KR100902632B1 - Wast water treatment apparatus and wast water treatment method using there - Google Patents

Abstract

A wastewater treatment apparatus for simplifying wastewater treatment processes and a wastewater treatment method using the same are provided to reduce processing time and the processing cost remarkably and to improve process efficiency of wastewater. A wastewater treatment apparatus includes a solid-liquid separator(10), a waste water reservoir(20), a reactor(30), a catalyst feed port(40), an ozone supply part(50), a pressure controller(60), a temperature controller(70), a agitating unit(80), a discharging control unit(90), a gas-liquid separator(100), an ozone crusher(110), a temporary reservoir(120), a coagulant feed port(130) and a vacuum evaporator(140). An inlet port(11) is formed on one side of the solid-liquid separator and a wastewater outlet(12) and a sludge outlet(13) are formed on the other side of the solid-liquid separator. The catalyst feed port includes a catalyst storage(41), a first sending unit(42), and a first flow meter(43). The ozone supply part includes an ozone generating part(51), a second sending unit(52) and a second flow meter(53). The pressure controller includes a first pressure control part(61) and a second pressure control part(62). The coagulant feed port includes a coagulant storage(131) and a feeding unit(132).

Description

Waste water treatment apparatus and waste water treatment method using the same {Wast water treatment apparatus and Wast water treatment method using there}

The present invention relates to a wastewater treatment apparatus and a wastewater treatment method using the same, wherein ozone is pumped into a reactor and converted into a supercritical state, and the converted supercritical ozone is mixed with the wastewater in the reactor through an agitator and mixed with the wastewater. By oxidizing the mixture contained in the waste water, it is decomposed into low molecular weight materials, and by mineralizing the decomposed material into carbon dioxide and water again, the wastewater treatment process is simplified and the wastewater treatment time is significantly shortened while maintaining the discharge condition below the waste water environmental standard. The present invention relates to a wastewater treatment apparatus and a wastewater treatment method using the same, which can significantly improve the treatment efficiency of wastewater by increasing the reaction time and the reaction area of ozone and wastewater.

In general, before wastewater waste such as livestock waste generated in homes or restaurants, wastewater generated in factories and industrial sites, and livestock waste generated in ranches, etc. are discharged to the stream, Discharge.

At this time, as a method of treating the wastewater waste, the wastewater is separated into wastewater and sludge into solid-liquid sludge, and sludge is separately managed.The wastewater is separated into sludge and wastewater after the biological and physicochemical processes. do.

In recent years, the technology using ozone has been expanded as part of a physicochemical treatment method for treating wastewater.

Dissolved Ozone Flotation is mainly used as ozone application method, and sewage treatment plant screen-1st settler-2nd settler-Rapid mixing tank-Slow mixing tank-Dissolved ozone reactor and floating tank-Treatment tank-Discharge As described above, the wastewater treatment process is composed of a slow mixing tank and a treatment tank.

Here, the operation principle of the dissolved ozone flotation method is to take a part of the already treated water into the pressurized container, and when the pressure is applied to 4 ~ 7 atm, ozone is dissolved in water in the pressure vessel. It is a method of mixing and processing. At this time, a lot of ozone is dissolved in the waste water. When the ozone is mixed with the waste water and exposed to atmospheric pressure (1 atm), the ozone dissolved in pressurization to 4 to 7 atm is largely micro bubbles (10 to 120 µm). It will be deposited. As a result of the precipitation of countless micro-bubbles, the waste water is reacted with the waste water to be treated.

The following table is a table showing the oxidation state of the mixture contained in the waste water for 20 hours using the dissolved ozone flotation method.

As shown in the above table, the conventional wastewater treatment apparatus using ozone does not react with the wastewater between each bubble because the pattern of floating bubbles is constant, so that the polymer material (organic, inorganic, suspended matter, color, turbidity) contained in the wastewater , Bacteria, TP, TN, etc.) there was a problem that the oxidation efficiency is reduced.

In addition, the use of ozone in large quantities to improve the oxidation efficiency of the mixture contained in the ozone and waste water has a problem that the waste water treatment costs significantly increased.

The present invention has been made to solve the above problems, the object of the present invention, according to the present invention as described above, ozone is pumped into the reactor to convert to a supercritical state, the converted supercritical ozone is stirred It is mixed with the waste water in the reactor through the unit to oxidize the waste water and the mixture contained in the waste water to decompose it into low molecular weight materials, and by igniting the decomposed material back into carbon dioxide and water, etc. The present invention provides a wastewater treatment apparatus and a wastewater treatment method using the same, which can shorten and increase the reaction time and the reaction area of ozone and wastewater.

In addition, by agitating the supercritical ozone with waste water through the agitator in the reactor, it is possible to improve the treatment efficiency of waste water even with a small amount of ozone and to significantly reduce the treatment cost of waste water according to the purchase cost of ozone. The present invention provides a wastewater treatment apparatus and a wastewater treatment method using the same.

According to an aspect of the present invention for achieving the above object, in the wastewater treatment apparatus for separating and purifying the wastewater so that the wastewater can be discharged below the environmental standard value, a reactor into which wastewater is introduced from the outside, and the reactor and An ozone supply unit connected to supply ozone to the reactor, pressure control means for adjusting the pressure inside the reactor such that ozone inside the reactor is in a supercritical state, and installed at one side of the inside of the reactor, It provides a waste water treatment apparatus comprising a discharge control means for regulating the discharge of the product generated by the ozone and the waste water react with each other.

And, it is preferable to further include a catalyst supply unit is connected to the waste water flowing into the reactor to supply a catalyst to the waste water.

The apparatus may further include a stirring unit installed inside the reactor to stir the ozone, the catalyst and the waste water to promote the reaction of the ozone with the catalyst and the waste water.

In addition, it is preferable to further include a gas-liquid separator which is installed at the rear end of the discharge control means in the inside of the reactor and separates the product material discharged from the reactor into a gas component and a liquid component and discharges them to the outside, respectively.

The apparatus may further include an ozone crusher installed on the discharge path of the gas component discharged from the gas-liquid separator to crush ozone contained in the gas component.

In addition, the liquid component is installed on the discharge path of the liquid component discharged from the gas-liquid separator and the coagulant supply unit for supplying a coagulant to the liquid component and the liquid component installed in the rear end of the coagulant supply unit of the discharge path of the liquid component supplied with the coagulant Temporary storage tank for storing the, preferably further comprises a reduced pressure distillation unit for distilling only water using reduced pressure distillation of the liquid components stored in the temporary storage tank.

The apparatus may further include temperature control means for controlling the internal temperature of the reactor so that the ozone is in a supercritical state by heating the reactor.

On the other hand, in the wastewater treatment method for separating and purifying the wastewater in order to discharge the wastewater to the outside, the catalyst and ozone is supplied to the wastewater flowing into the reactor, and the pressure inside the reactor so that the supplied ozone becomes a supercritical state And controlling the temperature and decomposing and mineralizing the mixture contained in the waste water into low molecules so that the waste water is discharged to the outside under discharge conditions of less than an environmental standard value.

In addition, it is preferable to add a catalyst so as to accelerate the oxidation and mineralization of the mixture contained in the waste water by the administration of ozone to the mixture of the discharge conditions.

According to the present invention as described above, the ozone is transported into the reactor and converted into a supercritical state, and the converted supercritical ozone is mixed with the waste water in the reactor through an agitator to oxidize the waste water and the mixture contained in the waste water. By decomposing into low-molecular substances and mineralizing the decomposed substances into carbon dioxide and water, etc., the wastewater treatment process is simplified while maintaining the discharge condition below the wastewater environmental standard value, and the treatment time of wastewater is significantly shortened, and the reaction time of ozone and wastewater. And by increasing the reaction area there is an effect that can significantly improve the treatment efficiency of waste water.

In addition, by stirring ozone in the supercritical state with waste water through a stirring part inside the reactor, even with a small amount of ozone, the wastewater can be improved and the treatment cost of waste water can be significantly reduced according to the purchase cost of ozone. It works.

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

1 is a view schematically showing a wastewater treatment apparatus according to an embodiment of the present invention.

1, the wastewater treatment apparatus 1 according to the embodiment of the present invention includes a solid-liquid separator 10, a wastewater storage tank 20, a reactor 30, a catalyst supply unit 40, and an ozone supply unit. (50), pressure adjusting means (60), temperature adjusting means (70), stirring portion (80), discharge control means (90), gas-liquid separator (100), ozone crusher (110), It comprises a temporary storage tank 120, a flocculant supply unit 130 and a reduced pressure distillation unit 140.

 The solid-liquid separator 10 is formed with an inlet 11 through which wastewater waste is introduced from the outside on one side, and a wastewater outlet 12 and a sludge discharge port 13 are formed on the other side, separating the introduced wastewater waste into wastewater and sludge. After each serves to discharge through the waste water discharge port 12 and the sludge discharge port (13).

The solid-liquid separator 10 is known enough to be purchased and used commercially available to those having ordinary skill in the art, such as a centrifugal separator, and the specific method of separating waste wastes will be omitted.

In addition, the solid-liquid separator 10 preferably installs a pump (P) on the inflow path of the wastewater waste from which the wastewater flows from the outside to forcibly introduce the wastewater into the wastewater.

The wastewater storage tank 20 is formed in a substantially cylindrical shape and is connected to the wastewater outlet 12 of the solid-liquid separator 10 so that the wastewater flows from the solid-liquid separator 10 through the wastewater outlet 12 and discharges a certain amount of wastewater. .

Reactor 30 is formed in a substantially cylindrical shape, one side is connected to the waste water storage tank 20 is a constant amount of waste water is continuously introduced, the stirring unit 80 and discharge control means 90 and gas-liquid separator (to be described later inside) 100) is installed. The reactor 30 serves to provide a reaction space so that the supercritical state ozone supplied from the ozone supply unit 50 to be described later is mixed with the introduced wastewater and oxidized.

The catalyst supply unit 40 is connected to the waste water storage tank 20 and is installed next to the catalyst storage unit 41 and the waste water storage tank 20 to store the catalyst therein, and the waste water supplied with the catalyst from the waste water storage tank 20 is reactor. It is installed at the rear end of the first conveying means 42 of the first conveying means 42 and the waste water storage tank 20 and the waste water movement path between the reactor 30 to be conveyed to the reactor 30 It comprises a first flow meter 43 for measuring the flow rate of waste water, serves to supply a catalyst to the waste water stored in the waste water storage tank 20 and to feed the waste water supplied with the catalyst into the reactor.

At this time, hydrogen peroxide (H ₂ O ₂ ), oxygen (O ₂ ), etc. may be used as the catalyst, and in one embodiment of the present invention will be described as hydrogen peroxide for convenience of description.

The ozone supply unit 50 is connected to the reactor 30 and generates ozone, and is disposed between the ozone generating unit 51 and the reactor 30 and ozone generated from the ozone generating unit 51. To the reactor 30 is installed at the rear end of the second conveying means 52 of the second conveying means 52 and the ozone movement path between the ozone generator 51 and the reactor 30 and the reactor 30 It is configured to include a second flow meter (53) for measuring the amount of ozone that is pumped to), and serves to supply ozone into the reactor (30).

The pressure regulating means 60 includes a first pressure regulating part 61 installed at a rear end of the first pressure feeding means 42 of the movement path of the waste water moving from the waste water storage tank 20 to the reactor 30, and the second pressure feeding. And a second pressure regulating portion 62 provided between the means 52 and the second flow meter 53.

The pressure regulating means 60 controls the pressure of the waste water pumped into the reactor 30 by the first pumping means, and the pressure of ozone pumped into the reactor 30 by the second pumping means to control the supercritical condition of ozone. Adjust the internal pressure of the reactor so that.

Temperature control means 70 is installed on the outer surface of the reactor 30 serves to increase the internal temperature of the reactor 30 by heating the reactor 30 so that ozone that is pumped into the reactor 30 is in a supercritical state. do.

Here, the temperature control means 70 may be used a common heater and heater.

The stirring unit 80 is installed in the center of the reactor 30, and the ozone which is in a supercritical state by the pressure adjusting means 60 and the temperature adjusting means 70 and the waste water including hydrogen peroxide are stirred and included in the waste water. The mixture (organic, inorganic, suspended matter, chromaticity, turbidity, bacteria, TP, TN, etc.) to the low molecular weight to promote oxidation and mineralization.

Discharge control means 90 is installed on one side of the reactor 30 outside the product of the waste water stored in the initial reactor 30 (components generated by the oxidation and low differentiation of liquid and waste water mixed with ozone, hydrogen peroxide and waste water) Blocking the discharge path of the discharged product material, and if the internal pressure of the reactor 30 exceeds the preset pressure to open the discharge path of the product material serves to discharge the product material in excess. As a discharge control means 90, a back pressure regulator may be used.

The gas-liquid separator 100 is installed at the rear end of the discharge control means 90 to not only reduce the speed of the product discharged from the reactor 30 at high pressure, but also separate the gas and liquid components contained in the product after separation. It serves to discharge the gas and liquid components respectively.

Such a gas-liquid separator 100 is well known enough to be purchased and used commercially available to those having ordinary skill in the art, and specific gas and liquid separation methods are omitted. .

The ozone crusher 110 is installed on the discharge path of the gas component discharged from the gas-liquid separator 100 to crush a small amount of ozone contained in the gas component.

Temporary storage tank 120 is connected to the gas-liquid separator 100, the liquid component discharged from the gas-liquid separator 100 is introduced, and serves to temporarily store the introduced liquid component.

The coagulant supply unit 130 includes a coagulant storage unit 131 in which a coagulant supplied from the outside is stored, and supply means 132 for supplying the coagulant stored in the coagulant storage unit to the liquid component discharged from the gas-liquid separator 100. It is configured to supply a coagulant to the liquid component and serves to coagulate and solidify only a specific substance such as a small amount of ammonia contained in the liquid component.

As coagulant, calcined lime (CaOH ₂ ) may be used.

The reduced pressure distillation unit 140 is connected to the temporary storage tank 120 serves to separate and discharge only the pure water in the waste water after treatment.

At this time, the sludge remaining in the decompression device can be used as a high concentration liquid fertilizer.

Figure 2 is a flow chart showing the operation of the wastewater treatment apparatus according to an embodiment of the present invention.

The operation description of the wastewater treatment apparatus 1 according to the embodiment of the present invention configured as described above will be described with reference to FIG. 2.

First, as shown in FIG. 2, wastewater waste is supplied to the solid-liquid separator 10 from the outside, and the wastewater is separated into the wastewater and sludge in the solid-liquid separator 10, and then the sludge is discharged to the outside and the wastewater is a wastewater storage tank 20. Is discharged to (S10).

Next, the wastewater introduced into the wastewater storage tank 20 is pumped into the reactor 30 by the first pressurizing means. Here, the hydrogen peroxide stored in the catalyst storage unit 40 is supplied to the waste water stored in the waste water storage tank 20 is introduced into the reactor 30 together with the waste water (S20) ozone generated from the ozone generator 51 2 is conveyed into the reactor 30 by the pressure-reducing means 52. (S30) At this time, the supply pressure of the waste water and ozone including hydrogen peroxide is the first and second pressure regulating means so that the internal pressure of the reactor 30 is 55 or more At 60), the supply pressure of the waste water and ozone is adjusted, and the temperature control means 70 heats the reactor 30 so that the internal temperature of the reactor 30 is -12 ° C or more.

As such, the reason why the internal temperature of the reactor 30 is maintained at -12 ° C. or higher and the internal pressure of the reactor 30 at 55 atm or higher is to change only the ozone introduced into the reactor 30 into the supercritical state. .

Supercritical fluid (SCF) is defined as a substance in conditions of critical pressure and above a critical temperature, and is in a non-liquid or non-gas intermediate state, that is, liquidity and diffusion of gas. And active state.

Then, the supercritical ozone and hydrogen peroxide containing wastewater introduced into the reactor 30 are stirred by the stirring unit 80, and the mixture of ozone is contained in the wastewater while the ozone is reacted with the wastewater containing the catalyst and the organic matter (organic matter). , Minerals, suspended solids, chromaticity, turbidity, viruses, TP, TN, etc.) to oxidize to a low molecular weight (S40).

Here, the ozone reacts with the waste water, which is divided into a direct path through which the ozone molecules react directly with the mixture in the waste water and an indirect path through the indirect reaction using OH radical species formed when ozone splits the water. In particular, when hydrogen peroxide is used as a catalyst, OH radicals are reacted with one hydrogen peroxide and two ozone molecules to generate two OH radicals through the following reaction formula to promote mixture oxidation.

_{H 2 O 2 + H 2 O} → HO 2 - + H 3 O +

_{O 3 + HO 2 - → OH} + O 2 - + O 2

_{^{O 2 - + H + → HO}} 2

^{_{O 3 + O 2 - → O}} 3 - + O 2

_{^{O 3 - + H + → HO}} 3

HO3 → HO + O ₂

∴ H ₂ O ₂   + 2O ₃   → 2HO + 3O ₂

The OH radicals thus produced are reacted with the mixture to lower their molecular weight. For example, if it reacts with bicarbonate or carbonate

^{_{OH + HCO 3 - → H 2}} O + CO 2

It reacts with and becomes inorganic.

Here, OH radicals (OH radicals) are involved in the oxidation, sterilization, and disinfection of pollutants, and are natural substances that are harmless to the human body while exhibiting the most powerful effect that can be chemically decomposed and removed.

The table below shows experimental data for 10 minutes in accordance with one embodiment of the present invention.

As shown in the above table, when the reaction was performed for 10 minutes after administration of 60 ppm of ozone, it can be seen that all the polymer materials except nitrogen are oxidized. This proves that the reaction time of the waste water and ozone is significantly shorter than before, and the oxidation efficiency is remarkably improved.

Thereafter, the amount of generated material is increased by oxidizing the waste water into low molecules, and the internal pressure of the reactor 30 is increased as a certain amount of waste water and ozone are injected, so that the internal pressure of the reactor 30 exceeds the predetermined pressure In the means 90, the mixed solution first reacted inside the reactor 30 is discharged at a high pressure.

At this time, the gas-liquid separator 100 located at the rear end of the discharge control means stops the speed of the product discharged from the discharge control means 90, and separates the gas component and the liquid component from each component of the discharged mixed liquid according to its characteristics. Discharge (S60)

Thus, the gas component discharged from the gas-liquid separator 100 passes through the ozone crusher 110, and a small amount of ozone is crushed by the ozone crusher 110 to be discharged to the outside (S70).

Then, the liquid component discharged from the gas-liquid separator 100 is introduced into the temporary storage tank 120 together with the coagulant supplied from the coagulant supply unit 130, and temporarily stored in the temporary storage tank 120 and the specific component in the liquid by the coagulant Reaction solidifies and precipitates. (S80)

At this time, the pressure distillation unit 140 separates the liquid and trace sludge, and extracts only the pure liquid component to be discharged.

Meanwhile, as described above, the remaining sludge may be discharged as a liquid fertilizer having a high concentration.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

1 is a view schematically showing a wastewater treatment apparatus according to an embodiment of the present invention;

Figure 2 is a flow chart showing the operation of the wastewater treatment apparatus according to an embodiment of the present invention.

<Description of main drawing code>

1: Wastewater treatment device 10: Solid-liquid separator

20: waste water storage tank 30: reactor

40: catalyst supply unit 50: ozone supply unit

60: pressure regulating means 70: temperature regulating means

80: stirring section 90: discharge control means

100: gas-liquid separator 110: ozone crusher

120: temporary storage 130: flocculant supply unit

140: vacuum distillation unit

Claims (9)

In the wastewater treatment apparatus for separating and purifying the wastewater to be discharged to the outside, A reactor into which waste water is introduced from the outside; An ozone supply unit connected to the reactor to supply ozone into the reactor; A catalyst supply unit connected to the reactor and supplying a catalyst to the wastewater introduced into the reactor; Pressure regulating means for adjusting a pressure in the reactor such that ozone in the reactor is in a supercritical state; And Installed on one side of the reactor, including the discharge control means for regulating the discharge of the product generated by the reaction of the ozone and the waste water in the reactor, The ozone introduced into the reactor from the ozone supply unit reacts with the catalyst supplied to the waste water to generate hydroxyl groups (OH radicals), and the hydroxyl groups (OH radicals) reduce the differentiation and mineralization of the mixture contained in the waste water. Waste water treatment device characterized in that. delete The method of claim 1, Installed in the reactor, the waste water treatment apparatus further comprises a stirring portion for stirring the ozone and the catalyst and the waste water to promote the reaction of the ozone and the catalyst and the waste water. The method of claim 1, Installed in the rear end of the discharge control means of the inside of the reactor, and further comprises a gas-liquid separator for separating the product material discharged from the reactor into a gas component and a liquid component to discharge to the outside, respectively . The method of claim 4, wherein And an ozone crusher installed on the discharge path of the gas component discharged from the gas-liquid separator to crush ozone contained in the gas component. The method of claim 4, wherein A coagulant supply unit installed on the discharge path of the liquid component discharged from the gas-liquid separator to supply a coagulant to the liquid component; A temporary storage tank installed at a rear end of the flocculant supply unit in the discharge path of the liquid component to store the liquid component supplied with the flocculant; And Waste water treatment apparatus further comprises a reduced pressure distillation unit for removing only water using a reduced pressure distillation method of the liquid components stored in the temporary storage tank. The method of claim 1, And a temperature control means for controlling the internal temperature of the reactor to heat the reactor so that the ozone is in a supercritical state. In the wastewater treatment method for separating and purifying the wastewater in order to discharge the wastewater to the outside, The catalyst and ozone are supplied to the wastewater introduced into the reactor, and the pressure and temperature inside the reactor are adjusted to make the supplied ozone supercritical, and the supercritical ozone reacts with the catalyst supplied to the wastewater. Generating a hydroxyl group (OH radical), and the hydroxyl group (OH radical) lowers and mineralizes the mixture contained in the waste water to discharge the waste water to the outside. delete

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