JP2011072942A - Waste water treating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste water treating apparatus capable of preventing the attachment of attached material to a trough wall surface. <P>SOLUTION: The waste water treating apparatus 1 includes: a tank body 2 for storing waste water; a scraping member 4 which is attached to a rotation member 3 rotating around the shaft line direction of the tank body 2 and scrapes scum floating on the surface of the waste water; and an annular trough 5 which is disposed along the outer circumferential surface of the tank body 2 and allows treated water separated from the scum to flow therethrough, wherein an overflow plate 6 which is disposed on the upper edge part of the trough 5 and is extended to the outside of the trough 5 and a scraper 7 which is attached to the rotation member 3 and is brought into contact with an overflow surface 6c of the overflow plate 6 are further disposed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wastewater treatment apparatus that removes floating substances floating on a drainage liquid surface stored in a wastewater treatment tank.

  In the wastewater treatment facility, a plurality of wastewater treatment tanks are provided. A treatment tank that performs primary treatment for decomposing organic substances by microorganisms, a sedimentation tank that performs secondary treatment for precipitating aggregated sludge and separating it from treated water by adding a flocculant, and aggregating sludge under pressure to treat water Further, in each waste water treatment tank such as a pressurized flotation tank that performs a tertiary treatment to be separated, waste water is treated step by step. In the tertiary treatment, the sludge floating on the treated water surface is scraped off and removed, while the treated water flows to the next process through a trough provided on the outer peripheral surface of the pressurized levitation tank (for example, Patent Document 1). And 2).

JP-A-6-328090 Japanese Patent Laid-Open No. 11-5094

  The treated water flowing through the trough overflows the upper end of the trough, falls on the wall surface as it is, and further flows to the next process. At this time, the dirt containing the flocculant adheres to the trough wall surface. When the deposit becomes large to a certain extent, it peels off from the trough wall surface and flows out along with the treated water, so the outflow of deposit may cause a malfunction of the wastewater monitoring instrument provided in the next process.

  Then, an object of this invention is to provide the waste water treatment apparatus which can prevent adhesion of the deposit | attachment to a trough wall surface.

  The wastewater treatment apparatus of the present invention is attached to a wastewater treatment tank (2) for storing wastewater, and a rotating member (3) swirling around the axial direction of the wastewater treatment tank, and floats floating on the drainage liquid surface A wastewater treatment apparatus (4) comprising a scraping member (4) for scraping off and an annular trough (5) provided along the outer peripheral surface of the wastewater treatment tank and through which the treated water separated from the suspended matter flows. 1) An overflow plate (6) provided on the upper end of the trough and projecting to the outside of the trough, and attached to the rotating member and in contact with the overflow surface (6c) of the overflow plate The above-described problem is solved by providing the contact member (7).

  According to the waste water treatment apparatus of the present invention, the treated water separated from the suspended matter flows through the trough. Since the treated water flows through the overflow plate when overflowing the trough, the treated water does not flow along the trough wall surface. A contact member attached to the rotating member comes into contact with the overflow plate to remove deposits. Since the contact member is attached to the rotating member, the overflow plate is periodically cleaned. Therefore, it can be removed before the deposit becomes large and peels off the overflow plate, and a large deposit that causes a malfunction of the drainage monitoring instrument does not flow out.

  In one form of the waste water treatment apparatus of the present invention, the overflow plate may be inclined downward toward the outside of the trough. According to this form, the treated water can be efficiently overflowed in the overflow plate shape without stagnation.

  In one form of the waste water treatment apparatus of the present invention, the waste water treatment tank may be a pressurized levitation tank. According to this embodiment, the trough wall surface can be obtained by providing the overflow plate in the overflow portion of the trough through which the separated treated water flows even in the pressurized floating tank that separates and removes floating substances floating in the drainage as scum. It is possible to prevent deposits from sticking to the surface. Since the overflow plate through which the treated water flows is cleaned by the contact member before the deposit becomes large, the large deposit does not flow out.

  In addition, in the above description, in order to make an understanding of this invention easy, the reference sign of the accompanying drawing was attached in parenthesis, but this invention is not limited to the form of illustration by it.

  As described above, in the wastewater treatment apparatus of the present invention, the treated water separated from the suspended matter flows through the trough. Since the treated water flows through the overflow plate when overflowing the trough, the treated water does not flow along the trough wall surface. A contact member attached to the rotating member comes into contact with the overflow plate to remove deposits. Since the contact member is attached to the rotating member, the overflow plate is periodically cleaned. Therefore, it can be removed before the deposit becomes large and peels off the overflow plate, and a large deposit that causes a malfunction of the drainage monitoring instrument does not flow out. Therefore, the conventional cleaning operation of the trough wall surface is not required, and the cleaning of the overflow plate itself is automated, thereby reducing the burden on the operator and avoiding the accident caused by the cleaning.

The top view of the waste water treatment equipment concerning one form of the present invention. Sectional drawing of an overflow plate. The figure explaining the relationship between an overflow plate and a scraper.

  FIG. 1 shows a top view of a wastewater treatment apparatus according to an embodiment of the present invention. The waste water treatment apparatus 1 is one of waste water treatment facilities for purifying waste water generated in a beverage manufacturing process such as a beer factory, and performs a tertiary treatment using a pressurized flotation tank. In the primary treatment, organic substances in the wastewater are decomposed by microorganisms and the like, and in the secondary treatment, sludge aggregated by the addition of a flocculant is precipitated and separated from the treated water. In the tertiary treatment, suspended substances in the wastewater after the secondary treatment are removed. For this reason, a flocculant is added to the waste water. Pressurized water in which air is dissolved by applying pressure to the wastewater is sent, and the air melted by decompression becomes fine bubbles and is released in the wastewater. ing. On the other hand, the precipitated suspended matter is scraped off and discharged by a rake blade provided at the bottom.

  The waste water treatment apparatus 1 is attached to the tank main body 2 as a waste water treatment tank for storing the waste water after the secondary treatment, the rotating member 3 rotating around the axial direction of the tank main body 2, and the waste water treatment apparatus 1. A scraping member 4 for scraping off the scum as a suspended matter floating on the liquid surface, a trough 5 provided along the outer peripheral surface of the tank body 2 and through which treated water separated from the scum flows, and an upper end portion of the trough 5 An overflow plate 6 provided and a scraper 7 as a contact member in contact with the overflow plate 5 are provided. The tank body 2 is a cylindrical water tank, and a passage 8 is bridged in the radial direction above the trough 5. In the tank body 2, fine bubbles adhere to the suspended matter in the stored wastewater and float up to separate from the treated water as scum. The tank body 2 is provided with a scum box 2a for collecting the scraped scum. The scum collected in the scum box 2a is sent to the next process. A rail 2 b for assisting the turning of the rotating member 3 is provided on the entire circumference of the upper end portion of the tank body 2.

  The rotating member 3 is provided in the upper part of the tank main body 2 and turns clockwise around a central axis 3 a provided in the center of the tank main body 2. The rotating member 3 includes a plurality of support portions 3b that extend from the central axis 3a in the radial direction to support the scraping member 4, and a fixing portion 3c that supports and fixes the support portions 3b. The support portions 3b are provided with a certain interval. In this embodiment, a total of six support portions 3b are provided every 60 degrees with the central axis 3a as the center. A wheel 3d that assists the turning of the rotating member 3 is provided at the tip of each support portion 3b and moves along the rail 2b of the tank body 2. A scraping member 4 is attached to each support portion 3b. The scraping member 4 is for scraping off the scum accumulated on the drainage liquid level, and swivels the drainage liquid level with the swiveling motion of the rotating member 3. Since the scum box 2a is provided on the turning path of the scraping member 4, the scum scraped by the scraping member 4 is collected when the scraping member 4 passes the scum box 2a. The tank body 2, the rotating member 3, and the scraping member 4 may use various known techniques.

  The trough 5 is provided in an annular shape along the outer peripheral surface of the tank body 2. The treated water separated from the scum in the tank body 2 flows through the trough 5, overflows from the upper end of the wall surface 5 a (see FIG. 2) on the outer peripheral side of the trough 5, and further flows to the next process. An overflow plate 6 is provided at the upper end of the trough 5. FIG. 2 shows a cross-sectional view of the overflow plate 6. The overflow plate 6 is an annular plate member provided over the entire circumference of the upper end portion of the trough 5. The overflow plate 6 has a fixing member 6 a provided over the entire circumference that is fixed from the inner peripheral surface side of the wall surface 5 a of the trough 5, and a support member 6 b that is supported from the outer peripheral surface side of the wall surface 5 a of the trough 5. . The support members 6b may be provided at regular intervals or over the entire circumference. The fixing method of the overflow plate 6 may be changed as appropriate. The overflow plate 6 is inclined downward toward the outside of the trough 5. Thereby, the treated water that overflows the trough 5 flows on the overflow surface 6 c of the overflow plate 6 and is discharged. The mounting angle of the overflow plate 6 may be in the horizontal direction or may be changed as appropriate. Further, the size of the overflow plate 6 in the radial direction may be appropriately changed. The scraper 7 is a plate-like scraping member made of an elastic material such as rubber, and the plate-like elastic member comes into contact with the overflow plate 6 and scrapes off the deposit on the overflow surface 6c like a spatula. . The scraper 7 is attached to the distal end portion of the support portion 3b of the rotating member 3 via an attachment member 7a, contacts the overflow surface 6c of the overflow plate 6, and rubs the overflow surface 6c. The scraper 7 does not need to be attached to all the support portions 3b and may be provided as appropriate. In this embodiment, a total of three scrapers 7 are provided for every other support portion 3b. You may change the attachment angle of the scraper 7 suitably.

  The operation of the waste water treatment apparatus 1 will be described. The waste water after the secondary treatment is stored in the tank body 2 and the suspended matter in the waste water is removed. In the tank body 2, a flocculant is added, and suspended substances in the wastewater are floated under pressure to be separated from the wastewater as scum. The scum is scraped off by the scraping member 4 rotating on the tank body 2 and collected in the scum box 2a. The waste water after the scum separation flows to the trough 5 as treated water. FIG. 3 is a view for explaining the relationship between the overflow plate 6 and the scraper 7. In FIG. 3, the rotating member 3 including the scraper 7 is pivoted clockwise. The treated water overflows from the trough 5 through the overflow plate 6 provided at the upper end of the wall surface 5a of the trough 5, and falls. At this time, since the treated water flows through the overflow surface 6c of the overflow plate 6 as shown by the arrow in the figure without passing through the wall surface 5a of the trough 5, it may fall along the outer peripheral side wall surface 5a of the trough 5. Absent. Then, as the rotating member 3 turns, the scraper 7 rubs the entire circumference of the overflow plate 6 while being in contact with the overflow surface 6c. Since the scraper 7 moves on the overflow surface 6c at a constant cycle, even if deposits may adhere to the overflow surface 6c, they can be removed before they become large. Since deposits do not adhere to the wall surface 5a of the trough 5, the cleaning operation of the wall surface 5a of the trough 5 that has been conventionally performed is not necessary.

  The present invention is not limited to the above-described form and can be implemented in various forms. For example, in the present embodiment, the number of installed support portions 3b is described as six, but the present invention is not limited to this, and appropriate changes can be made. Moreover, although the number of installation of the scrapers 7 has been described as three, the present invention is not limited to this, and may be changed as appropriate according to the adhesion state of the deposits on the overflow plate 6. The contact member is not limited to a plate-like member formed of an elastic material, and various brush members may be applied. Any known technique may be applied as long as the overflow surface 6c of the overflow plate 6 can be cleaned. Further, the shape of the overflow plate 6 is not limited to a plate shape. As long as the upper end portion of the trough 5 protrudes outward so that the treated water does not pass through the wall surface 5a of the trough 5, an appropriate change can be made. Although the pressure floating tank is described as the waste water treatment apparatus 1, the present invention is not limited to this, and an apparatus in which a scraping member 4 that scrapes off floating substances such as scum that floats is provided so as to swivel around the inner periphery of the tank body 2. If so, it is applicable.

1 Wastewater treatment equipment 2 Tank body (drainage treatment tank)
3 Rotating member 4 Scraping member 5 Trough 6 Overflow plate 6c Overflow surface 7 Scraper (contact member)

Claims (3)

A wastewater treatment tank for storing wastewater, a scraping member attached to a rotating member that rotates around the axial direction of the wastewater treatment tank, and scraping off floating substances floating on the drainage liquid surface, and an outer periphery of the wastewater treatment tank A wastewater treatment apparatus provided with a ring-shaped trough provided along a surface and through which treated water separated from the suspended matter flows,
An overflow plate provided at the upper end of the trough and projecting to the outside of the trough;
A contact member attached to the rotating member and in contact with the overflow surface of the overflow plate;
Wastewater treatment equipment equipped with.   The wastewater treatment apparatus according to claim 1, wherein the overflow plate is inclined downward toward the outside of the trough.   The wastewater treatment apparatus according to claim 1 or 2, wherein the wastewater treatment tank is a pressurized levitation tank.

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