KR101272875B1 - Zero discharge wastewater treatment method and system - Google Patents

Zero discharge wastewater treatment method and system Download PDF

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Publication number
KR101272875B1
KR101272875B1 KR1020110053441A KR20110053441A KR101272875B1 KR 101272875 B1 KR101272875 B1 KR 101272875B1 KR 1020110053441 A KR1020110053441 A KR 1020110053441A KR 20110053441 A KR20110053441 A KR 20110053441A KR 101272875 B1 KR101272875 B1 KR 101272875B1
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South Korea
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wastewater
combustion furnace
waste heat
waste water
torch
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KR1020110053441A
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Korean (ko)
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KR20120134510A (en
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현장수
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주식회사 이앤이
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/12—Heat utilisation in combustion or incineration of waste

Abstract

The present invention relates to a non-discharge wastewater treatment method and a wastewater treatment system, wherein the wastewater of the wastewater tank 40 is sprayed into the combustion furnace 10 in which the torch 17, 18, 23, 24 and the reactant 19 are installed. Wastewater inflow stage (S1) and the wastewater that burns and incinerates the wastewater passing through the combustion furnace (10) while simultaneously heating the reactant (19) with the flames of the torch (17, 18, 23, 24). Incineration step (S2), waste heat recycling step (S3) for using the waste heat generated in the wastewater incineration step (S2) for the wastewater heating of the wastewater tank (40), and generated during the wastewater heating of the wastewater tank 40 And a steam inflow step (S4) of introducing the steam into the combustion furnace 10 as the heated wastewater.
The present invention is a stable treatment of the waste water and can be recycled by recovering the energy generated during incineration wastewater heating and electricity, etc. has the advantage of maximizing energy efficiency and preventing environmental pollution.

Description

Zero discharge wastewater treatment method and system

The present invention relates to a non-discharge wastewater treatment method and a wastewater treatment system, and more particularly, to a non-discharge wastewater treatment method and a wastewater treatment system capable of maximizing energy efficiency and preventing environmental pollution.

Industrial wastewater and various wastewaters contain various pollutants, and the amount of pollutants contained in the wastewater is increasing due to industrial development.

Most domestic wastewater treatment methods are limited to wastewater treatment using microorganisms, and wastewater treatment methods using microorganisms are difficult to disintegrate hardly decomposable substances in a short time, and microorganisms decompose hardly decomposable substances in multiple stages through complex metabolic pathways. Therefore, a long time is required for wastewater treatment.

In addition, the wastewater treatment method using a microorganism has a problem in that a large amount of sludge is generated as a by-product, so a large cost is required for the sludge treatment.

It is an object of the present invention to provide a non-discharge wastewater treatment method and a wastewater treatment system for treating wastewater by incineration to maximize energy efficiency, prevent environmental pollution, enable stable treatment of wastewater, and enable discharge of wastewater.

According to a feature of the present invention for achieving the above object, the present invention is a wastewater inflow step of introducing the wastewater of the wastewater tank into the combustion furnace equipped with the torch and the reactant, and the reactant with the flame of the torch Wastewater incineration step of burning and incineration of wastewater passing through the combustion furnace at the same time as heating the wastewater, waste heat recycling step of using waste heat generated in the wastewater incineration step for wastewater heating of the wastewater tank, and wastewater heating of the wastewater tank And a steam inflow step of introducing steam generated by the combustion furnace.

The combustion furnace includes a first combustion furnace and a secondary combustion furnace having a wider cross-sectional area than the first combustion furnace, and the wastewater incineration step includes the area of contact between the flame and the wastewater by the reactants in the first combustion furnace. A first incineration step of increasing the combustion efficiency and a second incineration step of increasing the residence time of the waste water in the combustion furnace in the second combustion furnace and increasing the combustion efficiency.

The torch is mixed with brown gas and fossil fuel and used as fuel for flame.

In the waste heat recycling step, the waste heat generated in the waste water incineration step is used to generate electricity for the production of the brown gas, and then used for heating the waste water in the waste water tank.

The excess waste heat remaining in the waste heat recycling step is discharged through the stack.

A first combustion furnace having a wastewater inlet on one side and a torch for injecting a flame into the wastewater and a reactant heated by the flame of the torch on a path through which the wastewater introduced by the liquid injection from the wastewater inlet passes; A second combustion furnace communicating with a first combustion furnace and having a torch for injecting flame into the wastewater on a path through which the wastewater introduced from the first combustion passage passes; and connected to an outlet of the second combustion furnace; Waste heat recovery unit for recovering waste heat generated in the first combustion furnace and the second combustion furnace, and waste heat connected to the waste heat recovery unit and installed in the form of a coil on the outer surface or the inner surface of the waste water tank in which the waste water is stored to heat the waste water. Includes a pipeline.

The second combustion furnace has a larger cross-sectional area than the first combustion furnace.

The waste heat recovery unit is connected to a steam turbine for electricity production, the steam turbine is connected to the waste heat transfer pipe via a connecting pipe.

The waste water tank is provided with a waste water outlet and a steam outlet on one side, the waste water outlet and the steam outlet is connected via the combustion furnace, waste water transfer pipe and steam transfer pipe.

The torch is mixed with brown gas and fossil fuel and used as fuel for flame.

In the present invention, incineration is instantaneously combusted by the flame of the reactant and the torch heated in the course of passing the waste water through the combustion furnace. In addition, the flame of the torch uses a mixture of brown gas and fossil fuel, so the flame temperature is high and the flame length is long.

Therefore, the combustion efficiency of the wastewater is high, complete combustion is possible, and it is also possible to remove the hardly decomposable substances contained in the wastewater, so that the wastewater can be treated stably and the wastewater can be discharged freely.

In addition, the present invention utilizes waste heat (energy) generated in the combustion process of wastewater for the production of electricity for heating the wastewater to be introduced into the combustion furnace or to produce Brown gas.

Therefore, it is possible to increase the treatment efficiency of wastewater and to solve the electric energy for brown gas production by self-generation, thereby reducing the energy cost for producing brown gas.

In addition, the present invention is a liquid injection type and treats the waste water with the flame of the torch, so that the treatment speed of the waste water is fast and unlike the gas injection type, no additional equipment for waste water gasification is required. Therefore, it is possible to quickly treat the waste water, as well as the simple configuration has the effect of easy maintenance.

As described above, the present invention is capable of stable treatment of wastewater and recovers and utilizes energy generated during incineration as wastewater heating and electricity production, thereby maximizing energy efficiency and preventing environmental pollution.

1 is a block diagram showing a preferred embodiment of the wastewater treatment system according to the present invention.
Figure 2 is a schematic view showing a preferred embodiment of the wastewater treatment system according to the present invention.
Figure 3 is a cross-sectional view showing the internal structure of the first combustion furnace in the embodiment of the present invention.
Figure 4 is a view comparing the length of the flame according to the type of fuel supplied to the torch.
5 is a perspective view showing a waste water tank in an embodiment of the present invention.
6 is a schematic view showing another embodiment of a wastewater treatment system according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail.

The non-discharge wastewater treatment method of the present invention incinerates and treats wastewater by instant combustion, and utilizes waste heat generated during the incineration of wastewater for wastewater heating or electricity production.

As shown in FIG. 1, the non-discharge wastewater treatment method includes a wastewater inflow step S1, a wastewater incineration step S2, a waste heat recycling step S3, and a steam inflow step S4.

In the wastewater inflow step S1, the wastewater m of the wastewater tank 40 is introduced into the combustion furnace 10 in which the torch 17, 18, 23, 24 and the reactant 19 are installed by liquid injection. Liquid injection inflows increase the surface area of the wastewater and thus increase the combustion efficiency. In addition, the liquid injection method does not require additional equipment compared to the gas injection method, and the wastewater can be quickly treated because of the fast moving speed of the waste water.

The wastewater incineration step S2 heats the reactant 19 with the flames of the torch 17 and 18 and simultaneously burns and wastes the wastewater m passing through the combustion furnace 10.

Waste water incineration step (S2) is the primary incineration step to increase the combustion efficiency by increasing the contact time of the flame (17a, 18a, 23a, 24a) and the waste water (m), and the residence time in the combustion furnace 10 of the waste water (m) To increase the combustion efficiency of the wastewater;

In the first incineration step, the flame length of the torch 17 and the reactant 19 increase the contact time of the waste water (m) and the flame required for combustion, and increase the flame temperature to increase the combustion efficiency of the waste water. The secondary incineration step increases the combustion efficiency by increasing the residence time of the wastewater combustion furnace 10 by widening the pipeline of the combustion furnace 10 compared with the primary incineration step.

Wastewater incineration step (S2) removes not only wastewater but also hardly decomposable substances such as dioxins and heavy metals contained in the wastewater. Refractory substances such as dioxins and heavy metals are destroyed and removed by high heat.

Torch (17, 18, 23, 24) uses a mixture of brown gas (BG, fossil fuel) as the fuel of the flame. Brown gas increases the flame temperature, increasing the combustion efficiency of the wastewater, and when mixed with fossil fuel, the flame length becomes longer. Long flames increase the combustion time by increasing the contact time between the waste water and the flame.

Brown gas is a mixed gas in which hydrogen and oxygen are mixed at a ratio of 2: 1 in the ratio of water, and is produced by dissociation of water by electrolysis technology. Brown's gas is an ideal mixed gas that is completely burned by its own oxygen and exhibits unique combustion characteristics.

These brown gases are characterized by high heat with better combustion conditions than any fuel that must supply air from the outside when in contact with the reactants. This high temperature pyrolyzes the hardly decomposable substances contained in the wastewater.

Fossil fuel mixed with Brown gas may include at least one selected from heavy oil, kerosene, diesel, waste oil, LNG, LPG.

The waste heat recycling step S3 uses waste heat generated in the waste water incineration step S2 to heat the waste water m of the waste water tank 40. Wastewater heating maintains a high temperature of the wastewater (m) flowing into the combustion furnace 10 to increase the combustion efficiency of the wastewater. When the wastewater is heated using the waste heat, the wastewater is heated to about 80 to 90 ° C., and when the heated wastewater is introduced into the combustion furnace 10, the combustion efficiency of the wastewater is further improved and energy efficiency is maximized.

In addition, the waste heat recycling step (S3) is used in the wastewater heating in the wastewater tank 40 after using the waste heat generated in the wastewater incineration step for the production of electricity for the production of brown gas.

Electric energy savings are high when electricity is generated using waste heat and the generated electricity is used to produce brown gas. In addition, the combustion efficiency of the waste water is also improved when the surplus waste heat left after generating electricity is used for waste water heating.

The excess waste heat remaining in the waste heat recycling step is discharged through the stack.

In the steam inflow step S4, steam generated during wastewater heating of the wastewater tank 40 is introduced into the combustion furnace as the heated wastewater m. Inflow of steam generated during waste water heating into the combustion furnace contributes to maintaining the environment of the combustion furnace 10 at a high temperature, thereby increasing combustion efficiency.

Next, the discharge-free wastewater treatment system for the discharge-free wastewater treatment will be described.

The non-discharge wastewater treatment system includes a combustion furnace 10 for incinerating wastewater and a waste heat recovery unit 30 for recovering waste heat generated during incineration of wastewater.

Specifically, wastewater incineration is performed in the course of passing the wastewater m through the combustion furnace 10 including the first combustion furnace 11 and the second combustion furnace 21.

The first combustion furnace 11 and the second combustion furnace 21 are connected in a straight line in order to increase the combustion efficiency while simplifying the configuration, and the second combustion furnace 21 is relative to the first combustion furnace 11. Has a wide cross-sectional area. The large cross-sectional area increases the residence time of the wastewater in the second combustion furnace 21 by widening the pipeline of the second combustion furnace 21 compared to the pipeline of the first combustion furnace 11. The first combustion furnace 11 has a smaller cross-sectional area than the second combustion furnace 21 in order to increase the contact area between the wastewater and the flame.

The first combustion furnace 11 is provided with a wastewater inlet 13 at one side, and a torch 17 for injecting flames into the wastewater on a path through which the wastewater m introduced from the wastewater inlet 13 passes.

The wastewater inlet 13 is connected to the wastewater tank 40 through the wastewater transport pipe 14. In the wastewater inlet 13, an injection nozzle 15 for injecting the wastewater m of the wastewater tank 40 into the first combustion furnace 11 by the operation of the pump 45 is connected to the wastewater transport pipe 14. It is installed. The spray nozzle 15 is a nozzle capable of high pressure spraying to increase the surface area of the wastewater.

2 and 3, the torch 17 and 18 are installed in the first combustion furnace 11 in up and down pairs. Torch 17, 18 uses a mixed fuel of brown gas (BG) and fossil fuel as the fuel of the flame. The use of a mixture of brown gas and fossil fuels as the flame fuel increases the length of the flame and increases the temperature.

As shown in Figure 4, when the brown gas (BG) and fossil fuels (heavy oil, kerosene, diesel, waste oil, LNG, LPG) is used as a raw material of the torch, the flame length (c) is brown gas or fossil When the fuel is used alone, it is about 1.5 times longer than the flame length (a, b) and the temperature is high. Figure 4 shows an example of experiment using heavy oil in fossil fuel.

Long flames increase the combustion time by increasing the contact time between the waste water and the flame. That is, the flame contact time of the wastewater m passing through the first combustion furnace 11 is increased while the flames 17a and 18a of the torch 17 and 18 installed in the upper and lower pairs overlap each other.

In addition, the inclusion of the brown gas as the fuel of the torch 17, 18, 23, 24 is to increase the combustion temperature of the waste water by increasing the flame temperature. Brown gas is characterized by high heat with better combustion conditions than any fossil fuel when in contact with the reactants. High heat pyrolyses not only wastewater but also hardly decomposable substances contained in the wastewater.

When brown gas is supplied to each torch 17, 18, 23, 24, fossil fuel is mixed with brown gas. To this end, a brown gas generator 51 for producing brown gas and a combustion fuel storage tank 40 for storing fossil fuel are provided. The brown gas generator 51 receives water (H 2 O) and changes the brown gas (2H 2 + O 2 ).

Fossil fuel may include one or more selected from heavy oil, kerosene, diesel, waste oil, LNG, LPG.

The reactant 19 is installed in the first combustion furnace 11 and is installed at the position of the flames 17a and 18a of the torch 17 and 18. The reactant 19 serves to increase the combustion efficiency by widening the surface area of the wastewater m passing through the first combustion furnace 11. In the present embodiment, the reactant 19 is formed in a mesh form to increase the surface area of the wastewater m.

If the reactant 19 has a plurality of holes in the flow direction of the wastewater, such as a cylindrical pipe, a plurality of cylindrical perforated plates stacked, a plurality of plate-like sheets, and a plurality of pipes collected, Various examples can be employed.

The reactant 19 is made of a material that can withstand high temperatures, and may be made of, for example, a stainless steel (SUS 310 or higher) material, a ceramic material, or the like.

The torch 23, 24 which injects a flame toward wastewater m is provided also in the 2nd combustion furnace 21 on the path through which wastewater passes. Torch (23, 24) installed in the second combustion furnace 21 also uses a mixture of brown gas and fossil fuel to improve the combustion efficiency.

In the present embodiment, the combustion furnace 10 is divided into two sections of the first combustion furnace 11 and the second combustion furnace 21 for convenience of description, but according to the type of wastewater, the second combustion furnace 21 ) May be provided in plurality.

For example, waste water (m) is burned and incinerated by the flame of the torch installed in each combustion furnace in the course of passing through the second to fifth combustion furnaces in which the pipes are wider than the first combustion furnace and the first combustion furnace. Can be. In addition, in order to increase combustion efficiency, a plurality of reactants 19 may be installed in the combustion furnace 10.

The combustion furnace 10 is made of a material that can withstand high heat. For example, a fireproof material is built in the inside and the outside may be made of steel or stainless steel. The construction of the shell and stainless steel is to prevent waste water leakage through the refractory material.

In the process of passing through the first combustion furnace 11 and the second combustion furnace 21, the waste water is burned and incinerated, and waste heat is generated during the incineration process. The waste heat recovery unit 30 is provided at the outlet side of the second combustion furnace 21 to recover the waste heat.

The waste heat recovery unit 30 is connected to the waste heat transfer pipe 41 and the steam turbine 50, and the waste heat transfer pipe 41 is also connected to the steam turbine 50 through the connection pipe 46.

Waste heat transfer pipe 41 is a configuration for heating the waste water of the waste water tank (40). Waste heat transfer pipe 41 is installed in the form of a coil on the outer surface or the inner surface of the waste water tank 40, the waste water is stored, the end is connected to the stack (60).

The on-off valve 42 is installed at the connection portion between the waste heat transfer pipe 41 and the waste heat recovery unit 30, and the waste heat recovered from the waste heat recovery unit 30 is selectively introduced into the waste heat transfer pipe 41.

The steam turbine 50 is configured to generate electricity by receiving waste heat. The connection portion between the steam turbine 50 and the waste heat recovery unit 30 is provided with an on-off valve 47 so that the waste heat recovered from the waste heat recovery unit 30 is selectively supplied to the steam turbine 50.

In addition, the steam turbine 50 is connected to the Brown gas generator 51. The brown gas generator 51 receives the electricity produced from the steam turbine 50 to generate the brown gas.

Produces electricity through self-power generation using the steam turbine (50), supplies the produced electricity to the brown gas generator (51) to produce brown gas, by mixing the produced brown gas with fossil fuel (10) Can be supplied with each torch.

On-off valve 48 is installed in the connecting pipe 46 for connecting the steam turbine 50 and the waste heat transfer pipe 41. The open / close valve 48 installed in the connecting pipe 46 supplies waste heat generated during incineration of wastewater to the heating of the wastewater tank 40 in which the wastewater m is stored, or used for electricity production using a steam turbine 50, and then wastewater tank. Allow to be supplied to the wastewater heating of (40).

On the other hand, waste water for incineration is stored in the waste water tank (40). The waste water tank 40 has a waste heat transfer pipe 41 connected to the waste heat recovery unit 30 on an outer surface or an inner surface thereof in a coil form. In the course of passing the waste heat through the waste heat transfer pipe 41 in the form of a coil, the waste water m inside the waste water tank 40 is heated. Coil-type waste heat transfer pipe 41 takes the form of wrapping the entire wastewater tank 40 to facilitate the heating of the wastewater (m).

The waste water tank is provided with a waste water outlet (not shown) and a steam outlet (not shown) on one side, the waste water outlet and the steam outlet is connected through the combustion furnace 10, waste water transfer pipe 14 and the steam transfer pipe 43.

The first combustion furnace 11 and the wastewater tank 40 are connected to each other via the steam transfer pipe 43 so as to supply the steam generated by the wastewater heating to the first combustion furnace 11. In addition, the waste water tank 40 is connected to each other through the injection nozzle 15 and the waste water transfer pipe 14 installed at the waste water inlet to supply the waste water to the first combustion furnace (11).

The steam transport pipe 43 is connected to the first combustion furnace 11 adjacent to the wastewater inlet 13 and contributes to increasing the combustion efficiency of the wastewater.

As described above, in the wastewater treatment system 1 of the present invention, the first combustion passage 11 and the second combustion passage 21 having a wider conduit than the first combustion passage 11 are connected in a straight line, and the second combustion passage 11 is connected in a straight line. The waste heat recovery unit 30 is installed at the outlet side of the combustion furnace 21 so that the waste heat generated in the wastewater treatment process through the first combustion furnace 11 and the second combustion furnace 21 can be recovered and recycled.

The wastewater treatment system 1 having such a structure has a simple configuration and is easy to maintain and high in wastewater treatment efficiency, and maximizes energy efficiency since energy generated during incineration of wastewater is recycled to wastewater heating and electricity production.

In another embodiment, as shown in FIG. 6, the wastewater treatment system 1 may have only a wastewater heating and stack discharge function of waste heat. In this case, the production of brown gas can be achieved through external electricity supply.

Hereinafter, a process of treating wastewater through the wastewater treatment system of the present invention will be described in detail.

First, a mixed fuel of brown gas and fossil fuel is supplied to the torch 17, 18, 23, 24, and a flame is generated to heat the reactant 19 in the first combustion furnace 11 while simultaneously pumping the pump 45. By operating the wastewater of the wastewater tank 40 is introduced into the first combustion furnace (11).

Waste water (m) of the waste water tank (40) is introduced into the first combustion furnace (11) by the liquid injection method through the injection nozzle (15) installed in the wastewater inlet (13), wastewater introduced into the first combustion furnace (11) (m), while passing through the reactant 19, the surface area becomes wider and is burned instantly by incineration by the flames 17a and 18a of the reactant 19 and the torch 17,18.

Brown gas has a thermal reaction property that generates a high heat as the material to be heated is a material formed at high heat. Therefore, not only wastewater but also hardly decomposable substances such as heavy metals and dioxins contained in the wastewater are removed in a manner that is destroyed and vaporized by heat. In this process, volatile organic compounds (VOCs) and odors are also pyrolyzed and removed.

In particular, in the first combustion furnace 11, the flame lengths of the torch 17 and 18 increase the contact time of the flames 17a and 18a of the wastewater m, and the flame temperature is further increased to increase the combustion efficiency of the wastewater m. As the second combustion furnace 21 increases, the residence time of the wastewater is increased by the increased cross-sectional area, and the combustion efficiency of the wastewater by the flames 23a and 24a of the torch 23 and 24 is further increased.

Thus, the flame 17a of the high temperature reactant 19 and the torch 17, 18, 23, 24 in the course of passing the waste water m through the first combustion furnace 11 and the second combustion furnace 21. And 18a, 23a, and 24a are instantaneously burned and incinerated to remove hardly decomposable substances.

Waste heat generated during the combustion process is supplied to the waste heat transfer pipe or the steam turbine 50 through the waste heat recovery unit 30.

When the waste heat is supplied to the waste heat transfer pipe 14, the on / off valve 42 connecting the waste heat transfer pipe 14 and the waste heat recovery unit 30 is opened, and the waste heat recovery unit 30 and the steam turbine 50 are opened. Opening and closing valve 47 is connected to maintain a closed state. Then, the waste heat is moved through the waste heat transfer pipe 14 to heat the wastewater of the wastewater tank 40.

Next, in the case of supplying waste heat to the steam turbine 50, the on-off valve 42 connecting the waste heat transfer pipe 14 and the waste heat recovery unit 30 is closed and the waste heat recovery unit 30 and the steam turbine 50 are closed. Opening valve 47 for connecting and the open and close valve 48 for connecting the steam turbine 50 and the waste heat transfer pipe (14). Then, the waste heat is supplied to the steam turbine 50 and used for electricity production, and the remaining waste heat is sent to the waste heat transfer pipe 14. Waste heat sent to the waste heat transfer pipe 14 is discharged through the stack 60 after heating the waste water of the waste water tank 40.

That is, 800 ° C. waste heat from the second combustion furnace 21 may be directly used for heating the waste water tank 40, or may be used for waste water heating of the waste water tank 40 after the waste heat is used for electricity production.

The electricity produced in the steam turbine 50 is sent to the brown gas generator 51 and the brown gas generator 51 generates brown gas in real time using the provided electricity. Brown gas is supplied to each torch (17, 18, 23, 24) of the furnace (11, 21) and does not store compressed, thereby ensuring a stable operation of the wastewater treatment system.

The scope of the present invention is not limited to the embodiments described above, but may be defined by the scope of the claims, and those skilled in the art may make various modifications and alterations within the scope of the claims It is self-evident.

1: wastewater treatment system 10: furnace
11,21: first and second combustion furnace 13: wastewater inlet
14: wastewater pipe 15: spray nozzle
17, 18, 23, 24: Torch 17a, 18a, 23a, 24a: Flame
19: reactant 30: waste heat recovery
40: wastewater tank 41: waste heat transfer pipe
42: open and close valve 43: steam transfer pipe
45: pump 50: steam turbine
46: connector 47, 48: opening and closing valve
51: brown gas generator 53: combustion fuel storage tank
60: stack m: wastewater

Claims (10)

A wastewater inflow step of introducing the wastewater from the wastewater tank into a combustion furnace in which a torch and a reactant are installed;
A wastewater incineration step of burning and incinerating wastewater passing through the combustion furnace while simultaneously heating the reactant with the flame of the torch;
A waste heat recycling step of using waste heat generated in the waste water incineration step to heat waste water of the waste water tank;
And a steam inflow step of introducing steam generated by wastewater heating of the wastewater tank into the combustion furnace. The method according to claim 1,
The combustion furnace includes a first combustion furnace and a secondary combustion furnace having a wider cross-sectional area than the first combustion furnace,
The wastewater incineration step,
A first incineration step of increasing the contact area between the flame and the wastewater and increasing combustion efficiency by the reactants in the first combustion furnace;
And a second incineration step of increasing the residence time of the wastewater in the combustion furnace and increasing combustion efficiency in the second combustion furnace. The method according to claim 1,
The torch is a non-discharge wastewater treatment method characterized by using a brown gas and fossil fuel as a fuel of the flame. The method according to claim 3,
The waste heat recycling step
Wastewater treatment method characterized in that the waste heat generated in the wastewater incineration step is used for electricity production for the production of the brown gas, and then used for heating the wastewater in the wastewater tank. The method according to claim 1,
In the waste heat recycling step
Non-discharge wastewater treatment method characterized in that the excess waste heat remaining in use is discharged through the stack. A first combustion furnace having a wastewater inlet on one side and a torch for injecting a flame into the wastewater on a path through which the wastewater introduced by the liquid injection from the wastewater inlet passes and a reactant heated by the flame of the torch;
A second combustion furnace communicating with the first combustion furnace and having a torch for injecting flame into the wastewater on a path through which the wastewater introduced from the first combustion furnace passes;
A waste heat recovery unit connected to an outlet of the second combustion furnace to recover waste heat generated in the first combustion furnace and the second combustion furnace;
And a waste heat transfer pipe connected to the waste heat recovery unit and installed in a coil form on an outer surface or an inner surface of the waste water tank in which the waste water is stored, to heat the waste water. The method of claim 6,
And the second combustion furnace has a larger cross-sectional area than the first combustion furnace. The method of claim 6,
The waste heat recovery unit is connected to a steam turbine for electricity production, the steam turbine is connected to the waste heat transfer pipe via a connecting pipe, characterized in that no discharge wastewater treatment system. The method of claim 6,
The waste water tank is provided with a waste water outlet and a steam outlet on one side, the waste water outlet is connected to the first combustion furnace through a wastewater transport pipe, the steam outlet is connected to the first combustion furnace through a steam transport pipe Zero discharge wastewater treatment system. The method of claim 6,
The torch is a non-discharge wastewater treatment system, characterized in that for mixing the brown gas and fossil fuel as a fuel of the flame.
KR1020110053441A 2011-06-02 2011-06-02 Zero discharge wastewater treatment method and system KR101272875B1 (en)

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KR20150082927A (en) 2014-01-08 2015-07-16 두산중공업 주식회사 Stacked type vertical tube falling film evaporator, zero liquid discharging equipment comprising the same, and zero liquid discharging method using the same
US10449468B2 (en) 2014-01-08 2019-10-22 DOOSAN Heavy Industries Construction Co., LTD Stacked type falling film evaporator, zero liquid discharge system comprising the same, and zero liquid discharging method using the same
KR20170036499A (en) 2015-09-24 2017-04-03 김종택 Method and device for cyclic utilizing processing of designated waste

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