KR100985467B1 - Advanced treatment apparatus and method of intermittent-bubble running-treatment for waste water - Google Patents

Abstract

In the intermittent continuous treatment type sewage treatment system 2 of the present invention, a first air supply pipe 14 having a plurality of transverse direction diffusers 16 is installed at the bottom in a single tank bioreactor 4, The vertical bulkhead 6 is installed in the reactor 4 to be divided into first and second reservoir chambers 8 and 10, and the first reservoir chamber 8 is provided with a wastewater inlet 12. 2 The storage chamber 10 is configured by submerging the microbial conveying pipe 20 connected to the immersion type separation membrane 24, the excess sludge drawing portion 26 and the wastewater inflow portion 12 of the first storage chamber (8). However, the intermittent aeration from the diffuser 16 causes the first reservoir 8 to be anaerobic and the second reservoir 10 is anaerobic and aerobic depending on whether or not the diffuser 16 is abandoned. The wastewater (W) introduced into the first storage chamber (8) through the wastewater inflow portion (12) flows into the second storage chamber (10) through the vertical partition wall (6) and the immersion type separation membrane (24). Via By continuously discharging to the final treatment water and the microorganisms accumulated downstream through the microbial transport pipe 20 can be returned to the wastewater inflow unit 12, the wastewater can be treated continuously and the device is simple to operate and maintain. It is intended to be easy to manage.

Wastewater, Single Reactor, Continuous Treatment, Intermittent Aeration, Immersion Separation Membrane, Microbial Transfer Pipe

Description

Intermittent Aeration Continuous Treatment Wastewater Advanced Treatment Apparatus and Method {ADVANCED TREATMENT APPARATUS AND METHOD OF INTERMITTENT-BUBBLE RUNNING-TREATMENT FOR WASTE WATER}

The present invention relates to an advanced wastewater treatment apparatus and method, and more particularly, to an intermittent aeration continuous treatment wastewater advanced treatment apparatus and method for continuously treating contaminants such as nitrogen and phosphorus contained in wastewater.

The high processing the wastewater biologically as the main method for removing organic matter and nitrogen and a is the wastewater anaerobic zone, which process by transporting the reactor the sludge was passed through the reactor, such as oxygen-free zone, aerobic zone AO, SBR, A ₂ There are a number of continuous processes such as O process, UCT process, VIP process, and batch type by intermittent aeration.

 Among them, the intermittent aeration continuous treatment sewage treatment advanced treatment method based on AO, A2O, etc. is a large and complex facility, or it is complicated to maintain mechanical facilities such as stirrer and return pump sedimentation basin and electrical and instrumentation facilities. It is difficult and expensive to operate.

 In the case of SBR (Batch Treatment Facility), continuous treatment is difficult, and when the sludge (MLSS) concentration is increased, the sludge limit surface is increased during the sedimentation process, and it is difficult to separate solid-liquid, and when the SRT is increased, Due to the increase in FLOC, the quality of treated water is worsened and there is a limit to advanced treatment.

In addition, biological wastewater advanced treatment method using floating media, wastewater elevation processing method using fully immersed rotating media and intermittent aeration, wastewater advanced treatment technology using pump ejector and bio green media, anaerobic / intermittent aeration / culture tank Advanced wastewater treatment technology, advanced wastewater treatment technology by sludge reaeration, advanced wastewater treatment technology using anaerobic / anaerobic / aerobic / gas stripping and submerged hollow fiber membranes.

However, the advanced wastewater treatment technologies are difficult to continuously process and require a return sludge pump and piping facility, and a sedimentation basin and its return pump and piping facility. There are disadvantages such as high cost.

Accordingly, an object of the present invention, intermittent aeration continuous treatment type sewage water that can be installed and maintained at a low cost and easily operated to easily and stably treat pollutants such as organic substances and nitrogen, phosphorus, etc. A processing apparatus and method are provided.

Another object of the present invention, the intermittent aeration continuous treatment type so that the microorganisms accumulated downstream of the bioreactor can be reused so that the treatment efficiency (throughput and removal rate of contaminants) of the wastewater is very high compared to the same volume of the single reactor bioreactor. Provided is an advanced wastewater treatment apparatus and method.

In order to achieve the above object, the intermittent continuous treatment type sewage treatment apparatus 2 of the present invention, in the sewage treatment apparatus 2, has a plurality of horizontal apparatuses in the transverse direction at the bottom in a single tank of the bioreactor 4. The first air supply pipe (14) having the (16) is installed, the vertical partition 6 is installed in the bioreactor 4, divided into first and second reservoir chambers (8) (10), and the first configuration The wastewater inlet 12 is installed in the reservoir 8, and the wastewater inlet of the submerged separator 24, the surplus sludge drawing 26, and the first reservoir 8 is installed in the second reservoir 10. 12) is constructed by submerging the microbial conveying pipe (20) communicated, the intermittent abandonment from the diffuser 16 to the first reservoir (8) is anaerobic and the second reservoir (10) ) Leads to anoxic and aerobic states according to the aeration of the diffuser 16, and the wastewater (W) introduced into the first reservoir 8 through the wastewater inlet 12 is a vertical bulkhead (6). The microorganisms introduced into the second reservoir 10 and continuously discharged to the final treatment water through the immersion type separation membrane 24 and accumulated downstream through the microbial transport pipe 20 are returned to the wastewater inlet 12. It is characterized by the configuration so that it can be.

In order to achieve the above object, the intermittent continuous treatment type wastewater advanced treatment method according to the present invention is a wastewater advanced treatment method. It is divided into reservoirs (8) and (10), and intermittently giving up intermittently at a predetermined cycle within 20-30 minutes and aeration time 10-15 minutes through the acid devices 16 at the bottom of the bioreactor 4 The chamber 8 is anaerobic, the second reservoir 10 is in aerobic and anoxic states according to the aeration of the diffuser 16, and the wastewater W is the wastewater inlet 12. Through the anaerobic first reservoir (8), the microorganisms in the wastewater discharge the phosphorus, and the wastewater (W) containing the microorganisms that discharged the phosphorus is discharged through a plurality of outlets (6a) of the vertical bulkhead (6). 2 Induced denitrification by microorganisms in the anaerobic state, which flows into the reservoir 10 In the aerobic state, which is abandonment time, the nitrification and phosphorus-derived microorganisms cause excessive absorption of phosphorus and then continuously discharged to the final treatment water through the immersion type membrane 24 and accumulated downstream through the microbial transport tube 20. It is characterized in that the microorganisms can be returned to the wastewater inflow portion (12).

The present invention enables the continuous treatment of wastewater without sludge conveyance in a single reactor, does not require sedimentation basins, conveying pumps and plumbing equipment, and accordingly the electrical equipment and instrumentation equipment is simple to maintain and reduce maintenance costs. It is possible to secure a high concentration of microorganisms (mixed liquor suspension), that is, MLSS (mixed liquor suspended solids: 10,000 mg / l) in the bioreactor, and to accumulate microorganisms accumulated downstream of the bioreactor for treatment of wastewater. It can be used to increase the efficiency of wastewater treatment compared to the same volume.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the formula and accompanying drawings.

1 is a block diagram of the advanced wastewater treatment system of the present invention, Figure 2 is a wastewater treatment state diagram of FIG. And, Figure 3 is a perspective view of the wastewater inflow portion of the present invention, Figure 4 is a perspective view of the vertical bulkhead of the present invention.

The present invention by applying the immersion type membrane (24) in the recent trend to increase the wastewater high-level treatment to ensure high concentration of microorganisms in the bioreactor (4) of a single tank and to treat the sewage water continuously by applying the advantages of batch and continuous It is easy to operate and maintain due to the simple device.

The bioreactor 4 of the present invention divides a single reactor into a first reservoir chamber 8 and a second reservoir chamber 10 by a vertical bulkhead 6, and the first reservoir chamber 8 and the second reservoir chamber. The first air supply pipe 14 and the second air supply pipe 15 each having a plurality of diffusers 16 at the bottom of the 10 are intermittently intermittently disposed so that the first reservoir 8 is anaerobic. And the second reservoir 10 is to be in an anaerobic state and aerobic state depending on the abandonment.

In the anaerobic first reservoir chamber 8, microorganisms in the wastewater (W) discharge phosphorus, and the second reservoir chamber 10 is deoxygenated at the time of no aeration, thereby denitrification by the microorganisms. Induction and aeration time to aerobic state nitrification and phosphorus-derived microorganisms to ingest excess phosphorus so that the removal of nitrogen and phosphorus in the waste water (W).

Most of the nitrogen in the influent wastewater (W) is in the form of organic nitrogen and ammonia nitrogen. Organic nitrogen is mostly converted to ammonia nitrogen through hydrolysis. Ammonia nitrogen is used as an energy source for autotrophic microorganisms when the second reservoir 10 is aerobic and is nitridated as follows.

^{_{2NH 4 + + 3O 2 → 2NO}} 2 - + 4H + + 2H 2 O + New Cells

^{_{2NO 2 - + O 2 → 2NO}} 3 - + New Cells

In summary,

^{_{NH 4 + + 1.83O 2 + 1.98HCO}} 3 - → 0.98NO 3 - + 0.021C 2 H 7 NO 2 + 1.88H 2 CO 3 + 1.04H 2 O

When the second reservoir 10 is anoxic, the nitrate produced by the nitrification reaction in the aerobic state is reduced to N ₂ O, NO, etc. through nitrate breathing and nitrite breathing of denitrifying bacteria in anoxic state. The released denitrification reaction takes place. Electron receptors are involved in this reaction, and an organic carbon source is used as the main electron acceptor.

^{_{6NO 3 - + 5CH 3 OH →}} 3N 2 + 5CO 2 + 7H 2 O + 6OH -

_{^{2NO 2 - + 6H + → N}} 2 + 2H 2 O + 2OH -

_{^{2NO 3 - + 10H + → N}} 2 + 4H 2 O + 2OH -

Given the synthesis of cells here,

^{_{NO 3 - + 1.08CH 3 OH +}} 0.24H 2 CO 3 → 0.06C 5 H 7 NO 2 + 0.47N 2 + 1.68H 2 O + HCO 3 -

Next, the removal of phosphorus uses the luxury uptake phenomenon in which phosphorus is released in anaerobic state and excess phosphorus is ingested in aerobic state.

In the first anaerobic reservoir, the random microorganisms produce acetate and other products by feeding SCVFA (Short Chain Volatile Fatty Acid), which is easily degraded by microorganisms.

Phosphorus-removing microorganisms move them into cells, converting Acetyle-CoA into acetate and converting it into PHB (Poly Hydroxyl Butyrate), where phosphorus is released as a bulk solution. The energy used is supplied by the decomposition of Poly-P.

When the second reservoir 10 is aerobic, PHB is oxidized to acetyle-CoA and used as an energy source for the growth of microorganisms, and ingests bulk phosphorus in bulk during the TCA cycle. Microorganisms that consumed excessive phosphorus are discharged to excess sludge to remove phosphorus.

 As described above, the wastewater (W) from which organic matter, nitrogen, phosphorus, etc. are removed through the first and second reservoir chambers 8 and 10 is separated through solid-liquid separation membrane 24 of the second reservoir chamber 10. Discharged into the final treatment water.

Now, with reference to Figures 1 to 4 will be described the intermittent aeration continuous treatment sewage wastewater treatment apparatus of the present invention performing the above reaction.

In the intermittent aeration continuous treatment type sewage treatment system 2 of the present invention, a vertical partition 6 is installed in a single tank bioreactor 4 and partitioned into first and second reservoir chambers 8 and 10, The first reservoir 8 is provided with a wastewater inlet 12, and the second reservoir 10 is provided with an immersion type membrane 24, a microbial transport tube 20, and an excess sludge drawing unit 26. The second air supply pipe 15 is installed at the bottom of the first reservoir chamber 8, and the first air supply pipe 14 is installed at the bottom of the second reservoir chamber.

The wastewater (W) is continuously introduced into the first storage chamber (8) through the wastewater inflow portion (12) and flows into the second storage chamber (10) through the vertical bulkhead (6), and the second storage chamber (10) Through the immersion type membrane 24 to be continuously discharged to the final treatment water, the microorganisms accumulated downstream of the second reservoir 10 is conveyed back to the wastewater inlet 12 by the microbial transport pipe (20).

The vertical bulkhead 6 installed in the bioreactor 4 is installed at an upstream point in the bioreactor 4, and the bioreactor 4 is formed by the first reservoir 8 and the first storage chamber 8 by the vertical bulkhead 6. It is divided into 2 water storage chambers 10. The vertical bulkhead 6 is formed from the upper side to the bottom bottom in the bioreactor 4, and a plurality of outlets 6a are formed below the vertical bulkhead 6 so that the wastewater W of the first reservoir 8 is The plurality of outlets 6a of the vertical bulkhead 6 are introduced into the second storage chamber 10. By the above configuration, the wastewater W may be sufficiently retained in the first storage chamber 8 to sufficiently flow out the microorganisms in the wastewater, and then may flow into the second storage chamber 10.

A first air supply pipe 14 having a plurality of transverse direction diffusers 16 is installed at the bottom of the second water storage chamber 10 so as to be in an oxygen-free state and an aerobic state depending on whether or not abandonment occurs, and the first air supply pipe 14 The second air supply pipe 15 branching from the bottom is installed at the bottom of the first storage chamber 8 and intermittently aerated so that the first storage chamber 8 is generally anaerobic.
The first air supply pipe 14 and the second air supply pipe 15 are respectively provided with an on-off valve and configured to adjust the amount of air supplied from the air pump 18 according to the opening and closing operation of the on-off valve.
The diffuser 16 of the first air supply pipe 14 is intermittent intermittent aeration at a predetermined cycle within 20 to 30 minutes of aeration time, 10 to 15 minutes of aeration time, the aeration and aeration time is the concentration and installation of the influent The amount of air injected per hour for each type of air supply pipe and diffuser can be adjusted in the above range. The diffusers 16 of the first air supply pipe 14 are connected to the dissolved oxygen measuring device DO to control the oxygen concentration of the second storage chamber 10 by driving by an inverter control method so that the influent wastewater W Air supply amount for the concentration of the) and the acid efficiency of the diffuser (16) can be controlled.

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The first reservoir 8, which is separated from the second reservoir 10 by the vertical bulkhead 6, is formed at an upstream point in the bioreactor 4, and the wastewater inlet 12 and the bottom are disposed on the side wall. The mechanisms 17 are installed. The first reservoir 8 is formed in a narrower space than the second reservoir 10, and is separated into the independent reservoir 10 by the vertical partition 6.

In addition, although the diffusers 17 are installed on the bottom of the first reservoir 8, the number of diffusers 16 installed on the bottom of the second reservoir 10 is smaller than that of the second reservoir 10. More intermittently intermittent abandonment, the waste water (W) introduced by the wastewater inflow portion 12 has a large amount of DO consumption regardless of the aeration of the living machinery (17) is generally maintained in the anaerobic state.

The acid devices 17 installed on the bottom of the first reservoir 8 are converted into volatile fatty acids (VFA-Volatile Fatty Acid) in the wastewater (W) by anaerobic fermentation bacteria in the anaerobic state. The lower part is to prevent the phenomenon of corruption.

The wastewater inflow portion 12 installed on the side wall of the first storage chamber 8 is a rectangle having a length that can be lowered to 2/3 of the total water level h from the upper side wall of the first storage chamber 8. Can be formed. In addition, the bottom 12 of the wastewater inlet 12 is formed evenly so that the wastewater W can be evenly distributed to the first reservoir 8 through the wastewater inlet 12. The pore 12a may be evenly formed on the bottom of the remaining three sides except for one side coupled to the bottom surface of the wastewater inflow portion 12 and the side wall of the first water storage chamber 8. In the present invention, the porous 12a may be formed in a size of about 50 mm, and six holes may be formed on the bottom surface of the wastewater inflow portion 12 and three on each of the three sides. The wastewater inflow portion 12 formed as described above naturally disperses into the entire lower portion of the first storage chamber 8 when the wastewater W is introduced to prevent the phenomenon from being pulled to one side.

The wastewater (W) introduced through the wastewater inflow portion 12 is sufficiently retained in the anaerobic first reservoir chamber 8 so that the microorganisms release phosphorus, and formed in the lower portion of the vertical partition 6 It flows into the 2nd water storage chamber 10 through the outlet 6a.

The second reservoir 10 is formed with a larger capacity than the first reservoir 8, and the submerged separator 24, the excess sludge drawing part 26, and the microbial conveyance are located at a downstream point of the second reservoir 10. The tube 20 is installed. The second reservoir 10 is in an anaerobic state and an aerobic state depending on the aeration from the diffuser 16, when the second reservoir 10 is anoxic, denitrification occurs and the second low When the water chamber 10 enters an aerobic state, excess phosphorus intake by microorganisms released from the nitrification and anaerobic first reservoir 8 is generated.

When the diffusers 16 of the first air supply pipe 14 are not aerated, the second reservoir 10 is formed in an oxygen-free state in which oxygen is formed to 0.5 mg / l or less, and microorganisms in the wastewater (w) These denitrification reactions are performed in which oxygen deficient in an oxygen-free state is released to the atmosphere in a nitrogen gas state by a reducing action in which oxygen in nitrate nitrogen is consumed.

When the diffusers 16 of the first air supply pipe 14 are not aerated, the second reservoir 10 is formed in an aerobic state to nitrify organic nitrogen and ammonia nitrogen, and oxidize and decompose organic pollutants. Bioreactor (4) Luxurious uptake is caused by the microorganisms that discharged phosphorus in the lower anaerobic state, which accumulates phosphorus in the microorganism and then removes it by discharge of excess sludge.

The wastewater (W) in which the contaminant is removed in the expiratory state is solid-liquid separated by an immersion type separation membrane (24) for separating the treated water into solid-liquid separation, and the excess sludge is discharged to the outside of the bioreactor (4) by the excess sludge drawing part (26). It is taken out.

The wastewater advanced treatment apparatus 2 of the present invention is maintained at a very high MLSS concentration of 10,000 to 12,000 mg / l by solid and liquid separation by the immersion type membrane 24, thereby reducing the amount of excess sludge generated by the microbial asset and anaerobic. Dissolved oxygen consumption by endogenous respiration of microorganisms in the state and anoxic state increases nitrogen removal efficiency even if the C / N ratio suitable for nitrogen removal is not satisfied.

The immersion type separation membrane 24 is a hydrophilic hollow fiber type immersion filtration membrane formed with a membrane pore size of about 0.2 to 0.4 μm and is installed at a depth of 30 to 50 cm below the surface of the water so as to be always immersed in water. It is connected to control the operation of the treated water discharge pump (28). In this case, the diffusers 16 of the first air supply pipe 14 installed at the bottom of the immersion type separation membrane 24 also serve to clean the immersion type separation membrane 24.

The immersion type separation membrane 24 controls the operation of the treated water discharge pump 28 through the water level meter L and the flow meter F to automatically adjust the amount of treated water and discharge the treated water through the outlet pipe 30 after filtration. In addition, it is possible to check the contamination state of the membrane from time to time by installing a differential pressure gauge to determine the contamination state of the immersion type separation membrane (24).

In addition, the immersion type separation membrane 24 is configured to have a pump and plumbing facility so that the excess sludge drawing part 26 is connected to the outside of the bioreactor 4 at all times. The excess sludge discharge pump draws high phosphorus sludge due to excess phosphorus intake to increase phosphorus removal efficiency, and the waste sludge is disposed of as a dewatered cake.

In addition, between the immersion type separation membrane 24 and the excess sludge drawing portion 26, the microbial conveying pipe 20 communicated with the wastewater inflow portion 12 of the first reservoir chamber 8 is installed to be submerged. The microbial conveying pipe 20 has a distal end located in the water near the bottom of the second reservoir 10, and the air branch pipe 22 branched from the first air supply pipe 14 is connected to the side. At the time of aeration, air flows from the air pump 18 into the air distributor 22 along the first air supply pipe 14, and again, air flows from the air distributor 22 into the microbial transport tube 20. . The microbial conveying pipe 20 conveys the microorganisms accumulated in the downstream of the second storage chamber 10 to the wastewater inflow unit 12 by the air inflow of the air distributor 22.

According to the configuration as described above, the advanced wastewater treatment system (2) and method of the present invention is a simple apparatus BOD concentration of 150mg / L, TN 60mg / l, TP 5mg / l sewage wastewater BOD 3mg / l, Continuous treatment with TN 5 mg, L and TP 1 mg / L showed very high treatment efficiency.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

1 is a block diagram of an advanced wastewater treatment system of the present invention;

2 is a wastewater treatment state diagram of FIG.

3 is a perspective view of the wastewater inflow portion of the present invention;

4 is a perspective view of the vertical bulkhead of the present invention.

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

2: advanced wastewater treatment system 4: bioreactor

6: vertical bulkhead 8: first reservoir

10: second reservoir chamber 12: hape water inlet

14,15: Air supply pipe 16,17: diffuser

20: microbial transport pipe 22: air branch pipe

24: dipping membrane 26: excess sludge drawing part

Claims (7)

In the wastewater advanced treatment apparatus, A vertical bulkhead 6 having a plurality of outlets 6a is installed in a single tank bioreactor 4 and divided into first and second reservoir chambers 8 and 10, and the first and second reservoir chambers ( 8) In the bottom of 10, first and second air supply pipes 14 and 15 having lateral majority diffusers 16 and 17 are respectively installed, and in the first reservoir chamber 8, the bottom and the bottom The wastewater inflow portion 12 is formed with a uniform pore 12a, and the second reservoir 10 has a sewage separation membrane 24, a surplus sludge drawing portion 26, and a wastewater inflow portion of the first reservoir chamber 8. The microbial conveying pipe 20 communicated with (12) is configured to be submerged, but the intermittent abandonment from the diffusers 17 causes the first reservoir chamber 8 to become anaerobic and the second reservoir chamber ( 10) leads to anoxic state and aerobic state according to the aeration of the diffuser (16), the wastewater (W) introduced into the first reservoir (8) through the wastewater inlet 12 is a vertical bulkhead (6) Inflow into the second reservoir 10 through the needle The microbial conveying pipe 20 connected to the air branch pipe 22 branched from the first air supply pipe 14 and continuously discharged to the final treated water via the mold separation membrane 24 is downstream of the second storage chamber 10. It is installed to be submerged, the air flows into the microbial conveying pipe 20 from the air distributor 22 at the aeration time of the second reservoir 10, the microorganisms accumulated downstream using the principle of the air lift pump inflow into the wastewater Intermittent aeration continuous treatment type sewage treatment apparatus, characterized in that configured to be returned to the unit (12). delete delete The method of claim 1, MLSS (mixed liquor suspended solids) concentration in the bioreactor (4) is characterized in that to maintain 10,000 ~ 12,000mg / ℓ. The method of claim 1, The diffuser 16 in the second reservoir 10 is configured to intermittently give up at a predetermined cycle within 20 to 30 minutes of aeration time and 10 to 15 minutes of no aeration time. In the advanced wastewater treatment method, The interior of the unitary bioreactor 4 is partitioned into first and second reservoirs 8 and 10 by a vertical bulkhead 6 and through the diffusers 17 at the bottom of the first reservoir 8. The intermittent aeration gives the first reservoir 8 an anaerobic state, and the second reservoir 10 intermittently abandons intermittently at regular intervals within 20-30 minutes of aeration time and 10-15 minutes of no aeration time. ) To become aerobic and anaerobic according to the abandonment status of the wastewater, and the wastewater (W) is introduced into the anaerobic first reservoir (8) through the pore (12a) of the wastewater inlet (12), and microorganisms in the wastewater The wastewater (W) containing the microorganisms from which phosphorus is discharged is introduced into the second reservoir chamber (10) through the plurality of outlets (6a) of the vertical bulkheads (6) to the microorganisms in the anaerobic state, which is aeration time. Induces denitrification, and in the aerobic state at the aeration time, nitrification and phosphorus-derived microorganisms cause excessive absorption of phosphorus. It is continuously discharged to the final treatment water through the immersion membrane 24, the air is introduced from the air branch pipe 22 branched from the first air supply pipe 14 at the aeration time of the second reservoir 10, the air lift pump By using the principle of the intermittent aeration continuous treatment type sewage water advanced treatment characterized in that the microorganisms accumulated downstream of the first reservoir (8) can be conveyed to the wastewater inlet 12 through the microbial transport pipe (20) Way. delete

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