JP4795992B2 - Freeze concentration wastewater treatment equipment - Google Patents

Description

  The present invention relates to a freeze-concentrated wastewater treatment apparatus suitable for obtaining, for example, water that can be used for irrigation from wastewater or using it as intermediate water.

  In order to green the desert area, it is necessary to secure a large amount of irrigation water, and furthermore, it is necessary to keep the costs required to secure the irrigation water low.

Examples of methods for securing irrigation water and relatively clean water used for such greening include freeze concentration methods for obtaining irrigation water from wastewater and seawater discharged from urban areas, evaporation concentration methods, membrane concentration methods, and the like. Laws are known.
Among these methods, a method of obtaining irrigation water or the like continuously with respect to the freeze concentration method, a method of obtaining irrigation water or the like at a relatively low cost, and the like have been proposed (for example, see Patent Documents 1 to 3).
Moreover, the technique of the apparatus which manufactures the ice which can be utilized for the freeze concentration method continuously is proposed (for example, refer patent document 4 and 5).
Japanese Patent Laid-Open No. 11-30413 JP-A-6-277655 JP 2002-130879 A Japanese Utility Model Publication No. 58-114478 JP-A-1-95263

  As described above, in the wastewater reuse system that obtains irrigation water etc. from the wastewater etc. using the freeze concentration method, the separation efficiency for separating the adhering water such as wastewater attached to the generated ice from the ice is obtained. It has a great impact on improving water quality.

  Therefore, a centrifugal separation method that separates adhering water from ice is known, but the energy used to separate adhering water is large, and it is expensive to put the reused water obtained into the market as irrigation water. There was a problem of becoming.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a freeze-concentration wastewater treatment apparatus that can ensure the quality of reused water and can reduce costs. .

In order to achieve the above object, the present invention provides the following means.
The freeze concentration type waste water treatment apparatus of the present invention includes an ice generation unit that generates ice and concentrated waste water from waste water, a transport unit that transports the ice from the ice generation unit, and melted and recovered water that has been transported. A recovery unit to generate, a sprinkling unit that applies one or both of the drainage and the recovered water to the ice transported to the transport unit, and transporting the ice transported by the transport unit to the recovery unit, A reversing conveyance unit that reverses the top and bottom of the ice when receiving the ice from the conveyance unit, and a washing unit that applies one or both of the drainage and the recovered water to the ice conveyed to the reversal conveyance unit; Is provided.

According to the present invention, concentrated drainage adhered to ice is washed away by applying one or both of drainage and recovered water to the transported ice. Then, by melting the ice in the recovery section, the quality of recovered water (reused water) can be improved as compared with the case where the concentrated drainage is not washed away.
In addition, in order to ensure the quality of the recovered water, only one or both of the drained water and the recovered water is applied to the ice from the sprinkler compared to the method of removing the concentrated waste water adhering to the ice using a centrifugal separation method or the like. The energy used can be reduced.

  In the above-mentioned invention, it is desirable that one or both of the waste water and the recovered water applied to the ice from the water sprinkling part is supplied to the ice generating part.

According to the present invention, one or both of waste water from which concentrated waste water adhering to ice is washed away and recovered water are cooled by ice. On the other hand, when one or both of the waste water and the recovered water are applied, the molten water having a low melting temperature is supplied to the ice generating unit together with one or both of the above-described waste water and the recovered water. Therefore, it is possible to reduce the energy required to generate ice in the ice generation unit.
In other words, the cold heat lost when removing the concentrated drainage adhering to the ice can be used for the next generation of ice.

  In the said invention, it is desirable to provide the drainage hole into which one or both of the said waste_water | drain drained from the said watering part and the said recovered water flows in in the surface which mounts the said ice in the said conveyance part.

  According to the present invention, one or both of drained water and recovered water, concentrated drained water washed away from ice, dissolved water that has melted ice, etc. flow into the drainage holes, and these drainage can be easily removed from the ice. Can be separated.

  In the above invention, the ice transported by the transport unit is transported to the recovery unit, and when the ice is received from the transport unit, the ice is turned upside down. It is desirable that a cleaning unit that applies one or both of the drainage and the recovered water to the transported ice is provided.

  According to the present invention, one or both of the drainage and the recovered water can be applied to the ice from a direction different from the direction in which one or both of the drainage and the recovered water is applied by the watering portion. For this reason, it is possible to more reliably wash away the adhering water adhering to the ice.

  In the said invention, it is desirable to provide the dehydration part which removes the adhering water adhering to the said ice before the said ice enters into the said collection | recovery part.

  According to the present invention, since the adhering water containing the waste water is removed from the ice, only the ice can be supplied to the recovery unit, and the quality of the recovered water can be improved.

  In the above invention, the ice generation unit includes a cooling unit that cools the wastewater to a supercooled state, a supercooling release unit that releases the supercooled state of the wastewater to generate ice and concentrated wastewater, and It is desirable to provide ice and an ice storage tank in which the concentrated drainage is stored.

According to the reference example of the present invention , it is possible to continuously generate ice by generating supercooled wastewater continuously in the cooling unit and releasing the supercooled state of wastewater. The generated ice is stored in the ice storage tank together with the concentrated waste water generated at the same time, and then transferred to the recovery unit by the transfer unit, so that recovered water can be obtained.
Compared with a static type ice generating unit that generates solid ice, ice can be generated continuously, so that recovered water can be obtained at low cost.

  In the above invention, the transport unit has at least a horizontal part extending substantially horizontally and an inclined part inclined, and the horizontal part is disposed below the surface of the concentrated drainage stored in the ice storage tank, It is desirable that the inclined portion is arranged so as to extend from below the surface of the concentrated waste water toward the outside of the ice storage tank.

  According to the present invention, by driving the transport unit, the ice floating on the concentrated drainage on the horizontal part is collected on the inclined part, and the ice is placed on the inclined part, taken out from the concentrated drainage, and transported to the recovery unit. it can. Compared with the case where the horizontal portion is not provided, since ice can be collected on the inclined portion, a lot of ice can be placed on the inclined portion.

  In the above invention, the ice generating unit includes a drainage tank in which drainage is stored, an ice making drum that is in contact with the drainage and forms ice on a cylindrical surface while rotating, and strips ice from the cylindrical surface. It is desirable that a stripping unit for placing the removed and stripped ice on the transport unit is provided.

According to the present invention, the ice formed on the cylindrical surface of the ice making drum is stripped off by the stripping unit and transported to the collecting unit by the transporting unit.
Compared to the method of generating ice by releasing the supercooled state after the wastewater is brought into a supercooled state, the concentrated wastewater is less likely to be contained in the ice, and the quality of the recovered water is easily improved.

  According to the freeze concentration type waste water treatment apparatus of the present invention, water quality of recovered water (reused water) is obtained by washing drained water and recovered water over one or both of the transported ice and washing away the concentrated waste water adhering to the ice. As a result, the cost can be reduced.

[First Embodiment]
Hereinafter, the waste water treatment apparatus according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a schematic diagram illustrating the configuration of the wastewater treatment apparatus according to the present embodiment.
As shown in FIG. 1, a wastewater treatment device (freezing wastewater treatment device) 1 includes a raw water tank 2 in which wastewater is temporarily stored, an ice generation unit 3 that generates ice and concentrated wastewater from the wastewater, There are provided a transport unit 4 for transporting the ice, a sprinkling unit 5 for washing out the water adhering to the ice, and a recovery unit 6 for generating recovered water from the ice.

The raw water tank 2 is a tank to which wastewater discharged from an urban area is supplied, and temporarily stores the wastewater before being processed in the wastewater treatment apparatus 1.
The raw water tank 2 is provided with a raw water filter 7 that removes solids contained in the waste water, and the waste water that has passed through the raw water filter 7 is guided to the raw water pump 8.

  The ice generating unit 3 includes a cooling unit 9 that cools the wastewater to a supercooled state, a supercooling release unit 10 that releases the supercooled state of the wastewater, and a circulation tank (ice storage tank) that stores ice and concentrated wastewater. 11).

FIG. 2 is a schematic diagram for explaining a part of the configuration of the cooling unit in FIG. 1.
As shown in FIGS. 1 and 2, the cooling unit 9 is provided with a heat exchange unit 12 and a brine unit 13.

The heat exchange unit 12 performs heat exchange between the brine supplied from the brine unit 13 and the drainage supplied from the raw water pump 8.
As shown in FIG. 1, waste water is supplied from the raw water pump 8 to the heat exchange unit 12, and concentrated waste water is supplied from the circulation pump 19. On the other hand, the waste water cooled to the supercooled state and the concentrated waste water are supplied from the heat exchange unit 12 to the supercooling release unit 10.
Further, as shown in FIG. 2, brine is supplied from the brine pump 16 to the heat exchange unit 12, and the brine after heat exchange with waste water or the like is supplied from the heat exchange unit 12 to the blower 14.

The brine part 13 supplies the cooled brine to the heat exchange part 12, as shown in FIG.
The brine unit 13 is provided with a brachinler 14 for cooling the brine, a brine tank 15 for temporarily storing the brine, and a brine pump 16 for sending the brine.

The brine rattle 14 is supplied with the heat-exchanged brine from the heat exchanging unit 12 and a part of the brine sent from the brine pump 16. The brine after cooling is supplied from the brachinler 14 to the brine tank 15.
The brine after the cooling is temporarily stored in the brine tank 15, and the cooled brine is guided from the brine tank 15 to the brine pump 16.
The brine pump 16 supplies the cooled brine stored in the brine tank 15 to the heat exchange unit 12 and the branler 14.

The supercooling release unit 10 releases the supercooled state such as the wastewater supplied from the heat exchange unit 12 and generates ice and concentrated wastewater (concentrated wastewater).
The supercooling release unit 10 is provided with a storage unit 17 that temporarily stores drainage and the like, and a stirring unit 18 that stirs the drainage and releases the supercooled state.

The storage unit 17 is a container that receives the supercooled drainage supplied from the heat exchange unit 12. A stirring unit 18 is provided inside the storage unit 17.
The agitation unit 18 agitates the supercooled wastewater and the like to release the supercooled state, and generates ice composed of clean water from the wastewater and the like, and as a result, generates concentrated wastewater enriched with salts and the like. Is. The stirring unit 18 includes a propeller unit that stirs the supercooled drainage and the like, and a drive unit that rotationally drives the propeller unit.

The circulation tank 11 is arrange | positioned under the supercooling cancellation | release part 10, and the ice and concentrated drainage which were produced | generated by the supercooling cancellation | release part 10 are temporarily stored.
Connected to the circulation tank 11 is a circulation pump 19 for supplying concentrated wastewater to the heat exchange unit 12. Between the circulation pump 19 and the heat exchange unit 12, an ice core filter 20 that collects ice flowing into the heat exchange unit 12 is disposed. Furthermore, a drain unit 21 is provided between the circulation pump 19 and the ice core filter 20 to discharge concentrated waste water concentrated to a certain concentration or more.

  Inside the circulation tank 11, ice and concentrated drainage are supplied from the supercooling release unit 10, and an area where the ice and concentrated drainage exist (the right side area in FIG. 1) and an area where only concentrated drainage exists (in FIG. 1). A partition plate 22 forming a left side region) is provided. The partition plate 22 has an upper end protruding above the surface of the concentrated drainage, and a lower end spaced from the bottom surface of the circulation tank 11 so that the concentrated drainage can flow.

  As shown in FIG. 1, the transport unit 4 transports the generated ice from the circulation tank 11 to the collection unit 6. In the present embodiment, the conveyance unit 4 will be described as applied to a belt conveyor. In addition, the conveyance part 4 may be a belt conveyor as mentioned above, and may be another conveyance apparatus, and is not specifically limited.

FIG. 3 is a partially enlarged view illustrating the configuration of the transport unit in FIG.
As shown in FIGS. 1 and 3, a horizontal portion 23 in which the belt conveyor extends in the horizontal direction is provided at the approximate center of the transport portion 4. The belt constituting the belt conveyor of the transport unit 4 is provided with a drain hole 24.

  The drain hole 24 is a through hole into which one or both of drainage and recovered water applied to the ice from the sprinkler 5, adhering water adhering to the ice, and melted water that has melted the ice flow into the circulation tank 11. . The drain holes 24 may be arranged in a zigzag pattern, or may be arranged in other patterns, and are not particularly limited. Further, the diameter of the drain hole 24 is limited to such a size that the ice does not fall.

The water sprinkling unit 5 is for washing away the adhering water (concentrated waste water) adhering to the ice pulled up from the circulation tank 11 by the transport unit 4. The water sprinkling part 5 is disposed above the horizontal part 23 of the transport part 4. The sprinkler 5 is supplied with a part of the waste water sent from the raw water pump 8 or a part of the recovered water sent from the pump 27 through the valve 34.
As the water sprinkling part 5, a structure such as a shower that sprinkles one or both of drainage and recovered water can be adopted.

  The recovery unit 6 melts the ice transported by the transport unit 4 to obtain recovered water. Here, the recovered water is water that has a lower content of salts and the like than wastewater and can be used as so-called middle water such as irrigation water.

As shown in FIG. 1, the recovery unit 6 includes an ice recovery tank 26, a recovery pump 27, and a fan coil unit 28.
The ice recovery tank 26 is a container in which the ice transported by the transport unit 4 is stored. On the bottom of the ice recovery tank 26, there is disposed a bottom surface 29 through which only the recovered water in which the ice has melted permeates and an inclined surface that collects the recovered water on the recovery pump 27 side below the bottom surface 29. 30 is provided.

The recovery pump 27 sends the recovered water obtained in the ice recovery tank 26 to the outside or the fan coil unit 28.
Between the recovery pump 27 and the fan coil unit 28, a three-way valve 31 for controlling the flow of recovered water sent from the recovery pump 27 is disposed. The three-way valve 31 is supplied with the output of a level sensor 32 that detects the level of recovered water collected in the ice recovery tank 26. The three-way valve 31 controls the outflow direction of the recovered water based on the output of the level sensor 32.

  The fan coil unit 28 exchanges heat between the recovered water and the external air, raises the temperature of the recovered water, and cools the external air. The recovered water whose temperature has risen is returned to the ice recovery tank 26 and used to melt the ice in the ice recovery tank 26.

Next, a method for recovering recovered water from wastewater by the wastewater treatment apparatus 1 having the above-described configuration will be described.
As shown in FIG. 1, wastewater discharged from urban areas or the like flows into the raw water tank 2. The waste water flowing into the raw water tank 2 passes through the raw water filter 7 and is guided to the raw water pump 8. The drainage passes through the raw water filter 7 to remove solids contained in the drainage. The waste water flowing into the raw water tank 2 has a temperature of about 20 ° C.
The waste water flowing into the raw water pump 8 is sent out toward the heat exchange unit 12 and the water sprinkling unit 5. In addition, delivery of the waste water to the heat exchange unit 12 and the water sprinkling unit 5 is controlled by a flow control valve or the like.

The wastewater sent from the raw water pump 8 and the concentrated wastewater circulated from the circulation tank 11 (hereinafter referred to as wastewater or the like) pass through the ice core filter 20 and flow into the heat exchange unit 12. By disposing the ice core filter 20, it is possible to remove ice contained in the permeating drainage and the like, and it is possible to prevent the ice from adhering inside the heat exchanging portion 12 or the like.
The drainage or the like that has flowed into the heat exchange unit 12 is cooled to a supercooled state and flows out toward the supercooling release unit 10.

As shown in FIG. 1 and FIG. 2, the heat exchange unit 12 is supplied with brine cooled by the Blainchler 14, and performs heat exchange between the brine and drainage. Thereby, drainage etc. are cooled to a supercooled state.
On the other hand, the brine after the heat exchange is returned to the blower 14 and cooled again.

The drainage or the like cooled to the supercooled state flows into the storage unit 17 of the supercooling release unit 10. The supercooled wastewater or the like in the storage unit 17 is agitated by the agitating unit 18 to release the supercooled state.
When the supercooled state is released, the drainage and the like generate ice made of clean water that does not contain salts. At the same time, concentrated waste water is produced in which salts and the like not contained in ice are concentrated.

The ice and concentrated waste water generated by the supercooling release unit 10 flows from the storage unit 17 into the circulation tank 11 disposed below.
Ice and concentrated drainage flow into one area (the right area in FIG. 1) partitioned by the partition plate 22 of the circulation tank 11. The ice stays only in one region partitioned by the partition plate 22, and the concentrated drainage flows from one region to the other region (the left region in FIG. 1).

The concentrated wastewater stored in the circulation tank 11 is sent again to the heat exchange unit 12 via the ice core filter 20 by the circulation pump 19.
When the concentration of the concentrated wastewater stored in the circulation tank 11 becomes higher than a predetermined concentration, the concentrated wastewater is discharged from a discharge valve 33 that is a three-way valve disposed between the circulation pump 19 and the ice core filter 20. It is discharged outside.

Ice in the circulation tank 11 is scooped up from the concentrated drainage by the transport unit 4. The concentrated drainage adhering around the ice scooped up by the transport unit 4 falls downward due to gravity and falls into the circulation tank 11 from the drainage hole 24.
Thereafter, the ice reaches the horizontal part 23 of the transport part 4, and one or both of drainage and recovered water are poured from the sprinkling part 5 arranged above. One or both of the waste water and the recovered water wash away the concentrated waste water adhering around the ice, and fall into the circulation tank 11 from the drain hole 24 together with the washed concentrated waste water.
On the other hand, the waste water sprayed from the water sprinkling part 5 is waste water before being cooled by the heat exchanging part 12, and has a higher temperature than ice. Therefore, this drainage can melt a part of ice, wash away the concentrated drainage adhering to the ice more reliably, and improve the removal rate of the concentrated drainage.

  In addition, one or both of the waste water and the recovered water from which the concentrated waste water adhered to the ice is washed out is cooled by the ice and the concentrated waste water and flows into the circulation tank 11. Then, it is cooled to a supercooled state by the heat exchange unit 12.

The ice washed away from the concentrated wastewater adhering to the horizontal portion 23 is further transported by the transporting portion 4, and after the attached water adhering to the ice is drained, it is dropped into the ice recovery tank 26.
Ice accumulates on the bottom surface 29 in the ice recovery tank 26, passes through the fan coil unit 28, and is applied with recovered water having a high temperature. As a result, the ice melts and becomes recovered water, passes through the bottom surface 29 and flows into the recovered water pump 27.

The recovered water pump 27 sends recovered water toward the three-way valve 31. The three-way valve 31 allows the recovered water to flow toward the fan coil unit 28 when the surface of the recovered water in the ice recovery tank 26 is below a predetermined position.
The recovered water that has flowed into the fan coil unit 28 exchanges heat with the outside air to cool the outside air. The cooled air is used for indoor air conditioning. On the other hand, the temperature of the recovered water after heat exchange increases due to the heat of the external air. The recovered water whose temperature has risen is led to the ice recovery tank 26 and used to melt the ice.

  On the other hand, when the level of the recovered water in the ice recovery tank 26 reaches a predetermined position, the three-way valve 31 allows the recovered water to flow outward.

According to said structure, the concentrated waste_water | drain adhering to ice is washed away by applying one or both of waste_water | drain and recovery water to the conveyed ice. Thereafter, by melting the ice in the ice collection tank 26 of the collection unit 6, the quality of the collected water can be improved as compared with the case where the concentrated drainage is not washed away.
Furthermore, compared with the method of removing concentrated wastewater adhering to ice by using a centrifugal separation method or the like, only one or both of the wastewater and recovered water is sprinkled on the ice from the sprinkling unit 5, so that the quality of recovered water is ensured. It is possible to reduce the energy used for the operation. That is, it is possible to secure the quality of the recovered water and reduce the cost required to obtain the recovered water.
By washing away the concentrated wastewater adhering to ice, the chlorine concentration and chemical oxygen demand (COD) in the recovered water can be lowered.

Ice can be continuously generated by continuously generating supercooled drainage or the like in the heat exchanging unit 12 of the cooling unit 9 and releasing the supercooled state of drainage or the like. The generated ice is stored in the circulation tank 11 together with the concentrated waste water generated at the same time, and then transferred to the ice recovery tank 26 of the recovery unit 6 by the transfer unit 4, so that recovered water can be obtained.
Since ice can be continuously generated in this manner, recovered water can be obtained at a lower cost than a static ice generating unit that generates solid ice.

Either or both of waste water from which the concentrated waste water adhering to ice has been washed away and recovered water are cooled by ice. On the other hand, when one or both of the drainage and the recovered water are applied, the melted water having a low temperature is supplied to the heat exchanging unit 12 of the ice generating unit 3 together with one or both of the drainage and the recovered water. Therefore, it is possible to reduce the energy required for generating ice in the ice generating unit 3.
In other words, the cold heat lost from the ice when removing the concentrated drainage adhering to the ice can be used for the next ice production.

  By providing the drainage hole 24 in the transport unit 4, one or both of drained water and recovered water, concentrated drainage washed away from ice, dissolved water that has melted ice, and the like flow into the drainage hole. Drainage etc. can be easily separated from ice.

Moreover, like the above-mentioned embodiment, you may operate the conveyance part 4 continuously, You may control the conveyance part 4 based on the temperature of the waste_water | drain etc. which flow out from the heat exchange part 12, especially, It is not limited.
Specifically, the transport unit 4 is operated under conditions where the temperature of the drainage or the like generates ice rapidly (for example, the degree of supercooling is 1 ° C. or more), and the transport unit 4 is stopped under other conditions. Control may be performed.
By performing such control, useless movement of the transport unit 4 can be suppressed, and the cost required to obtain recovered water can be reduced. Further, if the transport unit 4 is operated when the amount of ice generated is small, the ice melts during transport and the loss increases. Such loss can be reduced by performing the control as described above.

Further, a measuring unit that measures the weight of the ice generated between the transport unit 4 and the recovery unit 6 may be provided, and the brine temperature of the brine unit 13 may be controlled based on the weight of the generated ice.
Specifically, when the amount of ice produced is small, the brine temperature is lowered to increase the amount of ice produced, and when the amount of ice produced is large, the brine temperature is raised to reduce the amount of ice produced. Do.
By performing such control, it is possible to make it difficult for the supercooling release to occur at a place other than the supercooling release unit 10 while maintaining a constant ice generation amount. Furthermore, even if the concentration of the concentrated drainage circulated from the circulation tank 11 becomes high and the freezing point becomes low, the ice can be continuously generated at the same speed.

Further, the flow rate of brine supplied to the heat exchange unit 12 may be controlled based on the flow rate of concentrated waste water circulated from the circulation tank 11.
Specifically, when the flow rate of the concentrated wastewater to be circulated decreases, the circulation flow rate of the brine in the brine unit 13 is increased at once, and when the flow rate of the concentrated wastewater to be circulated is recovered, the brine unit 13 supplies the heat exchange unit 12 Return the brine flow to be restored.
By performing such control, even if the flow rate of the concentrated waste water that is circulated as ice is generated in the heat exchange unit 12 decreases, the amount of brine supplied is reduced, so that the ice in the heat exchange unit 12 is reduced. Can be melted.

In addition, an electrical conductivity meter (EC meter) may be provided in the recovery unit 6 to control the flow rate of one or both of drainage and recovered water applied to the ice from the sprinkling unit 5 based on the electrical conductivity of the recovered water. There is no particular limitation. Specifically, when the electrical conductivity of the recovered water increases, the flow rate of one or both of drainage and recovered water applied to ice is increased, the removal rate of concentrated wastewater adhering to ice is increased, and the salt contained in the recovered water is increased. Reduce the rate.
Or you may lengthen the conveyance time of the ice by the conveyance part 4, raise the removal rate of the concentrated waste_water | drain adhering to ice, and may reduce the ratio of the salt contained in collection | recovery water.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the wastewater treatment apparatus of this embodiment is the same as that of the first embodiment, but the configuration around the transport unit is different from that of the first embodiment. Therefore, in the present embodiment, only the peripheral configuration of the transport unit will be described using FIGS. 4 to 6, and description of other components and the like will be omitted.
FIG. 4 is a schematic diagram illustrating the peripheral configuration of the transport unit in the wastewater treatment apparatus of the present embodiment.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 4, a dewatering unit 102 is provided between the transport unit 4 and the collection unit 6 of the waste water treatment apparatus 101.
The dewatering unit 102 removes the adhering water adhering to the ice conveyed by the conveying unit 4 from the ice. In the dehydrating part 102, a belt part 103 provided with a water absorbing member such as a sponge, a pair of roller parts 104 around which the belt part 103 is wound, a dewatering drum 105 that squeezes waste water sucked out by the water absorbing member, Is provided.

FIG. 5 is a partially enlarged view illustrating the configuration of the dewatering drum of FIG.
The roller unit 104 is disposed substantially horizontally apart between the transport unit 4 and the ice recovery tank 26, and the belt unit 103 is wound around the roller unit 104. The dewatering drum 105 is disposed on the lower belt portion 103 among the belt portions 103 wound around the roller portion 104. As shown in FIG. 5, the dewatering drum 105 is composed of a pair of rollers, and is disposed so as to squeeze the water absorbing member of the belt portion 103 by passing the belt portion 103 between the pair of rollers.

Next, a method for recovering recovered water from wastewater by the wastewater treatment apparatus 101 having the above-described configuration will be described.
Since the wastewater is supplied to the raw water tank 2 and the ice generated in the supercooling release unit 10 is transported by the transport unit 4, it is the same as that of the first embodiment, and thus the description thereof is omitted.

  The ice transported to the transport unit 4 falls from the transport unit 4 onto the belt unit 103 of the dewatering unit 102. The belt unit 103 conveys ice to the ice collection tank 26 side, and absorbs adhering water of ice by a water absorbing member. The ice from which the adhering water has been removed by the water absorbing member falls into the ice collection tank 26.

The water absorbing member that has absorbed the adhering water is sandwiched between the dewatering drums 105 so that the adsorbing adsorbed water is squeezed out. The squeezed adhering water is collected in the circulation tank 11.
Since the operation after dropping the ice into the ice collection tank 26 is the same as that of the first embodiment, the description thereof is omitted.

  According to said structure, since the dewatering part 102 removes the adhering water containing drainage from ice, only the ice can be supplied to the collection | recovery part 6, and the water quality of collection | recovery water can be aimed at.

FIG. 6 is a schematic view for explaining another embodiment of the dewatering drum of FIG.
As in the above-described embodiment, the dewatering drum 105 may be composed of a pair of rollers, or, as shown in FIG. 6, a single roller is disposed at a position facing the roller portion 104 and the dewatering drum 105A. There is no particular limitation.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the wastewater treatment apparatus of this embodiment is the same as that of the first embodiment, but the configuration around the transport unit is different from that of the first embodiment. Therefore, in the present embodiment, only the peripheral configuration of the transport unit will be described with reference to FIGS. 7 and 8, and description of other components and the like will be omitted.
FIG. 7 is a schematic diagram for explaining the peripheral configuration of the transport unit in the wastewater treatment apparatus of the present embodiment.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 7, a dewatering unit 202 is provided on the transport unit 204 of the wastewater treatment device (freezing type wastewater treatment device) 201.
Compared with the transport unit 4 of the first embodiment, the transport unit 204 is provided with a longer horizontal portion 23, and a watering unit 5 and a dewatering unit 202 are provided on the horizontal unit 23.

  The dehydrating unit 202 removes adhering water adhering to the ice conveyed by the conveying unit 4 from the ice. The dehydrating unit 202 is provided with a water absorbing unit 203 that absorbs adhering water, a cylindrical drum unit 206, and a dewatering drum 205 that squeezes the adhering water absorbed from the water absorbing unit 203.

FIG. 8 is a partially enlarged view illustrating the configuration of the dehydrating unit in FIG.
As shown in FIG. 8, the water absorption part 203 is disposed on the circumferential surface of the drum part 206, and is formed of a water absorption material such as a sponge that is pressed against the ice conveyed by the conveyance part 204 and absorbs water adhering to the ice. Is.
The dewatering drum 205 squeezes the water absorption part 203 between the drum part 206 and squeezes the adhering water sucked up by the water absorption part 203. The dewatering drum 205 is disposed closer to the water sprinkling unit 5 than the region where the water absorbing unit 203 is in contact with ice.

Next, a method for recovering recovered water from wastewater by the wastewater treatment apparatus 201 having the above-described configuration will be described.
Since the wastewater is supplied to the raw water tank 2 and ice is generated in the supercooling release unit 10, it is the same as that in the first embodiment, and thus the description thereof is omitted.

  As shown in FIG. 7, the ice in the circulation tank 11 is scooped up by the transport unit 204. The scooped-up ice is drained from the sprinkler 5 disposed above in the horizontal portion 23, and the concentrated drainage adhering to the ice is washed away. Thereafter, the adhering water is removed from the ice by the dewatering unit 202.

The water absorbing part 203 of the dewatering part 202 is pressed against the ice by the drum part 206 and sucks the adhering water adhering to the ice. The ice from which the adhering water has been absorbed falls from the horizontal portion 23 to the ice collection tank 26.
As shown in FIG. 8, the water absorbing section 203 that has sucked the adhering water passes between the dehydrating drum 205 and the drum section 206, and the sucked adhering water is squeezed out. The squeezed adhering water is collected in the circulation tank 11.
Since the operation after dropping the ice into the ice collection tank 26 is the same as that of the first embodiment, the description thereof is omitted.

  According to said structure, since the dewatering part 202 removes the adhering water containing waste water from ice, only the ice can be supplied to the collection | recovery part 6, and the water quality of collection | recovery water can be aimed at.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the wastewater treatment apparatus of this embodiment is the same as that of the first embodiment, but the configuration around the transport unit is different from that of the first embodiment. Therefore, in the present embodiment, only the peripheral configuration of the transport unit will be described with reference to FIG. 9, and description of other components and the like will be omitted.
FIG. 9 is a schematic diagram for explaining the peripheral configuration of the transport unit in the wastewater treatment apparatus of the present embodiment.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 9, the reverse conveyance part 304 which conveys ice, and the adhering water adhering to ice are wash | cleaned between the conveyance part 4 and the collection | recovery part 6 of the waste water treatment apparatus (freezing type waste water treatment apparatus) 301. And a cleaning unit 305 to be provided.
The reverse conveying unit 304 is provided with a receiving unit 306 that extends in a substantially horizontal direction and receives ice that has dropped from the conveying unit 4, and a cleaning unit 305 is disposed above the receiving unit 306. As the reverse conveyance unit 304, a belt conveyor or the like can be used similarly to the conveyance unit 4.

Waste water sent from the raw water pump 8 is supplied to the cleaning unit 305.
A receiving tank 307 is disposed below the cleaning unit 305 to receive the waste water from which the ice has been cleaned. Drainage collected in the receiving tank 307 is supplied to the sprinkler 5.

Next, a method for recovering recovered water from wastewater by the wastewater treatment apparatus 301 having the above-described configuration will be described.
Since the wastewater is supplied to the raw water tank 2 and ice is generated in the supercooling release unit 10, it is the same as that in the first embodiment, and thus the description thereof is omitted.

  The ice in the circulation tank 11 is scooped up by the transport unit 4 as shown in FIG. The drained ice supplied from the receiving tank 307 is applied to the scooped ice at the horizontal portion 23, and the concentrated waste water adhering to the ice is washed away. Thereafter, the ice falls from the transport unit 4 onto the receiving unit 306 of the reverse transport unit 304.

When the ice falls on the receiving portion 306, the top and bottom are inverted, and the lower portion of the transport portion 4 becomes the upper side. The ice that has been turned upside down is transported by the reversal transport unit 304, and one or both of drainage and recovered water are applied from the cleaning unit 305. The adhering water adhering to the ice is washed away by one or both of the waste water and the recovered water, and falls into the receiving tank 307 together with one or both of the waste water and the recovered water.
The ice from which the adhering water has been washed off is dropped into the ice recovery tank 26 after the adhering water has been drained while being conveyed to the reverse conveying unit 304.

  According to said structure, one or both of waste_water | drain and recovery water can be poured on ice from the direction different from the direction where the waste_water | drain was poured by the watering part 5. FIG. For this reason, it is possible to more reliably wash away the adhering water adhering to the ice.

In addition, like the above-mentioned embodiment, waste_water | drain may be supplied to the washing | cleaning part 305, and the collection | recovery water obtained by the collection | recovery part 6 may be supplied, and it does not specifically limit.
By supplying the recovered water to the cleaning unit 305 in this way, it is possible to more reliably wash away wastewater and concentrated wastewater adhering to ice, and improve the quality of recovered water. Further, by supplying the water collected in the receiving tank 307 to the sprinkling unit 5, the amount of the collected water used for washing away the adhering water adhering to the ice can be reduced.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the wastewater treatment apparatus of this embodiment is the same as that of the first embodiment, but the configuration around the transport unit is different from that of the first embodiment. Therefore, in the present embodiment, only the peripheral configuration of the transport unit will be described with reference to FIGS. 10 to 12, and description of other components and the like will be omitted.
FIG. 10 is a schematic diagram for explaining the peripheral configuration of the transport unit in the wastewater treatment apparatus of the present embodiment.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 10, the transport unit 404 of the wastewater treatment device (freezing type wastewater treatment device) 401 is provided with a standing plate 405, and a horizontal portion 406 extending substantially horizontally below the surface of the concentrated wastewater in the circulation tank 11. And an inclined portion 407 extending obliquely upward.
The standing plate 405 is a plate material provided so as to protrude with respect to the belt of the transport unit 404, and prevents ice from sliding off from the transport unit 404.

Next, a method for recovering recovered water from wastewater by the wastewater treatment apparatus 401 having the above configuration will be described.
Since the wastewater is supplied to the raw water tank 2 and ice is generated in the supercooling release unit 10, it is the same as that in the first embodiment, and thus the description thereof is omitted.

  As shown in FIG. 10, the ice in the circulation tank 11 is scraped up by the standing plate 405 of the horizontal portion 406 and scooped up from the concentrated drainage at the inclined portion 407. The scooped-up ice is washed away by the water sprinkling unit 5 and falls to the ice collection tank 26.

  According to the above configuration, by driving the transport unit 404, the ice floating on the concentrated drainage on the horizontal unit 406 is collected on the inclined unit 407, and the ice is placed on the inclined unit 407 and taken out from the concentrated drainage to collect ice. It can be transferred to the tank 26. Compared with the case where the horizontal portion 406 is not provided, since ice can be collected on the inclined portion 407, a large amount of ice can be placed on the inclined portion 407.

FIG. 11 is a partially enlarged view for explaining another embodiment of the standing plate of FIG. FIG. 12 is a schematic diagram illustrating the flow direction of drainage and the like on the standing plate of FIG.
In addition, the standing board 405 may be comprised from the board | plate material like the above-mentioned embodiment, and may be comprised in comb-tooth shape as shown in FIG. 11, It does not specifically limit.
With this configuration, the concentrated drainage or the like attached to the ice can flow not only from the drain hole 24 but also from the gap between the standing plates 405A as shown in FIG. The removal efficiency of etc. improves.

Note that the gap between the standing plates 405A is desirably a width that prevents ice from passing through, for example, a gap of about 5 mm.
Further, as described above, the standing plate 405 is not limited to the one configured in a comb-teeth shape, and may be configured to transmit water, for example, a mesh shape, and is not particularly limited.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the wastewater treatment apparatus of this embodiment is the same as that of the fifth embodiment, but the configuration around the transport unit is different from that of the fifth embodiment. Therefore, in the present embodiment, only the peripheral configuration of the transport unit will be described using FIG. 13, and description of other components and the like will be omitted.
FIG. 13 is a schematic diagram for explaining the peripheral configuration of the transport unit in the wastewater treatment apparatus of the present embodiment.
In addition, about the component same as 5th Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

A rotation unit 502 is provided between the transport unit 404 and the ice recovery tank 26 of the wastewater treatment device (freezing type wastewater treatment device) 501.
The rotation unit 502 holds the ice transported by the transport unit 404 for a predetermined time and drains it, and then drops the ice to the ice recovery tank 26.
The rotating portion 502 is provided with a support base 503 on which ice is placed, a support portion 504 that is rotatably supported, and a weight 505 for balancing.

The support base 503 is provided with a mounting surface 506 that supports ice and allows water to permeate, and a tray 507 that guides the permeated water to the circulation tank 11. A support portion 504 is connected to the lower surface of the tray 507.
The support portion 504 has one end connected to the support base 503 and the other end connected to the weight 505. Furthermore, a rotation shaft 508 that supports the support portion 504 so as to be rotatable is provided at a substantially center of the support portion 504.
The weight 505 is adjusted so that the weight of the support base 503 rotates toward the ice collection tank 26 when a predetermined amount of ice is placed on the support base 503.

Next, a method for recovering recovered water from wastewater by the wastewater treatment apparatus 501 having the above-described configuration will be described.
Since the drainage is supplied to the raw water tank 2 and the ice is transported by the transporting unit 404, it is the same as that of the fifth embodiment, and the description thereof is omitted.

The ice transported by the transport unit 404 falls from the transport unit 404 onto the support unit 504. When the ice falls on the support unit 504, the top and bottom are inverted, and the adhering water that could not be removed by the transport unit 404 is removed.
The adhering water removed from the ice passes through the placement surface 506 and is collected in the circulation tank 11 by the tray 507.

  When a predetermined amount of ice is placed on the support portion 504, the support portion 504 rotates downward about the rotation shaft 508. When the support portion 504 rotates downward, the ice slides down from the support portion 504 and falls into the ice collection tank 26.

  According to said structure, the removal rate of the adhering water adhering to ice improves, and the quality of recovered water can be improved. Furthermore, since less power is required as compared with a method having two transport units, the cost required to obtain recovered water can be reduced.

[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described with reference to FIG.
The basic configuration of the waste water treatment apparatus of the present embodiment is the same as that of the fifth embodiment, but the configuration around the ice generating unit is different from that of the fifth embodiment. Therefore, in the present embodiment, only the peripheral configuration of the ice generating unit will be described with reference to FIG. 14, and description of other components will be omitted.
FIG. 14 is a schematic diagram for explaining the peripheral configuration of the transport unit in the wastewater treatment apparatus of the present embodiment.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 14, the wastewater treatment apparatus (freezing-type wastewater treatment apparatus) 601 is provided with a drainage tank 602 supplied with wastewater, and an ice generation unit 603 that generates ice and concentrated wastewater from the wastewater. .

  The drainage tank 602 is a tank to which drainage discharged from an urban area is supplied, and ice is generated inside by an ice making drum 604.

  The ice generating unit 603 includes an ice making drum 604 that generates ice, a rotation driving unit 605 that rotates the ice making drum 604, a cooling unit 606 that cools the ice making drum 604, and a scraper (striping unit) that scrapes the ice from the ice making drum. 607).

The ice making drum 604 is a cylindrical member, and is arranged so that a central axis is arranged substantially parallel to the water surface of the drainage and a part of the circumferential surface is in contact with the drainage. Further, the ice making drum 604 is supported by the rotation driving unit 605 so as to be rotatable around the central axis.
The scraper 607 is disposed so that one end thereof is in contact with the circumferential surface, and the other end is disposed so as to guide ice to the transport unit 4.

Next, a method for recovering recovered water from wastewater by the wastewater treatment apparatus 601 having the above-described configuration will be described.
The drainage discharged from the urban area is supplied to the drainage tank 602, and the ice generation unit 603 generates ice from the drainage.

  Specifically, the ice making drum 604 is cooled by the cooling unit 606 and rotated by the rotation driving unit 605. Then, ice is generated on the circumferential surface of the ice making drum 604. The ice adhering to the circumferential surface of the ice making drum 604 rotates with the ice making drum 604 and is scraped off from the ice making drum 604 by the scraper 607. The scraped ice is pushed out on the scraper 607 toward the transport unit 4 and falls onto the transport unit 4.

  One or both of drainage and recovered water is poured from the sprinkling unit 5 to the ice that has fallen on the transport unit 4, and the concentrated drainage adhering to the ice is washed away. The ice from which the concentrated drainage has been washed away is drained of the adhering water while being transported by the transport unit 4 for a while. The drained ice falls from the transport unit 4 to the ice recovery tank 26.

  According to the above configuration, the ice formed on the cylindrical surface of the ice making drum 604 is peeled off by the scraper 607 and conveyed to the ice collection tank 26 by the conveying unit 4. Therefore, compared with a method of generating ice by releasing the supercooled state after the wastewater is brought into a supercooled state, the wastewater is less likely to be included in the ice, and the quality of the recovered water is easily improved.

  As in the above-described embodiment, ice may be directly transferred to the ice collection tank 26 by the transfer unit 4, the dehydration unit 102 of the second embodiment, the dehydration unit 202 of the third embodiment, or the like. The quality of the recovered water may be improved by combining the above, and is not particularly limited.

It is a schematic diagram explaining the structure of the waste water treatment apparatus which concerns on the 1st Embodiment of this invention. It is a schematic diagram explaining a part of structure of the cooling part in FIG. FIG. 2 is a partially enlarged view illustrating a configuration of a conveyance unit in FIG. 1. It is a schematic diagram explaining the periphery structure of the conveyance part in the waste water treatment equipment of the 2nd Embodiment of this invention. It is the elements on larger scale explaining the structure of the dehydration drum of FIG. It is a schematic diagram explaining the other Example of the dehydration drum of FIG. It is a schematic diagram explaining the periphery structure of the conveyance part in the waste water treatment equipment of the 3rd Embodiment of this invention. It is the elements on larger scale explaining the structure of the dehydration part of FIG. It is a schematic diagram explaining the periphery structure of the conveyance part in the waste water treatment equipment of the 4th Embodiment of this invention. It is a schematic diagram explaining the periphery structure of the conveyance part in the waste water treatment equipment of the 5th Embodiment of this invention. It is the elements on larger scale explaining other embodiment in the standing board of FIG. It is a schematic diagram explaining the flow direction of the waste_water | drain etc. in the standing board of FIG. It is a schematic diagram explaining the periphery structure of the conveyance part in the waste water treatment equipment of the 6th Embodiment of this invention. It is a schematic diagram explaining the periphery structure of the conveyance part in the waste water treatment equipment of the 7th Embodiment of this invention.

Explanation of symbols

1,101,201,301,401,501,601 Wastewater treatment equipment (freezing wastewater treatment equipment)
3,603 Ice generation unit 4,204,404 Conveying unit 5 Sprinkling unit 6 Recovery unit 9 Cooling unit 10 Supercooling release unit 11 Circulation tank (ice storage tank)
24 Drainage holes 102, 202 Dewatering unit 304 Reverse conveying unit 602 Drainage tank 604 Ice making drum 607 Scraper (stripping unit)

Claims (7)

An ice generator that generates ice and concentrated waste water from the waste water;
A transport unit for transporting the ice from the ice generating unit;
A recovery unit for melting the transported ice and generating recovered water;
A watering part that applies one or both of the drainage and the recovered water to the ice transported to the transporting part,
A reversing transport unit that transports the ice transported by the transport unit to the recovery unit and reverses the top and bottom of the ice when receiving the ice from the transport unit;
A washing unit that applies one or both of the waste water and the recovered water to the ice conveyed to the reversing conveyance unit;
Is provided with a freeze-concentration type wastewater treatment apparatus.   The freeze-concentration type wastewater treatment apparatus according to claim 1, wherein one or both of the waste water and the recovered water applied to the ice from the water sprinkling unit are supplied to the ice generation unit.   The drainage hole into which one or both of the said waste_water | drain drained from the said watering part and the said recovery water flows in is provided in the surface on which the said ice in the said conveyance part is mounted. The freeze concentration type waste water treatment apparatus as described. Before the ice enters the recovery unit,
The freeze-concentration type wastewater treatment apparatus according to any one of claims 1 to 3 , further comprising a dewatering unit that removes the water adhering to the ice. In the ice generator,
A cooling section for cooling the drainage to a supercooled state;
A supercooling release unit that releases the supercooled state of the wastewater to generate ice and concentrated wastewater;
An ice storage tank in which the ice and the concentrated drainage are stored;
The freeze-concentration type wastewater treatment apparatus according to any one of claims 1 to 4 , wherein The transport unit has at least a horizontal part extending substantially horizontally and an inclined part inclined.
The horizontal portion is disposed below the surface of the concentrated wastewater stored in the ice storage tank, and the inclined portion is disposed so as to extend from below the surface of the concentrated wastewater toward the outside of the ice storage tank. The freeze-concentration type wastewater treatment apparatus according to claim 5, In the ice generator,
A drainage tank in which drainage is stored;
An ice making drum in contact with the drainage and forming ice on a cylindrical surface while rotating;
Stripping off the ice from the cylindrical surface, a stripping unit for placing the stripped ice on the transport unit,
The freeze-concentration type wastewater treatment apparatus according to any one of claims 1 to 4 , wherein

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