KR101970242B1 - Water treating method and apparatus for removing VOC - Google Patents

Abstract

The present invention relates to a water treatment method and apparatus for simply and efficiently removing dissolved volatile organic compounds by stirring and layer-separation of raw water to be treated by suing a recovery agent having lower water solubility than the dissolved volatile organic compounds and having a low or high specific gravity in particular. The method comprises the steps of: (1) supplying raw water containing volatile organic compounds; (2) supplying a recovery agent having water solubility lower than the volatile organic compounds to the raw water, stirring the solution, and allowing the recovery agent and the treated water to be separated from each other; and (3) separating and discharging the separated water and the recovery agent separately.

Description

[0001] The present invention relates to a water treatment method and apparatus for removing dissolved volatile organic compounds (VOCs)

The present invention relates to a water treatment method and apparatus for removing dissolved volatile organic compounds, and more particularly to a water treatment method and apparatus for removing dissolved volatile organic compounds from raw water to be treated using a recovery agent having a water solubility lower than that of a dissolved volatile organic compound, The present invention relates to a water treatment method and apparatus for simply and efficiently removing dissolved volatile organic compounds by stirring and layer separation.

The dictionary definition of Volatile Organic Compounds (VOCs) is a generic term for liquid or gaseous organic compounds that are easily evaporated into the atmosphere due to their high vapor pressure. They are photochemical reactions in the atmosphere, Refers to a substance that generates oxidative substances and causes photochemical smog. It is a carcinogenic substance as well as air pollution, and it is a cause of global warming. The representative materials of VOC are Aliphatic HC, Aromatic HC, Halogenated HC, Ketones, Aldehydes, Glycols, Ethers, Epoxides, Epoxides, and Phenols. Aliphatic hydrocarbons, aromatic hydrocarbons, and halogenated hydrocarbons are the major components of VOCs emitted from the emission sources and account for 70% of the total VOCs.

VOCs are released into the atmosphere through various routes. They are used as organic solvents in various industrial processes and are mainly released during the process. In addition, they are released from the combustion process of automobile exhaust gas, incinerator, waste, wastewater treatment facility and households. Although it is not directly harmful to the human body, it poses a problem of environmental pollution as a photochemical smog precursor which is directly involved in the photodegradation reaction of nitrogen oxides in the air to generate secondary oxidizing substances such as ozone and aldehydes have.

Technological measures to eliminate VOCs that have environmental pollution problems are concentrated on separation recovery, detoxification (decomposition) and development of alternative substances. In the case of the detoxification treatment (decomposition), the cost of the decomposition facility and the operation cost are high, and in the case of incineration of heat, problems such as re-contamination due to secondary combustion products may occur. (Reuse using adsorption recovery) method is proposed as one of useful solutions. In particular, when the VOC is discharged at a relatively high concentration at a single outlet and is economically feasible, it is desirable to provide a collection facility to recover the adsorbed water. In the adsorption recovery method, adsorption, absorption, cooling condensation, condensation recovery and the like are used depending on the concentration of the discharged VOC and the flow rate of the exhaust gas. In some cases, these methods may be used in combination with each other. However, when the VOC is discharged at a relatively low concentration at a plurality of outlets, the adsorption recovery is not economical and its application is limited.

Korean Patent Laid-Open Publication No. 2001-0035169 entitled "Nitrification and deodorization of organic substances and odors, refractory substances in waste water, adsorption, decomposition and oxidation removal of volatile organic compounds in wastewater" And nitrification and denitrification and removal of volatile organic compounds are added to reduce the processing time of the wastewater by optimizing microbial production conditions in the organic matter, odor, and degradable materials in the wastewater, Decomposition and oxidation of volatile organic compounds by introducing a promoting agent for removing volatile organic compounds, thereby shortening the treatment time of the wastewater. The present invention is to provide a bead type and ring type sample of germanium, illite, bio-ceramic, activated carbon, and only filtration of waste water by the zeolite, TiO ₂ Can also completely eliminate the nitrogen-containing wastewater. In addition, it is possible to shorten the operation time of wastewater treatment, and at the same time, to provide an extremely useful invention which can enhance the removal efficiency of odor and refractory substances and volatile organic compounds (VOC) &Quot;

The present invention relates to a VOC's wastewater treatment apparatus. In the present invention, a reaction chamber is formed inside a wastewater treatment tank. The reaction chamber is formed to be long in a direction perpendicular to the paper surface, and has a purified water discharge port connected to a waste water inlet for supplying VOC ' s waste water to the upper end thereof and a purified water discharge port at a lower end. A plurality of pairs of first and second electrodes are arranged in the vertical direction, and the electrodes adjacent to each other in the vertical direction are alternately arranged in the polarity. Power is supplied from the power source to the electrodes. A circular wastewater flow is formed between each of the electrode pairs to form a VOC 'from the upper end to the lower end of the reaction chamber, Since the wastewater flows and forms a plurality of circular flows, it is possible to secure sufficient time for the electrical chemical reaction for purification, thereby increasing the purification efficiency and securing the maximum length of the flow channel in which the wastewater flows in the reaction chamber So that the size of the equipment can be relatively reduced. "

Korean Patent Registration No. 10-0715240 entitled " VOC adsorption recovery apparatus and method using microwave ") discloses a method of separating and recovering VOC from a VOC mixed gas in the atmosphere through microwave control The present invention relates to a VOC adsorption / recovery device and a VOC adsorption / recovery device which are capable of adsorbing and separating VOCs from a VOC mixed gas, and an adsorption / And a waveguide for transmitting microwave generated through the microwave oscillation tube to the adsorption recovery unit, an optical fiber thermometer for measuring an internal temperature of the adsorbent, A microwave discharge detector for measuring whether or not the discharge gas is discharged; And a microwave controller for comparing the measured internal temperature, discharge status, and VOC concentration with a reference value to perform feedback control of discharge and VOC concentration of the adsorbent by measuring the VOC concentration, Quot; and " suggest a method. &Quot;

The present invention relates to a VOC adsorption / recovery apparatus and a method therefor, which is capable of efficiently treating a VOC with a high absorption / desorption efficiency through electromagnetic wave control, The present invention relates to an adsorption recovery unit for adsorbing VOC in a mixed gas of VOC and desorbing the adsorbed VOC to discharge purified air, A cooling condenser for recovering the liquefied VOC by cooling and condensing the VOC desorbed by the adsorption recovery unit, and a control unit for controlling the adsorption recovery unit, the electromagnetic wave irradiation unit, and the cooling condenser The present invention provides a VOC adsorption recovery apparatus and method therefor.

Korean Patent Registration No. 10-1392579 entitled " Wastewater Treatment Device Using Filtration Module ") discloses a wastewater treatment device. The wastewater treatment device includes a filtration tank, at least one A treatment water supply line connected to the inlet port at the lower part of the filtration tank and installed with the pump on the basis of the filtration module, And a treatment water return line connected to an outlet port at the top of the filtration tank and to the treatment water supply line based on the filtration module, wherein the filtration module comprises a first filtration Layer and a second filtration layer comprising the fired zeolite carrier. &Quot;

The present invention relates to a method and apparatus for simply and efficiently removing dissolved volatile organic compounds by stirring and separating water with water to be treated using a recovery agent having a lower specific gravity than that of the dissolved volatile organic compound, A method and an apparatus are provided.

A water treatment method for removing dissolved volatile organic compounds according to the present invention comprises the steps of: (1) supplying raw water containing a volatile organic compound; (2) a treating step of supplying raw water with a recovering agent having a water solubility lower than that of the volatile organic compound, stirring the solution, and allowing the recovering agent and the treated water to be separated from each other; And (3) a separation step of separating and discharging the separated water and the recovered water, respectively.

A high boiling point recovering agent having a specific gravity of 1.1 to 2.0 or a low specific gravity recovery agent having a specific gravity of 0.1 to 0.9 may be used.

In the step (2), stirring may be repeated 2 to 5 times.

And a secondary treatment step of supplying a recovering agent to the treated water discharged in the discharging step of the separator 3, stirring the mixed solution, and then allowing the recovering agent and the water to be separated from each other.

The recovery agent can be reused and reused.

Reprocessing may be fractional distillation.

The recovery agent can be post-treated and fueled.

A water treatment apparatus for removing dissolved volatile organic compounds according to the present invention includes a mixing tank for mixing raw water containing a volatile organic compound with a recovering agent; And a separation tank for separating the recovery agent and the treatment water from each other after the raw water treatment to the recovery agent.

A stirring tank for stirring the mixture of the recovering agent and the raw water may be further included between the mixing tank and the separating tank.

And may further include a recovery agent supply tank and a raw water supply tank, wherein the recovery agent supply tank and the raw water supply tank are connected to the mixing tank.

The apparatus may further include a reprocessing device for reprocessing the separated recovery agent, and the reprocessing device is connected to the separation vessel.

The post-treatment apparatus may further include a post-treatment apparatus for post-treatment of the separated recovery agent, and the post-treatment apparatus is connected to the separation vessel.

According to the present invention, it is possible to simply and effectively remove dissolved volatile organic compounds by stirring and separating raw water with raw water having a lower water solubility than a volatile organic compound and using a recovery agent having a specific gravity of high or low specific gravity There is an effect of providing a water treatment method and apparatus.

In addition, wastewater containing refractory organic solvents, which have been difficult or impossible to treat by conventional wastewater treatment methods such as chemical treatment methods, microorganism treatment methods, ozone treatment methods and filtration methods, is water-treated by the water treatment method and apparatus according to the present invention It is advantageous in that the treatment at the time is simple and the solvents contained in the wastewater can be used as resources.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing one embodiment suitable for water treatment with a high boiling point recovery agent as a water treatment apparatus for removing dissolved volatile organic compounds according to the present invention. FIG.
FIG. 2 is a schematic view showing one embodiment suitable for water treatment with a low specific gravity recovery agent as a water treatment apparatus for removing dissolved volatile organic compounds according to the present invention. FIG.
FIG. 3 is a condition table showing GC / MSD + headspace detailed analysis conditions for VOC analysis of Examples 1 to 3. FIG.
4 is a test report showing the results of the analyzes of Examples 1 to 3 implementing the method according to the present invention.
5 is a test report showing the analysis results of Examples 4 to 6 implementing the method according to the present invention.

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

A water treatment method for removing dissolved volatile organic compounds according to the present invention comprises the steps of: (1) supplying raw water containing a volatile organic compound; (2) a treating step of supplying raw water with a recovering agent having a water solubility lower than that of the volatile organic compound, stirring the solution, and allowing the recovering agent and the treated water to be separated from each other; And (3) a separation step of separating and separating the treated water and the recovered water separately from each other.

Here, the term " dissolved volatile organic compound " is intended to mean a volatile organic compound in a state dissolved in water, and a water treatment method for removing dissolved volatile organic compounds is a method in which raw water containing a volatile organic compound is subjected to water treatment Thereby removing volatile organic compounds from the water.

Can be distinguished from the secondary treatment step described below by indicating the above-described method consisting of the supplying step of (1), the treating step of (2) and the discharging step of (3) as a "first treating step".

The supplying step of (1) comprises supplying raw water containing a volatile organic compound. The raw water containing the volatile organic compound can be supplied, for example, in a mixing tank. Herein, the term "raw water" means water which is subjected to water treatment, that is, water containing volatile organic compounds to be removed by the water treatment according to the present invention. Raw water is used as a raw water source, for example, as an organic solvent in various industrial processes, and is mainly released during the process. In addition, it may be water discharged from the combustion process of automobile exhaust gas, incinerator, trash, However, the present invention is not limited to these, and it can be understood that water including VOC is generically referred to. The raw water may be supplied directly to the mixing tank from the emission source, but may be temporarily stored in the raw water supply tank via the raw water supply tank or the like and then supplied to the mixing tank for water treatment at a constant rate.

In the step (2), the recovering agent having a water solubility lower than that of the volatile organic compound is supplied to the raw water, stirred, and then left to allow the recovering agent and the treated water to separate. In the step (2), the stirring may be performed only once, preferably 2 to 5 times, and stirring may be repeated in the mixing tank. Otherwise, the stirring may be carried out in a separate stirring tank, Stirring may be repeated in the tank. Here, " treated water " means that the volatile organic compound in the raw water is converted into the recovered water by supplying the water treated with the recovered water, that is, the recovered agent, to the raw water and agitating the volatile organic compound Is used to mean water that has been removed. If the stirring is less than one time, that is, if stirring is not performed, the removal efficiency of the volatile organic compound, which is a contaminant, transferred from the raw water to the recovering agent and removed from the raw water may not be sufficient. Conversely, Not only the processing efficiency is lowered due to an increase in time, but it is also undesirable that the removal rate of the volatile organic compounds from the raw water is not greatly different because the process efficiency is deteriorated beyond 5 times.

The discharging step (3) consists of separating and discharging the separated water and the recovering agent separately. Although the treated water is aqueous and the recovered agent is oily, it can be easily separated. However, by using a recovered agent having an appropriate specific gravity so as to facilitate separation from the treated water, separation of the treated water and the recovered agent It is possible to facilitate discharge. That is, the recovery agent may be a high boiling point recovering agent having a specific gravity of preferably 1.1 or more, more preferably 1.1 to 2.0, or a low specific gravity recovery agent having a specific gravity of preferably 0.9 or less, more preferably 0.1 to 0.9 have. The greater the difference in the specific gravity between the treated water (specific gravity of water at 4 ° C is 1) and the recovering agent, the better the layer separation can be achieved, thereby making it possible to easily separate and discharge the recovered agent from the treated water. Although the use of recycled materials with a specific gravity difference of less than 0.1 or greater than 2.0 may be possible, the use of recycled materials having such a specific gravity difference makes it difficult to select a recycled material, and even if the specific gravity difference is larger or smaller It may not be desirable because it does not show any positive effect on the removal efficiency of the volatile organic compounds of the present invention from the raw water.

The high boiling point recovery agent may be selected from organic compounds having a specific gravity higher than that of water and having a low solubility in water, i.e., water solubility, based on water, and preferably 1-chloromethane, 1,2-dichloromethane Chloride), 1,2,3-trichloromethane (chloroform), 1,2-dichloroethane, 1,1,1-trichloroethane and tetrachlorethylene, more preferably 1,2-dichloromethane (methylene chloride). The high boiling point recovery agent is characterized in that it dissolves only the water-soluble refractory VOC material and moves it to the lower layer. It has low volatility and is easy to separate from VOC materials easily after separation from water, and it is possible to reuse the recovering agent.

The low specific gravity recovery agent may be selected from organic compounds having a low specific gravity and a low solubility in water, i.e., water solubility, relative to water on the basis of water, preferably a monohydric alcohol having 4 to 12 carbon atoms, Of divalent alcohols, methyl ethyl ketone and hydrogenated light petroleum distillates, more preferably hydrogenated light petroleum distillates. Hydrotreated light petroleum distillate is a material obtained in petroleum refining process and can be purchased and used commercially. For example, it is a product obtained from petroleum refining process and has a boiling point of 100 to 350 ° C. , Hydrocarbons having from ₇ to ₂₀ carbon atoms, and CAS-No. 64742-49-8.

This low specific gravity recovery system is characterized by dissolving only the degradable VOC materials dissolved in water and moving to the upper layer. These materials are rather boiling, low in volatility, low in flammability, and can be sold directly as fuel rather than reused.

The use of the high specific gravity recovery agent causes the treated water layer to be located on the upper layer and the recovered agent layer to be positioned on the lower layer when the layer separation is performed by leaving the agitation and the use of the low specific gravity recovery agent is performed when the layer separation And the treated water layer is located in the lower layer. Although the raw water and the recovering agent can sufficiently come into contact with each other by stirring, in the case of using the high-boiling-point recovering agent, the raw water is preferably first fed to the mixing vessel, and the high- It may be desirable that the water is supplied from the upper part of the raw water to the lower part. On the other hand, when using a low specific gravity recovery agent, it may be preferable to supply the raw water first to the mixing tank, and to supply the low specific gravity recovery agent to the lower portion of the mixing tank so that the low specific gravity recovery agent is supplied upward from the bottom of the raw water . The treated water discharged in the discharge step of (3) can be directly discharged when the desired volatile organic compound is sufficiently removed, or can be applied to post treatment such as aeration treatment or microbial treatment, Can not be removed sufficiently, it can be reprocessed. Reprocessing may be secondary treatment. It is understood that it is possible to absorb the organic compound contained in the gas used in the aeration such as the activated carbon tower on the upper part of the treatment tank where the aeration treatment is performed.

That is, in the water treatment method for removing dissolved volatile organic compounds according to the present invention, the recovering agent is supplied to the treated water discharged in the discharging step of (3), and after stirring, the recovering agent and the water are left to be separated And a secondary processing step. The secondary treatment step can be understood as repeating the supply step of (1), the treatment step of (2) and the discharge step of (3), except that treatment water is used instead of raw water, It is understood that the removal efficiency of the volatile organic compound is increased by repeating the treatment, that is, the water treatment.

The recovering agent can be re-treated and re-used, and the reprocessing can be, for example, fractional distillation, but the present invention is not intended to be limited thereto and includes other purification methods that can increase the purity of the recovering agent Should be understood. The reprocessing is preferably applied when the recovering agent is a single substance. This is because the recovering agent must be a single material to enhance the purity of the recovering agent through purification or the like and to use it again for water treatment. The reprocessed recovery agent can be used again for water treatment. It is also possible to recover the volatile organic compounds contained in the recovering agent through reprocessing such as fractional distillation.

The recovering agent that is reprocessed and reused in the water treatment may be all that is used in the water treatment, but may preferably be the recovering agent recovered in the secondary treatment step. This is because the recovery agent recovered in the second treatment stage is more likely to be contaminated than the recovery agent recovered in the first treatment stage.

Alternatively, the recovery agent can be post-treated and fueled. The post-treatment for fueling may be accomplished through removal of water and / or addition of flammable materials and / or removal of nonflammable materials from the recovery agent used for water treatment in general, and the recovered agent for post- It can be used as fuel to provide heat or light by combustion where a heat source, a light source, or the like is required.

A water treatment apparatus for removing volatile organic compounds according to the present invention comprises a mixing tank for mixing raw water containing a volatile organic compound with a recovering agent; And a separating tank for separating the recovering agent and the treatment water from each other after treatment of the raw water with the recovering agent.

The mixing tank is for mixing raw water containing a volatile organic compound with a recovering agent, and may include a tank capable of containing raw water and a recovering agent, and a stirrer (including a motor) for mixing the raw water and the recovering agent. The size of the bath can be determined in proportion to the amount of raw water to be treated, and accordingly, the size of the bath can be appropriately designed according to the source of the raw water (that is, the source of the raw water contaminated with the volatile organic compound).

The separation tank performs the function of separating the recovery agent and the treated water by separating the recovery agent and the treated water after treating the raw water to the recovery agent. Since the separating tank is sufficient to perform the function of leaving the mixture of the raw water and the recovering agent, it is possible to simply arrange it without any separate facilities. Preferably, however, the separating treatment water and the recovering agent can be separately discharged It is preferable that separate outlets are formed in the upper and lower parts of the tank so that when a high boiler recovery agent is used as the recovery agent, the treated water can be discharged from the separation vessel through the upper outlet and the recovered agent through the lower outlet respectively . Conversely, when a low specific gravity recovery agent is used as the recovery agent, the recovered agent can be discharged from the separation vessel through the upper outlet port and the treated water through the lower outlet port, respectively.

Stirring is also carried out to promote the removal of the contaminants, such as volatile organic compounds in the raw water, from the raw water by treating the raw water with a recovery agent, and this stirring is preferably carried out at least once, May be repeatedly performed 2 to 5 times, and stirring may be repeatedly performed in the mixing tank. Alternatively, a stirring tank for stirring the mixture of the recovering agent and the raw water may be further included between the mixing tank and the separation tank, After the first agitation is performed, the mixture of raw water and the recovering agent is transferred to the agitating tank, and stirring may be performed again in the agitating tank.

The water treatment apparatus for removing volatile organic compounds according to the present invention may further include a recovery agent supply tank and a raw water supply tank. In this case, the recovery agent supply tank and the raw water supply tank may be connected to the mixing tank. The recovering agent feeder temporarily stores the recovering agent to continuously and reliably supply the recovering agent for water treatment to the mixing tank, and functions to supply the recovering agent to the mixing tank whenever necessary. Therefore, the size of the recovery tank may be designed to be an appropriate size proportional to the amount of raw water discharged from the source of raw water depending on the source of raw water to be treated (that is, the source of raw water contaminated with volatile organic compounds).

The water treatment apparatus for removing volatile organic compounds according to the present invention may further comprise a reprocessing apparatus for reprocessing the separated recovered agent, in which case the reprocessing apparatus is connected to the separating tank. The reprocessing device may be, for example, a fractionation still, but it is not intended that the invention be limited thereto, and it should be understood that it also includes other purification devices capable of increasing the purity of the recovery agent. The reprocessing performed in the reprocessing apparatus is preferably applied when the recovering agent is a single substance. This is because the recovering agent must be a single material to enhance the purity of the recovering agent through purification or the like and to use it again for water treatment. The reprocessed recovery agent can be used again for water treatment.

The water treatment apparatus for removing volatile organic compounds according to the present invention may further comprise a post-treatment apparatus for post-treatment of the separated recovery agent, in which case the post-treatment apparatus is connected to the separation vessel. The post-treatment of the recovery agent performed in the post-treatment apparatus may be post-treatment for fueling. The post-treatment for fueling may be accomplished through removal of water and / or addition of flammable materials and / or removal of nonflammable materials from the recovery agent used for water treatment in general, and the recovered agent for post- It can be used as fuel to provide heat or light by combustion where a heat source, a light source, or the like is required.

The water treatment apparatus for removing volatile organic compounds according to the present invention will be described with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing one embodiment suitable for water treatment with a high boiling point recovery agent as a water treatment apparatus for removing dissolved volatile organic compounds according to the present invention. FIG. 1, the raw water supply tank 11 and the high-boiling point raw material supply tank 12 are connected to the first mixing tank 13 so that the raw water and the high- 1 mixing tank 13 to be supplied. The first mixing tank 13 is provided with a stirrer driven by a motor. A first stirring tank 14 is provided adjacent to the first mixing tank 13 to receive a mixture of raw water and recovering agent from the first mixing tank 13 to enable further stirring. Therefore, a stirrer driven by a motor is also provided in the first stirring tank 14. The first separating tank 15 is provided adjacent to the first agitating tank 14 and the mixture in which the raw water and the recovering agent are mixed is allowed to be separated in the first separating tank 15. The first separation tank 15 is provided with an upper discharge port and a lower discharge port at the upper portion and a lower discharge port at the upper portion and the lower discharge port, respectively, so that the treated water is discharged through the upper discharge port of the first separation tank 15, The recovered agent is discharged through the lower outlet of the first separating tank (15). The treated water discharged from the first separating tank 15 is introduced into the second mixing tank 16 for further water treatment and the second stirred tank 17 is disposed adjacent to the second mixing tank 16, A second separation tank (18) is provided adjacent to the stirring tank (17). The second mixing tank 16, the second agitating tank 17 and the second separating tank 18 are the same as the first mixing tank 13, the first agitating tank 14 and the first separating tank 15, respectively The raw water prior to the water treatment in a state contaminated with the volatile organic compound is introduced into the first mixing tank 13 without being subjected to the raw water or water treatment, There is a difference only in that the treated water having undergone the primary water treatment is inflowed, so that repeated explanation on these will be avoided. The recovering agent flowing out of the first separating tank 15 is supplied to the re-treating device 19 where it is again supplied to the high-boiling-point recovering agent supply tank 12 through reprocessing such as fractional distillation, The recovery agent flowing out of the second separation tank 18 is treated as the first treated water and is introduced into the first mixing tank 13 as it is because the degree of contamination thereof is low, It can be used for tea water treatment. The treated water flowing out of the second separation tank 18 may be discharged as it is or may be applied to post treatment such as microbial treatment as necessary.

FIG. 2 is a schematic view showing one embodiment suitable for water treatment with a low specific gravity recovery agent as a water treatment apparatus for removing dissolved volatile organic compounds according to the present invention. FIG. Referring to FIG. 2, the raw water supply tank 21 and the low specific gravity water recovery tank 22 are connected to the first mixing tank 23 to define raw water and low specific gravity recovery agent 2 mixing tank 23 as shown in Fig. The first mixing chamber 23 is provided with a stirrer driven by a motor. A first agitating tank 24 is provided adjacent to the first mixing tank 23 and receives a mixture of raw water and recovering agent from the first mixing tank 23 to enable further agitation. Therefore, a stirrer driven by a motor is also provided in the first stirring tank 24. A first separating tank 25 is provided adjacent to the first agitating tank 24 and the mixture in which the raw water and the recovering agent are mixed is allowed to separate in the first separating tank 25. Since the upper and lower discharge ports are provided at the upper and lower portions of the first separator 25 and the low boiling point recovery agent is used here, the treated water is discharged through the lower outlet of the first separator 25, 1 separator (25). The treated water discharged from the first separating tank 25 is introduced into the second mixing tank 26 for further water treatment and the second stirring tank 27 is disposed adjacent to the second mixing tank 26, A second separation tank (28) is provided adjacent to the stirring tank (27). The second mixing tank 26, the second stirring tank 27 and the second separation tank 28 are the same as the first mixing tank 23, the first agitating tank 24 and the first separating tank 25, respectively The raw water prior to the water treatment in a state contaminated with the volatile organic compound is introduced into the first mixing tank 23 without being subjected to the raw water or water treatment, There is a difference only in that the treated water having undergone the primary water treatment is inflowed, so that repeated explanation on these will be avoided. The recovering agent flowing out of the first separating tank 25 is supplied to the re-treatment device 29 where it is supplied again to the low specific gravity recovering agent supply tank 22 through reprocessing such as fractional distillation or the like, The recovery agent flowing out of the second separation tank 28 is treated as the first treated water and is introduced into the first mixing tank 23 as it is because the degree of contamination thereof is low, It may be used for water treatment of the car or otherwise supplied to the post-treatment device 31 so as to be converted into fuel through post-treatment and used separately as fuel. For this purpose, for example, a first valve 32 and a second valve 33 may be further provided, and when the first valve 32 is opened and the second valve 33 is closed, When the first valve 32 is closed and the second valve 33 is opened, the recovered recovered agent is supplied to the post-treatment apparatus 31 So that it is possible to apply the recovering agent to the reprocessing or post-treatment by selecting the path of the recovered recovering agent as needed. The treated water flowing out of the second separation tank 28 can be discharged as it is or can be applied to post treatment such as microbial treatment as necessary.

Hereinafter, preferred embodiments and comparative examples of the present invention will be described.

The following examples are intended to illustrate the invention and should not be construed as limiting the scope of the invention.

Example  One: Heavy Recovery agent  using VOC  In the wastewater containing VOC  Experiment to remove

360 g of wastewater containing 1 wt% paint thinner (VOC) was injected into a sealed 1000 mL four-necked round flask at 25 캜 under 1 atm. To this was added 40 g of methylene chloride (specific gravity 1.326 (at 20 ° C)) as a heavy recovery agent and stirred for 30 minutes to allow the VOC material in the wastewater to be dissolved in the heavy recovery agent. The mixture was allowed to stand for 30 minutes using a 1000-ml separating funnel, and the upper and lower layers were separated into an upper layer (water layer) and a lower layer (methylene chloride layer). At this time, the VOC material dissolved in the water is dissolved in the MC layer (lower layer) and moved. The upper and lower layers were separated using a separating funnel. The residual content of benzene, toluene and xylene was analyzed by G / C / MSD + headspace method and the results were compared. The results are shown in Table 1 below. The lower layer was purified by fractional distillation and reused methylene chloride. VOC analysis GC / MSD + headspace Detailed analysis conditions are summarized in FIG.

Analysis item Raw water (㎎ / ℓ) Treated water (mg / l) Remarks benzene 20 0.03 toluene 940 0.13 Xylene 2540 Not detected Ortho-, meta-, para- sum

As shown in Table 1, it was confirmed that almost all the benzene, toluene and xylene in the raw water were almost completely removed from the water even by one-time water treatment.

Example  2: Low specific gravity Recovery agent  using VOC  In the wastewater containing VOC  Experiment to remove 1

Except that MICSOL 1620 sold by Miyu Tech Co., Ltd. as Hydrotreated Light Petroleum Distillate was used as a low specific gravity recovery agent instead of methylene chloride (specific gravity 1.326 (at 20 占 폚)) as a heavy recovery agent. . Since the low specific gravity recovery agent is used, upper and lower layer separation occurs in the upper layer (recovered layer) and the lower layer (water layer).

Analysis item Raw water (㎎ / ℓ) Treated water (mg / l) Remarks benzene 20 0.68 toluene 940 2.77 Xylene 2540 1.52 Ortho-, meta-, para- sum

As shown in Table 2, it was confirmed that nearly all the benzene, toluene and xylene in the raw water were almost completely removed from the water even by one-time water treatment.

Example  3: Low specific gravity Recovery agent  using VOC  In the wastewater containing VOC  Experiment 2 to remove

Except that MICSOL 2427 sold by MAYU TECH Co., Ltd. as Hydrotreated Light Petroleum Distillate was used as a low specific gravity recovery agent instead of methylene chloride (specific gravity 1.326 (at 20 DEG C)) as a heavy recovery agent. . Since the low specific gravity recovery agent is used, upper and lower layer separation occurs in the upper layer (recovered layer) and the lower layer (water layer).

Analysis item Raw water (㎎ / ℓ) Treated water (mg / l) Remarks benzene 20 0.23 toluene 940 0.92 Xylene 2540 0.37 Ortho-, meta-, para- sum

As shown in Table 2, it was confirmed that nearly all the benzene, toluene and xylene in the raw water were almost completely removed from the water even by one-time water treatment.

Test reports showing the results of the analyzes of Examples 1 to 3 are attached in Fig.

Example  4: Example  1 scale-up test (pilot test)

36 kg of wastewater containing 1 wt% paint thinner (VOC) was put into a closed 60 L reactor at 25 캜 under 1 atm. Then, 4 kg of methylene chloride (specific gravity 1.326 (at 20 ° C)) as a high boiling point agent was added and stirred for 30 minutes so that the VOC material in the wastewater was dissolved in the high boiling point recovering agent. After stagnating for 30 minutes, The upper layer (water layer) and the lower layer (methylene chloride layer) were used for upper and lower layer separation. At this time, the VOC material dissolved in the water is dissolved in the MC layer (lower layer) and moved. The residual content of benzene, toluene, and xylene was analyzed by G / C / MSD method and the results were compared. Are shown in Table 4 below. The lower layer was purified by fractional distillation and reused methylene chloride.

Analysis item Raw water (㎎ / ℓ) Treated water (mg / l) Remarks benzene 132 0.05 toluene 1435 0.51 Xylene 3058 0.28 Ortho-, meta-, para- sum

After separating the upper layer (water layer) separately, the sample was taken and air aeration was carried out for about 10 minutes, followed by sampling, and the presence or absence of methylene chloride was analyzed to obtain the results shown in Table 5 below.

Analysis item Width Mechanism (㎎ / ℓ) Width Climate (㎎ / ℓ) Remarks Methylene chloride 0.30 Non-detection

Example  5: Example  2 scale-up test (pilot test)

Except that MICSOL 1620 sold by Miyu Tech Co., Ltd. as Hydrotreated Light Petroleum Distillate was used as a low specific gravity recovery agent instead of methylene chloride (specific gravity 1.326 (at 20 占 폚)) as a heavy recovery agent. . Because the low specific gravity recovery agent was used, upper and lower layer segregation occurred in the upper layer (recovered layer) and the lower layer (water layer). The results are shown in Table 6 below.

Analysis item Raw water (㎎ / ℓ) Treated water (mg / l) Remarks benzene 132 0.21 toluene 1435 1.01 Xylene 3058 0.46 Ortho-, meta-, para- sum

As shown in Table 6, it was confirmed that almost all the benzene, toluene and xylene in the raw water were almost completely removed from the water by one-time water treatment.

Example  6: Example  3 scale-up test (pilot test)

Except that MICSOL 2427 sold by Miyu Tech Co., Ltd. as Hydrotreated Light Petroleum Distillate was used as a low specific gravity recovery agent in place of methylene chloride (specific gravity 1.326 (at 20 占 폚)) as a heavy recovery agent. . Because the low specific gravity recovery agent was used, upper and lower layer segregation occurred in the upper layer (recovered layer) and the lower layer (water layer). The results are shown in Table 7 below.

Analysis item Raw water (㎎ / ℓ) Treated water (mg / l) Remarks benzene 132 0.13 toluene 1435 0.50 Xylene 3058 0.19 Ortho-, meta-, para- sum

As shown in Table 7, it was confirmed that almost all the benzene, toluene and xylene in the raw water were almost completely removed from the water even by one-time water treatment.

Test reports showing the results of the analyzes of Examples 4 to 6 are attached in Fig.

As a result of synthesizing the above embodiments, it has been confirmed that the dissolved volatile organic compounds in the raw water can be effectively and simply removed by using the water treatment method and apparatus for removing dissolved volatile organic compounds.

As a result of synthesizing the above embodiments, it has been confirmed that the dissolved volatile organic compounds in the raw water can be effectively and simply removed by using the water treatment method and apparatus for removing dissolved volatile organic compounds.

Therefore, this patented technology is different from other technologies and has advantages such as high temperature, high pressure and the like, which do not require a separate device, are efficient, economical, convenient in operation, and simple in process.

While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

11, 21: raw water supply tank
12: Heavy metal recovery agent supply tank 22: Low specific gravity metal recovery tank
13, 23: first mixing tank 14, 24: first mixing tank
15, 25: first separation tank 16, 26: second mixing tank
17: 27: Second stirring tank 18, 28: Second separation tank
19, 29: Reprocessing device 31: Postprocessing device
32: first valve 33: second valve

Claims (8)

(1) a supply step of supplying raw water containing a volatile organic compound;
(2) Hydrogenated light petroleum distillate is fed to the raw water as methylene chloride or a low specific gravity recovery agent having a specific gravity of 0.1 to 0.9 as a high boiling point recovery agent having a water solubility lower than that of the volatile organic compound and a specific gravity of 1.1 to 2.0, A treatment step of supplying a high boiling point water recovery agent to the upper part of the raw water, supplying a low specific gravity water recovery agent to the lower part of the raw water, stirring and then allowing the water recovery agent and the treated water to separate; And
(3) a discharging step of separately discharging the layered treatment water and the recovering agent;
And removing the dissolved volatile organic compounds. delete The method according to claim 1,
Characterized in that the high boiling point recovery agent is selected from the group consisting of 1-chloromethane, 1,2-dichloromethane (methylene chloride), 1,2-dichloroethane, 1,1,1-trichloroethane and tetrachlorethylene A water treatment method for removal of dissolved volatile organic compounds. The method according to claim 1,
Wherein the low specific gravity recovery agent is selected from the group consisting of monohydric alcohols having 4 to 12 carbon atoms, divalent alcohols having 4 to 8 carbon atoms, methyl ethyl ketone and hydrotreated light petroleum distillates (hydrocarbons having a boiling point of 100 to 350 DEG C and having a carbon number of ₇ to ₂₀ ). ≪ / RTI > The method of claim 1, wherein the dissolved volatile organic compound is selected from the group consisting of: The method according to claim 1,
A second treatment step of supplying a recovering agent to the treated water discharged in the discharging step of the separator (3), allowing the recovering agent and the water to be separated from each other after the stirring, and
Further comprising the step of removing the dissolved volatile organic compounds. delete delete delete

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