JP2017064662A - Electrolytic apparatus, electrolytic treatment system and waste liquid treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrolytic apparatus, an electrolytic treatment system and a waste liquid treatment system, in each of which generation of deposits at a cathode can be prevented and electrolysis can be efficiently performed.SOLUTION: The waste liquid treatment system is comprised of : an electrolytic apparatus 11 which comprises an anode 13, a cathode 14 and an ion exchange membrane that is monovalent cation-permeable and blocks cations having two or more valence, and in which the ion exchange membrane is disposed so that cations having two or more valence do not arrive at the cathode; an ammonia analyzing device 31 configured to sample gas, measure an ammonia concentration and discharge waste liquid containing a cyanogen compound; a waste liquid storage tank 41 configured to store the waste liquid discharged from the ammonia analyzing device 31; and a pump 51 configured to circulate the waste liquid between the waste liquid storage tank 41 and the electrolytic apparatus 11. The electrolytic apparatus 11 is configured to generate an oxidative substance by electrolytic treatment and oxidatively decompose a cyanogen compound in the waste liquid by the oxidative substance.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrolysis apparatus that performs electrolysis of a liquid to be treated, an electrolysis system, and a waste liquid treatment system.

  In a thermal power plant, a flue gas denitration device is installed in order to remove nitrogen oxides in exhaust gas (see, for example, Patent Document 1). The flue gas denitration apparatus decomposes nitrogen oxides in exhaust gas into nitrogen and water and detoxifies them by ammonia injected as a denitration catalyst and a reducing agent. Measurement of ammonia concentration is indispensable for performance management of flue gas denitration equipment, and ammonia concentration in exhaust gas is measured by an ammonia analyzer.

  In an ammonia analyzer, exhaust gas is absorbed in an absorbing solution, a reagent is added to measure the ammonia concentration, and the solution after the measurement is discharged as a waste solution. The waste liquid contains a cyanide compound derived from the exhaust gas and the reagent and needs to be decomposed.

  As one method for treating cyanide in waste liquid, there is a method in which an oxidizing substance is generated by electrolysis using an electrode, and the cyanide is oxidatively decomposed. In addition to cyanide compounds, waste liquid contains calcium ions, magnesium ions, etc. derived from coal ash and reagents in the exhaust gas. When the waste liquid containing these is electrolyzed, calcium or magnesium is added to the cathode. Therefore, it is necessary to perform maintenance work regularly and to remove the deposits on the cathode by acid cleaning or the like.

  In order to prevent precipitation of calcium, magnesium, etc. at the cathode, an anion exchange membrane that allows only anions to pass through is placed between the cathode and the anode to move metal ions (cations) from the anode side to the cathode side. A technique for performing an electrolysis process of an organic substance while preventing it has been proposed (see, for example, Patent Document 2).

JP 2007-260481 A JP 2004-33992 A

  According to the waste water treatment method and treatment apparatus described in Patent Document 2, precipitation of calcium, magnesium, and the like at the cathode can be prevented, but since all cations are blocked from moving to the cathode, the vicinity of the cathode In this case, the efficiency of the electrolysis treatment may be reduced due to a lack of cations and a decrease in electrical conductivity.

  An object of the present invention is to provide an electrolytic apparatus, an electrolytic treatment system, and a waste liquid treatment system that can prevent the formation of deposits at a cathode and perform an electrolysis process efficiently.

  The present invention is an electrolysis apparatus that includes an anode and a cathode, and performs electrolysis treatment of a liquid to be treated, and includes an ion selective permeation means that transmits monovalent cations and blocks divalent or higher cations, The ion selective permeation means is an electrolytic apparatus characterized in that a cation having a valence of 2 or more is arranged so as not to reach the cathode.

  According to the electrolysis apparatus of the present invention, a divalent or higher cation such as calcium ion or magnesium ion contained in the liquid to be treated does not reach the cathode by the ion selective permeation means such as an ion exchange membrane. The generation of precipitates such as metals such as calcium and magnesium, and other compounds derived from divalent or higher cation can be prevented, and the maintenance frequency can be reduced. Moreover, since ion selective permeation means that can transmit monovalent cations is used, a decrease in electrical conductivity in the vicinity of the cathode can be prevented, and electrolysis can be performed efficiently.

  In the electrolysis apparatus of the present invention, the anode is surrounded by the ion selective transmission means.

  In the electrolysis apparatus of the present invention, the cathode is surrounded by the ion selective transmission means.

  In the electrolysis apparatus of the present invention, the cathode has a structure that allows a liquid to be processed to pass therethrough.

  In the electrolytic apparatus of the present invention, the liquid to be treated contains a monovalent cation and a divalent cation.

  In the electrolytic apparatus of the present invention, the liquid to be treated includes a cyanide compound, an oxidizing substance is generated by an electrolysis process, and the cyanide compound is oxidatively decomposed by the oxidizing substance.

  In the electrolysis apparatus of the present invention, the liquid to be treated includes waste liquid discharged from an ammonia analyzer that samples a gas and measures an ammonia concentration.

  The present invention also provides an ion selective permeation having an anode and a cathode, and having an electrolysis apparatus for electrolyzing the liquid to be treated, and an ion selective permeation means for permeating monovalent cations and blocking divalent or higher cations. An electrolytic treatment system, wherein the ion selective transmission unit is installed upstream of the electrolysis device so that a cation having a valence of 2 or more does not reach the cathode of the electrolysis device.

  The present invention also provides the electrolytic device or the electrolytic treatment system, an ammonia analyzer that samples gas to measure ammonia concentration and discharges waste liquid containing cyanide, and stores the waste liquid discharged from the ammonia analyzer. A waste liquid storage tank, and a pump for circulating the waste liquid between the waste liquid storage tank and the electrolyzer, wherein the electrolyzer generates an oxidizing substance by an electrolysis process, and the oxidizing substance generates an oxidizing substance in the waste liquid. This is a waste liquid treatment system characterized by oxidizing and decomposing cyanide compounds.

  According to the waste liquid treatment system of the present invention, the maintenance frequency of the electrolyzer is reduced, continuous operation over a long period of time is possible, and the ammonia analyzer can be stably operated. Thereby, for example, it is possible to realize efficient and low cost management of the denitration catalyst of the flue gas denitration apparatus installed in the thermal power plant, and reduction of running cost by optimizing the ammonia injection amount.

  Also, if the ammonia concentration rises downstream of the flue gas denitration device, clogging of the air heater that preheats the air, etc. occurs, but by preventing the ammonia concentration from excessively rising by operating the ammonia analyzer stably, Problems such as clogging of the air heater can be prevented.

  According to the electrolysis apparatus and the electrolytic treatment system of the present invention, it is possible to prevent the formation of precipitates at the cathode and perform the electrolysis treatment efficiently. In addition, according to the waste liquid treatment system of the present invention, the maintenance frequency of the electrolysis apparatus is reduced, continuous operation over a long period of time is possible, and the ammonia analyzer can be stably operated.

It is a schematic block diagram of the waste liquid processing system 1 of 1st Embodiment of this invention. It is sectional drawing of the electrolysis apparatus 11 of the waste liquid processing system 1 of FIG. It is the elements on larger scale of the A section of FIG. It is a schematic block diagram of the thermal power plant 100 which is a use place of the waste liquid processing system 1 of FIG. It is sectional drawing of the electrolyzer 61 of 2nd Embodiment of this invention. It is sectional drawing of the electrolyzer 71 of 3rd Embodiment of this invention. It is sectional drawing of the electrolyzer 81 of 4th Embodiment of this invention. It is a schematic block diagram of the waste liquid processing system 2 of 5th Embodiment of this invention.

  FIG. 1 is a schematic configuration diagram of a waste liquid treatment system 1 according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the electrolyzer 11 of the waste liquid treatment system 1 of FIG. FIG. 3 is a partially enlarged view of part A in FIG. FIG. 4 is a schematic configuration diagram of a thermal power plant 100 which is a usage destination of the waste liquid treatment system 1 of FIG. In the figure, the ion exchange membrane 15 is marked with dots. In FIG. 2, the power source 16 is omitted, and in FIG. 3, only representative cations are shown.

  The waste liquid treatment system 1 according to the first embodiment of the present invention includes an ammonia analyzer 31 that measures ammonia concentration and discharges waste liquid, a waste liquid storage tank 41 that stores waste liquid discharged from the ammonia analyzer 31, and a waste liquid storage tank. The pump 51 circulates and circulates from the wastewater 41 and the electrolysis apparatus 11 that performs electrolysis of the waste liquid. The waste liquid discharged from the ammonia analyzer 31 is circulated between the electrolysis apparatus 11 and the waste liquid storage tank 41 by the pump 51. Then, oxidative decomposition of cyanide contained in the waste liquid is performed.

  Hereinafter, the configuration of the waste liquid treatment system 1 of the present embodiment will be described in detail by taking as an example the case where the ammonia analyzer 31 is used for measuring the ammonia concentration in the exhaust gas at the thermal power plant 100.

  In the thermal power plant 100, ammonia is supplied to the combustion gas (exhaust gas) discharged from the boiler 101 and is sent to the flue gas denitration device 102, and the ammonia and the denitration catalyst filled in the flue gas denitration device 102 emit exhaust gas. Nitrogen oxides contained therein are decomposed into nitrogen and water to make them harmless. At this time, surplus ammonia flows downstream of the flue gas denitration device 102, but when the ammonia concentration in the downstream of the flue gas denitration device 102 increases, sulfur oxide contained in the exhaust gas reacts with ammonia. The acidic ammonium sulfate increases, the adhesion of dust is promoted by the acidic ammonium sulfate, and problems such as clogging of the air heater 103 that preheats the air supplied to the boiler 101 occur.

  In order to optimize the supply amount of ammonia upstream of the flue gas denitration device 102, exhaust gas is collected from the gas sampling pipe 104 installed downstream of the flue gas denitration device 102, and the ammonia concentration in the exhaust gas is measured by the ammonia analyzer 31. In addition, the denitration catalyst filled in the flue gas denitration apparatus 102 is managed.

  The ammonia analyzer 31 is a known ammonia analyzer that measures the ammonia concentration by, for example, indophenol blue coloring CFA method using salicylic acid (see JIS K 0170-1: 2001). The waste liquid of the ammonia analyzer 31 contains a reagent and an absorbing liquid that has absorbed exhaust gas.

  Reagents include trisodium citrate dihydrate, sodium salicylate, sodium pentacyanonitrosyl iron (III) dihydrate, sodium dichloroisocyanurate dihydrate, sodium hydroxide, sulfuric acid, magnesium perchlorate, Ammonium chloride and polyoxyethylene dodecyl ether are included. The cyanide compound contained in the waste liquid of the ammonia analyzer 31 is mainly derived from cyanide ions generated by decomposition of sodium pentacyanonitrosyl iron (III) dihydrate.

  The exhaust gas collected from the gas sampling tube 104 contains coal ash, and the absorption liquid contains calcium, magnesium, and a small amount of cyan, which are components of the coal ash. As an example of the components contained in the coal ash, the main components of the coal ash certified reference materials (JSAC0521, JSAC0522) of the Japan Analytical Chemical Society are shown in Table 1.

  The electrolyzer 11 includes an electrolytic cell 12 that is a container through which waste liquid circulates, an anode 13 and a cathode 14 that are electrodes used for electrolysis, and ions that transmit monovalent cations and block divalent or higher cations. An ion exchange membrane 15 which is a selective permeation means, and a power source 16 for the anode 13 and the cathode 14, which performs an electrolysis treatment of the waste liquid and oxidatively decomposes cyanide compounds in the waste liquid, hydroxy radicals, active oxygen atoms, ozone, Produces highly oxidizable substances such as perchloric acid and hypochlorous acid.

  The electrolytic cell 12 is a container through which waste liquid circulates, and has an inlet 21 through which the waste liquid flows and two outlets 22 and 23.

  The inflow port 21 is formed in the vicinity of one end of the peripheral wall of the electrolytic cell 12. One outlet 22 is formed in the vicinity of the end of the peripheral wall of the electrolytic cell 12 opposite to the end where the inlet 21 is formed, and the other outlet 23 is the inlet of the electrolytic cell 12. It is formed in the center of the side wall opposite to the end portion on which 21 is formed. In addition, arrangement | positioning of the inflow port 21 and the discharge ports 22 and 23 is not limited to this, At least the inflow port 21 and one discharge port 22 are distribute | arranged to the outer side of the ion exchange membrane 15 mentioned later, and the other The discharge port 23 only needs to be arranged inside the ion exchange membrane 15.

  The anode 13 is a columnar electrode connected to the positive side of the power supply 16 and is installed in the center of the electrolytic cell 12. As the anode 13, for example, an iron oxide sintered electrode can be used.

  The cathode 14 is a cylindrical electrode connected to the negative side of the power supply 16 and is installed in the electrolytic cell 12 so as to surround the anode 13. As the cathode 14, for example, a titanium electrode can be used. Further, a plurality of through holes 25 are formed in the peripheral wall of the cathode 14 so that the flow of waste liquid into and out of the cathode 14 is not blocked. The cathode 14 is not limited to the one having the through-hole 25 formed, and for example, a cathode 14 having a structure that allows the waste liquid to pass therethrough such as a net-like one or a porous structure is used. it can.

  In this description, the electrolysis apparatus of the present invention is described by taking as an example the case where the cyanide compound contained in the waste liquid of the ammonia analyzer 31 is oxidatively decomposed. However, the use of the electrolysis apparatus of the present invention is limited to this. Is not to be done. For this reason, the shapes, materials, and the like of the electrolytic cell 12, the anode 13, and the cathode 14 can be appropriately determined according to the type of waste liquid, the configuration of the waste liquid treatment system, and the like.

  The ion exchange membrane 15 is a monovalent cation selective permeable ion exchange membrane that transmits monovalent cations and blocks divalent or higher cations. The ion exchange membrane 15 surrounds the cathode 14 and blocks the inlet 21 and the cathode 14 so as to block the movement of divalent or higher cation contained in the waste liquid flowing in from the inlet 21 to the vicinity of the cathode 14. It is installed in the electrolytic cell 12.

  A known power source 16 can be appropriately selected and used. As the waste liquid storage tank 41 and the pump 51, known ones can be appropriately selected and used.

  Next, the processing method of the cyanide compound in the waste liquid by the waste liquid processing system 1 of this embodiment is demonstrated. Waste liquid containing cyanide is discharged from the ammonia analyzer 31 and stored in the waste liquid storage tank 41. The waste liquid stored in the waste liquid storage tank 41 is pumped up by the pump 51 and circulates between the electrolysis apparatus 11 and the waste liquid storage tank 41 (see FIG. 1).

  The waste liquid contains sodium ions, calcium ions, magnesium ions and the like derived from coal ash (exhaust gas) and reagents in addition to cyanide compounds.

  In the electrolyzer 11, the waste liquid pressurized by the pump 51 flows from the inlet 21, and the waste liquid permeates the inside of the ion exchange membrane 15 and the cathode 14. Radicals, active oxygen atoms, ozone, perchloric acid, hypochlorous acid, etc. are generated. At this time, divalent or higher cation such as calcium ion and magnesium ion is blocked by the ion exchange membrane 15 and stays outside the ion exchange membrane 15, and monovalent cation such as sodium ion is ion exchange membrane. 15 passes through and stays in the vicinity of the cathode 14 (see FIG. 3).

  In the electrolysis apparatus 11, the cyanide ions in the waste liquid are oxidatively decomposed by the oxidizing substance generated in the vicinity of the anode 13, and the excess oxidizing substance is discharged from the discharge port 23 inside the ion exchange membrane 15 together with the treatment liquid. . The oxidizing substance discharged from the discharge port 23 is used for oxidative decomposition of cyanide compounds in the waste liquid in the waste liquid storage tank 41. In addition, divalent or higher cation such as calcium ion and magnesium ion remaining outside the ion exchange membrane 15 is discharged from the discharge port 22 outside the ion exchange membrane 15 (see FIG. 2).

  As described above, according to the waste liquid treatment system of the present embodiment, since a cation having a valence of 2 or more does not reach the vicinity of the cathode 14, a metal such as calcium or magnesium at the cathode 14, or other cation having a valence of 2 or more Generation | occurrence | production of deposits, such as a derived compound, is prevented, and the frequency which performs the maintenance of the cathode 14 can be reduced. In addition, since the monovalent cation permeates the ion exchange membrane 15 and stays in the vicinity of the cathode 14, the electric conductivity necessary for the electrolysis process is ensured, and the electrolysis process can be performed efficiently. As a result, the waste liquid treatment system 1 can be continuously operated over a long period of time.

  Since the waste liquid treatment system 1 can be operated continuously for a long period of time, the ammonia analyzer 31 can be stably operated, and the denitration catalyst management of the flue gas denitration device 102 of the thermal power plant 100 can be made more efficient and low. Running costs can be reduced by reducing the cost and optimizing the ammonia injection amount, and problems such as clogging of the air heater 103 can be prevented.

  FIG. 5 is a cross-sectional view of an electrolyzer 61 according to the second embodiment of the present invention. In FIG. 5, the power source 16 is omitted (the same applies to FIGS. 6 and 7). The same components as those of the electrolyzer 11 of the waste liquid treatment system 1 of the first embodiment shown in FIG. The basic configuration of the electrolyzer 61 of the present embodiment is the same as that of the electrolyzer 11 of the waste liquid treatment system 1 of the first embodiment, but the arrangement and shape of the cathode 62 are different.

  In the electrolysis apparatus 61 of this embodiment, the peripheral wall of the electrolytic cell 12 is a cathode 62, and the ion exchange membrane 15 is installed so as to block between the anode 13 and the cathode 62. The cathode 62 has no through hole 25 formed therein. The inflow port 21 is formed on the side wall on the opposite side of the discharge port 23 formed on the side wall inside the ion exchange membrane 15.

  In the electrolyzer 61 of this embodiment, the waste liquid flows in from the inlet 21, an oxidizing substance is generated in the vicinity of the anode 13 by electrolysis, and the cation is attracted to the cathode 62. Among the cations attracted to the cathode 62, monovalent cations permeate the ion exchange membrane 15 and stay in the vicinity of the cathode 62, and divalent or higher cations are blocked by the ion exchange membrane 15 and ionized. It remains inside the exchange membrane 15 and is discharged from the discharge port 23 inside the ion exchange membrane 15 together with the oxidizing substance generated in the vicinity of the anode 13.

  FIG. 6 is a cross-sectional view of an electrolyzer 71 according to a third embodiment of the present invention. The same components as those of the electrolyzer 61 of the second embodiment shown in FIG. Although the basic configuration of the electrolyzer 71 of the present embodiment is the same as that of the electrolyzer 61 of the second embodiment, the arrangement of the anode 72 and the cathode 73 is reversed.

  In the electrolysis apparatus 71 of the present embodiment, the peripheral wall of the electrolytic cell 12 is the anode 72, and the columnar cathode 73 is installed at the center of the electrolytic cell 12, thereby blocking between the anode 72 and the cathode 73. Thus, the ion exchange membrane 15 is installed. The inflow port 21 is formed on the side wall opposite to the discharge port 23 formed on the side wall outside the ion exchange membrane 15.

  In the electrolyzer 71 of the present embodiment, waste liquid flows from the inlet 21, an oxidizing substance is generated near the anode 72 by electrolysis, and cations are attracted to the cathode 73. Among the cations attracted to the cathode 73, monovalent cations permeate the ion exchange membrane 15 and stay in the vicinity of the cathode 73, and divalent or higher cations are blocked by the ion exchange membrane 15 and ionized. It remains outside the exchange membrane 15 and is discharged from the discharge port 23 outside the ion exchange membrane 15 together with the oxidizing substance generated in the vicinity of the anode 72.

  FIG. 7 is a cross-sectional view of an electrolyzer 81 according to a fourth embodiment of the present invention. The same components as those of the electrolyzer 11 of the waste liquid treatment system 1 of the first embodiment shown in FIG. The electrolysis apparatus 81 of this embodiment has the same basic configuration as the electrolysis apparatus 11 of the waste liquid treatment system 1 of the first embodiment, but the arrangement of the anode 13, the cathode 82, and the shape and arrangement of the ion exchange membrane 83 are different. .

  In the electrolysis apparatus 81 of this embodiment, the cylindrical anode 13 and the cylindrical cathode 82 are installed in parallel in the electrolytic cell 12, and are rectangular so as to block between the anode 13 and the cathode 82. The ion exchange membrane 83 is installed. The inlet 21 is formed in the peripheral wall near the end of the electrolytic cell 12 on the anode 13 side, and the two outlets 22 and 23 are respectively connected to the cathode 82 side and the anode 13 side with the ion exchange membrane 83 interposed therebetween. It is formed on the peripheral wall near the end opposite to the end where the inlet 21 is formed. The anode 13 and the cathode 82 are not limited to a cylindrical shape, and may be, for example, a prismatic shape or a plate shape.

  In the electrolysis apparatus 81 of the present embodiment, waste liquid flows from the inlet 21, an oxidizing substance is generated in the vicinity of the anode 13 by electrolysis, and cations are attracted to the cathode 82. Among the cations attracted to the cathode 82, monovalent cations permeate the ion exchange membrane 83 and stay in the vicinity of the cathode 82, and divalent or higher cations are blocked by the ion exchange membrane 83 and become the anode. It stays on the 13th side and is discharged from the discharge port 23 on the anode 13 side together with the oxidizing substance generated in the vicinity of the anode 13.

  As described above, according to the electrolyzers 61, 71, 81 of the second to fourth embodiments, as in the electrolyzer 11 of the waste liquid treatment system 1 of the first embodiment, a cation having a valence of 2 or more is an ion exchange membrane. 15 and 83, the cathode 62, 73, and 82 are not reached, and the formation of precipitates at the cathodes 62, 73, and 82 is prevented, and monovalent cations pass through the ion exchange membranes 15 and 83 and the cathode By staying in the vicinity of 62, 73, and 82, electrical conductivity is ensured and electrolysis can be performed efficiently.

  FIG. 8 is a schematic configuration diagram of the waste liquid treatment system 2 according to the fifth embodiment of the present invention. The same components as those in the waste liquid treatment system 1 according to the first embodiment shown in FIG. The waste liquid treatment system 2 of the present embodiment has the same basic configuration as the waste liquid treatment system 1 of the first embodiment, but the electrolyzer 91 does not have an ion exchange membrane, but has an ion exchange membrane 94. A selective transmission unit 93 is installed upstream of the electrolyzer 91.

  The waste liquid treatment system 2 of this embodiment includes an electrolytic treatment system 90 that includes an electrolysis apparatus 91 that does not have an ion exchange membrane and an ion selective permeation unit 93 that has an ion exchange membrane 94.

  The electrolytic cell 92 of the electrolysis apparatus 91 is not provided with an ion exchange membrane and a discharge port for discharging a waste liquid containing divalent or higher cation.

  The ion selective permeation unit 93 is a container having a monovalent cation selective permeation ion exchange membrane 94, and is installed upstream of the electrolyzer 91. The ion exchange membrane 94 is arranged in the ion selective permeation unit 93 so as to block the downstream movement of divalent or higher cations. The divalent or higher cation blocked by the ion exchange membrane 94 is discharged from the upstream side of the ion exchange membrane 94 and flows into the waste liquid storage tank 41.

  According to the waste liquid treatment system 2 of the present embodiment, the movement of divalent or higher cation to the cathode 14 is blocked by the ion exchange membrane 94 installed in the ion selective permeation unit 93. Thereby, there exists an effect similar to the waste liquid processing system 1 of 1st Embodiment. In the waste liquid treatment system 2 of the present embodiment, the composition constituted by the electrolyzer 91 and the ion selective permeation unit 93 is referred to as the electrolysis treatment system 90. However, the composition is also an electrolyzer equipped with the ion selective permeation unit 93. I can say that.

  As described above, using the waste liquid treatment systems 1 and 2, the electrolysis apparatuses 11, 61, 71, 81, 91, and the electrolysis treatment system 90 according to the first to fifth embodiments, the electrolysis apparatus, the electrolysis treatment system, and the waste liquid treatment system of the present invention. However, the electrolysis apparatus, the electrolytic treatment system, and the waste liquid treatment system of the present invention are not limited to the above-described embodiment, and can be modified without changing the gist.

  In the electrolytic apparatus, electrolytic treatment system, and waste liquid treatment system of the present invention, the arrangement and shape of the electrolytic cell, anode, cathode, ion exchange membrane, inlet, outlet, and ion selective permeation unit are limited to specific shapes. Instead, at least an ion-exchange membrane may be arranged so that divalent or higher cation does not reach the cathode.

  In the electrolysis apparatus, electrolytic treatment system, and waste liquid treatment system of the present invention, ion selective permeation means such as ion exchange cloth or ion exchange resin can be used in place of the ion exchange membranes 15, 83, 94.

  The electrolysis apparatus, electrolytic treatment system and waste liquid treatment system of the present invention can be used for oxidative decomposition treatment of various organic compounds and inorganic compounds and electrolysis treatment of various solutions in addition to the oxidative decomposition treatment of cyanide compounds. .

  As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification. Therefore, such changes and modifications are interpreted as being within the scope of the invention defined by the claims.

DESCRIPTION OF SYMBOLS 1, 2, Waste liquid processing system 11, 61, 71, 81, 91 Electrolyzer 13, 72 Anode 14, 62, 73, 82 Cathode 15, 83, 94 Ion exchange membrane 21 Inlet 25 Through-hole 31 Ammonia analyzer 41 Waste liquid storage tank 51 Pump 90 Electrolytic treatment system 93 Ion selective permeation unit

Claims (9)

An electrolysis apparatus that includes an anode and a cathode and performs electrolysis treatment of a liquid to be treated,
An ion selective permeation means that transmits monovalent cations and blocks divalent or higher cations;
The electrolysis apparatus according to claim 1, wherein the ion selective permeation means is arranged so that cations having a valence of 2 or more do not reach the cathode.   The electrolysis apparatus according to claim 1, wherein the anode is surrounded by the ion selective transmission means.   The electrolysis apparatus according to claim 1 or 2, wherein the cathode is surrounded by the ion selective transmission means.   The electrolysis apparatus according to any one of claims 1 to 3, wherein the cathode has a structure that allows a liquid to be processed to pass therethrough.   The electrolyzer according to any one of claims 1 to 4, wherein the liquid to be treated contains a monovalent cation and a divalent cation. The liquid to be treated contains a cyanide compound,
6. The electrolysis apparatus according to claim 1, wherein an oxidizing substance is generated by electrolysis, and the cyanide compound is oxidatively decomposed by the oxidizing substance.   The electrolyzer according to any one of claims 1 to 6, wherein the liquid to be treated includes a waste liquid discharged from an ammonia analyzer that samples a gas and measures an ammonia concentration. An electrolysis apparatus comprising an anode and a cathode, and performing an electrolysis treatment of a liquid to be treated;
An ion selective permeation unit having ion selective permeation means that transmits monovalent cations and blocks divalent or higher cations;
The electrolytic treatment system, wherein the ion selective transmission unit is installed upstream of the electrolysis device so that cations having a valence of 2 or more do not reach the cathode of the electrolysis device. The electrolysis apparatus according to any one of claims 1 to 7 or the electrolytic treatment system according to claim 8,
An ammonia analyzer that samples the gas, measures the ammonia concentration, and discharges the waste liquid containing cyanide,
A waste liquid storage tank for storing the waste liquid discharged from the ammonia analyzer;
A pump for circulating the waste liquid between the waste liquid storage tank and the electrolyzer,
The electrolyzer generates an oxidizing substance by electrolysis, and oxidatively decomposes a cyanide compound in the waste liquid with the oxidizing substance.

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