KR101089227B1 - Advanced Wastewater Treatment Apparatus using biomedia and biomembrane and Advanced Wastewater Treatment Method using the same - Google Patents

Abstract

The present invention relates to an integrated upstream circulating sewage and wastewater advanced treatment apparatus using a biofilm and a bioseparation membrane, and a sewage and wastewater advanced treatment method using the same. In the upflow biological treatment device is a wastewater flows in, the anaerobic state is maintained to perform a dephosphorization reaction, the biofilm tank having a biofilm carrier therein; Oxygen-free tank is supplied with the treated water discharged from the biofilm tank, the oxygen-free state is maintained to perform the denitrification reaction; And treated water treated in the anoxic tank, air is supplied from the outside to maintain an aerobic state, and nitrification and organic oxidation reactions are performed, and a biological separation membrane tank having a separator therein includes the biofilm tank and the anoxic tank. And an integrated upstream circulating sewage and wastewater advanced treatment apparatus using a biofilm and a bioseparation membrane, and a sewage and wastewater advanced treatment method using the same.

Through the present invention, not only can the treatment time and sludge generation amount be reduced, but also nitrogen and phosphorus can be effectively removed.

Sewage & Wastewater, Advanced Treatment, Biofilm, Bioseparation Membrane, Sludge

Description

Integrated Wastewater Treatment Apparatus using biomedia and biomembrane and Advanced Wastewater Treatment Method using the same}

The present invention relates to an integrated upstream circulation type sewage and wastewater treatment system using a biofilm and a bioseparation membrane, and a method for treating wastewater and wastewater using the same.

When nitrogen and phosphorus are present in the water, algae are generated and reproduced in large quantities by the action of the sun's rays in fresh or sea water, which causes dissolved oxygen depletion and toxins in the water. Therefore, it is very important to remove nitrogen and phosphorus in water to protect the environment and secure water resources.

The treatment for removing nitrogen and phosphorus, which are nutrients in water, from sewage and wastewater is called advanced treatment.

As the advanced treatment method, conventional sewage and wastewater advanced treatments using phosphorus release, denitrification and nitrification, and phosphorus intake using anaerobic tanks, anaerobic tanks and aerobic tanks are widely used.A2O (Anaerobic Anoxic Oxic Process) method and modification Treatment methods such as improved UCT and VIP are known.

In order to enhance the nitrogen removal effect in any process, sufficient nitrification occurs in the aerobic tank, sufficient phosphorus release from the anaerobic tank, and inflow from the anaerobic tank. Recirculation and denitrification of 1 to 6 times the amount of wastewater is carried out, and in the aerobic bath, luxury uptake of phosphorus should occur simultaneously with nitrification.

The A2O process is operated by an anaerobic process in which phosphorus is released from activated sludge returned from the settling basin, an anoxic process in which denitrification occurs, and an aerobic process in which nitrification and organic decomposition and luxury uptake of phosphorus occur. It is widely used.

However, this A2O method has a disadvantage in that the removal efficiency of nitrogen and phosphorus is relatively low. In addition, small-scale sewage treatment apparatus uses a lot of activated sludge or long-term aeration method in the early stage using suspended growth microorganisms, which is difficult to cope with the case of frequent sludge bulking and large load fluctuations during operation. There is a problem such that a large amount of surplus sludge occurs.

In addition, many biological processes using a combination of anaerobic, anaerobic, and aerobic tanks have been developed as advanced treatment methods.However, because of the slow growth and reaction rate of microorganisms, a large space area is required, and the response to inflow concentration changes is not flexible. There is a technical limitation that a large amount of surplus sludge occurs.

Since the 1990s, as a method for increasing the concentration of microorganisms in an aerobic tank, a method of increasing the concentration of fixed phase microorganisms using a carrier and a method of increasing the concentration of floating phase microorganisms using a bioseparation membrane has been developed, thereby improving processing efficiency and processing speed. However, the above two methods maintain high concentrations of microorganisms in an aerobic tank, and a part of maintaining high concentrations and activities of anaerobic microorganisms is not considered.

In general, the growth and reaction rate of anaerobic microorganisms is slower than that of aerobic microorganisms.

In addition, as the environmental standards for hardly decomposable substances are recently strengthened, the necessity of various technologies for efficient anaerobic operation is increasing.

It is an object of the present invention to provide an integrated upflow circulating sewage and wastewater advanced treatment apparatus capable of reducing the treatment time and sludge generation as well as high nitrogen and phosphorus treatment efficiency and a method for treating sewage and wastewater using the same. .

In order to achieve the above object, the present invention

In the upflow biological treatment device which is treated while flowing into the bottom and flows upstream,

A sewage / wastewater is introduced, and an anaerobic state is maintained to perform dephosphorization, and a biofilm tank having a biofilm carrier therein;

Oxygen-free tank is supplied with the treated water discharged from the biofilm tank, the oxygen-free state is maintained to perform the denitrification reaction; And

Treated water treated in the oxygen-free tank is introduced, the air is supplied from the outside to maintain the aerobic state to perform nitrification and organic oxidation reaction, the membrane comprises a biological separation membrane tank provided therein,

It provides an integrated upstream circulation type sewage and wastewater treatment apparatus using a biofilm and a bioseparation membrane, characterized in that the biofilm tank, anoxic tank and bioseparation membrane tank consists of one reaction tank.

In addition,

In the upflow biological treatment method in which the wastewater flows into the bottom and flows upwardly,

Introducing wastewater to be treated into a biofilm tank, and performing a dephosphorization reaction using anaerobic microorganisms attached to the biofilm carrier;

Introducing the treated water having passed through the biofilm tank into an anoxic tank to perform a denitrification reaction;

Introducing the treated water undergoing the anaerobic tank into a bioseparation membrane tank to perform nitrification and organic oxidation using aerobic microorganisms attached to the membrane; And

A part of the sludge of the bioseparation membrane tank is returned to the anoxic tank, and the remaining amount of the sludge and the treated water passing through the anoxic tank are discharged to the outside.

Provides a high sewage and wastewater treatment method comprising a.

Through the present invention, it is possible to effectively remove nitrogen and phosphorus, to reduce the amount of sludge generated and treatment time, and to minimize the land area.

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

Unlike the conventional biological advanced treatment apparatus in which the sewage / wastewater treatment system of the present invention is provided with a separator or carrier only in the aerobic tank, a separator is installed in the aerobic tank, and a biofilm carrier is provided in the anaerobic tank.

Accordingly, both aerobic and anaerobic microorganisms are activated at a high concentration to ensure stable treatment efficiency, and can significantly reduce treatment time and sludge generation. In addition, it is an upflow type biological treatment device that is processed while flowing downflow and wastewater flows to the bottom, and anaerobic tank, anoxic tank and aerobic tank are composed of one reaction tank to minimize the land area.

1 is a view showing a schematic diagram of an integrated upstream circulation type sewage and wastewater treatment system using a biofilm and a bioseparation membrane according to the present invention.

As shown in FIG. 1, the sewage and wastewater advanced treatment apparatus 100 includes a biofilm tank 101 in which sewage and wastewater are introduced and treated, and an anaerobic state is maintained to perform dephosphorization reaction; An anoxic tank 102 in which treated water discharged from the biofilm tank and conveyed sludge conveyed from the bioseparation membrane tank are supplied and treated, and an anoxic state is maintained to perform denitrification reactions; The treatment water treated in the anoxic tank is introduced, and the air is supplied from the outside to maintain an aerobic state, and includes a biological separation membrane tank 103 for nitrification and organic oxidation reaction.

In particular, the sewage and wastewater advanced treatment apparatus 100 of the present invention is provided with a biofilm carrier 111 inside the biofilm tank 101, and a separation membrane 112 is provided inside the biofilm separator tank 103. Both anaerobic microorganism of 101) and aerobic microorganism of bioseparation membrane tank 103 are maintained at high concentration.

In addition, the advanced sewage and wastewater treatment apparatus 100 of the present invention is an upflow-type biological treatment apparatus which is processed while flowing in an upstream flow of wastewater and wastewater, and the biofilm tank 101, the anaerobic tank 102, and the bioseparation membrane. The tank 103 consists of one reactor.

Figure 2 is a view showing a schematic diagram of the integrated upstream circulating sewage, wastewater advanced treatment apparatus using a biofilm and a biological separation membrane according to the present invention.

Referring to FIG. 2, the sewage and wastewater advanced treatment apparatus 500 is treated with inflow of sewage and wastewater, and an anaerobic state is maintained to perform dephosphorization, and a biofilm carrier 511 and an ORP sensor 521 are disposed therein. A biofilm tank 501 provided; The treated water discharged from the biofilm tank and the return sludge conveyed from the bioseparation membrane tank 503 are supplied and treated, and an anoxic state is maintained to perform a denitrification reaction, and the temperature sensor 522, the pH sensor 523, and the DO An oxygen-free tank 502 having a sensor 524 therein; Treated water treated in the oxygen-free tank is introduced, the air is supplied from the outside to maintain the aerobic state to perform nitrification and organic oxidation reaction, separation membrane 512, temperature sensor 525, pH sensor 526 and DO sensor 527 includes a bioseparation membrane tank 503 provided therein.

At this time, the anaerobic microorganisms inhabit a high concentration in the biofilm carrier 111 provided in the biofilm tank 101, so that the hardly decomposable substance is in contact with the anaerobic microorganisms for a long time, thereby allowing intensive treatment. As a result, the degradability of the anaerobic microorganisms to the hardly decomposable substance is enhanced, and as a result, the hardly decomposable substance is rapidly decomposed. In particular, the anaerobic microorganism is excellent in adherence rather than floating, it is possible to more efficiently maintain the anaerobic microorganism at a high concentration when using a carrier.

In addition, it is incidentally denitrification effect due to the growth of anaerobic microorganisms are induced to remove the nitrate nitrogen, organic acid is generated in the digestion process of the non-degradable organic matter can be used as an organic source of the anaerobic tank 102 is a separate nutrient source There is an advantage to reduce the input.

The biofilm carrier 111 can be both a stationary phase and a fluidized bed.

The material of the biofilm carrier 111 is not limited in the present invention, and those known in the art are used. Typically, polyvinyl chloride, polyetherene, polyether sulfone, polyfluoride vinylidene, polytetrafluoroethylene, ceramics and the like are possible.

At this time, the ORP sensor 521 provided in the biofilm tank 501 measures the oxygen acidity of the biofilm tank treated water. ORP of the biofilm tank 501 by such an ORP sensor to maintain the -50 to -400mV to obtain the optimal growth effect of anaerobic microorganisms.

In the oxygen-free tank 102, the treated water treated in the biofilm tank 101 and the return sludge returned from the bioseparation membrane tank 103 are introduced to perform denitrification by microorganisms. At this time, it is preferable that the conveying sludge pipe 113 for conveying the sludge of the bioseparation membrane tank 103 to the anoxic tank is provided. In addition, agitator (not shown) is provided inside the anoxic tank for mixing the supplied treated water and conveyed sludge.

Nitrogen nitrogen produced by nitrification of ammonia nitrogen (NH ₃ -N) in the bioseparation membrane tank 103 is introduced into the anaerobic tank 102 through the conveying sludge pipe 113. In addition, the suspended microorganisms concentrated by the bioseparation membrane 112 are supplied to the anaerobic tank 102 through a conveying pump (not shown) and the conveying sludge pipe 113 to maintain a high concentration of the microorganisms in the anoxic tank 102. .

Specifically, in the anoxic tank 102, when a microorganism decomposes an organic substance in an oxygen-free condition without molecular oxygen (free oxygen), the bound oxygen in the nitric nitrate (NO ₃ -N) molecule instead of free oxygen is used as the final electron acceptor. Nitric acid is reduced to nitrogen gas (N ₂ ) to remove nitrogen from the water, and denitrification is performed.

The anoxic bath 502 includes a temperature sensor 522 for measuring anoxic internal temperature; PH sensor 523 for sensing the pH of the anaerobic tank treatment water; And a DO sensor 524 for detecting the dissolved oxygen concentration of the anoxic tank treated water. By such a sensor, the oxygen-free tank 502 is maintained at 15 to 35 DEG C, pH 6.5 to 8.0, and dissolved oxygen at 0.5 mg / L or less.

The treated water treated in the anaerobic tank 102 flows into the bioseparation membrane tank 103, and the aerobic suspended microorganism is activated at a high concentration by the membrane 112 provided therein, thereby oxidizing organic matter, nitrifying and phosphorus excess intake. . The treated water finally treated in the bioseparation membrane tank 103 is discharged to the outside by the suction force of a suction pump (not shown).

At this time, the membrane 112 activates the aerobic microorganisms in a high concentration in a suspended state to increase the aerobic microorganism homogeneity in the bioseparation membrane tank 103, thereby quickly removing the remaining organic substances and at the same time increasing the efficiency of nitrification and excess intake efficiency of phosphorus. Can be.

Such a separation membrane is applicable to both hollow fiber membrane and flat membrane, the material is not particularly limited in its kind in the present invention. For example, polyvinyl chloride, polyetherene, polyethersulfone, polyfluoride vinylidene, polytetrafluoroethylene, ceramics, and the like are possible.

The bioseparation membrane tank 503 includes a temperature sensor 525 for measuring the temperature of the bioseparation membrane tank; PH sensor 526 for sensing the pH of the biological separation membrane treated water; And a DO sensor 527 for detecting the dissolved oxygen concentration of the biological separation membrane bath water. By such a sensor, the bioseparation membrane tank 503 is maintained at 15 to 35 ° C., pH 6.5 to 8.0, and dissolved oxygen at 0.5 mg / l or less.

In this case, the bioseparation membrane tank 503 is provided with an air injector 514, and supplies bubbles generated from the brower 532 to the bioseparation membrane tank 503. The membrane surface is automatically cleaned by the lifting force of the air bubble supplied from the air injector 514, the oxidizing power and the degassing action by the contact of the separator 512, and thus the filtration efficiency can be stably maintained as well as the life of the separator 512. Can be.

In addition, the suction pressure sensor 528 for detecting the pressure of the finally treated water from the bioseparation membrane tank 502 by the suction pump 533 and the flow rate of the treated water through the separation membrane 512 to the biofilm tank are measured. The permeation rate sensor 529 is provided to adjust the outflow amount and the membrane permeation amount of the finally treated effluent.

In particular, the present invention is a sensor that can detect the main reaction conditions are installed in the biofilm tank, anoxic tank and bioseparation membrane tank, and additionally equipped with a sensor for detecting the intake conditions of the effluent and the permeation amount of the membrane, so that the real-time analysis value is connected online By transmitting and receiving to the central control system 600 or the portable terminal 610, it is possible to implement a system that can automatically deliver the result value to the administrator.

For this purpose, an interface for monitoring and controlling the advanced sewage and wastewater treatment system can be configured by remotely transmitting and receiving sensor information.

Such an interface may be appropriately selected by one of ordinary skill in the art. For example, the interface may include an ADC module for converting a signal of each sensor from analog to digital, a DAC module for converting from digital to analog, a memory module for storing the converted sensor information, and a main controller and a peripheral device. Commander module to determine the comparison between dissolved oxygen concentration in the reaction tank, oxygen acid in solution, internal temperature, pH measurement and measured value by DIO module for operating condition monitoring and device operation The backup module for storing the information data and the display for displaying the current state can be configured in conjunction with the central processing unit 600.

The interface may be a high-speed communication network, a wireless communication, a telephone public network, etc. as a remote communication method for data transmission and reception with the main controller.

Through the advanced sewage and wastewater treatment apparatus using the biofilm carrier 111 and the membrane 112 of the present invention, nitrogen is removed through the nitrification reaction of the bioseparation membrane tank 103 and the denitrification reaction of the anoxic tank 102. Phosphorus is removed by finally discharging excess sludge through the process of accumulating in the sludge through the phosphorus release of the biofilm tank 101 and the excess phosphorus intake of the bioseparation membrane tank 103.

The advanced sewage and wastewater treatment method using the advanced sewage and wastewater treatment apparatus may include introducing wastewater to be treated into a biofilm tank and performing dephosphorization reaction using anaerobic microorganisms attached to the biofilm carrier; Introducing the treated water having passed through the biofilm tank into an anoxic tank to perform a denitrification reaction; Introducing the treated water undergoing the anaerobic tank into a bioseparation membrane tank to perform nitrification and organic oxidation using aerobic microorganisms attached to the membrane; And returning a part of the sludge of the bioseparation membrane tank to the anoxic tank, and discharging the remaining amount of the sludge and the treated water that passed through the anoxic tank to the outside.

The advanced sewage and wastewater treatment apparatus and method of the present invention are very economical and efficient because organic matter decomposition and advanced treatment are possible in a short time as compared with the conventional biological treatment apparatus and method.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are merely provided to more easily understand the present invention, and the contents of the present invention are not limited by the examples and the experimental examples.

≪ Example 1 >

In order to confirm the treatment capacity of the advanced sewage treatment system of the present invention, the process was implemented by the method shown in FIG. At this time, the carrier of the biofilm tank was filled with a ceramic carrier having a uniform size, and the separator of the biofilm separator tank was a flat membrane made of C-PVC.

Influent was applied to the sewage flowing into the sewage treatment plant in Yongin in the same manner as in this Example and Comparative Example, the operating conditions are as shown in Table 1 below.

division Residence time (hours) Dissolved Oxygen (mg / l) Sludge Transfer
(Q)
Temperature
(℃)
Anaerobic tank Anaerobic Aerobic Aerobic Anaerobic Anaerobic tank Example 1 One 1.53 3 3.5 to 4.0 0.1 or less 0.1 or less 1.5 20-25 Comparative Example 1 One 1.5 3 3.5 to 4.0 0.1 or less 0.1 or less 1.5 20-25 Comparative Example 2 2 3 6 3.5 to 4.0 0.1 or less 0.1 or less 1.5 20-25

Comparative Example 1: Bioseparation Membrane Process

Except not using a carrier in the anaerobic tank was carried out in the same manner as in Example 1, the process conditions are shown in Table 1, the specific process diagram shown in FIG.

Comparative Example 2

Comparative Example 2 was carried out by applying a conventional biological advanced treatment process. In Comparative Example 2, the biofilm and the bioseparation membrane were not used, and thus, an external precipitation tank was operated to concentrate the microorganisms. Process conditions are shown in Table 1 above and FIG. 4.

Experimental Example 1: Evaluation of Processing Capacity

The processing capacity of the processing steps of Example 1 and Comparative Examples 1 and 2 was evaluated by averaging the operation results for 3 months, and the results are shown in Table 2 below.

Processing time
(time)

Dewatering Sludge Generation (g / m ³ )

Concentration by Evaluation Item (mg / l) CODcr T-N T-P Influent Treated water Influent Treated water Influent Treated water 1 to implementation 5.5 0.1 or less 200-300 20-30 50-80 10 to 15 8-15 1-3 Comparative Example 1 5.5 0.2 ~ 0.3 200-300 20-30 50-80 20-25 8-15 2 to 4 Comparative Example 2 11.0 0.3 ~ 0.4 200-300 40-50 50-80 20-30 8-15 3 to 5

Referring to Table 2, in Example 1, the treatment time was improved by 50% or more compared with Comparative Example 2, and the amount of sludge generation was also reduced by about 50% compared with Comparative Examples 1,2. In addition, the nitrogen treatment efficiency was confirmed to improve to 40%, phosphorus treatment efficiency 30% level.

1 is a view showing a schematic diagram of an advanced sewage and wastewater treatment apparatus using a biofilm and a biological separation membrane according to the present invention.

Figure 2 is a view showing a schematic diagram of an advanced sewage and wastewater treatment apparatus using a biofilm and a biological separation membrane according to the present invention.

3 is a view showing a schematic configuration diagram of an advanced sewage and wastewater treatment apparatus of Comparative Example 1. FIG.

4 is a view showing a schematic configuration diagram of an advanced sewage and wastewater treatment apparatus of Comparative Example 2. FIG.

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

101: biofilm tank 102: anoxic tank

103: bioseparation membrane tank 111: biofilm carrier

112: separator 113: conveying sludge piping

501: biofilm tank 502: anoxic tank

503: bioseparation membrane tank 511: biofilm carrier

512: separator 513: conveying sludge piping

521: ORP sensor 522: temperature sensor

523: pH sensor 524: DO sensor

525: temperature sensor 526: pH sensor

527: DO sensor 528: suction pressure sensor

529: transmission sensor 531: conveying pump

532: Brower 600: CPU

Claims (8)

In the upflow biological treatment device which is treated while flowing into the bottom and flows upstream, A sewage / wastewater is introduced, and an anaerobic state is maintained to perform dephosphorization, and a biofilm tank having a biofilm carrier therein; Oxygen-free tank is supplied with the treated water discharged from the biofilm tank, the oxygen-free state is maintained to perform the denitrification reaction; And Treated water treated in the oxygen-free tank is introduced, the air is supplied from the outside to maintain the aerobic state to perform nitrification and organic oxidation reaction, the membrane comprises a biological separation membrane tank provided therein, An integrated upstream circulation type sewage and wastewater treatment system using a biofilm and a bioseparation membrane, wherein the biofilm tank, the anaerobic tank and the bioseparation membrane tank are composed of one reaction tank. The method of claim 1, The biofilm tank is an integrated upstream circulation type sewage and wastewater treatment apparatus, characterized in that the ORP sensor for measuring the oxygen acidity of the biofilm tank treatment water is provided. The method of claim 1, The anoxic tank may include a DO sensor for detecting a dissolved oxygen concentration of the anoxic tank treated water; A temperature sensor for measuring the temperature inside the anaerobic; And a pH sensor for sensing pH of the anoxic tank treated water. The method of claim 1, The bioseparation membrane tank is an integrated upstream circulation type sewage treatment system, characterized in that the air injector for supplying air to the bioseparation membrane tank from the outside. The method of claim 1, An integrated upflow circulation type sewage and wastewater treatment system, further comprising a conveying sludge pipe for conveying the sludge generated in the bioseparation membrane tank to an anoxic tank. The method of claim 1, The bioseparation membrane tank includes a DO sensor for detecting the dissolved oxygen concentration of the biological separation membrane treatment water; A temperature sensor for measuring a temperature inside the bioseparation membrane tank; And a pH sensor for sensing the pH of the bioseparation membrane tank treated water. The method of claim 1, Integral upflow further comprising a suction pressure sensor for detecting the pressure of the treated water treated by the bioseparation membrane tank and the flow rate sensor for measuring the flow rate of the treated water to the biofilm tank through the separation membrane Circulation type sewage and wastewater treatment system. Upflow type biological wastewater treated as wastewater flows to the bottom and flows upward In the treatment method, Sewage and wastewater to be treated are introduced into the biofilm tank and attached to the biofilm carrier. Performing a dephosphorization reaction using an established microorganism; The treated water that passed through the biofilm tank is introduced into an anaerobic tank to perform denitrification reaction. The step; The treated water passed through the anaerobic tank is introduced into the bioseparation membrane tank and attached to the separation membrane. Performing nitrification and organic oxidation using aerobic microorganisms; And A part of the sludge of the bioseparation membrane tank is returned to the anoxic tank, and the remaining amount of the sludge and the treated water passing through the anoxic tank are discharged to the outside. Sewage and wastewater advanced treatment method comprising a.

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