixed liquid and the injected air in the reactor are controlled by the vertical flow of continuous circular motion in the media rotation direction. Limited mixing is achieved, and within the aeration reactor with control of DO concentration (0.5-1.5 mg / l) and MLSS concentration (floating microorganisms: 3,000-6,000 mg / l, 6,000-12,000 mg / l with adherent growth microorganisms). It plays a key role in forming coexistence of aerobic, microcellular, and anaerobic conditions. On the other hand, the complete submerged rotary media assembly 17 was installed in the aeration tank to secure a large number of microorganisms, and at the same time, the microbial membrane of the rotating media was maintained using a shear force with water due to the rotation of the media. It was possible through the rotation control of the media assembly (17). The rotation speed is controlled at a low speed in the range of 0.05 to 0.1 m / s at the beginning of biofilm formation, and after the biofilm is completely formed, the rotation speed is operated at about 0.1 to 0.3 m / s depending on the thickness and agitation degree of the biofilm. In addition to the composition of the reaction phase (aerobic, microcellular phase, anoxic) and the formation of adherent biofilms, the rotating medium assembly serves as a disturbing device that allows the activated sludge to be properly mixed, thereby contacting the object with the microorganism and supplying oxygen. Increase efficiency to promote organic material oxidation and nitrification, and smooth denitrification. DO concentration at the outside of the aeration tank is kept relatively low at 0.5 ~ 1.5mg / ℓ, and MLSS concentration is operated in the range of 3,000 ~ 6,000mg / ℓ (6,000 ~ 12,000mg / ℓ with attached growth microorganism) depending on the influent organic matter load. . Maintaining the DO concentration too high is disadvantageous for the simultaneous composition of the reaction phases and increases the aeration power cost, which is ineffective. In the aerobic condition in the above-described reactor formed the nitrification process is carried out by the organic material oxidation and nitrification microorganisms and ingestion is carried out, in the anoxic condition denitrification and intake by the denitrification microorganisms, nitrification in the microcellular phase state In addition, co-intake and aerobic denitrification coexist to provide a suitable environment for simultaneous nitrification, denitrification and dephosphorization in one reactor.

The retention time (HRT) of the aeration tank is maintained for 4 ~ 6hr according to the change of the influent, and the appropriate other operating conditions according to the load condition and the characteristics of the influent sewage are 10 ~ 15ℓ / ㎡ effective volume ratio of the aeration tank per surface area of the rotating medium assembly. Maintain the effective spacing of the rotating media at 15 to 20 mm, and the MLSS concentration of the aeration tank 2 is 3,000 mg / L to 6,000 mg / L as suspended phase microorganisms (6,000 mg / L to 12,000 mg / inclusive of attached microorganisms). ℓ). DO concentration outside the reactor is kept relatively low, 0.5 ~ 1.5mg / l. The rotation speed of the fully immersed rotating medium is in the range of 0.05 to 0.3 m / s. At the initial stage of biofilm formation, it operates at a low speed (about 0.05 m / s), and after biofilm formation, it operates at about 0.1 to 0.3 m / s depending on the thickness of the film. Many experiments have shown that it is suitable for maintaining the biofilm thickness in the above operating speed range. Keeping the speed higher than necessary can increase the power ratio and increase the shear force, which can cause excessive detachment of the biofilm. The aeration method of the aeration tank uses a swirl flow aeration method in the rotation direction and the forward direction of the immersion type rotary medium assembly. The aeration device is installed in the upper part of the reactor wall side haunch 22, which is about 15 degrees from the center of the reactor base, and the diffuser 25, the membrane rod diffuser 24, the aeration device baffle 23 and the like are installed. The aeration device baffle 23 prevents the strong water flow caused by the aeration from acting directly on the surface of the fully immersed rotary medium assembly 17 so that the biofilm is not forcibly detached.

FIG. 5 is a detailed view of the gland packing assembly 18 of FIG. 3 for maintaining watertightness of the reactor wall and media assembly shaft contacts used in the present invention, (a) is an assembly cross-sectional view, (b) is an assembly flow chart, (c) is a plan view and a sectional view of the grand packing 29, (d) is a plan view and a sectional view of the water ring 31, (e) is a plan view and a sectional view of the sleeve 32, the inside of the sleeve (32) One o-ring 39 is provided to maintain the watertightness of the surface in contact with the shaft. The water ring 31 and the packing 30 maintain watertightness between the outer surface of the sleeve 32 and the grand packing box 33. The grand packing 29 is installed at the outermost part of the grand packing assembly 18 to fix and provide convenience during the inspection and repair of the packing 30, and the degree of wear of the packing 30 after a long time of use has elapsed. By tightening using the grand packing assembly bolts 35 of the grand packing 29 to maintain the watertightness continuously. The grand packing detachable wrench bolt 36 of the grand packing 29 uses the grand packing detachable wrench bolt 36 from the shaft without disassembling the media assembly shaft 56 when the packing 30 is replaced. Install it for easy removal. The gland packing box fixing flange 34 constituting the gland packing assembly 18 was installed on the wall of the aeration reactor to facilitate the construction of the site.

Sealing water valve 41 is installed in the grand packing box 33 of the grand packing assembly 18 and the sealing water is injected into the water ring 31 of the grand packing assembly 18 at 2 kg / cm 2 pressure and packed to 20 l / min. The water tightness of the voids was maintained.

FIG. 6 is a detailed view of the media assembly driving device 21 of FIG. 3, wherein the reduction drive motor and inverter 46, the driving device bearing 47, the V-belt 48, the V-belt flip 49, and the drive shaft are shown in FIG. 50, the drive chain 51, the drive gear 52, and the like. Completely immersed rotary medium assembly 17 by the ratio reduction drive motor and inverter 46 of the medium assembly drive device 21 and the drive gear 52 and the medium assembly rotary gear 20 (1: 4 to 1: 8). Adjust the speed of rotation.

FIG. 7 is a detailed view of the universal joint coupling 28 of FIG. 4, by using the universal joint coupling 28 to drive two axes of the fully submerged rotary media assembly 17 as one drive motor, thereby reducing the demand for the driving motor. It can save the running cost. The universal joint coupling 28 is composed of a fixed coupling 53 and a universal coupling 54, and is connected to the medium assembly driving device 21 by the medium assembly rotating gear 20 to form a fully immersed rotary medium assembly ( 17) Operate 2 axes.

FIG. 8 is a detailed view of the apparatus of the fully immersed rotary medium assembly 17 of FIG. 3 used in the present invention. (a) is an outline view of the fully immersed rotary medium assembly 17, (b) is a sectional view of the fully immersed rotary medium assembly 17, (c) is a sectional view of the media disc 59, and (d) is a media disc -Sectional drawing of the shaft support wheel 60, (e) shows the cross section of the shaft auxiliary shaft support wheel 61. As shown in FIG. The media disc-shaft support wheel 60 and the media disc 59 are formed of a composite material or polyethylene material to realize light weight, and to prevent corrosion and improve durability. Unlike the conventional media, the media disk 59 is a flat disk with a roughened surface without roughness on the outer surface, and optimizes the aeration tank volume per surface area of the fully immersed rotating media assembly 17 to 10 to 15 l / m2. It is manufactured to facilitate, and the media spacing is maintained by about 15 to 20 mm by the media assembly shaft 56 and the media assembly auxiliary shaft 57, the media gap retaining rod 58, the media disc-shaft support wheel 60, etc. It consists of a rotating body structure. It is a device for maintaining a constant thickness of the microbial film formed on the medium disk 59, the gear ratio of the reduction drive motor and inverter 46, the drive gear 52 and the medium assembly rotary gear 20 is 1: 4 to 1: 8 range By controlling the driving speed according to the degree of formation of the biofilm using a speed control device having a speed control with the control of the strength of the biofilm to control the thickness of the biofilm.

9 is a cross-sectional view of the media assembly shaft 56 constituting the fully immersed rotating medium assembly 17.

The sedimentation tank (3) is a device in which the treated materials introduced through the aeration tank (2) are separated into solids into treated water and sludge. The symbolic water is discharged into the effluent and the sludge is returned to the anaerobic tank (1), and some sludge is surplus sludge. Discard. The sludge conveyance from the settling tank 3 to the anaerobic tank 1 is about 50-100%. The sedimentation tank consists of a scraper for collecting sludge, a deceleration drive motor, and a sludge conveying device (4). The scraper has a mero structure to facilitate installation and maintenance.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples. The following examples are provided to facilitate understanding of the present invention and the present invention is not limited only to the following examples.

According to the present invention described above, a pilot plant of 70㎥ / day scale was produced according to the organic matter, nitrogen and phosphorus removal device and its operation method in the sewage and wastewater from February 2001 to December 2001. Drive. <Table 1> shows a detailed description of the pilot plant specifications. The characteristics of influent inflow during the operation period are shown in <Table 2>, and the influent is the sediment overflow water of K sewage treatment plant, 278mg / L for BOD and COD _Cr , 474mg / L for 474mg / L and TP and TKN for 9mg / L and 48mg /, respectively. The average value of L was shown, and the concentration of COD _Cr and TKN was investigated because sewage from the site was mixed with the supernatant of the tank. <Table 3> shows the operating conditions of the pilot plant (Pilot-plant). The aeration tank HRT was 5.7 hr, the hydraulic load ratio and the organic load ratio were 48 L / m 2 / day and 22.7 g TCOD _Cr / m 2 / day, respectively. <Table 4> shows the treatment efficiency in the pilot plant. The values in <Table 4> are the average values during the entire operation period. The runoff is collected 4-5 times a week and analyzed by standard methods. It was. The COD _Cr and BOD removal efficiencies were 94.9% and 96%, respectively, and the effluent BOD and SS concentrations were 11.2mg / ℓ and 7.6mg / ℓ, respectively. In addition, the TN, TP removal efficiency was also high as 86%, 94.4%, which proves that the device of the present invention and its operation method are superior to the conventional method.

<Table 1> Pilot plant (Pilot-plant, 70㎥ / d) specifications according to the present invention

<Table 2> Influent Characteristics

<Table 3> Pilot Plant Operating Conditions and Microbial Characteristics

<Table 4> Pilot plant operation results

The present invention effectively removes organic substances, nitrogen, phosphorus and other impurities in the influent sewage and wastewater, and is easy and easy to maintain, and reduces the construction cost and operating cost, thus effectively treating the sewage and wastewater. It has the effect of providing a compact biological sewage and wastewater treatment apparatus.

The present invention can remove the organic material, nitrogen, phosphorus in the same reactor at the same time to reduce the land area, the device configuration is simple and easy to operate, there is no internal transport to provide an economical device, such as maintenance costs are saved It is effective.

The present invention can secure various microbial populations by using attached growth microorganisms as well as floating growth microorganisms, and the microorganism residence time is long, so that the environmental factors such as impact load of organic materials, dynamic loading variation, temperature change, etc. Its flexibility can contribute to securing process stability.

The present invention removes nitrogen and phosphorus as well as organic matter in the influent sewage and wastewater, thereby providing a significant contribution to water pollution reduction by preventing dissolved oxygen depletion and eutrophication caused by algae growth in the discharge water system.

Apparatus and its operating method according to the present invention has the effect of increasing the nitrogen, phosphorus removal efficiency and shorten the treatment time by simultaneously forming aerobic, microcellular group, anoxic conditions in the same reaction tank.

Claims (10)

In the method for biological purification of sewage and wastewater, comprising an anaerobic tank (1) in which organic substances are decomposed and phosphorus released, an aeration tank (2) having an immersion rotary medium, and a settling tank (3) having a sludge conveying facility line, In the aeration reaction tank (2), a fully immersed rotary medium assembly (17) is installed, but the surface area of the fully immersed rotary medium assembly (17) and the volume ratio of the aeration reaction tank are optimized to 10 to 15 l / m ² , and the DO concentration outside the aeration tank is It is maintained at 0.5 ~ 1.5 mg / l, and MLSS concentration is controlled to 3000 ~ 6000 mg / l (6,000 ~ 12,000 mg / l with attached microorganism) according to organic material load. A method for biological purification by optimizing the volume of a completely immersed rotary medium and reaction tank, which simultaneously removes organic matter, nitrogen and phosphorus from sewage and wastewater by allowing microaeration and anoxic conditions to be simultaneously formed. The purification method according to claim 1, wherein in the anaerobic tank (1), an inlet baffle (7), an agitator plate (13), a stirring motor (8), a detachable flange (9), a stirrer shaft (10), and a stirring blade (11), the support metal box 12, etc. are provided and the MLSS concentration in the anaerobic tank 1 is maintained by the sludge conveying apparatus 4, but the stirrer speed of the anaerobic tank is 30 to 90 RPM, and the residence in the anaerobic tank 1 is maintained. The time (HRT) is about 1 ~ 3hr depending on the change of influent, and the sludge return rate from the sedimentation tank 3 to the anaerobic tank 1 is maintained at 50 ~ 100% to remove organic substances, nitrogen and phosphorus in sewage and wastewater at the same time. Biological purification treatment method by optimizing the complete immersion type rotary medium and the reaction tank volume. delete In the biological purification treatment device for sewage and wastewater, comprising an anaerobic tank (1) in which organic substances are decomposed and phosphorus released, an aeration reaction tank (2) having an immersion rotary medium, and a settling tank (3) having a sludge conveying line, The rotating medium assembly 17 capable of simultaneously performing reactions such as oxidation, phosphorus intake, nitrification and denitrification of organic substances by forming aerobic, microcellular phase, and anoxic conditions of the object to be passed through the anaerobic tank 1 is performed. The rotary medium assembly 17 has a plurality of flat plate media and 59 of a disk structure having a rough surface and are spaced apart by a predetermined distance. And a media disc-shaft support wheel (60), the speed control for transmitting power to the shaft (56) of the fully immersed rotary medium assembly (17) from the outside of the aeration tank to rotate the medium. A media assembly driving apparatus having a media assembly driving apparatus 21 capable of doing this; The shaft and sleeve 32 are coupled to the outside of the aeration tank 2 to maintain watertightness between the shaft 56 and the reactor wall through which the shaft passes, and the sleeve 32 and the shaft 56 And a grand packing assembly for retaining watertightness by combining O-rings 39 to maintain watertightness, and for combining watertightness between the outer wall of the sleeve 32 and the packing box 33 to maintain watertightness. Fixing the assembly 18 and a gland packing 29 and a gland packing bolt 35; It is composed of aeration device consisting of a diffuser (25), a membrane rod diffuser (24), a blower (27), an air flow control valve (26), and aeration device baffle (23) for blowing air into the aeration tank (2). Biological purification treatment apparatus through the optimization of the volume of the complete immersion-type rotating medium and the reaction tank. delete delete The method of claim 4, wherein when the aeration reactor (2) is operated for two or more axes, the two-axis fully immersed rotary medium assembly (17) is operated with one drive motor by using the universal joint coupling (28). Biological purification treatment apparatus by immersing a fully immersed rotary medium and the reactor volume optimization. delete In the method of operating a biological purification treatment device for sewage and wastewater, comprising an anaerobic tank (1) in which organic substances are decomposed and phosphorus released, an aeration reactor (2) having an immersion rotary medium, and a settling tank (3) having a sludge conveying line. In Water by the rotation of the immersion type rotating medium assembly is secured by securing various concentrations of microorganisms with high concentration and high density in the fully immersion type rotating medium assembly 17 and adjusting the rotational speed to 0.05 to 0.3 m / sec by the deceleration driving motor and the inverter 46. It generates shear force to prevent the over-adhesion of the active microbial film (Bioflim) of a certain thickness, and the aeration tank having the fully immersed rotating medium assembly 17 is the surface area of the fully immersed rotating medium assembly 17 and the aeration reaction tank. Optimize the volume ratio of to 10-15 l / m2, and maintain the MLSS concentration at 3000-6000 mg / l (6,000-12,000 mg / l with attached microorganisms) according to the load of organic matter, and the DO concentration is 0.5-1.5 mg. / l range to form anoxic conditions at the center of the media assembly of the reactor and microcellular phase and aerobic conditions at the outer part of the reactor. About 6 hours, the medium rotation assembly and fully submerged rotating medium and the biological purification method through the reaction tank capacity optimization, characterized in that for performing a forward-flow turning abandoned. delete