JP2013223860A - Apparatus and method for removing dissolved sulfide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and method for removing dissolved sulfide, capable of removing the dissolved sulfide from raw water, such as wastewater, directly and efficiently.SOLUTION: An apparatus A for removing dissolved sulfide from raw water W1 in which sulfide is dissolved is composed of a reaction tank 1 that temporarily stores the raw water W1, activated carbon 2, and an activated carbon movement mechanism 3 that repeatedly reciprocally circulates the activated carbon 2 between the raw water W1 stored in the reaction tank 1 and gas R containing oxygen.

Description

  The present invention relates to a dissolved sulfide removal apparatus and a method for removing dissolved sulfide for removing sulfides dissolved in water.

When molecular sulfides such as hydrogen sulfide (H ₂ S) and ion sulfides such as hydrogen sulfide ions (HS ⁻ ) and sulfide ions (S ²⁻ ) are dissolved in water, they are volatilized as hydrogen sulfide. In addition, there is a risk of causing bad odor, concrete corrosion, metal corrosion and the like. For this reason, food processing factories, sewage treatment plants, human waste treatment plants, and the like take measures to remove this kind of dissolved sulfide from wastewater and the like and to remove volatilized hydrogen sulfide from the gas phase.

  Here, the ratio of the sulfide dissolved in water is high as a molecular sulfide in the acidic region and as an ionic sulfide in the alkaline region. For this reason, conventionally, when removing dissolved sulfide from treated raw water such as wastewater (raw water to be treated), acid such as hydrochloric acid is used to acidify the raw water and convert sulfide to molecular sulfide such as hydrogen sulfide. And aerated raw water adjusted to pH in this acidic region to forcibly volatilize dissolved sulfides, and vaporized sulfides, that is, hydrogen sulfide is adsorbed and removed with special activated carbon, or captured and removed with a desulfurizing agent, A method of removing dissolved sulfide from the raw water for treatment is frequently used.

  On the other hand, as a method of removing volatilized hydrogen sulfide from the gas phase, Patent Document 1 discloses a method of using activated carbon as a catalyst in addition to a method of adsorbing and removing with activated carbon and a method of capturing and removing with a desulfurizing agent. In the method of Patent Document 1, malodorous gas containing hydrogen sulfide is circulated in the washing tower while jetting the alkaline aqueous solution from the spray provided in the upper part of the washing tower, and the aqueous hydrogen solution absorbs hydrogen sulfide. Then, activated carbon is added to an aqueous alkaline solution containing hydrogen sulfide and aerated, and aerated, and aerated, and the oxidized sulfide is oxidized by air using the catalytic action of activated carbon to convert dissolved sulfide to sulfur (single sulfur, colloidal sulfur). ). Thus, since the dissolved sulfide can be oxidized to chemically stable sulfur without being converted again to hydrogen sulfide by the catalytic action of activated carbon, the treated water can be discharged as it is.

Japanese Examined Patent Publication No. 62-4167

  However, in the above method for removing dissolved sulfide from the treated raw water, since aeration is performed to volatilize hydrogen sulfide in the gas phase, the amount of air is much larger than the amount of the treated raw water. Thereby, there existed a problem that the scale of the whole apparatus (dissolved sulfide removal apparatus) which combined the aeration tank and the desulfurization apparatus with respect to the processing amount became large.

  In addition, it requires two steps: volatilization of dissolved sulfide from the raw water treated by aeration (volatilization process) and removal of hydrogen sulfide (vaporized sulfide) from the gas phase (removal process). There is a strong demand for a technique that is inefficient and directly removes the dissolved sulfide from the treated raw water. It is also possible to add activated carbon to the treated raw water to directly adsorb and remove dissolved sulfides, but there is a limit to the amount of activated carbon adsorbed, and the higher the dissolved sulfide concentration, the greater the treatment efficiency and the economics. This method is not practical because it causes problems.

  On the other hand, using the method disclosed in Patent Document 1, it is also conceivable that the dissolved sulfide is directly removed from the treated raw water by oxidizing the dissolved sulfide to sulfur by the catalytic action of activated carbon. However, even in this method, the activated carbon added to the treated raw water is accelerated by aeration to promote the oxidation reaction of the dissolved sulfide, so that the amount of air is still much larger than the treated raw water. As a result, the scale of the entire apparatus becomes large.

  In view of the above circumstances, the present invention has an object to provide a dissolved sulfide removal apparatus and a dissolved sulfide removal method capable of directly and efficiently removing dissolved sulfide from raw water such as waste water. To do.

  In order to achieve the above object, the present invention provides the following means.

  The apparatus for removing dissolved sulfide according to the present invention is an apparatus for removing dissolved sulfide from raw water in which sulfide is dissolved, and a reaction tank for temporarily storing the raw water, activated carbon, and the reaction tank. And an activated carbon advance / retreat mechanism for repeatedly circulating the activated carbon back and forth between the stored raw water and a gas containing oxygen.

  Further, the method for removing dissolved sulfide of the present invention is a method for removing dissolved sulfide from raw water in which sulfide is dissolved, and activated carbon is repeatedly reciprocated between the raw water and a gas containing oxygen. It is characterized by that.

  Further, in the dissolved sulfide removing apparatus of the present invention, the activated carbon advance / retreat mechanism includes a rotating shaft portion rotatably supported around an axis, and holds the activated carbon and is detachably supported on the rotating shaft portion. Activated carbon holding means, and rotation driving means for rotating the rotating shaft around the axis and reciprocatingly circulating the activated carbon holding means and the activated carbon between the raw water and the gas. desirable.

  Moreover, in the dissolved sulfide removing apparatus of the present invention, the activated carbon holding means may be configured to be rotatable in a direction orthogonal to the direction of water flow of the raw water.

  Further, in the dissolved sulfide removing apparatus of the present invention, the activated carbon advance / retreat mechanism includes a rotating shaft portion rotatably supported around an axis, and holds the activated carbon and is detachably supported on the rotating shaft portion. Activated carbon holding means, and the activated carbon holding means may be configured to be rotatable in a direction parallel to the water flow direction of the raw water.

  According to the dissolved sulfide removing apparatus and the dissolved sulfide removing method of the present invention, the activated carbon is repeatedly moved back and forth between raw water (liquid phase) and a gas containing oxygen such as air (gas phase) by the activated carbon advance / retreat mechanism. By circulating, activated carbon, dissolved sulfide in raw water, and oxygen in gas can be continuously contacted, activated carbon acts as a catalyst, oxidized dissolved oxygen in raw water by oxygen, and converted to sulfur. It becomes possible to convert.

  As a result, treated water having a reduced concentration of dissolved sulfide can be obtained simply by repeatedly reciprocating the activated carbon between the raw water and the gas containing oxygen.

  In addition, the activated carbon is repeatedly reciprocated between the raw water and the gas containing oxygen, and the activated carbon is intermittently disposed in the gas phase, so that the raw water is discharged from between the activated carbons (gap between the granular activated carbons), At the same time, sulfur generated between the activated carbons can be eliminated. As a result, the contact area of the activated carbon that comes into contact with oxygen or dissolved sulfide can be automatically recovered, and the activated carbon can be automatically immersed in the raw water in a state of containing a gas containing new oxygen. it can. That is, it is possible to continuously perform the removal process of the dissolved sulfide while automatically recovering the removal performance of the dissolved sulfide.

  And since activated sulfide can be repeatedly reciprocated between the raw water and the gas containing oxygen and the dissolved sulfide can be removed without performing aeration, the overall configuration of the apparatus (processing equipment) becomes very compact. be able to. Further, since the apparatus can be made compact, the apparatus can be made portable. In this case, the treatment can be performed on-site where sulfide-containing water (raw water) is generated.

  Furthermore, the activated carbon is repeatedly reciprocated between the raw water and the gas containing oxygen, and the activated sulfide is converted to sulfur by the catalytic action of the activated water to remove it, so that hydrogen sulfide is not vaporized and sulfided. It is possible to remove dissolved sulfides while reliably preventing hydrogen from being diffused. In addition, since the dissolved sulfide in the raw water can be recovered and removed as sulfur, the waste cost associated with the treatment can be greatly reduced.

  Furthermore, when the removal treatment is continuously performed, the performance of the activated carbon as a catalyst gradually decreases due to the generated sulfur, but compared with the case of removing the dissolved sulfide by the adsorption performance of the activated carbon, the sulfur is reduced. The performance of activated carbon can be easily recovered and regenerated by simply removing it.

  Therefore, according to the device for removing dissolved sulfide and the method for removing dissolved sulfide of the present invention, it is possible to remove dissolved sulfide from raw water such as waste water more directly and efficiently than conventional methods. .

  In the dissolved sulfide removal apparatus of the present invention, the activated carbon advance / retreat mechanism includes a rotating shaft portion that rotates about the axis, and activated carbon holding means that is detachably attached to and supported by the rotating shaft portion. Therefore, the activated carbon held in the activated carbon holding means can be repeatedly reciprocated between the raw water and the gas containing oxygen simply by rotating the rotating shaft portion. Thereby, it becomes possible to perform the removal process of dissolved sulfide more efficiently. In addition, since the activated carbon holding means is detachably attached, if the performance of the activated carbon deteriorates, the processing performance can be easily recovered simply by removing and replacing the activated carbon holding means. In addition, it is possible to efficiently remove dissolved sulfides.

It is a figure which shows the removal apparatus (and removal method of dissolved sulfide) of the dissolved sulfide which concerns on 1st embodiment of this invention. It is a figure which shows the example of a change of the removal apparatus of the dissolved sulfide which concerns on 1st embodiment of this invention. It is a figure which shows the removal apparatus (and removal method of dissolved sulfide) of the dissolved sulfide which concerns on 2nd embodiment of this invention.

(First embodiment)
Hereinafter, the dissolved sulfide removing apparatus and the dissolved sulfide removing method according to the first embodiment of the present invention will be described with reference to FIG. The present embodiment relates to an apparatus for removing dissolved sulfide and a method for removing dissolved sulfide for removing dissolved sulfide from raw water such as waste water in which sulfide is dissolved by the catalytic action of activated carbon.

  As shown in FIG. 1, the dissolved sulfide removal apparatus A of the present embodiment comprises a reaction tank 1 that temporarily stores treated raw water (raw raw water to be treated) W1 such as waste water, activated carbon 2, and activated carbon 2. An activated carbon advance / retreat mechanism 3 that repeatedly circulates between the treated raw water W1 stored in the reaction tank 1 and air (a gas containing oxygen) R is configured.

  The reaction tank 1 of the present embodiment is a container having an open top, and at the side, a raw water supply port 1a for introducing the treated raw water W1 into the inside and a treated raw water W1 to be discharged to the outside as treated water W2. The treated water discharge port 1b is formed. The raw water supply port 1a is provided on one side and connected to the water supply pipe 4. The treated water discharge port 1b is provided on the other side opposite to the raw water supply port 1a. In this embodiment, the raw water W1 is supplied from the water supply pipe 4 to the inside of the reaction tank 1 through the raw water supply port 1a by the drive of the water pump 5, and the raw water W1 is supplied and processed sequentially from the treated water discharge port 1b. Water (raw raw water after treatment) W2 is overflowed and discharged.

  The activated carbon advancing / retreating mechanism 3 of the present embodiment extends in a horizontal direction along the axis O1 along the liquid surface of the treated raw water W1 in the reaction tank 1, and is rotatably supported around the axis O1. Shaft portion 6, activated carbon holding means 7 that holds activated carbon 2 and is detachably supported on rotating shaft portion 6, and rotates rotating shaft portion 6 about axis O 1 and also holds activated carbon holding means 7 and activated carbon 2 (activated carbon cartridge) 8) is provided with a rotation drive means 9 such as a conductive motor for repeatedly reciprocatingly circulating 8) between the treated raw water W1 and the air R. Moreover, the activated carbon holding means 7 of this embodiment is comprised so that rotation in the direction orthogonal to the water flow direction of the process raw water W1 is possible.

  The activated carbon holding means 7 is configured such that the activated carbon 2 can be brought into contact with the treated raw water W1 while being immersed in the treated raw water W1. In the dissolved sulfide removal apparatus A of the present embodiment, for example, the activated carbon holding means 7 is a cylindrical column, the inside of this column is filled with granular activated carbon 2, and the openings at both ends of the column are mesh-like. It is configured by attaching a cover material, or the activated carbon holding means 7 is formed into a cylindrical column having a plurality of through holes penetrating from the outer surface to the inner surface, and the activated carbon 2 is filled inside the column, or the activated carbon holding means 7 is a mesh-like member, and the activated carbon 2 is included in the mesh-like member.

  And this activated carbon holding means 7 uses the attachment member 10, and in the state which made the rotating shaft part 6 arrange | positioned near the liquid level of the process raw | natural water W1 and mutual axis lines O1, O2 in parallel, this rotating shaft part 6 Removably attached and supported. In the present embodiment, the attachment members 10 are respectively attached to the one end side and the other end side of the activated carbon holding means 7 in the axis O2 direction, and the activated carbon cartridge 8 including the activated carbon 2 and the activated carbon holding means 7 is rotated by the two attachment members 10. It is attached to and supported by the shaft portion 6. Further, in the present embodiment, two activated carbon cartridges 8 are provided, and these two activated carbon cartridges 8 are attached by mounting members 10 at symmetrical positions with the rotation shaft portion 6 therebetween. Needless to say, the activated carbon 2 and the activated carbon holding means 7 that holds the activated carbon 2 and one activated carbon cartridge 8 may be provided to constitute the dissolved sulfide removing apparatus A, or two or more activated sulfide cartridges 8 may be provided.

  Next, when the dissolved sulfide is removed from the treated raw water W1 containing the dissolved sulfide using the dissolved sulfide removing apparatus A of the present embodiment configured as described above (the dissolved sulfide of the present embodiment). First, the water feed pump 5 is driven to supply the treated raw water W1 to the reaction tank 1. At the same time, the rotation driving means 9 is driven to rotate the rotating shaft portion 6 in one direction around the axis O1.

  When the rotating shaft 6 is rotated, one activated carbon cartridge 8 (activated carbon 2 and activated carbon holding means 7) is immersed in the raw water W1 of the reaction tank 1, and the activated carbon cartridge 8 and the rotating shaft 6 are connected to each other. The other activated carbon cartridge 8 (the activated carbon 2 and the activated carbon holding means 7) in a symmetrical position is arranged in the air R, and the rotation of the rotating shaft 6 causes the one activated carbon cartridge 8 and the other activated carbon cartridge 8 to alternate. And continuously reciprocatingly circulate between the treated raw water W1 and the air R.

  At this time, when the activated carbon cartridge 8 is immersed in the treated raw water W1, the treated raw water W1 enters through the holes of the columns and the like and comes into contact with the activated carbon 2. When the activated carbon cartridge 8 is discharged from the treated raw water W1 into the air R, the entered treated raw water W1 is discharged, and the activated carbon 2 comes into contact with the air R. Furthermore, when the activated carbon cartridge 8 enters the treated raw water W1 from the air R, the activated carbon cartridge 8 is immersed between the activated carbons 2 (intervals between the granular activated carbons 2) with the air R entrained, and the treated raw water W1 is gradually added. The air R enters the activated carbon 2 and is discharged.

  When the activated carbon 2 is repeatedly reciprocated between the treated raw water W1 and the air R together with the activated carbon cartridge 8 in this way, the dissolved sulfide in the treated raw water W1 is not adsorbed on the activated carbon 2, but the activated carbon 2 acts as a catalyst. The dissolved sulfide is oxidized by oxygen in the air R.

As a result, the rotating shaft 6 is rotated around the axis O1, and the activated carbon 2 is simply reciprocated between the treated raw water W1 and the air R, and the molecular sulfide (H ₂ S) is, hydrogen sulfide ion in the oxidation reaction (HS ^-), is converted into sulfide ions status sulfide ions ^{(S 2-),} further ionic state sulfide ^{(HS -, S 2-)} is, oxidation reaction Is converted into chemically stable simple substance and / or colloidal sulfur, sulfate ion, and thiosulfate ion.

  Therefore, the treated water W2 from which the dissolved sulfide is removed and the dissolved sulfide concentration is extremely low is discharged from the treated water discharge port 1b of the reaction tank 1. In addition, the purified treated water W2 from which the dissolved sulfide has been removed can be obtained by appropriately filtering the treated water W2. Further, the sulfur that has settled and accumulated at the bottom of the reaction tank 1 may be recovered as appropriate.

  Here, when the removal treatment of the dissolved sulfide is performed while the activated carbon 2 is immersed in the treated raw water W1, the contact area of the activated carbon 2 with the dissolved sulfide and the air R gradually decreases with the generation of sulfur. As a result, there is a possibility that the performance of removing dissolved sulfides may gradually deteriorate.

  On the other hand, in the dissolved sulfide removal apparatus A and the dissolved sulfide removal method of this embodiment, when the activated carbon 2 is intermittently disposed in the air R, the treated raw water W1 is discharged from between the activated carbon 2. At the same time, sulfur accumulated between the activated carbons 2 is discharged. As a result, the contact area of the activated carbon 2 is automatically recovered, and the activated carbon 2 is automatically immersed in the treated raw water W1 in a state in which the fresh air R is included, and the dissolved sulfide is automatically removed. Recovery will be achieved.

  Moreover, in this embodiment, since the activated carbon 2 is detachably attached to the activated carbon advance / retreat mechanism 3, when the removal performance by the activated carbon 2 is deteriorated, the activated carbon cartridge 8 can be easily replaced and dissolved efficiently. Sulfide can be removed.

  Therefore, in the dissolved sulfide removing apparatus A and the dissolved sulfide removing method of the present embodiment, the activated carbon advance / retreat mechanism 3 converts the activated carbon 2 into the raw water W1 (liquid phase) and a gas R (gas phase) containing oxygen such as air. ), The activated sulfide 2 and the dissolved sulfide in the raw water W1 can be continuously brought into contact with the oxygen in the gas R, and the activated carbon 2 acts as a catalyst in the raw water W1. The dissolved sulfide can be oxidized with oxygen and converted to sulfur.

  Thereby, the treated water W2 in which the dissolved sulfide concentration is reduced can be obtained only by reciprocally circulating the activated carbon 2 between the raw water W1 and the gas R containing oxygen.

  Further, the activated carbon 2 is repeatedly reciprocated between the raw water W1 and the gas R containing oxygen, and the activated carbon 2 is intermittently disposed in the gas phase, so that the raw water W1 is discharged from between the activated carbons 2 and this. It becomes possible to exclude sulfur generated between the activated carbons 2. As a result, the contact area of the activated carbon 2 that is in contact with oxygen or dissolved sulfide can be automatically recovered, and the activated carbon 2 is automatically contained in the raw water W1 while containing the gas R containing new oxygen. Can be immersed. That is, it is possible to continuously perform the removal process of the dissolved sulfide while automatically recovering the removal performance of the dissolved sulfide.

  Since the activated carbon 2 is repeatedly circulated between the raw water W1 and the oxygen-containing gas R in this way, and dissolved sulfides can be removed without aeration, the configuration of the entire apparatus (processing equipment) A is very Can be made compact. In addition, since the apparatus A can be made compact, the apparatus A can be made portable. In this case, the treatment can be performed on-site where sulfide-containing water (raw water W1) is generated. .

  Further, the activated carbon 2 is repeatedly reciprocated between the raw water W1 and the gas R containing oxygen, and the dissolved sulfide in the raw water W1 is converted to sulfur by the catalytic action of the activated carbon 2 so that hydrogen sulfide is vaporized. Therefore, it is possible to remove the dissolved sulfide while reliably preventing hydrogen sulfide from being diffused. Moreover, since the dissolved sulfide in raw | natural water W1 can be collect | recovered and removed as sulfur, it also becomes possible to reduce the waste cost accompanying a process significantly.

  Furthermore, when the removal treatment is continuously performed, the performance of the activated carbon 2 as a catalyst gradually decreases due to the generated sulfur, but compared with the case where the dissolved sulfide is removed by the adsorption performance of the activated carbon 2, The performance of the activated carbon 2 can be easily recovered and regenerated simply by removing sulfur.

  Therefore, according to the dissolved sulfide removal apparatus A and the dissolved sulfide removal method of the present embodiment, it is possible to remove the dissolved sulfide from the raw water W1 such as waste water more directly and efficiently than in the past. It becomes possible.

  Further, in the dissolved sulfide removing apparatus A of the present embodiment, the activated carbon advance / retreat mechanism 3 has a rotating shaft portion 6 that rotates around the axis O1 and an activated carbon holding member that is detachably attached to and supported by the rotating shaft portion 6. Therefore, the activated carbon 2 held by the activated carbon holding means 7 is repeatedly reciprocated between the raw water W1 and the oxygen-containing gas R only by rotating the rotating shaft portion 6. Can do. Thereby, it becomes possible to perform the removal process of dissolved sulfide more efficiently. Moreover, since the activated carbon holding means 7 is detachably attached, when the performance of the activated carbon 2 is reduced, the treatment performance can be easily recovered by simply removing and replacing the activated carbon holding means 7, Also from this point, the dissolved sulfide can be efficiently removed.

(Second embodiment)
Hereinafter, the dissolved sulfide removing apparatus and the dissolved sulfide removing method according to the second embodiment of the present invention will be described with reference to FIG. 3. Note that this embodiment is different from the first embodiment only in the configuration of the activated carbon advance / retreat mechanism and the reaction tank, and the other portions are substantially the same as those in the first embodiment. Detailed description will be omitted.

  As shown in FIG. 3, the dissolved sulfide removal apparatus B of the present embodiment includes a reaction tank 11 that temporarily stores treated raw water (raw raw water to be treated) W1 such as waste water, activated carbon 2, and activated carbon 2. An activated carbon advance / retreat mechanism 13 that repeatedly circulates between the treated raw water W1 stored in the reaction tank 11 and air (a gas containing oxygen) R is configured. In the present embodiment, four activated carbon advance / retreat mechanisms 13 are arranged inside the reaction tank 11.

  The reaction tank 11 of the present embodiment is a container having an open top, and in order to discharge the raw water supply port 11a for introducing the treated raw water W1 into the inside and the treated raw water W1 to the outside as treated water W2. The treated water discharge port 11b is formed. The raw water supply port 11a is provided on one side and connected to the water supply pipe 4. The treated water discharge port 11b is provided on the other side opposite to the raw water supply port 11a. And in this embodiment, it forms so that the bottom face of the reaction tank 11 may become a downward slope toward the other side part from one side part. That is, in the reaction tank 11, the treated raw water W1 is supplied into the reaction tank 11 from the feed water pipe 4 through the raw water supply port 11a, and the treated raw water W1 naturally flows from one side to the other side using gravity. Then, the treated water (raw water after treatment) W2 is sequentially discharged from the treated water discharge port 11b.

  The activated carbon advance / retreat mechanism 13 of the present embodiment is provided with the axis O3 in the horizontal direction along the surface of the treated raw water W1 in the reaction tank 11, and is a rotary shaft that is rotatably supported around the axis O3. Part 16 and activated carbon holding means 17 that holds activated carbon 2 and is detachably attached to rotating shaft part 16. Moreover, in this embodiment, the activated carbon holding means 17 is comprised so that it can rotate in the direction (arrow direction of FIG. 3) parallel to the water flow direction of the process raw water W1.

  The activated carbon holding means 17 is configured so that the activated carbon 2 can be brought into contact with the treated raw water W1 while being immersed in the treated raw water W1. Further, the activated carbon holding means 17 of the present embodiment is configured to be rotatable around the axis O3 using the water flow of the treated raw water W1 that has been distributed from one side, in other words, to be rotatable like a water wheel. .

  The activated carbon cartridge 18 including the activated carbon holding means 17 and the activated carbon 2 is attached to and detached from the distal ends of a plurality of (eight in the present embodiment) mounting members 20 radially extending from the rotating shaft 16 at substantially equal intervals. It is attached as possible. In this embodiment, eight activated carbon cartridges 18 are provided in one activated carbon advance / retreat mechanism 13, but of course, the number of activated carbon cartridges 18 constituting the activated carbon advance / retreat mechanism 13 is not limited thereto.

  And in this embodiment, the activated carbon advance / retreat mechanism 13 comprised as mentioned above is arrange | positioned at substantially equal intervals along the water flow direction of the process raw water W1. In the present embodiment, four activated carbon advance / retreat mechanisms 13 are provided in one removing device B. Of course, the number of activated carbon advance / retreat mechanisms 13 is not limited thereto.

  Next, when the dissolved sulfide is removed from the treated raw water W1 containing the dissolved sulfide using the dissolved sulfide removing apparatus B of the present embodiment configured as described above (the dissolved sulfide of the present embodiment). In the method for removing substances), first, the treated raw water W1 is supplied to the reaction tank 11 through the water supply pipe 4. Then, since the bottom surface of the reaction tank 11 has a downward slope, the treated raw water W1 naturally flows down from one side to the other side. Then, the treated raw water W1 comes into contact with the activated carbon holding means 17 located near the lower end of the activated carbon advance / retreat mechanism 13, and the activated carbon holding means 17 is centered on the rotating shaft portion 16 (axis O3) using the momentum of the water flow of the treated raw water W1. Rotate like a water wheel.

  When the rotating shaft portion 16 is rotated, a part of the activated carbon cartridge 18 (activated carbon 2 and activated carbon holding means 17) located near the lower end is immersed in the raw water W1 of the reaction tank 11, and the other activated carbon cartridges 18 are used. Are disposed in the air R, and the plurality of activated carbon cartridges 18 are reciprocally circulated between the processing raw water W1 and the air R in order and continuously like a water wheel by the rotation of the rotating shaft portion 16. Further, when the treated raw water W1 naturally flows down in the reaction tank 1, the treated raw water W1 flows while contacting the activated carbon holding means 17 (activated carbon 2) of the plurality of activated carbon advancing / retreating mechanisms 13, and is treated as treated water W2 from the treated water discharge port 11b. Will be discharged.

As a result, similar to the first embodiment, when the activated carbon 2 is repeatedly reciprocated between the treated raw water W1 and the air R together with the activated carbon cartridge 18, the dissolved sulfide in the treated raw water W1 is not adsorbed on the activated carbon 2, Activated carbon 2 acts as a catalyst, and dissolved sulfide is oxidized by oxygen in air R. That is, molecular sulfide (H ₂ S) is converted into hydrogen sulfide ion (HS ⁻ ) and sulfide ion (S ²⁻ ) ion sulfide by an oxidation reaction, and further ion sulfide (HS ⁻ , S ²⁻ ) is converted into chemically stable simple substance and / or colloidal sulfur, sulfate ion, thiosulfate ion by oxidation reaction.

  Therefore, the treated raw water W1 sequentially passes through the four activated carbon advancing / retreating mechanisms 13, whereby the dissolved sulfide is removed. As a result, the treated water W2 having a very low dissolved sulfide concentration is discharged from the treated water discharge port 11b of the reaction tank 11. In addition, the purified treated water W2 from which the dissolved sulfide has been removed can be obtained by appropriately filtering the treated water W2. Moreover, what is necessary is just to collect | recover suitably the sulfur which settled on the bottom part of the reaction tank 11, and was collected.

  In the dissolved sulfide removing apparatus B and the dissolved sulfide removing method of the present embodiment, the same effects as those of the first embodiment can be obtained. That is, according to the dissolved sulfide removing apparatus B and the dissolved sulfide removing method of the present embodiment, it is possible to remove the dissolved sulfide from the raw water W1 such as drainage more directly and efficiently than in the past. It becomes possible.

  Further, in the dissolved sulfide removing apparatus B of the present embodiment, the activated carbon advance / retreat mechanism 13 has a rotating shaft portion 16 that rotates around the axis O3, and an activated carbon holding member that is detachably attached to and supported by the rotating shaft portion 16. Therefore, the activated carbon 2 held by the activated carbon holding means 17 is repeatedly reciprocated between the raw water W1 and the oxygen-containing gas R simply by rotating the rotary shaft portion 16. Can do. Thereby, it becomes possible to perform the removal process of dissolved sulfide more efficiently. In addition, since the activated carbon holding means 17 is detachably attached, when the performance of the activated carbon 2 is reduced, the treatment performance can be easily recovered simply by removing and replacing the activated carbon holding means 17, Also from this point, the dissolved sulfide can be efficiently removed.

  Further, in the present embodiment, the activated carbon holding means 17 is configured to be able to rotate in a direction parallel to the water flow direction of the treated raw water W1, and the bottom surface of the reaction tank 11 descends from one side toward the other side. A gradient was formed. Therefore, the raw raw water W1 naturally flows down in the reaction tank 11, and the activated carbon holding means 17 can be rotated using the water flow. That is, since the rotating shaft portion 16 is configured to rotate like a water wheel without using electricity or the like, the removing device B can be realized with a simpler configuration.

  As mentioned above, although embodiment of the removal apparatus of dissolved sulfide and the removal method of dissolved sulfide concerning this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it is appropriate. It can be changed.

  For example, in the above embodiment, the reaction tank 1 has been described as an open type reaction tank having an opening in the upper part. For example, as shown in FIG. Even when the gas R containing oxygen is supplied into the gas phase in the reaction tank 1, it is possible to obtain the same operational effects as in this embodiment. Even in the case of the closed type in this way, the amount of gas R required for processing is small, and therefore the amount of gas R containing oxygen is small. Further, the gas R containing oxygen is not necessarily air. Moreover, although FIG. 2 is a figure corresponding to 1st embodiment, it cannot be overemphasized that the closed type reaction tank 11 is employable also about 2nd embodiment.

Moreover, in the said embodiment, the activated carbon advance / retreat mechanisms 3 and 13 hold | maintain the rotating shaft parts 6 and 16 and the activated carbon 2 which rotate around the axis line O1 and O3, and are attached to the rotating shaft parts 6 and 16 so that attachment or detachment is possible. The activated carbon holding means 7 and 17 are provided, and the rotating shaft portions 6 and 16 are rotated so that the activated carbon 2 is repeatedly reciprocated between the raw water W1 and the gas R containing oxygen. On the other hand, in the present invention, it is only necessary that the activated carbon 2 can be repeatedly reciprocated between the raw water W1 and the oxygen-containing gas R. There is no need to limit it.
For example, in the first embodiment, the activated carbon holding means 7 holding the activated carbon 2 may be moved back and forth in the vertical direction so that the activated carbon 2 is repeatedly reciprocated between the raw water W1 and the oxygen-containing gas R. Even in this case, it is possible to obtain the same effect as that of the present embodiment.

  In the second embodiment, the rotating shaft 16 is configured to rotate using the water flow of the treated raw water W1. However, the rotating shaft 16 includes a rotation driving unit such as an electric motor that rotates the rotating shaft 16 around the axis O3. May be. Moreover, in 2nd embodiment, although the case where the water pump 5 was not provided was demonstrated, the water pump 5 may be provided. Thus, when the rotational drive means and the water pump are provided, the bottom surface of the reaction tank 11 may be flat.

DESCRIPTION OF SYMBOLS 1,11 Reaction tank 1a, 11a Raw water supply port 1b, 11b Treated water discharge port 2 Activated carbon 3,13 Activated carbon advance / retreat mechanism 4 Water supply pipe 5 Water pump 6,16 Rotating shaft part 7,17 Activated carbon holding means 8,18 Activated carbon cartridge 9 Rotation drive means 10, 20 Mounting member A Dissolved sulfide removing device O1, O3 Axis O2 of rotating shaft part Axis R of activated carbon cartridge Gas containing oxygen (air)
W1 treated raw water (raw water to be treated)
W2 treated water

Claims (5)

An apparatus for removing dissolved sulfide from raw water in which sulfide is dissolved,
A reaction tank for temporarily storing the raw water;
Activated carbon,
An apparatus for removing dissolved sulfide, comprising: an activated carbon advancing / retreating mechanism that repeatedly circulates the activated carbon between the raw water stored in the reaction tank and a gas containing oxygen. The apparatus for removing dissolved sulfide according to claim 1,
The activated carbon advance / retreat mechanism is a rotation shaft portion rotatably supported around an axis, and
Activated carbon holding means that holds the activated carbon and is detachably supported on the rotating shaft portion;
The dissolved sulfide is provided with a rotation driving means for rotating the rotating shaft around the axis and reciprocatingly circulating the activated carbon holding means and the activated carbon between the raw water and the gas. Removal device. The apparatus for removing dissolved sulfide according to claim 2,
The apparatus for removing dissolved sulfide, wherein the activated carbon holding means is configured to be rotatable in a direction orthogonal to the water flow direction of the raw water. The apparatus for removing dissolved sulfide according to claim 1,
The activated carbon advance / retreat mechanism is a rotation shaft portion rotatably supported around an axis, and
Activated carbon holding means that holds the activated carbon and is detachably supported by the rotating shaft portion,
The apparatus for removing dissolved sulfide, wherein the activated carbon holding means is configured to be rotatable in a direction parallel to the flow direction of the raw water. A method for removing dissolved sulfide from raw water in which sulfide is dissolved,
A method for removing dissolved sulfide, wherein activated carbon is repeatedly reciprocated between raw water and oxygen-containing gas.

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