JP5752612B2 - Wastewater treatment equipment - Google Patents

Description

  The present invention relates to wastewater treatment equipment, and more particularly to improvement of wastewater treatment equipment that biologically treats wastewater by contacting a carrier on which microorganisms are immobilized.

  Conventionally, as a wastewater treatment facility, a treatment tank that biologically treats wastewater flowing in from an inflow port by contacting a carrier on which microorganisms are immobilized, and a swirl flow is generated in the wastewater in the treatment tank and oxygen is generated. And a screen configured by arranging wire rods or rods in parallel, and the screen separation surface is inclined obliquely downward and arranged at the upstream portion of the processing tank outlet and processed. A carrier addition system comprising a carrier separation device that prevents the carrier from being discharged out of the treatment tank together with waste water is widely used.

  The carrier separation device is configured to have a gas blowing mechanism disposed below the screen, and a gas blown from the gas blowing mechanism for guiding the gas blown up along the separation surface of the screen. And a plurality of plate-like gas guide plates arranged at an interval in the direction and inclined upward toward the separation surface side, and a guide plate in parallel with the separation surface of the screen. A flow path through which the treated wastewater flows is formed between the plates (for example, see Patent Document 1).

  In this carrier addition type wastewater treatment facility, the wastewater that has flowed into the treatment tank is fixed with microorganisms by gas (oxygen as aeration air) from a diffuser disposed below the treatment tank. Nitrified by contact with the aerated carrier in an aerobic state, and flows into a flow path formed between the separation surface and the guide plate by a predetermined water flow (swirl flow) generated by aeration air in the treatment tank While the carrier in the tank is prevented from being discharged out of the processing tank by the separation surface of the screen, it is sent from the outlet to the next process as processed waste water.

  In addition, by raising the gas blown from the gas blowing mechanism disposed below the screen along the separation surface of the screen by the gas induction plate, fibrous materials such as human hair floating in the treatment tank can be obtained. The screen is prevented from being entangled with the screen, or the entangled fibrous material is peeled off (hereinafter referred to as screen cleaning).

  By the way, in this kind of wastewater treatment equipment, the entire aeration system is often adopted, and in the carrier separation device having only one screen, the swirl flow in the treatment tank generated by the aeration air is generated in the entire treatment tank. Therefore, there is a problem that the water flow tends to be unstable, and it is necessary to increase the supply amount of aeration air in order to stabilize the water flow.

  In addition, since the carrier separation device, which is a mechanical structure, is attached to the wall surface of the processing tank, which is a civil engineering structure, it is necessary to increase the strength of the processing tank, which is a civil engineering structure, which increases equipment costs. There was a problem.

  Furthermore, the gas blowing structure from the gas blowing mechanism provided in the carrier separation device has a structure in which a large number of fine holes through which gas blows out to a closed part such as a pipe connected to the gas supply source, so that it is maintained and managed. When the gas blowing is stopped at the time of, etc., the waste water in the treatment tank flows backward from the fine holes into the pipe, and this is repeated to clog the fine holes, and the cleaning effect of the screen cleaning is significantly reduced. In addition, depending on the distance from the gas supply source, the amount of gas blown out from the fine holes is not uniform, and it is difficult to efficiently clean the entire screen.

JP 2004-148154 A

  In view of the problems of the above-described conventional wastewater treatment facilities, the present invention stabilizes the water flow in the treatment tank, reduces the supply amount of aeration air, and minimizes the burden on the strength of the treatment tank, which is a civil engineering structure. The purpose is to suppress it.

In order to achieve the above object, the wastewater treatment facility of the present invention comprises a treatment tank for biological treatment by bringing a carrier on which microorganisms are immobilized into contact with wastewater flowing in from an inlet, and wastewater in the treatment tank. An aeration device for generating a swirling flow and supplying oxygen and a screen configured by arranging wire rods or rods in parallel are inclined so that the separation surface of the screen is inclined downward, and the outlet of the treatment tank In a wastewater treatment facility comprising a carrier separation device arranged upstream, both screens of the carrier separation device are formed so that a common drainage area connecting the two screens to the outlet is formed. together with formed by arranged opposed to the back side of the separation surface, so as to support by the support leg is free-standing carrier separation apparatus equipped with the screen from the bottom of the processing tank, further, the responsible The separation device includes a gas blowing mechanism composed of a trough opened at the lower side so that gas supplied from a gas supply source disposed below the screen can be stored, and blown out from a gas blowing portion formed in the trough A plurality of gasses, which are guided to rise along the separation surface of the screen, and are inclined upwardly toward the separation surface side with a space in the vertical direction on the back surface of the separation surface of the screen. The plate-shaped gas induction plate can be sequentially received .

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

  Further, in this case, an inflow water amount adjusting mechanism for adjusting the amount of waste water flowing into the drainage area from each carrier separation apparatus by adjusting the water level in the drainage area of the plurality of carrier separation apparatuses may be provided. it can.

According to the wastewater treatment facility of the present invention, a treatment tank for biologically treating a wastewater flowing in from an inflow port by contacting a carrier on which microorganisms are immobilized, and a swirl flow are generated in the wastewater in the treatment tank. In addition, an oxygen diffuser for supplying oxygen and a screen configured by arranging wire rods or rods in parallel are disposed upstream of the outlet of the treatment tank so that the separation surface of the screen is inclined obliquely downward. 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 that a common drainage area connected to the outlet is formed. The two screens are self-supporting in a V-shape in the processing tank by arranging the support separating apparatus provided with the screen by supporting legs that are self-supporting from the bottom of the processing tank. Since the swirl flow generated by the gas (aeration air) supplied from the diffuser to the two separation surfaces of the screen becomes two short swirl flows, the water flow in the treatment tank is stabilized, The supply amount of aeration air can be reduced.
Moreover, the strength burden of the processing tank which is a civil engineering structure can be minimized by making the carrier separation device stand alone in the processing tank.

The carrier separation device includes a gas blowing mechanism configured of a trough having an open lower portion that can store gas supplied from a gas supply source disposed below the screen, and the gas formed in the trough The gas blown out from the blowout part is guided to rise along the separation surface of the screen, and the back surface of the separation surface of the screen is vertically spaced and inclined upward toward the separation surface side. By allowing the plurality of plate-like gas guide plates to be sequentially received, the cleaning gas for cleaning the screen is temporarily stored in a trough that is open at the bottom and then blown out toward the screen. And the entire screen can be washed uniformly (uniformly in the width direction of the screen) and the lower part of the trough is open, Never lowering of the cleaning effect of the screen-cleaning is caused by the clogging.

  Moreover, the treatment efficiency of waste water can be improved by arranging a plurality of the carrier separation devices in series.

  Further, in this case, each carrier separation device is provided with an inflowing water amount adjusting mechanism that adjusts the amount of wastewater flowing into each drainage region from each carrier separation device by adjusting the water level of the drainage region of the plurality of carrier separation devices. The load on the apparatus can be made uniform.

It is a cross-sectional front view of a partially cutaway showing one embodiment of the wastewater treatment facility of the present invention. The processing equipment of the waste water is shown, (a) is a partially cutaway plan view, (b) is a partially cutaway sectional side view. It is a partially cutaway front view showing the carrier separation device of the wastewater treatment facility. The inflow water amount adjustment mechanism of the carrier separation device is shown, (a) is a front view of a partially cut section, and (b) is a side view of a partially cut section. The gas blowing mechanism of the carrier separation device is shown, (a) is a front sectional view showing an example in which the gas blowing portion is configured by the lower edge of the trough partition wall arranged along the separation surface of the screen, (b) It is the same top view. Another structural example of the gas blowing mechanism is shown, (a) is a front sectional view showing an example in which a gas blowing portion is formed by a gas blowing port formed on a partition wall of a trough, (b) is a plan view, (c) ) Is an enlarged view of the main part. An example of another configuration of the gas blowing mechanism is shown, in which (a) is an example in which the gas blowing portion is constituted by a gas blowing port composed of a large number of small holes in the upper partition wall and a lower edge of the partition wall along the separation surface of the screen. (B) is the same top view, (c) is the principal part enlarged view.

  Hereinafter, embodiments of the separation apparatus of the present invention will be described with reference to the drawings.

1 to 7 show an embodiment of the wastewater treatment facility of the present invention.
The wastewater treatment facility P generates a swirl flow in the wastewater in the treatment tank 5 and the wastewater in the treatment tank 5 in which the carrier C on which microorganisms are immobilized is brought into contact with the wastewater flowing in from the inlet 5A. In addition, an air diffuser 6 for supplying oxygen and a screen 2 configured by arranging wire rods or rods in parallel are inclined so that the separation surface 2A of the screen 2 is obliquely downward, and the outlet 5B of the treatment tank 5 is provided. Both screens are formed such that the screen 2 of the carrier separation device 1 is arranged in the upstream portion, and the screen 2 of the carrier separation device 1 forms the common drainage area T connecting the two screens 2 to the outlet 5B. The back surfaces of the two and two separation surfaces 2A and 2A are arranged facing each other, and the carrier separation device 1 provided with the screen 2 is supported by support legs 12 that are self-supporting from the bottom surface of the processing tank 5. Yes.

  As described above, this wastewater treatment facility P is an example of a carrier addition type facility that biologically treats (mainly nitrification) the wastewater by contacting the carrier C on which the microorganisms are immobilized in the treatment tank 5. The carrier separation device 1 will be described with reference to the use of separating the treated wastewater and the carrier C, but is not limited to this, and can be used as equipment for use in separating impurities contained in the wastewater.

  The support legs 12 that support the carrier separating apparatus 1 can support the carrier separating apparatus 1 as long as the support separating apparatus 1 is self-supporting in the processing tank 5 and minimizes the strength burden on the processing tank 5 that is a civil engineering structure. There are no particular restrictions on the position at which the separation device 1 is supported, the number of attachments, and the like. 1-2, and as shown in FIGS. 1 to 2, a plurality of support legs 12 are disposed so as to be paired when viewed from the front and when viewed from the side. In particular, a sufficient distance can be maintained between the pair of support legs 12 when viewed from the front, so that the carrier separating apparatus 1 can be stably supported.

In addition, by disposing a plurality of carrier separation devices 1 in series in the treatment tank 5 of the wastewater treatment facility P, the treatment efficiency of wastewater can be improved.
In the present embodiment, a total of four carrier separation devices 1 are arranged two by two (configured so that one side surface of two carrier separation devices 1 are bonded or shared). The number of arrangements is appropriately determined according to the volume of the treatment tank 5, the surface area of the screen 2 of the carrier separation device 1, the amount of waste water to be treated per hour, and the like.

In this case, the amount of waste water flowing from the treatment tank 5 into the drainage area T through the screen 2 of each carrier separation apparatus 1 is adjusted by adjusting the water level of the drainage areas T of the plurality of carrier separation apparatuses 1. An inflow water amount adjusting mechanism 50 to be adjusted can be provided.
Thereby, the load of each carrier separation apparatus 1 can be made uniform.

  As shown in FIG. 4, the inflowing water amount adjusting mechanism 50 is configured to be able to adjust the amount of wastewater that passes through the screen 2 and flows into the drainage area T of the carrier separation device 1 from the processing tank 5. However, in this embodiment, as shown in FIG. 4, the waste water tank having an open upper surface connected to the outlet 5 </ b> B in the carrier separation device 1 is used. 51 and a partition plate 52 attached to the side wall 51a of the waste water tank 51 by a fastening means such as a bolt through a long hole so as to move up and down, and in the vertical direction of the upper edge portion 52a of the partition plate 52 By changing the position, the water level of the drainage area T of the carrier separator 1 can be changed.

Further, the carrier separating apparatus 1 includes a gas blowing mechanism 3 including a trough 30 that is open at the bottom so that gas supplied from a gas supply source (not shown) disposed below the screen 2 can be stored. The gas blown out from the gas blowing section 30A formed in the trough 30 is guided to rise along the separation surface 2A of the screen 2, and the back surface of the separation surface 2A of the screen 2 is spaced vertically. Thus, the plurality of plate-like gas guide plates 4 are arranged so as to be inclined upward toward the separation surface 2A side.
As a result, the cleaning gas for cleaning the screen 2 can be temporarily stored in the trough 30 opened at the lower side and then blown out toward the screen 2, so that the entire surface of the screen 2 is uniform (the width of the screen 2 Can be cleaned uniformly in the direction), and the lower portion of the trough 30 is open, so that the cleaning effect of the screen cleaning due to clogging or the like does not deteriorate.

The separation surface 2A of the screen 2 uses a wire or a rod-like body, in this embodiment, a wire, for example, a wire, and an interval at which the carrier C does not pass through the wire (for example, a carrier made of a cube having a side of about 3 mm). On the other hand, a large number are arranged in the vertical direction with an interval of about 1.5 mm).
In this embodiment, the gas guide plate 4 provided on the back surface of the separation surface 2A of the screen 2 secures the spacing and strength of the wires. For securing the spacing and strength of the wires, separately, A plurality of reinforcing members such as stays having substantially the same dimensions as the width of the screen 2 can be arranged in the vertical direction.

  As shown in FIG. 3, two screens 2 are inclined at 10 to 30 °, preferably about 15 ° with respect to the vertical line so that the separation surface 2A is obliquely downward, with the back side facing each other. It is arranged.

  As shown in FIGS. 5 to 7, the gas blowing mechanism 3 opens downward and faces the partition wall 31 along the separation surface 2 </ b> A of the screen 2, the partition wall 32 on the upper surface, the partition wall 31, and the other end side is a gas. It comprises a partition wall 33 to which one end of a gas supply pipe 35 connected to a supply source (not shown) is connected, and side partition walls 34 and 34.

  And the gas blowing part 30A of this gas blowing mechanism 3 is below the partition wall 31 of the trough 30 arrange | positioned along the separation surface 2A of the screen 2, as shown to Fig.5 (a)-FIG.5 (b). More specifically, the lower edge 31a of the partition wall 31 serving as the gas blowing portion can be formed so as to be positioned above other portions.

  As a result, the gas exceeding the capacity of the gas that can be stored in the trough 30 is sequentially blown out toward the entire surface of the screen 2 as a cleaning gas by the action of the water head pressure.

Further, the gas blowing portion 30 </ b> A can be configured by a gas blowing port formed on the partition wall of the trough 30.
The partition wall that forms the gas outlet may be formed on any of the five partition walls of the trough 30 that opens downward. In this embodiment, FIG. 6 (c) and FIG. 7 (c). As shown in FIG. 5, the small partition walls 32a and 36a are formed in the partition wall 32 on the upper surface over the entire width direction of the screen 2.
The gas outlet can be formed as a slit-like long hole in addition to the small hole as in this embodiment.

Moreover, as shown in FIGS. 6 (a) to 6 (c), the gas blowing port constituting the gas blowing unit 30A opens a slit-like long hole 32b in the partition wall 32 on the upper surface of the trough 30, and this A plate member 36 having a large number of small holes 36a serving as gas blowing ports can be disposed on the partition wall 32 in a position corresponding to the long holes 32b so as to be replaceable by fastening means such as bolts.
Thus, by replacing the plate 36 with a different diameter and / or different number of small holes 36a, adjustment is performed so that a good cleaning gas is blown out according to the water head pressure generated by the water depth at which the trough 30 is located. be able to.

  Further, as shown in FIGS. 7A to 7C, a gas blowing port composed of a large number of small holes 32 a is formed in the upper partition wall 32, and the partition wall 31 along the separation surface 2 </ b> A of the screen 2. The gas is blown out from the lower edge 31a of the partition wall 31 even if clogging occurs in the small hole 32a as the gas outlet formed in the upper partition wall 32 by configuring the gas to blow out from the lower edge 31a of the upper wall. Thus, the gas blowing is not interrupted, and the number of times of cleaning the small holes 32a as the gas blowing ports by the operator and the manual cleaning of the screen 2 itself can be greatly reduced.

  The carrier separating apparatus 1 includes a guide plate 10 in parallel with the separation surface 2A of the screen 2, and forms a flow path 11 through which the treated waste water flows between the separation surface 2A and the guide plate 10. ing.

Next, a procedure for treating wastewater in the wastewater treatment facility P will be described.
In this wastewater treatment facility P, wastewater that has flowed into the treatment tank 5 from the inlet 5A is connected to a gas supply source (not shown) disposed below the treatment tank 5 via a pipe 6A. The gas from the apparatus 6 (aerated air) is subjected to nitrification treatment by contacting the carrier C on which microorganisms are immobilized in an aerobic state.
Then, a predetermined water flow (swirl flow) generated by aeration air in the processing tank 5 flows into the flow path 11 formed between the separation surface 2A of the screen 2 and the guide plate 10, and the carrier C in the processing tank 5 While being swirled on the swirl flow and prevented from being discharged out of the treatment tank 5 by the separation surface 2A of the screen 2, only the treated waste water is sent from the outlet 5B to the next step.

At this time, the screen 2 of the carrier separating apparatus 1 arranges the two screens 2 so that the back sides of the separation surfaces 2A of both screens 2 face each other so as to form a common drainage area T connected to the outlet 5B. Thus, 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 becomes two short swirl flows, and the water flow in the treatment tank 5 is reduced. It is stable and the supply amount of aeration air can be reduced.
In addition, since the carrier separating apparatus 1 is supported by the support legs 12 that are self-supported from the bottom surface of the processing tank 5, the carrier separating apparatus 1 can be self-supported in the processing tank 5, and the processing is a civil engineering structure. The strength burden on the tank 5 can be minimized.

Then, the cleaning gas A stored in the trough 30 with a constant water head pressure from the gas supply source via the gas supply pipe 35 is a small gas outlet that is formed in the partition wall 32 on the upper surface. A uniform fine bubble is blown out from the hole 32a in the entire width direction of the screen 2, sequentially received by the gas guide plate 4, and moved up along the separation surface 2A of the screen 2 to perform screen cleaning. Clean up tangled human hair and other fibrous materials.
At this time, even if clogging occurs in the small hole 32a serving as the gas outlet, the lower portion of the trough 30 is opened, and the gas A is blown out from the lower edge 31a of the partition wall 31 so that the gas A is interrupted. In other words, the deterioration of the cleaning effect due to clogging can be minimized.

  As mentioned above, although the wastewater treatment facility of the present invention has been described based on the embodiments, the present invention is not limited to the configurations described in the above embodiments, and the configurations are appropriately changed without departing from the gist thereof. Is something that can be done.

  The wastewater treatment facility of the present invention stabilizes the water flow in the treatment tank, reduces the supply amount of aeration air, minimizes the strength burden of the treatment tank, which is a civil engineering structure, and nitrifies the wastewater. Since it has the characteristic that it can be sent to a process, it can be suitably used as a wastewater treatment facility of a carrier addition method.

A Gas C Carrier P Wastewater Treatment Equipment 1 Carrier Separation Device 12 Support Leg 2 Screen 2A Separation Surface 3 Gas Blowing Mechanism 30 Trough 30A Gas Blowing Port 4 Gas Induction Plate 5 Treatment Tank 5A Inlet 5B Outlet 50 Inflow Water Amount Adjustment Mechanism 51 Wastewater basin 51a Side wall 52 Partition plate 52a Upper edge 6 Air diffuser

Claims (3)

A treatment tank for biological treatment by bringing a carrier on which microorganisms are immobilized into contact with wastewater flowing in from an inflow port; a diffuser for generating a swirling flow in the wastewater in the treatment tank and supplying oxygen; and a wire rod Or a waste water comprising a carrier separation device provided with a screen configured by arranging rod-shaped bodies in parallel, and inclined at the upstream side of the outlet of the treatment tank so that the separation surface of the screen is inclined downward. In the treatment facility, the screen of the carrier separation device is formed by arranging the two screens so that the back side of the separation surface of both screens faces each other so that a common drainage area connected to the outflow port is formed. so as to support by the support leg is free-standing carrier separation apparatus equipped with the screen from the bottom of the processing tank, further, the carrier separation device, a gas supply source which is arranged below the screen A gas blowing mechanism composed of a trough open at the bottom that allows the supplied gas to be stored, and the gas blown out from the gas blowing portion formed in the trough rises along the separation surface of the screen It is designed to be received sequentially by a plurality of plate-like gas induction plates arranged on the back surface of the separation surface of the screen with an interval in the vertical direction and inclined upward toward the separation surface side . Wastewater treatment facility characterized by that. The carrier separation unit, treatment facilities wastewater claim 1 Symbol mounting is characterized in that so as to disposed in multiple series. 3. An inflow water amount adjusting mechanism for adjusting the amount of waste water flowing from each of the carrier separation devices into the drainage region by adjusting a water level in the drainage region of the plurality of carrier separation devices. The wastewater treatment facility described.

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