JP2000350983A - Cleaning apparatus of sludge-containing sewage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly operate the subject apparatus for cleaning sewage by removing sludge in sewage to obtain treated water adjusted to a waste standard value or less without clogging a filter device arranged on the downstream side of the apparatus within a short period of time. SOLUTION: A tank body is constituted of a sludge flotation tank 2 to which sewage and air bubbles are supplied and a sedimentation tank 13 communicating with the sludge flotation tank 2 on the downstream side of the flotation tank 2. A floating substance discharge opening and a sludge discharge opening are provided to the sludge flotation tank 2 on the downstream side thereof and a sludge scraping-off device 22 is arranged on the side of both the discharge openings. A sludge/oil component discharge pipe 20 is provided on the downstream side of the sedimentation tank 13 of sludge, and flow paralleling plates 17, 18 and a water level adjusting tank 21 are provided on the downstream side thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing so-called chemical rags and chemical mops, impregnated with a mineral oil-based detergent, sewage washed from chemical mops, and other sludge in rinsing water to purify the sewage to within a wastewater standard value. The present invention relates to a sludge-containing sewage purification apparatus that can be operated smoothly without clogging of a downstream filtration apparatus.

[0002]

2. Description of the Related Art FIGS. 13 and 14 show a conventional sewage purification apparatus. In the figure, reference numeral 81 denotes a sewage treatment tank having a substantially rectangular planar shape. The sewage treatment tank 81 is provided with a sewage inlet 82 at a lower portion on the upstream side, and is located near the sewage inlet 82 to guide sewage upward. The guide plate 83 is set up in an inclined state. A sewage discharge port 84 is provided at an upper portion on the upstream side of the sewage treatment tank 81, and a discharge plate 85 for guiding sewage is provided at the sewage discharge port 84. Reference numeral 86 denotes a sludge scraping device disposed above the sewage treatment tank 81. The sludge scraping device 86 includes a drive roller 86A pivotally supported by the sewage treatment tank 81.
A rotating belt 86 having a plurality of scraping blades 86C, 86C,...
D, and drive motor 86 via drive roller 86A.
E rotates the support belt 86D in the direction indicated by the arrow. 87 is a rectifying plate provided on the downstream side of the sewage treatment tank 81, 88 is a water level adjusting tank provided on the downstream side of the rectifying plate 87,
An adjusting pipe 89A made of an elbow pipe is provided in the water level adjusting tank 88.
Is provided with a water level adjusting means 89 in which an adjusting valve 89B is inserted so as to be able to move up and down manually. The treated water is discharged to the overflow tank 90 side through the water level adjusting means 89.

[0003] The conventional sewage treatment apparatus has the above-described configuration, and the sewage flowing into the sewage treatment tank 81 from the sewage inlet 82 rises along the guide plate 83 and flows downstream. The suspended matter including the sludge floating on the water surface side while flowing is raked toward the sewage discharge port 84 side by the sludge scraping device 86, and discharged to the outside from the sewage discharge port 84 via the discharge plate 85. The treated water flowing to the downstream side flows into the water level adjusting tank 88 over the straightening plate 87 and is discharged to the filtration device side through the water level adjusting means 89.

FIG. 15 shows another prior art, in which 91 is a depressed frustoconical bottom portion 91A and a circular trunk portion 91A.
B, a tank body provided with a sludge discharge port 91C at the center of the bottom 91A, and 92 is a sewage guide tube formed of a cylinder projecting from the bottom 91A and having an upper end expanded outward. A sewage supply pipe 93 is inserted. 94 is a plurality of water collecting holes 94A, 94A,.
The water collecting pipe 94 is disposed along the inner peripheral surface of the tank main body 91 and communicates with a water level adjusting device 96 via a communication pipe 95. Reference numeral 97 denotes a sludge scraping device installed on the upper portion of the tank body 91. The sludge scraping device 97 is a rotary arm 97C, 9 supported by an arm support 97B that is driven to rotate by a drive motor 97A.
It has a configuration in which a wing 97D is attached to 7C. Reference numeral 98 denotes a sludge discharge plate which is provided below the rotating scraper wing 97D and is provided in the tank main body 91 at an angle. A sludge discharge plate 98 is connected to a sludge discharge pipe 99.

[0005] The above-mentioned prior art has a sewage supply pipe 9.
The sludge in the sewage that has flowed into the tank body 91 from 3 through the sewage guide cylinder 92 sinks below the sewage guide cylinder 92, and the sludge containing the suspended matter that has risen is swept by the scraping blades 97 </ b> D of the sludge scraper 97. It is swept onto the sludge discharge plate 98 and discharged to the outside from the sludge discharge pipe 99. On the other hand, the purified treated water is collected by a water collecting pipe 94 and sent out from a water level adjusting tank 96 to the filtration device side.

[0006]

In the first prior art having the above construction, the sewage supplied from below one side in the sewage treatment tank 81 is raised along the guide plate 83, and the sludge which has floated Although the sludge is scraped out by the sludge scraping device 86, the floating sludge flows downstream with the treated water, stays in the water level adjusting tank 21, and has a drawback of flowing out to the filtration device side. Further, the second conventional technique has a drawback that sludge that is rising or settling flows into the water collecting pipe 94 because the rising sludge and the treated water are not separated. For this reason, any conventional technology can purify sewage within a wastewater standard value, but there is a drawback that a filtration device installed on the downstream side is clogged in a short time because sludge is not sufficiently removed. There is a problem that the wastewater is drained without using a filtration device, and there is a disadvantage that the treatment efficiency of the entire sewage purification system is poor and a burden of maintenance work is large.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and is intended to remove sludge sufficiently to purify sewage water to a wastewater standard value or less and to operate a filtration device smoothly without clogging. It is an object of the present invention to provide an apparatus for purifying sludge containing sewage.

[0008]

According to a first aspect of the present invention, there is provided a sludge floating tank to which sewage and air bubbles are supplied from an upstream lower portion, A sewage rise guide plate located downstream from the supply position and erected on the upstream side of the sludge floating tank, a sludge discharge port and a suspended matter discharge port provided on the downstream side of the sludge floating tank, and the sludge floating A sludge scraping means disposed at the upper part of the tank and for scraping sludge and the like in a downstream direction, a sludge sedimentation tank into which wastewater flows in from a downstream side of the sludge floating tank through a communication port, and a downstream side of the sludge sedimentation tank. It comprises a water level adjusting tank which is arranged in communication, a treated water discharge pipe which is provided in the water level adjusting tank and sends out treated water to the filtration device side, and a sludge removing port provided in the sludge settling tank.

[0009] An oil or other discharge pipe may be provided downstream of the sludge settling tank.

[0010] It is preferable that a straightening vane is provided upright on the downstream side of the sludge sedimentation tank.

Further, according to a second aspect of the present invention, there is provided a tank main body having a conical concave bottom portion having a sludge discharge port at the center of the bottom portion, and being concentrically inserted into the tank main body. Outer sludge separation tank and inner plurality of sludge sedimentation tanks defined by a plurality of cylindrical partition bodies, and a sewage recirculation prevention plate provided between the tank body and the cylindrical partition body, An upstream communication port formed on the one cylindrical partition wall and located on the upstream side of the sewage recirculation prevention plate to allow the sewage of the sludge separation tank to flow into the sludge sedimentation tank side, and an upstream of the sewage recirculation prevention plate. And a downstream communication port formed on the other cylindrical partition body at the side thereof to allow the sewage of the one inner sludge sedimentation tank to flow into the other inner sludge sedimentation tank, and the sludge separation tank and the inner sludge sedimentation tank A sludge discharge unit provided on the upper side of the sludge for discharging the floating sludge to the outside, Rotatably provided on the upper portion of the body,
A sludge scraping means for scraping the rising sludge or the like to the sludge discharge portion side; a sewage supply port provided in the tank body for supplying sewage into a sludge separation tank; and a bubble discharge port for discharging bubbles, It is disposed at the center of the main body, and comprises a treated water discharge pipe for sending treated water to the filtration device side, and a water level adjusting tank provided in communication with the treated water discharge pipe.

In the tank body, a treated water inflow tank having a longitudinally formed treated water inflow groove is provided so as to surround the treated water discharge pipe, and the treated water inflow tank and the other cylindrical partition wall are provided. It is preferable to provide a sewage recirculation prevention plate between the body.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings, arrow A indicates the flow direction of the wastewater, arrow B indicates the flow direction of the sludge, and arrow C indicates the flow direction of the treated water. 1 to 5 show a first embodiment. In the figure, reference numeral 1 denotes a tank main body forming a sludge floating tank 2 and a sedimentation tank 13, which will be described later. The tank main body 1 includes a bottom plate 1A and a front plate 1
B and a rear plate 1C and a pair of side plates 1D and 1D are formed in a box shape with a bottom. By providing a partition plate 1E between the front plate 1 and the rear plate 1 located in the middle of the side plates 1D and 1D along the longitudinal direction in the tank body 1, the tank body 1 has a substantially rectangular planar shape. Sludge floating tank 2 and sedimentation tank 13 in bottom box shape
In FIG. 1, the left side of the sludge floating tank 2 is an upstream side and the right side is a downstream side. 3 is the sludge floating tank 2
In the sewage inlet provided at the position near the bottom plate 1 on the upstream side,
A sewage supply pipe 4 is inserted into the sewage inlet 3. In addition, a sewage rise guide plate 5 bent to the center side in an upside-down shape is provided upright from the bottom plate 1 in the vicinity of the downstream side of the sewage inflow port 3. A bubble discharge pipe 6 connected to an air compressor which is not provided is arranged.

Numeral 7 designates a floating substance discharge opening formed in the side plate 1D.
D is discharged to a suspended matter discharge tank 8 provided on the outer surface of D. Reference numeral 9 denotes a sludge discharge port formed in the rear plate 1C adjacent to the suspended matter discharge port 7, and a discharge pipe 10 for discharging the sludge to the outside.
Is connected. 11 is a floating substance on the floating substance discharge port 7 side,
The sludge is a guide plate installed on the downstream side of the sludge floating tank 2 to guide the sludge to the sludge discharge port 9 side. The guide plate 11 has a vertical shield plate 11A and a downstream direction from the upper end of the shield plate 11A. Inclined plate portion 11B inclined obliquely upward, and the inclined plate portion 11
A connecting plate portion 11C bent downward from the tip of B, and a guide plate protruding substantially horizontally from the lower end of the connecting plate portion 11C and inclined so that the suspended matter discharge port 7 side is high and the sludge discharge port 9 side is low. It is formed from the portion 11D.

Numeral 12 denotes sludge scraping means for scraping sludge and the like from the upstream side to the suspended matter discharge port side. The sludge scraping means 12 is separated in the longitudinal direction and is driven by a driving roller 12A which is rotatably supported on the sludge floating tank 2. And a plurality of driven rollers 12B,
, The driving roller 12A and the driven roller 1
A driving belt 12C wound around the driving belt 2B;
A plurality of scraping wings 12D erected at predetermined intervals on the top
Is connected to the drive roller 12A, and the scraping blade 12D
And a drive motor 12E for driving the rotation in the direction of the arrow. Each of the rotating scraping blades 12D scrapes sludge and the like toward the floating matter discharge port 7 and the sludge discharge port 9 while sliding on the inclined plate portion 11B.

Further, reference numeral 13 denotes a sedimentation tank formed integrally with the sludge floating tank 2 in the tank body 1. The settling tank 13 has a bottom plate 1A.
, Front plate 1B and rear plate 1C, side plate 1D, and partition plate 1
E, and the rear plate 1C is opposite to the sludge floating tank 2.
The side is upstream, and the front plate 1B side is downstream. Reference numeral 14 denotes a communication port for communicating the sedimentation tank 13 with the sludge floating tank 2, and the communication port 14 is located on the rear plate 1C side and is formed by cutting out a part of the partition plate 1E. Then, in order to remove sludge remaining on the bottom plate 1A in the sedimentation tank 13, the sedimentation tank 13 is removed.
A sludge discharge port 16 that can be opened and closed by a lid 15 is formed in the rear plate 1C.

Reference numeral 17 denotes a lower rectifying plate which is located on the downstream side in the sedimentation tank 13 and stands on the bottom plate 1A.
The upper rectifying plate is located above the rectifying plate and vertically disposed between the side plate 1D and the partition plate 1E. A sewage flow port 19 is provided between the lower rectifying plate portion 17 and the upper rectifying plate portion 18. Reference numeral 20 denotes a floating sludge / oil discharge pipe located in the sedimentation tank 13 on the upstream side of the upper straightening plate 18, and the floating sludge / oil discharge pipe 20 has a funnel-shaped opening 20A at an upper end. 1D
And a discharge pipe 20B inserted and disposed in the discharge pipe 20B.

Numeral 21 denotes a water level adjusting tank provided on the downstream side of the sedimentation tank 13, and the water level adjusting tank 21 has a rectangular bottom plate 21.
A and a U-shaped wall plate 2 standing from the outer edge of the bottom plate 21A
1B, 21C and 21D. Reference numeral 22 denotes a substantially U-shaped adjusting pipe provided in the settling tank 13 and the water level adjusting tank 21 through an insertion hole formed in the front plate 1B.
Is a tube body 2 having one side opening 23A serving as an inlet, and the other side opening 23B located higher than the one side opening 23A serving as an outlet.
3 and a cylindrical movable adjuster 24 which is slidably inserted into the other side opening 23B of the pipe main body 23 so as to be vertically movable. Reference numeral 25 denotes a treated water discharge pipe provided in communication with the water level adjusting tank 21 and connected to the filtration device side.

The present embodiment has the above-described configuration, and the sewage flowing into the sludge floating tank 2 from the sewage inflow pipe 4 rises along the sewage rise guide plate 5 and flows downstream. During this time, bubbles released from the bubble discharge pipe 6 are mixed into the sewage, and sludge and suspended matter having a low specific gravity rise near the surface of the sewage, and are scraped on the inclined plate portion 12B by the scraping blades 12D of the sludge scraping means 12. It is fried and sent out to the suspended matter discharge port 7 and the sludge discharge port 9. The sewage from which sludge and suspended matter have been removed flows into the sedimentation tank 13 through the communication port 14. In addition, the sludge and the like during the floating are prevented from flowing into the sedimentation tank 13 by the shield plate portion 12A of the guide plate 12.

While the sewage flows in the sedimentation tank 13 from the upstream side to the downstream side, the sludge and the like remaining in the sewage settle down and accumulate, or the sludge and the like floating up are removed by the sludge / oil discharge pipe 20. . By removing sludge and suspended matter in this way, the treated water purified to a wastewater standard value or less is sent from the water level adjusting tank 21 to the next treatment step via the treated water discharge pipe 25. As described above, in the present embodiment, by installing the sludge / oil discharge pipe 20 on the downstream side of the settling tank 13, sludge and the like can be more reliably removed.

Next, FIGS. 6 to 12 show a second embodiment of the present invention. In the figure, 31 is a tank body made of a steel plate. The tank body 31 has a bottom 31A conically recessed, a body 31B rising from the outer edge of the bottom 31A, and a sludge discharge port 31C formed in the center of the bottom 31A. And a bottomed cylindrical shape, and a discharge pipe 32 is provided at the sludge discharge port 31C.
Is connected. Reference numeral 33 denotes a cylindrical body having a diameter smaller than that of the tank main body 31,
Reference numeral 4 denotes a cylindrical member having a smaller diameter than the outer cylindrical partition member 33, and is inserted into the outer cylindrical partition member 33. The outer and inner cylindrical partition members 33, 34 have lower ends 33A, 34A.
Is separated from the bottom 31A of the tank body 31 to provide a gap, so that the sludge flows smoothly to the sludge discharge port 31C side when cleaning the inside of the tank body 31, thereby facilitating the sludge removal operation.

Thus, by disposing the outer tubular partition 33 and the inner tubular partition 34 inside the tank body 31,
Sludge separation tank 35, first sludge settling tank 36 in tank body 31
And a second sludge sedimentation tank 37 is defined, and the adjacent sludge separation tank 35 and the first sludge sedimentation tank 36 communicate with each other through an outer communication port 33B formed in the outer cylindrical partition wall body 33. The first sludge sedimentation tank 36 and the second sludge sedimentation tank 37 communicate with each other through an inner communication port 34B formed in the inner cylindrical partition 34. Further, the sludge separation tank 35 has an outer communication port 33B.
An outer sewage recirculation prevention plate 38 is erected between the tank body 31 and the outer cylindrical partition wall 33 along the line, and a sludge floating auxiliary plate 39 is provided on the left side in FIG. Partition body 3
3 and stands upright from the bottom 31A. Reference numeral 40 denotes a sewage supply port formed in the bottom 31A between the outer sewage reflux prevention plate 38 and the sludge floating auxiliary plate 39, and a sewage supply pipe 53 described later is connected to the sewage supply port 40. . In the first sludge settling tank 36, an inner sewage recirculation prevention plate 41 is provided upright from the bottom 31A between the outer cylindrical partition 33 and the inner cylindrical partition 34 along the inner communication port 34B. .
Are supporting legs for supporting the tank main body 31.

Reference numeral 43 denotes a sludge discharge gutter for discharging the sludge floating above the sludge separation tank 35 to the outside, and reference numeral 44 denotes a sludge discharge for discharging the sludge floating above the first sludge sedimentation tank 36 to the outside. As a gutter, the sludge discharge gutters 43 and 44 are integrally connected to an external discharge pipe 45. In addition, 4 in the figure
Reference numerals 6 and 47 denote sludge receiving plates formed of front-downward inclined plates provided in front of the sludge discharge gutters 43 and 44, respectively, and reference numerals 48 and 49 denote rear-downward inclined plates provided behind the sludge discharge gutters 43 and 44, respectively. Each of the wing slide plates 48 and 49 is for preventing the scraping blades 52E, 52E described later from repelling sewage when returning after passing through the sludge discharge gutters 43, 44. is there. Further, 50 is a sludge outflow prevention upper plate provided vertically from the tip of the sludge receiving plate 46 to the middle in the height direction, and 51 is erected from the bottom 31A to the middle position in the height direction along the outer communication port 33B. The lower plate prevents sludge from flowing out of the sludge separation tank 35 through the outer communication port 33B.
This is to prevent as much as possible from flowing into the sludge sedimentation tank 36.

Reference numeral 52 designates the sludge that has floated up,
3 and 4 show a sludge scraping device for scraping the inside of the sludge. The sludge scraper 52 includes a drive motor 52B supported by a support 52A installed on the upper end of the tank body 31, an arm support 52C mounted on the drive motor 52B,
The four arms 52D, 52D,... Protruding in the cross direction from the arm support 52C, and the sludge separation tank 35 and the first sludge sedimentation tank 36 that are swingably provided on the respective arms 52D. A scraping wing 5 that rotates on each upper side in the direction indicated by an arrow.
2E and 52E.

Reference numeral 53 denotes a sewage supply pipe for feeding sewage with air bubbles mixed into the sludge separation tank 35. The sewage supply pipe 53 includes an air compressor 54A and an air tank 54.
B, a bubble generator 54 composed of a sewage suction pump 54C, a check valve 54D and the like is connected. Reference numeral 55 denotes an auxiliary bubble generator which is provided in parallel with the bubble generator 54 and discharges air into the tank body 31. The auxiliary bubble generator 55 sucks processing water in the vicinity of a processing water inflow tank 57 described later. Pump 5
5A, the air is sucked through the water absorption pipe 55B, the air from the air tank 54B is mixed with the air, and the air is blown out.

Reference numeral 56 denotes a treated water discharge pipe inserted from the center of the tank body 31 to the outside to discharge treated water to the outside. The treated water discharge pipe 56 is formed in a substantially U-shape, and an upper end 56A positioned about 30 cm below the water surface is located at the center of the tank body 31 and opens upward, and is located outside the tank body 31. The other end 56B that extends is open to a water level adjusting device 59 described later. Reference numeral 57 denotes a cylindrical treated water inflow tank inserted in the center of the tank main body 31 so as to surround the treated water discharge pipe 56. The treated water inflow tank 57 has a treated water inflow groove 57A vertically extending from an upper end thereof. A sewage recirculation prevention plate 58 is provided on the downstream side of the treated water inflow groove 57A and between the treated water inflow tank 57 and the inner cylindrical partition wall 34 over the entire length of the treated water inflow tank 57. It is set up.

Reference numeral 59 denotes a water level adjusting device provided on the outer surface of the tank body 31. The water level adjusting device 59 can move up and down the casing 59A in which the other end 56C of the treated water discharge pipe 56 is inserted, and the casing 59A. Water discharge pipe 56 supported by
And a cylindrical adjusting body 59B slidably inserted in the casing 59A, and a water supply pipe 60 for sending out treated water to the outside is connected to the casing 59A.

This embodiment has the above-described configuration, and the operation thereof will be described next. Sewage is supplied to the sludge separation tank 35 together with air bubbles from the sewage supply port 40 via the sewage supply pipe 53. The sewage rises between the outer sludge outflow prevention plate 38 and the sludge floating auxiliary plate 39 and goes around the inside of the sludge separation tank 35. During this time, sludge and suspended matter having a low specific gravity adhere to the air bubbles and reach the surface of the sewage. Surfaces and large sludge settles. The sludge that has surfaced is swept by blades 52E of the sludge sweeper 52.
Thus, the sludge is collected by the sludge discharge gutter 43 and discharged to the outside. The sewage in which the sludge remains is the outer sewage reflux prevention plate 38.
From the outside communication port 33B to the first sludge sedimentation tank 3
In this case, the sludge outflow prevention upper plate 50 and the sludge outflow prevention lower plate 51 cause the floating sludge to flow into the first sludge settling tank 3.
6 is prevented as much as possible.

The sewage flowing into the first sludge sedimentation tank 36 makes a round, during which the sludge in the sewage is settled, and the sludge that has floated is raked by the rake blades 52E into the sludge discharge gutter 43 and discharged to the outside. You. The sewage that has made one round is blocked by the inner sewage recirculation prevention plate 41 and flows into the second sludge sedimentation tank 37 from the inner communication port 34B, and sludge is settled while making one round. The sewage that has made a round in the second sludge sedimentation tank 37 is blocked by the sewage recirculation prevention plate 58 and flows into the treated water inflow tank 57 from the treated water inflow groove 57A. Thereby, the flow rate of the sewage can be reduced, and the incorporation of sludge into the treated water can be prevented as much as possible. Further, since the treated water discharge pipe 56 is located at the upper end of the treated water inflow tank 57, that is, about 30 cm below the water surface, clean water in which oil may remain may flow into the treated water discharge pipe 56. Nothing. In addition, the sewage hardly flows below the second sludge settling tank 37 and the treated water inflow tank 57 and is in a stationary state. Thus,
By removing sludge having a small specific gravity and sludge having a large specific gravity and removing oil, the wastewater is purified and becomes treated water, flows into a water level adjusting tank 59 from a treated water discharge pipe 56, and is filtered from a water supply pipe 60 to a filtration device (not shown). Sent to the side.

[0030]

The present invention has the following advantages because it is constructed as described above. (1) The sludge floating tank and the sludge sedimentation tank according to the first aspect of the present invention, and the sludge separating and the sludge sedimentation tank according to the second aspect of the present invention reliably separate the floating sludge and suspended matter from the settling sludge. Because sludge was not mixed into the treated water,
Sewage can be purified below the wastewater standard value,
It is possible to eliminate a situation in which the filtering device installed downstream is clogged in a short period of time. (2) According to the second aspect of the present invention, sludge and the like are removed by the sludge scraper in the sludge separation tank and the sludge sedimentation tank, so that the sludge and the like can be more reliably removed. (3) As described above, since the treated water from which the sludge has been removed is supplied to the filtration device, clogging can be prevented as much as possible, the treatment efficiency of the entire sewage purification system can be improved, and maintenance work can be performed. The burden on the user can be reduced. (4) A treated water inflow tank having a longitudinally formed treated water inflow groove is provided so as to surround the treated water discharge pipe, and a sewage recirculation prevention plate is provided between the treated water inflow tank and the cylindrical partition wall. Thereby, the flow rate of the sewage is reduced as much as possible to prevent sludge or the like from flowing into the effluent discharge pipe, and more purified effluent can be supplied to the filtration device side.

[Brief description of the drawings]

FIGS. 1 to 5 relate to a first embodiment of the present invention, and FIG. 1 is a plan view of an apparatus for purifying sludge-containing wastewater.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken in the direction of arrows III-III in FIG.

FIG. 4 is a sectional view taken in the direction of arrows IV-IV in FIG.

FIG. 5 is a sectional view taken in the direction of arrows VV in FIG. 1;

6 to 12 relate to a second embodiment, and FIG. 6 is a plan view of a device for purifying sludge-containing wastewater.

FIG. 7 is a sectional view taken along the line VII-VII in FIG.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is an enlarged sectional view taken in the direction of arrows IX-IX in FIG. 6;

FIG. 10 is an enlarged sectional view taken in the direction of arrows XX in FIG.

FIG. 11 is an enlarged perspective view of a main part showing a treated water inflow tank and a sewage recirculation prevention plate with a part of the inner cylindrical partition wall cut away.

FIG. 12 is an enlarged sectional view of a sludge discharge gutter portion.

FIG. 13 and FIG. 14 are related to the prior art, and FIG.
FIG. 2 is a plan view of a purification device for sludge-containing wastewater.

FIG. 14 is a sectional view taken in the direction of arrows XIV-XIV in FIG.

FIG. 15 is a longitudinal sectional view of a sludge-containing wastewater purifying apparatus according to another conventional technique.

[Explanation of symbols]

 2 Sludge floating tank 3 Sewage inlet 5 Sewage rise guide plate 6 Bubble discharge pipe 7 Floating matter discharge port 12 Sludge and other scraping means 13 Sedimentation tank 14 Communication port 17 Lower rectifying plate 18 Upper rectifying plate 20 Sludge / oil discharge pipe 21 Water level Adjustment tank 25 Treated water discharge pipe 31 Tank body 31A Bottom part 31B Body part 31C Sludge discharge port 33 Outer cylindrical partition wall 34 Inner cylindrical partition wall 35 Sludge separation tank 36 First sludge settling tank 37 Second sludge settling tank 38 , 41, 58 Sewage reflux prevention plate 43, 44 Sludge discharge gutter 56 Treated water discharge pipe 57 Treated water inflow tank 57A Treated water inflow groove 59 Water level adjusting device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 1/40 C02F 1/40 C

Claims (5)

[Claims] A sludge levitation tank to which sewage and air bubbles are supplied from a lower portion on an upstream side; and a sewage rise guide plate located downstream from a supply position of the sewage and erected on an upstream side of the sludge levitation tank. A sludge discharge port provided on the downstream side of the sludge floating tank,
A sludge scraping means disposed above the sludge floating tank to scrape sludge and the like to the sludge discharge port side; a sludge sedimentation tank into which wastewater flows in from a downstream side of the sludge floating tank through a communication port; A water level adjusting tank disposed in communication with the downstream side of the sedimentation tank, a treated water discharge pipe provided in the water level adjusting tank and sending out treated water to the filtration device side, and a sludge removing port provided in the sludge sedimentation tank. A sludge-containing sewage purification device comprising a device. 2. The apparatus for purifying sludge-containing sewage according to claim 1, further comprising an oil or other discharge pipe located downstream of the sludge settling tank. 3. The apparatus for purifying sludge-containing wastewater according to claim 1, wherein a straightening plate is provided upright on the downstream side of the sludge settling tank. 4. A bottom portion comprising a conically concave cylinder,
A tank body having a sludge discharge port in the center of the bottom, an outer sludge separation tank and an inner sludge settling tank defined by a plurality of cylindrical partition walls concentrically inserted into the tank body; A sewage recirculation prevention plate erected between the main body and the cylindrical partition body, and a sewage water of the sludge separation tank formed on the one cylindrical partition body positioned upstream of the sewage recirculation prevention plate. An upstream communication port through which the wastewater flows into the sludge sedimentation tank side, and is formed on the other cylindrical partition wall located on the upstream side of the wastewater recirculation prevention plate, and transfers the wastewater from the one inner sludge sedimentation tank to the other inside. A downstream communication port for flowing into the sludge sedimentation tank, a sludge discharge part provided on the upper side of the sludge separation tank and the inner sludge sedimentation tank, and discharging the floating sludge to the outside, and a rotatable upper part of the tank main body. Sludge scraper that is provided and scrapes the rising sludge to the sludge discharge section side And a sewage supply port for supplying sewage into the sludge separation tank and a bubble discharge port for releasing bubbles provided in the tank main body, and treated water disposed at the center of the tank main body for sending treated water to the filtration device side. An apparatus for purifying sludge-containing wastewater, comprising a discharge pipe and a water level adjusting tank provided in communication with the treated water discharge pipe. 5. A treated water inflow tank having a longitudinally formed treated water inflow groove surrounding the treated water discharge pipe is provided in the tank body, and the treated water inflow tank and the other cylindrical partition are provided. 5. The apparatus for purifying sludge-containing wastewater according to claim 4, wherein a wastewater recirculation prevention plate is provided between the sludge and the body.