JPH043680Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to a quantitative advection device in a water treatment system that always advects an aeration tank mixture at a constant flow rate from a large aeration tank called an oxidation date to a settling tank. [Prior art] The amount of water to be treated that flows into water treatment equipment that processes domestic wastewater such as urban wastewater varies depending on the time of the day, with a peak in the morning and evening, a low amount in the afternoon, and a low amount at night. will be a small amount. Such differences in the amount of inflow depending on the time of day are not a problem in large-scale treatment equipment, but in small- to medium-sized treatment equipment with a daily treatment volume of 100 m ³ /day to 1000 ^{m 3} /day, sedimentation from the aeration tank is not a problem. When advecting the aeration tank mixture to the tank, there is a problem that during peak hours in the morning and evening, a large amount of the aeration tank mixture flows into the sedimentation tank at once, stirring the inside of the sedimentation tank, which reduces the sedimentation function. In order to solve this problem, conventionally, a regulating tank was provided in front of the aeration tank to adjust the supply of water to be treated. For this reason, there was a problem in that the equipment and installation area for the regulating tank were required. [Problems to be solved by the invention] The invention does not install an adjustment tank to adjust the water volume.
This system uses a small and simple structure to advect the aeration tank mixture from the aeration tank to the settling tank at a constant flow rate. [Means for solving the problem] The present invention consists of a metering tank that is installed between an aeration tank and a settling tank and into which the aeration tank mixed liquid is introduced from the aeration tank, and a metering tank that is installed upright in the metering tank and is connected to the settling tank. a siphon tube having one end suction side inserted into the liquid of the metering tank and the other end discharge side inserted into the advection tube, and a discharge port of the siphon tube that is floated on the liquid surface of the advection tube. The floating tube opens into the liquid and is connected to a float floated on the liquid surface of the quantitative tank, causing the aeration tank mixture introduced by the siphon tube to overflow and supply to the advection tube. By inserting the outflow side into a floating tube that floats according to the water level difference in the aeration tank, the water level difference between the liquid level in the aeration tank and the liquid level in the floating tank is always kept constant, and the flow from the siphon tube through the floating layer is transferred to the advection tube. This aims to eliminate the need for a regulating tank by keeping the amount of water advected per unit time constant and allowing a constant amount of water to be advected from the advection tank to the settling tank at all times. [Function] The metering tank into which the aeration tank mixed liquid is introduced from the aeration tank has the same water level as the aeration tank. Then, the aeration tank mixed liquid from the metering tank is introduced into the advection tube by a siphon tube, and the floating tube floated on this liquid is supported by the float floated on the metering tank.The suction side of the siphon tube is connected to the metering tank. The discharge side is opened to the floating tube, and the liquid overflows from the floating tube and flows into the advection tube, so as the water level in the metering tank fluctuates, the liquid level in the floating tube fluctuates at the same height, causing it to float with the metering tank. The water level difference between the tubes is always constant. Therefore, the water level difference acting on the siphon pipe is always constant, and liquid can always be advected from the metering tank to the advection tube and from the advection tube to the settling tank at a constant flow rate regardless of changes in the water level in the metering tank. . [Embodiment] An embodiment of the present invention will be described with reference to the accompanying drawings. The entire flow sheet will be explained with reference to FIG. Reference numeral 1 denotes an aeration sedimentation tank equipped with an aeration means, into which an atomic inflow pipe 2 is introduced at one end, and a coarse screen 4 is provided over an outlet 3 at the other end. Further, an outflow tank 5 from which the supernatant liquid flows out from the outflow port 3 is provided with a crusher 6, and a bypass 7 of the outflow tank 5 is provided with a fine screen 8. Reference numeral 9 denotes an oxidation date type aeration tank, which consists of an elliptical waterway into which water to be treated is introduced from the outflow tank 5 through an inflow pipe 10, the upper surface of which is sealed, and the flow path is blocked in the middle. It is separated by a partition wall 11. Furthermore, the upstream side and downstream side of the partition wall 11 are a pair of flow passages 1 dug from the bottom of the aeration tank 9.
2, and the inflow side opening 1 of this flow path 12
3 are connected to draft tube aerators 14, respectively. The draft tube aerator 14 is an aeration tank 9
A draft tube 16 having a support rod 15 having a rectifying plate 23 suspended from the upper wall and having a lower end communicating with the flow passage 12, and a draft tube 16 inserted near the upper end opening of the draft tube 16 and supported on the aeration tank 9. A rotating blade 20 whose rotating shaft 18 is connected to an electric motor 17, and a gas diffuser 2 having a large number of air diffuser holes facing downward from the rotating blade 20.
1, and a compressed air pipe 22 that communicates with the gas diffuser 21 and receives compressed air from a compressor. Reference numeral 24 denotes a metering tank with an open top and communicating with the aeration tank 9 through an inflow path 25. An advection tube 26 with an open top is installed in this metering tank 24. A siphon pipe 2 fixed with a support rod 27 and having one end suction side 28 inserted into a quantitative tank 24
9, the other end discharge side 30 is inserted. Further, the discharge port 31 of the siphon pipe 29 inserted into the advection tube 26 is opened into the water of a floating tube 32 which floats on the water surface of the advection tube 26 and has an open upper surface.
The aeration tank mixed liquid overflowing from 2 flows into the advection cylinder 26. Further, an air vent pipe 34 with an on-off valve 33 is provided at the upper end of the siphon pipe 29.
Further, an air pipe 35 is connected to the inflow side. The floating tube 32 has short tubes 3 fixed at three locations on the outer circumferential surface.
A long rod 37 is inserted through each of the short tubes 6 and 6, and nuts are screwed onto the rods 37 through washers at the top and bottom of the short tube 36, thereby fixing the rods 37 to the floating tube 32. Furthermore, an annular float 38 filled with synthetic resin foam is fitted onto the outer periphery of the advection tube 26 so as to be movable up and down, and short tubes 39 are inserted and fixed in the vertical direction into three equal parts of the plane of the float 38, respectively. ing.
A rod 40 is inserted into each of the short tubes 39 and fixed to the short tubes 39 by upper and lower washers of the short tubes 39 and nuts. And floating cylinder 32 and float 3
The eight rods 37 and 40 protrude above the quantitative tank 24 and are connected together by a connecting fitting 41. The connecting fitting 41 has a pair of short pipes 44, 45 fixed between a pair of upper and lower connecting pieces 43, 43 connected by a connecting plate 42 at an interval equal to the interval between the rods 37, 40. Insert the upper ends of the rods 37 and 40 into the short tubes 44 and 45, respectively.
The floating tube 32 is integrally connected to the float 38 by tightening the rods 37 and 40 at the top and bottom of the tube with nuts through washers. Guide pieces 47 are provided protruding from three locations on the outer periphery of the upper end of the advection cylinder 26, and a rod 40 of the float 38 is inserted halfway through a guide hole 48 of the guide piece 47. The guide piece 47 protrudes from the semicircular arc-shaped support frame 46 .
is fastened to the outer periphery of the advection tube 26 by fastening portions 49 at both ends. Reference numeral 50 denotes a settling tank, which is equipped with a sludge scraper 61, and has an advection pipe 52 led out from the lower part of the advection tube 26 introduced into its center. 53 is a sludge storage tank, and a pump 5 returns the sludge.
It is equipped with 4. 55 is an antifoaming tank that communicates with the settling tank 50 through an inflow pipe 56; 57 is a disinfection tank;
9, communicated with the defoaming tank 55 through an inflow pipe 60,
A treated water outflow pipe 61 is led out. As shown in FIG. 4, the aeration tank 9 is formed into an elongated oval shape, with flow passages left at both ends in the longitudinal direction, forming an annular waterway partitioned by a partition wall 62 in the longitudinal direction of the central length. A quantitative tank 24 and a settling tank 50 are formed by circumscribing the outflow end of the tank 9, or an elliptical annular waterway having a space 63 around the aeration tank 9 is formed as shown in FIG. , space part 63
In some cases, a quantitative tank 24, a settling tank 50, and other water treatment equipment are provided. It is also conceivable to install the advection cylinder 26 in the regulating aeration tank 9 without providing the quantitative tank 24, but there is a problem that the operation of the float 38 becomes unstable due to the water flow. Next, the operation of the above embodiment will be explained. The aeration tank 9 is connected to an aeration sedimentation tank 1 from an inflow path 10.
Coarse screen 4, fine screen 8, crusher 6
The water to be treated that has passed through is introduced. The introduced treated water is guided to the draft tube aerator 14 together with the recirculated treated water, and then to the draft tube 16.
The gas diffuser 2 is
The compressed air ejected from 1 is introduced into the draft tube 16 while being drawn in, and flows from the draft tube 16 through the flow path 12 to the opposite side of the partition wall 11 while being aerated, where it is mixed with return sludge and further aerated. The aeration tank mixed liquid that has circulated through the tank 9 is led out to the quantitative tank 24 from this outlet 25. Aeration tank 9
Since aeration is carried out near the bottom, the rise and fall of the liquid level does not affect the aeration. In the quantitative tank 24, the aeration tank mixed liquid reaches the same water level _L1 as in the aeration tank 9, and the liquid in the quantitative tank 24 is advected into the advection tube 26 by the siphon pipe 29, one end of which is inserted into the liquid in the quantitative tank 24. let At this time, siphon tube 2
Since the discharge port 31 of No. 9 opens into the floating tube 32 which is floated on the liquid level in the advection tube 26, the metering tank 24
The liquid inside once flows into the floating tube 32, overflows from the floating tube 32, and flows out to the advection tube 26. The floating tube 32 in the advection tube 26 floats on the liquid surface of the advection tube 26 and connects the rods 37, 40 and the connecting fitting 41.
It is supported by a float 38 in the quantitative tank 34 and moves up and down by the same height as the liquid level in the quantitative tank 24 rises and falls. Therefore, in FIG. 2, when the water level of the quantitative tank 24 changes from L ₁ to L ₁ ', the floating tube 32
The water level changes from L ₂ to L ₂ ′, but L ₁ −L ₂ = l,
If L ₂ −L ₂ ′=l′, then l=l′, and even if the water level in the quantitative tank 24 changes, the difference in water level between the quantitative tank 24 and the floating tube is always the same. Therefore, the water level difference in the siphon pipe 29 does not change due to the vertical movement of the water surface, and the water level difference in the siphon pipe 29 does not change due to the vertical movement of the water surface.
The advection speed of the aeration tank mixture according to 9 is always constant regardless of fluctuations in the water level _L1 . Therefore, even if the amount of raw water flowing in changes depending on the time of day and the water level in the aeration tank 9 changes, the advection speed of the liquid through the siphon pipe 29 is always constant, and a large amount of the mixed liquid in the aeration tank can flow at once. There is no advection of liquid from the advection tube 52 to the settling tank 50, and the settling tank 52 is not agitated by the advected liquid. Further, when the air inside the siphon pipe 29 is to be removed when starting the siphon pipe 29, the air vent pipe 34 is connected to a vacuum pump or the like, and the on-off valve 33 is opened to remove the air. The aeration tank mixed liquid advected to the settling tank 50 as described above is separated from the sludge in the settling tank 50, and is further discharged into the river via the defoaming tank 55 and the disinfection tank 57. The sludge is collected by a scraper 51 and sent to the sludge tank 5.
A portion from 3 is returned to the aeration tank 9, and the rest is concentrated and transported. The quality of the treated water discharged is as follows.

[Effect of idea]

According to the present invention, a quantitative tank is provided between the aeration tank and the settling tank and into which the aeration tank mixture is introduced from the aeration tank;
an advection cylinder installed upright in the quantitative tank and communicated with the settling tank; a siphon pipe with one end of the suction side inserted into the liquid of the quantitative tank and the other end of the discharge side inserted into the advection cylinder; and the advection cylinder. The aeration tank mixture is connected to the float floated to the liquid surface of the quantitative tank, and the aeration tank mixture introduced by the siphon pipe is caused to overflow and advection. The siphon tube inserted into the advection tube from the liquid in the metering tank is
The discharge port is floated on the suction surface of the advection cylinder and opened into the liquid in the floating cylinder supported by a float floated on the quantitative tank, and the liquid level in the quantitative tank is raised by the amount of liquid flowing into the quantitative tank. Even when vertical fluctuations occur, the water level difference between the liquid level in the metering tank and the liquid level in the floating cylinder can always be kept constant. Therefore, the water level difference in the siphon pipe can be kept constant regardless of fluctuations in the liquid level in the aeration tank, and the flow rate of the aeration tank mixed liquid advected from the advection tube to the settling tank can be kept constant at all times. For this reason, in water treatment equipment for domestic wastewater, where the amount of discharge varies widely depending on the time of day, a large amount of the aeration tank mixed liquid that advects from the aeration tank to the sedimentation tank may be discharged at once and agitate the sedimentation tank. The precipitation efficiency can be improved without any problems. Furthermore, the metering tank does not need to store a large amount of water to be treated compared to a conventional regulating tank, and only needs to be equipped with a siphon pipe, so the installation area of the entire water treatment device can be reduced.

[Brief explanation of drawings]

Fig. 1 is a flow sheet of a water treatment device showing an embodiment of the present invention, Fig. 2 is a vertical cross-sectional side view of the quantitative tank as above, Fig. 3 is a plan view of the same as above, Fig. 4 is a plan view of the aeration tank as above; FIG. 5 is a plan view showing another embodiment of the aeration tank. 9... Aeration tank, 24... Quantitative tank, 26... Advection tube, 29... Siphon pipe, 32... Floating tube, 38
... Float, 50 ... Sedimentation tank.

Claims (1)

[Scope of utility model registration request] A metering tank provided between the aeration tank and the settling tank and into which the aeration tank mixed liquid is introduced from the aeration tank, an advection tube installed upright in the metering tank and communicating with the settling tank, and one end of the suction side connected to the metering tank. A siphon tube is inserted into the liquid and the other end discharge side is inserted into the advection tube, and the siphon tube is floated on the liquid surface of the advection tube to open the discharge port of the siphon tube into the liquid and the other end is inserted into the liquid surface of the quantitative tank. 1. A quantitative advection device for a water treatment equipment, comprising a floating tube connected to a float that floats and causes the aeration tank mixture introduced by the siphon tube to overflow and supply to the advection tube.