KR20090018403A - Apparatus and method for purifying waste-water using a distillation under reduced pressure - Google Patents

Abstract

An apparatus and a method for treating wastewater of food waste using distillation under reduced pressure are provided to simply separate and remove various sludges from the wastewater of food waste using distillation under reduced pressure without using chemicals or expensive forced separation equipment. An apparatus for treating wastewater of food waste using distillation under reduced pressure comprises a heater(D1), a reduced pressure evaporator(D2), and a heat exchanger. The heater heats wastewater of food waste with heat of steam. The reduced pressure evaporator generates water vapor by evaporating the wastewater of food waste heated by the heater in a reduced pressure state. The heat exchanger obtains condensed wastewater by cooling the water vapor discharged from the reduced pressure evaporator.

Description

Apparatus and method for purifying waste-water using a distillation under reduced pressure}

The present invention relates to an apparatus and method for treating wastewater of food waste using reduced pressure distillation, which can easily treat wastewater generated in a process of treating various food wastes by a reduced pressure distillation method.

In general, the food waste is incinerated and landfilled or dried and fermented in a state where water contained in the solid is removed while undergoing a predetermined treatment, and is recycled as organic fertilizer or compost.

In addition, the wastewater (water) generated in the process of treating food waste in this way is largely water-treated to have a degree of purification that can be discharged by separating and removing various sludges by chemical and physical treatment methods.

The chemical water treatment method proceeds by mixing one or more chemicals in the wastewater and separating or decomposing sludge from the wastewater in a conventional manner by chemical reaction of the chemicals.

Then, the physical water treatment method, for example, proceeds by forcibly separating the sludge contained in the waste water using a forced separation device such as a centrifuge.

However, since the chemical water treatment method requires periodic mixing of chemicals (eg, flocculants) with waste water at a predetermined rate, excessive costs are required due to chemical consumption.

In addition, oil-based sludge contained in the waste water is difficult to be separated and removed smoothly using chemicals.

Moreover, secondary contamination may be caused by the chemicals contained in the wastewater, and the chemical reaction time of the chemical agent is excessive, so that there is a limitation in treating the wastewater in large quantities.

In addition, the physical water treatment method is not only excessively expensive to manufacture the equipment compared to the chemical water treatment method, but also by using a forced separation device (centrifugal separator) by the forced separation method can not expect satisfactory separation and removal efficiency. .

In addition to the above two water treatment methods, for example, a method of marine dumping of wastewater on the high seas using a ship is known, but an excessive cost is required because a vessel for carrying wastewater must be used.

In particular, the ocean dumping may cause a serious problem of causing environmental pollution of the sea and destruction of the ecosystem by various sludge (oil material) contained in the waste water.

Therefore, the present invention has been proposed to solve the above problems,

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for treating wastewater of food waste using vacuum distillation, which can extract water contained in the wastewater of food waste by distillation under reduced pressure to treat water to be separated from various sludges. have.

In order to achieve the object as described above,

A heater for heating the waste water of the food waste with steam heat;

A reduced pressure evaporator for generating water vapor by evaporating the waste water of the food waste heated by the heater in a reduced pressure state;

A heat exchanger for cooling the water vapor from the reduced pressure evaporator to obtain condensed waste water;

Provides a wastewater treatment apparatus for food waste using reduced pressure distillation comprising a.

And in order to realize the above another object of the present invention,

A heating step of heating the waste water of the food waste with steam heat of the heater;

A reduced pressure evaporation step for obtaining water vapor by evaporating the waste water of the food waste heated to a predetermined temperature under a reduced pressure evaporator;

A heat exchange step of cooling the water vapor from the reduced pressure evaporator with a heat exchanger to obtain condensation wastewater;

It provides a wastewater treatment method of food waste using reduced pressure distillation comprising a.

As described above, the present invention can easily separate and remove various sludges from the wastewater of food waste by a reduced pressure distillation method without using a chemical or an expensive forced separator.

In particular, according to the reduced pressure distillation method, since the wastewater of the food waste heated to a certain temperature is evaporated in a reduced pressure atmosphere to generate water vapor, and condensation of water vapor to distill it, compared to conventional chemical or physical water treatment methods. Not only is the production cost low, but the work process is simple, so that a large amount of waste water can be easily treated.

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

Embodiments of the present invention are described to the extent that those of ordinary skill in the art can practice the present invention.

Therefore, since the embodiments of the present invention may be modified in various other forms, the claims of the present invention are not limited to the embodiments described below.

1 is a view schematically showing the overall structure of a wastewater treatment apparatus for food waste using reduced pressure distillation according to an embodiment of the present invention.

And, Figure 2 is a process diagram showing the whole work process of the wastewater treatment method of food waste using distillation under reduced pressure according to an embodiment of the present invention, S1 denotes a heating step.

The heating step (S1) is a waste water (W) from the waste water storage tank (T1) in a state in which the food waste waste water (W, hereinafter referred to as "waste water") is stored in the wastewater storage tank (T1) shown in FIG. Proceed with heating by heating to a constant temperature.

The heating step S1 uses a heater D1 having a structure capable of heating the wastewater W by an indirect heating method using steam H1.

As shown in FIG. 1, the heater D1 has a plurality of heating transfer pipes P1 located therein, and a heat generating space A1 capable of heating the outer surface of the heating transfer pipe P1 with steam H1. Has

The heater (D1) is connected to the first supply pipe (L1) to supply the waste water (W) from the waste water storage tank (T1) into the heating transfer pipe (P1), the first supply pipe (L1) On one side, the supply pump M1 is installed.

The supply pump M1 may use a conventional fluid pump, and operates to supply wastewater W of the wastewater storage tank T1 to the heater D1.

The heater D1 is connected to the boiler Q generating steam H1 and steam supply pipes Q1 and Q2 as shown in FIG. 1.

The boiler Q may be circulated and supplied with the steam H1 into the heat generating space A1 along the steam supply pipes Q1 and Q2.

Therefore, the heater D1 operates to be heated by indirect heat by steam H1 such that the wastewater W passing through the heating transfer pipe P1 becomes a predetermined temperature or more.

The heater D1 operates to maintain the wastewater W temperature approximately 60 degrees Celsius or more. If the temperature of the wastewater (W) is less than 60 degrees Celsius, it is not possible to smoothly generate steam (W1) from the wastewater (W) in the reduced pressure evaporation step (S2) described later.

After heating the wastewater (W) to a predetermined temperature while going through the heating step (S1) as described above, the depressurization evaporation step (S2) is performed.

The reduced pressure evaporation step (S2) uses a reduced pressure evaporator (D2) connected to the heater (D1) as a second supply pipe (L2) as shown in FIG. 1.

The reduced pressure evaporator (D2) may be in the form of a cylindrical tank having a predetermined size of the evaporation space (A2).

In addition, the reduced pressure evaporator (D2) is connected to the pressure reducing pump (M2) and the third supply pipe (L3) to form the inside of the evaporation space (A2) in a reduced pressure atmosphere.

The pressure reducing pump M2 may use a conventional vacuum pump, and operates to form the inside of the evaporation space A2 in a reduced pressure atmosphere while negative pressure acts through the third supply pipe L3.

The evaporation space (A2) is set to maintain a reduced pressure of the atmosphere pressure of approximately 1 atm or less by the driving of the pressure-reducing pump (M2).

Thus, when the evaporation space (A2) is formed in a reduced pressure atmosphere of 1 atm or less, the boiling point of the waste water (W) contained in the evaporation space (A2) can be lowered to 100 degrees Celsius or less (about 60 degrees Celsius). .

Therefore, by supplying the waste water (W) heated to maintain a temperature of 60 degrees Celsius in the heater (D1) to the evaporation space (A2) it can be smoothly generated from the steam (W1) from the waste water (W).

In addition, the vacuum evaporator (D2) is connected to the first recovery tank (T2) and the first discharge pipe (L4) as shown in FIG.

The first recovery tank T2 is for storing the concentrated wastewater W2 (sludge concentrate) remaining after the water vapor W1 evaporates from the wastewater W contained in the evaporation space A2.

Wastewater treatment method of food waste using reduced pressure distillation according to an embodiment of the present invention may further comprise a circulation step (S1-1).

The circulation step (S1-1) is for circulating and supplying the wastewater (W) from the heater (D1) side to the reduced-pressure evaporator (D2) side.

That is, as shown in FIG. 1, a circulation supply pipe L2-1 is connected between the heater D1 and the reduced pressure evaporator D2.

Then, a circulation pump M3 is installed at one side of the circulation supply pipe L2-1. As this forward circulation pump M3, a normal fluid pump can be used.

Therefore, the waste water (W) is supplied from the heater (D1) side to the decompression evaporator (D2) side along the second supply pipe (L2) when the circulation pump (M3) is driven, and again the circulation supply pipe ( It may be circulated to the heater (D1) side along L2-1).

By circulating the waste water (W) in this way, since the waste water (W) heated to a predetermined temperature can be continuously supplied to the reduced pressure evaporator (D2), the water vapor (W1) more smoothly when the reduced pressure evaporation step (S2) is performed. Can be generated.

On the other hand, the wastewater treatment method of food waste using reduced pressure distillation according to an embodiment of the present invention comprises a heat exchange step (S3).

The heat exchange step (S3) condenses the water vapor (W1) generated in the reduced pressure evaporator (D3) to obtain water from which sludge is removed from the waste water (W), that is, condensation wastewater (W1-1).

The heat exchange step (S3) is performed in the heat exchanger (D3) installed at one side of the third supply pipe (L3) connecting the reduced pressure evaporator (D2) and the booster pump (M2) as shown in FIG. 1.

The heat exchanger (D3) is provided with a cooling space (A3) is cooled by the cooling water (H2), the cooling space (A3) is made of a conventional water-cooled heat exchange structure installed with a plurality of cooling feed pipes (P2). .

The plurality of cooling transfer pipes P2 are installed in the cooling space A3 so that the water vapor W1 discharged from the reduced pressure evaporator D2 may pass along the third supply pipe L3.

The heat exchanger (D3) is connected to the cooling water supply device (R) to the cooling water supply pipe (R1, R2) as shown in Figure 1 so that the cooling water (H2) is circulated supply into the cooling space (A3).

In addition, a second recovery tank T3 for storing the liquefied condensed waste water W1-1 while passing through the heat exchanger D3 is installed at one side of the third supply pipe L3 as shown in FIG. 1.

The condensed waste water W1-1 contained in the second recovery tank T3 is discharged to the outside through a second discharge pipe L5 connected to the second recovery tank T3.

The heat exchanger (D3) is a pressure-sensitive evaporator (D2) inside the decompression state, the water vapor (W1) of the waste water (W) is to pass through the cooling feed pipe (P2) along the third supply pipe (L3). It can be condensed by cooling (heat exchange) action.

The condensed waste water W1-1 liquefied by this action is contained in the second recovery tank T3 and the gas W1-2 is discharged through the pressure reducing pump M2.

Therefore, the heat exchange step (S3) can obtain the condensed wastewater (W1-1) in which the sludge is removed from the wastewater (W) by the reduced pressure distillation method.

The condensate wastewater W1-1 contained in the second recovery tank T3 may be discharged in a state of being purified once more by a conventional method by discharging it to a sewage pipe or supplying it to a wastewater treatment plant, although not shown in the drawing.

In particular, supplying the condensate wastewater (W1-1) to the wastewater treatment plant with the concentrated wastewater (W2) removed from the wastewater (W) thus solves problems that may be caused by sludge (oil material) during the water treatment operation. Can be.

Wastewater treatment method of food waste using reduced pressure distillation according to an embodiment of the present invention, may further comprise a first post-treatment step (S2-1).

The first after-treatment step (S2-1) is for producing a feed (W2-1) from the concentrated wastewater (W2) contained in the first recovery tank (T2).

As shown in FIG. 1, the first post-processing step (S2-1) is performed in the feed manufacturing apparatus D4 connected to the first recovery tank T2 and the third discharge pipe L6.

The feed manufacturing apparatus (D4) is not shown in the figure, but is made of a conventional structure that can produce a feed (W2-2) by drying the various sludge of the waste water (W).

That is, the feed manufacturing apparatus (D4) may be prepared by drying the concentrated wastewater (W2) having a low water content and a large amount of various sludges as the water vapor (W1) is evaporated on the decompression evaporator (D3) side.

In addition, the wastewater treatment method of food waste using reduced pressure distillation according to an embodiment of the present invention may further include a second post-treatment step (S3-1).

The second post-treatment step (S3-1) is for deodorizing the gas (W1-2) discharged through the decompression pump (M2) when the depressurization evaporation step (S2) is performed.

As shown in FIG. 1, the second aftertreatment step S3-1 is performed in a deodorizer D5 connected to the pressure reducing pump M2 and the fourth discharge pipe L7.

Although the deodorizer D5 is not shown in the drawing, a plurality of filters are provided therein, and the deodorizer D5 may have a conventional structure capable of deodorizing the gas W1-2 by the filters.

Therefore, the wastewater treatment method of food waste using reduced pressure distillation according to an embodiment of the present invention, the gas discharged to the outside through the pressure-reducing pump (M2) when the wastewater (W) water treatment in a reduced pressure distillation method In (W1-2), it can be easily deodorized to prevent odor.

In addition, a pipe (W, W1, W1-1, W1-1, W1-1, in a state required for water treatment work) is installed in the pipe body connecting the devices for performing the respective working steps, as shown in Figure 1, a conventional control valve (V). , W1-2, W2, W2-1) can be controlled easily.

1 is a view schematically showing the overall structure of a wastewater treatment apparatus for food waste using reduced pressure distillation according to an embodiment of the present invention.

Figure 2 is a process chart showing the whole working process of the wastewater treatment method of food waste using reduced pressure distillation according to an embodiment of the present invention.

Claims (14)

A heater for heating the waste water of the food waste with steam heat; A reduced pressure evaporator for generating water vapor by evaporating the waste water of the food waste heated by the heater in a reduced pressure state; A heat exchanger for cooling the water vapor from the reduced pressure evaporator to obtain condensed waste water; Wastewater treatment apparatus of food waste using reduced pressure distillation comprising a. The method according to claim 1, The heater, Food waste using a reduced pressure distillation, characterized in that it has a heating space in which a plurality of heating transfer pipes through which waste water of food waste passes, and indirectly heats waste water of food waste with the steam heat by supplying steam into the heating space. Wastewater treatment device of trash. The method according to claim 1, The heater, Wastewater treatment apparatus of the food waste using reduced pressure distillation, characterized in that for heating so that the waste water temperature of the food waste maintain 60 degrees Celsius or more. The method according to claim 1, The vacuum evaporator, It has an evaporation space in which a reduced pressure state is formed by the driving of the pressure reducing pump, Wastewater treatment apparatus for food waste using reduced pressure distillation so that water vapor generated from the wastewater of the food waste contained in the evaporation space is transferred to the heat exchanger. The method according to claim 1, The heat exchanger, It has a cooling space in which a cooling transfer pipe through which water vapor generated from waste water of food waste passes. Supplying cooling water to the cooling space condensing water vapor while cooling the outer surface of the cooling feed pipe for condensation waste water, characterized in that waste water treatment apparatus for food waste using reduced pressure distillation. The method according to claim 1, The wastewater treatment apparatus for food waste using the reduced pressure distillation further includes a first aftertreatment apparatus. The first post-processing device, A wastewater treatment apparatus for food waste using reduced pressure distillation, characterized in that the feed manufacturing device is capable of producing a feed by receiving the concentrated wastewater containing sludge from the reduced pressure evaporator. The method according to claim 1, The wastewater treatment apparatus for food waste using the reduced pressure distillation further includes a second aftertreatment apparatus. The second post-processing device, Wastewater treatment apparatus for food waste using reduced pressure distillation, characterized in that made of a deodorizer installed to deodorize the gas inside the reduced pressure evaporator. A heating step of heating the waste water of the food waste with steam heat of the heater; A reduced pressure evaporation step for obtaining water vapor by evaporating the waste water of the food waste heated to a predetermined temperature under a reduced pressure evaporator; A heat exchange step of cooling the water vapor from the reduced pressure evaporator with a heat exchanger to obtain condensation wastewater; Wastewater treatment method of food waste using reduced pressure distillation comprising a. The method according to claim 8, The heating step, Wastewater treatment method of food waste using reduced pressure distillation, characterized in that for heating by the steam heat of the heater to maintain the waste water temperature of food waste 60 degrees Celsius or more. The method according to claim 8, The reduced pressure evaporation step, A method for treating wastewater from food waste using reduced pressure distillation, wherein the inside of the vacuum evaporator is formed under reduced pressure to generate water vapor from the wastewater of food waste in a boiling point of 100 degrees Celsius or less. The method according to claim 8, The heat exchange step, A wastewater treatment method for food waste using reduced pressure distillation, characterized by cooling condensing water vapor with cooling water in a heat exchanger to obtain condensation wastewater. The method according to claim 8, The wastewater treatment method of food waste using the vacuum distillation further includes a first post-treatment step, The first post-processing step, Wastewater treatment method of the food waste using reduced pressure distillation, characterized in that for producing a feed while receiving the concentrated wastewater evaporated moisture in the reduced pressure evaporator. The method according to claim 8, The wastewater treatment method of food waste using the reduced pressure distillation further includes a second post-treatment step, The second post-processing step, Wastewater treatment method of food waste using reduced pressure distillation, characterized in that the degassing inside the vacuum evaporator with a deodorizer. The method according to claim 8, Wastewater treatment method of food waste using the vacuum distillation, further comprises a circulation step, The circulation step, A wastewater treatment method for food waste using reduced pressure distillation, characterized by circulating and supplying wastewater of food waste heated to a predetermined temperature from the heater side to the reduced pressure evaporator side.

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