JPH01262909A - Up-flow filter apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improved upflow filtration device.

Specifically, the present invention provides an upward flow system 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 filtration tower filled with a furnace material that floats on water. In the filtration device, the turbidity adhered to the furnace material is separated from the furnace material by circulating the furnace material after passing water through the suction inlet of the ejector installed outside the tower to the bottom of the tower. The present invention relates to an upflow filter device that can be easily removed.

<Prior Art> In recent years, an upflow filtration device has been developed as a ν 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, in upflow filtration devices, the specific gravity of the furnace material is higher than that of water, so the flow rate of the water to be treated must be increased, or the filtration layer may flow as turbidity is captured within the filtration layer. ,
There was a problem that suspended solids could not be captured.

Therefore, in order to prevent such fluidization, a floating filtration layer is constructed in the filtration tower using a furnace material with a specific gravity smaller than that of water.
A method is known in which water to be treated is filtered by passing it in an upward flow.

However, in an upflow filtration device using this floating furnace material, when cleaning the filtration layer that has been contaminated by trapping suspended matter in the water to be treated, it is difficult to clean the filtration layer from the bottom of the filtration layer, which is the conventional method. A special operation is required because a so-called backwash operation in which washing water is passed through at a high flow rate to fluidize and wash the filtration layer cannot be used.

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

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

The present invention is an upflow filtration device in which a filtration layer is formed by a furnace material floating on water, which does not require an agitation device for cleaning the filtration layer and can be easily connected to piping without causing wear on the furnace material. The object of the present invention is to provide an upflow filtration device that can wash a filtration layer.

<Means for Solving the Problems> In other words, the present invention provides a method in which the filter material floating on water is a filter layer (7).
A filtration tower (1) filled with water, a drainage nozzle (4) at the bottom of the filtration tower, and a water spray nozzle (2) above the drainage nozzle.
), and a filter medium return nozzle (3) above the water spray nozzle.
is installed, a water collection nozzle (5) is installed above the filtration tower, a filter material extraction nozzle (6) is installed above the water collection nozzle, and the furnace material extraction nozzle is connected to the ejector (9) outside the tower. connected to the suction inlet of.

The outlet of the ejector is connected to the filter medium return nozzle (3),
The driving water inlet of the ejector and the water spray nozzle are connected to three sides of a three-way discharge port switching valve (6), the remaining one of the three-way valves is connected to the outlet of a circulation pump (8), and the inlet of the circulation pump is connected to a suction port switching valve. One of the suction port switching three-way valves is connected to one of the three-way valves (7), one of the suction port switching three-way valves is connected to the treated water supply pipe (2), and the remaining one of the suction port switching three-way valves is connected to one side of the discharge port switching three-way valve. The gist of the present invention is an upflow filtration device which is connected to a water spray nozzle and is characterized in that a space between a furnace material return nozzle and a filter material extraction nozzle is filled with an appropriate amount of filter material.

The present invention extracts the floating filtration layer from the top of the filtration tower using the suction force of the ejector.
By passing water through a circulation pipe designed to be returned to the lower part of the filtration tower together with the driving water of the filter (installed between the outlet of the ejector (9) and the filter medium return nozzle (3)), By fluidizing the furnace material and causing the furnace material particles to collide with each other or the pipe wall in the circulation pipe, the suspended solids are separated from the furnace material, and the separated suspended solids and the filter medium are allowed to settle and settle in the filter tower.
The filtration layer can be washed by flotation separation.

<Example> An embodiment of the present invention will be described below based on the drawings.

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

This upward flow lacrimal filtration device has a filtration tower (1) and a circulation pump (8) connected to the filtration tower (1) as main components.

The filtration tower (1) is a closed tank with a drainage nozzle (4), a watering nozzle (2) and a furnace material return nozzle (3) at the bottom.
In this order, the furnace material extraction nozzle (
6) and a water collection nozzle (5) are installed in this order, and the inside is filled with a furnace material that floats on water, and a filtration layer (
7) is configured.

The furnace material that floats on this water has a specific gravity of 1 or less and a particle size of O0.
For example, foamed polystyrene, foamed polyethylene, polyethylene peas, etc. can be used.

In addition, the filling amount of the furnace material is such that the height of the filtration layer (7) is 3QO~i,
ooo, and may be changed according to the amount of suspended solids in the water to be treated.

A suction port switching three-way valve αQ and a discharge port switching three-way valve αη are connected via piping to the circulation pump (8) on the suction port side and the discharge port side, respectively. A water supply pipe (2) to be treated is connected to one of the former connection ports, and the other connection port is connected to the water supply pipe (2).
A water spray nozzle (2) is connected via piping through 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 filter material extraction nozzle (6), and the outlet of the ejector (9) is connected to the furnace material return nozzle (3) via the filter material circulation pipe α→.

The circulation pump (8) and each switching three-way valve (
) and αη 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 filter material in a slurry state.

The furnace material extraction nozzle (6) may have a radial branch pipe structure so that the filter material can be extracted uniformly.

Now, the water passing step for filtering the water to be treated containing suspended solids is carried out as follows.

The treated water introduced through the treated water supply pipe (2) passes through the suction port switching three-way valve αQ, the circulation pump (8) and the discharge port switching three-way valve αυ, and is then delivered to the water spray nozzle at the bottom of the filtration tower (1). (2) It is fed to the sifting tower (1).

The water to be treated that is supplied to the filtration tower (1) passes through the filtration layer (7) in an upward flow and is filtered, then passes through the water collection nozzle (5) and is discharged as treated water from the treated water outflow pipe (to) the valve. It flows out through (g). The flow rate of water to the filtration tower (1) is 30 to 40 m/h
Use this as a guideline.

When the water passage process has been carried out for a predetermined period of time, or when the filtration layer (7) is contaminated by the trapped turbidity and a certain pressure loss is reached, the water passage process is stopped.

Next, a washing process is performed to wash the filtration layer (7), and the suspended solids captured and accumulated in the filtration layer (7) during the water flow process are transferred to the filtration tower (1).
Discharge outside.

That is, when the flow paths of the suction port switching three-way valve 00 and the discharge port switching three-way valve (b) connected via piping to the circulation pump (8) are switched to a predetermined flow path for performing the cleaning process, the lower part of the filtration tower (1) The remaining water is sucked by the circulation pump (8) through the water spray nozzle (2) and the suction port switching three-way valve a4, and is used as driving water for the ejector (9) via the discharge port switching three-way valve αη.

By driving the ejector (9), the filtration layer (7) in the filtration tower (1) is gradually extracted from the furnace material extraction nozzle (6) at the top of the filtration tower (1) together with the accumulated turbidity. Together with the driving water, it becomes a slurry, passes through the F material circulation pipe α→, and is returned to the filtration tower (
1).

The furnace material returned to the filtration tower (1) rises due to buoyancy and circulates through this thread path again. During this time, the filter material particles collide with each other or the piping wall, and the suspended solids are separated and the furnace material is Washed.

The circulation time of the furnace material depends on the degree of contamination of the filter material, but is usually 10
Aim for ~30 minutes.

After the furnace material has been sufficiently circulated and the furnace material has been cleaned, the circulation is stopped and the furnace material is removed to form the floating filtration layer (7) and to settle the separated suspended solids at the bottom of the filtration tower (1). Leave it still. This standing time may be about 7 to j minutes.

After standing still, open the filter tower drain valve αη and drain the drain nozzle (4),
The cleaning step of the filter layer (7) is completed by discharging the settled suspended solids together with the retained water through the discharge pipe αQ.

Several branch pipes are attached to the drainage nozzle (4) so that the settled turbidity can be discharged as widely as possible, and the discharge pipe (T) is installed to prevent the furnace material from flowing out of the filtration tower. It is best to raise it to the height of the installation position of the water spray nozzle (2).

Next, after switching the suction port switching three-way valve αQ and the discharge port switching three-way valve (b) to the same flow path as the water passage process, if necessary, the suspended matter remaining in the filter layer (7) with the water to be treated is is washed with water, and the washing wastewater is sent to a valve branched from the treated water outflow pipe a3 (to).
After the water is discharged from the drainage pipe αυ, the water flow process is performed again.

In the present invention, the operation, stopping, and switching of the three-way valves αQ, αυ, valves (G), αη, and (G) of the circulation pump (8) may be performed manually, but a timer, computer, etc. may be used. This can also be done automatically using a certain program.

<Effects of the Invention> According to the upward flow filtration device of the present invention, the property of the furnace material to float on water is skillfully utilized to fluidize and circulate the furnace material within the piping path, thereby preventing accumulation or accumulation in the filter layer. Suspended matter adhering to the surface of the filter medium 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 filter layer 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 advantage of avoiding wear of the furnace material.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a flow sheet showing an upward flow filtration device according to an embodiment of the present invention. l...filtration tower 2...water nozzle 3-...
ν Material return nozzle ≠...Drainage nozzle j...Water collection nozzle 6...Furnace material extraction nozzle 7...Filtration layer
r...Circulation pump...Ejector-10...
・Suction switching three-way valve //00. Discharge flow switching three-way valve 12
...Treated water supply piping/3...Treated water outflow piping/
4t...Furnace material circulation piping/j...Drainage piping lt
...Valve/7...Filtering tower drain valve IR...Non-applicant Nippon Rensui Co., Ltd. Representative Patent attorney Hase - 1 other person

Claims (1)

[Claims] (1) A filtration tower (1) filled with filter media that floats on water as a filtration layer (7), and a drainage nozzle (4) at the bottom of the filtration tower.
), a water spray nozzle (2) is installed above the drainage nozzle, a filter medium return nozzle (3) is installed above the water spray nozzle, and a water collection nozzle (5) is installed above the filtration tower; A filter medium extraction nozzle (6) is installed above, the filter medium extraction nozzle is connected to the suction inlet of the ejector (9) outside the column, the outlet of the ejector is connected to the filter medium return nozzle (3), and the drive water inlet of the ejector and a water spray nozzle are connected to two sides of a three-way discharge port switching valve (11), the remaining three-way valve is connected to the outlet of a circulation pump (8), and the inlet of the circulation pump is connected to a three-way suction port switching valve (10). One of the suction port switching three-way valves is connected to the treated water supply pipe (12), and the remaining one of the suction port switching three-way valves is connected to the water sprinkling nozzle via one of the discharge port switching three-way valves. , an upflow filtration device characterized in that a space between a filter medium return nozzle and a filter medium extraction nozzle is filled with an appropriate amount of filter medium.