KR100860300B1 - Apparatus and method for advanced wastewater treatment for intermittent aeration - Google Patents

Abstract

The present invention relates to an intermittent aeration continuous treatment type membrane combined type sewage treatment apparatus and method, and an air supply pipe (22a) having a plurality of acid devices (22) formed on the bottom of a single tank bioreactor (100) In the side wall of the bioreactor 100, three-stage bulkheads 10, 12 and 14 are installed so that the multi-stage reactors 101, 102 and 103 are provided, but the first-stage bulkhead 10 and the three-stage bulkhead ( 14) the lower part is opened and the second stage bulkhead 12 is configured so that the upper part is opened, and behind the third stage bulkhead 14, the immersion membrane tank with the air cleaning submerged separator 16 and the excess sludge drawing part connected to the outside ( 18), the wastewater that is continuously introduced into the reaction tank 1st stage 101 so that air is intermittently injected into the air injection diffuser 2 so that intermittent aeration is formed in the bioreactor 100, the second stage bulkhead 12 ) Reaction behind the third stage bulkhead 14 after passing through the second stage 102 of the reaction tank It is configured to be continuously discharged to the final treatment water through the immersion type separation membrane 16 of the tank 3 stage 103, so that the sewage can be treated continuously and the device is simple and easy to operate and maintain.

Description

Advanced wastewater treatment system and method of intermittent aeration continuous treatment membrane-bonded type

The present invention relates to an advanced treatment apparatus and method for wastewater (sewage and wastewater), and in particular, intermittent aeration continuous treatment membrane combination for continuously treating contaminants such as organic substances and nutrients (nitrogen, phosphorus) contained in the wastewater. It relates to a type advanced processing apparatus and method.

In general, the main treatment methods to remove nitrogen and phosphorus by advanced treatment of wastewater include sludge return while treating wastewater continuously like the A ₂ O method, or batch treatment by intermittent aeration like the SBR method.

Biological denitrification and dephosphorization processes include A ₂ O process, UCT process, VIP process, MUCT process, etc. The following methods (1 ~ 25) have already been proposed in Korea, and there are many others.

1. Advanced sewage treatment technology using anaerobic / intermittent aeration / culture tanks (HBR-Ⅱ). 2. Advanced sewage treatment technology by sludge reaeration (DASPro). 3. Advanced sewage treatment technology (HANT) using anoxic / anaerobic / aerobic / gas stripping and submerged hollow fiber membranes. 4. Advanced sewage treatment technology (SENS) that combines mid-temperature release of sewage sludge with post-denitrification. 5. Swirl Vortex SBR Method. 6. Advanced sewage treatment technology using lifting curtain wall SBR method (PSBR). 7. Treatment of nitrogen and phosphorus in sewage by B3 method. 8. Advanced sewage treatment technology using submerged flat membrane and electrolytic dephosphorization (K-MBR method). 9. Advanced sewage treatment technology using Bio-Reactor (HBR-Ⅲ). 10. Advanced sewage treatment technology using SBR reactor and spontaneous flotation system. 11. Advanced Sewage Treatment Technology by Oxidation Process (PhICD). 12. Advanced sewage treatment technology (BBF-DNS) using biofilters and sulfur-limestone. 13. Advanced livestock wastewater treatment technology using rotary microbial contact tank and bioreaction tank. 14. MS-BNR Process using multi-stage inflow and fixed bed carrier. 15. Advanced sewage treatment using Bio-Ceramic Filtration. 16. SBR sewage treatment (TSBR) technology with full oxygen tank, anaerobic tank and sedimentation zone. 17. Advanced sewage treatment technology using anaerobic tank, intermittent aeration circular oxidizer and circulation reactor (SAMCO process). 18. Advanced sewage treatment technology using an anaerobic tank basin process divided into porous bulkheads. 19. Advanced sewage treatment using CN-BIOCONTACT carrier. 20. Advanced sewage treatment using pump eject and BioGreen Media. 21. Advanced sewage treatment using packaged DNR process. 22. AOSB Process using anoxic respirators and sludge blankets. 23. SMMIAR Process using fully submerged rotating media and intermittent aeration. 24. Removal technology, biological nitrogen, using expanded poly-propylene (FPP) flotation media. 25. Nitrogen and phosphorus removal processes in sewage using an upflow bioreactor (UMBR) (KNR system).

However, the above advanced wastewater treatment technologies have a limited amount of treatment due to difficulty in continuous treatment, and require a sludge pump and piping facility, and a sedimentation basin and its conveying pump and piping facility. It was difficult to manage and costly to maintain.

Accordingly, an object of the present invention is the intermittent aeration continuous membrane-mapped type that can be installed and maintained at low cost and easily operated to easily and stably treat contaminants such as organic substances and nutrients in sewage water. Provided is an advanced wastewater treatment apparatus and method.

It is another object of the present invention to provide an intermittent aeration continuous treatment membrane-bound sewage water treatment apparatus and method which has a very high treatment efficiency (throughput and pollutant removal rate) of sewage water compared to the same volume of a bioreactor in a single reactor. have.

According to the present invention, in the wastewater advanced treatment apparatus of a single reaction tank, an air supply pipe 22a in which a plurality of acid devices 22 are formed is installed at the bottom of the single reactor bioreactor 100, and the side wall of the bioreactor 100 The third stage bulkheads 10, 12, and 14 are installed so that the multi-stage reactors 101, 102 and 103 are provided, but the first stage bulkhead 10 and the third stage bulkhead 14 are partially opened at the bottom. The second stage bulkhead 12 is configured to open a part of the upper part, and the third stage bulkhead 14 constitutes an immersion membrane tank in which an air cleaning immersion type separation membrane 16 is installed and an excess sludge drawing unit 18 connected to the outside, and a bioreactor Intermittent air is intermittently injected into the air injection diffuser 2 so that intermittent aeration is formed in the 100, and the second stage of the reaction tank 2 stage 102 before and after the wastewater flowing into the reactor 1 stage 101 is continuously After the step 3, the immersion type separation membrane 16 of the reaction stage 3 stage 103 behind the partition 14 is removed. Characterized in that it is configured to be discharged continuously to the final treated water.

In addition, according to the present invention, in the advanced method for treating wastewater, the wastewater is continuously introduced into the first stage 101 of the bioreactor 100 of high concentration rice to be mixed, and then passed through the open lower portion of the first partition bulkhead 10 to the reactor 2. After passing through the stage 102 and passing through the upper and lower portions of the second and third stage bulkheads 12 and 14, respectively, and passing through the reactor 3 stage 103 to continuously discharge the final treated water, Intermittent intermittent aeration at regular intervals within 10 to 20 minutes of aeration time and 10 to 30 minutes of no aeration time through the air disperser 22, and is cleaned with the air disperser 24 at the bottom of the immersion type separation membrane 16 of the reaction tank 3 stage 103. It is characterized in that the organic material, nitrogen and phosphorus are simultaneously removed by drawing the excess sludge to the outside in the aerobic state through the continuous injecting the air for the excess sludge drawing unit (18).

The present invention enables continuous treatment of wastewater without sludge conveying in a single reaction tank, and does not require a pump and piping facility for conveying sludge, and a sedimentation basin, conveying pump, and plumbing facility. Maintenance is easy and maintenance costs are also reduced. In addition, since it is possible to secure a high concentration of microorganisms in the bioreactor, there is an effect such as to significantly increase the wastewater treatment efficiency compared to the same volume.

In the present invention, the intermittent continuous treatment type membrane-type sewage treatment system and method of the sewage treatment system are applied to the multi-stage reaction tank (101) in the bioreactor (100) in a single tank by applying the immersion type membrane (16), which is recently increasing, to the sewage treatment. (102) (103) to ensure a high microbial amount and by intermittent aeration method is to enable the simultaneous removal of organic matter and nitrogen and phosphorus.

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

1 is a block diagram of an advanced wastewater treatment system according to an embodiment of the present invention.

In the advanced wastewater treatment system (A) of the present invention, three stages of bulkheads 10, 12 and 14 are installed on both inner surfaces of the bioreactor 100, but the first stage bulkhead 10 is a bioreactor 100. The lower stage is opened by 5 to 15% of the total water level (h0) in the inside, and the second stage bulkhead 12 is opened so that the top is opened by 5 to 15% of the total water level (h0) in the bioreactor 100. The three-stage partition 14 is configured such that the lower end is opened by 40 to 60% of the total water level h0 in the bioreactor 100. At this time, if the opening degree of each partition 10, 12, 14 ends out of the above level, the treatment speed of the wastewater may be delayed or untreated wastewater may be discharged to reduce the treatment efficiency.

Then, behind the three-stage partition wall 14, the air cleaning immersion type separation membrane 16 having a membrane pore size of about 0.4 to 0.6 µm is installed at a height not to be exposed on the surface of the water and the outlet pipe 28 is connected. In addition, the immersion type separation membrane 16 is configured to have an excess sludge drawing part 18 connected to the outside of the bioreactor 100 to have a pump and piping equipment so that the excess sludge can always be drawn in an exhaled state.

The whole of the bottom of the bioreactor 100 is provided with a single air supply pipe (22a) formed evenly arranged a plurality of air diffuser 22, the blower is a controller (not shown in the figure) for controlling the air injection into the air diffuser 22 It is configured to connect with (not shown in the drawing). The upper part of the water in the bioreactor 100 is installed in conjunction with the membrane filtration pump of the immersion type membrane 16 to install a water gauge 20 for controlling the inflow of sewage and the outflow of the treated water.

In particular, the advanced wastewater treatment system (A) of the present invention, the wastewater introduced into the reaction tank 1 stage 101 in front of the first stage partition 10 in the bioreactor 100 through the inlet pipe 26 is completely mixed After that, it is configured to stay for a certain time. Thereafter, the wastewater is continuously connected to the second stage 102 of the reaction tank between the first stage partition wall 12 and the third stage partition wall 14 and the third stage 103 of the reaction tank between the third stage partition wall 14 and the submerged membrane 16. By configuring the inflow, it is possible to prevent the discharge of short-circuit flow, that is, untreated sewage water from the reactor 1 stage 101 complete mixing tank.

In addition, the amount of microorganisms (mixed liquor suspended matter) in the bioreactor 100, that is, the concentration of mixed liquor suspended solids (MLSS) is maintained at 10,000 to 20,000 mg / l, so that the air is supplied to the acid diffuser 22 at the bottom of the bioreactor 100. The sludge layer interface height h1 is maintained at 70% or more of the total water level h0 even when oxygen is not supplied. Contaminants in the influent sewage are 98.7% for BOD (Biochemical Oxygen Demand), 91.7% for TN (total nitrogen), and 80% for TP (total phosphorus). It is configured to increase the processing efficiency by controlling the intermittent aeration time appropriately in consideration of the degree and quantity.

Now, a method of treating wastewater by using the present invention intermittent aeration continuous treatment type membrane-type sewage wastewater treatment apparatus (A) configured as described above will be described.

2A is a state diagram of wastewater treatment in an aerobic condition of FIG. 1, and FIG. 2B is a state diagram of wastewater treatment in an anaerobic anaerobic condition of FIG.

The wastewater introduced into the reactor 1 stage 101 complete mixing tank of the bioreactor 100 is completely mixed with a high concentration trapping type sludge layer containing microorganisms and after a certain period of time, the reactor 2 stage 102 and the reactor 3 stage ( 103) It is sequentially introduced into the immersion membrane tank.

Here, when the air is injected through the single acid unit 22 at the bottom of the bioreactor 100, an aerobic condition is formed. In this case, as shown in FIG. 2A, organic matter in the influent wastewater is removed and nitrification of ammonia nitrogen. This occurs and the absorption of soluble phosphorous by the accumulation of microorganisms is achieved.

On the other hand, if air is not injected into the bioreactor, as shown in FIG. 2B, the sludge decay is slowly achieved and the organic matter in the sewage is biosorbed and remains by the microorganisms when the influent sewage passes between the sludge layers. It depletes oxygen, and denitrification is carried out using bound oxygen in nitrate nitrogen. In addition, when the combined oxygen is depleted in the first stage 101 and the second stage 102 of the reactor, anaerobic conditions are formed, so that phosphorus release of the accumulating microorganisms occurs, thereby increasing the soluble phosphorus concentration in water.

In the three stage 103 immersion membrane tank, the treated water is automatically adjusted through the water gauge 20 and the membrane filtration pump, and the treated water is filtered out through the immersion separator 16. In other words, the mixed liquor suspended solid (MLSS) is applied during the end of the aeration time from about 3 to 5 minutes after the aeration time of the bioreactor 100, that is, while the sludge sinks below the height of the second stage bulkhead 12. Since only the wastewater of the upstream which does not contain is passed through the two-stage partition 12, it is introduced into the immersion membrane tank of the reaction stage 3 stage 103, so that the MLSS concentration phenomenon is prevented from the immersion membrane 16, so that the membrane filtration is made smoothly. .

At this time, the air for scrubbing of the submerged membrane 16 is continuously injected through the air supply pipe 24a and the diffuser 24. Therefore, the concentration of dissolved oxygen (DO) in the middle and top of the reactor 3 stage 103 is always maintained above a certain concentration, so that the aerobic conditions are also maintained, the decomposition of organic matter by aerobic microorganisms and the absorption by the accumulation of microorganisms The organic matter concentration and phosphorus concentration in the treated water can be lowered.

In addition, since the MLSS concentration of the bioreactor 100 is a high concentration of 10,000-20,000 mg / l, the physical contact between the precipitate particles may be achieved even in anoxic conditions in which air is not supplied to the acid devices 22 at the bottom of the bioreactor 100. The greater the blockage, the longer the settling time and the more compact the settling form, which forms a distinct solid-liquid boundary, that is, the interface height h1 of the sludge layer can be maintained at about 70-95% of the total water level h0.

Therefore, it is possible to reduce the amount of excess sludge by inducing the microbial asset and to increase the nitrogen removal efficiency even if the C / N ratio suitable for nitrogen removal is not satisfied because the dissolved oxygen consumption by the endogenous respiration of the microorganism under anaerobic anoxic conditions.

In addition, the excess sludge drawing unit 18 is installed at the middle of the immersion membrane tank so as to be connected to the outside of the bioreactor 100 so that the excess sludge in the sludge can be maintained at a high expiration state, thereby maintaining a high content. Phosphorus removal efficiency of water is also greatly improved. At this time, the drawn excess sludge is dehydrated through a dehydration apparatus so that the dewatered sludge is disposed of and the dewatered filtrate is re-introduced into the reactor 1 stage 101 to be reprocessed.

Particularly, in the present invention, the bioreactor 100 performs intermittent intermittent aeration at a constant cycle within 10 to 20 minutes for aeration time and 10 to 30 minutes for aeration time. The amount of air injected per hour for each type of the 22a and the diffuser 22 can be adjusted in the above range.

For example, as shown in Figure 1, when the BOD concentration of the influent sewage water 150mg / L, TN 60mg / L, TP 5mg / L or so, it is most preferable to intermittently give up a 15 minutes aeration time, 25 minutes aeration time, Effluent treatment water passed through the bioreactor 100 of the present invention exhibits a very high treatment efficiency, such as BOD 2mg / l, TN 5mg, l, TP 1mg / l. Therefore, according to the present invention intermittent aeration continuous treatment type membrane-type sewage treatment system (A) and method, contaminants in the sewage water were removed to 98.7% BOD, 91.7% TN, and 80% TP. The treated water can be obtained continuously.

The present invention is expected to be widely used in a large amount of wastewater treatment apparatus because the wastewater can be treated quickly, easily and efficiently at low cost.

1 is a block diagram of an advanced wastewater treatment system according to an embodiment of the present invention.

Figure 2a is a wastewater treatment state diagram in the aerobic conditions of Figure 1;

Figure 2b is a state of wastewater treatment in anaerobic anaerobic conditions of Figure 1;

<Explanation of symbols for the main parts of the drawings>

(A)-Advanced wastewater treatment system (10)-Stage 1 bulkhead

(12)-Tier 2 bulkheads (14)-Tier 3 bulkheads

(16)-Immersion type separation membrane (18)-Excess sludge drawing part

(20)-water gauge (22) (24)-diffuser

(26)-inlet pipe (28)-outlet pipe

(100)-Bioreactor (101)-Reactor 1st stage

(102)-two stages of reactor (103)-three stages of reactor

Claims (5)

delete In the wastewater advanced treatment apparatus of a single reactor, On the bottom of the unitary bioreactor 100, air supply pipes 22a in which a plurality of acid devices 22 are formed are installed, and three-stage partitions 10, 12 and 14 are installed on the side walls of the bioreactor 100. Multi-stage reactors 101, 102, 103 are provided, but the bottom of the first stage bulkhead 10 and the top of the second stage bulkhead 12 are 5 to 15 of the total water level (h0) in the bioreactor 100. Opening by% and the bottom of the three-stage partition 14 is configured to open by 40 to 60% of the total water level (h0) in the bioreactor 100, behind the three-stage partition 14, air-immersed separation membrane (16). ) Is configured with an immersion membrane tank and the excess sludge drawing unit 18 connected to the outside, and intermittently the air is injected into the air injection diffuser (2) so that intermittent aeration is made in the bioreactor 100 The sewage flowing in continuously into the 101 passes through the second stage 102 of the reaction tank before and after the second stage bulkhead 12, and then after the third stage bulkhead 14. An intermittent aeration continuous treatment type membrane-type sewage treatment system for wastewater, which is configured to be continuously discharged to the final treated water through the immersion type separation membrane (16) of the reactor three stage (103). The method of claim 2, The concentration of mixed liquor suspended solids (MLSS) in the bioreactor 100 is maintained at 10,000-20,000 mg / l so that the sludge layer interface height h1 is 70-95% of the total water level h0 under anoxic conditions. Characterized in that the wastewater sewage treatment system of the intermittent aeration continuous treatment type membrane combined type. delete delete

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