JPS58101779A - Water quality monitoring device of waste water reutilizing equipment - Google Patents

Abstract

PURPOSE:To automatically monitor a water quality of a waste water reutilizing equipment at all times, by projecting a light to purified water by the waste water reutilizing equipment, and detecting a water quality by a deviation of a projected luminous flux and a purified water transmitted luminous flux. CONSTITUTION:In the ultrafiltration method, for instance, purified water from each membrane unit of an ultrafilter 15 is led into a water chamber 30 of a monitoring device through a drain pipe 17, is made to pass through, and is fed to a storage tank 20. The chamber 30 has light transmitting members 31, 32 opposed in the upper and lower parts, and a luminous flux projected from a projector 35 in the rear of the member 31 isolated from water in the chamber 30 is diverted by a mirror 36, reaches photodetectors 40, 42, and each output signal is inputted to a controller 41. In case when the purified water is clean, outputs of the photodetectors 40, 42 are equal, and the controller 41 generates no output. If the situation such as peeling of a film surface gel layer of the membrane unit occurs, a degree of cleanness of the purified water drops remarkably, and an output deviation of the photodetectors 40, 42 exceeds a reference value. As a result, the controller 41 generates an output, an alarm device 44 is energized, and simultaneously, valves 48, 51 are switched, and a valve 47 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water quality monitoring device for wastewater reuse equipment.

With the remarkable economic growth over the past 20 years, the demand for water in Japan has increased rapidly.In particular, in metropolitan areas, the demand for water has increased due to the concentration of population in cities, the rapid increase in the number of business establishments, and the spread of sewage systems. As a result, many metropolitan areas are expected to fall into chronic water shortage situations in the next few years, even in Japan, which was traditionally considered to be relatively blessed with water resources. .

In preparation for such a situation, an increasing number of large-scale consumption facilities are installing wastewater reuse equipment, but at present, the cost of purified water obtained from wastewater reuse equipment is still higher than current water charges. Since the costs are much higher, the number of facilities with such reuse equipment is small. In addition to these cost issues, conventional wastewater reuse equipment requires a large settling tank and generates a large amount of sludge, which has prevented the spread of wastewater reuse equipment. .

However, recently, with the development of sewage purification technology, relatively inexpensive and compact wastewater reuse equipment suitable for small and medium-sized consumption facilities has been developed. The demand for this is also increasing. Among these small-sized wastewater reuse facilities, there are facilities that omit the final sedimentation tank by adopting the ultrafiltration method conventionally used in the food industry, etc., and these facilities require the necessary installation. It has the characteristics of a small area and very little sludge generation, but since it has only been developed for a short time,
There are still some issues that need to be improved, such as the following:

As is well known, ultrafiltration, like reverse osmosis, is a membrane separation technology that uses a porous membrane to separate polymeric substances and suspended matter in a solution. This is carried out using a membrane that blocks the passage of high-molecular substances and colloids in the solution, but allows the passage of low-molecular substances in the bath liquid. However, the actual filtration effect of ultrafiltration is not due to the membrane alone, but is due to the gel layer attached to the membrane surface on the stock solution side (this is the gelation of colloids and suspended substances in the stock solution) and the membrane. Because the filtration action is based on two layers of gel, if the gel layer peels off due to mechanical vibrations or other causes, the filtration performance of the equipment (equipment that uses ultrafiltration method) will be greatly reduced, resulting in a loss of purified water. The problem was that water quality deteriorated significantly. In particular, when the yA solution to be treated is human waste treated water that has been treated by the activated sludge method, when the gel layer is peeled off, bacteria contained in the raw solution may also pass through the membrane. Since there is a risk of water flowing out into the purified water area, a device is required to reliably detect the occurrence of such a situation, but conventional wastewater reuse equipment (using ultrafiltration) is not equipped with this equipment. It wasn't. Therefore, the purpose of this invention is to
To provide a water quality monitoring device for wastewater reuse equipment, and particularly to provide a water quality monitoring device for wastewater reuse equipment that is suitable for a type of wastewater reuse equipment that employs membrane separation technology such as ultrafiltration. It is.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the overall configuration of a known building wastewater reuse facility to which the present invention can be applied, and FIG.
1 is a schematic diagram of an embodiment of the device of the invention; FIG.

In Fig. 1, 1 is the raw water introduction pipe, and the raw water introduction pipe 1
Raw water such as human waste water is introduced into the flow rate regulating tank 2 through the tank. Air is blown into the raw water stored in the flow rate adjustment tank 2 through the blowing pipe 4 through the air suction pipe 3, and then pumped up by the pump 5 and transferred to the aeration tank 6. On the other hand, air is blown through the air suction pipe 7 and from the blowing pipe 8, thereby performing shearation. The activated sludge mixed liquid is transferred from the bottom of the aeration tank 6 to the stirring tank 11 by the pump 10 via the piping 9. After the solids and liquid are further mixed well by the rotary screen 12 in the stirring tank 11, the activated sludge mixture is transferred to the piping 13. The water is then sent by a pump 14 to an ultrafilter 15, which is the final stage purification device of the facility. The ultrafiltration@15 is equipped with a large number of membrane units 16 (filter units made of ultraPJIJlG) on its peripheral wall, and a purified water discharge pipe 17 is connected to the outside of each membrane unit 16. The terminal ends of each purified water discharge pipe 17 (there are the same number as the membrane units) are connected to a pump tg, and the pump 18 generates a pressure difference between the inner and outer surfaces of each membrane unit 16. ing. The water stored inside each membrane unit 16 (that is, the water stored inside the ultrap filter) is agitated by impellers (not shown) rotated by the motor 19, which also causes aeration inside the ultrafilter. Each membrane unit 16 is
The thickness of the gel layer adhering to the inner surface of the membrane unit 16 is controlled so that the thickness of the gel layer is constant. After being stored in the purified water storage tank, it is pumped up by a pump n and sent to an elevated water tank or the like for reuse.

On the other hand, when the activated sludge in the ultrafilter 15 becomes excessive, the piping system is constructed so that the activated sludge is returned to the aeration tank 6 via a return pipe, and the agitation tank 11 and the aeration tank 6
A return pipe is also provided between the two. In addition, as the concentration of the activated sludge mixture introduced into the ultrafilter 15 is adjusted,
Alternatively, the pipe δ for returning purified water below the water quality standard to the ultrapolar filter 15 is connected to the discharge side of the pump 18 and the pipe 1.
30, and the pipe 5 includes a stirring tank and a pump n.
is provided.

In the known wastewater reuse equipment with the configuration shown in Figure 1,
When a mechanical shock is applied to the membrane unit 16 composed of an ultratear film, the gel layer formed on the raw water side membrane surface of the P membrane peels off, and as a result, the ultrafilter 15 There was a risk that bacteria and the like would get mixed into the purified water that was taken out, but no device was installed to detect and prevent this.

The water quality monitoring device of the present invention is suitable for a wastewater reuse facility configured as described above, and one embodiment thereof is shown in FIG.

The water quality monitoring device of the present invention shown in FIG.
It is configured so that it can be connected to 16 purified water discharge pipes 17.

In Fig. 2, A is a cylindrical casing made of a transparent material, and a cylindrical body row made of a transparent material is provided in the center of the casing row, and inside the mosquito cylindrical body 4 is the drainage water. An ice chamber is formed into which purified water discharged from the ultrafilter 15 of the reuse facility is introduced. A first and second light-transmitting member 31, 32 are arranged opposite to each other on both end wall surfaces between the ice chambers, and behind these light-transmitting members 31, 32, a first and second light-transmitting member 31, 32 isolated from the water chamber is arranged. A second detection equipment room and control room are provided. The outer walls of each detection equipment room and its walls are made of a light-blocking material to prevent natural light from entering the room and its interior. Although the first light-transmitting member 31 and the second light-transmitting member 32 are configured as lenses in this embodiment, they may be ordinary glass plates or the like.

The first detection equipment chamber behind the first light-transmitting member 31 accommodates a projector 35 for projecting a luminous flux such as monochromatic light into the water chamber through the light-transmitting member 31, and A mirror I is disposed between the projector and the first light-transmitting member 31 to divert a part of the projected light beam from the projector. The projector itself may have a built-in light source, but if it does not have a built-in light source, for example, it can be connected from the light source side outside the casing row through an optical transmission body 37 such as a source fiber. The wall surface of the detection equipment chamber 33 facing the reflective surface of the mirror may be provided with a light-shielding hole 39 for guiding the light beam split by the mirror. A first photoreceiver 40 is disposed within 39 . The first light receiver 40 is a device that generates an output signal according to the intensity or phase of the light beam incident thereon, and is formed integrally with a control device 41 installed on the outer wall of the casing row. Behind the second light-transmitting member 32 and behind the second detection device, there is a second light receiver 42 that receives the water in the water garden and the transmitted light that has passed through the second light-transmitting member 32. The second light receiver 42 is connected to the control device 41 via a transmission line 43 such as electrical wiring or optical fiber. The second photoreceiver 42 may be the same as the first photoreceiver 40 and generates an output signal depending on the intensity or phase of the incident light beam. The first and second photoreceivers 40 and 42 may be constructed as photoelectric converters, but may also be pre-detectors which produce optical signals as output signals.

The control device [41 has a circuit that detects the difference between the output signals generated from the first and second light receivers 40 and 42, and generates a control signal S when the difference between the output signals exceeds a predetermined value. It has a built-in circuit, and is used not only to operate the controlled member, which will be explained later, but also to energize the alarm device 44, etc.

In this embodiment, the water chambers have a structure that allows purified water from the wastewater reuse equipment to pass through continuously, and a purified water introduction pipe 45 is inserted in the upper part between the water chambers, and an ice chamber ) A purified water outflow pipe 46 is inserted into the lower part of the pipe.

These pipes 45 and 46 are opened on the outer peripheral surface of the casing, respectively, and are connected to the middle of the purified water discharge pipe 17 of the wastewater reuse facility. The tips of each of the purified water introduction pipe 45 and the purified water introduction pipe holder are configured in a nozzle shape, and in the ice room, the surfaces of the first light-transmitting member 31 and the second light-transmitting member 32, respectively. The surface of the first transparent member 31 is constantly cleaned by purified water discharged from the purified water introduction pipe 45, and the surface of the first transparent member 31 is disposed close to the second transparent member 32. The surface is constantly cleaned by a strong water flow sucked into the purified water outflow pipe 46.

In the upstream section 17a of the purified water discharge pipe 17 of the wastewater reuse equipment connected to the purified water inlet pipe 45, there is provided a shield well 47 that constitutes a part of the device of the present invention.
7C is configured to be closed by a control signal S from the control device 41. Further, on the downstream side of the shield well 47, a glass tube enlarged portion 17c for observation is provided. Further, a switching valve 48 controlled by the control device 41 is provided downstream of the purified water discharge pipe 17 connected to the purified water outflow pipe 46, and a drain pipe 49 is connected to the switching valve 48. The switching valve 48 connects the water chambers to the drain pipe 49 according to a control signal from the control device 41, but normally (when there is no signal from the control device 41) the ice chamber (9)
is connected to the purified water storage tank via the downstream portion 17b of the purified water discharge pipe 17.

On the other hand, a switching valve 51 is also provided in the piping 13 for supplying primary water to the ultrap filter 15, and a drain pipe 52 for draining the ultrafilter 15 via the switching valve 51 is connected to the switching valve 5.
1, and the switching valve 51 is also configured to be operated by the output signal S of the control device 41.

In this embodiment, since the row of cylindrical bodies forming the ice chamber (9) and the outer casing are made of transparent material, external natural light enters the ice chamber (9) and is not detected. Therefore, in order to prevent this, the main part of the outer peripheral wall of the cylindrical body row is covered with a light shielding film.

Next, the operation of the apparatus of the present invention having the above configuration will be explained.

When the ultrafilter 15 of the wastewater reuse facility (Fig. 1) is operating normally (that is, when the gel layer on the inner membrane surface of the membrane unit 16 does not peel off), water flows into the ice chamber (9). Since the purified water does not contain bacteria and is clear, the output signals from the first and second light receivers 40 and 42 are equal, and therefore no output is generated from the control device 41. As a result, the tank well 47 is kept open, while the switching valve 48 is kept connected to the water chamber I to the purified water storage tank. Further, the switching valve 51 communicates the ultrafilter 15 with the stirring [11]. In this case, ultrafilter 1
Even if the purified water introduced between the water chambers 5 and 40 has turbidity below the allowable standard and a deviation occurs in the output signals generated from the first and second light receivers 40 and 42, the deviation is within the predetermined range. As long as the reference value is not reached, no output is generated from the control device 41, so the six valves 47, 48, and 51 do not operate.

However, if the gel layer on the membrane surface of the membrane unit of the ultrafilter 15 peels off, the water chamber I
If the incoming purified water is contaminated with bacteria in excess of the standard value, or the clarity is significantly reduced, the degree of scattering of the light beam projected into the water chamber from the floodlight is high. As a result, the output of the first receiver 40 and the second receiver 4
The deviation from the second output exceeds a predetermined reference value.

Therefore, an output signal is generated from the control device 141 and the alarm device 44 is energized, and at the same time, the shielding well 47- is closed and the discharge of purified water from the ultrafiltration rock 15 is stopped. On the other hand, the switching valves 48 and 51 are activated by a signal from the control device 41.
is operated, the water chamber I is connected to the drain pipe 49 by the switching valve 48, and the contaminated water in the water chamber I is discharged through the drain pipe 49 to a contaminated tank (not shown), etc. The inside of the outer filter 15 is drained via a drain pipe 52.

As described above, according to the present invention, there is provided a water quality monitoring device that can automatically detect the water quality of a known wastewater reuse facility and prevent water below a standard value from being reused. Ru.

Therefore, according to the present invention, it is possible to constantly and automatically monitor known wastewater reuse equipment, which conventionally had the risk of generating recycled water below water quality standards, thereby increasing the usefulness of the wastewater reuse equipment. be able to.

In addition, although the above-mentioned example showed an example in which the present invention was applied to an ultra-tear type wastewater reuse equipment, it is clear that the present invention can be applied to other types of wastewater reuse equipment. . Further, in the above embodiment, the casing etc. are made of a transparent material, but it goes without saying that the entire casing, including the casing, may be made of a non-transparent material. Furthermore, it is within the scope of the present invention to replace each part of the device shown in this embodiment with an equivalent device having the same function.

Further, as a warning device, it is natural to use a device that has a function that appeals to both the visual and auditory senses.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a known wastewater reuse facility, and Figure 2 is a schematic diagram of a known wastewater reuse facility.
1 is a schematic diagram of an embodiment of a water quality monitoring device of the present invention.

Claims (3)

[Claims] (1) An ice chamber into which purified water discharged from the purification device of the wastewater reuse facility is introduced, a light projection device that projects a predetermined luminous flux into the ice chamber, and a projection luminous flux projected into the ice chamber. a light receiver that receives the transmitted light flux after passing through the ice chamber, and a light receiver that is connected to the light receiver to detect the deviation between the projected light flux and the transmitted light flux, and a control signal when the deviation reaches a predetermined reference value. A water quality monitoring device for a wastewater reuse facility, comprising a control device that generates water, and an alarm device connected to the control device. (2) An ice chamber into which purified water discharged from the purification device of the wastewater reuse facility is introduced, first and second translucent members installed on opposing walls of the ice chamber, and an ice chamber inside the ice chamber. a light projector that is isolated from water and installed behind the first light-transmitting member; and a first light receiver that receives the projected light flux projected from the light projector to the second light-transmitting member. , a second fluorescent device that is isolated from the water in the ice chamber and is placed behind the second light-transmitting member to receive the transmitted light flux of the ice chamber; and the first and second light receivers. a control device connected to the control device that detects a deviation between the projected light beam and the transmitted light beam and generates a control signal when the deviation reaches a predetermined reference value; and an alarm device connected to the control device; A purified water introduction pipe arranged in the ice chamber so as to spout the purified water toward the front surface of the second light-transmitting member, and a purified water in the ice chamber disposed along the front surface of the second light-transmitting member. A water quality monitoring device for wastewater reuse equipment, comprising: a purified water outflow pipe arranged in the ice chamber so as to suck out water. (3) An ice chamber into which purified water discharged from the purification device of the wastewater reuse facility is introduced, a projection device that projects a predetermined luminous flux into the ice chamber, and a projected luminous flux projected into the ice chamber. A light receiver receives the transmitted light flux after passing through the water chamber, and is connected to the light receiver to detect the deviation between the projected light flux and the transmitted light flux, and to control when the deviation reaches a predetermined reference value. A control device that generates a signal, and a f connected to the control device.
A water quality monitoring device for wastewater reuse equipment, comprising: a water quality monitoring device for wastewater reuse equipment; and a device for stopping discharge of purified water from the wastewater reuse equipment in response to the control signal.