KR102131735B1 - Compact type aeration tank for sewage treatment and sewage treatment system comprising the same - Google Patents

Abstract

The present invention relates to a compact aeration tank for sewage treatment and a sewage treatment system including the same, and more specifically, it is used in treating sewage, food waste, or livestock waste. The structure is simple, but the treatment efficiency is excellent. It relates to a sewage treatment system.
The compact aeration tank for sewage treatment provided by the present invention aggregates a large amount of organic substances contained in the sewage in the organic substance agglomeration body, injects microbubbles into the sewage from the solid-liquid separation body, and floats the solid agglomerates of organic matter, thereby increasing By separating with efficiency, the treatment time can be shortened and the sludge discharge amount is significantly reduced, so that the subsequent dehydration process can be omitted. In addition, the aeration tank provided in the present invention has a very high surface area load of 40 m/hr or more, and thus, the sewage treatment amount per site area is very high.

Description

Compact type aeration tank for sewage treatment and sewage treatment system comprising the same}

The present invention relates to a compact aeration tank for sewage treatment and a sewage treatment system including the same, and more specifically, it is used in treating sewage, food waste, or livestock waste. It relates to a sewage treatment system.

Conventional general sewage treatment facilities mainly use the standard activated sludge method or the added or modified method of the above method, and use A ₂ /O process, UCT process, VIP process, etc. in foreign countries. It has not been applied to the domestic confluence-type sewage treatment system, and the A ₂ /O process is a biological treatment process that improves the A/O process to remove nitrogen and phosphorus, and the reaction tank is an anaerobic tank. It consists of anoxic tank, aerobic tank, and consists of internal return (Nitrifer Recycle) to remove nitric nitrogen and return of sedimentation sludge. In the anaerobic tank, microorganisms are released from the aerobic tank by releasing phosphorus under anaerobic conditions. This makes it possible to consume excessively, and the anoxic tank removes nitrogen and phosphorus by denitrifying the nitrate of the internal conveying water of the aerobic tank.

Through the A ₂ /O process, nitrogen and phosphorus are removed from the sewage to reduce nutrients in the sewage, but the focus is on removing nitrogen and phosphorus from the sewage. There is a problem that it cannot be removed.

Most of the above sewage treatment plants are operated as a biological treatment method using a method in which contaminants are decomposed by microorganisms. The biological treatment method has been proven for a long time and is the most effective and safe method, but the problem is that excess sludge is generated.

Since surplus sludge is mostly an organic substance as a lump of microorganisms, it is easy to decay and treatment is a problem. So far, it has largely relied on ocean dumping, some of which have been landfilled or incinerated. As of 2012, the amount of surplus sludge generated more than 10,000 tons per day and more than 365 million tons per year, and will continue to increase in the future.

Regarding the treatment of the surplus sludge, ocean dumping has been banned since 2012, and policies to promote the renewable energy of organic wastes such as waste resources, energyization and weight reduction have been promoted. In particular, the treatment efficiency in the treatment of sludge through an anaerobic digester Solubilization pre-treatment process is carried out to increase the aforesaid, and the pre-treatment techniques include biological methods using high-temperature aerobic microorganisms, ultrasonic and hydrodynamic cavitation, physical methods using thermal hydrolysis and ball mill crushing equipment, ozone treatment and alkali chemical treatment. A chemical method, a complex treatment method in which a plurality of the above treatment methods are combined and treated, and an electric method using electrolysis are used, but there is a problem in that it is difficult to commercialize due to high cost or low loss efficiency.

As a sludge solubilization method for increasing digestion efficiency of the anaerobic digester, Korean Patent No. 10-135458 softens or destroys the cell membrane of biodegradable microorganisms in the sludge by treating the excess sludge generated in the wastewater treatment process with an alkali catalyst and methanol. In order to improve the efficiency of anaerobic digestion by anaerobic microorganisms in the digester, the above-described operational management difficulties and management costs are a problem.

An object of the present invention is to provide a compact aeration tank that reduces the amount of sludge and the processing time by excellent solid-liquid separation efficiency after agglomeration of organic matter, while being able to minimize the site area due to its simple structure.

Another object of the present invention is to provide a sewage treatment system capable of reducing the amount of by-products and the processing time while minimizing the site area through a simple structure including the aeration tank provided in the present invention.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention, claims and drawings.

The embodiments of the present invention are provided to more fully describe the present invention to those of ordinary skill in the art, and the following embodiments can be modified in various other forms, and the scope of the present invention is as follows. It is not limited to the Examples. Rather, these examples are provided to make the present disclosure more faithful and complete, and to fully convey the spirit of the present invention to those skilled in the art.

In addition, the thickness or size of each layer in the drawings is assumed for convenience and clarity of description, and the same reference numerals in the drawings refer to the same elements. As used herein, the term “and/or” includes any and all combinations of one or more of the listed items.

The terminology used herein is used to describe a specific embodiment and is not intended to limit the present invention. As used herein, singular forms may include plural forms unless the context clearly indicates otherwise. Also, as used herein, “comprise” and/or “comprising” specifies the shapes, numbers, steps, actions, elements, elements and/or the presence of these groups. And does not exclude the presence or addition of one or more other shapes, numbers, actions, elements, elements and/or groups.

According to an embodiment of the present invention, an accommodation space for receiving sewage, an inlet for supplying sewage to the accommodation space, and an outlet for discharging sewage accommodated in the accommodation space to the outside, the organic matter contained in the sewage The agglomerated organic matter agglomeration body; And

Sewage discharged through the discharge port of the organic aggregate body includes a solid-liquid separation body to separate the solid and liquid phase of the sewage,

The solid-liquid separation body recovers the flotation tank grown in the flotation tank and the flotation tank grown in the flotation tank by injecting fine bubbles into the sewage storage tank in which the sewage is temporarily stored, and microbubbles to recover the liquid phase. It includes a separation tank to separate from the treated water,

The sewage storage tank and the floating tank are partitioned through a partition wall extending downwardly from an upper surface of the solid-liquid separation body, and the floating tank and the separation tank are partitioned through a partition wall extending upward from a bottom surface of the solid-liquid separation body,

The lower portion of the floating tank relates to a compact aeration tank including one or more micro-bubble injection devices for injecting micro-bubbles into the sewage.

In the present invention, the microbubble injection device may be included in two or more.

In the present invention, any two microbubble injection devices of the two or more microbubble injection devices may be divided and arranged through a partition wall extending upward from the bottom surface of the floating tank or a partition wall extending downward from the upper surface of the floating tank. Can.

In the present invention, the lower portion of the separation tank may further include a micro-bubble injection device for injecting micro-bubbles into the treated water to be separated.

In the present invention, an end portion of a partition wall separating the floating tank and the separation tank may further include a guide unit for guiding discharge of sewage to the separation tank.

In the present invention, an upper portion of the separation tank may further include a skimmer for recovering suspended solid organic matter.

In the present invention, the solid-liquid separation body may further include a treated water discharge tank for discharging the treated water separated from the separation tank.

In the present invention, the separation tank and the treated water discharge tank may be partitioned and arranged through a partition wall extending downwardly from an upper surface of the solid-liquid separation body.

In the present invention, the sewage storage tank may further include a micro-filter for separating the supplied sewage primarily by solid-liquid.

In the present invention, the micro filter may be microseive.

In the present invention, the micro filter may be made of polyethylene.

In the present invention, the pore size of the micro filter may be 150 to 800㎛.

In the present invention, the micro filter may be provided in the form of a rotating belt.

According to another embodiment of the present invention, the compact aeration tank according to the present invention for agglomeration of organic matter contained in the sewage;

A sedimentation tank that precipitates the floc aggregated in the aeration tank with excess sludge;

An anaerobic digester for anaerobic digestion of excess sludge generated in the sedimentation tank; And

The present invention relates to a sewage treatment system comprising an anaerobic ammonium-oxidizing bacteria reaction tank for anaerobic digestion of ammonium-containing wastewater generated in the anaerobic digestion tank using anaerobic ammonium-oxidizing bacteria (Anammox) and separating only the bacteria.

In the present invention, it may further include a primary sedimentation tank for separating the wastewater into a solid state at the front end of the aeration tank.

In the present invention, the raw sludge generated in the primary sedimentation tank may further include a raw sludge supply pipe for supplying the anaerobic digester.

In the present invention, a biogas collector for collecting biogas generated in the anaerobic digester may be further included.

In the present invention, the anaerobic ammonium-oxidizing bacteria reaction tank may include a treatment tank in which the desorption liquid is accommodated, and a separation membrane module in which anaerobic ammonium-oxidizing bacteria (Anammox) are supported and anaerobic digestion of the desorption liquid is performed.

In the present invention, the anaerobic ammonium-oxidizing bacteria reaction tank may further include a membrane support frame which is disposed in the treatment tank to which the separator module is mounted, and a reciprocating means connected to the membrane support frame and reciprocating the membrane support frame.

In the present invention, the lower end of the membrane support frame may further include a foreign matter flotation unit to support foreign matter accumulated in the treatment tank.

In the present invention, the separator module includes a plurality of pores, and the diameter of the pores may be 50 to 150 μm.

In the present invention, the anaerobic ammonium-oxidizing bacteria may be planktomycetes (Planctomycetes).

The compact aeration tank for sewage treatment provided by the present invention aggregates a large amount of organic substances contained in the sewage in the organic substance agglomeration body, injects microbubbles into the sewage from the solid-liquid separation body, and floats the solid agglomerates of organic matter, thereby increasing By separating with efficiency, the treatment time can be shortened and the sludge discharge amount is significantly reduced, so that the subsequent dehydration process can be omitted. In addition, the aeration tank provided in the present invention has a very high surface area load of 40 m/hr or more, and thus, the sewage treatment amount per site area is very high.

Figure 1 schematically shows the structure of a compact aeration tank according to an embodiment of the present invention.
Figure 2 schematically shows the structure of a compact aeration tank according to an embodiment of the present invention.
Figure 3 schematically shows the structure of a sewage treatment system according to an embodiment of the present invention.
Figure 4 schematically shows the structure of the anaerobic ammonium-oxidizing bacteria reaction tank according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

The compact aeration tank and sewage treatment system of the present invention will be described with reference to the drawings.

1 schematically shows the structure of a compact aeration tank according to an embodiment of the present invention, the compact aeration tank 100 of the present invention may include an organic substance agglomeration body 10 and a solid-liquid separation body 20 have.

In more detail, the organic matter agglomeration body 10 includes a receiving space 11 for receiving the sewage 1, an inlet 12 for supplying the sewage 1 to the receiving space 11, and the receiving space ( 11) may include a discharge port 13 for discharging the sewage (1) accommodated in the outside.

In the present invention, after supplying the sewage 1 to be treated through the inlet 12 of the organic substance agglomeration body 10, although not shown in the drawing, the floc formation storage tank connected to the organic substance agglomeration body 10 By supplying a floc forming material into the receiving space 11 through the organic material contained in the sewage (1) to grow as a floc (floc) it is possible to lower the BOD and COD in the sewage.

In addition, in the present invention, by further comprising at least one stirrer 14 inside the receiving space 11 of the organic matter agglomeration body 10, it is possible to promote the mixing process of the sewage 1 and the floc formation.

In the present invention, the shape of the stirrer 14 is not particularly limited, but may be an impeller type having wings. Here, the specific shape of the impeller-type stirrer is not particularly limited, but according to a preferred embodiment of the present invention, the impeller-type stirrer 14 is formed by bending the outer wing portion toward the lower direction of the inner wing portion. You can maximize the agitation effect by pushing as much water as possible in the desired direction to flow as if collecting water and pushing it out with force.

In the present invention, when there are a plurality of agitators 14, the blade diameters of a plurality of agitators may be the same or different, but preferably, a plurality of agitators having different blade diameters decrease in diameter from the upper chamber to the lower chamber side. Placing can increase the floc production efficiency due to the faster mixing rate as the influent moves from the top of the chamber to the bottom.

At this time, the rotation speed (G-value) of the stirrer 14 blade is not particularly limited, and may be appropriately selected according to the mixing and agglomeration scale or the size of the chamber, but may preferably be 30 to 110 sec ^-1 .

In the present invention, by further including an air injection device 15 in the lower end of the receiving space 11 of the organic matter agglomerated body 10, by injecting air into the sewage (1) accommodated in the receiving space 11, sewage ( 1) circulates inside the receiving space 11 to facilitate the mixing process with the floc formation and to further coarsen the floc.

In addition, in the present invention, the type of the floc formation is not particularly limited, and a chemical floc formation or a biological floc formation may be used, but the biological floc formation is preferred in terms of removal efficiency of organic substances.

In the present invention, as the chemical floc forming material, a floc (agglomerate) may be formed by condensing or aggregating a suspended substance (a turbid substance), a colloidal component, and a soluble COD (chemical oxygen demand) component contained in the water to be treated. , For example, inorganic flocculants such as aluminum or iron salts such as aluminum oxide, ferrous sulfate, ferric sulfate, ferric chloride, and polyaluminum chloride (PAC), polymer flocculants, cationic polymer gels made from MT Aqua polymer And particles composed of a cationic polymer that swells in water such as phosphorus acogel C and is substantially insoluble in water, and these can be used alone or in combination.

In addition, in the present invention, the biological floc formation may include one or more selected from the group consisting of Ammonia Oxidizing Bacteria (AOA), Ammonia Oxidizing Bateria (AOB) and Nitrix Oxidizing Bacteria (NOB).

In addition, in the present invention, a flocculant may be additionally added together with the floc formation, wherein the flocculant can be selected from the group consisting of clay, calcium hydroxide, cationic flocculants, anionic flocculants, and nonionic flocculants.

In the present invention, when the organic matter contained in the sewage 1 in the organic matter agglomeration body 10 is grown as a solid aggregate, that is, a floc, the treated sewage 1 is discharged from the organic matter agglomeration body 10 as described above. It can be discharged through (13).

In the present invention, the sewage 1 discharged through the outlet 13 of the organic substance agglomeration body 10 is supplied to the upper part of the sewage storage tank 21 of the solid-liquid separation body 20 by a pump through a pipe and temporarily stored. Can be.

In the present invention, the solid floc contained in the sewage 1 transferred to the sewage storage tank 21 can be moved in the direction of the lower portion of the sewage storage tank 21 by gravity. However, in the present invention, a micro filter 22 may be provided inside the sewage storage tank 21. Therefore, the floc contained in the sewage 1 moves to the lower part of the sewage storage tank 21 and does not pass through the micro filter 22, so that it remains as solid sludge. Accordingly, in the present invention, the sewage containing the floc can be separated into the solid sludge 3 and the liquid primary treatment water 2 through the micro filter 22.

In the present invention, it is preferable that the micro filter 22 is a microseive. In the present invention, the micro sheave includes a plurality of pores, and the size of the pores is not particularly limited, but may be, for example, 150 to 800 μm, and preferably 150 to 350 μm.

In addition, in the present invention, it is preferable that the microsieve is a polyethylene material, because it can lower the water content of the sludge separated into a solid phase.

In addition, although the shape of the microsieve is not particularly limited in the present invention, it is preferable to be provided in a rotating belt sieve because it can simultaneously carry out concentration and dehydration processes simultaneously with filtration.

In the present invention, the sewage storage tank 21 may be divided into a floating tank 23 disposed adjacent to the partition wall 24 extending downward from the upper surface of the solid separation body 20 to the bottom, and the sewage storage tank 21 The lower portion of the opening can communicate with the floating tank 23. Accordingly, the primary treated water 2 that has passed through the micro filter 22 as described above moves to the lower portion of the sewage storage tank 21 and then opens the open area 25 located at the lower part of the sewage storage tank 21. Through the floating tank 23 can be moved downward.

In the present invention, since the micro-bubble injection device 26 is installed at the bottom of the floating tank 23, when the primary treated water 2 reaches the lower portion of the floating tank 23 as described above, the micro-bubble injection device (26) is injected into the micro-bubbles in the primary treatment water, the micro-organisms contained in the primary treatment water (2) float upward with the micro-bubbles and collide with each other by flocking to coarse the floc to treat the liquid secondaryly It can be separated from the number (4).

In the present invention, one microbubble injection device 26 may be provided at the lower portion of the floating tank 23, but preferably, two or more microbubble injection devices 26 may be provided. FIG. 2 schematically shows the structure of a compact aeration tank including two or more micro-bubble injection devices in an embodiment of the present invention, and three micro-bubble injection devices 26a and 26b at the bottom of the floating tank 23. , 26c) may be provided.

In the present invention, among the plurality of microbubble injection devices 26a, 26b, and 26c, microbubble injection devices 26a and 26b, or 26b and 26c, which are adjacent to each other, may be partitioned by partition walls 27a and 27b. In the present invention, the partition walls 27a and 27b partitioning the microbubble injection device may be formed to extend upward from the bottom surface of the floating tank 23 (27a), or may be formed to extend downward from the top surface of the floating tank. (27b). Here, the installation position of the partition walls 27a and 27b is not particularly limited, but the first microbubble injection device 26a and the second microbubble injection device 26b are based on the flow direction of the sewage. ) Is divided into a partition wall (27a) extending upward from the bottom surface, the second micro-bubble injection device (26b) and the third micro-bubble injection device (26c) is extended downward from the upper surface of the floating tank (23) It is preferable to be divided into partitions 27b to increase solid-liquid separation efficiency as the movement distance of the primary treatment water is increased.

In the present invention, the floating tank 23 may be divided into a separation tank 28 disposed adjacent to and a partition wall 29 extending upward from the bottom surface of the solid separation body 20, and the floating tank 23 The upper portion of the opening can be in communication with the separation tank (28). Accordingly, as described above, when the primary treated water 2 is separated into the liquid secondary treated water 4 and the solid organic aggregate 5, that is, the floc in the floating tank 23, these are the floating tank 23. It can be moved to the top of the separation tank 28 through the open area 30 located at the top of the.

However, in the present invention, at the end of the partition 29 partitioning the floating tank 23 and the separation tank 28, a guiding unit 31 guiding the flow of the primary treatment water 2 to the separation tank 28 May be provided. In the present invention, the guide portion 31 may be formed to extend a predetermined length from the end of the partition wall 29 to the upper side of the separation tank 28.

In the present invention, an upper portion of the separation tank 28 is provided with a skimmer 32 for recovering suspended solids, and is transported to the separation tank 28 to recover solid organic aggregates 5 floating thereon. can do.

In the present invention, a microbubble injection device 33 is additionally provided at the bottom of the separation tank 28 to further supply microbubbles to the secondary treated water 4 separated from the solid phase of the organic aggregate 5. Accordingly, it is possible to increase the recovery rate of the solid phase by also floating some organic matter that is not floating and sinking.

In addition, in the present invention, the separation tank 28 may be divided into a treated water discharge tank 34 disposed adjacent to and a partition wall 35 extending downward from the upper surface of the solid separation body 20, and the separation The lower portion of the tank 28 can be opened to communicate with the treated water discharge tank 34. Accordingly, the liquid secondary treatment water 4 separated from the solid organic aggregates 5 in the separation tank 28 as described above is through an open region 36 located at the bottom of the separation tank 28. It can be moved to the bottom of the treated water discharge tank 34 to be finally discharged.

Figure 3 schematically shows the structure of a sewage treatment system according to an embodiment of the present invention, the sewage treatment system 1000 of the present invention is a compact aeration tank 100, sedimentation tank 200, anaerobic according to the present invention Digestion tank 300 and an anaerobic ammonium-oxidizing bacteria reaction tank 400 may be included.

However, the present invention may further include a primary sedimentation tank 500 for separating the sewage in a solid state at the front end of the aeration tank 100 based on the supply direction of the sewage 1.

In the present invention, after supplying the sewage (1) to the primary sedimentation tank (500), the foreign matter contained in the sewage (1) can be recovered by sedimentation with fresh sludge (501). In more detail, when the sewage 1 is supplied to the primary sedimentation tank 500, it is divided into a material having a specific gravity higher than water (fresh sludge) and a material having a specific gravity less than water (floating material). 1) It is possible to remove approximately 40% of the contaminants contained in.

In addition, in the present invention, the liquid sewage 502 separated from the raw sludge 501 in the primary sedimentation tank 500 may be supplied to the aeration tank 100. The detailed configuration and function of the aeration tank 100 are duplicated as described above, and detailed description is omitted.

In the present invention, the suspended solids contained in the sewage 502 in the organic matter agglomeration body 10 of the aeration tank 100 can be aggregated and grown as a floc, and then inside the sewage storage tank 21 of the solid-liquid separation body 20. The sewage 502 is first separated into the solid sludge 101 and the liquid primary treatment water 102 by the installed micro filter 22, and then the primary treatment water 102 in the separation tank 28. Can be further separated into solid organic aggregates 103 and secondary treated water 104. At this time, the secondary treatment water 104 may be discharged to the outside after an additional disinfection process.

In addition, in the present invention, the solid-state sludge 101 recovered from the micro-filter 22 of the solid-liquid separation main body 20 and the solid-state organic aggregates 103 recovered from the separation tank 28 are settling tanks 200. Denitrification can be performed by an anaerobic digestion process by transferring to the biological reactor 600 prior to transport.

In the present invention, the sludge 601 in which the anaerobic digestion process is performed in the biological reaction tank 600 may be transferred to the precipitation tank 200. In the present invention, the solid phase sludge 601 in the sedimentation tank 200 can be separated into solid-liquid by surplus sludge 201 and tertiary treatment water 202 by gravity. At this time, the tertiary treatment water 202 may also be discharged to the outside after an additional disinfection process.

In the present invention, it is possible to separate the solid sludge 101 having a water content of only about 70 to 80% from the sewage 501 by the micro filter 22 of the aeration tank 100, unlike the conventional sewage treatment system. Alternatively, a separate dehydration tank may not be included after the second precipitation process. However, in some cases, in order to perform an additional dehydration process from the excess sludge 201, although not shown in the drawings, a dehydration tank may be further included.

In the present invention, the surplus sludge 201 discharged from the sedimentation tank 200 or the dehydration tank may be supplied to the anaerobic digestion tank 300 afterwards. In addition, in the present invention, the raw sludge 501 separated from the primary sedimentation tank 500 may also be supplied to the anaerobic digester 300 through the raw sludge supply pipe 510.

In the present invention, the anaerobic digester 300 may perform an anaerobic digestion process on the excess sludge 201 and the raw sludge 501 using anaerobic microorganisms.

Here, the anaerobic digestion process is also known as “methane fermentation”, and is a series of processes that convert organic matter contained in the excess sludge 201 to methane by the decomposition action of various anaerobic microorganisms, and more specifically, solid organic matter. The process of liquefying and hydrolyzing, producing low-fatty acids (volatile organic acids, VF A) that produce vinegar, propionic and butyl acids, decomposing them into vinegar and H ₂ gas, using these products The process proceeds to produce methane.

In the present invention, in the anaerobic digester 300, it is possible to recover energy with biogas called methane at the same time as the treatment of concentrated sludge. Accordingly, the present invention may further include a biogas collector 700 that collects biogas generated in the anaerobic digester 300, and bio-separates methane and carbon dioxide contained in the biogas, if necessary. A gas separation membrane may be further included.

In the present invention, when the anaerobic digestion process is performed in the anaerobic digestion tank 300, digestion sludge 301 and desorption liquid 302 that are no longer recyclable are generated. The digested sludge 301 can be disposed of, and the desorption solution 302 can be supplied to the anaerobic ammonium-oxidizing bacteria reaction tank 400.

In the case of the conventional sewage treatment system, after performing the anaerobic digestion process using concentrated sludge in the anaerobic digester, the resulting desorption liquid was transferred to the primary sedimentation tank and retreated. In that case, however, the desorption liquid generated in the anaerobic digester contains NH ⁴⁺ or NO ^2-, and if the sewage treatment is performed in a continuous process, the concentration of nitrogen continues to rise and C (carbon)/N (nitrogen) in the aeration tank. The ratio exceeds 1, and finally, a problem that energy production efficiency in the anaerobic digester is significantly lowered occurs.

In the present invention, in order to prevent the above problems, by transferring the lysate 302 generated in the anaerobic digester 300 to the anaerobic ammonium-oxidizing bacteria reaction tank 400, by reacting with the anaerobic ammonium-oxidizing bacteria (Anammox), the lysate ( 302) NH ⁴⁺ and NO ² included in N ₂ may be converted to N ₂ to remove nitrogen.

In the present invention, the anaerobic ammonium-oxidizing bacteria may be planktomycetes (Planctomycetes). In general, AOB bacteria used as a floc formation in the aeration tank 100 can convert about 50% of NH ⁴⁺ to NO ^2- , but Plank Mycetes used in the anaerobic ammonium-oxidizing bacteria reaction tank in the present invention (Planctomycetes) can convert both NH ⁴⁺ and NO ^2- to N ₂ . In addition, in the present invention, the Planktomycetes (Planctomycetes) is adsorbed with the surrounding organic material, to form a granule (granule), wherein the particle size of the granules, compared to AOA, AOB and NOB bacteria, relatively large particles Since the size can be represented, it can be selectively separated according to the particle size in the separator module 420, as described later.

In the present invention, the final treatment water 401 generated in the anaerobic ammonium-oxidizing bacteria reaction tank 400 is first removed by removing nitrogen contained in the desorption liquid 302 in the anaerobic ammonium-oxidizing bacteria reaction tank 400 as described above. Even if the sewage treatment process is performed by transferring to the sedimentation tank, the ratio of C (carbon)/N (nitrogen) in the aeration tank 100 can be maintained at ≤ 1, so that energy production efficiency can be maintained even in a continuous process for sewage treatment.

Figure 4 shows the structure of the anaerobic ammonium-oxidizing bacteria reaction tank 400 according to an embodiment of the present invention, the anaerobic ammonium-oxidizing bacteria reaction tank 400 of the present invention is a treatment tank 410 and a membrane module 420.

In the present invention, the desorption liquid 302 transferred to the anaerobic ammonium-oxidizing bacteria reaction tank 400 may be accommodated inside the treatment tank 410. In addition, in the present invention, a separation membrane module 420 including a plurality of hollow fiber membranes may be provided inside the treatment tank 410.

In the present invention, the anaerobic ammonium-oxidizing bacteria are carried inside the separator module 420, and when the desorption solution 302 flows through the pores formed in the separator module 420, the anaerobic ammonium-oxidizing bacteria By performing an anaerobic digestion reaction, granules are formed.

In the present invention, by adjusting the diameter of a plurality of pores included in the hollow fiber membrane of the separator module 420 to 50 to 150㎛, the granules do not pass through the separator module 420 and remain inside, and the anaerobic Nitrogen is removed by the digestion reaction and contained in the purified tally liquid, and bacteria such as AOA, AOB, and NOB used as a floc formation in the aeration tank 100 are processed through the pores of the separation membrane module 420 again. ).

In addition, in the present invention, the final treated water 401 purified as described above and bacteria such as AOA, AOB, and NOB contained therein are recovered separately, and the primary settling tank 500 or the aeration tank through the treatment water re-supply pipe 430 Can be re-supplied at (100).

However, in the present invention, the anaerobic ammonium-oxidizing bacteria reaction tank 400 is disposed inside the treatment tank 410, in particular, at the bottom thereof, the membrane support frame 440 and the membrane support frame on which the separator module 420 is mounted. It may further include a reciprocating means 450 connected to the 440 and reciprocating the membrane support frame 440.

In the present invention, the membrane support frame 440 is disposed inside the processing tank 410, and a membrane module 420 in the form of a membrane may be mounted on the membrane support frame 440. At this time, a plurality of separator modules 420 may be installed side by side on the membrane support frame 440.

As will be described later, a reciprocating means 450 is connected to the membrane support frame 440, and the membrane support frame 440 is integrally reciprocated with the separator module 420 by the reciprocating means 450. ) Can be reciprocated by the sliding means 470.

In the present invention, the reciprocating means 450 is connected to the membrane supporting frame 430, and the sliding means 470 provided on the membrane supporting frame 440 is provided to reciprocate as if sliding on the reciprocating frame 460. Can.

In the present invention, through the reciprocating motion, the membrane module 420 is continuously flowed during anaerobic digestion, so that the foreign matters and the like deposited on the membrane module 420 may be separated by inertia to clean the membrane. . This ultimately prevents the membrane from clogging so that the efficiency of the system can be maintained.

In addition, since the reciprocating distance of the reciprocating means 440 can be adjusted as described above, it is possible to efficiently adjust the reciprocating distance (amplitude) according to the degree of contamination of the separator module 420 through the inter-membrane differential pressure (TMP) measurement. You can save more.

In the present invention, at the bottom of the membrane support frame 430, the foreign matter inside the desorption liquid 302 supplied to the processing tank 410 is prevented from being accumulated as sludge at the lower end of the processing tank 410. It may further include a foreign matter flotation unit 480.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are only examples for helping the understanding of the present invention, and the scope of the present invention is not limited thereto.

Example

[Example 1]

The aeration treatment of sewage was performed using the aeration tank 100 shown in FIG. 1. Specifically, after supplying the sewage (1) into the receiving space (11) through the inlet (12) of the organic matter agglomeration body (10) of the aeration tank (100), AOB and NOB as a floc forming material, the receiving space (11) Supplied internally. Using the stirrer 14 present inside the organic substance agglomeration body 10 to mix the sewage 1 and the floc formation, using the air injection device 15 installed at the lower end of the organic substance agglomeration body 10 By injecting air into the sewage (1), the suspended matter and organic matter contained in the sewage (1) were grown as flocs by an aerobic digestion process. Thereafter, the sewage (1) was discharged through the outlet (13) of the organic matter agglomeration body (10) and then supplied to the top of the sewage storage tank (21) of the solid-liquid separation body (20) through a pump. In the sewage storage tank 21, while the sewage moves downward due to gravity, a microsieve 22 made of polyethylene is installed inside the sewage storage tank 21 to pass solid sludge 3 and liquid primary treatment water. (2). Subsequently, the primary treated water 2 was transferred to the lower portion of the floating tank 23 through the open area 25 under the sewage storage tank 21. The microbubbles were injected into the primary treatment water 2 using three microbubble injection devices 26a, 26b, and 26c existing under the floating tank 23, and accordingly, the primary treatment water ( 2) The organic substance existing therein grew as a floc. When the primary treated water 2 including the floc reaches the third micro-bubble injection device 26c, the primary treated water 2 is guided through the open area 30 above the floating tank 23 Following the guidance of (31), it is transferred to the upper portion of the separation tank 28, but the solid organic aggregates 5 by the micro bubbles injected from the third fine bubble injection device 26c are the top of the separation tank 28. Was floating on. Therefore, all of the floating agglomerates 5 are recovered using the skimmer 32, and the secondary treated water 4 separated from the separated agglomerates 5 is opened in the lower portion of the separation tank 28 (36). ) To the treated water discharge tank 34 and discharged to the outside.

[Comparative Example 1]

In the same manner as in Example 1, the aeration treatment of sewage was performed using the aeration tank 100 shown in FIG. 1, but a polypropylene material of Clarifier was used as the micro sieve 30.

[Comparative Example 2]

In the same manner as in Example 1, the aeration treatment of sewage was performed using the aeration tank 100 shown in FIG. 1, but a polysulfone material of Clarifier was used as the micro sieve 30.

[Comparative Example 3]

In the same manner as in Example 1, the aeration treatment of sewage was performed using the aeration tank 100 shown in FIG. 1, but a polyester material of Clarifier was used as the micro sieve 30.

[Comparative Example 4]

In the same manner as in Example 1, the aeration treatment of sewage was performed using the aeration tank 100 shown in FIG. 1, but a nylon material made of Clarifier was used as the micro sieve 30.

[Comparative Example 5]

The aeration treatment of sewage was performed using the aeration tank 100 shown in FIG. 1 in the same manner as in Example 1, but solid-liquid separation of the sewage was performed using Captivator® of Evoqua instead of the solid-liquid separation main body 20.

[Evaluation Example 1] Measurement of water content of sludge

After recovering the solid sludge that did not pass through the micro sheave obtained in Examples 1 and Comparative Examples 1 to 4, the water content was measured and the results are shown in Table 1 below.

division Water content (%) Example 1 73.5 Comparative Example 1 98.7 Comparative Example 2 95.7 Comparative Example 3 97.2 Comparative Example 4 91.3

As shown in Table 1, in Comparative Examples 1 to 4, when polypropylene, polysulfone, polyester, or nylon microsieves are used, the water content of the separated sludge is very high, about 91.3 to 98.7%, so that an additional dehydration process is necessary. Although required, it was found that in the case of using a microsieve made of polyethylene according to the present invention, the water content of the separated sludge was remarkably low at 73.5%, so that an additional dehydration process was unnecessary.

[Evaluation Example 2] Evaluation of measurement of treatment efficiency

The surface area load ratio of the aeration tank of Example 1 and the aeration tank of Comparative Example 5 and the reduction rate of COD and total suspended solution (TSS) in the primary treated water compared to sewage were measured, and the water content of the separated sludge was measured, and the results are shown in the following table. It is shown in 2.

division Surface area load (m/hr) COD removal rate (%) TSS removal rate (%) Water content (%) Example 1 45 70 82 73.5 Comparative Example 5 8.8 55 70 96.8

As shown in Table 2, when the aeration tank of Comparative Example 5 is used, the surface area load is only about 8.8 m/hr, but in the case of the aeration tank of the present invention, the surface area load is 40 m/hr or more, so that the sewage treatment amount compared to the site area is significantly I knew that it was high.

In addition, when the aeration tank of Comparative Example 5 was used, the reduction rates of COD and TSS in the treated water were only 55% and 70%, respectively, but when the aeration tank of the present invention was used, the removal rate was 70% and 82%, respectively. It was confirmed that it was remarkably high.

In addition, when the aeration tank of Comparative Example 5 was used, the water content of the separated sludge was also very high at 96.8%, so an additional dehydration process was absolutely required. It was found that the dehydration process was unnecessary.

Although the embodiments of the present invention have been described in detail above, the scope of rights of the present invention is not limited thereto, and it is possible that various modifications and variations are possible without departing from the technical spirit of the present invention as set forth in the claims. It will be apparent to those of ordinary skill in the field.

1: Sewage 2: Primary treated water 3: Solid sludge
4, 104: secondary treatment water 5, 103: solid organic aggregates
10: organic matter aggregation body 11: receiving space 12: inlet
13: outlet 14: agitator 15: air injection device
20: solid-liquid separation body 21: sewage storage tank 22: micro filter
23: floating tank 24, 27a, 27b, 29, 35: bulkhead
25, 30, 36: open areas 26, 26a, 26b, 26c, 33: microbubble injection device
28: separation tank 31: guide 32: skimmer
34: treated water discharge tank
100: aeration tank 200: sedimentation tank 201: surplus sludge
202: tertiary treatment water 300: anaerobic digester 301: digested sludge
302: tally solution 400: anaerobic ammonium-oxidizing bacteria reaction tank
401: final water 410: treatment tank 420: separator module
430: treated water re-supply pipe 440: membrane support frame 450: reciprocating means
460: reciprocating frame 470: sliding means 480: foreign matter flotation
500: primary settling tank 501: fresh sludge 502: liquid sewage
510: raw sludge supply pipe 600: biological reactor 601: sludge
700: biogas collector 1000: sewage treatment system

Claims (22)

A primary sedimentation tank for separating the supplied sewage into solid-liquid;
A compact aeration tank that receives the sewage from which the raw sludge is separated from the primary sedimentation tank and aggregates organic substances contained in the sewage from which the raw sludge is separated;
A sedimentation tank that precipitates the floc aggregated in the aeration tank with excess sludge;
An anaerobic digester for anaerobic digestion of excess sludge generated in the sedimentation tank;
A biogas collector for collecting biogas generated in the anaerobic digester;
A raw sludge supply pipe supplying the raw sludge generated in the primary sedimentation tank to an anaerobic digester; And
Including anaerobic ammonium-oxidizing bacteria (Anammox) using anaerobic ammonium-oxidizing bacteria (Anammox) to anaerobic digestion of the ammonium-containing wastewater generated in the anaerobic digestion tank, and then only the anaerobic ammonium-oxidizing bacteria to contain the reaction tank;
The compact aeration tank is an organic matter agglomeration body in which the organic matter contained in the sewage separating the raw sludge is aggregated; And a solid-liquid separation body for separating solid liquid from sewage discharged from the organic aggregate body.
The organic matter agglomeration body includes an inlet for supplying sewage separating the raw sludge; An accommodation space accommodating sewage supplied from the inlet; And an outlet for discharging sewage accommodated in the accommodation space to the outside. A floc formation storage tank for supplying a floc formation; A stirrer for mixing the sewage inside the receiving space and the floc formation; And an air injection device formed at a lower end of the accommodation space to inject air to circulate the sewage inside the accommodation space.
The solid-liquid separation main body includes a sewage storage tank in which sewage water supplied from the organic aggregate body is temporarily stored; A floating tank that injects micro-bubbles and floats organic substances contained in the sewage located therein and grows into a solid floc; And a separation tank for recovering the solid floc grown in the floating tank and separating it from the liquid treated water.
The sewage storage tank includes a microsieve rotating belt-type micro filter having a pore diameter of 150 to 800 μm, which is a polyethylene material that primarily separates sewage supplied from the organic matter agglomerating body in a solid state,
The sewage storage tank and the floating tank are partitioned through a partition wall extending downwardly from an upper surface of the solid-liquid separation body,
The floating tank and the separation tank are partitioned through a partition wall extending upward from a bottom surface of the solid-liquid separation main body,
The lower portion of the floating tank includes two or more microbubble injection devices for injecting microbubbles into the sewage located inside the floating tank; however, any two microbubble injection devices among the two or more microbubble injection devices are The partition is arranged through a partition wall extending upward from the bottom surface of the floating tank or a partition wall extending downward from the upper surface of the floating tank,
The lower portion of the separation tank further includes a micro-bubble injection device for injecting micro-bubbles into the separated treatment water,
The upper portion of the separation tank further includes a skimmer (skimmer) for recovering the suspended solid organic matter,
It further includes a guide unit for guiding the discharge direction of the sewage located in the floating tank to the separation tank at the end of the partition wall separating the floating tank and the separation tank,
The solid-liquid separation body further includes a treated water discharge tank for discharging the treated water separated from the separation tank, the separation tank and the treated water discharge tank are partitioned through a partition wall extending downwardly from an upper surface of the solid-liquid separation body. Is placed,
The floc formation comprises at least one member selected from the group consisting of Ammonia Oxidizing Archaea (AOA), Amonia Oxidizing Bateria (AOB) and Nitrix Oxidizing Bacteria (NOB);
The anaerobic ammonium-oxidizing bacteria reaction tank includes a treatment tank in which ammonium-containing wastewater generated in the anaerobic digestion tank is accommodated; An anaerobic ammonium-oxidizing bacterium (Anammox) carried inside the treatment tank to perform an anaerobic digestion reaction of the ammonium-containing wastewater, including a plurality of pores, and a separator module having a diameter of 50 to 150 μm; A membrane support frame on which the separator module is mounted; A reciprocating means connected to the membrane support frame to reciprocate the membrane support frame; And a debris flotation unit that supports the debris accumulated in the treatment tank at the bottom of the membrane support frame. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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