KR101483143B1 - Apparatus for activating microorganisms, MBR(membrane bioreactor) apparatus and MBR method using it - Google Patents

Abstract

The present invention relates to an apparatus for activating microorganisms, which is composed of an aeration tank for receiving culture water and adjusting the concentration of dissolved oxygen in the culture water to 5 mg/L or greater, a microorganism activation tank for receiving and activating facultative anaerobic microorganisms, and a pipeline part for connecting the same; to an apparatus for activating microorganisms; and to an MBR apparatus and an MBR method using the same. The apparatus for activating microorganisms supplies activated microorganisms so that facultative anaerobic microorganisms can become dominant species in a bioreactor, by only installation without modifying an existing process in a biological wastewater treatment process using the bioreactor including activated sludge, more particularly, in an MBR process. Accordingly, the biological treatment efficiency of the MBR apparatus can be enhanced with respect to change in the organic matter concentration of wastewater or environmental change in the water temperature or the like of the bioreactor.

Description

[0001] The present invention relates to an apparatus for activating microorganisms, an MBR apparatus using the same, and an MBR method,

The present invention relates to an apparatus for activating microorganisms for treating wastewater, an MBR apparatus using the apparatus, and an MBR method.

Generally, nutrient salts including nitrogen and phosphorus are present in not only organic matters as BOD components but also organic wastewater containing sewage, livestock wastewater, agricultural wastewater and industrial wastewater. This increase in nutrient salts destroys the ecosystem balance and causes the problem of eutrophication. Therefore, various biological treatment methods and devices have been developed to treat nutrients including organics, nitrogen and phosphorus.

Although the activated sludge process has been used for the biological treatment, the organic matter is suitable for the discharged water quality standard through the biological treatment, but the cost for concentrating and drying the surplus sludge is generated, and nitrogen and phosphorus Are left untreated as they are in the rivers or into the lakes and reservoirs.

MBR (Membrane Bioreactor), which utilizes a separation membrane for solid-liquid separation of activated sludge and treated water without using a sedimentation tank, is widely used, using a bioreactor including activated sludge. Compared with the activated sludge process, the MBR process has a small installation area and is easy to operate automatically, can maintain the concentration of activated sludge at a relatively high concentration, and minimizes suspended solids in the effluent treated water.

In the MBR process, when the concentration of the organic matter contained in the wastewater increases, the water temperature of the bioreactor is low, or the biological activity or concentration of the microorganism decreases during the continuous biological treatment process, the type and composition of the wastewater The environmental change of the bioreactor may change the dominant species of the microorganisms responsible for the biological treatment, thereby lowering the treatment efficiency.

In order to solve such a problem, Korean Patent No. 0445316 discloses a method in which a lid capable of opening and closing is provided in a biological reaction tank (aeration tank) in order to increase the biological treatment efficiency of wastewater, and a heating cable is wound around the periphery of the biological reaction tank, However, it is impossible to apply it to a large-sized bioreactor, and Korean Patent No. 0876322 discloses a technique for maintaining aerobic microorganisms outside the bioreactor A microorganism activating apparatus having an aerator capable of making a microorganism capable of reacting with a microorganism is disclosed. However, the microorganism activating apparatus has limitations in application to the activation of thermogenic anaerobic microorganisms such as Bacillus.

It is an object of the present invention to provide a biological wastewater treatment process using a biological reactor including activated sludge, and more particularly, to a microorganism capable of activating a tuberous anaerobic microorganism activated in a biological reactor only by additional installation, And to provide an activation device.

Another object of the present invention is to provide an MBR apparatus using the microorganism activating apparatus.

It is still another object of the present invention to provide a wastewater treatment method using the MBR device.

It is still another object of the present invention to provide a biological treatment method of wastewater using an activated sludge, wherein the microorganisms activated by the microorganism activation device are introduced into a biological reactor.

In order to achieve the above object, the present invention provides a method for producing a culture medium, comprising: a culture water inlet for introducing culture water; an air supply device for supplying outside air into the culture medium; and a culture water outlet An aeration tank having a width and height ratio of 1: 3 to 1:10; A culture water supply port communicated with the culture water outlet to receive culture water, a microorganism supply port at the upper portion, a culture water outlet at the lower portion and a stirrer in the lower portion, and a microorganism activated with a volume 5 to 20 times the volume of the aeration tank article; And a circulation pipe for returning the culture water discharged from the culture water outlet to the culture water inlet, an activated microorganism discharge pipe for discharging the culture water discharged from the culture water outlet, and a fluid flow between the transfer pipe and the culture water inlet pipe A second control valve for controlling the flow of the fluid between the transfer pipe and the microorganism discharge pipe, a culture water injection pump connected to the culture water inflow pipe, and a culture between the culture water outlet and the second control valve And a piping unit provided with a transfer pump formed in the water discharge pipe, wherein the microorganism is a tuberous anaerobic microorganism.

A microbial feed pipe connecting the microbial feed port and the return pipe, a third control valve for controlling the flow of the fluid between the feed pipe and the microbial feed pipe, and a line mixer having a microbial feed port formed in the microbial feed pipe.

The air supply device includes a ceramic-containing main body for generating far-infrared rays; A nozzle for spraying the culture water and the outside air into the main body; A blower for supplying the aerosol of the culture water and the air sprayed from the nozzle to the aerosol; And an air diffusing pipe connected to the blower and formed in the lower part of the aeration tank.

The culture water outlet of the microorganism activating tank may be formed with a water outlet protruding to the upper portion of the outlet and having at least one perforated plate formed with a plurality of water holes having a size of 5 cm or more.

Further, the present invention provides an MBR apparatus including the microorganism activating apparatus and a separator bioreactor supplied with activated microorganisms discharged from the microorganism activating apparatus.

The apparatus may further include at least one treatment tank selected from anoxic tank, anaerobic tank and aerobic tank before or after the separation membrane bioreactor.

The present invention also relates to a method for treating wastewater using a MBR apparatus, comprising the steps of: supplying a microorganism activated through the microorganism activating apparatus to a separation membrane bioreactor in a wastewater treatment method using the MBR apparatus; Provide the construction method.

The present invention also provides a method for biological treatment of wastewater using activated sludge, wherein the activated microorganisms are introduced into the biological reactor using the microorganism activating apparatus.

The microorganism activating apparatus of the present invention is a biological wastewater treatment process using a biological reactor including activated sludge. In particular, in the MBR process, the conventional anaerobic microorganism is activated By supplying microorganisms, the biological treatment efficiency of the MBR device can be increased and the surplus sludge can be reduced with respect to the environmental changes such as the change of the organic matter concentration of the wastewater and the water temperature of the biological reactor.

In addition, since the tuberous anaerobic microorganisms of the Bacillus genus that have excellent biological treatment ability are activated and put into the bioreactor, the efficiency of the treatment can be increased even if the amount of microbial input is reduced, and the effect of increasing the biological treatment efficiency by microbial input can be achieved in a relatively short time It is possible to do.

In addition, the microorganism activating apparatus of the present invention separates the aeration tank and the microorganism activating tank, which are formed long in the vertical direction, so that the dissolved oxygen is excessively increased in the aeration tank having a relatively small volume and then the overflowed microorganism activated tank, It is possible to reduce the residual chlorine in the aeration tank so that it has little influence on the growth of the microorganism and it is possible to reduce the deviation of the dissolved oxygen concentration in the microorganism activating tank and to shorten the time required for activation of the tubular anaerobic microorganism .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view of a microbial activation device according to one embodiment of the present invention; FIG.
FIG. 2 is a view showing an apparatus for activating a microorganism according to another embodiment of the present invention.
3 is a view illustrating a process flow of a wastewater treatment process using an MBR process according to an embodiment of the present invention.

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

The microorganism activating apparatus 500 according to the present invention comprises an aeration tank 100 having a width and height ratio of 1: 3 to 1:10, , A microbial activation tank 200 formed separately from the aeration tank 100 by a volume of 5 to 20 times the volume of the aeration tank 100 and activated by the introduction of the tubular anaerobic microorganisms and a piping unit 300 connecting the same .

The microorganism activating apparatus 500 preferably includes an aeration tank 100 having a dissolved oxygen concentration of 5 mg / L or more, preferably 6-20 mg / L, and a dissolved oxygen concentration of 1 to 4 mg / L, (200) having an anaerobic interval of 1.5 to 3 mg / L, the microorganisms of the Bacillus genus microorganism having the ability to proliferate and activate in a continuous anaerobic condition, It is advantageous.

Examples of the microorganism of the genus Bacillus include Bacillus subtilis, Bacillus licheniformis, Bacillus polymyxa, Bacillus magatellium and the like. The Bacillus subtilis contains protease which decomposes the protein, amylase which decomposes the starch, cellulase And so on. In addition, Bacillus licheniformis produces lipase, amylase, cellulase and the like, Bacillus polymyx produces protease, lipase, cellulase and the like, and Bacillus magatarium produces protease, cellulase and the like.

Distilled water is most suitable for the culture water initially supplied to the aeration tank 100, but groundwater or tap water is used because it requires a separate distilled water production facility and cost. In the case of tap water, the residual chlorine concentration standard is 4 mg / L and is usually controlled at 0.2 to 0.4 mg / L to inhibit the growth of microorganisms. Therefore, in order to use tap water as a direct culture water, it is necessary to provide a distilled water production facility or a large water tank to lower the residual chlorine concentration. However, in the present invention, residual chlorine of tap water, The water can be supplied to the microorganism activating tank 200 and reduced to 1/4 or less. Therefore, the tap water can be directly used as the culture water.

In addition, the cultivation water may be a wastewater treatment water having a water content equal to or less than the waste water treatment standard of the sewage treatment plant, particularly 5 mg / L or less of the suspended substance, and the wastewater treatment water may be treated with membrane, activated carbon or reverse osmosis.

The cultured water should be at a pH of 6 to 8 and a chlorine concentration of 0.1 mg / L or less when supplied to the microorganism activating tank 200, but may be allowed to have a salt concentration of 1.5 mg / L or less.

In the present invention, since the aeration tank 100 and the microbial activation tank 200 are separated from each other, the blowing speed of the blower of the aeration tank and the air supply pressure are maximized to increase the dissolved oxygen concentration in the aeration tank efficiently, Since the ratio of the width to the height is long in the vertical direction of 1: 3 to 1:10, preferably 1: 5 to 1: 8, the bubbles rise and mix in the aeration tank, and the dissolved oxygen concentration of the culture water becomes uniform And the culture water in which the dissolved oxygen concentration is increased flows over the microbial activation tank 200 through the culture water outlet 130 and the culture water supply port 210. When the ratio of the height to the width of the aeration tank 100 is less than the lower limit value, the bubbles are difficult to be uniformly mixed while rising, and when the ratio of the height to the width exceeds the upper limit value, the bubbles rise and aggregate, So that the solubility of oxygen is reduced.

The volume of the microorganism activating tank 200 is preferably 5 to 20 times, preferably 7 to 15 times the volume of the aeration tank 100. When the volume of the microorganism activating tank 200 is less than the lower limit value or exceeds the upper limit value, the culture water of the absolute breath interval overflowing from the aeration tank 100 with a dissolved oxygen concentration of 5 mg / L or more is difficult to be controlled into the tubular anaerobic section. Also, when the volume of the microorganism activating tank 200 is less than the lower limit value, the treatment capacity of the microorganism activating apparatus 500 is lowered.

When the air supply device is directly provided in the microorganism activating tank to control the concentration of the dissolved oxygen in the tubular anaerobic section by lowering the blowing speed of the blower or the air supply pressure in the air supply device in the microorganism activating tank, The rate of dissolution of air in the microorganism activated tank is lower than that in the case of increasing the speed or the air supply pressure and it becomes difficult to uniformly mix the microorganisms at different positions. Therefore, the proliferation and activation of the thermogenic anaerobic microorganism, It can be difficult.

1, the apparatus 500 for activating a microorganism according to an embodiment of the present invention includes a culture water inlet 110 for introducing culture water, an air supply device 120 for supplying outside air into the inside thereof, An aeration tank 100 having a culture water outlet 130 at an upper portion thereof and having a width and a height of 1: 3 to 1:10 so as to be overflowed with an increased amount of culture water overflowed; A culture water supply port 210 communicating with the culture water outlet 130 to supply culture water, a microorganism supply port 220 at an upper portion thereof, a culture water outlet port 240 at a lower portion thereof, and an agitator 230 therein A microbial activated tank 200 having a volume 5 to 20 times the volume of the aeration tank 100; A transport pipe 311 for transporting the culture water discharged from the culture water outlet 240 to the culture water inlet 110 and an activated microorganism discharge pipe 312 for discharging the culture water discharged from the culture water outlet 240 A first control valve 322 for controlling the flow of the fluid between the transfer piping 311 and the culture water inflow pipe 313 and a control valve 322 for controlling the flow of the fluid between the transfer piping 311 and the microorganism discharge pipe 312 A culture water infusion pump 331 connected to the culture water inflow pipe 313 and a culture water discharge pipe 314 between the culture water discharge port 240 and the second control valve 321. The second control valve 321, And a piping unit 300 provided with a transfer pump 332 formed in the piping 300.

The microorganism supply port 220 is supplied with a tubular anaerobic microorganism having excellent organic decomposition ability. The microorganisms are preferably granules rather than powders, and they may be directly injected into the microorganisms, but they may be blown in the wind. Therefore, the microorganisms may be soaked in the culture water or paste or slurry may be prepared. Since the microorganisms in the form of powder or granules require excipients for pulverization or granulation, it is preferable to mix them with a carbohydrate source, a protein source, an inorganic source and vitamins, which are nutrient sources of microorganisms. In addition, since the amount of microorganisms to be input is very small compared with the volume of the microorganism activating tank 200, the line mixer 221 as shown in FIG. 2 can be provided for rapid and uniform mixing of the microorganisms.

When the line mixer 221 is installed, the microbial supply pipe 315 connecting the microbial supply port 220 and the transfer pipe 311 and the fluid flow between the transfer pipe 311 and the microbial supply pipe 315 And a line mixer 221 having a microorganism input port 222 is installed in the microorganism feed pipe 315. The third control valve 323 controls the microbial feed pipe 313,

The air supply device 120 includes a ceramic-containing main body 121 for generating far-infrared rays as shown in FIG. 2; A nozzle 122 for spraying the culture water and the outside air into the main body; A blower 123 for supplying the aerosols of the culture water and the air sprayed from the nozzles to the aerosol; And a diffuser 123 connected to the blower and formed in the lower portion of the aeration tank.

The ceramic may be a quartz, a rock, a biotite, or the like that emits far-infrared rays. In the ceramic-containing body 121, the culture water and the external air are sprayed to increase the activity of the water molecule to improve the biological water treatment efficiency. Thereby increasing the dissolved oxygen concentration and the chlorine removal efficiency in the aeration tank 100.

The culture water outlet 240 of the microorganism activating tank 100 is formed with a water pipe 270 having one or more perforated plates protruding upward from the outlet and having a number of water holes of 5 cm or more in size . The water passage is, for example, a three-dimensional structure in the form of a semicircle, a pyramid, and a ladder horn, and the three-dimensional surface is made of a perforated plate, and the water passage hole has a size of about 5 cm or more, preferably about 6 to 10 cm, The lumps are sucked into the water passage and crushed while preventing the clogging of the culture water outlet 240 due to the accumulation of microbial powders or lumps of particles.

Although the aeration tank 100 and the microorganism activating tank 200 are shown in a sealed tank form in FIGS. 1 and 2, a structure in which the upper part is opened is also possible. In the case of a tank type in which the upper part is hermetically closed, a lid may be provided on the upper part, and a pressure regulating valve 250 may be provided or a pressure regulating valve 324 may be provided for regulating the pressure of the tank.

The aeration tank 100 and the microorganism activation tank 200 may be provided with a heating unit for controlling the temperature of the culture water. The heating unit may adjust the temperature by heating in the form of a jacket or a heating pipe 260 installed therein.

The aeration tank 100 and the microorganism activating tank 200 may be provided with a measuring device for measuring temperature, dissolved oxygen concentration, pH, and the like.

The method for activating a microorganism using the microorganism activating apparatus (500) of the present invention includes a step of aeration water aeration, a step of supplying a microorganism, a step of activating a microorganism, a step of supplying an activated microorganism, and a step of circulating washing.

First, in the culture water aeration step, the transfer pipe valve of the first control valve 322 is closed, the culture water inflow pipe valve is opened, the culture water infusion pump 331 is operated to supply the culture water to the aeration tank 100, The air supply device 120 is operated to increase the dissolved oxygen concentration of the culture water in the aeration tank 100 to 5 mg / L or more, and the culture water is discharged to the culture water outlet 130 above the aeration tank 100.

When the aeration tank 100 is provided with the air supply device 120 as shown in FIG. 2, the culture water and the outside air are sprayed through the nozzle 122 into the ceramic containing body 121, 122 and aerosol of the air can be supplied to the aeration tank 100 of the culture water aeration step through the aeration tube 124 formed below the aeration tank 100 by the blower 123.

Next, the microorganism supplying step and the microorganism activating step are different when the line mixer 221 is provided or not.

In the case where the microbial feeder 220 is not provided with a line mixer, the microorganism supply step stops the transfer pump 332 and the culture water discharged from the culture water outlet 130 flows into the culture water supply port 210, Is supplied to the microorganism activating tank 200 through the microorganism supply port 220, and microorganisms are supplied through the microorganism supply port 220, and the stirrer 230 is rotated.

In the case where a microbial feeder 220 is not provided and a line mixer is not provided, the microbial activation step may include a step of activating the microorganism activating tank 200 by supplying a culture water of a predetermined height, for example, from the culture water supply port 210 to the culture water outlet 240 Of the height of the second control valve 321 exceeds the height corresponding to 70 to 90% of the height of the second control valve 321, the transport pump 332 is operated to stop the culture water infusion pump 331, The circulation piping valve is opened, the culture water inflow pipe valve of the first control valve 322 is closed, the transfer piping valve is opened, and the culture water of the microbial activation tank 200 is circulated to the aeration tank 100 . At this time, the air supply device 120 of the aeration tank 100 stops the operation when the dissolved oxygen concentration of the microbial activated tank 200 exceeds the upper limit value of the hydrothermal anaerobic section. If the dissolved oxygen concentration of the microbial activated tank 200 becomes less than the lower limit value, 200) and activates the microorganisms for 30 minutes to 5 hours, preferably 40 minutes to 2 hours, at the optimum dissolved oxygen concentration, temperature and pH necessary for the proliferation and activation of the tuber-anaerobic microorganism.

In the case where the line mixer 221 is provided, the microorganism supply step stops the transfer pump 332 and stops the flow of the culture water discharged from the culture water outlet 130 through the culture water supply port 210 to the microbial activation tank 200 And the culture water of the microorganism activating tank 200 is supplied to the culture water discharge port 240 at a predetermined height, for example, more than 10 to 40% of the height from the culture water supply port 210 to the culture water discharge port 240 The microbial feed pipe valve of the third control valve 323 is closed and the microbial feed pipe valve of the third control valve 323 is opened and microorganisms are introduced into the microbial inlet 222 of the line mixer 221.

At the same time during the microbial supply step, the culture water flows into the aeration tank 100 and the culture water aeration step is continued, so that the water level of the microbial activation tank 200 gradually increases.

When the introduction of the microorganisms through the line mixer 221 is completed, the microorganism activating step stops the transfer pump 332, opens the transfer pipe valve of the third control valve 323, closes the microorganism feed pipe valve, The culture water is continuously supplied to the microorganism activating tank 200 through the sphere 210 so that the culture water corresponds to 70 to 90% of the height from the culture water supply port 210 to the culture water discharge port 240 at a predetermined height, The microbial discharge pipe valve of the second control valve 321 is closed and the transfer piping valve is opened and the microbial discharge pipe valve of the second control valve 321 is closed, The control valve 322 closes the culture water inlet pipe valve and opens the transfer pipe valve to circulate the culture water of the microbial activation tank 200 to the aeration tank 100. At this time, the dissolved oxygen concentration of the microbial activation tank 200 is regulated by repeating the interruption and operation of the air supply device 120 of the aeration tank 100.

Next, the activated microorganism discharging step is a step of discharging the activated microorganism through the microorganism discharging pipe 312 by opening the microorganism discharging pipe valve of the second control valve 321 and closing the return piping valve when the microorganism of the microorganism activating tank 200 is activated, .

Next, the circulating washing step may be performed at a height corresponding to 10 to 30% of the height of the culture water of the microorganism activating tank 200 from a predetermined height, for example, from the culture water supply port 210 to the culture water discharge port 240 If exceeded, the culture water aeration step, the microorganism supplying step, the microorganism activating step and the activating microorganism discharging step are repeated. On the other hand, if it is not necessary to further supply the activated microorganisms, the transfer pump 332 is stopped after the culture water aeration step, and the culture water discharged from the culture water outlet 130 flows through the culture water supply port 210, When the culture water in the microorganism activating tank 200 exceeds a predetermined height, for example, 20 to 100 cm from the culture water outlet 270, the feed pump 332 is operated, The microorganism discharge pipe valve of the second control valve 321 is closed, the transfer pipe valve is opened, the culture water inlet pipe valve of the first control valve 322 is closed, The piping valve is opened to circulate the culture water of the microbial activation tank 200 to the aeration tank 100 to clean the aeration tank 100, the microorganism activation tank 200 and the piping unit 300. At this time, the air supply device 120 of the aeration tank 100 and the stirrer 230 of the microorganism activation tank 200 may be operated or stopped as needed.

The MBR apparatus of the present invention includes the microbial activation device 500 and the separation membrane bioreactor 400 to which the activated microorganisms discharged from the microbial activation device 500 are supplied. In the MBR method of the present invention, in the wastewater treatment method using the MBR device, the activated microorganisms are supplied to the separation membrane bioreactor.

The separation membrane bioreactor 400 may further include at least one treatment tank selected from the anoxic tank, the anaerobic tank, and the aerobic tank.

3 shows a process flow of a wastewater treatment process according to an embodiment of the present invention in which the microorganism activation device 500 is provided in an MBR device 400 having an anoxic tank 402 and a separation membrane bioreactor 401 .

In the anoxic tank 402, the wastewater and the activated sludge, which are influent water, are stirred by an agitator M so that the biologically active sludge feeds on the organic substances present in the wastewater or wastewater to remove the organic matter. Denitrification is carried out by nitrifying the activated nitrified activated sludge under anoxic condition to release nitrogen gas into the atmosphere.

The separation membrane bioreactor (401) also nitrifies the ammonia nitrogen and the activated sludge of the influent water flowing in the anoxic tank (402).

The nitrified inflow water and the activated sludge pass through the immersion separation membrane and the treated water that has passed through the separation membrane is discharged to the treatment water tank 404 and some of the activated sludge that has not passed through the separation membrane passes through the anoxic tank 402 And the other part is discharged to the outside along the activated sludge discharge passage.

The microorganisms activated in the microorganism activating apparatus 500 are supplied to the separation membrane bioreactor 401 to accelerate the decomposition of the organic matter in the MBR process, increase the nitrogen and phosphorus removal efficiency, In the case of microorganisms of the genus Bacillus, when the nutrient source is insufficient, spores are formed, thereby increasing the dehydration efficiency of sludge and reducing the amount of sludge generated.

Membranes provided in the separation membrane bioreactor 401 may be one or more selected from a flat membrane, a hollow fiber membrane and a tubular membrane depending on the type thereof. The membrane pore size includes cartridge filters, MF (microfiltration), and UF Ultrafiltration) may be used alone or in combination.

The separation membrane tank 401 supplies air through an air diffuser to maintain the aerobic state. Generally, the concentration of dissolved oxygen is adjusted in the range of 1 to 3 mg / L to form stirring and water flow, It is possible to prevent the phenomenon that the membrane is clogged by washing.

In the treatment water tank, the treated water having passed through the separation membrane is introduced into the separation membrane bioreactor (401), and treated to store and discharge the treated water.

The microorganism activating apparatus 500 is applicable not only to the separation membrane bioreactor 401 but also to a biological treatment method including activated sludge process such as a conventional activated sludge process or an advanced treatment process of A 2 O and A / .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

Examples 1 to 2 and Comparative Examples 1 to 2

(MBR) apparatus equipped with an anoxic tank and a membrane bioreactor were treated according to the conditions shown in Tables 1 and 2 below, based on 400 L / day of wastewater. The total volume of activated sludge in the membrane bioreactor is 126 L.

The respective volumes contained in the anoxic tank and the membrane bioreactor of the MBR apparatus were 44 L and 82 L, respectively.

In addition, a fan having a blower capacity of 40 Wh and an air volume of 40 L / min was used, and when the blowing amount was required, the blowing amount was adjusted using an inverter.

In addition, the pH of the wastewater fed into the anoxic tank was 7.0 to 7.5. Also, the membrane MF used in the separation membrane bath was a separation membrane having a pore size of 0.1-0.4 mu m manufactured by Yuasa.

Example 1 is an apparatus for activating the microorganism of FIG. 1, which comprises an aeration tank 100 having a width to height ratio of 1: 5 and a volume of 3 m ³ and a microorganism activating tank 200 having a volume of 35 m ³ , And the residence time of the culture water in the aeration tank 100 was adjusted to 5 minutes, and the culture water was supplied to the microbial activated tank 200 with a particle size of about 1 cm to obtain a Bacillus microorganism granule (Aquatic 3 parts by weight of BioScience, 4 x 10 ⁹ CFU / gram) was added to each 100 parts by weight of the culture water for 15 minutes in small amounts, and the culture water outlet 240 ), The inflow of the culture water is stopped, and the temperature of the microorganism activating tank 200 is maintained at 25 DEG C while the rotation speed of the agitator is circulated at 180 rpm and the microorganism is circulated at a rotation speed of 180 rpm. After activation for 1 hour, 3 L was added to the membrane bioreactor.

Example 2 was used in the same manner as in Example 1 except that the microorganism activating device used in Example 1 was used with an air supply device having a ceramic-containing main body and a nozzle for generating far infrared rays of FIG. 2, and the microorganisms were activated.

Comparative Example 1 is a microbial activation device in which an aeration tank and a microbial activated tank are not separated from each other. In a culture tank equipped with an aeration tube, the dissolved oxygen concentration is maintained at 6 mg / 3 parts by weight of the microorganism granules of the Bacillus subtilis were added and the microorganisms were activated for 1 hour.

In Comparative Example 2, the microorganism granules of the genus Bacillus were directly introduced into a membrane bioreactor without using a microorganism activating device.

In Comparative Example 3, the above-mentioned Bacillus subtilis microorganism granule or a microorganism having the activated Bacillus subtilis microorganism was not added to the separation membrane bioreactor.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Characteristic Activated microorganism input Activation of far-infrared activated microorganisms Activated microorganism input without aeration tank Microbial input without activation No microbial inputs Influent flux() 400 400 400 400 400 Anoxic tank MLSS concentration (/) 2970 2690 4250 4960 5980 Internal Bounce Rate (%) 200 200 200 200 200 Stirring speed (RPM) 180 180 180 180 180 DO (/) 0.00 0.00 0.00 0.00 0.00 ORP (mmV) -189 -202 -197 -188 -188 Volume (L) 44 44 44 44 44 Retention time (hr) 2.64 2.64 2.64 2.64 2.64 Activation condition density(%) 3.0 3.0 3.0 3.0 - DO (/) 2.0 2.0 2.0 - - pH 7.12 7.05 7.23 - - Retention time (hr) One One One - - Temperature() 23 23 23 - - Membrane bioreactor MLSS concentration (/) 3690 3350 5220 5830 6980 pH 6.89 6.84 6.91 6.86 6.88 DO (/) 2.3 2.6 2.3 2.5 2.5 Volume (L) 82 82 82 82 82 Retention time (hr) 4.92 4.92 4.92 4.92 4.92 Membrane type Flat membrane (MF) Flat membrane (MF) Flat membrane (MF) Flat membrane (MF) Flat membrane (MF) Total residence time (hr) 7.56 7.56 7.56 7.56 7.56 F / M ratio (kg-BOD / kg- MLSS.day) 0.208 0.238 0.144 0.130 0.105 SRT (day) 20 20 20 20 20

The F / M ratio is the ratio of microorganism to the incoming food. In Examples 1 and 2, since the microorganisms in the microorganism activated tank are activated and activated, the content of the activated sludge is decreased The F / M ratio was increased.

The SRT refers to the sludge retention time in the biological reactor. The SRT maintains a certain amount of sludge in the biological reactor by controlling the amount of sludge to be discharged to the sludge produced in the biological reactor by the inflow of sewage. The examples were adjusted to equal the SRT for 20 days to obtain the amount of excess sludge. When the concentration of activated sludge is low, the concentration of excess sludge also decreases in the same SRT.

The reason why the concentrations of the anoxic tank and the membrane filter MLSS are not similar between the examples and the comparative examples and is different from that of the comparative example 3 is that the lack thereof is due to the action of the activated Bacillus microorganisms, Were the most abundant and vigorous when Bacillus sp.

Experimental Example 1

Table 2 shows the BOD, COD, SS, T-N, T-P and total coliform counts for the above examples and comparative examples, and the amount of excess sludge and the sludge reduction rate are shown in Table 3.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Influent
(Mg / l) Treated water
(Mg / l) Treatment efficiency (%) Influent
(Mg / l) Treated water
(Mg / l) Treatment efficiency (%) Influent
(Mg / l) Treated water
(Mg / l) Treatment efficiency (%) Influent
(Mg / l) Treated water
(Mg / l) Treatment efficiency (%) Influent
(Mg / l) Treated water
(Mg / l) Treatment efficiency (%) BOD 225.0 1.8 99.2 234.2 1.7 99.3 221.9 2.2 99.0 225.5 2.5 98.9 219.4 2.8 98.7 COD 171.0 5.5 96.8 178.1 5.1 97.1 167.0  6.8 95.9 175.6 7.7 95.6 168.7 8.5 95.0 SS 239.0 1.3 99.5 255.0 1.2 99.5 231.0 1.6 99.3 242.0 1.8 99.3 224.0 2.0 99.1 T-N 41.167 6.665 83.8 46.187 6.152 86.7 41.628  8.203 80.3 42.350 9.229 78.2 39.845 10.254 74.3 T-P 4.527 0.733 83.8 4.924 0.676 86.3 4.274  0.902 78.9 4.470  1.014 77.3 4.154 1.127 72.9 Total coliform count
(Dogs / ml) TNTC <30 - TNTC <30 - TNTC <30 - TNTC <30 - TNTC <30 -

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Surplus sludge generation (L / day) 6.0 6.0 6.0 6.0 6.0 Surplus sludge concentration (mg / l) 3690 3350 5220 5830 6980 Surplus sludge load (g / day) 22.1 20.1 31.3 35.0 41.9 Surplus Sludge Waste Reduction (%) 47.1 52.0 25.2 16.5 0

When the same SRT was applied to maintain a constant activated sludge concentration in the biological reactor in accordance with the F / M ratio, the excess sludge generation amount was the same, but the concentration and loading amount of the excess sludge decreased in the examples, Sludge of 47.1 to 52% was saved.

100: aeration tank 110: culture water inlet
120: air supply device 121: ceramics containing body
122: nozzle 123: blower
124: Acid column 130: Culture water outlet
200: microorganism activation tank 210: culture water feed port
220: microorganism supply port 221: line mixer
222: Microorganism input port 230: Stirrer
240: Culture water outlet 250: Pressure regulator
260: heating tube 270:
300: piping section 311: return piping
312: activated microorganism discharge pipe 313: culture water inlet pipe
314: Culture water discharge pipe 315: Microorganism supply pipe
321: second control valve 322: first control valve
323: third control valve 331: culture water injection pump
332: Return pump 400: MBR device
401: Separation membrane bioreactor 402: Anoxic tank

Claims (7)

A culture water inlet for introducing the culture water, an air supply device for supplying the outside air into the inside, and a culture water outlet at the upper part so as to overflow the culture water with the increased dissolved oxygen, : 3 to 1:10;
A culture water supply port communicated with the culture water outlet to receive culture water, a microorganism supply port at the upper portion, a culture water outlet at the lower portion and a stirrer in the lower portion, and a microorganism activated with a volume 5 to 20 times the volume of the aeration tank article; And
A transport pipe for transporting the culture water discharged from the culture water discharge port to the culture water inlet port, an activated microorganism discharge pipe for discharging the culture water discharged from the culture water discharge port, a flow control valve for controlling the flow of fluid between the transfer pipe and the culture water inlet pipe A second control valve for controlling the flow of the fluid between the transfer pipe and the microorganism discharge pipe, a culture water infusion pump connected to the culture water inflow pipe, and a culture water inlet port connected to the culture water outlet and the second control valve And a piping unit provided with a transfer pump formed in the discharge pipe,
The microorganism is a tuberous anaerobic microorganism,
Wherein the culture water outlet of the microorganism activating tank is formed with a water outlet protruding to the upper portion of the outlet and having at least one perforated plate formed with a number of water holes having a size of 5 cm or more. The microorganism feeding device according to claim 1, further comprising: a microbial feed pipe connecting the microbial feed port and the return pipe; a third control valve controlling the flow of fluid between the feed pipe and the microbial feed pipe; and a line mixer having a microbial feed port formed in the microbial feed pipe Wherein the microorganism activating apparatus comprises: The air conditioner according to claim 1 or 2, wherein the air supply device comprises a ceramic containing main body for generating far-infrared rays; A nozzle for spraying the culture water and the outside air into the main body; A blower for supplying the aerosol of the culture water and the air sprayed from the nozzle to the aerosol; And an oxidant pipe connected to the blower and formed in the lower part of the aeration tank. delete A MBR device comprising a microorganism activating device according to claim 1 or 2 and a separator bioreactor supplied with activated microorganisms discharged from the microbial activation device. The method for treating wastewater using an MBR apparatus according to claim 5, wherein the microorganisms activated through the microorganism activating device are supplied to the membrane bioreactor in the wastewater treatment method using the MBR device. delete

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