WO2011059218A2

WO2011059218A2 - Hybrid water treatment apparatus based on sbr and mbr

Info

Publication number: WO2011059218A2
Application number: PCT/KR2010/007893
Authority: WO
Inventors: 김현욱; 권오성; 이인규
Original assignee: 서울시립대학교 산학협력단
Priority date: 2009-11-10
Filing date: 2010-11-10
Publication date: 2011-05-19
Also published as: WO2011059218A3

Abstract

The present invention relates to a hybrid water treatment apparatus based on an SBR and an MBR as the technique for stably treating feed water to be treated, such as sewage, wastewater, digested waste, and the like, which connects SBR and MBR processes and uses hydraulic characteristics by moving a membrane module up and down to retard the contamination generated in a membrane for minimizing the contamination of a membrane module for an MBR process and for using the membrane module for a long time. The hybrid water treatment apparatus based on an SBR and an MBR according to the present invention comprises: an SBR comprising a first reactor where feed water flows, a diffuser provided inside the first reactor, and a blower for supplying air to the diffuser; and an MBR comprising a second reactor where the treated water passed through the first reactor flows, a membrane module provided inside the second reactor, and a lifting means for raising the membrane module if the concentration of sludge increases according to the inflow of the treated water.

Description

SVR and MBR hybrid water treatment devices

The present invention is a technology for stably treating target raw water, such as sewage, sewage and digestive waste liquid,

In order to minimize contamination of the membrane module for the MBR process and to delay contamination of the membrane for long-term use, the SVR and MVR mixes that use hydraulic characteristics are moved up and down. A molding water treatment apparatus.

The present invention is basically a technique for removing water pollutants generated in a general living system such as sewage and sewage, and the most common method of treating sewage and sewage is the removal of organic matter, nitrogen, and phosphorus by microorganisms.

A commonly used microbial process is a method of oxidizing and removing organic substances in water represented by COD and BOD by using aerobic microorganisms existing in water by the standard activated sludge method. However, the standard activated sludge process cannot remove nutrients that cause eutrophication in rivers, lakes and oceans, such as nitrogen and phosphorus, other than organic matter.

Increasing environmental awareness, in order to solve the problem of eutrophication that occurs repeatedly in the summer, interest in the treatment of nitrogen, phosphorus is increasing, for this purpose, the treatment of nitrogen, phosphorus using microorganisms is rapidly introduced. Representative nitrogen and phosphorus treatment process is A2O process. The composition of the process is anaerobic tank, anaerobic tank, sewage and sewage flow into anaerobic tank to release phosphorus from anaerobic tank and transfer to anaerobic tank. , Removed. The ammonia nitrogen in the influent flowing into the aerobic tank through the anaerobic tank is oxidized to nitrite and nitrate by the active microorganism under aerobic conditions, and organic matter is removed at the same time. The oxidized nitrogen component is transferred to an oxygen-free tank through internal transport, and is reduced to nitrogen gas under anoxic conditions and discharged and removed to the atmosphere. In particular, phosphate ions released from the anaerobic tank are removed microorganisms under aerobic conditions.

As such, general nitrogen and phosphorus treatment using microorganisms is performed through anaerobic, anaerobic and aerobic conditions. The SVR process implements this reaction by changing the conditions over time in a single reactor, and determines the air supply time to achieve aerobic conditions and the air cutoff time to achieve anoxic conditions to remove nitrogen and phosphorus in the water. do. SVR process is characterized by being able to control the process more efficiently than the general A2O process by using the time, such as air supply time, blocking time, settling time as a major factor. In particular, by detecting the biochemical properties of the nitrification, denitrification, etc. using sensors such as pH, DO, ORP, automatic control according to the state of the reactor is possible.

However, the SSR process has a problem in that it is difficult to continuously process the new influent until the first influent is completely discharged because each unit process must be performed over time in a single reactor. In addition, since it is a process using a microorganism, it is difficult to secure stable water at all times due to the change in the sedimentation property according to the change of the operating environment such as the state and temperature of microorganisms and the load change of pollutants.

On the other hand, the membrane process is a water treatment technology currently attracting the most attention in water treatment and sewage treatment is a technique for excluding particles larger than the fine pores by using fine pores formed on the surface of the separator consisting of a polymer. The membrane process is based on the size of the micropores formed on the surface of the membrane, microfiltration (MF, micro-filtration), ultra-filtration (UF, ultra-filtration), nanofiltration (NF, nano-filtration), reverse osmosis (RO, reverse) osmosis) and is used for various purposes depending on the size of micropores.

Since the membrane process is basically processed through a sieving effect, the technology to secure water quality stability of treated water through the advantage of completely removing particulate matter in water purification and sewage treatment processes. to be. However, materials that do not pass through the micropores of the membrane is accumulated on the surface of the membrane causing contamination of the membrane has a problem that the filtration efficiency is lowered. This problem is called membrane fouling. If the membrane contamination continues, the filtration efficiency decreases and periodic chemical cleaning and physical cleaning must be performed to recover the membrane fouling. Therefore, minimizing contamination of the separator is a major issue.

The process of treating sewage, sewage, and wastewater by using a membrane is generally called a membrane bio-reactor (MWR). The MBR process has the advantage of completely removing the particulate matter in the final treated water by using the sieving effect of the separator without relying on precipitation as the conventional microbial process. As a result, microorganisms 3 to 4 times more than the concentration of activated sludge used in the general microbial process can be used, and thus the processing time of contaminants can be shortened and higher processing efficiency can be expected. However, this also causes a high concentration on the membrane surface due to the problem of filtering out the high concentration of microorganisms as described above. Thus, the permeability (filtration efficiency) of the membrane is reduced by the sludge formed as a cake. In order to prevent this, efforts are made to reduce membrane contamination by supplying air from the bottom and using scrubbing and scouring effects of air.

However, the membrane pollution reduction effect by the turbulence generated from the air is limited and has a disadvantage of requiring a high operating cost because it must maintain a high air supply continuously.

At present, a water treatment system linking a process using SVR and a process using MBR has been proposed, but an appropriate method for minimizing the contamination of the membrane module and delaying the contamination to be used for a long time has not been proposed.

In order to solve the problem, the present invention is linked to the SVR and MBR processes, and the membrane module is moved up and down to minimize the contamination of the membrane module for the MBR process and delay the contamination for long-term use. It is an object of the present invention to provide a SVR and MBR hybrid water treatment apparatus that minimizes contamination by using the same.

In addition, the present invention arranges the diffuser in the lower portion of the membrane module, and the diffuser is configured to be elevated together with the membrane module, when the membrane module is transferred to the upper portion of the diffuser located at the bottom of the membrane module as well Since the lower end of the second reactor for MBR becomes a relatively quiet point, the sludge inside the first reactor is concentrated and concentrated at the lower end, and the upper part has a relatively low sludge concentration. It is an object of the present invention to provide a SVR and MBR hybrid water treatment apparatus capable of minimizing contamination of the membrane module by filtration using the membrane module.

In addition, the present invention introduces a plurality of SSR to which the different reactions proceed, when the SSR process is composed of a single reactor, the SSR and the problem that can solve the problem of a large amount of water to be treated and requires continuous treatment An object of the present invention is to provide an MBR hybrid water treatment apparatus.

Furthermore, the present invention introduces a conveying line including a pump for conveying the concentrated sludge in the second reaction tank to the first reaction tank, thereby linking the SV process with the MBR process and eliminating the need for consideration of the sludge settling in the SV process. Activated sludge of concentration can be used, so short treatment time is required to treat the target sewage, so the treatment process can be configured more simply and the SVR and MBR mixed water treatment devices can be minimized due to the short treatment time. It aims to provide.

In order to achieve the object SBR and MBR mixed water treatment apparatus according to the present invention is

The first reactor into which raw water flows,

An diffuser provided in the first reactor,

Blower for supplying air to the diffuser

SVR containing a; And

A second reaction tank into which the treated water passed through the first reaction tank is introduced;

A membrane module provided in the second reactor,

Lifting means for raising the membrane module when the sludge concentration increases with the inflow of treated water

MWR comprising a;

It is made, including.

In the SV and MBR mixed water treatment apparatus according to the present invention

A diffuser is provided below the membrane module, the diffuser is lifted together with the membrane module and further includes a blower for supplying air to the diffuser.

There are a plurality of SVRs in which different reactions proceed,

It is preferable to further include a conveying line including a pump for conveying the concentrated sludge in the second reaction tank to the first reaction tank.

As described above, the SVR and MBR mixed water treatment apparatus according to the present invention is linked to the SVR and MBR processes, and minimizes the contamination of the membrane module for the MBR process and delays the contamination so that it can be used for a long time. By moving up and down, the hydraulic characteristics can be used to minimize contamination, and by arranging an diffuser under the membrane module, the diffuser can be elevated together with the membrane module, so that the membrane module is transferred upward. In the same way, the diffuser located at the bottom of the membrane module is also transferred to the upper part so that the lower end of the second reactor for MBR becomes a relatively quiet point, and the sludge inside the first reactor is concentrated and concentrated on the lower part. Has a relatively low sludge concentration As a result of the filtration using the membrane module in a low sludge concentration region, contamination of the membrane module can be minimized, and when the SVR process is composed of a single reactor by introducing a plurality of SVRs in which different reactions are performed. In the case of a large amount of water to be treated and a need for continuous treatment, a problem can be solved, and a conveying line including a pump for conveying the concentrated sludge in the second reaction tank to the first reaction tank is introduced, By linking the MBR process, it is not necessary to consider the sedimentation of sludge in the SBR process, so that high concentration of activated sludge can be used. Therefore, the treatment process can be made simpler because it requires only a short treatment time to treat the target sewage. Treatment time can minimize plant floor .

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

2 is a schematic view relating to a modification of the water treatment device according to the present invention.

Explanation of symbols on the main parts of the drawings

A: Water treatment device 10: SVR

11: Reactor 1: Reactor

15: stirrer 20: MBR

21: second reactor 23: membrane module

25: lifting means 27: diffuser

30: conveying line 31: conveying pump

40: treated water discharge line 41: drain pump

B: blower S: sensor

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

Since the present invention may be modified in various ways and have various forms, embodiments (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In each of the drawings, the same reference numerals, in particular, the tens and ones digits, or the same digits, tens, ones, and alphabets refer to members having the same or similar functions, and unless otherwise specified, each member in the figures The member referred to by the reference numeral may be regarded as a member conforming to these criteria.

The terminology used herein is for the purpose of describing particular aspects (or embodiments) only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms “comprises” or “consists” are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

In the present specification, the first to the second and the second will only refer to different components, and are not limited to the order of manufacture, and their names in the detailed description of the invention and the claims. This may not match.

The core of the present invention relates to a process for removing contaminants generated from raw water to be treated, such as sewage, sewage, and wastewater. Sequencing batch reactor (SBR) to remove nitrogen-based contaminants (ammonia nitrogen, etc.) in water through continuous aerobic and anoxic conditions

It is a technology for producing the final treated water through the membrane module constituting the MBR, particularly submerged membrane module, the treated water reduced pollution load.

In addition, the present invention uses the SSR process that can be easily controlled through a sensor, etc. in order to remove organic substances present in sewage, sewage and wastewater, and stably remove nutrients nitrogen and phosphorus, and constitute MBR at the rear end. It is a technology for more stable treatment of the concentration of organic matter and nutrients in the final treatment water through the complete removal of particulate matter by using a membrane module.

The SVR process is generally performed in a single reactor by phosphorus release, denitrification, and nitrification by changing conditions and time differences. As described above, this makes continuous processing impossible and the processing is intermittent. In addition, the sedimentation of the sludge is not completely secured, and there is a possibility that the water quality of the treated water may change due to the outflow of the sludge.

Therefore, in the present patent, if a continuous treatment of the subject, including a single SSR process, the SSR process is composed of two stages or three stages in multiple stages so that the inflow time between the reaction tanks can be continuously processed.

The MBR process is located at the end of the SSR process, and the sludge is separated between the treated water and the sludge in the MBR process through phosphorus release denitrification and phosphorus nitrate absorption in the SSR reactor. Therefore, the SVR process does not require special consideration for sedimentation for sludge separation.

By linking the SVR process with the MBR process, the SSR process eliminates the need for consideration of the sludge settling properties, so that activated sludge of high concentration (8,000 to 10,000 mg / L) can be used. By using a high activated sludge concentration, only a short treatment time is required for treating the target sewage, so that the treatment process can be configured more simply, and the treatment plant site can be minimized due to the short treatment time.

The present invention proposes the movement of the membrane module as a method for minimizing the contamination of the separator in the MBR process. In a typical MBR process, the membrane module is fixed to the bottom of the reactor.

As a result, particulate matter and sludge that do not penetrate the separator over time are continuously concentrated in the reaction tank, and the separator which has to exclude a higher concentration of sludge is rapidly contaminated as the concentration of sludge increases. In order to solve this problem, in the present invention, when the sludge introduced in the SBR process is introduced into the MBR reaction tank for the first time, the membrane module is placed at the bottom to perform filtration at low pressure by using high water pressure. As the sludge is concentrated in the interior, the membrane module is transferred to the upper part so as to delay the contamination of the separator by performing the filtration in the upper part of the reactor where the sludge is settled in the lower part where the membrane module is not located and the sludge sediment is relatively low. do.

As can be seen in FIG. 1, the hybrid type water treatment apparatus A according to the present invention is composed of SVR 10 and MBR 20. Raw water introduced into the process flows into the first reactor 11 for the progress of the SVR process and undergoes anaerobic, anaerobic and aerobic conditions over time, and contains organic substances and nutrients in the raw water. Is removed.

Duration and acid amount of each condition is controlled by the sensor unit S consisting of sensors such as pH, DO, ORP.

When the target raw water flows and requires anaerobic conditions, the first reactor 11 (SVR Reactor) is connected through a blower B connected to an aerator 13 provided in the first reactor 11. The supply of air to the water) is cut off, and DO is completely maintained at 0 (preferably equipped with an agitator 15 in the first reactor).

If no further denitrification occurs at the time when anaerobic and anaerobic conditions are maintained, the aerobic conditions are maintained by supplying air into the first reactor (11).

When a state in which both nitrification and organic matter decomposition are performed under aerobic conditions is detected through the sensor unit S for pH, ORP, DO, and the like, the second reaction tank 21 for treating MWR 20 in this state is treated. (MBR reactor) ('membrane separation tank' is more accurate than the second 'reactor').

At this point, the second reactor 21 for the MBR 20 receives the treated water that has been treated through the first reactor 11 for the previous SV 10, particularly the submerged membrane module 23. Is performing filtration through

Immediately before the treated water of the first reaction tank 11 in the present state flows, the concentrated sludge settled in the lower part is returned to the first reaction tank 11 of SV. For this purpose, it is preferable that the conveying line 30 provided between the two reaction tanks 11 and 21 is provided with a pump 31 for concentrating recycling.

After this process, the treated water in the SVR process is introduced into the second reactor 21 of the MBR 20,

Since the concentration of the introduced sludge is not high at the beginning of the inflow, the membrane module 23 is positioned below the second reactor by the elevating means 25.

Meanwhile, the treated water having passed through the first reaction tank 11 is transferred to the second reaction tank 21 using various methods. For example, a natural flow method may be used.

After the sludge is filled in the second reactor 21, the membrane module 23 starts filtration.

In the case of the natural flow method (for this purpose, it is preferable to provide a valve, in particular, an electric valve V (Sol. Valve) for automatic control between the two reactors 11 and 21). Is high and the membrane module 23 is located at the bottom, so that filtration occurs easily under high water pressure.

Filtration is carried out continuously so that the treated water is discharged, thereby contaminating the membrane as the sludge concentration in the second reactor 21 increases.

Therefore, when the concentration of sludge in the MBR 20 second reactor 21 is increased, the membrane module 23 is transferred upward by using the elevating means 25.

The elevating means 25 includes, for example, a winch reel 25A operated by the motor 25B, and the wire 25a connecting the membrane module 23 and the winch reel 25A is connected through a roller 25b. The direction is switched so that the reel 25A can be wound and unwinded smoothly.

Various other lifting means can be implemented, but the lifting means is preferably configured using a motor or a hydraulic (or pneumatic) cylinder in consideration of the automation control.

When the membrane module 23 is transferred upward, the diffuser 27 (also connected with the blower B) located at the bottom of the membrane module is also transferred upward.

The lower part of the second reactor 21 is a relatively quiet point because the diffuser 27 is transferred upward.

Therefore, the sludge contained in the treated water supplied from the first reaction tank 11 is concentrated and sedimented at the lower end of the second reaction tank 21. As such, the sludge is naturally precipitated and concentrated at the bottom of the second reactor 21, so that the upper portion has a relatively low sludge concentration. Filtration occurs in such low sludge concentration regions, thereby minimizing contamination of the membrane module 23.

By repeating such a process, high efficiency may be indicated to remove contaminants, and contamination of the membrane module 23 may be minimized.

The final treated water passing through the MBR 20 is discharged through the treated water discharge line 40, the discharge line 40 is provided with a suction pump (41),

In addition, in order to implement central automatic control of the water treatment process together with the sensor unit S provided in the first reactor 11, a pressure gauge 43 and a flow transmitter 45 are provided in the discharge line 40. It is preferable that it is provided.

The SV and MBR mixed water treatment apparatus described above with reference to FIG. 1 is a case where the SV process is composed of a single reactor.

If the amount of water to be treated is large and continuous treatment is required, the treatment is not possible with a single reactor.

Therefore, when the number of objects to be treated is large or when it is difficult to secure sufficient processing time, it is preferable to use the deformation apparatus as shown in FIG. 2.

FIG. 2 is a schematic apparatus diagram in which two first reactors 11 for

SBR

10A and 10B and one second reactor 21 for MBR 20 are linked.

As can be seen in FIG. 2, the two first reactors 11 for SVR start the treatment sequentially.

While the treatment reaction takes place in one SBR (10A) first reactor (11)

The treated water which has already been treated in the first reactor of another SBR 10B is transferred to the second reactor 21.

The second reactor undergoes filtration in the same order as described above with reference to FIG. 1.

When the filtration is finished, by receiving the treated water from the first reaction tank of the other SBR (10A) that has already completed the reaction, by performing filtration continuously,

It is possible to have a continuity of the process, which can treat a large amount of target wastewater. If necessary, the number of first reactors may be increased or decreased.

Furthermore, more than one second reactor 21 and membrane module 23 for MBR 20 may be introduced as necessary.

Although the well-known techniques are omitted in the above description, those skilled in the art can easily infer, infer, and reproduce them.

In addition, in the above description of the present invention, the water treatment apparatus having a specific shape and structure has been described with reference to the accompanying drawings, but the present invention can be variously modified, changed, and replaced by those skilled in the art. It should be interpreted as falling within the protection scope of the present invention.

Claims

The first reactor into which raw water flows,

An diffuser provided in the first reactor,

Blower for supplying air to the diffuser

SVR containing a; And

A second reaction tank into which the treated water passed through the first reaction tank is introduced;

A membrane module provided in the second reactor,

Lifting means for raising the membrane module when the sludge concentration increases with the inflow of treated water

MWR comprising a;

SBR and MBR mixed water treatment device comprising a.
The method of claim 1,

A diffuser is provided below the membrane module, and the diffuser is elevated together with the membrane module.

SBR and MBR mixed water treatment apparatus further comprises a blower for supplying air to the diffuser.
The method of claim 1,

SVR and MBR hybrid water treatment apparatus, characterized in that a plurality of SVR to which different reactions proceed.
The method according to any one of claims 1 to 3,

SBR and MBR mixed water treatment apparatus further comprising a conveying line including a pump for conveying the concentrated sludge in the second reaction tank to the first reaction tank.