JP2011062576A - Method and system for reusing alkaline electrolytic water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reusing method capable of making an alkaline electrolytic water used for washing articles into a reusable state; and to provide a system capable of reusing the alkaline electrolytic water. <P>SOLUTION: The used alkaline electrolytic water used for washing is introduced to a membrane processing apparatus 30 in order to effectively reuse the alkaline electrolytic water as washing water while maintaining constant washing power, thereby, processing oil or the like is removed by a filtration membrane, thereafter, the used alkaline electrolytic water from which the processing oil or the like is removed is introduced again to an electrolyzer 10, is subjected to electrodialysis, is regenerated and is reused. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a method and system for reusing alkaline electrolyzed water generated using an electrolyzed water generator, and more specifically, alkaline electrolyzed water used for cleaning articles can be reused. The present invention relates to a reusable method for making a new state and a system that enables reusability.

  Conventionally, wash water mixed with oil is discarded after it has been separated into the river, or if there is no separation processing device, ask the industrial waste disposal for industrial waste. As a result, processing costs were incurred.

  Therefore, when alkaline electrolyzed water is used as a cleaning liquid, the parts to which oil has adhered are cleaned, and then the used alkaline electrolyzed water that has been cleaned is collected and filtered with a filter member as a cleaning liquid purification means. Thus, a parts cleaning apparatus configured to circulate and use alkaline electrolyzed water has been developed, and this is disclosed in Patent Document 1 as a prior art.

JP 2009-101264 A

  However, as described above, the parts cleaning apparatus described in Patent Document 1 recovers alkaline electrolyzed water used as a cleaning liquid as described above after being recovered and filtered through a filter member. Electrolyzed water gradually deteriorates every time it is used, and the detergency declines. If repeated use by oil filtration is repeated as it is, there is a problem that a cleaning defect occurs before it is noticed.

  Moreover, in order to avoid the deterioration of the cleaning power, it is necessary to frequently replace the alkaline electrolyzed water, which causes a problem that the running cost increases.

  Therefore, the technical problem of the present invention is to provide a method and system for reusing alkaline electrolyzed water that makes it possible to effectively recycle alkaline electrolyzed water as wash water while maintaining a constant detergency. It is.

(1) In order to solve the above technical problem, the method for reusing alkaline electrolyzed water according to claim 1 of the present invention is that the used alkaline electrolyzed water used for cleaning various articles, processing oil, etc. It is characterized in that after the oil is removed and filtered, this used alkaline electrolyzed water is introduced into the electrolyzer and electrolyzed again so that the used alkaline electrolyzed water can be reused as washing water. .

(2) Moreover, the reuse method of alkaline electrolyzed water according to claim 2 of the present invention mixes spent alkaline electrolyzed water and raw water, which have been filtered after removing oil such as processing oil, in a mixing tank. It is characterized in that the used alkaline electrolyzed water can be reused as washing water by introducing mixed water into the electrolytic cell and electrolyzing again.

(3) Moreover, the alkaline electrolyzed water reuse system according to claim 3 of the present invention recycles the alkaline electrolyzed water that makes the used alkaline electrolyzed water used for washing various articles usable for washing again. The system is a cleaning means that uses alkaline electrolyzed water generated in an electrolytic cell to clean and remove dirt substances containing oil such as processing oil adhering to various articles, and is removed by cleaning A membrane treatment means for separating and removing the soiled substance from the used alkaline electrolyzed water containing the soiled substance using a filtration membrane, and the used alkaline electrolyzed water from which the soiled substance has been removed are sent again to the electrolytic cell. And re-electrolytic treatment means for performing electrolytic treatment.

(4) Moreover, the alkaline electrolyzed water recycling system according to claim 4 of the present invention is a used alkaline electrolyzed electrolyte that is sent through the membrane treatment means in the middle of a water supply path for introducing raw water into the electrolytic cell. Water and the above raw water are mixed to form electrolyzed water, and a mixing tank capable of repeating electrolysis by feeding the electrolyzed water into the electrolytic tank is provided.

(5) Further, in the alkaline electrolyzed water recycling system according to claim 5 of the present invention, the pore size of the filtration membrane used in the membrane treatment means collects and separates and removes oil components such as processing oil. Is characterized in that it is configured to have a thickness of 0.005 to 0.01 μm.

(6) Moreover, the alkaline electrolyzed water recycling system according to claim 6 of the present invention is characterized in that the membrane treatment means is configured to perform by a cross flow method using an ultrafiltration membrane. Yes.

(7) Moreover, the alkaline electrolyzed water reuse system according to claim 7 of the present invention is measured by electrical conductivity measuring means for measuring the electrical conductivity of the electrolyzed water supplied to the electrolyzer. Control means is provided that can control the amount of raw water supplied to the mixing tank or the amount of electrolyte supplied according to the electrical conductivity.

(8) Furthermore, the alkaline electrolyzed water reuse system according to claim 8 of the present invention measures an electrolysis voltage and an electrolysis current as the electrical conductivity measuring means, and the electrical conductivity is measured from these measured values. It is characterized in that a measuring means for converting is used.

  According to each means concerning Claim 1, 2, 3, 4 described in said (1), (2), (3), (4), by wash | cleaning various articles | goods using alkaline electrolyzed water. It is possible to degrease and clean processing oil and the like adhering to various articles. In addition, the used alkaline electrolyzed water used for cleaning is filtered after removing oils such as mixed processing oil, and then used alkaline electrolyzed water or a mixture obtained by mixing raw water with this alkaline electrolyzed water. Electrolyzed water is reintroduced into the electrolytic cell and electrolysis is performed in a relatively short time, maintaining a constant detergency without increasing running costs and degrading the detergency of alkaline electrolyzed water The alkaline electrolyzed water can be repeatedly used for cleaning.

  According to the means according to claim 5 described in the above (5), the pore diameter of the filtration membrane allows the electrolyte to permeate, but collects oil such as processing oil. By using the treatment device, oil such as processing oil is separated and removed from the used alkaline electrolyzed water, so that the used alkaline electrolyzed water can be reused.

  According to the means according to claim 6 described in the above (6), since the oil particles are extremely small, the cross-flow method using an ultrafiltration membrane is effectively used for filtration. In addition, since the cross flow method is less likely to block the pores of the filtration membrane, the alkaline electrolyzed water is repeatedly circulated over a long period of time to sufficiently filter the oil and the amount of waste water of the alkaline electrolyzed water. Can be reduced.

  According to the means concerning Claim 7 described in said (7), in order to produce | generate alkaline electrolyzed water of suitable pH, electrical conductivity is measured and the supply_amount | feed_rate of raw | natural water and electrolyte is controlled. Since the electrical conductivity is determined by the amount of electrolyte mixed in, the electrical conductivity of the supply water (electrolyzed water) supplied from the mixing tank to the electrolytic tank is measured, and if raw water or electrolyte is supplied to the mixing tank according to the measurement result, Even if the electrolyte content of the recovered alkaline electrolyzed water is indeterminate, the electroconductivity is measured and adjusted, so that electrolyzed water having an appropriate pH is generated to always obtain a suitable alkaline electrolyzed water for cleaning. be able to.

  According to the means according to claim 8 described in (8) above, there is a certain correlation between electric conductivity, electrolysis voltage and electrolysis current, and these correlations can be stored in the memory in the control unit. For example, the electric conduction value can be converted by measuring the voltage and current. Therefore, the electrical conductivity can be measured without using an expensive electrical conductivity meter.

  As described above, according to the method and system for reusing alkaline electrolyzed water according to the present invention, it is possible to perform again by performing electrolysis again without discarding used alkaline electrolyzed water from which processing oil or the like has been removed. Since it can be used for degreasing and washing of processing oil, etc., it can greatly reduce the cost of washing with alkaline electrolyzed water, and it can also reduce the cost of disposal of alkaline electrolyzed water mixed with oil. It can be demonstrated.

The block diagram explaining the whole reuse system of alkaline electrolyzed water which concerns on this invention. The graph which showed the relationship between the pore diameter of a filtration membrane, the normal hexane extract value, and the density | concentration of potassium carbonate. The graph which showed the relationship between pH of alkaline electrolyzed water, and electrical conductivity. Explanatory drawing explaining the structure of the crossflow system. The block diagram explaining the electrical constitution of the present invention. The block diagram explaining the structure of the re-electrolytic cleaning system implement | achieved by CPU.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for reusing alkaline electrolyzed water according to the present invention and an embodiment of the system will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating the overall configuration of the system according to the present invention. Is a mixing tank, and raw water which is tap water is supplied to the mixing tank 1 through a water supply pipe H1, and the used alkaline electrolyzed water from which the oil after washing is further removed and the electrolytic tank 10 The acidic electrolyzed water as the anode water generated in the anode chamber 10A is supplied and mixed through the circulation pipe H5 and the water supply pipe H2, respectively.

  The electrolytic cell 10 can generate alkaline electrolyzed water for washing and acidic electrolyzed water using a known production method, for example, in JP-A-2002-361253, and the inside of the electrolytic cell 10 is separated by a diaphragm 10T. The anode chamber 10A having the anode 10C and the cathode chamber 10B having the cathode 10D are partitioned, and anodic electrolyzed water is generated in the anode chamber 10A by electrolysis, and there is a cleaning effect in the cathode chamber 10B. It has a mechanism in which alkaline electrolyzed water (cathode electrolyzed water) is generated.

  In order to generate alkaline electrolyzed water that is washing water, first, raw water, used alkaline electrolyzed water and, if necessary, anodic electrolyzed water (acidic electrolyzed water) from the mixing tank 1 through the introduction pipe H3 by operating the pump P1. When the flow rate detection sensor S provided in the introduction pipe H3 detects water entry, the electrodes 10C and 10D in the electrolytic cell 10 are energized to start electrolysis.

  The electric conductivity during electrolysis is measured by electrolysis voltage and current, that is, by an AV meter 11X (A is an ammeter, V is a voltmeter) inside the electrolyzed water generating device XZ surrounded by a two-dot chain line in FIG. Capture by. The electrical conductivity is proportional to the concentration of the electrolyte, and as the electrical conductivity increases, the electrolytic current increases and the properties of the generated electrolytic water change. Since the electrolysis voltage and current are related to the electrical conductivity depending on the device, the correlation measured in advance is stored as data in the memory of the control device. When generating electrolyzed water, the electrolysis voltage and current are measured, the electric conductivity is captured based on the results, and the solution of potassium carbonate, which is an electrolyte, is used by the pump P2 so that the electroconductivity of the electrolyzed water becomes an appropriate value. Is supplied to the electrolytic cell 10 from the electrolytic cell 2 through the introduction pipes H4 and H3. When the electrical conductivity is higher than an appropriate value, the supply of electrolyte by the pump P2 is stopped.

  The reason why potassium carbonate is used as an electrolyte in the examples is to prevent rust from being generated when cleaning metals, and salt that does not corrode like plastic may be used as an electrolyte. In addition, since potassium carbonate is alkaline, the pH of the cathode water is easily increased by electrolysis, so that it is effective as an electrolyte during washing for the purpose of removing oil.

  Further, since potassium carbonate, which is an electrolyte, is deposited in the form of fine particles at the bottom of the electrolyte tank 12, a water channel opening / closing valve V1 provided in the middle of the branch pipe H6 of the water supply pipe H1 by detecting the low level sensor FL1. Is automatically opened and the raw water is fed to the electrolyte tank 12 to be dissolved, so that it can be fed as a saturated solution at all times, and is fed by the pump P2 in accordance with a command from the control unit 50. Then, when the level sensor FL1 detects a high level, the water channel open / close valve V1 is closed, and water supply from the branch pipe H6 is stopped.

  The alkaline electrolyzed water generated as described above is sent to the cleaning tank 20 of the cleaning device through the supply pipe 21. The cleaning device is provided with a bag for storing articles for removing attached processing oil and the like, a shower, a heating device for alkaline electrolyzed water, and the like, which are omitted in the figure. As removal means for processing oil or the like, there are a dipping method and a method of performing a shower suspended from the upper part of the cleaning tank 20. FL4 is a sensor for detecting the amount of alkaline electrolyzed water in the cleaning tank 20, and a drain pipe 22 for filtration and recovery is attached to the cleaning tank 20.

  A drain pipe 22 from the cleaning tank 20 is connected to a membrane treatment device 30 as a filtration device by a pump P3 through a check valve 23. The used alkaline electrolyzed water mixed with processing oil or the like is collected in the mixing tank 1 through the ring pipe H5 after the oil OL shown in FIG. Further, since the oil component OL in the alkaline electrolyzed water cannot be removed once, the recovery rate is set to 90%, and the opening degree of the first flow rate control valve 32 and the second flow rate control valve 33 in FIG. 1 is set to 1: 9. After adjustment, 90% of the unfiltered water passes through the second flow rate control valve 33 after passing through the drain pipe 30T, and is returned to the membrane treatment apparatus by the pump P3 through the circulation pipe 30B and filtered. 10% of unfiltered water passes through the wastewater pipe 30A and is discharged. The reason for draining 10% of unfiltered water is that alkaline electrolyzed water is rapidly concentrated and there is a high risk of clogging the membrane, so that a certain amount must always be drained.

  In FIG. 1, the continuous filtration method has been described, but there are other batch methods, and the batch method stores alkaline electrolyzed water mixed with processing oil or the like from the cleaning tank 20 in a temporary storage tank (not shown). In this case, the concentrated liquid after filtration is stored in the temporary water storage tank and is collectively fed to the drain waste water tank 40. In the case of a batch type, it is necessary to perform the filtration operation repeatedly at regular intervals.

  In the case of the continuous filtration method, the filtration operation is usually performed continuously during the cleaning operation, but may be performed after the cleaning when the amount of cleaning is small. In the case of the batch type, the time for filtration and the interval until the next filtration can be set in advance and automatically repeated. Furthermore, the level sensor FL5 of the drain wastewater tank 40 detects when the wastewater in the tank 40 is full, and as a result, issues an alarm to notify.

  FIG. 2 is a graph showing the relationship between the pore size of a filter membrane (filter) from which oil OL can be removed based on experiments, the normal hexane extract value (n-Hex concentration), and the potassium carbonate concentration. The normal hexane extract value is used as an index representing “oil content” in water. For example, the Water Pollution Control Law stipulates that the limit that can be discarded in a river is 5 mg / l or less. A broken line indicated by a dotted line is a graph in which processing oil is added to alkaline electrolyzed water, the normal hexane extract value is set to 412 mg / l, and oil is filtered through various types of filter membranes. It was found that the oil content could not be passed when the fine mesh was 01 μm or less.

  Moreover, the broken line shown by the solid line is a graph showing the relationship between the pore size of the filtration membrane when 0.30% of potassium carbonate is dissolved in alkaline electrolyzed water and the permeation concentration of potassium carbonate (K2CO3) after passing through the filtration membrane. is there. It can be seen that potassium carbonate permeates up to a pore size of 0.005 μm, it is difficult to permeate when the pore size is less than 0.005 μm, and hardly permeates at 0.0005 μm.

  Therefore, it can be seen that the pore size of the filtration membrane that can remove oil OL and permeate potassium carbonate is 0.005 to 0.01 μm. By the way, when sodium chloride was used as the electrolyte, the degree of permeation was the same.

  FIG. 3 shows the relationship between the pH of the alkaline electrolyzed water by the experimental apparatus of the example and the electrical conductivity. According to this graph, the maximum pH is 11 when the electrical conductivity is 150 mS / m. .5. Therefore, it is shown that the electrical conductivity may be controlled to this value by supplying raw water or injecting an electrolyte. If the allowable pH value is in the range of pH 11.0 or more, the electrical conductivity corresponds to 30 to 400 mS / m.

  The electric conductivity can be obtained by measuring the electrolysis voltage and the electrolysis current, and the electric conductivity at that time can be obtained from both of these numerical values. The electric conductivity is a specific value determined by the capacity of the power supply circuit 11Y (see FIG. 1) used in the electrolyzed water generator XZ and the structure of the electrolyzer 10, but the tendency is the same for all apparatuses and is determined by experiments. The obtained voltage and current are stored in the memory 52 (see FIG. 5) in the control unit 50, and the electric conductivity is converted and used.

  FIG. 4 is a schematic explanatory view of a membrane treatment apparatus 30 as a membrane treatment means configured in a cross flow system using an ultrafiltration membrane as the filtration membrane 31, and alkaline electrolysis in which oil OL is mixed in the filtration membrane 31. When water is pressurized and injected with the pump P3, a portion of the alkaline electrolyzed water permeates through the filtration membrane 31 to become permeated water, which is recovered in the mixing tank 1 and reused. The removed oil OL is taken into the remaining alkaline electrolyzed water, and is discharged as residual water without blocking the pores of the filtration membrane 31 and accumulating. In the present invention, this residual water can be circulated many times to obtain permeated water. Moreover, the residual water concentrated by circulation filtration is finally treated as waste water as concentrated water. There are a hollow fiber type, a spiral type, and a tubular type in the form of the filtration membrane 31, and in the implementation, a necessary one is selected and used.

  FIG. 5 is a block diagram illustrating the electrical configuration of the present invention. The control unit generally indicated by reference numeral 50 includes a CPU 51 and a memory 52, and a bus 53 is provided between the CPU 51 and the memory 52. In addition to the display unit 55, the input unit 56, the clock circuit 57, and the alarm unit 58, the interface 54 connected via the AV meter 11X including the ammeter and voltmeter described above, and various water channel opening / closing valves V1 to V1. V2, various pumps P1 to P3, and various level sensors FL1 to FL5 are connected, and each is configured to be controlled and operated by the CPU 51 in accordance with a program stored in the memory 52.

  More specifically, the display unit 55 described above displays the detection status of each level sensor, electrical conductivity, pH, timer, and the like, and the input unit 56 inputs the filtration time and the like. The memory 52 stores the relationship between pH and electric conductivity of alkaline electrolyzed water and the relationship between electrolysis voltage / current and electric conductivity, and a program for controlling these. The clock circuit 57 measures the filtration time and the electrolysis time, and the alarm unit 58 notifies the operator when various operations are abnormal.

  FIG. 6 is a block diagram showing a configuration of a reuse system realized by the CPU 51 of the control unit 50, and the setting reading unit 51A inputs a set value such as a filtration time and an optimum electrical conductivity. The raw water supply amount adjusting unit 51B opens and closes the water channel opening / closing valve V2 to supply raw water when the amount of water in the mixing tank 1 decreases or when the electrical conductivity is higher than a set value. When 1 is full or the electrical conductivity is lower than the set value, it stops.

  Furthermore, the electrolyte supply amount adjusting unit 51C is configured to keep the electrolyte in a saturated state as described above and to send the electrolyte to the electrolyzed water generating device XZ when the electric conductivity is lower than an appropriate value by the pump P2. The electrical conductivity determination unit 51D captures the electrical conductivity from the voltage / current value during the production electrolysis, determines whether or not it is an appropriate value, and instructs the supply of raw water or the supply of electrolyte. In addition, the cleaning tank water level determination unit 51E determines the water level in the electrolytic cell 10 to detect the fullness, stops the generation of the electrolyzed water generating device XZ, and resumes the generation when the fullness is no longer detected. The water level is judged.

  Further, when the mixing tank water level determination unit 51F determines the upper limit of the water level in the electrolytic cell 10, the supply of the raw water is stopped by determining the lower limit of the water level by stopping the supply of the raw water by closing the water channel opening / closing valve V2. Is. The electrolyzed water generation command unit 51G generates and terminates the electrolyzed water generation device XZ based on the detection of the flow rate detection sensor S, and when the water level of the cleaning tank 20 reaches the upper limit by the cleaning tank water level determination unit 51E, issues an end command. It is something that is emitted.

DESCRIPTION OF SYMBOLS 1 Mixing tank XZ Electrolyzed water production | generation apparatus 10 Electrolytic tank 12 Electrolyte tank 20 Washing tank 30 Membrane processing apparatus 31 Filtration membrane 40 Drain waste water tank 50 Control unit

Claims (8)

  After removing the oil such as processing oil from the used alkaline electrolyzed water used for washing various articles and filtering, and then introducing this used alkaline electrolyzed water into the electrolytic cell and performing electrolysis again, A method for reusing alkaline electrolyzed water, characterized in that used alkaline electrolyzed water can be reused as washing water.   Used alkaline electrolyzed water filtered after removing oil such as processing oil and raw water are mixed in a mixing tank, and this mixed water is introduced into the above electrolytic tank and electrolyzed again, so that used alkaline electrolyzed water is obtained. The method of reusing alkaline electrolyzed water according to claim 1, wherein the water can be reused as washing water. A system for reusing alkaline electrolyzed water that makes used alkaline electrolyzed water used for cleaning various articles available for cleaning again,
Cleaning means for cleaning and removing soil substances containing oil such as processing oil adhering to various articles using alkaline electrolyzed water generated in an electrolytic cell;
A membrane treatment means for separating and removing the above-mentioned dirt substance from the used alkaline electrolyzed water containing the dirt substance removed by washing using a filtration membrane;
A recycling system for alkaline electrolyzed water, comprising: re-electrolytic treatment means for performing electrolytic treatment by sending the used alkaline electrolyzed water from which the contaminants are removed to the electrolytic cell again.   In the middle of the water supply path for introducing the raw water into the electrolytic cell, used alkaline electrolyzed water sent through the membrane treatment means and the raw water are mixed to form electrolyzed water, and this electrolyzed water The recycling system for alkaline electrolyzed water according to claim 3, wherein a mixing tank capable of repeating water electrolysis by feeding water into the electrolyzer is provided.   The pore size of the filtration membrane used in the membrane treatment means is configured to be 0.005 to 0.01 μm, which can collect and separate and remove oil such as processing oil, but can permeate the electrolyte. The reuse system of alkaline electrolyzed water according to claim 3.   The recycling system for alkaline electrolyzed water according to claim 3, wherein the membrane treatment means is configured to perform the cross-flow method using an ultrafiltration membrane.   Electrical conductivity measuring means for measuring the electrical conductivity of the electrolyzed water supplied to the electrolytic bath, and the supply amount of raw water to the mixing bath or the supply of electrolyte according to the measured electrical conductivity 5. The alkaline electrolyzed water reuse system according to claim 3 or 4, wherein a control means capable of controlling the amount is provided.   The alkalinity according to claim 7, wherein as the means for measuring the electrical conductivity, a means for measuring an electrolysis voltage and an electrolysis current and converting the electrical conductivity from these measured values is used. Electrolyzed water reuse system.

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