KR101655965B1 - Equipment of seawater desalting - Google Patents

Abstract

The present invention relates to a small sea water desalination facility for treating island area fresh water and sea water. According to the present invention, the small sea water desalination facility comprises: a pretreated water storage tank (40) storing filtered fresh water and sea water; a high-pressure pumping device (60) in which a plurality of high-pressure pumps are installed in series and in parallel while the fresh water and sea water is pressed and pumped by a reverse osmosis filtration device; the reverse osmosis filtration device (70) for filtering and treating the supplied fresh water and sea water; a treated water storage tank (80) for storing the treated water discharged from the reverse osmosis filtration device; a water exchange pipe (90) for selectively supplying a portion of concentrated water discharged from the reverse osmosis filtration device to the pretreated water storage tank (40); a normal drain pipe (100) for normally draining the portion of concentrated water discharged from the reverse osmosis filtration device; a select drain pipe (110) for selectively draining the concentrated water; a drain branch pipe (140) branched for recycling a portion of the drained concentrated water; and a mineral concentrated storage tank (150) for chemically treating a portion of concentrated water branched to the drain branch pipe (140). According to the present invention, power consumption is reduced, and overloading of a high-pressure pump and consequent shortening of the service life are prevented. Therefore, water intake source utilization rates insufficient in an island area can be maximized, and a good quality of drinking water can be supplied for residents in an island area.

Description

{Equipment of seawater desalting}

The present invention relates to a small-sized desalination plant for desalination water for the island area.

The seawater desalination technology is a representative technology field that can solve the domestic water demand, provide alternative water resource securing technology, and pioneer the overseas market and create high value.

According to several reports, the seawater desalination market is currently at 3 million tonnes / day and is expected to grow to 6.2 million tonnes / day by 2015.

In addition, seawater desalination technology has become a solution to providing alternative water resources for domestic water-scarce areas. In particular, it can reduce costs and improve environmental problems by replacing measures for securing water resources through dam construction, which is controversial for environmental issues. Therefore, domestic demand is expected to continue to increase in the future.

The seawater desalination method can be largely classified into an evaporation method and a reverse osmosis method. Reverse osmosis is widely used in recent years because the reverse osmosis method requires a relatively small amount of energy to produce a unit volume of water as compared with the evaporation method. The reverse osmosis method separates the components contained in seawater or sea water into treated water and concentrated water by using a polymer membrane (reverse osmosis membrane). The treated water is used as water and drinking water by diluting the component concentration, and the concentrated water is discharged to the sea do.

The seawater desalination facilities are customized to various types according to the conditions of the area to be installed and the type of raw water.

Among these, there are not many resident people in the coastal area, and the geographical requirement that can be installed normally is bad.

In addition, the features of the coastal area of the book include the phenomenon that the seawater layer with higher density than the fresh water pushes the lower part of the aquifer, with the freshwater layer on the upper part and the seawater layer on the lower part.

That is, it can be understood that the boundary between the two layers is formed at a portion where the pressure applied by the density of the lower seawater layer and the pressure applied by the weight of the upper freshwater layer are balanced, and the water layer is formed near the boundary.

Therefore, the development of excess reservoir to obtain groundwater and the excessive intake of water may cause the boundary layer to become unbalanced, and the boundary layer may gradually move toward the land, resulting in a rise in the TDS of the intake water.

In this way, it is common in the island area that seasonal and regional changes occur continuously and it is difficult to forecast future seawater intrusion.

Therefore, the shortening facilities using the reverse osmosis membrane system installed in the island area have used a large pump having a pressure higher than the actual required pressure in order to cope with various salinity change phenomena.

However, in this case, even if the salinity is low, the pump operates at a high pressure, so unnecessary rotation of the motor is generated and wastes energy, and a large-sized high-pressure pump is installed.

A method of varying the pump pressure by varying the number of revolutions of the motor, such as a BLDC motor, may be proposed, but the cost of such a pump is high and the AS cost is also increased.

As a technique for solving such a problem, a "high-pressure pump system of an energy-saving reverse osmosis membrane filtration membrane seawater desalination apparatus" (Korean Patent Registration No. 10-1189006, Patent Document 1) has been proposed.

In Patent Document 1, the piping for pressurizing and moving the pretreated water to the reverse osmosis membrane is constituted by a plurality of branched pipes each having a high-pressure pump, and selectively operates the high-pressure pump according to the degree of water salinity to prevent unnecessary operation of the high- And a valve is provided to prevent the water from moving with the non-moving high-pressure pump.

Patent Document 1 discloses that the salinity of the pretreatment unit is sensed through a control box.

The above Patent Document 1 is considered to be very efficient in that the residents can extend the life of the desalination facilities in the island area where the elderly are mostly elderly.

However, in the desalination plant with reverse osmosis filtration system, the usable water (treated water) passing through the reverse osmosis filtration apparatus is only 35% of the initial influent amount and the remaining 65% is drained, I can not help it.

In addition, with the increase in groundwater use in the island area, rainfall is not constant and it is not raining like drought. Suddenly, heavy rainfall is taking place.

However, it is not practical to install high capacity, large-scale desalination facilities in the islands with a small population. For example, it is a difficult reality to install facilities that increase the cost of facilities, such as a combination of positive osmosis and reverse osmosis.

On the other hand, a method of reusing reverse osmosis membrane concentrated water and a reuse system of reverse osmosis membrane concentrated water using the same (Korean Patent Registration No. 10-1360019, Patent Document 2) discloses a method in which a coagulant is supplied to a reverse osmosis membrane- A filtration, and an oxidation treatment are continuously performed so that the concentrated water can be reused.

However, in Patent Document 2, since a number of processes such as filtration, electrolysis, biofilm filtration, and oxidation must be provided, facilities are complicated, resulting in an excessive cost, an increase in the processing facility area and maintenance, It is practically impossible to utilize it.

Although the high-pressure pump is operated economically by selectively driving the high-pressure pump and the maintenance of the high-pressure pump is facilitated, the problem of insufficient total water intake is difficult to solve, Since the treatment process for the reuse of concentrated water such as Document 2 is very complicated and requires a large number of devices, there is a problem in practical application in the book area.

On the other hand, if the salt concentration of the sea water taken from the underground water in the island area is below 5,000 ppm TDS, the water produced through the reverse osmosis filtration system will produce water near to pure water.

Drinking water, which is usually consumed, is desirable to contain a variety of minerals that are beneficial to the human body. Thus, when the low-concentration drinking water is fed through the desalination facilities of the island, it becomes difficult to consume minerals.

In addition, reverse osmosis filtration treatment of low-concentration drinking water results in a phenomenon that the pH value of the produced water is lower than that of the normal drinking water.

Normally, pH is adjusted by supplying caustic soda to raw water to raise the pH. In case of drinking water, when caustic soda is added, there is a danger that residents may drink caustic soda and other ingredients.

KR 10-1189006 (September 28, 2012) KR 10-1360019 (2014.02.03)

In order to solve the problems of the conventional art, the seawater desalination facility for small-area seawater desalination for the island area of the present invention is equipped with a desalination desalination plant having a reverse osmotic pressure type in which a high-pressure pump is automatically selected in response to a time- To reduce seawater desalination facility cost and power consumption.

In addition, due to the nature of the reverse osmosis desalination plant, 65% of the raw water is drained and only about 35% of the raw water is produced as used water (treated water). As a result, the total amount of water withdrawn is limited. As much as possible.

In particular, the generated concentrated water is sent to the pretreatment water storage tank without additional treatment facilities, so that it is subjected to the same filtration treatment as the pretreatment water, which makes it difficult to maintain and manage, I want to.

In addition, when the total amount of the concentrated water is not supplied to the pretreating water storage tank, half of the concentrated water is always drained, and the TDS value for the remaining total amount is obtained. When the value is low according to the TDS value, And to minimize the damage of the reverse osmosis membrane and to utilize it continuously.

In addition, when some of the concentrated water drained is filtered with a microfilter and stored, when the TDS of the produced water discharged from the reverse osmosis filtration device is less than 50 ppm and the pH is lowered to about 5.0, filtered concentrated water is supplied to obtain TDS 300 ppm, to a pH close to pH 6.5 so as to provide a beneficial essence to the human body.

In order to solve the above-mentioned problems, a small-scale desalination plant for treating island-area waters in accordance with the present invention comprises: a pretreatment water storage tank (40) for storing pretreated water filtered by water taken from an underground water well; A supply pipe 61 connected to the pretreating water storage tank 40 and provided with a first temperature measuring device 61a for measuring the total dissolved solids value in the pretreated water, A first branch pipe 62 provided with a first hydraulic valve 62a and a first high-pressure pump 62b and a second high-pressure pump 62c serially connected to the discharge side, (62a) and the second high-pressure pump (62c) are connected to the first high-pressure pump (61) and the second high-pressure pump (62c) A second branch pipe 63 connected to the first branch pipe 62 and the second branch pipe 63 and connected to the first hydraulic valve 62a and the second branch pipe 63, (64) for discharging the pressurized water from the first branch pipe (62) or the second branch pipe (63) in accordance with the opening and closing of the second electric valve (63a) A high pressure pumping device 60; A reverse osmosis filtration device 70 connected to the high-pressure pumping device 60 through a discharge pipe 64 and supplied with pressurized pretreatment water to filter the reverse osmosis process water to discharge treated water and concentrated water; A second TDS measuring device 91 for measuring the total dissolved solids value in the concentrated water supplied to the inlet side of the conduit is provided on one side of the conduit and connected to the reverse osmosis filtration device 70 to receive the concentrated water, And the other end is connected to the pretreating water storage tank 40 and supplies the supplied concentrated water to the pretreating water storage tank 40; A partial opening valve 101 having a predetermined opening and closing rate and a partially opened state is provided on the conduit, and a part of the concentrated water flowing into the water returning pipe 90 A drain pipe (100) for normal drain; A selective drain pipe 110 having one side connected to the inlet side of the water return pipe 90, a fourth electric valve 111 connected to the conduit, and configured to drain the concentrated water; A fifth electrically operated valve 141 is provided on the conduit so that the fifth electrically operated valve 141 is selectively energized through the drain pipe 100, A drain branch 140 through which a microfilter 142 is installed on the conduit and the concentrated water is filtered; One side of which is connected to the drain branch 140 and the concentrated water filtered through the microfilter 142 is supplied to the inside and the other side is connected to a medicine charging device 151 for supplying sodium hypochlorite, And a drain drain pipe 153 for selectively draining the concentrated water stored therein is connected to the sixth electromotive valve 154 on the conduit while a level meter 155 for measuring the internal water level A mineral concentrated water storage tank 150 installed inside; And the upper one side is connected to the reverse osmosis filtration device 70 by piping to receive and store the treated water and the mineral concentrated water supply pipe 81 provided with a concentrated water amount supply pump 81a on the pipe, A filtration concentrated water stored in the mineral concentrated water storage tank 150 is selectively supplied in a fixed amount and connected to the first solid acid water storage tank 150. A third solid water solidifier 82 for measuring the total dissolved solid value of the liquid stored therein is installed on one side A purified water storage tank 80 provided on the other side of the pH meter 83 for measuring the pH of the liquid stored therein; The first and second torsion meters 61a and 91b and the first and second electric motors 61 and 62a and 63a and 63 and the third and fourth electric motors 61 and 62 are connected to the first and second torsion sensors 61a and 61b, The first high pressure pump 62b, the second high pressure pump 62c, the third high pressure pump 63b, the medicine quantity supply pump 152, the fifth electromotive valve 141, the sixth electromotive valve 154, And is connected electrically to the correction amount supply pump 81a, the third temperature measuring device 82, the pH measuring device 83 and the level measuring device 155. The total dissolved solids value measured by the first temperature measuring device 61a 62b, 62c, and 63b, selectively opening and closing the first and second electromotive valves 62a and 63a in accordance with the control signals from the first and second pressure gauges 91 and 92, The third electromotive valve 92 and the fourth electromotive valve 111 are selectively operated according to the total dissolved solids value and the timer is built in to open the sixth electromotive valve 154 at a predetermined time interval, Lt; RTI ID = 0.0 > 155 < Selectively activates and closes the fifth electromotive valve 141 in accordance with a signal from the level meter 155 and activates the medicine quantity supply pump 152 according to a signal change detected by the level meter 155, and a control device 120 configured to selectively operate the concentrated water supply pump 81a according to the total dissolved solids value and the pH value measured by the pH meter 83. [

The total dissolved solids value and the pH value in the filtration concentrated water passing through the microfilter 142 at the point between the microfilter 142 and the mineral concentrated water storage tank 150 And the fourth TDISt measuring device 143 and the first pH measuring device 144 are electrically connected to the control device 120 , The control device 120 compares the total dissolved solids value and the pH value measured by the fourth TDS measuring device 143 and the first pH measuring device 144 with the total dissolved solids value and the pH value measured by the third TDS measuring device 82 and the pH measuring device 83 And the operation of the concentrated water supply pump 81a is controlled by comparing the measured total dissolved solids value and the pH value.

One end of the drain pipe 153 is connected to the storage drain pipe 153 and the other end of the drain pipe 153 is connected to the pretreatment water storage tank 40. A connection point to the storage drain pipe 153 is electrically connected to the control device 120 And a direction control valve 161 is provided to switch the outlet direction under the control of the control device 120 to selectively drain or concentrate filtration concentrated water stored in the storage tank drain pipe 153 to the pretreatment water storage tank 40 An auxiliary drain branch pipe 160 is installed and the control device 120 controls the opening and closing direction of the directional control valve 161 in accordance with the total dissolved solids measured by the fourth pressure gage measuring device 143 .

According to the present invention, it is possible to reduce the seawater desalination facility cost and the consumption power consumption by providing the reverse osmosis type seawater desalination facility in which the high-pressure pump is automatically selected in response to the TDS value varying instantaneously.

In addition, due to the nature of the reverse osmosis desalination plant, 65% of the raw water is drained and only about 35% of the raw water is produced as used water (treated water). As a result, the total amount of water withdrawn is limited. As much as possible.

In particular, the generated concentrated water is sent to the pretreatment water storage tank without additional treatment facilities, so that it is subjected to the same filtration treatment as the pretreatment water, which makes it difficult to maintain and manage, do.

In addition, when the total amount of the concentrated water is not supplied to the pretreating water storage tank, half of the concentrated water is always drained, and the TDS value for the remaining total amount is obtained. When the value is low according to the TDS value, And minimizes the damage of the reverse osmosis membrane.

In addition, when some of the concentrated water drained is filtered with a microfilter and stored, when the TDS of the produced water discharged from the reverse osmosis filtration device is less than 50 ppm and the pH is lowered to about 5.0, filtered concentrated water is supplied to obtain TDS 300 ppm, lt; RTI ID = 0.0 > pH 6.5. < / RTI >

In summary, the present invention maximizes the utilization rate of scarce water intake in the island area while preventing the overload of the high-pressure pump and the shortening of the life due to the power consumption while reducing power consumption, will be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a small-scale desalination plant for treating seawater in the book area of the present invention.
2 is a block diagram showing a configuration example of a control device in the present invention.
3 is a flowchart showing an example of a control method of a control device according to measurement values of a first TSI, a second TSI, and a third TSI in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

A small-scale seawater desalination plant for the treatment of island water of the present invention comprises a raw water storage tank 10, a multi-layer filtration apparatus 20, a first microfiltration apparatus 30, a pretreatment water storage tank 40, a second microfiltration apparatus 50 The reverse osmosis filtration device 70, the process water storage tank 80, the water return pipe 90, the normal drain pipe 100, the selective drain pipe 110, the drain branch pipe 140, the high pressure pumping device 60, A mineral-concentrated water storage tank 150, and a control device 120. As shown in FIG.

As shown in FIG. 1, the raw water storage tank 10, which is a constituent element of the present invention, stores the water collected from the underground reservoir of the book area to be treated.

1, the multi-layer filtration apparatus 20, which is a component of the present invention, is connected to the raw water storage tank 10 through a pipe provided with a raw water supply pump 21 to store the water stored in the raw water storage tank 10 To be supplied.

At this time, the raw water supply pump 21 can be installed solely in the piping, but as shown in the figure, one branch pipe is provided and one valve is installed before and after the pump, Function can be performed.

The multi-layer filtration apparatus 20 is configured to filter suspended matters and organic substances in the supplied raw water, and to remove turbidity and chromaticity.

For this purpose, the multi-layer filtration apparatus 20 has a multi-layered filter member such as sand, and the water is passed through the multi-layer filtration member to remove foreign matters such as colloid substances, organic substances, inorganic substances, do.

The first microfiltration apparatus 30, which is a constituent element of the present invention, is provided with a plurality of filters therein. The microfiltration apparatus 30 receives the filtered wastewater from the multi-layer filtration apparatus 20, Filtered.

As shown in FIG. 1, the pretreating water storage tank 40, which is a constituent element of the present invention, is connected to the primary microfiltration apparatus 30 to store the pretreated water subjected to primary microfiltration.

As shown in FIG. 1, the secondary microfiltration apparatus 50, which is a component of the present invention, is connected to the pretreating water storage tank 40 through a pipe provided with a pretreating water supply pump 51, ) In the pretreatment water is filtered secondarily.

The second microfiltration unit 50 is provided with a plurality of filters therein, such as the first microfiltration unit 30, so that the microfluidic substances and solids contained in the pretreated water are filtered.

The high pressure pumping device 60 constituting the present invention is constituted by a supply pipe 61, a first branch pipe 62, a second branch pipe 63 and a discharge pipe 64 as shown in FIG. 1 .

The supply pipe 61 is supplied with the pretreated water discharged from the second microfiltration unit 50 to supply the pretreated water to either the first branch pipe 62 or the second branch pipe 63.

At this time, the supply pipe (61) is provided with a first temperature gauge (61a) for measuring the total dissolved solids value in the introduced pretreatment water.

The first branch pipe 62 is branched and connected to the supply pipe 61 and is provided with a first electric valve 62a at the inlet side and is connected to the first high pressure pump 62b and the second high pressure pump 62b 62c are continuously connected in series.

At this time, the first high-pressure pump 62b is composed of a three-stage multi-stage pump having a suction contrast discharge pressure of 22 bar and the second high-pressure pump 62c is preferably composed of a multi-stage pump having a suction contrast discharge pressure of 20 bar .

The second branch pipe 63 is also branched and connected to the supply pipe 61. The second hydraulic valve 63a is provided on the inflow side and the first high-pressure pump 62b and the second high- And a third high-pressure pump (63b) having a processing pressure larger than the sum of the processing pressures of the first high-pressure pump (62c) and the second high-pressure pump (62b).

At this time, it is preferable that the third high-pressure pump 63b is constituted of a plunger pump having a suction contrast discharge pressure of 60 bar.

The discharge pipe 64 is connected to the first branch pipe 62 and the second branch pipe 63 which are branched and selectively connected to the first branch pipe 62 and the second branch pipe 63 from the first branch pipe 62 and the second branch pipe 63, So that the pressurized pretreatment water is discharged.

The reverse osmosis filtration device 70, which is a constituent element of the present invention, is connected to the high-pressure pumping device 60 through a discharge pipe 64 and is supplied with pressurized pretreatment water and filtered through reverse osmosis to reduce or remove the salt And to discharge concentrated water with increased water and salt content.

At this time, the discharged concentrated water has a salinity of about 1.5 to 2 times higher than that of the raw water supplied, and the pH is about 7.5 to 8.5 as compared with the drinking water.

As known in the art, a reverse osmosis membrane may contain a plurality of vessels and a plurality of reverse osmosis membranes may be filled in each vessel.

As shown in FIG. 1, the process water storage tank 80 is piped to the reverse osmosis filtration device 70 to receive and store the treated water, and the purified water is discharged to the discharge side.

As shown in FIG. 1, one end of the water return pipe 90, which is a component of the present invention, is connected to the reverse osmosis filtration device 70 by piping to receive concentrated water from the reverse osmosis filtration device 70, And is connected to the pretreatment water storage tank 40 to supply the supplied concentrated water to the pretreatment water storage tank 40.

At this time, a second TDS measuring device 91 for measuring the total dissolved solids value in the supplied concentrated water is provided on the inlet side of the water pipe 90, and a third electric valve 92 as shown in the figure is installed on the pipe .

One part of the normal drain pipe 100, which is a component of the present invention, is connected to the inflow side of the water return pipe 90, and a partial opening valve 101 having a certain opening / And drains a part of the concentrated water flowing into the water return pipe (90).

At this time, some of the opening valves 101 may be made to have a closing amount of about half by manual valves.

Alternatively, a part of the opening valve 101 may be constituted by a motorized valve and electrically connected to the control device 120, and the opening / closing rate may be adjusted according to the measured value of the second temperature measuring device 91.

In this case, by regulating the quantity of the concentrated water to be always drained, it becomes possible to more finely regulate the recycling of the concentrated water.

1, the selective drain pipe 110, which is a component of the present invention, has one side connected to the inflow side of the water return pipe 90, and a fourth electric valve 111 connected to the pipeline And drain the concentrated water.

As shown in FIG. 1, the drain branch pipe 140, which is a component of the present invention, is connected to one end of the drain pipe 100 and is sequentially connected to a fifth electric valve 141, (142).

The fifth electrically operated valve 141 is opened or closed under the control of the control device 120 so that the concentrated water passing through the drain pipe 100 at all times is supplied to or blocked from the drain pipe.

In addition, the microfilter 142 filters and removes the solid content in the concentrated water.

At this time, the micro filter 142 preferably has a size of about 0.1 mu m.

As shown in FIG. 1, one side of the mineral concentrated water storage tank 150, which is a component of the present invention, is connected to the drain branch 140 and is supplied to the concentrated water filtered through the microfilter 142.

The mineral concentrated water storage tank 150 is connected to the chemical dosing device 151 for supplying sodium hypochlorite through separate piping and the chemical quantity supply pump 152 so that sodium hypochlorite Is supplied to the inside thereof.

At this time, not only the sodium hypochlorite drug but also a known drug which is known to be harmless to the human body and which prevents the propagation of bacteria and has a cleansing function, may be substituted or added to the medicine injector 151.

It is preferable that the sodium hypochlorite chemical supplied to the mineral concentrated water storage tank 150 through the chemical dosing pump 152 is injected so as to be 3 ml / liter or less based on the residual chlorine in the mineral concentrated water storage tank 150.

The introduced medicines not only prevent the propagation of germs in the mineral concentrated water storage tank 150 but also flow into the purified water storage tank 80 included in the filtration concentrated water and supplied to the purified water storage tank 80, So that it can be prevented from breeding.

A drain drain pipe 153 for draining the concentrated water stored therein is provided at a lower portion of the mineral concentrated water storage tank 150. A drain valve of the concentrated water is connected to the control drain pipe 153, (120). ≪ / RTI >

In addition, a level meter 155 for measuring the water level is installed inside the mineral concentrated water storage tank 150.

The signal measured by the level meter 155 is transmitted to the control device 120. When the water level is low, an open signal is transmitted to the fifth electric motor 141, A part of the concentrated water passing through the drain pipe 100 is always supplied into the water storage tank 150.

When the signal measured by the level meter 155 is switched from low to high, the control device 120 operates the chemical quantity supply pump 152 for a predetermined period of time to supply a predetermined amount of medicine to the mineral concentrate storage tank 150 As shown in FIG.

As shown in FIG. 1, the purified water storage tank 80 is connected to the reverse osmosis filtration device 70 through an upper portion thereof to receive and store the treated water. The concentrated water storage pump 81a The mineral concentrated water storage tank 150 is connected to the mineral concentrated water storage tank 150 by means of the mineral concentrated water supply pipe 81 provided with the mineral concentrated water supply pipe 81 and the mineral concentrated water supply pipe 81.

That is, the purified water stored in the mineral concentrated water storage tank 150 is selectively supplied to the purified water storage tank 80.

As shown in the figure, a tertiary pressure gauge 82 for measuring the total dissolved solids value of the liquid stored in the water tank 80 is provided at one side of the water tank 80, and a pH meter 83 are provided on the other side.

The third TDS and pH meter 83 are connected to the control device 120 to provide a total dissolved solids value and pH value within the purified water storage tank 80, It is possible to operate the concentrated water supply pump 81a to adjust the total dissolved solids value and the pH value inside the purified water storage tank 80. [

As shown in FIG. 2, the control device 120, which is a component of the present invention, is supplied with power from the outside. The control device 120 includes a first temperature sensor 61a, a second temperature sensor 91, The first high pressure pump 62b, the second high pressure pump 62c, the third high pressure pump 63b, the third high pressure pump 62b, the second high pressure pump 62c, the third high pressure pump 62a, the second electric valve 63a, the third electric valve 92, The fifth electrically operated valve 141, the sixth electrically operated valve 154, the concentrated water supply pump 81a, the third water mist measuring device 82, the pH meter 83, And is electrically connected to the level meter 155.

Referring to FIG. 3, the control device 120 controls the first solenoid valve 62a (62a) according to the total dissolved solids measured by the first solenoid tester 61a, And the second motor-operated valve 63a, and selectively operates the high-pressure pumps 62b, 62c, and 63b.

A concrete control method of the control device 120 will be described below.

First, when the total dissolved solids measured by the first pressure gauge 61a is 10,000 ppm or less, the control device 120 opens the first electric valve 62a, The first high-pressure pump 62b is operated by sending an operation signal to the high-pressure pump 62b.

In this case, the first high-pressure pump 62b has a suction-discharge pressure of 22 bar, for example.

When the total dissolved solids value measured by the first TDS measuring device 61a is more than 10,000 ppm but less than 25,000 ppm, the control device 120 opens the first electromotive valve 62a and the second electromotive valve is shut off Both the first high-pressure pump 62b and the second high-pressure pump 62c send an operation signal to operate both pumps.

At this time, the second high-pressure pump 62c may be configured to have the suction-discharge-discharge pressure of 20 bar, for example, and the sum of suction-discharge pressures of the two pumps reaches 42 bar.

In addition, when the total dissolved solids value measured by the first pressure gauge 61a exceeds 25,000 ppm, the control device 120 opens the second electromotive valve 63a, and conversely, the first electromotive valve is turned off And the third high-pressure pump 63b is operated by sending an operation signal to the third high-pressure pump 63b having a discharge pressure greater than the sum of the discharge pressures of the first and second high-pressure pumps, for example, the discharge pressure of 60 bar .

Since the required reference pressure is about 20.2 kgf / cm 2 when the total dissolved solids value measured by the first pressure gage measuring device 61a is 10,000 ppm or less, And operates the first high pressure pump 62b and the second high pressure pump 62c together because the required pressure is 38.9 kgf / cm 2 when the pressure exceeds 10,000 ppm and 25,000 ppm or less.

In the case of 25,000 ppm or more and 35,000 ppm or less, only the third high-pressure pump 63b is operated because the necessary pressure is 52.3 kgf / cm 2.

On the other hand, the control device 120 controls the operation of the third and fourth electromag- netic valves 92 and 111 through signals measured by the second temperature gauge 91.

Specifically, when the total dissolved solids measured by the second TDS measuring device 91 is less than or equal to 35,000 ppm, an open signal is provided to the third electrically operated valve 92, and when the measured total dissolved solids is greater than 35,000 ppm, Thereby providing an open signal.

When the TDS of the concentrated water measured by the second TDS measuring device 91 is 35,000 ppm or less, it is necessary to supply the remaining amount of the concentrated water to the pretreating water storage tank 40 while draining half the concentrated water through the drain pipe 100 at all times When the initial TDS of the water to be stored in the raw water storage tank is low, the first high-pressure pump 62b is operated singly, or the first high-pressure pump 62b and the second high-pressure pump 62c are operated only when the pressure is less than 53 kgf / A state in which a parallel operation can be performed,

When the TDS of the concentrated water measured by the second TDS measuring instrument 91 exceeds 35,000 ppm, the required pressure of the high-pressure pump is required to be 53 kgf / cm 2 or more, so that the life of the third high-pressure pump 63b is shortened , The membrane damage of the reverse osmosis membrane is promoted because of the high pressure, and the sustainability of the facility is lowered.

The control device 120 controls the concentration of the concentrated water to be recycled, and the concentrated water at half time is drained and the concentrated water of the remaining remaining amount is also supplied to the pretreatment water storage tank selectively according to the TDS measurement value, It is possible to minimize the depletion of the groundwater source by making maximum use of the raw water collected in the book area where the amount of water withdrawn is not provided.

Particularly, through the above-described structure, it is possible to suppress the amount of water taken out from the underground water well during the period of low TDS of the water due to the increase of the rainfall amount, thereby increasing the storage period of the underground low concentration water, It becomes possible.

The control device 120 has a built-in timer to open the sixth electromotive valve 154 at a predetermined time interval and controls the fifth electromotive valve 141 according to a signal sensed by the level meter 155 Selectively opened and closed.

That is, the mineral concentrated water storage tank 150 is drained at regular intervals and the concentrated water that is always drained into the mineral water storage tank 150 is stored.

At this time, as described above, when the fifth electrically operated valve 141 is opened, the concentrated water, which always flows from the drain pipe 100 to the mineral concentrated water storage tank 150, is filtered through the microfilter 142, .

In addition, the control device 120 operates the chemical quantity supply pump 152 and controls the concentration of the concentrated water (not shown) in accordance with the total dissolved solids value and the pH value measured by the third tidal gas meter 82, the pH meter 83, And operates the fixed amount supply pump 81a.

The last step of FIG. 3 is shown for the sake of convenience. In FIG. 3, the value measured by the third temperature measuring device 82 is shown as a reference value of 300 ppm. However, the present invention is not limited thereto. It is obvious that whether the value is pH 6.5 or not can be applied as a reference value.

The operation control method of the medicine quantity feed pump 152 may be performed in accordance with the measured level change in the level meter 155 as described above.

Although the reason for washing using the timer is that the filtered concentrated water having been sterilized and supplied with sodium hypochlorite through the microfilter 142 and filtered through the medicine quantity feed pump 152 is subjected to filtration and chemical treatment Even if a certain period of time elapses, general bacteria or Escherichia coli may occur depending on characteristics of the water.

That is, by opening the sixth electromechanical valve 154 according to the timer system, the filtration concentrated water in the inside can be drained to prevent bacterial contamination through the discharge of the concentrated water.

When the interior of the sixth electric valve 154 is open, the control device 120 controls the fifth and sixth electric motors 141 and 142 via the signal detected by the level meter 155. [ So that the interior of the mineral concentrated water storage tank 150 can be cleaned.

In the preferred control method, the filtration concentrated water is discharged through the opening of the sixth electromechanical valve 154 for a certain period of time of about 1 to 5 minutes when the entire desalination plant is operated, 6 motor valve 154 and the fifth electromotive valve 141 are opened to allow the operator to enter or exit the inside of the mineral concentrated water storage tank 150 or to perform internal cleaning using a cleaning device .

Then, after the cleaning is finished, the sixth electrically operated valve 154 is shut off, the fifth electrically operated valve 141 is opened to supply the concentrated water filtered inside, and in the state where the water level is raised, A predetermined amount of medicines may be supplied through the filtration unit to perform the chemical treatment of the filtration concentrated water.

In addition, the control device 120 is configured to operate the concentrated water supply pump 81a according to the total dissolved solids value and the pH value measured by the third temperature sensor 82 and the pH meter 83 .

The reason why the concentrated water subjected to the filtration and chemical treatment through the concentrated water supply pump 81a is supplied to the purified water storage tank 80 is that when the salt concentration of the water collected in the underground water tank is below TDS 5,000 ppm, ) And the water is discharged from the reverse osmosis filtration device 70, water near to pure water having a very minimal mineral content is produced.

For example, when the TDS value of the sea water taken from the underground water tank is below 5,000 ppm, the TDS value of the water discharged after the reverse osmosis filtration device falls below 50 ppm and the pH value also drops to the 5 point range.

On the other hand, the concentration of TDS is 1.5 to 2 times higher than that of the raw water, and the pH value is usually about 7.5 to 8.5 as described above.

Normally, the drinking water is preferably within a range of about pH 6.5 to 8.5, and when the TDS value is close to 300 ppm, an appropriate amount of mineral component is included.

In other words, when filtration and chemical treatment of the filtered filtrate water are separately stored and the low concentration and the pH are lowered due to the supply of the low salt water, the filtrate concentrated water is supplied through the concentrated water supply pump 81a, It is possible to prevent side effects due to reverse osmosis filtration treatment of water.

Specifically, in order to prevent the drinking of the low mineral water generated during the process of desalinating the low-salt water, the concentrated water, which is discharged through the reverse osmosis filtration device 70, is filtered and chemically treated And is supplied to the concentrated water amount supply pump 81a under the control of the control device 120 in accordance with the third temperature gauge 82 and pH meter 83 of the purified water storage tank 80, Thereby enabling to provide mineral water containing minerals.

As the drain branch 140 is branched at the drain pipe 101, the concentration of the concentrated water discharged from the reverse osmosis filtration device 70 is increased in accordance with the salt concentration of the sea water extracted from the underground well. A deviation of the total dissolved solids value occurs.

Particularly, even if the total dissolved solids value of the concentrated water measured by the second TDS measuring instrument 91 is provided to the control device 120, as much as the change in the filtering performance of the microfilter 142 can occur, If the total dissolved solids value of the filtration concentrated water supplied to the filtration tank 150 can not be accurately grasped, the final total dissolved solids value and the pH of the purified water storage tank 80 may be adjusted to the target It may be difficult to reach the numerical value accurately.

As shown in FIG. 1, the drain branch 140 is connected to a microfilter 142 through a microfilter 142 at a point between the microfilter 142 and the mineral concentrated water storage tank 150, A fourth TDS measuring device 143 and a first pH measuring device 144 for measuring the total dissolved solids value and pH value in the water are provided and the fourth TDS measuring device 143 and the first pH measuring device 144 are installed And may be configured to be electrically connected to the device 120.

At this time, the control device 120 compares the total dissolved solids value and the pH value measured by the fourth TDS measuring device 143 and the first pH measuring device 144 with the measured values of the dissolved solids value and the pH value measured by the third TDS measuring device 82 and the pH measuring device 83 The total dissolved solids value and the pH value of the concentrate water supply pump 81a can be compared with each other to calculate the injection amount of the filtration concentrated water so as to more accurately control the operation of the concentrated water supply pump 81a.

In addition, the life of the microfilter 142 is limited, and the microfilter 142 must be periodically replaced or cleaned. If the concentrated water is passed once every three days, the life of the microfilter 142 may be shortened.

In addition, when the concentrated water passing through the micro filter 142 is drained for a predetermined period of time, the micro filter 142 is wasted as a result.

In addition, the amount of chemical consumption increases as the number of times of the cleaning of the mineral concentrated water storage tank 150, which is performed by the treatment of chemicals to suppress the generation of bacteria or fungi, increases.

At this time, the condensed water has a characteristic that the TDS value is lower than that when it is discharged from the reverse osmosis filtration device 70 by filtration.

1, one side is connected to the storage drain pipe 153, the other side is connected to the pretreating water storage tank 40, and the storage drain pipe 153 is connected to the other side, A direction control valve 161 that is electrically connected to the control device 120 and is switched in the direction of the outlet by the control of the control device 120 is provided at a connection point between the control device 120 and the filtration concentrated water stored in the storage tank drain pipe 153 And an auxiliary drain branch pipe 160 for selectively draining or supplying the water to the pretreating water storage tank 40 may be installed.

At this time, the control device 120 controls the opening / closing direction of the directional control valve 161 according to the total dissolved solids measured by the fourth TDS 143.

That is, the sixth electrically operated valve 154 is operated periodically by the timer to selectively drain the filtered concentrated water to the pretreatment water storage tank 40 in accordance with the TDS value measured by the fourth TDS measuring device 143, The amount of concentrated water drained into the water tank can be minimized.

As shown in FIG. 1, the seawater desalination plant for treating island-area waters in accordance with the present invention has the above-described structure, which comprises a connection pipe for connecting the pretreating water storage tank 40 and the second microfiltration apparatus 50, And an electromagnetic flow meter 130 may be installed in the use water transport pipe of the reverse osmosis filtration device 70 to be connected to the control device 120 so as to provide flow rate information. As in the known general water supply equipment, It will be appreciated that electronic pressure gauges may be installed and connected to the control device 120 to provide pressure information.

In addition, a level sensor is installed in each of the reservoirs, which is also connected to the control device 120 to provide the level information, and the control device 120 may control the operation of each pump or valves according to the level information. will be.

The above-described configuration uses a pump that provides a necessary pressure customized according to the TDS of the pretreated water through valve control through a control device briefly disclosed in Patent Document 1, so that maintenance of the pumps can be performed, As well as recycling of enriched water will allow you to overcome the limit of water intake in the island area.

Specifically, the reverse osmosis desalination system normally uses 65% of the raw water as concentrated water and discharges it to the drain. Only 35% of the treated water is used as purified water. This means that fresh water or low concentration water There is a limit to use in book areas where this is not desirable and there is not enough storage.

In addition, in the book area, as in Patent Document 2, it is not possible to install and operate a device for separately processing concentrated water.

In addition, when the concentrated water is supplied to the pretreatment water storage tank all the time, the TDS of the pretreated water rises and the use of the low pressure pump becomes difficult, so that only the third high pressure pump 63b is used, or the use of the third high pressure pump 63b The time is increased, which shortens the life of the pump.

Therefore, in the present invention, the normal drain pipe 100 provided with a partial opening valve 101 having a certain opening and closing ratio without draining the entire amount of concentrated water or performing a full amount of water refilling treatment is connected to the water return pipe 90 So that some of the concentrated water is immediately drained, and only a part of the concentrated water is supplied to the pretreatment water storage tank 40 so that the amount of water taken out from the underground tank can be minimized.

Further, the selective drain pipe 110 is further provided, one side of which is connected to the inflow side of the water return pipe 90, the fourth electric valve 111 is connected to the pipe, and the concentrated water is drained, A second TDS measuring device 91 is installed in the water return pipe 90 to selectively drain the concentrated water which is not immediately drained along the drain pipe 100 according to the TDS value of the concentrated water to be returned, And supplied to the storage tank 40.

When the fifth electrically operated valve 141 is opened, the concentrated water drained through the normal drain pipe 100 is partially filtered through the microfilter 142, and is introduced into the mineral concentrated water storage tank 155 and stored therein The sodium tertiary sodium chloride chemical is supplied into the mineral concentrated water storage tank 155 through the chemical quantity feed pump 152 and then the third and the fourth water temperature measuring instruments 82 and 83 installed in the purified water storage tank 80, Is supplied to the purified water storage tank 80 through the concentrated water supply pump 81a so that the TDS and the pH value of the purified water tank 80 can be adjusted to a level suitable for drinking .

The operation according to this configuration can extend the service life of the high pressure pump by preventing the load of the high pressure pump in the book area where replacement and maintenance are not easy by selectively operating the pump according to the TDS value of the received water, Part of the concentrated water is re-supplied together with the drain at all times, thereby preventing the depletion of the water source. Also, the drainage of the concentrated water to be recycled is selectively determined depending on the TDS of the concentrated water. It is possible to prevent the generation of the load of the high-pressure pump due to the fact that a portion of the concentrated water which is always drained is separately treated by filtration treatment and chemical treatment, By selectively adding the water to the water, when the water having a low TDS value is taken out, the reverse osmotic pressure filtration device The TDS and pH values are too low to prevent the insufficient minerals from being difficult for the people living in the islands.

10: raw water reservoir 20: multi-layer filtration device
21: raw water supply pump 30: primary microfiltration device
40: Pretreatment water storage tank 50: Secondary microfiltration device
51: preprocess water feed pump 60: high pressure pumping device
61: supply pipe 61a: first TDS
62: first branch tube 62a: first electric valve
62b: first high-pressure pump 62c: second high-pressure pump
63: Second branch tube 63a: Second electric valve
63b: third high-pressure pump 64: discharge pipe
70: reverse osmosis filtration device 80: treated water storage tank
81: Mineral concentrated water supply pipe 81a: Concentrated water supply pump
82: tertiary tester measuring instrument 83: pH measuring instrument
90: water return pipe 91: second TDS
92: Third electrically operated valve 100: Normally drained pipe
101: partial opening valve 110: selective drain pipe
111: Fourth motor valve 120: Control device
130: Electronic flow meter 140: Drain manifold
141: fifth electric valve 142: micro filter
143: Fourth Tissue Meter 144: First pH Meter
150: mineral concentrated water storage tank 151: chemical feeding device
152: Drug dosing pump 153: Storage tank drain pipe
154: Sixth electric valve 155: Level meter
160: Auxiliary drain branch pipe 161: Directional control valve

Claims (3)

In a seawater desalination plant,
A pretreatment water storage tank (40) for storing the pretreated water filtered by the water taken from the underground reservoir of the book site;
A supply pipe 61 connected to the pretreating water storage tank 40 and provided with a first temperature measuring device 61a for measuring the total dissolved solids value in the pretreated water, A first branch pipe 62 provided with a first hydraulic valve 62a and a first high-pressure pump 62b and a second high-pressure pump 62c serially connected to the discharge side, (62a) and the second high-pressure pump (62c) are connected to the first high-pressure pump (61) and the second high-pressure pump (62c) A second branch pipe 63 connected to the first branch pipe 62 and the second branch pipe 63 and connected to the first hydraulic valve 62a and the second branch pipe 63, (64) for discharging the pressurized water from the first branch pipe (62) or the second branch pipe (63) in accordance with the opening and closing of the second electric valve (63a) A high pressure pumping device 60;
A reverse osmosis filtration device 70 connected to the high-pressure pumping device 60 through a discharge pipe 64 and supplied with pressurized pretreatment water to filter the reverse osmosis process water to discharge treated water and concentrated water;
A second TDS measuring device 91 for measuring the total dissolved solids value in the concentrated water supplied to the inlet side of the conduit is provided on one side of the conduit and connected to the reverse osmosis filtration device 70 to receive the concentrated water, And the other end is connected to the pretreating water storage tank 40 and supplies the supplied concentrated water to the pretreating water storage tank 40;
A partial opening valve 101 having a predetermined opening and closing rate and a partially opened state is provided on the conduit, and a part of the concentrated water flowing into the water returning pipe 90 A drain pipe (100) for normal drain;
A selective drain pipe 110 having one side connected to the inlet side of the water return pipe 90, a fourth electric valve 111 connected to the conduit, and configured to drain the concentrated water;
A fifth electrically operated valve 141 is provided on the conduit so that the fifth electrically operated valve 141 is selectively energized through the drain pipe 100, A drain branch 140 through which a microfilter 142 is installed on the conduit and the concentrated water is filtered;
One side of which is connected to the drain branch 140 and the concentrated water filtered through the microfilter 142 is supplied to the inside and the other side is connected to a medicine charging device 151 for supplying sodium hypochlorite, And a drain drain pipe 153 for selectively draining the concentrated water stored therein is connected to the sixth electromotive valve 154 on the conduit while a level meter 155 for measuring the internal water level A mineral concentrated water storage tank 150 installed inside;
And the upper one side is connected to the reverse osmosis filtration device 70 by piping to receive and store the treated water and the mineral concentrated water supply pipe 81 provided with a concentrated water amount supply pump 81a on the pipe, A filtration concentrated water stored in the mineral concentrated water storage tank 150 is selectively supplied in a fixed amount and connected to the first solid acid water storage tank 150. A third solid water solidifier 82 for measuring the total dissolved solid value of the liquid stored therein is installed on one side A purified water storage tank 80 provided on the other side of the pH meter 83 for measuring the pH of the liquid stored therein;
The first and second torsion meters 61a and 91b and the first and second electric motors 61 and 62a and 63a and 63 and the third and fourth electric motors 61 and 62 are connected to the first and second torsion sensors 61a and 61b, The first high pressure pump 62b, the second high pressure pump 62c, the third high pressure pump 63b, the medicine quantity supply pump 152, the fifth electromotive valve 141, the sixth electromotive valve 154, And is connected electrically to the correction amount supply pump 81a, the third temperature measuring device 82, the pH measuring device 83 and the level measuring device 155. The total dissolved solids value measured by the first temperature measuring device 61a 62b, 62c, and 63b, selectively opening and closing the first and second electromotive valves 62a and 63a in accordance with the control signals from the first and second pressure gauges 91 and 92, The third electromotive valve 92 and the fourth electromotive valve 111 are selectively operated according to the total dissolved solids value and the timer is built in to open the sixth electromotive valve 154 at a predetermined time interval, Lt; RTI ID = 0.0 > 155 < Selectively activates and closes the fifth electromotive valve 141 in accordance with a signal from the level meter 155 and activates the medicine quantity supply pump 152 according to a signal change detected by the level meter 155, and a control device 120 configured to selectively operate the concentrated water supply pump 81a according to the total dissolved solids value and the pH value measured by the pH meter 83,
A small seawater desalination plant for the treatment of the local area water.
The method according to claim 1,
The drain branch pipe 140 is connected to the microfilter 142 and the mineral concentrated water storage tank 150 through a microfilter 142. The drain branch pipe 140 is connected to a fourth condenser water storage tank 150, A meter 143 and a first pH meter 144 are provided,
The fourth TiIS measuring device 143 and the first pH measuring device 144 are electrically connected to the control device 120,
The control device 120 compares the total dissolved solids value and the pH value measured by the fourth TDS measuring device 143 and the first pH measuring device 144 with the measured values of the dissolved solids value and the pH value measured by the third TDS measuring device 82 and the pH measuring device 83 And the operation of the concentrated water supply pump 81a is controlled by comparing the total dissolved solids value and the pH value.
A small seawater desalination plant for the treatment of the local area water.
3. The method of claim 2,
One end of the drain pipe 153 is connected to the drain pipe 153 and the other end of the drain pipe 153 is connected to the pretreatment water storage tank 40. The connection point to the drain pipe 153 is electrically connected to the control device 120 A directional control valve 161 for switching the direction of the outlet by the control of the control device 120 is provided to selectively drain the filtration concentrated water stored in the storage tank drain pipe 153 or to supply it to the pre- A branch pipe 160 is installed,
Wherein the control device (120) is configured to control the opening and closing direction of the directional control valve (161) according to the total dissolved solids value measured by the fourth temperature gauge (143)
A small seawater desalination plant for the treatment of the local area water.

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