JPH0555162B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a wastewater treatment device, and particularly to a wastewater treatment device that treats wastewater containing suspended solids of various properties by a solid-liquid separation method in a stationary state. Regarding.

(Problems with the prior art) Conventionally, there are various types of devices that can easily treat wastewater, such as those that use the difference in specific gravity to settle and separate solids in a sedimentation tank or the like, or those that combine this with a bathtub, a filter, etc. This type of device is widely known.
However, when the water to be treated contains various suspended solids having relatively small particle sizes, it is not always easy to separate them using such conventional devices. Furthermore, it is necessary to use devices with various configurations depending on the type of suspended matter, and in order to obtain a practically sufficient treatment effect, the scale of the device is often increased, and the cost of equipment and maintenance increases.

(Object of the Invention) The object of the present invention is to provide a wastewater treatment device that eliminates the drawbacks of the prior art and can efficiently treat wastewater containing various suspended solids to an acceptable level with a simple structure. Our goal is to provide the following.

(Structure of the Invention) To achieve the above object, the wastewater treatment apparatus of the present invention has an inlet for treated water containing fine suspended solids and an overflow port for treated wastewater at the upper end thereof. A treatment tank has a discharge port for suspended matter that has been settled and separated from the water to be treated at the lower end, and a treatment tank that is vertically disposed from the upper end to the lower end of the inside of the treatment tank and is connected to the water to be treated. a partition tube that partitions into a settling region and a water flow reversal rising region that communicates with the settling region near the lower end; a settling pipe connected to the inlet, the lower end of which is opened toward the outlet of the suspended solids at a position above the lower end of the partition tube, and has a large number of through holes formed in the wall. , a tank wall at a lower end of the processing tank, which faces the lower end of the partition tube that partitions the settling region and the inversion rising region through a narrow communication gap, is inclined upward at a predetermined angle. The treatment tank is characterized in that a discharge pipe whose height can be adjusted is connected to the discharge port of the suspended solids in the treatment tank.

(Embodiments of the Invention) More specific configurations of the present invention and the effects obtained based thereon will be explained in more detail below based on embodiments shown in the drawings.

FIG. 1 and FIG. 2 are a top view and a vertical sectional view, respectively, showing an outline of an embodiment of a wastewater treatment apparatus according to the present invention.

In the figure, a vertical cylindrical treatment tank 4 with a circular cross section introduces wastewater to be treated from an inlet 1 at the upper end, as will be described later, and suspended suspended matter in the wastewater is sedimented and separated in the tank. is discharged in the form of concentrated slurry from a discharge port 3 at the lower end, and treated wastewater is discharged to the outside from an overflow port 2 at the upper end.

Inside the treatment tank 4, a cylindrical partition tube 6 with a circular cross section is vertically installed from the upper end to the lower end, and the inside of the treatment tank 4 is divided into a sedimentation area 5 for wastewater and an inversion and rise area for wastewater after treatment. It is divided into Area 7.

The lower end of the partition tube 6 is opened toward the discharge port 3 of the suspended solids at the lower end of the processing tank 4 .
The opening edge of this hanging lower end is opposed to the peripheral wall of the lower end of the processing tank 4 with a predetermined gap D therebetween, and allows the water flow to descend through the settling area 5 formed inside the partition tube 6. The wastewater is inverted and raised through the gap D, and is raised in the inverted and raised area 7 of the wastewater outside the partition plate 6 toward the upper end of the treatment tank 4.

Here, the peripheral wall of the processing tank 4, which faces the vertical lower end of the partition tube 6 with a gap D therebetween, is inclined upward at a predetermined angle.

Further, inside the partition tube 6, a cylindrical settling pipe 8 also having a circular cross section is vertically disposed concentrically with a radial gap with respect to the partition tube, and an inlet for the waste water is provided at the upper end of the tube. 1 is connected, and its lower end is opened to the suspended matter discharge port 3 side in the same way as the lower end of the partition tube 6. A large number of through holes 9, 9, . It is configured to communicate with the sedimentation area 5.

Furthermore, in the illustrated embodiment of the present invention, a discharge pipe 10 is connected to the concentrated slurry discharge port 3 at the lower end of the processing tank 4, and is raised along the side wall of the processing tank 4 almost to its upper end. There is. Discharge pipe 10
The upper discharge end 10A is formed of a large flexible plastic pipe or the like, and by bending this, the relative height of the upper end of the discharge pipe with respect to the water surface of the treatment tank 4 can be adjusted. ing. 10
B is a support member for the discharge pipe.

(Functions and Effects) When treating wastewater containing suspended solids with the wastewater treatment apparatus shown in FIGS. Inject gradually. During the progress of the treatment, suspended solids that have settled and been separated from the wastewater are accumulated near the discharge port 3 at the lower end of the treatment tank 4, and are removed from the discharge pipe 10 as necessary.
is discharged through. On the other hand, the discharge after treatment is continuously drawn out from the overflow port 2 provided at the top of the water flow reversal and rise area 7 of the treatment tank 4.

Here, the wastewater in the sedimentation area 5 of the partition tube 6 gradually moves downward due to the wastewater continuously injected from the upper part of the sedimentation pipe 8, and the periphery of the hanging lower end of the partition tube 6 and the treatment tank 4. The direction of the flow is reversed through the gap D with the lower end and enters the rising region 7 of the water flow between the outside of the partition tube 6 and the processing tank 4 . The wastewater that has entered the rising region 7 is raised by the water pressure of the wastewater continuously injected into the settling pipe 8, and is drawn out from the overflow port 2 at the top end as treated wastewater.

On the other hand, the suspended solids contained in this wastewater are carried downward in the settling area 5 as the wastewater is injected from the inlet 1 into the upper part of the settling pipe 8 and moves downward. In this case, if the capacity of the treatment tank 4 (approximately 12 cm ³ in this example) is made sufficiently large compared to the amount of wastewater injected (e.g. 200/min), the rate of descent of the wastewater in the sedimentation area 5 can be reduced. becomes extremely gradual. In particular, most of the wastewater injected into the settling pipe 8 passes through a through hole 9 drilled in the peripheral wall of the pipe and is once discharged horizontally into the gap between it and the partition cylinder 6, and then flows into the cylinder. Since it takes a descending path, the suspended solids descending through the sedimentation area 5 gradually move downward over a long period of time through a relatively long flow path as a whole. When reaching the lower end of the partition tube 6, most of the suspended matter is separated from the water and deposited near the discharge port 3.

Here, some of the suspended solids with small particle sizes try to float up along with the drainage that reverses upward through the gap D at the vertical lower end of the partition tube 6, but from the gap D with a narrow opening area, a larger part The floating suspended matter loses almost no kinetic energy when exiting the inversion rising region 7,
Most of the waste is deposited in the discharge port 3 along the slope of the lower end of the processing tank 4. Thereafter, while rising in the inversion rising area 7 along with the drainage water, a considerable portion of the remaining suspended solids contained therein further settles and is drawn out from the overflow port 2 at the top end of the rising area 7. The suspended solids remaining in the wastewater after treatment are only particles smaller than about 300 mesh in particle size.
In this example, as a result of continuously treating wastewater with an ss concentration of approximately 200 ppm using the equipment specifications and treatment conditions described above, the ss concentration of the resulting treated wastewater was approximately 20 ppm.
decreases to

On the other hand, the suspended solids that have been sedimented and separated from the wastewater and deposited at the discharge port 3 at the lower end of the treatment tank 4 are pushed by the water pressure in the tank and rise through the discharge pipe 10, and rise to the water surface of the treatment tank 4. The discharge end 10 is located near the height of
It is discharged from A to the outside of the tank in the form of a concentrated slurry. For example, if the height of the discharge end 10A is set higher than the water surface of the treatment tank 4 during wastewater treatment work, the slurry will not be discharged, and at the desired time, the flexible discharge end 10A can be lowered. By bending the pipe to lower its height below the water surface, the thick slurry inside the pipe is discharged to the outside of the tank. In this case, if the lower discharge pipe 10 is removed from the support member 10B and the height of the discharge end 10A is significantly lowered, the deposits in the tank will be discharged at once together with the waste water, and the inside of the treatment tank 4 will be easily cleaned. .

As described above, in the embodiment of the present invention, after the wastewater injected into the treatment tank 4 is lowered through the sedimentation area 5 which is divided and formed in the tank by the partition pipe 6, the vertical installation of the partition pipe 6 is performed. Since the wastewater is inverted and raised to the overflow port 2 side of the inversion and rise area 7 through the narrow gap D between the lower end and the lower end of the treatment tank 4, the suspended solids contained in the wastewater are removed from the wastewater. During settling and rising, solid and liquid are separated and deposited on the bottom of the tank.

Particularly, in the embodiment of the present invention, a settling pipe 8 is further provided in the settling area 5 of the partition tube 6, and the flow of the waste water is changed horizontally through a number of through holes 9 bored in the peripheral wall of the settling pipe 8. Since the waste water is allowed to flow out into the region 5, the flow path length of the waste water in the tank is increased, and the flow is extremely slow and undisturbed. Therefore, most of the suspended solids contained in the wastewater can be gradually settled and separated, efficiently deposited on the discharge port 3 side, and separated from the wastewater.

Furthermore, in this embodiment, a siphon type discharge pipe 10 is connected to the discharge port of the suspended solids at the lower end of the treatment tank 4, so that the settled solids can be extremely easily discharged and recovered from the tank. can. In other words, by setting the height of the upper end of the discharge pipe 10 to be somewhat lower than the water level in the treatment tank, the precipitated solids can be continuously discharged by water pressure, and the solid content can be compared. In the case of wastewater with a small amount of wastewater, the height of the discharge pipe can be lowered to discharge the slurry at once only when necessary. Such adjustment can be easily performed by forming the discharge pipe end 10A from a highly flexible material. Furthermore, if the entire discharge pipe 10 is removed from the support part 10B and the end is pulled down significantly, the deposits in the tank can be discharged all at once together with the waste water, making cleaning and maintenance of the tank extremely easy.

As described above, the embodiments of the present invention are capable of continuously settling and separating suspended substances in wastewater without requiring them to stand still for a long time using an extremely simple structure. Furthermore, this embodiment basically does not require any chemical or biochemical means for its treatment or power for operation, and therefore, once installed, it usually requires little maintenance.
No adjustment is required.

In this example, the ss concentration of wastewater of about 200 ppm could be reduced to about 20 ppm regardless of its properties and types, and most of the suspended solids up to about 300 mesh could be removed.

However, according to the present invention, concentrated wastewater with even higher ss concentration (for example, livestock sewage with ss10,000 or more)
A similar solid-liquid separation treatment can also be carried out by diluting this appropriately with water in advance and introducing it into the treatment tank. Furthermore, if the wastewater contains metal sludge or the like and requires flocculant treatment, the floc water after such treatment can be treated in the same manner as in the treatment tank of the above embodiment.

Although the wastewater treated in the above example is of a level that is acceptable for direct discharge into rivers, etc., this example uses water supply treatment that assumes the removal of sediment, etc. and microbial activity. When used as a pre-treatment device for wastewater treatment, the load on the original treatment device can be significantly reduced. Therefore, the present invention has a wide range of uses, not only in wastewater treatment but also as a so-called solid-liquid separator or syringe, which is widely used in general water treatment.

Although the present invention has been described above with respect to an embodiment having a relatively small and compact cylindrical shape, the present invention can of course be implemented in various other forms depending on the application. for example,
The processing tank is not limited to the cylindrical shape as shown in FIGS. 1 and 2, but may be prismatic with a square cross section.
In this case, it is only necessary to change the cross sections of the processing tank 4 in FIG. 1 or, if necessary, the partition tube 6, settling pipe 8, etc., to concentric rectangular shapes. Furthermore, the shape, size, and pitch of the through-holes drilled in the settling pipe, as well as the gap D and inclination angle of the lower end of the processing tank, can be designed to have various dimensions and shapes as required.

FIGS. 3 and 4 show another embodiment of the invention suitable for treating relatively large volumes of industrial wastewater.

Among the parts shown in the embodiments of FIGS. 3 and 4, those indicated by the reference numerals corresponding to those in FIGS. 1 and 2 have the same functions as explained in the embodiments, respectively. ing. In this embodiment, the water flow reversal rising region formed between the partition tube 6 and the treatment tank 4 is divided by the separator 11 into a relatively large collection region 12 and a wastewater extraction region 13 for collection. Area 1
2 is provided with a shutter 14.

The manner in which the introduced wastewater is treated by the partition tube 6 and the settling pipe 8, etc., and the sedimented and separated slurry is taken out is basically the same as in the embodiment shown in FIGS. 1 and 2. It is.

In the embodiment of FIGS. 3 and 4, after most of the suspended solids have been separated, the waste water that reverses upward from the gap D is first directed below the collection zone 12. Here, wood chips with a low specific gravity and, in some cases, oil, etc. contained in the wastewater rapidly float to the surface, are collected on the water surface of the collection area 12, and are discharged to the outside of the tank through the shooter 14. The wastewater further gradually rises to reach the wastewater extraction area 13 and is discharged from the overflow port 15.

This embodiment can treat a large amount of wastewater, and is particularly suitable for treating factory wastewater containing a large amount of floating matter with relatively low specific gravity such as wood chips and oils.

[Brief explanation of drawings]

FIG. 1 is a top view of one embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the embodiment, FIG. 3 is a top view of another embodiment of the invention, and FIG. 4 is a longitudinal sectional view of the embodiment. It is a front view. 1...Wastewater inlet, 2...Wastewater overflow port, 3
... Sediment discharge port, 4 ... Treatment tank, 5 ... Sedimentation region, 6 ... Partition tube, 7 ... Water flow reversal and rise region,
8...Settlement pipe, 9...Through hole, 10...Discharge pipe.

Claims (1)

[Claims] 1 Inlet port 1 for treated water containing fine suspended solids
and a treatment tank 4 having an overflow port 2 for treated wastewater at its upper end and a discharge port 3 for suspended matter settled and separated from the water to be treated at its lower end; A partition tube that is installed vertically from the upper end to the lower end of the tank 4 and partitions the inside of the tank 4 into a settling region 5 of the water to be treated and a water flow reversal rising region 7 that communicates with the settling region 5 near the lower end. 6, which are vertically disposed substantially concentrically with a radial gap inside the partition tube 6, have an upper end connected to the introduction port 1, and have a lower end located above the lower end of the partition tube 6. The partitioning pipe 6 is provided with a settling pipe 8 which is opened on the side of the suspended matter discharge port 3 and has a large number of through holes 9 formed in the peripheral wall, and partitions the settling region 5 and the inversion rising region 7. The tank wall at the lower end of the processing tank 4, which faces the lower end via a narrow communication gap D, is inclined upward at a predetermined angle, and the suspended matter in the processing tank 4 is discharged. A wastewater treatment device characterized in that an outlet 3 is connected to a discharge pipe 10 whose height can be adjusted at a discharge end 10A.