JPS5864192A - Aerating cell - Google Patents

Abstract

PURPOSE:To enlarge effective capacity for reserving liquid and to enhance the defoaming, effect by providing a defoaming chamber equipped with a defoaming means having a surface area smaller than the floor space of an aerating cell opened to the aerating cell above the ceiling wall of the aerating cell having closed structure. CONSTITUTION:When liquid to be treated is fed through a liquid-feed pipe 36 into an aerating cell 1, it enters into the cell until it comes in contact with the ceiling wall 4 of the aerating cell 1. The feed of the liquid is suspended by the operation of a float switch 37 so that the surface area of the horizontal part of a defoaming chamber 5 constitutes the surface area of the liquid. Aerating air is let flow through a muffler 24 and a space between the outer cylinder 19 of a defoaming means 18 and a motor 21 by the operation of an aerating means 7, entangled in the liquid fed into the main body 12 of a nozzle by a pump 9, changed into dynamic water head by a diffuser 13 and then dispersed into the liquid to be treated in the aerating cell 1 to aerate the liquid to be treated. According to this method, the effective capacity of the aerating cell is enlarged, while the defoaming means can be made small.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a closed type aeration tank, and particularly relates to an aeration tank suitable for treating excrement.

Conventionally, an aeration system was installed in the pit for excrement treatment, and oxygen from the air was blown into the excrement to purify the excrement. A space is left between the upper lid and the surface of the liquid to be treated.In this way, the surface area of the liquid to be treated is the same as the horizontal cross-sectional area of the aeration tank.Therefore, the space above the aeration tank can be effectively accommodated. The amount of liquid to be treated is quite small compared to the internal volume of the aeration tank even when the tank is full.

If you force the liquid to be treated, it will overflow outside the aeration tank.

By the way, conventionally, when sewage with a high concentration, such as sewage consisting only of excrement from a cowshed or pig farm, or human waste, is treated using an aeration device, the air introduced becomes llI bubbles that float to the surface, causing bubbles to form on the sewage M. A layer forms and gradually increases, filling the upper space if the sewage treatment tank is a closed type, and if the sewage treatment tank is left alone, bubbles overflow to the ground.
Even if maintenance and inspection are good, the result may be unfavorable.

Bubbles make it impossible to inspect the sewage treatment tank, and removing the bubbles is not easy. For this reason, a defoaming device is provided, but since the liquid surface area is large, it is difficult to defoam while leaving an appropriate amount of foam on the liquid surface. Furthermore, since the surface area of the liquid is large, when defoaming is performed, the gas inside the high-temperature flowing liquid quickly escapes into the upper space, resulting in a strong odor.

An object of the present invention is to provide an aeration tank that can increase the effective storage volume for sewage treatment and is easy to defoamer. The defoaming chamber is also provided with a defoaming chamber that opens upward into the aeration tank, and a defoaming means is provided within the defoaming chamber.

Hereinafter, embodiments of the present invention will be described. FIG. 91 is a longitudinal sectional view, and FIG. 1 is a plan view of FIG. 1. The aeration tank L is shaped like a rectangular container in plan view, and is provided with a tank bottom A, an ascending circumferential wall 3 around the tank bottom A, and a ceiling wall D on station IIJ. A defoaming chamber j is provided which opens upward into the aeration tank l and has an area smaller than the floor area of the aeration tank. The base is a lid that opens and closes the opening in the ceiling wall, and is used for entering and exiting the aeration system installed at the bottom of the tank for maintenance.

The aeration system is equipped with a motor t and a pump driven by the motor l.
The diffuser/J is connected in a straight line to the nozzle body/J which is connected to the tip of the nozzle and contains nine nozzles, and the air chamber for introducing air opens in the air chamber near the opening of the nozzle in the nozzle body/J. Introductory pipe/straight pipe/j is connected 9, straight pipe l! is inserted through a hole in the ceiling of the defoamer Iij and connected to the lower part of the outside @/9 of the defoamer /l by a bend 14 and a short pipe lde, and opens into the outer cylinder 19. Defoaming machine/1 is defoaming 1! ! ! The gap through which the introduced air passes into the sealed outer cylinder/1 fixed to the base J fixed above is the outer cylinder 19.
and a cage J/ is fixed to the pace J-,
The motor shaft of the motor passes through a hole in the base JJ and protrudes into the defoaming chamber I, and a foam cutter 3 is provided with blades at the tip.
is fixed. There is a defoaming chamber on the upper end of the outer cylinder/f! A silencer Koda, which opens inward and communicates with the atmosphere, is installed.

A discharge pipe Jj is connected to the discharge port /l of the pump t in a branched manner. The discharge pipe-j rises from the pump at the straight pipe J base,
Bend at the pen door and connect the bend and pentcots to the short pipe Jt and offset, bend J? Straight pipe J/
Connect the straight pipes, and insert the straight pipe 7/ through the hole in the ceiling of the sound-muffling room I to create the sound-muffling room! It is connected to bend JJ outside, short pipe J3 is connected to bend 3, and an on-off valve Jda is attached to short pipe JJ, and it is piped to the paddle in the next process or is spread as compost. A pipe joint for connection to the tank car is attached to SO.

A liquid sending pipe J6 passes through the ceiling wall of the aeration tank, which is sealed between the ceiling wall and the ceiling wall, and opens into the tank. J and Jt are float switches, and the float switch J issues a signal for the aeration tank l to be filled with water, and stops the pump that sends the liquid to be treated from the liquid feed pipe J1, either manually or automatically via a control device. and the float switch at is the aeration WIl
is installed at the lowest water level position of the aeration tank l, and when the lowest water level of the aeration tank l is lowered and operated in the decreasing direction, it issues a signal and either stops the submersible motor bong 10 manually or via a control device, or closes the on-off valve J41. It drives the pump connected to the liquid sending pipe J4.

When liquid M is fed into the aeration tank configured as above through the liquid feed pipe J4, it flows until it reaches the ceiling 11 of the aeration tank L, and then the float switch J is operated and the liquid is fed until the sand is fed. Therefore, the area of the horizontal portion of the defoaming chamber I becomes the attenuation area. When the aeration equipment is operated, the air for aeration passes through the muffler 1, the sound is muffled, and the air is sucked in. It passes through the outer cylinder 9 of the defoamer 1 and the cage-tacho 1 connection, and is then turned on to the motor 1. is cooled, and sand is passed through the air introduction pipe/II, and the nozzle body/J
Inside, the air is sent to the pump, and the scissors air is drawn into the liquid and converted into a velocity head by the diffuser/J, which is then dispersed into the liquid to be treated in the aeration tank L, and the liquid to be treated is aerated. .

At this time, if the liquid to be treated is highly concentrated cow or pig excrement, or a storage area, the air rising in the liquid will not disappear into bubbles on the top surface of the liquid to be treated, but will increase on top of the liquid to be treated. It becomes a foam layer. These bubbles are treated in a defoaming chamber because the liquid to be treated reaches the ceiling wall! The liquid comes out on top.

Therefore, when the foam cutters J and 7 are rotated by the drive of the motor 11 of the defoamer/I, the bubbles in the defoamer 'Nj are only those that tend to rise above the foam cutter JJ due to the characteristics of the foam cutter. This will cause the bubbles to disappear and leave bubbles on the liquid surface.

When the aeration tank l is a rotten treatment tank, the liquid to be treated that has been composted after completion of rot can be transferred to a tank car for spraying by opening the on-off valve J#, or transferred to a secondary storage tank. do.

FIG. 3 is a longitudinal sectional view of another embodiment of the invention. Only the parts that are different from the first embodiment will be described. submersible motor pump io
The air introduction pipe l# rising from the nozzle body lco connected to is a straight pipe lj#? - Bend in the aeration tank/4, short pipe/ri,
The pipes 41/ and 41/ are connected in sequence, and the short pipe 41/ is connected to the bend J9 so as to stand upright in the center of the defoaming chamber 3, and the short pipe 41/
is connected to the funnel-shaped defoamer section and opens at the center of the funnel-shaped bottom of the defoamer 41. The upper end surface of the defoaming device dowel is set at a height at which foam is to be removed in the defoaming chamber I.

The remaining air passes through the defoaming valve S 1 and is sucked into the nozzle body 1 from the air introduction pipe 1. Therefore, the bubbles on the defoaming device 1 in the defoaming device I are sucked together. The outside air is supplied to the gap 41. where the discharge pipe S passes through the hole in the ceiling of the defoaming chamber j.
Replaced through 7. If the ceiling of the defoamer 113 is wide open, new air can be sucked in for air introduction.

Figure D is a longitudinal sectional view of still another embodiment of the present invention. Only the differences from the first embodiment will be described. A straight pipe 11 rising from the nozzle body 1 of the aeration device passes through the ceiling of the defoaming chamber I, has a muffler attached to its end, and is connected to the atmosphere through the muffler.

At the position where the straight pipe 3/ of the discharge pipe 1j passes through the silencing chamber j and comes out, a T-joint lI-tei is connected in place of the pen doco of the first embodiment, and a part of the branch of the T-joint 411 is connected to the first As in the example, short pipe JJ, on-off valve J-tei, piping J! sequentially concatenate T
An on-off valve aZ that can adjust the flow rate is connected to the other branch of the joint, and on-off valve #3 is connected to a short pipe #1 and an elbow 7 straight pipe a.
g are connected, and the straight pipe 4It closes an opening provided in the ceiling wall of the defoaming chamber j, passes through a hole in the lid j/, and exits into the defoaming chamber 3 with its tip tζ equipped with a defoaming device 4tt.

FIG. 5 is an enlarged view of the defoamer of FIG. 3, shown in longitudinal section. Figure 5 is a plan view of Figure 5.

The female thread at the center of the boss jJ of defoamer #de is screwed into the male thread of the straight pipe at end, and an umbrella-shaped water sprinkling plate j41 is placed at a distance from the straight pipe daj end with the boss octopus in the center. - fixed to the radial arm 3J with one end fixed to the boss j
Connected to J.

In this embodiment, the aeration air passes through a silencer, an air inlet pipe, and is drawn directly into the aerator. When the on-off valve 3 is opened to the defoamer Dub, the liquid to be treated flows through the short pipe 1I4, elbow duct, and straight pipe DA S from the straight pipe DA T to the water sprinkling plate! The water collides with the center of the sand, changes direction and spreads along the water sprinkling plate SO, and is sprayed onto the sand and foam in the defoaming chamber, effectively extinguishing the foam.

In the present invention, since the aeration tank is sealed and a small defoaming chamber is provided above the ceiling wall, the effective capacity of the aeration tank is increased.

Defoaming is carried out effectively in a small defoaming chamber,
The defoamer needs to be small.

In each of the embodiments, a submersible motor pump was used to send liquid to the 4-air system, but a land pump may also be used.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention, FIG. 1 is a plan view of FIG.
FIG.
FIG. 1 is a partially enlarged view of FIG. 3, and FIG. 6 is a plan view of FIG. 3. L... @ air tank K... tank bottom J... Shu Ii-tei...
・Ceiling at...Defoaming chamber 4...Lid...Aeration device itt...Motor Su...Pump lo...Submersible motor pump//...Discharge port /C...Nozzle Main body /J...Diff user /41...Air introduction pipe /1...Defoamer/9...Outer cylinder 2/...Motor -Co...Baseco 3...Bubble cutter -Da...
・Silencer ko3...Discharge'k Jl...Opening/closing valve J
l...Liquid pipe 3. Jg...Float switch Dako...Erase ms 4
It...Opening/closing valve Dub...Defoamer. Patent Applicant Ebara Corporation Agent Arai - Department Figures 3, 1, 5, and 6

Claims (1)

[Claims] l In an aeration tank with a closed structure, an aeration tank is provided with a defoaming chamber equipped with a defoaming device that opens into the aeration tank above the aeration tank ceiling wall and has a smaller floor area than the aeration tank floor area.