JP2001321614A - Screen type solid-liquid separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen type solid-liquid separator which can be miniaturized and in which washing water to be supplied from the outside is not necessary and the clogging of a screen can be prevented by using a biological membrane. SOLUTION: In this screen type solid-liquid separator, a liquid portion of human waste to be treated is filtrated by making the human waste pass through a rotating drum screen 2 and then the human waste after filtrated is separated into a solid portion and a liquid portion by supplying it furthermore to a screw dehydrator 7. The dehydrator 7 is disposed in the screen 2 and the human waste after filtrated is fed to a human waste throwing-in chute 701 of the dehydrator 7 in the screen 2 by using a blade for scraping up the human waste. Washing water jetting means 9a, 9b, 12 are additionally installed for washing the screen 2 and the filtrate of the screen 2 is used as the washing water. An ozonizer 13 is additionally installed for injecting ozone for sterilizing and deodorizing the screen 2 into the inside of the screen 2 if necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid separation device used in a sewage treatment plant and the like, and more particularly, to a solid-liquid separation device in which a sewage to be treated (sewage water mixed with a solid content and a liquid content) is provided inside a drum screen which rotates. The present invention relates to a screen-type solid-liquid separation apparatus in which a liquid component is filtered by passing the solution through, and the residue after the filtration is further passed through a dehydrator to be separated into a solid component and a liquid component.

[0002]

2. Description of the Related Art A screen-type solid-liquid separation apparatus is one in which a drum screen and a dehydrator are combined into one unit. 3 and 4 show the structure of a conventional screen-type solid-liquid separation device. FIG. 3 is a schematic vertical sectional view showing the entire structure of a conventional screen-type solid-liquid separator, and FIG.
4 is a schematic enlarged sectional view of a drum screen, and FIG. 4B is a schematic sectional view taken along line CC in FIG. 4A.

A conventional screen-type solid-liquid separator is shown in FIG.
As shown in FIG. 4, a drum screen 2 rotated by a driving mechanism such as a motor 1 and a sediment inflow pipe 3 for feeding the sediment into the drum screen 2.
A trough 4 attached to the tip of the residue inflow pipe 3, a filtrate collection chute 5 for collecting a liquid (filtrate) filtered by the drum screen 2, a drain pipe 6 for discharging the collected filtrate to the outside, and a drum screen 2. A screw dehydrator 7 for further dewatering the residue after the liquid has been filtered by the filter, a residue container box 8 for storing the residue after dehydration, and washing the inner and outer surfaces of the drum screen 2 by washing. It is composed of washing water injection pipes 9a and 9b for preventing clogging. 1
Reference numeral 0 denotes a case for accommodating a screen-type solid-liquid separation device, which has a strong structure for holding the contents and a hermetically sealed structure that does not leak odors or the like to the outside.

[0004] The drum screen 2 is shown in FIGS.
As shown in detail, a metal wire with a triangular cross section 2
01 is arranged in a circle along the axis of the drum at intervals of about 0.5 to 2.0 mm to form a cylinder.
The liquid content in the residue is filtered by the minute gap formed between the adjacent metal filaments 201.

On the inner wall surface of the drum screen 2, a large number of fin-shaped scum transfer blades 202 are provided upright at a desired inclination angle. Screw type dewatering machine 7 by the blade 202
I send it out to the side. Further, a filtrate collecting chute 5 is provided at a lower side of the drum screen 2.
The filtrate filtered by the drum screen 2 by the filtrate collecting chute 5 is collected and discharged to the outside through the drain pipe 6.

The screw type dehydrator 7 is installed at a position below the opening end of the drum screen 2. While being conveyed by a screw 703 that is driven to rotate by a motor 702, while being dewatered. The dewatered sewage is dropped and stored in a sewage storage box 8, and the dehydrated liquid is passed through a drain pipe (not shown). It is discharged outside.

The washing water injection pipes 9a and 9b supply washing water sent from the outside to the drum screen 2 through the nozzle 901.
At high pressure to wash the inner and outer surfaces of the drum screen 2 to prevent clogging.

[0008]

By the way, in the above-mentioned conventional screen-type solid-liquid separator, the screw-type dehydrator 7 is installed at a position below the opening end of the drum screen 2. Therefore, a sufficient space in the height direction is required to install the screen-type solid-liquid separation device, and there is a problem that the height of the entire device is increased and the size is increased accordingly.

Further, in the conventional screen type solid-liquid separation apparatus, it is necessary to separately prepare washing water jetted from the washing water jet pipes 9a and 9b. A slimy biofilm is generated on the outer surface by microorganisms, and the biofilm may cause clogging of the screen surface.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can reduce the size of the apparatus, eliminate the need for external supply of washing water, and prevent screen clogging due to biofilm. It is an object of the present invention to provide a screen-type solid-liquid separation device that can be used.

[0011]

The inside of a drum screen used in a screen-type solid-liquid separator is hollow, and the diameter of the drum is generally smaller than that of a dehydrator installed behind the drum screen. large. The present invention
It was made by paying attention to this.

That is, the screen-type solid-liquid separation device according to the first aspect filters the liquid by passing the residue to be treated through a rotating drum screen, and further dewaters the filtered residue. In a screen-type solid-liquid separation device that separates a solid content and a liquid content by passing through a machine, the dehydrator is disposed inside a drum screen, and the residue after the liquid content is filtered is placed in the drum screen. It is designed to be sent to the residue input chute of the dehydrator.

[0013] The screen-type solid-liquid separation device according to claim 2 is provided with washing water jetting means for jetting washing water for clogging prevention toward the drum screen, and the washing water used in the washing water jetting means. Uses the filtrate filtered by the drum screen.

According to a third aspect of the present invention, there is provided the screen-type solid-liquid separation device according to the first or second aspect, further comprising an ozone generator, wherein the ozone generator is provided in the drum screen as necessary. Is injected.

Further, the screen-type solid-liquid separation device according to claim 4 is the screen-type solid-liquid separation device according to claim 1, 2 or 3, wherein a screw-type dehydrator is used as the dehydrator and the screw-type dehydrator is used. A blade for scraping the residue is fixed to the inner wall surface of the drum screen facing the chute for throwing the residue of the type dehydrator, and the residue after the liquid component is filtered is used by the blade to feed the residue of the screw type dehydrator. The chute is scooped up to a position above the chute, and the scooped sediment falls naturally into the chute for throwing the sediment by its own weight.

In the above configuration, since the dehydrator is disposed in the drum screen, the height of the device can be reduced by the size of the dehydrator, and the size of the device can be reduced. Further, since the filtrate after being filtered by the drum screen is reused as washing water, it is not necessary to separately prepare washing water as in the related art. Furthermore, since ozone can be injected into the inside of the drum screen, a biofilm generated on the surface of the drum screen can be effectively sterilized and removed, and the deodorizing effect can be exhibited.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show one embodiment of a screen-type solid-liquid separation device according to the present invention. FIG. 1 is a schematic vertical sectional view showing the entire structure of a screen-type solid-liquid separation device according to an embodiment, FIG. 2 (a) is a schematic enlarged sectional view of a drum screen, and FIG. 2 (b) is FIG. FIG. 2C is a schematic cross-sectional view taken along the line AA in FIG.
It is sectional drawing which shows the -B line schematic. The same parts as those of the above-mentioned conventional screen-type solid-liquid separation device (FIGS. 3 and 4) are denoted by the same reference numerals, and detailed description thereof will be omitted.

The screen-type solid-liquid separator according to the illustrated embodiment has a unit configuration similar to that of the conventional screen-type solid-liquid separator, and is conventionally located below the opening end of the drum screen 2 as shown in FIG. The screw-type dewatering machine 7 installed as described above is installed in the drum of the drum screen 2 as shown in FIG.

However, if the screw type dehydrator 7 is simply arranged inside the drum screen 2,
It is impossible to put the residue after the liquid component is filtered into the residue charging chute 701 of the screw type dehydrator 7. Therefore, in this embodiment, the fins on the inner wall surface of the drum screen 2 facing the residue chute 701 for filtering the liquid component and putting the residue into the residue chute 701. A number of blades 203 for scraping and removing the residue were erected.

The residue scraping blade 203 has a blade direction substantially parallel to the axial direction of the drum. The liquid sent from the residue transfer blade 202 is filtered to remove the liquid. The residue is lifted up to a position above the residue charging chute 701 and falls into the residue charging chute 701 by its own weight near the position above the residue charging chute 7.

The blade 203 for scraping the residue is
The residue after the liquid component has been filtered is removed and the residue chute 701 is placed.
2 (c) because it is necessary to lift the
As shown in (2), it is desirable to incline slightly forward in the rotation direction so that solids do not slide off the blade before reaching the upper position of the residue input chute 701.

In the screen type solid-liquid separation device of the present invention, a filtrate recovery tank 11 is provided at a lower position of the drum screen 2 in order to use the filtrate filtered by the drum screen 2 as washing water for the drum screen 2. The filtrate discharged from the drum screen 2 is collected and stored in the filtrate recovery tank 11, and the filtrate collected in the liquid recovery tank 11 is sent by the pump 12 to the washing water injection pipes 9a and 9b.
The nozzle 901 is sprayed at a high pressure toward the drum screen 2.

Further, an ozone generator 13 is additionally provided, and the ozone outlet 13a is made to face the inside of the drum screen 2, and if necessary, ozone is injected into the drum screen 2 so that the ozone generator 13 is provided on the inner and outer surfaces of the drum screen. The generated biofilm is sterilized and removed to prevent screen clogging.

A liquid component is discharged from the screw type dehydrator 7 by dehydration. It is desirable that this discharged liquid component is also sent to the filtrate recovery tank 11 through a drain pipe (not shown) and reused as washing water. It is desirable that a drain valve 14 and a drain pipe 15 be provided in the filtrate recovery tank 11 so that the stored water can be drained as needed.

The screen-type solid-liquid separation device according to the above embodiment performs solid-liquid separation of the residue in the following manner. That is, when the sewage to be treated is started to be supplied into the rotating drum screen 2 through the sewage inflow pipe 3, the sewage is sent by the sewage transfer blade 202 toward the sewage scraping blade 203 side. During this time, the liquid is filtered. The filtered liquid is supplied to the drum screen 2
Are collected and stored in a filtrate collection tank 11 arranged below the slag.

When the residue after the liquid component has been filtered is sent to the position of the blade 203 for scraping the residue, the blade 203 for scraping the residue, as shown in FIG. While being lifted and placed on the blade, the drum rotates together with the drum screen 2 and is carried upward.

When the blade 203 for scraping the residue on which the residue is placed reaches the position above the residue chute 701 of the screw type dehydrator 7, the residue placed on the blade is removed by its own weight. It falls toward the residue input chute 701 and is input to the screw type dehydrator 7. The residue put into the screw type dewatering machine 7 is further condensed while being compressed and conveyed by a screw 703 rotated and driven by a motor 702, and the residue after dehydration is dropped and stored in a residue storage box 8. Is done.

As described above, in the case of the screen-type solid-liquid separator according to the embodiment, since the screw-type dehydrator 7 is disposed in the drum screen 2, compared with the conventional screen-type solid-liquid separator. The height of the apparatus can be reduced by the height of the screw type dehydrator 7 placed in the drum screen 2. As a result, the size of the device can be reduced.

Further, this type of screen type solid-liquid separator is provided with a case 10 for environmental protection and prevention of off-flavor generation.
Although it is generally installed in the inside, etc., in the case of the conventional screen-type solid-liquid separation device, as described above, the height of the device is high, and depending on the entrance structure of the case 10, the device is assembled in a completed state. In some cases, it was not possible to carry the device, and it was necessary to take the construction work such as disassembling the device once, reassembling the device, and reassembling the device in the case. However, in the case of the screen type solid-liquid separation device of the present invention, such a problem can be solved because the size of the device can be reduced.

The filtrate discharged from the drum screen 2 is stored in a liquid recovery tank 11, and this filtrate is used as washing water, and is blown from the nozzle 901 of the washing water injection pipes 9a and 9b to the drum screen 2 at high pressure. Since it is attached, it is not necessary to separately prepare washing water as in the conventional screen type solid-liquid separation device, and the device can be constructed as a so-called closed system.

In the case of a conventional screen-type solid-liquid separator,
Normally, the treated water from the sewage treatment plant is used as the cleaning liquid, so it is necessary to pipe the treated water from the sewage treatment plant that is far away from the screen to the screen-type solid-liquid separation device, and to send it.
Although a large-sized pressure pump and a long-distance water supply pipe are required, the present invention eliminates such a need, and can reduce the cost of the entire system.

It should be noted that, as in the present invention, the drum screen 2
When the filtrate discharged from the washing water is used as the washing water, the ratio of the pollutants contained is higher than the conventionally used treated water, and in some cases, the nozzle may be clogged. As 9b, it is desirable to use a self-cleaning nozzle having a large diameter.

Further, as described above, conventionally, when the operation period of the apparatus is prolonged, a slimy biofilm is generated on the inner and outer surfaces of the drum screen 2 by microorganisms, and this biofilm may cause clogging of the screen surface. However, according to the present invention, since the ozone generator 13 is provided and ozone is injected into the drum screen 2 as necessary, the organisms attached to the drum screen 2 by the strong oxidizing power of ozone are provided. The membrane can be sterilized, the propagation of biofilm can be suppressed, and the clogging of the screen can be prevented.

In addition, as a method for preventing the generation of a biofilm, a method of peeling the biofilm with washing water, a method of applying a chemical or the like so as not to propagate microorganisms, and the like can be considered. The method using ozone adopted is the simplest and most effective. In addition, since ozone has a deodorizing effect, odor generated in the drum screen 2 can be suppressed, and generation of an unusual odor can be prevented. According to the experiment of the inventor, it was confirmed that both the prevention of biofilm adhesion and the deodorization effect can be obtained only by using a low-concentration ozone generator and injecting ozone for about 10 minutes after the operation of the apparatus is stopped. Was done.

[0035]

As described above, according to the present invention, the dehydrator is disposed in the drum screen, and the residue after filtering the liquid is sent to the dehydrator in the drum screen. The height of the device can be reduced accordingly, and the size of the device can be reduced.

Further, since the filtrate filtered by the drum screen is reused as washing water for the drum screen, it is not necessary to separately prepare washing water as in the related art, and the cost of the apparatus can be reduced.

Further, an ozone generator is provided so that ozone can be injected into the drum screen.
The biofilm generated on the surface of the drum screen can be effectively sterilized and removed, and the deodorizing effect can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a screen-type solid-liquid separation device according to the present invention.

FIGS. 2A and 2B show the structure of a drum screen in FIG. 1, wherein FIG. 2A is a schematic enlarged sectional view, and FIG.
FIG. 2C is a schematic cross-sectional view taken along line A, and FIG.

FIG. 3 is a schematic vertical sectional view of a conventional screen-type solid-liquid separation device.

4A and 4B show the structure of the drum screen in FIG. 3, wherein FIG. 4A is a schematic enlarged sectional view, and FIG.
It is a sectional view taken on the line C.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 motor 2 drum screen 3 sewage inflow pipe 4 trough 7 screw dehydrator 8 sewage storage box 9a, 9b washing water injection pipe 10 case 11 sewage collection tank 12 pump 13 ozone generator 13a ozone outlet 14 drain valve 15 Drain pipe 201 Metal wire 202 Slag transfer blade 203 Slag scraping blade 701 Slag input chute 702 Motor 703 Screw 901 Nozzle

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinya Ando 12-3, Okari, Sowa-cho, Sarushima-gun, Ibaraki Pref. BB22 BB31 BB34 FA01 FA02

Claims (4)

[Claims] 1. A liquid content is filtered by passing a residue to be treated through a rotating drum screen, and then the filtered residue is further passed through a dehydrator to be separated into a solid content and a liquid content. In the screen-type solid-liquid separation device, the dewatering machine is disposed inside the drum screen, and the residue after the liquid component is filtered is sent to the residue input chute of the dehydrator in the drum screen. A screen-type solid-liquid separation device characterized by the following. 2. The screen-type solid-liquid separation device according to claim 1, further comprising washing water jetting means for jetting washing water for clogging prevention toward the drum screen, and washing used by the washing water jetting means. A screen-type solid-liquid separator, wherein the filtrate filtered through the drum screen is used as water. 3. The screen-type solid-liquid separation device according to claim 1, further comprising an ozone generator, wherein ozone is injected into the drum screen as needed. Liquid separation device. 4. The screen-type solid-liquid separation device according to claim 1, 2 or 3, wherein a screw-type dehydrator is used as the dehydrator, and a drum screen facing a residue input chute of the screw-type dehydrator. A blade for scraping the residue is fixed on the inner wall surface, and the residue after the liquid component has been filtered is scraped by the blade to a position above the residue chute for loading the residue of the screw type dehydrator, and the blade is scraped. A screen-type solid-liquid separation device wherein the residue is allowed to fall naturally into the residue charging chute by its own weight.