JP6230449B2 - 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 taking out a solid content and a liquid content separately from a turbid solid.

  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. It is a well-known thing that it cannot be done, and it has become a subject to process in the state which removed the suspended solid contained in suspended sewage as much as possible.

  For this purpose, a set of filter pieces having a thickness of about 0.1 mm to 2 mm and different diameters for holding gaps is taken as one set, and a plurality of sets of filter pieces are inserted into and fixed to the rotary shaft and discharged. A plurality of the circular rotary filter bodies are arranged at equal intervals in the direction, and the laminated rotary filter bodies are rotated in the same direction. The outer peripheral edge is close to the outer peripheral edge of the small-diameter disk-like filter piece in the other laminated rotary filter body, and the large-diameter disk-like filter piece of this laminated rotary filter body is a small-diameter disk-shaped adjacent to the front and rear. It is combined so as to face the filter pieces, and by rotating each laminated rotary filter body, the large-diameter disk-like filter pieces rotate into a narrow gap of the small-diameter disk-like filter pieces, thereby rotating the filtration surface. While preventing clogging, it is below the inlet part of the upper and lower two layers of rotating rotary filter body. The filtered water with a small amount of suspended solids and gravity-filtered by the laminated rotating filter body and having a low processing load is forcibly filtered between the two upper and lower laminated rotating filter bodies and contains a large amount of suspended solids. An apparatus for filtering a suspension configured to be drained from a drain opening provided at the bottom of the apparatus together with filtered water having a large treatment load is known (for example, see Patent Document 1).

  As a means for adjusting the moisture content of the sludge, for example, as shown in FIGS. 1 and 2 of JP-A-2002-361299, the solid content concentration of the raw material sludge is measured by a sludge concentration sensor provided in the mixing tank. Measure and supply the flocculant solution so that the ratio of the solid content of sludge solids to the solid content of the flocculant solution is the same as the raw material sludge supplied within a certain period of time based on the measured solids concentration When the operation time of the chemical pump for the coagulant solution for supplying the amount and the coagulant solution is calculated, and the coagulant solution is supplied to the raw material sludge based on the operation time to perform mixing and dehydration processing, the mixing tank A predetermined amount of raw material sludge is supplied by the detection of the first liquid level sensor attached to the inside, and the sludge concentration sensor is measured while stirring for a predetermined time so that the sludge concentration becomes uniform. When the supply amount of the flocculant solution is calculated based on the set setting and supplied to the mixing tank, and the mixed sludge mixed and stirred for a predetermined time with the predetermined amount of raw material sludge that has already been supplied can be supplied to the dehydrator The dewatering machine is operated, the mixed sludge is supplied to the dewatering machine, dehydration is started, the liquid level of the mixed sludge stored in a predetermined amount in the mixing tank drops as the dehydration process proceeds, and eventually the mixing sludge enters the mixing tank. When it is confirmed that the mixed sludge has disappeared by the detection of the attached second liquid level sensor, the process from the supply of the mixed sludge to the disappearance of the dewatering process is defined as one batch process, which is determined in advance. The batch process is repeated until the target sludge treatment amount is reached, and the dewatering process is performed. Similarly to the apparatus of Patent Document 1, the filtered water with a small amount of suspended solids at the front stage of the dehydrator and the processing load is low. A sludge moisture content adjusting method and apparatus configured to be drained from a drain outlet opened at the bottom of the apparatus together with filtered water containing a large amount of solids and having a large processing load are known (see Patent Document 2). .

JP-A-2-31807 JP 2002-361299 A

  However, in the apparatus for filtering the suspension of Patent Document 1, the narrow gaps of the small-diameter disk-shaped filter pieces must be slightly larger than the thickness of the large-diameter disk-shaped filter pieces that rotate in a biting manner. Since the large-diameter disc-shaped filter piece is completely fixed to the rotating shaft and rotates on the same track, the cake of the filtered dehydrated product that has to be scraped off naturally increases the thickness of the large-diameter disc-shaped filter piece through a narrow gap. The area to be removed becomes solidified and clogging occurs on the filtration surface, resulting in insufficient solid-liquid separation of the suspension. In addition to the disadvantage that the waste must be discarded after removing the water separately so that excess liquid can be discharged, as shown in FIG. Low processing load of filtered suspended solids The filtered water drained from the drain opening at the bottom of the equipment, together with the filtered water that has been forcedly filtered and contains a large amount of suspended solids in the latter stage and the processing load is high, Since it is unavoidable that turbid solids are mixed in, it cannot be discharged as it is to a river, etc.For example, the supernatant water once stored in a storage tank and precipitated and separated over time is discharged in a batch process. It had to take time for the discharge treatment.

  Further, in the batch processing method in which the dehydrator of Patent Document 2 is operated intermittently, it is necessary to spend a lot of time for the sludge dewatering process or to use a large capacity dehydrator having a large dewatering capacity. In paragraph 0008, there is a method and apparatus for treating sludge to be dehydrated ".. Supplying raw sludge 1a made of various sludges generated from an external sewage treatment plant or an agricultural settlement drainage treatment facility into the mixing tank 2." In general, sludge concentration sensors are classified into ultrasonic type, near infrared light type, microwave type, etc. according to the measurement principle. In any measurement method, sludge properties (hydrous substances and Since the measurement accuracy varies depending on the difference in color and sludge shape, etc., it is a principle to use a sludge concentration sensor that is originally adapted to the properties of the sludge. Even if various sludge concentration sensors are used, it is necessary to process a huge amount of data to automatically determine which actual sludge concentration sensor value is true. In addition, when trying to cope with one type of sludge concentration sensor, the property change of the sludge to be dehydrated is always monitored, and the manual operation is frequently performed by trial and error according to the property based on the background of many years. In addition to the disadvantage that the original performance of the dehydrator cannot be exhibited unless much labor and maintenance management costs are applied for this purpose, as shown in FIG. As with the device, filtered water with low suspended solids at the front stage of the dehydrator and low treated load is drained from a drain outlet established at the bottom of the equipment together with filtered water with a large amount of suspended solids at the latter stage. Filtration Since it is unavoidable that suspended solids exceeding the specified value are mixed, it cannot be discharged as it is to a river or the like. For example, once stored in a storage tank, the precipitate is separated over time. The clear water had to be discharged in a batch process, and the discharge process had to take time.

  Therefore, in view of the above problems, the present invention discharges the cake of the filtered dehydrated product having a low water content without clogging the filtration surface of the laminated filter body, and does not require a separate waste disposal process. The present invention provides a solid-liquid separation device that does not take time for the discharge treatment of filtered water, and does not complicate the device itself, is inexpensive in production cost and maintenance, and can maintain the filtration function stably. For the purpose.

The invention according to claim 1 of the present invention has a stock solution supply port, a solid content discharge port, and a filtrate drainage port that receive the supply of the stock solution to be separated from the agglomeration mixing tank, and a filtration groove having a required interval between the filter pieces. An interval holding tool for holding the filter is integrally formed as a convex on the filter piece, or provided as a separate spacer, and the small diameter filtration plate and the large diameter filtration plate are alternately shaken in the interval holding tool between the filter pieces. A plurality of laminated filter bodies formed by fixing each filter piece in a laminated manner while being loosely fitted and movably arranged are arranged from the stock solution supply port side to the solid content discharge port side , and the gap holder the swingably the small diameter filtration plate or each slit of the formed loosely fit the larger diameter filter plates and drainage outflow groove, the two upper and lower stages in the solid content rising slope shape in the discharge direction of the discharge port pressure in a subsequent separation conveyance path is performed press filtration by opposing sequence was laminated濾体The coagulant is forcibly injected and mixed into the suspended sewage containing a large amount of the suspended solids filtered, thereby collecting and discharging the solid content of suspended fine particles contained in the suspended sewage and draining the filtered water from the liquid. In the lower part of the solid-liquid separator, filtration with a small processing load is carried out in the lower part of the solid-liquid separator, in which the suspended solids gravity-filtered in the previous stage of the separation conveyance path where gravity filtration is performed by the laminated filter bodies arranged in the lower stage A filtrate tank for taking water and draining it outside the machine, and taking a large amount of filtered water containing a large amount of suspended solids squeezed and filtered in the subsequent stage of the separation conveyance path, injecting a flocculant, and aggregating two types of fractionation preparative aquarium sludge relay tank was decorated sludge stirring pump to uniformly stir the filtrate state provided by homogeneously stirred filtrate sludge transfer pump of sludge relay tank, the mixing flocculation tank again Alternatively, it can be returned to the solid-liquid separator for efficiency. The most important feature that is configured to Ku separate filtration.

In the solid-liquid separator according to claim 1 of the present invention, the invention according to claim 2 of the present invention is such that a plurality of laminated filter bodies arranged from the stock solution supply port side to the solid content discharge port side are adjacent to each other. One laminated filter body is repeatedly laminated in the order of a filter piece, a small-diameter filtration plate, a filter piece, and a large-diameter filtration plate, and the other laminated filter body is a filter piece, a large-diameter filtration plate, a filter piece, and a small-diameter filtration plate. It is repeated in order stacked, and two filter plates of the filter in the groove of the swingably loosely fitted stowed small filter plates and a large径濾over plate between濾片 does not interfere with the adjacent stacked濾体each other and they are stacked in a stacked order.

According to the solid-liquid separator according to the first or second aspect of the present invention, the coagulant is forcibly applied to the suspended sewage that has been forcibly filtered in the subsequent stage of the separation conveyance path and contains a large amount of suspended solids. By injecting and mixing, the suspended fine particles contained in the suspended sewage are further promoted to reaggregate, so that the filter dehydrated cake with a low water content is discharged without clogging the filtration surface of the laminated filter body. Therefore, the solids can be more efficiently separated into solids and discharged and the filtered water drainage of the liquids. Therefore, the wastes can be removed as they are without the need for waste disposal. together can be transported waste, with a small filtered water gravity filtered suspended solids is less processing load preceding separation conveying path is capable discharged without precipitation separation process, subsequent separation conveyance path forcibly squeezed filtered suspended solids in There are many filtered water of inclusive processing load often suspended sewage in the sludge relay tank injecting a coagulant was stirred uniformly filtered water state of aggregation in the sludge stirring pump without being drained to the outside of the apparatus is Since the sludge transfer pump circulates and returns to the re-dehydration process, the dewatering process continues continuously and efficiently without taking time to discharge the filtered water, and the equipment itself is complicated. In addition, the manufacturing cost and the maintenance are inexpensive, and the filtration function can be stably maintained.

  Further, according to the solid-liquid separation device according to the second aspect of the present invention based on the first aspect of the present invention, the convex piece integrally formed with the filter piece or the separate member fitted on the rotating shaft between the filter pieces is provided. A small-diameter filter plate that is loosely fitted and accommodated in a filter groove having a predetermined interval between the filter pieces by a spacer, and an outer edge of the filter groove of the other laminated filter body disposed opposite to the outer edge of the small-diameter filter plate. Two types of filtration plates, a large-diameter filtration plate that is loosely received and accommodated in a filtration groove so as to be able to swing, and each of the filter pieces interposing the protrusions or spacers, are adjacent to each other on the other laminated filter body. A plurality of laminated filter bodies, which are stacked in a stacking order in which the outer edges of the opposing filtration plates facing each other by the stacking order configuration do not interfere with each other and are arranged adjacent to each other in two upper and lower stages, receive suspended sewage and are solidified. Each liquid is separated and filtered and transferred to the solid content outlet. By rotating and driving each of the two upper and lower laminated filter bodies by driving and rotating with a rotating shaft provided at the center of the bed filter body, the suspended solids are discharged into the solid content outlet while squeezing the suspended sewage. Since it is driven and rotated so as to be transferred toward the upper side, the rocks projecting from the outer edge of the filtration groove of the other laminated filter body disposed opposite to the outer edge of the small-diameter filtration plate arranged in two adjacent upper and lower positions. The synergistic action of the swinging action of the large-diameter filtration plate that is freely fitted and accommodated in the filtration groove and the shearing action that occurs between the rolling oppositions of the outer periphery of the large-diameter and small-diameter filtration plates is arranged adjacent to each other. In addition, since it acts on the adjacent opposing space of the entire width of each laminated filter body, the cake of filtered dehydrated material adheres and solidifies in the slits of the filtration groove and drainage groove, so it is remarkable. In addition, clogging of the filtration surface of the entire width of each laminated filter body is prevented. From has the effect of being able to maintain a more continuously and efficiently solid-liquid separation function.

BRIEF DESCRIPTION OF THE DRAWINGS It is a vertical side view of the multiple disk type solid-liquid separator in Example 1 of this invention. It is sectional drawing of the XX arrow direction of FIG. (A) of the laminated filter body comprised from the convex filter piece integrally molded as a convex of Example 1 of this invention and a large diameter and a small diameter filtration plate, (b) is the vertical side surface. FIG. It is a principal part expanded side view which showed the adjacent aspect of the laminated filter body comprised from the convex filter piece integrally molded as a convex of Example 1 of this invention, and a large diameter and a small diameter filtration plate. (A) of the large diameter filtration plate which comprises the laminated filter body of Example 1 of this invention is a front view, (b) is the vertical side view. (A) of the small diameter filtration plate which comprises the laminated filter body of Example 1 of this invention is a front view, (b) is the longitudinal section side view. (A) of the convex filter piece which comprises the laminated filter body of Example 1 of this invention is a front view, (b) makes the convex form the same convex installation height by the front and back in (a). It is a vertical side view of the example, and (c) is a vertical side view of another example in which the convex height of the protrusion is formed higher in one surface than in the other surface in (a). The principal part expanded side view which showed the adjacent aspect of another example which replaced the convex filter piece of the said FIG. 4, and comprised the spacer between filter pieces which comprises the laminated filter body of Example 1 of this invention. is there. It is a vertical side view of the screw-type solid-liquid separator in Example 2 of this invention. It is a principal part expanded sectional view of the YY arrow direction of FIG. The example of the case where each convex filter piece integrally molded as a convex is supported and fixed in the filtration groove of a predetermined interval by the support fixture of Example 2 of the present invention with the aid of the detail A part of FIG. It is a principal part expanded sectional view of the example which showed the operation | movement aspect of this filtration plate by the turning sliding action of the filtration plate inner periphery and screw blade outer periphery which were freely fitted and accommodated in the groove | channel. With the aid of the detail A part of FIG. 9, the support fixture of Example 2 of the present invention replaces the convex filter piece of FIG. 11 with spacers between the filter pieces to form a filtration groove at a predetermined interval. Another example of the fixed support is an enlarged cross-sectional view of the main part of the filtration plate, which shows the operation mode of the filtration plate by the pivoting and sliding action of the inner periphery of the filtration plate and the outer periphery of the screw blade, which is swingably fitted in the filtration groove. FIG.

  Hereinafter, in the solid-liquid separator for separating and filtering the solid content and liquid contained in the suspended sewage of the present invention, it has a stock solution supply port, a solid content discharge port, and a filtrate drainage port, and a required interval between each filter piece. An interval holder for holding in the filter groove is integrally formed as a convex on the filter piece, or each filter piece is fixed in a laminated manner while being interposed between the filter pieces as a separate spacer, Suspended solids that have been squeezed and filtered at the subsequent stage of the separation conveyance path formed by the laminated filter body, with each slit formed by loosely fitting a filtration plate in each filtration groove as a drainage groove. By forcibly injecting and mixing the flocculant into the suspended sewage containing a large amount of matter, it is efficiently separated into the solid waste collection and discharge of the suspended fine particles contained in the suspended sewage and the filtered water drainage of the liquid, In the lower part of the solid-liquid separator, there are few suspended solids that have been gravity filtered in the previous stage of the separation conveyance path. A filtrate tank that draws filtered water with a small processing load and drains it outside the machine, and takes a filtered water with a large processing load that contains a large amount of suspended solids that have been squeezed and filtered after the separation conveyance path. In response to this, two types of separation water collection tanks are provided, a sludge relay tank equipped with a sludge agitation pump that injects a flocculant and uniformly agglomerates filtered water, and the sludge relay tank is uniformly agitated. A configuration for efficiently separating and filtering by returning to a coagulation mixing tank or solid-liquid separation device by a transfer pump as an embodiment will be described in detail with reference to the drawings based on examples of the present invention as follows. However, the present invention is not limited to the embodiment.

  The multi-disc type solid-liquid separator 20T according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8. The suspended sewage sent from a sludge storage tank (not shown) or the sludge relay tank 40 is agglomerated and mixed. The flocculant received from the tank 50 and fed from the flocculant injecting section 50G is uniformly mixed and stirred by the stirrer 50K, so that suspended fine particles of suspended sewage are granulated and solid aggregation is promoted. The stock solution to be separated is supplied into the solid-liquid separation device 20T from the stock solution supply port 10 provided in the upper part of the solid-liquid separation device 20T, and solid-liquid separation is performed on the discharge side wall 9d of the solid-liquid separation device 20T. A solid content discharge port 11 for discharging the cake of the filtered solid dehydrated product to the outside of the solid-liquid separation device 20T is provided, and between the raw solution supply port 10 and the solid content discharge port 11, FIG. As shown in FIG. A plurality of laminated filter bodies 1... 1 arranged in two vertical stages are arranged at intervals. As shown in FIGS. 3 and 5 to 7, the laminated filter body 1 has a plurality of convex filter pieces. Forming the filtration groove RS by integrally molding 5T, desirably by providing a recess R at the center and bringing the end faces of the protrusions T protruding at the same height on the front and back surfaces into contact with each other, or as shown in FIG. In this way, a large-diameter filtration plate is alternately formed in each filtration groove RS while forming between the filter pieces 5 into the filtration grooves RS with a required interval by separate spacers S fitted to the rotary shaft 4 between the filter pieces 5. Specifically, the rotary shaft 4 has a locking function such as a D-cut or key (not shown) in which a part of a circle is cut into a flat surface so that the 2L and the small-diameter filtration plate 2S can be moved in the axial direction. Filter pieces 5 (T) each having a shaft insertion hole 4h drilled in the center and large and small diameter filtration plates 2L, 2 While loosely fitting S, the convexity T projecting from the convexity filter piece 5T is loosely fitted into the convexity loose fitting hole 2Lh of the large diameter filtration plate 2L or the convexity notch hole 2Sh of the small diameter filtration plate 2S. The large-diameter filtration plate 2L and the small-diameter filtration plate 2S are alternately fitted in each filtration groove RS so as to be movable in the axial direction, and are opposed to the inner wall surface of the filtration groove RS that controls the drainage separation function. Opposite slits with both end faces of the filtration plate 2L or 2S are formed in the drainage outflow groove G, and each laminated filter body 1... 1 is a front side wall 9f of the solid-liquid separator 20T as shown in FIG. And a rotating shaft 4 that is pivotally supported by a bearing 17 provided outside the rear side wall 9r, and is rotationally driven by a drive transmission tool 16 (for example, a worm gear) provided outside the front side wall 9f. Locking type of the rotating shaft 4 so as to rotate in synchronization. A convex filter piece 5T integrally formed with the convex element T on a filter piece 5 having a different diameter with a shaft insertion hole 4h formed in the center so as to fit in the shape, or a rotating shaft 4 between the filter pieces 5 is fitted. A small-diameter filtration plate 2S that is swingably fitted and accommodated in a filtration groove RS having a required interval between the filter pieces 5 formed by separate spacers S, and disposed opposite to the outer edge of the small-diameter filtration plate 2S. The two types of filtration plates 2S, 2L, a large-diameter filtration plate 2L loosely received and accommodated in the filtration groove RS projecting from the outer edge of the filtration groove of the other laminated filter body 1, and the convex filter The filter pieces 5 interposing the pieces 5T or the spacers S are stacked in a stacking order in which the outer edges of the opposing filter plates 2S and 2L do not interfere with each other due to the stacking order configuration of the other adjacent laminated filter body 1. In addition, a plurality of laminated filter bodies that are adjacently arranged in two separate upper and lower stages .. The outer edge of the main part of the seal member 15 attached to the supply side wall 9s and the discharge side wall 9d of the solid-liquid separation device 20T so as to efficiently recover the solid content is disposed at the end of the solid content discharge port 11 side. The outer peripheral edge of the seal member 15 is preferably opposed to the outer peripheral edge of the (convex) filter piece 5 (T) of the laminated filter body 1 at the upper and lower stages and the lower end of the stock solution supply port 10 side with a slight gap therebetween. By attaching a brush with less sliding resistance to the shaft, the sealing function can be further improved and the increase in the torque of the rotating shaft 4 is suppressed. The large-diameter filtration plate 2L and the small-diameter filtration plate 2S are arranged in the filtration groove RS. The rotary shaft 4 is configured to rotate synchronously while swinging in the direction.

  As shown in FIG. 1, the separation formed between the upper and lower sides of a plurality of laminated filter bodies 1. In the conveyance path 1H, the rear stage of the separation conveyance path 1H between the upper and lower laminated filter bodies 1 ·· 1 by the flocculant supplied from the flocculant injection part 20G provided at the center upper part of the upper laminated filter bodies 1 ·· 1 array. The coagulant is forcibly injected into and mixed with the suspended sewage containing a large amount of suspended solids that have been pressed and filtered in order to granulate the suspended fine particles and promote solid agglomeration. The filter dehydrated cake having a low water content is discharged from the solid content outlet 11 without clogging the filtration surface of the product, thereby further improving the efficiency of recovery and discharge of solid content and drainage of filtered water. It is often solid-liquid separated.

Furthermore, as shown in FIG. 1, suspended solids gravity filtered at the lower part of the solid liquid separation device 20T at the front stage of the separation conveying path 1H of the lower laminated filter bodies 1. The filtrate tank 30 is provided with a filtrate outlet RD for taking a small amount of filtered water with a small processing load and draining it outside the machine, and contains a large amount of suspended solids that have been squeezed and filtered in the subsequent stage of the separation conveyance path 1H. I treated with flocculants water intake to be supplied from the coagulant injection unit 40G large filtered water load, taken two fractionation of sludge relay bath 40 was furnished sludge agitation pump KP to uniformly stir the filtrate state of aggregation A water tank is provided, and the uniformly agitated filtered water in the sludge relay tank 40 is again returned to the coagulation mixing tank 50 or the solid-liquid separation device 20T by the sludge transfer pump OP, thereby efficiently separating and filtering. ing.

  The screw-type solid-liquid separator 20S according to the second embodiment of the present invention will be described with reference to FIGS. 9 to 11. The suspended sewage sent from a sludge storage tank (not shown) or the sludge relay tank 40 is agglomerated and mixed tank. 50, the flocculant administered from the flocculant administration unit 50G is uniformly mixed and stirred by the stirrer 50K, whereby the suspended fine particles of suspended sewage are granulated and solid aggregation is promoted. The screw conveyor SC that is rotated by driving the stock solution to be separated by the prime mover SCM was established at the top of the solid-liquid separation device 20S fitted in the separation transport path 1H of the central hole of the laminated filter body 1. The screw blade SB of the screw conveyor SC is supplied to the solid-liquid separation device 20S from the stock solution supply port 10 and gradually decreases from the start opening OS to the end opening OE in the laminated filter body 1. The outer diameter of the screw blade SB is larger than the inner diameter of the filtration plate 2, and smaller than the inner diameter of the filter piece 5 having the support fixture 5B and the convex filter T of the convex filter piece 5T or the spacer S interposed therebetween. Each of the formed (convex) filter pieces 5 (T) and each filter plate 2 is laminated, and the end opening OE is fixed by using the start end opening OS in the laminated filter body 1 as an inlet for suspended sewage. Each filter piece 5 is supported and fixed in a filtration groove RS at a predetermined interval by a support fixture 5B and a protrusion T or a spacer S as a part discharge outlet, and can swing within the filtration groove RS. Each of the filtration plates 2... 2 is operated by the pivotal sliding action of the inner peripheral edge of each filtration plate 2 and the outer peripheral edge of the screw blade SB that are loosely fitted and accommodated, and is opposed to the inner wall surface of the filtration groove RS that controls the drainage separation function. The opposing gap between the two end faces of the filtration plate 2 By forming in the drainage outflow groove G, clogging is prevented.

  Then, as shown in FIG. 9, the screw blade SB has a wide provisional reduction pitch from the start end opening OS of the laminated filter body 1 toward the center, and a front stage portion of the separation conveyance path 1H of the laminated filter body 1 that performs large gravity filtration; The boundary between the central stage of the separation filter 1 of the laminated filter body 1 and the rear stage part of the separation conveyance path 1H of the laminated filter medium 1 in which the screw blade SB performs small squeezing filtration with a narrowly reduced pitch toward the terminal opening OE. The flocculant supplied from the flocculant injecting section 20G provided at the upper center of the laminated filter body 1 is gradually narrowed from the central portion of the separation conveyance path 1H of the laminated filter body 1 to the terminal opening OE. The screw blade SB which becomes smaller is a powerful transfer action of the screw conveyor SC by a slightly decreasing pitch, and the discharge pressure adjusting valve provided at the solid outlet 11 of the terminal opening OE of the separation conveying path 1H of the laminated filter body 1 Due to the action of suppressing the discharge of V, the coagulant is forcibly injected and mixed into the suspended sewage that has been pressed and filtered and contains a large amount of suspended solids, and the suspended fine particles are granulated to promote solid aggregation. As a result, the filtered dehydrated cake having a low water content is discharged from the solid outlet 11 without clogging the filtration surface of the laminated filter body 1, thereby further collecting and discharging solids. Solid-liquid separation is efficiently performed with the filtered water drainage for a minute.

  Furthermore, as shown in FIG. 9, at the lower part of the solid-liquid separation device 20S, gravity filtration is performed before the central portion from the opening end OS of the separation conveyance path 1H of the laminated filter body 1 at the inlet on the stock solution supply port 10 side. A filtrate tank 30 provided with a filtrate drain port RD for taking a small amount of filtered water with a small processing load and draining it outside the apparatus, and a central portion of the separation conveying path 1H of the laminated filter body 1 From the coagulant supplied from the coagulant injecting unit 40G as needed, after taking in a large amount of filtered water containing a large amount of suspended solids that have been squeezed and filtered in the subsequent stage between the terminal opening OE and the terminal opening OE Two kinds of separation water collection tanks of sludge relay tank 40 equipped with sludge agitation pump KP that uniformly agitates the filtered water are provided, and the uniformly stirred filtrate water in sludge relay tank 40 is agglomerated again by sludge transfer pump OP. Mixing tank 50 or solid-liquid separator 2 By returning to the starting solution feed inlet 10 of the S, and is configured to efficiently separated filtration.

DESCRIPTION OF SYMBOLS 1 Laminated filter body 1H Separation conveyance path 2 Filtration plate 2L Large diameter filtration plate 2S Small diameter filtration plate 4 Rotating shaft 5 Filter piece 5T Convex filter piece 10 Stock solution supply port 11 Solid content discharge port 20T Solid-liquid separator (Multiple disk type)
20S solid-liquid separator (screw type)
30 Filtrate tank 40 Sludge relay tank G Filtrate outflow groove OE End opening OS Start opening RS Filtration groove RD Filtration water drain S Spacer SB Screw blade SC Screw conveyor T Convex

Claims (2)

In the solid-liquid separation device that separates and filters the solid content and the liquid content contained in the suspended sewage, the raw material supply port that receives the supply of the stock solution to be separated from the coagulation mixing tank , the solid content discharge port, and the filtrate water discharge port, An interval holder for holding the gaps between the filter pieces in a required interval is integrally formed as a convex on the filter pieces, or provided as a separate spacer, and a small diameter filter is provided in the interval holder between the filter pieces. From the stock solution supply port side to the solids discharge port side, a laminated filter body formed by fixing each filter piece in a stacked manner while interposing a plate and a large-diameter filtration plate so as to be swingable alternately and interposing them a plurality array, each slit formed by loosely fitted swingably the small filter plates or the larger diameter filter plates in the gap retainer and drainage outflow grooves, discharge of the solid matter discharge port pressing the laminated濾体facing arranged in two upper and lower stages at rising gradient-like direction filtration By injecting mixing forces the coagulant is laden suspension wastewater squeeze filtered suspended solids in a subsequent separation conveyance path to be performed, the solid content of the suspension particles contained in suspension wastewater Efficient separation into recovered discharge and filtered water drainage of the liquid is carried out , and the lower part of the solid-liquid separator is suspended by gravity filtration at the front stage of the separation conveyance path where gravity filtration is performed by the laminated filter body arranged at the lower stage. A filtrate tank that takes in a small amount of filtered water with a small amount of turbid solids and drains it outside the machine, and a filtered water with a large processing load that contains a large amount of suspended solids that have been squeezed and filtered after the separation conveyance path. Two types of separation water collection tanks are provided, a sludge relay tank equipped with a sludge agitation pump that uniformly infuses the flocculant filtrate by taking water and injecting flocculant, and the uniformly stirred filtered water in the sludge relay tank the sludge transfer pump, the mixing flocculation tank or solid again By returning to the separating device, efficiently separate solid-liquid separator, characterized by being configured to filter.
Among the laminated filter bodies arranged in a plurality from the stock solution supply port side to the solid content discharge port side, one of the laminated filter bodies adjacent to each other is the order of filter pieces, small-diameter filtration plates, filter pieces, and large-diameter filtration plates. The other laminated filter body was repeatedly laminated in the order of the filter piece, large-diameter filtration plate, filter piece, and small-diameter filtration plate, and was loosely accommodated in a filtration groove between the filter pieces . 2. The solid-liquid separation device according to claim 1, wherein the two types of filtration plates, a small-diameter filtration plate and a large- diameter filtration plate, are configured in a stacking order that does not interfere with adjacent stacked filter bodies .

Images