JPH0647598Y2 - Sewage treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sewage treatment apparatus, and more specifically, in the sewage treatment apparatus, sewage is transferred in a fixed amount regardless of fluctuations of inflowing sewage to equalize the treatment amount. It is about technology.

[Prior Art] Generally, by equalizing the fluctuation of the inflow of inflow water, the efficiency of wastewater treatment can be improved and stabilized, and the personnel to be treated also in the structural standard (Ministry of Construction Notification No. 1292). If there are large fluctuations in the inflow of 201 people or more, it is stipulated that the structure be such that the flow can be adjusted, and the standard is also shown. A quantitative pumping pump is also used to transfer a certain amount of wastewater from a primary treatment tank such as a settling tank to a secondary treatment tank such as a contact aeration tank. Pumping pump is expensive, requires electric piping to the pump that can be immersed in the primary treatment tank, is troublesome to prevent leakage, and may cause clogging, making maintenance and inspection difficult. There was a problem.

[Problems to be solved by the invention] By the way, although a means of supplying air into a pipe such as a pipe and pumping it with an air lift is also conceivable, when the sewage water level of the primary treatment tank fluctuates greatly, The amount of pumped water due to the lift also fluctuates, clogging is less likely to occur, and it is difficult to adopt an air lift means that allows relatively easy maintenance. By the way, the theoretical formula of the air lift pump is Qa / Q ≈ (H + hl) / {10log e [(Hs + 10) / 10]} where H; pumping head Q; pumping volume Qa; air volume hl; total loss head (friction of pumping pipe) Loss, discharge speed loss, slip loss between bubbles and water, etc.) Hs; Inundation depth And, as shown in the above equation, 1 When the inundation depth becomes deeper, the pumped water quantity Q increases.

 〃 Shallow 〃 〃 Q 〃 2 When head H is high, 〃 Q is 〃 〃 Low 〃 〃 Q increases.

If the water depth constantly fluctuates, it is extremely difficult to quantitatively advect it from the primary treatment tank to the secondary treatment tank.

The present invention has been made in view of such a problem, and an object thereof is to adopt an air lift form to pump a substantially constant amount of dirty water, thereby improving the advantages of the air lift form. The present invention aims to provide a sewage treatment apparatus that can perform quantitative advection regardless of changes in water depth while making good use of it.

[Means for Solving the Problems] The sewage treatment apparatus of the present invention comprises a primary pumping route 4 for pumping air from the primary treatment tank 1 to the water level adjusting tank 3 by an air lift, and a water level adjusting tank 3 to the secondary treating tank 2. The secondary pumping path 5 for pumping water by an air lift is provided, and the water level adjusting tank 3 is configured to be an overflow type and the overflow water is configured to be returned to the primary treatment tank 1. .

[Operation] As described above, the primary pumping path 4 for pumping water from the primary treatment tank 1 to the water level adjusting tank 3 by the air lift, and the secondary pumping path for pumping water from the water level adjusting tank 3 to the secondary processing tank 2 by the air lift 5, the water level adjusting tank 3 is configured to be an overflow type and the overflow water is returned to the primary treatment tank 1, so that an air lift is used to pump water from the primary treatment tank 1 to the secondary treatment tank 2. The air lift pump for the air lift can be installed outside the tank as compared with the conventional structure in which the pump is submerged in the primary treatment tank 1, which causes problems with clogging of the pump and underwater wiring. The water level adjusting tank 3 is an overflow type, and the secondary lifting from the water level adjusting tank 3 can be carried out by avoiding the When advancing sewage through the water path 5 by air lift, by making the amount of air to the secondary pumping path 5 constant, the transfer rate can be made almost constant. The problem of fixed amount advection in the air lift mode is solved, and fixed amount advection can be performed by the air lift.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

A primary treatment tank 1 such as a precipitation tank and a secondary treatment tank 2 such as an aeration tank are arranged side by side through a partition wall 6. An inflow pipe 7 for inflowing sewage is connected to the primary treatment tank 1. The sewage flowing in from the inflow pipe 7 fluctuates with time, and the water level in the primary treatment tank 1 fluctuates as indicated by h in FIG. A water level adjusting tank 3 is attached to the upper part of the primary treatment tank 1 so as to be connected to the partition wall 6. A primary pumping path 4 composed of a pipe material that is pumped by an air lift from the primary treatment tank 1 to the water level adjusting tank 3 is provided, and the tip of an air pipe 8 is exposed at the lower end of the primary pumping path 4 to form an air pump. (Not shown)
Air supplied from the air pipe 8 to the air pipe 8 is discharged into the primary pumping path 4, and the sewage in the primary pumping path 4 can be pumped into the water level adjusting tank 3 by the air lift action accompanying the rise of this air. I am doing it.

An L-shaped secondary pumping path 5 made of a pipe material that is pumped by an air lift from the water level adjusting tank 3 to the secondary treatment tank 2 is provided, and the tip of the air pipe 9 is provided at the lower end of the secondary pumping path 5. The air supplied from the air pump (not shown) to the air pipe 9 is discharged into the secondary pumping path 5, and the sewage in the water level adjusting tank 3 is removed by the air lift action accompanying the rise of this air. The secondary treatment tank 2 can be pumped up. The water level adjusting tank 3 is configured as an overflow type, and the primary treatment tank 1 of the water level adjusting tank 3 is used.
The height of the side wall 10 on the side is made lower than the height of the opposite side wall so that the sewage overflowed from the water level adjusting tank 3 can be returned to the primary treatment tank 1.

Then, the pumping from the primary treatment tank 1 to the water level adjusting tank 3 and the pumping from the water level adjusting tank 3 to the secondary processing tank 2 are carried out by using an air lift, respectively. An air lift pump for air lift is installed outside the tank compared to the one that is submerged in 1.
The problems associated with pumping pump clogging and underwater wiring can be avoided, and maintenance can be performed easily. In this way, the water level adjusting tank 3 is an overflow type while making good use of the air lift form, and it is necessary to use the air lift to transfer the dirty water from the water level adjusting tank 3 to the secondary pumping path 5. By making the amount of air to the next pumping water channel 5 constant, the flow rate is made substantially constant, the problem of constant flow advancing due to the water level fluctuation in the air lift form is solved, and the fixed amount is measured by the air lift.

In such a case, the longer the length l of the air pipe 9 that has penetrated into the water level adjusting tank 3 is, the more the pumping amount of the dirty water by the air lift can be stabilized. Then, by continuously controlling the supply of air to the air pipe 9, the amount of pumped water in the secondary pumped water passage 5 increases within a predetermined time,
There is no problem even if the water level L drops to some extent.

FIG. 2 shows another embodiment, in which a flow rate adjusting valve 11 is provided between the water level adjusting tank 3 and the secondary processing tank 2 and overflows from this flow rate adjusting valve 11 to cause a small amount in the secondary processing tank 2. It is also possible to carry out quantitative advection.

FIG. 3 shows still another embodiment, in which the mouth level area of the water level adjusting tank 3 is widened and the depth D of the pipe material of the secondary pumping passage 5 below the water surface is deepened. By increasing the depth D of the secondary pumping path 5 below the surface of the water in this manner, the pumping efficiency is increased and the pumping amount is increased.
When the water depth is shallow, air and water are separated, resulting in a discontinuous discharge state, which impairs quantitativeness.However, by increasing the water depth, water and air bubbles are mixed and discharge is performed in a connected manner. By increasing the quantitative advection property and widening the mouth area, it is possible to pump the sewage from the water level adjusting tank 3 to the secondary treatment tank 2 so that the fluctuation of the water depth is reduced and the air lift quantitativeness is improved. Is to maintain.

[Effects of the Invention] In summary, the present invention provides a primary pumping path for pumping water from the primary treatment tank by the water level adjusting tank hair lift and a secondary pumping path for pumping water from the water level adjusting tank to the secondary processing tank by an air lift. Since the water level adjusting tank is configured as an overflow type and the overflow water is configured to be returned to the primary processing tank, pumping from the primary processing tank to the secondary processing tank is performed by using an air lift, The air lift pump for air lift can be installed outside the tank as compared with the conventional structure where the pump is submerged in the primary treatment tank, avoiding problems with the pump pump clogging and underwater wiring, and its maintenance. The water level adjusting tank is an overflow type while making good use of the air lift form, so the water level adjusting tank is connected to the secondary pumping route. When advancing sewage with an air lift, by making the amount of air to the secondary pumping path constant, the transfer flow rate can be made almost constant, and while adopting the air lift form,
There is an advantage that the problem of constant flow advection in the air lift form is solved, and the constant flow advection can be performed by the air lift.

[Brief description of drawings]

FIG. 1 is a partially schematic sectional view of an embodiment of the present invention, and FIG.
The drawing is a partial cross-sectional view of another embodiment of the same as above, and FIG. 3 is a cross-sectional view of still another embodiment of the same as above. 1 is a primary treatment tank, 2 is a secondary treatment tank, 3 is a water level adjusting tank, 4 Is a primary pumping route and 5 is a secondary pumping route.

Front page continuation (72) Inventor Shiro Mizukoshi 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References: 52-171161 (JP, U) )

Claims (1)

[Scope of utility model registration request] 1. A primary treatment tank such as a precipitation tank, a secondary treatment tank such as a contact aeration tank, a water level adjusting tank, and a primary pumping path for pumping water from the primary processing tank to the water level adjusting tank by an air lift. Sewage with a secondary pumping path for pumping water from the water level adjusting tank to the secondary treatment tank by an air lift, and configuring the water level adjusting tank as an overflow type and returning the overflow water to the primary treatment tank Processing equipment.