KR100759847B1 - Advanced swage and waste water treatment method and apparatus with improved anaerobic basin and recirculation part. - Google Patents

Abstract

An apparatus and a method for advanced treatment of swage and wastewater are provided to allow phosphorous to be completely released from the anaerobic tank although the recirculation of sewage and waste water from an anoxic tank to an anaerobic tank is skipped or minimized, and increase removal ratios of nitrogen and phosphorous by substantially increasing amounts of sewage and wastewater recirculated from an aerobic tank to the anoxic tank at the lower consumption of power. An apparatus for advanced treatment of swage and wastewater having improved anaerobic tank and recirculation part comprises: a bioreactor(20) divided into the anaerobic tank, the anoxic tank and the aerobic tank by partitions; a final settling basin connected to the rear of the bioreactor; a flow distribution ratio tank(16) installed adjacently to one side of the anaerobic tank, a preliminary denitrification tank(17) in which an agitator(17-1) is installed, and a mixing tank(18) in which an agitator(18-1) is installed; an inflow channel(19) connecting the mixing tank and the anaerobic tank; an anaerobic tank(21) which is installed within the bioreactor adjacently to the front side of the final settling basin, and in which an agitator(21-2) is installed; an anoxic tank(22) which is connected to the anaerobic tank, in which an agitator(22-1) is installed, and which has a recirculation pump installed in an opening thereof to the aerobic tank; an aerobic tank(23) which is connected to the anoxic tank, and in which an air diffuser(24) is installed; an air pipe(25) and a blower(26) supplying air to the air diffuser; a final settling basin(30) installed adjacently to the aerobic tank; pipes(32,33) and a return sludge pump(34) drawing out settled sludge from a sludge hopper(31) in front of the final settling basin, and transferring sludge to the preliminary denitrification tank; and a disinfection tank connected to the final settling basin.

Description

{Advanced swage and waste water treatment method and apparatus with improved anaerobic basin and recirculation part. }

1 is a plan view of the waste water treatment apparatus according to the present invention.

Figure 2 is a detailed plan view of the main part, such as a microbial reaction tank according to the present invention.

3 is a longitudinal sectional view according to the present invention;

Figure 4 is a longitudinal cross-sectional view of the aerobic tank and anaerobic tank connection in accordance with the present invention.

5 is a schematic view showing a process configuration according to the present invention.

<Description of the code | symbol about the principal part of drawing>

11. Pickling place 12. Flow adjustment tank

13, inlet pipe 14. Flow distribution tank

15. Inflow branch piping 16. Ratio distribution tank

16-1. Small Distribution Weir 16-2. Large distribution weir

17. Preliminary Denitrification Tank 17-1. Preliminary denitrification agitator

18. Mixing tank 18-1. Mixer Stirrer

19. Influent channel 20. Microbial reactor

21. Anaerobic Tank 21-1 Inflow Electric Sluice

21-2. Anaerobic agitator 22. Anaerobic bath

22-1. Anaerobic Tank Agitator 23. Aerobic Tank

24. Air diffuser 25. Air piping

26. Blower 27. Recirculation pump

30. Final Settling Basin 30-1. Underground plumbing

30-2. Rectifying Wall 30-3. Sludge collector

30-4. Scum eliminator

31. Sludge Hopper 32. Sludge Drawing Tube

33. Sludge conveying line 34. Return sludge pump

35. Returned sludge discharge pipe 36. Supernatant water collecting device

37. Supernatant discharge pipe

40. Sterilizers 41. Sterilizers

42. Discharge flow meter

end. Exhalation tank extension b. Anaerobic entrance

All. Anaerobic entrance; Hogijo Inlet

hemp. Exhalation, anaerobic connection opening

The present invention and, in a waste water treatment technology, particularly relates to an improvement of A. ₂ / O method relates to a high level treatment for removing the nitrogen and phosphorus.

When nitrogen and phosphorus are present in the water, algae are generated and reproduced in large quantities by the action of the sun's rays in fresh or sea water, causing dissolved oxygen depletion and toxins in the water, and causing odors in the water. The removal of nitrogen and phosphorus from the water is very important for the protection of the fish family and the aquatic ecosystem, and the treatment to remove nitrogen and phosphorus, the nutrients that cause this from the sewage, is called advanced treatment.

A method of removing nitrogen and phosphorus from wastewater are the emission line denitrification and widely used in the high treatment of conventional sewage to perform nitrification and this basic technology as the A ₂ / O, and this strain associated with the anaerobic and the anoxic tank and the aerobic tank There are also treatment methods such as improved UCT and VIP.

Either process achieves sufficient nitrification in the aerobic tank, sufficient phosphorus release in the anaerobic tank and inflow from the anaerobic tank. Recirculation and denitrification of 1 to 6 times the amount of wastewater is carried out, and in the aerobic bath, luxury uptake of phosphorus should occur simultaneously with nitrification.

Describing the nitrogen removal process in detail, ammonia is oxidized to nitrate nitrogen by an autotrophic bacterium that causes nitrification in an aerobic tank, and when it becomes anaerobic, denitrification bacteria ingest about three times the amount of organic matter in the sewage and in this process By consuming the bound oxygen of (NO ₃ ), nitrate nitrogen (NO ₃ ) loses oxygen molecules and becomes nitrogen gas (N ₂ ), which is released into the atmosphere to remove nitrogen.

In the process of phosphorus removal, phosphorus-removing microorganisms in the anaerobic tank consume organic energy using energy generated when decomposing Poly-P accumulated in the cell, store it in the body, and release free orthophosphate out of the cell. Phosphorus concentration increases.

When the surrounding environment changes to an aerobic state, the phosphorus-removing microorganisms decompose organic matter (PHB) stored in the body to synthesize ATP, ingest the phosphoric acid in sewage, and synthesize Poly-P while absorbing 2 to 6 times more phosphorus. This phenomenon is referred to as luxury uptake and the excess intake of phosphorus is removed as excess sludge outside the sewage treatment system to remove phosphorus from sewage.

In order to effectively remove phosphorus from sewage, phosphorus should be discharged smoothly in anaerobic tank and excess intake of phosphorus should occur in aerobic tank. If dissolved oxygen and nitrate are present in anaerobic tank, the activity of phosphorus removing bacteria will be inhibited and it will not release phosphorus sufficiently. Disruption of phosphorus

The presence of more than 2.5mg / L of nitrate nitrogen in anaerobic tanks has been studied and reported to inhibit the phosphorus release of phosphorus-removing bacteria.

In order to solve this problem, the A ₂ / O method limits the amount of returned sludge to 20-50% to reduce the effects of dissolved oxygen and nitrate nitrogen.In the UCT and VIP methods, the returned sludge is returned to the anaerobic tank without being returned to the anaerobic tank. In the anaerobic tank, the mixed solution from which nitrate and dissolved oxygen have been removed is supplied to the anaerobic tank to reduce the effect.

In the A ₂ / O method, the effects of dissolved oxygen and nitrate nitrogen are inevitable to some extent in the anaerobic tank, and the amount of returned sludge may exceed 50% due to the MLSS concentration or other sedimentation of the microbial reactor. Phosphorus release may be incomplete.

In the UCT or VIP method, a separate pump and piping are required to circulate the mixed liquid from an anaerobic tank to an anaerobic tank, which is complicated in structure and cumbersome to operate, and circulates the mixed liquid mixed with wastewater and a large amount of return sludge and circulating water to an anaerobic tank. In order to discharge phosphorus sufficiently, a large amount of circulating water of inflow and wastewater has to be sent to the anaerobic tank, which leads to an increase in power consumption.

In addition, when the recirculation rate was increased to increase the nitrogen removal rate, the pressure loss was increased due to the use of pumps and pipes, resulting in an uneconomical increase in power consumption.

The present invention eliminates or minimizes the recirculation of an anaerobic tank to an anaerobic tank in the advanced treatment of sewage and wastewater, and completely releases phosphorus in the anaerobic tank and increases the recycle rate from the aerobic tank to the anaerobic tank with a small consumption power to increase the removal rate of nitrogen and phosphorus. One is to provide an apparatus and method for advanced treatment of wastewater.

To this end, the present invention installs a preliminary denitrification tank at the front end of the anaerobic tank, and supplies a part of the influent sewage and return sludge to the preliminary denitrification tank and secures a suitable residence time, and then mixes it homogeneously with the remaining influent sewage in the combined mixing tank after denitrification. The purpose of the present invention is to increase the removal rate of phosphorus by transporting it to an adjacent anaerobic tank to completely release phosphorus from the anaerobic tank.

In addition, the present invention comprises a preliminary degasser and mixing tank, microbial reaction tank and final sedimentation basin, and sludge conveyance and internal circulation, the microbial reactor is composed of anaerobic tank, anoxic tank, aerobic tank, and the final sedimentation tank is sludge hopper and sludge conveyance on the front bottom Install the device and install the symbol water collecting device at the rear end, install the anaerobic tank and anaerobic tank on one side by dividing the microbial reactor into two in the vertical direction, install the aerobic tank on the other side, and install the anaerobic tank adjacent to the front of the final settling basin. In order to connect the anaerobic tank, install an anaerobic tank, connect the anaerobic tank and the recirculation tank, install the end of the aerobic tank and the start of the anaerobic tank, connect it with a recirculation pump, and recycle the waste water. The aim is to minimize losses.

In addition, the present invention aims to increase the nitrogen removal rate by increasing the recycle ratio.

The present invention to achieve the above technical problem,

Sewage and wastewater (hereinafter referred to as wastewater) from which sediments and sands have been removed from the sedimentation basin are introduced into the flow control tank and transported to the treatment plant by inflow pumps. In the wastewater treatment facility,

The main components of the wastewater treatment plant are preliminary denitrification tank, mixing tank, microbial reaction tank, final sedimentation basin, sludge conveying apparatus and internal circulation system, but the microbial reaction tank is composed of anaerobic tank, anaerobic tank and aerobic tank;

Install the anaerobic tank on the one side adjacent to the final sedimentation basin, connect the anaerobic tank to the rear end of the anaerobic tank, connect the aerobic tank to the anaerobic tank on the other side, and connect the final sedimentation basin to the rear end of the aerobic tank. , The beginning of the anaerobic tank and the rear end extension of the aerobic tank are installed to be connected to each other, and the opening is formed in the connecting portion, and the recirculation pump is installed in the opening, and the ratio distribution tank and the pre-denitrification tank and the mixing tank are installed adjacent to the anaerobic tank, and mixed To the tank and the anaerobic tank,

The anaerobic tank stirrer 21-2 is installed at the bottom of the anaerobic tank, and the anaerobic tank stirrer 22-1 is installed at the bottom of the anaerobic tank, and the aerobic tank apparatus of diminishing type in which the amount of air decreases from the front to the rear is reduced. Install it;

Influx Ha. Waste water is distributed evenly by each series in the flow distribution tank (14), flows into the ratio distribution tank (16) through the inlet branch pipe (15), and part of the preliminary denitrification tank (17) in the ratio distribution tank (16). And the remainder are supplied to the mixing tank 18, and the activated sludge conveyed from the return sludge pump 34 is mixed with wastewater from the preliminary denitrification tank 17, denitrated, and then transferred to the mixing tank 18. The waste water, which is mixed evenly in the mixing tank 18, is transferred to the anaerobic tank 21 through the inflow electrolytic water gate 21-1 via the inflow channel 19; And

In the anaerobic tank 21, after stirring with an anaerobic tank stirrer 21-2, the wastewater flows into the anoxic tank 22 which is connected, and is returned to the internal circulation pump 27 from the aerobic tank extension part a of the aerobic tank. After mixing with an oxygen-free tank stirrer (22-1) and introduced into the connected aerobic tank (23), in the aerobic tank was abandoned in a tapered manner by the aerator device 24, the wastewater is introduced into the final sedimentation basin (30) connected to the sludge Precipitated and the supernatant flowed out, and the settling sludge was collected in the sludge hopper 31 and recycled with the improved denitrification tank and recycled to the conveying sludge pump 34 through the sludge drawing pipe 32 and the sludge conveying pipe 33. The present invention provides a method and apparatus for treating wastewater with waste.

The configuration and operation of the present invention will be described in detail as follows. (See [Fig. 1] to [Fig. 4].)

Ha. Wastewater flows into the settlement 11, where foreign matters such as contaminants and sand are removed, and then flows into the flow control tank 12.

The lower flowed into the flow adjustment tank (12). Waste water is pumped into the inflow pump and is transferred to the flow distribution tank 14 through the inflow pipe 13, and the flow distribution tank 14 is distributed evenly by each series. The wastewater was sent to the ratio distribution tank 16 through the inlet branch pipe 15.

The lower flowed into the ratio distribution tank 16. Part of the waste water was transferred to the preliminary denitrification tank 17 and the rest was transferred to the mixing tank 18. The preliminary denitrification tank 17 was pumped from the part, the wastewater and the conveying sludge pump 34 to the conveying sludge discharge tube. The conveyed sludge introduced through (35) was stirred for a predetermined time by the preliminary denitrification tank stirrer (17-1) in the anaerobic state, and then introduced into the mixing tank (18) for a predetermined time in the inflow, wastewater and anaerobic state. The mixture was stirred for a while, mixed evenly, and then transferred to the anaerobic tank 21 through the inlet electric water passage 21-1 through the inlet electric water gate 21-1.

The anaerobic tank 21 was provided with an anaerobic tank stirrer 21-2 at the bottom thereof so as to completely mix the introduced wastewater and wastewater.

After passing through the anaerobic tank 21, the wastewater flows into the anaerobic tank 22 which is connected and installed through the anaerobic tank inlet (C), and the anaerobic tank stirrer 22-1 is installed at the bottom of the anaerobic tank 22, and the anaerobic tank 22 ) And the aerobic tank extension part (a) are connected to the recirculated water flowing through the aerobic and anoxic tank connection opening (e) and the bottom and waste water are completely mixed by the anoxic tank agitator 22-1. .

After passing through the anaerobic tank 22, the wastewater flowed in front of the connected aerobic tank 23 and flowed down by the air dispersing device 24.

After passing through the aerobic tank 22, the wastewater is introduced into the final sedimentation basin 30 through the rectifying wall 30-2, and sludge from the final sedimentation basin is collected and collected into the sludge hopper 31, and the symbol water is a symbol water collecting device ( 36) was discharged through the disinfection tank 40 to disinfect and kill the coliform group was discharged as effluent.

The sludge collected in the sludge hopper 31 is pumped by the sludge drawing pipe 32 and the conveying sludge pump 34 connected to the sludge conveying pipe 33 and the preliminary denitrification tank 17 through the conveying sludge discharge pipe 35. To be transferred.

Referring to the operation of the present invention in detail as follows.

After the sand and contaminants have been removed from the settlement, the wastewater is distributed in an equal amount for each series in the flow distribution tank 14 and flows into the ratio distribution tank through the inflow branch pipe 15 and has a small width in the ratio distribution tank 16. The wastewater flows into the preliminary denitrification tank 17 through a distribution weir width ratio 16-1 and a large distribution weir 16-2, passing through a small distribution weir 16-1. After passing through the large distribution weir 16-2, the wastewater is introduced into the mixing tank 18.

The conveying sludge pumped by the conveying sludge pump 34 is supplied to the preliminary denitrification tank 17 through the conveying sludge discharge pipe 35, and the conveying sludge and the lower and waste water are supplied to the preliminary denitrification tank stirrer in the preliminary denitrification tank 17. 17-1), while staying in a completely mixed state for a certain time, the organic matter in the wastewater is partially ingested by the aerobic bacteria in the conveying sludge, so that a small amount of dissolved free oxygen existing in the conveying sludge is consumed first and dissolved. In the anaerobic state in which free oxygen is lost, the denitrification effect of the removal of nitrogen occurs by the action of denitrification bacteria, which is converted into nitrogen gas and released into the atmosphere.

The return sludge contains aerobic bacteria, nitrifying bacteria (nitrosomonas, nitrobacter, etc.) and communicable bacteria (such as bacteria capable of surviving other aerobic and anaerobic conditions) such as denitrifying bacteria. If present, nitrate nitrogen is the denitrification process by the action of denitrification bacteria.

After denitrification in the preliminary denitrification tank 17, the wastewater flows into the mixing tank 18 and flows in through the large distribution weir 16-2, under the action of the mixing tank stirrer 18-1 with the wastewater. The mixture is homogeneously mixed and then flows into the anaerobic tank 21 through the inlet electric sluice 21-1 through the inflow channel 19.

In the ratio distribution tank 16, the ratio between the small distribution weir 16-1 and the large distribution weir 16-2 is determined as follows.

For example, if the total nitrogen (TN) concentration in wastewater is 36 mg / L under inflow, and the nitrification rate is 100% in the microbial reactor, the total nitrogen removal rate is 75% and the return rate of the return sludge is 50%. The total amount of nitrogen contained in the return sludge (the same as the amount of nitrate nitrogen since the nitrification rate is assumed to be 100%), the total nitrogen residual rate and the return rate of the return sludge, It is equal to the product, and the ratio of the total amount of nitrogen introduced into the return sludge is as follows.

Nitrate nitrogen in the return sludge / amount of total nitrogen introduced = (100-75) x 50/100 = 12.5%

Therefore, to be denitrified, the preliminary denitrification tank 17 has to be supplied, and the ratio of waste water is 12.5% of the influent sewage.

Since the nitrogen removal rate is usually 75 to 90% and the sludge return ratio is 50 to 100%, the ratio of waste water is supplied to (100- (75 to 90) × ((50 to 100) / 100) = 5 It is-25%.

Therefore, the small distribution weir 16-1 is 5 to 25% of the total distribution weir width, and the total nitrogen removal rate and the return ratio of the return sludge are predetermined in the design of the wastewater treatment plant. The ratio can also be determined in the above-described manner, and if the ratio is set to the maximum sludge return ratio, the lower sludge return ratio can lead to complete denitrification in the preliminary denitrification tank even if the operation is carried out without condition modification.

In addition, if it is necessary to change the conveying ratio of the conveying sludge during operation, there is a method of installing a variable width weir that can vary the width of the small dispensing weir 16-1 and the large dispensing weir 16-2. (Not shown).

Here, comparing the various indicators of the conventional A2 / O, UCT, VIP process and the advanced treatment process of the present invention is shown in the following <Table 1>.

<Table 1> Comparison of Nitrogen and Phosphorus Advanced Treatment Processes

The present invention provides a recycling ratio 1, which is an advantage of the A ₂ / O process by installing a preliminary denitrification tank as shown in Table 1 above, inflowing, mixing and denitrifying some of the wastewater, and treating the remaining sewage in an anaerobic tank. Even without this, it was solved that phosphorus release was inhibited in the anaerobic tank, which is a drawback of the A ₂ / O process.

In addition, compared to UCT or VIP process, recycling ratio 1 is omitted, so the structure is simple, operation is easy, and power consumption is low.

The wastewater flowing into the anaerobic tank 21 is agitated by the action of the anaerobic tank stirrer 21-2 in a complete anaerobic state without dissolved oxygen such as dissolved free oxygen or nitrate nitrogen, so that the wastewater and the return sludge are completely mixed. Since organic matter is supplied while being evenly contacted, phosphorus-removing microorganisms release organic phosphorus sufficiently while ingesting organic matter.

After passing through the anaerobic tank 21, the wastewater flows into the anaerobic tank through the anoxic tank inlet C and at the same time is nitrified from the aerobic tank 23 by the operation of the recirculation pump 27 installed in the aerobic and anaerobic tank connecting openings (e). Wastewater containing a large amount of nitrate nitrogen enters a large amount.

Denitrification bacteria because the abundant organic matter introduced from the anaerobic tank 21 and the recycled water containing a large amount of nitrate nitrogen and waste water are completely mixed evenly by the action of the anoxic tank agitator 22-1 installed in the anoxic tank 22. The action of vigorously takes place and consumes the combined oxygen in nitrate nitrogen, which is converted into nitrogen gas and released into the atmosphere to be removed.In this case, the organic matter in the wastewater is ingested at a ratio of 3 to 1 And in the absence of an alkali, the concentration of organic matter decreases and the pH rises.

The proportion of nitrate nitrogen removed in an anaerobic bath is given by

Nr = R / (R + 1) × 100

Where Nr: nitrate nitrogen removal rate (%)

R: Drainage ratio of recycled amount to inflow and wastewater (natural water)

For example, if the recycle rate is 6, the removal rate Nr of nitrate nitrogen is

Nr = R / (R + 1) × 100 = 6 / (6 + 1) × 100 = 85.7%.

At this time, assuming that total nitrogen of the wastewater is 35 mg / L and 100% nitrification has occurred, the total nitrogen remaining in the effluent is 35 × (100-85.7) /100=5.000 mg / L.

It can be seen from the above equation that the nitrogen removal rate is only affected by the recycle rate, and the higher the recycle rate, the higher the nitrogen removal rate.

The waste water, which is recycled from the aerobic tank 23 to the anoxic tank 22, only has to pass through the hole of the thin bulkhead of the aerobic and anoxic tank connecting opening (e) without piping, so if the size of the connecting opening (e) is properly determined, The pressure loss produced is very small and almost negligible, and simulation shows that the power required to circulate the recycled water is very small because a recirculation rate of 5 to 6 times is obtained for the inflow and wastewater even with a head of 0.1 to 0.3 m.

Therefore, a large recycle ratio can be obtained with a small power, and the nitrogen removal rate can be increased with a small power consumption.

After denitrification from the anaerobic tank 22, the wastewater flows into the aerobic tank 23 installed in a contiguous manner, and at the bottom of the aerobic tank 23, the front of the aerobic tank 23 is provided with more diffusers and less diffusers toward the rear. The oxygen in the air supplied from the blower dissolves in the lower and waste water and becomes aerobic, while maintaining the dissolved free oxygen concentration at 2 to 4 mg / L, while simultaneously floating the waste water and completely mixing the waste water into the lower and waste water. Aerobic microorganisms, nitrifying microorganisms and phosphorus-removing microorganisms are activated and activated actively by nitrosomonas and nitrobacter, which are nitrifying microorganisms.Ammonia nitrogen in wastewater is oxidized to nitrate nitrogen and the action of phosphorus-removing microorganisms Phosphorus contained in the wastewater is excessively ingested in the body of the phosphorus-removing microorganism 2 to 6 times as much as usual due to the excessive intake phenomenon. At the end of the aerobic tank, the concentration of phosphorus in the sewage and wastewater is very low, the concentration of nitrate nitrogen is maximum, and the concentration of organic matter is very low.

In addition, during nitrification, nitrifying microorganisms consume a lot of alkalinity, so the pH is lowered at the end of the aerobic tank.

Since the diffuser device 24 has more diffusers in the front and less in the rear, more air is supplied to the front with higher oxygen demand and less diffuser at the rear with less oxygen demand, resulting in less air supply. In the front, the dissolved free oxygen concentration is increased to 2 to 4 mg / L to facilitate nitrification and excess intake of phosphorus, and at the end of the aerobic tank, the dissolved free oxygen concentration is adjusted to 0.3 to 0.5 mg / L to recycle water. The dissolved free oxygen does not inhibit the denitrification in the oxygen-free tank 22.

Recirculated water is transferred to the anaerobic tank 22 through an aerobic tank extension a) at the end of the aerobic tank 23.

The wastewater introduced into the final settling basin (30) from the aerobic tank (23), the solids (sludge) is sedimented to the bottom by gravity and collected in the sludge hopper 31, the sludge is transported in the sludge drawing pipe (32) The conveying sludge which is conveyed to the conveying sludge pump 34 and pumped by the conveying sludge pump 34 is conveyed to the preliminary denitrification tank 16 through the conveying sludge discharge pipe 35 through 33).

The supernatant generated in the final sedimentation basin 30 is collected in the supernatant water collecting device 36, and the coliform group is removed from the disinfection tank 40 through the supernatant discharge pipe 37, and then discharged into the stream as a discharge water through the discharge flow meter 42. .

In the above description, the general known techniques related to the wastewater treatment method and apparatus are omitted, but those skilled in the art will naturally be able to infer and deduce them.

In the following description of the present invention, the wastewater treatment apparatus has a specific shape and structure with reference to the accompanying drawings. However, the present invention can be variously modified and changed by those skilled in the art. It should be interpreted as falling within the scope of protection.

In addition, the installation of a biofilm device or a biofilm medium, or a floating biofilm material in all of the anaerobic tank, anoxic tank, and aerobic tank of the present invention or any process should be interpreted as falling within the protection scope of the present invention.

The present invention flows through the ratio distribution tank, and sends a portion of the waste water to the preliminary denitrification to remove the nitrate nitrogen in the return sludge, and transfer the internal circulating water from the anaerobic to the anaerobic tank by transferring to the anaerobic tank together with the remaining waste water. It is possible to achieve high phosphorus removal objectives by allowing sufficient phosphorus release to occur without.

In addition, the present invention is installed by connecting the anaerobic tank, anaerobic tank, aerobic tank, the anaerobic tank adjacent to the front of the final sedimentation basin, and the rear end of the aerobic tank is connected to the aerobic tank extension without connecting the start position of the anaerobic tank and formed in the connecting portion By installing a recirculation pump in the opening to transfer the waste water of the aerobic tank to the anaerobic tank, the head can be minimized and the large recirculation ratio can be obtained with less power, thereby achieving the purpose of increasing the nitrogen removal rate.

Furthermore, the present invention can achieve the object of reducing the power required for the transfer of the conveying sludge by minimizing the head of the loss due to the conveying sludge transport by installing the preliminary denitrification tank and the conveying sludge pump adjacently.

In addition, the present invention can achieve the object of simplifying the structure and easy operation by omitting the circulation pump and the connection pipe.

Claims (2)

Microbial reactor consisting of anaerobic tank, anaerobic tank, and aerobic tank divided into bulkheads; A final sedimentation basin connected to the rear end of the microbial reactor; A mixing tank in which a ratio distribution tank installed adjacent to the anaerobic tank and a preliminary denitrification tank in which an agitator is installed and an agitator are installed; An inflow channel connecting the mixing tank and the anaerobic tank; In the microbial reactor, the anaerobic tank located adjacent to the front of the final sedimentation basin and installed with a stirrer therein; An oxygen-free tank disposed in contact with the anaerobic tank, having an agitator installed therein, and a recirculating pump installed at an opening with the aerobic tank; An aerobic tank located in contiguous contact with the anoxic tank and having an air diffuser installed therein; An air pipe and a blower for supplying air to the air diffuser; A final sedimentation basin in contiguous connection with the aerobic tank; A pipe and conveying sludge pump for drawing sludge deposited in the sludge hopper in front of the final settling basin and transferring it to a preliminary denitrification tank; And And an advanced anaerobic tank and recirculation unit consisting of a disinfection tank connected to the final sedimentation basin. In sewage and wastewater treatment facilities that treat sewage highly Flowing in the ratio distribution tank, 5-25% of the wastewater is introduced into the preliminary denitrification tank, and 75-95% is introduced into the mixing tank; Stirring in the preliminary denitrification tank while remaining in an anaerobic state for 30 minutes to remove the nitrate nitrogen in the conveying sludge, then transferring to the mixing tank and mixing with the wastewater introduced into the anaerobic tank; Stirring in the anaerobic tank for 0.5 to 1.5 hours while releasing phosphorus sufficiently under the action of the phosphorus-removing microorganism; After passing through the anaerobic tank, the wastewater is introduced into the anaerobic tank; 1 to 2 hours in an oxygen-free tank while being transferred in an aerobic tank extension with a recirculation pump in an amount of 200 to 600%, and removing nitrate nitrogen while mixing with waste water and a stirrer; After passing through the anaerobic tank, the wastewater enters the aerobic tank; While staying in the aerobic tank for 2.5 to 4 hours, the air supplied from the blower is abandoned through the diffuser, and the front of the aerobic tank is supplied with a lot of air to increase the dissolved free oxygen concentration to 2 to 4 mg / L and to decrease the air toward the rear. At the end of the aerobic tank to lower the dissolved free oxygen concentration to 0.3 to 0.5 mg / L; After passing through the aeration tank, the wastewater flows into the final sedimentation basin and the sludge settles to collect in the sludge hopper, and the sludge collected in the sludge hopper flows through the return sludge pump and piping, and transfers 50-100% of the waste water to the preliminary denitrification tank. ; And The supernatant is an advanced anaerobic tank and recirculation unit which is collected in a supernatant water collecting system, sterilized in a disinfection tank, and discharged.

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