KR20010109976A - Nutrients removing method and apparatus from sewage and industrial waste water - Google Patents

Abstract

Simultaneous removal method of nitrogen and phosphorus in sewage, sewage, and wastewater according to the present invention are provided with carriers 22 and 32 in the oxygen-free filter 20 and the aerobic biooxidation filter 30, respectively. Denitrification is carried out by the denitrification microbial membrane formed on the carrier 22 of the oxygen-free filter 20, and phosphorus by aerobic bacteria under the anaerobic-aerobic state formed in the pores of the carrier 32 of the aerobic biooxidation filter 30 It is possible to construct an advanced treatment apparatus that improves the water quality by releasing phosphorus through release and excess intake and physical filtration.

Description

NUTRIENTS REMOVING METHOD AND APPARATUS FROM SEWAGE AND INDUSTRIAL WASTE WATER}

The present invention relates to domestic sewage, sewage, and various industrial wastewater treatment methods and apparatus, and in particular, sewage, sewage, and wastewater to enable efficient water purification with a simple configuration by performing physical filtration and biofilm treatment in one device. The present invention relates to a method for removing nitrogen and phosphorus simultaneously and a device thereof.

As population growth and industrial development, emissions of industrial wastewater, industrial wastewater, livestock wastewater and leachate, and various organic wastewater are increasing rapidly. Therefore, the amount of nitrogen and phosphorus flowing into the water increases day by day, and even though the increased nitrogen and phosphorus are essential nutrients of living organisms, if they are excessively discharged in the natural world without proper treatment, eutrophication is caused and the water quality of algae is increased. Increase pollution. The water that has undergone eutrophication is not suitable for water supply because of the blockage of the filter paper and the taste of the constant water as well as the bad smell, which is not suitable as a source of water as well as the rapid proliferation of algae, which consumes dissolved oxygen in the water. It causes the mass death of living things.

Therefore, sewage, sewage, and waste water must be purified and introduced into rivers and water sources, and treatment methods and devices are developed to prevent eutrophication by simultaneously treating nitrogen and phosphorus when purifying sewage, sewage, and wastewater. Reached.

Figure 1 shows a form of a conventional representative sewage treatment process that can simultaneously process nitrogen and phosphorus, as shown, the primary settling tank (1), bioreactor (2), secondary settling tank (3) and The tertiary filtration unit 4 is provided in sequence, and the bioreactor 2 is generally composed of an anaerobic tank 2a, an anaerobic tank 2b, and an aerobic tank 2c.

When the effluent water from which the suspended solids are removed in the primary settling tank 1 is introduced into the anaerobic tank 2a in the treatment apparatus as described above, organic matter is ingested and decomposed by the microorganisms, and at the same time, the release of phosphorus is released. In addition to the growth of microorganisms, phosphorus is removed by overingesting polyphosphoric acid in the microorganisms. In other words, microorganisms involved in the removal of phosphorus have the ability to remove simple enzyme substrates in the anaerobic state, releasing phosphorus while assimilating it as a storage product in the cell, and in the aerobic state, phosphorus is ingested and stored in the form of multiple phosphates. Is removed.

Nitrogen removal is carried out by nitrification of nitrogen compounds in sewage and effluents by nitrifying microorganisms such as nitrosofying bacteria and nitrify bacteria in the aerobic state in the aerobic tank (2c) and then back to anoxic tank (2b). This is achieved by being denitrified by a denitrification microorganism such as Achromobacter or Pseudomonas in the anaerobic state after being returned to a certain amount.

As described above, the nitrogen and phosphorus-free microbial mixture is separated into solids by sedimentation treatment in the secondary sedimentation tank 3 so that the microorganism and the treated water are separated. Finally, it is treated in (4) and managed to discharge below the discharge standard.

However, the conventional wastewater advanced wastewater treatment method has a problem of having a complicated facility to maintain the water quality of the effluent discharged to the river below the reference value.

The main object of the present invention devised in view of the above problems is to perform the biological treatment for the removal of nitrogen and phosphorus in the effluent and the physical filtration for the improvement of water quality at the same time in one device, simplifying the advanced treatment process and apparatus The present invention provides a method and apparatus for simultaneously removing nitrogen and phosphorus from sewage, wastewater and wastewater to reduce facility installation costs according to the reduction of facilities and increase space utilization efficiency due to the reduction of installation space.

It is another object of the present invention to provide sewage and sewage, which is suitable as a natural purification treatment method for purifying water by allowing a sufficient amount of microorganisms to maintain aerobic capacity while the effluent flowing through the carrier flows downward from the top of the carrier. The present invention provides a method for simultaneously removing nitrogen and phosphorus from wastewater, and an apparatus thereof.

1 is a layout view schematically showing a conventional sewage treatment apparatus.

Figure 2 is a block diagram showing the configuration of the simultaneous removal of nitrogen, phosphorus in the sewage and sewage, waste water of the present invention.

Figure 3 is a cross-sectional view showing a carrier according to the present invention.

4 is a cross-sectional view for explaining the operation of the present invention.

Explanation of symbols on the main parts of the drawings

10: first settler 20: oxygen-free filter

30: aerobic biooxidation filter 40: treatment tank

22,32 carrier

In order to achieve the object of the present invention as described above, in the first sedimentation, anoxic filter, aerobic biooxidation filter, a treatment tank using sewage and sewage and wastewater, the upstream from the inner bottom of the aerobic biofiltration filter The raw water flows downwardly from the upper side of the carrier to which the aerobic microorganisms are attached, so that the raw water flows into the air in a state of supplying air to the air, thereby promoting the uptake and decomposition reaction of organic contaminants, the nitrification of nitrogen compounds, and the removal of phosphorus by the aerobic microorganisms. Physical filtration is carried out at the same time, nitrified nitrified water in the aerobic biooxidation filter is denitrified by denitrification by circulating 0.2 ~ 3 circulating water compared to the influent in an oxygen-free filter, depending on the flow rate required to remove nitrogen. Nitrogen and phosphorous simultaneous in sewage and wastewater, characterized in that This method is provided.

In addition, in the sewage and sewage and wastewater treatment apparatus using an initial settler, anoxic filter, aerobic biofiltration paper, and a treatment tank, for performing biofilm treatment with physical filtration of effluent inside the aerobic biooxidation filter and anoxic filter bed. Provided is a simultaneous removal apparatus for nitrogen and phosphorus in sewage and wastewater, characterized in that the carrier is provided.

Hereinafter, the present invention as described above in more detail with reference to the embodiments of the present invention, sewage and sewage, wastewater nitrogen, phosphorus simultaneous removal method and apparatus thereof as follows.

Figure 2 is a block diagram showing the configuration of the simultaneous removal of nitrogen, phosphorus in the sewage and sewage, wastewater of the present invention, Figure 3 is a cross-sectional view showing a carrier according to the present invention, Figure 4 is a cross-sectional view for explaining the operation of the present invention As shown, the initial settler 10, the oxygen-free filter 20, the aerobic biooxidation filter 30, the treatment tank 40 are sequentially arranged, these are transfer pipes (11) (21) (31) Inlet pipe 12 is provided on the inlet side of the initial settler 10, and discharge pipe 42 is provided on the outlet side of the treatment tank (40).

The lower portion of the treatment tank (40) is provided with an effluent circulating means (50) for circulating a certain amount of effluent into the anaerobic filter (20), and a back washing means (50) for backwashing the aerobic biooxidation filter paper ( 60), aerobic maintenance means 80 for supplying air to the backwash water discharge means 70 and the aerobic biooxidation filter 30 for discharging the backwash water is provided.

The inside of the oxygen-free filter 20 is filled with a porous medium with a carrier 22 to inhabit denitrifying bacteria, and inside the aerobic biooxidation filter 30 to form an aerobic microbial membrane with physical filtration. As shown in FIG. 3, the carrier 32 formed by stacking the porous medium layer 32a, the royal sand layer 32b, and the gravel layer 32c is filled, and the lower collecting device 23 is disposed below the carriers 22 and 32, respectively. 33 is provided.

The circulation means 50 is a circulation line 51 connecting the lower end of the treatment tank (40) and the outlet pipe (11) of the initial settler (10), and a circulation pump (52) installed on the circulation line (51). And valves 53 and 54 provided at the front and rear of the circulation pump 52.

The backwashing means (60) is a compressor (62), an air storage tank (63), a flow indicator (64), which is installed on an air pipe (61) connected to one side of the lower end of the aerobic biooxidation filter (30), and automatic. A backwash pump 67, a valve 68: 68 ', installed on the valve 65, the washing water supply line 66 connected to the circulation line 51 and the lower side of the aerobic biofiltration paper 30; 68 ", 68 '").

The backwash water discharging means 70 is connected to the backwash water discharge line 73 and the backwash water tank 72 installed outside and the trap is disposed on the upper inside of the aerobic biooxidation filter (30) In addition, the backwash tank 72 is connected to the inlet pipe 12 of the initial settler 10 by a pumping pipe 74, and the pumping pipe 74 is provided on the pumping pipe 74, respectively Valves 76, 77, 78 are provided in the connecting pipe.

The aerobic maintenance means 80 is an aerobic maintenance pipe 81 for connecting one side of the air pipe 61 and the aerobic biooxidation filter 30, the valve 83 and the flow rate indicator for adjusting the air supply amount 84 It consists of.

In addition, the opening degree of the air supply amount control valve 83 is adjusted by the dissolved oxygen detector / regulator 82 provided on the upper portion of the treatment tank 40.

The process by the nitrogen and phosphorus simultaneous removal apparatus of sewage, wastewater and wastewater of this invention comprised as mentioned above is demonstrated.

When sewage and sewage and waste water enter the initial settler 10 through the inlet pipe 12, the solid matter is precipitated and removed from the inner bottom of the initial settler 10, and the effluent is discharged through an outflow pipe 11 to obtain an anaerobic filter ( 20) flows into the interior.

In the oxygen-free filter 20, the circulated water circulated in the treatment tank 40 along with the effluent from the initial settler 10 passes through the carrier 22 and is physically filtered and attached to the carrier 22 to form a biofilm. The denitrification of the nitrified nitrates in the aerobic biooxidation filter (30) by the denitrifying bacteria forming the nitrogen gas is released into the atmosphere to remove the nitrogen in the sewage or waste water.

When the denitrified effluent from the anaerobic filter 20 flows into the aerobic biooxidation filter paper 30 through the transfer pipe 21, the effluent flows downward as shown by the arrow on the upper side of FIG. While passing through the porous medium layer 32a, the sand layer 32b, and the gravel layer 32c, which are the carrier 32, physical filtration is performed and at the same time, adsorption oxidation of organic substances and growth of microorganisms are performed by the microorganisms.

In addition, the nitrogenous material contained in the sewage in the form of ammonia nitrogen is oxidized to nitrite nitrogen or nitrate nitrogen, which is oxidative nitrogen, by the nitrifying microorganisms, which are aerobic microorganisms, in the aerobic biooxidation filter (30). And flows into the treatment tank 40 through the circulation tank 51 and the circulation pump 52 in the treatment tank 40, and a certain amount is circulated to the anaerobic filter 20, in the anaerobic filter 20 Under anoxic conditions, the nitrate nitrogen is reduced by the denitrifying microorganisms and is released in the form of nitrogen gas, thereby removing nitrogen gas.

On the other hand, the removal of phosphorus in the anaerobic-aerobic state formed in the porous medium proceeds to release the phosphorus and excess intake, so that the discharged water discharged to the stream through the discharge pipe 42 is discharged in the state of nitrogen and phosphorus removed .

The circulating water circulated to the anaerobic filter 10 in the effluent flowing into the treatment tank 40 in the aerobic biooxidation filter 30 is to adjust the circulation rate according to the required denitrification degree, the circulation amount is 0.2 to 3 times compared to the influent It is desirable to adjust in between.

The aerobic biooxidation filter (30) is such that the air generated by the compressor 62 and the air storage tank 63 is introduced into the carrier 32 through the aerobic maintenance pipe (81), dissolved oxygen detection / The controller 82 is used to detect the concentration of dissolved oxygen in the effluent flowing into the treatment tank 40 to adjust the appropriate air injection rate.

On the other hand, if the pores of the filtration layer is clogged by the growth of microorganisms attached to the carrier 32 of the aerobic biooxidation filter (30) operating as described above to form a microbial membrane, the loss of the filtration head of the effluent is gradually increased. When the value reaches the design level, the backwash of the carrier 32 is performed.

When backwashing, first, close the valve 83 of the aerobic maintenance pipe 81 and open the valve 65 of the air piping 61 so that the air flows into the lower side of the aerobic biooxidation filter 30. Passed from the lower side to the upper side 32 and shakes the microorganisms attached to the carrier 32 so that the microorganisms fall from the carrier 32.

In such a state, when the valve 68 of the washing water supply line 66 and the valve 78 of the backwash water discharge pipe 73 are opened and the backwash pump 67 is operated, the inner lower portion of the aerobic biofiltration filter 30 is opened. The backwash water is supplied, and the supplied backwash water flows from the lower side of the carrier 32 to the upper side and flows upward with the separated microorganisms, and the level of the backwash water flowing upward is set at the installation height of the trap. When the backwash water is reached, the backwash water is discharged to the backwash tank 72 through the trap (71) and the backwash water discharge pipe (73), and the backwash water discharged to the backwash tank (72) is transferred to the conveying pump (75). Is pumped back to the inlet 12.

In the above embodiment, a porous medium is used as the carrier 22 filled in the anoxic filter 20, and a porous medium, royal sand, and gravel are stacked as the carrier 32 filled in the aerobic biofiltration paper 30. For example, but not necessarily limited thereto, denitrification bacteria may inhabit the inside of the anaerobic filter 20 by adding an anthracite layer, and form an aerobic biofilm inside the aerobic biooxidation filter paper 30. In addition, any configuration capable of physical filtration can be applied to any number within the scope without departing from the spirit and scope of the present invention.

As described in detail above, the present invention provides a method for simultaneously removing nitrogen and phosphorus from sewage, sewage, and wastewater, and a device thereof, which includes a carrier for biofilm treatment simultaneously with physical filtration in an anaerobic filter and aerobic biooxidation filter paper, By simultaneously removing nitrogen and phosphorus in the wastewater and physical filtration, the discharged water quality is kept below the statutory discharge water quality standard, resulting in red tide and green algae caused by adverse effects of water or abnormal growth of microorganisms. It is effective in preventing the destruction of the water environment.

In addition, the present invention has the effect of reducing the manufacturing cost, installation area is simple because the structure is simple compared to the conventional high processing apparatus.

Claims (4)

In the method of treating sewage, sewage, and wastewater using an initial settler, an anoxic filter, an aerobic biofiltration paper, and a treatment tank, the raw water is supplied in a state in which air flows upward from the inner lower portion of the aerobic biooxidation paper. The aerobic microorganism is allowed to flow downward from the upper portion of the carrier to which the aerobic microorganism is attached, and the microorganism is ingested by the microorganism in the filtrate and promotes nitrification of nitrogen compounds and removal of phosphorus under the anaerobic-aerobic state of the porous media. Physical filtration is carried out at the same time, and the denitrification reaction by denitrification bacteria is carried out by circulating the treated water of the biooxidized filter by 0.2 ~ 3 times compared to the influent by the denitrification of nitrogen oxide nitrified in the aerobic biooxidant filter. Simultaneous removal of nitrogen and phosphorus in sewage and wastewater. The method of claim 1, wherein the amount of air supplied to the carrier of the aerobic biooxidation filter is reduced according to the detection value of the dissolved oxygen concentration of the effluent flowing into the treatment tank from the aerobic biooxidation filter to save energy. Simultaneous removal of nitrogen and phosphorus from sewage and wastewater. In the sewage and sewage and wastewater treatment apparatus using an initial settler, anoxic filter, aerobic biofiltration paper, and a treatment tank, carriers for physical filtration and biofilm treatment are respectively provided in the aerobic biooxidation paper and anoxic filter bed. Simultaneous removal of nitrogen and phosphorus from sewage and wastewater. The apparatus of claim 3, wherein the carrier is any one of a porous media layer or a porous media layer, a royal sand layer, and a gravel layer, which are sequentially stacked.