KR100574672B1 - the treatment unit of sewage and wastewater using membrane bio reactor - Google Patents

Abstract

The present invention relates to a wastewater treatment apparatus using a membrane separation process, a stirring tank for agitating the introduced wastewater, aeration tank for culturing and agglomeration of aerobic microorganisms through the inflow of oxygen by the aeration device, the agitated wastewater, By constructing a wastewater treatment device consisting of a filtration tank for filtering the wastewater passed through the stirring tank and the aeration tank with a hollow fiber membrane module, through this process to treat wastewater, such as domestic wastewater, toilet and livestock wastewater, factory wastewater, and the hollow fiber membrane module to backwash It is easy to manage.

According to the present invention, the stirring tank 10, the aeration tank 20, and the filtration tank 30 are composed of a main body 40 sequentially configured and a peripheral device for operating the bar. A plurality of impellers 12 are fixed to the fixed shaft 11, and the aeration tank 20 is provided with an aeration device 21 for generating air at a lower portion thereof, and the stirring tank 10 and the aeration tank ( 20 forms a penetrating flow hole 41, and the filtration tank 30 forms the aeration tank 20 and a flow portion 42 having an upper portion thereof, and the upper and lower portions of the filtration tank 30 are opened. A cylindrical sieve 31 is provided, the upper portion of which constitutes a return line 43 connected to the stirring vessel 10 by a pipe, and the lower portion of the air support device 35 that generates air. In addition, the sieve 31 is provided with a hollow fiber membrane module 32 to form a filtration tank 30 to obtain a body portion 40 together with the stirring tank 10 and the aeration tank 20. The peripheral device includes a motor 51 rotating the shaft 11, a pump pump 53 for introducing waste water into the stirring tank 10, the aeration device 21 and the air flotation device 35. It consists of an air compressor (54) for supplying the suction / pressure pump (55) for moving the filtered water, and together with the main body portion 40 constitutes a wastewater treatment apparatus.

The wastewater treatment device configured as described above cultures semi-aerobic microorganisms by introducing the introduced wastewater into the stirring process of the agitation tank. In the subsequent aeration tank, the aerobic microorganisms in the water are rapidly cultured through the air supply and aeration device, and the nitrification is carried out by nitrification process through these. Nitrogen is generated, and the wastewater introduced into the sieve of the filtration tank is filtered through the hollow fiber membrane module. At this time, air bubbles are generated around the hollow fiber membrane module by the air flotation device, thereby minimizing the formation of a gel layer on the surface of the hollow fiber membrane. In the case of cleaning according to the gel layer formation, the hollow fiber membrane module is backwashed, and its management is easy.

And part of the waste water inside the trough is introduced into the stirring tank through the return line of the upper portion, the part of the aeration tank and the filtration tank again cultivation of semi-aerobic microorganisms and aerobic microorganisms, and some of the nitrate nitrogen Nitrogen is removed by degassing.

 Wastewater Treatment System, Toilet, Aeration, Sedimentation, Membrane, Separator, Filtration, Hollow Fiber Membrane

Description

Wastewater treatment system using membrane separation process {the treatment unit of sewage and wastewater using membrane bio reactor}

1 is a front view of the main body according to an embodiment of the present invention and a connection diagram of the peripheral device thereof.

2 is a front view of the main body according to an embodiment of the present invention.

3 is a side view of the main body according to the embodiment of the present invention.

4 is a cross-sectional view taken along line AA ′ of FIG. 3.

5 is a flow chart of a fluid in accordance with an embodiment of the present invention.

[Description of Code for Major Parts of Drawing]

10: stirring tank 20: aeration tank 30: filtration tank

40: main body 54: air compressor

The present invention relates to a wastewater treatment apparatus using a membrane separation process, a stirring tank for agitating the introduced wastewater, aeration tank for culturing and agglomeration of aerobic microorganisms through the inflow of oxygen by the aeration device, the agitated wastewater, By constructing a wastewater treatment device consisting of a filtration tank for filtering the wastewater passed through the stirring tank and the aeration tank with a hollow fiber membrane module, through this process to treat wastewater, such as domestic wastewater, toilet and livestock wastewater, factory wastewater, and the hollow fiber membrane module to backwash It is easy to manage.

Generally, there are various kinds of wastewater, such as domestic wastewater, wastewater from toilets, wastewater from livestock industry, and sewage from plant. These wastewaters are discharged to a purified state through wastewater treatment devices.

Existing wastewater treatment system is discharged or recycled by passing through the storage tank, aeration tank, sedimentation tank, filtration tank and turbidity tank sequentially, and the storage tank passes the sewage water generated through the settling basin or screen, and then the aeration tank is supplied from the storage tank. As air (oxygen) is blown into the waste water to form aeration, aerobic microorganisms cultivate organic matter in the waste water as nutrients and agglomerate, and these aggregates and other substances are precipitated in the next settling tank and accumulated at the bottom, and then filtered The filter is more finely filtered through the filter, and the filtered water flows into the turbid bath to remove odors and release the adsorbed water, or store it in a water tank for recycling.

Recently, membrane separation processes (MBRs, Membrane Bio-Reactor) are emerging to replace the filtration and turbid baths, which combines membrane technology with biological reaction tanks for wastewater treatment. It is a biological wastewater treatment process that completely separates activated sludge and treated water by applying a membrane to the reactor or the outside.

The microfiltration is a method of separating the residual suspended solids and microorganisms such as water, wastewater, sewage and the like by filling a filter of a cartridge (Cartridge Type Filter) formed of a porous fiber layer through a container of a predetermined size. It operates at a pressure of 0.1 to 2 kg / cm 2 with 0.1 to 10 μm, and mainly includes cartridge filter and bag filter. It is used for pretreatment of ultrafiltration.

In addition, the ultrafiltration is a method of separating a substance dissolved or dispersed in a liquid by particle size or molecular weight using an ultrafiltration membrane having a pore size of about 5 to 100 nm, and the membrane to be separated is a hollow fiber membrane. , Hollow fiber membrane, Ultra Filter), which is literally hollow in the middle, and its filtration capacity is such that low-molecular substances (H ₂ O, K, Mg, Ca, Na, Cl) in raw water pass through the membrane. The polymer materials (suspension (SS), Escherichia coli, virus, bacteria, bacterial vibrio, red algae, fats and oils, colloidal solution, pyrogen, etc.) are all concentrated and removed. The wider filtration efficiency is also excellent, but the self-supporting effect makes it possible to backwash, and even if the surface of the membrane is contaminated by backwashing, there is an advantage of easy performance recovery.

However, if the pretreatment of the waste water is not carried out to some extent, the formation of a gel layer on the membrane surface and the adhesion of the suspended solids are rapidly formed, resulting in the formation of a cake layer on the surface and a decrease in filtration performance. If the precision is too high, the installation and maintenance cost of the pretreatment device increases, and the treatment place increases, and if the backwashing process of the hollow fiber membrane is frequently performed, the burden on the washing water and the filtration time increase. There was a problem.

Therefore, the present invention, in order to solve the above problems, agitating tank for agitating the waste water introduced, aeration tank for culturing and agglomeration of aerobic microorganisms by the release of air (oxygen) through the aeration device to the wastewater introduced by stirring, the agitating tank and aeration tank And a wastewater treatment device composed of a filtration tank receiving the wastewater from the filtration tank and filtering the hollow fiber membrane module, and a peripheral device operating the body portion, and culturing the aerobic microorganisms in the stirring tank and culturing the aerobic microorganisms in the aeration tank. And denitrification to remove organic matter and nitrogen contained in wastewater, and to effectively treat wastewater, such as domestic wastewater, toilet and livestock wastewater, and plant wastewater, by microfiltration through hollow fiber membranes.

In addition, the main body portion is composed of three tanks or tanks continuously connected, the space of the compact body structure consisting of a stirring tank fixed impeller fixed to the rotating shaft, aeration tank formed aeration device, filtration tank formed hollow fiber membrane module And it is easy to bury, and the lower part of the hollow fiber membrane module is supplied with air from the air compressor, and constitutes an air flotation device to discharge the air evenly like the diffuser, the gel layer on the surface of the hollow fiber membrane through the air bubbles generated during filtration The purpose is to minimize the formation.

The upper part of the trough is formed with a return line connected to the agitator and pipe, and some waste water inside the trough is introduced into the agitator and circulated in the main body while degassing the nitrate nitrogen generated by the microorganism with nitrogen gas. Its purpose is to maximize nitrification and denitrification.

In addition, the hollow fiber membrane module of the filtration tank is filtered by the suction / pressure pump connected from the outside with suction force according to the discharge during filtration, and backwashing the hollow fiber membrane due to pressurization of the filtered water when removing the gel on the surface of the hollow fiber membrane. Another purpose is to make management easier.

The present invention relates to a wastewater treatment apparatus using a membrane separation process, a stirring tank for agitating the introduced wastewater, aeration tank for culturing and agglomeration of aerobic microorganisms through the inflow of oxygen by the aeration device, the agitated wastewater, By constructing a wastewater treatment device consisting of a filtration tank for filtering the wastewater passed through the stirring tank and the aeration tank with a hollow fiber membrane module, through this process to treat wastewater, such as domestic wastewater, toilet and livestock wastewater, factory wastewater, and the hollow fiber membrane module to backwash It is easy to manage.

According to the present invention, the stirring tank 10, the aeration tank 20, and the filtration tank 30 are composed of a main body 40 sequentially configured and a peripheral device for operating the bar. A plurality of impellers 12 are fixed to the fixed shaft 11, and the aeration tank 20 is provided with an aeration device 21 for generating air at a lower portion thereof, and the stirring tank 10 and the aeration tank ( 20 forms a penetrating flow hole 41, and the filtration tank 30 forms the aeration tank 20 and a flow portion 42 having an upper portion thereof, and the upper and lower portions of the filtration tank 30 are opened. A cylindrical sieve 31 is provided, the upper portion of which constitutes a return line 43 connected to the stirring vessel 10 by a pipe, and the lower portion of the air support device 35 that generates air. In addition, the sieve 31 is provided with a hollow fiber membrane module 32 to form a filtration tank 30 to obtain a body portion 40 together with the stirring tank 10 and the aeration tank 20. The peripheral device includes a motor 51 for rotating the shaft 11, a pump pump 53 for introducing waste water into the stirring tank 10, the aeration device 21 and the air flotation device 35. It consists of an air compressor (54) for supplying the suction / pressure pump (55) for moving the filtered water, and together with the main body portion 40 constitutes a wastewater treatment apparatus.

As described above, the present invention is mainly composed of the main body 40 and the peripheral device. First, the main body 40 will be described with reference to FIGS. 2 to 4, which are composed of three continuous tanks or tanks, respectively. The stirring tank 10, the aeration tank 20 and the filtration tank 30 are configured, but a through-flow hole 41 is formed between the stirring tank 10 and the aeration tank 20, the aeration tank 20 and the filtration tank ( The upper part of 30 is partially open to form the flow part 42.

First, the stirring tank 10 has a shaft 11 is supported up and down by a bearing therein, a plurality of impellers (12, impeller) is fixed to the shaft 11, the aeration tank 20 is It is provided with an aeration device 21 for evenly discharging the air supplied to the lower portion.

And the filtration tank 30 is provided with a sieve 31 having an empty hollow inside, the upper portion of the sieve 31 is a receiving tube 31a which is a pipe having a certain length, and the diffuser (which has a larger cross-sectional area) 31b) is integrally connected in sequence, and the accommodation pipe 31a and the stirring tank 10 constitute a return line 43 connected by a pipe.

In addition, a hollow fiber membrane module 32 is configured inside the sieve 31, which constitutes a bundle in which a plurality of hollow fiber membranes 32a of a predetermined length are formed, as shown in FIGS. 3 and 4. The upper and lower ends of the bracket are fixed to each other, and the filtered water filtered at each hollow fiber membrane 32a is collected by the lower side bracket, and configured to fall out through the outlet 36 formed at the lower part of the filtration tank 30. Inner lower portion of the spout 31, in detail, around the lower bracket of the hollow fiber membrane module 32 is provided with an air flotation device 35 for evenly discharging the supplied air, the air flotation device 35 And an air discharging means such as the aeration device 21 is formed by winding a pipe having a plurality of perforated holes in the longitudinal direction or installing an air diffuser.

In addition, the lower side of each of the stirring tank 10, the aeration tank 20, and the filtration tank 30 are formed with drains 13, 22, 33 for discharging all the internal water, respectively, and each stirring tank 10 Each of the upper and the aeration tank 20 is provided with a level sensor (level sensor) (14, 34), respectively, to detect the level of the waste water at each position, to prevent overload, the stirring tank (10), The main body 40 is constituted by the aeration tank 20 and the filtration tank 30.

A peripheral device is connected and operated to the outside of the body portion 40 configured as described above. Referring to FIG. 1, first, the motor 51 is connected to the shaft 11 of the stirring vessel 10. (11) rotates the impeller 12 fixed thereto, and a pump pump 53 is provided, which connects the agitator tank 10 and the storage tank 52 in which waste water is stored, thereby pumping the pump pump 53. Waste water is introduced into the stirring tank 10, and then, an air compressor 54 is provided, and the air is supplied to the aeration device 21 and the air support device 35, respectively, to supply compressed air.

In addition, a suction / pressure pump 55 is provided, which is connected between the discharge port 36 of the filtration tank 30 and the water supply tank 56 storing the filtrate, and the suction / pressure pump 55 is discharge port 36. ) And a water supply tank 56 in parallel with each other, and the inlet and outlet positions are changed in accordance with the operation function of the suction / pressure pump 55 to suck or press the inside of the hollow fiber membrane 32a. Manual or automatic operation is performed through a panel (not shown) with various buttons formed on the outside, and thus, such as a motor 51, a pump pump 53, an air compressor 54, a suction / pressure pump 55, and a panel The peripheral device together with the main body 50 constitutes a wastewater treatment apparatus.

In the wastewater treatment apparatus thus constructed, the main body portion 40 is embedded as usual, and peripheral devices are connected and configured to the main body portion 40, and the operation process of the fluid (air and wastewater) shown in FIG. Referring to the flow chart, it is first introduced into the waste water of the storage tank 52 by the pump pump 53, the incoming waste water is preferably already filtered to some extent through the screen or settlement in the storage tank 52, Then, the waste water of the stirring tank 10 is stirred by the operation of the motor 51 and the rotation of the impeller 12.

Waste water of the stirring tank 10 is moved to the aeration tank 20 through the lower flow hole 41, the aeration tank 20 receives the compressed air from the air compressor 54 aeration device 21 By blowing air, the aerated waste water is filled to the aeration tank 20 to a certain height, overflows to the open flow portion 41 of the upper flows into the filtration tank (30).

 Thus, the wastewater introduced into the filtration tank 30 is filled and filled into the trough 31, and at this time, the compressed air is received from the air compressor 54 and aerated air through the air flotation device 35 while aeration of the hollow fiber membrane Air bubbles are generated around the module 32, and at the same time, some waste water inside the spout 31 forms the inside of the hollow fiber membrane 32a at a sub-vacuum pressure through the suction / pressure pump 55, thereby separating The waste water inside the cylinder 31 is filtered while being sucked into and passed through the hollow fiber membrane 32a, and is discharged to the discharge port 36 to be collected by the water supply tank 56. 43 is passed back into the stirring tank (10).

When a gel layer is formed on the surface of each hollow fiber membrane 32a by the above-described process and washing is necessary, the discharge direction of the suction / pressure pump 55 is changed, and the filtered water of the water supply tank 56 is replaced with a hollow fiber membrane module ( 32) to remove the gel layer formed on the surface by backwashing.

In other words, the wastewater treatment device, the introduced wastewater is cultured by the aerobic microorganisms in the stirring process of the stirring tank 10, and then in the aeration tank 20 through the air supply and aeration device 21 to aerobic microorganisms in the water While rapidly incubating them, and then agglomerated them, the waste water introduced into the trough 31 of the filtration tank 30 is filtered through the hollow fiber membrane module 32, at this time by the operation of the air flotation device 35 hollow fiber membrane module 32 Air bubbles are generated around the membrane to minimize the formation of the gel layer on the surface of the hollow fiber membrane 32a, and in the case of cleaning due to the formation of the gel layer, the suction / pressure pump 55 is operated to filter the filtered water of the water supply tank 56 to a predetermined pressure. Pressurized by the hollow fiber membrane module 32 to remove the gel has a feature that makes the overall management easy.

And some waste water in the sieve (31) is introduced into the stirring tank (10) via the return line 43 of the upper portion, the part is passed through the aeration tank 20 and the filtration tank (30) and the semi-aerobic microorganisms and Cultivation of aerobic microorganisms takes place, some of which are removed by degassing with nitrate nitrogen.

Furthermore, the wastewater introduced into the main body 40 has a long solids (microorganism or sludge) retention time (SRT, Solids Retention Time) through the stirring tank 10, the aeration tank 20, and the filtration tank 30, and thus the nitrification rate. To increase the degassing by activating the microorganisms with the supplied air to decompose organic matters and to generate nitrogen nitrate through the denitrification reaction, and to reduce the amount of excess sludge generated by the increase of the sludge asset, through the hollow fiber membrane module By filtration through, all polymeric materials (SS, E. coli, virus, bacteria, bacterial vibrio, red algae, oil, colloidal solution, pyrogen, etc.) are concentrated and removed. This is not necessary, and the filtrate thus generated can be recycled into a backwash of the hollow fiber membrane module or the wash water of a bathroom.

On the other hand, referring to the nitrogen removal process by a biological treatment made by the injection of air as described above, which is a variety of microorganisms to change the nitrification and the conversion of ammonia nitrogen to nitrate nitrogen and the nitrate nitrogen to nitrogen gas Denitrification is required, and the nitrification is usually performed by two species: nitrosomonas, which oxidizes ammonia nitrogen to nitrite nitrogen, and nitrobacter, which oxidizes nitrite nitrogen to nitrate nitrogen. And, these oxidation processes are represented by chemical formulas as follows.

^{_{NH 4 + + 1.5O 2 → NO}} 2 - + H 2 O + 2H + + Cells (Oxidizes ammonia nitrogen to nitrite nitrogen)

^{_{NO 2 - + 0.5O 2 → NO}} 3 - + Cells (Oxidizes nitrite nitrogen to nitrate nitrogen)

And when the nitrate nitrogen generated by the nitrification reaction to the microorganisms decompose the organic matter, nitrite ion _{^{(NO 2 -, NO 3 -}} ) a, while using a combination of oxygen as a final electron acceptor, nitrite nitrogen contained in Denitrification is changed to nitrogen gas, and the chemical formula related thereto is shown in the following Chemical Formula 3, and this denitrification reaction requires an organic carbon source because it is an organic decomposition reaction.

^{_{6NO 3 - + 5CH 3 OH →}} 3N 2 ↑ + 7H 2 O + 4OH - ( denitrification process)

As described above, the present invention includes a stirring tank for stirring the introduced waste water, an aeration tank for culturing and agglomerating aerobic microorganisms by releasing air (oxygen) through the aeration apparatus to the waste water introduced by stirring, and receiving the waste water of the stirring tank and the aeration tank. A wastewater treatment device composed of a main body composed of a filtration tank filtered through a hollow fiber membrane module and a peripheral device operating the main body is provided, and the aerobic microorganisms are cultured in the stirring tank and the aerobic microorganisms are cultured and denitrified in an aeration tank. It removes organic matter and nitrogen contained in waste water and effectively treats waste water such as domestic wastewater, toilet and livestock wastewater and factory wastewater by precise filtration through hollow fiber membrane.

In addition, the main body portion is composed of three tanks or tanks continuously connected, the space is used as a compact structure of the main body consisting of a stirring tank with an impeller fixed to the rotating shaft, an aeration tank formed with an aeration device, a filtration tank formed with a hollow fiber membrane module And it is easy to bury, the lower portion of the hollow fiber membrane module is supplied with air from the air compressor, to form an air flotation device for discharging the air evenly like the diffuser, forming a gel layer on the surface of the hollow fiber membrane through the air bubbles generated during filtration Minimize the effect.

The upper part of the trough is formed with a return line connected to the agitator and pipe, and some waste water inside the trough is introduced into the agitator and circulated in the main body while degassing the nitrate nitrogen generated by the microorganism with nitrogen gas. Has the effect of maximizing nitrification and denitrification.

In addition, the hollow fiber membrane module of the filtration tank is filtered by the suction / pressure pump connected from the outside with suction force according to the discharge during filtration, and backwashing the hollow fiber membrane due to pressurization of the filtered water when removing the gel on the surface of the hollow fiber membrane. It is easy to manage.

Claims (7)

In the wastewater treatment apparatus for introducing the wastewater and filtering, Filtration tank 30 equipped with an aeration tank 10 for stirring waste water, an aeration tank 20 having an aeration device 21 of air releasing means for releasing air, and a hollow fiber membrane module 32 of a hollow fiber membrane 32a bundle. A waste water treatment device composed of a main body 40 composed of a) and a peripheral device for operating the main body 40 is formed, and the culturing and denitrification process of the aerobic microorganisms through the aeration tank and the aerobic microbial culture. And, wastewater treatment apparatus using a membrane separation process characterized in that to filter the wastewater through the hollow fiber membrane. The method of claim 1, The main body portion 40 is composed of three tanks and water tanks in sequence with one wall, respectively, a stirring tank 10 having a plurality of impellers 12 fixed to a shaft 11, and an aeration device at a lower portion thereof. Aeration tank 20 having a 21, and a filtration tank 30 provided with the hollow fiber membrane seedlings 13, the flow hole 41 penetrated through the lower wall between the agitator tank 10 and the aeration tank 20 ) Is formed, and the upper portion of the wall between the aeration tank 20 and the filtration tank 30 is formed with an open flow portion 42, and has a compact body portion in which waste water flows sequentially through the flow hole and the flow portion. Wastewater treatment device using a membrane separation process. The method of claim 2, The hollow fiber membrane module 32 is formed under the air flotation device 35 of the air release means for releasing air, at least the hollow tube membrane 31 surrounding the air flotation device 35 at least the hollow fiber membrane module 32 The waste water treatment apparatus using the membrane separation process, characterized in that to form a height of, to minimize the formation of a gel layer on the surface of the hollow fiber membrane by the air flotation device. The method of claim 3, wherein The upper part of the trough (31) constitutes a return line (43) connected to the stirring tank (10) by a pipe, and some waste water inside the trough is introduced back into the stirring tank to nitrogen nitrate nitrogen generated by the microorganisms nitrogen Degassing with gas, waste water treatment apparatus using a membrane separation process, characterized in that to maximize the nitrification and denitrification of the waste water by circulation of the body portion through the return line. The method according to any one of claims 1 to 4, The peripheral device is installed on the outside of the main body portion 40, the motor 51 is connected to the shaft 11 of the stirring vessel 10, and the air compressor 54 is connected to and constitutes the air discharge means, respectively. In order to supply the waste water to be filtered to the stirring tank 10 by a pump pump 53, the suction / pressurizing pump 55 is connected to the hollow fiber membrane module 32 and discharged in parallel with the circuit. Wastewater treatment system using membrane separation process characterized in that the peripheral device is configured by connecting and fixing. The method of claim 5, The air discharge means is a wastewater treatment apparatus using a membrane separation process characterized in that the configuration surrounding the pipe formed with a plurality of holes through the longitudinal direction. The method of claim 5, The air discharge means, waste water treatment apparatus using a membrane separation process, characterized in that to maximize the oxygen supply by installing an acid pipe.

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