KR101360018B1 - Method of water treatment and system using the same - Google Patents

Abstract

The present invention provides a water treatment method and a water treatment system using the same. The water treatment method comprises: a dissolved air flotation step (100) for injecting a coagulant while putting inflow water composed of brackish water and seawater in a dissolved air flotation tank (10) so as to remove suspended solids; a filtration step (200) for putting treated water discharged from the dissolved air flotation step (100) in a filtration tank (20) so as to remove pollutants; an ultrafiltration step (300) for putting the treated water discharged from the filtration step (200) in an ultrafiltration membrane (30) so as to remove pollutants; a reverse osmosis treatment step (400) for putting part of the treated water discharged from the ultrafiltration step (300) in a reverse osmosis membrane (40) so as to remove ionic harmful materials; a nanofiltration treatment step (500) for putting part of the treated water discharged from the ultrafiltration step (300) in a nanofiltration membrane (50) so as to remove ionic harmful materials; a step (910) for providing treated water, whose electroconductivity is equal to or below a reference value, among the treated water discharged from the reverse osmosis treatment step (400) or the nanofiltration treatment step (500) as drinking water or agricultural water; and a step (920) for providing treated water, whose electroconductivity is above the reference value, among the treated water discharged from the reverse osmosis treatment step (400) or the nanofiltration treatment step (500) as industrial water or urban reusable water. Therefore, the treated water can be collected economically according to the use of the treated water via the real-time water quality measurement of the treated water for each unit process and the reduction of treatment load, thereby effectively preventing the corrosion of a pipe. [Reference numerals] (AA) Seawater; (BB) Brackish water; (CC) Rainwater; (DD) Electroconductivity below or equal to 700μs/cm; (EE) Electroconductivity above 700μs/cm

Description

Water treatment method for coastal and island area and water treatment system using same {METHOD OF WATER TREATMENT AND SYSTEM USING THE SAME}

Field of the Invention The present invention relates to an environmental field, and more particularly, to a water treatment method and a water treatment system using the same.

In general, water bodies (ie, water) such as stormwater, sewage, sewage, and wastewater are subjected to various water treatment processes such as filtration and sedimentation for the purpose of prevention of river pollution and use of high-grade water.

In particular, water pollution is very serious in coastal and island regions that are relatively out of our view, and groundwater is highly dependent on lack of social infrastructure such as water, sewage, and environmental infrastructure.

However, conventionally used water treatment facilities, including coastal and island areas, are currently operating and managing treatment facilities by the material to be treated and the purpose of the treated water.

In other words, there is a problem in that it can not achieve a complex effect while making a considerable investment because it builds facilities limited to specific hazardous substances.

Also, in the conventional water treatment facility, all the processes are performed uniformly irrespective of the required quantity of the treatment water corresponding to each process and whether or not the required water quality is met.

Therefore, there is a problem that the process operation of water treatment is not efficient and unnecessary cost is required.

To solve this problem, there is an urgent need for more efficient and stable water treatment facilities for coastal and island regions where water supply is limited due to geographical and geographical conditions.

The present invention has been derived to solve the above problems, can be recovered according to the use of the water economically through real-time water quality measurement per unit process for the treated water and reduced treatment load, and effectively prevent corrosion of the pipe It is an object of the present invention to provide a water treatment method and a water treatment system using the same.

In order to solve the above problems, the present invention is dissolved air flotation step 100 that is injected into the dissolved air flotation tank 10, while injecting a flocculant to remove the suspended solids with respect to the influent consisting of brackish water and sea water; A filtration step 200 of inputting the filtration tank 20 to remove contaminants with respect to the treated water discharged from the dissolved air floating step 100; An ultra filtration step 300 for inputting the ultra filtration membrane 30 to remove contaminants with respect to the treated water discharged from the filtration step 200; Reverse osmosis treatment step 400 of inputting a portion of the treated water discharged from the ultrafiltration step 300 to the reverse osmosis membrane 40 to remove ionic harmful substances; Nanofiltration treatment step 500 of inputting the nanofiltration membrane 50 in a portion of the treated water discharged from the ultrafiltration step 300 to remove ionic harmful substances; Supplying the treated water having an electrical conductivity equal to or less than a reference value to the drinking water or agricultural water among the treated water discharged from the reverse osmosis treatment step 400 or the nanofiltration treatment step 500; A step 920 of treating water discharged from the reverse osmosis treatment step 400 or the nanofiltration treatment step 500, the treated water having an electrical conductivity exceeding a reference value to industrial water or urban reuse water; It presents a water treatment method characterized in that.

The brackish water has a salt concentration of 0.5 to 17 permil, and the seawater is preferably 35 permil or more.

Before the nanofiltration treatment step 500, the rainwater dilution step 600 for diluting the rainwater in the treated water discharged from the ultrafiltration step 300, it is preferable to further include.

The reverse osmosis treatment step 400 and the nano filtration treatment step 500, when there is a lot of rain water, compared to the amount of treated water introduced into the reverse osmosis membrane 40 of the treated water discharged from the ultrafiltration step 300. It is preferable that the amount of the treated water added to the nanofiltration membrane 50 is larger.

In the reverse osmosis treatment step 400 and nanofiltration treatment step 500, it is preferable that the integrity monitoring to measure the efficiency of the separator in real time.

Prior to the step 910 of supplying the drinking water or agricultural water and the step 920 of supplying the industrial water or the city reuse water, a Langeria index which measures and controls the Langeria index of the pipe in real time to prevent corrosion of the pipe. It is preferable to further include a control step (700).

In the langeria index control step 700, when the langeria index is less than or equal to zero, it is preferable to automatically inject liquid slaked lime into the pipe to increase the langeria index.

For the treated water discharged in the reverse osmosis treatment step 400 or nanofiltration treatment step 500, the electrical conductivity is measured in real time by a water quality measuring sensor, and the reference value of the conductivity is 700 ㎲ / It is preferable that it is 2000 mW / cm in cm and an indirect edible crop.

The dissolved air flotation step 100 to supply the treated water to drinking water or agricultural water (910) and to supply the industrial water or urban reuse water (920) is a water quality measurement sensor for the treated water discharged in each step It is desirable to control the process by measuring the quantity and water quality in real time.

Prior to the step 910 of supplying the drinking water or agricultural water and the step 920 of supplying industrial or urban reuse water, a disinfection step 800 for disinfecting to remove harmful substances in the treated water; Do.

The present invention provides a water treatment system using the water treatment method, comprising: a coagulant injecting unit (11) for injecting a coagulant with respect to an inflow of brackish water and sea water; A dissolved air flotation tank (10) operated to remove floating materials with respect to the influent; A filtration tank 20 formed to remove contaminants with respect to the treated water discharged from the dissolved air floating tank 10; An ultrafiltration membrane 30 formed to remove contaminants from the treated water discharged from the filtration tank 20; Reverse osmosis membrane 40 formed to remove some of the ionic harmful substances in the treated water discharged from the ultrafiltration membrane 30; Nanofiltration membrane 50 formed to remove some of the ionic harmful substances in the treated water discharged from the ultrafiltration membrane 30; Drinking water or agricultural water supply unit 91 for supplying the treated water having an electrical conductivity equal to or less than a reference value among the treated water discharged from the reverse osmosis membrane 40 or the nanofiltration membrane 50 as drinking water or agricultural water; Among the treated water discharged from the reverse osmosis membrane 40 or the nanofiltration membrane 50, industrial water or urban reuse water supply unit 92 for supplying treated water whose electrical conductivity exceeds a reference value to industrial water or urban reuse water; Together with a water treatment system.

In order to prevent corrosion of the pipe to which the treated water is supplied through the drinking water or agricultural water supply unit 91 and the industrial or urban reuse water supply unit 92, a Langeria index formed to measure and control the Langeria index of the pipe in real time. It is preferable to further include a control unit (70).

The rangeria index control unit, when the rangeria index is 0 or less, the slaked lime input unit 71 is formed to automatically increase the rangeria index by injecting the liquid calcined lime into the pipe;

It is preferable to further include a sterilization unit 80 formed to remove contaminants before the treated water is supplied through the drinking water or agricultural water supply unit 91 and the industrial or urban reuse water supply unit 92.

The brackish water has a salt concentration of 0.5 to 17 permil, and the seawater is preferably 35 permil or more.

The present invention can be economically recovered according to the use of the use of water through real-time water quality measurement and treatment load reduction per unit process for the treated water, and provides a water treatment method and a water treatment system using the same to effectively prevent the corrosion of the pipe.

1 is a process chart of a water treatment system using the water treatment method according to the present invention.

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

As shown in Figure 1, the water treatment method proposed in the present invention is injected into the dissolved air flotation tank 10, while injecting a flocculant to remove suspended solids with respect to the influent water consisting of brackish water and sea water. Injury step 100; A filtration step 200 of inputting the filtration tank 20 to remove contaminants with respect to the treated water discharged from the dissolved air floating step 100; An ultrafiltration step 300 which is input to the ultrafiltration membrane 30 to remove contaminants with respect to the treated water discharged from the filtration step 200; Reverse osmosis treatment step 400 of inputting the reverse osmosis membrane 40 to remove some of the ionic harmful substances of the treated water discharged from the ultrafiltration step 300; Of the treated water discharged from the ultrafiltration step 300, the nanofiltration treatment step 500 to put a portion of the nanofiltration membrane 50 to remove ionic harmful substances; Supplying the treated water having electrical conductivity equal to or less than the reference value to the drinking water or agricultural water among the treated water discharged from the reverse osmosis treatment step 400 or the nanofiltration treatment step 500; A step 920 of treating water discharged from the reverse osmosis treatment step 400 or the nanofiltration treatment step 500, the treated water having an electrical conductivity exceeding a reference value to industrial water or urban reuse water; Is done.

Here, the radix means that the salt concentration is 0.5 ~ 17 permil, the sea water is more than 35 permil.

That is, the water treatment method of the present invention is a conventional problem that when the water treatment using only seawater as the inflow water, excessive energy costs and maintenance costs are required when the SWRO (Sea Water Reverse Osmosis) treatment, which is the main treatment process due to high salt concentration To overcome this problem, we propose a method of treating both seawater and brackish water as influent.

It is most effective to blend seawater and brackish water at a ratio of 70 to 80 and 20 to 30, respectively, which significantly reduces the salt concentration of the influent, thereby reducing the processing load of the process.

Therefore, the effect of maximizing the efficiency and economics of the process can be obtained.

In addition, the water treatment method of the present invention provides a water treatment method for effectively removing seawater and brackish particulate matter, salt and trace harmful impurities, and also provides a method for supplying multi-type recycled water that satisfies the water quality standards for each use. To present.

In a conventional water treatment facility, a treatment facility is constructed for each material to be removed or for use of treated water.

However, the present invention is not a method of dividing the water by the use of the treated water, there is an advantage that can be very economical by classifying and supplying by the use of the treated water by real-time water quality measurement of the treated water for each unit process.

In addition, the area of the water treatment plant can be reduced compared with the prior art, the unit process can be reduced, which is more economical, and the efficiency of the treatment process can be improved.

In particular, the water treatment method of the present invention, before the nanofiltration treatment step 500, rainwater dilution step 600 for diluting the rainwater in the treated water discharged from the ultrafiltration step 300;

By diluting the rainwater having a low salt concentration and relatively good water quality to the treated water discharged from the ultrafiltration step 300, the salt concentration of the treated water is greatly reduced.

In the case of the nanofiltration treatment step 500 where energy consumption is relatively low in the treated water having a reduced salt concentration, the treatment load of the nanofiltration membrane 50 is effectively reduced, so that the energy efficiency is improved, and the maintenance and economy are excellent. There is this.

In order to maximize this effect, when there is a lot of rain water of the treated water discharged in the ultrafiltration step 300, compared to the amount of treated water input to the reverse osmosis membrane (40) of the treated water to be injected into the nanofiltration membrane (50) It is effective to treat the larger amount.

In addition, the water treatment method of the present invention, before the step 910 of supplying the treated water to drinking water or agricultural water and the step 920 of supplying industrial or urban reuse water, the Langerian index of the pipe to prevent corrosion of the pipe It is characterized in that the Langeria index control step 700 for measuring and controlling in real time.

The Langelia Index is an exponential representation of corrosion occurrence and degree of physical and chemical characteristics causing corrosion of piping based on the principle of precipitation of calcium carbonate.

That is, it is evaluated according to saturation, unsaturation and supersaturation of calcium carbonate in the water flowing in the pipe. Generally, when the Rangelia index is 0 or less, it means that calcium carbonate is unsaturated in water and is corrosive to the pipe.

On the other hand, when the Rangelia index exceeds 0, it means that calcium carbonate is supersaturated in water and calcium carbonate scale is generated and the corrosion inside the pipe can be suppressed.

In the present invention, when the Rangelia index of the piping is 0 or less, the liquid scoria is automatically introduced into the piping to increase the Rangelia index.

As described above, by automatically controlling the Langley index, the corrosion of the pipe is effectively prevented, the efficiency of the process is improved, and maintenance and economical efficiency are improved.

Each process according to the water treatment method of the present invention will be described in detail as follows.

First, a flocculating agent is injected into the inflow water consisting of seawater and brackish water, and the dissolved air flotation step 100 is introduced into the dissolved air flotation tank 10.

Dissolved air flotation step 100 is a commonly used process in the flotation separation method, and is a process of separating and removing by floating the floating material in the water to the surface of the water.

In particular, it is a very effective process for removing suspended solids such as oil, grease, algae and turbidity from seawater and brackish water.

The principle of removal of contaminants is to dissolve air in water under pressure and open it to the treated water, whereby air dissolved in the water becomes many fine bubbles and rises.

This bubble adheres to the suspended solids in the water, reducing the specific gravity of the suspended solids, causing the float to rise above the water.

The dissolved air flotation tank 100 has a surface load ratio much higher than that of a general settling tank, and because the residence time of the treated water is very short, it is possible to reduce the size of the tank and occupy a small area of the site.

In addition, the dissolved air flotation step 100 and the filtration step 200 corresponds to a pretreatment step before the main treatment step of the present invention, and after removing the contaminants before introducing into the reverse osmosis apparatus, Since it is possible to obtain a further effect of increasing the stability of the treated water is membrane filtration, it is possible to minimize the energy required to treat the concentrated water, as well as to secure the stability of the final treated water.

After the filtration step 200 is made to effectively remove particulate contaminants with respect to the treated water discharged from the dissolved air floating step 100, the ultrafiltration step 300 is performed.

The ultrafiltration step 300 is a process capable of oxidizing and removing hardly decomposable organic substances and heavy metals, as well as color, odor and taste causing substances.

The ultrafiltration membrane 30 filters out contaminants having a particle size of 1 to 100 nm and has an effect of removing suspended substances, proteins, and polysaccharide polymers.

Of the treated water discharged from the ultrafiltration step 300, some are introduced into the reverse osmosis membrane 40, some are characterized in that the input to the nanofiltration membrane (50).

In the case of treating the general influent, it is added to the reverse osmosis membrane 40, and if there is a lot of rain water after the step (600) of diluting the rain water, it is to be introduced into the nano filtration membrane (50).

Through the reverse osmosis treatment step 400 it can effectively remove most of the ionic material to produce pure treated water.

In addition, the reverse osmosis membrane (40) filters out substances with pollutant size of 1 nm or less, and the downtime of equipment due to frequent regeneration, which is a disadvantage of the conventional ion exchange system, chemical cost, waste of manpower, treatment of malignant wastewater, etc. It can be reasonably solved.

The nanofiltration membrane 50 filters a substance having a contaminant size of about 1 nm, and removes ions or low molecular weight substances by using a nanofiltration module.

Through this, bacteria, colloids, proteins, macromolecular organics and the like can be effectively removed.

The advantage of the reverse osmosis membrane 40 and nanofiltration membrane 50 is that it is possible to reliably remove the suspended material of a certain size or more.

In addition, there are fewer mechanically moving parts, which makes the automation efficient and does not require a large area of the facility, it is possible to operate without a coagulant, or, if necessary, only a small amount of operation management is simple.

The treated water discharged from the reverse osmosis treatment step 400 or the nanofiltration treatment step 500 undergoes a disinfection step 800 when the electrical conductivity is lower than a reference value, and then supplies the drinking water or agricultural water to the drinking water 910. When the electrical conductivity exceeds the reference value, after the disinfection step 800, a step 920 of supplying the industrial water or the city reuse water which does not significantly affect the electrical conductivity value is performed.

To this end, with respect to the treated water discharged in the reverse osmosis treatment step 400 or nanofiltration treatment step 500, the electrical conductivity is measured in real time by a water quality measuring sensor.

Here, the reference value of the electric conductivity means 700 mu s / cm for direct edible crops and 2000 mu s / cm for indirect edible crops.

In the water treatment method of the present invention, the reverse osmosis treatment step 400 and the nanofiltration treatment step 500 are characterized in that the integrity monitoring to measure the efficiency of the separator in real time.

Integrity monitoring is a monitoring system that ensures that information is only open to authorized people and can only be modified by them. To ensure this integrity, control of the physical environment of terminals and servers connected to the network, and data access restrictions Maintenance of rigorous certification procedures.

The performance of membrane separation, ie efficiency (flow rate or membrane permeability) and effectiveness (removal or selectivity), is largely influenced by various variables related to the operating environment of the process.

Therefore, it is desirable to monitor the reverse osmosis membrane 40 and the nanofiltration membrane 50 in real time.

In the water treatment method of the present invention, in all the processes from the above dissolved air flotation step 100 to supplying the treated water to drinking water or agricultural water (910) and to supplying industrial water or urban reuse water (920), respectively. The process of controlling the process by measuring the quantity and water quality in real time by the water quality measurement sensor for the treated water discharged in the step of.

As described above, by measuring each water quality in real time in all the processes, the optimum process can be performed according to the quantity of the influent water and the water quality, and the demand for the quantity of water and the quality of water to be supplied can be reliably predicted. And the amount of use can be efficiently controlled.

Therefore, there is an advantage that the maintenance of the process is improved and the production and supply of the feed water can be stably performed.

In particular, the step 910 of supplying the treated water to drinking water or agricultural water through the water treatment method of the present invention is made, which means that it can also serve as a desalination effect of sea water and brackish water.

In the seawater desalination technique using the conventional reverse osmosis process, since the recovery rate of the pretreatment process was low, a large amount of seawater had to be collected for desalination, and thus, the cost of desalination was high.

However, the water treatment method of the present invention uses the influent water consisting of sea water and brackish water, and has the advantage of simply supplying fresh water including drinking water through an economical and efficient process.

Next, a water treatment system using the water treatment method of the present invention will be described.

First, a coagulant is injected by the coagulant injection unit 11 with respect to the inflow water consisting of brackish water and sea water.

Here, the radix means that the salt concentration is 0.5 ~ 17 permil, the sea water is more than 35 permil.

Then, it is injected into the dissolved air flotation tank 10 which is operated to remove the suspended matter with respect to the inflow water, and is then introduced into the filtration tank 20 formed to remove contaminants from the treated water discharged from the dissolved air flotation tank 10. .

The treated water discharged from the filtration tank 20 is introduced into the ultrafiltration membrane 30 formed to remove contaminants.

Of the treated water discharged from the ultrafiltration membrane 30, some are put into the reverse osmosis membrane 40 formed to remove ionic harmful substances, or some are put into the nanofiltration membrane 50.

The treated water discharged from the reverse osmosis membrane 40 or the nanofiltration membrane 50 is supplied by the supply unit 91 to the drinking water or agricultural water as treated water having an electrical conductivity lower than or equal to the reference value.

Alternatively, in the treated water discharged from the reverse osmosis membrane 40 or the nanofiltration membrane 50, the treated water whose electrical conductivity exceeds the reference value is supplied by the industrial water or the city reuse water supply unit 92.

Here, in order to prevent corrosion of the pipe to which the treated water is supplied through the drinking water or agricultural water supply unit 91 and the industrial or urban reuse water supply unit 92, a Langeria index formed to measure and control the Langeria index of the pipe in real time. An index control unit 70 is provided.

The rangeria index control unit to increase the langeria index by automatically injecting liquid slaked lime into the pipe when the langeria index is less than zero through the slaked lime input unit 71.

In addition, before the treated water is supplied through the drinking water or agricultural water supply unit 91 and the industrial water or urban reuse water supply unit 92, disinfection is performed by a disinfecting unit 80 formed to remove contaminants.

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 is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

10: dissolved air flotation tank 11: flocculant injection unit
20: filtration tank 30: ultrafiltration membrane
40 reverse osmosis membrane 50 nanofiltration membrane
70: Langeria index control unit 71: slaked lime input unit
80 disinfection unit
91: drinking water or agricultural water supply
91: industrial water or urban reuse water supply
100: dissolved air floating step 200: filtration step
300: ultrafiltration step 400: reverse osmosis treatment step
500: nanofiltration treatment step 600: rainwater dilution step
700: Langeria index control step 800: disinfection step
910: supplying drinking water or agricultural water
920: supplying industrial water or urban reuse water

Claims (15)

Dissolved air floating step (100) for injecting flocculant, and injecting into the dissolved air flotation tank (10) to remove suspended solids with respect to the influent consisting of brackish water and sea water;
A filtration step 200 of inputting the filtration tank 20 to remove contaminants with respect to the treated water discharged from the dissolved air floating step 100;
An ultra filtration step 300 for inputting the ultra filtration membrane 30 to remove contaminants with respect to the treated water discharged from the filtration step 200;
Reverse osmosis treatment step 400 of inputting a portion of the treated water discharged from the ultrafiltration step 300 to the reverse osmosis membrane 40 to remove ionic harmful substances;
Nanofiltration treatment step 500 of inputting the nanofiltration membrane 50 in a portion of the treated water discharged from the ultrafiltration step 300 to remove ionic harmful substances;
Supplying the treated water having an electrical conductivity equal to or less than a reference value to the drinking water or agricultural water among the treated water discharged from the reverse osmosis treatment step 400 or the nanofiltration treatment step 500;
(920) supplying treated water having electrical conductivity exceeding a reference value to industrial water or urban reuse water among the treated water discharged from the reverse osmosis treatment step 400 or the nanofiltration treatment step 500;
And water. The method of claim 1,
The brackish water has a salt concentration of 0.5 to 17 permil, and the seawater is characterized in that more than 35 permil. The method of claim 1,
Before the nanofiltration treatment step 500,
Rainwater dilution step 600 for diluting the rainwater in the treated water discharged from the ultrafiltration step 300;
Further comprising the steps of: The method of claim 1,
The reverse osmosis treatment step 400 and nanofiltration treatment step 500
When there is a lot of rain water, the amount of treated water to be added to the nanofiltration membrane 50 is greater than the amount of treated water to be injected into the reverse osmosis membrane 40 of the treated water discharged from the ultrafiltration step 300. The water treatment method characterized by the above-mentioned. The method of claim 1,
In the reverse osmosis treatment step (400) and nanofiltration treatment step (500), the water treatment method characterized in that the integrity monitoring to measure the efficiency of the separation membrane in real time. The method of claim 1,
Prior to the step 910 of supplying the drinking water or agricultural water and the step 920 of supplying the industrial water or urban reuse water,
Langeria index control step 700 for measuring and controlling the Langeria index of the pipe in real time to prevent corrosion of the pipe;
Further comprising the steps of: The method according to claim 6,
The Langeria index control step 700
When the Langeria index is less than or equal to zero, the liquid treatment lime is automatically injected into the pipe to increase the Langeria index. The method of claim 1,
For the treated water discharged in the reverse osmosis treatment step 400 or nanofiltration treatment step 500, by measuring the electrical conductivity in real time by a water quality measurement sensor,
The reference value of the conductivity is a water treatment method, characterized in that 700 ㎲ / cm for direct edible crops, 2000 ㎲ / cm for indirect edible crops. The method of claim 1,
The step 910 of supplying the dissolved air flotation step 100 to the treated water to drinking water or agricultural water and the step 920 of supplying industrial water or urban reuse water
Water treatment method characterized in that for controlling the process by measuring the quantity and quality of the water in real time with respect to the treated water discharged in each step. The method of claim 1,
Prior to the step 910 of supplying the drinking water or agricultural water and the step 920 of supplying the industrial water or urban reuse water,
Disinfection step (800) for disinfecting to remove harmful substances in the treated water;
Further comprising the steps of: A water treatment system using the water treatment method according to any one of claims 1 to 10,
A coagulant injecting unit 11 for injecting a coagulant with respect to the inflow water consisting of brackish water and sea water;
A dissolved air flotation tank (10) operated to remove floating materials with respect to the influent;
A filtration tank 20 formed to remove contaminants with respect to the treated water discharged from the dissolved air floating tank 10;
An ultrafiltration membrane 30 formed to remove contaminants from the treated water discharged from the filtration tank 20;
Reverse osmosis membrane 40 formed to remove some of the ionic harmful substances in the treated water discharged from the ultrafiltration membrane 30;
Nanofiltration membrane 50 formed to remove some of the ionic harmful substances in the treated water discharged from the ultrafiltration membrane 30;
Drinking water or agricultural water supply unit 91 for supplying the treated water having an electrical conductivity equal to or less than a reference value among the treated water discharged from the reverse osmosis membrane 40 or the nanofiltration membrane 50 as drinking water or agricultural water;
Industrial water or urban reuse water supply unit 92 for supplying treated water having an electrical conductivity exceeding a reference value to industrial water or urban reuse water among the treated water discharged from the reverse osmosis membrane 40 or the nanofiltration membrane 50;
Water treatment system. 12. The method of claim 11,
In order to prevent corrosion of the pipe to which the treated water is supplied through the drinking water or agricultural water supply unit 91 and the industrial or urban reuse water supply unit 92, a Langeria index formed to measure and control the Langeria index of the pipe in real time. Control unit 70;
Water treatment system further comprises. 13. The method of claim 12,
The Langerhree index control unit
When the Langeria index is less than or equal to 0, the slaked lime inlet 71 formed to automatically inject the liquid lime into the pipe to increase the Langeria index;
Water treatment system further comprises. 12. The method of claim 11,
A sterilization unit 80 formed to remove contaminants before the treated water is supplied through the drinking water or agricultural water supply unit 91 and the industrial or urban reuse water supply unit 92;
Water treatment system further comprises. 12. The method of claim 11,
The brackish water has a salt concentration of 0.5 to 17 permil, and the sea water is characterized in that more than 35 permil.

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