JPH0790151B2 - Throwing type solid-liquid separator - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates Ri engages the improvement of solid-liquid separation device using a membrane module, in the process the original to fouling water treatment facilities
The present invention relates to a throw-in type solid-liquid separator used for separating water .

[0002]

2. Description of the Related Art In recent years, membrane separation technology utilizing functional membranes has made remarkable progress, and solid-liquid separation devices using various types of functional membranes have been developed. FIG. 8 shows an example of a conventional solid-liquid separator A using a microfiltration membrane as a functional membrane,
The raw water pump P feeds the raw water W from the raw water storage tank T to the membrane module M, takes out the treated water E to the outside, and returns the concentrated water F to the raw water storage tank T through the circulation line C. Further, the membrane module M is of a type in which an ultrafiltration membrane or a microfiltration membrane in which a tubular hollow fiber or a flat membrane is formed in a spiral type is housed inside a tubular shell,
It is a plate type or the like in which flat membranes are laminated, and has significantly superior solid-liquid separation performance as compared with a solid-liquid separation device using ordinary filtration.

Thus, the membrane separation performance of the membrane module M greatly varies depending on the properties of the dense ultrathin layer (that is, the separation active layer having a thickness of about 1 μm or less) formed on the surface of the membrane. For example, when the filtered substance is collected on the membrane surface by ultrafiltration and a gel layer of the filtered substance is formed on the outer surface of the membrane, the separation efficiency of the membrane, especially its water permeability (l / m ² · hr ·
(kg / cm ² ) is significantly reduced, or the filtration substance is adsorbed on the membrane, which causes a problem such as a large change in the fractional particle diameter of the membrane. That is, if clogging or dirt occurs on the membrane surface due to the filtered substance (solute), the membrane separation performance will be greatly deteriorated, and the excellent solid-liquid separation performance of the membrane module M should be fully utilized. Cannot be done.

Therefore, in the solid-liquid separation apparatus using this type of membrane module M, the membrane surface flow velocity in the membrane module M is increased as much as possible, and the membrane surface is contaminated by the filtered substance or the separation active layer. Preventing clogging of the equipment is an essential requirement for maintaining normal operation of the equipment. In other words, it is necessary to increase the flow velocity of the raw water W in the membrane module M and always keep the raw water W flowing in the module M and near the membrane surface in a turbulent state. In this case,
Of course, the upper limit of the flow rate of raw water is limited by the strength of the membrane, the structure of the membrane module M, etc. However, it is preferable to set the flow velocity as high as possible in order to prevent the membrane surface from being contaminated or blocked. It is convenient.

By the way, when the raw water W having a constant volume is treated by the so-called one-pass method, the amount of the raw water W supplied to the membrane module M is restricted by the treatment capacity of the membrane module M, and the membrane module M is limited. It is difficult to set the flow velocity of the raw water in the inside sufficiently high. for that reason,
In the solid-liquid separation device using the membrane module M, a so-called circulation treatment system in which a circulation line C is provided is usually used as shown in FIG. 8 , and a considerable amount of raw water W is added in order to increase the flow velocity in the membrane module M. In addition to supplying the raw water into the membrane module M, the surplus raw water (that is, the concentrated water F having a low treatment level) is returned to the raw water storage tank T.

However, in the conventional solid-liquid separation apparatus of the circulation treatment system as shown in FIG. 8 , since the circulation line C is required, the structure of the solid-liquid separation apparatus becomes complicated, and the apparatus is simplified and made compact. There is a drawback that it is difficult to achieve. Further, when the amount of raw water supplied to the membrane module M increases, the pipe diameter inevitably increases, the energy consumption of the raw water pump P also increases, and the running cost of the device increases. Further, in order to continuously operate the device while maintaining the membrane surface velocity in the membrane module M within a predetermined range, a sophisticated operation control device and excellent operation technology are required, and the equipment cost is reduced. There is a problem that it is difficult to reduce operating costs.

[0007]

DISCLOSURE OF THE INVENTION The present invention has the above-mentioned problems in the solid-liquid separation device using the conventional membrane module, that is, the structure of the device is complicated, and it is difficult to downsize the device, and energy consumption is reduced. Is difficult to reduce,
It aims to solve problems such as difficulty in reducing equipment costs, which requires advanced control equipment and advanced operation technology.The structure is extremely simple and excellent separation performance is always stable. The present invention provides a throwing-type solid-liquid separating device.

[0008]

The present invention is a submersible pump.
1 and a membrane module 2 directly connected to the discharge port of the submersible pump 1.
Of the sewage treatment facility consisting of
In the throw-in type solid-liquid separation device used, the membrane module
Tool 2, the raw water inlet 3a on the bottom and the upper side
A substantially conical shell 3 having a concentrated water outlet 3b;
A substantially conical spacer 12 disposed inside the shell 3.
And disposed in the gap between the shell 3 and the spacer 12.
Microfiltration membrane 4 and treated raw water provided at the concentrated water outlet 3b
W pressure adjusting throttle portion 3d and treated raw water of the shell 3
Consists of a cleaning air blowing port provided near the inlet 3a
Then, blow air into the filtration membrane by
The cleaning is the basic configuration of the invention.

[0009]

[Operation] The solid-liquid separation device is thrown into the raw water and the submersible pump is operated. As a result, raw water having a predetermined flow rate and pressure is supplied into the membrane module and is divided into treated water and concentrated water. Treated water removed of solid body content Ri by the membrane module, punished
The concentrated water, which is discharged from the raw water tank to the outside and contains a large amount of solids, is directly discharged from the membrane module into the raw water tank. Since a predetermined amount of raw water is supplied into the membrane module, the flow rate of the raw water inside is maintained at a predetermined value. As a result, clogging and dirt on the film surface are completely prevented,
High membrane separation performance is maintained. Further, since the concentrated water is discharged directly into the raw water from the membrane module, the pump power cost is significantly reduced as compared with the conventional circulation type device. Further, since the membrane module is directly connected to the discharge port of the submersible pump, the size of the device is significantly smaller than that of the conventional circulation type device, and the operation management is simple and easy.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a throw-type solid-liquid separation device related to the present invention, and FIG. 2 is a front view in which a part of a membrane module used in the device of FIG. 1 is cut away. 1 and 2, A is a throwing solid-liquid separator, 1 is a submersible pump,
Reference numeral 2 denotes a membrane module, and the present invention is configured by directly connecting the membrane module 2 to the discharge port side of the submersible pump 1.

The submersible pump 1 may be of any type, and its discharge pressure is about 0. 0 from the viewpoint of ensuring a driving force for separating raw water in the membrane module 2.
A discharge pressure of about ² to 1.5 kg / cm ² is required. In addition, the discharge amount depends on the required amount of treated water and the membrane module 2.
It is determined from the at film surface velocity within, here, the highest discharge pressure 1.0 kg / cm ^2, discharge rate 600 l / min,
A 2.2 kW submersible centrifugal pump is used.

As shown in FIG. 2, the membrane module 2 is composed of a cylindrical shell 3 and a capillary tube type microfiltration membrane 4 and the like housed in the shell 3, and the shell 3 is treated.
A raw water inlet 3a, a concentrated water outlet 3b, a treated water outlet 3c, etc. are provided. Also, the concentrated water outlet 3b of the shell 3
Is provided with a throttle portion 3d for adjusting the pressure of the raw water W flowing in the shell 3. In addition, 3e is an adhesion part of the microfiltration membrane.

As the microfiltration membrane 4, a so-called capillary tube type microfiltration membrane is used. That is, here, the fractional particle size is 100 nm and the water permeation rate is 650 to 1050 (l.
/ M ² · hr · kg / cm ² ) A microfiltration membrane having a separation performance of about 80 l / min is used when the inlet raw water pressure is 1 kg / cm ² and the raw water inflow rate is 600 l / min. The treated water E is obtained. Although a tubular microfiltration membrane is used as the filtration membrane here , the microfiltration membrane may be a flat membrane, a hollow fiber, or a spiral membrane, and the membrane module 2
The shape of is not limited to a tubular shape. Also here
Although using microfiltration membrane as a filtration membrane, preferably is ideal filtration membrane capable separation of particles having a particle size of up to about 0.005 .mu.m, using better ultrafiltration module separation performance It is also possible.

[0014] Figures 3 and 4 show an embodiment of a membrane module 2 used in the present invention. In the membrane module 2, the spacer 12 is arranged inside the shell 3 having a substantially conical shape, and the capillary tube type microfiltration membrane 4 is provided in the gap between the shell 3 and the spacer 12 to support the membrane fixing. It is supported and fixed via 13. Further, in FIGS. 3 and 4, 3a is an inlet for treated raw water , 3b is an outlet for concentrated water, 3c is an outlet for treated water, 3d is a throttle portion, and 3e is an adhesive portion.

In the throwing-type solid-liquid separation device, one pump 1 is connected to one membrane module 2, but one pump 1 is provided with a plurality of membrane modules 2. Needless to say, the structure may be connected in parallel or in series. Further, in the membrane module 2 of FIGS. 2 and 3, the cleaning mechanism for the microfiltration membrane 4 is not shown, but an air blowing port for cleaning is provided at the module inlet.
The microfiltration membrane is cleaned by blowing air at regular intervals .

Next, the operation of the throw-in type solid-liquid separator A of the present invention will be described. First, the solid-liquid separator A is immersed in the treated raw water W. Next, electric power is supplied to the submersible pump 1 from an engine generator or the like to start the pump 1. The raw water W pressurized by the pump 1 flows into the shell 3 through the raw water inlet 3a of the membrane module 2 from the pump outlet, and while flowing through the shell 3, moisture permeates the membrane wall and the microfiltration membrane 4 It flows into the inside and is discharged outside as treated water E from the treated water outlet 3c. Further, the concentrated water F flowing through the shell 3 is guided to the concentrated water outlet 3b and is directly discharged into the raw water W stored in a pond or the like. Incidentally, the shell 3
Since a concentrated portion 3d is provided at the concentrated water outlet 3b of
A predetermined resistance is added to the discharged concentrated water F. As a result, the raw water W in the shell 3 holds the pressure required for solid-liquid separation.

FIG . 5 shows a case where the throwing-type solid-liquid separation device according to the present invention is applied to a sewage treatment device by an activated sludge method. In FIG. 6, 5 is a sand settling tank, 6 is an adjusting tank, 7 is an aeration tank, 8 is a disinfecting tank, and 9 is a blower. , Where the aeration process is performed. The mixture of treated water and activated sludge in the aeration tank 7 that has undergone aeration treatment is separated into sludge and treated water E by the solid-liquid separator A, and the treated water E is discharged to the outside through the disinfection tank 8. The concentrated water F containing a large amount of the separated activated sludge is returned to the aeration tank 7.

By using the solid-liquid separator A of the present invention, a sedimentation tank (not shown), which is indispensable for the conventional activated sludge type sewage treatment apparatus, becomes unnecessary, and it flows into the disinfection tank 8. The water quality of the treated water E is remarkably clean, and the disinfection tank 8 can be deleted. Further, since the throw-in type solid-liquid separation device A of the present invention only needs to be put into the aeration tank 7, the structure inside the aeration tank does not become particularly complicated. Further, the operation of the solid-liquid separation device A can be performed simply by activating the submersible motor 1, and compared with the conventional case where a part of the activated sludge is returned from the settling tank to the aeration tank while being controlled, the sewage treatment apparatus. Operation management of is extremely easy. In addition, when the activated sludge mixture is separated, a large amount of suspended matter is contained in water, which may cause clogging in a normal membrane module. However, as shown in FIG. 3, it was confirmed that the blockage can be effectively prevented by using a membrane module having a structure in which capillary tube type membranes are regularly arranged between a conical shell and a conical spacer. Has been done.
Of course, the solid-liquid separation device A of the present invention can be applied not only to the aerobic treatment device as shown in FIG. 5 but also to an anaerobic treatment device, a bioreactor or the like.

FIG . 6 shows another example related to the present invention , in which the submersible pump 1 and the membrane module 2 are vertically combined in series. Further, FIG. 7 relates to the present invention .
FIG. 11 shows still another example in which the guide posts 11 are provided.
By lowering the module 2 along a, the submersible pump 1 and the membrane module 2 can be detachably connected in water via the submersible attaching / detaching mechanism. still,
Although the membrane module 2 is detachably connected to the pump 1 in FIG. 7 , the pump 1 can be detachably connected to the membrane module 2. In addition, the solid-liquid of FIG.
The separation apparatus A is a type mainly adopted in an apparatus that mainly uses a large membrane module 2 having a large throughput.

[0020]

According to the present invention, the membrane module 2 is directly connected to the discharge port side of the submersible pump 1 and the combined unit of the submersible pump and the membrane module 2 is immersed in the treated raw water tank to form the membrane module 2 The concentrated water F from the above is directly discharged into the treated raw water tank . As a result, the concentrated water circulation line C required in the conventional solid-liquid separation device becomes unnecessary,
The device can be made much smaller and more compact, and the power consumption required to circulate the concentrated water is not required, and the energy consumption can be greatly reduced. In addition, the membrane surface flow velocity of the raw water in the membrane module is easily maintained at the required high speed as in the case of the conventional solid-liquid separator, so that the separation performance due to clogging or contamination of the membrane surface can be reduced. Almost no deterioration,
Stable solid-liquid separation becomes possible. Furthermore, the device can be operated without requiring any special operation technique simply by starting the submersible pump, and the operation management becomes extremely easy. As the present invention described above, in that say to allow ease of small compact solid-liquid separator and the operation management state, and are not exhibits an excellent practical effects, in the activated sludge sewage treatment apparatus It has a particularly excellent effect in separating sludge from treated water.

[Brief description of drawings]

FIG. 1 is a front view of a throw-type solid-liquid separation device related to the present invention.

2 is a front view of a partially cutaway of the membrane module used in Figure 1.

FIG. 3 is a vertical sectional view showing an embodiment of a membrane module used in the present invention.

FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 is another usage explanatory diagram of the throw-in type solid-liquid separation device according to the present invention.

FIG. 6 is a front view showing another example of the solid-liquid separation device related to the present invention.

FIG. 7 is a front view showing still another example of the solid-liquid separation device related to the present invention.

FIG. 8 is a configuration diagram of a solid-liquid separation device using a conventional membrane module.

[Explanation of symbols]

A is a throwing solid-liquid separator, W is treated raw water , E is treated water, F is concentrated water, 1 is a submersible pump, 2 is a membrane module,
3 is a shell, 3a is a raw water inlet, 3b is a concentrated water outlet, 3c
Is a treated water outlet, 3d is a constriction part, 3e is an adhesive part, 4 is a microfiltration membrane, 5 is a sand tank, 6 is an adjusting tank, 7 is an aeration tank, 8 is a disinfection tank, 9 is a blower, 10 is inflowing wastewater, 11 is an underwater attachment / detachment mechanism, 12 is a spacer, and 13 is a membrane fixing support.

Claims (1)

[Claims] 1. A submersible pump (1) and the submersible pump (1)
Throw consisting of membrane module (2) directly connected to the discharge port of
In a solid-liquid separation device, the membrane module (2)
, The treated raw water inlet (3a) is concentrated on the bottom side
A substantially conical shell (3) having a water outlet (3b),
A substantially conical space disposed inside the shell (3)
A shell (12), the shell (3) and a spacer (12)
Microfiltration membrane (4) arranged in the gap of the
Throttle for pressure adjustment of treated raw water (W) provided at the mouth (3b)
(3d) and the treated raw water inlet (3a) of the shell (3)
And a cleaning air blowing port provided near the
The filtration membrane is washed by blowing air from the blowing port.
The state of being immersed in the treated raw water of the sewage treatment facility
In use to throw type solid-liquid separator.