JP2003033770A - Wastewater treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain purified water efficiently by removing impurities, which float in water. SOLUTION: The interior of an effluent tank 16D is partitioned into an inlet region 52 and a recovery region 53 by a partition plate 51 and a filter conveyor 55 is equipped. An edgeless filter 60 is circulated in arrow direction on the condition of being sunk under water, and a portion 55A, which is driven from the inlet region 52 to the recovery region 53, is arranged so as to have an uphill slope of 40 degrees to 50 degrees. A drainage pipe 65 is provided in the inner side of the filter conveyor 55 at the inlet region 52. Wastewater, which flows in the inlet region 52, is sucked into the inner side thereof through the edgeless filter 60 by being made the drainage pipe 65 into negative pressure and a floating substance in wastewater is trapped on the surface of the edgeless filter 60. The trapped floating substance is conveyed to the recovery region 53 side and detached from the surface of the edgeless filter 60 into the recovery region 53 at the position where the edgeless filter returns downward. During this time, purified water, in which the floating substance is removed, is taken out continuously from the drainage pipe 65.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment apparatus utilizing electrolysis, and more particularly to improvement of the structure of a portion for removing floating impurities.

[0002]

2. Description of the Related Art Conventionally, as a device for purifying a large amount of sewage, a meandering water flow passage is formed by arranging a partition wall in a treatment tank, and the water flow passage is configured to cross the flow passage. It is known that a plurality of electrode plates having opposite polarities are alternately arranged side by side with each other, and impurities in water are aggregated while wastewater passes through the electrode plate group, thereby purifying water. ing. Impurities are roughly classified into those that precipitate, those that float in water, and those that float on the surface of water, depending on the difference in specific gravity and the like.

Of these, precipitates and floating substances on the surface of the water can be removed relatively collectively by sucking with a pump (disclosed in Japanese Patent Laid-Open No. 2000-189974). No such removal means can be adopted. Therefore, conventionally, the treated water treated in the treatment tank was once pumped to a separately settling tank, the suspended matter was allowed to settle over time, and then the supernatant portion was taken out as final purified water. .

[0004]

In the conventional method, however, it takes a long time to obtain the final purified water because it takes a long time to precipitate and separate the suspended matter in the settling tank. There was a problem that it could not be obtained continuously, and further improvement was eagerly awaited. The present invention has been completed based on the above circumstances, and an object thereof is to effectively remove impurities suspended in water to efficiently obtain purified water.

[0005]

As a means for achieving the above-mentioned object, the invention of claim 1 is such that electrode plates having opposite polarities are opposed to each other in a treatment tank in which a water flow passage is formed. A sewage treatment apparatus which is arranged so that impurities in sewage can be separated by electrolysis while sewage is passed between the electrode plates. An inflow area where sewage flows in by a plate,
It is divided into a collection area that precipitates impurities,
A conveyor equipped with an endless filter that can circulate
It is characterized in that it is provided from the inflow region to the recovery region, and a drain port connected to a pump is provided inside the conveyor in the inflow region.

According to a second aspect of the present invention, in the first aspect of the present invention, the transport-side traveling portion of the conveyor from the inflow area side to the recovery area side is in a posture in which it is directed obliquely upward. However, it has a feature. Claim 3
The invention according to claim 1 or 2, wherein a water injection unit for injecting water toward the inner surface of the traveling unit is provided inside the traveling unit that returns through the recovery area of the conveyor. It has a feature that is provided.

[0007]

<Advantages and effects of the invention><Invention of claim 1> The sewage flowing into the inflow area is sucked inward by passing through the conveyor or the filter when the drain port is tilted to a negative pressure, and accordingly, into the sewage. The suspended impurities are captured on the surface of the filter. The captured impurities are conveyed to the collection area side as the conveyor travels, and are separated from the filter into the collection area at a portion where the conveyor returns, and settle on the bottom of the collection area. The precipitated impurities are appropriately removed. During this time, the purified water from which the suspended matter has been removed by being taken into the inside of the conveyor as described above is continuously taken out from the drain port. It is possible to efficiently and continuously take out purified water while effectively removing impurities floating in water with a filter that constitutes a conveyor.

<Invention of Claim 2> When the transport side traveling portion of the conveyor travels in the water obliquely upward with respect to the collection area side, the impurities trapped by the filter are released from the filter or reversely. Good transfer to the collection area without clogging the filter. <Invention of Claim 3> By injecting water on the back surface of the return side traveling portion, the impurities trapped on the front surface side are blown out to the recovery area side, and clogging is more reliably prevented.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
Or, it demonstrates based on FIG. In FIGS. 1 to 4, reference numeral 10 denotes a processing tank, which is formed in a box shape with an upper surface opening slightly elongated in the left-right direction as a whole. More specifically, as shown in FIG. 4, at the upper end of the front side surface (right side in the figure) of the processing tank 10, a receiving edge in the shape of a shallow dish like three sides other than the inside surrounded by side walls is formed. 11 is formed so as to horizontally project toward the front side, and at the upper end of the back side surface,
A relief edge 12 that is inclined obliquely upward to the back side is formed, and as will be described later, when the waste water is introduced into the treatment tank 10 and flows, the water surface is slightly above the bottom plate of the receiving edge 11. W is set to come.

As shown in FIG. 2, the inside of the processing tank 10 is divided into four chambers by three partition walls 14 standing from the inner bottom surface thereof. Here, the rightmost chamber is wider than the other three chambers. Each partition wall 14
Has a height dimension such that its upper end is located slightly below the water surface W. Also, the left side 3 mentioned above
An intermediate partition plate 15 is provided in the middle of each of the chambers. The intermediate partition plate 15 is provided so as to hang down from the upper end of the processing tank 10 to a position slightly above the inner bottom surface. As described above, in the processing tank 10, as shown in FIG. 2, seven tanks that are vertically connected in a meandering shape are provided.
Functionally roughly divided, the leftmost chamber is the water receiving tank 16A,
The two chambers on the right side are the electrolysis tank 16B and the next three chambers are the precipitation tank 16B.
C, the last large room at the right end is the drain tank 16D.

On the left side surface of the water receiving tank 16A, a water receiving port 18 is opened at a position higher than the water surface W, and the water supply pump 1 is provided there.
The water supply hose 20 provided in FIG. 9 is connected so that sewage can be sequentially supplied into the water receiving tank 16A. A large number of electrode plates 22 are provided in the lower portion of the electrolytic cell 16B at predetermined intervals in the front-rear direction. These electrode plates 2
2 is a square shape, with the plate surface facing forward and backward,
Intermediate partition plates 15 on both sides of the partition wall 14 penetrating left and right
It is provided so that it can be passed between. These electrode plates 22 are connected to a DC power source (not shown) so as to alternately have positive and negative electrodes, and as is well known, they function to aggregate impurities in water by electrolysis.

The upper surface of the processing tank 10 is equipped with a scraper 25 for scraping and transferring impurities floating on the water surface W, including those aggregated by electrolysis.
The scraper 25 is installed in the water receiving tank 16A, installed over the two electrolytic tanks 16B, installed over the two settling tanks 16C on the left side, and installed over the remaining settling tank 16C and the drainage tank 16D. It is equipped with four conveniences. These have different width dimensions corresponding to the tanks to be equipped, but the basic structure is the same.

In the scraper 25, as shown in FIGS. 4 and 5, an endless belt 28 is stretched between a pair of front and rear drive rollers 26 and a driven roller 27, and in the direction of the arrow in FIG.
The endless belt 28 is provided with two scraping plates 30 at symmetrical positions on the outer surface of the endless belt 28 so as to circulate at a slow speed for several minutes on one way. This scraper 25 is provided at a height position just above the opening edge of the processing tank 10 with the drive roller 26 at a position substantially corresponding to the base of the receiving edge 11 and the driven roller 27 positioned before the escape edge 12. Has been done.

The scraping plate 30 has substantially the same width as that of the endless belt 28, and the scraping part 32 is swingably connected to the base part 31 so that the scraping part 30 can be bent in the center.
Is fixedly erected in a vertical posture with respect to the outer surface of the endless belt 28. Therefore, while the scraping plate 30 is rotating to the lower traveling portion, as shown by the leftmost chain line in FIG.
The base portion 31 and the scraping portion 32 run in a straight line in a hanging posture, and at this time, the lower end of the scraping portion 32 is in a state of plunging below the water surface W. On the other hand, when it moves to the upper traveling portion, it is folded in the middle, and finally the base portion 31 and the scraping portion 32 are configured to travel in a posture in which the front portion and the rear portion overlap each other (see FIG. 4). The drive rollers 26 of the scrapers 25 are connected to each other so that the scrapers 25 can integrally circulate.

On the bottom plate of the receiving edge 11 described above, an inclined plate 35 is formed over its entire width (left and right direction in FIG. 3), reaching from the root position to a position slightly less than half in the projecting direction. The inclined plate 35 has a gentle upward slope of about 20 degrees. At the tip of the upper edge of the inclined plate 35, the gutter portion 37
Is also formed over the entire width. The gutter portion 37 is formed so as to have a very gentle downward gradient (about a few mm lower per 1 m) from the drain tank 16D side toward the water tank 16A side (arrow direction in FIG. 3). However, the height of the bottom of the lowest water receiving tank 16A side is set to be higher than the water surface W of the processing tank 10. An outlet 38 is opened on the side wall of the lowest part of the gutter 37, and the return pipe 39 drawn out from the outlet 38 has a slightly downward slope, which is higher than the water surface W on the left side surface of the water receiving tank 16A. It is connected to the return port 40 opened at the position.

As shown in FIG. 5, the outer edge of the above-mentioned trough portion 37 rises with a gentle inclination to a position slightly higher than the inner edge side, and a side plate perpendicular to the bottom plate of the receiving edge 11 from this outer edge. 41 are formed. This side plate 41 and the receiving edge 1
A discarding groove 42 is formed between the first side wall 11A and the side wall 11A. The bottom of the discard groove 42 is opened, and a recovery groove body 44 is provided on the outer bottom of the discard groove 42 over the entire width thereof so as to close the opening. As shown in FIG. 1, the groove bottom of the recovery groove body 44 is formed in a downward slope from the water receiving tank 16A toward the drain tank 16D, and the recovery port 4 is formed at the lowest position of the groove bottom.
5 is formed downward.

In the drainage tank 16D at the final stage of the processing tank 10,
As shown in detail in FIG. 6, the bottom plate 50 is raised in a chevron shape having a vertex at a position slightly to the right of the center portion in the left-right direction in the figure, and the partition plate 51 extends from the top of the bottom plate 50.
Has been launched. This partition plate 51 is used for the settling tank 16
It is formed at a back height lower than the partition wall 14 that partitions it from C, and the inside of the drainage tank 16D is formed by this partition plate 51.
The left side is divided into an inflow region 52, and the right side is divided into a recovery region 53.

The drainage tank 16D includes a filter conveyor 55.
Is equipped with. The filter conveyor 55 has a width substantially equal to the depth dimension of the drainage tank 16D. More specifically, a drive roller 56 is provided at a position slightly lower than the center height position in the inflow region 52 and close to the partition wall 14 between the settling tank 16C and the inflow region. Partition plate 51 at the same height as 52
And tension rollers 57 and 58 are respectively provided at a position closer to the partition plate 51 and a position closer to the partition plate 51 in the collection area 53 and a little higher than the upper end thereof, and between these rollers 56 to 58. Endless band filter 60
Have been passed over. The endless filter 60 is stretched on the outer surface of the endless band-shaped mesh as a base. In addition, the partition plate 51 described above includes an endless filter 60.
An escape groove 62 that allows the vehicle to travel is formed.

Therefore, when the drive roller 56 is driven, the endless filter 60 is circulated in the direction of the arrow in FIG.
The portion 55A traveling toward 3 has an upward slope of 40 to 50 degrees. A drain pipe 65 is provided at a position inside the filter conveyor 55 in the inflow region 52. This drain pipe 65 is, as shown in FIG.
6D is projected from the back surface toward the front side to a substantially central position in the depth direction, and a drain hose 67 provided with a drain pump 66 is provided at a portion of the drain pipe 65 protruding outside the tank. Are connected. The tip of the drain hose 67 is led to a predetermined drainage location.

Similarly, in the inflow region 52, the endless filter 6
A water injection pipe 69 is provided immediately behind the portion of the partition wall 14 that travels in the escape groove 62 of 0.
The water injection pipe 69 is provided so as to project from the back surface of the drainage tank 16D to the front surface over substantially the entire depth dimension, and the front end surface is closed and the endless filter 6 is provided.
A large number of ejection openings (not shown) are opened in a line on the surface opposite to the back surface of 0. And drainage tank 1
A part of the water drawn from 6D is pressure-fed to the water injection pipe 69, and is sprayed on the back surface of the endless filter 60 with extremely low pressure from each ejection port as shown by the arrow in FIG. There is.

Further, one of the treatment baths 10 is an electrolytic bath 1
6B, two settling tanks 16C, and drainage tanks 16D are respectively provided with sediment discharge pipes 71 at the bottoms of the inflow region 52 and the recovery region 53 so as to project from the inner surface by a predetermined dimension. A portion of each of the discharge pipes 71 drawn out of the tank merges into a single drain hose 72, and the drain hose 72 is provided with a discharge pump 73.

Next, the operation of this embodiment will be described. In operation, the water supply pump 19 and the drainage pump 66 are continuously driven, and a DC voltage is applied to the electrode plate 22. That is, the dirty water to be treated is sucked up by the water supply pump 19 and discharged from the water inlet 18 into the water receiving tank 16A of the processing tank 10. As shown by the arrow in FIG. 2, this wastewater reaches the drainage tank 16D from the water receiving tank 16A through the meandering electrolytic tank 16B and the sedimentation tank 16C in this order. Here, out of the garbage contained in the dirty water,
Those having a small specific gravity float on the water surface W, and those having a large specific gravity settle on the bottom of the processing tank 10. In addition, impurities in water are aggregated while passing through the electrode plate 22 group of the electrolytic cell 16B, and the aggregated impurities having a small specific gravity are floated on the water surface W as levitation objects x, and conversely have a large specific gravity. Becomes a sediment, and the intermediate one becomes a suspended matter and becomes a state of being suspended in water.

The scraper 25 is driven to remove the floating object x. Scraping plate 3 that turns to the lower traveling part
0 runs in a state in which the lower end of the scraping portion 32 is projected below the water surface W with the one plate hanging down, and the floating object x on the water surface W
Carry it toward the receiving edge 11 side while pressing. When reaching the position of the receiving edge 11, as shown in FIG. 5, the scraping plate 30 is bent in the middle and moves up the inclined plate 35 to transfer the floating object x to the trough 37. While climbing up the inclined plate 35, a part of the water pushed together flows down along the inclined plate 35 and is returned to the processing tank 10. In the trough portion 37, the water sinks due to its own weight, and the bottom portion thereof follows the slope and flows down toward the water receiving tank 16A side. The water flowing down to the end is returned to the water receiving tank 16A by the return pipe 39.

By repeating the above, only the floating object x is mainly left in the trough 37, and as shown by the chain line in FIG.
It gradually rises. On the other hand, scraper 25
From the time when the scraping part 32 separates from the upper edge of the inclined plate 35, only the scraping part 32 takes a hanging posture and turns to the upper traveling part side, and floats on the trough part 37 as described above. When the object x is raised, the scraping portion 32 presses the floating object x and drops it into the discard groove 42 outside the trough portion 37, as shown by the arrow in the figure. This is further dropped into the recovery groove body 44 arranged on the lower surface side, slides down along the inclination of the groove bottom, and is taken out from the lowest recovery port 45. The floating objects x taken out are collectively discarded. In addition, during this period, the discharge pump 73 is appropriately driven, and the precipitate in the processing tank 10 is drawn from the discharge pipe 71 into the drain hose 72.

Although the float x and the precipitate are removed as described above, the float still remains in the water. Therefore, the filter conveyor 55 installed in the drain tank 16D
Is driven. That is, the inflow region 52 of the drainage tank 16D
The wastewater that has flowed into the filter conveyor 55, that is, the endless filter 60, is caused by the drain pipe 65 being tilted to a negative pressure.
Is sucked inward through the flow path and the suspended matter in the dirty water is captured by the surface of the endless filter 60 of the inclined traveling portion 55A. The trapped suspended matter is conveyed to the collection area 53 side as the filter conveyor 55 travels, turns the tension roller 58, and returns downward.
The endless filter 60 is separated from the surface into the recovery area 53. Further, the endless filter 60 allows the escape groove 6 of the partition plate 51 to be released.
When passing through 2, water is sprayed from the water injection pipe 69 toward the back surface of the endless filter 60 at a very low pressure, and the suspended matter that has been clogged is sprayed toward the recovery area 53.

These suspended matters gradually settle on the bottom of the recovery area 53, and this sediment is discharged by the discharge pump 73 described above.
Is drawn from the discharge pipe 71 into the drain hose 72, and is discarded together with other precipitates. During this time,
The purified water from which the suspended matter is removed as it is taken into the inside of the filter conveyor 55 as described above is discharged into the drain pipe 65.
Through the drain hose 67 to the predetermined drainage place continuously.

As described above, according to this embodiment,
While the impurities floating in water are effectively removed by the endless filter 60 which constitutes the filter conveyor 55, the purified water can be efficiently and continuously taken out. In particular, since the portion 55A that traps the suspended matter and travels from the inflow area 52 to the recovery area 53 is configured to travel obliquely upward in the water, the captured suspended matter is removed from the endless filter 60. The endless filter 60 is satisfactorily conveyed toward the collection area 53 side without being detached or conversely clogging the eyes of the endless filter 60. Further, when the endless filter 60 passes through the escape groove 62 of the partition plate 51, water is blown from the water injection pipe 69 to the back side thereof at an extremely low pressure, so that floating matters are blown off and clogging is more reliably prevented. To be done.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition to the above, various modifications can be made without departing from the scope of the invention. (1) In the above embodiment, the drainage tank is continuously provided in the latter stage of the settling tank, but the drainage tank is provided as a separate body so that the drainage pumped from the final settling tank is introduced again into the separate drainage tank. You may (2) Regarding the inclination angle of the portion of the filter conveyor that captures suspended matter and travels from the inflow region to the recovery region, the one illustrated in the above embodiment is merely an example, and is arbitrarily selected according to conditions and the like. It is possible.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a sewage treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a processing tank.

FIG. 3 is a plan view thereof

FIG. 4 is a side sectional view thereof.

FIG. 5 is a partially enlarged cross-sectional view showing a floating object removing structure.

FIG. 6 is a partially enlarged vertical sectional view showing a structure for removing suspended matter.

[Explanation of symbols]

10 ... Treatment tank 16D ... Drainage tank 22 ... Electrode plate 50 ... Bottom plate (bottom surface) 51 ... Partition plate 52 ... Inflow area 53 ... Recovery area 55 ... Filter conveyor 55A ... (tilted) running section 60 ... Endless filter 62 ... escape groove 65 ... Drain pipe (drain port) 66 ... Drainage pump 67 ... Drain hose 69 ... Water injection pipe

Claims (3)

[Claims] 1. An electrode plate having opposite polarities is disposed oppositely in a treatment tank in which a water flow passage is formed. Impurities in the wastewater are electrolyzed during the passage of the wastewater between the electrode plates. In the sewage treatment apparatus configured to separate the, in the end part of the treatment tank, the inside of the tank is divided into an inflow region into which sewage flows by a partition plate that is erected from the bottom surface, and a recovery region in which impurities are precipitated, A conveyor provided with an endless filter so as to be able to circulate is provided from the inflow region to the recovery region, and a drain outlet connected to a pump is provided inside the conveyor in the inflow region. Sewage treatment equipment to be. 2. The sewage treatment apparatus according to claim 1, wherein the transport-side traveling portion of the conveyer from the inflow region side toward the recovery region side is in a posture in which it is directed obliquely upward. 3. A water injection unit for injecting water toward the inner surface of the traveling unit is provided inside the traveling unit that returns through the recovery area of the conveyor. The sewage treatment apparatus according to claim 1 or claim 2.