JPH0717398U - Sludge activation device in sewage treatment system - Google Patents

Abstract

(57) [Summary] [Purpose] The separation action of sludge and purified water has already progressed from the stage before entering the aeration tank, and the separation has progressed considerably when entering the aeration tank. Will be more effective, and the aeration tank capacity (area), construction cost, and power consumption will be significantly reduced. [Structure] A sludge activation device, which is connected to and communicates between pipes before and after arranged upstream of an aeration tank in a sewage treatment system, and has a diameter several times larger than that of the pipe arranged between the pipes. And at least one of an air supply means, a microorganism supply means, and an agitation means provided on the pipe.

Description

TECHNICAL FIELD The present invention relates to a sludge activating device in a sewage treatment system.

 [Technical background] In the sewage treatment system, as shown in FIG. 1, rainwater 1 and domestic sewage 2 flow into a water extraction station (pump station) 4 through a first pipe 3.

The sewage from the extraction station 4 flows into the preliminary aeration tank 7 / settling basin 8 through the second pipe 5 and the sand basin / screen 6. While passing through these, sewage is cleared of sand and large debris. Next, in the (main) aeration tank 9, the drooled water (activated sludge) containing microorganisms (such as a worm) is added, and the air is blown in and stirred. The micro-organisms adsorb the dirt in the sewage and are prone to sink, and are guided to the concentration tank 10 as sludge and then disposed of in the landfill 14 through the digestion tank 11, the dehydrator 12 and the incinerator 13. The sewage from the aeration tank 9 is led to a sedimentation pond (final sedimentation pond) 15, where microorganisms adsorbing dirt sink to the bottom of the pond, and purified water remains above.

The purified water is sterilized in the sterilization chamber 16 and then flowed into the river 17.

 [Problems to be resolved by the invention] In the sewage treatment system, aeration is performed after the preliminary aeration tank 7 and the aeration tank 9 are entered. After a long route without aeration, rapid aeration results in a very large load on these aeration tanks 7 and 9. As a result, these aeration tanks 7 and 9 have a considerably large capacity, which makes the construction difficult and costly, and because of the rapid aeration, it is often used for effective separation of sludge and purified water. It has the disadvantage of requiring power.

 In order to solve the above-mentioned problem, the problem of this invention is that the separation action of sludge and purified water has already progressed from the stage before entering the aeration tank, and the separation has progressed considerably when entering the aeration tank. This will enable the separation to proceed more effectively and to significantly reduce the capacity (area) of the aeration tank, construction costs, and power consumption.

 [Means for Solving the Problems] In order to solve the above problems, the present invention provides a sludge activating device which is connected to and communicates between front and rear pipes arranged upstream of an aeration tank in a sewage treatment system. And a pipe having a diameter several times larger than the pipe arranged between the two pipes, and at least one of an air supply unit, a microorganism supply unit, and a stirring unit provided on the pipe. And

 Embodiment Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

 FIG. 1 shows the sewage treatment system described above, and the sludge activating device according to the present invention is incorporated in the circled portion A. The location A is two locations upstream of the water extraction station 4 and between the water extraction station 4 and the sand basin 6, but the actual location is either or both of them. It may be provided at other locations.

 FIG. 2 illustrates the case where the device is installed in front of the water extraction station 4, for example.

The first pipes 3 are embedded in the soil while being separated from each other. A sludge activation device is installed between these pipes 3 and 3, and is connected and embedded. A pipe 25 having a diameter several times as large as that of the pipe 3 (about three times in the embodiment) is connected between the first pipes 3 and 3, and a stirring means 26 for causing aeration is provided on the upper portion of the pipe 25. It is a thing.

 A sludge discharge port 27 is opened at the bottom of the pipe 25. According to the apparatus of the embodiment, when the dirty water from the first pipe 3 enters the pipe 25, the pipe 25 has a sufficiently large diameter so that the flow velocity is rapidly reduced, whereby the separation causes the flow. While being effectively maintained, sludge easily accumulates in the lower part of the pipe 25 and is discharged through the sludge discharge port 27.

 This sludge is introduced into the hopper (not shown) before the dehydrator 12 shown in FIG. As the pipe 25, a tee (T-shaped one) which is one of the pipes can be used. The pipe 25 may be provided with an air introduction pipe and / or a microorganism introduction means.

 The embodiment shown in FIG. 3 is similar to the above-mentioned embodiment in that a pipe 30 having a large diameter is connected between the first pipes 3 and 3. Is provided with a microbial circulation supply means 32. The means 32 has a microorganism inside and is supplied by a pump.

 The means 32 is provided with a circulation introduction pipe 34 in addition to the outlet pipe 33 having a valve 35, and is also provided with a microorganism supply means 37 which can be opened and closed by a valve 36. Most of what flows from the first pipe 3 is sludge, and the sludge is usually not activated in most cases.

 Therefore, the microorganisms are supplied by the microorganism circulation supply means 32 and the air is supplied from the air introduction means 31.

 As a result, as shown in the figure, air and microorganisms are mixed into the sludge, the sludge is activated, the decomposition efficiency is improved, and the sludge flows. Sludge may be discharged from the lower part of the pipe 30.

 [Effect of the device] Since this device is constructed as described above, the separation action of sludge and purified water has already progressed from the stage before entering the aeration tank, and when it enters the aeration tank, the separation proceeds considerably. Therefore, the capacity (area) of the aeration tank, the construction cost, and the power consumption can be reduced simply by providing the above device.

[Brief description of drawings]

FIG. 1 is a flow sheet showing the arrangement of a sewage treatment system and this device incorporated in the same system, FIG. 2 is a schematic diagram showing a first embodiment of this device, and FIG. 3 is a second embodiment of this device. It is a schematic diagram which shows. 7, 9 ... Aeration tank 3 ... 1st pipe 25, 30 ... Pipe 31 ... Air introduction means 32 ... Microbe introduction means 26 ... Stirring means

Claims (1)

[Scope of utility model registration request] 1 A sludge activating device that is connected to and communicates between the front and rear pipes arranged upstream of the aeration tank in the sewage treatment system, and has a diameter several times larger than the pipe arranged between the pipes. And a sludge activation device in a sewage treatment system, which is provided in the pipe and is provided with at least one of an air supply unit, a microorganism supply unit, and a stirring unit.