JPS6322866B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sludge conditioning device for a septic tank.

The activated sludge method is currently the most commonly used method for small household human waste septic tanks and relatively large urban sewage septic tanks. However, although the activated sludge method is highly effective in removing pollutants,
Without maintenance, it will not perform the purifying function as expected. The most important inspection item in this maintenance management is to adjust the sludge concentration in the aeration tank to the range specified by the design conditions. As shown in Figure 2, urban sewage septic tanks are equipped with sludge storage tanks for sludge adjustment, but household septic tanks do not have sludge adjustment equipment, as shown in Figure 1, and maintenance and management is difficult. The current situation is that we are relying on the skills of the people involved.

The present invention has been made in view of the current situation, and its purpose is to adjust the sludge concentration in the aeration tank by greatly reducing the amount of activated sludge in the septic tank. We are in the process of providing equipment.

The present invention will be described in detail below with reference to illustrated embodiments.
First, I will explain the outline of this septic tank A.
As shown in Figure 3, this septic tank A is composed of a sludge conditioning device B, an aeration tank C, and a settling tank D, and the sewage stored in the aeration tank C is supplied to the sludge conditioning device B for dewatering. The dewatered sludge 8 is treated after drying. Further, water released by dewatering in the sludge conditioning device B and a small amount of sludge 8 separated during the dewatering operation will be returned to the aeration tank C. The supernatant liquid in the aeration tank C flows into the settling tank D, and after receiving sufficient precipitation, the clear liquid is discharged. Next, this sludge conditioning device B will be explained in detail.
A motor 12 is disposed at the center of the upper surface of the outer box 11, and a rotating shaft 14 supported by a bearing 13 is connected to the motor 1.
It is installed vertically from 2. The rotary dewatering drum 2 has a substantially cylindrical shape. To explain this rotary dewatering drum 2 in detail, the center of the ceiling surface 4 is concavely curved downward to form a cylindrical concave curved section 15, and a rotary shaft mounting hole 16 is provided at the center of the bottom of this cylindrical concave curved section 15. A rotary shaft 14 is bored and housed in a cylindrical concave portion 15.
A cylindrical concave portion 15 is fixed to the cylindrical concave portion 15. In addition, a large number of dehydration holes 5 are bored in the ceiling surface 4, and the bottom surface 6a
A sludge discharge hole 7 is bored in the center. Also,
This bottom surface 6a is formed to slope downward toward the sludge discharge hole 7. Next, to explain an example of these dimensional relationships, L = 300〓mmL ₁ = 190〓mmL ₂ =
If the dimensions of the drum are 120〓mmL ₃ = 180〓mmE ₁ = 240mmE ₂ = 60mm and E ₃ = 45゜, the rotation speed should be set to 2000r.pm or more. Note that the dehydration hole 5 needs to be 100 cm ² or more, and the shape may be round, square, oval, or open. The angle of _E3 can range from 0 to 60 degrees, and depending on the rotation speed, the bottom surface 6a may not be provided. One end of the sewage supply pipe 3 is immersed in the bottom of the aeration tank C, and the other end is inserted into the rotary dewatering drum 2 through the sludge discharge hole 7. The other end of the sewage supply pipe 3, ie, the nozzle position of the sewage jetting nozzle section 18, is disposed below the rotary dewatering drum 2 to prevent sludge from adhering to it during scraping. In addition, the angle of _E4 should be set at 0 to 80 degrees depending on the type of wastewater, jetting pressure, and jetting amount. Also, since sludge falls during the scraping process and adheres to the sewage jet nozzle and piping, it should be placed in an area where sludge will not fall. (i.e.,
Place it in the range of E ₅ . ) Also, this sewage supply pipe 3
A water pump P and a water pumping valve 30 are provided. Furthermore, a cleaning pipe 31 is connected between the pump P and the pumping valve 30, and the cleaning pipe 31 is provided with a cleaning valve 32. As shown in FIG. 6, the cross-sectional shape of the scraping blade 9 has an arc shape that swells in the rotational direction of the rotary dewatering drum 2. The other side edge of the scraping blade 9, that is, the cutting edge portion 19 has an uneven shape, a saw blade shape,
It is flat or corrugated. In addition, the scraping blade 9
A lever 20 is pulled out from the
A drive device 21 is attached to the lever 20, and the scraping blade 9 can be rotated via a lever 20.

This drive device 21 may be a cylinder as shown in the figure, or may be of some other type such as a screw. Further, as shown in FIG. 5, a filling portion 23 having a substantially triangular cross section is provided around the entire inner corner between the side wall 22 and the ceiling surface 4 of the rotary dewatering drum 2 to prevent water from accumulating in the inner corner. It is set as. A partition plate 24 is provided below the outer box 11.
A sludge fall hole 25 is provided directly below the sludge discharge hole 7. Furthermore, this sludge fall hole 2
5 is covered with a roof-shaped umbrella lid 26 that can be freely slid. Further, below the partition plate 24 is a storage chamber 27 for the sludge storage box 10. In addition, the partition plate 24 is provided with a droplet 28.
A return water pipe 29 led out from 8 is drawn into the aeration tank C. As a result, the motor 12 is activated to rotate the rotary dewatering drum 2 in a well-balanced manner via the bearing 13. When the rotation is normal, the water pump P
The sewage in the aeration tank C is sucked, and the sewage is ejected from the sewage jetting nozzle portion 18 onto the inner wall of the rotary dewatering drum 2 at a predetermined supply amount. The ejected sewage is centrifuged due to the difference in specific gravity, and the solid sludge 8 with a heavy specific gravity collects on the inner circumferential wall side of the rotary dewatering drum 2 and is piled up. On the other hand, water with a lighter specific gravity collects at the center farther from the inner circumferential wall than the sludge and is discharged from the dewatering holes 5 of the rotary dewatering drum 2 in the direction of arrow H. The discharged water passes through a drainage channel 33 constructed between the rotary dewatering drum 2 and the outer box 11, is led to a droplet 28 provided at the bottom 6, and is then led to a water return pipe 29.
It is returned to the aeration tank C through the As the centrifugal separation progresses, the amount of sludge 8 deposited and stacked on the inner peripheral wall of the rotary dewatering drum 2 increases and reaches a predetermined amount. When it is detected that the sludge 8 has reached a predetermined amount, the pump P is stopped, and the supply of sewage from the sewage jetting nozzle section 18 is stopped. After the pump P is stopped, the rotary dewatering drum 2 continues to operate in steady rotation to discharge the remaining water in the rotary dewatering drum 2. At this time, since the filling portion 23 is provided at the inner corner of the rotary dewatering drum 2, water does not accumulate in the inner corner, and all water is smoothly discharged. (If water accumulates in this inner corner, this water will be absorbed by the layered sludge 8 when the rotating dewatering drum 2 is stopped, causing the layered sludge 8 to peel off. Therefore, the water in this inner corner will be absorbed. ) Next, the umbrella lid 26 is required.
, place the sludge storage box 10 in the storage chamber 27 , and operate the lever 20 of the scraping blade 9 to rotate the blade edge 19 of the scraping blade 9 sequentially to the rotating dewatering drum 2 .
Press it against the inner wall and peel off the laminated sludge 8. The stripped sludge 8 passes through the sludge discharge hole 7 and is dropped into the sludge storage box 10. Afterwards, this sludge 8 is dried and treated. When the treatment of the sludge 8 is completed in this manner, the umbrella cover 26 is slid to fit into the sludge fall hole 25. Then, as described above, the rotary dewatering drum 2 is rotated to restart the supply of waste water. At this time, the umbrella lid 26
Since it is roof-shaped, the sludge discharge hole 7 is opened when the sludge 8 and water cannot be separated as specified when the rotation speed of the rotary dewatering drum 2 is other than the normal rotation speed or when foreign matter other than sludge 8 is mixed in the sewage. The wastewater flowing out from the tank can be effectively returned to the aeration tank C through the drop port 28. Also, to explain the case of cleaning the inside of the sludge adjustment device B, the umbrella cover 26 is slid to fit the sludge fall hole 25, and then the cleaning valve 32 is
is opened, and the pump P is driven to supply cleaning water and clean the inner surfaces of the rotary dewatering drum 2 and the outer box 11. (If you do not clean the water pump P, sewage spout nozzle part 18, rotary dewatering drum 2, and drain port 28)
Also, the water return pipe 29 becomes clogged, and the starting load on the water pump P and motor 12 increases. ) When cleaning is finished, stop the washing water, stop the water pump, close the washing valve 32, open the water pumping valve 30, and turn off the motor 12.
Turn off the switch and complete the cleaning. Although there is no problem during continuous operation, if the stop time is long, the sludge 8 will dry out, causing the sludge 8 to dry out, causing the sludge 8 to dry out on the blades of the pump P, the tip of the sewage jet nozzle 18, the inner peripheral wall of the rotary dehydration drum 2, the droplet 28, and the return pipe. If the particles adhere to the inside of the motor 12, clogging or malfunction may occur, and the starting load of the motor 12 will increase. Therefore, when the operation is suspended for a long period of time, the cleaning valve 32 is opened to clean the inside of the sludge conditioning device B before restarting the operation.

As described above, the present invention provides a rotary dehydration drum having a sewage jetting nozzle section that sucks sewage in an aeration tank and sprays the sewage into a rotary dehydration drum, a dehydration hole and a sludge discharge hole, and a rotary dehydration drum. It consists of a scraping blade that scrapes off sludge accumulated on the inner circumferential surface of the aeration tank, and a sludge storage box installed below the sludge discharge hole of the rotating dewatering drum. This makes maintenance and management of sludge adjustment easier, especially sludge adjustment for household maintenance. In particular, it has the advantage of enhancing the purification function of household human waste septic tanks and improving the quality of the effluent water.Furthermore, the sludge can be dehydrated and discharged inside the sludge conditioning device, allowing sludge treatment without manual intervention. In addition, the sewage in the aeration tank is sucked in, this sewage is sprayed into the rotating dehydration drum using the sewage jet nozzle, and water is removed from the dehydration hole provided on the ceiling of the rotating dehydration drum, so that the sludge can be dehydrated. This can be done inexpensively and in a small space, and can also be used to remove scum that floats up in the sedimentation tank.It also allows a wastewater supply pipe to be placed between the wastewater jetting nozzle that spews wastewater into the rotating dewatering drum and the aeration tank. A washing pipe for supplying washing water is connected in the middle of the wastewater supply pipe, and a water pump is installed to send the wastewater and washing water from the connection part of the wastewater supply pipe to the washing pipe to the wastewater spouting nozzle. A pumping valve that opens and closes the feed of sewage is installed on the aeration tank side from the connection part of the sewage supply pipe with the washing pipe, and a washing valve that opens and closes the feed of washing water is installed in the washing pipe, so that cleaning can be done from the washing pipe. It can supply water to clean the sewage supply pipe, sewage jet nozzle, rotating dehydration drum, etc. Furthermore, by switching between the pumping valve and the washing valve, the sewage and washing water can be sent using a common pump. Furthermore, it has the advantage that water pumps, which are most likely to malfunction due to contamination with sewage, can be easily cleaned by simply opening the cleaning valve. Furthermore, by installing a sludge concentration measuring device (detector) in the aeration tank, it becomes a septic tank that does not require sludge adjustment.

In addition, there is a partition plate disposed between the sludge discharge port and the sludge storage box, and a sludge drop hole provided in the part of the partition plate directly below the sludge discharge hole, which opens when sludge is dropped from the sludge discharge hole. It is equipped with an umbrella cover installed in the sludge fall hole and a water return pipe installed between the top surface of the partition plate and the aeration tank to return water, so that the water dehydrated in the rotating dehydration drum flows through the partition plate. Of course, the sewage that falls on top is returned to the water return pipe, but also the sewage that unexpectedly falls towards the bottom where the sludge storage box is located falls on the umbrella lid and flows from the umbrella lid to the partition plate and through the return pipe. The sludge can be returned to the aeration tank without water falling into the sludge storage box, and sludge with low water content can be collected in the sludge storage box. Moreover, the umbrella lid is shaped like an umbrella, so the sludge does not fall into the sludge storage box. The dehydrated sludge can be smoothly dropped into the sludge storage box by opening the umbrella lid.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional household human waste septic tank, Fig. 2 is a block diagram of a conventional municipal sewage sewage septic tank, Fig. 3 is a block diagram of the present invention, and Fig. 4 is an embodiment of the present invention. 5 is a longitudinal sectional view of the rotary dewatering drum portion of the same as above, FIG. 6 is a sectional view taken along the line XX shown in FIG. 5 of the same, and FIG. 2 is a perspective view showing the first to fourth embodiments, 2 is a rotating dewatering drum, 3 is a sewage supply pipe, 4 is a ceiling surface, 5 is a dewatering hole, 6 is a bottom, 7 is a sludge discharge hole, 8 is a sludge, 9 is a perspective view showing the first to fourth embodiments; 10 is a scraping blade, 10 is a sludge storage box, and C is an aeration tank.

Claims (1)

[Claims] 1 A sewage jetting nozzle part that jets and sprays sewage into the rotating dewatering drum, and a sewage jetting nozzle part and an aeration tank that sucks sewage in the aeration tank and supplies it to the sewage jetting nozzle part. A sewage supply pipe;
A cleaning pipe connected to the middle of the sewage supply pipe for supplying cleaning water, and a pump for sending sewage and cleaning water arranged on the side of the sewage spout nozzle from the connection part of the sewage supply pipe with the cleaning pipe. A pump valve that opens and closes the feed of waste water provided on the aeration tank side from the connection part between the pump and the wash pipe of the waste water supply pipe, a wash valve that opens and closes the feed of wash water provided in the wash pipe, and a dewatering hole. and a sludge discharge hole; a scraping blade for scraping off sludge accumulated on the inner peripheral surface of the rotary dehydration drum; and a sludge storage box disposed below the sludge discharge hole of the rotary dehydration drum. A partition plate is provided between the sludge discharge port and the sludge storage box, a sludge drop hole is provided in the portion of the partition plate directly below the sludge discharge hole, and a sludge drop hole is provided to open when sludge is dropped from the sludge discharge hole. An umbrella cover installed in the drop hole,
A sludge conditioning device for a septic tank, comprising a return pipe for returning water provided between the top surface of a partition plate and an aeration tank.