JP4977651B2 - Water treatment system - Google Patents

Description

  The present invention relates to a water treatment system for purifying water or rainwater drawn from a water source such as a well, river or pond.

There is a desire to use water or rainwater drawn from water sources such as wells and rivers as laundry and bath water, or to spray water for plant cultivation.
However, recently, the quality of well water has been remarkably deteriorated due to changes in the strata itself or the penetration of pollutants into groundwater veins, and it has become difficult to use the well as it is. Similarly, river water often deteriorates in water quality. The deterioration of water quality as used herein means that the turbidity and chromaticity of water is increased, or that an odor is generated from water.

  For example, the well may be so-called “red water”. “Red water” means that when well water is pumped out, it turns red over time, making it unsuitable for use as laundry or bath water, and also has an adverse effect on plant cultivation. Water. Red water is water containing iron and manganese components as ions. For example, iron is stably present in pressurized water as ferrous bicarbonate, but when pumped up, it changes to ferrous hydroxide and is oxidized to ferric hydroxide by contact with air. To make it reddish.

In some cases, ammonia or the like permeates from the ground, thereby contaminating well water or river water and causing odor.
In Patent Document 1, in order to improve the quality of well water that is not suitable for such use, the iron content in water is oxidized by ozone treatment to remove the oxidized iron content. There has been proposed a water receiving type well improvement device which can sterilize various germs, E. coli, viruses and the like in water.

Further, Patent Document 2 discloses a water treatment that combines manganese removal treatment, ozone treatment, membrane filtration treatment, and activated carbon treatment, thereby suppressing clogging of the membrane with a small amount of ozone injection, and a stable amount of treated water at a high flow rate. A water treatment method and apparatus capable of obtaining the above has been proposed.
Japanese Patent No. 2715244 JP 2002-86193 A

The water quality improvement apparatus described in Patent Document 1 is large and has a complicated apparatus configuration.
The water treatment apparatus described in Patent Document 2 must use an oxidizing agent such as chlorine, sodium hypochlorite, potassium permanganate, and chlorine dioxide for the manganese removal process. However, when impurities such as humic substances, which are precursors of trihalomethanes, are present in the water to be treated, when an oxidizing agent, for example, a large amount of chlorinating agent is added, the chlorinating agent reacts with the humic substances to produce trihalomethane. There is.

In addition, manganese sand has a property of adsorbing manganese ions. However, in the water treatment method described in Patent Document 2, depending on the concentration of the oxidizing agent, the water may become insoluble before manganese ions in water are adsorbed on the manganese sand. There is a possibility that the removal performance by manganese sand cannot be fully achieved.
The present invention has been made based on such a technical background, and a main object of the present invention is to provide a water treatment system capable of improving water quality with a relatively simple configuration.

  Another object of the present invention is to provide a batch processing type water treatment system in which water to be treated is stored in a first tank and circulated and purified, and then the purified water in the first tank is transferred to the second tank. And

The invention according to claim 1 is a first tank for accumulating water, a circulating water purification device that pumps and purifies water from the first tank and returns it to the first tank, and the first water after purification. In a water treatment system having a second tank for transferring and storing one tank of water, the circulating water purification device filters a water pump pumped out and circulated, and water circulated by the circulation pump A filter for removing impurities contained in the water, an ozone treatment device for mixing ozone into the water filtered by the filter, and a predetermined time from the start of pumping out the water in the first tank, without operating the ozone treatment device, after a certain time, and a ozone treatment delay control means for operating the ozone treatment device, wherein the filter, adsorption of manganese ions using a manganese sand filter medium A water treatment system which comprises a manganese sand filter to removed.

According to a second aspect of the present invention, the storage of water in the first tank, the circulation purification of the water in the first tank by the circulation type water purification device, and the water in the first tank after being purified are stored in the second tank. After the process of transferring to the tank is performed a predetermined number of times, the purified water collected in the first tank is not transferred to the second tank, and the ozone treatment device of the circulating water purification device is operated characterized by having a manganese sand filter regeneration control means for a predetermined time circulated in a water treatment system of claim 1, wherein.

The invention according to claim 3 is a water quality detector for detecting the water quality of the first tank after storing water in the first tank and circulating and purifying the water in the first tank by the circulating water purification device. Based on the detection output of the water quality detector, the purified water collected in the first tank is not transferred to the second tank, and the ozone treatment device of the circulating water purification device is operated. and having a manganese sand filter regeneration controlling means for a predetermined time circulation, a water treatment system of claim 1, wherein.

The invention according to claim 4 is characterized in that the water quality detector includes a measuring device for measuring at least one of turbidity, chromaticity, total iron concentration, manganese concentration, conductivity or pH of water. The water treatment system according to claim 3 .
The invention according to claim 5 is a switching operation for switching whether or not to regenerate the manganese sand filter after storing water in the first tank and circulating and purifying the water in the first tank by the circulating water purification device. And in response to the switching operation of the switching operation unit, the purified water collected in the first tank is not transferred to the second tank, and the ozone treatment device of the circulating water purification device is operated. manganese sand filter regeneration controlling means for a predetermined time circulating in the state, a water treatment system according to claim 1, wherein a.

The invention according to claim 6 stores the water in the first tank, circulates and purifies the water in the first tank by the circulating water purification device, and purifies the water in the first tank after being purified. In the process of transferring to the second tank, a predetermined amount less than half of the water purified in the first tank is transferred to the second tank, and then treated water is added to the first tank and the first tank is added. Fill the tank with water, circulate and purify the water in the first tank by the circulating water purification device, and transfer a predetermined amount less than half of the water in the first tank to the second tank after purification. The water treatment system according to claim 1, further comprising sequence control means for executing a sequence of.

According to the first aspect of the present invention, the circulation type water purification apparatus is provided with a circulation pump, a filter, and an ozone treatment device. The water is purified only by filtration through a filter for a certain period of time from the start of driving. At this time, since the filter includes the manganese sand filter, the manganese sand filter favorably adsorbs manganese ions in the water. After a certain period of time, the ozone treatment device is operated, ozone is mixed into the water, and oxidation and sterilization with ozone are performed.

  In this way, by starting the operation of the ozone treatment apparatus after the filter has been filtered for a certain period of time, manganese ions in the water are adsorbed on the filter, and ozone is adsorbed on the water after the manganese ions are adsorbed. Since it is mixed, the circulation purification of water can be performed efficiently.

According to invention of Claim 2 , 3 , and 4 , regeneration of the filter contained in a circulation type water purification apparatus, especially a manganese sand filter is performed using the oxidizing power of ozone generated in an ozone treatment apparatus. be able to.
That is, when the batch process of storing water in the first tank, purifying the water, and transferring the water in the first tank to the second tank is performed as described in claim 2 , When the batch process is performed a predetermined number of times, the manganese ion adsorption ability of the manganese sand filter of the circulating water purification apparatus decreases. The decrease in manganese sand adsorption capacity can be recovered by oxidizing manganese sand. That is, manganese sand can be regenerated by oxidation. Therefore, after the water in the first tank is purified, it is not transferred to the second tank, but the purified water in the first tank is further circulated and purified by a circulation type water purification device. The purified water is almost free of impurities, germs and the like, and there is no object of oxidation of ozone mixed in the ozone treatment apparatus, so the ozone in the water mainly works to oxidize manganese sand. The manganese sand filter can be regenerated by oxidizing the manganese sand with ozone.

In the invention according to claim 3 , when the water quality of the first tank is detected by the water quality detector, not the number of batch processing steps, and the remaining amount of manganese ions is increased, the regeneration of the manganese sand filter is performed. I decided to do it.
As described in claim 4 , various measuring devices can be used as the water quality detector.
Especially, since the chromaticity of water and a manganese concentration have a correlation, it is preferable to comprise a water quality tester using a chromaticity meter.

In the fifth aspect of the invention, for example, an operator determines whether or not to regenerate the manganese sand filter, and when regenerating the manganese sand filter, the switching operation unit is operated to regenerate the manganese sand filter. It was decided.
According to the invention described in claim 6 , in the process of purifying the water in the first tank and transferring it to the second tank, not all of the purified water in the first tank is transferred to the second tank, but less than half. Is transferred to the second tank, and then the treated water (raw water) is additionally supplied to the first tank to purify the water in the first tank.

  By adopting such a sequence, there is little change in the quality of the treated water in the first tank, the treated water in the first tank can be purified in a short time, and purified water can be efficiently produced in a short time as a whole. The effect that it can be supplied to.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing the overall configuration of a water treatment system according to an embodiment of the present invention. The water treatment system 10 includes a first tank 11 for storing water (raw water as treated water), and a circulating water purification device for pumping and purifying the water in the first tank 11 and returning it to the first tank. 12 and a second tank 13 for pumping and storing the purified water in the first tank 11.

Water from the water source is pumped into the first tank 11 by the pumping pump 14 and supplied through the pumping water channel 15.
Examples of the water source include a well, a river, a pond, a rainwater storage pool, or a poor quality water supply. When the water supply is a water source, a solenoid valve can be used instead of the pumping pump 14.

  As an example, the first tank 11 has an internal volume with a diameter φ = 580 mm and a height h = 982 mm, and is provided with a water level sensor 16 that detects an upper limit 161 and a lower limit 162. When the water level in the first tank 11 reaches the lower limit water level 162 by the water level sensor 16, the pumping pump 14 is driven and water from the water source is supplied to the first tank 11. When the accumulated water reaches the upper limit water level 161, the pumping pump 14 is stopped.

  The water stored in the first tank 11 (raw water as treated water) is pumped and purified, and then returned to the first tank 11, the circulating water purification device 12 pumps water from the circulation outlet 17 of the first tank 11. A circulation channel 19 for returning water from the circulation inlet 18 is provided. A circulation pump 20, a manganese sand filter 21, an activated carbon filter 22, and an ejector 23 are interposed in the circulation water channel 19 in this order.

When the circulation pump 20 is driven, the water stored in the first tank 11 is pumped from the circulation outlet 17, and the pumped water is filtered by the manganese sand filter 21 and then filtered by the activated carbon filter 22. And passes through the ejector 23. Then, the water returns to the first tank 11 from the circulation inlet 18 through the circulation water channel 19.
The manganese sand filter 21 uses manganese sand as a filter medium. Manganese sand is, for example, ordinary sand having a particle size of about 0.6 mm coated with manganese, and can be produced by immersing ordinary sand in water containing manganese and oxidizing it. Manganese sand is a known filter medium.

  When manganese ions are contained in the water pumped out by the circulation pump 20, the manganese ions come into contact with the manganese sand filter 21 and are adsorbed and removed by the manganese sand under the following reaction.

Further, the water is filtered through the activated carbon filter 22 to remove minute dust, odor components and the like.
The ejector 23 is supplied with ozone (air containing ozone) generated by the ozone generator 24. The ozone generator 24 has a discharge electrode, for example, and generates ozone by silent discharge or the like. The ozone generated by the ozone generator 24 is taken into the water by the negative pressure generated in the ejector 23.

  More specifically, the ejector 23 is provided with a throttle portion with a reduced flow path diameter, and the flow rate of water flowing in the throttle portion is increased. For this reason, the water pressure at the throttle is negative, and ozone is mixed into the water by this negative pressure. The mixed ozone dissolves in water as fine bubbles and oxidizes germs, Escherichia coli and other impurities in the water while being circulated through the circulation channel 19 and returned to the first tank 11.

Moreover, ozone mixed in water oxidizes iron ions and manganese ions in the water and deposits them as ferric hydroxide and manganese dioxide.
Since germs oxidized by ozone, ferric hydroxide, manganese dioxide, and the like are circulated through the circulation channel 19, they are captured and removed by the manganese sand filter 21 and the activated carbon filter 22.

The water stored in the first tank 11 is circulated and purified by the circulating water purification device 12 as described above to become purified water (purified water). The purified water is transferred from the purified water outlet 25 to the second tank 13 through the transfer water channel 26. The transfer water channel 26 is provided with a transfer pump 27.
The purified water stored in the second tank 13 is used as domestic water. The second tank 13 is provided with a water level sensor 28 for detecting an upper limit 281 and a lower limit 282 of the water level, and the transfer pump 27 is driven based on the detected water level of the water level sensor 28.

One of the features of this embodiment is that the time during which the ozone generator 24 does not operate is set in the circulating water purification apparatus 12. In other words, the circulation of water by the circulation pump 20 and the driving of the ozone generator 24 are not linked, and the circulation pump 20 is operating, but the time when the ozone generator 24 is not operating is actively installed. It is that.
In this way, the circulation pump 20 is operated to circulate the water in the first tank 11. At that time, the ozone generator 24 is not operated, and the water is circulated only by filtration with the manganese sand filter 21 and the activated carbon filter 22. By providing the time for performing the purification, manganese ions can be favorably adsorbed and removed by the manganese sand filter 21 as described above.

On the other hand, after the removal of manganese ions is promoted, the ozone generator 24 is operated, so that the ozone injected into the circulated water has the advantage that the manganese sand filter 21 is oxidized and regenerated.
The oxidation regeneration of manganese sand is as follows in terms of the reaction formula.

As an example, in the water treatment system shown in FIG. 1, when the ozone generator 24 is not operated and a period of 15 minutes during which ozone is not mixed into the circulated water is provided, and when the ozone is mixed while ozone is circulated. FIG. 2 shows a comparison of manganese removal performance.
From FIG. 2, when the water in the first tank 11 is circulated and purified by the circulating water purification device 12, only the manganese removal performance is observed. The manganese removal performance is better when the ozone generator 24 is not operated and ozone is not mixed. Can be confirmed to be good.

Referring back to FIG. 1, in this embodiment, in the circulating water purification apparatus 12, the ejector 23, the ozone generator 24, and the electrical control circuit 29 are housed in a housing 30. For this reason, the components in the housing 30 have an advantage that maintenance is easy.
The water treatment system 10 is further provided with a water quality sensor 31. The water quality sensor 31 is provided in the first tank 11 so as to detect the quality of the water stored in the first tank 11.

The water quality sensor 31 is provided for detecting the degree of circulation purification of the water circulated by the circulation type water purification device 12, in other words, the state of the manganese sand filter 21.
When the water quality sensor 31 detects a decrease in water quality, the ozone generator 24 is operated and the circulation pump 20 is operated to circulate the water in the first tank 11 without adding new raw water for a certain period of time. Thereby, the ozone mixed in the water regenerates the manganese sand filter 21.

That is, according to this embodiment, the manganese sand filter 21 can be regenerated without adding chlorine, sodium hypochlorite, or the like.
The water quality sensor 31 may be a turbidity meter, a color meter, a conductivity meter, a pH meter, or the like, and a color meter that detects the coloring of water by the manganese component when the manganese removal performance has deteriorated is used. This is desirable because it is easy to detect.

Instead of providing the water quality sensor 31, by manually measuring the manganese concentration of the water in the first tank 11, if the manganese concentration after the purification treatment is, for example, 0.1 mg / L or more, manganese sand It may be considered that the performance of the filter 21 is deteriorated and the operation signal is manually given so that the regeneration process of the deteriorated manganese sand is performed.
FIG. 3 is a block diagram showing an electrical configuration for controlling the water treatment apparatus shown in FIG.

  The control circuit 29 is supplied with the detected water level of the water level sensor 16, and the driving of the pumping pump 14 is controlled based on this detected water level. The control circuit 29 controls the operation of the circulation pump 20 and the ozone generator 24. Further, the detected water level of the water level sensor 28 of the second tank 13 is given to the control circuit 29, and the control circuit 29 controls the drive of the transfer pump 27 based on this detected water level.

Further, the detection signal of the water quality sensor 31 provided in the first tank 11 is given to the control circuit 29.
The control circuit 29 is provided with a counter 32, a timer 33, and the like for use in later-described control.
FIG. 4 is a flowchart showing a control operation executed by control circuit 29 shown in FIG. Next, the control operation of the water treatment system 10 according to this embodiment will be described according to the flow of FIG.

  When the control operation is started, the control circuit 29 first determines whether or not the first tank 11 is at the lower limit water level 162 (step S1). When the lower limit water level is reached, the pumping pump 14 is turned on (step S2). Thereby, since the water pumped up from the water source is accumulated in the first tank 11, it is then determined whether or not the water level of the first tank 11 is the upper limit water level (step S3).

When the first tank 11 reaches the upper limit water level, the counter for counting the number of treatments is incremented by 1 (step S4), and the pumping pump 14 is turned off (step S5).
If the first tank 11 is not the lower limit water level 162 in step S1, the pumping pump 14 is not turned on.
Next, after the pumping pump 14 is turned off, the circulation pump 20 is turned on (step S6). After the circulation pump 20 is turned on, it is determined whether or not a certain time has elapsed (step S7). If it is determined that the certain time has elapsed, the ozone generator 24 is turned on (step S8).

Thus, in this embodiment, there is a time difference in which a certain time elapses between the circulation pump 20 being turned on (step S6) and the ozone generator 24 being turned on (step S8).
This time difference (fixed time) is, for example, about 15 minutes to 60 minutes.
Next, both the circulation pump 20 and the ozone generator 24 are operated, and it is determined whether or not a predetermined time has elapsed for the water to be circulated and purified by the circulating water purification device 12 (step S9). When a predetermined time has elapsed, both the circulation pump 20 and the ozone generator 24 are turned off, and the purification of the water stored in the first tank 11 by the circulation water purification device 12 is finished (step S10).

Next, in this embodiment, it is determined whether or not the counter that counts the number of processes has counted a predetermined number N (step S11). Alternatively, instead of determining whether the number of counters is N, it is determined whether the water quality sensor 31 has detected a decrease in water quality (step S11).
And when it is counted by the counter that the number of purification processes has become N, or when the water quality sensor 31 detects a decrease in water quality, the water in the first tank 11 (purified water already purified) is used. In order to circulate again by the circulation type water purification device 12, the circulation pump 20 is turned on and the ozone generator 24 is turned on (step S12).

  When the circulation pump 20 is turned on and the ozone generator 24 is turned on, the purified water stored in the first tank 11 is circulated and purified again, and ozone is mixed into the water. Therefore, since ozone has almost no impurities or germs to be oxidized in the purified water, ozone in the water is mainly used to oxidize and regenerate manganese sand in the manganese sand filter 21. Thereby, reproduction | regeneration of the manganese sand filter 21 is performed.

Then, it is determined whether or not a predetermined time has elapsed for the regeneration of the manganese sand filter 21 (step S13). When the predetermined time has elapsed, the counter is cleared and the circulation pump 20 and the ozone generator 24 are turned off. (Step S14).
Then, the water level of the second tank 13 is determined based on the detected water level of the water level sensor 28 (step S15). If the second tank 13 is not the upper limit water level 281, the transfer pump 27 is turned on (step S16), and the upper limit water level 281 is reached. Then, the transfer pump 27 is turned off (step S17).

In the water treatment system 10 according to this embodiment, for example, about 50 L of water to be treated (raw water) per hour can be purified with one unit. Then, by transferring 50 L of purified water purified in one hour to the second tank 13 by the transfer pump 27, 1,200 L of purified water per day can be supplied as domestic water.
Depending on the quality of the water to be treated (raw water), about 50 L of water can be purified in 15 minutes, and in that case, 4,800 L of purified water can be supplied daily for daily use. .

Thus, according to the water treatment system 10 according to this embodiment, it is possible to realize purification of water suitable for domestic water and supply of purified water with a relatively simple configuration.
FIG. 5 is an illustrative view showing one example of a state of transition of water stored in the first tank 11 in the water treatment system 10.
Referring to FIG. 5, first, the first tank 11 is filled with water to be treated (raw water) (A). At this time, the amount of filled water is, for example, 225L. A circulation purification process is performed on the water by the circulation type water purification device 12. For example, when the treatment is performed for 2 hours, the water in the first tank 11 becomes purified water (B). Of the purified 225 L of water, for example, about 50 L of water is transferred to the second tank 13 by the transfer pump 27 (C).

Then, after about 50 L of water is transferred without transferring the entire amount, treated water (raw water) is added to the first tank 11 (D). The amount of raw water added is about 50 L corresponding to the amount transferred. Thereby, in the 1st tank 11, about 175L of purified water and 50L of raw water are mixed, and the water with little turbidity is filled (E).
And it will be in the purified state of (B) by purifying it with the circulating water purification apparatus 12 for about 15 to 30 minutes, for example.

In this way, the entire amount of water after purification in the first tank 11 is not transferred to the second tank 13, but less than half the amount is transferred, and raw water is additionally supplied to the next tank to perform the next purification. Further, the pH fluctuation is reduced, the treatment effect of the manganese sand filter 21 is improved, and the treatment time can be shortened (the treatment time can be shortened).
As shown in FIG. 5, instead of the configuration in which the purified water in the first tank 11 is partially transferred to the second tank 13, all the purified water in the first tank 11 is transferred to the second tank 13. Of course, a so-called batch processing system configured as described above is also possible.

  The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the claims.

It is a block diagram showing the whole water treatment system composition concerning one embodiment of this invention. It is the graph which compared the manganese removal performance with the case where ozone is mixed, and the case where it does not mix. It is a block diagram which shows the electrical structure for control of the water treatment apparatus shown in FIG. 4 is a flowchart showing a control operation executed by control circuit 29 shown in FIG. 3. 3 is an illustrative view showing one example of a state of transition of water stored in a first tank 11 in the water treatment system 10. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water treatment system 11 1st tank 12 Circulation type water purification apparatus 13 2nd tank 19 Circulation water path 20 Circulation pump 21 Manganese sand filter 23 Ejector 24 Ozone generator 29 Control circuit 31 Water quality sensor

Claims (6)

A first tank for storing water;
A circulating water purification device that pumps and purifies the water in the first tank and returns it to the first tank;
A water treatment system having a second tank for transferring and storing water in the first tank after being purified;
The circulating water purification device is
A circulation pump for pumping and circulating water;
A filter for removing impurities contained in the water by filtering the water circulated by the circulation pump;
An ozone treatment device for mixing ozone into the water after being filtered by the filter;
An ozone treatment delay control means for operating the ozone treatment device after a certain time has elapsed without operating the ozone treatment device for a certain time from the start of pumping out water in the first tank ;
The said filter contains the manganese sand filter for adsorbing and removing the manganese ion which used manganese sand for the filter medium, The water treatment system characterized by the above-mentioned. A process of storing water in the first tank, circulating and purifying the water in the first tank by the circulating water purification device, and transferring the water in the first tank after purification to the second tank is predetermined. After being performed a number of times, the purified water collected in the first tank is not transferred to the second tank, and manganese is circulated for a certain period of time while the ozone treatment device of the circulating water purification device is operated. and having a sand filter regeneration control means, the water treatment system of claim 1, wherein. A water quality detector for detecting the quality of the water in the first tank after the water storage in the first tank and the circulation purification of the water in the first tank by the circulation type water purification device;
Based on the detection output of the water quality detector, the purified water collected in the first tank is not transferred to the second tank, and the ozone treatment device of the circulating water purification device is operated for a certain period of time. manganese sand filter regeneration control means for circulating, and having a water treatment system of claim 1, wherein. The water treatment system according to claim 3 , wherein the water quality detector includes a measuring device that measures at least one of turbidity, chromaticity, total iron concentration, manganese concentration, conductivity, or pH of water. . A switching operation unit for switching whether or not to regenerate the manganese sand filter after water storage in the first tank and circulation purification of the water in the first tank by the circulation type water purification device;
In response to the switching operation of the switching operation unit, the purified water accumulated in the first tank is not transferred to the second tank, and is kept constant while the ozone treatment device of the circulating water purification device is operated. the water treatment system of claim 1, wherein the having the manganese sand filter regeneration controlling means for time circulation. A process of storing water in the first tank, circulating and purifying water in the first tank by the circulation type water purifier, and transferring the water in the first tank after purification to the second tank. In
Transferring a predetermined amount less than half of the water purified in the first tank to the second tank;
Thereafter, water to be treated is added to the first tank to fill the first tank with water,
Perform circulation purification of the water in the first tank by the circulation type water purification device,
2. The water treatment system according to claim 1, further comprising a sequence control unit that executes a sequence of transferring a predetermined amount less than half of the water in the first tank after being purified to the second tank. 3. .

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