JPS6336805A - Flat membrane device - Google Patents

Abstract

PURPOSE:To enable use of a low-capacity pump and to prevent the clogging of a filter membrane by providing guidance ports alternately staggered from each other to each filter plate, and allowing the raw liq. to meander through the liq. passage gap while changing its course in one direction or another. CONSTITUTION:A lower guidance port 15 corresponding to a lower liq. passage port 11 is provided to an odd-numbered filter plate 6-I, an upper guidance port 16 corresponding to an upper liq. passage port 10 is furnished to an even- numbered filter plate 6-II, and the filter plates 6-I and 6-II are alternately arranged in a line in the longitudinal direction and clamped to form blocks I-IV. The raw liq. supplied through the respective feed holes 17 of a fixed end plate 2 and respective partition plates 5 from a header pipe 19 flows downward through the left liq. passage gap 9' of the left-most filter plate 6-I of each block, passes through the lower guidance port 15, flows upward through the right liq. passage gap of the filter plate and the left liq. passage gap of the second opposed filter plate 6-II, passes through the upper guidance port 16 of the second filter plate, and then flows downward. Concd. water not permeated through a filter membrane 8 is discharged into a header pipe 20 from each discharge hole 18.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention comprises a liquid collecting section in which a filter membrane such as a UF membrane or an RO membrane is stretched, and a filter plate having a liquid passage gap on the surface of the filter membrane. Blocks formed by stacking a plurality of blocks in a row in the front and back direction facing each other at a liquid passage gap are placed under pressure between the front and rear end plates, and the stock solution is allowed to flow through the liquid passage gap of the filter plate in contact with the filter membrane. to separate the stock solution into the furnace liquid that has passed through the filter membrane and the concentrated liquid that has not passed through the filter membrane.

This invention relates to a flat membrane device that performs solid-liquid separation using an operation similar to that of a filter press.

(Prior Art) Such a flat membrane device is known from Japanese Patent Publication No. 52-10113. As shown in Figs. 16 and 17, this conventional device has a single movable end that can be moved along a water support material 4 that is installed between a fixed end plate 2 and a fixed support plate 3 that face each other in the front and back of the bed Ih. Plate 2'; ・One or more partition plates 5, here three partition plates 5...; Positioned between the L-leg fixed end plate 2 and the partition plate, between each partition plate, and between the partition plate and the movable end plate. filter plate 6 for multiple sheets each
..., for example, by tightening the port 7 passed between the fixed end plate 2 and the movable end plate 2' with the nut 7', the partition plate 5... Filter plate 6・
・Pinch the block consisting of ・■.

On the front and rear surfaces of each filter plate 6, a washboard-like liquid collecting recess 8 is formed by recessing two steps inside the peripheral edge made of a gasket, and one step [
A bj membrane 8' covering the liquid collecting recess 8 is stretched around the entire circumference of the first stage to form a liquid collecting part 9, and liquid passage ports 10 and 11 are opened in the upper part and the first part of this stage. Yes, each block, II
, ■, ■ The upper liquid passage port lO of the filter plate 6 for multiple sheets constituting
The comrades and the lower liquid passage ports 11 are connected in series with each liquid passage gap 9' between the opposing filter plates being separated. Each filter plate 6 has an extraction hole 12 through which the filtrate obtained in the liquid collecting recess 8 after passing through the filter membrane 8' is extracted from the periphery of the filter plate.

To perform the separation, the stock solution is supplied by a pump to the liquid supply port 13 of the first block I on the fixed end plate 2, which communicates with the prefecture liquid inlet lO, and between the first block ■ and the second block II. And each partition plate between the third block (■) and the fourth block (■) has a lower relay port 11' that communicates with the lower liquid passage port 11 of each block.
In addition, the part νJ board between the second block ■ and the third block ■ has a northern relay port 10' that communicates with the L connection liquid port IO, and a movable end plate is used. 2' is a drain port 14 that communicates with the upper liquid passage rlIO of the fourth block (■).
will be established.

As a result, the stock solution supplied from the liquid supply port 13 of the fixed end plate 2 to the continuous upper liquid passage port 10 of the first block passes through the liquid passage gap 9' of all the filter plates of the first block to the filter membrane. , and flows in a downward flow.

The filtrate that has passed through the filter membrane and obtained in the liquid collection recess 8 is discharged from the respective extraction holes 12, and the stock solution that has not passed through the filter membrane is transferred from the liquid passage port 11 of the first block to the second block. It flows into the series of lower liquid passage ports 11 of the second block through the lower relay port 11' of the partition plate between them, and contacts the filter membrane through the liquid passage gaps 9' of all the filter plates of the second block. This time, the liquid flows in its own flow, and at this time, the furnace liquid that has passed through the filter membrane and obtained in the liquid collecting recess is discharged to the outside of the filter plate through the extraction hole 12, and the stock liquid that has not passed through is drained to the upper part of the second block. The liquid passes through the upper relay port 10' of the intermediate plate between the first and third blocks, and flows into the series of L section liquid passes nlO of the third block, and this time, in a downward flow, it flows through all the filter plates of the third block. The liquid flows through the liquid passage gap 9' in contact with the filter membrane.

In this way, the liquid that has flowed in the L countercurrent (or decountercurrent) through each liquid passage gap of the previous block in contact with the filter membrane comes into contact with the filter membrane in the liquid passage gap of the next block. It flows in the opposite direction Ii (or L counterflow), and in this way, it repeats the meandering flow in the L downward direction for each block, and flows through the liquid passage gap of the final stage, here the fourth block, fJ511! The concentrated liquid that did not pass through the filter membrane even though it came into contact with
discharge from.

(Problem to be solved by the invention) By the way, in such membrane separation, if the liquid does not flow through the liquid passage gap at a constant flow rate, a concentration of 4i will occur on the surface of the filter membrane, causing The property is that the yield (flux) of the permeated filtrate decreases.

In the conventional example, multiple filter plates are stacked in a line in the front-rear direction to form a block, so in order to obtain the required flow rate that flows through the liquid passage gap of -. filter plates in contact with the filter membrane. Assuming that the amount of stock solution is Q, if 10 fji plates constitute one block, it is necessary to supply the stock solution to 113 with a pump with a large capacity of 10X Q = IOQ, In addition to increasing equipment costs, running costs also increase.

Furthermore, a large amount of the liquid flowing into the continuous upper or lower liquid passage ports 10 of the filter plates constituting each one block is supplied to the liquid passage gaps on the downstream side, and the liquid passage holes 10 on the downstream side are The amount of water supplied to the L-flow side tends to be smaller than that on the downstream side, and the flow velocity in the liquid passage gap on the L flow side becomes smaller.

For this reason, there is also the problem that the filter membrane of the filter plate on the flow side is easily clogged with solid matter in the liquid.

(Means for Solving the Problems) Therefore, the present invention provides a solution for each filter plate which is pinched between the front and rear end plates and constitutes a block, so that the liquid flows in one direction by contacting the filter membrane through the liquid passage gap. The filter plate is characterized by alternately providing guide ports for allowing the unfiltered liquid that has not passed through to flow in the opposite direction to the liquid passage gaps of adjacent filter plates.

(Function) As a result, the liquid passes through the liquid passage gap of the filter plate that makes up the block in contact with the filter membrane and flows in the - direction, and the stock solution that has not passed through the filter membrane passes through the induction port in one of the filter plates. The liquid is guided to the liquid passage gap of the adjacent filter plate, and then flows through the liquid passage gap in the opposite direction in contact with the filter membrane, and thus sequentially flows through the liquid passage gap of all the filter plates constituting the block. It flows in meandering directions, turning in one direction and then the other.

(Example) In each of the illustrated embodiments, the same components as in the conventional example shown in FIGS. 16 and 17 are denoted by the same reference numerals. In addition, in each example, among the plurality of filter plates constituting blocks I, ■,...
Counting from the left, the odd-numbered filter plates will be referred to as 6-I, and the even-numbered filter plates will be referred to as 6-n.

In the first embodiment shown in FIGS. 1 to 7, the odd-numbered filter plate 6-
I has a T-portion inlet 15 corresponding to the conventional filter plate R [111] on the stage where the filter membrane 8' is stretched, and the even-numbered filter plates 6-1 are arranged in the upper part of the conventional filter plate. An L-portion guide port 16 corresponding to the liquid passage port 10 is provided at the stage on which the filter membrane 8' is stretched.

When the filter plates 6-I and 6-TI are stacked and pressed alternately in rows in the front-rear direction to form blocks II, etc., the lower guide port 15 of the filter plate 6-I is adjacent to the filter plate 6-I. The northern part of the filter plate 6-II is located opposite to the lower part of the liquid collection part 9 of the even a-th filter plate 6-■ across the liquid passage gap 9'. They are opposed to each other above the liquid collection part 9 of I with a liquid passage gap in between.

In this embodiment, the fixed end plate 2 and each partition plate 5 are supplied with the stock solution to the upper part of the gap 9'. The movable end plate 2' and each partition plate 5 are provided with a discharge hole 18 for discharging unfiltered concentrated liquid from the liquid passage gap 9' on the right side of the filter plate at the right end of each block. A flexible hose 1 is connected between the undiluted solution ladder pipe 19 that leads the undiluted solution from the pump and each supply hole 17, and between the header pipe 20 that leads the concentrated water and each discharge hole 18.
Connect with 9'..., 20'... The connection was made with a flexible hose in order to allow the operation to be interrupted and the pressure between the end plates to be released, to maintain the distance between the filter plates, and to wash the furnace cloth. .

As a result, the stock solution is transferred to each block I, ■,
..., the stock solution flows downward through the liquid passage gap 9' on the left side of the leftmost filter plate 6-I of each block facing the fixed end plate and the partition plate, and then flows through the lower guide port 15. L flows through the liquid passage gap on the right side of this filter plate and the liquid passage gap on the left side of the second filter plate 6-11 opposite thereto, and passes through the northern induction port 16 of the second filter plate. It escapes and now flows downward.

In this way, the liquid flows alternately in the downward direction through the liquid passage gap between the filter plates of each block, and the L flows as it flows while contacting the filter membrane.

The filtrate (flux) F that passes through the filter membrane 8' and is obtained in the liquid collection section 8 is an outlet! Step 2 to drain the liquid to the outside of each filter plate, and finally from the right side of the rightmost filter plate of the block to the iI
: Discharge the thin ice to the header pipe 20 through the discharge hole 18.

The difference between the second embodiment shown in FIG. 8 and the first embodiment described in L is that the liquid supply hole 17 provided in the fixed end plate 2 is sandwiched between the fixed end plate and the filter plate at the left end of the block. 21, and the drainage hole provided in the movable end plate 2' is provided in the auxiliary plate 22 sandwiched between the movable end plate and the filter plate at the right end of the block (2).

In addition, in the embodiment of FIG. 9, f is used to supply the stock solution to blocks I and II, ■ and ■ on the left and right of every other partition plate 5-r.
A T-shaped liquid supply hole 17 is provided in the partition plate 511 located between the above-mentioned partition plate 5-I. A T-shaped drain hole 18 is provided to drain the concentrated liquid that has not passed through the tube. The concentrated water is discharged from the liquid passage gap on the left side of the filter plate at the left end of the block (2) through the drain hole provided on the fixed end plate 2, and the drain hole on the right side of the block (2) at the right end of the block (opposite to the movable end plate) Concentrated water is discharged from the liquid gap through drainage holes provided in the movable end plates. The auxiliary plate 22 may be used for evacuation.

In this embodiment, the same filter plate 6-I as used in the first embodiment
, 6-II can be used, and even-numbered blocks I1. IV
In this case, the filter plates 6-I and 6-11 are stacked alternately with the same arrangement, but in the odd-numbered block, the partition plate 5 having the liquid supply hole 17 is
-I is the basic school, and counting to the right from this partition plate, the number-th filter plate is 6-I, and the even-numbered filter plate is 6-11.

In this embodiment, one partition plate is used to supply stock solution to the left and right blocks, and to extract concentrated water from the left and right blocks, so the number of flexible hoses used to connect each header pipe 19, 20 and the partition plate is reduced. C halved.

The embodiment shown in FIGS. 10 to 15 is similar to the first embodiment C, but in this embodiment, the L and F portions of the peripheral edges formed by the gaskets of each filter plate 6-I and 6-11 are A liquid passage port 23 for the stock solution and a liquid passage port 24 for the C fine droplet are provided in series, respectively.

Therefore, correspondingly, communication ports 25 and 26 are provided in each partition plate 5 to communicate with the liquid passage ports 23 and 24 of kl', and the second communication port 25 is provided in each block ■, ■... The notch 25', which supplies the stock solution to the liquid passage gap 9' on the left side of the Dj plate 6-I at the left end of In addition, the fixed end plate 2 has a liquid passage port 23 below L.
, J! in the communication port 27, 28 connected to 24 and the liquid passage gap on the left side of the filter plate at the left end of the left end block. I! A notch 27' for supplying the stock solution from the connecting port 27 is connected to the lower liquid passage port 24 in the movable end plate 2', and concentrated water is introduced from the liquid passage gap on the right side of the filter plate at the right end of the right end block. A recess 29 is provided in each case.

As a result, by connecting the stock solution supply pipe 30 from the pump to the second series Afio 27 of the fixed end plate and the concentrated water extraction pipe 31 to the lower communication port 28, all the filtration of each block I, II... The L liquid passage ports 23 and 24 of the plates 6-I and 6-11 are connected to each other via the communication ports 25 and 26 of the partition plate 5, respectively, and the notch 27' of the fixed end plate, each partition plate 5 Notch 25'
From there, the stock solution is supplied to the liquid passage gap on the left side of the filter plate 8-I at the left end of each block I, IT..., and the liquid passage gap between the opposing filter plates in each block is meandered in the downward direction L. 1rJ filtration is carried out, the concentrated water flows through the notch r126' of each partition plate and the recess 29 of the movable end plate 2' to the liquid passage port 24, and can be taken out to the extraction pipe 31 connected to the fixed end plate.

In this embodiment, there is no need to connect the header pipes 19 and 20 of stock solution and concentrated water to the partition plate with flexible hoses +9' and 20' as in the first embodiment.

In each of the embodiments described above, the stock solution is supplied in a downward flow to the liquid passage gap at the tip of the block, but the stock solution is not limited thereto, and may be supplied in a countercurrent.

Further, the tightening for pressing the movable end plate 2' toward the fixed end plate 2 is not limited to bolts and nuts 7, 7', but can also be performed with a piston-cylinder type jack using fluid pressure.

(Effects of the Invention) In this invention, the stock solution flows in contact with the filter membrane while meandering sequentially through the liquid passage gap between the plurality of opposing filter plates constituting one block. Assuming that the amount of stock solution flowing through the liquid passage gaps of the Dj plates to obtain the required flow rate is Q, the number of blocks is QX regardless of the number of filter plates that constitute one block.

Therefore, for example, in the conventional example, if 10 filter plates constitute one block and the number of blocks is 4, the required stock solution is QX
IO (the number of filter plates constituting one block), whereas in the present invention, the number is QX4 (the number of blocks), and while using the same 40 filter plates, a pump with a much smaller capacity can be used, and the equipment can be reduced. Both costs and running costs are low.

Furthermore, since the stock solution flows through the liquid passage gap in the block while being filtered in a meandering manner, the flow rate of the stock liquid flowing through the liquid passage gap on the downstream side decreases compared to the liquid passage gap on the downstream side, but the flow rate Since C is constant, both the filter membrane of the filter plate on the upstream side and the filter membrane of the filter plate on the downstream side are less likely to be clogged with solids in the liquid.

[Brief explanation of drawings]

Figures 1 to 7 are the first embodiment of the present invention; Figure 1 is a schematic explanatory diagram showing the overall cross section; Figures 2 and 3, and Figures 4 and 5 are used for Figure 1. A front view and a cross-sectional view of two types of filter plates; FIGS. 6 and 7 are a front view and a cross-sectional view of the partition plate used in FIG. 1; FIG. 8 is a cross-sectional view of the entire second embodiment of the present invention. Fig. 9 is a schematic explanatory drawing showing the entire cross section of the third embodiment of the present invention, with some parts omitted; Figs.・In the example, the first
Figure 0 is a schematic explanatory diagram showing the overall cross section; Figures 11 and 12
The figures are front views of the two types of filter plates used in Figure 10; Figures 13 and 14 are front views and cross-sectional views of the partition plates used in Figure 1O; Figure 15 is the front view of the two types of filter plates used in Figure 10; FIG. 16 is a side view of the entire conventional device; FIG. 17 is an enlarged sectional view of a part of FIG. , 5 is a partition plate. 6-I, 6-11 are filter plates, 8' is a filter membrane, 9 is a liquid collection part of the filter plate, 9' is a liquid passage gap, 15 and 16 are induction ports, I. II, m, 17 shows a block with a plurality of filter plates. Patent applicant Kuri LII, 1m business Co., Ltd. No. 10
Figure 15 Figure 17

Claims (5)

[Claims] (1) A block consisting of a liquid collection part with a filter membrane stretched over it, and a filter plate having a liquid passage gap on the surface of the filter membrane, stacked in a row in the front and rear direction, facing each other at the liquid passage gap, is arranged in front and rear. In a flat membrane device in which the stock solution is separated into a filtrate that has passed through the filter membrane and a concentrated solution that has not passed through the filter membrane by applying pressure between the end plates of the filter plate and flowing the stock solution in contact with the filter membrane through the liquid passage gap of the filter plate. ; For each filter plate constituting the above block, the liquid passing gap is in contact with the filter membrane and flows in one direction, and the stock solution that has not passed through the filter membrane is flowed in the opposite direction into the liquid passing gap of the adjacent filter plate. A flat membrane device characterized by alternately providing guide ports for flowing water. (2) A flat membrane device according to claim (1), wherein the block is configured between an end plate and a partition plate or between a partition plate and a partition plate. (3) In the flat membrane device according to claim (1) or (2), a liquid supply means for supplying the stock solution to the first liquid passage gap for each block, and a concentrated liquid from the last liquid passage gap. A flat membrane device equipped with a drainage means for discharging liquid. (4) A flat membrane device according to claim (2) or (3), in which an undiluted solution supply means or a concentrated solution drain means is provided on an end plate or a partition plate. (5) In the flat membrane device according to any one of claims (1) to (4), each filter plate has a liquid passage port for configuring a stock solution supply system or a concentrated solution discharge system. A flat membrane device equipped with