KR20130085002A - Wastewater treatment equipment - Google Patents

Abstract

PURPOSE: A wastewater treating facility is provided to stabilize water current in a treating bath and to reduce the consumption of aerating air by generating short two spiral flows caused by an air diffuser based on a V-shaped screen structure. CONSTITUTION: A wastewater treating facility comprises a treating bath (5), an air diffuser (6), and a carrier separator (1). Wastewater is biologically treated by being in contact with a carrier (C), on which microorganisms are immobilized, in the treating bath. The air diffuser generates spiral flows and supplies oxygen to the wastewater in the treating bath. The carrier separator comprises parallel wire or rod-shaped screens (2). The separated sides of the screens are slanted in order to arrange the carrier in the upstream of an outlet (5B) for the treating bath. A common water draining area (T) extended from the outlet is formed between the two screens. The carrier separator is supported by a supporting leg (12) in order to isolate the carrier separator from the bottom of the treating bath.

Description

Wastewater Treatment Facility {WASTEWATER TREATMENT EQUIPMENT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment facility, and more particularly, to an improvement of a wastewater treatment facility where biologically treated by contacting a carrier having immobilized microorganisms with the wastewater.

BACKGROUND ART Conventionally, wastewater treatment facilities include a treatment tank for biological treatment by contacting a wastewater introduced from an inlet port with a carrier immobilized with microorganisms, an air dispersing device that generates oxygen and supplies oxygen to the wastewater in the treatment tank, and a wire rod. Or having a screen formed in parallel with the rod-shaped body, and inclined so that the separating surface of the screen is obliquely downward, and disposed upstream of the outlet of the treatment tank to prevent the carrier from being discharged to the outside of the treatment tank together with the treated wastewater. Carrier addition methods composed of one carrier separation device are widely used.

This carrier separation device is spaced in the vertical direction on the back of the gas ejection mechanism disposed below the screen and the back surface of the separation surface of the screen which induces the gas ejected from the gas ejection mechanism to rise along the separation surface of the screen. And a plurality of plate-shaped gas induction plates arranged to be inclined upward toward the separation surface side, and having a guide plate parallel to the separation surface of the screen, and a flow path through which the treated wastewater flows between the separation surface and the guide. Is formed (for example, refer patent document 1).

In the wastewater treatment facility of the carrier addition method, the wastewater introduced into the treatment tank is a carrier and an aerobic state in which microorganisms are immobilized by gas (oxygen as aeration air) from an acid generator disposed below the treatment tank. Is contacted with nitrogen to form a nitrogen stream, and a predetermined water flow (orbital flow) generated by aeration air in the treatment tank flows into a flow path formed between the separation surface and the guide plate, and the carrier in the treatment tank is moved out of the treatment tank. While being discharged by the separating surface of the screen, it is sent to the next process from the outlet as treated wastewater.

Furthermore, the gas blown out from the gas blowing mechanism disposed below the screen is raised along the separation surface of the screen by the gas induction plate, thereby preventing the fibrous material such as human hair floating in the treatment tank from being entangled in the screen, The entangled fibrous material is peeled off (hereinafter referred to as screen cleaning).

By the way, in this kind of wastewater treatment facility, the whole surface aeration system is often employ | adopted, and in the carrier separation apparatus provided with only one screen, the swirl flow in the processing tank generated by the aeration air is the whole in a treatment tank. Since the flow becomes one large swirl flow, the flow tends to be unstable, and there is a problem that the supply amount of the aeration air needs to be increased in order to stabilize the flow.

Moreover, since the carrier separation device which is a mechanical structure is provided in the wall surface of the processing tank which is a civil engineering structure, it is necessary to raise the intensity | strength of the processing tank which is a civil engineering structure, and there existed a problem that installation cost increased.

In addition, since the gas ejection structure from the gas ejection mechanism arranged in the carrier separation device has a structure that punctures a plurality of fine holes ejected by gas to a closed part such as a pipe connected to a gas supply source, it is necessary to maintain and maintain the gas. When the gas is stopped, the wastewater in the treatment tank flows back from the micropores into the pipe, and this is repeated, causing clogging in the micropores, which significantly reduces the cleaning effect of screen cleaning. The distance from the supply source did not uniform the amount of gas blown out from the micropores, and there was also a problem that it was difficult to efficiently clean the entire screen.

Japanese Patent Laid-Open No. 2004-148154

The present invention has been made in view of the problems of the conventional wastewater treatment equipment, and aims to stabilize the flow of water in the treatment tank, reduce the supply amount of aeration air, and minimize the strength burden of the treatment tank, which is a civil engineering structure. do.

In order to achieve the above object, the wastewater treatment facility of the present invention is a treatment tank for biological treatment by contacting a wastewater introduced from an inlet port with a carrier having immobilized microorganisms, and generating a swirl flow in the wastewater in the treatment tank while simultaneously producing oxygen. And a screen comprising a wire rod or rod-shaped body in parallel with each other, and a carrier separation device configured to be inclined so that the separation surface of the screen is obliquely downward and disposed upstream of the outlet of the treatment tank. In the treatment facility, the screen of the carrier separation device is arranged so that the two screens face the back side of the separation surface of both screens so as to form a common drainage area leading to the outlet. The carrier separation device is supported by a support leg that is free from the bottom of the treatment tank. And it characterized in that a support.

In this case, the carrier separation device is provided with a gas blowing mechanism composed of a trough opened downward so that gas supplied from a gas supply source disposed below the screen can be stored, and the gas blowing portion formed in the trough. A plurality of plate-shaped gas induction plates arranged on the rear surface of the separation surface of the screen to induce the gas blown out along the separation surface of the screen to be inclined upward toward the separation surface side at intervals in the vertical direction. Can be accepted sequentially.

In addition, the carrier separation device can be supported by a support leg.

In addition, a plurality of the carrier separation devices can be arranged in series.

Further, in this case, it is possible to provide an inflow quantity adjusting mechanism for adjusting the quantity of wastewater flowing into the drainage region from each carrier separation apparatus by adjusting the water level of the drainage regions of the plurality of carrier separation apparatuses.

In this case, the gas ejection part is constituted by the lower edge of the trough partition wall arranged along the separation surface, and more specifically, the lower edge of the trough partition wall serving as the gas ejection part is above the other part. It may be formed so as to be located.

Moreover, the said gas blowing part can be comprised by the gas blowing port provided in the partition wall of the trough.

According to the wastewater treatment facility of the present invention, a treatment tank for biological treatment by contacting a wastewater introduced from an inlet port with a carrier immobilized with a microorganism, an acid generator device for generating swirl flow and supplying oxygen to the wastewater in the treatment tank; And a carrier separation device having a screen configured in parallel with wire rods or rod-shaped bodies, and arranged to be disposed upstream of the outlet of the treatment tank by inclining the separation surface of the screen to be obliquely downward. The two screens are arranged so as to face the back side of the separation surface of both screens so that a common drainage area leading to the outlet port is formed, and the carrier separation device having the screens is free from the bottom of the treatment tank. By supporting by the support legs, two screens It becomes the state which became independent in V shape in a tank, and turns into two short swirl flows which the swirl flow which generate | occur | produces by the gas (aeration air) supplied from the diffuser apparatus with respect to two separate surfaces of a screen, The water flow inside is stabilized, and the supply amount of aeration air can be reduced.

In addition, by allowing the carrier separation device to stand in the treatment tank, the burden of strength of the treatment tank serving as the civil engineering structure can be minimized.

Moreover, the said carrier separation apparatus is provided with the gas ejection mechanism comprised by the trough opened downward so that the gas supplied from the gas supply source arrange | positioned below the screen may be exhausted, and it ejects from the gas ejection part formed in the said trough. On the back surface of the separation surface of the screen which guides the formed gas to rise along the separation surface of the screen, it is sequentially arranged in a plurality of plate-shaped gas guidance plates arranged at an interval in the vertical direction and inclined upward toward the separation surface side. The gas for cleaning to clean the screen can be discharged toward the screen once it is stored in a trough opened downward, so that the entire screen is uniformly cleaned in the width direction of the screen. At the same time, since the bottom of the trough is open, the cleaning effect of screen cleaning due to clogging or the like The degradation does not occur.

In addition, by supporting the carrier separation device with the support legs, the carrier separation device can be freely supported and stably supported.

Further, by arranging the plurality of carrier separation devices in series, the treatment efficiency of wastewater can be improved.

In this case, an inflow water amount adjusting mechanism for adjusting the amount of wastewater flowing from each carrier separation device to the drainage area by adjusting the water level of the drainage areas of the plurality of carrier separation devices, thereby reducing the load on each carrier separation device. It can be made uniform.

In addition, the gas ejection part is composed of the lower edge of the trough partition wall disposed along the separation plane, and more specifically, the lower edge of the trough partition wall serving as the gas ejection part is located above other parts. By forming so that the gas which exceeds the capacity | capacitance of the gas which can be stored in a trough can be ejected toward the whole screen of a screen as a gas for washing | cleaning sequentially.

In addition, by forming the gas ejection portion formed in the trough partition wall, from the gas ejection port formed on the partition wall of the trough, for example, the upper surface of the partition wall, the width of the screen is determined by the head pressure of the treatment tank. The gas uniform in the direction can be ejected from the gas ejection port.

Moreover, even if a blockage occurs in the gas ejection opening formed in the partition wall, the trough is opened downward, and the gas ejection is not interrupted in the middle, and the number of times of cleaning the gas ejection opening by the operator and cleaning of the screen itself can be greatly reduced. Can be.

In addition, even in the cleaning operation performed by the worker, since the trough is open downward, the trough can be easily performed, and the working time can be greatly reduced, and the operating cost can be drastically reduced.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional front view of a partial cutaway showing one embodiment of a wastewater treatment plant of the present invention.
2 shows the wastewater treatment plant, (a) is a plan view of some notches, and (b) is a cross-sectional side view of some notches.
3 is a front view of a partially cutaway cross-sectional view showing a carrier separation device of the wastewater treatment facility.
Fig. 4 shows the inflow quantity adjusting mechanism of the carrier separation device, (a) is a front view of a partially cutaway section, and (b) a side view of a partially cutaway section.
Fig. 5 shows a gas blowing mechanism of the carrier separation device, (a) is a front sectional view showing an example in which the gas blowing portion is formed by the lower edge of the partition wall of the trough disposed along the separation surface of the screen, (b) The top view.
FIG. 6: shows another structural example of the said gas blowing mechanism, (a) is the front sectional drawing which shows the example which comprised the gas blowing opening which formed the gas blowing part in the partition wall of the trough, (b) is the said top view, (c) Is an enlarged view of the main part.
Fig. 7 shows another configuration example of the gas ejection mechanism, and (a) shows an example in which the gas ejection portion is composed of a gas ejection opening consisting of a plurality of small holes in a partition wall of the upper surface and a lower edge of the partition wall along the separation surface of the screen. (B) is the said top view, (c) the said principal part enlarged view.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the separation apparatus of this invention is described based on drawing.

(Example 1)

1 to 7 show one embodiment of the wastewater treatment facility of the present invention.

This wastewater treatment facility P causes swirling in the wastewater in the treatment tank 5 and the wastewater in the treatment tank 5 by biologically treating the carrier C having immobilized microorganisms with the wastewater introduced from the inlet 5A. At the same time, it includes a diffuser device 6 for supplying oxygen, and a screen 2 configured in parallel with a wire rod or a rod-like body, and inclined so that the separating surface 2A of the screen 2 is obliquely downward. A carrier separation device 1 arranged so as to be disposed upstream of the outlet 5B of the head), and the screen 2 of the carrier separation device 1 connects the two screens 2 to the outlet 5B. In order to form a common drainage area T, the carrier separating device 1 having the screen 2 is provided while being disposed so as to face the back side of the separating surfaces 2A and 2A of both screens 2 and 2. It is supported by the support leg 12 which became independent from the bottom face of the processing tank 5. .

As described above, the wastewater treatment facility P is an equipment of a carrier addition method in which the wastewater is brought into contact with the carrier C having immobilized microorganisms in the treatment tank 5 for biological treatment (mainly nitrogenization treatment). Although the carrier separation apparatus 1 is demonstrated for separating the treated wastewater and the carrier C, it is not limited to this, It can use as an installation for the purpose of separating the impurity contained in wastewater.

The support legs 12 supporting the carrier separation device 1 allow the carrier separation device 1 to stand in the processing tank 5 so as to minimize the strength burden of the processing tank 5, which is a civil engineering structure. In this case, the position for supporting the carrier separation device 1, the number of installations, and the like are not particularly limited, but the carrier separation device 1 is positioned at a position higher than 1/3 of the position below the height direction of the screen 2. 1 to 2, and as shown in FIGS. 1 and 2, the pairs are arranged in pairs when viewed from the front, and are arranged in plural when viewed from the side, so that the support legs 12 are placed [particularly]. When viewed from the front, a sufficient distance can be maintained between the pairs of support legs 12 and 12, so that the carrier separation device 1 can be stably supported.

In addition, by disposing a plurality of carrier separation devices 1 in series in the treatment tank 5 of this wastewater treatment facility P, the wastewater treatment efficiency can be improved.

In this embodiment, four carrier separation devices 1 are arranged in total, each of which is configured such that one side of the two carrier separation devices 1 is opposed to or shared with each other. It is suitably determined by the volume of the processing tank 5, the surface area of the screen 2 of the carrier separation device 1, the amount of wastewater to be treated per hour, and the like.

In this case, by adjusting the water level of the drain region T of the plurality of carrier separation apparatuses 1, the screen 2 of each carrier separation apparatus 1 passes through the screen 2 and flows into the drain region T from the treatment tank 5. The inflow quantity adjustment mechanism 50 which adjusts the quantity of waste water can be provided.

Thereby, the load of each carrier separation apparatus 1 can be made uniform.

This inflow-water adjustment mechanism 50 adjusts the quantity of wastewater which flows in through the screen 2 and flows into the drainage area T of the carrier separation apparatus 1 from the inside of the processing tank 5, as shown in FIG. In this embodiment, the configuration is not limited, but in this embodiment, as shown in FIG. 4, an upper surface of the waste water tank 51, which is connected to the outlet 5B in the carrier separation device 1, is opened. ) And a partition plate 52 provided on the side wall 51a of the waste water container 51 so as to be movable up and down by a fastening means such as a bolt through a long hole, and an upper edge of the partition plate 52. It is comprised so that the water level of the drainage area | region T of the carrier separation apparatus 1 can be changed by changing the position of the part 52a in the up-down direction.

In addition, the carrier separation device 1 includes a gas ejection mechanism composed of a trough 30 which is opened downward so that gas supplied from a gas supply source (not shown) disposed below the screen 2 can be stored ( 3), the separation surface of the screen 2, which induces the gas ejected from the gas blowing portion 30A formed in the trough 30 to rise along the separation surface 2A of the screen 2 ( It is comprised so that the back surface of 2A) may be received in order by the several plate-shaped gas guide plate 4 arrange | positioned inclined upward toward the separation surface 2A side at intervals in the up-down direction.

Thereby, the gas for washing | cleaning which wash | cleans the screen 2 is once stored in the trough 30 which opened downward, and can blow out toward the screen 2, and the whole surface of the screen 2 is uniform. (It can be wash | cleaned uniformly in the width direction of the screen 2), and since the lower side of the trough 30 is open | released, the fall of the cleaning effect of screen cleaning by clogging etc. does not arise.

The separation surface 2A of the screen 2 is a wire rod or rod-shaped body, in this embodiment, a wire rod, for example, a wire, and a distance at which the carrier C does not pass the wire (for example, It is configured by arranging a plurality of sides in a longitudinal direction with respect to a carrier made of a cube of about 3 mm with an interval of about 1.5 mm).

In addition, in the present embodiment, the gas guide plate 4 provided on the rear surface of the separation surface 2A of the screen 2 ensures the spacing and strength of the wires. In addition, a plurality of reinforcing members such as stays having dimensions substantially the same as the width dimension of the screen 2 may be arranged in the vertical direction.

As shown in Fig. 3, the screen 2 is inclined at 10 to 30 ° with respect to the vertical line, preferably at about 15 ° so that the separation surface 2A is obliquely downward, and the two sides are faced to face each other. I'm trying to place it.

As shown in FIGS. 5 to 7, the gas blowing mechanism 3 opens downwards, partition walls 31 along the separation surface 2A of the screen 2, partition walls 32 on the upper surface, Opposite the partition wall 31, the other end side consists of the partition wall 33 to which one end side of the gas supply pipe 35 connected with a gas supply source (not shown) is connected, and the partition walls 34 and 34 of the side surface. do.

And 30A of gas blowing parts of this gas blowing mechanism 3 are arrange | positioned along 2 A of separation surfaces of the screen 2, as shown to FIG. 5 (a)-FIG. 5 (b). What constitutes the lower edge 31a of the partition wall 31 of one trough 30, More specifically, the lower edge 31a of the partition wall 31 used as a gas blowing part is located above another part. It can be formed to.

Thereby, the gas which exceeded the capacity | capacitance of the gas which can be stored in the trough 30 is ejected toward the whole surface of the screen 2 as a gas for washing | sequence sequentially by the action of a head pressure.

Moreover, 30 A of gas blowing parts can be comprised with the gas blowing port formed in the partition wall of the trough 30. FIG.

Although the partition wall which forms a gas blowing port may be formed among the partition walls of five surfaces of the trough 30 which opened downward, in this embodiment, it is shown to FIG.6 (c) and FIG.7 (c). As described above, the plurality of small holes 32a and 36a are formed in the partition wall 32 on the upper surface over the entire width direction area of the screen 2.

In addition to forming small holes as in the present embodiment, the gas blowing holes may be formed as long holes having a slit shape.

In addition, the gas ejection openings constituting the gas ejection section 30A have a slit shape on the partition wall 32 on the upper surface of the trough 30 as shown in FIGS. 6A to 6C. On the partition wall 32, the board | plate material 36 which opened the elongate hole 32b and drilled the many small hole 36a which becomes a gas ejection opening in the position corresponding to this elongate hole 32b, etc. It can be made to replace | position by a fastening means.

Thereby, by replacing the different diameters and / or different numbers of small holes 36a with the perforated plate 36, according to the head pressure generated by the depth of water where the trough 30 is located, a good cleaning gas is produced. It can be adjusted to eject.

In addition, as shown in Figs. 7A to 7C, a gas ejection opening formed of a plurality of small holes 32a is formed in the partition wall 32 on the upper surface, and the screen 2 The gas is blown out from the lower edge 31a of the partition wall 31 along the separation surface 2A, so that even if a blockage occurs in the small hole 32a as the gas blowing port formed in the partition wall 32 on the upper surface, The gas is blown out from the lower edge 31a of the partition wall 31 so that the gas is not cut off in the middle, and the worker cleans the small hole 32a as the gas blowing port and manually cleans the screen 2 itself. The number of times can be greatly reduced.

In addition, the carrier separation device 1 includes a guide plate 10 in parallel with the separation surface 2A of the screen 2, and is treated wastewater between the separation surface 2A and the guide plate 10. The flow path 11 through which flows is formed.

Next, the procedure for treating wastewater in this wastewater treatment facility P will be described.

In this wastewater treatment facility P, the wastewater introduced into the treatment tank 5 from the inlet port 5A is connected to a gas supply source (not shown) disposed below the treatment tank 5 via a pipe 6A. The gas (aeration air) from the apparatus 6 is subjected to nitrogenization by contacting the carrier C having immobilized microorganisms in an aerobic state.

And it flows into the flow path 11 formed between the separating surface 2A of the screen 2 and the guide plate 10 by the predetermined | prescribed water flow (orbital flow) generate | occur | produced in the processing tank 5 by aeration air. And the carrier C in the treatment tank 5 swings in a swirl flow to prevent discharge of the treatment tank 5 out of the treatment tank 5 by means of the separating surface 2A of the screen 2, while only the discharged waste water 5B is discharged. ) To the next process.

At this time, the separation surface 2A of both screens 2 such that the screen 2 of the carrier separation device 1 forms a common drainage area T which leads the two screens 2 to the outlet 5B. By arranging the back side of the screen to face each other, the swirl flow generated by the gas (aeration air) supplied from the air diffuser 6 with respect to the two separation surfaces 2A and 2A of the screen 2 is short. It turns into two swirl flows, the water flow in the processing tank 5 is stabilized, and the supply amount of aeration air can be reduced.

In addition, by supporting the carrier separation device 1 with the support legs 12 freestanding from the bottom of the treatment tank 5, the carrier separation device 1 can be free-standing in the treatment tank 5, thereby providing civil engineering work. The intensity | strength burden of the processing tank 5 which is a structure can be suppressed to the minimum.

Then, through the gas supply pipe 35 from the gas supply source, a small hole in which the cleaning gas A stored in the trough 30 is stored as a gas ejection port formed in the partition wall 32 on the upper surface ( Screen cleaning is carried out from 32a as a uniform microbubble in the entire width direction of the screen 2, taken in by the gas guide plate 4 sequentially, and rising along the separation surface 2A of the screen 2. Is carried out to clean fibrous objects such as human hair entangled in the screen 2.

At this time, even if clogging occurs in the small hole 32a serving as the gas ejection port, the bottom of the trough 30 is opened, and the gas A is ejected from the lower edge 31a of the partition wall 31, thereby causing the Ejection is not cut off in the middle, and the fall of the washing | cleaning effect by clogging can be suppressed to the minimum.

As mentioned above, although the wastewater treatment facility of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, A structure can be changed suitably in the range which does not deviate from the meaning. will be.

The wastewater treatment facility of the present invention can stabilize the flow of water in the treatment tank, reduce the amount of aeration air, minimize the strength burden of the treatment tank, which is a civil engineering structure, and nitrogenize the wastewater to send to the next step. Since it has the characteristic to make it, it can use suitably as a waste water treatment facility of a carrier addition system.

A gas
C carrier
P wastewater treatment equipment
1 carrier separation device
12 support legs
2 screen
2A separation surface
3 gas blowing mechanism
30 trough
30 A gas outlet
4 gas induction plate
5 treatment tanks
5A inlet
5B outlet
50 flow rate adjustment mechanism
51 Waste Water Bottle
51a sidewall
52 compartments
52a upper edge
6 diffuser device

Claims (8)

A treatment tank for biological treatment by contacting the wastewater introduced from the inlet with a carrier immobilized with microorganisms, an air dispersing device for generating swirl flow and supplying oxygen to the wastewater in the treatment tank, and a wire or rod-shaped body formed in parallel In a wastewater treatment facility comprising a screen separation device provided with a screen and inclined so that the separation surface of the screen is obliquely downward, and disposed upstream of the outlet of the treatment tank, the screen of the carrier separation device comprises two screens. And the back side of the separation surface of both screens is disposed so as to form a common drainage area leading to the outlet, and the carrier separation device having the screen is supported by a support leg self-supporting from the bottom of the treatment tank. The waste water treatment facility characterized by the above-mentioned. The gas carrier mechanism according to claim 1, wherein the carrier separation device comprises a gas blowing mechanism composed of a trough opened downward to allow storage of gas supplied from a gas source disposed below the screen, and formed in the trough. A plurality of plate-shaped gases arranged on the rear surface of the separation surface of the screen, which is guided to rise along the separation surface of the screen, to be inclined upward toward the separation surface side, spaced in the vertical direction, to guide the gas blown out from the blowing portion. A waste water treatment facility, characterized in that the guide plate is sequentially accepted. The waste water treatment facility according to claim 1 or 2, wherein the carrier separation device is supported by a support leg. The waste water treatment facility according to claim 1 or 2, wherein the plurality of carrier separation devices are arranged in series. The waste water amount adjusting mechanism according to claim 4, further comprising an inflow quantity adjusting mechanism for adjusting the amount of wastewater flowing into each of the plurality of carrier separation apparatuses into the drainage region. Processing equipment. The separation device according to claim 2, wherein the gas blowing unit is configured with a lower edge of the partition wall of the trough disposed along the separation plane. The separation device according to claim 6, wherein the lower edge of the partition wall of the trough serving as the gas blowing part is formed to be located above the other part. The separation device according to claim 2, wherein the gas blowing unit is configured of a gas blowing port formed in the partition wall of the trough.

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