KR100844503B1 - Method and apparatus for treating wastewater - Google Patents

Abstract

An apparatus for treating wastewater is provided to secure water quality of a wastewater treatment reference value or less stably and easily by adding parts to facilities installed at an existing wastewater treatment plant, mix a flocculant with raw water promptly and stably, and stably perform flocculation of floc or sludge through multiple flocculating steps, and a method for treating wastewater using the apparatus is provided. A method for treating wastewater comprises: a first flocculant mixing step(S1) of mixing a flocculant with the raw water by a mixing part installed on a pipeline while raw water moves to a first settling pond; a first floc flocculating step(S2) of producing a floc by allowing multistage flocculation parts installed in the first settling pond to flocculate alien substances contained in the raw water while the raw water mixed with the flocculant flows into the first settling pond; a first floc settling step(S3) of naturally settling the produced floc on a bottom of the first settling pond; a bio-reaction step(S4) of flowing the raw water having the floc removed therefrom into a bioreactor to perform a biological reaction; a second flocculant mixing step(S5) of mixing a flocculant with the raw water by a mixing part installed on a pipeline while raw water passing through the bioreactor moves to a second settling pond; a second floc flocculating step(S6) of producing a floc by allowing multistage flocculation parts installed in the second settling pond to flocculate alien substances contained in the raw water while the raw water mixed with the flocculant flows into the second settling pond; a second floc settling step(S7) of naturally settling the produced floc on a bottom of the second settling pond; and a treated water discharge step(S8) of discharging treated water having the floc removed therefrom in the second settling pond to the outside.

Description

Sewage treatment method and apparatus {Method and apparatus for treating wastewater}

The present invention relates to a sewage treatment method and apparatus for treating sewage to form discharged water, and more particularly, in the case where the treated flow rate is drastically increased while smoothly removing fine sludge or floc included in the sewage or generated in the treatment process. In addition, the present invention relates to a sewage treatment method and apparatus for stable sewage treatment to be made and to easily obtain water quality below a sewage treatment standard.

In general, organic matter, nitrogen, and phosphorus contained in sewage cause eutrophication in rivers, coastal waters, reservoirs, and the like, and over-proliferate algae that feed these nutrients.

When large amounts of domestic sewage, livestock waste, and industrial wastewater flow into the rivers, nutrients increase excessively, and beyond the natural purification capacity, the eutrophication such as green algae and red tide rapidly progresses, and the waters of rivers and reservoirs It depletes oxygen levels and promotes pollution and decay of aquatic ecosystems. Therefore, in order to prevent eutrophication, nutrients in sewage should be removed before they enter the body of rivers or the sea.

Referring to the conventional sewage treatment process as shown in FIG. 11, first, sand and contaminants are removed from sewage through the sand and contaminant removal device A, and the raw water from which the sand and the contaminants have been removed is the primary sedimentation basin 100. Into the sludge to precipitate, the raw water passed through the primary sedimentation basin 100 is grown microorganisms in the bioreactor 200 is precipitated in the secondary sedimentation basin.

The raw water treated with the sludge grown in the bioreactor 200 is introduced into the secondary settler 300 again, and the sludge is precipitated and removed from the secondary settler 300 to discharge the treated water to the outside.

However, the above conventional technology has the following problems.

Conventional sewage treatment apparatus has a problem that by removing the sludge contained in the raw water in a sedimentation basin by the natural sedimentation method, fine sludge or flocs are included in the treated water discharged without being removed.

In addition, when the daily treatment flow rate of the sewage treatment device is rapidly increased due to external factors such as rainy season or heavy rain, the size of the sedimentation tank is constant compared to the increase in the flow rate into the sewage treatment plant, resulting in insufficient sludge settling time. There is a problem that the water quality is worse.

In addition, in recent years, the sewage treatment standards of sewage treatment plants have been strengthened to 10 ppm of biological oxygen demand (BOD) and 40 ppm of chemical oxygen demand (COD), so that it is very difficult to obtain water quality below the sewage treatment standard through the conventional sewage treatment apparatus. to be.

Accordingly, the present invention has been made to solve the conventional problems as described above,

It is an object of the present invention to smoothly remove fine sludge or flocs contained in the sewage or generated during the treatment process, so that the sewage treatment can be stably performed even when the treatment flow rate is rapidly increased and the water quality below the sewage treatment standard can be easily obtained. The present invention provides a sewage treatment method and apparatus.

In addition, another object of the present invention is to provide a sewage treatment apparatus to easily and easily obtain the water quality below the sewage treatment standard by simply adding a part to the facility without removing the equipment installed in the existing sewage treatment plant.

In addition, another object of the present invention is to provide a sewage treatment apparatus that allows the mixing of the flocculant into the raw water quickly and stably.

In addition, another object of the present invention is to provide a sewage treatment apparatus that makes flocculation or sludge agglomeration stable through multi-step flocculation.

In order to achieve the object of the present invention as described above, the sewage treatment method according to a preferred embodiment of the present invention is a flocculant by a mixing unit installed on the pipeline while the raw water from which the sand and contaminants are removed from the sewage to the primary sedimentation basin A primary coagulant mixing step of mixing; The primary flocculation step of the raw water mixed with the flocculant is continuously moved to flow into the primary sedimentation basin and the floc is generated by agglomeration of foreign matter contained in the raw water by the multistage flocculation unit installed in the primary sedimentation basin. ; A primary floc precipitation step of causing the generated floc to naturally settle in the primary sedimentation basin and settle at the bottom of the primary sedimentation basin; A bioreaction step of performing a biological reaction by introducing raw water from which the floc is precipitated and removed from the primary sedimentation basin into a bioreactor; A secondary coagulant mixing step of mixing the coagulant by a mixing unit installed on the pipeline while the raw water passing through the bioreactor moves to the secondary sedimentation basin; The secondary flocculation step of the raw water mixed with the flocculant is continuously moved to flow into the secondary sedimentation basin and the floc is generated by agglomeration of foreign matter contained in the raw water by the multistage flocculation unit installed in the secondary sedimentation basin. ; A secondary floccule precipitation step of precipitation of the generated floc in the secondary sedimentation basin to the bottom of the secondary sedimentation basin; A treated water discharge step of discharging the treated water removed by precipitation of the floc in the secondary settler; It is characterized by including.

In order to achieve the object of the present invention as described above, the sewage treatment apparatus according to another preferred embodiment of the present invention includes a primary circular sedimentation basin having a sludge collector for receiving the raw water from which sand and contaminants have been removed; A bioreactor for receiving biological water discharged from the primary circular sedimentation basin and causing a biological reaction; A secondary circular sedimentation basin having a sludge collector receiving sludge to receive raw water passing through the bioreactor; It includes, the sludge collector is rotatably installed around the outer side of the raw water supply pipe is rotated by the operation of the collection mechanism drive the center cage and the raw water discharged through the raw water supply pipe to the upper end, once at the bottom of the center cage A sewage treatment apparatus having the combined scraper, the sewage treatment apparatus comprising: a mixing unit for mixing a flocculant while the raw water is moved to the primary and secondary circular sedimentation basins; An agglomeration unit installed in the sludge collectors of the primary circular sedimentation basin and the secondary circular sedimentation basin, respectively, to generate a floc in raw water mixed with the flocculating agent introduced into the primary circular sedimentation basin and the secondary circular sedimentation basin through the sludge collector; It is characterized by including.

In addition, the admixture, the upper end wall is attached to the inner upper surface of the inlet provided in the primary circular sedimentation basin and the secondary circular sedimentation, the upper side of the lower side and the open side, the state is spaced apart from the one side A lower end wall is attached to the inner lower surface of the inlet and closed and the upper side is opened, and the upper and lower sides are vertically installed between the lower end of the upper blocking wall and the upper end of the lower blocking wall. A stirring cylinder, a stirring impeller provided inside the stirring cylinder and rotated by a motor, a chemical spray nozzle for injecting a chemical to an upper side corresponding to a lower end of the stirring impeller inside the stirring cylinder, and the lower barrier wall It is characterized in that it comprises a overflow wall, the lower end is attached to the inner lower surface of the inlet in a state spaced apart from one side and the upper side is opened.

In addition, the mixing unit, the chemical injection nozzle is installed in the raw water supply pipe is installed to be sprayed in a downward direction corresponding to the raw water rising through the raw water supply pipe, and the chemical injection nozzle to supply the chemical to the chemical injection nozzle It is characterized in that it comprises a vertical drug supply pipe, one end is connected and the other end is exposed to the outside of the circular sedimentation basin.

In addition, the agglomeration portion, the first agglomerate cylindrically mounted around the upper end of the center cage discharged from the raw water, an outer rectifying plate installed around the outer peripheral surface of the first agglomerated cylinder and the raw water passing through, and the first agglomeration A second agglomeration cylinder mounted around the outer circumferential surface of the cylinder, a plurality of agglomeration paddles provided inside the second agglomeration cylinder, a motor driving unit for rotating the respective agglomeration pads, and corresponding agglomeration paddles It characterized in that it comprises a bottom plate rectifying plate, which is installed on the bottom surface of the second condensation cylinder and the raw water passes.

In order to achieve the object of the present invention as described above, the sewage treatment apparatus according to another preferred embodiment of the present invention and the primary rectangular sedimentation basin having a sludge collector for receiving sludge to remove raw water and sand from the sewage; ; A bioreactor for receiving biological water discharged from the primary rectangular sedimentation basin and causing a biological reaction; A secondary rectangular sedimentation basin having a sludge collector for receiving sludge to receive raw water passing through the bioreactor; A sewage treatment apparatus comprising: a mixing unit installed at an inlet side of the primary rectangular sedimentation basin and the secondary rectangular sedimentation basin and mixing a flocculant while the raw water is moved through the inlet; An agglomeration unit installed inside the primary rectangular sedimentation basin and the secondary rectangular sedimentation basin, respectively, to generate a floc in raw water in which coagulant introduced into the primary rectangular sedimentation basin and the secondary rectangular sedimentation basin are mixed; It is characterized by including.

In addition, the admixture, the upper end is attached to the inner upper surface of the inlet and closed, the lower side is open and the lower side is attached to the lower end is attached to the inner lower surface of the inlet in a state spaced apart from the one side. And an upper and lower lower blocking wall, vertically installed between a lower end of the upper blocking wall and an upper end of the lower blocking wall, and a stirring tube vertically opened to allow raw water to flow, and provided inside the stirring tube. A stirring impeller rotated by a motor, a chemical injection nozzle spraying a chemical to an upper side corresponding to a lower end of the stirring impeller into the stirring cylinder, and an inner lower surface of the inlet in a state spaced apart from one side of the lower blocking wall; It is characterized in that it comprises a overflow wall, the lower end is attached to the closed and the upper side is open.

In addition, the agglomeration unit is installed on the inlet side of the primary rectangular sedimentation basin and the secondary rectangular sedimentation basin, and a flocculation tank for collecting the raw water flowing into one side, the outer side of the flocculation tank and the inside of the primary rectangular sedimentation basin and the secondary rectangular sedimentation basin A plurality of flocculating rectifying walls spaced apart from each other, rotating paddles installed inside the flocculating tank and partitioned by the flocculating rectifying wall to agglomerate foreign matter contained in the raw water, and each of the rotating plaques. It characterized in that it comprises a cohesive drive unit for driving the rotation.

The present invention is smoothly removed to fine sludge or floc included in the sewage or generated during the treatment process, stable sewage treatment is performed even if the treatment flow rate is rapidly increased, the water quality below the sewage treatment standards can be easily obtained Has an effect.

In addition, the present invention simply and easily add parts to the facility without removing the existing equipment installed in the sewage treatment plant to obtain a stable and easy water quality below the sewage treatment standards, accordingly enormous time and manpower according to the removal and reconstruction of the facility It has the effect that the consumption of is smoothly eliminated.

Moreover, this invention has the effect that mixing of flocculant with raw water is quick and stable.

In addition, the present invention has the effect that the flocculation or sludge agglomeration is stable through the multi-step flocculation.

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

1 is a step diagram showing a sewage treatment method according to the present invention.

As shown in this, the sewage treatment method is a primary flocculant mixing step (S1) of mixing the flocculant with the raw water in the first step, the primary flocculation flocculation step (S2) of agglomerated as the raw water moves to produce the first floc, The first floc precipitation step (S3) in which the generated floc precipitates, the bioreaction step (S4) in which sludge is grown by bioreaction by introducing the raw water from which the floc is removed into the bioreactor, and the raw water discharged from the bioreactor. Secondary flocculant mixing step (S5) of mixing the flocculant into the second, the secondary flocculation step (S6) is agglomerated by agglomeration as raw water moves to produce a second floc, and the secondary flocculation step (S7) from which the generated flocs are precipitated And a treated water discharge step S8 for discharging the treated water after the floc is removed.

The primary coagulant mixing step (S1) refers to a step in which coagulant is mixed by a mixing unit installed on a pipeline while raw water from which sand and contaminants are removed from sewage is moved to a primary sedimentation basin.

In other words, this step is to forcibly mix the flocculant in the raw water that is moved to the primary sedimentation with sand and contaminants removed, so that the floc can be generated smoothly in the raw water introduced into the primary sedimentation.

In the primary flocculation step (S2), the raw water in which the flocculant is mixed is continuously moved to flow into the primary sedimentation basin, and the fine flocks included in the raw water are multistage by the multistage flocculation unit installed in the primary sedimentation basin. Refers to the stage of growth by aggregation.

That is, this step aggregates the raw water mixed with the flocculant through the multi-flocculation unit so that the flocs can be stably and smoothly generated, so that the fine flocks contained in the raw water can grow into large flocs and settle smoothly in the primary sedimentation basin. To ensure that

The primary floc precipitation step (S3) refers to a step in which the generated floc is grown while agglomerating to naturally settle in the primary sedimentation basin and thus settle at the bottom of the primary sedimentation basin.

That is, this step is to collect and remove the sludge collected in the primary sedimentation basin when the floc included in the raw water is collected on the bottom of the primary sedimentation basin, the primary floc is removed from the raw water.

The bioreaction step (S4) refers to a step of performing a biological reaction by introducing the raw water removed by precipitation of the floc in the primary sedimentation basin into the bioreactor.

In other words, this step is to allow the biological reaction to grow the organic matter contained in the raw water to change to a fine floc.

The secondary coagulant mixing step (S5) refers to a step in which the coagulant is mixed by the mixing unit installed on the pipeline while the raw water passing through the bioreactor moves to the secondary sedimentation basin.

That is, this step is to forcibly mix the flocculant in the raw water that is moved to the secondary settler with the fine floc generated in the bioreactor, so that the fine floccules in the raw water introduced into the secondary settler can be grown into large flocs will be.

In the secondary flocculation step (S6), the raw water mixed with the flocculant is continuously moved to flow into the secondary sedimentation basin, and the fine floccules are agglomerated by the multistage flocculation part installed in the secondary sedimentation basin. As the stage of growth.

That is, this step aggregates the raw water mixed with the flocculant through the multi-flocculation unit so that the flocs can be stably and smoothly generated. Thus, fine flocs contained in the raw water can be grown into large flocs and precipitated smoothly in the secondary settler. To ensure that

The secondary floc sedimentation step (S7) refers to a step in which the generated floc is grown while agglomerating to naturally settle in the secondary sedimentation basin, and thus settle at the bottom of the secondary sedimentation basin.

That is, this step is to collect and remove through the sludge collector installed in the secondary sedimentation when the floc contained in the raw water is grown and settled on the bottom of the secondary sedimentation basin, so that the fine floes are removed secondarily from the raw water.

The treated water discharge step (S8) refers to a step of discharging the treated water removed by precipitation of the floc in the secondary sedimentation basin to the outside.

In this way, the sewage treatment method repeats the mixing and flocculation of flocculant twice during the treatment of sewage, so that organic and inorganic substances contained in the sewage can be stably and smoothly removed. You can easily obtain.

2 is a schematic configuration diagram showing a first embodiment according to the present invention.

As shown therein, the sewage treatment apparatus includes a primary circular settler 10 into which raw water is introduced to precipitate foreign matters, a bioreactor 20 connected to the primary circular settler 10, and the bioreactor 20 ) And the secondary circular settling basin 30, the sludge collector 40 installed in the primary circular settling basin 10 and the secondary circular settling basin 30, and the primary circular settling basin 10 and secondary It includes a mixing unit 50 is installed on the inlet (P) side of the circular sedimentation basin 30, and the aggregation unit 60 is installed in the sludge collector 40.

The primary circular sedimentation basin 10 receives raw water from which sand and contaminants have been removed from sewage and removes the sludge settled through natural sedimentation with a sludge collector 40 installed therein.

The bioreactor 20 receives raw water discharged in a state in which sludge is removed from the primary circular sedimentation basin 10, thereby causing a biological reaction to grow organic matter contained in the raw water into a fine floc.

The secondary circular sedimentation basin 30 receives raw water passing through the bioreactor 20 and removes the floc deposited through natural sedimentation with the sludge collector 40 installed therein.

The sludge collector 40 is installed inside the primary circular sedimentation basin 10 and the secondary circular sedimentation basin 30, respectively, and the flocks generated from the raw water are naturally precipitated by the primary circular sedimentation basin 10 and 2. Sludge formed while being precipitated on the inner bottom surface of the primary circular sedimentation basin 30 serves to discharge to the outside.

The mixing unit 50 is to mix the flocculant while the raw water is moved to the primary circular sedimentation basin 10 and the secondary circular sedimentation basin 30 through the inlet (P), the raw water mixed with the flocculant is the primary circular In the settler 10 and the secondary circular settler 30 is to be smoothly aggregated so that the flocs can be grown.

The agglomeration part 60 is installed in the sludge collector 40 of the primary circular sedimentation basin 10 and the secondary circular sedimentation basin 30, respectively, and the primary circular sedimentation basin 10 through the sludge collector 40. And agglomerates fine flocs from raw water mixed with a flocculant introduced into the secondary circular sedimentation basin 30 to grow into large flocs.

FIG. 3 is a front sectional view showing a miscible part according to the first embodiment of the present invention, and FIG. 4 is a schematic plan sectional view of the first embodiment according to FIG.

As shown in the drawing, the admixture 50 has an upper end wall attached to the inner upper surface of the inlet P provided in the circular sedimentation basin, the upper end wall 51 being closed and the lower side opened, and the upper blocking wall ( The lower blocking wall 52 is attached to the inner lower surface of the inlet P in a state spaced apart from one side and closed and the upper side is opened, and the lower and lower blocking of the upper blocking wall 51. A stirring cylinder 53 installed vertically between the upper ends of the walls 52 and opened up and down so that raw water flows, and a stirring impeller 54 provided inside the stirring cylinder 53 and rotated by a motor; In the state of being spaced apart to one side with the chemical injection nozzle 55 and the lower blocking wall 52 to inject the chemical to the upper side corresponding to the lower end of the stirring impeller 54 into the inner side of the stirring cylinder 53 Lower wall attached to the inner lower surface of the inlet (P) and closed, the overflow wall with the upper side open And 56.

The upper blocking wall 51 and the lower blocking wall 52 guide the raw water flowing through the inlet (P) to an open part so that the stirring can flow from the lower side to the upper side through the stirring tube 53 and at the same time the stirring It serves to support the barrel (53).

The stirring cylinder 53 is installed vertically with the upper and lower sides open so that raw water flows from the lower side to the upper side. The stirring impeller 54 is rotated in the stirring cylinder 53 while being driven by a motor and serves to mix the coagulant injected through the chemical injection nozzle 55 with the raw water in the stirring cylinder 53. .

The chemical injection nozzle 55 is installed in the upper direction corresponding to the lower surface of the stirring impeller 54, and the coagulant, which is a chemical supplied through the pipe from the outside of the inlet port P, is directed toward the stirring impeller 54. It serves to spray to the side.

The wall wall 56 is installed relatively higher than the stirring cylinder 53 to have a constant water level in the inlet (P) inside, the raw water in the stirring cylinder 53 stably with the flocculant stir It serves to prevent the sudden discharge of raw water from the stirring barrel 53 to be.

The mixing unit 50 configured as described above is provided on the inlet (P) side of the circular sedimentation basin, so that it can be easily installed by adding a part to the existing circular sedimentation basin.

5 is an enlarged front sectional view showing main parts of the first embodiment according to the present invention.

As shown in this, the sludge collector 40 installed inside the circular sedimentation basin is rotatably installed on the outer circumference of the raw water supply pipe 41 is rotated by the operation of the collection mechanism driving unit 42 and the raw water supply pipe ( A center cage 43 through which raw water supplied through 41 is discharged, and a scraper 44 having one end coupled to the lower end of the center cage 43.

The sludge collector 40 is installed in the inner center of the circular sedimentation basin, the raw water is introduced through the raw water supply pipe 41 connected to the inlet (P) is discharged into the interior of the circular sedimentation basin through the top of the center cage 43 Then, as the foreign matter settles naturally in the discharged raw water, sludge is deposited on the bottom surface of the circular sedimentation basin.

The sludge precipitated in this way is rotated together with the center cage 43 by the scraper 44 installed in the center cage 43 which is rotated by the collecting mechanism moving part 42, and thus, the inside of the circular sedimentation basin is scratched. Collected to the center is discharged to the outside through the sludge discharge port (H) to remove.

The center cage 43 is agglomerated portion 60 is installed around the upper end, the raw water is agglomerated while the raw water is discharged to the inside of the circular sedimentation basin through the center cage 43.

The agglomeration part 60 which serves as described above has a first agglomeration cylinder 61 mounted in a cylindrical shape around the top of the center cage 43, and is installed around the outer circumferential surface of the first agglomeration cylinder 61. The outer rectifying plate 62 to pass through, the second agglomeration cylinder 63 mounted in a cylindrical shape around the outer circumferential surface of the first agglomeration cylinder 61, and a plurality of inside the second agglomeration cylinder 63 Agglomeration paddle 64, a motor drive unit 65 for driving each of the agglomeration paddles 64, and installed on the lower surface of the second agglomeration cylinder 63 corresponding to the agglomeration paddle 64 And a lower surface rectifying plate 66 through which raw water passes.

The first aggregator 61 serves to collect raw water flowing into the center cage 43 from the upper end of the raw water supply pipe 41 and discharged to the outside through the upper circumference of the center cage 43. The outer rectifying plate 62 serves to grow the fine flocks contained in the raw water while uniformly flowing the raw water collected by the first condensation cylinder 61 to the outside.

The second agglomeration cylinder 63 serves to collect the raw water passing through the outer rectifying plate 62, the flocculation paddle 64 is rotated to grow the raw water to grow the fine flocks contained in the raw water , The grown floc increases the specific gravity, and naturally precipitates through the rectifying plate 66, thereby increasing the precipitation effect.

The agglomeration paddle 64, which plays such a role, is not limited to the vertical paddle as shown, but various techniques may be applied to agitate the fine flocks contained in the raw water inside the second agglomerate such as an impeller. Let's find out.

The motor driving unit 65 serves to rotationally drive the aggregation paddle 64 inside the second aggregation cylinder 63. The bottom rectifying plate 66 flows while uniformly discharging the flocks generated by the second condensation cylinder 63 to the lower side to achieve coagulation of raw water.

The agglomeration part 60 is configured as described above is agglomeration of the raw water in a multi-step inside the first agglomeration cylinder 61 and the second agglomeration cylinder 63, the fine floc contained in the raw water smoothly aggregates the large It is grown smoothly into the flocs, and the large flocks thus grown are settled on the bottom surface of the circular sedimentation basin while being settled by their own weight, so that the sludges are collected by the scraper 44 of the sludge collector 40 and the sludge discharge port. It is discharged to outside through (H).

In addition, the agglomeration part 60 is provided to be easily installed by adding accessories to the sludge collector 40 that is previously installed in the circular sedimentation basin.

Figure 6 is a schematic configuration diagram showing a second embodiment according to the present invention, Figure 7 is an enlarged front sectional view of the main portion of the second embodiment according to the present invention.

As shown therein, the sewage treatment apparatus includes a primary circular settler 10 into which raw water is introduced to precipitate foreign matters, a bioreactor 20 connected to the primary circular settler 10, and the bioreactor 20 ) And the secondary circular settling basin 30, the sludge collector 40 installed in the primary circular settling basin 10 and the secondary circular settling basin 30, and the primary circular settling basin 10 and secondary The mixing unit 50 is installed in the sludge collector 40 of the circular sedimentation basin 30, and the agglomeration unit 60 is installed in the sludge collector 40 to the outside of the mixing unit 50.

The sludge collector 40 is rotatably installed on the outer circumference of the raw water supply pipe 41 is rotated by the operation of the collection mechanism 42 and the center cage discharged from the raw water supplied through the raw water supply pipe 41 to the top 43 and a scraper 44 having one end coupled to the lower end of the center cage 43.

The mixing unit 50 is installed in the raw water supply pipe 41 and the chemical injection nozzle 57 is installed to be sprayed in the lower direction corresponding to the raw water rising through the raw water supply pipe 41, and the chemical injection nozzle One end is connected to the (57), and the other end includes a vertical drug supply pipe 58 exposed to the outside of the circular settler.

The chemical injection nozzle 57 sprays a coagulant which is a chemical downward in response to the raw water that is raised through the raw water supply pipe 41, and thus the raw water passes through the raw water supply pipe 41 and through the top of the center cage 43. It is to be mixed with the flocculant during discharge to the outside. The chemical supply pipe serves to supply a chemical coagulant to the chemical injection nozzle 57 from the outside of the raw water supply pipe 41.

The agglomeration part 60 collects the raw water through the first agglomeration cylinder 61 that is cylindrically mounted around the upper end of the center cage 43, and then the raw water is first agglomerated while passing through the outer rectifying plate 62. The coagulation paddle 64 and the lower surface rectifying plate 66 in which the raw water collected in the second agglomeration cylinder 63, which is cylindrically mounted around the outer circumferential surface of the first agglomeration cylinder 61, are rotated by the motor driving unit 65. It is to be agglomerated secondary by).

When the fine floccules are agglomerated and grown into a large floc, the fine floccules settle to the bottom of the circular sedimentation basin while naturally sedimented by its own weight, and the sludge is collected by the sludge collector 40 and collected through the sludge outlet H. It is discharged to the outside.

8 is a schematic configuration diagram showing a third embodiment according to the present invention.

As shown therein, the sewage treatment apparatus includes a primary rectangular sedimentation basin 10a through which raw water is introduced and flocs are settled, a bioreaction tank 20a connected with the primary rectangular sedimentation basin 10a, and the bioreactor ( Secondary rectangular sedimentation basin 30a connected to 20a), sludge collector 40a installed in the primary rectangular sedimentation basin 10a and secondary rectangular sedimentation basin 30a, and the primary rectangular sedimentation basin 10a and 2 A mixing unit 50a provided at the inlet P side of the primary rectangular sedimentation basin 30a, and an agglomeration unit 60a provided in the primary rectangular sedimentation basin 10a and the secondary rectangular sedimentation basin 30a, respectively. Include.

The primary rectangular sedimentation basin (10a) is to have a sludge collector 40 for receiving the sludge to remove the raw water and sand from the sewage. The bioreactor 20a receives the raw water discharged from the first rectangular sedimentation basin 10a to cause a biological reaction.

The secondary rectangular sedimentation basin 30a has a sludge collector 40a that receives raw water that has passed through the bioreactor 20a and removes sludge.

The sludge collector 40a is a chain flight type device installed inside the primary rectangular sedimentation basin 10a and the secondary rectangular sedimentation basin 30a, and the chain is moved in an endless track to scrape the sludge settled on the floor with a fly. It serves to remove it.

The admixture 50a is installed at the inlet P side provided in the primary rectangular sedimentation basin 10a and the secondary rectangular sedimentation basin 30a, and mixes the flocculant while the raw water is moved through the inlet P. It plays a role.

The agglomeration part 60a is installed inside the primary rectangular sedimentation basin 10a and the secondary rectangular sedimentation basin 30a, respectively, and flows into the primary rectangular sedimentation basin 10a and the secondary rectangular sedimentation basin 30a. The flocculant serves to agglomerate fine flocs from the mixed raw water and grow it into a large floc.

9 is a front sectional view showing a mixing unit according to a third embodiment of the present invention.

As shown in the figure, the admixture 50a has an upper end attached to the inner upper surface of the inlet P and is closed, and the lower side is open to the upper blocking wall 51a and the upper blocking wall 51a to one side. The lower blocking wall 52a having the lower end attached to the inner lower surface of the inlet P and being closed and the upper side opened in the spaced apart state, and the lower end of the upper blocking wall 51a and the lower blocking wall 52a A stirring cylinder 53a installed vertically between the upper ends and opened up and down so that raw water flows, a stirring impeller 54a provided inside the stirring cylinder 53a and rotated by a motor, and the stirring cylinder ( The chemical injection nozzle 55a which injects the chemical to the upper side corresponding to the lower end of the stirring impeller 54a to the inside of the 53a), and the lower inlet wall 52a and the one side of the inlet port P. A lower wall is attached to the inner lower surface and closed, and the upper wall includes an open wall 56a. .

The upper blocking wall 51a and the lower blocking wall 52a guide the raw water flowing through the inlet port P to an open part so that the upper blocking wall 51a and the lower blocking wall 52a can flow from the lower side to the upper side through the stirring tube 53a. It serves to support the barrel 53a.

The stirring cylinder 53a is installed vertically with the upper and lower sides open so that raw water flows from the lower side to the upper side. The stirring impeller (54a) is driven by a motor to rotate the inside of the stirring barrel (53a) serves to mix the coagulant injected through the chemical injection nozzle (55a) with the raw water in the stirring cylinder (53a). .

The chemical injection nozzle (55a) is installed in the upper direction corresponding to the lower surface of the stirring impeller (54a), the coagulant which is a chemical supplied through the pipe from the outside of the inlet (P) toward the stirring impeller (54a) It serves to spray to the side.

The wall wall 56a is installed relatively higher than the stirring cylinder 53a so that the raw water has a constant water level inside the inlet P, and the raw water is stably mixed with the flocculant in the stirring cylinder 53a. It serves to prevent the sudden discharge of raw water from the stirring barrel (53a) to be.

The mixing unit 50a configured as described above is provided at the inlet P side of the rectangular sedimentation basin, so that the mixing unit 50a can be easily installed by adding a part to the existing rectangular sedimentation basin.

10 is an enlarged front sectional view showing main parts of a third embodiment according to the present invention.

As shown therein, the agglomeration part 60a is installed at the inlet side of the rectangular sedimentation basin and collects the raw water flowing into one side, and the inside of the rectangular sedimentation basin and the outside of the agglomeration tank 61a. A plurality of flocculating rectifying walls 62a which are installed to be spaced apart from each other, inside the flocculating tank 61a and inside partitioned by the flocculating rectifying wall 62a are rotated, and the fine flocks contained in the raw water are large. Rotating paddle (63a) for agglomeration to the floc, and agglomeration drive unit (64a) for driving the rotation paddle (63a) of each rotation.

The coagulation tank (61a) serves to capture the raw water flowing into the rectangular sedimentation basin through the inlet (P).

The agglomeration rectifying wall 62a is spaced apart from the agglomeration tank 61a and inside the rectangular sedimentation basin by a plurality of compartments, and flows from the inside of the rectangular sedimentation basin to the rear side through the agglomeration tank 61a. By simultaneously aggregating the raw water uniformly and simultaneously, the fine flocks grow into the large flocks in the uniformly flowing raw water so as to smoothly settle in the rectangular sedimentation basin.

The rotary paddle 63a is installed inside the agglomeration tank 61a by the agglomeration driving unit 64a and inside the rectangular sedimentation basin partitioned by the agglomeration rectifying wall 62a, respectively, while stirring the raw water. By stirring the same raw water, the fine flocks contained in the raw water are more smoothly grown into large flocs.

The agglomeration part 60a configured as described above aggregates the raw water in multiple stages by the coagulation rectifying wall 62a and the plurality of rotating paddles 63a, so that the fine flocks contained in the raw water are smoothly aggregated into a large floc. The stably grown large-sized flocs are discharged horizontally from the rectangular sedimentation basin to naturally settle to the bottom surface of the rectangular sedimentation basin.

1 is a step diagram showing a sewage treatment method according to the present invention,

2 is a schematic configuration diagram showing a first embodiment according to the present invention;

3 is a front sectional view showing a mixing unit according to the first embodiment of the present invention;

4 is a schematic plan sectional view of the first embodiment according to FIG. 3;

5 is an enlarged front sectional view showing main parts of the first embodiment according to the present invention;

6 is a schematic diagram showing a second embodiment according to the present invention;

7 is an enlarged front sectional view of main parts of a second embodiment according to the present invention;

8 is a schematic structural diagram showing a third embodiment according to the present invention;

9 is a front sectional view showing a mixing unit according to a third embodiment of the present invention;

10 is an enlarged front sectional view showing main parts of a third embodiment according to the present invention;

11 is a schematic configuration diagram showing a conventional sewage treatment apparatus.

* Explanation of symbols for the main parts of the drawings

10: first round settler 20: bioreactor

30: secondary circular sedimentation basin

40: Sludge Collector

   41: raw water supply pipe 42: eastern collection mechanism

   43: center cage 44: scraper

50: mixing unit

   51: upper blocking wall 52: lower blocking wall

   53: stirring cylinder 54: stirring impeller

   55: chemical injection nozzle 56: overflow wall

60: aggregate

   61: first condenser 62: outer rectifying plate

   63: second coagulation bin 64: cohesive paddle

   65: motor drive part 66: bottom rectifying plate

Claims (8)

A primary coagulant mixing step (S1) in which coagulant is mixed by a mixing unit installed on a pipeline while sand and contaminants removed from sewage are moved to a primary sedimentation basin; The primary flocculation step of mixing the raw water mixed with the flocculant is introduced into the primary sedimentation basin and the floc is generated by agglomeration of foreign substances contained in the raw water by the multistage agglomeration unit installed in the primary sedimentation basin. S2); A primary floc precipitation step (S3) in which the generated floc is naturally precipitated in the primary sedimentation basin and settled at the bottom of the primary sedimentation basin; A bioreaction step (S4) in which raw water removed by precipitation of the floc in the primary sedimentation basin is introduced into a bioreactor to perform a biological reaction; A secondary coagulant mixing step (S5) in which coagulant is mixed by a mixing unit installed on the pipeline while the raw water passing through the bioreactor moves to the secondary sedimentation basin; Secondary flocculation step in which the raw water mixed with the flocculant is continuously moved and flows into the secondary sedimentation basin, whereby foreign matter contained in the raw water is agglomerated by the multistage agglomeration unit installed in the secondary sedimentation basin. S6); A secondary floc precipitation step (S7) in which the generated floc is naturally precipitated in the secondary sedimentation basin and precipitated at the bottom of the secondary sedimentation basin; Treated water discharge step (S8) for discharging the treated water removed by sedimentation of the floc in the secondary sedimentation basin; Sewage treatment method comprising a. A primary circular sedimentation basin 10 having a sludge collector 40 for receiving sludge from the sewage and receiving raw water from which sand and contaminants have been removed; A bioreactor 20 for receiving a raw water discharged from the primary circular settler 10 and causing a biological reaction; A secondary circular sedimentation basin (30) having a sludge collector (40) for receiving sludge to receive raw water passing through the bioreactor (20); It includes, the sludge collector 40 is rotatably installed around the outer side of the raw water supply pipe 41 is rotated by the operation of the collection mechanism drive 42 and discharged raw water supplied through the raw water supply pipe 41 to the top In the sewage treatment apparatus having a center cage 43 and a scraper 44 having one end coupled to a lower end of the center cage 43, A mixing unit 50 for mixing the coagulant while the raw water is moved to the primary circular sedimentation basin 10 and the secondary circular sedimentation basin 30; Installed in the sludge collector 40 of the primary circular sedimentation basin 10 and the secondary circular sedimentation basin 30, respectively, through the sludge collector 40, the primary circular sedimentation basin 10 and the secondary circular sedimentation basin 30. An agglomeration part 60 for agglomeration of foreign substances in raw water mixed with a coagulant flowing into the coagulation to generate a floc; Sewage treatment apparatus comprising a. The method of claim 2, wherein the mixing unit 50, An upper blocking wall 51 having an upper end attached to an inner upper surface of an inlet provided in the primary circular sedimentation basin 10 and the secondary circular sedimentation basin 30 and having a lower side open; A lower barrier wall 52 having a lower end attached to an inner lower surface of the inlet port and being closed with the upper barrier wall 51 spaced to one side, and having an upper side open; A stirring cylinder 53 vertically installed between the lower end of the upper blocking wall 51 and the upper end of the lower blocking wall 52 and opened up and down so that raw water flows; A stirring impeller 54 provided inside the stirring cylinder 53 and rotated by a motor; A chemical injection nozzle 55 for injecting a chemical to an upper side corresponding to a lower end of the stirring impeller 54 into an inside of the stirring cylinder 53; In the state spaced apart from the lower blocking wall 52 to one side, the lower wall is attached to the inner bottom of the inlet is closed and the upper side wall 56 is opened, Sewage treatment apparatus comprising a. The method of claim 2, wherein the mixing unit 50, A chemical injection nozzle 57 installed inside the raw water supply pipe 41 and installed to be sprayed downward in response to raw water rising through the raw water supply pipe 41; A vertical chemical supply pipe 58, one end of which is connected to the chemical injection nozzle 57 and the other end of which is exposed to the outside of the circular sedimentation basin to supply the chemical to the chemical injection nozzle 57, Sewage treatment apparatus comprising a. The method of claim 2, wherein the aggregation portion 60, A first agglomeration cylinder 61 mounted cylindrically around an upper end of the center cage 43 where raw water is discharged; An outer rectifying plate 62 installed around an outer circumferential surface of the first condensing cylinder 61 and passing raw water therethrough; A second agglomeration cylinder 63 mounted cylindrically around an outer circumferential surface of the first agglomeration cylinder 61; A plurality of agglomeration paddles 64 provided in the second agglomeration cylinder 63; A motor driving unit 65 for driving each of the agglomeration paddles 64; The lower surface rectifying plate 66 is installed on the lower surface of the second agglomeration cylinder 63 in correspondence with the agglomeration paddle 64 and the raw water passes therethrough. Sewage treatment apparatus comprising a. A primary rectangular sedimentation basin 10a having a sludge collector 40a for receiving sludge and removing sludge from raw water having been removed from sewage; A bioreactor 20a for receiving a raw water discharged from the primary rectangular sedimentation basin 10a and causing a biological reaction; A secondary rectangular sedimentation basin 30a having a sludge collector 40a for receiving sludge to receive raw water passing through the bioreactor 20a; In the sewage treatment apparatus containing, A mixing unit 50a installed at an inlet side of the first rectangular sedimentation basin 10a and the second rectangular sedimentation basin 30a to mix the coagulant while the raw water is moved through the inlet; Foreign matter from raw water in which coagulant is introduced into the primary rectangular sedimentation basin 10a and the secondary rectangular sedimentation basin 30a, respectively, and is introduced into the primary rectangular sedimentation basin 10a and the secondary rectangular sedimentation basin 30a. An agglomeration part 60a for agglomeration to generate a floc; Sewage treatment apparatus comprising a. According to claim 6, wherein the mixing unit (50a), An upper blocking wall 51a having an upper end attached to the inner upper surface of the inlet and being closed and having a lower side opened; A lower barrier wall 52a having a lower end attached to an inner lower surface of the inlet and closed and an upper side opened in a state spaced apart from the upper barrier wall 51a on one side; A stirring cylinder 53a installed vertically between a lower end of the upper blocking wall 51a and an upper end of the lower blocking wall 52a and having an upper and lower sides opened so that raw water flows; A stirring impeller 54a provided inside the stirring cylinder 53a and rotated by a motor; A chemical injection nozzle 55a for injecting a chemical to an upper side corresponding to a lower end of the stirring impeller 54a into the stirring cylinder 53a; A lower wall is attached to the inner lower surface of the inlet port in a state spaced apart from the lower blocking wall 52a and closed, and the overflow wall 56a having the upper side opened. Sewage treatment apparatus comprising a. The method of claim 6 wherein the aggregation portion (60a), An agglomeration tank 61a installed at an inlet side of the primary rectangular sedimentation basin 10a and the secondary rectangular sedimentation basin 30a and collecting raw water introduced into one side; A plurality of agglomerated rectifying walls 62a installed to be spaced apart from each other in the outer side of the agglomeration tank 61a and in the first rectangular sedimentation basin 10a and the secondary rectangular sedimentation basin 30a; Rotating paddle (63a) is installed in the interior of the coagulation tank (61a) and partitioned by the coagulation rectification wall (62a) and agglomerates foreign matter contained in the raw water and rotated, Agglomeration drive unit (64a) for driving the rotation paddle (63a) of each rotation, Sewage treatment apparatus comprising a.

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