KR100954301B1 - Apparatus for treatment wastewater - Google Patents

Abstract

PURPOSE: A wastewater processing device is provided to save energy costs by evaporating wastewater with compressed heat of vapor and initial heating energy and by separating purified water from wastewater. CONSTITUTION: A wastewater processing device comprises the following steps: a wastewater supply part(1); an evaporation part(5) restoring separated and discharged vapor and waste water to a temperature-ascended state while generating vapor by heat of wastewater; a first vaporization accelerating unit(7) restoring the temperature-ascended wastewater to the evaporation part by heat-exchanging wastewater with saturated steam; a second vaporization accelerating unit(9) supplying the wastewater to the evaporation part and discharging condensed water; and a control part(11).

Description

Wastewater Treatment System {APPARATUS FOR TREATMENT WASTEWATER}

The present invention relates to a wastewater treatment apparatus, and more particularly, to a wastewater treatment apparatus capable of reducing energy costs by evaporating wastewater by only initial heating energy and energy of a steam compressor and a circulation pump.

In general, wastewater treatment is a process of removing harmful substances or pollutants in wastewater discharged from factories or establishments.

Such wastewater treatment process can be classified into physical treatment, chemical treatment, biological treatment, heat treatment, advanced oxidation method, etc. according to the type or content of the wastewater.

The physical treatment is classified into a screen, a ritual chamber, a clarifier, a floatation tank, and a filtration.

Chemical treatments are classified into adsorption, coagulation, oxidation & reduction, ion exchange, disinfection, and aeration.

In addition, biological treatments are classified into aerobic treatment and anaerobic treatment.

In this wastewater treatment process, in particular, the wastewater treatment method by evaporation is a method in which the wastewater is stored in the evaporation unit and the wastewater is heated, whereby pure water is separated by evaporation and contaminants are concentrated and reprocessed.

At this time, the evaporator is provided with a vacuum pump to reduce the pressure inside the evaporator can be evaporated even at a low temperature.

However, the above-mentioned evaporative wastewater treatment has a problem in that enormous energy costs are required by burning fossil fuel to obtain heat in order to heat the wastewater inside the evaporator.

Therefore, the present invention has been devised to solve this problem, and an object of the present invention is to treat pure water from wastewater by treating the wastewater by evaporating only the initial heat energy and the compressed heat of generated steam without additional heat energy input. It is to provide a wastewater treatment apparatus that can reduce the energy cost.

In order to achieve the object of the present invention as described above, the present invention is a wastewater supply unit for storing / supplying wastewater; The wastewater is connected to the wastewater supply unit by a first pipe line, and the wastewater is heated by the heat supplied from the heater to generate steam, and the wastewater and the steam are separated and discharged, respectively. By doing so, even when supplying less heat than the initial steam can be generated, the remaining waste water is evaporated to be discharged and concentrated; By sucking the steam from the evaporator to add compressed heat to make a saturated steam state, by sucking the wastewater from the evaporator to heat exchange with the saturated steam primarily, the saturated steam is discharged to condensed water, the waste water is A first evaporation acceleration means for accelerating evaporation of the wastewater by returning to the evaporator through a second pipe; The condensed water is connected to the first evaporation acceleration means and the wastewater supply unit, and the condensed water is secondarily exchanged with the condensate supplied from the first evaporation acceleration means and the wastewater supplied from the wastewater supply unit and lower than the condensate. A second evaporation accelerating means for discharging the waste water at room temperature and accelerating evaporation of the waste water by supplying the waste water to the evaporator; And it provides a wastewater treatment apparatus including a wastewater supply unit, an evaporator, and a control unit for controlling the first and second evaporation acceleration means.

In addition, the present invention is a wastewater supply unit for storing / supplying wastewater; The wastewater is connected to the wastewater supply unit through a first pipe line, and the wastewater is heated by heat supplied from a heater to generate steam, and the wastewater and the steam are separated and discharged, respectively. By doing so, even when supplying less heat than the initial steam can be generated, the remaining waste water is evaporated to be discharged and concentrated; A compressor which is connected to the evaporator and sucks and compresses the steam by suction force, and discharges the saturated steam by compressed heat; A circulation pump disposed on a second conduit connecting one side and the other side of the evaporator to suck waste water from the evaporator and return to the evaporator through the second conduit; By being connected to the compressor and the circulation pump, heat exchange is performed between the saturated steam discharged from the compressor and the waste water discharged from the circulation pump and lower than the saturated steam, and the saturated steam is exchanged by the heat exchange. A first heat exchanger which is discharged to condensate and is supplied to the evaporator in a state where the wastewater is heated up; By being connected to the first heat exchanger and the first conduit, the heat exchange between the condensed water discharged from the first heat exchanger and the waste water which is supplied to the evaporator along the first conduit and lower than the condensate is made, A second heat exchanger in which the condensed water is discharged at room temperature by heat exchange, and the waste water is heated to be supplied to the evaporator; And a control unit for controlling the evaporator, the compressor, the circulation unit, and the first and second heat exchangers.

As described above, since the wastewater treatment apparatus according to the present invention initially discharges steam and wastewater stored in the chamber by a suction force of the compressor and the circulation pump to be in a negative pressure state, the wastewater may evaporate even at a low temperature. As the evaporation occurs only by the initial heat energy, and as time passes, the hot steam discharged from the evaporator passes through the first and second heat exchangers sequentially and heat energy is transferred to the wastewater supplied to the evaporator, thereby evaporating the wastewater heated up. Since it is supplied to the unit and added to the initial heat energy, the waste water is evaporated in a state where additional heat energy other than the initial heat energy is not required, thereby reducing the cost of waste water treatment.

Hereinafter, the wastewater treatment apparatus according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

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

As shown, the wastewater treatment apparatus proposed by the present invention includes a wastewater supply unit 1 for storing / supplying wastewater; The wastewater is connected to the wastewater supply unit 1 by a first pipe line L1, and the wastewater is heated by the heat supplied from the heater 3 to generate steam so that the wastewater and the steam are separated and discharged, respectively. Steam and waste water are returned to a heated state, so that even when supplying less heat than the initial generation of steam, the remaining waste water includes an evaporator 5 which is discharged and concentrated.

In addition, the wastewater treatment device inhales the steam from the evaporator 5 to add compressed heat to make a saturated steam state, and sucks the wastewater from the evaporator 5 to exchange heat primarily with the saturated steam. The saturated steam is discharged to the condensed water, the waste water is heated to the first evaporation acceleration means for accelerating the waste water evaporation of the evaporator (5) by returning to the evaporator (5) through a second pipe (L2) 7); The condensate supplied from the first evaporation acceleration means 7 and the wastewater supply unit 1 and the condensate supplied from the first evaporation acceleration means 7 and the wastewater supply unit 1 are lower than the condensate. A second evaporation acceleration means for accelerating the wastewater evaporation of the evaporator 5 by heat-exchanging wastewater at a temperature secondly and discharging the condensate at room temperature, and supplying the waste water to the evaporator 5 ( 9); And a control unit 11 for controlling the wastewater supply unit 1, the evaporation unit 5, and the first and second evaporation acceleration means 7 and 9.

In the wastewater treatment apparatus having such a structure, the wastewater supply unit 1 is connected to one side of the first pipe line (L1) and disposed on the wastewater storage tank (13) in which the waste water is stored, and on the first pipe line (L1). A supplementary water pump 15 for sucking wastewater at room temperature from the wastewater storage tank 13 and supplying the wastewater to a second heat exchanger 33 to be described later.

Therefore, when the replenishment water pump 15 operates, the wastewater at room temperature stored in the wastewater reservoir 13 is supplied to the second heat exchanger 33 along the first pipe line L1, and then the evaporator ( 5) is supplied.

At this time, since the hot fruit is not supplied to the second heat exchanger in the initial operating state of the wastewater treatment device, the wastewater is evaporated along the first pipe line L1 in a room temperature state without heat exchange in the second heat exchanger 33. It is supplied to the part 5.

In the normal operation of the wastewater treatment device, since the fluid at a high temperature is supplied to the second heat exchanger 33, the wastewater at room temperature pumped by the replenishment water pump 15 causes the second heat exchanger 33 to operate. While passing through it may be supplied to the evaporator 5 in a high temperature state, preferably heated to a temperature range of about 90 to 98 degrees.

The evaporator 5 includes a chamber 19 in which a predetermined volume of space is formed to store waste water; An injector 21 provided in the chamber 19 and connected to the first conduit L1 to inject waste water; A heater (3) connected to one side of the chamber (19) to heat the interior of the chamber (19); A specific gravity separation partition 23 provided in the lower portion of the chamber 19 to separate wastewater according to specific gravity; A water level detector (25) provided at one side of the chamber (19) for sensing the level of waste water; It is provided in the chamber 19 includes a temperature sensor 27 for detecting the internal temperature of the chamber (19).

In the evaporator having such a structure, the injector 21 has a tubular shape, and at least one injection hole is formed in the tubular body.

Therefore, the wastewater supplied by the first pipe line L1 may be stored at a predetermined level by being injected into the chamber 19 through the injection holes of the injector 21.

In this case, the water level of the wastewater stored in the chamber 19 may be detected by the water level detector 25. The water level sensor 25 transmits the detected water level signal to the controller 11.

In addition, the temperature sensor 27 detects an internal temperature of the chamber 19 and transmits the detected signal to the controller 11.

In addition, the heater 3 may be a variety of heat supply method such as hot wire method, steam method, preferably means a steam method.

That is, the internal temperature of the chamber 19 may be increased by supplying steam having a predetermined temperature heated by the steam supply device (not shown) to the inside of the chamber 19.

Therefore, the pure water in the wastewater stored in the chamber 19 can be separated from the wastewater by evaporation to a vapor state.

At this time, the temperature of the steam is preferably maintained at a temperature range of about 90 degrees to 98 degrees. Therefore, the internal temperature of the chamber 19 is a temperature range of the initial temperature of about 90 degrees to 98 degrees.

In addition, the specific gravity separating partition 23 has a shape protruding upward from the bottom surface of the chamber 19. Therefore, the foreign matter having a high specific gravity in the wastewater stored in the chamber 19 is filtered by the partition wall 23 to settle under the chamber 19 and discharged into the concentration tank.

On the other hand, the foreign matter having a relatively low specific gravity is supplied to the second pipeline L2 beyond the partition 23.

On the other hand, the first evaporation acceleration means (7) is connected to the evaporator (5) and the compressor (29) for discharging in the saturated steam state by the heat of compression by sucking and compressing the steam by the suction force; By being disposed on the second pipe line (L2) connecting one side and the other side of the evaporator (5), the waste water is sucked from the evaporator (5) and the evaporator (5) through the second pipe (L2) A circulation pump 31 for returning to the pump; And a heat exchange between the saturated steam discharged from the compressor 29 and the wastewater discharged from the circulation pump 31 and lower than the saturated steam by being connected to the compressor 29 and the circulation pump 31. In this case, the saturated steam is discharged to condensed water by the heat exchange, and the waste water includes a plate-shaped first heat exchanger 17 which is supplied to the evaporator 5 in a heated state.

In the first evaporation acceleration means, the compressor 29 is connected to the evaporation unit 5 through the third pipe line L3 and the outlet side is connected to the evaporator 5 through the fourth pipe line L4. 17).

At this time, the third pipe line (L3) is connected to the upper portion of the chamber 19 can be introduced only steam.

Therefore, when the compressor 29 is driven, the vapor evaporated in the chamber 19 by the suction force of the compressor 29 is sucked into the compressor 29 through the third conduit L3.

In addition, the steam sucked in the compressor 29 is heated to a temperature range of about 105 to 115 degrees by adding the heat of compression in the process of being compressed by the compressor 29, thereby becoming a saturated steam state.

For example, when the outlet pressure of the compressor 29 reaches 1.5 kg / cm ² a, the temperature of the saturated steam reaches about 105 degrees to 110 degrees.

As a result, the steam is heated to a temperature range of about 105 to 115 degrees while passing through the compressor 29 in a temperature range of about 90 degrees to 98 degrees in the chamber 19 to be saturated steam or superheated steam.

In addition, when the compressor 29 and the circulating pump 31 to be described later are driven, the internal steam and the waste water of the chamber 19 are respectively compressed through the second conduit L2 and the third conduit L3. ) And the circulation pump 31, so that the inside of the chamber 19 becomes a negative pressure state.

Therefore, since the chamber 19 has a negative pressure inside, the evaporation can be performed at a lower temperature, thereby creating an environment in which steam can be generated more smoothly.

The circulation pump 31 is disposed on the second conduit L2, and when the circulation pump 31 is driven, the waste water stored in the chamber 19 is sucked into the second conduit L2, and the It is supplied to the first heat exchanger 17 through a circulation pump 31.

At this time, the wastewater sucked through the second pipe line (L2) is the wastewater that has not been evaporated inside the chamber 19, and is returned to the chamber 19 again through the circulation pump 31 and is evaporated with steam. By repeatedly passing through, it is finally purified in a vapor state.

In the first heat exchanger 17, heat exchange may be performed between a relatively high temperature saturated steam discharged from the compressor 29 and a relatively low temperature circulating water supplied from the circulation pump 31.

The first heat exchanger 17 preferably comprises a plate-like latent heat exchanger. In this case, the plate latent heat exchanger means a heat exchanger having a conventional structure. Of course, in addition to the plate-shaped latent heat exchanger is also possible shell and tube heat exchanger.

The first heat exchanger 17 heats the saturated steam of about 105 degrees to 115 degrees with circulating water of about 90 degrees to 98 degrees, and the saturated steam is cooled to condensate water of about 101 degrees to 105 degrees, and the circulating water is Heated to about 101 to 105 degrees.

On the other hand, the second evaporation acceleration means (9) is connected to the first evaporation acceleration means (7) to evaporate the sensible heat of condensed water discharged from the second evaporation acceleration means (9) through the first pipe line (L1) The wastewater is heated up by transferring it to the wastewater supplied to the unit 5.

The second evaporation acceleration means (9) includes a gas-liquid separator (35) for supplying the condensed water discharged from the first heat exchanger (17) to separate gas in the condensed water; Heat exchange is performed between the condensed water connected to the gas-liquid separator 35 and the waste water supplied to the evaporator 5 along the first pipe line L1 and lower than the condensed water. By the heat exchange, the condensate includes a plate-shaped second heat exchanger 33 which is discharged at room temperature.

The gas-liquid separator 35 means a gas-liquid separator 35 having a conventional structure. The gas-liquid separator 35 separates the uncondensed vapor from the condensed water even in the temperature range of 101 degrees to 105 degrees in the condensed water supplied through the fifth pipe line L5.

At this time, the gas-liquid separator 35 may discharge not only steam but also gases such as a solvent.

As such, the high temperature condensed water that has passed through the gas-liquid separator 35 is supplied to the second heat exchanger 33 in a temperature range of about 98 degrees to 102 degrees, and cooled to room temperature by heat exchange with relatively low temperature wastewater. After it is discharged.

The second heat exchanger 33 preferably comprises a plate-shaped sensible heat exchanger. Of course, in addition to the plate-shaped sensible heat exchanger, a shell and tube heat exchanger is also possible.

The second heat exchanger 33 heats the condensate of about 98 degrees to 102 degrees with the wastewater at room temperature, thereby cooling the condensate to room temperature, and the wastewater is heated to about 92 degrees to 98 degrees.

The cooled condensed water is stored in the treated water storage tank 40, and the heated wastewater is supplied to the chamber 19 through a first pipe line L1.

As described above, since steam and wastewater stored in the chamber 19 are instantaneously discharged to a negative pressure state by suction power of the compressor 29 and the circulation pump 31, the wastewater may evaporate even at a low temperature. As a result, evaporation occurs only by the initial heat energy, and as time passes, hot steam discharged from the evaporator 5 sequentially passes through the first and second heat exchangers 17 and 33 to the evaporator 5. Since heat energy is transferred to the wastewater to be supplied, the wastewater heated up is supplied to the evaporator 5 and added to the initial heat energy, so that the wastewater can be evaporated in a state in which additional heat energy other than the initial heat energy is not required.

Hereinafter, the operation of the wastewater treatment apparatus according to the present invention will be described in more detail with reference to the accompanying drawings.

As shown in FIG. 1, when the wastewater is purified using the wastewater treatment apparatus proposed by the present invention, first, steam is supplied to the chamber 19 of the evaporator 5 so that the temperature inside the chamber 19 is increased. Rises from about 93 degrees to 98 degrees.

In this state, the supplemental water supplemental water pump 15 operates to supply wastewater stored in the wastewater reservoir 13 to the second heat exchanger 33 and to the chamber 19 through the first pipe line L1. .

At this time, in the first heat exchanger 17, since the high-temperature fluid is not supplied to the first heat exchanger 17, heat exchange to the wastewater is not performed.

As such, the wastewater supplied to the chamber 19 is sprayed by the injector 21 and stored at a predetermined level in the chamber 19. At this time, a part of the waste water is vaporized by the temperature inside the chamber 19 to become a vapor state.

In addition, the compressor 29 and the circulation pump 31 are driven to discharge steam and wastewater in the chamber 19 to the outside of the chamber 19 through the second and third conduits L2 and L3. .

Therefore, since the inside of the chamber 19 is in a negative pressure state, an environment in which wastewater can be evaporated even at a low temperature is created. That is, although the chamber 19 is in a temperature range of about 90 degrees to 98 degrees in the initial state, it is possible to evaporate even at this temperature.

As such, the steam sucked by the compressor 29 through the third pipe line L3 passes through the compressor 29 to add compressed heat, and is heated to a temperature range of about 105 degrees to 115 degrees, thereby becoming saturated steam.

The saturated steam is supplied to the first heat exchanger 17 through the fourth pipe line L4, and heat exchanges with the circulated water supplied by the circulation pump 31 in the first heat exchanger 17.

At this time, the saturated steam is a temperature range of about 105 degrees to 115 degrees, and the circulating water is a temperature range of about 90 to 98 degrees.

Accordingly, the saturated steam and the circulating water are exchanged with each other by the first heat exchanger 17, so that the saturated steam is cooled to a temperature range of about 100 degrees to 105 degrees to be condensed water, and the circulating water is about 101 degrees to 105 degrees. It is returned to the chamber 19 by heating to a temperature range.

At this time, since the heated circulating water returns to the chamber 19, the internal temperature of the chamber 19 increases in a temperature range of 90 to 98 degrees and becomes 100 degrees or more, so that the waste water is more easily evaporated inside the chamber 19. This can be done.

On the other hand, the condensed water discharged from the first heat exchanger 17 is supplied to the gas-liquid separator 35 to separate the non-condensed gas, cooled and discharged to a temperature range of about 98 degrees to 102 degrees.

The discharged condensate is supplied to the second heat exchanger 33 to exchange heat with the wastewater supplied through the first pipe line L1.

That is, in the second heat exchanger 33, the condensate of about 98 degrees to 102 degrees is exchanged with the wastewater at room temperature, so that the condensate is cooled to room temperature, and the wastewater is heated to about 92 degrees to 98 degrees.

The cooled condensed water is stored in the treated water storage tank, and the heated wastewater is supplied to the chamber 19 through the first pipe line L1.

Meanwhile, the wastewater remaining without evaporation in the wastewater of the chamber 19 may be reprocessed by being precipitated in the lower portion of the chamber 19 by the specific gravity difference and stored in the brine storage tank 41.

As described above, since steam and wastewater stored in the chamber 19 are instantaneously discharged to a negative pressure state by suction power of the compressor 29 and the circulation pump 31, the wastewater may evaporate even at a low temperature. Evaporation occurs only by the initial heat energy, and as time passes, the hot steam discharged from the evaporator 5 sequentially passes through the first and second heat exchangers 17 and 33 and is supplied to the evaporator 5. Since the heat energy is transferred to the wastewater to be supplied to the evaporator 5 and is added to the initial heat energy, the wastewater may be evaporated in a state in which additional heat energy other than the initial heat energy is not required.

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

Claims (7)

A wastewater supply unit in which wastewater is stored / supplied; The wastewater is connected to the wastewater supply unit by a first pipe line, and the wastewater is heated by the heat supplied from the heater to generate steam, and the wastewater and the steam are separated and discharged, respectively. By doing so, even when supplying less heat than the initial steam can be generated, the remaining waste water is evaporated to be discharged and concentrated; By sucking the steam from the evaporator to add compressed heat to make a saturated steam state, by sucking the wastewater from the evaporator to heat exchange with the saturated steam primarily, the saturated steam is discharged to condensed water, the waste water is A first evaporation acceleration means for accelerating evaporation of the wastewater by returning to the evaporator through a second pipe; The condensed water is connected to the first evaporation acceleration means and the wastewater supply unit, and the condensed water is secondarily exchanged with the condensate supplied from the first evaporation acceleration means and the wastewater supplied from the wastewater supply unit and lower than the condensate. A second evaporation accelerating means for discharging the waste water at room temperature and accelerating evaporation of the waste water by supplying the waste water to the evaporator; And And a control unit for controlling the waste water supply unit, the evaporation unit, and the first and second evaporation acceleration means. A wastewater supply unit in which wastewater is stored / supplied; The wastewater is connected to the wastewater supply unit through a first pipe line, and the wastewater is heated by heat supplied from a heater to generate steam, and the wastewater and the steam are separated and discharged, respectively. By doing so, even when supplying less heat than the initial steam can be generated, the remaining waste water is evaporated to be discharged and concentrated; A compressor which is connected to the evaporator and sucks and compresses the steam by suction force, and discharges the saturated steam by compressed heat; A circulation pump disposed on a second conduit connecting one side and the other side of the evaporator to suck waste water from the evaporator and return to the evaporator through the second conduit; By being connected to the compressor and the circulation pump, heat exchange is performed between the saturated steam discharged from the compressor and the waste water discharged from the circulation pump and lower than the saturated steam, and the saturated steam is condensed by the heat exchange. A first heat exchanger supplied to the evaporator in a state in which the wastewater is heated up; By being connected to the first heat exchanger and the first conduit, the heat exchange between the condensed water discharged from the first heat exchanger and the waste water which is supplied to the evaporator along the first conduit and lower than the condensate is made, A second heat exchanger in which the condensed water is discharged at room temperature by heat exchange, and the waste water is heated to be supplied to the evaporator; And And a control unit for controlling the evaporator, the compressor, the circulation means, and the first and second heat exchangers. The method according to claim 1 or 2, A chamber in which a predetermined volume of space is formed in the evaporator to store waste water; An injector provided in the chamber and connected to the first conduit to inject waste water; A heater connected to one side of the chamber to heat the inside of the chamber; A specific gravity separation barrier provided in the lower portion of the chamber to separate the wastewater according to specific gravity; A water level detector provided at one side of the chamber to detect the level of waste water; Waste water treatment apparatus provided in the chamber comprising a temperature sensor for sensing the internal temperature of the chamber. The method of claim 1, The first evaporation acceleration means is connected to the evaporator to suck the steam by the suction force to compress by ejecting the saturated steam state by the heat of compression; A circulation pump disposed on a conduit connecting one side and the other side of the evaporator to suck waste water from the evaporator and return to the evaporator through the conduit; And By being connected to the compressor and the circulation pump, heat exchange is performed between the saturated steam discharged from the compressor and the waste water discharged from the circulation pump and lower than the saturated steam, and the saturated steam is condensed by the heat exchange. The wastewater treatment apparatus comprising a plate-shaped first heat exchanger is discharged to the evaporation unit in a state where the wastewater is heated up. The method of claim 1, The second evaporation acceleration means is connected to the first evaporation acceleration means, the gas-liquid separator for supplying the condensate discharged from the first heat exchanger to separate the gas in the condensate; Heat exchange is performed between the condensed water connected to the gas-liquid separator and the waste water supplied to the evaporation unit along the first pipe and lower than the condensed water, and the condensed water is discharged at room temperature by the heat exchange. Wastewater treatment apparatus comprising a plate-shaped second heat exchanger. 3. The method of claim 2, A gas-liquid separator is further included between the first and second heat exchangers to remove the gas contained in the condensed water discharged from the first heat exchanger. 3. The method of claim 2, And the first heat exchanger is a plate-shaped latent heat exchanger, and the second heat exchanger is a plate-shaped sensible heat exchanger.

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