JP2015136680A - Dewatering equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate the speed of floc dewatering, and to reasonably recover dewatered cake.SOLUTION: Dewatering equipment comprises a plurality of storage tanks 4 that store flocs, a dewatering mechanism that forms dewatered cake by dewatering the flocs in each of the storage tanks 4, and a mixing screw 7 that recovers the dewatered cake formed in the storage tanks 4. The mixing screw 7 is movable in the arrangement direction of the storage tanks 4 in a space formed below the plurality of storage tanks 4, and is located below the storage tank 4 in a state where a bottom 4a of the storage tank 4 is opened to receive the dewatered cake formed in the storage tank 4 through the bottom 4a.

Description

  The present invention relates to a dehydration treatment facility, and more particularly to a dehydration treatment facility that dehydrates flocs formed by adding a flocculant to turbid water or the like to obtain a dehydrated cake.

  As a turbid water purification technique, a method of forming a floc containing solids by adding a flocculant to the turbid water and reacting the solids in the turbid water with the flocculant is often used. Since the floc formed by such a method has a high water content, it is dehydrated in a stage prior to disposal. The equipment for flock dewatering is already well known, and an example thereof is a dewatering apparatus using a filter cloth like the apparatus described in Patent Document 1.

  In the dehydration apparatus described in Patent Document 1, flocculant is added to polishing wastewater to form a floc, the wastewater containing the floc is guided to a filtration chamber, and the floc-containing water is solidified with a filter cloth in the filtration chamber. Separate the liquid. Thereby, the water | moisture content in a flock passes through a filter cloth, and is collect | recovered as filtered water. On the other hand, the solid content in the floc accumulates on the filter cloth surface to form a dehydrated cake. And in the dehydration processing apparatus described in Patent Document 1, after the dehydration is completed, the dehydrated cake is peeled off from the surface of the filter cloth, and conveyed to the cart for conveying the cake through the shooter. The dewatered cake is collected by such a cart and then transported to a predetermined disposal site.

JP 2001-334110 A

  By the way, a plurality of dehydration treatment apparatuses may be provided for the purpose of improving the speed of the flock dehydration treatment. In other words, in each dehydration apparatus, a series of steps of receiving flocks, dehydrating, peeling and discharging of dehydrated cake are performed intermittently. However, if there are multiple dehydration apparatuses, one dehydration apparatus can be used. While the dewatered cake is being peeled off, it is possible to receive the floc and dewater in another dewatering apparatus. As a result, the acceptance and dewatering of flocs are continuously performed, so that the processing speed can be increased.

  On the other hand, if an attempt is made to prepare a device for collecting the dehydrated cake discharged from each dehydration processing device for each dehydration processing device, the number of devices increases correspondingly and the equipment cost increases. Further, in such a configuration, the recovery device for the dehydration apparatus that is not discharging the dewatered cake does not operate, so it is unreasonable from the viewpoint of the operation efficiency of the device.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a dehydration apparatus capable of speeding up the dehydration process of flocs and rationally recovering the dehydrated cake. It is.

  According to the dehydrating apparatus of the present invention, the subject is (A) storing a floc containing solids and having a bottom that can be opened and closed, and (B) dehydrating the floc in the storage tank. A dehydrating mechanism for forming the solid dehydrated cake, and (C) a recovery unit for collecting the dehydrated cake formed in the storage tank, and (D) the storage tank in a predetermined direction. A plurality of the containers are arranged in a line, and (E) the collector is movable in the predetermined direction within a space formed at a lower part of the plurality of storage tanks, and the bottom part is in an open state. The problem is solved by receiving the dehydrated cake located in the lower part of the storage tank and formed in the storage tank through the bottom.

  In the dehydration processing apparatus of the present invention having the above-described configurations (A) to (E), since a plurality of storage tanks are provided, it is possible to continuously receive and dewater flocs, and dewater the flocs. Will progress faster. In addition, the dewatering cake collector is a common device among the storage tanks. That is, in the dehydration processing apparatus of the present invention, when the collector moves in the space formed in the lower part of the plurality of storage tanks, when the bottom of each storage tank opens and the dewatered cake is discharged, It is possible to accurately collect the dehydrated cake by placing a collector under the storage tank. Thereby, compared with the case where a collection device is provided for each storage tank, the equipment cost is suppressed, and the operation efficiency of the collection device is also improved.

In the above dehydrating apparatus, the recovery unit is a mixing screw, and includes a solidifying agent adding device that adds a solidifying agent into the mixing screw, and the mixing screw includes the received dehydrated cake and the solidifying agent. It is more preferable to knead the solidifying agent added by the addition device.
If it is said structure, the effect acquired by making a collection device into a common apparatus between storage tanks will become more meaningful. That is, the mixing screw as a device for adjusting the dehydrated cake to a predetermined hardness is a relatively large device, and requires a starting power (electric power). Therefore, the effect obtained by using the mixing screw as a common device between the storage tanks, that is, the effect of reducing the equipment cost and improving the operation efficiency is remarkably exhibited.

In the dehydration apparatus, a controller that controls the transport mechanism that transports the recovery device in the predetermined direction within the space, the opening and closing of the bottom of each of the plurality of storage tanks, and the operation of the transport mechanism. And the controller, before switching the bottom of any one of the plurality of storage tanks from a closed state to an open state, the collector in the lower part of any one of the storage tanks It is even more preferable that the transport mechanism is controlled such that the bottom of the one storage tank is switched from the closed state to the open state after the recovery device reaches the lower part of the one storage tank. It is.
If it is said structure, when a controller controls a conveyance mechanism, a collection device comes to be appropriately arrange | positioned in the lower part of the storage tank from which a dewatering cake is discharged | emitted. In addition, the timing at which the controller opens the bottom of the storage tank is set to be after the collector arrives at the lower part of the storage tank, so that the dehydrated cake spills out without being collected by the collector. It can be avoided.

In the above dehydration apparatus, the storage tank may be further provided with a base member having a leg portion that can be expanded and contracted, the controller controls expansion and contraction of the leg portion, and the collector is A protruding guide portion is provided at the upper end portion, and the dehydrated cake discharged from the bottom portion is received in a state where the lower end of the bottom portion is positioned inside the guide portion, and the controller is configured to store any one of the storage tanks. It is more and more preferable that the leg portion is extended before controlling the transport mechanism so that the recovery device is directed to the lower portion of the container, and the leg portion is contracted after the recovery device reaches the lower portion of any one of the storage tanks. It is.
With the above configuration, when the collector collects the dehydrated cake, the controller contracts the leg portion of the base portion, so that the lower end of the bottom of the storage tank enters the inside of the guide portion of the collector and Become. Thereby, a collection device comes to collect a dehydrated cake appropriately and reliably. In addition, when the collector is moved, the controller extends the leg of the base portion, so that the lower end of the bottom of the storage tank inside the guide portion of the collector comes out of the guide portion. The movement will be performed smoothly.

In the dehydration apparatus, the dehydration mechanism includes a bag-shaped film body installed in the storage tank, and the air inside the film body is exhausted to remove the floc in the storage tank. More preferably, the dehydrated cake is formed on the outer surface of the film body by dehydration, and the dehydrated cake is peeled off from the outer surface by enclosing air inside the film body.
If it is said structure, the structure which the lower end of the bottom part of a storage tank will enter into the inner side of the guide part of a collection | recovery device at the time of collection | recovery of a dewatering cake becomes more advantageous. If it demonstrates easily, since a dehydrated cake will be peeled by enclosing air in a film | membrane body, there exists a possibility that the peeled dehydrated cake may scatter. At this time, if the lower end of the bottom portion of the storage tank is in the inside of the guide portion of the collecting device, even if the dehydrated cake is scattered, the collecting device is appropriately collected.

  According to the dehydrating apparatus of the present invention, it is possible to speed up the dehydration processing of flocs and rationally recover the dehydrated cake.

It is a conceptual diagram of a muddy water cleaning system. It is a figure which shows the mode in the storage tank in each time in a dehydration process (the 1). It is a figure which shows the mode in the storage tank in each time in a dehydration process (the 2). It is a figure which shows the mode in the storage tank in each time in a dehydration process (the 3). It is a figure which shows the mode in the storage tank in each time in a dehydration process (the 4). It is a figure which shows the whole image of the dehydration processing equipment which concerns on one Embodiment of this invention. The state in which the dehydration module was loaded on the vehicle is illustrated. It is a side view of a storage tank. It is explanatory drawing regarding the structure of the bottom part of a storage tank. It is a figure which shows the two storage tanks located in a line with the predetermined direction. It is sectional drawing which shows the internal structure of a mixing screw. It is explanatory drawing of the guide part of a mixing screw. It is explanatory drawing of a conveyance mechanism. It is a figure which shows the state of the dehydration processing equipment at the time of mixing screw conveyance. It is a control block diagram which shows the structure of the dehydration processing equipment which concerns on one Embodiment of this invention. It is a flowchart which shows the flow of a dehydration process.

  Hereinafter, an embodiment of the present invention (hereinafter, this embodiment) will be described with reference to the drawings. The embodiment described below is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. Further, the present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

  The dehydration processing facility 10 according to the present embodiment is incorporated in the muddy water cleaning system S illustrated in FIG. 1, and dewaters flocs formed on the upstream side of the system S. FIG. 1 is a conceptual diagram of a muddy water cleaning system S.

  The outline of the turbid water cleaning system S will be described. While the turbid water containing solids such as metal particles is being fed, the flocculant feeding device 1 feeds the flocculant into the water feeding line. Thereby, the solid in muddy water reacts with the flocculant to form floc. When the water containing the floc is transported to the sedimentation tank 2, the floc settles and accumulates at the bottom of the sedimentation tank 2, and the separated clear water is stored in the upper layer of the sedimentation tank 2 in layers. Become. The floc deposited on the bottom of the settling tank 2 is appropriately extracted and conveyed by the slurry pump 3. Then, the dehydration processing facility 10 receives the transferred flock in the storage tank 4, and then performs a process of dehydrating the flock in the storage tank 4.

  The dehydration process in the storage tank 4 will be described. Inside the storage tank 4, as shown in FIG. 1, a plurality of bag-like film bodies (specifically, filter cloth bodies 5a) are provided on a frame (not shown). A unit (hereinafter referred to as a filter cloth unit 5) configured to be supported is arranged. If it demonstrates in detail, in the storage tank 4, the two filter cloth body units 5 will be arrange | positioned so that it may rank up and down. Each of the plurality of filter cloth bodies 5 a provided in each filter cloth body unit 5 is connected to the vacuum pump 6. The vacuum pump 6 performs an exhaust operation for exhausting air inside each filter cloth body 5a.

  Under the above configuration, the dehydration process is performed on the floc stored in the storage tank 4 by the vacuum dehydration method. Hereinafter, the procedure of the dehydration process will be described with reference to FIGS. 2A to 2D are views showing the state in the storage tank 4 at each time point during the dehydration process.

  First, the dehydration process starts when the vacuum pump 6 performs an evacuation operation in a state where a predetermined amount of floc is stored in the storage tank 4 as shown in FIG. 2A. When the inside of each filter cloth body 5a is depressurized by such an exhaust operation, the floc is drawn to the outer surface of the filter cloth body 5a. And while the water | moisture content in a floc passes the filter cloth body 5a, the solid substance in a floc comes to stay on the outer surface of the filter cloth body 5a. That is, when the vacuum pump 6 performs the exhausting operation, solid-liquid separation of flocs by the filter cloth body 5a is performed. The liquid water that has passed through the filter cloth body 5 a, that is, filtered water, is sent to the filtered water tank 9 and stored in the filtered water tank 9.

  After the vacuum pump 6 evacuates for a certain period of time, as shown in FIG. 2B, of the two filter cloth units 5 arranged vertically, the filter cloth body 5a of the upper filter cloth unit 5 is not used. Stop the exhaust operation. As a result, air is sealed inside each filter cloth body 5a of the upper filter cloth body unit 5, and as a result, solid matter attached to the outer surface of the filter cloth body 5a is peeled off. On the other hand, the exhaust operation is continuously performed on the filter cloth body 5a of the lower filter cloth body unit 5. Thereby, in each filter cloth body 5a of the lower filter cloth body unit 5, the solid matter adhering to the outer surface gradually increases and accumulates in layers.

  Thereafter, the evacuation operation by the vacuum pump 6 and the interruption (strictly speaking, only a partial interruption) are repeated so that the states of FIGS. 2A and 2B are alternately switched. Thereby, in the upper filter cloth body unit 5, the state in which the adhesion amount of the solid matter on the outer surface of the filter cloth body 5a is relatively small continues. On the other hand, in the lower filter cloth body unit 5, a fixed deposit, that is, a dehydrated cake is formed on the outer surface of the filter cloth body 5 a. Thus, the upper and lower two filter cloth body units 5 are used for different purposes, and the upper filter cloth body unit 5 is used mainly for the purpose of securing filtered water, and the lower filter cloth body unit 5 is used. Is mainly used for the purpose of forming a dehydrated cake.

  Then, when the dehydration process is performed for a predetermined time, the residual floc in the storage tank 4 is discharged while continuing the exhaust operation by the vacuum pump 6. About the discharged | emitted residual floc, it is good to convey toward the sedimentation tank 2 with a return pump not shown, for example. After the residual floc is discharged, the bottom 4a of the storage tank 4 is opened as shown in FIG. 2C, and the exhaust operation by the vacuum pump 6 is stopped in conjunction with the opening of the bottom 4a. As a result, air is sealed inside each filter cloth body 5a of the lower filter cloth body unit 5, and as a result, the dehydration formed on the outer surface of the filter cloth body 5a as shown in FIG. 2D. The cake becomes peeled.

  The peeled dehydrated cake is discharged out of the tank through the open bottom 4a of the storage tank 4. The discharged dehydrated cake is received by a collecting device disposed at a lower position of the storage tank 4 and subjected to a predetermined process in the collecting device. Specifically, in this embodiment, a mixing screw 7 (strictly speaking, a mixing screw conveyor) is provided as a collecting device. The mixing screw 7 receives the dehydrated cake falling from the storage tank 4 and guides it into the screw chamber. On the other hand, a solidifying agent is added to the screw chamber from the solidifying agent adding device 8, and the mixing screw 7 kneads the received dehydrated cake and the solidifying agent added by the solidifying agent adding device 8 to form a kneaded product. The kneaded material adjusted to a predetermined hardness is discharged from a discharge port (not shown) provided in the mixing screw 7, and is finally transported to a predetermined disposal site by a transport vehicle or the like.

  By the way, in this embodiment, as shown in FIG. 1, the storage tank 4 is provided with two or more, specifically 2 units | sets. Further, the flock conveyance line extending from the slurry pump 3 is branched toward each of the two storage tanks 4, and switching valves V1 and V2 including electromagnetic valves are respectively installed on the branch lines. Yes. By opening and closing the switching valves V1 and V2, it is possible to switch the path through which the floc is actually transported and the storage tank 4 that is the transport destination.

  And in each storage tank 4, a series of processes (specifically, acceptance of flock, dewatering, peeling and discharging of dewatered cake) during the dewatering process are performed intermittently. On the other hand, in this embodiment, since the two storage tanks 4 are provided, it becomes possible to perform a dehydration process continuously. That is, while the bottom 4a is opened in one storage tank 4 and the dewatered cake is peeled and discharged, it is possible to receive and dewater flock in the other storage tank 4. Thereby, in this embodiment, compared with the structure where the storage tank 4 is only 1 unit | set, it becomes possible to perform a dehydration process more rapidly.

  Moreover, in this embodiment, while the storage tank 4 is provided with two or more, the installation number of the mixing screws 7 which collect | recover the dewatering cake discharged | emitted from the storage tank 4 is only one. That is, in this embodiment, the mixing screw 7 is a common device between the storage tanks 4. On the other hand, the mixing screw 7 is a relatively large device and requires power (electric power) for starting. Therefore, the installation number of the mixing screws 7 is only one, so that the equipment cost is reduced and the operation efficiency is improved.

  Based on the contents described above, the configuration of the dehydration processing facility 10 according to the present embodiment will be described in more detail below. The dehydration processing facility 10 according to the present embodiment has an appearance shown in FIG. 3 and includes a dehydration module 11 and a recovery module 12 illustrated in the figure. FIG. 3 is a diagram illustrating an overall image of the dehydration processing facility 10 according to the present embodiment. For convenience of explanation, a cross-sectional view of the mixing screw 7 is shown in FIG.

  The dewatering module 11 includes a connection pipe P connected to the discharge port of the slurry pump 3 via a flexible tube and the like, and is a mechanism for receiving and dewatering a floc conveyed through the connection pipe P.

  The dehydrating module 11 includes two storage tanks 4, filter cloth body units 5 installed in the respective storage tanks 4, a vacuum pump 6, and a filtered water tank 9 as main components. The storage tank 4, the vacuum pump 6, and the filtered water tank 9 are fixed and supported by a base member 20 that is a steel frame, and are modularized. The base member 20 is a member that forms a frame for the storage tank 4, and includes a base member main body 21 and a plurality of leg portions 22 that extend downward from the base member main body 21. The base member main body 21 forms a base that supports the storage tank 4, the vacuum pump 6, and the filtered water tank 9. Each of the plurality of leg portions 22 includes a jack portion 22a at a midway position thereof, and can be expanded and contracted in the vertical direction as the jack portion 22a moves up and down.

  As shown in FIG. 4, the dehydration module 11 can be loaded on the loading platform of the transport vehicle T and can be transported alone. FIG. 4 illustrates a state in which the dehydration module 11 is loaded on the transport vehicle T. As shown in the figure, during the module transportation, each leg portion 22 of the base member 20 is in a state where the jack portion 22a is lowered and contracted.

  When the transport vehicle T loaded with the dewatering module 11 arrives at the destination, the jack portion 22a of each leg portion 22 rises and each leg portion 22 extends. In such a state, the lower ends of the leg portions 22 are attached to the ground, and the base member main body 21 is slightly lifted from the loading platform of the transport vehicle T. Thereafter, the transport vehicle T is pulled out, whereby the installation of the dewatering module 11 is completed.

  The constituent devices of the dehydration module 11 will be described. The storage tank 4 is a tank for storing flocs containing solids, and in this embodiment, the two hopper portions are connected as shown in FIG. Yes. FIG. 5 is a side view of the storage tank 4. The internal spaces of the two hopper parts constituting the storage tank 4 communicate with each other. In addition, two upper and lower filter cloth body units 5 are installed in the internal space of each hopper. In other words, a total of four filter cloth body units 5 are installed in the storage tank 4.

  Each hopper is provided with a shooter-like bottom portion 4a, and the bottom portion 4a can be freely opened and closed. More specifically, the lower end of the bottom 4a is an open end, and the gate 4b shown in FIG. 6 is rotatably disposed at the open end. With the turning operation of the gate 4b, the open / close state of the lower end of the bottom 4a is switched. FIG. 6 is a diagram relating to the structure of the bottom 4 a of the storage tank 4.

  In the present embodiment, as described above, two storage tanks 4 are provided, and these two storage tanks 4 are fixed to the base member main body 21 in a state of being adjacent to each other as shown in FIG. Has been. That is, in the present embodiment, the two storage tanks 4 are arranged in a state aligned in a predetermined direction (specifically, a direction that coincides with the depth direction of the storage tank 4 and a direction that penetrates the paper surface in FIG. 5). Has been. FIG. 7 is a view showing two storage tanks 4 arranged in a predetermined direction, and is a view when the two storage tanks 4 shown in FIG. 5 are viewed from the direction A in the figure.

The filter cloth body unit 5 (strictly speaking, the lower filter cloth body unit 5 of the upper and lower stages) and the vacuum pump 6 constitute the dewatering mechanism of the present invention, and dewater the floc in each storage tank 4. Is for. More specifically, the vacuum pump 6 exhausts the air in each filter cloth body 5a in the filter cloth body unit 5 so that the floc in the storage tank 4 is solid-liquid separated, and the liquid water in the flock is filtered. It passes through the cloth body 5a. On the other hand, the solid matter in the flock stays on the outer surface of the filter cloth body 5a to form a dehydrated cake. Further, when the vacuum pump 6 is stopped, air is sealed in the filter cloth body 5a, and the dewatered cake attached to the outer surface of the filter cloth body 5a is peeled off.
The filtered water tank 9 is a container for temporarily storing filtered water that is liquid water that has passed through the filter cloth body 5a.

  The collection module 12 is a mechanism that collects the dehydrated cake discharged from the bottom portion 4a in conjunction with the opening of the bottom portion 4a of the storage tank 4, and adjusts the hardness of the dehydrated cake to a desired hardness. The collection module 12 includes a mixing screw 7, a solidifying agent addition device 8, and a transport mechanism 23 described later as main components. Similar to the dehydration module 11, the collection module 12 configured by modularizing these devices can be transported alone, and can be loaded on the loading platform of the transport vehicle T.

  When the collection module 12 is transported to the destination, it is lowered from the loading platform and set at a predetermined position. More specifically, the collection module 12 lowered from the loading platform is set so that the mixing screw 7 is positioned in the space below the storage tank 4 as shown in FIG.

  The mixing screw 7 is located at a position below the storage tank 4 where the bottom 4a is in an open state, and collects the dewatered cake formed in the storage tank 4. When the structure of the mixing screw 7 is outlined, as shown in FIG. 8, the screw 7a, a cylindrical casing 7b constituting a screw chamber, and a guide portion 7c provided so as to protrude from the upper surface of the casing 7b are provided. FIG. 8 is a cross-sectional view showing the internal structure of the mixing screw 7.

  Here, the guide portion 7c is a portion provided at the upper end portion of the mixing screw 7 for the purpose of guiding the dewatered cake dropped from the bottom portion 4a of the storage tank 4 into the screw chamber, and as shown in FIG. The shape is narrower as it is located in the position. FIG. 9 is an explanatory diagram of the guide portion 7c of the mixing screw 7, and is a view when the mixing screw 7 illustrated in FIG. 8 is viewed from the BB direction in the drawing.

  In this embodiment, when the mixing screw 7 receives the dehydrated cake at a position below the storage tank 4 in which the bottom 4a is open, the lower end of the bottom 4a is positioned inside the guide 7c (see FIG. 3). The state shown in FIG. In this state, the mixing screw 7 receives the dehydrated cake, so that the dehydrated cake is appropriately and reliably guided to the screw chamber. In particular, in this embodiment, since the dehydrated cake attached to the outer surface of the filter cloth body 5a is peeled by enclosing air in the filter cloth body 5a, the peeled dehydrated cake may be scattered. At this time, if the lower end of the bottom portion 4a of the storage tank 4 enters the inside of the guide portion 7c, even if the dewatered cake is scattered, it can be appropriately guided to the screw chamber.

  In addition, in order for the lower end of the bottom part 4a of the storage tank 4 to be located inside the guide part 7c, the lower end of the bottom part 4a is positioned below the upper end of the guide part 7c. Such a positional relationship is achieved by lowering the jack portion 22a of each leg portion 22 of the base member 20 and contracting each leg portion 22.

  The solidifying agent adding device 8 is a device for feeding a predetermined amount of solidifying agent into the screw chamber after the mixing screw 7 collects the dehydrated cake. In the present embodiment, the solidifying agent addition device 8 is fixed to a support base (not shown) attached to a predetermined location of the casing 7b of the mixing screw 7.

  The transport mechanism 23 is a mechanism for transporting the mixing screw 7 (strictly, both the mixing screw 7 and the solidifying agent addition device 8 fixed thereto) in a space formed in the lower part of the two storage tanks 4. is there. Here, the conveyance direction by the conveyance mechanism 23 coincides with the direction in which the two storage tanks 4 are arranged. That is, in this embodiment, the mixing screw 7 is movable in the direction in which the two storage tanks 4 are arranged in the above space. Specifically, the mixing screw 7 is directly below the one storage tank 4 and the other. It is possible to reciprocate between the position directly below the storage tank 4.

  The configuration of the transport mechanism 23 is not particularly limited, but the configurations shown in FIGS. 8 and 10 are conceivable as an example. FIG. 10 is an explanatory diagram of the transport mechanism 23. In FIG. 10, the mixing screw 7 is shown somewhat simplified.

  The transport mechanism 23 having the configuration shown in FIGS. 8 and 10 will be described. A steel frame 24 on which the mixing screw 7 is placed, a caster 25 fixed to the lower portion of the frame 24, and two storage tanks And a rail 26 arranged along the direction in which the four are arranged. Further, the transport mechanism 23 includes a transport motor and a transmission mechanism (not shown). When the power of the transport motor is transmitted to the casters 25 via the transmission mechanism, the casters 25 travel along the rails 26. As a result, the frame body 24 and the mixing screw 7 loaded on the frame body 24 move in the direction in which the two storage tanks 4 are arranged.

  By providing the above transport mechanism 23, when the open / closed state of the bottom 4a of each storage tank 4 is switched, the mixing screw 7 moves in conjunction with this. Thereby, in this embodiment, the mixing screw 7 is arrange | positioned directly under the storage tank 4 (in other words, the storage tank 4 from which a dewatered cake is discharged | emitted from the bottom part 4a) in which the bottom part 4a was an open state, and said storage tank It becomes possible to receive the dewatering cake discharged | emitted from 4 appropriately.

In addition, when the mixing screw 7 receives the dehydrated cake discharged from the storage tank 4, the lower end of the bottom portion 4a is positioned inside the guide portion 7c. If it is going to convey mixing screw 7 in this state, guide part 7c will interfere with bottom part 4a. For this reason, when the mixing screw 7 is conveyed, the jack portions 22a of the leg portions 22 of the base member 20 are raised to extend the leg portions 22 as shown in FIG. Thereby, the bottom part 4a of the storage tank 4 which has entered the inside of the guide part 7c until then comes to be located outside (above) the guide part 7c. As a result, the mixing screw 7 moves smoothly without the guide portion 7c interfering with the bottom portion 4a.
FIG. 11 is a diagram illustrating a state of the dehydration processing facility 10 when the mixing screw 7 is conveyed, and corresponds to FIG.

  When the mixing screw 7 moves from the lower part of one storage tank 4 to the lower part of the other storage tank 4, the jack part 22a is lowered and the leg parts 22 of the base member 20 are returned to the contracted state. Thereby, after the mixing screw 7 is moved, the lower end of the bottom portion 4a of the storage tank 4 (strictly speaking, the storage tank 4 at the movement destination) is again positioned inside the guide portion 7c.

  By the way, in the dehydration processing facility 10 according to the present embodiment, all of the series of steps during the dehydration process are automatically performed. More specifically, as shown in FIG. 12, the dehydration processing facility 10 includes a controller 30 that controls the operation of each device described above, and an operation panel 31 that receives an input operation by an operator. FIG. 12 is a control block diagram illustrating the configuration of the dehydration processing facility 10.

  The controller 30 controls each device in the dehydration processing facility 10, and in particular in the present embodiment, controls each device by timer control. That is, in this embodiment, the execution time is set in advance for each process during the dehydration process, and the controller 30 sets each device so that each process during the dehydration process is executed for the set execution time. Control. Note that the condition value (ie, operation management value) of the control by the controller 30 including the set value of the execution time of each process during the dehydration process can be changed through the operation panel 31.

  The object to be controlled by the controller 30 will be described. As shown in FIG. 12, the operation (start / stop) of the slurry pump 3, the on / off of the switching valves V 1, V 2, the operation (start / stop) of the vacuum pump 6, Opening and closing of the gate 4b, operation (start / stop) of the mixing screw 7, transport operation by the transport mechanism 23, solidifying agent addition operation by the solidifying agent adding device 8, and lifting and lowering operation of the jack portion 22a in the leg portion 22 of the base member 20 Is mentioned. Here, the opening and closing of the gate 4b in each storage tank 4 means the opening and closing of the bottom 4a of each of the two storage tanks 4. Moreover, the raising / lowering operation | movement of the jack part 22a means the expansion-contraction of the leg part 22. As shown in FIG.

  Hereinafter, the control contents of the controller 30 in each process during the dehydration process will be described with reference to FIG. FIG. 13 is a flowchart showing the flow of the dehydration process.

  At the start of the dehydration process, the controller 30 activates the slurry pump 3 to extract the flock from the bottom of the sedimentation tank 2 and transport it toward the storage tank 4 (S001). At the same time, the controller 30 controls the opening and closing of the two switching valves V1 and V2 so that the floc is conveyed only to one storage tank 4 (S002). Thereby, in one storage tank 4, reception of a flock comes to be started. At this time, the mixing screw 7 is located below the other storage tank 4 (the storage tank 4 that has not received the flock). Further, each leg portion 22 of the base member 20 is in a contracted state. For this reason, the other storage tank 4 is in a state in which the lower end of the bottom portion 4 a enters the inside of the guide portion 7 c of the mixing screw 7.

  After accepting the floc in one storage tank 4, the controller 30 activates the vacuum pump 6 to dehydrate the floc stored in the storage tank 4 (S003). At this time, among the upper and lower filter cloth body units 5 arranged in the storage tank 4, the vacuum pump 6 connected to each filter cloth body 5a of the lower filter cloth body unit 5 is continuously operated. In contrast, the vacuum pump 6 connected to each filter cloth body 5a of the upper filter cloth body unit 5 is controlled to be intermittently operated.

  Then, when a predetermined time has elapsed since the start of acceptance of the floc in one storage tank 4 (S004), the controller 30 switches the flock transport destination from one storage tank 4 to the other storage tank 4. Thus, the opening and closing of the two switching valves V1 and V2 is controlled (S005). Thereby, acceptance of the floc in one storage tank 4 is complete | finished, and reception of the flock in the other storage tank 4 is started instead.

  Moreover, the controller 30 raises the jack part 22a of each leg part 22 of the base member 20 with said valve control S005 (S006). Thereby, as a result of the leg portions 22 extending, the bottom portion 4a of the storage tank 4 that has entered the inside of the guide portion 7c is positioned outside (above) the guide portion 7c.

  Thereafter, the controller 30 controls the transport mechanism 23 to move the mixing screw 7 from the lower position of the other storage tank 4 to the lower position of the one storage tank 4 (S007). After the mixing screw 7 reaches the lower position of the one storage tank 4, the controller 30 lowers the jack portions 22a of the leg portions 22 of the base member 20 and contracts the leg portions 22 (S008). Thereby, the lower end of the bottom portion 4a of one storage tank 4 enters the guide portion 7c of the mixing screw 7.

  When the above steps are completed, the controller 30 performs the control for discharging the residual floc remaining in the one storage tank 4, and then turns the gate 4 b provided on the bottom 4 a of the storage tank 4. Control is performed (S009). Thereby, the bottom part 4a of the one storage tank 4 which was in a closed state comes to switch to an open state.

  Thereafter, when the controller 30 stops the vacuum pump 6 (S010), the dehydrated cake comes to be peeled off from the filter cloth bodies 5a of the filter cloth body unit 5 (strictly, the lower filter cloth body unit 5). The peeled dehydrated cake is discharged out of the storage tank 4 through the opened bottom portion 4a, and is received by the mixing screw 7 located below the dehydrated cake.

  And when predetermined time passes after the bottom part 4a of one storage tank 4 switches to an open state (S011), while the controller 30 starts the mixing screw 7 (S012), it controls the solidification agent addition apparatus 8 and controls. A predetermined amount of solidifying agent is charged into the screw chamber (S013). As a result, the dewatered cake and the solidifying agent are kneaded in the mixing screw 7, and the hardness of the dehydrated cake (strictly, the kneaded material) is adjusted to have a predetermined hardness. Then, when a predetermined time has elapsed since the mixing screw 7 was started (S014), the controller 30 stops the mixing screw 7 (S015).

While the dehydrating cake is being collected and the hardness is adjusted by the mixing screw 7, the controller 30 activates the vacuum pump 6 to dehydrate the floc stored in the other storage tank 4 (S016). In FIG. 13, for convenience of illustration, a step (S016) of starting the vacuum pump 6 after the mixing screw 7 is stopped (S015) is described. It starts when the tank 4 switches to the other storage tank 4.
Thereafter, the controller 30 repeatedly executes the above-described control contents S004 to S016.

  As described above, in this embodiment, the controller 30 controls the slurry pump 3, the switching valves V <b> 1 and V <b> 2, and the vacuum pump 6 so as to continuously receive and dewater flocs. Moreover, the controller 30 controls the conveyance mechanism 23 so that the mixing screw 7 is arrange | positioned under the storage tank 4 from which a dewatering cake is discharged | emitted from the bottom part 4a.

  In particular, in this embodiment, the controller 30 mixes the mixing screw at the bottom of the storage tank 4 before switching the bottom 4a of any one of the storage tanks 4 from the closed state to the open state. The transport mechanism 23 is controlled so that 7 is directed. Then, after the mixing screw 7 reaches the lower part of the storage tank 4, the controller 30 controls the gate 4b provided on the bottom 4a to switch the bottom 4a from the closed state to the open state. As described above, in this embodiment, the timing for opening the bottom 4 a of the storage tank 4 is set to be after the mixing screw 7 reaches the lower part of the storage tank 4. As a result, it is possible to avoid a situation in which the dehydrated cake is spilled without being recovered by discharging the dehydrated cake in the storage tank 4 while the mixing screw 7 is not disposed below the storage tank 4. Is possible.

  Further, in the present embodiment, the controller 30 extends each leg portion 22 of the base member 20 before controlling the transport mechanism 23 so that the mixing screw 7 is directed to the lower part of the destination storage tank 4. After the screw 7 reaches the lower part of the destination storage tank 4, the leg portion 22 is contracted again. As a result, when the dewatered cake is recovered, the lower end of the bottom 4a of the storage tank 4 enters the inside of the guide portion 7c of the mixing screw 7, so that the dewatered cake is recovered appropriately and reliably in the mixing screw 7. It becomes like this. Further, when the mixing screw 7 is transported, the lower end of the bottom portion 4a of the storage tank 4 located inside the guide portion 7c comes out of the guide portion 7c, so that the mixing screw 7 can be moved smoothly. Become.

  Incidentally, in this embodiment, the control of the controller 30 is a timer control, and each process during the dehydration process is executed for a set execution time, but is not limited to this. . For example, a sensor for monitoring the state of each device in the dehydration processing facility 10 may be provided, and the control of the controller 30 may be executed by receiving an output signal from the sensor as a trigger. For example, a sensor for monitoring the water level (level) of the floc stored in the storage tank 4 is provided, and when the controller 30 receives an output signal from the sensor, switching is performed so as to switch the storage tank 4 that receives the flock. The opening and closing of the valves V1 and V2 may be controlled. In addition, a sensor for monitoring the amount of dehydrated cake formed may be provided, and a series of steps relating to dewatered cake collection may be started when an output signal from the sensor is received. Also, a sensor for monitoring the hardness of the dewatered cake kneaded with the solidifying agent in the mixing screw 7 is provided, and when the output signal from the sensor is received, the operation of the mixing screw 7 is controlled (stopped). It is good.

DESCRIPTION OF SYMBOLS 1 Flocculant charging device 2 Sedimentation tank 3 Slurry pump 4 Storage tank 4a Bottom part 4b Gate 5 Filter cloth body unit 5a Filter cloth body 6 Vacuum pump 7 Mixing screw 7a Screw, 7b Casing, 7c Guide part 8 Solidifying agent addition apparatus 9 Filtration Water tank 10 Dehydration treatment facility 11 Dehydration module 12 Recovery module 20 Base member 21 Base member main body 22 Leg portion 22a Jack portion 23 Transport mechanism 24 Frame body 25 Caster 26 Rail 30 Controller 31 Operation panel P Connection piping S Muddy water purification system T Transport vehicle V1, V2 switching valve

Claims (5)

A storage tank for storing flocs containing solids and having a bottom that can be freely opened and closed,
A dehydration mechanism for dehydrating the floc in the storage tank to form a solid dehydrated cake;
A recovery device for recovering the dehydrated cake formed in the storage tank,
A plurality of the storage tanks are arranged in a predetermined direction,
The collector is movable in the predetermined direction within a space formed in the lower part of the plurality of storage tanks, and is located in the lower part of the storage tank in which the bottom portion is in an open state. A dehydration processing facility, wherein the formed dewatered cake is received through the bottom. The collector is a mixing screw;
A solidifying agent addition device for adding a solidifying agent to the mixing screw;
The dehydration equipment according to claim 1, wherein the mixing screw kneads the received dewatered cake and the solidifying agent added by the solidifying agent adding device. A transport mechanism for transporting the recovery device in the predetermined direction within the space;
A controller for controlling the opening and closing of each of the plurality of storage tanks and the operation of the transport mechanism,
The controller is configured such that, before the bottom portion of any one of the plurality of storage tanks is switched from a closed state to an open state, the collector is directed to a lower portion of the one storage tank. 3. The transport mechanism is controlled, and the bottom of any one of the storage tanks is switched from a closed state to an open state after the recovery device reaches the lower part of the one of the storage tanks. Dehydration processing equipment described in 1. The base of the storage tank is further provided, further comprising a base member having extendable legs.
The controller controls expansion and contraction of the leg;
The collector is provided with a guide portion protruding upward at the upper end portion, and receives the dehydrated cake discharged from the bottom portion with the lower end of the bottom portion located inside the guide portion,
The controller extends the leg before controlling the transport mechanism so that the collector is directed to the lower part of the one storage tank, and the collector reaches the lower part of the one storage tank. 4. The dehydration equipment according to claim 3, wherein the leg portion is contracted after the dehydration.   The dehydration mechanism has a bag-like film body installed in the storage tank, and dehydrates the floc in the storage tank by exhausting air inside the film body, so that the outer surface of the film body The dehydration processing equipment according to claim 4, wherein the dewatering cake is formed on the inner surface of the film body, and air is sealed inside the film body to separate the dehydrated cake from the outer surface.

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