KR20170096455A - Treatment Method and Apparatus of Contaminated Water Containing TNT or Aromatic Compounds - Google Patents

Abstract

The present invention separates the solvent from the wastewater by using a pressure drop at a room temperature of the wastewater containing TNT or an aromatic compound and distilling and liquefying only water (H ₂ O) as a solvent in the wastewater by using a vacuum The present invention relates to a method and an apparatus for treating contaminated water containing TNT or an aromatic compound so as to reduce the amount of waste and the treatment cost,
Contaminants and solvents were separated from the wastewater containing pollutants such as benzoic acid and TNT as pollutants at room temperature using a flash evaporator and a condenser and a system equipped with two branching devices, To be extracted separately.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for treating contaminated water containing TNT or an aromatic compound,

The invention comprises, or in particular, the water (H ₂ O) solvent in the waste water by using a vacuum relates to the aromatic compound is dissolved in the waste water to a technique for separating the solvent from the waste water by using the pressure drop in a condition of room temperature to TNT The present invention relates to a method and an apparatus for treating contaminated water containing TNT or an aromatic compound so as to reduce the amount of waste and treatment cost by distilling and liquefying the same.

With the development of science and industry since the Industrial Revolution, the amount of waste derived therefrom has also increased exponentially. Since the amount of these wastes has not been so high since the Industrial Revolution, the risk has not risen. However, not only the amount of wastes but also the kinds of wastes have been released into harmful substances, .

These wastes are causing environmental problems such as desertification, red tide, and global warming, and quick measures are still needed because there are no proper emission regulations or treatment measures. Especially, in the case of munitions wastes, not only the weapons used but also the unused weapons that have been set according to the weapons have to be disposed of. Therefore, the amount of waste is increasing more rapidly.

Among the various types of weapons, explosive properties have been used extensively in the military industry in the case of 2,4,6-trinitrotoluene (TNT), especially 2, 4, 6-trinitrotoluene (TNT). These TNTs are released in the form of an aqueous solution called Red Water after use or after shell processing.

However, in the case of red water, it is difficult to decompose naturally because TNT itself is a refractory substance. In EPA (Environmental Protection Agency), it is classified as Group C (Possible Carcinogen) There is an artificial follow - up process. In addition, urgent treatment for ammunition including TNT with a life cycle has been urged.

At present, in Korea, Ammunition Stockpiles Reliability Program (ASRP) is being implemented for ammunition including TNT. In this evaluation, ammunition which is determined to be unserviceable is incinerated.

However, incineration treatments are considered to be economically disadvantageous in that they can not recycle gunpowder inside the ammunition, which can cause environmental problems of unburned reactants, dioxins, and furans. Furthermore, since the amount of ammunition passing through the present age is increasing, it is urged to develop eco-friendly technology that will replace the aforementioned incineration treatment.

Accordingly, techniques for replacing the incineration process have been developed. Such incineration substitution technology has been started in the United States in the 1990s. At that time, the United States found that unburned reactants, dioxins, and furans were not removed during the incineration of TNT, and started to develop technologies to replace them. The technology that is developed at this time is collectively referred to as incineration substitution technology. The common point of these methods is that no harmful substances such as unburned reactants or dioxins are discharged in treating the chemical substances in wastewater.

The incineration alternative technology is classified into a method of decomposing by chemical oxidation or reduction, a method of physically adsorbing and decomposing, and a method of decomposing naturally using plants and microorganisms. Here, in the case of the method of decomposing by chemical oxidation, it was recognized from the viewpoint of treatment efficiency and then developed into a high oxidation process. The advanced oxidation process corresponds to a method of decomposing chemical substances in wastewater by producing hydroxyl radicals, which is one of the strongest oxidizers present in nature, in the process and using these hydroxyl radicals.

This high-level oxidation process is followed by supercritical fluid oxidation in the 2000s. Supercritical fluid oxidation is a method of using an oxidant and advancing the reaction in the supercritical region. This supercritical fluid oxidation method is considered to be the best treatment method in terms of decomposition ability because it completely decomposes more than 99.9% of chemical substances in 5 minutes. However, due to extreme conditions in the supercritical state, corrosion in the reactor is severe, The amount of energy consumed is so high that it needs a way to replace it.

In this situation, it is the technology that physically separates not the decomposition treatment method that emerged. In the past, there was a method of separating by using the physical properties of an adsorbent such as activated carbon. However, since the activated carbon itself adsorbed by the chemical substances became toxic, unlike other materials, it was impossible to separate them from the activated carbon, . What follows is the separation method using the physical characteristics of various substances constituting the wastewater.

KR 10-2005-0002620 A KR 10-0970425 B1 KR 10-2011-0061327 A KR 10-2015-0003818 A

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in order to solve the problems of the prior art described above, and it is an object of the present invention to provide a method and apparatus for separating a liquid in a wastewater by evaporating a solvent in a wastewater under low pressure, A method and a device for treating TNT or an aromatic compound-containing contaminated water which can reduce the cost and the amount of waste required for treating TNT or contaminated water containing an aromatic compound by discharging the separated waste according to the evaporation of The purpose is to provide.

In order to accomplish the above object, the present invention provides a method for treating TNT or an aromatic compound-containing contaminated water, comprising the steps of: supplying TNT or an aromatic compound-containing contaminated water under a pressure of 0.01-1.0 bar absolute pressure and 0-80 ° C. Separating the solvent from the waste by evaporating the solvent by distillation; Discharging the separated waste to the outside and heat-exchanging the low temperature refrigerant and the evaporated solvent to liquefy the solvent; And separating the liquefied refrigerant by gas-liquid separation to extract the fresh water and discharging the gaseous refrigerant to the outside.

 According to the method for treating contaminated water containing TNT or an aromatic compound of the present invention, the temperature of the low temperature refrigerant is 0 to 10 占 폚.

According to the method for treating contaminated water containing TNT or an aromatic compound of the present invention, the low-temperature refrigerant of the condenser is ethylene glycol.

The apparatus for treating contaminated water containing TNT or an aromatic compound according to the present invention comprises a flash evaporator for treating TNT or contaminated water containing an aromatic compound by distillation under a low-temperature and low-pressure condition to evaporate the solvent; A condenser for liquefying the solvent through heat exchange between the evaporated solvent and the low temperature refrigerant; A first branch portion for separating the evaporated solvent and the waste, discharging the waste to the outside, and supplying the evaporated solvent to the condenser; A secondary branching portion for liquefying the solvent by the condenser and then separating the solvent supplied through the primary branching portion; A vacuum inducing unit for maintaining a vacuum inside the system and discharging the gaseous solvent separated from the secondary branching unit to the outside; A solvent vessel in which the liquid state solvent separated from the secondary branching unit is stored; And a pair of pressure control valves respectively installed in the waste water pipe connected to the flash evaporator and the waste discharge pipe connected to the primary branch to regulate the pressure inside the system.

According to the apparatus for treating contaminated water containing TNT or an aromatic compound of the present invention, the flash evaporator is provided with a heating member for temperature control, and is characterized in that vacuum distillation is performed at a temperature of 0 to 80 ° C .

Further, according to the apparatus for treating contaminated water containing TNT or an aromatic compound of the present invention, the condenser is characterized by using ethylene glycol at 0 to 10 캜 as a low-temperature refrigerant.

According to the apparatus for treating contaminated water containing TNT or an aromatic compound according to the present invention, the vacuum induction unit and the pressure control valve control the pressure so that the inside of the system satisfies a pressure condition of absolute pressure of 0.01 to 1.0 bar do.

According to the apparatus for treating contaminated water containing TNT or an aromatic compound of the present invention, the vacuum inducing unit is an ejector or a vacuum pump using a fluid.

The method and apparatus for treating polluted water containing TNT or an aromatic compound of the present invention can reduce the amount of waste by separating fresh water and pollutants, And the processing cost can be greatly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a method for treating contaminated water containing TNT or an aromatic compound according to the present invention. FIG.
2 is a block diagram schematically showing an apparatus for treating contaminated water containing TNT or an aromatic compound according to the present invention.

Hereinafter, a method and apparatus for treating TNT or an aromatic compound-containing contaminated water according to the present invention will be described with reference to the accompanying drawings. Unless otherwise defined herein, all technical and scientific terms used herein have their generally accepted meaning for all professionals engaged in the relevant field of technology.

As shown in FIG. 1, TNT or an aromatic compound-containing contaminated water containing TNT or an aromatic compound is treated at a pressure of 0.01 to 1.0 bar under absolute pressure and at a temperature of 0 to 80 ° C Evaporating the solvent by vacuum distillation to separate the waste from the waste; Discharging the separated waste to the outside and heat-exchanging the low temperature refrigerant and the evaporated solvent to liquefy the solvent; And separating the liquefied refrigerant by gas-liquid separation to extract the fresh water and discharging the gaseous refrigerant to the outside.

Here, ethylene glycol may be used as the low-temperature refrigerant, and the temperature of the low-temperature refrigerant is preferably 0 to 10 ° C.

As shown in FIG. 2, an apparatus for treating TNT or an aromatic compound-containing wastewater according to the present invention is a device for treating TNT or contaminated water containing an aromatic compound by distillation treatment under a low- (112); A condenser 115 for liquefying the solvent through heat exchange between the evaporated solvent and the low temperature refrigerant; A primary branch 114 separating the evaporated solvent and waste and discharging the waste to the outside and supplying the evaporated solvent to the condenser 115; A secondary branching section 116 for liquefying the liquid by the condenser 115 and then separating the supplied solvent through the primary branching section 114; A vacuum inducing unit 118 for allowing the inside of the system to maintain a vacuum and discharging the gaseous solvent separated from the secondary branching unit 116 to the outside; A solvent container 117 such as a flask in which the liquid state solvent separated from the secondary branching section 116 is stored; A pair of pressure control valves 111 (which are respectively installed in the waste water pipe 2 connected to the flash evaporator 112 and the waste discharge pipe 4 connected to the primary branch part 114) 113).

The flash evaporator 112 and the primary branch 114 are connected to each other through a connection pipe 3. The primary branch 114 and the condenser 115 are connected to a first solvent pipe 6) and the second solvent tube (7) through which the liquid solvent flows. The first branch portion 114 and the second branch portion 116 are connected by a third solvent pipe 8 and the second branch portion 116 and the solvent container 117 are connected by a fourth solvent pipe And the secondary branching section 116 and the vacuum inducing section 118 are connected to the gas pipe 10. The condenser 115 is provided with a pair of refrigerant pipes 11 and 12 through which the low-temperature refrigerant flows and is discharged.

The flash evaporator 112 is equipped with a heating member (not shown) for controlling the temperature, and is configured to perform vacuum distillation at a temperature of 0 to 80 ° C, preferably at a temperature of 25 to 80 ° C. The condenser 115 is preferably made of ethylene glycol at 0 to 10 ° C as low-temperature refrigerant, and is configured so that the evaporation solvent therein is liquefied by low-temperature refrigerant flowing through the outer wall.

The vacuum inducing unit 118 and the pressure regulating valves 111 and 113 control the pressure of the system to maintain the absolute pressure of 0.01 to 1.0 bar, preferably 0.05 to 0.5 bar.

The method and apparatus for treating contaminated water containing TNT or an aromatic compound of the present invention having the above-described structure are characterized in that the flash vaporizer (Flash Vaporizer) is operated at a low pressure to promote evaporation at a temperature lower than the actual boiling point, Using ethylene glycol as a refrigerant in the condenser, the fresh water is extracted from the wastewater using the principle of condensing gaseous solvents.

The wastewater 1 made of TNT or an aromatic compound-containing wastewater is supplied to the flash evaporator 112 through the wastewater pipe 2 and the flash evaporator 112 distills the wastewater through heating and decompression, The wastewater (1) is separated into an evaporating solvent and a waste (5) by evaporating the corresponding water. The separated evaporation solvent and waste 5 are completely separated from the primary branch 114 and the evaporation solvent is introduced into the condenser 115 through the first solvent pipe 6 and the waste 5 is introduced into the waste discharge pipe 4 ). ≪ / RTI >

The evaporated solvent flowing into the condenser 115 is liquefied through heat exchange with the low temperature refrigerant flowing through the outer wall of the condenser 115. The liquefied refrigerant flows through the second solvent pipe 7 to the primary branch 114, . The liquefied refrigerant in the first branch portion 114 moves to the second branch portion 116 through the third refrigerant pipe 8 and the second branch portion 116 separates the liquefied refrigerant from the gas, Components can be supplied to the vacuum induction unit 118 through the gas pipe 10 to be discharged to the outside and the liquid component can be collected in the solvent container 117 through the fourth refrigerant pipe 9, So that fresh water can be extracted.

In other words, the wastewater is distilled by heating and depressurization to evaporate the solvent, and liquefy the solvent to constitute a water purification cycle for generating fresh water, and the waste 5 separated from the solvent is discharged to the outside.

The above-described water purification cycle forms evaporation conditions for the internal wastewater through heating and depressurization of the flash evaporator 112, liquefies the vaporized solvent by heat exchange with the low-temperature refrigerant, and collects the liquefied solvent to extract the fresh water . At this time, the important operating condition is the operating temperature and pressure of the flash evaporator 112, the temperature of the condenser 115, and the organic matter concentration of the extracted fresh water.

<Experimental Example>

In order to verify the effect of the present invention, a fresh water extraction test was conducted by injecting a benzoic acid aqueous solution and a TNT aqueous solution into the waste water pipe (2). At this time, the fresh water was extracted by changing the absolute pressure to 0.05 to 0.1 bar under the condition of the flash evaporator 112 at 30, 40, 50 and 60 ° C. The low temperature refrigerant of the condenser 115 was cooled to 0 And the test was carried out. In the case of extracted fresh water, the concentration of internal pollutants was measured using a total organic carbon analyzer. The results are shown in Tables 1 and 2 below.

Table 1 shows the test results for benzoic acid aqueous solution, and Table 2 shows the test results for the aqueous TNT solution.

As shown in Table 1 and Table 2, the extracted fresh water contained only ppb and ppm organic matter, and the concentration of fresh water extracted at low temperature was lower than that of fresh water extracted at high temperature Able to know. Especially, in case of benzoic acid, fresh water close to pure water having a concentration of at least 21 ppb was extracted, and even TNT had a concentration higher than benzoic acid at a concentration of several hundred ppb, but it was confirmed to be quite purified.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be appreciated by those of ordinary skill in the art that numerous changes and modifications can be made to the present invention without departing from the scope of the present invention. And all such modifications and changes as fall within the scope of the present invention are therefore to be regarded as being within the scope of the present invention.

1 ... wastewater
2 ... waste water pipe
3 ... connector
4 .... waste pipe
5 ... waste
6, 7, 8, 9 ... solvent tube
10 ... gas pipe
11, 12 ... refrigerant tube
111 ... pressure regulating valve
112 ... flash evaporator
113 ... Pressure regulating valve
114 ... primary branch portion
115 ... condenser
116 ... 2nd branch
117 ... solvent container
118 ... Vacuum pump

Claims (8)

Separating the contaminated water containing TNT or an aromatic compound by vacuum distillation at a pressure of 0.01 to 1.0 bar under a pressure of 0 to 80 ° C by evaporating the solvent and the waste;
Discharging the separated waste to the outside and heat-exchanging the low temperature refrigerant and the evaporated solvent to liquefy the solvent;
And separating the liquefied refrigerant by gas-liquid separation to extract the fresh water and discharging the refrigerant in a gaseous state to the outside; and treating the contaminated water containing TNT or an aromatic compound. The method according to claim 1,
Wherein the temperature of the low-temperature refrigerant is 0 to 10 占 폚. 3. The method according to claim 1 or 2,
Wherein the low-temperature refrigerant is ethylene glycol. A flash evaporator 112 for evaporating the solvent by subjecting the contaminated water containing TNT or an aromatic compound to distillation treatment under a low-temperature and low-pressure condition;
A condenser 115 for liquefying the solvent through heat exchange between the evaporated solvent and the low temperature refrigerant;
A primary branch 114 separating the evaporated solvent and waste and discharging the waste to the outside and supplying the evaporated solvent to the condenser 115;
A secondary branching section 116 for liquefying the liquid by the condenser 115 and then separating the supplied solvent through the primary branching section 114;
A vacuum inducing unit 118 for allowing the inside of the system to maintain a vacuum and discharging the gaseous solvent separated from the secondary branching unit 116 to the outside;
A solvent container 117 such as a flask in which the liquid state solvent separated from the secondary branching section 116 is stored;
A pair of pressure control valves 111 (which are respectively installed in the waste water pipe 2 connected to the flash evaporator 112 and the waste discharge pipe 4 connected to the primary branch part 114) 113). &Lt; / RTI &gt; An apparatus for treating contaminated water comprising TNT or an aromatic compound. 5. The method of claim 4,
The flash evaporator 112 has a heating member for temperature control,
Wherein the vacuum distillation is performed at a temperature of 0 to 80 ° C. 5. The method of claim 4,
Wherein the condenser (115) uses ethylene glycol at 0 to 10 占 폚 as a low-temperature refrigerant. 5. The method of claim 4,
Wherein the vacuum induction unit 118 and the pressure regulating valves 111 and 113 control the pressure so that the inside of the system satisfies a pressure condition of an absolute pressure of 0.01 to 1.0 bar. Processing device. 8. The method according to any one of claims 4 to 7,
Wherein the vacuum inducing unit (118) is an ejector or a vacuum pump using a fluid.

Images