KR200361461Y1 - Decanter for Discharging Supernatant - Google Patents

Abstract

The present invention relates to a discharge device for a continuous batch reactor for discharging a clear supernatant from the sewage treated by a continuous batch reactor for sewage treatment. The supernatant discharge device 1 according to the present invention, the inlet 12 is formed in which the supernatant flows from the reaction tank 2 and the collection pipe 11 and the collection pipe 11 disposed below a certain distance from the water surface A supernatant liquid collection device 10 including a discharge pipe 13 having a discharge valve 14 connected to and selectively opened and closed; An air supply device 20 selectively supplying air to the supernatant collecting device 10 to selectively block discharge of the supernatant from the supernatant collecting device 10; Floating member 30 for allowing the supernatant liquid collecting device 10 is suspended in the supernatant at a predetermined height; A support device 40 for supporting the supernatant collection device 10 to be movable up and down; It includes.

Description

Decanter for Discharging Supernatant

(Technology)

The present invention relates to a supernatant discharging apparatus, and more particularly, to a supernatant discharging apparatus mounted on an apparatus such as a continuous batch reactor and discharging a clear supernatant from treated sewage.

(Background)

Sequencing Batch Reactor is the first activated sludge system using inflow and discharge as a device to purify various sewage by repeatedly performing inflow, aeration and stirring, reaction, sedimentation and discharge in a single reactor.

Sewage treatment by a continuous batch reactor is not used in the early stages of development, but has been reactivated since the 80's due to the development of automated facilities.

Sequential batch sewage treatment is a type of advanced treatment with biological control that can simultaneously achieve the secondary and tertiary treatment objectives in one reactor, and by periodically utilizing bacterial activity in a given reactor, It is known to remove nitrogen and in addition to oily solids (sieve).

Bacterial activity in a continuous batch reactor is simply an anoxic condition which means that there is no free dissolved oxygen available except in the form of nitrates using a timer, anaerobic conditions in which free oxygen is not available even in nitrate form in sewage, nitrates It can be controlled by aerobic conditions that can use free dissolved oxygen in sewage regardless of the presence of.

Continuous batch reactors are constantly being investigated for all possibilities raised by all processes that can be controlled, including influent quality, mode of inlet, reaction time, and dominance of biological reactions.

In general, the continuous batch sewage treatment, the inflow step of sequentially introducing the sewage into the continuous batch reactor, the abandonment step to give up according to the treatment requirements, the reaction step to cause a biological reaction, separating the mixed liquid of the continuous batch reactor It proceeds to a process including a sedimentation step to discharge, the discharge step of discharging the clear supernatant of the upper, and the waiting step of discharging excess sludge generated in the reactor and waiting for the next inflow step.

One of the advantages of continuous batch sewage treatment is that the inflow mode allows control of the activity of bacteria as well as sedimentation. In other words, it is well known that activated sludge can be easily separated by simple gravity sedimentation by allowing a large number of bacteria to grow in a given reactor.

For example, the rapid introduction of new feeds into a continuous batch reactor allows for the observation of a very effective biological selection effect, which allows for the efficient separation of activated sludge and the supernatant in a very clean state.

Such a continuous batch reactor requires a supernatant discharge device for discharging the cleared supernatant of the upper layer out of the reactor after inflow, aeration and activated sludge settling.

However, up to now, the supernatant discharge device used in the continuous batch reactor is mainly mechanically operated in relation to the water level fluctuation, so the device is complicated and there are many problems in maintenance. In addition, there were some floating supernatant discharge device, but because the discharge device did not move vertically and vertically and the collection area was a swing type spaced apart from the discharge point, it was inconvenient to maintain and maintain the collection site failure or problem.

An object of the present invention is to provide a supernatant discharge device that is simple in structure and easy to maintain and which can prevent impurities from being mixed and discharged in the discharge of the supernatant.

It is an object of the present invention to provide a supernatant discharge device for a continuous batch reactor that can efficiently and economically discharge the clear supernatant treated by the continuous batch reactor.

1 is a side schematic view of an exemplary supernatant discharge device for a continuous batch reactor according to the present invention;

Figure 2 is a schematic plan view of the supernatant discharge device for an exemplary continuous batch reactor according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: supernatant discharge device according to the present invention 2: reactor

10: supernatant collecting device 11: collecting tube

12: inlet 13: discharge pipe

14: discharge valve 20: air supply device

21: air compressor 22: air supply pipe

23: solenoid valve 30: floating member

40: support device 41: support

42: guide 43: bracket

According to the present invention is provided in the reaction vessel is provided with a supernatant discharge device for discharging the supernatant cleared by the reactor.

The supernatant discharge device, the supernatant comprises an inlet port through which the supernatant flows from the reaction tank is formed and a discharge pipe having a collection pipe disposed below a certain distance from the water surface and a discharge valve connected to the collection pipe and selectively opened and closed. A collecting device; An air supply device selectively supplying air to the supernatant collecting device to selectively block the discharge of the supernatant from the supernatant collecting device; A floating member allowing the supernatant liquid collection device to float at a predetermined height in the supernatant; A support device for supporting the supernatant liquid collection device to be movable up and down; It includes.

Preferably, the support device includes a support vertically formed along the vertical movement path of the supernatant collecting device, a guide mounted on the support to guide the vertical movement of the supernatant collecting device, and a bracket for fixing the support to the reactor. do.

Preferably the reactor is a continuous batch reactor.

Hereinafter, with reference to the accompanying drawings will be described in detail the supernatant discharge device according to the present invention. The following embodiments are merely illustrative of the supernatant discharge device according to the present invention, and are not intended to limit the scope of the present invention.

1 is a side schematic view of an exemplary continuous batch reactor supernatant discharge device according to the present invention, Figure 2 is a schematic plan view of an exemplary continuous batch reactor supernatant discharge device according to the present invention.

As shown, the supernatant discharging device 1 according to the present invention comprises a reaction vessel 2, for example a continuous batch reactor 2, more specifically a side wall 2a downstream of the continuous batch reactor 2. A supernatant collecting device 10, an air supply device 20, a floating member 30, and a support, which are installed and discharged out of the continuous batch reaction tank 2, in which the clear supernatant is treated by the continuous batch reaction tank 2. Device 40.

The supernatant collecting device 10 is a device for collecting and discharging the supernatant treated by the continuous batch reactor 2, preferably having an inlet 12 through which the supernatant is introduced and extending horizontally below a certain distance from the water surface. An extended collection pipe 11 and a discharge pipe 13 connected to the collection pipe 11 perpendicularly to discharge the collected supernatant.

The collection pipe 11 is installed inside the reactor 2 and the discharge pipe 13 is connected to the collection pipe 11 and piped to the outside of the reaction tank 2, the portion of the portion located outside the reaction tank (2) The discharge valve 14 is provided in the discharge pipe 13. The discharge valve 14 is a valve that opens when discharge of the supernatant liquid starts and closes when discharge is stopped.

Therefore, the supernatant introduced into the inlet 12 of the collection pipe 11 located directly below the water surface flows through the discharge pipe 13 and is discharged from the reaction tank 2 according to the opening and closing of the discharge valve 14.

The air supply device 20 supplies air to the supernatant collecting device 10 in a discharge standby state in which the discharge of the supernatant does not proceed so that impurities such as the supernatant and solids or scum are introduced through the inlet 12. It acts to block things.

The air supply device 20 may be configured to include an air supply pipe 22 including an air compressor 21 and a solenoid valve 23.

In the state in which the discharge valve 14 is closed, the air supply device 20 supplies a predetermined amount of air to the collection pipe 11 to form a kind of air cushion in the collection pipe 11, thereby collecting the pipe 11. ) Is formed a separation wall to prevent the supernatant, as well as impurities to enter the inlet (12). The formation of the isolation wall by the air cushion is managed through the control of the solenoid valve 23.

When the supernatant is discharged for agitation and aeration in the continuous batch reactor 2, the air supply device 20 introduces air into the collection pipe 11 to prevent the supernatant from flowing into the supernatant collecting device 10. This stoppage will continue until the next discharge begins.

When the next discharge step is reached again, the solenoid valve 23 is opened for the first few seconds to exhaust the air in the collecting pipe 11, thereby bringing the collecting pipe 11 into a vacuum, and the vacuum state of the collecting pipe 11 is The supernatant is introduced into the collection tube 11, whereby the collection tube 11 is further submerged under the surface of the supernatant by its weight, and then the discharge valve 14 is opened to discharge the supernatant.

The supernatant level in the continuous batch reactor 2 changes according to the process of producing and discharging the supernatant. For example, when the supernatant is discharged, the level of the supernatant in the reactor 2 is lowered. It is necessary to keep the height of the collection pipe 11 at a constant position below the water surface of the supernatant against such a drop and rise of the supernatant level. To this end, the supernatant discharge device 1 according to the present invention is provided with a floating member 30 and the support device 40.

The floating member 30 provides a proper buoyancy to the supernatant collecting device 10 so that the collecting tube 11 maintains a constant height just below the surface of the supernatant so that the supernatant can always be discharged.

In the illustrated embodiment, the floating members 30 are mounted on the left and right sides of the collecting pipe 11 so that the supernatant liquid collecting device 10 is buoyant so that the collecting pipe 11 is kept just below the water surface.

As such, the collection pipe 11 is kept in a predetermined distance from the water surface not coincident with the water surface, so that floating impurities such as scum floating on the water surface of the supernatant are mixed into the inlet 12 during the discharge of the supernatant. It is to prevent that.

When the collection tube 11 reaches the minimum water level B of the reaction tank 2 by the continuous discharge of the supernatant, the discharge valve 14 is closed and air is supplied to the collection tube 11 by the air supply device 20. Discharge stops and waits until the next discharge stage.

The support device 40 supports the supernatant liquid collection device 10 and the floating member 30 so as to be movable upward and downward, and thus the supernatant liquid between the highest water level T and the lowest water level B in accordance with the change in the water level of the reaction tank 2. Collector 10 and the floating member 30 to be able to move freely up and down.

The support device 40 is not particularly limited as long as it supports the supernatant liquid collection device 10 and the floating member 30 to be movable up and down according to the change in the water level of the reaction tank 2, for example, the supernatant liquid collecting device ( A support 41 formed vertically long along the vertical movement path of 10), a guide 42 mounted on the support 41 to guide the vertical movement of the supernatant collecting device 10, and the support 41 It can be configured to include a bracket 43 for fixing to one wall (2a) of (2).

According to the supernatant discharge device 1 according to the present invention described above, the supernatant collected by the supernatant collecting device 10 is safely discharged without mixing impurities in the supernatant discharge order in conjunction with the air supply device 20, In addition, by the action of the floating member 30 and the support device 40, the collection pipe 11 of the supernatant collecting device 10 is the surface of the supernatant liquid irrespective of the level of the supernatant of the reaction tank (2) that changes depending on the generation and discharge of the supernatant It is always kept in the proper position below.

The supernatant discharge device 1 according to the present invention can be applied not only to the discharge of the supernatant from a continuous batch reactor, but also to other similar uses, for example, to be applied to the collection and discharge of the supernatant from the sludge storage tank.

The supernatant discharge device 1 according to the present invention described above can be installed and managed at a lower cost in application to a continuous ash reactor, etc., and the supernatant can be discharged without mixing impurities.

Claims (3)

In the supernatant discharge device is installed in the reaction tank (2) for discharging the supernatant cleared by the reaction tank (2), An inlet 12 through which the supernatant is introduced from the reactor 2 is formed, and a discharge valve 14 connected to the collection pipe 11 and the collection pipe 11 disposed below a predetermined distance from the water surface and selectively opened and closed. Supernatant collection device 10 including a discharge pipe 13 is provided; An air supply device 20 selectively supplying air to the supernatant collecting device 10 to selectively block discharge of the supernatant from the supernatant collecting device 10; Floating member 30 for allowing the supernatant liquid collecting device 10 is suspended in the supernatant at a predetermined height; A support device 40 for supporting the supernatant collection device 10 to be movable up and down; Supernatant discharge device comprising a. According to claim 1, The support device 40 is mounted on the support 41, the support 41 formed vertically long along the vertical movement path of the supernatant liquid collecting device 10, the supernatant liquid collecting device 10 The supernatant discharge device, characterized in that it comprises a guide (42) for guiding the vertical movement of the bracket (43) for fixing the support (41) to the reactor (2). The supernatant discharge apparatus according to claim 1 or 2, wherein the reactor (2) is a continuous batch reactor.