KR101526884B1 - System of drinking water treatment using immersed membranes - Google Patents

Abstract

The present invention relates to a system for performing a water treatment using an immersion type membrane apparatus, comprising: a mixing and agglomeration process for mixing and agglomerating a flocculant in influent water; A precipitation step of precipitating flocculation treatment water by mixing and flocculating process through a settling plate sedimentation tank in a sedimentation tank provided with a swash plate sedimentation basin; And a membrane filtration step of filtering the precipitated water by the precipitation step by means of a hollow fiber membrane of a submerged membrane device in a membrane separation membrane provided with an immersion membrane device.

Submerged Membrane Device, Hollow Fiber Membrane, Water Treatment System, Swashplate Settler.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a water treatment system using immersion membrane,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system for performing a purification treatment using a submerged membrane device.

As shown in FIG. 1, the conventional water treatment system includes a process of collecting influent water, mixing and coagulating the flocculant, precipitating aggregates or particulate pollutants through a large-sized settling tank, and sand filtration We could get the integer through. When an elevation treatment is required here, as shown in Fig. 2, purified water can be obtained through advanced treatment such as oxidation (ozone) treatment or activated carbon treatment.

However, in recent years, there has been a demand for a water treatment process using a submerged membrane device including a hollow fiber membrane in a water treatment process due to an increase in demand for water treatment.

The water treatment process using the submerged membrane device including a hollow fiber membrane has many merits as a method of performing solid-liquid separation using a membrane of a hollow fiber membrane as compared with a separation method using heating or phase change. One of them is to increase the reliability of the process because it can stably obtain the desired treated water of a desired quality according to the pore size of the separation membrane.

Due to these advantages, separation membranes are widely used in the fields of waste water treatment, industrial wastewater treatment, drinking water treatment, and separation processes in pharmaceutical and industrial fields, and the application range thereof is gradually increasing.

One of the solid-liquid separation methods using the separation membrane is a hollow fiber membrane module in which a plurality of hollow fiber membranes are formed. In one of the hollow fiber membrane modules, the hollow fiber membrane is directly immersed in a fluid water tank to be treated, There is a submerged hollow fiber membrane module in which a fluid is passed through a hollow fiber by applying a vacuum to separate a solid solution.

The submerged hollow fiber membrane module can lower the manufacturing cost of the module and does not require facilities for circulation of the fluid, which is advantageous in that the facility cost and the operation cost can be reduced.

An object of the present invention is to provide a water treatment system using a submerged membrane device capable of long-term use of the submerged membrane device in a membrane filtration process and having improved sedimentation efficiency even when the area of the sedimentation filter becomes narrower, and the filtration efficiency can be improved.

Another object of the present invention is to provide a water treatment system using an immersion type membrane device capable of preventing the concentration of contaminants in a membrane separation tank while continuously producing membrane filtration water by suction in a membrane filtration process using an immersion separation membrane apparatus .

Another object of the present invention is to provide a water treatment system using a submerged membrane device capable of continuously maintaining the filtration efficiency of the submerged membrane membrane device at a predetermined level or more without an excessive load being applied to the filtration capacity of the submerged membrane membrane device.

The water treatment system using the submerged membrane device according to an embodiment of the present invention includes a mixing and agglomeration process in which an aggregating agent is agglomerated in an influent water; A precipitation step of precipitating flocculation treatment water by mixing and flocculating process through a settling plate sedimentation tank in a sedimentation tank provided with a swash plate sedimentation basin; And a membrane filtering step of filtering the precipitated water by the precipitation step by means of the hollow fiber membrane of the immersion type membrane apparatus in the membrane separation tank provided with the immersion type separation membrane apparatus.

Here, the swash plate sedimentation tank is composed of a waterproof bottom surface and a wall surface, a sedimentation zone mold having a coagulated milk feed inlet on one wall and a treated water outlet on the opposite wall, and an agglomeration- A plurality of wafers each having a width in a section parallel to the wall surface on which the treated water discharge port is provided are formed at regular intervals and each of the wafers is formed to be long along a direction perpendicular to the wall surface on which the coagulation- And a plurality of sloping sedimentation modules spaced apart from the bottom of the sedimentation space frame.

That is, precipitating efficiency of the sedimentation basin can be greatly improved by precipitating the flocculating material or the particulate contaminant contained in the flocculation treatment water through the ascending plate sedimentation bed installed in the sedimentation tank in the sedimentation process. By precipitating the flocculation treatment water through the inclined plate sedimentation tank, the turbidity of the sedimentation treated water that has undergone precipitation treatment can be controlled to be 5 NTU or less even when the turbidity of the influent raw water is higher than 50 NTU or 100 NTU or higher. , And 1 ± 0.8 NTU for the input of 10 NTU, it is possible to use the submerged membrane device for a long time in the downstream membrane filtration process and improve the filtration efficiency.

The slope sedimentation modules of the slope plate sedimentation basin have a plurality of slope plates which are arranged at regular intervals and are installed so as to be inclined with respect to the water surface, and both sides of the slope plate are connected to each other, A plurality of process water collectors provided at the upper portion of the swash plate to extend in a direction crossing the swash plate to collect the process water, And an overflow preventing edge connected to an upper portion of the side plate and the front and rear swash plates to prevent the inflow of raw water into the collector.

In the upper end portion of each swash plate, diffusion projections for imparting water passage frictional resistance are provided so as to be evenly distributed over the entire width of the swash plate, and the diffusion projections are formed in triangular, semicircular, semi-elliptical, It is more preferable to have a cross-sectional shape.

The water treatment system using the immersion type membrane separation apparatus according to an embodiment of the present invention includes a separation membrane immersion step of immersing the immersion type separation membrane apparatus in the precipitation treatment water by supplementing the precipitation treatment water in the separation membrane tank provided with the immersion type membrane separation apparatus; A sucking step of sucking the filtered water through the hollow fiber membrane of the submerged membrane device to filter the sedimentation water in the membrane module; A resting step of stopping the process of sucking the filtered water through the hollow fiber membrane of the submerged membrane separation apparatus and filtering the sedimentation water of the separation membrane set; And a separation membrane tank discharging step of discharging the sedimentation treatment water in the separation membrane tank. The separation membrane tank discharging process is performed after the suction process and the pausing process are repeated 1 to 20 times in succession. After the separation membrane tank discharging process, Is performed. Here, the submerged membrane device preferably includes a vertical hollow fiber membrane.

That is, the dipping type membrane device including the vertical hollow fiber membrane is immersed in the water of sedimentation treatment in the separation membrane bath, and the dredging process in which the suction process and the suction process are stopped for a certain period of time is repeated 1 to 20 times Therefore, the filtration efficiency of the submerged membrane separation membrane apparatus including the vertical hollow fiber membrane is not excessively loaded, and the filtration efficiency of the submersible membrane separation apparatus can be maintained at a constant level or higher.

After the aspiration process and the pausing process are repeated 1 to 20 times, the sedimentation treatment water in the separation membrane bath is discharged (preferably completely discharged), and then the membrane membrane immersion process is performed again, Can be prevented. At this time, a backwash process is performed in which the filtered water is injected into the hollow fiber membrane through the suction line immediately before the settling water in the membrane separation tank is discharged, and then the treated water in the membrane separation tank is discharged, Can be removed.

The hollow fiber membrane of an immersion type separation membrane device used in the water purification system using the immersion type separation membrane device according to one embodiment of the present invention is not less than this crude floor area ratio (the ratio of the filtration elements by volume of the hollow fiber membrane unit surface area) 2.0 × 10 ^-3 m desirable. That is, with the integrated low-immersion type separation membrane device, the actions that are defined on the total volume of the precipitation process can be supplemented with a separator tank flows divided by the total surface area of the hollow fiber membrane is installed in an immersion type membrane unit floor area ratio that is more than 2.0 × 10 ^-3 m The suction process and the pausing process are repeatedly performed 1 to 20 times and then the membrane separation process and the membrane separation process are performed so that the filtration capacity of the separation membrane separation device is not excessively loaded, The material is not concentrated, and the filtration efficiency and service life of the submerged membrane device can be improved.

In the water treatment system using the immersion type membrane apparatus according to an embodiment of the present invention, the suction time of the suction process is preferably 10 to 50 minutes, and the rest period of the rest period may be 0.15 to 2 minutes. By setting the suction time to a maximum of 50 minutes or less and the resting time to a minimum of 0.15 minutes or more, an excessive filtration load is applied to the hollow fiber membrane of the submerged membrane device to prevent the hollow fiber membrane from being damaged, So that the filtration efficiency by suction can be improved. In addition, by setting the suction time to at least 10 minutes and the resting time to a maximum of 2 minutes or less, the minimum filtering operation time by suction can be ensured.

In the water treatment system using the submerged membrane separation apparatus according to an embodiment of the present invention, after the separation membrane sedimentation process, an air pressure injection process is performed in which the outer surface of the hollow fiber membrane of the submerged separation membrane apparatus is injected at an air pressure of 150-400 m / . That is, it is possible to prevent the concentration of contaminants in the separation membrane bath by discharging the concentrated contaminants to the inside of the separation membrane bath through the separation membrane bath discharging process at a time. At this time, the external surface of the hollow fiber membrane is heated to 150 to 400 m / By injecting the air pressure, contaminants concentrated on the outer surface of the hollow fiber membrane can be removed to further improve the filtration efficiency of the hollow fiber membrane.

In the water treatment system using the immersion type membrane apparatus according to an embodiment of the present invention, the washing step further comprises a washing step of washing the hollow fiber membrane of the immersion type membrane apparatus using a cleaning agent, wherein the washing step is performed from the membrane- 10 to 200 times It is preferable to carry out this after repeating.

That is, after the repeating of the separation membrane immersion process, the suction and the restoration process, and the whole process of separating membrane separation process are repeated about 10 to 200 times, the contaminants on the surface of the hollow fiber membrane of the submerged separation membrane device are cleaned by the cleaning agent, The filtration efficiency and service life of the filter can be improved. At this time, by making the total process from the separation membrane immersion step to the separation membrane preparation step up to 200 times or less, the hollow fiber membrane is cleaned by the cleaning agent before the damage to the construction film is caused by the contaminants on the surface of the hollow fiber membrane You can.

The cleaning step includes a cleaning agent injection step of injecting a cleaning agent into the separation membrane through the hollow fiber membrane of the submerged separation membrane device, a first maintenance step of maintaining the cleaning agent for 2 to 10 minutes in a state where the injection of the cleaning agent is completed, A cleaning agent replenishing step of injecting the cleaning agent for a time of 30 to 120 seconds after the first maintenance step and a second maintenance step of maintaining the cleaning agent for 2 to 10 minutes after the cleaning agent is replenished, The second maintenance step preferably includes a cleaning agent discharging step for completely discharging the cleaning agent after repeatedly performing the cleaning operation two to five times.

That is, the effect of filling the chemical injection line and the inside of the hollow fiber membrane with the cleaning agent can be obtained through the first maintenance step in which the cleaning agent injection into the hollow fiber membrane of the submerged membrane separation device is completed for 2 to 10 minutes, After the first maintenance step, the cleaning agent is supplementally injected for 30 to 120 seconds and maintained for 2 to 10 minutes. This step is repeated two to five times to obtain an additional cleaning effect by the cleaning agent on the hollow fiber membrane of the submerged membrane separation device You can get it.

After the cleaning chemical replenishment step and the second maintenance step are repeated 2 to 5 times, the cleaning agent is completely discharged to complete the cleaning step, and then the separation membrane immersion step is performed.

After the separation membrane filtration process, highly purified purified water can be obtained by further performing oxidation (ozone) treatment or activated carbon treatment for advanced treatment of purified water.

The present invention provides a water treatment system using an immersion type membrane device capable of long-term use of the immersion type membrane device in the membrane filtration process and improving filtration efficiency, even when the area of the settling paper becomes narrow.

Accordingly, when the conventional water treatment facility is modified to install the submerged membrane separation apparatus, the rear end space of the existing sedimentation basin is divided and used as a membrane separation tank to solve the problems that the sedimentation area of the sedimentation basin is narrowed, The sedimentation efficiency is improved even when the area of the sedimentation paper becomes narrow, so that the filtration process using the submerged membrane separation device can be performed smoothly.

The present invention also provides a water treatment system using an immersion type membrane device capable of preventing the concentration of contaminants in the membrane separation tank while continuously producing membrane filtration water by suction in the membrane filtration process using the immersion separation membrane apparatus.

In addition, the present invention provides a water treatment system using an immersion type membrane device capable of constantly maintaining the filtration efficiency of the immersion type membrane device at a certain level or more without an excessive load being applied to the filtration capability of the immersion type membrane device.

Hereinafter, a specific embodiment for carrying out the present invention will be described with reference to the drawings.

The water treatment system using the submerged membrane separation apparatus according to the embodiment of the present invention is characterized in that raw water to be introduced is once collected in a water collecting tank and mixed with the flocculating agent in a mixing tank, Then, the coagulated water having undergone the coagulation treatment in the coagulation tank is introduced into a settling tank provided with a swash plate settling tank, and the coagulated or particulate polluted material is settled through the swash plate settling tank. The purified water can be purified by introducing sedimentation rotor-settling water into a membrane separator equipped with an immersion-type separator, filtering the membrane through an immersion-type separator, and performing an advanced treatment with ozone and / or activated carbon have.

As an embodiment of the present invention, a swash plate settler disposed in a settling tank will be described in detail. Hereinafter, the side into which the flocculation treatment water flows is referred to as the front side or the front side, and the side to which the sedimentation treatment water is discharged is referred to as the rear side or the rear side.

As shown in FIGS. 4 to 7, an inclined plate settler according to an embodiment of the present invention includes a settling zone frame 10, a plurality of inclined precipitation modules 10 disposed in the settling zone frame 10, (20).

It is preferable that the sedimentation zone frame 10 is formed in a box shape in which an upper surface is opened into a space where sedimentation is performed, and the bottom surface 12 and the wall surface 14 are waterproofed to prevent water leakage.

As shown in Fig. 6, the wall 14 of one side (front side) of the sedimentation zone frame 10 is provided with an aggregate mystery feeding inlet 15 into which raw water having undergone the mixing and coagulation process as a whole is introduced, (Rear side) wall surface 14 is provided with a treated water discharge port 16 through which process water having settled solid matter is discharged in a post-process.

The sedimentation zone frame 10 is made of a concrete or the like. Although not shown in the drawing, a sludge discharging means for collecting and discharging solid substances (sludge) 2 to be settled is installed on the bottom surface 12 side of the sedimentation zone frame 10. Since the sludge discharging means can be implemented by applying various known structures used in conventional sedimentation basin, a detailed description thereof will be omitted.

The slope sedimentation module 20 is installed at a distance from the bottom surface 12 of the sedimentation zone frame 10, as shown in FIGS.

A horizontal support 80 for supporting the slope sedimentation module 20 across the opposing wall surfaces 14 of the sedimentation zone frame 10 is installed at regular intervals.

As described above, since the inclined sedimentation module 20 is installed at a distance from the bottom surface 12, the solid matter (sludge) 2 precipitated is effectively discharged to the bottom surface 12.

4 and 5, the inclined precipitation module 20 includes a wall surface 14 (or a wall surface on which a treated water discharge port 16 is provided) on which the coagulating liquid feeding inlet 15 of the precipitation section frame 10 is installed (14) are arranged at regular intervals and arranged in a plurality. For example, the slope sedimentation module 20 is installed at a predetermined interval of 2 to 10 in the width direction of the sedimentation zone frame 10.

The slope sedimentation module 20 is installed in the sedimentation zone frame 10 along the direction perpendicular to the wall surface 14 (or the wall surface 14 where the treated water outlet port 16 is installed) in which the sedimentation feeding inlet 15 of the sedimentation zone frame 10 is installed And is formed to be long. For example, the slope sedimentation module 20 is formed to have a length corresponding to the length of the sedimentation zone frame 10.

As shown in FIGS. 4 to 6, the inclined precipitating module 20 includes a plurality of swash plates 22 arranged at regular intervals, and a pair of side plates 24 connecting and closing both sides of the swash plate .

The swash plate 22 is installed inclined with respect to the water surface.

The swash plate 22 is installed such that the upper end thereof is inclined in a direction away from the coalescence-detection feeding inlet 15 (in a direction away from the front side).

The swash plate 22 is preferably inclined at an inclination angle of 45 to 75 degrees with respect to the water surface, and more preferably, inclined at an inclination angle of 60 degrees with respect to the water surface. If the angle formed between the swash plate 22 and the water surface is too small, there is a problem that the sedimentation area in contact with the raw water is increased, but the solid material (sludge) is not discharged smoothly. (Sludge) is discharged smoothly, but there is a problem that the sedimentation area in contact with the raw water is reduced.

The swash plates 22 are arranged in parallel to each other at regular intervals (for example, 30 to 80 mm).

The pair of side plates 24 forms a rim of the inclined precipitating module 20 together with the swash plate 22 located at the foremost (front side) and the swash plate 22 located at the rear (rear side) of the swash plate 22 .

Both ends of the swash plate 22 are fixed to the side plate 24 and supported.

The upper surface and the lower surface corresponding to the gap between the swash plate 22 and the swash plate 22 are formed in an open state so that raw water and process water can freely flow.

Both side surfaces corresponding to the gap between the swash plate 22 and the swash plate 22 are configured to be closed by the side plate 24. [

As shown in FIGS. 4 and 6, at the lower end of the side plate 24, a large number of inflow holes 25 into which raw water flows are formed at intervals corresponding to the intervals between the swash plates 22.

The flow of the solid material (sludge) 2 (indicated by the dotted arrow in the figure) descending along the swash plate 22 is prevented by forming the inlet hole 25 at a position closer to the rear than the front face of each swash plate 22. [ And the flow of raw water rising along the swash plate 22 (indicated by solid arrows in the figure) collide with each other can be minimized.

The inlet holes 25 are formed by arranging about 1 to 5 inclined directions for each interval between the inclined plates 22.

The inlet hole 25 may be formed in a variety of holes such as a circle, an ellipse, or a square, or may be formed in a slit shape.

When the inflow hole 25 is formed at the lower end of the side plate 24 as described above, the raw water is not only introduced into only the lower surface (bottom surface) of the swash plate 24 but also flows from the side surface. Can be minimized, and even distribution of raw water is achieved.

It is preferable that the lower end surface of the swash plate 22 is formed in a corner free from unevenness so as to prevent the discharge of the solid material (sludge) descending along the entire surface, and it is also possible to bend the edge surface of the lower end surface toward the rear surface Do.

Although not shown in the drawing, when the edge of the lower end of the swash plate 22 is bent toward the rear side, the strength in the width direction of the swash plate 22 is reinforced to maintain the flatness effectively.

As shown in Fig. 6, the diffusion protrusions 30, which apply the water passage frictional resistance such that the upwardly flowed water is evenly distributed over the entire width of the swash plate 22, are provided at the upper end of each swash plate 22, Direction.

The diffusion protrusions (30) are provided on the back surface side of each swash plate (22).

The diffusion protrusions 30 are formed to have a cross-sectional shape such as a triangular shape, a semicircular shape, a semi-elliptical shape, or a trapezoidal shape.

As described above, when the diffusion protrusions 30 are provided, the treated water is subjected to resistance in the flow direction by the diffusion protrusions 30, and the treated water is widely dispersed and evenly distributed in the process of crossing the diffusion protrusions 30.

When the diffusion protrusions 30 are provided as described above, the strength in the width direction of the swash plate 22 is reinforced and the flatness can be effectively maintained.

The diffusive projection 30 may be formed as a separate member and integrally attached to the swash plate 22, or a part of the upper end of the swash plate 22 may be formed by bending.

As shown in FIG. 7, the inclination settling module 20 includes a side wall 24 and an inclined plate 22 connected to the upper portion of the side plate 24 and the front and rear inclined plates 22 in order to prevent the inflow of raw water to the upper side of the inclined plate 22. And a frame (28).

The overflow preventing rim 28 is formed by forming a strip having a predetermined width in a rectangle shape in one direction and attaching it integrally to the upper side of the side plate 24 and the front and rear swing plate 22.

7 and 8, the inclined precipitating module 20 further includes a treated water collector 40 installed at an upper portion of the swash plate 22 at intervals.

The treated water collector 40 is installed long in a direction crossing the swash plate 22.

The treated water collectors 40 are installed in two to ten rows at regular intervals in the width direction of the swash plate 22. [

The treated water collector 40 is installed inside the overflow prevention frame 28 and is partly fixed to and supported by the fixture 50 which extends across the overflow protection frame 28 in the width direction.

A plurality of the fixed rods 50 are installed at predetermined intervals along the longitudinal direction of the treated water collectors 40. The number of the fixing table 50 is calculated and set so as to effectively support the weight of the treated water collector 40 and the treated water contained therein.

The fixing table 50 includes a latching bar 52 extending across the widthwise direction of the overflow preventing frame 28 and one end fixed to the latching bar 52 and the other end being connected to the process water collector 40 And a plurality of connecting rods 54 fixed to the upper end of the frame.

The treated water collector 40 is formed in a rectangular shape having a quadrilateral, a semicircle, or a trapezoidal cross section with an opened top surface and a rear side is opened to discharge treated water to the treated water outlet 16 .

When the upper surface edge of the treated water collector 40 is formed in a saw-tooth shape or a wavy shape, it is possible to effectively collect the treated water discharged to the upper surface of the swash plate 22.

It is preferable that the overflow preventing rim (28) is installed higher than the top edge of the treated water collector (40) because the raw water is not mixed with the treated water.

As shown in Figs. 10 and 11, on the rear side of the treated water collector 40, a treated water feeding member (not shown) for guiding the treated water discharged from the treated water collector 40 to the treated water outlet 16 60 are installed.

The treatment liquid feeding member 60 is formed by forming the bottom surface and the side surface in a closed state except for a portion connected to the treated water collector 40 so that raw water is not mixed with treated water.

Next, a description will be made of a process of depositing the slurry plate settler according to the present invention having the above-described structure. In the figure, a solid line arrow indicates flow direction of raw water or treated water, and a dashed line arrow indicates a flow direction of solid material (sludge).

The flocculation treatment water is first introduced through the flocculation feeding inlet 15 and the sedimentation treatment water is discharged through the treatment water discharge port 16 so that the entire flow is formed toward the treated water discharge port 16 side from the flocculation feeding inlet 15 side , And each swash plate (22) forms an upward flow.

The flocculation treatment water flowing through the coagulated milk inlet 15 flows into the interior of each inclined sedimentation module 20 through the open bottom of the inclined sedimentation module 20 and the inflow hole 25 formed in the side plate 24 And forms a flow upwardly along each of the swash plate 22.

As described above, the solid material (sludge, aggregate and / or particulate pollutant) included in the flocculation treatment water forming the upward flow along the swash plate 22 is precipitated on the entire surface of the swash plate 22 while descending due to its own weight , Descends along the swash plate 22, and is discharged to the bottom surface 12.

Then, the treated water settled and removed by the solid material (sludge) moves upwards, is uniformly distributed and rises over the diffusion protrusions 30, and collected in the treated water collector 40.

The treated water collected in the treated water collector 40 is collected in the treated water feeding member 60 and discharged through the treated water outlet 16 to the separation membrane tank for a post-process membrane filtration process.

14, KIMAS 20 (852 L x 1,740 H x 77 W) manufactured by Kolon Construction was used. The hollow fiber membrane had an outer diameter of 2.0 mm, an inner diameter of 0.8 mm, PVDF (polyvinylidene fluoride) hollow fiber (manufactured by Kolon Corporation) having a pore of about 0.1 탆 was used, and the total surface area of the hollow fiber membrane of the submerged membrane device was 60 m ² .

In the embodiment of the present invention, the volume of the inflow water flowing into the separation membrane bath was 1.2 m ³ , and the filtration rate in the embodiment of the present invention was designed to be 20 10 ^-3 m. The influent water flowing into the separation membrane bath was mixed After the pretreatment of the bath, flocculation tank, and sedimentation tank, they were introduced into the membrane separation tank.

In the separation membrane tank having the so-designed submerged separation membrane apparatus, the separator membrane operation was performed as shown in the detailed process diagram of the separation membrane filtration process of FIG.

That is, as the separation membrane submerging step (S100), water is replenished into a separation membrane tank provided with a submerged separation membrane apparatus (KIMAS 20) including a vertical hollow fiber membrane, and the submerged separation membrane apparatus is immersed in water. Thereafter, as the suction step (S200), the water in the separation membrane bath is filtered through the hollow fiber membrane of the submerged membrane separation device, and the filtration water is sucked for 39.75 minutes. As the pause process (S300), the suction process (S200) . The suction process (S200) and the pausing process (S300) were repeated seven times (R11).

Thereafter, as the separation membrane tank draining step (S400), water in the separation membrane tank is completely drained, and air pressure of 366 m / h is injected into the outer surface of the hollow fiber membrane of the submerged separation membrane apparatus to remove contaminants concentrated on the outer surface of the hollow fiber membrane Respectively.

Thereafter, the process of the separating membrane tank discharging process (S400) was repeated 15 times (R12) from the separating membrane dipping process (S100), and then the washing process (S500) was performed.

As shown in the process chart of FIG. 13, the cleaning process (S500) is a cleaning process (S510) of injecting the cleaning chemical through the interior of the hollow fiber membrane of the submerged separation membrane device for 2 minutes, And kept for 5 minutes. Also, as the cleaning agent replenishing step (S530), the cleaning agent was injected and replenished for 30 seconds, then the cleaning agent replenishment injection was stopped and maintained for 5 minutes as the second maintaining step (S540), and the cleaning agent replenishing step S530) and the second maintenance step S540 are repeated four times (Rc). Thereafter, in the discharge step (S550), the cleaning agent was discharged from the outside of the hollow fiber membrane and completely discharged through the separation membrane bath.

After the cleaning step (S500), the above-described whole process was repeatedly carried out while performing the separation membrane immersion step (S100).

As a result of using the water treatment system using the immersion type membrane apparatus as in the embodiment of the present invention, it was possible to manage the turbidity of the pretreated water precipitated through the inclined plate sedimentation tank to be less than or equal to, The filtration efficiency can be improved in filtering the treated water. In particular, the long-term use and service life of the hollow fiber membrane of the submerged membrane device can be improved.

Further, by operating the detailed operation process of the separation membrane filtration process as described above, the concentration of contaminants in the separation membrane vessel can be remarkably reduced, and the filtration efficiency and service life of the hollow fiber membrane of the submerged separation membrane apparatus can be greatly increased .

1 is a process diagram according to an example of a conventional water treatment system;

2 is a process diagram according to an example of a conventional water treatment system to which an advanced treatment method is applied.

3 is a process chart of a water treatment system using an immersion type membrane device according to an embodiment of the present invention.

4 is a perspective view showing one embodiment of a swash plate settler according to the present invention.

5 is a cross-sectional view in width direction showing an embodiment of a swash plate settler according to the present invention.

6 is a longitudinal sectional view showing one embodiment of a swash plate settler according to the present invention.

FIG. 7 is a perspective view of a sloped sedimentation module in an embodiment of a swash plate settler according to the present invention; FIG.

8 is a cross-sectional view in the width direction illustrating the inclined precipitation module in one embodiment of the swash plate settler according to the present invention.

9 is a longitudinal enlarged cross-sectional view of a sloped sedimentation module in accordance with an embodiment of the swash plate sedimentation bed of the present invention.

FIG. 10 is an enlarged perspective view of a swash plate settler according to an embodiment of the present invention, viewed from the rear side. FIG.

11 is a partially enlarged cross-sectional view showing a processed milk feeding member in an embodiment of the swash plate sedimentation bed according to the present invention.

12 is a driving process diagram of a separation membrane filtration process according to an embodiment of the present invention.

13 is a driving process diagram of a cleaning process according to an embodiment of the present invention.

14 is a photograph of a submerged membrane device used in an embodiment of the present invention.

Claims (7)

An admixture and flocculation process in which influent water is flocculated by mixing a flocculant; A precipitation step of subjecting the coagulation treatment water by the mixing and coagulation process to a precipitation treatment in a sedimentation tank; And a membrane filtration step of filtering the precipitated water by the precipitation step with a hollow fiber membrane of the submerged membrane separation apparatus in a separation membrane tank provided with a submerged separation membrane apparatus, In the sedimentation process, the sedimentation tank is provided with a sedimentation zone mold having a waterproof bottom surface and a wall surface, an agglomeration-treated milk inlet on one wall and a treated water outlet on the opposite wall, Or a plurality of water supply ports formed in parallel to a wall surface provided with a treated water discharge port at predetermined intervals and each of the water discharge ports is formed to be long along a direction perpendicular to a wall surface on which the coagulation- And a plurality of tilting and settling modules installed at intervals from the bottom of the settling zone frame, The coagulation treatment water by the mixing and coagulation process is precipitated through the swash plate settler, Wherein the separation membrane filtration step comprises: a separation membrane immersion step of replenishing the separation treatment water in the separation membrane tank to immerse the immersion type separation membrane apparatus in the precipitation treatment water; A sucking step of sucking the filtered water through the hollow fiber membrane of the submerged membrane separation device to filter the sedimentation water in the membrane separation membrane; A dormant step of dewatering the step of sucking the filtered water through the hollow fiber membrane of the submerged membrane separation apparatus by filtering the sedimentation water in the membrane separation tank; And a separation membrane tank discharging step of discharging the sedimentation treatment water in the separation membrane tank, Wherein the separation step is performed after the suction step and the dormant step are repeated one to 20 times in succession, and the separation membrane submerging step is performed again after the separation step of separating the separation membrane. Water treatment system. delete The system according to claim 1, wherein the hollow fiber membrane of the submerged membrane separation membrane device has a surface area ratio (ratio of filtration element volume to hollow fiber membrane unit surface area) of 2.0 × 10 ^-3 m or less. The method according to claim 1, Wherein the suction time in the suction process is 10 to 50 minutes, and the rest time in the rest process is 0.15 to 2 minutes. The method according to claim 1, further comprising an air pressure applying step of injecting air into the hollow fiber membrane of the submerged membrane separation apparatus at an air pressure of 150 to 400 m / Water Treatment System Using Membrane Device. The method according to claim 1, further comprising a cleaning step of cleaning the hollow fiber membrane of the submerged membrane separation device using a cleaning agent, The cleaning process may be performed 10 to 200 times from the separation membrane submerging step to the separating membrane discharge step And then repeating the above-described process. The cleaning method according to claim 6, A cleaning agent injecting step of injecting a cleaning agent into the hollow fiber membrane of the submerged membrane device; A first holding step of holding the cleaning agent for 2 to 10 minutes while the injection of the cleaning agent is completed; A cleaning agent replenishing step of injecting the cleaning agent for 30 to 120 seconds after the maintaining step; And a second maintenance step of maintaining the cleaning agent for 2 to 10 minutes after replenishing the cleaning agent, Wherein the cleaning agent replenishing step and the second holding step are repeated two to five times, and then the cleaning agent discharging step discharges the cleaning agent.

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