KR101679603B1 - Water treatment apparatus using cleaning powder and submersed membranes module - Google Patents

Abstract

The present invention relates to an apparatus for treating sewage water, graywater and supply water by using cleaning powder and a submerged membrane module. The apparatus for treating sewage water, graywater and supply water according to the present invention comprises: an anoxic tank which removes nitrogen from sewage or graywater, and which also removes organic materials; an anaerobic tank into which the sewage or graywater is introduced from the anoxic tank, and which decomposes organic materials in the sewage or graywater, and which discharges phosphorus; an aerobic tank which removes phosphorus from the sewage or graywater introduced from the anaerobic tank, which converts an ammoniac nitrogen component into outflow water in a nitrate nitrogen state, and which oxidizes and decomposes organic materials by using aerobic microorganisms; a submerged membrane tank in which a submerged membrane module configured to filter out impurities in a mixture introduced from a circulation water tank is disposed therein, and which discharges treated water obtained via the submerged membrane module; a precipitation tank which transfers or discharges materials of high specific gravity, contained in the outflow water introduced from the aerobic tank, as sludge, and which transfers residuals to the circulation water tank; and the circulation water tank which inputs a mixture, obtained by mixing the water, transferred from the precipitation tank, with cleaning powder, into the submerged membrane tank.

Description

[0001] The present invention relates to a water treatment apparatus using a cleaning powder and a submersed membrane module,

The present invention relates to a device for treating domestic sewage, industrial wastewater, and water, and more particularly, to a method of treating wastewater, industrial wastewater, and water by treating the interior of a submerged separation membrane tank with a cleaning powder to adsorb pollutants contained in sewage, And to provide a water treatment apparatus using the washing powder and the submerged membrane module capable of contributing to the supply of clean water resources.

In general, the membrane is a porous membrane for separating the solution and the solute. It is widely used in various water treatment apparatuses such as a pure water producing apparatus, a water tapping apparatus, and a wastewater treatment apparatus. Depending on the shape of the membrane module, a plate, tubular, spiral wound type, and the like, and are classified into an external type (case hydraulic type) provided on the outside of the reaction tank and an immersion type provided in the reaction tank according to the method of use.

Here, the submerged separation membrane is a method in which a plurality of plate-type or hollow-fiber separation membrane modules are fixed to a frame, installed in a reaction tank, and then raw water outside the separation membrane is drawn into the membrane and filtered.

Such a submerged membrane should be periodically replaced or cleaned since the membrane surface is contaminated with the passage of time.

In such a water treatment apparatus, the submerged membrane, which is one of the important means, is introduced into the aerobic tank by the separation membrane, sucked only by the treated water by the submerged membrane, and then passed to the final discharge or the next process.

However, since the aerobic tank contains microorganism masses and organic and inorganic substances, the submerged membrane is often clogged. Therefore, the membrane should be regularly or irregularly cleaned occasionally. Hereinafter, a detailed description will be made with reference to the drawings.

As shown in FIG. 1, the conventional apparatus includes a flow rate regulator 110 for regulating the flow rate of raw water (heavy or sewage), and an agitator for removing organic matter from the raw water and denitrifying the nitrified nitrate nitrogen And an ammonia nitrogen (NH 3 -N) in the raw water is oxidized by the microorganisms after oxidizing the remaining organic matter by the microorganisms in the aerobic state by flowing the treated water into the anoxic tank (120) NO3-N), a storage tank 140 into which surplus sludge is introduced from the oxic tank 130, and a washing water tank 150 in which wash water for washing the immersion type separator unit 160, which will be described later, .

The converted nitrate nitrogen flows into the anoxic tank 120 again and is released into the atmosphere by nitrogen (N2) gas by the denitrification reaction to remove nitrogen.

In the aerobic tank 130, a submerged separation membrane unit 160 is submerged. Foreign matter or the like is caught by the submerged separation membrane unit 160, so that only clean treated water is sucked and then introduced into the downstream process or finally discharged.

Since the aerobic tank 130 contains microbial masses and organic and inorganic substances, the submerged separation membrane of the submerged separation membrane unit 160 is closed. If the microorganism mass is not cleaned, clean treatment water can not be sucked, and thus the submerged separation membrane can be regularly or irregularly .

In the cleaning method of the submerged separation membrane unit 160, the submerged separation membrane unit 160 is lifted in the water of the aerobic tank 130 and immersed in a separate water bath 150 for cleaning, It is necessary to separately provide a cleaning solution. If the cleaning solution is salvaged, there is a problem that waste of manpower and damages and breakage of the immersion type separation membrane occur.

Korean Patent Publication No. 2005-0063478 Korean Patent Registration No. 10-1494398

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a method for preparing a mixture of a water- The present invention relates to a water treatment apparatus using a washing powder and a submerged membrane module for adsorbing contaminants contained therein and retarding the phenomenon that a foreign substance or the like adheres to and propagates on the surface of a submerged membrane.

In order to achieve the above object, the present invention provides an anoxic tank for denitrifying nitrogen contained in heavy water and sewage, an anaerobic tank for removing organic matter in sewage, and an anaerobic tank for decomposing organic matter in the sewage, An oxic tank for removing phosphorus from the sewage introduced from the anaerobic tank and converting the nitrogen component in ammonia nitrogen form into effluent in a nitrate nitrogen state and oxidizing and decomposing organic matter with aerobic microorganisms and an effluent from the oxic tank, A submerged membrane module for discharging the treated water treated through the submerged membrane module, a sedimentation tank for conveying or discharging a part of the effluent flowing from the aerobic tank to the sludge and transferring the remaining water to the circulation water tank, The treatment water discharged from the submerged membrane And a circulation water tank for mixing the purified powder and putting it into the submerged separation membrane bath.

In addition, a coagulant is injected into the water to react with the coagulant to form a flocculated liquid. The coagulant is fed with the sludge. The coagulant coagulates and cools the coagulant and the sludge transferred from the coagulant. A sedimentation tank for transferring the concentrated liquid or sludge having a high specific gravity to the sludge and a small specific gravity for transferring the effluent to the circulation water tank and a circulation water tank for introducing a mixture of the washing powder into the sludge discharged from the sedimentation tank into the submerged separation membrane tank And an immersion type membrane module for removing foreign substances from the effluent introduced from the circulation water tank, and an immersion type membrane tank for discharging the treated water treated through the immersion type membrane.

In addition, since most of the solid material is precipitated in the settling tank, when a liquid is introduced into the circulating water tank, a solid material having a constant concentration capable of washing the foreign substances adhering to the surface of the separation membrane is required. And the washing powder is injected in order to smooth the cleaning of the surface of the separation membrane.

The cleaning tank may further include a cleaning tank connected to the submerged membrane separator and storing wash water for cleaning the submerged separator membrane.

Also, the cleaning powder is a powder mixed with a substance having an adsorbing component and a natural mineral.

The submerged separation membrane is a plate-like or hollow-tube type separation membrane.

In addition, the submerged membrane module may include a support member that is hermetically fixed and supported at a lower end thereof, and a connection member that is connected to the suction pump at an upper portion of the membrane filter, .

The mixing ratio of the washing powder is 10 to 100 parts by weight based on 100 parts by weight of the powder having adsorption properties.

Furthermore, the size of the separation membrane filter pores is 0.02 mu m to 0.2 mu m or less.

The water treatment apparatus provided with the washing powder and the immersion type membrane module according to the present invention has the effect of injecting the washing powder into the circulation water tank and injecting the washing powder into the immersion type membrane tank to adsorb foreign matter on the surface of the immersion type membrane module and clean it cleanly.

In addition, since the cleaning powder is supplied, the surface of the submerged membrane module is cleaned, and the residual contaminants present in the sewage, heavy water, and water are also adsorbed, so that the water, water, and sewage can be treated more cleanly .

1 is a schematic view showing a conventional heavy water or sewage treatment apparatus;
2 is a view showing a heavy water and wastewater treatment apparatus using the immersion type membrane module according to the present invention.
3 is a view showing a water treatment apparatus using an immersion type membrane module according to the present invention.

Hereinafter, a water treatment apparatus using the washing powder and the submerged membrane module of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a view showing a heavy water and wastewater treatment apparatus of a submerged separation membrane module using a cleaning powder according to the present invention, and FIG. 3 is a view showing a water treatment apparatus of a submerged separation membrane module using a cleaning powder according to the present invention.

As shown in FIG. 2, in the water treatment apparatus using the washing powder and the submerged membrane module,

The sewage and heavy water treatment apparatus includes an anoxic tank 200 for denitrifying nitrogen contained in sewage or heavy water and removing organic matter,

An anaerobic tank 300 through which organic matter is removed from the anoxic tank 200 to decompose the organic matter of the sewage or heavy water and releases phosphorus,

An aerobic tank 400 for converting sewage or heavy water discharged from the anaerobic tank 300 into an effluent having an ammonia-rich small nitrogen component and an oxidizing aerobic microorganism into an organic matter,

A sedimentation tank 500 for conveying or discharging high-specific gravity to the sludge among the effluent flowing from the oxic tank 400 and transferring the remainder to the circulation water tank 600,

A circulation water tank 600 which mixes the mixture of the washing powder 620 with the effluent water sent from the settling tank 500 into the submerged membrane separation tank 700,

An immersion type membrane module 710 for filtering the foreign substances of the effluent introduced from the circulation water tank 600 and an immersion type membrane chamber 700 for discharging the treated water through the immersion type membrane module 710 And the like.

Hereinafter, each component of the sewage, heavy water, and water treatment apparatus using the washing powder and the submerged membrane module according to the present invention will be described.

1. Anoxic tank (200)

Sewage water flowing through a pump (not shown) of a flow rate adjusting tank (not shown) flows into the lower portion of the anoxic tank 200 and is mixed with the sludge. In addition, a part of the sludge is joined to the sludge through a pump (not shown) in the oxic tank 400 and discharged to the excess sludge through the sludge return line L.

The main function of the anoxic tank 200 is to treat nitrogen by the denitrification mechanism of the carbon source sewage supply through buffering the impact load of the sewage water quality and returning the nitrification liquid of the oxic tank 400. Denitrification refers to the reduction of nitrate nitrogen to nitrogen gas by microorganisms. The denitrification effect is that microorganisms use oxygen contained in nitrate nitrogen if oxygen is insufficient, so nitrate nitrogen loses oxygen and is reduced to nitrogen gas and released into the atmosphere. In the anoxic tank 200, a speed adjustable stirrer 210 may be installed, and a pH adjuster such as sodium hydroxide (NaOH) or sulfuric acid (H ₂ SO ₄ ) may be added to adjust the pH.

2. The anaerobic tank (300)

The effluent (sewage) flowing from the anoxic tank 200 flows into the anaerobic tank 300 using a pump (not shown) and is mixed with the sludge. A second agitator 310 is installed in the anaerobic tank 300 to increase the contact efficiency between the anaerobic microorganism and the substrate to be degraded. The inflowing sewage can be divided into the anoxic tank 200 and the anaerobic tank 300 at a ratio of 7: 3 or 8: 2.

The main function is to decompose organic matter in sewage and to remove phosphorus. The biological phosphorus removal process is carried out by alternately exposing anaerobic and aerobic conditions. In anaerobic conditions, phosphorus is released in microorganisms and released under aerobic conditions Phosphorus is excessively consumed in an amount larger than the amount of phosphorus and excess phosphorus is accumulated in the microorganism body and discharged to the outside to remove phosphorus.

3. The oxic tank (400)

The effluent from the anaerobic tank 300 flows into the aerobic tank 400 and is mixed with the sludge. The function of the oxic tank 400 is to oxidize ammonia nitrogen in the incoming sewage to nitrate nitrogen through nitrifying microorganisms.

The nitrification mechanism in the oxic tank 400 is as follows.

^{_{NH 4 + + 1.682O 2 + 0.182CO}} 2 + 0.0455HCO 3 - →

0.0455C ₂ H ₇ O ₂ N + 0.955NO ₃ ^- + 0.909H ₂ O + 1.909H ⁺

That is, ammonia (NH ₄ ⁺ ) in the influent water is oxidized to nitrate nitrogen (NO ₃ ^- ). At this time, the nitrification process consumes alkalinity. In this process, the sewage and heavy water removed phosphorus from the anaerobic tank 200 are converted into effluent water

First, the nitrified mixed liquor is transferred to the anoxic tank 200 through an internal return pump (not shown), and nitrogen is removed by the denitrification mechanism of the anoxic tank 200.

Secondly, the remaining organic substances used as the carbon source in the anoxic tank 200 and the anaerobic tank 300 are removed during the microbial growth under aerobic conditions.

Third, phosphorus released by PAO microorganisms in anaerobic tank (300) was grown and survived by using PHAs that had been stored under anaerobic conditions under aerobic conditions. At the same time, phosphorus released from anaerobic condition . At this time, the amount of phosphorus absorbed in the aerobic condition absorbs more than the amount of phosphorus released in the anaerobic condition, and the phosphorus concentration in the oxic tank 400 is excessively consumed in the microorganism body, so that the concentration of phosphorus in the aerobic tank 400 is drastically reduced. Exhausting to the outside (disposal of excess sludge) removes phosphorus and oxidizes aerobic microorganisms to organic matter.

In the above process, the aerobic tank 411, the aerobic aeration unit 412, and the micro-bubble supplying unit 410 for minimizing the aeration amount and reducing the energy by increasing the oxygen dissolution rate are formed in the lower part in order to maintain the aerobic condition.

The fine bubble supplying device 410 installed at the entrance to the oxic tank 400 mixes the raw water introduced from the anaerobic tank 300 with the supercharging air conveyed from the submerged membrane separation tank 700 and supplies it to the air supply blower 420 Thereby minimizing the air supply to the oxic tank 400 by the air.

The micro-bubble supplying device 410 installed at the inflow end of the oxic tank 400 is an aeration device commonly used for purification of water quality such as a lake and a pond, and has low power consumption and high solubility in oxygen.

The present invention provides a configuration in which the sewage introduced from the anaerobic tank 300, the supercharge air conveyed from the submerged separation membrane 710, and the minute bubbles generated from the aeration device are mixed and circulated to the oxic tank 400 again .

At this time, the mixed liquid containing the supercharged air supplied and supplied from the air supply blower 420 in the microfilm and the submerged membrane separation tank 700 can be additionally supplemented with dissolved oxygen.

By maintaining the dissolved oxygen concentration in the oxic tank 400 at 1 to 1.5 mg / L, the blowing amount by the air supply blower 420 supplied from the outside can be minimized.

Therefore, it is possible to reduce the amount of energy consumed and the use time of the blower which uses the most power energy in the waste water treatment process.

The air supply blower 420 controls the optimal dissolved oxygen using a DO (not shown) provided in the oxic tank 400.

The fine bubble supplying device 410 supplies air to the discharge pipe (not shown), thereby causing large air bubbles to be converted into fine bubbles by the vortex phenomenon, thereby increasing the dissolution rate and increasing the oxygen transfer efficiency to the mixed liquid with the wastewater. Therefore, the effect of increasing the oxygen dissolution rate and the dissolution duration is generated, and the operation is performed by the intermittent aeration method according to the oxygen dissolution rate and the energy efficiency is reduced by performing the microbubble air dissolution rate of 40% or more.

That is, the microbial mixture liquid having the high dissolved oxygen concentration due to the supercharge air existing in the immersed membrane separation membrane bath 700 is returned to the aerobic tank 400 including the microbubble feeder 410, replenished with sludge and dissolved oxygen And to realize an energy saving type sewage treatment system that can reduce the amount of wind blowing.

4. In the settling tank 500,

The sedimentation tank 500 is a process for separating suspended solids (suspended matter) in water using a specific gravity difference to separate solids and liquids. In the previous process, the organic matter in the sewage is subjected to oxidative decomposition, adsorption or denitrification When sewage sludge generated in this process, that is, sewage sludge and treated water is mixed and flows into the sedimentation tank 500, the sewage sludge heavier than sewage sinks below the sedimentation tank, ) Is transferred to the discharge tank. In other words, the sludge and treated water are subjected to solid-liquid separation by specific gravity difference.

However, in the present invention, the treated sewage, that is, treated water, is transferred to the circulation water tank 600 in which the discharge tank is improved.

5. Circulating water tank 600

In the present invention, the discharge tank at the end of the typical sewage treatment apparatus is upgraded to the circulation water tank 600, and the cleaning powder 620 is introduced into the submerged separation membrane tank 700, which will be described later, using the circulation pump 610 It serves to spray the mixed mixture.

A powder 620 mixed with a substance having an adsorptive property and a natural mineral is injected into the circulation water tank 600 so that the surface of the submerged membrane module 710 formed in the submerged membrane separation tank 700 is dirt or foreign matter Thereby preventing it from clogging.

In other words, the cleaning powder 620 made of the adsorptive material adsorbs contaminants and stimulates the surface of the submerged membrane module 710 to prevent adherence and growth of the foreign substances, It is possible to remarkably reduce clogging.

Another reason for injecting the cleaning powder 620 is that most of the solid material is settled in the settling tank 500. Therefore, when foreign substances adhering to the surface of the immersion type membrane module 710 are introduced into the circulation water tank 600, A solid material having a certain concentration that can be applied to the surface of the submerged membrane module 710 is required to smoothly wash the surface of the submerged membrane module 710 by artificially introducing a substance having an adsorbing component and natural minerals.

In addition, the cleaning powder 620 serves to minimize adverse effects on the human body by adsorbing the foreign substances contained in the moisture.

That is, the moisture discharged through the discharge valve 730 formed in the submerged membrane separation tank 700 is returned to the circulation water tank 600 through the anoxic tank 200, the anaerobic tank 300, and the oxic tank 400, It is called 'circulating water tank'.

Hereinafter, the powdered activated carbon and the natural minerals, which represent representative adsorptive substances corresponding to the main raw material of the powder to be administered to the circulation water tank 600, will be described.

Powdered activated carbon (PAC) is produced at a high temperature of 900 ° C or higher when using sawdust wood and coal as raw materials. The main uses of powdered activated carbon are decolorization of various aqueous solutions, oils, oil dyes intermediates, , Wastewater, removal of impurities, taste control and discoloration, and other uses such as dioxin removal in the air and land improvement agent are widely used. Other adsorbing materials may also include surfactants.

Natural mineral powder is a kind of natural mineral powder which is composed of hard natural apatite including organic matter, calcium, phosphoric acid, magnesium, germanium, and elvan. It contains illite, loess, .

The natural minerals are naturally environmentally friendly materials. In particular, germanium, sodium, and selenium, which contain minerals, are highly porous and adsorbable and contain a large amount of inorganic salts. These inorganic salts interact with heavy metals and ions It has been used to purify contaminated water and to remove harmful metals.

6. Submerged Membrane Preparation (700)

As shown in the drawing, the submerged membrane module 700 includes at least one submerged membrane module 710, a discharge valve 720 and a suction port And a pump 730.

The submerged membrane module 710 performs a function of separating solids and liquids of residual organic matter and sludge mixture.

Since the pores (pore size) of the separation membrane filter 712 of the separation membrane module 710 have a size of 0.02 to 0.2 탆, most of the solids, that is, microbial masses and bacteria, have a size of 0.4 탆 or more, The microbial masses and bacteria are filtered through the membrane filter 712 of the module 710. The submerged membrane filter 712 can be installed in a large amount.

At least one of the submerged membrane modules 710 is formed in the submerged membrane separation tank 700 and has a slender internal hollow shape. The material is selected from c-PVC, hydrophilic PVDF, and hydrophilic PTFE.

2, the submerged membrane module 710 has a structure in which a plurality of membrane filters 712 are arranged side by side, a supporting member 711 which is hermetically fixed and supported at a lower end thereof, A connecting member 713 for connecting to the suction pump 720 is fixedly formed.

Therefore, when the treated water filtered through the separation membrane filter 712 applies negative pressure to the suction pump 720 through the connection member 713, negative pressure is generated inside the separation membrane filter 712, The final purified water is discharged to the outside through the cleaning operation.

The discharge valve 730 discharges the water in the separation membrane tank 700 to the anoxic tank 200. The discharge valve 730 discharges the water in the separation membrane tank 700 to the anoxic tank 200 through the suction pump 720. [ It is also to do.

A description will now be given of the function of the discharge valve 730. When the cleaning powder 620 is almost exhausted or the adsorption capability reaches a certain limit and the cleaning capability is judged to be limited, The water in the immersion membrane separation tank 700 is transferred to the anoxic tank 200 and discharged. (Here, if it is determined that the adsorption performance of the cleaning powder has reached a critical point, new washing powder can be immediately injected into the submerged separation membrane bath 700 after discharging the water.)

(For reference, the amount of water discharged through the water treatment apparatus of the present invention varies depending on the amount of incoming water. However, the amount of water to be discharged through the water treatment apparatus of the present invention is such that the water can be treated at least 2 tons / 710) can be used for infinite processing.

7. Cleaning tank 800

The washing tank 800 further includes a washing tank 800 connected to the submerged membrane separation tank 700 and storing washing water for washing the submerged separation membrane module 710.

The cleaning tank 800 functions to supply cleaning chemicals when the submerged membrane module 710 reaches a time to be cleaned over time. For reference, the cleaning cycle is preferably about 6 months to 1 year.

A cleaning agent to be used for cleaning the submerged membrane module 710 is stored therein. As the cleaning agent, sodium hypochlorite (NaOCl) or citric acid is diluted to a certain concentration.

The cleaning tank 800 includes a cleaning tank 800 for storing a cleaning solution for cleaning the submerged separation membrane module 710 and a cleaning solution for transferring the stored cleaning solution to the interior of the submerged membrane separation tank 700 through pumping And a cleaning liquid transfer line 830 for transferring the cleaning liquid from the cleaning pump 800 into the separation membrane bath 700 by the suction force of the cleaning pump 810, And a differential pressure gauge 820 that senses a differential pressure generated by the water passing through the water passage 710.

That is, the cleaning tank 800 functions to clean the submerged membrane module 710 by sensing a pressure difference generated by moisture passing through the submerged membrane module 710.

Therefore, it is possible to prevent corrosion and the like which may be caused by the use of the submersible membrane module 710 for a long period of time, and to periodically clean the generated dirt.

Hereinafter, the operation of the water treatment apparatus using the cleaning powder and the submerged separation membrane according to the present invention will be described.

First, when sewage or sewage and heavy water are introduced into a flow rate regulating tank (not shown), organic wastewater or organic matter contained in the sewage is consumed, and sewage introduced into the anoxic tank 200 by means of a pump (not shown) (210) is operated to denit nitrogen and treat the organic material.

Thereafter, the treated water is transferred to the anaerobic tank 300 through a pump (not shown) of the anoxic tank 200.

The treated water supplied to the anaerobic tank 300 generates bubbles through means such as a blower or the like, oxidizes and decomposes the remaining organic matter, and changes the ammonia nitrogen of the element to nitrate nitrogen before the denitrification. Phosphorus (P) accumulation bacteria release phosphorus in association with organism storage.

The sewage flowing through the anaerobic tank 300 is also pumped into the oxic tank 400 by the action of the pump. Organic matter is decomposed into carbon dioxide and water by microorganisms, and ammonia nitrogen is nitrified by nitrifying microorganisms into nitrite or nitric acid. In addition, the phosphorus accumulating bacteria overexhausts the phosphorus from the anaerobic tank 300 as oxidized and decomposed of the accumulated organic matter proceeds, and the phosphorus is removed while being discharged in the form of sludge.

In the oxic tank 400, large air bubbles due to vortex phenomenon are converted into fine vapors by the fine bubble supplying device 410 for maintaining the aerobic condition, thereby increasing the dissolution rate and improving the oxygen delivery efficiency to the mixed liquid with the medium and the sewage .

The sewage flowing through the aerobic tank 400 flows into the submerged membrane separation tank 700 and the remainder flows into the sedimentation tank 500 or some of the sewage introduced into the sedimentation tank 500 is separated into a solid, Is introduced into the circulation water tank 600, and the precipitated sludge is returned to the anoxic tank 200 by the sludge return pump (not shown) or discharged to the excess sludge.

When the refrigerant flows into the circulation water tank 600, the circulation valve 640 is opened and the apparatus of the present invention normally operates.

In the circulating water tank 600, when the treated water stored therein is stored through the settling tank 500, the circulating water tank 600 is opened and the washing powder 620 mixed with the adsorbing substance and the natural mineral is manually introduced do.

The mixing ratio (ratio of the adsorbing material to the natural mineral) of each mixture of the washing powders varies depending on the pollutants therein, but is preferably 10 parts by weight to 100 parts by weight based on 100 parts by weight of the total amount of the adsorbing material . That is, it is acceptable to use only one material without mixing the materials.

In this way, the mixed mixture is transferred to the submerged membrane separation tank 700 using the circulation pump 610.

It is possible to adsorb the contaminants contained in the water due to the introduction of the cleaning powder 620 into the submerged separation membrane tank 700 and to significantly increase the rate at which the surface is clogged by the adhesion of foreign matter to the surface of the submerged membrane module 710 It can be delayed.

In other words, the cleaning powder 620 not only has a specific gravity higher than that of water but also has a function of slowing down the clogging of the surface remarkably because the cleaning powder 620 is faster than the water. This makes it possible to substantially eliminate the problem that foreign matters adhering to the surface of the separation membrane can not be properly cleaned due to insufficient solids in the conventional sewage treatment apparatus.

Therefore, due to the introduction of the cleaning powder 620, not only the cleaning effect of the submerged membrane module 710 but also the function of adsorbing the residual contaminants present in the sewage, the sewage is treated more cleanly.

If the adsorbing ability of the cleaning powder 620 deteriorates, the powder must be replaced. This is a method of operating the cleaning powder replacement valve 630 to replenish the cleaning powder 620.

The replacement timing of the cleaning powder 620 is determined by analyzing the quality of the final treated water discharged through the suction pump 720.

For example, assuming that the BOD (biological oxygen demand) increased from 5 ppm in the first month to 7 ppm in the second month and 9 ppm in the third month, the degree of contamination gradually increased. In this case, the cleaning powder 620 The timing of administration has come.

The method of administering the cleaning powder 620 is manually performed by the operator and may be performed directly in the circulating water tank 600 or may be performed inside the immersed separating bath 700 as the case may be.

The treated water flowing out of the oxic tank 400 and the treated water mixed with the washing powder 620 in the circulating water tank 600 flow into the interior of the submerged membrane separation tank 700, And a part thereof flows into the circulation water tank 600 through the discharge valve 730. The water is mixed again with the washing powder 620 and is circulated again by the operation of the circulation pump 610 to the submerged separation membrane tank 700, And the inner submerged membrane module 710 is washed.

If the inside of the submerged membrane module 700 is filled with water and there is a possibility that the submerged membrane module 700 is filled with water, the circulation valve 640 is closed to stop the operation and the discharge valve 730 And the inside water is transferred to the anoxic tank 200 again. The moisture introduced into the anoxic tank 200 flows into the circulating water tank 600 through the anaerobic tank 300, the oxic tank 400 and the settling tank 500 and then mixed with the washing powder 620 to form an immersion type membrane tank 700 to be discharged as water through the suction pump 720.

In this repetitive circulation operation, the submerged membrane module 710 is continuously maintained in the submerged membrane module 700, and the cleanliness of the sewage and heavy water can be further improved by repeating the continuous cleaning operation. The sewage and heavy water treatment procedures of the present invention are possible.

The cleaning liquid can be injected into the submerged separation membrane tank 700 through the cleaning pump 810 of the cleaning tank 800 connected to the side surface of the separation membrane tank 700 so that dirt and foreign matter So that the cleanliness of the module can be maintained at all times.

Accordingly, since the cleaning tank 800 performs a periodic cleaning action, there is no space for accumulating dirt or foreign matter in the interior of the submerged membrane separation tank 700, so that the foreign substances accumulated in the submersible separation membrane tank 700 are separately emptied There is no need to prepare a separate apparatus for processing.

In addition, the shape of the submerged membrane module 710 may be any one selected from the plate type or hollow type membrane. When it is selected as a plate type, it is possible to prevent damage due to aeration (operation of tap water or manual intervention of water and air by injecting air into the water when sewage treatment), and it is possible to prevent a flat plate type microfiltration membrane (Not shown) is also immersed, so that not only the microorganisms but also the particulate matter can be completely removed while the treated water is discharged by the suction pump 720.

In the case of selecting a hollow-type separator membrane, it is preferable that the size of the submerged membrane filter 712 of the submerged membrane module 710 is 0.2 μm or less and the chemical durability is excellent, and the submerged membrane module 710 is made of sludge The solid and microorganisms having a diameter of 0.2 μm or more are retained in the submerged membrane separation tank 700 and decomposed and the remainder is discharged to the treated water.

Hereinafter, a description will be given of the water treatment of the treatment apparatus using the washing powder and the immersion membrane separation type module according to the present invention. (The explanation of the redundant description with the above-described water and wastewater treatment apparatus will be omitted to some extent.)

As shown in FIG. 3, the anoxic tank 200, the anaerobic tank 300, and the oxic tank 400 of FIG. 2 are replaced by the coagulation tank A and the coagulation tank B, respectively.

The overall configuration of the constant-rate processing apparatus shown in Fig.

An agglomeration tank (A) into which a flocculant is injected into a constant and reacts with the flocculant to generate an aggregated liquid in which floc is formed,

A condensation tank (B) for condensing the flocculated liquid transferred from the flocculation tank (A) and the sludge,

A sedimentation tank 500 for conveying or discharging the condensed liquid or sludge having a large specific gravity to the sludge and discharging the condensed liquid or sludge having a small specific gravity to the circulation water tank 600 as effluent,

A circulation water tank 600 for supplying a mixture of the washing powder 620 to the effluent transferred from the settling tank 500 into the submerged membrane separation tank 700,

A submerged membrane module 710 for filtering the foreign substances from the effluent introduced from the circulation water tank 600 is formed and the treated water flowing through the submerged membrane module 710 is discharged, .

Hereinafter, the coagulation tank A and the coagulation tank B, which are components not included in the sewage treatment apparatus described above, will be briefly described.

The flocculation tank (A) reacts with the flocculant to flocculate the flocculant, and flocculates the flocculant in the water to coagulate the impurities in the water to remove the impurities.

That is, the fine particles or the colloidal particles are aggregated into large particles and precipitated and removed in the sedimentation tank 500. Coagulant can be selected depending on the particle type and pH are included in the water and in the flocculant type are aluminum sulfate _{(Al 2 (SO 4) 3} ), ferric chloride (FeCl _3), ferric sulfate (Fe ₂ (SO ₄ ) 3), polyaluminum (PAC), and the like.

In addition, the flocculation tank (A) causes floccs to flocculate. For reference, the flock refers to the aggregate formed when the flocculant is mixed with water. A stirrer 210 'capable of controlling the speed is also installed in the flocculation tank A, and a pH adjuster such as sodium hydroxide or sulfuric acid may be supplied. Since the hydration reaction by the coagulant may proceed quickly in the stirrer 210 ', a high-speed stirrer capable of rapid stirring is preferable.

Also, in the flocculation tank A, sludge circulated through a sludge return line (not shown) may be joined to the flocculated flocculated liquid.

The coagulation bath (B) is such that flocculation liquid and sludge containing flocs agglomerated in the flocculation tank (A) are injected to grow flocs.

The coagulation bath (B) means that the high concentration wastewater condenses and precipitates in itself. The coagulation tank (B) is provided at the downstream end of the coagulation tank and is intended to increase sedimentation rate and efficiency in the sedimentation tank by combining the coagulated particles with larger particles. As a coagulant, a cationic or anionic polymer is generally used.

For example, the acrylamide-based polymer flocculant may be optionally added to the flocculation tank B, and the second stirrer 310 'may be installed.

In the water treatment apparatus constructed as described above, the solid-liquid separation is performed by the difference in the specific gravity of the sludge in the sedimentation tank 500 connected to the sedimentation tank B, and in the aggregated liquid or sludge introduced into the sedimentation tank B, And the remaining small specific gravity is transferred to the circulation water tank 600 as effluent water.

Similarly, the effluent flowing into the circulating water tank 600, as in the previously described sewage treatment apparatus, is mixed with the mixed powder 620 to be mixed and transferred to the submerged membrane separation tank 700 by the circulation pump 610 After washing the submerged membrane module 710, the treated water is discharged through the suction pump 720.

In addition, the description of the configuration and operation of other components such as the discharge valve 730, the cleaning tank 800, and the like is the same as that of the above-described sewage treatment apparatus, and therefore will not be described.

< Example  And Comparative Example >

Experiments of the water treatment apparatus using the washing powder and the submerged membrane module according to the present invention are shown as examples and experiments using the conventional wastewater treatment apparatus are shown as comparative examples.

<Examples>

The inlet flow rate, the internal circulation flow rate and the sludge return flow rate are Q (1.0 m &lt; 2 &gt; / hr), 1.5Q, 0.5Q, and 0.05, respectively, in the water, water and sewage treatment apparatus using the washing powder and the submerged membrane module according to the present invention. Q, and treated water was kept at 0.95Q. The specifications and the residence time of each bioreactor used in the present invention are shown in Table 1 below.

 division  Anaerobic  Anoxic tank  An auger   Circulation tank  Separator tank  Sedimentation tank  Residence time   1.4   2.0   2.0     0.6   4.0   0.2 Capacity (㎡)   28   40   40     12   80    4

Table 2 below shows the concentration of raw water and treated water and the pollutant removal rate for each pollutant during the operation time of the apparatus according to the present invention.

     Item       enemy       Treated water     Removal rate (%)    pH (-)        7.23      7.55        -    SS (mg / l)      198         0       100   Escherichia coli (dogs / ml)        8.000         0       100    COD (mg / L)       53.9       5.1        90.6    BOD (mg / L)       56.0       6.7        88    T-P (mg / L)        2.04       0.78        61.8    T-N (mg / L)       30.9       8.5        72.5

<Comparative Example>

As a result of the advanced sewage treatment process using existing bioreactor and sedimentation tank, the influent flow rate is Q (1.0㎥ / hr), the internal circulation rate is 1.5Q, the sludge return flow rate is 0.5Q, the surplus sludge yield is 0.05Q, Respectively. The specifications and the residence time of the conventional bioreactor are shown in Table 3 below.

  division   Anaerobic  Anoxic tank   An auger   Circulation tank   Sedimentation tank  Retention time (hr)    1.4    2.0    2.5    0.6     1.8   Capacity (㎥)     28    40    50     12     36

Table 4 below shows the contaminant concentration and removal rate of raw water and treated water during the operation time of the apparatus for the existing biological treatment process.

    Item    enemy    Number of treatment    Removal rate (%)     pH (-)    7.15    7.40        -   SS (mg / L)    169     8.7      92.9   Escherichia coli (dogs / ml)      6.0     1.980      67.0   COD (mg / L)     58.4     9.1      79.6   BOD (mg / L)     60.0    10.2      83.0   T-P (mg / L)      2.9     0.7      70.0   T-N (mg / L)     28.9     8.5      70.1

As a result of comparing the pollutant removal efficiencies of the above two treatment devices, the treatment process developed by the present invention was superior to the conventional treatment process by the existing bioreactor, and 100% It can be seen that the improvement is remarkable.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the above teachings. It is self-evident that you can do it.

200: Anoxic
210, 210`: stirrer
300: anaerobic tank
310, 310`: Second stirrer
400:
410: fine bubble supplying device
411: Blower blower
412: Aerodromic facility
420: air supply blower
500: settling tank
600: Circulating water tank
610: circulation pump
620: Cleaning powder
630: Cleaning powder replacement valve
640: circulation valve
700: Submerged separation membrane tank
710: Submerged membrane module
711: Support member
712: Submerged membrane filter
713: connecting member
720: Suction pump
730: discharge valve
740: Plate type filtration membrane
800: Cleaning tank
810: Cleaning pump
820: Differential pressure gauge
830: Cleaning liquid transfer line
L: sludge return line
A: Coagulation tank
B: Condensation tank

Claims (8)

A water treatment apparatus using a washing powder and an immersion type membrane module,
Anoxic tank for denitrifying nitrogen contained in sewage or heavy water and removing organic matter;
An anaerobic tank for introducing sewage or heavy water from which organic matter has been removed in the anoxic tank to decompose the organic matter of the sewage or heavy water to release phosphorus;
The ammonia nitrogenous component of the discharged sewage or heavy water from the anaerobic tank is converted into nitrate nitrogenous effluent, the aerobic microorganism is oxidized and decomposed into organic matter, the oxygen dissolution rate is increased to minimize the amount of the aeration, An aerobic tank in which a micro-bubble supplying device for reducing the amount of air is formed;
A sedimentation tank for transferring or discharging a high specific gravity to sludge among the effluent flowing in the aerobic tank and transferring the remainder to a circulating water tank;
A circulation water tank into which a mixture of a material having an adsorbing component and a cleaning powder as a mixed powder of natural minerals in the effluent transferred from the settling tank is introduced into the submerged separation membrane tank; And
And an immersion type membrane module in which an immersion type membrane module for filtering out foreign matters from the effluent introduced in the circulation water tank is formed,
The submerged membrane module is selected from the group consisting of a planar type membrane and a hollow type membrane. The material is one selected from the group consisting of c-PVC, hydrophilic PVDF, and hydrophilic PTFE.
And a washing liquid transfer line connected to the submerged separation membrane tank for transferring the stored cleaning liquid to the interior of the submerged membrane separation tank and for transferring the cleaning liquid from the cleaning pump to the submerged membrane separation vessel by the suction force of the washing pump, And a differential pressure meter for detecting a differential pressure generated by water passing through the separating membrane module, wherein the separating membrane module includes a washing tank for washing the immersion type membrane module.
delete delete delete The method according to claim 1,
Wherein the hollow fiber separation membrane is made of Polyvinylidene Fluoride, and the plate separation membrane is immersed in a planar microfiltration membrane for removing microorganisms and particulate matter.
The method according to claim 1,
The submerged membrane module is formed in the form of an aggregate in which a plurality of membrane filters are arranged side by side,
A support member hermetically fixed and supported at a lower end thereof; And
Wherein a connection member for connecting to a suction pump is fixedly formed on an upper portion of the separation membrane filter.
The method according to claim 1,
Wherein the mixing ratio of the washing powder is 10 to 100 parts by weight of a natural mineral based on 100 parts by weight of the powder having adsorption properties.












delete

Images