KR101614651B1 - Water treatment system and method using hydrocyclones - Google Patents

Abstract

The present invention relates to a water treatment system increasing treatment efficiency by using a hydrocyclone, and to a water treatment method using the same. The water treatment system comprises a pretreatment part pretreating raw water flowing into the water treatment system including a membrane filter part before membrane filtering in the membrane filter part.

Description

TECHNICAL FIELD The present invention relates to a water treatment system using a hydrocyclone,

Field of the Invention [0002] The present invention relates to a water treatment field, and more particularly, to a water treatment system that increases the treatment efficiency by using a hydrocyclone and a water treatment method using the same.

Recently, there has been a lot of controversy about clean and safe water supply and human hazard due to the occurrence of algae phenomenon caused by toxic algae from water sources such as rivers and lakes that are used as water supply sources.

In Korea, there are many artificial appeals for securing water resources, and the increase in the amount of sewage and wastewater due to the increase in industrial development and consumption level makes it impossible to predict the time of occurrence of the green algae. Such as geosmin and 2-MIB, are not enough to completely remove harmful substances such as hobby substances, ammonia nitrogen, chlorine-resistant pathogenic microorganisms and trace organic pollutants.

At present, water treatment facilities in Korea are taking deeper water as a countermeasure in case of algae, treating chlorine treatment, activated carbon treatment, etc. However, if the occurrence of green tide becomes prolonged and intensified as in the above-mentioned recent phenomenon, Therefore, it is necessary to improve the process in order to minimize the damage caused by the birds that will continuously occur in the future.

Algae control methods include coagulation, precipitation, chlorine injection, dissolved air flotation (DAF), multi-media filter, membrane, ozone treatment, activated carbon treatment, etc. These methods have problems such as disinfection by-product formation and algae-derived organic matter (AOM) leaching.

Figure 1 shows a conventional general purification process. When the raw water is taken from a water supply source, the raw water is temporarily stored in the storage tank 100, and treated water is filtered by the membrane filtration unit 500 through a water pipe 400 by a water intake pump P or the like.

The most frequent obstacles in this water treatment process are mainly the coagulation sedimentation efficiency in the process, the frequent occlusion of the filter paper and the increase of the usage of the chemicals, and the odor causing the distrust of the consumers' tap water.

In addition, the occurrence of algae causes microbial propagation in the aqueduct line 400, which results in higher maintenance costs for the source of higher loading relative to the quality of the intake water at the water purification plant.

On the other hand, toxins produced by toxic cyanobacteria are receiving the greatest attention in recent years among the problems caused by the green algae phenomenon. Since the first reports of animal damage by cyanobacterial toxins by Francis in 1878, there have been reports of damage to livestock and wildlife by cyanobacterial toxins from all over the world to date. In recent years, There is a lot of controversy about the effect on the human body due to the frequent occurrence of green algae due to toxic cyanobacteria.

Therefore, in order to solve this problem, it is necessary to prevent the inflow of algae, to solve the problems of the water treatment process due to the occurrence of high turbidity, to remove the particulate matter and algae so as to enable stable operation according to the original design, A technology capable of providing clean water is required.

The related prior art will be examined.

Japanese Laid-open Patent Publication No. 1997-170248 discloses a water purification system for detecting turbidity or the like as a sensor at a water supply source and judging whether or not to take water. The effect of preventing algae and the like from entering the water treatment process is similar, but there is a decisive problem in that the conventional technology does not allow the water intake to be taken at a high turbidity source.

Japanese Patent Application Laid-Open No. 2006-297240 discloses a system for detecting the presence of algae as a sensor at a water source and indexing the algae, determining the inactivation process of the algae, and performing the algae inactivation process accordingly. In addition, although the flow of the algae into the water treatment process can be prevented, the algae inactivation treatment according to the conventional art relies on chemical cleaning, which causes problems of maintenance due to frequent introduction of drugs and deterioration of the quality of the treated water have.

Japanese Unexamined Patent Application Publication No. 2002-141567 discloses a method of introducing a coagulation process in purifying raw water including flotation algae, followed by destroying air bubbles inside the algae using a high voltage pulse and then sinking the algae. In the case of this prior art, there is a problem of safety due to the use of a high voltage pulse, a problem of separately treating floating algae, and a problem of deterioration of the quality of the final treated water.

(Patent Document 1) Japanese Laid-Open Publication No. 1997-170248

(Patent Document 2) Japanese Laid-Open Publication No. 2006-297240

(Patent Document 3) Japanese Laid-Open Patent No. 2002-141567

Accordingly, it is an object of the present invention to provide a water treatment system and method capable of solving the above problems.

In particular, it is intended to provide a system and method that can prevent the inflow of algae that are problematic in a water treatment process, at the time of withdrawal.

For this purpose, a hydrocyclone, which is one of the known technologies, is used. When the raw water taken is directly used as a hydrocyclone, the efficiency of solid-liquid separation is not high.

In addition, when the exhaust gas is excessively discharged to enhance the water purification efficiency, the throughput may be lowered, and a solution that can solve the throughput problem at the same time is proposed.

Finally, it is intended to provide a water treatment system and method which can prevent the inflow of algae from the source, can operate stably according to the original design, has low operation cost for maintenance, and can supply safe and clean water.

According to an aspect of the present invention, there is provided a storage tank, including: a storage tank (100) in which raw water is introduced and stored from a collection source; A three-channel valve (V1) located on a flow path through which raw water is discharged from the storage tank (100) and whose operation is controlled by the algae and turbidity of the raw water; A flocculant storage tank 215 storing a flocculant to be supplied to the raw water discharged from the storage tank 100; And a hydrocyclone (230) separated from the raw water from the storage tank (100) and the flocculant from the flocculant reservoir (215) into treated water and effluent by the solid-liquid separation treatment, The effluent separated from the clone 230 is selectively reintroduced into the raw water flowing out of the storage tank 100. [

When the waste water separated from the hydrocyclone 230 flows into another hydrocyclone 240, it is separated into treated water and effluent water by solid-liquid separation treatment, and the treated water separated from the hydrocyclone 240 It is preferable that the hydrocyclone 230 is discharged to the treated water storage together with the treated water separated from the hydrocyclone 230.

It is preferable that the treated water flowing out to the treated water storage portion passes through the water pipe line 400 and the membrane filtration unit 500.

In addition, when the algae and turbidity of the raw water flowing into the storage tank 100 is within a predetermined first range, the raw water is supplied to the hydrocyclone 230 in the first mode of the three-channel valve V1 It is preferable that the raw water is introduced into the water pipe 400 by the second mode of the three-channel valve V1.

Further, it is preferable that the apparatus further comprises another three-channel valve (V2) disposed in a flow path connecting the hydrocyclone (240) and the storage tank (100).

When the algae and turbidity of the effluent separated from the hydrocyclone 240 are within a predetermined second range, the discharged water is discharged to the outside of the system by the first mode of the three-channel valve V2, The discharge water may be reintroduced into the raw water flowing out of the storage tank 100 by the second mode of the three-channel valve V2.

According to another aspect of the present invention, there is provided a method of measuring a turbidity of raw water flowing into a storage tank (100) from a water source, (b) introducing the raw water introduced by the three-channel valve (V1) into the hydrocyclone (230) together with the flocculant when the measured algae and turbidity are within a predetermined first range; (c) subjecting the hydrocyclone (230) to solid-liquid separation so that the raw water introduced together with the flocculant is separated into effluent and treated water; And (d) the separated waste water is selectively reintroduced into raw water flowing out of the storage tank (100).

The method may further include the step of (e) after the step (d), the treated water is filtered through the water pipe line 400 and the membrane filtration unit 500 and stored in the treated water storage unit.

The step (b) further comprises the step of (b1) when the measured flow rate and turbidity are outside a first predetermined range, the step of introducing the raw water into the water pipe 400 by the three-channel valve (V1) .

In addition, after the step (c), (c1) the separated water from the hydrocyclone 230 flows into another hydrocyclone 240; And (c2) further separating the hydrocyclone (240) from the effluent and treated water by performing a solid-liquid separation process, wherein the step (d) includes the steps of: To the raw water flowing out from the storage tank (100).

In addition, the step (c2) may further include: (c3) measuring the algae and turbidity of the effluent water classified in the step (c2); And (c4) discharging the discharge water separated in the step (c2) by the other three-channel valve (V2) to the outside when the measured algae and turbidity are within a predetermined second range, (d2) is performed by the other three-channel valve (V2) when the measured flow rate and turbidity are outside the predetermined second range, and the discharge water divided in the step (c2) is discharged to the raw water discharged from the storage tank It is preferable that the step is reintroduced.

According to the present invention, it is possible to prevent the inflow of algae, which is a problem in the water treatment process, in advance, thereby improving the water purification efficiency, reducing the operating cost for maintenance, and supplying safe and clean water.

In addition, since the hydrocyclone has a high solid-liquid separation efficiency, it is possible to produce cleaner treated water.

In addition, since the throughput is high, even when the same amount of raw water is taken, the ratio of final treated water is high.

In addition, propagation of microorganisms in the water pipe can be prevented from occurring, and the lifetime of the membrane filtration part can be increased.

1 is a conceptual diagram showing a conventional water treatment system.
2 is a conceptual diagram showing a water treatment system according to the present invention.
3 is a cross-sectional view schematically showing a hydrocyclone used in a water treatment system according to the present invention.
4 is a flowchart illustrating a method of processing an integer in the water treatment system according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

Description of water treatment system

The water treatment system according to the present invention will be described with reference to FIG.

In the storage tank 100, raw water from a water supply source flows in and is stored.

The algae and turbidity meter (S1) can be located in the flow path to the storage tank (100) to measure the algae and turbidity of the raw water.

The raw water is moved by the water intake pump P, and the three-channel valve V1 can operate in the first mode and the second mode according to the algae and turbidity measured by the algae and turbidity meter S1.

When the algae and turbidity measured by the algae and turbidity meter S1 are within the predetermined first range, the three-channel valve V1 operates in the first mode and the raw water flows toward the hydrocyclone 230 2). That is, the predetermined first range means that the raw water taken is in a level required for solid-liquid separation by the hydrocyclone 230 as described later.

On the other hand, when the algae and turbidity measured by the algae and turbidity meter S1 are outside the predetermined first range, the three-channel valve V1 operates in the second mode, and the raw water flows toward the water pipe 400. That is, the raw water taken is at a level at which the solid-liquid separation by the hydrocyclone 230 is not necessary.

Here, the predetermined first range can be easily adjusted by the user. For example, an appropriate reference value is set within the range of 15 to 25 mg / m 3 of chlorophyll a, 500 to 5,000 cells / ml of cyanobacteria, and 10 to 50 NTU of turbidity, and set to be within the first range .

When the three-channel valve (V1) is in the first mode, the raw water flows toward the hydrocyclone (230). At this time, the coagulant flows into the raw water from the coagulant storage tank 215 and is stirred by the line mixer 220. When the raw water is directly introduced into the hydrocyclone 230, the flocculant is additionally introduced because the effect of solid-liquid separation is low.

Referring to FIG. 3, one embodiment of a hydrocyclone 230 is shown.

When the coagulant and the raw water stirred in the line mixer 220 flow into the housing 232 through the inlet channel 231 and are subjected to rotational force by the rotation of the accelerator 233, the impurities whose mass is increased by the flocculant, And is discharged as drain water through the downflow channel 235. The treated water excluding the drain water is raised and discharged through the upflow channel 234.

The hydrocyclone 230 itself is the prior art, and its operation and the detailed description of its construction are omitted.

Again, see FIG.

As described above, the raw water flowing into the hydrocyclone 230 is divided into treated water and drain water, and the treated water flows to the water pipe 400. The drain water passes through another three-channel valve V2, which will be described later, Can be re-introduced into the raw water flowing out from the engine 100 or discharged to the outside.

In one embodiment of the present invention, the effluent may be subjected to solid-liquid separation while passing through another hydrocyclone 240 again.

In this case, the treated water separated from the hydrocyclone 240 flows to the water pipe 400 together with the treated water separated from the hydrocyclone 230 and passes through the three-channel valve V2 And may be re-introduced into the raw water flowing out of the storage tank 100 or may be discharged to the outside.

Particularly, the flow path through which the effluent water separated from the hydrocyclone 240 flows is further provided with another algae and turbidity meter S2. When the measured algae and turbidity are within the predetermined second range, The valve V2 operates in the first mode and is discharged outside the system. That is, the predetermined second range means a range of high degree of contamination to such an extent that even if re-entering the raw water flowing out of the storage tank 100, it can not be processed.

When the algae and turbidity measured by the algae and turbidity meter S2 are outside the predetermined second range, the three-channel valve V2 operates in the second mode to re-enter the raw water flowing out of the storage tank 100 . That is, it means that, when re-flowing into the raw water flowing out of the storage tank 100 and re-processing, it can be processed to some extent.

By the arrangement of the circulation line, when the water treatment system according to the present invention is applied, the treatment efficiency is high, and a considerable amount of throughput can be secured and the amount of discharged water can be reduced.

Explanation of the method of water treatment

Hereinafter, a water purification method according to the present invention will be described with reference to FIG.

First, raw water flows into the storage tank 100 from a water source. The algae and turbidity of the raw water introduced by the algae and turbidity meter S1 are measured (S100).

When the measured algae and turbidity are within a predetermined first range (S200), that is, when the liquid-liquid separation treatment by the hydrocyclone 230 is necessary, the three-channel valve V1 operates in the first mode And the raw water flows toward the hydrocyclone 230 (S300).

When the measured algae and turbidity are outside the predetermined first range (S200), that is, when the solid-liquid separation treatment by the hydrocyclone 230 is not necessary, the three-channel valve V1 operates in the second mode The raw water flows to the water pipe 400 as it is.

When the raw water flows into the hydrocyclone 230 in the first mode, the coagulant flows into the raw water from the coagulant storage tank 215 and is stirred with the raw water by the line mixer 220 (S400) 230 to perform a solid-liquid separation process (S500).

In one embodiment of the present invention, the effluent separated in the hydrocyclone 230 may be selectively re-introduced, but in another embodiment of the present invention, the effluent separated in the hydrocyclone 230 may be combined with other hydrocyclones 240 ), And as a result, the two-stage process is performed (S600).

In this process, the separated treatment water also flows to the drain pipe 400 (S700). And may be stored in the final process water storage section via the membrane filtration section 500.

The effluent is again measured for algae and turbidity by the algae and turbidity meter S2 (S800). When the measured algae and turbidity are within the predetermined second range, they are discharged to the outside by another three-channel valve V2 (S920).

If the measured flow and turbidity are out of the predetermined second range, the flow is re-introduced into the raw water flowing out of the storage tank 100 by the three-channel valve V2 (S910), and the step S100 and the following steps are repeated .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the present invention can be changed.

S1, S2: Algae and turbidity meter
P: Suction pump
V1, V2: Three-channel valve
100: Storage tank
215: coagulant storage tank
220: Line Mixer
230, 240: hydrocyclone
400: With a water pipe
500: membrane filtration section

Claims (11)

And a pretreatment unit for pretreating the raw water introduced into the water treatment system including the membrane filtration unit (500) before the membrane filtration treatment in the membrane filtration unit (500)
The pre-
A storage tank (100) in which raw water is introduced and stored from a water supply source;
An algae and turbidity meter S1 for measuring algae and turbidity of raw water flowing into the storage tank 100;
A three-channel valve (V1) located on a flow path through which raw water is discharged from the storage tank (100) and whose operation is controlled by the algae and turbidity of the raw water measured by the algae and turbidity meter (S1);
A flocculant storage tank 215 storing a flocculant to be supplied to the raw water discharged from the storage tank 100;
A hydrocyclone 230 in which raw water from the storage tank 100 and a flocculant from the flocculant reservoir 215 are stirred and introduced;
Another hydrocyclone 240 connected to the hydrocyclone 230; And
And another three-channel valve (V2) disposed in a flow path connecting the other hydrocyclone (240) to the storage tank (100)
When the algae and turbidity of the raw water flowing into the storage tank 100 are within the predetermined first range, the raw water flows into the hydrocyclone 230 by the first mode of the three-channel valve V1, The process water is divided into treated water and drain water by a separation process, and the separated process water flows into the membrane filtration unit 500 through the water pipe 400,
When the flow and turbidity of the raw water flowing into the storage tank 100 is outside the predetermined first range, the raw water is supplied to the membrane filtration through the water pipe 400 by the second mode of the three- (500)
When the algae and turbidity of the effluent separated from the other hydrocyclone 240 are within the second predetermined range, the effluent is discharged to the drain pipe 400 by the first mode of the three-channel valve V2, And to the outside of the system without flowing into the membrane filtration unit 500,
When the algae and turbidity of the effluent separated from the other hydrocyclone 240 are outside the predetermined second range, the effluent is discharged from the reservoir 100 by the second mode of the three-channel valve V2 The concentration of algae and turbidity contained in the raw water flowing out of the storage tank 100 is reduced and the raw water having a reduced concentration of the algae and turbidity flows into the hydrocyclone 230, Liquid separation,
Water treatment system.
The method according to claim 1,
When the waste water separated from the hydrocyclone 230 flows into the other hydrocyclone 240, it is divided into treated water and effluent water by solid-liquid separation treatment,
The treated water separated at the other hydrocyclone 240 flows out to the treated water storage together with the treated water separated at the hydrocyclone 230,
Water treatment system.
3. The method of claim 2,
The treated water flowing out to the treated water storage portion passes through the water pipe line 400 and the membrane filtration unit 500,
Water treatment system.
delete delete delete A water treatment method using the water treatment system according to claim 1,
(a) measuring the algae and turbidity of the raw water flowing into the storage tank (100) from the water intake source;
(b) introducing raw water introduced by the three-channel valve (V1) into the hydrocyclone (230) together with the flocculant when the measured algae and turbidity are within a predetermined first range;
(c) separating the raw water introduced with the flocculant into effluent and treated water through solid-liquid separation in the hydrocyclone (230); And
(d) selectively re-entering the separated waste water into raw water flowing out of the storage tank (100)
Water treatment method.
8. The method of claim 7,
After the step (d)
(e) the treated water is filtered through the wastewater path (400) and the membrane filtration unit (500) and stored in the treated water storage unit.
Water treatment method.
9. The method of claim 8,
The step (b)
(b1) the raw water is introduced into the water pipe (400) by the three-channel valve (V1) when the measured algae and turbidity are outside a predetermined first range.
Water treatment method.
9. The method of claim 8,
After the step (c)
(c1) introducing the separated water discharged from the hydrocyclone (230) into the other hydrocyclone (240); And
(c2) further solid-liquid separation treatment is performed on the other hydrocyclone (240) to separate into effluent and treated water,
In the step (d), the waste water separated in the step (c2) is selectively reintroduced into the raw water flowing out of the storage tank (100)
Water treatment method.
11. The method of claim 10,
After the step (c2)
(c3) measuring the algae and turbidity of the effluent separated in the step (c2); And
(c4) discharging the discharge water separated in the step (c2) by another three-channel valve (V2) when the measured flow rate and turbidity are within a predetermined second range,
In the step (d), if the measured algae and turbidity are outside the predetermined second range, the waste water separated in the step (c2) by the other three-channel valve (V2) flows out from the storage tank In the step of re-entering the raw water,
Water treatment method.

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