KR102497137B1 - Advanced wastewater treatment apparatus comprising floating filter tank with improved treating efficiency - Google Patents

Abstract

The present invention provides an advanced sewage treatment apparatus comprising a floating filtration tank having improved treatment efficiency, which comprises: a flow rate control tank (1); an anaerobic tank (2) removing phosphorus in treated water introduced from the flow rate control tank (1); an anoxic tank (3) removing nitrate nitrogen in the treated water introduced from the anaerobic tank (2); an aerobic tank (4) aerating air into the treated water introduced from the anoxic tank (3) to nitrify nitrogen; a sedimentation tank (5) separating the treated water introduced from the aerobic tank (4) into supernatant and sludge; a high-temperature sterilization unit (200) sterilizing the treated water at high temperature by heat exchange; and a floating filtration tank (100), wherein the high-temperature sterilization unit (200) is installed on the front end of the floating filtration tank and consists of an inner pipe (210) through which the treated water is transported and an outer pipe (220) that surrounds the inner pipe (210) and supplies high-temperature heat to the treated water in the inner pipe by allowing a high-temperature heat medium to flow therethrough.

Description

Advanced sewage treatment system including floating filter tank with improved treatment efficiency

The present invention relates to an advanced sewage treatment system, and more particularly, to rapidly and effectively treat organic matter and nutrients (nitrogen and phosphorus) in wastewater with a low C/N ratio, to purify wastewater, and to reduce the installation area of wastewater treatment facilities. It relates to an advanced sewage treatment system including a flotation filter with improved treatment efficiency that can be easily operated and managed.

Recently, as the eutrophication of rivers, coastal seas and lakes (lakes and reservoirs) caused by nutrient salts of urban sewage, village sewage, and wastewater is serious, it is necessary to treat nutrient salts as a countermeasure against this.

Methods for removing nitrogen and phosphorus from wastewater can be divided into physical and chemical methods and biological methods. Physical and chemical methods require a lot of economic cost by using treatment facilities and chemicals.

Therefore, many biological treatment methods using economical microorganisms have been developed. However, these biological treatment methods have many difficulties in solving residence time, site area, nitrogen treatment efficiency, and ability to cope with inflow load fluctuations in domestic wastewater treatment with a low C/N ratio.

In order to solve these problems, a modification of the existing nitrogen ㅇ phosphorus treatment process (Badenpo, A 2 /O, UCT and VIP, etc.) and a process using media are being developed. Nitrogen treatment process using media can shorten residence time, reduce installation area, and reduce sludge generation during wastewater treatment by using high-concentration microorganisms attached to media. In particular, the treatment process using flotation media has a great advantage over other fluidized bed media and fixed bed media because the unit price of the media is low, and stable treatment water quality can be achieved through biological degradation and physical filtration at the same time.

The most important thing in the operation of treatment facilities using flotation media is the backwash method. The current backwashing method consists of backwashing using air, water and a propeller. The backwashing method using air requires a lot of power costs because it is injected at high pressure by a blower and a compressor, and the backwashing method using water during backwashing has a disadvantage in that an excessive amount of water is consumed. In the backwashing method using air or water, a wide lower space due to the expansion of the filter medium must be secured. In addition, the backwashing method by the propeller is generally used with water, but it requires a lot of power cost.

In general, a treatment facility using flotation media is a treatment facility for removing organic matter and suspended matter, and only 20 to 30% of nitrogen and phosphorus is removed by the assimilation of microorganisms. Therefore, treatment facilities for organic matter, nitrogen and phosphorus using flotation media are still insufficient. Furthermore, since it is impossible to check real-time conditions in the filtration tank, including the floating filter media, it is difficult to devise appropriate measures for each situation in time, resulting in a problem of lowering treatment efficiency.

An object of the present invention is to quickly and effectively treat organic matter and nutrients (nitrogen and phosphorus) of wastewater with a low C/N ratio to purify wastewater, reduce the installation area of wastewater treatment facilities, and facilitate operation and management. It is an object of the present invention to provide an advanced sewage treatment system including a flotation filter with improved efficiency.

The technical problem of the present invention as described above is achieved by the following means.

(1) flow control tank; an anaerobic tank for removing phosphorus in the water to be treated flowing in from the flow control tank; an anoxic tank for removing nitrate nitrogen from the water to be treated flowing in from the anaerobic tank; an aerobic tank for nitrifying nitrogen by aerating air into the water to be treated flowing from the anoxic tank; a sedimentation tank which separates the water to be treated from the aerobic tank into supernatant and sludge; a high-temperature sterilization unit that sterilizes the water to be treated by heat exchange; And including a flotation filtration tank,

The high-temperature sterilization unit is installed at the front end of the flotation filtration tank, and consists of an inner tube through which the water to be treated is transported, and an exterior that surrounds the inner tube and supplies high-temperature heat to the water to be treated in the inner tube by flowing a high-temperature heat medium inside the inner tube. An advanced sewage treatment system including a flotation filter with improved treatment efficiency.

(2) In the above (1), the floating filter tank,

Including an inlet through which the water to be treated flows in, a flotation filtration device installed in the inflow space of the water to be treated, and an outlet through which the water to be treated is discharged,

The floating filter device,

A filter tank having an inlet filter net attached to the bottom and a discharge filter net attached to one side of the top, and accommodating the flotation filter medium therein to filter the water to be treated; a flotation filter medium accommodated in the filtration tank and removing contaminants while floating together with the water to be treated; A first propeller mounted on a first side of the upper part of the filter tank to move the water to be treated to a second side opposite to the first side; a second propeller mounted on a lower second side of the filtration tank to move the water to be treated to the opposite first side; an ultrasonic generator mounted on a lower first side of the filter tank and radiating ultrasonic waves to the floating filter media moving together with the water to be treated moved by the second propeller; and a guide bulkhead formed to be spaced apart from the second side wall of the filtration tank and guiding the water to be treated and the flotation media to circulate downward. Device.

(3) In the above (2),

The first propeller, the second propeller, and the ultrasonic generator are housed in the inner accommodating part of the side wall.

(4) In the above (2),

At least one oxygen supply unit is mounted in the vertical direction inside the guide bulkhead, and the oxygen supply unit is composed of an oxygen supply pipe and an oxygen supply nozzle, and removes contaminants contained in the floating filter medium and the water to be treated. Sewage advanced treatment system.

According to the present invention, the organic matter and nutrients (nitrogen and phosphorus) of wastewater with a low C/N ratio are quickly and effectively treated to purify wastewater, reduce the installation area of wastewater treatment facilities, and facilitate operation and management. provides

1 is an overall configuration diagram of an advanced sewage treatment system according to the present invention.
Figure 2 is a configuration diagram of a high-temperature sterilization unit and flotation filtration tank according to the present invention.
Figure 3 is a detailed configuration of the flotation filter device according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The detailed description set forth below in conjunction with the accompanying drawings is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details for the purpose of providing a thorough understanding of the present invention. However, one of ordinary skill in the art to which this invention pertains knows that the invention may be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted or may be shown in block diagram form centering on core functions of each structure and device.

Throughout the specification, when a part is said to "comprising" or "including" a certain element, it means that it may further include other elements, not excluding other elements, unless otherwise stated. do. Also, the term "... unit" described in the specification means a unit that processes at least one function or operation. Also, "a or an", "one", "the" and similar related words in the context of describing the invention (particularly in the context of the claims below) Unless indicated or otherwise clearly contradicted by context, both the singular and the plural can be used.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the embodiment of the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

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

As shown in FIG. 1, the advanced sewage treatment system of the present invention is an anaerobic tank (2) for removing phosphorus in the water to be treated flowing in from the flow control tank (1), and the quality of the water to be treated flowing in from the anaerobic tank (2) An anoxic tank (3) for removing acidic nitrogen, an aerobic tank (4) for nitrifying nitrogen by aerating air into the treated water flowing from the anoxic tank (3), and treating the treated water flowing from the aerobic tank (4) as supernatant and sludge It includes a sedimentation tank 5 for separating into, a high-temperature sterilization unit 200 for high-temperature sterilization of the supernatant by heat exchange, and a flotation filter tank 100.

In the present invention, the device configuration except for the high-temperature sterilization unit 200 and the flotation filter tank 100 may be used as it is. Hereinafter, the high-temperature sterilization unit and the flotation filtration tank will be described with emphasis, and detailed descriptions of other specific device configurations will be omitted.

As shown in FIG. 2, the high-temperature sterilization unit 200 according to the present invention is installed at the front end of the flotation filtration tank 100, surrounds the inner tube 210 through which the water to be treated is transported, and the inner tube 220, and inside It consists of an outer tube 220 in which a high-temperature heat medium flows and supplies high-temperature heat to the water to be treated in the inner tube.

The heating medium may be high-temperature steam, and is injected into the space between the outer tube 220 and the inner tube through an external steam supply device (not shown) to flow. The inner tube 210 is a tube through which the supernatant liquid separated from the settling tank 5 is transported. Heat is supplied by a heat medium flowing inside the outer tube to promote the decomposition of various organic substances and at the same time provide an effect of sterilizing microorganisms.

As shown in FIG. 2, the advanced sewage treatment apparatus according to the present invention includes a flotation filter tank 100 at the end, and the flotation filter tank 100 is mounted in the inlet part 110 and the inlet space part 140. It includes a filtering device 120 and a discharge unit 130.

In the present invention, a camera unit 150 is installed on the top of the flotation filter 120. The camera unit 150 may be a conventional surveillance camera that photographs the upper surface of the transparent top plate 13 of the flotation filter 120.

Preferably, micro-bubble supply units 160 and 161 are mounted on the lower portion of the flotation filter 120. The micro-bubble supply unit includes a micro-bubble supply pipe 160 and a micro-bubble supply nozzle 161. Although not shown, the micro-bubble supply pipe 160 is connected to an external micro-bubble generator to receive micro-bubbles.

When the microbubbles are supplied onto the inlet filter net 11 constituting the lower surface of the flotation filter device 120, the microbubbles promote the diffusion of contaminants contained in the water to be treated, thereby increasing the contact efficiency with the flotation filter medium 20. promote

The ascending microbubbles form a predetermined pattern when they operate normally on the transparent top plate 13, but the pattern is well observed in situations where they cannot operate normally (for example, situations where the floating filter medium aggregates with each other or does not move well). will not become The camera unit 150 monitors this pattern in real time and transmits the corresponding image to the situation analysis server 300. After analysis, the real-time situation is automatically transmitted to the manager (mobile terminal, etc.).

In addition, the flotation filter device 120 according to the present invention is preferably mounted on one side inside the flotation filter tank 100, and the water to be treated passes through the inlet part 110 to the inlet space, which is the inner space of the flotation filter tank 100. It flows into 140 and is discharged through the discharge unit 130 via the flotation filter 120 mounted on one side.

As shown in FIG. 3, the flotation filter device 120 includes a filter tank 10 equipped with an inlet filter net 11 and an outlet filter net 12, a flotation filter medium 20, a first propeller 30, a first 2 includes a propeller 40, an ultrasonic generator 50, and a guide bulkhead 60.

As a preferred embodiment of the present invention, in the flotation filter device 120, the flotation filter medium 20 is accommodated inside the filter tank 10, and the flotation filter medium 20 is combined with the water to be treated in the filter tank by forced convection. (10) Circulate inside.

In the filter tank 10 according to the present invention, an inflow filtering net 11 is mounted on the bottom so that the water to be treated flows into the inside from the bottom to the top. The inflow filter net 11 is required to have a mesh structure of a size that allows water to be treated to flow in and prevents the floating filter medium 20 from escaping.

In addition, a discharge filtering net 12 connected to the discharge unit 130 is mounted on the upper side wall of the filter tank 10 to discharge the treated water. Through the discharge filter net 12, the treated water is discharged to the discharge unit 130, but the flotation filter medium 20 is required to have a mesh structure of a size that prevents it from being discharged.

The first propeller 30 is mounted on an upper end of one side inside the filter tank 10 (hereinafter referred to as "first side").

While rotating by a motor (not shown), the first propeller 30 flows the water to be treated (together with the floating filter media 20) to the other side opposite to the horizontal direction (hereinafter, referred to as the “second side”). raise and transport

The water to be treated including the floating filter medium 20 transported to the second side by the first propeller 30 reaches the discharge filtration net 12, and some of it is discharged as treated water, and the floating filter medium 20 moves downward by gravity or Settled by forced convection.

The second propeller 40 is mounted on the lower end of the second side of the filter tank 10. The second propeller 40 is driven by a motor (not shown) to generate and circulate the flotation media 20 precipitated together with the water to be treated in the opposite direction to the first side.

In the present invention, the ultrasonic generator 50 is mounted at the bottom of the first side of the filter tank 10. The ultrasonic generator 50 radiates ultrasonic waves toward the water to be treated and the floating filter medium 20 transported by the second propeller 40 . The irradiation of the ultrasonic wave may be performed at a certain period, for example, every backwashing process, because the filtering efficiency decreases when a large amount of contaminants adhere to the flotation filter medium 20 to form a cake. In this process, the cake desorbed through ultrasonic radiation is sedimented downward by gravity and can be removed from the bottom of the flotation filter tank 100.

Preferably, a plurality of the first propeller 30, the second propeller 40, and the ultrasonic generator 50 may be installed at regular intervals according to the size of the floating filter tank, and the side wall inner accommodating parts 31, 41, 51 ) are separately housed and protected, and the inlet is protected by filtering nets (32, 42, 52).

Unlike this, the ultrasonic radiation may be continuously performed even during the filtration process, which can greatly improve the contact efficiency of contaminants with the floating filter medium 20 by forming a vortex in the water to be treated flowing from the bottom. In this case, contaminants desorbed by ultrasonic waves are removed by settling downward in the case of relatively large substances, or fine substances are resuspended together with the incoming raw water, mixed, and treated together. According to this process, contaminants are not easily attached to the flotation filter medium 20, making it possible to treat the flotation medium 20 without a separate cleaning process for a long period of time.

Inside the filtration tank 10 of the present invention, preferably, guide partition walls 60 are formed in a vertical direction spaced apart from the sidewall of the second side at regular intervals. The guide bulkhead 60 guides the water to be treated and the floating filter medium 20 transported to the second side by the operation of the first propeller 30 to move downward.

The guide bulkhead 60 may be spaced apart from the second side wall and supported by at least one supporter 61 .

Preferably, at least one oxygen supply unit 62 is mounted in the vertical direction inside the guide partition wall 60. The oxygen supply unit 62 is composed of an oxygen supply pipe 62a and an oxygen supply nozzle 62b mounted inside the guide partition wall. The oxygen supply unit 62 receives oxygen through an external oxygen supply cylinder or an oxygen supply device 70 such as a compressor.

Therefore, contaminants are adsorbed in the process of floating together with the water to be treated in the filtration tank 10, and in the process of being guided downward by the guide partition wall 60, the oxygen microbubbles supplied from the oxygen supplier 62 It is possible to oxidize and treat contaminants such as organic matter adsorbed by the wastewater treatment efficiency.

According to the configuration of the present invention as described above, by adopting a method in which the flotation filter medium 20 circulates inside, it is possible to accommodate a larger amount than the conventional flotation filtration method, and thus the treatment efficiency can be greatly improved.

Of course, the size and optimum rotational speed of the first propeller 30 and the second propeller 40 may be set differently depending on the viscosity and amount of the water to be treated or the content of the flotation media contained therein.

As described above, although it has been described with reference to the preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be done.

10: filter tank
20: wound media
30: first propeller
40: second propeller
50: ultrasonic oscillator
60: guide bulkhead
100: flotation filter
110: inlet
120: flotation filter
130: discharge unit
150: camera unit
200: high temperature sterilization unit
300: situation analysis server

Claims (4)

flow control tank; an anaerobic tank for removing phosphorus in the water to be treated flowing in from the flow control tank; An anoxic tank for removing nitrate nitrogen from the water to be treated flowing from the anaerobic tank; an aerobic tank for nitrifying nitrogen by aerating air into the water to be treated flowing from the anoxic tank; a sedimentation tank which separates the water to be treated from the aerobic tank into supernatant and sludge; a high-temperature sterilization unit for high-temperature sterilization of water to be treated by heat exchange; And including a floating filter tank,
The high-temperature sterilization unit is installed at the front end of the flotation filtration tank, and includes an inner tube through which the water to be treated is transported, and an exterior that surrounds the inner tube and supplies high-temperature heat to the water to be treated in the inner tube by flowing a high-temperature heat medium inside,
The flotation filter tank includes an inlet through which the water to be treated flows, a flotation filter installed in the inflow space of the water to be treated, and an outlet through which the water to be treated is discharged,
The floating filter device,
A filter tank having an inlet filter net attached to the bottom and a discharge filter net attached to one side of the top, and accommodating the flotation filter medium therein to filter the water to be treated; a flotation filter medium accommodated in the filtration tank and removing contaminants while floating together with the water to be treated; A first propeller mounted on a first side of the upper part of the filter tank to move the water to be treated to a second side opposite to the first side; a second propeller mounted on a lower second side of the filtration tank to move the water to be treated to the opposite first side; an ultrasonic generator mounted on a lower first side of the filter tank and radiating ultrasonic waves to the floating filter media moving together with the water to be treated moved by the second propeller; and a guide bulkhead formed to be spaced apart from the second side wall of the filtration tank and guiding the water to be treated and the flotation media to circulate downward. Device. delete According to claim 1,
The first propeller, the second propeller, and the ultrasonic generator are housed in the inner accommodating part of the side wall. According to claim 1,
At least one oxygen supply unit is mounted in the vertical direction inside the guide bulkhead, and the oxygen supply unit is composed of an oxygen supply pipe and an oxygen supply nozzle, and removes contaminants contained in the floating filter medium and the water to be treated. Sewage advanced treatment system.

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