JP2005177721A - Disinfection apparatus for water to be treated - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disinfection apparatus for water to be treated capable of saving waste power in small amount of water to be treated, surely performing sterilization treatment, and excellent in energy saving. <P>SOLUTION: The disinfection apparatus for water to be treated circulates water to be treated around a disinfecting lamp 27 to disinfect the water. The apparatus is provided with a plurality of disinfection chambers 26a, 26b, and 26c, each having a built-in disinfecting lamp, and circulation space for water to be treated within the range of effective scope of irradiation of disinfecting rays. The plurality of disinfection chambers are provided with partitioning chambers 25 to communicate with the disinfection chambers individually. Shuttering boards 11 having different overflow height are provided at the entrance side of the partitioning chambers 27, thus increasing or decreasing the number of disinfection chambers in which water to be treated flows. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a treated water disinfecting apparatus for disinfecting treated water such as clean water or sewage by irradiation with a disinfecting lamp.

  In general, a disinfecting lamp is provided for treated water such as clean water or sewage, and the treated water is disinfected by irradiation of light (ultraviolet rays) from the lamp. Usually, a single disinfecting apparatus is provided with a plurality of (for example, three) ultraviolet lamps. The treated water of clean water or sewage has a structure that flows along the periphery of the ultraviolet lamp for disinfection, and the treated water flowing around the ultraviolet lamp is irradiated with ultraviolet rays. Conventionally, since the treated water passage is provided at one location for three ultraviolet lamps, the treated water flows uniformly with respect to the three ultraviolet lamps.

  In such a disinfection device, dimming control is performed to adjust the lamp output in accordance with the flow rate of treated water from the viewpoint of energy saving. That is, the lamp output is dimmed to, for example, 80% when the level of treated water is low, 90% when the level is intermediate, and 100% when the level is high.

  However, such control is not sufficiently effective in terms of energy saving and lamp life because all the lamps are lit even when the flow rate of treated water is small.

Thus, it has been proposed to control the number of disinfecting lamps to be changed according to the amount of treated water in accordance with the amount of treated water (see, for example, Patent Document 1).
JP 2001-29943 A

  However, when the number of lighting is changed as described above, there is only one treated water passage for a plurality of disinfecting lamps. Therefore, if the amount of treated water is small and the number of lamps turned on is reduced, The treated water flowing through the water may not be sufficiently irradiated with ultraviolet rays, and a sufficient disinfecting effect may not be obtained.

  An object of the present invention is to provide a treated water disinfecting apparatus excellent in energy saving, which can save wasteful power when the amount of treated water is small, and which can be surely sterilized.

  A treated water disinfecting apparatus according to the present invention is a treated water disinfecting apparatus that disperses treated water around a disinfecting lamp and disinfects it with a light beam emitted from the disinfecting lamp. A plurality of disinfection chambers having a treated water distribution space within the effective range, a plurality of disinfection chambers provided for each of the disinfection chambers, and individually connected to the corresponding disinfection chambers, and provided at the entrance side of the plurality of division chambers And a dam plate that has different overflow heights for each compartment and that increases or decreases the number of disinfection chambers into which the treated water flows according to the flow rate of the treated water.

  In the present invention, the measurement means for measuring the amount of treated water flowing through the inflow chamber having the lowest overflow height and the disinfection chamber connected thereto, and the amount of treated water measured by the measurement means are input, and the amount of treated water is If it is lower than the scheduled level, a lamp output control means for reducing the output of the disinfecting lamp provided in the disinfecting chamber may be further provided.

  Further, in the present invention, a plurality of disinfection chambers each having a disinfection lamp and having a treated water distribution space within the effective range of the disinfection beam, and an entrance portion of the corresponding disinfection chamber provided for each of the plurality of disinfection chambers The gate that can be opened and closed individually, the treated water measuring means for measuring the treated water amount, and the treated water amount measured by the measuring means are input, and the gate is opened / closed as the treated water amount increases / decreases. You may make it the structure provided with the gate control means to perform closing control.

  Further, in the present invention, when the amount of treated water measured by the treated water measuring means is less than a predetermined set value, the output of the disinfection lamp in the disinfection chamber with the gate open may be reduced.

  According to the present invention, the disinfection chambers each having a disinfection lamp are individually provided, and the number of disinfection chambers through which the treated water flows is changed according to the treated water flow rate, so that the disinfecting chamber can be used regardless of the flow rate. The light emitted from the lamp is reliably irradiated to the treated water, can be sufficiently disinfected, and if the amount of treated water is small, the number of lighting lamps can be reduced. Can be obtained.

  Hereinafter, an embodiment of a treated water disinfection apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cross section of the apparatus according to this embodiment, and FIG. 2 is a view taken in the direction of arrow A in FIG.

  In FIG. 1, 10 is a treatment water disinfection device using ultraviolet rays, which is attached to the outer surface of the partition wall 11 of the treatment water tank 16, and the inside of the treatment water tank 16 is an opening provided in the partition wall 11 (hereinafter referred to as a treatment water inlet). It is communicated via 18). The treated water tank 16 is for treating, for example, sewage by an activated sludge method or a precipitation method.

  The treated water disinfection apparatus 10 has a container 21 that communicates with the inside of the treated water tank 16 through an inlet 18. The inside of the container 21 is partitioned into an inflow chamber 24, a partition chamber 25, and a disinfection chamber 26 in order by a dam plate 22 and a partition plate 23 with respect to the direction of treatment water flow (from left to right in the drawing).

  The dam plate 22 has upper sides 22a, 22b, and 22c whose heights are changed stepwise as shown in FIG. 2 in order to change the overflow height of the treated water. In addition, the compartment 25 and the disinfection chamber 26 are divided into widths equal to the widths of the upper sides 22a, 22b, and 22c having different heights. That is, in FIG. 2, the sterilized chambers 26 a, 26 b, and 26 c that are divided are illustrated, but the divided chamber 25 is similarly divided. In addition, an opening 23a is formed between the bottom of the partition plate 23 and the bottom plate, and treated water in each compartment 25 passes through the opening 23a into the corresponding disinfection chambers 26a, 26b, and 26c. Inflow from the bottom.

  Disinfection lamps 27 are vertically installed in the respective sterilization chambers 26 a, 26 b, and 26 c, flow in from the lower opening 23 a, rise in the sterilization chambers 26 a, 26 b, and 26 c, and flow out from the upper outlet 29. Irradiate treated water with ultraviolet rays to sterilize and disinfect. As shown in FIG. 1, the disinfection lamp 27 is connected to a high frequency power supply 34 via a lamp output control means 35, and is lit at a predetermined output by the high frequency power supply 34 under the control of the lamp output control means 35. Emits ultraviolet light.

  Here, each of the sterilization chambers 26a, 26b, and 26c is dimensioned so as to have a treated water circulation space within an effective irradiation range of ultraviolet rays (light for sterilization) by the built-in sterilization lamp 27.

  33 is a means for measuring the flow rate of the treated water, and measures the amount of treated water flowing through the compartment 25 having the lowest overflow height of the treated water and the disinfection chamber 26a communicating therewith. A level meter is used as the measuring means 33. By measuring the water level in the disinfection chamber 26a with the level meter 33, the amount of treated water flowing through the compartment 25 and the disinfection chamber 26a connected thereto is measured.

  The lamp output control means 35 reduces the output of the disinfection lamp 27a in the corresponding disinfection chamber 26a to, for example, about 70% when the amount of treated water flowing through the disinfection chamber 26a is equal to or less than a set value.

  Next, the operation of the present embodiment having such a configuration will be described.

  In FIG. 1, sewage treated water that has been settled or activated sludge treated in the treated water tank 14 flows into the ultraviolet disinfection device 10 from an inlet 18 formed in the partition wall 11. The treated sewage treatment water enters the inflow chamber 44 of the container 21, overflows at least one of the upper sides 22 a, 22 b, 22 c of the weir plate 22 according to the flow level, and enters the corresponding compartment 25. The treated water flows downward in the compartment 25 and flows into the corresponding disinfecting chamber 26 from the opening 23 a below the partition plate 23. Further, the flow rises in the disinfection chamber 26, flows along the outer periphery of the disinfection lamp 27, and is irradiated with ultraviolet rays.

  By this ultraviolet irradiation, harmful bacteria such as Escherichia coli contained in the sewage treated water are killed. In addition, as the ultraviolet rays irradiated from the disinfecting lamp 27, ultraviolet rays having a wavelength of 253.7 nm are effectively used. The sewage treated water sterilized in the sterilization chamber 26 in this way flows out from the outlet 29, and once accumulated in a sterilization treatment tank (not shown), it is discharged into a river or a sea area.

  Here, when the flow rate level of the treated water is a small flow rate that exceeds the upper side 22a of the lowest overflow height of the barrier plate 22 as shown in FIG. 1, for example, this is called the L level. Water flows only into the compartment 25 corresponding to the upper side 22a, and flows only from the compartment 25 to the disinfection chamber 26a shown in FIG. 2 through the lower opening 23a. Therefore, in this case, only the disinfecting lamp 27a in the disinfecting chamber 26a has only to be turned on, and useless power is not consumed. In the sterilization chamber 26a, all treated water passes within the effective irradiation range of the sterilization lamp 27a, so that it is surely sterilized by ultraviolet rays.

  Further, when the flow rate level of the treated water is a medium flow rate exceeding the upper side 22b of the barrier plate 22 (this is referred to as M level), the treated water flows into the compartments 25 corresponding to the upper sides 22a and 22b, These compartments 25 flow through the lower opening 23a to the two disinfection chambers 26a and 26b shown in FIG. In this case, only the disinfecting lamps 27a and 27b in the disinfecting chambers 26a and 26b have to be turned on, and useless power is not consumed. Further, in the disinfection chambers 26a and 26b, all the treated water passes through the effective irradiation ranges of the disinfection lamps 27a and 27b, respectively.

  Further, when the flow rate of the treated water is a large flow rate exceeding the highest upper side 22c of the barrier plate 22 (this is called the H level), the treated water flows into the compartments 25 corresponding to the upper sides 22a, 22b and 22c, respectively. Then, it flows from these compartments 25 through the lower opening 23a to the three disinfection chambers 26a, 26b and 26c shown in FIG. In this case, the disinfection lamps 27a, 27b, and 27c in the disinfection chambers 26a, 26b, and 26c are turned on. In these sterilization chambers 26a, 26b, and 26c, all the treated water passes through the effective irradiation ranges of the sterilization lamps 27a, 27b, and 27c, respectively. It is surely disinfected by ultraviolet rays.

  According to the above embodiment, the number of the disinfection chambers 26 into which the treated water flows is determined according to the flow level L, M, H corresponding to the overflow height of each upper side 22a, 22b, 22c of the barrier plate 22. The number of lamps 27 can be controlled, and power consumption due to unnecessary lamp lighting can be eliminated. Further, the treated water only flows within the effective irradiation range of the lit lamp in the sterilization chamber 26, and is surely sterilized by ultraviolet rays at any flow rate.

 Further, when the treated water level is further lowered than the L level (this is referred to as the LL level), the level meter 33 detects the flow rate level LL. In this case, like the L level, only one lamp 27a is lit, but the lamp output control means 35 controls the applied voltage, current, pulse repetition frequency and pulse width based on the LL level detection signal. The lamp output is controlled to 70%, for example. Thus, if the lamp output is controlled at the LL level, the energy saving effect is further increased.

  Next, the embodiment shown in FIGS. 3 and 4 will be described. 3 and FIG. 4, the same reference numerals are given to the corresponding parts in FIG. 1 and FIG.

  Also in this embodiment, the treated water disinfecting apparatus 10 has a container 21 that communicates with the inside of the treated water tank 16 through the inlet 18. Further, in this container 21, the barrier plate 22 shown in FIG. 1 is not provided, but only the partition plate 23 in the vertical direction is provided. Therefore, the inside of the container 21 is divided into an inflow chamber 24 and a disinfection chamber 26.

  As shown in FIG. 4, the sterilization chamber 26 is partitioned into a plurality of chambers (three chambers in the illustrated example) 26a, 26b, and 26c. In addition, gates 32a, 32b, and 32c that can be individually opened and closed are provided below the partition plate 23 between the disinfection chambers 26a, 26b, and 26c. For these gates 32, for example, motorized valves are used. The treated water in the inflow chamber 24 flows into the corresponding disinfection chambers 26a, 26b, and 26c from below through the gates 32a, 32b, and 32c that have been opened.

  Disinfecting lamps 27 are vertically installed in the disinfecting chambers 26a, 26b, and 26c. The disinfecting lamps 27 flow in from the lower gate 32, ascend in the disinfecting chambers 26a, 26b, and 26c, and exit from the upper outlet 29. Irradiate the treated water flowing out with ultraviolet rays to sterilize and disinfect. The disinfecting lamp 27 is connected to a high frequency power source 34 via a lamp output control means 35. Each of the sterilization chambers 26a, 26b, and 26c is dimensioned so as to have a treated water circulation space within the effective irradiation range of ultraviolet rays by the built-in sterilization lamp 27.

  A level meter 33 that is a means for measuring the amount of treated water is provided in the inflow chamber 24 and detects the amount of treated water flowing into the disinfecting apparatus 10. The detection signal of the level meter 33 is output to the lamp output control means 35 and the gate control means 36.

  In the above configuration, sewage treated water that has been settled and activated sludge treated in the treated water tank 16 flows into the treated water disinfecting apparatus 10 from the inlet 18 formed in the partition wall 11. This sewage treated water enters the inflow chamber 24 of the container 21, flows downward, changes direction in the horizontal direction, and flows into the corresponding disinfection chamber 26 through the opened gate 32. The treated water flows upward in the disinfection chamber 26 and flows along the outer periphery of the disinfection lamp 27. For this reason, harmful bacteria such as Escherichia coli contained in the sewage treated water are killed by ultraviolet rays (effectively ultraviolet rays having a wavelength of 253.7 nm) irradiated from the lamp 27. The sewage treatment water sterilized in the sterilization chamber 26 flows out from the outlet 29, and once collected in the sterilization treatment tank, it is discharged into a river or a sea area.

  Here, the level meter 33 detects the flow levels L, M, and H described above, and the gate control means 36 opens and closes the gate 32 in response to the detection signal. By this control, the number of the sterilization chambers 26 into which the treated water flows is determined, and the number of lamps 27 that are lit can be controlled.

  That is, when the level of the treated water is detected by the level meter 33, the gate 32a is opened when the level is L, the gates 32a and 32b are opened when the level is M, and all the gates 32a, 32b and 32c are opened when H. The treated water flows into the corresponding disinfection chamber 26 through the gate 32 that has been opened. Therefore, only the lamp 27 in the disinfection chamber 26 into which the treated water has flowed is turned on.

  In this way, only the necessary lamps 27 are turned on according to the amount of treated water, so that useless power consumption can be eliminated. Further, since the treated water only flows through the sterilization chamber 26 where the lamp 27 is lit, all the treated water that has flowed in flows within the effective irradiation range of the lamp 27 and is surely sterilized by the ultraviolet irradiation.

  Further, when the flow level LL is detected by the level meter 13, disinfection is performed by lighting a single lamp as in the case of L. However, the lamp output control means 35 uses the applied voltage, current, pulse repetition frequency and Dimming control is performed to 70% by controlling the pulse width.

  As described above, in any of the above-described embodiments, high energy savings can be obtained by controlling the number of lamps 27 to be lit and dimming control corresponding to the amount of water to be processed, and any processing flow rate can be used for all processing. It is possible to irradiate water uniformly with ultraviolet rays and perform reliable disinfection.

In addition, the comparison of the electric capacity of the conventional and this invention and the amount of treated water is as follows. Thus, the smaller the flow rate, the greater the influence of the number of lighting, and in the case of L, the electric capacity is reduced to about 2/5 compared to the case of the conventional lighting with three dimming controls.

It is apparatus sectional drawing explaining one Embodiment of the treated water disinfection apparatus by this invention. It is A arrow directional view of FIG. It is apparatus sectional drawing explaining other embodiment of the treated water disinfection apparatus by this invention. FIG. 4 is a view taken in the direction of arrow B in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Treated water disinfection apparatus 22 Barrage plate 25 Separation chamber 26a, 26b, 26c Disinfection chamber 27a, 27b, 27c Disinfection lamp 32a, 32b, 32c Gate 33 Treated water amount measurement means 35 Lamp output control means 36 Gate control means

Claims (4)

A treated water disinfection device that circulates treated water around a disinfection lamp and disinfects the light emitted from the disinfection lamp,
A plurality of disinfection chambers each having a disinfection lamp and having a treated water distribution space within the effective irradiation range of the disinfection beam;
A plurality of chambers corresponding to the plurality of sterilization chambers are provided, each of which is individually connected to the corresponding sterilization chamber,
A dam plate provided on the entrance side of the plurality of compartments, having a different overflow height for each compartment, and increasing or decreasing the number of disinfection chambers into which the treated water flows according to the flow rate of the treated water,
A treated water disinfection device characterized by comprising: A measuring means for measuring the amount of treated water flowing through the compartment with the lowest overflow height and the disinfection chamber leading to it,
When the amount of treated water measured by this measuring means is input, and the amount of treated water is lower than the planned level, lamp output control means for reducing the output of the disinfecting lamp provided in the disinfection chamber,
The treated water disinfection device according to claim 1, further comprising: A treated water disinfection device that circulates treated water around a disinfection lamp and disinfects the light emitted from the disinfection lamp,
A plurality of disinfection chambers each having a disinfection lamp and having a treated water distribution space within the effective irradiation range of the disinfection beam;
A gate that is provided for each of the plurality of sterilization chambers and can individually open and close the entrance portion of the corresponding sterilization chamber,
Treated water measuring means for measuring the treated water amount;
A gate control means for inputting the treated water amount measured by the measuring means and controlling the opening / closing of the gate in accordance with the increase / decrease of the treated water amount;
A treated water disinfection device characterized by comprising:   4. The apparatus according to claim 3, further comprising: lamp output control means for reducing the output of the disinfecting lamp in the disinfecting chamber with the gate open when the amount of treated water measured by the treating water measuring means is less than a predetermined set value. Treated water disinfection device as described in 1.

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