JPS5922562B2 - Internal pressure tubular type reverse osmosis membrane cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an apparatus for cleaning an internal pressure tubular type reverse osmosis membrane, which is used for advanced treatment of wastewater, using a fluid containing sponge balls.

Internal pressure tubular reverse osmosis equipment, which is used for advanced treatment of wastewater, uses a high-pressure pump to pressurize wastewater into an internal pressure tubular reverse osmosis membrane installed inside a tubular body, and separates the permeated water from the reverse osmosis membrane. The wastewater is separated from the concentrated water that passes through the tubular body.

When wastewater is treated for a long time using the above reverse osmosis equipment,
Dirt adheres to the membrane surface inside the pipe, reducing the performance of the reverse osmosis membrane. To remove this, a large number of flexible balls made of sponge rubber, etc. are flowed into the pipe together with cleaning water to clean the membrane surface. A cleaning device has been developed.

An example of such a cleaning device is shown in FIG.

This device includes a tubular module 8 into which the liquid to be treated is introduced through a distribution device 16, a ball collector 9 provided at the rear of the tubular module, and a ball collector 9 that collects the balls collected by the collector. A ball collector 10 that includes a ball storage tank 11 connected to the ball collector 10, a piping system for introducing the balls stored in the ball storage tank 11 to the distribution device, a tubular module 8, and a ball collector. 9 and a pressure regulating valve 12 for the fluid after passing through the fluid.

In the figure, 1, 2, 3, 4, 5, 6, and 7 indicate valves that connect the piping system and the constituent parts.

Further, a reverse osmosis membrane is installed in each tube of the tubular module via a support, and the passing liquid is concentrated.

During normal operation (non-cleaning), the water to be treated is pressurized by the pump and flows into the reverse osmosis module 8 through the valve 1 while the pressure is adjusted by the pressure regulating valve 12.
The concentrated liquid passes through the collector 9 and is discharged to the outside of the system.

At this time, valves 2, 3, 4, 5, 6, and 7 are closed.

Next, during cleaning, valve 1 is closed, valves 2 and 3 are opened, and the water to be treated is introduced into the ball storage tank 11, the balls are brought along with the water to be treated, and the water is supplied into the module 8 to clean the membrane surface.

The ball-containing water to be treated that comes out of the module 8 enters the collector 9, and the water from which the balls have been separated is discharged to the outside of the system.

Next, valves 2 and 3 are closed, valves 1 and 4.7 are opened to introduce the water to be treated, and a part of this water is used as carrier water to transport the balls to the collector 10, where the carrier water is separated. The balls are then discharged through valve 7, while the balls are returned to ball storage tank 11.

In the conventional apparatus described above, during cleaning, part of the water to be treated is used as carrier water for the balls via the ball collector, and the other water to be treated is discharged to the outside through the pressure regulating valve.

On the other hand, since it is necessary to effectively treat the amount of water to be treated, it is desirable that the amount of carrier water be as small as possible.

Normally, the amount of water to be treated is about 1/10 of the carrier water, so if the ball becomes clogged in the reverse osmosis membrane section for some reason, most of the water to be treated will pass through the reverse osmosis membrane and the ball will become clogged. There will be a shortage in the amount of water required to pump the water.

Therefore, there are problems such as not only insufficient cleaning but also the risk of damaging the reverse osmosis membrane due to the high-pressure water to be treated.

An object of the present invention is to provide a cleaning device that eliminates the drawbacks of the conventional devices described above and can quickly push out sponge balls and restore the original state when they become clogged inside the tubular body of a reverse osmosis membrane device. There is a particular thing.

The internal pressure tubular type reverse osmosis membrane cleaning device of the present invention is provided with a flow rate adjustment bypass path that bypasses the pressure adjustment valve of the cleaning fluid flow path.

According to the above configuration, during cleaning, it is possible to push out the ball blocked in the tubular with low-pressure fluid at a high flow rate.

FIG. 2 shows one embodiment of the present invention.

In this device, the main parts of the cleaning device are the same as the device shown in FIG. Close valve 15 at the appropriate time and close valve 13.
is opened to guide the water to be treated to the parallel pipe 14 and discharge it to the outside of the system.

When a sponge ball becomes clogged inside the tubular body of the reverse osmosis membrane device, the valve 15 is closed and the valve 13 is opened, so that the water to be treated is discharged at low pressure, and the amount of water passing through the reverse osmosis membrane is reduced.

On the other hand, the reduced amount of water that passes through the reverse osmosis membrane remains inside the tubular body, and the flow rate inside the tube increases.

Therefore, the blocked ball is pushed out of the tube by the increased pressing force due to the increased amount of water.

Furthermore, if a centrifugal pump is used as the pressurizing pump, for example, the fluid does not pass through the pressure regulating valve 12.
The fluid resistance decreases accordingly, and the amount of water that pushes out the ball increases.

It goes without saying that the present invention is not limited to the device examples shown in the above embodiments, but extends to various modifications that provide the same effects.

As described above, according to the present invention, when the ball is blocked, the pressure increase on the low pressure side can be suppressed, thereby reducing the amount of water to be treated passing through the reverse osmosis membrane and increasing the amount of water in the pipe. It is possible to increase the pressing force against the blocking ball and quickly push it out of the tube, thereby restoring the performance of the reverse osmosis membrane surface.

[Brief explanation of drawings]

Figure 1 shows the flow sheet of a conventional reverse osmosis membrane cleaning device.
and FIG. 2 is a flow sheet showing one embodiment of the cleaning apparatus of the present invention. 1.2, 3, 4, 5, 6, 7...Valve, 9.
... Ball collector, 10 ... Ball collector, 11 ... Ball storage tank, 12 ... Pressure adjustment valve, 13゜15 ...・Valve, 8...
...Tubular module, 14...Parallel piping (
bypass route).

Claims (1)

[Claims] 1. An apparatus for cleaning an internal pressure tubular type reverse osmosis membrane using a fluid containing sponge balls, characterized in that an internal pressure tubular type reverse osmosis membrane is provided with a flow rate adjustment bypass path that bypasses a pressure adjustment valve in the cleaning fluid flow path. Membrane cleaning equipment.