JPH1157798A - Residue washing dehydrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve residue washing efficiency by installing an annular screen for separating residue from turbid water in a residue washing tank, installing a screw conveyor for scraping off the residue and conveying it coaxially with the annular screen, and compressing and dehydrating the conveyed residue in a compressing dehydration part. SOLUTION: When operating a residue washing dehydrator 10, a water supply valve of a washing water supply part 13 is opened to supply washing water to a residue washing tank 12 isolated by a washing water discharge chamber 16 and a water stop means 17 and water supply is continued until the washing water reaches a prescribed level L. Next, residue is fed into the residue washing tank 12 from a feeding port 11 and an agitator 14 is operated, and after the agitation and mixing of the residue proceeded to some extent, a driver 36 for a screw conveyor 32 is operated. After agitating washing, the agitator 14 is stopped and a drain valve B of a drainage system 15 is opened to drain out the washing water. At this time, the washed residue is caught on the inner peripheral surface of a screen 31 and the caught, washed residue is conveyed by the screw conveyor 32 and is dehydrated in a compressing dehydration part 33 and is carried out from a carry-out part 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage cleaning and dewatering apparatus for making sewage separated and removed from sewage generated from a sewage treatment plant sanitary and easy to handle. The present invention relates to an enhanced residue washing and dewatering apparatus.

[0002]

2. Description of the Related Art In a sewage treatment facility or the like, sewage is treated by a scum residue removing device, and sewage is discharged. This residue, as it is, contains a large amount of human feces and putrefactive organic substances, and has a high water content. Therefore, it is unsanitary and has poor handling when transporting. In addition, in landfills such as landfills, it causes odor and groundwater pollution. Therefore, it is very important to wash the residue discharged from the residue removing device in a sanitary manner to prevent environmental pollution, and to dehydrate the residue in order to improve the handleability of the residue.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to improve the washing efficiency of a residue washing and dewatering apparatus which enables the sediment separated and removed from wastewater to be handled hygienically and easily.

[0004]

SUMMARY OF THE INVENTION The present invention provides a sewage washing and dewatering apparatus according to the present invention, comprising: an inlet for feeding sewage; a washing water supply device for washing the sewage; and turbid water mixed with the sewage and washing water. A residue washing tank having a stirring device for stirring, an annular screen having an opening for introducing turbid water in the residue washing tank and separating the residue from the turbid water, disposed coaxially with the annular screen, A screw conveyor for scraping and transporting the sediment separated on the inner peripheral surface of the annular screen, a compression dewatering unit for compressing and dewatering the residue conveyed by the screw conveyor, and a discharge unit for discharging the compressed and dewatered residue. In a sewage washing and dewatering device comprising a screen type and a residue removing device having a screen, one end is fixed to the screen type and the residue removing device,
The other end is provided with water stopping means protruding from the water surface toward the upper part of the residue cleaning tank, and a washing water discharge chamber separated from the residue cleaning tank is formed by the water stopping means and a screen type residue removing device. The washing water discharge chamber is provided with a drainage means and an overflow weir.

[0005] It is preferable that the stirring device provided in the residue washing tank is a screw-type stirrer.

[0006]

1 and 2, a sewage washing and dewatering apparatus 10 according to an embodiment of the present invention is provided with a sewage washing tank 12 having an input port 11 for charging sewage and a screen type washing tank 12. It comprises a residue removing device 30 and a washing water discharge chamber 16 including a drainage device 15. The washing water discharge chamber 16 is separated from the residue washing tank 12 by the screen-type residue removing device 30, the water stopping means 17, and the like, as described later.

The bottom and side walls of the residue cleaning tank 12 are inclined as shown in FIGS. 1 and 2 in order to efficiently conduct turbid water in a screen type and to introduce the water into the residue removing apparatus 30.

[0008] The residue washing tank 12 has a washing water supply unit 13 for supplying the washing water for washing the residue to the residue washing tank 12. Part 13
The washing water supplied from the above is mixed in the residue washing tank 12 to become turbid water. Further, a screw type stirrer 14 for stirring the turbid water in the residue washing tank 12 to crush and wash the residue.
Is provided.

As shown in FIG. 3, the screw type agitator 14 basically comprises a drive unit 42, a speed reducer 43, and an agitating shaft 45, and is used to efficiently agitate the residue and the turbid water of the washing water. In this structure, the residue is not easily entangled with the stirring shaft 45. That is, the residue is very easily entangled with the rotating body (stirring shaft) of the stirrer. Further, once stuck, it grows and increases steadily, causing phenomena such as overload, vibration, and stirrer effect of the stirrer, which causes trouble. Therefore, as shown in FIG. 3, the screw type agitator 14 of the present invention has the following structural features.

(1) The shape of the blade of the stirring shaft 45 is of a screw type with little sticking.

(2) The width of the stirring blade is reduced (25 mm to 50 mm) in order to minimize protrusions in the underwater portion which cause entanglement of the residue, and the screw shape has a smooth curve at the end. .

(3) In order to maximize the stirring effect,
Further, in order to reduce sticking to the stirring shaft 45, the stirring shaft 45 is made thick (having a diameter of 100 mm to 200 mm, for example, a stainless steel pipe) so that the outer periphery of the blade is made large. By this improvement, the peripheral speed of the stirring blade is increased, so that the stirring effect can be sufficiently obtained.

By adopting the above structure, a stable operation with less sticking of the residue can be performed as compared with the conventional propeller type.

The screen-type residue removing apparatus 30 is shown in FIGS.
As shown in FIG. 5, wedge screen members are arranged so as to form a large number of linear gaps, and an opening 31
a fixed screen 31 formed with a
1. A screw conveyor 32, which is adjacent to the inner peripheral surface of the screen 31 and scrapes and transports the remaining washed and separated residue separated from the turbid water on the inner peripheral surface of the screen 31, and a screw conveyor 3
Compression dewatering unit 3 for compressing and dewatering the residue transported in 2
3 and an unloading section 34 that has been washed and dehydrated and unloads the residue to the outside.

In the case shown in the figure, an opening 31a is formed in a substantially cylindrical space formed by an arrangement of wedge screens.
Are formed by end faces on both sides in the axial direction of the cylindrical space and an upper rectangular surface connecting these end faces. The screw conveyor 32 is connected to the screen 31 from one of the end faces of the opening 13.
Is inside.

In the embodiment shown in FIG. 4, the screw conveyor 3
2, a screw 39 having a strong shaft is used, and a bearing 37 for supporting the shaft is provided. Therefore, the end face of the opening 31a on the bearing 37 side is closed.

The screw conveyor 32 of the embodiment shown in FIG. 5 employs a ribbon screw 38 without a shaft. By employing the ribbon screw 38, there is no need to provide a bearing for supporting the shaft.

Therefore, in the embodiment of FIG. 4, the turbid water enters the screen 31 from the upper rectangular surface, and in the embodiment of FIG. 5, the cleaning water flows from the other of the end surfaces and the upper rectangular surface. 31 and through the linear gap in the wedge screen. At this time, the residue remains on the inner peripheral surface of the screen 31.

The screw conveyor 32 may change the screw pitch to smooth the transfer of the residue. The compression dewatering unit 33 is provided at the end of the screw conveyor 32 as a part independent of the screw conveyor 32.

Note that the compression dewatering section 33 is provided at a level higher than the water level L in order to efficiently dehydrate the washed residue. Then, the sewage flowing out in the dehydration process of the compression dehydration unit 33 is returned to the cleaning water discharge chamber 16.

In the present invention, the residue washing tank 12 and the washing water discharge chamber 16 are separated by a stirring washing screen type residue removing device and a water stopping means, and the flow is made efficient by a guide plate. 6 shows the water stopping means 17, and FIGS.
5 is shown as an example. For these materials, stainless steel is preferable.

The water stopping means and the guide plate can be formed in any shape according to the shape of the residue cleaning tank 12. Various types of auxiliary members made of a hard material such as stainless steel can be added according to the shape of the tank. Further, a packing member may be appropriately used.

In the illustrated embodiment, the residue cleaning tank 12 and the cleaning water discharge chamber 16 are separated by a screen-type residue removing device 30 and a water stopping means 17. The water stopping means 17 is a screen type and is fixed to the residue removing device 30 and extends upward to above the water surface. Then, the guide plate 35 makes it easy to introduce substantially all of the residue washed and washed into the opening 31 a of the screen 31.

An overflow weir 18 is provided in the washing water discharge chamber 16. The overflow weir 18 has the following two functions and effects.

(1) It functions as a safety device in case of trouble such as clogging of the screen 31 and failure of the washing water supply unit 13.

(2) Since the residue cleaning water is continuously supplied as rinse water to the residue cleaning tank 12, it functions as a water level adjusting device for overflowing the residual water. In this case, there is an effect that the washing water continuously supplied to the residue washing tank as the rinsing water is discharged, and the water level of the entire residue washing tank 12 including the washing water discharge chamber is kept constant. This is because the washing water discharge chamber and the residue washing tank communicate with each other through the annular screen. The washing water can be continuously supplied as rinse water during the washing of the residue by stirring, so that it is possible to replace the wastewater containing pollutants etc. separated and removed from the residue by washing, and the cleaning effect is dramatically improved I do.

The position of the overflow weir 18 for discharging the spill water is in the washing water drainage chamber downstream of the annular screen. This can prevent the turbid water containing the residue from flowing out without passing through the annular screen.

The overflow weir 18 may be formed by connecting a pipe for discharging sewage to the washing water discharge chamber 16 as it is, in addition to the vertical plate as shown in the figure.

(3) Further considering the safety of the entire apparatus,
In addition to the overflow weir 18 for adjusting the water level, an overflow weir for emergency discharge may also be provided in the residue washing tank 12.

Further, as shown in FIG.
Sewage washing tank 12 and washing water discharge chamber 1
An opening may be provided in the water stopping means 17 at a position higher than the overflow weir for water level adjustment. In the illustrated embodiment, the opening 2
5 is provided.

Next, an example of one batch operation of the residue cleaning / dewatering apparatus 10 shown in FIG. 1 will be described.

(1) The discharge valve B of the drainage device 15 is closed.

(2) The water supply valve of the cleaning water supply unit 13 is opened to supply the cleaning water to the residue cleaning tank 12, and water is supplied until the cleaning water reaches a predetermined water level L. In addition, even after reaching the water level L, water supply is continued without closing the water supply valve.

(3) The residue is charged into the residue washing tank 12 through the inlet 11.

(4) The screw-type agitator 14 is operated for a predetermined time, and after the residue is agitated and washed to some extent, the driving device 36 of the screw conveyor 32 is operated. In addition,
Although water is constantly supplied to the residue cleaning tank 12, the surplus water passes through the screen 31 and overflows from the overflow weir 18 of the cleaning water discharge chamber 16, so that the water level L in both chambers is kept constant. It is.

(5) After stirring and washing for a predetermined time, the screw type stirrer 14 is stopped. Then, the drain valve B of the drain device 15 is opened. In the illustrated example, since the discharge valve B is provided in the cleaning water discharge chamber 16, the cleaning water in the residue cleaning tank 12 is
To be discharged, it must pass through a screen 31. At that time, the washed residue is reliably guided and captured on the inner peripheral surface of the screen 31.

(6) The washed residue captured by the screen 31 is conveyed by the screw conveyor 32, dehydrated by the compression dewatering unit 33, and discharged from the discharge unit 34.

(7) The water supply valve of the cleaning water supply unit 13 is closed,
The operation of the driving device 36 of the screw conveyor 32 is stopped. When the discharge from the drainage device 15 is completed, the drainage valve B of the drainage device 15 is closed.

This one-batch operation can be performed manually as necessary or regularly using a cycle timer or the like.

As an example of the embodiment, when 100 kg of sewage separated from sewage generated from a sewage treatment plant is treated by the sewage washing and dewatering apparatus shown in FIG.
^{3. The} processing time is 30 minutes, and the obtained residue is COD
The content was 5 g / kg (dry weight), the water content was 60% by weight, and the carry-out amount was 15 kg.

[0041]

According to the present invention, it is possible to provide a residue cleaning / dewatering apparatus which has a simple structure, has an extremely high cleaning effect on residue, is extremely compact, is inexpensive, and has a simple operation. it can.

Further, since the conventionally used screen-type residue removing device can be integrated and used for the residue washing / dewatering device, the added value of the conventionally used screen-type residue removing device can be enhanced. it can.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory sectional view showing one embodiment of a residue cleaning / dewatering apparatus of the present invention.

FIG. 2 is a plan view of the residue removing and dewatering apparatus of FIG. 1;

FIG. 3 is a side view showing an example of a screw type stirrer.

FIG. 4 is a partially cutaway schematic perspective view showing a screen-type residue removing device used in the residue cleaning / dewatering device of FIG. 1;

FIG. 5 is a partially cut-away schematic perspective view showing a screen-type residue removing device used in the residue cleaning and dewatering device of FIG. 1;

FIG. 6 is a schematic perspective view showing an example of a water stopping means used in the residue cleaning / dewatering apparatus of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 residue cleaning dewatering device 11 inlet 12 residue cleaning tank 16 cleaning water discharge chamber 13 cleaning water supply unit 14 screw type stirrer 15 drainage device 17 water stopping means 18 overflow weir 30 screen type residue removing device 31 screen 31a opening Unit 32 Screw Conveyor 33 Compression Dehydration Unit 34 Unloading Unit 35 Guide Plate 36 Screw Conveyor Drive 37 Bearing 38 Ribbon Screw 39 Shaft Screw 52 Hopper B Drain Valve L Water Level

Claims (2)

[Claims] 1. A sewage washing tank having an inlet for charging sewage, a supply device of washing water for washing the sewage, and a stirring device for stirring turbid water in which the sewage and the washing water are mixed; An annular screen for introducing turbid water in the residue washing tank and separating the residue from the turbid water; an annular screen, disposed coaxially with the annular screen, and separating the separated residue on the inner peripheral surface of the annular screen. A screen conveyor having a screw conveyor for scraping and conveying, a compression dewatering unit for compressing and dewatering the residue conveyed by the screw conveyor, and a screen-type debris removing device having a discharge unit for discharging the compressed and dewatered residue. In the dewatering device, one end is fixed to the screen and the residue removing device, and the other end is provided with water stopping means projecting from the water surface toward the upper part of the residue cleaning tank. By A washing water discharge chamber separated from a residue washing tank, wherein the washing water discharge chamber is provided with a drainage means and an overflow weir. 2. The sewage washing and dewatering apparatus according to claim 1, wherein the stirring device provided in the sewage washing tank is a screw-type agitator.