JP4867415B2 - Filtration system and operating method thereof - Google Patents

Description

  The present invention relates to a filtration system for removing impurities such as non-dissolved substances contained in raw water with a filter medium and an operation method thereof.

  As a filtration system that removes impurities such as non-dissolved substances contained in raw water with filter media, for example, water obtained by removing iron as non-dissolved substances contained in groundwater is supplied as clean water or medium water. There is an iron removal system that removes iron and manganese, and there is a circulation type sand filtration system that removes non-dissolved materials such as dust by circulating water used in pools and baths. (For example, see Patent Documents 1 and 2).

The filtration system includes a filtering unit that removes non-dissolved substances contained in the raw water with a filter medium. The raw water is supplied to the filtering unit from a raw water line connected to the filtering unit, and the non-dissolved substance is removed by the filter medium. The water is captured and removed, and the water is collected from a treated water line connected to the filtering means.
JP-A-9-239361 JP 2002-1338 A

  By the way, the quality of raw water is not always constant and may fluctuate. Therefore, when the raw water quality deteriorates, impurities such as non-dissolved substances cannot be removed by the filter medium, and impurities may leak to the treated water side and the treated water quality may deteriorate. Conventionally, the quality of raw water is assumed to be deteriorated, or the amount of filter medium is sometimes set in consideration of the safety factor, but the cost is higher than necessary.

  This invention is made | formed in view of such a situation, The subject which it is going to solve is maintaining the quality of treated water, restraining cost.

This invention was made in order to solve the said subject, and invention of Claim 1 is a raw | natural water line, a treated water line, and the filtration means which removes the iron content or non-dissolved substance contained in raw | natural water with a filter medium. Is connected to the raw water line, and an oxidant addition means and / or a flocculant is added to the raw water supply line as a chemical injection means for removing iron or non-dissolved substances downstream of the raw water supply pump. A filtration system provided with a means for detecting the turbidity or chromaticity of raw water or treated water to which the chemical is added, and controlling the number of revolutions of the raw water supply pump. And a control means for controlling the flow rate adjusting means based on a detection result of the water quality detecting means.

  In the first aspect of the present invention, when the detection value by the water quality detection unit exceeds a predetermined turbidity or a predetermined chromaticity, the control unit reduces the supply flow rate of the raw water to the filtration unit. Control the adjusting means.

According to a second aspect of the present invention, when the supply flow rate of the raw water to the filtering means is reduced by the flow rate adjusting means based on the detection result of the water quality detecting means in the first aspect, the treated water is supplied from another system. A makeup water supply means for supplying makeup water comprising clean water or purified water is provided.

  In the invention according to claim 2, when the detection value by the water quality detection means exceeds a predetermined turbidity or a predetermined chromaticity and the flow rate adjustment means reduces the supply flow rate of the raw water to the filtration means, the flow rate is thereby reduced. The makeup water is supplied to the reduced treated water by the makeup water supply means.

  A third aspect of the present invention provides the filtering means according to the second aspect, further comprising: a treated water storage unit connected to a downstream side of the treated water line; and a water level detecting unit provided in the treated water storage unit. Supply of makeup water by the makeup water supply means when the supply flow rate of the raw water is reduced when the water level of the treated water storage unit detected by the water level detection means is below a predetermined makeup water level It is characterized by.

  According to a third aspect of the present invention, when the supply flow rate of the raw water to the filtering means is reduced and the water level in the treated water reservoir is below a predetermined makeup water level, the makeup water is supplied to the treated water. I do.

In the invention according to claim 4, a raw water line and a treated water line are connected to a filtering means for removing iron or non-dissolved substances contained in the raw water with a filter medium, and the raw water line includes a raw water supply pump, A method for operating a filtration system, wherein an oxidant addition means and / or a flocculant addition means is provided as a medicine injection means for use in removing iron or non-dissolved material downstream of a raw water supply pump , By detecting the turbidity or chromaticity of raw water or treated water to which chemicals are added, and controlling the number of revolutions of the raw water supply pump based on the detection result, the supply flow rate of the raw water to the filtering means is adjusted. It is characterized by doing.

  In a fourth aspect of the present invention, when the detected value of turbidity or chromaticity of raw water or treated water exceeds a predetermined turbidity or predetermined chromaticity, the supply flow rate of the raw water to the filtering means is reduced.

The invention according to claim 5 is the system according to claim 4, wherein when the supply flow rate of the raw water to the filtering means is reduced based on the detection result of the turbidity or chromaticity of the raw water or the treated water, the system is separated from the treated water. It is characterized by supplying makeup water consisting of clean water or purified water .

  In the fifth aspect of the present invention, when the detected value of turbidity or chromaticity of raw water or treated water exceeds a predetermined turbidity or predetermined chromaticity and the supply flow rate of raw water to the filtering means is reduced, the flow rate is thereby increased. Supply replenished water to treated water that has decreased.

  Further, the invention according to claim 6 is the invention according to claim 5, wherein supply of makeup water to treated water when the supply flow rate of raw water to the filtering means is reduced is connected to the downstream side of the treated water line. It is performed when the water level of the treated water storage section is below a predetermined makeup water level.

  According to a sixth aspect of the present invention, when the supply flow rate of the raw water to the filtering means is reduced and the water level in the treated water reservoir is below a predetermined makeup water level, the makeup water is supplied to the treated water. I do.

  According to invention of Claim 1, 4, when the detected value of turbidity or chromaticity of raw water or treated water exceeds a predetermined turbidity or predetermined chromaticity, the supply flow rate of the raw water to the filtering means is By reducing the flow rate below the set flow rate, impurities such as non-dissolved substances can be sufficiently removed by the filter medium. Thereby, even when the raw water quality deteriorates, the treated water quality can be maintained, and it is necessary to assume the deterioration of the raw water quality or to set the amount of the filter medium in consideration of the safety factor. And cost can be reduced.

  According to the second and fifth aspects of the present invention, even when the treated water flow rate is reduced by reducing the supply flow rate of the raw water to the filtering means, makeup water such as clean water or purified water is supplied to the treated water. Since it is supplied, the required amount of treated water can be secured while maintaining the quality of the treated water.

  According to the third and sixth aspects of the invention, in order to maintain the quality of the treated water, even when the supply flow rate of the raw water to the filtering means is reduced, the water level in the treated water reservoir is a predetermined makeup water level. Since the supply of makeup water to the treated water is not performed when the amount of water is exceeded, the use of makeup water can be suppressed while securing a necessary amount of treated water, and the cost can be reduced.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described. FIG. 1 is a schematic explanatory view showing the configuration of the first embodiment of the filtration system according to the present invention.

  A filtration system 1 shown in FIG. 1 includes a filtration means 2, a raw water line 3 that supplies raw water to the filtration means 2, and a treated water line 4 that collects treated water from the filtration means 2.

  The filtration means 2 is a means for removing iron contained in the raw water as an impurity such as an undissolved substance, and the filtration system 1 of the first embodiment is an iron removal system. The filtration means 2 includes a tower-type filtration unit 5 that performs filtration with a filter medium layer (not shown) formed of anthracite, filtration sand, and the like, and a control valve 6. Here, the filtering means 2 may be provided with a manganese removal capability by adding manganese zeolite or the like into the filter medium layer.

  The raw water line 3 and the treated water line 4 are connected to the control valve 6, and the raw water supplied to the filtration unit 5 through the control valve 6 is filtered and included in the raw water. Iron is removed, and this water flows through the control valve 6 to the treated water line 4.

  The raw water line 3 is provided with a raw water supply pump 7. The raw water supply pump 7 also serves as a flow rate adjusting means for adjusting the supply flow rate of the raw water to the filtering means 2. Furthermore, an oxidant addition means 8 and a flocculant addition means 9 are connected to the raw water line 3 downstream of the raw water supply pump 7 as chemical injection means for use in removing impurities. The water quality detection means 10 is connected to the downstream side.

The oxidant addition means 8 includes an oxidant reservoir 12 connected to the raw water line 3 via an oxidant supply line 11. In this oxidant storage part 12, sodium hypochlorite is stored as an oxidant, and iron contained in the raw water is oxidized by this sodium hypochlorite to insoluble ferric hydroxide (Fe ( OH) ₃ ), and this ferric hydroxide is removed by the filtering means 2.

  The sodium hypochlorite is added to the raw water line 3 by an oxidant supply pump 13 provided in the oxidant supply line 11. Here, the amount of sodium hypochlorite added is such that when the raw water quality deteriorates, the water quality detection means 10 can detect an increase in turbidity or chromaticity of the raw water, as will be described later. Is set to

  The flocculant adding means 9 includes a flocculant reservoir 15 connected to the raw water line 3 through a flocculant supply line 14. The flocculant stored in the flocculant reservoir 15 is added to the raw water line 3 by the flocculant supply pump 16 provided in the flocculant supply line 14.

  The water quality detection means 10 detects the turbidity or chromaticity of the raw water flowing downstream from the oxidant addition means 8 and is connected to the raw water line 3 via the sample liquid introduction line 17. The water quality detection means 10 is an optical measuring device described in Japanese Patent Application No. 2005-347405, for example. Although not shown in the drawing for the detailed configuration of this optical measuring device, the light from the light emitting element is irradiated to the sample liquid in the measurement chamber provided in the measurement cell through the first light guide unit, and the light from the sample liquid is also emitted. An optical measurement device that detects light with a light receiving element through a second light guide, the flow channel being formed in the measurement cell and introducing a sample liquid into or out of the measurement chamber, and the measurement cell And a flow control unit that opens and closes the flow channel unit, and a filter unit that is connected to the measurement cell and communicates with the measurement chamber. By configuring in this way, it is possible to realize a compact optical measurement device in which a sample liquid collection mechanism and a cleaning liquid generation mechanism for cleaning the light transmission window in each light guide unit are integrated. Further, it is possible to realize an optical measuring device that can perform nozzle cleaning without reducing the supply pressure of the cleaning liquid. As a result, it is possible to perform installation and maintenance in the field in a short time, and furthermore, it is possible to effectively remove the dirt component adhering to the light transmission window and maintain a predetermined measurement concentration. It has become.

  A treated water reservoir 19 having a water level sensor 18 is connected to the downstream side of the treated water line 4. Further, a treated water distribution line 20 is connected to the treated water storage unit 19.

  The treated water storage unit 19 can be supplied with makeup water such as clean water and purified water from another system by the makeup water supply means 21. The makeup water supply means 21 includes a makeup water supply line 22 connected to the treated water reservoir 19 and a makeup water supply valve 23 provided in the makeup water supply line 22.

  The raw water supply pump 7, the water quality detection means 10, the oxidant supply pump 13, the coagulant supply pump 16, the water level sensor 18 and the makeup water supply valve 23 are controlled via signal lines 24, 24,. Connected with means 25. The control means 25 is based on the signal input from the water quality detection means 10 or the water level sensor 18 via the signal line 24, and the raw water supply pump 7, the oxidant supply pump 13, the flocculant supply pump. 16 and the makeup water supply valve 23 are controlled.

  In the filtration system 1, when the water level sensor 18 detects that the water level in the treated water storage unit 19 is equal to or lower than a predetermined water supply start water level, the control means 25 causes the raw water supply pump to 7 is operated to supply raw water to the filtering means 2 at a predetermined set flow rate. At this time, the control means 25 also operates the oxidant supply pump 13 and the flocculant supply pump 16 to operate sodium hypochlorite in the oxidant reservoir 12 and the flocculant reservoir 15. A flocculant is added to the raw water line 3.

  When sodium hypochlorite is added to the raw water line 3, iron in the raw water is oxidized to form insoluble ferric hydroxide. Then, when raw water in which ferric hydroxide is agglomerated by the flocculant flows into the filtration unit 5 through the control valve 6, ferric hydroxide is captured by the filter medium layer (not shown). The water is removed and flows out to the treated water line 4 through the control valve 6. The treated water that has flowed out to the treated water line 4 is stored in the treated water storage unit 19.

  During operation of the filtration system 1, turbidity or chromaticity is detected by the water quality detection means 10, and the detection result is input to the control means 25 through the signal line 24. The control means 25 controls the raw water supply pump 7 based on the detection result of the water quality detection means 10. Specifically, when the detection value of the water quality detection means 10 is equal to or less than a predetermined turbidity or a predetermined chromaticity, the control means 25 indicates that the supply flow rate of raw water to the filtration means 2 is the set flow rate. Thus, the raw water supply pump 7 is controlled. On the other hand, when the detection value of the water quality detection means 10 exceeds a predetermined turbidity or a predetermined chromaticity, the control means 25 reduces the supply flow rate of raw water to the filtration means 2 below the set flow rate. The raw water supply pump 7 is controlled.

  When the raw water supply flow rate to the filtering means 2 is reduced by the raw water supply pump 7, the control means 25 opens the makeup water supply valve 23 and opens the treated water reservoir 19 from the makeup water supply line 22. Supply makeup water to

  Here, when the supply flow rate of the raw water to the filtration means 2 is reduced, the supply level of the makeup water to the treated water reservoir 19 is determined by the water level of the treated water reservoir 19 detected by the water level sensor 18. You may perform only when it is below a predetermined makeup water level. Thereby, when the water level of the treated water storage unit 19 exceeds a predetermined makeup water level, the supply of makeup water to the treated water storage unit 19 is not performed, so that the necessary amount of treated water is secured. The use of makeup water can be suppressed, and the cost can be reduced.

  When the water level in the treated water storage unit 19 reaches a predetermined water supply stop water level, the control means 25 stops the raw water supply pump 7 and supplies the makeup water supply valve 23 when the makeup water supply valve 23 is open. The water supply valve 23 is closed.

  According to the filtration system 1, when the detection value of the water quality detection means 10 exceeds a predetermined turbidity or a predetermined chromaticity, by reducing the supply flow rate of raw water to the filtration means 2 from the set flow rate, Iron can be sufficiently removed by the filter medium layer. Thereby, even when the raw water quality deteriorates, the treated water quality can be maintained, and it is necessary to assume the deterioration of the raw water quality or to set the amount of the filter medium in consideration of the safety factor. And cost can be reduced.

  Further, even when the detected value by the water quality detection means 10 exceeds a predetermined turbidity or a predetermined chromaticity and the raw water supply flow rate to the filtration means 2 is reduced, thereby reducing the treated water flow rate, the replenishment Since the makeup water is supplied to the treated water by the water supply means 21, a necessary amount of treated water can be secured while maintaining the treated water quality.

  Here, a modification of the first embodiment will be described. In the first embodiment, the filtration system 1 is an iron removal system in which the filtration means 2 is an iron removal means. However, the filtration system 1 is a sand filter that removes dust and the like from the filtration means 2. It may be a sand filtration system as a means. In this case, the filtration unit 5 is configured to perform filtration with a filter medium layer (not shown) formed of anthracite, filtration sand, or the like.

  In this modified example, the flocculant added by the flocculant adding means 9 causes dust or the like in raw water to aggregate, and the aggregate is removed by the filter medium layer. Here, in this sand filtration system, since it is not necessary to oxidize the iron content in the raw water, it is not necessary to provide the oxidizing agent adding means 8, but the raw water supplied to the filtering means 2 is sodium hypochlorite. In order to sterilize with a sterilizing agent such as a sterilizing agent, a sterilizing agent adding unit including a sterilizing agent reservoir, a sterilizing agent supply pump, and a sterilizing agent supply line (not shown) is provided at the position of the oxidizing agent adding unit 8.

(Second embodiment)
Next, a second embodiment of the present invention will be described. FIG. 2 is a schematic explanatory view showing the configuration of the second embodiment of the filtration system according to the present invention. In FIG. 2, the same components as those of the filtration system 1 of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The filtration system 30 shown in FIG. 2 is a circulation type sand filtration system that circulates water in a water use part 31 such as a pool or a bathhouse, and the raw water line 3 and the treated water line connected to the filtration means 2. 4 is connected to the water use part 31, and the raw water line 3 and the treated water line 4 constitute a circulation line 32 for circulating the water of the water use part 31.

  In the filtration system 30, the filtration means 2 is a sand filtration means as in the modification of the first embodiment. Further, in order to sterilize the raw water supplied to the filtering means 2 with a sterilizing agent, a sterilizing agent storage unit 33 in which sodium hypochlorite is stored as a sterilizing agent, a sterilizing agent supply pump 34, a sterilizing agent supply line 35, Is provided in place of the oxidizing agent adding means 8. Here, the sterilizing agent supply pump 34 is connected to the control means 25 via the signal line 24, similarly to the oxidant supply pump 13.

  In the filtration system 30, when the operation start time set by a timer (not shown) is reached, the control unit 25 operates the raw water supply pump 7 to supply the raw water to the filtration means 2 at a predetermined set flow rate. To do. At this time, the control means 25 operates the sterilizing agent supply pump 35 and the flocculating agent supply pump 16, so that sodium hypochlorite in the sterilizing agent storage unit 33 and the flocculating agent storage unit 15 A flocculant is added to the raw water line 3.

  Then, when raw water in which dust and the like are aggregated by the addition of the flocculant flows into the filtration unit 5 through the control valve 6, dust and the like are captured and removed by the filter medium layer (not shown). Water flows out to the treated water line 4 through the control valve 6. The treated water that has flowed out to the treated water line 4 flows into the water use section 31.

  Also in the filtration system 30, as in the first embodiment, the control unit 25 controls the raw water supply pump 7 based on the detection result of the water quality detection unit 10 and detects the water quality detection unit 10. When the value exceeds a predetermined turbidity or a predetermined chromaticity, the raw water supply pump 7 is controlled so as to reduce the supply flow rate of the raw water to the filtering means 2 from the set flow rate. However, the filtration system 30 of this second embodiment does not include the makeup water supply means 21, and even when the supply flow rate of the raw water to the filtration means 2 is reduced, the water use section 31. Supply water such as clean water and clean water is not supplied.

  Even with the filtration system 30 as described above, the quality of the treated water can be maintained while reducing costs, as in the first embodiment.

  As mentioned above, although this invention was demonstrated based on each said embodiment, this invention is not restricted to the said embodiment of course. For example, the water quality detection means 10 may be connected to the treated water line 4. Further, the control means 25 may control the raw water supply pump 7 so as to vary the supply flow rate of the raw water to the filtration means 2 according to the detection value of the water quality detection means 10. In this case, the control means 25 controls the raw water supply pump 7 so as to decrease the supply flow rate of the raw water to the filtration means 2 as the turbidity or chromaticity decreases.

It is a schematic explanatory drawing which shows the structure of 1st embodiment of the filtration system which concerns on this invention. It is a schematic explanatory drawing which shows the structure of 2nd embodiment of the filtration system which concerns on this invention.

Explanation of symbols

1,30 Filtration system 2 Filtration means 3 Raw water line 4 Treated water line 7 Raw water supply pump (flow rate adjustment means)
8 Oxidizing agent addition means (medicine injection means)
9 Flocculant addition means (drug injection means)
10 Water quality detection means 18 Water level sensor (water level detection means)
19 treated water storage unit 21 makeup water supply means 25 control means

Claims (6)

A raw water line and a treated water line are connected to a filtering means for removing iron or non-dissolved substances contained in the raw water with a filter medium. The raw water line is connected to a raw water supply pump and an iron component downstream of the raw water supply pump. Or a filtration system provided with an oxidant addition means and / or a flocculant addition means as a medicine injection means for use in removing undissolved substances ,
Turbidity or chromaticity water quality detecting means to which the chemical is added, and flow rate adjusting means for adjusting the supply flow rate of the raw water to the filtering means by controlling the rotational speed of the raw water supply pump. And a control means for controlling the flow rate adjusting means based on the detection result of the water quality detecting means. Based on the detection result of the water quality detection means, when the supply flow rate of the raw water to the filtration means is reduced by the flow rate adjustment means, supply water for supplying makeup water consisting of clean water or purified water from another system to the treated water The filtration system according to claim 1, further comprising a supply unit.   The replenishing water when the treated water storage section connected to the downstream side of the treated water line and the water level detecting means provided in the treated water storage section, and the supply flow rate of raw water to the filtering means is reduced The filtration system according to claim 2, wherein supply of makeup water by the supply means is performed when the water level of the treated water storage section detected by the water level detection means is equal to or lower than a predetermined makeup water level. A raw water line and a treated water line are connected to a filtering means for removing iron or non-dissolved substances contained in the raw water with a filter medium. The raw water line is connected to a raw water supply pump and an iron component downstream of the raw water supply pump. Or an operation method of a filtration system provided with an oxidant addition means and / or a flocculant addition means as a medicine injection means for use in removing undissolved substances ,
By detecting the turbidity or chromaticity of the raw water or treated water to which the chemical has been added, and controlling the number of rotations of the raw water supply pump based on the detection result, the supply flow rate of the raw water to the filtration means is reduced. A method of operating a filtration system, characterized by adjusting. Based on the detection result of turbidity or chromaticity of raw water or treated water, supply water made up of clean water or purified water from another system is supplied to the treated water when the raw water supply flow rate to the filtration means is reduced. The method for operating a filtration system according to claim 4.   When supplying the makeup water to the treated water when the supply flow rate of the raw water to the filtering means is reduced, the water level of the treated water storage unit connected to the downstream side of the treated water line is below a predetermined makeup water level The method for operating a filtration system according to claim 5, wherein

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