JPS6341053Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an inclined plate sedimentation device used for water supply treatment, etc., and in particular, an inclined plate sedimentation device that can air clean the inclined plate portion without stopping water flow. Regarding.

[Prior Art] Conventionally, an inclined plate sedimentation device that purifies contaminants in water by settling it on an inclined plate surface while water is flowing through the device is known as a technology for waterworks and the like. There are two types of inclined plate sedimentation devices, an upward flow type and a horizontal flow type, depending on the method of passing water through the device.
The basic principle is the same.

FIG. 5 is a schematic configuration diagram showing a general example of a conventional inclined plate sedimentation device. In FIG. 5, the inclined plate sedimentation device has a preparation tank 1, a sedimentation tank 2, an outflow tank 3, and a treated water system 4 arranged in the above order,
An inclined plate portion 21 is disposed within the sedimentation tank 2. The water led from the preparation tank 1 to the sedimentation tank 2 settles the mixed substances at the inclined plate part 21, and then flows into the outflow tank 3.
It overflows to. A trough (collection pipe) 31, such as a pipe with perforations, is installed above the outflow tank 3 to allow the supernatant of the stored water to flow in. When the inflow level reaches , the supernatant water is collected.
One end of this trough 31 is opened to the adjacent treated water system 4, and the clarified treated water is sent to the next stage. Note that a flocculator 11 is installed in the preparation tank 1.

As shown in the plan view of FIG. 6, the above-mentioned inclined plate sedimentation device is usually installed in three or two units,
Usually, the preparation tank 1 and the treatment waterway 4 are constructed as a common part.

[Problems to be solved by the present invention] In the above-mentioned inclined plate sedimentation device, the inclined plate part of the settling tank needs to be cleaned periodically, but in such a case, if cleaning is carried out with water flowing through it, Since sewage overflows into the treated water system and contaminates the treated water, conventionally one of the multiple units was cleaned by shutting off the water, and the cleaning work was then carried out one by one. However, when working with the water supply stopped, one of the machines must be out of operation for at least an hour, and during that time, for example, in the case of Figure 6, two machines will be required to process the work done by three machines, leaving the rest. Regarding these two units, there were problems in that the processing conditions, flow rate, pressure, etc. changed, which not only adversely affected the treated water but also made it impossible to completely prevent the overflow of sewage. The object of the present invention is to solve these problems and provide an inclined plate sedimentation device that can carry out cleaning work while passing water at the same flow rate, and does not allow washed wastewater to flow into the treated water system.

[Means for solving the problems] In the present invention, the measures taken to solve the above problems include a settling tank that purifies contaminants in flowing water by settling them on an inclined plate surface, and a settling tank. In an inclined plate sedimentation device comprising an outflow tank into which treated water flows, and a trough (water collection pipe) that collects the supernatant water of the outflow tank and discharges it to the treated water system, the flow from the trough to the treated water system is a weir that partially partitions the water outlet of the trough, a drainage system that is installed at a low position in the trough and has an allowable flow rate to keep the water surface height in the trough below the weir height, and a drainage system valve that connects or shuts off the drainage system. An inclined plate sedimentation device characterized by comprising:

The sedimentation tank, outflow tank, and inclined plate part of the above equipment are as follows:
Generally known ones are used. The trough itself
A well-known type, whether it is a perforated pipe type or a gutter type, can be used, but a weir is provided at the water outlet to the treated water system, and it is opened at a position lower than the height of the weir.
A drainage system with a valve is installed.

[Function] If a weir is installed in the trough and a very large-capacity drainage system is connected to a position lower than the height of the weir, as long as the drainage system is open, the treated water collected in the trough will be , the entire amount flows into the drainage system without overflowing over the weir into the treatment waterway. Therefore, in a trough with this structure, the overflow of sewage can be prevented by opening the drainage system during cleaning, and normally, when the drainage system is closed, the treated water flows over the weir to the treated water system.

[Examples] Hereinafter, the present invention will be described in detail with reference to examples and the drawings.

FIG. 1 is a schematic diagram showing an example of an inclined plate sedimentation device embodying the present invention. In Figure 1,
The inclined plate sedimentation device has a preparation tank 1, a settling tank 2, an outflow tank 3, and a treated water system 4 arranged in parallel in the above order, as in the conventional case.
is installed. The water flows through the sloping plate portion 21 to cause contaminants to settle therein, and then overflows into the outflow tank 3. A trough (water collection pipe) is located above the outflow tank 3.
31 is installed, and when the water level of the treated water overflowing from the settling tank 2 rises to the perforation of the trough 3, the supernatant of the treated water flows into the trough 31 through the perforation and is collected. One end of the trough 31 is opened to the adjacent treated water system 4,
A weir 5 is provided at the opening end, and approximately half of the opening end surface is partitioned off, and the treated water collected in the trough 3 will not flow into the treated water system 4 unless the water rises to exceed the weir height. Can not. On the other hand, a through hole is bored in the body or bottom of the trough 31 at a position lower than the weir height, and a tubular drainage system 6 is attached thereto. The permissible flow rate of this hole and drainage system is designed to be larger than the amount of treated water collected into the trough 31. A drainage system valve 61 is interposed at a desired location of the drainage system 6, and when the valve is opened, the drainage system 6 is conducted, and when the valve is closed, the drainage system 6 is cut off.

FIG. 2 is a partial structural diagram showing in detail an example of the trough 31 and weir 5 in which the present invention is implemented.
Reference numeral 1 has a tube shape, and has an inflow window 31a for treated water, a weir 5 provided at the outlet to the treated water system, and a drainage system 6 attached to the bottom. When the water surface S of the treated water stored in the outflow tank 3 reaches the inflow window 31a, the supernatant begins to flow into the trough 31. During normal operation, the drainage system valve 61 provided in the drainage system 6 is closed, so treated water does not flow into the drainage system 6, and the water surface S' in the trough 31 eventually exceeds the weir height H. The treated water then overflows into the treated water system. During the cleaning operation, the water flow is not stopped, and the known air cleaning means B (FIG. 1) is operated, however, the drainage system valve 61 is opened. Since the water flow is the same as normal, the treated water mixed with cleaning wastewater flows through the inlet window 31.
a flows into the trough 31, but the amount flowing out to the drainage system 6 is larger than that amount, so the trough 3
The water surface height of No. 1 will never exceed the weir height, and sewage will not overflow into the treated water system. Finally, when the cleaning is completed, the air cleaning means is stopped, and the treated water in the outflow tank becomes clear, the drainage system valve is closed and normal operation is resumed.

FIG. 3 is a partial structural diagram showing an example of a trough to which the present invention is applied, and the trough 31 has a two-tiered structure from top to bottom. The end face of the upper stage is open to the treated water system, but the end face of the lower stage is closed by a weir wall 5.
Inflow windows are provided in the upper and lower stages, and the lower inflow window 31b is much larger than the upper inflow window 31a, and is designed to allow treated water to flow freely. During normal operation, the drainage system 6 is closed, so the treated water that flows into the lower stage remains in the trough, and only the supernatant that flows into the upper stage flows into the treated water system. Since the valve of the system 6 is opened, when the water surface S of the settling tank reaches the lower inflow window 31b, drainage is fully performed, and sewage does not flow into the treated water system. Note that the upper and lower stages of this trough 31 do not necessarily have to be partitioned by a partition wall, but if they are partitioned by a partition wall, the above effect will be achieved perfectly. A unique effect of the trough of this embodiment is that the lower inlet window 31b can be freely enlarged, so that water can be drained at high speed and in a short time during cleaning.

FIG. 4 is a block diagram showing yet another example of implementing the present invention, in which a drainage system 6 is attached to the bottom of the trough 31 and the siphon principle is applied to the drainage system 6. The initial movement of drainage is provided by the vacuum valve 62, which has the advantage that the initial movement of drainage and the water surface height in the trough 31 can be controlled from a remote location.

[Effects of the invention] As explained above, according to the invention, cleaning work can be carried out while water is flowing without changing the flow rate, and the sloping plate sedimentation prevents cleaning wastewater from flowing into the treated water system. equipment can be provided.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of one embodiment of the present invention;
3 and 3 are partial configuration diagrams of each example of a trough according to the present invention, FIG. 4 is a configuration diagram of another embodiment of the present invention, and FIGS. 5 and 6 are a schematic configuration diagram and a plan view of a conventional example. It is a diagram. 2... Sedimentation tank, 21... Inclined plate part, 3... Outflow tank, 31... Trough, 31a, 31b... Inflow window, 4... Treated water system, 5... Weir, 6... Drainage system,
61... Drainage system valve.

Claims (1)

[Scope of utility model registration request] A sedimentation tank that purifies contaminants in flowing water by settling them on the inclined plate surface, an outflow tank into which the treated water processed in the sedimentation tank flows, and the supernatant water of the outflow tank is collected and discharged to the treated water system. In an inclined plate sedimentation device comprising a trough (water collection pipe), a weir partially partitions the water outlet from the trough to the treated water system, and a weir is installed at a low position of the trough to keep the water surface height in the trough below the weir height. What is claimed is: 1. An inclined plate sedimentation device comprising: a drainage system having an allowable flow rate suppressed to 100%, and a drainage system valve that conducts or shuts off the drainage system.