JPH0344320Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is installed in a batch-type treatment equipment that performs the aeration, precipitation, and discharge processes of organic sewage in the same tank and purifies it using the activated sludge method. This relates to a supernatant water discharge device.

(Prior Art) Conventionally, as a supernatant water discharge device for a batch type sewage treatment device, there is a device as shown in FIG. 3, for example. That is, in FIG. 3, wastewater can flow into a treatment tank 51, and an outflow pipe 52 communicating with the outside is provided on the bottom side of this treatment tank 51. A discharge pipe 53 made of an elastic material is swingably connected to the discharge pipe 23.
The upper end is connected to a trough 54 from which supernatant water can be discharged, and a wearer 55 is attached to a part of this trough 54, and air tanks 56, 56 are attached to the trough 54. It is configured.

(Problem to be solved by the invention) In the above-mentioned conventional supernatant water discharge device, the sewage that has flowed into the treatment tank 51 is first aerated in the treatment tank 51, and after the aeration, sludge sedimentation occurs in the treatment tank 51. After precipitation, the supernatant water is poured into a trough 54 from above.
The air tank 56 is configured to move downward as the water level of the supernatant water drops, and gradually discharge the supernatant water to the outside. During the aeration process, sewage often flows into the trough 54 from the wearer 55, and the sewage that has flowed into the trough 54 and the discharge pipe 53 during the discharge process after settling is also discharged into the trough 54 at the beginning of the discharge process. Since it is discharged together with clear water, it is necessary to circulate the initial supernatant water into the treatment tank 51 again for reprocessing, which poses a problem in that the sorting of the treated water becomes complicated.

In addition, in the conventional structure, since the discharge pipe 53 swings, there is a problem that there are many moving parts, making maintenance difficult.Also, since the discharge pipe 53 is made of an elastic member, its durability etc. There was a problem.

The present invention was devised in view of the above-mentioned conventional problems, and is a supernatant water discharge device that is easy to maintain, can discharge supernatant water well, has low equipment costs, and has high processing efficiency. The purpose is not to provide

(Means for Solving the Problems) In order to achieve the above object, the present invention is based on a supernatant water discharge device for a batch-type sewage treatment system that performs aeration, precipitation, and discharge processes of organic sewage in the same tank. The supernatant water discharge device includes a baffle member fixedly disposed on the sludge interface in the sewage treatment tank to prevent sludge from rolling up, and a supernatant water discharge device fixedly installed on the baffle member. The present invention is mainly composed of a pump and an air lift device connected to the bottom surface of the baffle member so as to be able to discharge sludge accumulated on the baffle member to the outside.

(Function) The baffle member is fixedly disposed on the sludge interface in the treatment tank, and the supernatant water discharge pump is fixedly installed above the baffle member, so there are no moving parts like in the past. In addition to reducing equipment costs, etc.,
Driving operations can be made easier. In addition, even when sludge accumulates on the baffle member during the settling process, the accumulated sludge can be efficiently discharged to the outside via the air lift device, so only the supernatant water can be effectively drawn out from the supernatant water discharge pump. I can do it.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows an overall schematic configuration diagram of this embodiment, and FIG. 2 shows an enlarged view of the main parts.

In the figure, a sewage treatment tank 1 is formed with a circular cross section, and sewage can flow into the tank.
When sewage flows into the sewage treatment tank 1, it is filled with sewage up to the full water line indicated by H, W, and L in FIG.

A baffle member 2 is located approximately in the center of this sewage treatment tank 1.
As shown in the enlarged view in Fig. 2, this current blocking member 2 is formed of a material such as FRP and has a funnel shape with an expanded upper part. The flow member 2 is a fixed part of the sewage treatment tank 1, and the fixed legs 3, 3 allow the sewage treatment tank 1 to be fixed.
Fixed inside. The arrangement position of this baffle member 2 is located above the sludge interface indicated by O and L in FIG. This sludge interface O.L is a line calculated based on experimental values, etc., and the baffle member 2 is fixed slightly above this sludge interface O.L.

A supernatant water discharge pump 5 is fixedly installed above this baffle member 2 via leg rods 4, 4, and a supernatant water discharge pump 5 is connected to a treated water pit or the like at the upper end of the supernatant water discharge pump 5. A tube 6 is connected.

In addition, a communication pipe 7 is connected to the center of the bottom surface of the baffle member 2 in a hanging manner, and the lower end of this communication pipe 7 is bent and connected to an air lift pipe 8. It is piped to the tank.

Further, an air pressure feed pipe 9 is connected to the lower end of the air lift pipe 8 in a branched manner.

Further, an air diffuser 11 is provided below the fixed leg 3.
The air diffuser 11 is made of, for example, a porous ceramic tube, and is connected in communication with an external blower (not shown). Air is pumped into the sewage treatment tank 1 from the air diffuser 11.
The wastewater is aerated by being diffused into the wastewater.

Furthermore, a sludge extraction pump 10 is disposed inside the sewage treatment tank 1, and is configured to be able to extract settled sludge to the outside.

In this embodiment of the supernatant water discharge device configured as described above, sewage first flows into the sewage treatment tank 1 from the outside, and after flowing into the H, W, and L lines, the air diffuser is installed as described above. Air is aerated into the wastewater through the wastewater treatment tank 1, and an aeration process is started within the wastewater treatment tank 1. This aeration step is carried out for about 4 hours, for example.

After the aeration process is completed, a settling process takes place for about 1 hour, at which time the sludge in the sewage sinks downward, and the sludge settles below the sludge interface O/L mentioned above.
Supernatant water will be separated above it.

In this example, sludge is accumulated on the upper surface side of the baffle member 2 during the settling process, but the sludge accumulated on the baffle member 2 is transferred to the air diffuser 11 at the end of the settling process. Air is force-fed to the air pressure feed pipe 9 for about 30 seconds by a blower for supplying the air, and the pressure-fed air is circulated from the air pressure feed pipe 9 to the air lift pipe 8. At this time, the baffle member 2
The sludge accumulated on the upper surface side of the sludge is pulled out through the communication pipe 7, ascends the air lift pipe 8 by the air lift action, and is drawn into the sludge concentration storage tank. Therefore, no sludge exists on the upper surface side of the baffle member 2 during the discharge process performed after the settling process.
By operating the supernatant water discharge pump 5 in this state, the supernatant water is discharged to the outside via the supernatant water discharge pipe 6.

When the supernatant water discharge pump 5 operates, supernatant water is sucked from below the supernatant water discharge pump 5 and discharged from the supernatant water discharge pipe 6, but in this example, a baffle member 2 is provided below the supernatant water discharge pump 5. , the sludge below is not kicked up when the supernatant water discharge pump 5 is operated, and only the supernatant water can be drawn out to the outside.

In addition, when this baffle member 2 is not present, the L, W, and L lines shown in FIG. If you let it suck up,
The sludge is rolled up and the sludge is also sucked up at the same time, but in this example, since the baffle member 2 is arranged below the supernatant water discharge pump 5, the arrangement position of the supernatant water discharge pump 5 is changed from L to W.・It can be installed below the L line, and the lowest water level at which supernatant water can be drawn out can be set lower than before.
The margin height between the L lines can be set narrower than before. Conventionally, the margin height A required 25 cm or more, but in this example, it can be set to about 12 to 13 cm, reducing the margin height. By being able to reduce the depth A, the amount of supernatant water that can be drawn out is increased compared to conventional devices, and the processing capacity is significantly improved.

In this way, in this example, we used a fixed supernatant water discharge device instead of a movable one like in the past.
The durability of the entire device is increased, maintenance is facilitated, and equipment costs are reduced. Moreover,
In the process of discharging supernatant water, the baffle member 2 prevents sludge from rolling up, and the margin height A can be reduced accordingly, increasing the ability to draw out supernatant water and improving treatment efficiency. .

In this example, the sewage treatment tank 1 has a circular cross section, but it may also have an angular cross section, and the baffle member 2 is funnel-shaped in this example, but the sludge It may be of any other shape as long as it can effectively prevent the winding up.

(Effect of the invention) The supernatant water discharge device of the present invention includes a baffle member fixedly disposed on the sludge interface in a sewage treatment tank to prevent sludge from rolling up, and a baffle member fixedly installed on the baffle member. The structure mainly consists of a supernatant water discharge pump and an air lift device connected to the bottom of the baffle member so that the sludge accumulated on the baffle member can be discharged to the outside. As a result, rolling up of sludge is effectively prevented, the extra height can be reduced accordingly, more supernatant water can be drawn out, and the processing capacity can be greatly increased.

Furthermore, since the entire device is fixedly installed within the sewage treatment tank, the equipment cost is low and maintenance is easy, and since there are no moving parts, durability is greatly improved.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figure 1 is a schematic diagram of the supernatant water discharge device of this example, Figure 2 is an enlarged view of the main parts of Figure 1, and Figure 3 is a schematic diagram of the conventional device. be. 1... Sewage treatment tank, 2... Blocking member, 3... Fixed leg,
5...Supernatant water discharge pump, 6...Supernatant water discharge pipe, 7...
Communication pipe, 8... Air lift pipe} Air lift device, 9
...Air pressure pipe, O/L...Sludge interface, A...Marginal height.

Claims (1)

[Scope of utility model registration request] This is a supernatant water discharge device for a batch-type sewage treatment system that performs aeration, precipitation, and discharge processes of organic sewage in the same tank, and the supernatant water discharge device is arranged in a fixed manner on the sludge interface in the sewage treatment tank. A baffle member is installed to prevent sludge from rolling up, a supernatant water discharge pump is fixedly installed on the baffle member, and a bottom surface of the baffle member is provided so that the sludge accumulated on the baffle member can be discharged to the outside. 1. A supernatant water discharge device for a batch-type sewage treatment device, characterized in that it is mainly configured with a connected air lift device.