KR20180116649A - Contact oxidation wastewater treatment apparatuse capable of squeezing separation - Google Patents

Abstract

The present invention relates to a contact oxidation type wastewater treatment apparatus capable of pressing separation. More specifically, the apparatus includes: an aeration part supplying oxygen to inflow wastewater for making a reaction; a contact oxidation part including a filter medium, adsorbing microorganisms from treated water treated through the aeration part, and making sludge treated with the adsorbed microorganisms; a precipitation part precipitating the sludge included in the treated water treated through the contact oxidation part; and a pressing unit installed in the contact oxidation part to separate and discharge the sludge and the microorganisms by pressing the filter medium. According to the present invention, since high concentration wastewater is treated with oxygen supply but the filter medium is used before the precipitation of sludge to grow contact microorganisms, the sludge is treated, while the filter medium is separated with pressure to prevent the excessive attachment of the microorganisms in order to maintain the concentration of a proper amount of attached microorganisms, and thus, the present invention is capable of improving the efficiency of treatment as well as extending the lifespan of the filter medium by making an excellent response to shock loading and increasing the period of using the filter medium.

Description

Technical Field [0001] The present invention relates to a contact oxidation wastewater treatment apparatus capable of squeezing separation,

The present invention relates to a wastewater treatment apparatus, and more particularly, to a wastewater treatment apparatus that treats wastewater by supplying oxygen, treating high concentration wastewater by using a floating microorganism and a contact microorganism, It is possible to maintain an appropriate amount of adherent microorganism to improve the treatment efficiency as well as to improve the treatment efficiency of the contact oxidation wastewater which is excellent in response to shock loading, Processing apparatus.

Generally, activated sludge method using microorganisms, anaerobic digestion method, physical chemical treatment method, and the like have been popularized as methods for treating wastewater such as living wastewater, livestock wastewater, industrial wastewater and the like, and activated sludge method using microorganisms is popularized.

In the conventional wastewater treatment apparatus using microorganisms, as disclosed in the registration room No. 20-0315908, an aeration tank is provided in the aeration tank, and a wire mesh is formed in the middle portion in which a plurality of filter media are randomly filled.

The wastewater is reacted while passing through a plurality of filter media. In this process, sludge containing microbial mass is generated and positioned, and air is blown out by the air lift blowing machine to remove the sludge.

However, it is difficult to uniformly spray the air between the filter media provided in the wire mesh, and the jetted air can not be supplied to the entire filter media, thereby causing the sludge to be partially removed.

In order to solve this problem, although the air blowing pressure is increased, the sludge at the portion where the air is blown off is easily removed, but the sludge is not removed still at the other portion, and the filter material is damaged by the high pressure air.

As a result, not only the efficiency of wastewater treatment is improved but also the sludge of the whole filter material is easily removed, so that the treatment efficiency can be further improved, the filter material can be easily cleaned, This is a desperate need.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a wastewater treatment apparatus that has an aeration section and a filter medium for supplying oxygen to an incoming wastewater for reaction, A contact portion for filtering the sludge by the microorganism, a precipitating portion for inducing the sludge contained in the treated water treated in the contact oxidizing portion, and an adsorbent for adsorbing the attached microorganism Wherein the sludge is treated with high concentration wastewater by supplying oxygen to the sludge, and the sludge is treated with a filtering material before the sediment separation of the sludge, The adhesive material can be squeezed and desorbed to maintain an appropriate amount of the attached microorganism Improving the process efficiency as well as control, it is an object to provide an impact load (Shock Loading) in responsiveness is excellent and media service life increased by a possible compression desorption which can extend the life of catalytic oxidation formula wastewater treatment apparatus.

In order to accomplish the above object, the present invention provides a sludge treatment apparatus having an aeration section and a filter medium for supplying oxygen to an incoming wastewater and reacting therewith, the sludge being adhered to the sludge by microorganisms attached thereto, A sedimentation section for precipitating sludge contained in the treated water treated in the contact oxidation section and a sedimentation section provided in the contact oxidation section to squeeze the sludge and the microorganism to be discharged And a pressing means for applying a pressing force.

Preferably, the aeration portion includes an aeration tank having a first reaction space portion therein, and an oxygen supply portion for supplying oxygen to the first reaction space portion of the aeration tank.

The oxygen supply unit may include an oxygen supply pipe provided at a lower end of the first reaction space, an oxygen supply pump for supplying oxygen to the oxygen supply pipe, and a plurality of oxygen supply pipes provided in the oxygen supply pipe, And an oxygen nozzle for supplying oxygen.

The contact oxidation unit may include an oxidizing tank having a second reaction space part therein, a first inlet part for supplying the treated water subjected to the primary treatment in the aeration tank to the lower end of the second reaction space part, Wherein the sludge is introduced into the first reaction space through the first inlet part and the treatment water flowing through the first inlet part passes through the first reaction part, And a first discharge unit for moving the sediment to the sediment.

The first inlet portion may include a first inlet pipe provided at a lower end of the second reaction space portion, a first inlet pump for supplying treated water of the first reaction space portion to the first inlet pipe, And a first inflow nozzle provided in the pipe for spraying the supplied process water.

Further, the filter material is formed of a plurality of fiber yarns, and each fiber yarn is formed by twisting at least two fiber yarns.

The pressing means includes a pressing base frame provided in the second reaction space portion of the oxidation tank and a plurality of upper grating holes. The upper grating is provided at the upper end of the pressing base frame, A plurality of lower gratings provided at a lower end of the compression base frame so as to have the plurality of lower grating holes and a plurality of filter media provided by moving at least one of the upper grating and the lower grating, A squeezing unit for squeezing out the microorganisms and the sludge contained in the filtering medium, and a squeezing and discharging unit provided below the lower grating for discharging microbes and sludge squeezed by the squeezing unit.

The compression bonding unit may include: a compression and fixing frame provided at a predetermined distance apart from the compression base frame; a plurality of compression supports for fixing the compression and fixing frame to the compression base frame; A crushing block provided on the crushing fixed frame and having a thread along the outer periphery of the crushing block, the crushing rotary bar being located at a fixing hole of the crushing block and having a lower end rotatable in the upper grating, , ≪ / RTI >

The compression bonding unit includes a pair of compression and fixing frames spaced apart from the compression base frame by a predetermined distance, a plurality of compression supports for fixing the compression and fixing frames to the compression base frame, A pair of pressing crimping rods provided so as to be rotatable between the upper and lower gratings and parallel to one side and the other side of the upper grating, a pressing roller provided on each end of each of the crimping crimping rods and rotated in the same manner, And each of the upper ends is connected to a plurality of squeeze wires wound around the respective squeezing rollers, a squeezing operation rotary bar rotatably provided on any one of the squeeze fixing frames, A pressing connection portion for transmitting a rotational force, and a pressing connection portion for rotating the pressing operation rotating bar And a pair of pressing rollers rotating in one direction so that each of the pressing wires is wound around the pressing roller to move the lower grating upward to thereby press the filter media , The pressing handle is rotated in the other direction, the two pressing rollers are rotated in the other direction, and the respective pressing wires wound around the pressing failure are released to move the lower grating downward.

The squeezing and discharging unit may include a squeeze discharge port provided on a bottom surface of the second reaction space below the lower grating and a discharge guide for guiding the microorganisms and sludge desorbed from the filter medium to be moved to the squeeze discharge port .

And a vibration portion capable of applying an impact to the discharge guide.

The sedimentation unit may include a sedimentation tank having a sedimentation space portion therein, a first sedimentation discharge unit for discharging the treated water in which the sludge has been deposited in the sedimentation space, and a second sedimentation unit for discharging the sedimented sludge in the treatment water supplied to the sedimentation space unit And a second sediment discharging portion for discharging the sediment.

And a sludge circulation unit for circulating the sludge discharged from the settling unit to be supplied to the aeration unit.

The sludge circulation unit may include a sludge circulation pipe having one end connected to the second sediment discharge unit and the other end disposed in the aeration unit, and a sludge circulation pump for circulating the sludge discharged through the sludge circulation pipe .

And a pretreatment means for pretreating the wastewater flowing into the aeration tank.

The pretreatment means may include a first storage tank in which wastewater is introduced and subjected to a first pre-treatment, a second storage tank in which a first pre-treated wastewater is subjected to first pre-treatment in the first storage tank, and a second storage tank in which a second pre- And a preprocessing pump for supplying to the aeration section.

As described above, according to the contact oxidation wastewater treatment apparatus capable of squeezing off the sludge according to the present invention, oxygen is supplied to treat the high concentration wastewater, and contact microorganisms are grown using the filter material before sedimentation separation of the sludge, , It is possible to maintain an appropriate amount of the attached microorganism by pressing and squeezing the filtering material so as to prevent the microorganisms from being excessively adhered to thereby improve the treatment efficiency and to provide an excellent response force against shock loading It is a very useful and effective invention which enables to extend the lifetime by increasing the filter material usage period.

1 is a view showing a contact oxidation wastewater treatment apparatus according to the present invention,
2 is a view showing an aeration portion, a contact oxidation portion and a settling portion according to the present invention,
3 is a view showing a pressing means according to the present invention,
4 is a view showing another embodiment of the pressing means according to the present invention,
5 is a view showing a state in which a sludge circulation unit is further provided in the squeeze-type wastewater treatment apparatus according to the present invention,
6 is a view showing a state in which a pretreatment means is further provided in the compressed wastewater treatment apparatus according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

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

Throughout the specification, when an element is referred to as "comprising" or " including ", it is meant that the element does not exclude other elements, do. Further, the term "part" described in the specification means a unit for processing at least one function or operation. Also, the terms " a or ", "one "," the ", and the like are synonyms in the context of describing the invention (particularly in the context of the following claims) May be used in a sense including both singular and plural, unless the context clearly dictates otherwise.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

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

FIG. 1 is a view showing a contact oxidation wastewater treatment apparatus according to the present invention, FIG. 2 is a view showing an aeration section, a contact oxidation section and a settling section according to the present invention, and FIG. 3 is a cross- FIG. 4 is a view showing another embodiment of the compression means according to the present invention, FIG. 5 is a view showing a state in which a sludge circulation unit is further provided in the compressed wastewater treatment apparatus according to the present invention, 6 is a view showing a state in which a pretreatment means is further provided in the compressed wastewater treatment apparatus according to the present invention.

As shown in the drawing, a contact oxidation type wastewater treatment apparatus 10 capable of squeezing off is constituted by an aeration section 100, a contact oxidation section 200, a settling section 300, and a compression section 400.

The vent 100 is provided for supplying oxygen to the incoming wastewater and reacting it.

The contact oxidation unit 200 has a filter medium 230 and is provided with microorganisms adhering to the treated water treated by the aeration unit 100 and treated by the attached microorganisms.

The sedimenting unit 300 is provided to precipitate the sludge included in the treated water secondary-treated in the contact oxidation unit 200.

Also, the pressing means 400 is provided in the contact oxidation unit 200 to remove the microorganisms and sludge which are adhered and excessively grown as the filter material 230 is squeezed.

In other words, the compression means 400 is arranged so that only a static amount of microorganisms is attached so as to prevent the microorganisms from excessively growing in the filter material 230 and preventing the treated water from passing through.

According to the contact oxidation wastewater treatment apparatus 10 capable of performing the squeeze-out, high-concentration wastewater is treated, microorganisms adhere to the filter material 230 to provide a growth site, and as the sludge is treated by the microorganism, .

Here, as the filter media 230 are compressed by the compression unit 400 at intervals of a predetermined period, the microorganisms that are excessively grown or adhered to each other are desorbed, so that the treated water can be easily passed through and the sludge can be treated.

2, the aeration unit 100 includes an aeration tank 110 and an oxygen supply unit 120.

The aeration tank 110 is provided with a first reaction space part 112 and the oxygen supply part 120 is provided to supply oxygen to the first reaction space part 112 of the aeration tank 110.

The oxygen supply unit 120 includes an oxygen supply pipe 122, an oxygen supply pump 124, and an oxygen nozzle 126.

An oxygen supply pipe 122 is provided at the lower end of the first reaction space part 112 and an oxygen supply pump 124 is provided for supplying oxygen to the oxygen supply pipe 122.

A plurality of oxygen nozzles 126 are provided in the oxygen supply pump 124 to inject oxygen supplied thereto.

Thus, oxygen can be uniformly supplied to the entire first reaction space part 112, thereby increasing the amount of dissolved oxygen and improving the primary treatment efficiency.

The contact oxidation unit 200 includes an oxidation tank 210, a first inlet 220, a filter 230, and a first outlet 240.

The oxidation tank 210 is provided with a second reaction space 212 therein and the first inlet 220 is connected to the lower end of the second reaction space 212 in the aeration tank 110, Respectively.

The first inflow pipe 220 is provided at a lower end of the aeration tank 110 and the oxidizing tank 210 so that the treated water can be moved by the hydraulic pressure of the stored wastewater.

The first inlet pipe 222 has one end communicating with the lower end of the first reaction space part 112 of the aeration tank 110 and the other end is provided at the lower end of the second reaction space part 212.

The first inlet 220 is further provided with a first inlet pump 224 and a first inlet nozzle 226.

The first inflow pump 224 is provided to supply the process water of the first reaction space portion 112 to the first inflow pipe 222.

A plurality of first inflow nozzles 226 are provided in the first inflow pipe 222 and are provided for spraying the supplied process water.

The first inflow pump 224 is capable of controlling the supply amount of the treated water. As the first inflow pipe 222 is further provided with a valve, the first inflow pump 224 operates in conjunction with the first inflow pump 222, .

The filter medium 230 is provided in the second reaction space part 212 to allow the treated water flowing through the first inlet part 220 to pass therethrough and adsorb the treated water while adhering the sludge.

This filter material 230 is a plurality of fiber yarns, and each fiber yarn is formed by twisting two or more fiber yarns.

Such a filter medium is composed of a core material formed long in the longitudinal direction and a plurality of wire materials woven along the periphery of the core material in a ring shape.

Of course, it is of course also possible that the fiber seal chamber is formed by twisting a plurality of seal chambers.

The first discharge unit 240 is provided to move the second treated water passing through the filter media 230 to the settling unit 300 through the upper end of the second reaction space unit 212.

3, the pressing means 400 includes a pressing base frame 410, an upper grating 420, a lower grating 430, a pressing portion 440, and a pressing discharge portion 450. As shown in FIG.

The pressing base frame 410 is provided in the second reaction space part 212 of the oxidation tank 210.

The upper grating 420 has a plurality of upper grating holes 422. The upper grating 420 is provided at the upper end of the compression base frame 410 and the upper ends of the plurality of the filter media 230 are installed.

The lower grating 430 has a plurality of lower grating holes 432 and is provided at the lower end of the compression base frame 410 so that the lower ends of the plurality of filter media 230 are installed.

Here, the upper grating 420 and the lower grating 430 may be mesh.

The squeezing unit 440 compresses the plurality of filter media 230 installed by moving at least one of the upper grating 420 and the lower grating 430 so that the microorganisms and sludge attached to the filter media 230 are removed, And discharged.

The crush discharge unit 450 is provided below the lower grating 430 to discharge the microorganisms and the sludge desorbed by the crushing unit 440.

The pressing portion 440 of the embodiment includes a pressing and fixing frame 441 and a pressing support 442, a pressing block 443, a pressing rotation bar 444, and a pressing handle 445.

The pressing and fixing frame 441 is spaced upward from the pressing base frame 410 by a predetermined distance.

A plurality of pressing support frames 442 are provided for fixing the pressing and fixing frames 441 to the pressing base frame 410.

The pressing block 443 has a fixing hole 443a having a screw thread formed on its inner circumferential surface and is provided in the pressing and fixing frame 441.

The pressing rotation bar 444 has a thread along the outer periphery and is disposed in the fixing hole 443a of the compression block 443 and has a lower end rotatable with the upper grating 420.

The pressing handle 445 is provided for rotating the pressing rotation bar 444.

When the pressing rod 444 is rotated by rotating the pressing handle 445 in one direction and rotated by the pressing block 443 to move downward, the upper grating 420 is moved downward, .

In contrast, when the pressing handle 445 is rotated in the other direction, the upper grating 420 is moved upward to return the filter media 230 to the treated water, thereby providing a place where microorganisms can grow, .

4, the pressing portion 440 'of another embodiment includes a pressing and fixing frame 441' and a pressing support 442 ', a pressing and crimping rod 443', a pressing roller 444 ' A crimp wire 445 ', a crimp action rotary bar 446', a crimp connection 447 'and a crimp handle 448'.

The pressing and fixing frames 441 'are provided to be spaced upward from the compression base frame 410 by a predetermined distance.

And a plurality of pressing support brackets 442 'are provided for fixing the respective pressing and fixing frames 441' to the pressing base frame 410.

The compression damper rods 430 'are provided so as to be rotatable between the pair of compression and fixing frames 441', and two pieces are provided so as to be parallel to one side and the other side of the upper grating 420.

Further, the pressing rollers 444 'are provided at the respective ends of the respective crimping crimping rods 443' and rotated in the same manner, and two or more crimping rollers 444 'are provided in the crimping crimping rods 443'.

The lower ends of the compression wires 445 'are fixed to the lower grating 430, and a plurality of upper ends of the compression wires 445' are wound around the respective compression rollers 444 '.

And the pressing operation rotating bar 446 'is rotatably provided in any one of the pressing and fixing frames 441'.

The crimping connection portion 447 'is provided for transmitting the rotational force by connecting the crimping operation rotary bar 446' and the crimping crimping rods 443 ', respectively.

The compression handle 448 'is also provided to rotate the compression action rotary bar 446'.

When the pressing handle 444 is rotated in one direction, the two pressing rollers 443 'are rotated in one direction so that the pressing wires 445' are wound on the pressing roller 444 ' , The filter material is squeezed.

Conversely, when the pressing handle 448 'is rotated in the other direction, the two pressing rollers 443' are rotated in the other direction to release the respective pressing wires 445 'wound on the pressing failure 444' (430) is moved downward.

Thus, as the treated water passes through the filter media 230, the sludge is treated as well as grown, providing a place where microorganisms can grow.

The pressurized discharge portion 450 is composed of a pressurized discharge port 452 and a discharge guide 454.

The squeeze outlet 452 is provided at the bottom of the second reaction space 212, which is below the lower grating 430.

Further, the discharge guide 454 is provided to guide the microorganisms and the sludge desorbed from the filter media 230 to be moved to the squeeze discharge port 452.

This discharge guide 454 is installed as an inclined plate to guide the microorganism and the sludge to the compression discharge port 452.

Here, a vibration portion 456 capable of applying an impact to the discharge guide 454 is further provided so that the sludge can be moved more easily.

The vibrating portion 456 is configured to generate vibration or strike at regular intervals.

The sedimenting unit 300 includes a sedimentation tank 310, a first sediment discharge unit 320, and a second sediment discharge unit 330.

The sedimentation tank 310 is provided with a sedimentation space 312 therein and the first sediment discharge unit 320 is provided for discharging the treated water in which the sludge has settled in the sedimentation space 312.

The second settling discharge part 330 is provided to discharge the settled sludge from the treated water supplied to the settling space part 312.

As shown in FIG. 5, the sludge circulation unit 500 further includes a sludge circulation unit 500 for circulating the sludge discharged from the sedimentation unit 300 to be supplied to the aeration unit 100.

The sludge circulation unit 500 includes a sludge circulation pipe 510 and a sludge circulation pump 520.

One end of the sludge circulation pipe 510 is connected to the second sediment discharge part 330, and the other end is located in the atmospheric air part 100.

The sludge circulation pump 520 is provided to circulate the sludge discharged through the sludge circulation pipe 510.

The sludge circulation unit 500 can circulate the microorganisms and the sludge discharged by the compression unit 400 to the aeration unit 100. The second sludge circulation pump 530 further includes microorganisms and sludge .

At this time, it is natural that sludge or microorganisms and sludge discharged from each constitution include treated water.

As shown in FIG. 6, the apparatus further includes a pretreatment unit 600 for pretreating the wastewater flowing into the aeration tank 100.

The pretreatment means 600 includes a first storage vessel 610, a second storage vessel 620, and a pretreatment pump 630.

The first storage tank 610 receives the wastewater and is subjected to the first pre-treatment, and the second storage tank 620 performs the second pre-treatment of the wastewater subjected to the first pre-treatment in the first storage tank 610.

The pretreatment pump 630 is provided to supply the wastewater, which has been secondly pretreated in the second storage tank 620, to the aeration unit 100.

After the wastewater is pretreated by the preprocessing means 600 and then introduced into the aeration unit 100, the treatment efficiency of the wastewater can be further improved.

10: Compression type wastewater treatment apparatus 100:
200: contact oxidation part 300:
400, 400 ': compression means 500: sludge circulation unit
600: preprocessing means

Claims (10)

A vent portion for supplying oxygen to the incoming wastewater to react;
A contact oxidation unit having a filter material, to which microorganisms are adhered while passing through the treatment water treated by the aeration unit, and sludge is treated by the attached microorganisms;
A sedimentation unit for precipitating sludge contained in the treated water treated in the contact oxidation unit; And
And a squeeze means for desorbing and discharging the adhered sludge and microorganisms as the filter material is provided to the contact oxidation unit. The air conditioner according to claim 1,
An aeration tank having a first reaction space part therein; And
And an oxygen supply part for supplying oxygen to the first reaction space part of the aeration tank. 3. The apparatus according to claim 2,
An oxidation tank having a second reaction space part therein;
A first inlet for supplying treated water, which is first treated in the aeration tank, to a lower end of the second reaction space part;
A filter disposed in the second reaction space part for passing the treated water flowing through the first inlet part and treating the sludge by adhering and growing the microorganisms; And
And a first discharge portion for moving the treated water passing through the filter medium to the settling portion through an upper end of the second reaction space portion. The image forming apparatus according to claim 3,
A compression base frame provided in a second reaction space part of the oxidation tank;
An upper grating having a plurality of upper grating holes, the upper grating being provided at an upper end of the compression base frame, the upper grating having the plurality of filter upper ends;
A lower grating provided at a lower end of the compression base frame to have a plurality of lower grating holes and to have the plurality of lower filter media installed therein;
A squeezing unit for squeezing the plurality of filter media installed by moving at least one of the upper grating and the lower grating, thereby removing the microorganisms and the sludge contained in the filter media; And
And a squeeze discharge unit provided below the lower grating for discharging microbes and sludge squeezed by the squeezing unit. 5. The apparatus according to claim 4,
A compression and fixing frame disposed above the compression base frame and spaced apart from the compression base frame by a predetermined distance;
A plurality of compression supports for fixing the compression fixed frame to the compression base frame;
A compression block provided on the compression fixed frame and having a fixing hole formed with a thread on an inner peripheral surface thereof;
A crushing rotary bar having threads along an outer periphery thereof and positioned at a fixing hole of the compression block and having a lower end rotatably mounted on the upper grating; And
And a pressing handle for rotating the pressing rotary bar. 5. The apparatus according to claim 4,
A pair of compression and fixation frames spaced apart from the compression base frame by a predetermined distance;
A plurality of compression supports for fixing the respective compression and fixing frames to the compression base frame;
Two squeezing chambers provided to be rotatable between the pair of clamping and fixing frames and parallel to one side and the other side of the upper grating;
A pressing roller provided at each end of each of the crimping spurs and rotated in the same manner;
Each of the lower ends being fixed to the lower grating, and the upper ends of the plurality of pressing wires being wound on the respective pressing rollers;
A pressing operation rotating rod rotatably provided on any one of the clamping and fixing frames;
A crimping connection part for connecting the crimping operation rotary bar and each compression crimping rods to transmit rotational force; And
And a pressing handle for rotating the pressing operation rotating bar,
The two pressing rollers are rotated in one direction by rotating the pressing handle in one direction so that the pressing wire is wound around the pressing roller to move the lower grating upward,
And the lower grating is moved downward by rotating the two pressing rollers in the other direction by rotating the pressing handle in the other direction to release the respective pressing wires wound on the pressing roller, Wastewater treatment device. The image forming apparatus according to claim 4,
A crush discharge port provided on a bottom surface of the second reaction space part below the lower grating; And
And a discharge guide for guiding the microorganisms desorbed from the filter medium and the sludge to be moved to the squeeze discharge port. The apparatus according to claim 1,
A sedimentation tank having a sedimentation space part therein;
A first sediment discharge unit for discharging the treated water in which the sludge has settled in the sedimentation space; And
And a second sediment discharge portion for discharging the sludge settled in the treated water supplied to the sedimentation space portion. 9. The method of claim 8,
And a sludge circulation unit for circulating the sludge discharged from the sedimentation unit to be supplied to the aeration unit. The method according to claim 1,
And a pretreatment means for pretreating the wastewater flowing into the aeration tank.

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