JPH07116698A - Recovering device for precipitated sludge - Google Patents

Abstract

PURPOSE:To continuously treat waste water by recovering sludge precipitated on the bottom of a water tank at any time. CONSTITUTION:A recovering device 1 for precipitated sludge is equipped with a sludge scraper 2 and a pump 3 which is integrally fitted to the sludge scraper 2 and sucks sludge scraped thereby to the inside through a sludge suction hole 2A and discharges the sucked sludge. The sludge scraper 2 is so formed that it is moved adjacently to the base of a substitute precipitation tank A2 and also scraps precipitated sludge in the process of movement and sucks the sludge to the inside through the sludge suction hole 2A. The recovering device 1 is equipped with a delivery duct 4 which is connected to the pump 3 and sends the sucked sludge to a sludge return gutter 5, a traveling motor 9 for integrally moving the pump 3, the delivery duct 4 and the sludge scraper 2, a traveling rail 10 for detachably supporting the traveling motor 9, a pillar 11 and an arm part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recovery device for recovering settled sludge in a water tank into which water containing sludge after introducing factory wastewater or the like into an aeration tank and aeration is poured.

[0002]

2. Description of the Related Art Conventionally, when treating factory wastewater with activated sludge, a settling tank for pouring sludge-containing water after aeration in an aeration tank to precipitate sludge is supplied from the center with sludge-containing water. Generally, a circular tank of a central feeding type or a circumferential feeding type supplied from a circumferential portion is used. These sedimentation tanks are provided with dedicated sludge scraping devices and extraction devices, and are configured to operate these devices to extract the sedimented sludge from the bottom.
These settling tanks require periodic inspection every predetermined period, at which time the internal water is drained for inspection. And
If there is no preliminary settling tank at the time of this periodic inspection, sludge is settled in the alternative water tank.

[0003]

In the above-mentioned conventional settling tank, it is necessary to settle the sludge in the alternative water tank at the time of periodic inspection, etc., but the alternative water tank is provided with a sludge scraping device and a withdrawal device. Therefore, it is sometimes necessary to artificially collect the sludge that has settled, which inevitably results in intermittent operation, making it difficult to maintain the activity of activated sludge microorganisms and hindering stable activated sludge treatment. There is.

Therefore, in the present invention, when the alternative water tank is used as described above, the sludge settled at the bottom of the alternative water tank is
It is a technical issue to be solved to provide a settling sludge recovery device that can be recovered at any time.

[0005]

[Technical Means for Solving the Problems] The technical means for solving the above problems is to move a settling sludge recovery device in the vicinity of the bottom of a tank, and scrape the settling sludge in the tank in the moving process. , A sludge attracting body formed so that the sludge can be sucked into the sludge from the plurality of sludge suction holes, and the sludge attracted by the sludge attracting body is integrally attached to the sludge attracting body. A pump for sucking inside the sludge attracting body from the sludge suction hole and discharging the suction sludge, a delivery member connected to the pump for delivering the suction sludge to the outside of the water tank, the pump, and The present invention is configured to include a delivery member and a moving mechanism that integrally moves the sludge attracting body, and a moving mechanism support member that detachably supports the moving mechanism.

[0006]

According to the settled sludge recovering apparatus having the above structure, the moving mechanism removably supported by the moving mechanism supporting member is driven, and when the sludge attracting body is moved close to the bottom surface of the water tank, the bottom portion of the water tank is moved. The sludge that has settled on is sucked up, and the sludge is sucked into the inside from the sludge suction hole by the suction action of the pump, and is discharged to the outside of the water tank through the discharge member by the discharge action of the pump. Part of this sent-out sludge is sent to the aeration tank, and the other is sent to the centrifugal dehydrator or the like as excess sludge. Further, by removing the moving mechanism from the moving mechanism supporting member, the sludge attracting body, the pump, and the sending member can be carried out integrally to the outside of the water tank, so that maintenance and inspection of the sedimentation sludge recovery device is extremely easy and However, if there is a square tank with an appropriate capacity, it can be used as a precipitation tank.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the overall configuration of the wastewater treatment system, and FIG. 2 is a sectional view taken along the line aa in FIG. As shown in FIG. 1, according to this wastewater treatment system, wastewater in a factory or the like is once measured in the measuring tank A3 before being passed through the aeration tank A1. Aeration tank A
The wastewater passed through 1 is aerated by the supply air from a number of diffusers B. The wastewater aerated in the aeration tank A1 is pumped up from the aeration tank A1 by the two mud supply pumps C1 and C2 arranged in the aeration tank A1, and the alternative settling tank through the pipelines D1 and D2 and the mud gutter E. A2 is dropped.

The mud supply gutter E has a U-shaped cross section, and has mud supply ports EH having a diameter of, for example, 25 mm to 44 mm formed at predetermined intervals on the bottom surface. Waste water containing is dropped into the alternative settling tank A2.

Further, in order to prevent the sludge settled on the bottom surface of the alternative settling tank A2 from being diffused by the waste water dropped from the mud supply port EH of the mud supply gutter E, the buffer mud inside the mud supply gutter E is protected. -The BS is stretched vertically. Alternative settling tank A2
The sludge settling on the bottom surface of the sludge is scraped by the sludge scraping body 2 when the sludge scraping body 2 of the settled sludge collecting device 1 is moved by the driving of a traveling motor 9 described later. The sludge scraping body 2 is formed in a square pipe shape, and a plurality of sludge suction ports 2A having a diameter of, for example, 18 mm to 43 mm are opened on the sludge scraping surface, as shown in FIG. The sedimented sludge that has been scraped up can be sucked into the sludge scraping body 2 from each sludge suction port 2A.

A submersible sludge extraction pump 3 is mounted in the center of the sludge attracting body 2. The sludge extraction pump 3 sucks sludge into the sludge suction port 2A of the sludge attracting body 2 and discharges the sucked sludge, and the discharged sludge is sent through the delivery pipe line 4 to the sludge return gutter. 5
Sent to. The sludge return gutter 5 has a concave cross section and has a length that extends over substantially the entire length of the alternative settling tank A2. A return sludge pipeline 6 for returning the sludge to the weighing tank A3 and an excess sludge pipeline 7 for sending the excess sludge to a centrifugal dehydrator (not shown) are connected to the end portion thereof. ing. The return sludge conduit 6 is provided with a valve 6A for adjusting the flow rate, and the excess sludge conduit 7 is provided with a valve 7A for adjusting the flow rate.

As shown in FIG. 2, the sludge scraper 2, the submersible sludge extraction pump 3, and the delivery pipe 4 are provided with a support member 8.
It is attached to the traveling motor 9 of variable speed via.
The traveling motor 9 travels along a traveling rail 10 arranged above the alternative settling tank A2, and electric power is supplied to the traveling motor 9 to drive the traveling motor 9. When the vehicle is driven to travel along the traveling rail 10, the sludge attracting body 2, the submersible sludge extracting pump 3, the delivery pipe line 4, and the supporting member 8
Also moves in conjunction. The traveling rail 10 is attached to an arm 12 extending horizontally from each of a plurality of pillars 11 standing on the side of the alternative settling tank A2, and the sludge return gutter 5 is also attached to the arm 12. It is attached.

As shown in FIG. 1, the treated water withdrawal pump 13 provided in the alternative settling tank A2 is for pumping out relatively clean water after sludge has been settled. The water pumped out at 13 is filtered through sand through a pipe 14 and then sent to a decolorizing device (not shown) and discharged.

As described above, the settling sludge recovering apparatus 1 in the wastewater treatment system includes a sludge attracting body 2, an underwater sludge removing pump 3, a delivery pipe line 4, a sludge returning trough 5, a supporting member 8, a traveling motor. 9, traveling rail 10, a plurality of pillars 11,
And the arm portion 12. When electric power is supplied to the traveling motor 9 and the traveling motor 9 is driven along the traveling rail 10, the sludge attracting body 2 is moved along the bottom surface of the alternative settling tank A2. Therefore, the sludge settled on the bottom surface of the alternative settling tank A2 is scraped up. Further, since the sludge extraction pump 3 is also moved together with the sludge scraping body 2, the scraped sludge is sucked inside from each sludge suction port 2A by the suction action of this pump 3, and further through the delivery pipe line 4. And sent to the sludge return gutter 5. The suction sludge sent to the sludge return gutter 5 is returned to the measuring tank A3 via the return sludge pipeline 6, and the excess sludge is sent to the centrifugal dehydrator etc. via the excess sludge pipeline 7.

The settled sludge recovery device 1 for recovering sludge in this manner can be detached in a unit manner by removing the traveling motor 9 from the traveling rail 10 and can be easily attached. Therefore, maintenance and inspection of the settled sludge recovery device 1 is extremely easy. Further, by changing the moving speed of the traveling motor 9, the settling sludge recovery speed can be arbitrarily changed, so that the amount of sludge returned to the aeration tank A1 can be arbitrarily changed.

[0015]

As described above, according to the present invention, the moving mechanism detachably supported by the moving mechanism supporting member is driven,
When the sludge scraper is moved close to the bottom of the water tank, the sludge settling at the bottom of the water tank is scraped up, and the suction action of the pump causes the sludge to be sucked into the inside from the sludge suction hole. Since it can be delivered to the outside of the water tank via the delivery member by the discharging action, it is possible to collect the sludge that has settled on the bottom of the water tank at any time. This has the effect of enabling specific processing. Also,
Since the moving mechanism of the settling sludge recovery device is attachable to and detachable from the moving mechanism support member, it is possible to maintain the settling sludge collecting device without draining water from the water tank, and to improve maintainability. In addition, it can be used as a precipitation tank as long as it has a square tank with an appropriate capacity.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an embodiment of the present invention.

[Explanation of symbols]

 1 Settled sludge recovery device 2 Sludge scraper 2A Sludge suction port 3 Pump 4 Sending pipeline 5 Sludge return gutter 8 Support member 9 Running motor 10 Running level 11 Pillar 12 Arms A1 Aeration tank A2 Alternative sedimentation tank A3 Weighing tank

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshitaka Takemura 2-5-5 Minatomei, Minato-ku, Nagoya, Aichi Toho Gas Co., Ltd. Minatomei Factory

Claims (1)

[Claims] 1. A sludge scraper which is moved so as to be close to the bottom surface of the water tank and scrapes the sludge settled in the water tank in the moving process so that the sludge can be sucked into the sludge through a plurality of sludge suction holes. The body and the sludge scraper are integrally attached to the sludge scraper, and the sludge scraped by the sludge scraper is sucked into the sludge scraper through the sludge suction hole and then the sucked sludge is discharged. Pump, a delivery member connected to the pump for delivering the suctioned sludge to the outside of the water tank, a moving mechanism for integrally moving the pump, the delivery member, and the sludge attracting body, and its movement A settling sludge recovery device, comprising: a moving mechanism supporting member that detachably supports the mechanism.