JPS5870811A - Oblique flow type ultrafiltration apparatus - Google Patents

Abstract

PURPOSE:To enable available utilization of energy generated by an oblique flow wing, by a method wherein an oblique flow pump is constututed from the oblique flow wing and a tubular diffuser and, just behind said pump, an ultrafiltration filter element is provided to utilize characteristics possessed by the oblique flow wing to a max. extent. CONSTITUTION:Oblique flow wings 2 are attached to a shaft to be mounted in a pump barrel body 4 having a suction port 3 and, to the barrel body 4, a tubular diffuser 5 having a bearing box 7 and a bearing 8 through ribs 6 is connected. The ribs 6 perform rectifying function as stationary wings to the oblique flow wings 2. To the outlet part of the diffuser 5, an attaching frame 10 is provided to accommodate a membrane element 11 in said frame 10. When sewage is sent into a filter apparatus 16 from the inlet thereof and a drive machine 25 is operated, said sewage is flowed into the element as a uniform high velocity stream by the rectifying action of the diffuser 5 while pressurized and the permeate stream is discharged from a discharge port while the unpermeated sewage is subjected to recirculation treatment through a flow passage 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an ultrapolar filtration device for advanced treatment of wastewater.

In the ultrafiltration method, wastewater is passed through p-materials made of polymer membranes at an appropriate flow rate, separating not only suspended solids (8B) in the wastewater but also colloidal particles dissolved in the water. It is a method of purification, and has been widely used in recent years as an advanced treatment for middle-aged water supplies.

There are various shapes of polymer membranes used in this ultrafiltration device, and each is formed based on the arrangement to increase the perturbation rate, but originally this device was made of polymer membranes. Since it is necessary to pass wastewater at a high speed between the formed D members, there is a problem in that the fluid frictional resistance is generally large and the power cost is high.

In order to reduce power loss without impairing the advanced purification function of ultrafiltration, the present invention focuses on the flow method of sewage without being limited to the shape of the door material. The present invention relates to the development of a device that can maximize the use of fluid energy, produce efficient effects, and promote energy savings. That is.

Conventionally, there is a type that distributes and supplies wastewater to a large number of filtration elements, ranging from a single pump installed as a flow generation device for passing wastewater through a polymer membrane element at a desired flow rate. Since the frictional resistance within the piping flow path that occurs during the distribution process is large, it has a particular effect on the loss of outside work force.

Another type is one in which a filtration element and a flow generation device are housed in the same body, and a sewage agitator is used as the flow generation device. This type of device uses a propeller-type stirring blade installed in the center of the fuselage to create a flow of wastewater, which supplies the wastewater to the surrounding filtration element, which causes relatively little power loss. However, there is a problem in that when the filtration element becomes clogged and the agitation flow rate decreases, the power increases.

The present invention has been made in view of these points, and it is an object of the present invention to provide an ultra-P4 pupil that is not greatly affected by the frictional resistance of the flow path when flowing wastewater and whose power does not increase even when the flow rate is small. The purpose is to

Flowing sewage occurs f! - Since the stirring blade used as a pump is also a type of pump, if you examine its flow characteristics as a pump, you will find that the conventional propeller type is indicated by the dashed line H in Figure 1.
As shown by a, the pressure H has a characteristic of rapidly increasing as the flow IQ decreases, and the shaft power also rapidly increases as shown by the broken line La. By analogy with this pump characteristic, it can be seen that the power of a conventional ultrafiltration device with a built-in stirring blade increases as it becomes clogged.

On the other hand, in what is called a mixed flow pump, as shown in Figure 2, which shows a comparison of the axial cross-sectional shapes of the blades, the propeller blades generate a flow parallel to the axis shown by the arrow (A) in Figure 2 + al. In contrast to those that cause mixed flow blades, arrow tel in Figure 1 +b+
), and if we examine its characteristics, we can see that as the flow tQ decreases, the soil texture of the propeller blade increases as the pressure H decreases, as shown by the solid line Hb in Figure 1. Moreover, regarding the most important point, the shaft power LK, it has a preferable characteristic that it does not increase at all, but partially decreases by 1, as shown by the solid line Lb.

The present invention makes full use of the characteristics of the mixed flow blade to form a fluid machine that exhibits high efficiency, and the generated flow is immediately applied to the Kfi passing element to effectively utilize the energy generated by the flow generation device. Its configuration is that a mixed-flow wing that is attached to a shaft and rotates is built in close to the inner wall of the fuselage that has a suction port, and on the trailing side of the mixed-flow wing, there is no airflow from the wing. A tubular diffuser for rectifying the flow is provided to constitute a mixed flow pump as a whole, and one of the tubular diffusers
! [Later, an ultrafiltration element made of a polymer membrane is provided in series over the entire cross section of the 70 flow path, and the flow generated by this mixed flow pump is applied immediately to the Vc filtration element. In order to increase the surface area, polymer membrane elements can be coiled around a porous core, stacked in layers as a flat membrane core, or
! Various shapes, such as rutted fibers and bundles, can be used, but the filtration element must have a mounting frame and must be able to extract treated water, which is membrane permeation liquid, to the outside.

That is, a filtration element mounting frame arranged in series is provided immediately after the tubular diffuser, and the mounting frame is equipped with a box body and an extraction port for extracting treated water. With this configuration, wastewater that does not permeate passes through the filtration elements, so it can be recirculated.

Covering the integrated filtration device body composed of the mixed flow pump, the filtration element, and the mounting frame with a mantle, and forming a circulation flow path between the filtration device body and the mantle to recirculate the wastewater that has passed through. The filtration reaction can be carried out repeatedly. and.

A mounting frame for the filtration element is removed from the outer body, and an opening is provided so that the filtration element can be regenerated. Since the pump part and the filtration element part are arranged in series, they can be installed without interference from the flow generator.

In order to clarify the structure of the present invention, the present invention will be described in detail based on the drawings. Fig. 3 is a longitudinal sectional front view of the apparatus of the present invention, Fig. 4 is a cross-sectional plan view thereof, and Fig. 5 The figure is a longitudinal side view taken along line A-A.

FIG. 6 is the same <B-B longitudinal cross-sectional side view.

In the figure, a mixed flow vane is attached to the shaft, which is built into a pump body having a suction port 3, and connected to the pump body q, where a tubular diffuser 3 is provided.

This diffuser! A bearing box and an underwater bearing t are provided through an appropriate number of radial ripples to support the external bearing t and the common shaft l.

The tubular diffuser j in this embodiment is formed of enlarged tubes with different diameters. That is, the inlet part of the diffuser 30 has a cylindrical shape, and the outlet part has a rectangular shape. The lip 6 not only functions as a support member for the bearing box 7, but also contributes to improving the rectifying function of the diffuser S by serving as a stationary blade for the mixed flow blade, which is a rotor blade, in a desired blade shape. You can also do it.

Next is the diffuser! A transit element mounting frame having the same opening area as the outlet shape is installed in series with the diffuser S to accommodate the ultra-violet element. - Per-Element) // is attached to a box that collects the permeate from the polymer membrane and extracts it to the outside through the circulation of wastewater.
The mounting frame 10K is stored, and the filtered water that is the permeate is stored in the box 1.
It is made to be discharged from the extraction port/3 provided in 2.

(i.e. filtered niremen) // is formed by wrapping a polymer membrane 15 around a porous core /g as shown in Figure 7(a), or as shown in Figure 7(b) Porous core/II with polymer membrane 7.1 laminated, etc.
There is no need to specifically limit the shape, but no matter how much pressure is applied, the surface of the polymer membrane/S tIStt will flow as shown in the figure by the arrow C.
It comprises a first passage f, shown by f, and a second passage shown by an arrow, which permeates and collects in the porous core lda formed on the inner surface of the polymer membrane lj.

The raised structure forms an integral filter body 16 in which the pump portion and the filter element portion are arranged in series.

Then, cover with this filtering device body/4 + mantle body 17.

IC circular flow path between filtration device body L and outer mantle L
form 4. In this example, as shown in FIG.
It is divided into three parts and assembled using flanges. As shown in FIG. q, the diffuser S is integrated with the outer mantle 17, and the p-element mounting frame 10 is also formed integrally with the mantle 17. In addition, there is a mantle l in which the box body to be housed in the filtration element mounting frame 10 is located.
An opening 19 is provided on the side of the filtration element so that a box 1 housing a transitory element can be inserted from the outside and inserted into the filtration element mounting frame IO.

In this practical example, the tS openings 19 are provided at one location on each of the left and right sides K-1i of the mantle 17, and the box housing the filtration membrane (filtration filter) // is formed into a single layer at the top and bottom, and each opening 1
The illustration shows what was inserted from 9 onwards.

The structure may be such that the opening 19 is divided into a large number of parts so that the transient element // can be partially extracted.

Note that in the figure: 10 is an inspection cover provided on the mantle body 17, and 2/ is a sealing member for the shaft l passing through the mantle body 17. This is the inlet of sewage, which is the water to be treated.
is the concentrated sewage outlet. Also, Kohiro is a power transmission device for driving the pump, 2j is a drive machine, and %,
26 is a frame on which these are mounted.

Next, to explain the operation of the apparatus of the present invention configured as described above, sewage as water to be treated is fed from a raw water tank (not shown) into the p-link device body 16 through the sewage inlet 22, and the drive machine 2S is operated. , on the arrows in Figures 3 and q), (
As shown in (b) and (c), the pressure of the inflowing sewage is increased by the pumping action of the diagonal flow impeller A, and it becomes a uniform high-speed flow by the rectifying action of the diffuser S, and immediately becomes a Kfp filter element ll.
flow inward.

The wastewater that has flowed into the box permeates the polymer membrane 15 while passing through the first passage, is collected in the box through the second passage, and is discharged as treated water from the extraction port 13. be discharged. If it is a gray water treatment facility, this treated water will be reused as needed.

On the other hand, the wastewater that has passed through the first passage of the filtration element // exits the filtration device body/6, passes through the circulation channel/gap in the jacket body, and is returned to the mixed flow pump again.

While the sewage is being treated in this way, the sewage in the circulation flow path 1g is concentrated, so it is sometimes extracted from the concentrated sewage discharge loco 3 in the outer shell and sent back to the raw water tank, or the sludge concentration storage tank provided separately. etc. for the next process.

Furthermore, when the polymer membrane/S of the filter element// is also clogged with contaminants in the wastewater, the number of permeate flowers decreases and the circulation flow rate increases, resulting in a decrease in treatment efficiency. As the clogging progresses, the passage resistance in the filter increases, and the flow rate of the mixed flow pump decreases, resulting in a drastic drop in processing efficiency.

If such performance deterioration of the polymer membrane 15 occurs, stop the operation of the pump, remove the filtration element along with the box from the opening 19 from within the mounting frame 10, and clean or remove the filtration element. By replacing it, the P overperformance can be restored and operation can be resumed. In this series of processes, even if the pump flow rate decreases due to clogging of the filtration membrane, the shaft power increases when the flow rate decreases due to the characteristics of the mixed flow pump, as shown by the shaft power Lb in the M/ diagram. On the contrary, it tends to decrease.

As described above, the p-filtration device of the present invention constitutes a complete pump equipped with mixed flow blades and a diffuser within the filtration device, so it can achieve a pump performance that is more efficient than the conventional one using a simple stirring blade. With.

Since power is distributed to the series K filtration element immediately after the diffuser outlet, the fluid energy generated by the pump can be applied directly to the filtration element without wasting it due to unnecessary pipe friction resistance, etc., and the energy generated by the pump can be can be used to the maximum.

In addition, a mixed flow pump part as a wastewater flow generation device,
Since the filtration element parts are arranged adjacent to each other in a straight line, when cleaning or replacing the polymer membrane that is the filtration element, maintenance can be performed without disassembling the flow generator, that is, without any interference. can. In addition, as an embodiment of the present invention, the flow generator and the filtration element are combined into a cartridge type, so that both can be replaced with one touch, making it easy to use! It is also possible to have the following structure.

Furthermore, since the present invention uses a mixed flow pump as the flow generating device, the power cost does not increase due to clogging of the V-filtering element that occurs during the filtration process, and on the contrary, the shaft power tends to decrease. Unlike the conventional method, this method does not have the disadvantage of lowering K filtration efficiency and increasing power cost, and has the practical advantage of having energy-saving characteristics.

[Brief explanation of the drawing]

Figure 1 is a characteristic comparison diagram of flow generators, Figure 1fa)
(b) Comparison diagram of the shape of kl agitation, FIG. 3 shows the diagonal flow f! according to the present invention. li ultrafiltration device, Fig. 5 is a side view of A-AR11i, and Fig. 6 is a longitudinal sectional front view of the ultrafiltration device. Figure fal Ibl is a perspective view for explaining the structure of the filtration element. /... shaft, co... diagonal flow, 3... suction port, q...
・Pump body, S... Diffuser, 6... Radial ribs. 7...Bearing box, r...Underwater bearing, 9...External bearing, 10...Filtering element mounting frame, //...Filtering element, /ko...Box body, 13... Extraction port, L・
... Porous core, 15... Polymer membrane, 16. ...Filtering device body, 17... Mantle body. /Za...Circulation channel, 19...Opening, 20...Inspection cover. Co., Ltd. Shaft seal member, -1. Sewage inlet, Co.3.
・・Concentrated sewage discharge port, COQ・Power transmission device, YuS・
...Driver. Yu6...Frame. Patent applicant: Dengyosha Machinery Co., Ltd. Figure 1 (0%) Figure 2 (a) (b ni (a゛・Figure (b) 69

Claims (1)

[Claims] 1. A mixed flow blade attached to a shaft is provided in the body having a suction port, and a tubular diffuser is provided on the downstream side of the mixed flow blade to constitute a mixed flow pump, and a first passage on the surface side of the polymer membrane is provided. A filtration element having an inner surface and a second passage is housed in a box having an extraction port that communicates only with the second passage, and is arranged in series immediately after the diffuser, and these devices are connected to the first passage. A diagonal flow type limiter covered with a mantle body having a circulation passage leading from the passage to the inlet of the diagonal flow pot, a sewage inlet, and a concentrated sewage discharge port, and an opening S for taking out the filtration element in the mantle. - Passing device.