KR101395188B1 - Wastewater disposal apparatus having membrane module and method thereof - Google Patents

Abstract

The present invention relates to a waste water treatment device equipped with a membrane module and a method therefor. More specifically, the present invention relates to a waste water treatment device equipped with a membrane module and a method therefor, wherein a screen tank, anaerobic tank, oxygen-free tank, MBR tank, and SDR tank are sequentially disposed in the waste water treatment device. The membrane module is included in the MBR tank, and an aerator part is equipped on the circumference of the membrane module, wherein a plurality of vertical supply pipes and horizontal supply pipes are disposed to be separated at a particular distance from the membrane module and are coupled in a grid shape in order to form the aerator part. Therefore, the amount of dissolved oxygen is increased, and cake layers accumulated on the membrane module are effectively removed. The waste water treatment device equipped with a membrane module of the present invention comprises: a screen tank which filters inert matter and suspended material from waste water that is fed through a feeding pipe equipped on one side thereof; an anaerobic tank which is connected with the screen tank and is equipped with an underwater agitator so as to remove phosphorous from treated water that is treated in and transferred from the screen tank; an oxygen-free tank which is connected with the anaerobic tank and is equipped with an underwater agitator so as to denitrify the treated water that is transferred from the anaerobic tank; an MBR tank which is connected with the oxygen-free tank and is equipped with a membrane module so as to remove residual organic materials from the treated water that is fed from the oxygen-free tank and separate solid and liquid from water and sludge; an SDR tank which is connected with the MBR tank so as to perform sulfur denitrification on the treated water that is fed from the MBR tank; and a discharge pipe which discharges the treated water that is filtered from the SDR tank. On the circumference of the membrane module, an aerator part is formed, wherein a plurality of vertical supply pipes and horizontal supply pipes are disposed to be separated at a particular distance from the membrane module and are coupled in a grid shape in order to form the aerator part, and multiple air nozzles are equipped on each side surface of the aerator part.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a wastewater treatment apparatus having a membrane module,

The present invention relates to a wastewater treatment apparatus having a separation membrane module and a method thereof, and more particularly, to a wastewater treatment apparatus in which a screen tank, an anaerobic tank, an anoxic tank, an MBR tank and an SDR tank are sequentially disposed, A plurality of vertical supply pipes arranged to be spaced apart from the separation membrane module by a predetermined distance around the module and an acid diffusion section in which a horizontal supply pipe is connected by a grid are provided to increase the dissolved oxygen amount and to remove the cake layer accumulated in the separation membrane module The present invention relates to a wastewater treatment apparatus and a method thereof.

Water is an essential resource for the survival of humans and other animals and plants. However, these water resources are facing serious problems globally due to population increase and environmental pollution.

In particular, in order to improve the water quality of wastewater due to wastewater such as domestic wastewater, septic wastewater in housing or livestock wastewater, it is very important to remove not only organic matter but also nitrogen and phosphorus. Therefore, Standards are gradually being strengthened.

In general, biodegradation by autotrophic microorganisms and denitrification by heterotrophic microorganisms are mainly used for nitrogen removal.

Nitrogen and phosphorus treatment processes with biological elevation process are many processes such as Anaerobic Anoxic Oxic Process, Modified Bardenpho Process and UCT (University of Cape Town), and A2 / Have been used. The composition of this process is a unit process in which an anaerobic tank, anoxic tank, and aerobic tank are connected in series.

However, these processes have difficulty in ensuring stable treatment water at all times because the sedimentation is changed in accordance with the change of the operating environment such as microbial state and temperature change and pollutant load change during operation.

In order to solve these problems, introduction of new technologies such as MBR (Membrane Bio-Reactor) process capable of stable treatment with respect to the influent water quality and microorganism characteristics of wastewater is increasing. The MBR process is advantageous in that it can completely remove the particulate matter in the final treated water by utilizing the sieving effect of the membrane without depending on the precipitation as in the conventional microbial process.

As a related art, Japanese Patent Registration No. 1150335 entitled " SBR and MBR horn molding water treatment apparatus " includes a first reaction tank into which raw water flows, an acid catalyst provided in the first reaction tank, and a blower that supplies air to the acid catalyst It describes a water treatment system that further links the MBR process to the sequencing batch reactor (SBR) process.

However, the wastewater treatment apparatus using the MBR process generates much less excess sludge than conventional methods, which is disadvantageous in terms of removal of phosphorus.

In order to solve the above problems, the present invention provides a separation membrane module in which an MBR bath is added to completely remove nitrogen and phosphorus to ensure stable treated water, the treated water is returned through the circulation line, And a method for processing the wastewater.

In addition, in the present invention, in order to compensate for the low phosphorus removal capability which is a disadvantage of the MBR process, the present invention provides a wastewater treatment device having a separation membrane module further comprising a SDR (Sulfur Denitrification Reactor) tank for removing denitrification and phosphorus simultaneously, .

According to an aspect of the present invention, there is provided a screening apparatus for screening contaminants or floating substances in wastewater flowing through an inlet pipe provided at one side thereof. An anaerobic tank connected to the screen tank and treated in the screen tank to remove phosphorus in the treated water, the anaerobic tank having an underwater stirrer; An anoxic tank connected to the anaerobic tank for denitrification of the treated water transferred from the anaerobic tank and equipped with an underwater stirrer; An MBR tank connected to the anoxic tank and having a separation membrane module for removing residual organic matter from the treated water flowing in the anoxic tank and solid-liquid-separating the water and the sludge; An SDR tank connected to the MBR tank for performing the sulfur denitrification reaction of the treated water introduced from the MBR tank; And a discharge pipe for discharging the treated water filtered in the SDR tank, wherein a plurality of air nozzles are provided on each side of the separation membrane module, and a plurality of vertical supply pipes Wherein the air nozzle provided in the vertical supply pipe is provided so as to inject air toward the adjacent vertical supply pipe, and the air nozzle provided in the horizontal supply pipe is connected to the separator module side And the air is sprayed downward. The present invention also provides a wastewater treatment apparatus having the separation membrane module.

According to another preferred embodiment of the present invention, there is further provided a circulation line for returning the treated water of the MBR tank to the anoxic tank for re-denitrifying the nitrified water in the MBR tank.

According to another preferred embodiment of the present invention, there is further provided a chemical tank tank connected to the transfer pipe between the MBR tank and the SDR tank for supplying the alkalinity and the flocculant to the treated water transferred from the MBR tank to the SDR tank.

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According to another preferred embodiment of the present invention, there is provided a method for treating wastewater using a wastewater treatment apparatus having a separation membrane module, the method comprising the steps of: (a) removing contaminants or suspended matters in wastewater flowing through an inlet pipe ; (b) transferring the treated water treated in the screen tank to an anaerobic tank and stirring the treated water with an underwater stirrer; (c) introducing the treated water agitated in the anaerobic tank into an anoxic tank and denitrifying the anaerobic tank through agitation; (d) passing the treated water through the denitrification step to the MBR tank and passing through the membrane module; (e) the process water having passed through the separation membrane module flows into the SDR tank and is subjected to sulfur denitrification; And (f) the sulfur-denitrated process water is discharged through a discharge pipe; The present invention provides a wastewater treatment method using the wastewater treatment apparatus having the separation membrane module.

According to another preferred embodiment of the present invention, in the step (d), a part of the treated water transferred to the MBR tank is returned to the anoxic tank through the circulation line.

According to another preferred embodiment of the present invention, after the step (d), the method further comprises supplying alkalinity and a coagulant from the chemical tank tank connected to the transfer pipe between the MBR tank and the SDR tank and mixing the same.

The present invention further includes a circulation line including a screen tank, an anaerobic tank, anoxic tank, MBR tank, and SDR tank, in which part of the treated water is re-transported to the anoxic tank for re-denitrification in the MBR tank, .

In addition, the MBR tank according to the present invention can separate water and sludge by solid-liquid separation using a membrane module using a sieving effect in order to ensure stable treated water.

In addition, the present invention further includes a chemical tank tank in the transfer pipe between the MBR tank and the SDR tank to compensate for the low phosphorus removal capability, which is a disadvantage of the MBR tank, so that alkalinity and coagulant are removed from the chemical tank tank before the treatment water is introduced into the SDR tank. The phosphorus removal and the sulfur denitrification can be performed at the same time.

According to the present invention, furthermore, a plurality of vertical supply pipes having a plurality of air nozzles on the respective sides of the separation membrane module and an acid base portion in which the horizontal supply pipe is coupled by a grid are further provided, And the air nozzle provided in the horizontal supply pipe is provided so that the air is injected downward to the separation membrane module side so that the water is accumulated on the side of the separation membrane module It is effective in removing cake.

1 is a process diagram schematically illustrating a method for treating wastewater using a wastewater treatment apparatus equipped with a separation membrane module according to the present invention.
2 is a perspective view showing a separation membrane module and an acid base according to the present invention.
3 is a partial cross-sectional view illustrating a separation membrane module and a base part according to the present invention.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments.

1 is a process diagram schematically illustrating a method for treating wastewater using a wastewater treatment apparatus equipped with a separation membrane module according to the present invention.

As shown in FIG. 1, the wastewater treatment apparatus having the separation membrane module includes a screen tank 100 for filtering contaminants or floating substances in the wastewater flowing through the inlet pipe 10 provided at one side thereof. An anaerobic tank 200 connected to the screen tank 100 and equipped with an underwater stirrer 900 for removing phosphorus in the treated water that has been treated in the screen tank 100 and transferred; An anoxic tank 300 connected to the anaerobic tank 200 and having an underwater stirrer 900 for denitrification of the treated water transferred from the anaerobic tank 200; An MBR tank 400 connected to the anoxic tank 300 and having a separation membrane module 700 for removing residual organic matter from the treated water flowing in the anoxic tank 300 and solid-liquid separating the water and the sludge; An SDR tank 500 connected to the MBR tank 400 for performing a sulfur denitrification reaction of the treated water introduced from the MBR tank 400; And a discharge pipe (20) for discharging the treated water filtered in the SDR tank (500).

The screen tub 100 is a drum screen, and a mesh screen of 200 μm is removably installed on the inner side of the drum. As the drum rotates, a narrow or suspended matter contained in the wastewater is caught by rotation.

The contaminants and sediments formed in the lower layer of the screen tank 100 are taken out by regular cleaning.

The anaerobic tank 200 is provided with an underwater agitator 900 so that the activated sludge microorganisms in the anaerobic tank 200 and the treated water are mixed well. The activated sludge microorganism is removed by providing phosphorus as an energy source for synthesis in the process of synthesizing ATP.

The anaerobic tank 200 can be automatically operated by a timer, and the stirring operation can be performed by an underwater stirrer 900 that operates for 10 minutes and stops for 20 minutes.

The anoxic tank 300 is provided with an underwater stirrer 900 so that the treated water from which phosphorus has been removed from the anaerobic tank 200 is transferred and stirred by an underwater stirrer 900 to be denitrified. In the anoxic tank 300, denitrifying microorganisms are used to remove nitrate nitrogen into nitrite nitrogen and nitrite nitrogen into nitrogen gas.

The MBR bath 400 includes a circulation line 30 and a separation membrane module 700.

In order to remove organic matter and to achieve complete nitrification, the separation membrane module 700 uses a suction filtration type immersion separation membrane instead of a sedimentation tank to remove organic matter and improve the efficiency of nitrification, while separating water and sludge to produce clean treated water do.

The separation membrane module 700 is generally formed of two types of hollow fiber and flat-sheet. The separation membrane module 700 preferably has a membrane pore size of 0.1 탆 to 0.4 탆, It is difficult to produce clean treated water. On the other hand, if the size of the activated sludge particles is less than 0.1 탆, the cost of the separation membrane is increased and it is difficult to expect a better effect.

A plurality of air nozzles 811 and 821 are provided on the respective sides of the separation membrane module 700 and a plurality of vertical supply pipes 810 and horizontal supply pipes 820 ) Are coupled to each other by a lattice.

The circulation line (30) is configured to re-denitrify the denitrified treated water to the anoxic tank (300). This more efficient re-denitrification effect can be expected due to such repetitive re-conveyance.

The MBR process has an advantage of being very excellent in the quality of treated water and applicable to general reuse water, having a small area and a small burden on the reaction tank, and being easy to domesticate specific microorganisms such as nitrifying microorganisms in the reaction tank.

Therefore, the MBR process is reduced in maintenance points as described above, and remote automatic monitoring and control is easy.

In the SDR tank 500, denitrification and phosphorus removal are performed once more for the treated water flowing from the MBR tank 400.

The SDR (Sulfur Denitrification Reactor) process utilizes inorganic carbon such as HCO ₃ ^- as a carbon source by denitrifying bacteria independent of the inhabitants on the surface of sulfur particles without internal transport and supply of external organic carbon source, and nitrate nitrogen NO ₃ ^{- The} process in which denitrification occurs while using -N. This process produces a small amount of sludge and can achieve high denitrification efficiency in a short residence time. Further, in the SDR process, phosphorus remaining in the MBR bath 400 can be completely removed by passing a small amount of coagulant.

A chemical tank tank 600 is connected to the transfer pipe 40 between the MBR tank 400 and the SDR tank 500 to supply alkalinity and coagulant to the treated water conveyed to the SDR tank 500, So that it can be mixed with the treated water before entering the bath 500.

The alkalinity uses NaHCO ₃ as a chemical for denitrification, and the coagulant uses alum to remove phosphorus that has not been removed by a biological reaction.

It is preferable that the alkalinity and the flocculant are used in a liquid form for smooth mixing and a predetermined amount is supplied by a metering pump.

FIG. 2 is a perspective view illustrating a separation membrane module and an acid base according to the present invention, and FIG. 3 is a partial cross-sectional view illustrating a separation membrane module and an acid base according to the present invention.

As shown in FIGS. 2 and 3, a plurality of vertical supply pipes 810 and horizontal supply pipes 820 are connected to each other by a lattice around the separator module 700, .

A plurality of air nozzles 811 are provided in the vertical supply pipe 810 so as to inject air toward the adjacent vertical supply pipe 810 so that the treatment water flowing into the MBR tank 400 can approach the separation membrane module 700 It is possible to expose the air nozzle 811 provided in the vertical supply pipe 810 of the acid part 800 to increase the dissolved oxygen amount of the treated water.

The horizontal supply pipe 820 is also provided with a plurality of air nozzles 821. The air nozzles 821 are direction-adjusted so as to inject air downward to the separation membrane module 700 side. The air injected from the air nozzle 821 is effective to remove the cake accumulated outside the separation membrane module 700.

It is preferable that the air nozzle 821 is controlled to be in the range of 30 ° to 80 °. If the spray angle is too straight, the foreign matter accumulated on the outside of the separation membrane module 700 may be transferred to the inside of the separation membrane module 700 So that an adverse effect can be obtained.

The air sprayed from the air nozzle 821 provided in the horizontal supply pipe 820 removes the cake accumulated on the outside of the separation membrane module 700 and the surrounding foreign materials by physical force to prolong the life of the separation membrane module 700 Economic benefits can be obtained.

The wastewater treatment using the wastewater treatment apparatus having the separation membrane module 700 including the screen tank 100, the anaerobic tank 200, the anoxic tank 300, the MBR tank 400 and the SDR tank 500 according to the present invention The method will be described as follows.

First, (a) an inlet pipe 10 is provided at one side of the screen tank 100 to introduce wastewater into one side of the screen tank 100, and the inflowed wastewater flows through the screen and clogs or suspended substances are caught.

Next, (b) the treated water in the screen tank 100 is transferred to the anaerobic tank 200 connected to the screen tank 10. The anaerobic tank 200 is provided with an underwater stirrer 900 so that the microorganisms in the anaerobic tank 200 and the treated water are stirred to be well mixed.

(C) The treated water stirred in the anaerobic tank 200 is transferred to the anoxic tank 300 connected to the anaerobic tank 200 and is smoothly stirred and denitrified by an underwater stirrer 900 provided in the anoxic tank 300 .

Next, (d) the treated water having undergone the denitrification step is transferred to the MBR tank 400 provided with the separation membrane module 700 connected to the anoxic tank 300, and then passes through the separation membrane module 700.

In the step (d), a part of the treated water transferred to the MBR tank 400 is returned to the anoxic tank 300 through the circulation line 30 to be denitrified again.

(E) The treated water having passed through the membrane module 700 of the MBR tank 400 flows into the SDR tank 500 connected to the MBR tank 400 and performs a sulfur denitrification reaction.

After the above step (d), before the process water having passed through the separation membrane module 700 of the MBR tank 400 is introduced into the SDR tank 500, the transfer pipe between the MBR tank 400 and the SDR tank 500 40 and is supplied with alkalinity and coagulant from the chemical tank tank 600 and mixed.

Finally, (f) the treated water subjected to the filtration treatment in the SDR tank 500 is discharged through the discharge pipe 20.

10: inlet pipe 20: outlet pipe
30: circulation line 40: transfer pipe
100: Screen 200: Anaerobic
300: anoxic tank 400: MBR tank
500: SDR tank 600: chemical tank tank
700: Membrane module 800:
810: Vertical supply pipe 820: Horizontal supply pipe
811, 821: Air nozzle 900: Underwater stirrer

Claims (7)

A screen tank (100) for filtering contaminants or floating substances in the wastewater flowing through the inlet pipe (10) provided at one side;
An anaerobic tank 200 connected to the screen tank 100 and equipped with an underwater stirrer 900 for removing phosphorus in the treated water that has been treated in the screen tank 100 and transferred;
An anoxic tank 300 connected to the anaerobic tank 200 and having an underwater stirrer 900 for denitrification of the treated water transferred from the anaerobic tank 200;
An MBR tank 400 connected to the anoxic tank 300 and having a separation membrane module 700 for removing residual organic matter from the treated water flowing in the anoxic tank 300 and solid-liquid separating the water and the sludge;
An SDR tank 500 connected to the MBR tank 400 for performing a sulfur denitrification reaction of the treated water introduced from the MBR tank 400; And
And a discharge pipe (20) for discharging the treated water filtered in the SDR tank (500)
A plurality of air nozzles 811 and 821 are provided on the respective sides of the separation membrane module 700 and a plurality of vertical supply pipes 810 and horizontal supply pipes 820 Are formed in a lattice,
The air nozzle 811 provided in the vertical supply pipe 810 is provided to inject air toward the adjacent vertical supply pipe 810 and the air nozzle 821 provided in the horizontal supply pipe 820 is connected to the separation membrane module 700), and air is sprayed downward from the separation membrane module (700).
The method according to claim 1,
And a circulation line (30) for transporting the treated water of the MBR tank (400) to the anoxic tank (300) for re-denitrifying the nitrified treated water in the MBR tank (400) Wastewater treatment device.
The method according to claim 1,
A chemical tank tank 600 connected to the transfer pipe 40 between the MBR tank 400 and the SDR tank 500 for supplying alkalinity and coagulant to the treated water transferred from the MBR tank 400 to the SDR tank 500, Wherein the separation membrane module further comprises a separation membrane module.
delete A method for treating wastewater using a wastewater treatment apparatus having the separation membrane module (700) of claim 1,
(a) filtering the contaminants or floating substances in the wastewater flowing through the inlet pipe (10) provided at one side with a screen in the screen tank (100);
(b) transferring the treated water treated in the screen tank (100) to the anaerobic tank (200) and stirring the mixed water with an underwater stirrer (900);
(c) introducing the treated water stirred in the anaerobic tank (200) into an anoxic tank (300) and denitrifying the treated water through agitation;
(d) transferring the treated water through the denitrification step to the MBR tank (400) and passing through the membrane module (700);
(e) the process water having passed through the separation membrane module (700) is introduced into the SDR tank (500) to perform sulfur denitrification; And
(f) discharging the sulfur-depleted treated water through the discharge pipe (20); Wherein the separation membrane module is installed in the waste water treatment system.
6. The method of claim 5,
In the step (d), a part of the treated water transferred to the MBR tank 400 is re-transferred to the anoxic tank 300 through the circulation line 30, and the wastewater treatment Way.
6. The method of claim 5,
After the step (d), the method further comprises supplying and mixing the alkalinity and the flocculant from the chemical tank tank 600 connected to the transfer pipe 40 between the MBR tank 400 and the SDR tank 500 A waste water treatment method using an aqua water treatment device provided with a separation membrane module.

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