JP3993609B2 - Freeze-concentration wastewater treatment equipment - Google Patents

Description

  The present invention relates to a freeze-concentrated wastewater treatment apparatus that can easily recover reusable water from non-clean water such as daily wastewater and various sewage.

  Water is the most important resource for animals and plants, and its importance is no different in any region. However, considering its ease of supply, it is no exaggeration to say that securing water is the most important issue, especially in areas where the amount of available water is extremely small, such as dry areas. In such an area, it is very difficult to secure a particularly large amount of irrigation water, and various attempts have been made to secure it.

  First, water is secured by pumping up groundwater. In this method of pumping up groundwater and using it as irrigation water, it is used for irrigation water, so the amount of water used is large, lowering the level of groundwater, and eventually leading to depletion of groundwater.

  As another method, a centralized sewage treatment plant is provided, and sewage is purified to obtain reused water, and an attempt is made to use this reused water as irrigation water. This method requires a large amount of cost just by constructing a centralized sewage treatment plant, and the operating cost of the reverse osmosis membrane treatment used to purify the sewage is high, so that the capital investment and operating cost can be covered. The enormous amount of money is required. On the other hand, if the sewage treatment is left unattended, various wastewaters will sag, causing water pollution and, consequently, environmental pollution.

  When considering economically securing various types of irrigation water in areas where water resources are scarce and sewage is not widespread as described above, it is not a large-scale centralized sewage treatment facility, but rather distributed, relatively small, reused water production I come up with the need for a device. As an apparatus that can be diverted to such a dispersion type relatively small reused water production apparatus, there can be mentioned a freeze-concentration type wastewater treatment apparatus developed for the purpose of reducing wastewater (Patent Document 1).

  The freeze-concentrated wastewater treatment device is a device that continuously generates sherbet-like ice (ice particles) using supercooled waste water and mechanically separates the generated ice particles. In this apparatus, as shown in FIG. 20, a stirring blade 1012 is provided in an ice making tank 1011, and waste water H is supplied through a pipe 1013. A supercooling release plate 1014 is disposed on the inner peripheral wall of the ice making tank 1011. The waste liquid H in the ice making tank 1011 is supercooled by the supercooling water production heat exchanger 1015 and then returned to the ice making tank 1011. At this time, the waste liquid H is sprayed toward the supercooling release plate 1014. When the supercooled wastewater H collides with the supercooling release plate 1014, ice I is instantaneously generated in a part thereof. The generated sherbet-like ice I and the supercooled waste water H as a liquid are stored in the ice making tank 1011. Therefore, in the ice making tank 1011, waste water H (mixed waste water of waste water supplied from the pipe 1013 and waste water returned after being cooled by the supercooling water production heat exchanger 1015) and ice I are mixed. Thus, the waste water H and ice I are stirred by the stirring blade 1012.

  The ice I in the ice making tank 1011 is supplied to the centrifuge 1016 together with the waste water H, and the waste water H and the ice I are mechanically separated by the centrifuge 1016. Ice I is a clear ice crystal and does not contain impurities. Therefore, by separating the ice I, the amount of water in the waste water H decreases, and the concentration of the waste water H increases accordingly.

  The waste liquid H separated by the centrifugal separator 1016 is supplied to the supercooled water production heat exchanger 1015 again. Since the wastewater H contains impurities, its freezing point is lower than 0 ° C. Therefore, the waste water H is cooled to about −0.5 to −2.0 ° C. by the supercooled water production heat exchanger 1015 and is brought into a supercooled state. The wastewater H thus supercooled collides with the supercooling release plate 1014 to release supercooling, and ice I is generated.

  The ice I separated by the centrifugal separator 1016 is supplied to the ice melting heat exchanger 1017 and is melted into the molten water W in the ice melting heat exchanger 1017. The dirt concentration of the molten water W is below the discharged water quality standard.

  Thus, the conventional freeze-concentrated wastewater treatment apparatus has a function of taking out only moisture from the wastewater H as ice I and discharging the ice I as melt water W. This freeze-concentrated wastewater treatment device is mainly intended to reduce the volume of wastewater that is treated as waste in wastewater treatment, continuously generating ice, and separating and removing the generated ice from wastewater, Concentrate wastewater H to reduce the volume of wastewater used as waste. In this freeze-concentrated wastewater treatment device, the volume of wastewater can be reduced to about 1/10 of the initial input amount, and the wastewater treatment cost can be reduced. In addition, the code | symbol 1018 in a figure shows the waste water circulation supply pipe | tube which supplies the waste water in the said ice making tank 1011 and the waste water isolate | separated by the said separator 1016 to the said supercooled water production heat exchanger 1015.

  By diverting the freeze-concentrated wastewater treatment device to a distributed and relatively small reused water production device, the amount of water available for irrigation water in areas where water resources are small and sewerage is insufficient is reduced. It is expected to be secured without contamination or destruction.

JP 2003-275748 A

  However, when the freeze-concentrated wastewater treatment apparatus is actually used as a reuse water production apparatus, it has been found that there are the following problems that must be solved.

(1) Ice particles generated by releasing the supercooling float in the wastewater in the ice making tank, and are then sent to the separator together with the wastewater to be separated from the sewage. When a conventional frozen wastewater treatment device is used mainly for obtaining a large amount of reused water, it is necessary to increase the efficiency of transporting ice particles to the separator, but the ice particles from the ice making tank to the centrifuge In other words, since the waste water is used as the carrier, in other words, since the waste water is accompanied, the transport amount of the ice particles cannot be increased.
(2) In the separator, waste water and ice particles are separated, but since the mixture of waste water and ice particles is input to the separator, the amount of ice particles in the total amount of input is limited. Therefore, it is difficult to increase the separation efficiency of ice particles.
(3) Supercooled water is easily iced by environmental temperature or external physical stimulation. Therefore, ice particles are obtained by making the supercooling water collide with a plate-like member called a supercooling release plate. However, the temperature of the supercooling water varies slightly depending on the composition of the wastewater used as the supercooling water, and the degree of icing varies accordingly. Ideally, the supercooling water that collided with the supercooling release plate flows down from the supercooling plate and at the same time forms ice particles and falls into the ice making tank. However, depending on the environmental temperature and fluctuations in the composition of the wastewater, even if the operating conditions are the same, the icing speed when colliding with the supercooling plate is fast and icing may occur on the supercooling plate. When icing starts on the supercooling plate, the icing layer easily grows with time, and if the growth continues, the supercooling water supply pipe located above the supercooling plate may be blocked. When the tip of the supercooling supply pipe freezes, the entire supply pipe is frozen. In that case, it is necessary to stop the operation of the apparatus, peel off the grown ice from the supercooling plate, and release the freezing of the supply pipe. If the attached ice on the cooling release plate is peeled before reaching that point, the device can be stopped for a long time, but the operation of the device must still be stopped during the removal of the attached ice on the cooling release plate. Absent.

  Thus, when using a conventional freeze-concentrated wastewater treatment device as a reuse water production device for obtaining a large amount of reused water, the amount of generated ice particles supplied to the separator is increased and recovered. It is necessary to improve the water recovery rate. Furthermore, in order to obtain a large amount of reused water, continuous operation of the apparatus is essential, so it is important to prevent freezing of the supercooling plate.

  The present invention has been made in view of the above-described conventional circumstances, and is a freeze-concentrated wastewater that can efficiently recover from the wastewater reused water that can be used as a large amount of water such as irrigation water and middle water. It is to provide a processing apparatus.

In order to solve the above-mentioned problem, a freeze-concentrated wastewater treatment apparatus according to claim [1] of the present invention includes an overcooling water production heat exchanger for supercooling wastewater, and an overcooling water production heat exchanger. A supercooling wastewater supply pipe for transporting the cooled supercooling wastewater, and a supercooling release means for releasing supercooling wastewater by receiving the supercooling wastewater flowing down from the supercooling supply pipe and generating ice particles And an ice making tank that is provided at a lower portion of the supercooling release means and into which wastewater from a wastewater source is injected, and an ice grain that is provided at the upper portion of the icemaking tank and is supplied from the supercooling release means from the wastewater. The skimming means for scooping, the separator that is supplied with the ice particles separated by the skimming means, and separating the waste water accompanying the ice particles from the ice particles, the waste water in the ice making tank, and the separator are separated by the separator. The waste water and the supercooled A frozen concentrated waste processing apparatus having a supplying waste water circulation supply pipe to the water producing heat exchangers, the ice making tank is a bottom length box-like, wall among the skimming means, facing each other of the ice making tank A drop chute provided to open above the surface of the waste water in the ice making tank, a scooping inclined surface member provided in front of each opening of the drop chute, and the drop chute facing each other Waste water surface sweeping member that reciprocates and pushes ice particles floating on the waste water surface along the inclined surface of each scooping inclined surface member toward the opening of each falling chute and dropping it into each falling chute It is comprised from these.

A freeze-concentrated wastewater treatment apparatus according to claim [2] of the present invention conveys supercooled water production heat exchanger for supercooling wastewater, and supercooled wastewater subcooled by the supercooled water production heat exchanger. A supercooling wastewater supply pipe, a supercooling release means for releasing supercooling wastewater by receiving the supercooling wastewater flowing down from the supercooling supply pipe, and generating ice particles; and An ice-making tank provided at a lower part and into which waste water from a waste-water source is injected; skimming means provided at an upper part of the ice-making tank; and skimming ice particles supplied from the supercooling release means; and the skimming The separator that is supplied with the ice particles separated by the means and separates the waste water accompanying the ice particles from the ice particles, the waste water in the ice making tank, and the waste water separated by the separator is the supercooled water. Manufacturing heat exchanger A wastewater circulation supply pipe for supplying the wastewater, wherein the skimming means is provided on the outer periphery of the drop chute that opens above the surface of the wastewater in the ice making tank, and the opening of the drop chute An enclosed wall member, a mesh member fixed horizontally so as to cover the entire waste water surface above the waste water surface directly below the enclosed wall member, and ice particles separated on the mesh member surface by the enclosed wall It is comprised from the waste-water surface sweeping member pushed in toward the opening part of the said fall chute along the enclosure wall surface of a member, and dropping in the said fall chute .

A freeze-concentrated wastewater treatment apparatus according to claim [3] of the present invention transports a supercooled water production heat exchanger that supercools wastewater, and supercooled wastewater that is supercooled by the supercooled water production heat exchanger. A supercooling wastewater supply pipe, a supercooling release means for releasing supercooling wastewater by receiving the supercooling wastewater flowing down from the supercooling supply pipe, and generating ice particles; and An ice-making tank provided at a lower part and into which waste water from a waste-water source is injected; skimming means provided at an upper part of the ice-making tank; and skimming ice particles supplied from the supercooling release means; and the skimming The separator that is supplied with the ice particles separated by the means and separates the waste water accompanying the ice particles from the ice particles, the waste water in the ice making tank, and the waste water separated by the separator is the supercooled water. Manufacturing heat exchanger A wastewater circulation supply pipe for supplying the wastewater, wherein the skimming means has a dropping chute that opens above the surface of the wastewater in the ice making tank, and the surface of the wastewater in the ice making tank. And a belt conveyor configured to convey the ice particles picked up on the mesh-shaped belt to the opening of the dropping chute and throw it into the opening. A belt press device for squeezing out the waste liquid accompanying the surface of the ice particles on the mesh-like belt is provided at least in part .

A freeze-concentrated wastewater treatment apparatus according to claim [4] of the present invention transports supercooled water production heat exchanger for supercooling wastewater, and supercooled wastewater subcooled by the supercooled water production heat exchanger. A supercooling wastewater supply pipe, a supercooling release means for releasing supercooling wastewater by receiving the supercooling wastewater flowing down from the supercooling supply pipe, and generating ice particles; and An ice-making tank provided at a lower part and into which waste water from a waste-water source is injected; skimming means provided at an upper part of the ice-making tank; and skimming ice particles supplied from the supercooling release means; and the skimming The separator that is supplied with the ice particles separated by the means and separates the waste water accompanying the ice particles from the ice particles, the waste water in the ice making tank, and the waste water separated by the separator is the supercooled water. Manufacturing heat exchanger A wastewater circulation supply pipe for supplying the wastewater, wherein the skimming means has a dropping chute that opens above the surface of the wastewater in the ice making tank, and the surface of the wastewater in the ice making tank. And a belt conveyor configured to convey the ice particles picked up on the mesh-shaped belt to the opening of the dropping chute and throw it into the opening. A vacuum suction device for sucking and removing the waste liquid accompanying the surface of the ice particles on the mesh-like belt is provided at least at a part thereof.

  The freeze-concentrated wastewater treatment apparatus according to the present invention has an effect that it is possible to efficiently recover reused water having a quality that can be used as irrigation water or middle water from sewage composed of domestic wastewater or the like.

  Below, the example of the freeze concentration wastewater treatment equipment concerning the present invention is described in detail based on a drawing. In addition, the Example shown below is only the illustration for demonstrating this invention suitably, and does not limit this invention at all.

  The unique configuration of the freeze-concentrated wastewater treatment apparatus of the present invention compared to the conventional freeze-concentrate wastewater treatment apparatus is a skimming means for scooping off the ice particles supplied from the supercooling release means at the top of the ice making tank. It is in the point provided and the movable mechanism of the supercooling release means provided in the upper part of the ice making tank, and other configurations may be common to the conventional apparatus. Therefore, in the figure explaining the following examples, only the main part of the ice making tank part is shown without showing the overall view of the freeze concentration wastewater treatment apparatus. Note that the supercooling release means in the present invention is not limited to the supercooling release plate formed in a plate shape, but receives ice from the supercooling wastewater, impacts the supercooling wastewater, and ice particles due to supercooling release. Any shape can be used as long as it can be generated. For example, a block having an impact surface that receives falling supercooled wastewater may be used. In this case, the impact surface is preferably an inclined surface. In the following embodiments, a case where a supercooling release plate is used as the supercooling release means will be described as an example.

[Reference Example 1 ]
1-3 is a figure which shows the reference example 1 of the freeze concentration wastewater processing apparatus concerning this invention. FIG. 1 is a plan view of a part of the apparatus, FIG. 2 is a side sectional view taken along line II-II in FIG. 1, and FIG.

  In the figure, reference numeral 1 denotes a bottomed cylindrical ice making tank. A supercooling release plate 2 is attached to the upper part of the ice making tank 1, and a supercooling (not shown) is further provided thereon. The supply pipe 3 of the supercooled wastewater supercooled by the water production heat exchanger is terminated.

  A drop chute 4 is provided in the ice making tank 1. The falling chute 4 communicates with a centrifuge (not shown), and the wall portion is formed liquid-tight so that the waste water H in the ice making tank 1 does not enter. If the height position of the opening 4a of the drop chute 4 with respect to the waste water level is too low, the amount of waste water accompanying the ice increases, which is inconvenient. On the other hand, if the height is too high, it is necessary to increase the scale of the scooping-up inclined surface member 5 and the later-described waste water surface sweeping member (scraping brush portion) 6, resulting in an increase in apparatus cost and inconvenience. From this point of view, although depending on the scale of the ice making tank, it is usually desirable that the opening 4a of the drop chute 4 is installed at a position 5 to 50 cm higher than the waste water level in the tank. The opening 4a of the drop chute 4 is desirably located in a region extending from a part of the inner wall of the ice making tank 1 to substantially the center of the tank. A scooping inclined surface member 5 is integrally attached to the upper outer periphery of the drop chute 4. The inclined surface 5a of the scooping inclined surface member 5 has the uppermost position at the same position as the opening surface of the drop chute 4 and is inclined so as to be submerged in the waste water H as the distance from the side surface of the drop chute 4 increases. .

  Further, in the ice making tank 1, a waste water surface sweeping member 6 that rotates to sweep the water surface of the waste water H in the tank is attached. The waste water surface sweeping member 6 basically has the same structure as a cleaning basket, and has a rotating shaft 6a located at the center of the ice making tank 1 and a perpendicular to the rotating shaft 6a, that is, in the tank. The main body 6b is fixed so as to be parallel to the waste water surface, and a large number of sweep hairs 6c are implanted so as to hang down from the main body 6b.

  In the above-described configuration, the drop chute 4, the scooping inclined surface member 5, and the waste water surface sweeping member 6 constitute skimming means 7, and this skimming means is the ice making tank 1 as described below. It has a mechanism for scooping up ice particles floating in the waste water H inside.

  As described above, when the supercooling wastewater flows down onto the supercooling release plate 2 from the supercooling wastewater supply pipe 3 and collides, a part of the wastewater becomes ice particles. The generated ice particles float on the surface of the waste water H in the ice making tank 1 as shown in FIG. In this state, when the waste water surface sweeping member 6 is rotated, the sweep hair 6c at the tip scoops up the ice particles floating on the waste water surface and scrapes them toward the inclined surface member 5. When the sweeping hair 6c reaches the inclined surface member 5, the ice particles are scooped up along the inclined surface 5a and dropped into the dropping shoe 4 from the opening 4a of the dropping chute 4.

  By the skimming operation, the ice particles are separated from the wastewater while being moved on the inclined surface 5a by the sweeping hair 6c, and accompanied by a small amount of wastewater that is attached to the surface, through the fall chute 4. Sent to a centrifuge (not shown). The ice particles sent to the centrifuge are subjected to centrifugal force, and the waste water adhering to the surface is shaken off, and the amount of waste water accompanying is further reduced. The recovered water obtained by melting the ice particles obtained in this way with a heat exchanger has been purified to such an extent that it can be used as irrigation water or middle water. The obtained melted water is sterilized and supplied as reused water to necessary facilities such as irrigation facilities and middle water facilities.

  When the freeze-concentrated wastewater treatment apparatus having the above-described configuration is applied, for example, to an area where the sewerage is not yet developed, the most inexpensive storage is a storage that can be sealed for each village by a simple groove or the like. It is conceivable to collect in a pond and guide from this reservoir to the ice making tank 1 using a pump with a filtration function. This wastewater introduction facility can have many more sanitary and efficient configurations as long as there is a surplus of funds that can be invested.

FIGS. 4-6 is a figure which shows Example 1 of the freeze concentration wastewater processing apparatus concerning this invention. FIG. 4 is a side sectional view of the device, FIG. 5 is a plan view of the device in partial cross section, and FIG.

  In the figure, reference numeral 11 denotes a bottomed box-shaped ice making tank. A supercooling release plate 12 is attached to the upper part of the ice making tank 11, and further, a supercooling release plate 12 (not shown) is further provided thereon. The supply pipe 13 of the supercooled wastewater supercooled by the cooling water production heat exchanger is terminated.

  In addition, drop chutes 14 and 14 are provided in the ice making tank 11. The drop chutes 14 and 14 communicate with a centrifuge (not shown), and the wall portion is formed liquid-tight so that the waste water H in the ice making tank 11 does not enter. Each opening 14a of the drop chute 14 is installed at a position 5 to 50 cm higher than the waste water level in the tank for the same reason as described in the first embodiment. Located on the wall. Scooping inclined surface members 15, 15 are integrally attached to the upper outer surfaces of the drop chutes 14, 14. The inclined surfaces 15 a of the scooping inclined surface members 15, 15 are located at the same position as the opening surface of the dropping chute 14, and are separated from the outer surface of the dropping chute 14 toward the center of the ice making tank 11. Inclined so as to be immersed in the wastewater H.

  Further, in the ice making tank 11, a waste water surface sweeping member 16 that repeats reciprocating movement is attached so as to sweep the water surface of the waste water H in the tank. The waste water surface sweeping member 16 basically has the same structure as a cleaning basket, and is a reciprocating drive shaft 16a attached movably along the longitudinal center line of the ice making tank 11, A main body portion 16b fixed perpendicularly to the reciprocating drive shaft 16a, that is, parallel to the waste water surface in the tank, and a number of sweep hairs 16c planted so as to hang from the main body portion 16b. It consists of and.

  In the above configuration, the drop chutes 14, 14, the scooping inclined surface members 15, 15, and the waste water surface sweeping member 16 constitute skimming means 17, which will be described below. The mechanism has a mechanism for scooping off the ice particles floating in the waste water H in the ice making tank 11.

  As described above, when the supercooling wastewater flows down on the supercooling release plate 12 from the supercooling wastewater supply pipe 13 and collides, a part of the wastewater becomes ice particles. The generated ice particles float on the surface of the waste water H in the ice making tank 11 as shown in FIG. In this state, when the waste water surface sweeping member 16 is moved horizontally, the sweep hair 16c at the tip scoops up the ice particles floating on the waste water surface and scrapes them toward the inclined surface member 15. When the sweep hair 16c reaches the inclined surface member 15, the ice particles are scooped up along the inclined surface 15a and dropped into the dropping shoe 14 from the opening 14a of the dropping chute 14.

  By the skimming operation, the ice particles are separated from the wastewater while being moved on the inclined surface 15a by the sweeping hairs 16c, and accompanied by a small amount of wastewater that is attached to the surface, through the fall chute 14. Sent to a centrifuge (not shown). The ice particles sent to the centrifuge are subjected to centrifugal force, and the waste water adhering to the surface is shaken off, and the amount of waste water accompanying is further reduced. The recovered water obtained by melting the ice particles obtained in this way with a heat exchanger has been purified to such an extent that it can be used as irrigation water or middle water. The obtained melted water is sterilized and supplied as reused water to necessary facilities such as irrigation facilities and middle water facilities.

FIGS. 7-11 is a figure which shows Example 2 of the freeze concentration wastewater processing apparatus concerning this invention. 7 is a side sectional view of the apparatus, and FIGS. 8 to 11 are plan views taken along line III-III in FIG.

  In the figure, reference numeral 21 denotes a bottomed cylindrical ice making tank. A supercooling release plate 22 is attached to the top of the ice making tank 21, and a supercooling (not shown) is further provided thereon. The supply pipe 23 of the supercooled wastewater supercooled by the water production heat exchanger is terminated.

  The ice making tank 21 is provided with a drop chute 24 so that a part of the wall of the tank protrudes outward. The drop chute 24 communicates with a centrifuge (not shown), and the wall portion is formed liquid tight so that the waste water H in the ice making tank 21 does not enter. The opening 24 a of the drop chute 24 is installed at a level considerably higher than the waste water level in the tank, for example, about 1 m, and is formed at a position protruding outward from the inner wall surface of the ice making tank 21.

  An enclosure wall member 25 is integrally attached to the side surface of the drop chute 24 on the tank side. The base end of the enclosure wall member 25 is fixed to one side of the opening 24 a of the drop chute 24. The side wall surface 25a of the enclosing wall member 25 is gently curved from the base end side to the terminal end side. The enclosing wall member 25 has a longitudinal direction parallel to the waste water surface. The position of the enclosing wall member 25 from the waste water surface is set at substantially the same position as the opening 24 a of the drop chute 24.

  A mesh member 26 is fixed immediately below the surrounding wall member 25 so as to horizontally cover the entire opening of the ice making tank 21. The mesh diameter of the mesh member 26 is set to be equal to or smaller than the diameter size of the smallest ice particle generated by the supercooling release plate 22. As described above, the mesh member 26 is provided immediately below the surrounding wall member 25, and is installed at a height of, for example, 1 m from the waste water surface. The reason why the height from the waste water surface is set to a relatively high value of about 1 m is as follows. That is, if the distance between the waste water surface and the mesh member 26 is too close, the waste water bounces off from the waste water surface when the waste water flows, and the waste water is scattered on the mesh. As a result, the amount of waste water accompanying the ice particles increases. Because it does. Moreover, if the waste water accompanying the ice can be removed as much as possible when the ice particles move to the drop chute 24 by the later-described sweeping member 27, the load on the solid-liquid separation system (centrifugal separator) can be reduced. In consideration of such an effect, the higher the height of the mesh member 26 from the waste water surface, the better. However, if the distance between the mesh member 26 and the waste water surface is increased, the size of the ice making tank is correspondingly increased. This increases the device cost. From this viewpoint, although it depends on the flow rate of the supercooling water, it is desirable to leave an interval of about 1 m.

  Further, a waste water surface sweeping member 27 that rotates so as to sweep the upper surface of the mesh member 26 is attached in the ice making tank 21. The waste water surface sweeping member 27 basically has the same structure as a cleaning basket, and includes a rotating shaft 27a that is rotatably attached to the center of the ice making tank 21, and a perpendicular to the rotating shaft 27a. That is, it is composed of a main body portion 27b fixed so as to be parallel to the waste water surface in the tank and a large number of sweep hairs 27c planted so as to hang down on the main body portion 27b.

  In the above-described configuration, the dropping chute 24, the surrounding wall member 25, and the waste water surface sweeping member 27 constitute skimming means 28, and this skimming means is provided in the ice making tank 21 as described below. It has a mechanism for scooping up ice particles floating in the waste water H.

  As described above, when the supercooling wastewater flows down from the supercooling wastewater supply pipe 23 onto the supercooling release plate 22 and collides, a part of the wastewater becomes ice particles. The generated ice particles are scooped on the upper surface of the mesh member 26 in the ice making tank 21 as shown in FIGS. 9 to 11 (the mesh member 26 is not shown in these drawings). When the waste water surface sweeping member 26 is rotated in this state, as shown in FIG. 9, the sweeping hair 27 c at the tip of the waste water surface encloses the ice particles scooped up on the upper surface of the mesh member 26 toward the wall member 25. Rake up. When the sweeping hairs 27c reach the enclosing wall member 25, as shown in FIG. 10, the ice particles are enclosed along the curved side wall surface 25a of the enclosing wall member 25, and as shown in FIG. Drop into the drop shoe 24 from the portion 24a. During this series of ice particle enclosing operations, the ice particles are held by the mesh member 26, and excess waste water adhering to the surface of each ice particle is screened under the mesh. In this way, the ice particles on the mesh member 26 are separated from the waste water by the operation of enclosing the ice particles by the waste water surface sweeping member 27 and the enclosing wall member 25 while the surface waste water is being screened off, and the falling chute is surely made. 24.

  By the skimming operation, the ice particles are moved on the mesh member 26 by the sweeping hairs 27c along the side wall surface 25a of the wall member 25 and dropped onto the drop chute 24, but dropped as described above. It is only ice particles, and no wastewater flows into it. Therefore, the amount of waste water that enters the fall chute 24 is small enough to adhere to the surface of the ice particles, and the load of solid-liquid separation in the centrifuge can be reduced. The ice particles sent to the centrifuge are subjected to centrifugal force, and the waste water adhering to the surface is shaken off, and the amount of waste water accompanying is further reduced. The recovered water obtained by melting the ice particles obtained in this way with a heat exchanger has been purified to such an extent that it can be used as irrigation water or middle water. The obtained melted water is sterilized and supplied as reused water to necessary facilities such as irrigation facilities and middle water facilities.

  As described above, in the present embodiment, the falling ice particles can be picked up by the mesh member 26 and separated from the waste water, so that the recovery rate of the ice particles is improved. Further, the ice particles caught on the upper surface of the mesh member 26 are excessively attached to the surface of the mesh member 26 by rolling on the mesh by the sweeping hairs 27c of the sweeping member 27 that sweeps on the mesh. The waste water that is present is screened under the mesh, and the amount of waste water that accompanies the drop chute 24 is greatly reduced. As a result, the load on the subsequent centrifuge can be reduced.

  12 and 13 are diagrams showing a fourth embodiment of the freeze-concentrated wastewater treatment apparatus according to the present invention. FIG. 12 is a side sectional view of the ice making tank portion of the apparatus, and FIG. 13 is a configuration diagram of a main part for explaining the operation of the skimming means of this embodiment.

  In the figure, reference numeral 31 denotes an ice making tank having a bottomed long box shape. A supercooling release plate 32 is attached to the top of the ice making tank 31, and further, a supercooling release plate 32 (not shown) is further provided thereon. A supply pipe 33 of supercooled wastewater supercooled by the cooling water production heat exchanger is terminated.

  The ice making tank 31 is provided with a drop chute 34 along one inner wall portion of the tank. The dropping chute 34 communicates with a centrifuge (not shown), and the wall portion is formed liquid-tight so that the waste water H in the ice making tank 31 does not enter. The opening 34a of the drop chute 34 is formed at a position higher than the waste water level in the tank by 10 cm or more.

  A belt conveyor 36 having a mesh-like belt 35 is provided so as to cover almost the entire surface of the waste water in the ice making tank 31. The mesh diameter of the mesh belt 35 is set to be equal to or smaller than the diameter size of the smallest ice particles generated by the supercooling release plate 22. The belt conveyor 36 rotates the mesh belt 35, scoops the ice particles falling on the belt 35, conveys them to the opening 34a of the drop chute 34, and drops the ice particles on the drop chute 34. To do.

  Further, a belt press device 37 is provided near the dropping chute 34 of the belt conveyor 36 to squeeze the waste liquid accompanying the surface of the ice particles scooped up on the mesh belt 35. Further, the opening 34 a of the drop chute 34 is provided with a belt conveyor 36 and projecting members 38 a and 38 b for peeling off ice particles adhering to each belt of the belt press device 37. The protruding member 38a is integrated with a wall portion forming the opening 34a.

  In the above configuration, the belt press device 37 is not essential, and is an optional device that is effective for reducing the amount of waste water accompanying the ice particles dropped on the falling chute. Further, in the above-described configuration, the dropping chute 34 and the belt conveyor 36 constitute skimming means 39, and this skimming means collects ice particles falling together with waste water in the ice making tank 31, as will be described below. It has a scooping mechanism.

  As described above, when the supercooling wastewater flows down onto the supercooling release plate 32 from the supercooling wastewater supply pipe 33 and collides, a part of the wastewater becomes ice particles. As shown in FIG. 13, the generated ice particles are scooped by the mesh belt 35 of the belt conveyor 36 while falling into the waste water H in the ice making tank 31. The ice particles picked up on the mesh belt 35 are conveyed toward the dropping chute 34 as the belt 35 rotates, and are attached to the ice particle surface by the belt press device 37 along the way. Waste water is squeezed out. Ice particles whose amount of entrained waste water adhering to the surface by the belt press device 37 is greatly reduced are dropped into the drop shoe 34 from the opening 34a of the drop chute 34.

  Due to the skimming operation, the ice particles are moved by sieving the waste water by the belt conveyor 36 and dropped onto the drop chute 34, but only the ice particles are dropped, and the waste water does not flow in. Therefore, the waste water that enters the fall chute 34 is a small amount that is attached to the surface of the ice particles. The attached waste water is further reduced by providing the belt press device 37. The ice particles sent to the centrifuge via the drop chute 34 receive a centrifugal force, shake down the waste water adhering to the surface, and the amount of waste water accompanying is further reduced. The recovered water obtained by melting the ice particles obtained in this way with a heat exchanger has been purified to such an extent that it can be used as irrigation water or middle water. The obtained melted water is sterilized and supplied as reused water to necessary facilities such as irrigation facilities and middle water facilities.

FIGS. 14-17 is a figure which shows Example 4 of the freeze concentration wastewater processing apparatus concerning this invention. The feature of this embodiment consists in using a vacuum suction device 40 in place of the belt press apparatus 37 in the third embodiment, other configurations are the same as those in Example 3. The vacuum suction device 40 exerts an action of sucking and removing the waste liquid accompanying the surface of the ice particles on the mesh belt 35. The decompression suction device 40 is a device in which the upper portion of the decompression chamber 42 that is decompressed by the suction pump 41 is expanded, and the upper end opening surface 43 is formed in a mesh shape.

  In the apparatus having the above-described configuration, as shown in FIG. 15, the ice particles are scooped up by the mesh belt 35 of the belt conveyor 36 and move toward the dropping chute 34 while sieving waste water as the belt 35 rotates. Is done. As shown in FIG. 16, the ice particles are sucked off the waste water adhering to the surface by the vacuum suction device 40 provided in the vicinity of the drop chute 34, and the amount of waste water accompanying the surface is further reduced. Is done. The ice particles whose amount of waste water adhering to the surface in this way has been greatly reduced are dropped onto the dropping chute 34 by the belt conveyor 36. The ice particles sent to the centrifuge via the drop chute 34 receive a centrifugal force, shake down the waste water adhering to the surface, and the amount of waste water accompanying is further reduced. The recovered water obtained by melting the ice particles obtained in this way with a heat exchanger has been purified to such an extent that it can be used as irrigation water or middle water. The obtained melted water is sterilized and supplied as reused water to necessary facilities such as irrigation facilities and middle water facilities.

[ Reference Example 2 ]
FIG. 18 is a diagram showing Reference Example 2 of the freeze-concentrated wastewater treatment apparatus according to the present invention. The feature of the reference example 2 is that the supercooling water release plate is improved in order to enable ice making continuously for a long time. As shown in the figure, the supercooling release plate 50 has a structure that is rotatably fixed to a mounting plate 51 fixed to the inner wall of the ice making tank by a thumbscrew 52. The mounting plate 51 is preferably provided with an angle scale so that the inclination angle of the supercooling release plate 50 can be confirmed.

  As described above, the composition of wastewater to be treated may vary greatly depending on the region and time zone. When the composition of the wastewater is changed, the supercooling state of the wastewater is also changed, and the supercooling release temperature and the surface state of the ice particles generated after the supercooling release are also changed. In some cases, ice particles tend to adhere to the plate 50. Once the ice particles adhere to the surface of the supercooling release plate 50, they are stacked one after another and an ice layer grows. In this state, ice particles can no longer be generated, and if left untreated, the supercooling water supply pipe located on the supercooling release plate 50 is closed. In such a case, the tilt angle of the subcooling release plate 50 is set by loosening the thumbscrew 51 and tilting the tilt angle of the supercooling release plate 50 in a more vertical direction and fixing the butterfly screw 51 again. To make it more steep. As a result, ice particles are less likely to adhere to the surface of the supercooling release plate 50, and a situation where the operation of the apparatus is stopped can be avoided.

[ Reference Example 3 ]
FIG. 19 is a diagram showing Reference Example 3 of the freeze-concentrated wastewater treatment apparatus according to the present invention. The feature of this reference example 3 is that the supercooling water release plate is improved in order to enable ice making continuously for a long time. As shown in the figure, the supercooling release plate 60 is rotatably fixed by a motor 62 fixed to a mounting plate 61 fixed to the inner wall of the ice making tank. A mounting plate 63 is fixed to the inner wall of the ice making tank below the mounting plate 61, and a locking member 64 extending toward the supercooling release plate 60 is fixed to the mounting plate 63. ing.

  According to the said structure, the inclination angle of the supercooling cancellation | release board 60 can be suitably adjusted with the motor 62 similarly to the said Example 6. FIG. Further, in this embodiment, as described above, it is possible to cope with the case where ice particles begin to adhere to the surface of the supercooling release plate 60. When it is confirmed that ice particles have started to adhere to the surface of the supercooling release plate 60, the motor 62 is driven to rotate the supercooling release plate 60 with a large rotation angle. By rotating it largely, the supercooling release plate hits the locking member 64, and by the impact, ice particles or a laminated ice layer adhering to the surface can be shaken off. This shaking off operation can surely avoid the situation where the operation of the apparatus must be stopped and the ice must be peeled off from the surface of the supercooling release plate 60.

  As described above, the freeze-concentrated wastewater treatment apparatus according to the present invention can efficiently and economically recover water with good water quality from wastewater without constructing a large-scale facility. It can be used as a small-to-medium-scale wastewater purification device in areas where there is a shortage of intermediate water or where sewage is not complete, and there are problems with sewage treatment and water used in large quantities such as irrigation water and intermediate water. Can be solved at the same time, contributing to environmental conservation and environmental improvement.

BRIEF DESCRIPTION OF THE DRAWINGS It is the top view block diagram of the ice making tank which shows the reference example 1 of the freeze concentration wastewater processing apparatus concerning this invention, and is the principal part of an apparatus. It is a side cross-section block diagram which follows the II-II line | wire of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. BRIEF DESCRIPTION OF THE DRAWINGS It is Example 1 of the freeze concentration wastewater processing apparatus concerning this invention, and is a sectional side view block diagram of the ice making tank which is the principal part of an apparatus. It is a plane block diagram of the ice making tank shown in FIG. It is a principal part enlarged view of FIG. Example 2 of the freeze concentration waste water treatment equipment concerning the present invention is the side section lineblock diagram of the ice making tank which is the principal part of the equipment. It is a plane block diagram which follows the III-III line of FIG. It is a plane block diagram of the ice making tank shown in FIG. 7, and has shown the state from which the skimming operation | movement of the apparatus was started. It is a plane block diagram of the ice making tank shown in FIG. 7, and has shown the intermediate state of the skimming operation | movement of an apparatus. It is a plane block diagram of the ice making tank shown in FIG. Example 3 of the freeze concentration wastewater treatment apparatus according to the present invention is a side sectional configuration diagram of an ice making tank which is a main part of the apparatus. It is a schematic diagram for demonstrating operation | movement of the apparatus of FIG. Example 4 of the freeze concentration wastewater treatment apparatus concerning this invention is shown, and it is a sectional side view of the ice making tank which is the principal part of an apparatus. FIG. 15 is a configuration diagram in the vicinity of the supercooling release plate of the apparatus for explaining the operation of the apparatus of FIG. 14. It is for demonstrating operation | movement of the apparatus of FIG. 14, and is a block diagram of the decompression suction apparatus vicinity provided in the apparatus. It is for demonstrating operation | movement of the apparatus of FIG. 14, and is a block diagram of the terminal vicinity vicinity of the belt conveyor provided in the apparatus. FIG. 7 shows a reference example 2 of the freeze-concentrated wastewater treatment apparatus according to the present invention, and is a configuration diagram of a supercooling release plate that is a main part of the apparatus and its vicinity. FIG. 7 shows a reference example 3 of the freeze-concentrated wastewater treatment apparatus according to the present invention, and is a configuration diagram of a supercooling release plate that is a main part of the apparatus and its vicinity. It is a schematic block diagram of the conventional freeze concentration wastewater processing apparatus.

Explanation of symbols

1,11,21,31 Ice making tank 2,12,22,32 Supercooling release plate (supercooling release means)
3, 13, 23, 33 Supercooled wastewater supply pipe 4, 14, 24, 34 Drop chute 4a, 14a, 24a, 34a Opening portion of drop chute 5,15 Scooping inclined surface member 5a, 15a Scooping inclined surface member Inclined surface 6, 16, 27 Waste water surface sweep member 6a, 27a Rotating shaft 6b, 16b, 27b Waste water surface sweep member body 6c, 16c, 27c Waste water surface sweep member sweeping hair 7, 17, 28, 39 Skimming means 16a Reciprocating drive shaft 25 Enclosure wall member 25a Side wall surface of enclosure wall member 26 Mesh member 35 Mesh belt 36 Belt conveyor 37 Belt press device 38a, 38b Protrusion member 40 Vacuum suction device 41 Suction pump 42 Decompression chamber 50, 60 Supercooling release plate (Supercooling release means)
51, 61, 63 Mounting plate 52 Thumb screw 62 Motor 64 Locking member 1013 Waste water supply pipe 1015 Supercooling water production heat exchanger 1016 Centrifuge 1017 Ice melting heat exchanger 1018 Waste water circulation supply pipe

Claims (4)

A supercooled water production heat exchanger for supercooling wastewater;
A supercooled wastewater supply pipe for transporting supercooled wastewater subcooled in the supercooled water production heat exchanger;
Supercooling release means for performing supercooling release of supercooling wastewater by receiving supercooling wastewater flowing down from the supercooling supply pipe, and generating ice particles;
An ice making tank provided at a lower part of the supercooling release means and into which wastewater from a wastewater source is injected;
Skimming means provided at the upper part of the ice making tank, for scooping out ice particles supplied from the supercooling release means from waste water;
A separator that is supplied with the ice particles separated by the skimming means and separates waste water accompanying the ice particles from the ice particles;
A waste water circulation supply pipe for supplying waste water in the ice making tank and waste water separated by the separator to the supercooled water production heat exchanger;
A freeze-concentrated wastewater treatment apparatus comprising:
The ice making tank is bottomed length box-like, the skimming means comprises a chute disposed so as to open above the wastewater surface of the ice making tank to inner wall surfaces facing each other of the ice making tank, fall the inclined surface members scoop provided on the front surface of each opening of the chute, the inclined surface of the inclined surface members raise each scoop the ice particles floating in the waste water surface is reciprocated between chute that the opposing freeze concentration wastewater treatment apparatus, characterized in that the is composed of a wastewater surface掃動member dropping to the each chute pushes toward the opening of the chute along. A supercooled water production heat exchanger for supercooling wastewater;
A supercooled wastewater supply pipe for transporting supercooled wastewater subcooled in the supercooled water production heat exchanger;
Supercooling release means for performing supercooling release of supercooling wastewater by receiving supercooling wastewater flowing down from the supercooling supply pipe, and generating ice particles;
An ice making tank provided at a lower part of the supercooling release means and into which wastewater from a wastewater source is injected;
Skimming means provided at the upper part of the ice making tank, for scooping out ice particles supplied from the supercooling release means from waste water;
A separator that is supplied with the ice particles separated by the skimming means and separates waste water accompanying the ice particles from the ice particles;
A waste water circulation supply pipe for supplying waste water in the ice making tank and waste water separated by the separator to the supercooled water production heat exchanger;
A freeze-concentrated wastewater treatment apparatus comprising:
The skimming means includes a drop chute that opens above the waste water surface in the ice making tank, an enclosing wall member provided on an outer periphery of the opening of the drop chute, and above the waste water surface directly below the enclosing wall member. The mesh member fixed horizontally so as to cover the entire surface of the waste water, and ice particles separated on the surface of the mesh member are pushed toward the opening of the falling chute along the enclosed wall surface of the enclosed wall member. A freeze-concentrated wastewater treatment apparatus comprising a wastewater surface sweeping member dropped into a dropping chute. A supercooled water production heat exchanger for supercooling wastewater;
A supercooled wastewater supply pipe for transporting supercooled wastewater subcooled in the supercooled water production heat exchanger;
Supercooling release means for performing supercooling release of supercooling wastewater by receiving supercooling wastewater flowing down from the supercooling supply pipe, and generating ice particles;
An ice making tank provided at a lower part of the supercooling release means and into which wastewater from a wastewater source is injected;
Skimming means provided at the upper part of the ice making tank, for scooping out ice particles supplied from the supercooling release means from waste water;
A separator that is supplied with the ice particles separated by the skimming means and separates waste water accompanying the ice particles from the ice particles;
A waste water circulation supply pipe for supplying waste water in the ice making tank and waste water separated by the separator to the supercooled water production heat exchanger;
A freeze-concentrated wastewater treatment apparatus comprising:
The skimming means includes a drop chute that opens above the surface of the waste water in the ice making tank and a belt provided above the surface of the waste water in the ice making tank in a mesh shape, and is scooped on the mesh belt. was ice grains transported to the opening of the chute is constituted by a belt conveyor to be introduced into the opening, accompanied the ice particles on the surface on the mesh belt at least a portion of said belt conveyor A freeze-concentrated wastewater treatment apparatus, characterized in that a belt press device for squeezing off the waste liquid is provided. A supercooled water production heat exchanger for supercooling wastewater;
A supercooled wastewater supply pipe for transporting supercooled wastewater subcooled in the supercooled water production heat exchanger;
Supercooling release means for performing supercooling release of supercooling wastewater by receiving supercooling wastewater flowing down from the supercooling supply pipe, and generating ice particles;
An ice making tank provided at a lower part of the supercooling release means and into which wastewater from a wastewater source is injected;
Skimming means provided at the upper part of the ice making tank, for scooping out ice particles supplied from the supercooling release means from waste water;
A separator that is supplied with the ice particles separated by the skimming means and separates waste water accompanying the ice particles from the ice particles;
A waste water circulation supply pipe for supplying waste water in the ice making tank and waste water separated by the separator to the supercooled water production heat exchanger;
A freeze-concentrated wastewater treatment apparatus comprising:
The skimming means includes a drop chute that opens above the surface of the waste water in the ice making tank and a belt provided above the surface of the waste water in the ice making tank in a mesh shape, and is scooped on the mesh belt. was ice grains transported to the opening of the chute is constituted by a belt conveyor to be introduced into the opening, accompanied the ice particles on the surface on the mesh belt at least a portion of said belt conveyor A freeze-concentrated wastewater treatment apparatus, characterized in that a reduced-pressure suction device for sucking and removing waste liquid is provided.

Images