KR20120052498A - Catalyst wet air oxidation using gravity pressure vessel - Google Patents

Abstract

PURPOSE: A deep well-based catalytic wet oxidation apparatus is provided to save costs and construction periods by being equipped with a microbubble generator and reducing the depth of excavation for installing a deep well guiding pipe. CONSTITUTION: A deep well guiding pipe(10) is vertically buried. A guiding pipe(11) is arranged in the deep well guiding pipe. The lower part of the guiding pipe is spaced apart from the bottom of the deep well guiding pipe to form a flow path through which wastewater flows. A catalyst part(12) is installed at the lower side of the deep well guiding pipe to implement oxidation to the wastewater. A microbubble generator(13) is installed on the upper side of the catalyst part. The microbubble generator is arranged at the lower side of a gas injecting line(14). A heat exchanging part is arranged at the upper side of the deep well guiding part.

Description

Simjung catalytic wet oxidation equipment {CATALYST WET AIR OXIDATION USING GRAVITY PRESSURE VESSEL}

The present invention relates to catalytic wet oxidation, and more particularly, to reduce the cost of construction by reducing the excavation depth of the heart well line that is buried underground for wastewater treatment, and to enable more effective wet oxidation.

In modern society, water pollution is a serious problem due to the increase of population, urbanization and development of various industries. In particular, in the case of industrial wastewater, pollutants are diversified due to the increased load of pollutants and the use of new synthetic chemicals, and pollution by hardly decomposable substances is increasing. In order to reduce the water pollution by wastewater, legal regulations are being strengthened, and in order to prepare for this, it is necessary to develop a technology capable of effectively treating wastewater, such as advanced oxidation treatment technology, in addition to the methods that have been used up to now. In particular, the development of a relatively compact compact wastewater treatment system capable of treating wastewater containing toxic or hardly degradable pollutants and high concentration wastewater should be made.

The nature and concentration of pollutants in industrial waste water depend on the raw materials used. Industrial wastewater is generally discharged at a higher temperature than domestic sewage or agricultural water. Industrial wastewater contains high concentrations of highly toxic compounds, which require special treatment for separation, modification and decomposition. Various biological, physical, and chemical treatment methods and combinations thereof are used to achieve the above objectives, but have limitations in terms of applicability, efficiency, and cost. In particular, phenols and phenolic compounds among the harmful organic compounds included in industrial wastewater have received a lot of attention for the past 20 years because they are toxic and easily pollute the water. In addition, it is used as a model compound in the advanced water treatment process because it is produced as an intermediate product in the oxidation reaction of a high molecular weight aromatic carbon compound.

Wet oxidation is a water treatment technology that oxidizes organic matter in aqueous solution by using oxygen in air as an oxidant under high temperature (125 ~ 320 ℃) and high pressure (0.5 ~ 20MPa), and oxidizable organic and inorganic substances dissolved or dispersed in liquid contaminants. It can be treated and is suitable for the treatment of wastewater which is difficult to treat biologically due to its high concentration or high toxicity. Through wet oxidation, organics in aqueous solutions are converted to carbon dioxide and other harmless end products. The higher the temperature, the better the oxidation reaction and the emissions usually contain low molecular oxygen-containing compounds. The degree of oxidation mainly depends on the temperature, the oxygen partial pressure, the residence time in the reactor, the nature of the contaminants being oxidized under the reaction conditions, and the oxidation reaction conditions depend on the purpose of the treatment (pretreatment for complete oxidation or biological treatment).

When wet oxidation is used for wastewater treatment, there are several advantages, such as water treatment by a single process, high concentration wastewater can be treated without dilution, simultaneous removal of COD, BOD and nitrogen, and color removal and sterilization can be performed simultaneously. have. In addition, NOx, SOx, odor is not produced from the exhaust gas, the sludge is not produced, the operation is simple, the reactor is stable, and the installation place has the advantages such as small. However, there is a problem that an expensive material that can withstand the harsh reaction conditions such as high temperature and high pressure is used. In order to reduce the overall process cost for treating hard-degradable contaminants by mitigating reaction conditions such as temperature and pressure, catalytic wet oxidation is proposed, in which a catalyst is added to the wet oxidation process to participate in the reaction. Wet catalysts have also been developed, mainly composed of transition metal complex oxides and precious metals.

However, the wet oxidation method using the conventional catalyst has a problem in that it is more difficult to install and consumes energy more than the biological oxidation process and the advanced oxidation process.

Therefore, in recent years, in order to obtain a high pressure state for wastewater treatment, a deep wet oxidation method has been proposed to excavate more than 1,000 m underground to install a deep well.

However, such a deep wet oxidation method has various problems such as an increase in construction period and cost due to excavation.

The present invention has been proposed to improve the above problems in the conventional wet-wet oxidation process, and by providing a catalyst and a micro bubble generator for oxidation reaction at the bottom of the heart-cleaning line, the drilling depth is about 1,000m to 300m The purpose is to reduce the construction cost by making the same wastewater treatment effect even if it is reduced, and to make the construction work easier.

In order to achieve the above object, the present invention provides a deep catalytic wet oxidation treatment apparatus in which a cardiac guide tube is buried vertically in the basement. And a guide pipe spaced at a certain height from each other; A lower portion of the cardiac guide tube is provided with a catalyst for oxidation reaction with wastewater; The upper portion of the catalyst unit is characterized in that the bubble generator for generating a micro bubble.

The deep wet oxidation treatment apparatus of the present invention can reduce the excavation depth for the installation of the cardiac guide tube to obtain a high pressure by simultaneously applying the cardiac method and the catalyst method to reduce the construction period and cost for the facility construction Effect.

In addition, it is possible to improve the waste oxidation reaction efficiency of the oxidant through the micro-bubble generation and to control the backflow of the oxidant bubbles.

1 is a schematic diagram of a cardiac arrester according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line AA of FIG. 1. FIG.
Figure 3 is a schematic diagram of a mental facility according to another embodiment of the present invention.
4 is an enlarged view of a portion B of FIG. 3;

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

First, looking at the configuration of the cardiac catalytic wet oxidation treatment apparatus according to an embodiment of the present invention through Figs. 1 and 2, in the center of the cardiac guide tube 10 that is buried vertically underground, the stirring / mixing tank The guide pipe 11 for guiding the wastewater forcedly introduced by the pump (not shown) is installed to be spaced apart from the bottom by a predetermined height, and the lower part of the cardiac guide tube 10 is oxidized and reduced during the movement of the wastewater. The catalyst unit 12 is configured to allow the reaction.

As the catalyst used in the catalyst unit 12 in this embodiment, a ceria-zirconia solid solution is used as a carrier, and it is preferable to use a monolith catalyst having a honeycomb form to maximize the contact area with the wastewater.

In addition, a gas injection line 14 for injecting a gas such as oxygen is formed in the guide pipe 11, and finer micro bubbles are generated at the lower end of the gas injection line 14 to generate a fine bubble from the catalyst part 12. Bubble generator 13 is configured to maximize the oxidation reaction efficiency.

The upper part of the cardiac guide tube 10 is provided with an outlet for outflow of the fluid which has been purged by wet oxidation, and the outlet is connected to a gas / liquid separation facility.

The effects of the operation of the device of the present invention constituting such a configuration will be described.

First, in the stirring / mixing tank, stirring is performed in a state in which hazardous waste such as waste water is mixed with supply water, and then moved into the cardiac guide tube 10 through the guide pipe 11 by a pump operation. You lose.

The wastewater moved to the lower portion of the cardiac guide tube 10 through the guide pipe 11 is purged by an oxidation reaction in the process of passing through the catalyst unit 12, and then guided by the cardiac guide tube 10 again. After receiving the ascending will be discharged through the outlet.

In particular, the oxidation reaction is further maximized by the microbubbles generated through the bubble generator 13 in the course of the catalyst unit 12, thereby improving wastewater treatment efficiency.

In addition, after the gas / liquid separation is performed in the gas / liquid separation facility, the purified fluid discharged through the outlet is moved to the gas treatment facility, and the liquid is supplied to the recirculating water through the settling tank.

Therefore, the present invention, it can be seen that the target wet oxidation effect can be achieved even if performed only about 300m compared to the conventional deep wet oxidation technology that required a drilling depth up to 1,000m for the construction of the facility.

On the other hand, Figures 3 and 4 shows the structure of the heart catalyst wet oxidation treatment apparatus according to another embodiment of the present invention.

That is, as shown, the lower portion of the cardiac guide tube 10 is configured such that a positive temperature coefficient (PTC) thermoelectric element 15, which is a thermoelectric element for heating the wastewater, is configured to receive power from a power supply (not shown). The heat exchanger 16 is configured on one side to allow heat energy to be exchanged between the wastewater flowing downward through the guide pipe 11 and the wastewater flowing upward after the purification process is performed by a catalytic reaction at the bottom. On the inner wall surface of the discharge pipe 10, a nano silver coating layer 10a was formed to perform antibacterial and deodorizing function.

In particular, the heat exchange part 16 is provided with a plurality of metal fins protruding in a horizontal direction connecting the cardiac guide tube 10 and the wastewater guide pipe 11 to each other so that heat is primarily transmitted to the wastewater introduced. It is preferable to.

When the configuration according to the other embodiment as described above, it is possible to maintain the high temperature of the waste water by the PTC thermoelectric element 15 to further improve the reactivity with the catalyst unit 12 to maximize the purification effect The waste water discharged after being heated by the PTC thermoelectric element 15 is heat-exchanged with the high temperature wastewater introduced through the guide pipe 11 by the heat exchanger unit 16 in the form of a metal fin. Preheating effect can be achieved.

In addition, it can be seen that the purified wastewater discharged after the purification treatment can reduce the occurrence of odor of the facility by the antimicrobial and deodorizing action according to the contact of the nanosilver coating layer 10a.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the heart catalyst wet oxidation device of the present invention may be variously modified and implemented by those skilled in the art.

However, such modified embodiments should not be understood individually from the spirit or scope of the present invention, such modified embodiments will be included within the appended claims of the present invention.

10: sentiment guide 11: guide pipe
12 catalyst unit 13 bubble generator
14 gas injection line 15 PTC thermoelectric element
16: heat exchanger

Claims (6)

In the deep catalytic wet oxidation apparatus in which the cardiac guide tube 10 is buried at a predetermined depth vertically in the basement,
The inside of the cardiac guide tube 10 is provided with a guide pipe 11 having a lower end spaced at a predetermined height from a bottom surface to form a flow path for guiding the inflow and outflow of waste water;
A catalyst unit 12 for oxidizing reaction with wastewater is installed below the cardiac guide tube 10;
Deep catalyst wet oxidation apparatus, characterized in that the bubble generator (13) for generating a fine bubble is mounted on the catalyst portion (12). The method according to claim 1,
The bubble generator 13 is a deep catalytic wet oxidation apparatus, characterized in that provided in the lower end of the gas injection line 14, the oxygen gas is injected. The method according to claim 1,
The deep catalytic wet oxidation apparatus, characterized in that the heat exchanger 16 for heat exchange between the incoming wastewater and the outgoing wastewater is formed in the upper portion of the cardiac guide tube 10.
The method according to claim 3,
The heat exchange unit 16 is a deep catalytic wet oxidation apparatus, characterized in that a plurality of metal fins protruding in the form of connecting the cardiac guide pipe 10 and the wastewater guide pipe 11 mutually in the horizontal direction. The method according to any one of claims 1 to 4,
Deep catalytic wet oxidation apparatus, characterized in that the lower portion of the cardiac guide tube (10) is a PTC thermoelectric element (15) that is a heating element for the temperature rise of the wastewater. The method according to any one of claims 1 to 4,
The deep catalytic wet oxidation apparatus, characterized in that the nano-silver coating layer (10a) is formed on the discharge side of the cardiac guide tube (10).

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