JP2014233717A - Filtration system and operational method of filtration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress obstruction in a liquid drain pipe by a simple structure.SOLUTION: A filtration system 100 includes: a vessel 112; a filter unit 140 provided in the vessel; a port 120 for introducing liquid to be processed, being an opening provided at the vessel, for introducing the liquid to be processed (solid-liquid mixing liquid SL) into the vessel; a filtrate delivery port (a second outlet 150b) being an opening provided at the vessel, for delivering, to the outside of the vessel, filtrate FL being liquid having been filtered by the filter unit; a solid residue discharge port being an opening provided below the port for introducing liquid to be processed, in the vessel, for discharging, to the outside of the vessel, solid residue generated by the filtration; a discharge valve 162 for opening/closing the solid residue discharge port; a liquid drain pipe 170 having an opening located near the discharge valve in the vessel, for discharging, to the outside of the vessel, liquid residue generated by the filtration; and a liquid introduction part (a pump 104) for cleaning the liquid drain pipe by introducing liquid into the liquid drain pipe and making the liquid flow backward.

Description

  The present invention relates to a filtration system that filters a solid-liquid mixture using a filter, and a method for operating the filtration system.

  Conventionally, various filtration devices are used to filter a solid-liquid mixture. Among the filtration devices, for example, candle-type filtration devices (for example, Patent Documents 1 and 2) are provided in a vessel (container) into which a solid-liquid mixed liquid is introduced, the vessel is formed with an opening at one end, A plurality of filter units having a filtration function with a cylindrical shape whose longitudinal direction is arranged in the vertical direction and a plurality of filter units which are arranged in the horizontal direction in the longitudinal direction and communicated with the plurality of filter units. The filtrate filtered by the filter unit is removed from the vessel. And a plurality of register pipes to be sent out. Therefore, the plurality of filter units are suspended in the vessel by one register pipe so that the axial direction is the vertical direction.

  When filtering a solid-liquid mixed solution using a candle type filtration device, the solid-liquid mixed solution is press-fitted into a vessel. Then, the liquid moves from the outside to the inside of the filter unit, and the solid remains on the outer surface of the filter unit, so that the solid-liquid mixed solution is filtered (solid-liquid separation). And the liquid (filtrate) filtered by the filter unit is sent out of the vessel through the register pipe.

  When the filtration is completed, the filtration device is washed (washing process) to prepare for the next filtration process. Specifically, in the cleaning process, first, the remaining liquid is discharged out of the vessel through a drainage pipe provided at the lower portion of the vessel. Subsequently, by sending a gas or liquid from the register pipe toward the filter unit, the solid residue is desorbed from the outer surface of the filter unit, and the discharge valve provided at the bottom of the vessel is opened and desorbed. The solid residue is discharged out of the vessel, and the cleaning process is completed. Thereafter, the discharge valve is closed, and in preparation for the next filtration, a pretreatment for starting the introduction of the solid-liquid mixture into the vessel is performed.

JP 59-76512 A Japanese Unexamined Patent Publication No. 2011-67731

  As described above, in the cleaning process, the discharge valve provided at the bottom of the vessel is opened to discharge the desorbed solid residue to the outside of the vessel, but the solid residue adheres to the discharge valve and enters the vessel. May remain. If the solid residue remains in the vessel, the drainage pipe may be blocked by the solid residue.

  More specifically, when performing the cleaning process of the filtration device, in order to reduce the amount of liquid remaining in the vessel as much as possible, the opening of the drainage pipe disposed in the vessel is closed. Let's face it. Therefore, when the remaining liquid is discharged through the drainage pipe, the solid residue adhering to the discharge valve in the previous cleaning step flows into the drainage pipe together with the liquid, and the drainage pipe is blocked by the solid residue that has flowed in. End up.

  When the drainage pipe is blocked, the drainage pipe must be removed from the vessel and washed, which forces the operator to perform complicated work.

  Accordingly, an object of the present invention is to provide a filtration system capable of suppressing clogging of a drainage pipe with a simple configuration, and an operation method of the filtration system.

  In order to solve the above-described problems, a filtration system according to the present invention includes a vessel, a filter unit provided in the vessel, and an opening provided in the vessel, and a liquid to be treated is introduced into the vessel. An inlet, an opening provided in the vessel, a filtrate outlet for sending out the filtrate filtered by the filter unit to the outside of the vessel, and an opening provided below the processing target liquid inlet in the vessel A solid residue discharge port for discharging the solid residue generated by filtration to the outside of the vessel, a discharge valve for opening and closing the solid residue discharge port, and an opening located near the discharge valve in the vessel, and the liquid generated by filtration A drainage pipe for discharging the residue to the outside of the vessel, and a liquid introduction part for cleaning the drainage pipe by introducing a liquid back into the drainage pipe and flowing back.

  Further, the liquid introduction unit may introduce the liquid to be processed into the drainage pipe as a liquid.

  In order to solve the above-described problems, a method of operating a filtration system according to the present invention includes a step of introducing a liquid to be treated into a vessel from a liquid treatment inlet provided in the vessel constituting the filtration system, and a liquid introduction The liquid to be treated is further introduced from the mouth, the liquid to be treated is filtered by a filter unit provided in the vessel, and the filtrate, which is the filtered liquid, is sent out of the vessel through the filtrate outlet provided in the vessel. The liquid residue generated by the filtration is discharged out of the vessel through a drainage pipe having an opening located in the vicinity of the discharge valve that opens and closes the solid residue discharge port provided in the vessel and below the process liquid inlet in the vessel. A step of discharging the solid residue generated by the filtration through the solid residue discharge port, and a liquid unit or a gas in the filter unit through the filtrate outlet. Alternatively, the filter unit is cleaned by reversing both, and the process of introducing the liquid to be processed into the vessel is performed following the process of cleaning to introduce the liquid to be processed into the vessel. In any one or both of the process and the cleaning process, the liquid is introduced into the drainage pipe and backflowed.

  According to the present invention, it is possible to suppress blockage of the drainage pipe with a simple configuration.

It is a figure for demonstrating the rough connection relation of a filtration system. It is a figure for demonstrating a filtration apparatus. It is the schematic of the vertical cross section (YZ cross section) in the III-III line of FIG. FIG. 4 is a horizontal cross section (XY cross section) taken along line IV-IV in FIG. 2. It is a figure for demonstrating a filter unit and a register pipe. It is a figure for demonstrating attachment to the register pipe of a filter unit. It is a figure for demonstrating the flow of a process of the solid-liquid separation method using a filtration system. It is a figure which shows the open / close state of the valve | bulb, the open / close state of a discharge valve, and the drive state of a pump in each process of the solid-liquid separation method using a filtration system.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Filtration system 100)
FIG. 1 is a diagram for explaining a schematic connection relationship of the filtration system 100. As shown in FIG. 1, the filtration system 100 includes a stock solution tank 102, a pump 104, a filtration device 110, a filtrate tank 106, and valves 108a to 108i.

  The stock solution tank 102 is a tank for storing a solid-liquid mixed liquid SL (liquid to be processed). The pump 104 sends the solid-liquid mixed liquid SL stored in the stock solution tank 102 to the filtration device 110. The filtration device 110 performs solid-liquid separation (filtration) on the solid-liquid mixed liquid SL to generate a filtrate FL and a solid residue SR. The filtrate tank 106 is a tank for storing the filtrate FL generated by the filtration device 110.

  The valves 108a to 108i are controlled by a control unit (not shown). The control unit is composed of a semiconductor integrated circuit including a CPU (Central Processing Unit), reads programs and parameters for operating the CPU itself from the ROM, and cooperates with the RAM as a work area and other electronic circuits. Manage and control the entire filtration system 100.

  More specifically, the valve 108a is provided in a piping line L1 that connects the pump 104 and the liquid inlet 120 to be processed formed in the vessel 112 of the filtration device 110. The valve 108 b is provided in a piping line L 2 that is branched from the piping line L 1 and connected to the drainage piping 170 provided in the vessel 112. The valve 108c is provided in the piping line L3 branched from the downstream side of the valve 108b in the piping line L2.

The valve 108d is provided in a piping line L4 that connects the circulation port 130 formed in the vessel 112 and the stock solution tank 102. The valve 108e is provided in a piping line L5 that connects a compressed gas (for example, compressed nitrogen N ₂ ) supply source and the circulation port 130.

  The valve 108 f is provided in a piping line L 6 that connects the first outlet 150 a of the register pipe 150 provided in the filtration device 110 and the stock solution tank 102. The piping line L7 is a piping that connects the second outlet 150b of the register pipe 150 and a piping line L8 that connects the compressed gas supply source and the filtrate tank 106.

  The valve 108g is provided on the downstream side of the connection point of the piping line L7 in the piping line L8 connecting the compressed gas supply source and the filtrate tank 106. The valve 108h is provided on the upstream side of the connection point of the piping line L7 in the piping line L8. The pipe line L9 is a pipe branched from the connection point of the pipe line L7 and the valve 108h in the pipe line L8, and connects the pipe line L8 and the cleaning liquid supply source. The valve 108i is provided in the piping line L9.

(Filtering device 110)
Next, a specific configuration of the filtration device 110 will be described. 2 is a view for explaining a filtration device 110 constituting the filtration system 100, FIG. 3 is a schematic view of a vertical section (YZ section) taken along line III-III in FIG. 2, and FIG. FIG. 4 is a horizontal cross section (XY cross section) taken along line IV-IV in FIG. 2. 2 to 4 of the present embodiment, the X axis (horizontal direction), the Y axis (horizontal direction), and the Z axis (vertical direction) that intersect perpendicularly are defined as illustrated.

  As shown in these drawings, the filtration device 110 includes a vessel 112, a liquid inlet 120, a flow port 130, a filter unit 140, a register pipe 150, a solid residue discharge port 160, and a discharge valve 162. And a drainage pipe 170.

  The vessel 112 is a container made of metal, and a solid-liquid mixed solution SL (liquid to be processed) is introduced into the vessel 112. In the present embodiment, the inner surface of the vessel 112 is subjected to lining processing such as rubber or fluororesin.

  The liquid inlet 120 to be processed is an opening provided in the lower part of the vessel 112 (below the filter unit 140), and is an opening for introducing the solid-liquid mixed liquid SL into the vessel 112. In the present embodiment, a pump 104 (see FIG. 1) is connected to the liquid inlet 120 to be processed, and the solid liquid mixture SL is introduced into the vessel 112 by driving the pump 104. Become.

The circulation port 130 is an opening provided above the processing target liquid introduction port 120 in the vessel 112 and above the filter unit 140, and is a solid-liquid mixed liquid SL or gas (for example, nitrogen N ₂ ). Is opened to the outside of the vessel 112 and compressed gas (for example, compressed nitrogen N ₂ ) is introduced into the vessel 112. In the present embodiment, a compressed gas supply source (see FIG. 1) is connected to the circulation port 130, and the compressed gas is introduced into the vessel 112 by opening the valve 108 e.

  A plurality of filter units 140 are provided in the vessel 112 such that the axial direction (longitudinal direction) is arranged in the vertical direction (Z-axis direction in FIGS. 2 to 4), and includes a filter having a filtering function. It is a unit composed of A specific configuration of the filter unit 140 will be described in detail later.

  A plurality of register pipes 150 are provided in the vessel 112 such that the longitudinal direction is arranged in the horizontal direction (the Y-axis direction in FIGS. 2 to 4), and a plurality of filter units 140 are connected to the outside of the filter unit 140. When the liquid is pressed inward from the inside, the liquid (filtrate FL) filtered by the filter unit 140 is introduced through the communication port 152a, and the introduced filtrate FL is sent to the filtrate tank 106 (see FIG. 1). It is a tube to do. Referring back to FIG. 1, the register pipe 150 has a first outlet 150a for discharging the gas and liquid in the vessel 112, and an outlet different from the first outlet 150a, mainly the filtrate FL. Is provided with a second outlet 150b (filtrate outlet).

  2 to 4, a single register pipe 150 includes a plurality of (in this case, two, six, eight, ten, or twelve) filter units 140 each having a shaft. It is suspended and connected so that the center direction is along the vertical direction. The register pipe 150 connects the filter units 140 so that the plurality of filter units 140 are arranged in a grid pattern on a horizontal plane (XY plane in FIGS. 2 to 4).

  5A and 5B are diagrams for explaining the filter unit 140 and the register pipe 150. FIG. 5A is a perspective view of the filter unit 140 and the register pipe 150, and FIG. 5B is a perspective view of the filter unit 140. 5C is a vertical sectional view of the upper member 250, and FIG. 5D is a vertical sectional view of the lower member 260. As shown in FIGS. 5A and 5B, the filter unit 140 includes a candle unit 210 and a filter 220.

  The candle unit 210 includes an upper member 250, a lower member 260, and a candle body 270.

  The upper member 250 has an opening 252 that communicates with a communication port 152 a formed in the communication pipe 152 of the register pipe 150. The upper member 250 is provided with a pin hole 250 a for connecting the candle unit 210 to the register pipe 150. The lower member 260 is a member that forms the bottom of the filter unit 140, and is a bottomed cylindrical member. The upper member 250 and the lower member 260 are made of, for example, a resin such as polypropylene or a metal such as stainless steel.

  As shown in FIG. 5B, the candle body 270 includes a riser pipe 272 and a candle piece 274, one end is connected to the upper member 250, and the other end is the lower member 260. Connected to. The riser pipe 272 is a member having a cylindrical shape, and a plurality (six in this case) of candle pieces 274 are attached to the outer wall of the riser pipe 272. The candle piece 274 is a member having a cylindrical shape, and is provided with a plurality of slits 274a.

  The filter 220 is a filter cloth having a cylindrical shape, and is arranged on the outer periphery of the candle unit 210.

  Here, attachment of the filter unit 140 to the register pipe 150 will be described. FIG. 6 is a view for explaining the attachment of the filter unit 140 to the register pipe 150.

  As shown in FIG. 6A, first, the positions of the pin hole 152b provided in the communication pipe 152 of the register pipe 150 and the pin hole 250a provided in the upper member 250 of the candle unit 210 are aligned, The pins 154 are inserted into the 152b and 250a, and the candle unit 210 is suspended from the register pipe 150.

  Then, as shown in FIG. 6B, the outer periphery of the candle unit 210 and the communication pipe 152 of the register pipe 150 are covered with a cylindrical filter 220, the position corresponding to the communication pipe 152 in the filter 220, and the filter 220. The hose band 156 is wound around and fixed to a position corresponding to the lower member 260 in FIG. In this way, the filter unit 140 is firmly attached to the register pipe 150 by fixing the hose band 156 at two locations (a position corresponding to the communication pipe 152 in the filter 220 and a position corresponding to the lower member 260 in the filter 220). Can do. Therefore, even if washing (back washing) is performed from the inside of the filter unit 140 to the outside of the filter unit 140, the frequency at which the filter unit 140 is detached from the register pipe 150 can be reduced. Therefore, the frequency | count of washing | cleaning can be increased and clogging of the filter 220 can be suppressed, that is, the lifetime of the filter 220 can be extended.

  In the present embodiment, cushion materials 158 are interposed between the communication tube 152 and the filter 220, between the lower member 260 and the filter 220, and between the filter 220 and the hose band 156. Thereby, the candle unit 210 and the filter 220 and the filter 220 and the communication pipe 152 can be brought into close contact with each other.

  In this way, the filter unit 140 is attached to the register pipe 150. Then, when the solid-liquid mixed liquid SL is press-fitted into the vessel 112 through the processing liquid introduction port 120, the solid-liquid mixed liquid SL is filtered (solid-liquid separation) by the filter 220 as shown in FIG. 5B. Then, the solid residue SR (cake) remains on the outer surface of the filter 220, and the filtrate FL flows into the candle piece 274 through the slit 274a. Then, the filtrate FL that has flowed into the candle piece 274 flows downward in the candle piece 274, collects in the riser pipe 272, is pushed upward, and is collected in the register pipe 150.

  Referring back to FIGS. 2 and 3, the solid residue discharge port 160 is an opening provided below the processing target liquid introduction port 120 in the vessel 112 and below the filter unit 140, and is a solid generated by filtration. This is an opening for discharging the residue SR out of the vessel 112. The discharge valve 162 is an open / close valve that opens and closes the solid residue discharge port 160.

  The drainage pipe 170 has an opening 170a located in the vicinity of the discharge valve 162 in the vessel 112 (in the vicinity of the discharge valve 162 when in the closed state), and discharges the liquid residue LR generated by the filtration to the outside of the vessel 112. This is the piping. In other words, the drainage pipe 170 is provided in the vessel 112 so that the opening 170a faces the discharge valve 162 when the discharge valve 162 is closed.

  Subsequently, a solid-liquid separation method of the solid-liquid mixed liquid SL using the filtration system 100 will be described. FIG. 7 is a diagram for explaining the processing flow of the solid-liquid separation method using the filtration system 100. FIG. 8 is a diagram illustrating the valves 108a to 108i in each step of the solid-liquid separation method using the filtration system 100. It is a figure which shows the open / close state, the open / close state of the discharge valve 162, and the drive state of the pump 104. In FIG. 8, the open state of the valves 108a to 108i, the open state of the discharge valve 162, and the case where the pump 104 is driven are indicated by “◯”, the closed state of the valves 108a to 108i, and the closed state of the discharge valve 162. The case where the pump 104 is stopped is indicated by “x”.

  The solid-liquid separation method using the filtration system 100 includes a charging step S310 (FIG. 7A), a circulation step S312 (FIG. 7B), a filtration step S314 (FIG. 7C), and a draining step S316. (FIG. 7 (d)), blow step S318 (FIG. 7 (e)), drainage step S320 (FIG. 7 (f)), pressure relief step S322 (FIG. 7 (g)), solid residue discharge step S324 (FIG. 7 (h)), backwashing step S326 (FIG. 7 (i)), and back blow step S328 (FIG. 7 (j)). Hereafter, each process is demonstrated with reference to FIG.1, FIG.7, FIG.8. In the initial state, the valve 108d (flow port) is open, and the valves 108a to 108c, 108e to 108i, and the discharge valve 162 are all closed.

(Liquid filling step S310)
First, the control unit opens the valve 108a (processed liquid inlet 120), the valve 108b (drainage pipe 170), and the valve 108f (first outlet 150a of the register pipe 150). Then, the pump 104 is driven and, as shown in FIG. 7A, the solid-liquid mixed liquid SL (shown by cross-hatching in FIG. 7) enters the vessel 112 through the liquid inlet 120 as shown in FIG. And the vessel 112 is filled with the solid-liquid mixture SL. Here, since the valve 108 b is opened, the pump 104 functions as a liquid introduction unit, and the solid-liquid mixed solution SL is caused to flow backward through the drainage pipe 170 to introduce the solid-liquid mixed solution SL into the vessel 112. .

  In addition, since the valves 108d and 108f are opened, the air in the vessel 112 is pushed out from the flow port 130 and the first outlet 150a of the register pipe 150 by introducing the solid-liquid mixture SL into the vessel 112. Will be. The filtrate FL filtered by the filter 220 is introduced into the filter 220 in the filter unit 140 and sent to the register pipe 150.

(Circulation step S312)
Next, the control unit maintains the driving of the pump 104 and continues the introduction of the solid-liquid mixed liquid SL into the vessel 112 through the liquid inlet 120 and the drainage pipe 170. In this way, as shown in FIG. 7B, the filtrate FL (shown by hatching in FIG. 7) sent from the first outlet 150a of the register pipe 150 is returned to the stock solution tank 102, and the filtrate FL The solid-liquid mixture SL is circulated until becomes clear. Here, the solid-liquid mixture SL is caused to overflow at the circulation port 130 so that the solid residue SR separated by the filter 220 does not settle. The solid-liquid mixed liquid SL overflowed through the circulation port 130 is returned to the stock solution tank 102.

(Filtering step S314)
Subsequently, the control unit maintains driving of the pump 104 and closes the valve 108f while continuing to introduce the solid-liquid mixed liquid SL into the vessel 112 through the liquid inlet 120 and the drainage pipe 170. Then, the valve 108g is opened. Then, as shown in FIG. 7 (c), the solid-liquid mixed solution SL is press-fitted from the liquid inlet 120 to be processed, and the filtrate FL (shown by hatching in FIG. 7) from the second outlet 150b of the register pipe 150. Is sent to the filtrate tank 106, and a solid residue SR (shown in black in FIG. 7) remains on the outer surface of the filter unit 140.

(Draining step S316)
When the filtration step S314 ends, the control unit stops driving the pump 104, closes the valves 108a, 108b, 108d, and 108g, and opens the valves 108c, 108e, and 108f. In this way, as shown in FIG. 7D, compressed gas (for example, compressed nitrogen N ₂ ) is caused to flow back into the vessel 112 from the flow port 130, and the inside of the vessel 112 is brought into a pressurized state. Then, the solid-liquid mixed liquid SL remaining in the vessel 112 is discharged to the outside through the drainage pipe 170, and the filtrate FL and gas (nitrogen N ₂ ) are released from the first outlet 150a of the register pipe 150. Become. As a result, the solid-liquid mixture SL is discharged from the vessel 112. Note that the valve 108a may be opened only in the initial stage of the liquid draining step S316. Further, the solid-liquid mixed liquid SL and the filtrate FL discharged to the outside of the vessel 112 are returned to the stock solution tank 102.

(Blow process S318)
Subsequently, the control unit closes the valve 108c (drainage pipe 170). In this way, as shown in FIG. 7 (e), the solid residue SR remaining on the filter unit 140 can be dehydrated by the compressed gas introduced from the flow port 130. Further, the blow process S318 is sequentially performed for each register pipe 150.

(Drain removal step S320)
Then, the control unit opens the valve 108c. In this manner, as shown in FIG. 7 (f), the solid-liquid mixed liquid SL remaining in the vessel 112 is discharged out of the vessel 112 through the drainage pipe 170 by the compressed gas introduced from the circulation port 130. can do. Note that the solid-liquid mixed liquid SL discharged to the outside of the vessel 112 is returned to the stock solution tank 102.

(Exhaust pressure step S322)
When the draining step S320 is completed, the control unit closes the valves 108c and 108e and opens the valve 108d. As a result, as shown in FIG. 7 (g), the nitrogen in the vessel 112 can be discharged through the circulation port 130 and the first outlet 150a of the register pipe 150, and the inside of the vessel 112 is made equal to the atmospheric pressure and discharged. Safety when opening the valve 162 can be ensured.

(Solid residue discharging step S324)
Subsequently, the control unit closes the valve 108f and opens the valve 108h and the discharge valve 162. In this way, as shown in FIG. 7 (h), the compressed gas (for example, compressed nitrogen N ₂ ) is back blown (returned back) from the second outlet 150b of the register pipe 150. Thereby, the solid residue SR can be detached from the filter unit 140 and discharged out of the vessel 112 from the solid residue discharge port 160. Note that nitrogen N ₂ is discharged from the circulation port 130.

(Backwash process S326)
When the solid residue discharge step S324 ends, the control unit closes the valve 108h and the discharge valve 162, and opens the valve 108i. In this way, as shown in FIG. 7 (i), the cleaning liquid WS is introduced from the second outlet 150 b of the register pipe 150. Thereby, the backwashing (cleaning) of the filter 220 of the filter unit 140 can be performed. Note that nitrogen N ₂ is discharged from the circulation port 130.

(Back blow process S328)
Subsequently, the control unit closes the valve 108i and opens the valve 108h. In this way, as shown in FIG. 7J, compressed gas (for example, compressed nitrogen N ₂ ) is introduced from the second outlet 150b of the register pipe 150. Thereby, the backwashing (cleaning) of the filter 220 of the filter unit 140 can be performed. Further, the backwashing step S326 and the back blow step S328 are sequentially performed for each register pipe 150.

  Then, the control unit opens the valve 108c and discharges the cleaning liquid WS to the outside of the vessel 112, and the series of steps of the solid-liquid separation method ends.

  As described above, according to the filtration system 100 according to the present embodiment, the solid-liquid mixed solution SL is caused to flow backward to the drainage pipe 170 in the charging step S310, the circulation step S312 and the filtration step S314. As a result, when the solid residue SR adheres to the discharge valve 162 and the cleaning liquid WS is discharged out of the vessel 112 in the solid residue discharge step S324 performed in the previous solid-liquid separation process of the solid-liquid separation process, the discharge is performed. Even if the liquid pipe 170 is blocked by the solid residue SR, the drainage pipe 170 can be washed by the back flow of the solid-liquid mixed liquid SL, and the blockage can be released.

  Therefore, even if the drainage pipe 170 is blocked, the work of removing the drainage pipe 170 as in the prior art can be omitted.

  Further, the configuration in which the solid-liquid mixed liquid SL is caused to flow back to the drainage pipe 170 does not require the use of a dedicated liquid for releasing the blockage of the drainage pipe 170, and the cost required for the liquid for releasing the blockage is reduced. It becomes possible to reduce.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  For example, in the above-described embodiment, the configuration in which the liquid inlet 120 to be processed is disposed below the vessel 112 is described, but the position of the liquid inlet 120 is not limited. Similarly, the configuration in which the circulation port 130 is disposed above the liquid inlet 120 to be treated has been described, but the position of the circulation port 130 is not limited.

  Moreover, although the said embodiment demonstrated the structure which reversely flows the solid-liquid mixed liquid SL to the drainage piping 170 in all of the charging process S310, the circulation process S312 and the filtration process S314, the charging process S310, the circulation process S312, In one or two steps selected from the group of the filtration step S314, the solid-liquid mixed solution SL may be caused to flow backward through the drainage pipe 170. Further, in one or a plurality of processes selected from the group of the blow process S318, the backwash process S326, and the back blow process S328, the solid-liquid mixed liquid SL can be caused to flow back to the drainage pipe 170.

  Moreover, in the said embodiment, although the structure which reversely flows the solid-liquid mixed liquid SL to the drainage piping 170 was demonstrated, in the backwashing process S326 and back blow process S328, when liquid is backflowed to the draining pipe 170, liquid draining is carried out. The liquid that flows back to the pipe 170 is not limited to the solid-liquid mixed liquid SL, but may be the cleaning liquid WS.

  Moreover, in the said embodiment, although the structure by which lining processing is given to the inner surface of the vessel 112 was demonstrated, when the to-be-processed liquid is not corrosive, it does not need to give lining processing.

  Moreover, in the said embodiment, although the candle piece 274 demonstrated the structure provided with the some slit 274a, it is good also as a round hole etc. instead of the slit 274a.

  INDUSTRIAL APPLICABILITY The present invention can be used for a filtration system that separates a solid-liquid mixture using a filter and a method for operating the filtration system.

100 Filtration system 104 Pump (liquid introduction part)
112 Vessel 120 Processed liquid inlet 140 Filter unit 150b Second outlet (filtrate outlet)
160 Solid residue discharge port 162 Discharge valve 170 Drainage pipe 170a Opening S310 Filling step S314 Filtration step S316 Drainage step S324 Solid residue discharge step S326 Backwash step S328 Back blow step

Claims (3)

With vessel,
A filter unit provided in the vessel;
An opening provided in the vessel, and a liquid inlet for introducing a liquid to be processed into the vessel;
An opening provided in the vessel, and a filtrate delivery port for delivering a filtrate, which is a liquid filtered by the filter unit, to the outside of the vessel;
A solid residue discharge port for discharging the solid residue generated by the filtration to the outside of the vessel, which is an opening provided below the liquid inlet in the vessel.
A discharge valve for opening and closing the solid residue discharge port;
An opening is located in the vicinity of the discharge valve in the vessel, and a drainage pipe for discharging the liquid residue generated by the filtration out of the vessel;
A liquid introduction part for cleaning the drainage pipe by introducing a liquid into the drainage pipe and causing the liquid to flow backward;
A filtration system comprising:   The filtration system according to claim 1, wherein the liquid introduction unit introduces the liquid to be treated as the liquid into the drainage pipe. A method of operating a filtration system,
Introducing the liquid to be processed into the vessel from the liquid inlet to be processed provided in the vessel constituting the filtration system;
The treatment liquid is further introduced from the treatment liquid introduction port, the treatment liquid is filtered with a filter unit provided in the vessel, and a filtrate that is a filtered liquid is provided in the vessel. Sending out the vessel through the filtrate outlet;
The liquid residue generated by the filtration is discharged to the outside of the vessel through a drainage pipe having an opening in the vicinity of a discharge valve that opens and closes a solid residue discharge port provided below the treatment liquid introduction port in the vessel. And a process of
Discharging the solid residue generated by the filtration through the solid residue discharge port;
Washing the filter unit by causing one or both of liquid and gas to flow backward through the filtrate outlet through the filter unit;
Have
Subsequent to the cleaning step, performing a step of introducing a liquid to be processed into the vessel,
A method for operating a filtration system, wherein a liquid is introduced into the drainage pipe and backflowed in one or both of the step of introducing the liquid to be treated into the vessel and the step of washing.

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