JP2010142729A - Wastewater treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wastewater treatment system which can purify wastewater for a longer period of time without stopping the system and can highly efficiently and stably treat the wastewater. <P>SOLUTION: The wastewater treatment system 1A includes an adsorption type wastewater treatment device 100, an adsorption/desorption type wastewater treatment device 200, and a condenser 300. The adsorption type wastewater treatment device 100 contains an interchangeable adsorbent 111 capable of adsorbing organic solvents contained in the wastewater, and discharges the wastewater as primary treated water. The adsorption/desorption type wastewater treatment device 200 contains adsorbents 211, 221 capable of adsorbing and desorbing organic solvents contained in the primary treated water discharged from the adsorption type wastewater treatment device 100, and treats the primary treated water continuously to discharge secondary treated water and desorbed gas. The condenser 300 condenses the desorbed gas discharged from the adsorption/desorption type wastewater treatment device 200 to discharge it as a condensate. The condensate discharged from the condenser 300 is concentrated and returned to the adsorption type wastewater treatment device 100. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wastewater treatment system that purifies the wastewater by removing the organic solvent from the wastewater containing the organic solvent, and is particularly harmful from industrial wastewater containing the organic solvent discharged from various factories and research facilities. The present invention relates to a wastewater treatment system that purifies industrial wastewater by efficiently removing organic solvents.

  Conventionally, an adsorption-type wastewater treatment device using an adsorbent such as activated carbon has been widely used as a wastewater treatment device for purifying wastewater containing an organic solvent. In this adsorption-type wastewater treatment device, the adsorbent is composed of a replaceable cartridge, and the organic solvent is adsorbed and removed by the adsorbent by bringing wastewater into contact with the adsorbent, thereby cleaning the wastewater. And discharged as clean water.

  However, in the adsorption-type wastewater treatment device, if the adsorption capacity of the adsorbent reaches saturation by continuing to adsorb the organic solvent for a certain period of time, the adsorption is not substantially performed thereafter, and the adsorbent is replaced with a new one. Alternatively, it is necessary to remove the adsorbent from the apparatus and perform the regeneration process. Therefore, in the case of a wastewater treatment system provided with such an adsorption-type wastewater treatment apparatus, wastewater cannot be treated continuously, and it is necessary to stop the wastewater treatment system itself each time.

  In addition, unlike the purification of air, the purification of water inevitably causes the growth of microorganisms, and the life of the adsorbent is shortened. Therefore, in the case of a wastewater treatment system equipped with an adsorption-type wastewater treatment device, it is necessary to frequently perform the above-described adsorption material replacement work and regeneration treatment work, which increases the labor and running costs. It was.

  In order to solve such a problem, it is conceivable to extend the replacement cycle by using a large amount of adsorbent, but it is inevitable to increase the size of the device and increase the installation cost, which is not necessarily an effective measure. I don't get it. Japanese Patent Laid-Open No. 9-77508 (Patent Document 1) proposes that the surface of activated carbon as an adsorbent is appropriately hydrophobized to improve the adsorption capacity, thereby extending the exchange period. However, even if it is effective when removing a small amount of organic solvent, it is not a fundamental solution when it is required to remove a large amount of organic solvent with high efficiency. It is not necessarily suitable for the treatment of industrial wastewater containing a large amount of organic solvent discharged from research facilities.

In general, the adsorption performance of the adsorbent decreases with time, so that it is necessary to replace the adsorbent early in order to maintain stable wastewater treatment performance. Therefore, in order to obtain stable wastewater treatment performance in a wastewater treatment system equipped with an adsorption-type wastewater treatment device, it is necessary to maintain this by accelerating the adsorbent replacement cycle. Had to be stopped.
JP-A-9-77508

  Therefore, the present invention has been made to solve the above-described problems, and it is possible to clean the wastewater without stopping the system for a longer period of time, and the wastewater can be treated efficiently and stably. An object is to provide a wastewater treatment system.

  The wastewater treatment system based on the present invention is to purify the wastewater by removing the organic solvent from the wastewater containing the organic solvent, the adsorption wastewater treatment device, the adsorption / desorption type wastewater treatment device, the condensation Device. The adsorption-type wastewater treatment apparatus includes a first adsorption element that adsorbs an organic solvent by bringing wastewater into contact with the organic solvent, and the organic solvent is adsorbed by the first adsorption element by supplying wastewater to the first adsorption element. It is discharged as primary treated water. The adsorption / desorption type wastewater treatment device is connected to the adsorption type wastewater treatment device, adsorbs organic solvent by contacting primary treated water discharged from the adsorption type wastewater treatment device, and adsorbs by contacting gas. A second adsorbing element for desorbing the organic solvent, and supplying the first treated water to the second adsorbing element so that the organic solvent is adsorbed on the second adsorbing element and discharged as secondary treated water. By supplying gas to the adsorption element, the organic solvent is desorbed from the second adsorption element and discharged as a desorption gas containing the organic solvent. Here, the adsorption-type wastewater treatment device is configured such that the first adsorption element is replaceable, and the adsorption / desorption-type wastewater treatment device adsorbs a portion where the desorption treatment of the second adsorption element is completed. The primary treated water can be continuously treated by shifting to the portion where the treatment is performed and moving the portion where the adsorption treatment of the second adsorption element is completed to the portion where the desorption treatment is performed. The condensing device is connected to the adsorption / desorption type wastewater treatment device, and condenses the desorption gas discharged from the adsorption / desorption type wastewater treatment device and discharges it as a condensate.

  In the wastewater treatment system according to the present invention, it is preferable that the condensate discharged from the condenser is supplied again to the adsorption-type wastewater treatment device as wastewater.

  The waste water treatment system according to the present invention further separates the condensate discharged from the condensing device based on the difference in specific gravity, and contains a concentrated solution containing the organic solvent at a high concentration and a low concentration of the organic solvent. It is preferable to provide a concentration / separation device that separates and discharges the separated waste water. In that case, it is preferable that the concentrated liquid discharged from the concentrated liquid separator is again supplied to the adsorption-type waste water treatment apparatus as waste water.

  In the wastewater treatment system according to the present invention, the adsorption / desorption type wastewater treatment apparatus blows off excess wastewater adhering to the second adsorption element by blowing gas to the second adsorption element to remove it. It is preferable to discharge as waste water. In that case, it is preferable that the removed waste water discharged from the adsorption / desorption type waste water treatment device is again supplied to the adsorption / desorption type waste water treatment device as primary treated water.

  In the waste water treatment system according to the present invention, each of the first adsorbing element and the second adsorbing element includes at least one member selected from the group consisting of activated carbon, activated carbon fiber, and zeolite. Is preferred.

  According to the present invention, waste water can be purified without stopping the system for a longer period of time, and a waste water treatment system capable of treating waste water with high efficiency and stability can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a system configuration diagram of a wastewater treatment system according to Embodiment 1 of the present invention. Below, with reference to this FIG. 1, the structure of the waste water treatment system 1A in this Embodiment is demonstrated.

  As shown in FIG. 1, a wastewater treatment system 1A in the present embodiment includes an adsorption wastewater treatment device 100, an adsorption / desorption wastewater treatment device 200, a condenser 300 as a condenser, and a separator as a concentrated liquid separator. 400 is mainly provided.

  The adsorption-type wastewater treatment apparatus 100 has an adsorption tank 110 in which an adsorbent 111 as a first adsorption element is accommodated. The adsorbent 111 is composed of a replaceable cartridge, and is removed from the adsorption tank 110 and replaced with a new one as necessary, or once removed from the adsorption tank 110 and subjected to a regeneration process. Replaced regularly. The adsorbent 111 adsorbs the organic solvent contained in the wastewater by contacting the wastewater. Therefore, in the adsorption-type wastewater treatment apparatus 100, the organic solvent is adsorbed by the adsorbent 111 by supplying the wastewater to the adsorbent 111, whereby the wastewater is purified and discharged as primary treated water.

  Piping lines L 1 and L 2 are connected to the adsorption tank 110. The piping line L1 is a piping line for supplying wastewater containing an organic solvent to the adsorption tank 110, and the piping line L2 is a piping line for discharging the primary treated water from the adsorption tank 110.

  Although the primary treated water discharged from the adsorption-type wastewater treatment device 100 depends on the performance of the adsorbent 111, the content of the organic solvent is greatly reduced compared to the wastewater supplied to the adsorption-type wastewater treatment device 100. However, it may contain a slight amount of organic solvent.

  The adsorbent 111 is configured by a member containing at least one of activated carbon, activated carbon fiber, and zeolite. Preferably, the adsorbent 111 is activated carbon or zeolite in the form of granules, granules or honeycombs, but more preferably activated carbon fibers. Since the activated carbon fiber has a fibrous structure with micropores on the surface, the contact efficiency with water is high, and the adsorption rate of the organic solvent in water is particularly high, which is extremely high compared to other adsorption elements. It is a member that can realize adsorption efficiency.

  The adsorption / desorption type waste water treatment apparatus 200 includes a first treatment tank 210 and a second treatment tank 220 in which adsorbents 211 and 221 as second adsorption elements are accommodated, respectively. The adsorbents 211 and 221 adsorb the organic solvent contained in the primary treated water by bringing the primary treated water into contact therewith. Therefore, in the adsorption / desorption type waste water treatment apparatus 200, the primary treated water is supplied to the adsorbents 211 and 221 so that the organic solvent is adsorbed by the adsorbents 211 and 221 so that the primary treated water is cleaned and the secondary treated water is purified. It will be discharged as treated water. Further, the adsorbents 211 and 221 desorb the adsorbed organic solvent by bringing water vapor into contact therewith. Therefore, in the adsorption / desorption-type wastewater treatment apparatus 200, the organic solvent is desorbed from the adsorbents 211 and 221 by supplying water vapor to the adsorbents 211 and 221, whereby the water vapor is discharged as a desorption gas containing the organic solvent. Will be.

  Piping lines L2, L3, L4, and L5 are connected to the first processing tank 210 and the second processing tank 220, respectively. The piping line L2 is a piping line for supplying the primary processing water discharged from the adsorption-type waste water treatment apparatus 100 to the first processing tank 210 and the second processing tank 220, and the first processing tank 210 is provided by valves V201 and V202. And the connection / disconnection state with respect to the 2nd processing tank 220 is switched. The piping line L3 is a piping line for supplying water vapor to the first processing tank 210 and the second processing tank 220, and is connected / disconnected to the first processing tank 210 and the second processing tank 220 by valves V203 and V204. Is switched. The pipe line L4 is a pipe for discharging secondary treated water from the first treatment tank 210 and the second treatment tank 220, and is connected / not connected to the first treatment tank 210 and the second treatment tank 220 by valves V205 and V206. The connection status is switched. The piping line L5 is a piping line for discharging desorption gas from the first processing tank 210 and the second processing tank 220, and is connected / disconnected to the first processing tank 210 and the second processing tank 220 by valves V207 and V208. The state is switched.

  The first treatment tank 210 and the second treatment tank 220 function alternately as an adsorption tank and a desorption tank by operating the above-described opening and closing of the valves V201 to V208. Specifically, the first treatment tank 210 is adsorbed. When functioning as a tank, the second processing tank 220 functions as a desorption tank, and when the first processing tank 210 functions as a desorption tank, the second processing tank 220 functions as an adsorption tank. . That is, the adsorption / desorption type waste water treatment apparatus 200 in the present embodiment is configured such that the adsorption tank and the desorption tank are alternately switched over time. The pipe line L2 is connected to a tank functioning as an adsorption tank among the first treatment tank 210 and the second treatment tank 220, and supplies primary treated water to the adsorption tank. Among the 1 treatment tank 210 and the 2nd treatment tank 220, it connects with the tank which is functioning as a desorption tank, and supplies water vapor | steam to the said desorption tank. In addition, the piping line L4 is connected to a tank functioning as an adsorption tank among the first treatment tank 210 and the second treatment tank 220 and discharges secondary treated water from the adsorption tank. The first treatment tank 210 and the second treatment tank 220 are connected to a tank functioning as a desorption tank, and the desorption gas is discharged.

  In addition, the secondary treated water discharged from the adsorption / desorption type waste water treatment apparatus 200 has a significantly reduced content of the organic solvent compared to the primary treated water discharged from the adsorption type waste water treatment apparatus 100, It will be purified to the extent that it can be treated as normal sewage as it is.

  The adsorbents 211 and 221 are made of a member containing at least one of activated carbon, activated carbon fiber, and zeolite. Preferably, the adsorbents 211 and 221 are activated carbon or zeolite in the form of granules, granules, or honeycombs, and more preferably activated carbon fibers. Since the activated carbon fiber has a fibrous structure with micropores on the surface, the contact efficiency with water is high, and the adsorption rate of the organic solvent in water is particularly high, which is extremely high compared to other adsorption elements. It is a member that can realize adsorption efficiency.

The physical properties of the activated carbon fibers that can be used as the adsorbents 211 and 221 are not particularly limited, but the BET specific surface area is 700 to 2000 m ² / g, and the pore volume is 0.4 to 0.9 cm ³ / g. The average pore diameter is preferably 17 to 18 mm. This is because when the BET specific surface area is less than 700 m ² / g, the pore volume is less than 0.4 m ³ / g, and the average pore diameter is less than 17 mm, the adsorption amount of the organic solvent becomes low, and the BET ratio When the surface area exceeds 2000 m ² / g, the pore volume exceeds 0.9 m ³ / g, and the average pore diameter exceeds 18 mm, the adsorption capacity for substances with small molecular weight decreases due to the large pore diameter. This is because the strength becomes weak, the cost of the material becomes high, and it becomes economically disadvantageous.

  The condenser 300 is a device that condenses the desorption gas using cooling water or the like and liquefies it, and discharges it as a condensate, and is connected to the piping lines L5 and L6, respectively. The piping line L5 is a piping line for supplying the desorption gas discharged from the above-described adsorption / desorption type waste water treatment apparatus 200 to the capacitor 300, and the piping line L6 is for discharging the condensate generated in the capacitor 300. This is a piping line.

  The separator 400 is an apparatus that separates the condensate into a concentrated liquid containing a high concentration of organic solvent and a separated waste water containing a low concentration of organic solvent by separating the condensed liquid based on the specific gravity difference. Connected to L7 and L8, respectively. The piping line L6 is a piping line for supplying the condensate discharged from the capacitor 300 to the separator 400, and the piping line L7 is a piping line for discharging the concentrated liquid separated by the separator 400 from the separator 400. The piping line L8 is a piping line for discharging the separated waste water separated by the separator 400 from the separator 400.

  In the wastewater treatment system 1 </ b> A in the present embodiment, the other end of the piping line L <b> 7 connected to the separator 400 is connected to the piping line L <b> 1 connected to the adsorption-type wastewater treatment apparatus 100. Thereby, the concentrate discharged | emitted from the separator 400 is again supplied as waste_water | drain to an adsorption | suction type waste water treatment apparatus via the piping line L7 and the piping line L1.

  On the other hand, the separated waste water discharged from the separator 400 via the piping line L8 is separated from the concentrated liquid by the separator 400, so that the content of the organic solvent is greatly reduced. It will be cleaned to such an extent that it can be processed.

  Next, with reference to FIG. 1, the details of the waste water cleaning process performed in the waste water treatment system 1A in the present embodiment will be described. The following description is based on the state where the first treatment tank 210 of the adsorption / desorption type waste water treatment apparatus 200 functions as an adsorption tank and the second treatment tank 220 functions as a desorption tank. The same process is performed when the adsorption tank and the desorption tank are switched.

  As shown in FIG. 1, the waste water is introduced into the adsorption-type waste water treatment apparatus 100 via the piping line L1. The introduced waste water is sent to the adsorption tank 110 and comes into contact with the adsorbent 111, and the organic solvent contained in the waste water is adsorbed by the adsorbent 111. The water after the organic solvent is adsorbed by the adsorbent 111 is introduced into the piping line L2 and discharged from the adsorption-type waste water treatment apparatus 100 as primary treated water.

  The primary treated water discharged from the adsorption type waste water treatment apparatus 100 is introduced into the adsorption / desorption type waste water treatment apparatus 200 via the piping line L2. The introduced primary treated water is sent to the first treatment tank 210 and comes into contact with the adsorbent 211, and the organic solvent contained in the primary treated water is adsorbed by the adsorbent 211. The water after the organic solvent is adsorbed by the adsorbent 211 is introduced into the piping line L4 and discharged from the adsorption / desorption type waste water treatment apparatus 200 as secondary treated water. The secondary treated water discharged from the adsorption / desorption type waste water treatment apparatus 200 is then treated as normal sewage.

  On the other hand, water is introduced into the adsorption / desorption type waste water treatment apparatus 200 through the piping line L3 in parallel with the introduction of the primary treated water. The introduced water vapor is sent to the second treatment tank 220 and comes into contact with the adsorbent 221 to desorb the organic solvent adsorbed on the adsorbent 221. The water vapor containing the organic solvent desorbed from the adsorbent 221 is introduced into the piping line L5 and discharged from the adsorption / desorption type waste water treatment apparatus 200 as a desorption gas.

  The desorption gas discharged from the adsorption / desorption type waste water treatment apparatus 200 is sent to the capacitor 300 via the piping line L5, and is liquefied by the capacitor 300 to become a condensed liquid. The condensate produced by the capacitor 300 is sent to the separator 400 via the piping line L6, and is separated based on the specific gravity difference in the separator 400, and the concentrate containing the organic solvent at a high concentration and the organic solvent are reduced. Separated into separated wastewater contained in concentration. The concentrate containing the organic solvent at a high concentration is introduced into the piping line L7 and discharged from the separator 400, and the separated waste water containing the organic solvent at a low concentration is introduced into the piping line L8 and discharged from the separator 400. .

  The concentrated liquid discharged from the separator 400 is introduced into the piping line L1 via the piping line L7, and then introduced into the adsorption-type waste water treatment apparatus 100 as waste water. The separated waste water discharged from the separator 400 is then treated as normal sewage.

  By adopting the wastewater treatment system 1A as described above, the adsorption / desorption type wastewater treatment device 200 functions as a backup device for the adsorption type wastewater treatment device 100, and the adsorption / desorption type wastewater treatment device 200 continuously. Since the treatment can be performed, the replacement cycle of the adsorbent 111 of the adsorption-type wastewater treatment apparatus 100 can be made longer than when a wastewater treatment system is constructed with only the adsorption-type wastewater treatment apparatus 100. Therefore, it can be set as the waste water treatment system which can purify waste water, without stopping a system for a long period of time. Therefore, the number of operations for exchanging the cartridge-type adsorbent with a new one in the adsorption-type wastewater treatment apparatus or removing the regeneration treatment can be reduced, and the increase in labor and running cost can be suppressed.

  In addition, by adopting the wastewater treatment system 1A as described above, the adsorption treatment and the desorption treatment are alternately and continuously repeated in the first treatment tank 210 and the second treatment tank 220 of the adsorption / desorption type wastewater treatment apparatus 200. Become. Thus, by comprising so that adsorption | suction processing and desorption processing may be repeated alternately and continuously, the organic solvent contained in waste_water | drain can be removed stably with high capability at low cost. Therefore, by adopting the above configuration, it is possible to provide a wastewater treatment system capable of cleaning wastewater with high efficiency and stability. In particular, by adopting the adsorption / desorption type waste water treatment apparatus 200 as described above, it is possible to suppress the growth of microorganisms and to prevent the generation of algae.

  In general, it is known that the adsorption efficiency of the adsorbent improves as the concentration of the organic solvent contained in the wastewater to be treated increases. For this reason, like the wastewater treatment system 1A in the present embodiment, the concentrated liquid discharged from the separator 400 is supplied again to the adsorption-type wastewater treatment apparatus 100 as wastewater, thereby improving the adsorption performance of the adsorption-type wastewater treatment apparatus 100. In addition, the harmful organic solvent can be removed more stably and with high capacity. Therefore, by adopting the above configuration, it is possible to provide a wastewater treatment system capable of cleaning wastewater with high efficiency and stability also from this viewpoint.

  Furthermore, the wastewater treatment system 1A as in the present embodiment adds an adsorption / desorption type wastewater treatment device 200, a capacitor 300, a separator 400, and the like to an existing wastewater treatment system having only an adsorption type wastewater treatment device. Therefore, it is possible to effectively use existing facilities, and the cost efficiency is excellent.

  In the above-described wastewater treatment system 1A in the present embodiment, the case where the concentrated liquid discharged from the separator 400 is again supplied to the adsorption-type wastewater treatment apparatus 100 has been described as an example. There is no need for such a configuration, and the concentrated liquid discharged from the separator 400 may be collected and separately processed. Further, in the wastewater treatment system 1A according to the present embodiment, the case where the separator 400 is provided and the condensate is further concentrated has been described as an example. The waste water may be supplied again to the adsorption-type waste water treatment apparatus 100 as waste water, or the condensate may be collected and treated separately without providing the separator 400.

  Further, in the wastewater treatment system 1A in the above-described embodiment, when the adsorption / desorption type wastewater treatment apparatus 200 having a configuration in which the first treatment tank 210 and the second treatment tank 220 are alternately replaced with the adsorption tank and the desorption tank is employed. However, an adsorption / desorption type waste water treatment device having a different configuration may be adopted. Hereinafter, an example thereof will be described with reference to FIGS.

  FIG. 2 and FIG. 3 are schematic views showing examples of other adsorption / desorption type waste water treatment devices that can be used in the waste water treatment system according to the present embodiment. 2 and 3, only the adsorbent provided in the adsorption / desorption type waste water treatment apparatus and the components arranged in the vicinity of the adsorbent are shown, and the other components are not shown. .

  FIG. 2 shows a case where an adsorbent 250 having a cylindrical outer shape is used. As shown in FIG. 2, when using an adsorbent 250 having a cylindrical outer shape, a rotation shaft 261 is provided at the axial center of the adsorbent 250 configured to allow fluid to flow in the axial direction. The rotary shaft 261 is rotationally driven by an actuator or the like. Then, piping lines L2 to L5 (see FIG. 1) not shown in FIG. 2 are connected in the vicinity of both end faces in the axial direction of the adsorbent 250, and a part for adsorbing a part of the adsorbent 250 ( 2 is used as a portion (denoted by reference numeral 252 in FIG. 2). That is, the primary treated water is introduced from one side in the axial direction into the portion indicated by the reference numeral 251 of the adsorbent 250 and the secondary treated water is derived from the other in the axial direction. In the portion shown, water vapor is introduced from one side in the axial direction, and desorbed gas is led out from the other side in the axial direction.

  Here, in the adsorption / desorption type waste water treatment apparatus shown in FIG. 2, the adsorbent 250 rotates at a predetermined speed in the direction of arrow A in FIG. As a result, the portion where the adsorption process of the adsorbent 250 is completed moves to the zone where the desorption process is performed, and the portion where the desorption process of the adsorbent 250 is completed moves to the zone where the adsorption process is performed. Therefore, in the adsorption / desorption type waste water treatment apparatus, the adsorption process and the desorption process are simultaneously performed, and the cleaning process can be continuously performed.

  FIG. 3 shows a case where an adsorbent 270 having a cylindrical outer shape is used. As shown in FIG. 3, when using an adsorbent 270 having a cylindrical outer shape, for example, a unit adsorbing unit 275 surrounded by a metal frame 285 so that fluid can flow in the radial direction. Are arranged in the circumferential direction into a cylindrical shape, and this is rotationally driven around the axis by an actuator (not shown). Then, piping lines L2 to L5 (see FIG. 1) not shown in FIG. 3 are connected in the vicinity of the adsorbent 270, and a portion for adsorbing a part of the unit adsorption unit of the adsorbent 270 (FIG. 3). In FIG. 3, the other part of the unit adsorption unit is used as a part (denoted by reference numeral 272 in FIG. 3). That is, to the unit adsorption unit indicated by reference numeral 271 of the adsorbent 270, the primary treated water is introduced from the radially outer side, the secondary treated water is led toward the radially inner side, and discharged toward one of the axial directions. Thus, water vapor is introduced into the unit adsorption unit indicated by reference numeral 272 of the adsorbent 270 from the radially inner side through the introduction pipe 281, and the desorption gas is led out radially outward to pass through the lead-out pipe 282. It will be discharged through.

  Here, in the adsorption / desorption type waste water treatment apparatus shown in FIG. 3, the adsorbent 270 rotates stepwise around the axis at a predetermined speed in the direction of arrow A in the figure. As a result, the unit adsorption unit for which the adsorption process of the adsorbent 270 is completed moves to the zone for performing the desorption process, and the unit adsorption unit for which the desorption process for the adsorbent 270 is completed moves to the zone for performing the adsorption process. become. Therefore, in the adsorption / desorption type waste water treatment apparatus, the adsorption process and the desorption process are simultaneously performed, and the cleaning process can be continuously performed.

  When the adsorbents 250 and 270 having the shapes as shown in FIGS. 2 and 3 are used, the adsorbents 250 and 270 are made of a granular material or a fibrous material. Although it is good, it is more preferable to comprise a honeycomb structure. This is because the adsorbents 250 and 270 are made of a honeycomb-like structure, so that the pressure loss can be suppressed to an extremely low level, the processing capacity is increased, and clogging due to solids such as dust is prevented. This is because the occurrence can be suppressed relatively low.

(Embodiment 2)
FIG. 4 is a schematic diagram showing the configuration of the wastewater treatment system according to Embodiment 2 of the present invention. In FIG. 4, illustration of the same parts as the waste water treatment system 1A in the first embodiment of the present invention is omitted. Below, with reference to this FIG. 4, the structure of the waste water treatment system 1B in this Embodiment is demonstrated.

  As shown in FIG. 4, the wastewater treatment system 1B in the present embodiment is different from the above-described wastewater treatment system 1A in the first embodiment of the present invention in the configuration of the adsorption / desorption type wastewater treatment apparatus 200. In the wastewater treatment system 1B in the present embodiment, a piping line L9 for introducing gas to the adsorption / desorption type wastewater treatment device 200 is connected to the piping line L3 for introducing water vapor to the adsorption / desorption type wastewater treatment device 200. Valves V291 and V292 for switching the connection / disconnection state of the pipe lines L3 and L9 to the adsorption / desorption type waste water treatment apparatus 200 are provided in the pipe lines L3 and L9, respectively. In the wastewater treatment system 1B according to the present embodiment, a pipe for discharging the removed wastewater from the adsorption / desorption type wastewater treatment apparatus 200 to the pipe line L5 for discharging the desorption gas from the adsorption / desorption type wastewater treatment apparatus 200. Line L10 is connected, and valves V293 and V294 for switching the connection / disconnection state of these piping lines L5 and L10 to the adsorption / desorption type waste water treatment apparatus 200 are provided in the piping lines L5 and L10, respectively. The other end of the piping line L10 is connected to a piping line L2 for introducing primary treated water into the adsorption / desorption type waste water treatment apparatus 200.

  In the adsorption / desorption type wastewater treatment apparatus 200 of the wastewater treatment system 1B in the present embodiment, a dehydration process (purge process) is performed between the adsorption process and the desorption process. Specifically, as in the case of the wastewater treatment system 1A according to Embodiment 1 of the present invention described above, in the adsorption / desorption type wastewater treatment apparatus 200, the first treatment is performed by opening and closing the valves V201 to 208. The tank 210 and the second treatment tank 220 are alternately switched to the adsorption tank and the desorption tank. When the tank 210 and the second treatment tank 220 are switched to the desorption tank, first, the desorption tank is connected to the piping line L9 and the piping line L10, and the piping line L9 is connected. A dehydration process is performed to blow off excess drainage adhering to the surface of the adsorbent by introducing gas into the desorption tank via the desorption tank and spraying the adsorbent on the adsorbent, and the removed drainage that has been blown off is the piping line L10 and the piping line L2. Then, it is supplied again to the adsorption / desorption type waste water treatment apparatus 200. Then, after the dehydration process is performed for a predetermined time, the connection between the desorption tank and the piping line L9 and the piping line L10 is released, and the piping line L3 and the piping line L5 are connected to the desorption tank and the desorption process is performed. The gas introduced into the desorption tank during the dehydration process is preferably a high temperature and low humidity gas. For example, it is preferable to use dry air heated to a predetermined temperature. .

  By adopting the configuration as in the wastewater treatment system 1B in the present embodiment described above, the effect obtained when the configuration as in the wastewater treatment system 1A in the first embodiment of the present invention described above is employed. In addition, since the desorption efficiency of the organic solvent from the adsorbents 211 and 221 is greatly increased, an effect of being able to provide a wastewater treatment system capable of cleaning wastewater with higher efficiency and stability can be obtained. In the above-described embodiment, the case where the removed wastewater discharged from the adsorption / desorption type wastewater treatment apparatus 200 is configured to be supplied again to the adsorption / desorption type wastewater treatment apparatus 200 will be described as an example. However, the removal waste water may be configured to be cleaned using a device such as the above-described adsorption-type waste water treatment device 100 separately.

  In the wastewater treatment systems 1A and 1B according to the first and second embodiments of the present invention described above, the desorption treatment of the organic solvent is performed by bringing water vapor into contact with the adsorbents 211 and 221 of the adsorption / desorption type wastewater treatment apparatus 200. However, there are various other gases that can be used for the desorption process. For example, when the organic solvent adsorbed by the adsorbents 211 and 221 has a relatively high boiling point, it is possible to use heated air, and its use is not limited as long as it is a high-temperature gas.

  Further, the characteristic configurations of the wastewater treatment systems 1A and 1B in the first and second embodiments of the present invention described above can be combined with each other. For example, the adsorption / desorption type wastewater treatment apparatus including the adsorbents 250 and 270 configured as shown in FIGS. 2 and 3 is applied to the adsorption / desorption type wastewater treatment apparatus 200 of the wastewater treatment system 1B according to Embodiment 2 of the present invention. May be. In this case, a zone for performing the dehydration process is provided in the zone for performing the desorption process of the adsorption elements 250 and 270, and a portion of the adsorption elements 250 and 270 located in the zone for performing the dehydration process is provided. The above-described piping lines L9 and L10 are connected in proximity to each other, and the adsorption / desorption type waste water treatment apparatus 200 is configured so that the dehydration process is performed between the adsorption process and the desorption process.

  Further, in the first and second embodiments of the present invention described above, the description has been made without particularly showing the components such as the fluid conveying means such as the pump and the fan and the fluid storing means such as the storage tank. What is necessary is just to arrange | position a component in an appropriate position as needed.

  Thus, the above-described embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a system configuration diagram of a wastewater treatment system according to Embodiment 1 of the present invention. It is a schematic diagram which shows the example of the other adsorption / desorption type waste water treatment equipment which can be utilized in the waste water treatment system in Embodiment 1 of this invention. It is a schematic diagram which shows the example of the other adsorption / desorption type waste water treatment equipment which can be utilized in the waste water treatment system in Embodiment 1 of this invention. It is a system block diagram of the waste water treatment system in Embodiment 2 of this invention.

Explanation of symbols

  1A, 1B Wastewater treatment system, 100 adsorption wastewater treatment device, 110 adsorption tank, 111 adsorbent, 200 adsorption / desorption wastewater treatment device, 210 first treatment tank, 211 adsorbent, 220 second treatment tank, 221 adsorbent, 250 Adsorbent, 261 Rotating shaft, 270 Adsorbent, 275 Unit adsorption unit, 281 Inlet pipe, 282 Lead pipe, 285 Frame, 300 Capacitor, 400 Separator, L1-L10 piping line, V201-V208, V291-V294 Valve.

Claims (7)

A wastewater treatment system that purifies the wastewater by removing the organic solvent from the wastewater containing the organic solvent,
An adsorption type including a first adsorbing element that adsorbs an organic solvent by bringing wastewater into contact with the organic solvent, and supplying the first adsorbing element to adsorb the organic solvent to the first adsorbing element and discharging it as primary treated water. Wastewater treatment equipment,
The second adsorption is connected to the adsorption-type wastewater treatment device, adsorbs the organic solvent by contacting the primary treated water discharged from the adsorption-type wastewater treatment device, and desorbs the adsorbed organic solvent by contacting the gas. By supplying primary treated water to the second adsorbing element, adsorbing the organic solvent to the second adsorbing element and discharging it as secondary treated water, and supplying gas to the second adsorbing element. An adsorption / desorption type wastewater treatment device for desorbing an organic solvent from the second adsorbing element and discharging it as a desorption gas containing the organic solvent;
A condensing device connected to the adsorption / desorption type wastewater treatment device, condensing the desorption gas discharged from the adsorption / desorption type wastewater treatment device and discharging it as a condensate,
The adsorption-type wastewater treatment device is configured such that the first adsorption element is replaceable,
The adsorption / desorption type wastewater treatment apparatus shifts a portion where the desorption process of the second adsorption element is completed to a portion where the adsorption process is performed, and changes a portion where the adsorption process of the second adsorption element is completed to a portion where the desorption process is performed. Wastewater treatment system that can treat primary treated water continuously by shifting.   The wastewater treatment system according to claim 1, wherein the condensate discharged from the condenser is supplied again to the adsorption-type wastewater treatment device as wastewater.   Concentrated liquid separation that separates and discharges the condensate discharged from the condensing device into a concentrated liquid containing a high concentration of an organic solvent and a separated waste water containing a low concentration of an organic solvent. The wastewater treatment system according to claim 1, further comprising a device.   The wastewater treatment system according to claim 3, wherein the concentrate discharged from the concentrated liquid separator is supplied again to the adsorption-type wastewater treatment device as wastewater.   The said adsorption / desorption type waste water treatment apparatus blows off the excessive waste_water | drain adhering to the said 2nd adsorption | suction element by blowing gas to the said 2nd adsorption | suction element, and discharges this as removal waste_water | drain. The wastewater treatment system described in 1.   The wastewater treatment system according to claim 5, wherein the removed wastewater discharged from the adsorption / desorption type wastewater treatment device is again supplied to the adsorption / desorption type wastewater treatment device as primary treated water.   The waste water treatment according to any one of claims 1 to 6, wherein each of the first adsorption element and the second adsorption element includes at least one member selected from the group consisting of activated carbon, activated carbon fiber, and zeolite. system.

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