JP6000049B2 - Solid-liquid separator - Google Patents

Description

  The present invention includes, for example, sludge solids contained in liquids, particularly suspensions generated in wastewater treatment facilities including sludge such as sewage treatment plants, human waste treatment plants, livestock agriculture, food manufacturing industries, and chemical industries. The present invention relates to an apparatus for separately taking out a solid content and a liquid content from which a turbid solid (SS) is separated.

  Currently, wastewater containing sludge generated in wastewater treatment plants such as sewage treatment plants, human waste treatment plants, livestock farming, food manufacturing industries, and chemical industries, ie suspended sewage, can be drained as it is due to environmental damage. What cannot be done is a well-known thing, and it has become a subject to process in the state which removed the suspended solid (SS) contained in suspended sewage as much as possible.

  To that end, the processing chamber is a container that stores the processing liquid in the storage space and discharges the dewatered sludge from the sludge outlet, and a plurality of filter bodies that are arranged adjacent to each other in parallel in the longitudinal direction below the storage space. A plurality of sets of filter pieces and spacers arranged alternately in a stack in the longitudinal direction through the rotation shaft, The filter piece of the filter body includes a normal filter piece in which a part of the filter piece is adjacent to the gap formed by the filter piece of the other filter body and the spacer, and a plurality of the filter pieces are disks. The spacer is divided into a small-diameter filter piece that is a disc having an outer diameter smaller than that of a normal filter piece, and the plurality of spacers are divided into a regular spacer of Kikuza type and a large-diameter spacer that is a disc having an outer diameter larger than that of the normal spacer. The normal filter of the other filter body adjacent to the outer edge of the normal filter piece of the filter body. A filtrate discharge gap that faces the outer edge of the filter, the outer edge of the small-diameter filter piece of the filter body faces the outer edge of the large spacer of the other filter body adjacent to the filter body, and allows the filtrate to pass in the longitudinal direction of the rotating shaft. An apparatus for filtering a suspension, which is a closed hole provided in a piece and a spacer and in which a filtrate discharge gap provided in the large-diameter spacer is not connected to an outer edge, is known (for example, see Patent Document 1).

  Further, as another background art, in order to wipe out the problem of the apparatus for filtering a suspension described in the above-mentioned known patent document 1, a filter body constituted by multiplely fitting discs on a rotatable shaft body In a multiple disk dewatering apparatus comprising a filter body group in which a required number is continuously provided so that a part of the disk is superposed and filtered from a gap between the disk bodies of the filter body, the filter body group For example, the cake conveyance path is configured so that the cake conveyance path formed by the above process is a closed space, and the agglomerated stock solution in which solids are aggregated is pumped to the cake conveyance path, and the pressure in the cake conveyance path is set to a predetermined pressure value. The upstream end of the path is formed in a closed space by the filter body, or the upper and downstream ends of the cake conveying path are formed in a closed space communicating with the respective openings formed in the upper and downstream walls, In addition, the upper part of the cake conveying path is sealed with a ceiling plate instead of the upper filter body group. In addition to the formation of each closed space, a discharge resistance applying means is provided in the opening at the downstream end of the cake conveying path, or a sealed flocculation tank for storing the flocculated undiluted solution is provided. Then, a pressure gauge for detecting the pressure of the stock solution supply path including the cake transport path is provided, and the agglomerated stock solution is pumped so that the detected pressure becomes a predetermined value. Devices for filtering suspensions configured to maintain are known (see, for example, Patent Document 2).

JP 2005-007327 A JP 2007-000806 A

  However, in the apparatus for filtering the suspension of Patent Document 1, the filtrate separating action at the upstream portion of the cake conveying path of the lower filter train is liquid separation by gravity because there is no opposing upper filter train. Therefore, the eyes through which the filtrate passes are only gaps formed in the portion where adjacent filter bodies are polymerized, and the filtration area formed in the lower filter body row is small, so that an effective filtration action is obtained. If the cake is difficult to be dehydrated and sufficient dehydration does not proceed in the gravity dewatering section upstream of the cake conveying path of the lower filter row, the cake has entered the pressing dewatering portion formed between the upper and lower opposed filter rows. In addition to not being able to obtain an effective squeezing action with a large moisture content, if the dehydration action in the gravity dehydration part is small, the liquid level to be treated is slow and the supply amount of the undiluted solution is restricted. , The increase in throughput is not expected There is a drawback.

  Further, in order to dispel the problems of the apparatus for filtering the suspension described in Patent Document 1, the apparatus for filtering the suspension of Patent Document 2 uses the cake transport path as a closed space to transport the cake. In order to pump the agglomerated stock solution in which the solid content is aggregated in the path and to set the pressure in the cake transport path to a predetermined pressure value, the aggregate stock solution supplied from the opening at the downstream end of the cake transport path is directly In order not to flow out, it takes time for a preparatory operation for filling a certain amount of the pressed cake in the pressed dewatering part in the downstream part of the cake transport path, and when the pressure in the cake transport path is too high, Since a large amount of the coagulated stock solution pumped and fed from the gravity dehydration part of the flow part is leaked, on the contrary, in addition to causing a reduction in the recovery rate of the solid matter discharged from the downstream end opening part, Clogging is promoted As a result, the processing function of the squeezing and dehydrating part is reduced, and the moisture content of the squeezed cake is greatly deteriorated, so that the solid matter recovery rate discharged from the downstream end opening is further reduced, and eventually the When the pressure in the cake transport path exceeds the limit, the plug-shaped press cake filled in the press dewatering section is collapsed and discharged at once from the downstream end opening, thereby the internal pressure of the cake transport path The aggregation stock solution supplied from the opening at the downstream end is directly discharged and the solid-liquid separation function is lost, so that the preparatory operation must be performed again, and the structure is as described above. In addition to being complicated, the rotating part and the stationary part must be brought close to or in contact with each other accurately and accurately, so that it is inevitably difficult to assemble and expensive, and maintenance that requires disassembly and assembly is required. There has been a drawback that also inferior.

  Therefore, in view of the above-mentioned problems, the present invention applies a sufficient water depth pressure to the gravity dehydration part upstream of the cake transport path of the lower filter body group, so that the first stage treatment of the gravity dehydration part is sufficiently solid-liquid. The separated and concentrated treatment liquid is efficiently squeezed by the pressure dewatering section formed between the upper and lower opposing filter body groups in the subsequent treatment, and the supply amount of the feed stock solution is not limited, and the stable treatment amount can be increased. In addition, the filtration surface of the laminated rotary filter body is not clogged, the preparatory operation is not required, and the simple structure does not require time and skill for assembly, and is inexpensive and maintenance. An object of the present invention is to provide a solid-liquid separation apparatus that is excellent in performance and can stably maintain a filtration function.

  A plurality of filter pieces having different diameters, which are rotationally driven by a rotating shaft, are stacked between a stock solution supply port and a solid content discharge port in a processing tank having a stock solution supply port, a solid content discharge port, and a filtrate content discharge port. The upper and lower shields suspended from the upper wall of the processing tank are formed by ascending the stacked rotary filter bodies in the upper and lower two steps at equal intervals in the upward and downward gradient in the solid content discharge port. When the movable part of the wall receives the liquid pressure of the supply stock solution, the outer edge of the main part at the lower end of the movable part is brought into sliding contact with the outer peripheral edge of the upper laminated rotary filter at the upstream end of the stock solution supply port side. An upper filtrate drainage port for the upper space is opened on the side wall of the processing tank in the upper space below the opening position of the solid content discharge port. And attached to the supply side wall of the treatment tank so as to efficiently collect the collected fine particles contained in the treatment liquid. The outer edge of the main part at the tip of the lower shielding wall is closely opposed to the outer peripheral edge of the lower laminated rotary filter at the starting end on the upstream side of the stock solution supply port with a slight gap, and is attached to the discharge side wall of the processing tank The outer periphery of the main portion of the cake is placed close to and opposed to the outer periphery of the upper and lower laminated rotary filter bodies at the downstream end of the solid content outlet side, with a slight gap therebetween, thereby arranging the cake transport path and the lower laminated rotary filter body The main feature is that it is configured to partition the lower space below and to open a lower filtrate drain for the lower space on the lower wall of the processing tank of the lower space.

  In the solid-liquid separation device according to claim 1 of the present invention, the invention according to claim 2 of the present invention forms a filtrate path communicating in the stacking direction in the upper and lower stacked rotary filter bodies, and sends the filtrate path The liquid terminal opening is electrically connected to the filtrate chamber provided outside the side wall of the processing tank, and is configured to open a filtrate chamber drain on the lower wall of the filtrate chamber.

Further, in the solid-liquid separator according to claim 1 or 2 of the present invention, the invention according to claim 3 of the present invention is to adjust the overflow position of the elbow that can be pivotally adjusted to the upper filtrate drainage port. By providing the tool, the overflow position adjusting function is added.

Furthermore, in the solid-liquid separator according to claim 1 or 2 , the invention according to claim 4 of the present invention is such that the opening position of the upper filtrate drainage port is opened in the movable part of the upper shielding wall. and, via the movable portion is moveable filtrate communication path to the lower shielding wall from the upper portion filtrate drain outlet, the upper filtrate water outlet to induce drainage of the filtrate of the upper space to the lower space configuration It is.

  According to the solid-liquid separation device of the first aspect of the present invention, when the stock solution is supplied into the processing tank, the movable part of the upper shielding wall of the present invention receives the liquid pressure of the supplied stock solution, The upper outer space above the raw liquid supply port side starting end and the upper laminated rotary filter array is formed by sliding the outer edge of the main part at the lower end of the movable part to the outer peripheral edge of the upper laminated rotary filter body at the upstream end of the raw liquid supply port side. As shown in FIGS. 1 and 3, the stock solution is supplied by the difference in water head caused by the water flow resistance of the stacking gaps of the filter pieces of the upper and lower layered rotary filter bodies of the filter mesh through which the filtrate passes as shown in FIGS. Since the liquid level in the lower part of the rotary filter body can be raised, sufficient water depth pressure is applied to the gravity dehydration part upstream of the cake transport path of the lower laminated rotary filter. The processing liquid that is solid-liquid separated and concentrated is arranged opposite to the upper and lower two stages of the subsequent processing. It is efficiently squeezed by the squeezing and dewatering part formed in the vacuum conveying path, the supply amount of the feed stock solution is not limited, a stable increase in throughput is maintained, and the filtration surface of the laminated rotary filter body is No clogging, no preparatory operation, simple structure, no time and skill for assembly, low cost, excellent maintainability, stable filtration function When the supply of the stock solution is stopped, the movable part that is automatically slidably contacted with the outer peripheral edge of the upper laminated rotary filter is separated from the outer peripheral edge of the upper laminated rotary filter, and the upper space section is released. The solid content accumulated in the upper space is automatically collected in the upstream portion of the cake conveyance path, and is compressed and discharged again at the next operation.

  Further, according to the solid-liquid separator according to the second aspect of the present invention based on the first aspect of the present invention, in the case of the laminated rotary filter body having the filtrate path, the laminated rotary filter body having the filtrate path is used. Since the drainage from the filtrate chamber drainage port on the lower wall of the filtrate chamber via the filtrate channel is added, the squeezing and dewatering part formed in the cake transport path is arranged very efficiently in the upper and lower two stages of the post-processing, and is squeezed very efficiently Thus, there are advantages that the filtrate separation function is improved and a filtered dehydrated cake having a low water content can be recovered.

According to the solid-liquid separator according to the third aspect of the present invention based on the first or second aspect of the present invention, the upper filtrate drainage outlet is provided with an elbow overflow position adjusting tool capable of rotating and adjusting its position. By using the overflow position adjustment function, the appropriate water depth pressure is applied to the gravity dehydration part upstream of the cake transport path of the lower layered rotary filter body according to the nature of the stock solution supplied, etc. It has the advantage that the first stage treatment of gravity dehydration of the gravity dehydration part appropriate for the situation can be easily performed.

According to the solid-liquid separator according to the fourth aspect of the present invention based on the first or second aspect of the present invention, the upper filtrate drainage port is not opened particularly on the side wall of the treatment tank in which no filtrate path is provided in the laminated rotary filter body. In the configuration, it is not necessary to open the upper filtrate drainage port on the side wall of the treatment tank, so it is inevitably necessary to install the upper filtrate drainage pipe outside the treatment tank, and only the lower filtrate drainage pipe can be used. Therefore, the apparatus of the present invention is easy to install and has the advantage that it can be installed compactly and inexpensively.

It is a longitudinal cross-sectional view of Example 1 of this invention. It is sectional drawing of the XX arrow direction of FIG. It is a longitudinal cross-sectional view of Example 2 of this invention. It is sectional drawing of the YY arrow direction of FIG. It is explanatory drawing for demonstrating the overflow position adjustment function of the upper filtrate drainage port of Example 3 of this invention. It is a longitudinal cross-sectional view of Example 4 of this invention. . It is sectional drawing of the ZZ line | wire arrow direction of FIG.

  Hereinafter, filter pieces of different diameters that are rotationally driven by a rotating shaft are provided between the stock solution supply port and the solid content discharge port in the treatment tank having the stock solution supply port, the solid content discharge port, and the filtrate content discharge port of the present invention. A plurality of layered rotary filter bodies formed in layers are arranged in the upper and lower two steps at equal intervals in a gradient ascending in the discharge direction of the solid discharge port to form a cake transport path, and suspended from the upper wall of the treatment tank The movable part of the upper shielding wall is subjected to the liquid pressure of the supply stock solution, and the outer edge of the main part of the lower part of the movable part is brought into sliding contact with the outer peripheral edge of the upper laminated rotary filter body at the upstream side of the stock solution supply port side, The raw solution supply port side start end portion and the upper space above the upper laminated rotary filter array are partitioned, and the upper filtrate for the upper space below the opening position of the solid content discharge port on the side wall of the processing tank of the upper space Establish a drain outlet and supply the treatment tank so that the collected fine particles contained in the treatment liquid can be collected efficiently. The outer edge of the main part of the lower shielding wall attached to the top is made to face the outer peripheral edge of the lower laminated rotary filter at the upstream end of the stock solution supply port side with a slight gap and attached to the discharge side wall of the treatment tank. The outer peripheral edge of the main part of the sealing member is made to face and oppose the outer periphery of the upper and lower laminated rotary filter body at the downstream end of the solid content outlet side with a slight gap therebetween, so that the cake conveying path and the lower laminated shape Implementation of the present invention as an embodiment configured to partition a lower space below the rotating filter array and to open a lower filtrate drain for the lower space on the lower wall of the processing tank of the lower space Although it demonstrates in detail based on an example with reference to drawings, this invention is not limited by the form of this Example.

  1 and 2, a stock solution supply port 10 for supplying a stock solution to the upper part of the treatment tank 9 is opened, and a lower filtrate drain port 12 b for draining the solid-liquid separated filtrate to the outside of the treatment tank 9 is opened at the lower part. In the downstream discharge portion of the processing tank 9, a solid content discharge port 11 for discharging and collecting the cake of the solid filtered and dehydrated solid separated from the processing tank 9 is provided. As shown in FIG. 2, the stock solution supply port 10 and the solid content discharge port 11 are supported by bearings 17 provided outside the front side wall 9f and the back side wall 9r of the treatment tank 9, and A plurality of laminated rotary filter bodies in which filter pieces having different diameters rotated by a rotary shaft 4 rotated by a drive transmission tool 16 (for example, a worm gear) provided outside the front side wall 9f are laminated. Ascend 1t toward the discharge direction of the solid content outlet 11 The cake conveying path 7 is formed by being arranged in two upper and lower stages at regular intervals, and the movable portion 19k of the upper shielding wall 19 suspended from the upper wall 9t of the processing tank 9 receives the liquid pressure of the supply stock solution. The main part outer edge of the lower end of the movable part 19k is brought into sliding contact with the outer peripheral edge of the upper laminated rotary filter 1t of the upstream raw liquid supply port side starting end 10f, thereby rotating the raw liquid supply port side starting end 10f and the upper laminated rotation. The upper space 21 above the filter body 1t array is partitioned, and an upper filtrate drain port 12r for the upper space 21 is opened on the side wall of the treatment tank 9 in the upper space 21 below the opening position of the solid content discharge port 11. The main outer edge of the lower shielding wall 18 attached to the supply side wall 9s of the processing tank is efficiently stacked with the lower portion of the upstream raw solution supply port side starting end 10f so as to efficiently recover the collected fine particles contained in the processing liquid. 1t on the outer periphery of the rotating filter body 1t At the same time, the outer edges of the main parts of the seal members 15 and 15 attached to the discharge side wall 9d of the treatment tank 9 are slightly placed on the outer periphery of the upper and lower laminated rotary filter bodies 1t and 1t on the downstream side of the solid content discharge port end 11e. The cake transport path 7 and the lower space 22 below the lower laminated rotary filter 1t array are partitioned by facing each other with a small gap, and the lower space 9b of the processing tank 9 of the lower space 22 is placed in the lower space 9b. 22 is configured to open a lower filtrate drain port 12b. For example, the laminated rotary filter body 1t is subjected to filtration by bringing a convex end face projecting from a convex disc-shaped filter piece 5 into contact therewith. While forming the groove, the large-diameter disk-shaped filter piece 2 is interposed in the filtration groove so as to be movable in the axial direction, and the small-diameter disk-shaped filter piece 3 is inserted in the axial direction between the next filtration grooves. Each filter piece having a different diameter is shaped like a convex disk so that it can rotate in synchronization with the rotary shaft 4 while being moved. The filter piece 5, the large-diameter disc-like filter piece 2, the convex disc-like filter piece 5, the small-diameter disc-like filter piece 3, and the convex disc-like filter piece 5 are sequentially inserted and laminated on the outer periphery of the rotary shaft 4. Now it is desirable to form.

  For example, referring to FIG. 3 and FIG. 4, based on the first embodiment, a filtrate path 6 communicating in the stacking direction is formed in the upper and lower laminated rotary filter bodies 1 t and 1 t, and the filtrate path 6 The liquid feed terminal opening is electrically connected to the filtrate chamber 13 attached to the outside of the rear side wall 9r of the treatment tank 9, and is configured to open the filtrate chamber drain port 14 on the lower wall of the filtrate chamber 13. Yes.

  Based on the first or second embodiment, for example, with reference to FIG. 5, the overflow position is adjusted to the outside of the upper filtrate drain 12 by an overflow position adjuster such as an elbow that can be pivotally adjusted. An adjustment function is added.

Based on the first or second embodiment, for example, with reference to FIGS. 6 and 7, the opening position of the upper filtrate drain port 12r is opened in the movable portion 19k of the upper shielding wall 19, and the upper filtrate drain port is formed. the movable portion 19k in the lower shield wall 18 via a moveable filtrate communicating passage 20 from 12r, the upper filtrate water discharge port 12r to induce drainage of the filtrate of the upper space 21 into the lower space 22 configuration Has been.

1t Laminated filter body 2 Large-diameter disk-like filter piece 3 Small-diameter disk-like filter piece 4 Rotating shaft 5 Convex disk-like filter piece 6 Filtrate path 7 Cake transport path 9 Treatment tank 9b Lower wall 9d Discharge side wall 9f Front Side wall 9r Rear side wall 9s Supply side wall 9t Upper wall 10 Stock solution supply port 10f Stock solution supply side start end 11 Solid content discharge port 11e Solid content discharge side end 12b Lower filtrate discharge port 12r Upper filtrate discharge port 13 Filtrate chamber 14 Filtrate chamber Drain port 15 Seal member 16 Drive transmission tool 17 Bearing 18 Lower shielding wall 19 Upper shielding wall 19k Movable part 20 Filtrate communication path 21 Upper space 22 Lower space

Claims (4)

  A plurality of filter pieces having different diameters, which are rotationally driven by a rotating shaft, are stacked between a stock solution supply port and a solid content discharge port in a processing tank having a stock solution supply port, a solid content discharge port, and a filtrate content discharge port. The upper and lower shields suspended from the upper wall of the processing tank are formed by ascending the stacked rotary filter bodies in the upper and lower two steps at equal intervals in the upward and downward gradient in the solid content discharge port. When the movable part of the wall receives the liquid pressure of the supply stock solution, the outer edge of the main part at the lower end of the movable part is brought into sliding contact with the outer peripheral edge of the upper laminated rotary filter at the upstream end of the stock solution supply port side. An upper filtrate drainage port for the upper space is opened on the side wall of the processing tank in the upper space below the opening position of the solid content discharge port. And attached to the supply side wall of the treatment tank so as to efficiently collect the collected fine particles contained in the treatment liquid. The outer edge of the main part at the tip of the lower shielding wall is closely opposed to the outer peripheral edge of the lower laminated rotary filter at the starting end on the upstream side of the stock solution supply port with a slight gap, and is attached to the discharge side wall of the processing tank The outer periphery of the main portion of the cake is placed close to and opposed to the outer periphery of the upper and lower laminated rotary filter bodies at the downstream end of the solid content outlet side, with a slight gap therebetween, thereby arranging the cake transport path and the lower laminated rotary filter body A solid-liquid separation device configured to partition a lower space below and to open a lower filtrate drain for a lower space on a lower wall of a processing tank of the lower space.   2. The solid-liquid separator according to claim 1, wherein a filtrate path communicating in the stacking direction is formed in the upper and lower laminated rotary filter bodies, and a liquid feed terminal opening of the filtrate path is formed on a side wall of the processing tank. A solid-liquid separation device characterized in that it is electrically connected to a filtrate chamber attached to the outside, and a filtrate chamber drain is opened on the lower wall of the filtrate chamber. The solid-liquid separator according to claim 1 or 2, wherein an overflow position adjustment function of an elbow is provided at the upper filtrate drain port so that the position of the elbow overflow position is adjustable. A solid-liquid separator characterized by being configured to add. 3. The solid-liquid separator according to claim 1 , wherein an opening position of the upper filtrate drainage port is opened at a movable portion of the upper shielding wall, and the upper filtrate drainage port is connected to the lower shielding wall. via the movable portion is moveable filtrate communicating path, solid-liquid, characterized in that have configured the upper filtrate water outlet to induce drainage of the filtrate of the upper space to the lower space separator.

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