JPH0453562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improved upflow device.

Specifically, the present invention provides an upward flow method in which suspended solids in the water to be treated are removed by passing the water to be treated in an upward flow through a filter column filled with a material that floats on water. In the filtration equipment, suspended solids attached to the materials are separated from the materials by circulating the materials after passing through the tower from the suction inlet of the ejector installed outside the tower to the bottom of the tower, making it possible to easily remove suspended solids. The present invention relates to an upward flow device that can be used.

<Prior Art> In recent years, an upward flow filtration device has been developed as a filtration device for removing turbidity from feed water such as cooling tower circulating water, water pressure testing water, fish farming water, and the like.

This upward flow filtration device has the ability to capture a larger amount of suspended solids than the downward flow filtration device.

However, since the specific gravity of the material in the upward flow device is higher than that of water, it is difficult to increase the flow rate of the water to be treated.
Alternatively, there is a problem in that as the suspended matter is trapped in the superlayer, the superlayer flows, making it impossible to trap the suspended matter.

Therefore, in order to prevent such fluidization, a method is known in which a material with a specific gravity smaller than that of water is used to form a floating layer in the filter tower, and the water to be treated is passed through in an upward flow. There is.

However, in an upward flow filtration device that uses this floating material, when cleaning the overlayer that has been contaminated by trapping suspended matter in the water to be treated, the cleaning water is pumped from the bottom of the overlayer, which is conventionally done. A special operation is required because the so-called backwashing operation, in which water is passed at a high flow rate to fluidize and wash the superlayer, cannot be used.

For example, a stirrer is installed in the filter tower, which stirs the superlayer of the filter tower together with the retained water, fluidizes the superlayer, disperses the turbidity in the overlayer into the retained water, causes it to settle, and then A method is adopted in which the water is discharged to the outside of the tower along with the retained water.

<Problems to be Solved by the Invention> However, in the above method, it is necessary to fluidize the entire flotation layer, which requires the installation of a stirring device with a relatively large power capacity. There were problems in that the structure was complicated, the materials wore out, and the equipment cost increased.

The present invention is an upward flow filtration device in which the overlayer is made of a material that floats on water, which does not require an agitation device for cleaning the overlayer, and can be applied to the overlayer without abrasion of the material by simple piping connections. The purpose of the present invention is to provide an upward flow filtration device capable of cleaning.

<Means for Solving the Problems> That is, the present invention provides a filter tower 1 filled with a material that floats on water as an overlayer 7, a drainage nozzle 4 at the bottom of the filter tower, and a water spray nozzle above the drainage nozzle. 2, a material return nozzle 3 is installed above the water spray nozzle, a water collection nozzle 5 is installed above the water collection nozzle, a material extraction nozzle 6 is installed above the water collection nozzle, and the material extraction nozzle is It is connected to the suction inlet of the ejector 9 outside the tower, the outlet of the ejector is connected to the material return nozzle 3, and the driving water inlet of the ejector and the water nozzle are connected to the discharge port switching three-way valve 1.
1, the remaining one of the three-way valves is connected to the outlet of the circulation pump 8, the inlet of the circulation pump is connected to one side of the suction port switching three-way valve 10, and one side of the suction port switching three-way valve 10 is connected to the outlet of the circulation pump 8. The remaining one of the suction port switching three-way valves is connected to the water supply pipe 12, and the remaining one is connected to the water spray nozzle via one of the discharge port switching three-way valves, filling the space between the material return nozzle and the material extraction nozzle with an appropriate amount of material. The gist of the present invention is an upward flow device characterized by:

The present invention is designed to extract the floating overlayer from the top of the overcoat using the suction force of the ejector and return it to the lower part of the overcoat together with the driving water of the ejector (the exit of ejector 9 and the material return By passing water through the circulation pipe installed between the nozzle 3), the superlayer is fluidized, and the material particles collide with each other or against the pipe wall in the circulation pipe, thereby removing suspended matter. The superlayer can be washed by separating the suspended solids and material from the filter by sedimentation and flotation in the filter tower.

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

FIG. 1 is a flow sheet showing the upward flow device of the present invention.

The main components of this upward flow filtration device include a filter column 1 and a circulation pump 8 connected to the column via piping.

The filter tower 1 is a closed tank, and a drainage nozzle 4, a water sprinkling nozzle 2, and a material return nozzle 3 are installed in this order from the bottom in the lower part, and a material extraction nozzle 6 and a water collection nozzle 5 are installed in this order in the upper part from the top. The interior is filled with a material that floats on water,
A superlayer 7 is configured.

As the material that floats on water, materials with a specific gravity of 1 or less and a particle size of about 0.5 to 1.0 mm, such as expanded polystyrene, expanded polyethylene, and polyethylene beads, can be used.

In addition, the filling amount of material is 300~
The length should be approximately 1000 mm, and may be changed depending on the amount of suspended solids in the water to be treated.

A suction port switching three-way valve 10 and a discharge port switching three-way valve 11 are connected via piping to the circulation pump 8 on the suction port side and the discharge port side, respectively. A water supply pipe 12 to be treated is connected to one of the former connection ports, and a water sprinkling nozzle 2 is connected to the other connection port via one of the three-way discharge port switching valves. Furthermore, a driving water inlet of the ejector 9 is connected to one of the latter connection ports, and a water spray nozzle 2 is connected to the other connection port. Further, the suction inlet of the ejector 9 is connected to the material extraction nozzle 6, and the ejector 9
The outlet is connected to the material return nozzle 3 via a material circulation pipe 14.

The circulation pump 8 and the three-way switching valves 10 and 11 employed in the present invention are not special, and may be those used in conventional water treatment equipment.

Further, the ejector 9 may be of any type as long as it can extract the material in a slurry state.

It is preferable that the material extraction nozzle 6 has a radial tube structure so that the material can be extracted uniformly.

Now, the process of passing through the water to be treated containing suspended solids is carried out as follows.

The treated water introduced through the treated water supply pipe 12 passes through the suction port switching three-way valve 10, the circulation pump 8, and the discharge port switching three-way valve 11, and then enters the filter tower 1 through the water spray nozzle 2 at the bottom of the filter tower 1. Supplied.

The treated water supplied to the filter tower 1 passes through the filter layer 7 in an upward flow, passes through the water collecting nozzle 5, and flows out from the treated water outlet pipe 13 through the valve 16 as treated water. The flow rate of water to the filter tower 1 is 30 to 60 m/
Use H as a guide.

After the water passage process has been carried out for a predetermined period of time, or when the overlayer 7 is contaminated by trapped suspended matter and a certain pressure loss occurs, the water passage process is stopped.

Next, a washing step is performed to wash the overlayer 7, and the suspended solids captured and accumulated in the overlayer 7 in the water passage step are discharged to the outside of the overlayer 1.

That is, when the flow paths of the suction port switching three-way valve 10 and the discharge port switching three-way valve 11 connected to the circulation pump 8 are switched to a predetermined flow path for performing the cleaning process,
The retained water remaining in the lower part of the filter tower 1 is sucked by the circulation pump 8 through the water spray nozzle 2 and the suction port switching three-way valve 10, and is used as driving water for the ejector 9 via the discharge port switching three-way valve 11.

By driving the ejector 9, the overlayer 7 in the filtration column 1 is gradually extracted from the material extraction nozzle 6 at the top of the filtration column 1 along with the accumulated turbidity, and becomes a slurry state together with the driving water, which flows through the material circulation piping 14. The material passes through and is returned to the filtration tower 1 through the material return nozzle 3 at the bottom of the filtration tower.

The material returned to the filter tower 1 rises due to buoyancy and circulates through this system again. During this time, the material collides with each other or the pipe wall, and the suspended solids are separated and the material is washed.

The circulation time of the material depends on the degree of contamination of the material.
Generally, you should aim for 10 to 30 minutes.

After the material has been sufficiently circulated and the material has been cleaned,
The circulation is stopped, and the material is allowed to stand still in order to settle the structure of the flotation layer 7 and the separated suspended solids to the lower part of the filtration tower 1. This standing time may be about 1 to 5 minutes.

After the overlayer is allowed to stand still, the overlayer drain valve 17 is opened, and the settled turbidity is discharged together with the retained water through the drainage nozzle 4 and the discharge pipe 15, thereby completing the cleaning process of the overlayer 7.

Several branch pipes are attached to the drainage nozzle 4 so that the settled suspended solids can be discharged as widely as possible, and the discharge pipe 15 is equipped with a sprinkler nozzle 2 to prevent the material from flowing out of the tower. It is best to raise it to the desired height.

Next, after switching the suction port switching three-way valve 10 and the discharge port switching three-way valve 11 to the same flow path as in the water passage process, if necessary, the suspended matter remaining in the overlayer 7 is washed with water to be treated. Washing water is treated water outflow pipe 13
After the water is discharged from the drain pipe 15 through the more branched valve 18, the water flow process is performed again.

In the present invention, operation and stopping of the circulation pump 8, opening and closing of the switching three-way valves 10, 11 and the valves 16, 17, 18,
The switching may be done manually, but it can also be done automatically by a certain program using a timer, computer, or the like.

<Effects of the Invention> According to the upward flow filtration device of the present invention, the property of the material floating on water is skillfully utilized to flow and circulate the material within the piping path, thereby causing accumulation in an overlayer or the surface of the material. The suspended solids attached to the can be removed and washed with a very small amount of water. In addition, a circulation pump for supplying water to be treated can be used as a power source for overlayer cleaning, and there is no need for an agitation device or special equipment, which not only reduces equipment costs but also takes up less equipment installation space. It also has the feature of avoiding wear of the material.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a flow sheet showing an upward flow device according to an embodiment of the present invention. 1... Over tower, 2... Water spray nozzle, 3... Material return nozzle, 4... Drainage nozzle, 5... Water collection nozzle, 6... Material extraction nozzle, 7... Overlayer, 8...
...Circulation pump, 9...Ejector, 10...Suction port switching three-way valve, 11...Discharge port switching three-way valve, 12
...Water supply piping to be treated, 13...Treated water outflow piping, 14...Material circulation piping, 15...Drainage piping,
16... Valve, 17... Over tower drain valve, 18...
valve.

Claims (1)

[Claims] 1 A overcoat 1 filled with material that floats on water as an overlayer 7, a drainage nozzle 4 at the bottom of the overcoat, a water spray nozzle 2 above the drainage nozzle, and
A material return nozzle 3 is installed above the water spray nozzle, a water collection nozzle 5 is installed above the tower, and
A material extraction nozzle 6 is installed above the water collection nozzle, and the material extraction nozzle is connected to the suction inlet of the ejector 9 outside the tower, and the outlet of the ejector is connected to the material return nozzle 3, which is connected to the driving water inlet of the ejector and the water sprinkling nozzle. The nozzle is connected to two sides of the discharge port switching three-way valve 11, the remaining three-way valve is connected to the outlet of the circulation pump 8, the inlet of the circulation pump is connected to one side of the suction port switching three-way valve 10, and the suction port One side of the three-way switching valve is connected to the water supply pipe 12 to be treated, and the remaining one of the three-way switching valves for the suction port is connected to the watering nozzle via one side of the three-way switching valve for the discharge port, and the material return nozzle and the material extraction nozzle are connected to each other. An upward flow device characterized in that a space is filled with an appropriate amount of material.