JP2019209277A - Pressurized rotating plate type solid-liquid separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure type rotary plate type solid-liquid separation device capable of obtaining dehydrated sludge in which the dehydrated sludge is not clogged in a pressure dehydration section and the water content is further reduced. SOLUTION: A rotary plate is rotatably arranged between a plurality of slit bars to form an upstream portion and a downstream portion, and a pressure plate is arranged above the rotary plate so that the upstream portion has a gravity dehydration unit, The downstream part is used as a pressure dehydration part with a pressure plate, and sludge-containing water is supplied from above the uppermost rotary plate to remove liquid and separate it from the gaps between the rotary plates and the gap between the rotary plate and the slit bar. By doing so, the dehydrated sludge placed on the rotary plate is moved to the gravity dehydration unit and the pressure dehydration unit, and the dehydrated sludge is discharged from the dehydrated sludge discharge unit provided at the most downstream part. In the liquid separation device, the number of rotary plates arranged in the pressure dehydration unit is smaller than the number of rotary plates arranged in the gravity dehydration unit, and the pressure type rotary plate type solid-liquid separation device is characterized. [Selection diagram] Figure 1

Description

  The present invention relates to a solid-liquid separation device for dewatering sludge water generated in a wastewater treatment process or the like in a sewage treatment plant, a human waste treatment plant, or other facilities.

  Sludge water generated in sewage treatment plants, human waste treatment plants or other industries is dehydrated and reduced in volume by the following methods.

  First, sludge water is agglomerated in advance to coarsen sludge particles. Next, use a filter press, belt press, screw press, centrifugal dehydrator, vacuum pressure dehydrator, multiple rotary plate type solid-liquid separator, pressurized rotary plate type solid-liquid separator, etc. A so-called dehydration process is performed to increase the solid concentration while discharging.

  The multi-rotary plate type solid-liquid separator is a process in which sludge water is sandwiched between an upper circular rotary plate group and a lower circular rotary plate group, and the liquid is rotated in the process of pushing the sludge water downstream by the rotation of both rotary plates. The dewatered sludge is discharged from a gap between the dewatered sludge and the dehydrated sludge discharged from the dewatered sludge discharge section provided in the most downstream portion. In addition, the pressurization type rotary plate type solid-liquid separator is configured such that an elliptical rotary plate is rotatably arranged between a plurality of slit bars to form an upstream portion and a downstream portion, and is added above the rotary plate. The pressure plate is disposed, the upstream portion is a gravity dewatering portion, the downstream portion is a pressure dewatering portion by pressing of the pressure plate, and sludge-containing water is supplied from above the rotating plate of the most upstream part, and the gaps between the rotating plates and By removing the liquid from the gap generated in the rotating plate and the slit bar and separating it, the dewatered sludge placed on the rotating plate is moved to the gravity dewatering unit and the pressure dewatering unit, and the dewatered sludge is moved to the most downstream part. It is discharged from the provided dewatered sludge discharge section.

  Both the multi-rotary plate type solid-liquid separator and the pressurized rotary plate type solid-liquid separator have the advantages of easy operation, no filter cloth replacement, etc., and easy maintenance. In addition, it is possible to pressurize with the pressure plate, and when the elliptical rotating plate changes from the major axis to the minor axis due to the rotation of the elliptical rotating plate, a strong thrust is applied to the dewatered sludge on the downstream side. Compared with the rotary plate type solid-liquid separator, the pressurized rotary plate type solid-liquid separator can obtain dehydrated sludge with a reduced water content, and has a large treatment capacity. The price is low. Therefore, in recent years, the pressure type rotary plate type solid-liquid separator is more frequently used than the multiple rotary plate type solid / liquid separator.

Japanese Patent Laid-Open No. 2016-13556

  However, the conventional pressurized rotary plate type solid-liquid separator has the following drawbacks.

  In other words, when the pressure plate existing above the rotating plate is pressed further downward in order to further reduce the moisture content, the rotating plate bites into the dewatered sludge placed on the rotating plate of the pressure dewatering unit and turns around. The dewatered sludge is not discharged from the dewatered sludge discharge section. In short, dewatered sludge is clogged in the pressure dewatering section.

  Therefore, conventionally, dewatering treatment is performed by pressing the pressure plate so that the dewatered sludge is not clogged in the pressure dewatering section. However, it is not possible to obtain a dehydrated sludge having a satisfactory water content.

  The present invention solves the above-mentioned drawbacks of the conventional pressurized rotary plate type solid-liquid separator, does not clog the dehydrated sludge in the pressurized dewatering section, and provides a dehydrated sludge having a reduced moisture content. An object of the present invention is to provide a rotating plate type solid-liquid separation device.

  The present invention only slightly changes the structure of a conventionally used pressure-type rotating plate type solid-liquid separator, and does not clog the dewatered sludge in the pressure dewatering section and further reduces the water content. As a result, it was found that a dehydrated sludge was obtained.

That is, the pressurized rotary plate type solid-liquid separator according to the present invention forms an upstream portion and a downstream portion by rotatably arranging a rotary plate between a plurality of slit bars, and is added above the rotary plate. The pressure plate is arranged and the upstream portion is a gravity dewatering portion, the downstream portion is a pressure dewatering portion by a pressure plate, and the sludge-containing water is supplied from above the rotation plate at the most upstream part, and the gap between the rotation plates and the rotation plate By removing liquid from the gap generated in the slit bar and separating it, the dewatered sludge placed on the rotating plate is moved to the gravity dewatering part and the pressure dewatering part, and the dewatered sludge is provided in the most downstream part. In the pressurized rotary plate type solid-liquid separator that discharges from the sludge discharge part,
The number of rotating plates arranged in the pressure dehydrating unit is reduced with respect to the number of rotating plates arranged in the gravity dehydrating unit.

  In such a pressure type rotating plate type solid-liquid separation device according to the present invention, the number of rotating plates arranged in the pressure dehydrating unit is 30% to 70% with respect to the number of rotating plates arranged in the gravity dehydrating unit. It is preferable to make it into a range, and it is more preferable to make it into the range of 45%-55%. By configuring the rotating plate with such a quantity, it is possible to effectively prevent clogged dewatered sludge in the pressure dewatering section.

  In such a pressure type rotating plate type solid-liquid separation device according to the present invention, by disposing every other rotating plate before and after the rotating plate in the pressure dehydrating unit and left and right, it is arranged in the pressure dehydrating unit. It is preferable that the number of rotating plates to be in the range of 45% to 55% of the rotating plates arranged in the gravity dehydrating unit is that a uniform and low water content dehydrating process can be realized. In addition, it is also preferable that the rotating plate has an oval shape, an oval shape, or a rectangular shape obtained by rounding or cutting off corners from the standpoint of achieving a uniform and low water content dehydration treatment.

  The pressure disc type solid-liquid separation device of the present invention is arranged in, for example, the gravity dewatering unit by reducing the number of rotating plates arranged in the pressure dehydrating unit relative to the number of rotating plates arranged in the gravity dehydrating unit. The number of rotating plates arranged in the pressure dehydrating unit with respect to the number of rotating plates to be used is in the range of 30% to 70%, preferably in the range of 45% to 50%, most preferably in the pressure dehydrating unit. By removing every other rotating plate placed on the front, rear, left and right of the rotating plate, the number of rotating plates placed in the pressure dewatering unit ranges from 45% to 50% of the rotating plate placed in the gravity dewatering unit. By doing so, the dewatered sludge can be obtained without clogging the dewatered sludge in the pressure dewatering section and with a lower moisture content.

It is explanatory drawing which shows an example of the pressurization type rotary plate type solid-liquid separator of this invention. It is explanatory drawing which expanded the principal part of the pressurization type rotary plate type solid-liquid separation apparatus. It is the partially cutaway explanatory view which looked at the rotation plate and slit bar of the pressurization type rotation plate type solid-liquid separation device of the present invention from the upper part. It is a partial notch explanatory drawing seen from the rotating plate and slit bar of the conventional pressurization type rotating plate type solid-liquid separator. It is explanatory drawing which showed the rotating plate which can be used for this invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory view of a pressurized rotary plate type solid-liquid separator 1 according to the present invention, and 2 is a housing of the pressurized rotary plate type solid-liquid separator 1. A sludge-containing water supply pipe 3 is connected to the upper end of the housing 2, and a separation liquid discharge pipe 4 is attached to the lower end of the housing 2.

  A rotating shaft 6 fitted with a large number of elliptical rotating plates 5 is axially supported from the upstream side to the downstream side in the housing 2, and a slit bar 7 is provided horizontally above each rotating shaft 6. Yes.

  FIG. 2 is an enlarged external view of the main part of the pressurized rotary plate type solid-liquid separation device 1. A rotary plate 5 is arranged between a large number of slit bars 7, and each rotary plate 5 is interposed via a spacer ring 8. Are fitted on the rotary shaft 6.

  The thickness of each slit bar 7 and the rotating plate 5 is 1 to 2 mm, and the number of the slit bars 7 varies depending on the processing amount, but 100 to 500, and the rotating plate 5 fitted to one rotating shaft 6 is It is about 100 to 500 sheets. Further, the major axis of the ellipse of the rotating plate 5 is 100 to 200 mm, and the minor axis is 50 to 100 mm. Between the slit bars 7, the rotating plates 5 are arranged in 8 to 10 rows from upstream to downstream. There are many.

  The rotating directions of the rotating plates 5 are the same, and the rotating plates 5 that are located between the same two slit bars 7 and are adjacent to each other in the vertical direction are set to rotate without contacting each other.

  A pressure plate 9 having three inclination angles, i, b, and c, is installed on the upper portion of the housing 2 from the upstream side to the downstream side. The part is a pressure dehydration part B. A pressure mechanism 10 is attached to the downstream side of the pressure plate 9, and the pressure plate 9 is moved up and down by the pressure mechanism 10 with the pressure plate support shaft 11 as a fulcrum. A gap with the downstream pressure plate 9 can be varied, and the gap serves as a dewatered sludge discharger 12.

  The dewatered sludge 13 discharged from the dewatered sludge discharge unit 12 falls into the dewatered sludge receiving tank 14. An air cylinder or the like can be used as the pressurizing mechanism 10.

  FIG. 3 is a partially cutaway explanatory view of the rotary plate 5 and the slit bar 7 of the pressurized rotary plate type solid-liquid separation device 1 as viewed from above. Compared with that of the part A, every other rotating plate to be arranged on the front, rear, left and right is excluded, and the number of rotating plates arranged on the pressure dewatering part B is about 50 compared with that of the gravity dewatering part A. %. In FIG. 3, the dotted line indicates the rotating shaft 6.

  FIG. 4 is a partially cutaway explanatory view of the rotary plate 5 and slit bar 7 of the conventional pressurized rotary plate type solid-liquid separator as viewed from above, and the rotations disposed in the gravity dehydrating unit A and the pressurized dehydrating unit B. The plates 5 have exactly the same quantity.

  In the pressurized rotary plate type solid-liquid separator of the present invention and the conventional pressurized rotary plate type solid-liquid separator, the number of rotary plates 5 arranged in the gravity dewatering section A is added as shown in FIG. The point which reduced the quantity of the rotating plates 5 arrange | positioned in the pressure dehydration part B differs greatly.

[Action]
Next, the operation of the pressurized rotary plate type solid-liquid separator 1 of the present invention will be described.
While rotating each rotating plate 5, sludge water having a water content of 97 to 99%, which is pre-aggregated with the organic polymer flocculant alone or with the organic polymer flocculant and the inorganic flocculant, is supplied to the sludge water. 3 from above the uppermost rotary plate 5 of the pressurized rotary plate type solid-liquid separator 1.

  The agglomerated solid matter in the sludge water becomes dehydrated sludge 13 and stays at the upper part of the rotary plate 5 or the slit bar 7, and the water falls downward from the gap between the rotary plates 5 or the gap between the rotary plate 5 and the slit bar 7. . The dewatered sludge 13 is moved by the rotation of each rotary plate 5 from the upstream side to the downstream side of each rotary plate 5 while the dehydrated sludge 13 is placed on the upper portion of the rotary plate 5 or the slit bar 7, and the dehydrated sludge is sequentially also in between. The moisture in 13 is excluded. The dewatered sludge 13 on the upper part of the rotating plate 5 is finally discharged into the dewatered sludge receiving tank 14 as the dewatered sludge 13 from the dewatered sludge discharge portion 12 which is the gap between the slit bar 7 and the pressure plate 9 located at the most downstream side. The

  Sludge water with a moisture content of 97 to 99% becomes dehydrated sludge with a moisture content of around 92% in the gravity dehydration part A of the pressurized rotary plate type solid-liquid separator 1, and in the pressure dehydration part B due to the pressing force by the pressure plate 9 Furthermore, when it is dehydrated and discharged from the dewatered sludge discharge section 12, the dehydrated sludge having a water content of 80 to 85% is dehydrated. Further, the water removed during this time is discharged from the separation water discharge pipe 4.

  In the present invention, every other rotating plate disposed on the front, rear, left and right of the rotating plate 5 in the pressure dewatering unit B is eliminated, so that the dewatered sludge 13 in the pressure dewatering unit B is pressed even if the pressure plate 9 is pressed strongly. Therefore, the dewatered sludge 13 can be discharged well from the dewatered sludge discharge section 12 without the rotating plate 5 biting into and spinning around. That is, the dewatered sludge 13 is not clogged with the pressure dewatering part B.

  In the conventional pressurized rotary plate type solid-liquid separator shown in FIG. 4, the number of rotary plates arranged in the gravity dehydrating part A and the pressurized dehydrating part B is exactly the same. When the pressure plate is pressed with the same pressing force as the apparatus, the rotating plate bites into the dewatered sludge in the pressure dewatering section B and spins, the dewatered sludge is clogged in the pressure dewatering section B, and the dewatered sludge is discharged from the dewatered sludge discharge section. It cannot be discharged.

  Therefore, in the conventional pressure type rotary plate type solid-liquid separation device, the rotary plate does not bite into the dewatered sludge in the pressure dehydrating unit B, and the pressure plate can be pressed only with a weak pressing force that does not rotate idly. As a result, only dehydrated sludge having a water content of 88 to 91% can be obtained.

  As the rotating plate 5 that can be used for the rotating plate 5 of the pressurized rotating plate type solid-liquid separation apparatus of the present invention shown in FIG. 1, as shown in FIG. Mention may be made of a rounded or cut rectangle F.

  In addition, the pressure-type rotating plate type solid-liquid separator of the present invention is characterized in that the number of rotating plates 5 arranged in the pressure dehydrating unit B is reduced with respect to the number of rotating plates 5 arranged in the gravity dehydrating unit A. However, the number of rotating plates 5 arranged in the pressure dehydrating unit is 30% to 70%, preferably 45% to 55%, relative to the number of rotating plates 5 arranged in the gravity dehydrating unit A. Good.

  For example, when it is 29% or less, since the quantity of the rotating plate 5 is too small, the propulsive force for moving the dewatered sludge to the downstream is weakened, and the dewatered sludge is easily clogged in the pressure dewatering section B. It tends to be impossible to discharge dewatered sludge.

  In addition, when the amount is 71% or more, since the number of the rotating plates 5 is too large, the rotating plates 5 are likely to bite into the dewatered sludge, and the dehydrated sludge is easily clogged in the pressure dewatering portion B. It tends to be impossible to discharge dewatered sludge.

  As shown in FIG. 3, the number of rotating plates 5 disposed in the pressure dewatering unit B is eliminated by removing every other rotating plate 5 disposed on the front, rear, left and right of the pressure dewatering unit B. Is most preferably in the range of 45% to 55% of the rotating plate 5 arranged in the gravity dewatering part A.

  Note that the embodiment shown in FIG. 3 excludes every other rotating plate 5 arranged on the left and right, before and after the entire rotating plate 5 in the pressure dehydration unit, but is fitted to the rotating shaft located on the most downstream side. Even if the rotating plate 5 that has been encroached on the dewatered sludge, the dewatered sludge is only discharged from the dewatered sludge discharge section, so there is no particular effect on the clogging of the dewatered sludge, and therefore this most downstream Instead of removing only the rotating plate fitted to the rotating shaft located at the position, it may be the same as the conventional apparatus.

  The pressurized rotary plate type solid-liquid separator according to the present invention can be widely used for dewatering sludge water generated in various wastewater treatment processes.

DESCRIPTION OF SYMBOLS 1 ... Pressurization type rotary plate type solid-liquid separator 2 ... Housing 3 ... Sludge containing water supply pipe 4 ... Separation liquid discharge pipe
5 ... Rotating plate 6 ... Rotating shaft 7 ... Slit bar 8 ... Spacer ring 9 ... Pressure plate 10 ... Pressure mechanism 11 ... Pressure support shaft 12 ... Dehydrated sludge discharge part 13. Dehydrated sludge 14. Dehydrated sludge tank A ... Gravity dewatering part B ... Pressure dewatering part

Claims (5)

Between the multiple slit bars, a rotating plate is rotatably arranged to form an upstream portion and a downstream portion, and a pressure plate is arranged above the rotating plate to add an upstream portion to a gravity dehydrating portion and a downstream portion. A pressure dewatering unit using a pressure plate is rotated by supplying sludge-containing water from the uppermost part of the rotating plate and removing the liquid from the gaps between the rotating plates and the gaps generated in the rotating plates and the slit bar. In a pressurized rotary plate solid-liquid separator that moves dewatered sludge placed on a plate to a gravity dewatering unit and a pressure dewatering unit, and discharges the dewatered sludge from a dewatered sludge discharge unit provided at the most downstream portion. ,
A pressure-type rotating plate type solid-liquid separator characterized in that the number of rotating plates arranged in the pressure dehydrating unit is reduced relative to the number of rotating plates arranged in the gravity dehydrating unit.   The pressure-type rotating plate type solid liquid according to claim 1, wherein the number of rotating plates arranged in the pressure dehydrating unit is in the range of 30% to 70% with respect to the number of rotating plates arranged in the gravity dehydrating unit. Separation device.   The pressure-type rotating plate type solid liquid according to claim 1 or 2, wherein the number of rotating plates arranged in the pressure dewatering unit is in the range of 45% to 55% of the rotating plates arranged in the gravity dehydrating unit. Separation device.   By eliminating every other rotating plate placed before and after the rotating plate in the pressure dehydrating unit, the number of rotating plates arranged in the pressure dehydrating unit is 45% of the rotating plate arranged in the gravity dehydrating unit. The pressurized rotary plate type solid-liquid separator according to claim 3, which is in a range of ˜55%.   5. The pressurized rotary plate type solid-liquid separator according to claim 1, wherein the rotary plate has an elliptical shape, an oval shape, or a rectangular shape with rounded or cut corners.

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