JPH02187197A - Sewage disposal apparatus - Google Patents

Abstract

PURPOSE:To prevent the generation of offensive smell and noise by constituting an air space in a room containing an air lift pipe pumping up water to a constant water level auxiliary tank and a secondary treatment tank to lift sewage by air lift effect. CONSTITUTION:When an air pump 7 is driven, the air of an air space 6 is sucked to be supplied to the lower end of an air lift pipe 4. Air bubbles rise through the air lift pipe 4 to be pumped up by the air lift pipe 4 and sewage is transferred to a constant water level auxiliary tank 3 from a primary treatment tank 1 and further transferred to a secondary treatment tank 2 from the constant water level auxiliary tank 3. The air used in the pumping-up of water is discharged to the air space 6 and sucked by the air pump 7 to be recirculated. Since air is recirculated in the order of the air space 6, the air pump 7, the air lift pipe 4 and the air space 6 in a hermetically closed state to pump up water, no offensive smell is leaked.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to a technology for leveling the treatment volume by transferring a fixed amount of wastewater in a wastewater treatment equipment regardless of fluctuations in inflowing wastewater. This relates to technology that prevents the generation of noise.

[Prior art 1] As shown in Fig. 6, an air supply pipe IJ is connected to the end of an air lift pipe a, and air is supplied from an air supply pipe b. As the air bubbles rise, the water is pumped up and released from the outlet C at the top of the air lift vibe a.

[Problems to be Solved by the Invention] By the way, the air lift device can pump water with a simple structure, but when this air IJ7) device is used in a sewage treatment device to pump sewage, the sewage is agitated, The odor was generated inside the tank, and the air used to pump water released the odor outside the tank, causing odor problems. In addition, noise problems were caused by the noise generated when the airlift pumped water. In other words, in the part A of Fig. 6, the wastewater is stirred and smells are generated as shown by the arrow, and in the mouth part of Fig. 6, the odor is released and noise is generated as shown by the arrow. In the area shown by the arrow, the sewage is stirred, emitting odors and generating noise.

The present invention has been made in view of the above points, and an object of the present invention is to provide a sewage treatment device that can prevent the generation of odor and reduce the generation of noise. The purpose of this invention is to provide a sewage treatment device that can stabilize the water level and improve quantitative transfer performance.

1] Means for Solving the 12 Problems 1 In order to achieve the above object, the sewage treatment apparatus of the present invention provides a system in which a primary treatment tank 1 such as a submerged tank and a secondary treatment tank 2 such as a contact atomization tank are provided. In a sewage treatment device in which a constant water level auxiliary tank 3 is provided and sewage is transferred from the primary treatment tank 1 to the constant water level auxiliary tank 3 and from the constant water level auxiliary WI 3 to the secondary treatment tank 2 by an air lift, the constant water level auxiliary tank 3 and secondary treatment [
Air pumping to 2] 7 Lid 5 to the room containing pipe 4
, a wall, a vibrator, sewage at the bottom, etc. constitute a sealed air space 6, and this air space 6, an air pump 7, and an air 1
]7 Air is circulated between the pipes 4 in a sealed manner to air lift the wastewater. Also, below the lower end of the first air lift vibe 4a that pumps wastewater from the primary treatment tank 1 to the constant water level auxiliary tank 3, and the lower end of the over 70-vibe 8 that overflows the wastewater from the constant water level auxiliary tank 3 to the primary treatment tank 1. The partition wall 9 of the room where the outlet of the air lift pipe 4b of the tjIJ2 that pumps wastewater from the constant water level auxiliary tank 3 to the secondary treatment tank 2 is located is extended into the water, and the operation of the air lift F is performed. It is also preferable that the agitation effect due to the movement of wastewater is reduced. Furthermore, it is also preferable that a pressure absorbing means 1 for absorbing pressure changes in a chamber located at the inlet of the intake pipe 10 of the air pump 7 is provided.

[Function] When the air pump 7 is driven, the air in the air space 6 is sucked in and air is supplied to the lower end of the air lift pipe 4. Air bubbles rise through the air lift vibe 4 and are pumped up by the air lift pipe 4. Sewage is transferred from the primary treatment tank 1 to the constant water level auxiliary tank 3, and from the constant water level auxiliary tank 3 to the secondary treatment tank 2, and the air used for pumping is released into the air space 6 and pumped into the air pump 7. is inhaled and circulated. In this way, air is circulated in the air space 6, air pump 7, F-lift pipe 4, and air space 6 in this order in a sealed manner to pump up water, so no odor leaks. Moreover, since the wastewater pumped up by the air lift vibrator 4 is discharged within the air space 6, no noise is generated.

[Example] First, the embodiment shown in FIGS. 1 and 2 will be described.

A primary treatment tank 1 such as a settling tank and a secondary treatment tank 2 such as a contact atomization tank are installed adjacent to each other.
A constant water level auxiliary tank 3 is installed in the upper part of the tank. The first air lift vibe 4a of the air lift vibe 4 is installed between the primary treatment tank 1 and the constant water level auxiliary tank 3, and the WIJ
The inlet 12 of the air lift vibrator 4a opens below the primary treatment tank 1, and the second air lift pipe 4
The discharge port 13 of b is opened at the upper part of the constant water level auxiliary tank 3. 177) The vibrator 4b is installed between the constant water level auxiliary tank 3 and the secondary treatment tank 2, and is located at the inlet 14 of the second air lift pipe 4b.
is opened to the constant water level auxiliary tank 3, and the discharge port 15 of the second air lift pipe 4b is opened to the secondary treatment tank 2. The constant water level auxiliary tank 3 is provided with an overflow port 16, and an overflow pipe 8 is extended from the overflow port 16 into the primary treatment tank 1. Another secondary road J! ! ! A frame portion 9b is provided as a partition wall 9 in the tank 2 so as to surround the discharge port 15 of the second air lift pipe 4b, and the interior of the secondary treatment tank 2 is divided into a portion with the discharge port 15 and a portion without the discharge port 15. There is a partition. A lid 5 is attached to cover the upper opening of the area between the upper surfaces of the constant water level auxiliary tank 3 and the frame portion 9b''C, and the lid 5, the constant water level auxiliary tank 3, and the frame portion 9b
, an air space 6 surrounded by an air lift pipe 4 and an overflow pipe 8. The air pump 7 is installed outside the tank, and an intake pipe 10 and a supply pipe 17 are connected from the air pump 7. The supply pipe 17 is the first supply pipe 1
7a and a second supply pipe 17b, the tip of the first supply pipe 17a faces the inlet 12 of the first air lift pipe 4a, and the tip of the second supply pipe 17b faces W.
52, facing the inlet 14 of the air lift pipe 4b. A switching valve 19 such as an on-off valve is arranged in the middle of the second supply pipe 17b. The tip of the intake pipe 10 communicates with the air space 6 at a position where the frame portion 9 is located.

Now, with the switching valve 19 closed, the first supply pipe 17a
When air is supplied from the primary treatment tank 1 to the constant water level auxiliary tank 3, the air bubbles rise through the lift pipe 4a and sewage is pumped from the primary treatment tank 1 to the constant water level auxiliary tank 3. At this time, the constant water level auxiliary tank 3 has an over 70-low 16, and the sewage above a certain water level is returned from the overflow port 16 through the overflow pipe 8 to maintain a constant water level in the constant water level auxiliary tank 3. It will be done. Next, as shown in FIG. 2, when the switching valve 19 is closed, air is supplied from the supply pipe 17b of PttJ2 to the inlet 14 of the second air lift pipe 4b, and air bubbles are removed from the second air lift pipe 4b.
(At this time, by setting L2<Ll, the air flows toward the second air lift pipe 4) with less resistance. Also, use two air pumps to connect each air lift pipe 4a.
, 4b may be independently assigned to control the pump on and off. In this case, the switching valve 19 is not required.

) A certain amount of wastewater is transferred to the secondary treatment tank 2 by sending air for a certain period of time. At this time, air lift pipe 4
The air released from &, 4b into the air space 6 is sucked into the air pump 7 and discharged again, so that the air space 6
The air will be circulated and will not be released outside the tank. This circulating air contains a lot of odor. Also, when water is being pumped up by the air lift pipe 4, the water surface W
, the water surface W2 is violently agitated and a larger amount of odor is generated than the water surface, but the odor components released are the walls of the constant water level auxiliary tank 3, the frame 9b1, the water surface W2, the lid 5, the water surface W2, and the air lift pipe. 4. It is confined by the overflow pipe 8 and circulated by the air pump 7, so it does not leak to the outside.

In addition, the lid 5, constant water level auxiliary tank 3, and frame portion 9I) also block noise generated during air lift, making it possible to achieve low noise with less leakage to the outside. Further, the operation of the air pump 7 will be explained in detail as follows. First, when air is supplied from the air pump 7 to the first air lift pipe 4a, the water level in the constant water level auxiliary tank 3 rises, and when it reaches the over 70-low 16, it overflows and the water level is maintained. Then P
IIJ2 air lift) Open the switching valve 19 using a solenoid or the like to send air to the pipe 4b. At this time, the supply pipe 17 of the air pump 7 is connected to both the first air lift pipe 4a and the second F-lift pipe 4b, but the air flows to the second air lift pipe 4b, which has a shallow water depth, and is kept constant. When the water is pumped and transferred for a certain period of time, the air pump 7 is stopped and the water pumping is stopped. If this cycle is shown in the diagram, the third
As shown in the figure. In this way, the operation time for pumping water by the air lift pipe 4 can be shortened as much as possible, the generation of odor and noise due to stirring can be prevented, and it is also preferable to save the electricity bill of the air pump 7.

Next, the embodiment shown in FIG. 4 will be described. In the case of this embodiment, the lower portions of the first air lift pipe 4a and the overflow pipe 8 are extended below the constant water level auxiliary tank 3, and the constant water level auxiliary W! Below I3, inside the primary treatment tank 1, a frame 9a is provided as a partition wall 9 to surround the lower part of the first airlift pipe 4a and the oats 70-no (eve 8), and the inside of the primary treatment tank 1 is 1 air lift pipe 4a
There is also a partition between the part with the overflow pipe 8 and the part without it. The frame portion 9a extends so that the lower end of the frame portion 9a is located below the lower end of the air pipe 4a of 11IJ1 and the lower end of the overflow pipe 8.

Also, in the secondary treatment tank 2, similarly to the above embodiment, the frame portion 9b serves as the partition wall 9 and is connected to the discharge port 1 of the second air lift pipe 4b.
5, and the inside of the secondary treatment If42 is partitioned into a part with the discharge port 15 and a part without it.

Other configurations and operations are the same as those of the embodiment shown in FIGS. 1 and 2. Incidentally, the part of the air lift pipe 4 facing the air space 6 can prevent the occurrence of odor due to the airtight structure of the air space 6, but the part of the air lift pipe 4 that faces the air space 6 can be prevented from generating odors. At the discharge port 15 of the air lift pipe 4b, agitation occurs due to the flow of wastewater, and the primary treatment tank 1
This may agitate the water surface of the secondary treatment tank 2 and cause odor during operation. However, in the case of the embodiment shown in FIG. 4, the frames 9a and 9b are provided as partition walls to concentrate the agitated parts in one part, so that the agitation is carried out only in the primary treatment tank 1 or the secondary treatment tank. This prevents odor from reaching other parts of the tank 2, thereby preventing odor from being released due to stirring. At this time, the deeper the frame parts 9a, 9b as the partition wall 9, the more effective the effect.

Next, the embodiment shown in Fig. PJ5 will be described. In this embodiment, a pressure absorbing means 1 for absorbing pressure changes in a chamber located at the inlet of the intake pipe 10 of the air pump 7 is provided.

As an example of this pressure absorbing means 1], a bellows tube 1]a is provided, and the pressure in the air space 6 can be kept constant by expanding and contracting the bellows tube 1]a. The other side of the pressure absorbing means 1] is the suction valve 1]b and the discharge valve lie.
'ζ is provided so that the pressure i14 in the air space 6 can be adjusted by sucking some air from the suction valve flb and discharging it from the discharge valve lie. In other words, during pumping, when air is circulated due to fluctuations in the water surface W1, etc., the pressure of the air in the air space 6 changes slightly. discharge valve lie
If , the pressure in the air space 6 will be l1lI! I
L, the pressure inside the air space 6 can be maintained at a state close to atmospheric pressure. Therefore, it is possible to prevent adverse effects such as a decrease in pump efficiency due to air pressure fluctuations in the air space 6, and furthermore, it is possible to maintain the quantitative quality of the amount of pumped water over a long period of time.

[Effects of the Invention] As described above, the present invention provides a lid, wall, pipe,
A sealed air space is formed with sewage, etc. at the bottom, and air is circulated in a sealed manner between this air space, the air pump, and the air lift pipe to air lift the sewage, so the same air containing odors is removed. It circulates the water and removes it by pumping, and it prevents odor-containing air from leaking to the outside and prevents odor problems.It also reduces noise when pumping and discharging water with the Air IJ7 Tovibe. It is also possible to reduce noise by trapping it in and insulating it. Furthermore, although it is desirable that fresh air not be fed into the rice settling tank for anaerobic microbial treatment, it is preferable to circulate the air so that air with a low oxygen concentration flows through the tank. In addition, in the invention according to claim 2 of the present invention, the lower end of the air lift pipe of tjIJl that lifts sewage from the primary treatment tank to the constant water level auxiliary tank and the overflow that overflows the sewage from the constant water level auxiliary tank to the primary treatment tank A partition wall is extended below the lower end of the pipe, and the partition wall of the room where the discharge port of the second air lift pipe that pumps wastewater from the constant water level auxiliary tank to the secondary treatment tank is located is extended into the water. Since the agitation effect caused by the movement of sewage during operation is reduced, the influence of agitation on sewage can be reduced and the generation of odors can be further prevented. Furthermore, according to the third aspect of the present invention, since the pressure absorbing means for absorbing pressure changes in the chamber located at the entrance of the intake pipe of the air pump is provided, pressure fluctuations in the sealed air space can be reduced. This allows for a stable and constant supply of air.

[Brief Description of the Drawings] Figure 1 is a cross-sectional view of an embodiment of the present invention when water is pumped to a constant water level auxiliary tank, and Figure 2 is a cross-sectional view of a state in which water is quantitatively transferred to the same secondary treatment tank. Figure fIfJ3 is an explanatory diagram explaining the pumping operation of the same as above, Figures 4 and 5 are sectional views of other embodiments of the same, and Figure #46 is a schematic diagram explaining the conventional example,
1 is a primary treatment tank, 2 is a secondary treatment tank, 3 is a constant water level auxiliary tank,
4 is an air lift pipe, 4a is FIIJl's air lift pipe, 4b is a second air lift pipe, 5 is a lid, 6 is an air space, 7 is an air pump, 8 is an overflow pipe, 9 is a partition wall, 10 is an intake pipe , 1] is a pressure absorbing means. Agent Patent Attorney Ishi 1) Ai Shichi*3

Claims (1)

[Scope of Claims] [1] A constant water level auxiliary tank is provided between a primary treatment tank such as a sedimentation tank and a secondary treatment tank such as a contact atomization tank, and a constant water level auxiliary tank is provided from the primary treatment tank to a constant water level auxiliary tank. In a sewage treatment system in which sewage is transferred from a constant water level auxiliary tank to a secondary treatment tank using an air lift, a lid, wall, pipe,
A sewage treatment system characterized by forming a sealed air space with sewage, etc. at the bottom, and air tightly circulating between this air space, an air pump, and an air lift pipe to air lift the sewage. Device. [2] Extend the bulkhead to a position below the lower end of the first air lift pipe that lifts sewage from the primary treatment tank to the constant water level auxiliary tank, or the lower end of the overflow pipe that overflows sewage from the constant water level auxiliary tank to the primary treatment tank. , the partition wall of the room where the outlet of the second air lift pipe that lifts wastewater from the constant water level auxiliary tank to the secondary treatment tank is located is extended into the water, and the stirring effect caused by the movement of the wastewater when the air lift is operated 2. The sewage treatment apparatus according to claim 1, wherein the sewage treatment apparatus is constructed in such a manner that the amount of waste water is reduced. [3] The sewage treatment apparatus according to claim 1 or 2, further comprising a pressure absorbing means for absorbing pressure changes in a room located at an inlet of an intake pipe of the air pump.