KR101425965B1 - Method of reusing treated wastewater and system using the same - Google Patents

Abstract

The present invention provides a method for reusing treated wastewater and a system for reusing treated wastewater using the same, the method for reusing treated wastewater comprising: a filtration step (100) of putting treated wastewater into a filtration tank (10) to remove pollutants; an advanced oxidation step (200) of putting treated wastewater with electroconductivity of a standard value or lower among the wastewater, which has been discharged at the filtration step (100), into an advanced oxidation device (20) to remove and disinfect refractory pollutants; an ultrafiltration step (300) of putting the treated wastewater, which has been discharged at the advanced oxidation step (200), into an ultrafiltration device (30) to remove pollutants; step a (710) of supplying the treated wastewater, which has been discharged at the ultrafiltration step (300), for agricultural water and urban reused water; and step b (720) of supplying treated wastewater with electroconductivity greater than the standard value among the treated wastewater, which has been discharged at the filtration step (100), for industrial water or urban reused water. Therefore, treated wastewater can be recovered economically according to the use of the water and the corrosion of a pipe can be prevented effectively by measuring, in real time, the quality of the treated wastewater for each unit process and reducing treatment load.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reusing wastewater treatment water using blending,

Field of the Invention [0002] The present invention relates to an environmental field, and more particularly, to a reuse method of sewage treatment water and a reuse system of sewage treatment water 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, as the industry diversifies and becomes more sophisticated, a large amount of pollutants are emitted in various fields. As population density increases, domestic wastewater also continues to increase.

In the past, it was common to discharge sewage treatment water discharged from a sewage treatment plant to a river. However, as the need for water resource development becomes more important, the importance of reuse of sewage treatment water is increasing.

As a result, reuse of sewage-treated water is obligatory, and as shown in Table 1, water quality recommendation standards for use of reused water are provided.

Generally, wastewater from wastewater treatment plants contains significant amounts of harmful components such as soluble / non-soluble organic suspended solids including nitrogen and phosphorus, nutrients and special toxic substances.

In order to reuse these wastewater, it is necessary to reprocess the wastewater to meet water quality standards such as industrial water, agricultural water or river water.

However, conventionally, a reprocessing facility has constructed and operated a treatment facility for each substance to be treated and for use 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.

Conventional technologies related to a water treatment process for reusing wastewater treatment water include 'a system for reuse of wastewater treated water as an agricultural wastewater and a method of using the same' (Korean Patent Registration No. 10-0703233, March 28, 2007) (Korean Patent Registration No. 10-0367219, December 23, 2002), and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method and system for recovering water according to the use of water in an economical manner through real- And a system for reusing sewage treatment water using the same.

In order to solve the above-mentioned problems, the present invention provides a filtering method comprising: a filtration step (100) of putting filtrate into a filtration tank (10) to remove contaminants from sewage treatment water; An advanced oxidation step (200) of removing, from the treated water discharged from the filtration step (100), incombustible contaminants with respect to the treated water whose electric conductivity is lower than or equal to a reference value and disinfecting the treated water into the advanced oxidation apparatus (20); An ultrafiltration step (300) of putting the treated water discharged from the altitude oxidation step (200) into the ultrafiltration device (30) so as to remove contaminants from the treated water discharged from the altitude oxidation step (200); A step (710) of supplying the treated water discharged from the ultrafiltration step (300) to agricultural water, industrial water, and city reusing water; (B) a step (720) of supplying treated water having an electric conductivity exceeding a reference value among the treated water discharged in the filtration step (100) to industrial water or recycled water; and (b) We suggest a method.

Further comprising a groundwater or rainwater dilution step (400) for diluting the groundwater or rainwater with the treated water discharged from the elevated oxidation step (200) before the ultrafiltration step (300).

A disinfecting step 500 for disinfecting the treated water to remove harmful substances from the treated water prior to the a-step 710 for supplying the agricultural water or industrial water to the urban recycled water and the b-step 720 for supplying the treated water to the industrial water or city- ). ≪ / RTI >

The electrical conductivity of the treated water discharged from the filtration step (100) is measured in real time by a water quality sensor. The reference value of the electrical conductivity is 700 μS / cm for the direct edible crop, / cm. < / RTI >

(Mg / L) 6 or less, BOD (mg / L) 5 or less, chromaticity (degree) 20 or less, and pH 5.8 to 8.5, the agricultural water or industrial water, A step 710 for supplying the water to the city reusing water and a step 720 for supplying the water to the industrial water or the city reusing water are preferably performed.

(710) for supplying the distilled water to the agricultural water or industrial water, the city reused water, and the b step (720) for supplying the water to the industrial water or the city reusing water. In order to prevent corrosion of the piping, (600) for controlling the Langerhree index by controlling the Langerhree index.

In the Langerhree index control step 600, when the Langerhree index is 0 or less, it is preferable to automatically increase the Langerhree index by injecting liquid slaked lime into the pipe.

A step 710 for supplying the water from the filtration step 100 to the agricultural water or industrial water, the city reusing water, and the b step 720 for supplying the water to the industrial water or the city reusing water are carried out in the process water discharged in each step It is preferable to control the process by measuring the quantity and quality of the water by the water quality sensor in real time.

The present invention is a system for reusing sewage-treated water using the method for reusing sewage-treated water, comprising: a filtration tank (10) configured to remove contaminants from sewage-treated water; An advanced oxidation device (20) formed in the treated water discharged from the filtration tank (10) so as to remove and disinfect the refractory contaminants with respect to the treated water whose electric conductivity is lower than or equal to a reference value; An ultrafiltration device 30 configured to remove contaminants from the treated water discharged from the advanced oxidation apparatus 20; A supplying section 71 for supplying the treated water discharged from the ultrafiltration apparatus 30 to agricultural water, industrial water, and city reusing water; And a b-supplying unit (72) for supplying, from the treated water discharged from the filtration tank (10), treated water having an electric conductivity exceeding a reference value as industrial water or recycled water, System together.

(60) configured to measure and control the Rangelia index of the pipe in real time in order to prevent corrosion of the pipe through which the process water is supplied through the a feeder (71) and the b feeder (72) .

The Langerhree index control unit may further include a slurry inlet unit 61 formed to automatically increase the Langerhree index by injecting liquid slug into the pipe when the Langerhree index is 0 or less.

And a disinfection unit 50 configured to remove contaminants before the process water is supplied through the a-supply unit 71 and the b-supply unit 72.

It is preferable that the reference value of the electric conductivity is 700 mu s / cm for the direct edible crop and 2000 mu s / cm for the indirect edible crop.

The present invention can be economically recovered according to the use of the water through the measurement of the real-time water quality and the reduction of the processing load per unit process of the wastewater treatment water, and a method of reusing the wastewater treatment water effectively preventing the corrosion of the pipe, We propose a water reuse system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process chart of a system for reusing sewage water using the method for reusing sewage water 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 FIG. 1 and subsequent drawings, the method for reuse of sewage water according to the present invention includes: a filtration step (100) for inputting sewage water to a filtration tank (10) to remove contaminants; An advanced oxidation step (200) of removing, from the treated water discharged in the filtration step (100), incombustible contaminants with respect to the treated water whose electric conductivity is lower than or equal to a reference value and disinfecting the treated water; An ultrafiltration step (300) for introducing the treated water discharged from the altitude oxidation step (200) into the ultrafiltration device (30) so as to remove contaminants from the treated water discharged from the ultrafiltration step (200); A step (710) of supplying treated water discharged in the ultrafiltration step (300) to agricultural water, industrial water, and city reusing water; (B) a step (720) of supplying the treated water discharged from the filtration step (100) to the industrial water or the reclaimed water whose electric conductivity exceeds the reference value.

That is, the present invention provides a method for effectively removing contaminants and residual organic substances contained in sewage-treated water, as well as a method for effectively removing contaminants and residual organic matter contained in sewage-treated water, such as river retention water, agricultural water, municipal water, And to provide a method for supplying multi-use reclaimed water that meets water quality standards for each use.

Conventional treatment facilities for reuse of wastewater treatment water have been constructed for each substance to be removed or for use of treated water.

However, in the present invention, rather than a method of reprocessing by dividing the use of sewage treatment water by use, it is possible to measure the water quality in real time for the treatment water for each unit process, .

In addition, compared with the related art, it is possible to reduce the area of the treatment area for reuse of the wastewater treatment water, reduce the unit process cost, and improve the efficiency of the treatment process.

Particularly, the method proposed in the present invention is a groundwater or rainwater dilution step (400) in which groundwater or rainwater is diluted in the treated water discharged from the elevated oxidation step (200) before the ultrafiltration step (300) .

That is, by diluting groundwater or rainwater having comparatively good water quality compared to the wastewater treatment water to the treated water discharged in the altitude oxidation step 200, the salinity concentration of the treated water is greatly reduced.

The treatment load of the ultrafiltration device 30 is effectively reduced when the treatment water having a reduced salt concentration is supplied to the ultrafiltration device 30, which is advantageous in that the energy efficiency is improved and maintenance and economical efficiency are improved.

In addition, the method proposed by the present invention is characterized in that, prior to step a 710 of supplying treated water to agricultural water or industrial water, city water for recycling, and step 720 for supplying industrial water or city water for recycling, (600) for controlling the Rangelia index in real time to control the Rangelia index.

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, the wastewater treatment water is introduced into the filtration tank 11 to effectively remove particulate pollutants.

In the treated water discharged in the filtration step 100, an advanced oxidation step (200) is carried out for the treated water whose electric conductivity is equal to or lower than the reference value, and the treated water whose electric conductivity exceeds the reference value is treated as industrial water or recycled water Step 720 of supplying b is performed.

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.

That is, among the treated water in which the particulate pollutants are effectively removed through the filtration step 100, the treated water whose electrical conductivity exceeds the reference value is subjected to the disinfection step 500, Water or city recycled water.

The treatment water that satisfies the electric conductivity reference value is subjected to an advanced oxidation step 200 and an ultrafiltration step 300. This corresponds to the main treatment step in the process of the present invention and is performed at a low energy and high efficiency filtration step 100 Is a process capable of oxidizing and removing oxidation-resistant organic materials and heavy metals as well as chromaticity, odor and flavor-inducing substances through a high-level oxidation step (200) and an ultrafiltration step (300) by a pretreatment process.

Specifically, in the advanced oxidation step 200, ultrafine pure oxygen bubbles are supplied to the advanced oxidation apparatus 20, and oxidative decomposition and disinfection of contaminants are simultaneously performed.

It is advantageous in that it produces more OH radicals with stronger oxidizing power than conventional ozone and removes recalcitrant contaminants by using more effective and applicable treatment than ozone alone. .

The ultrafiltration stage 300 is performed with respect to the treated water discharged from the advanced oxidation stage 2000. The ultrafiltration stage device 30 filters the contaminants having a particle size of 1 to 100 nm using a filtration membrane, , A polysaccharide polymer substance, and the like.

As described above, prior to the ultrafiltration step 300, a groundwater or rainwater dilution step 400 is performed in which groundwater or rainwater is diluted in the treated water discharged from the elevation oxidation step 200, whereby the ultrafiltration device 30 ), And it is possible to obtain the effect of maximizing the treatment efficiency by balancing the necessary quantity of the supply water and the water quality as a whole.

The treated water discharged in the ultrafiltration step 300 is passed through the disinfection step 500 and then a step 710 is performed to supply the water to agricultural water, industrial water, and city water for recycling.

Particularly, in the above process, the feed water supplied through the a-step 710 for supplying the agricultural water or the industrial water, the city reused water, and the b-step 720 for supplying the industrial water or the urban reused water is the turbidity NTU 2 (Mg / L) 6 or less, BOD (mg / L) 5 or less, chromaticity (degree) 20 or less, and pH 5.8 to 8.5.

To this end, all the steps of the present invention, namely, the filtration step (100) to the aeration step (710) for supplying agricultural water or industrial water, city reusing water, and a b step (720) for supplying industrial water or city reusing water, Is characterized by controlling the process by measuring the quantity of water and the quality of water discharged from the respective stages in real time by a water quality sensor.

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.

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

First, the sewage-treated water is introduced into the filtration tank 10 to remove contaminants.

In the treated water discharged from the filtration tank 10, the refractory contaminants are removed from the treated water whose electric conductivity is equal to or lower than the reference value, and are input to the altitude oxidation apparatus 20 for disinfection.

And the treated water discharged from the advanced oxidation unit 20 is put into the ultrafiltration unit 30 so as to remove contaminants.

Then, the treated water discharged from the ultrafiltration apparatus 30 is supplied through the a supply unit 71 to supply the treated water to the agricultural water, industrial water, and city reused water.

Also, of the treated water discharged from the filtration tank 10, the treated water having an electric conductivity exceeding the reference value is supplied through the b supplying part 72 which supplies the treated water to the industrial water or the city reused water.

In order to prevent the corrosion of the pipe supplied through the a supplying part 71 and the b supplying part 72, a Langelier index controlling part 60 is provided which is configured to measure and control the Langelier index of the pipe in real time.

When the Langelier index of the pipe is 0 or less, the Langeree index control unit automatically increases the Langeree index by injecting the liquid slaked lime into the pipe through the slag inlet unit 61.

The disinfection unit 50 removes contaminants before the treated water is supplied to the agricultural water, the industrial water, and the urban recycled water through the a supply unit 71 and the b supply unit 72.

The reference value of electrical conductivity above means 700 μS / cm for direct edible crops and 2000 μS / cm for indirect edible crops.

As described above, the sewage treatment water reuse system of the present invention is an economical process through real-time water quality measurement and processing load reduction in silver unit process, and can be sorted according to the use of reused water and recovered.

Therefore, there is no need to carry out the process in accordance with the use purpose of the treated water, which is advantageous in that it is more efficient and economical.

In addition, it is a system that can effectively prevent corrosion of piping and maximize maintenance and efficiency of process.

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: Filtration tank 20: Advanced oxidation device
30: ultrafiltration device 50: disinfection unit
60: Langerian index control part 61: Hydrated lime input part
71: a supply section 72: b supply section
100: Filtration step 200: Advanced oxidation step
300: ultrafiltration step 400: rainwater dilution step
500: disinfection step 600: Langerhree index control step
710: a step to supply agricultural water or industrial water as urban recycled water
720: Step b to supply industrial water or city water

Claims (13)

A filtration step (100) of charging the filtration tank (10) to remove contaminants from sewage treatment water;
An advanced oxidation step (200) of removing, from the treated water discharged from the filtration step (100), incombustible contaminants with respect to the treated water whose electric conductivity is lower than or equal to a reference value and disinfecting the treated water into the advanced oxidation apparatus (20);
An ultrafiltration step (300) of putting the treated water discharged from the altitude oxidation step (200) into the ultrafiltration device (30) so as to remove contaminants from the treated water discharged from the altitude oxidation step (200);
A step (710) of supplying the treated water discharged from the ultrafiltration step (300) to agricultural water, industrial water, and city reusing water;
(B) a step 720 of supplying the treated water having the electric conductivity exceeding the reference value among the treated water discharged from the filtration step 100 to the industrial water or the reclaimed water
Wherein the wastewater treatment method comprises the steps of: The method according to claim 1,
Prior to the ultrafiltration step 300,
A groundwater or rainwater dilution step (400) in which groundwater or rainwater is diluted in the treated water discharged in the elevation oxidation step (200);
The method of claim 1, further comprising: The method according to claim 1,
Prior to step a 710 of supplying the agricultural water or industrial water, city reusing water, and step b 720 of supplying the industrial water or city reusing water,
A disinfection step (500) for disinfecting the treated water to remove harmful substances;
The method of claim 1, further comprising: The method according to claim 1,
The electrical conductivity of the treated water discharged in the filtration step (100) is measured in real time by a water quality sensor,
Wherein the reference value of the electric conductivity is 700 mu s / cm for the direct edible crop and 2000 mu s / cm for the indirect edible crop. The method according to claim 1,
(Mg / L) 6 or less, BOD (mg / L) 5 or less, chromaticity (degree) 20 or less, and pH 5.8 to 8.5, the agricultural water or industrial water, A step (710) for supplying the water to the city reusing water, and a step (720) for supplying the water to the industrial water or the city reusing water. The method according to claim 1,
Prior to step a 710 of supplying the agricultural water or industrial water, city reusing water, and step b 720 of supplying the industrial water or city reusing water,
(600) for controlling and measuring the Langerie index in real time to prevent corrosion of the pipe;
The method of claim 1, further comprising: The method according to claim 6,
The Langerhree index control step 600
Wherein when the Langerhree index is 0 or less, the Lengelia index is increased by automatically injecting liquid slaked lime into the pipe. The method according to claim 1,
A step 710 for supplying the filtration step 100 to the agricultural water or industrial water, city reusing water, and b step 720 for supplying the water to the industrial water or city reusing water
Wherein the water quality measuring sensor measures the quantity and quality of the treated water discharged in each step in real time. A system for reusing sewage-treated water using the method for reuse of sewage-treated water according to any one of claims 1 to 8,
A filtration tank (10) configured to remove contaminants from sewage treatment water;
An advanced oxidation device (20) formed in the treated water discharged from the filtration tank (10) so as to remove and disinfect the refractory contaminants with respect to the treated water whose electric conductivity is lower than or equal to a reference value;
An ultrafiltration device 30 configured to remove contaminants from the treated water discharged from the advanced oxidation apparatus 20;
A supplying section 71 for supplying the treated water discharged from the ultrafiltration apparatus 30 to agricultural water, industrial water, and city reusing water;
A b-supplying unit 72 for supplying, from the treated water discharged from the filtration tank 10, treated water whose electric conductivity exceeds a reference value as industrial water or recycled water;
Wherein the waste water treatment system is a waste water treatment system. 10. The method of claim 9,
A Langerhree index control unit 60 configured to measure and control the Langerhree index of the pipe in real time in order to prevent corrosion of the pipe to which the process water is supplied through the a feeder 71 and the b feeder 72;
Wherein the system further comprises: 11. The method of claim 10,
The Langerhree index control unit
A slurry feeding part 61 formed so as to automatically increase the Rangelia index by injecting liquid slurry into the pipe when the Rangelia index is 0 or less;
Wherein the system further comprises: 10. The method of claim 9,
A disinfecting unit 50 configured to remove contaminants before the treated water is supplied through the a supplying unit 71 and the b supplying unit 72;
Wherein the system further comprises: 10. The method of claim 9,
The reference value of the electric conductivity is
Wherein the reusing system is 700 占 퐏 ec / cm for a direct edible crop and 2000 占 cm / cm for an indirect edible crop.

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