KR101155750B1 - A sludge treatment apparatus - Google Patents

Abstract

Disclosed is a sludge treatment apparatus that can contribute to alternative energy production. The sludge treatment apparatus according to the present invention is to treat organic sludge and energize it, and dewater the sludge in multiple stages with a moisture content of 65 wt% or less, and the final dehydration step is dehydration for dewatering the sludge using an electropenetrating dehydration method. Unit, and a sludge coal production unit for drying and crushing the dewatered sludge by centrifugal force by aerodynamic (Aero-Dynamic) to form a sludge coal. According to this configuration, the sludge having a low water content can be easily dried and pulverized to be produced as sludge coal, thereby contributing to the energy efficiency of the sludge having high efficiency.

Sludge, treated, dehydrated, dried, crushed, sludge coal, energy, alternative.

Description

Sludge Treatment Unit {A SLUDGE TREATMENT APPARATUS}

The present invention relates to a sludge treatment apparatus, and more particularly, to a sludge treatment apparatus capable of alternatively energizing sludge containing organic sludge particles.

In general, sludge, which is a sediment during treatment of wastewater, is generated in wastewater treatment facilities such as sewage treatment plants or wastewater treatment plants. This sludge is treated through a dehydration process that separates it from moisture. At this time, the dewatering process of the sludge is mainly adopted by the filter press dewatering method or belt press dewatering method by a filter such as filter cloth.

On the other hand, the dewatered sludge as described above is treated by landfill or ocean dumping, or incinerated or recycled through a multi-stage dewatering process. Here, the treatment method of the dewatered sludge is generally high in the order of landfill, incineration, recycling and ocean dumping. That is, it is the most common that the dewatered sludge is ocean dumped.

By the way, the sludge contains a high rate of carbon dioxide as it includes organic sludge particles. Therefore, as the sludge dumped into the ocean destroys the environment as a pollution source polluting the ocean, ocean dumping of the sludge has been pointed out as an inappropriate treatment method. In addition, the 1996 Protocol of the London Convention, which bans dumping of waste at sea after February 2012, calls for new treatment of sludge to replace the dumping of waste at sea.

The present invention has been made in view of the above problems, and an object thereof is to provide a sludge treatment apparatus capable of reducing environmental pollution.

Another object of the present invention is to provide a sludge treatment apparatus capable of energizing dewatered sludge at low water content.

Still another object of the present invention is to provide a sludge treatment method for achieving the above object.

The sludge treatment apparatus according to the present invention for achieving the above object is to treat the organic sludge and to energize, the dewatering unit for dewatering the sludge, and dried and pulverized the dewatered sludge by centrifugal force into sludge coal It includes a sludge coal production unit to make energy by producing.

The dehydration unit, the dehydration unit is provided with a plurality of dehydrator dewatering the sludge in multiple stages, according to an embodiment of the present invention, the first dehydrator is a belt press dewatering method, the second dehydrator is an electropenetration dehydration method is adopted It is illustrated as being. Here, the second dehydrator is a drum, a caterpillar rotated along at least a part of an outer circumferential surface of the drum, a moving belt for moving the sludge to the drum and the caterpillar, and a power applying unit for applying different polarities to the drum and the caterpillar, respectively. Include. By this dehydration unit, the sludge is dehydrated up to a water content of 60 wt%.

The sludge coal production unit includes a dry crusher for drying the dehydrated sludge to a water content of 30 wt% or less by using a centrifugal stream and pulverizing the fine sludge into a fine particle, and a molding machine for molding the crushed sludge into the sludge coal. do.

Here, the drying grinder is provided with a centrifugal space therein, a chamber having an inlet and an outlet of the sludge, a rotating body installed in the centrifugal space of the chamber, and a motor for providing rotational force to the rotating body. And a rotation part for generating centrifugal force, and a circulation part for circulating air into and out of the chamber.

Here, the chamber is provided with a vent for discharging mist and vapor in the centrifugal space, and a water discharge port through which water separated from the sludge is discharged. The centrifugal space of the chamber is the rotating body. It is preferable to maintain a temperature of 100 ° C. or less by the heat generated by the rotational movement of. In addition, the circulation unit includes a circulation fan for generating a circulation force, and an inlet pipe and an outlet pipe of air connecting the circulation fan and the chamber, wherein the discharge pipe is preferably connected to the outlet of the sludge. At this time, the discharge pipe is preferably installed is connected to the classifier for classifying the sludge discharged from the chamber.

On the other hand, according to another embodiment of the present invention, the drying grinder, the drying chamber is provided with a centrifugal space therein, and the inlet and outlet of the sludge, and injecting air to generate the centrifugal air flow into the inlet of the drying chamber By including an air injection unit, the sludge is pulverized and dried while rotating the sludge along the centrifugal air flow generated inside the drying chamber. Drying grinder having such a drying chamber may be provided before or after the drying grinder according to an embodiment on the basis of the movement direction of the sludge.

According to the present invention having the configuration as described above, first, as the dehydrated sludge is further dried and pulverized into a sludge coal, it is possible to energize the organic sludge. As a result, it is possible to suppress the environmental pollution caused by the ocean dumping of sludge, which has been widely used, and produce alternative energy.

Second, as the sludge is dewatered by the electropenetrating dehydration method, it is possible to provide a sludge having a low moisture content that is difficult to be dehydrated by mechanical dehydration or air drying. Accordingly, the sludge pulverization by the centrifugal force of the sludge coal production unit becomes easier.

Third, by providing the sludge having a low water content to the sludge coal production unit, it is possible to suppress the occurrence of problems such as sludge sticking to the rotating body to hinder rotation.

Fourth, as the sludge is dried at the same time as the crushed by the heat generated by the rotation of the rotating body, it is possible to expect a high drying efficiency even with a small drying energy.

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

Referring to FIG. 1, the sludge treatment apparatus 1 according to an exemplary embodiment of the present invention includes a dewatering unit 10 and a sludge coal production unit 20.

The dehydration unit 10 dehydrates the sludge S (see FIGS. 2 and 3). Here, the sludge (S) is a sediment of wastewater containing organic sludge particles such as sewage or wastewater, and has a water content of approximately 99 wt%. Accordingly, the sludge treatment apparatus 1 described in the present invention is employed in the wastewater treatment facility, but is not necessarily limited thereto.

The dewatering unit 10 dehydrates the sludge S in multiple stages. To this end, in this embodiment, the dehydration unit 10 is illustrated as including the first and second dehydrator 11, 12 for sequentially dewatering the sludge (S). However, it is obvious that the dehydration unit 10 includes the first and second dehydrators 11 and 12, but is not limited to the illustrated example.

The first dehydrator 11 dewaters the sludge S to a water content of approximately 85 wt%. The first dehydrator 11 may be any one of various dehydration methods such as vacuum filtration, filter press, and belt press. In this embodiment, it is illustrated that the belt press dewatering method capable of continuously operating the first dehydrator 11 and processing a large amount of sludge S is adopted. For reference, the belt press dewatering method employed in the first dehydrator 11 can be understood from a known technology, so detailed description and illustration are omitted.

The second dehydrator 12 dewaters the sludge S discharged from the first dehydrator 11 to a water content of about 65 wt% or less. In this embodiment, as shown in FIG. 2, the second dehydrator 12 dehydrates the sludge S secondly by an electropenetrating dehydration method to dewater up to a water content of 60 wt%.

Referring to FIG. 2, the second dehydrator 12 by the electropenetrating dehydration method includes a drum 13, a caterpillar 14, a moving belt 16, and a power applying unit 18.

The drum 13 rotates at a constant speed, and although not shown in detail, coolant is introduced into and discharged from the inside. The caterpillar 14 is rotated to face some outer circumferential surface of the drum 13. In addition, the moving belt 16 is a filter belt for flowing sludge S between the drum 13 and the caterpillar 14 by traveling between the drum 13 and the caterpillar 14 in an infinite track. . That is, the sludge S is introduced into the overlapping region where the drum 13 and the caterpillar 14 face each other and is discharged along the rotational movement of the moving belt 16. At this time, the caterpillar 14 and the movable belt 16 is guided by the first and second guide rollers 15 and 17, respectively.

The power applying unit 18 applies different polarities to the drum 13 and the caterpillar 14, and in this embodiment, the positive electrode (+) and the negative electrode (-) are applied. However, the present invention is not necessarily limited thereto, and the power supply unit 18 may be modified to apply the negative electrode (−) and the positive electrode (+) to the drum 13 and the caterpillar 14, respectively.

The second dehydrator 12 having the configuration as described above is applied to the drum 13 and the caterpillar 14 by the power applying unit 18, respectively, as the positive electrode (+) and the negative electrode (−) are applied to the sludge ( The sludge particles of S are moved to the side of the drum 13 to which the positive electrode (+) is applied due to their negative (-) properties, and the moisture contained in the sludge (S) is negatively affected by the positive (+) property. ) Is moved toward the side of the caterpillar 14 to which the water is applied, whereby water is dehydrated from the sludge S. At this time, the sludge (S) is moved to the caterpillar (14), even the moisture bound to the sludge (S) by the electroosmotic phenomenon is dehydrated, it is difficult to dehydrate by the method of mechanical dehydration or air dry Even dehydrated water is removed. In conclusion, the second dehydrator 12 moves the sludge by electrophoresis and moves the water separated by the electroosmotic phenomenon, that is, the desorption liquid, to separate and dehydrate the water from the sludge S.

The sludge coal production unit 20 manufactures sludge coal dehydrated in multiple stages through the dehydration unit 10 to make energy from sludge coal. To this end, the sludge coal production unit 20 is dried and pulverized the dewatered sludge (S), and then formed into sludge coal to energy. The sludge coal production unit 20 includes a dry grinder 30 and a molding machine 50.

The dry crusher 30 dehydrates / drys the dewatered sludge S, and grinds to a particle size that can be formed into sludge coal. Here, the dry crusher 30 dehydrates / drys the sludge S to about 30 wt% or less, for example, a water content of 30 to 10 wt%, and grinds to a size of 3 mm or less. The dry grinding machine 30 includes a chamber 31, a rotating part 38 and a circulation part 42.

The chamber 31 is provided with a centrifugal space 32 therein, and has an inlet 33 and an outlet 34 through which the sludge S is introduced and discharged. Here, the inlet 33 and the outlet 34 are formed through the upper surface of the chamber 31. In addition, the chamber 31 has an air vent 35 formed through an upper surface to discharge mist and vapor in the centrifugal space 32, and water W separated from the sludge S. The water discharge port 3336 formed by penetrating the lower surface of the chamber 31 to be discharged is provided.

The rotating unit 38 is connected to the rotating body 39 installed in the centrifugal space 32 of the chamber 31 and the shaft 40 of the rotating body 39 to provide a rotational force (41) Include. As shown in FIG. 4, the rotating part 38 generates centrifugal force that allows the sludge S introduced into the centrifugal space 32 to be rotated at high speed, thereby absorbing water W from the particle surface of the sludge S. Separation and drying the sludge (S) by generating heat by the rotational force. At this time, the centrifugal space 32 inside the chamber 31 maintains a temperature of about 100 ° C. or less due to heat generated by the rotational force of the rotating part 38.

For reference, as the sludge S is compressed by the rotating body 39 and the inner wall and the internal structure of the chamber 31 by the rotational force of the rotating part 38, moisture is separated. In addition, the sludge S is pulverized by the rotation of the rotor 39.

The circulation part 42 circulates air A into and out of the chamber 31. The circulation part 42 is an inlet pipe providing a circulation fan 43 for generating a circulation force and a flow path for connecting the circulation fan 43 and the chamber 31 to introduce and discharge the air A. FIG. And a discharge pipe 45. Here, the inlet pipe 44 is connected to a separate air inlet 37 formed to penetrate the chamber 31, the discharge pipe 45 is an outlet 34 through which the sludge (S) of the chamber 31 is discharged. ). By such a configuration, the air introduced through the air inlet 37 through the inlet pipe 44 is converted into an airflow which is rotated at high speed by the rotational force of the rotating unit 38, and the centrifugal space 32 shown in FIG. As it forms the same centrifugal air flow (V), it is discharged through the discharge pipe (45) through the discharge port (34). At this time, the sludge S discharged to the outside of the chamber 31 through the discharge hole 34 and the discharge pipe 45 is classified and discharged by the classifier 46.

The molding machine 50 presses or compresses the sludge S, which is pulverized into fine particles, through the dry crusher 30 to form an energy-efficient sludge coal. Since the molding technique of such a molding machine 50 can be understood from a known technique, detailed description and illustration are omitted.

The sludge treatment method of the sludge treatment apparatus 1 according to the present invention having the above configuration will be described below with reference to FIGS. 1 to 4.

First, when the sludge S having a water content of approximately 99 wt% is discharged from a digester of a wastewater treatment facility, such as a sewage treatment facility or a wastewater treatment facility, the first and second parts of the dewatering unit 10 are discharged as shown in FIG. 1. The dehydrator (11) (12) is sequentially dewatered up to approximately 85wt% and 60wt%. At this time, the first dehydrator 11 is a belt press dehydration method is adopted, the second dehydrator 12 as shown in Figure 2 the moving belt 16 between the drum 13 and the caterpillar 14 sludge. An electropenetrating dehydration method is adopted to dewater the sludge (S) due to the difference in polarity by introducing it.

The sludge S dehydrated in the second step is introduced into the dry crusher 30 of the sludge coal production unit 20. Specifically, as shown in FIG. 3, when the dewatered sludge S is introduced through the inlet 33 of the chamber 31, the rotor 39 rotates at a high speed by the rotational force of the motor 41. On the centrifugal space 32 inside the chamber 31, a centrifugal air flow V as shown in FIG. 4 is formed. At this time, in order to form the high speed rotary air stream, the circulation fan 43 and the circulation fan 43 and the chamber 31 of the circulation part 42 through the inlet pipe 44 and the discharge pipe 45 interconnected to each other. Air A is forcedly circulated into and out of the chamber 31. At this time, the air inlet 37 of the chamber 31 connected to the inlet pipe 44 is provided on the side of the chamber 31, the outlet 34 connected to the discharge pipe 45 is formed on the upper surface of the chamber 31. As a result, the centrifugal air flow V formed by the rotational force of the rotating body 39 that rotates in the lower portion of the chamber 31 has a shape that moves upward from the lower portion of the chamber 31.

By the centrifugal air flow V formed in the chamber 31 as described above, the sludge S is pulverized and dehydrated simultaneously by the centrifugal force and the compressive force, and dried by the heat generated by the rotation of the rotor 39. At this time, the temperature in the chamber 31 is maintained below 100 ° C by dehydration of the sludge S and condensation of steam. When the dried and pulverized sludge S is dehydrated to a target water content of 30 wt% or less and pulverized to a target particle size, the sludge S is discharged through the outlet 34 and the discharge pipe 45. In addition, the discharged sludge S is classified through the classifier 46 and moved to the molding machine 50, and is formed into sludge coal by the molding machine 50.

On the other hand, referring to Figure 5, another embodiment of the above-described dry grinding machine is shown. The dry grinding machine 130 shown in FIG. 5 is provided with a centrifugal space 132 therein and includes a drying chamber 131 having an inlet 133 and an outlet 134 of the sludge S. At this time, although the inlet 133 of the drying chamber 131 is not shown in detail, it is connected to an air injection unit (not shown) for injecting the compressed air (A), the air (A) is introduced.

As such, the air A introduced together with the sludge S through the inlet 133 generates centrifugal air flow V inside the drying chamber 131, so that the sludge S is centrifugal air flow V. It is ground and dried while rotating along. That is, unlike the dry crusher 30 having the rotating body 39 which generates the centrifugal air V shown in FIGS. 3 and 4 and mechanically crushes the sludge S, the centrifugal air V Only the sludge S is ground and dried. At this time, the drying chamber 131 is also provided with a water outlet 136, to discharge the water (W) generated during drying to the outside of the drying chamber 131. In the dry grinding machine 130 according to another embodiment, the sludge S is dehydrated by the dehydration unit 10 to have a water content of 65 wt% or less, and thus, the air may be pulverized and dried by air injection alone without mechanical grinding. .

For reference, the dry mill 130 according to another embodiment of the present invention may be provided together with the dry mill 30 according to the above-described embodiment. That is, the drying grinders 30 and 130 according to the above and other embodiments are provided at the same time, and the dehydrated sludge S may be dried in two stages. In this case, the drying grinder 130 according to another embodiment described above is installed before or after the drying grinder 30 according to one embodiment based on the moving direction of the sludge S.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a configuration diagram schematically showing a sludge treatment apparatus according to an embodiment of the present invention,

2 is a cross-sectional view schematically showing a second dehydrator shown in FIG.

Figure 3 is a perspective view schematically showing a dry grinding machine shown in FIG.

4 is a cross-sectional view of a chamber for explaining a state where a centrifugal air flow is formed;

5 is a cross-sectional view schematically showing a dry grinding machine according to a modified embodiment.

Description of the Related Art [0002]

1: sludge treatment device 10: dewatering unit

11: first dehydrator 12: second dehydrator

20: sludge coal production unit 30, 130: dry mill

50: molding machine

Claims (13)

In the sludge treatment apparatus for treating the organic sludge to energize, Dewatering unit for dewatering the sludge; And A sludge coal production unit for drying and dehydrating the dewatered sludge by centrifugal force to make the sludge coal into energy; / RTI > The sludge coal production unit, A dry mill for drying and pulverizing the dewatered sludge using a centrifugal stream; And A molding machine for molding the crushed sludge into the sludge coal; Including; The dry grinding machine, A chamber having a centrifugal space therein and having an inlet and an outlet of the sludge; A rotating part installed in the centrifugal space of the chamber to generate the centrifugal force and to generate the centrifugal force, including a rotating body for crushing the sludge and a motor providing a rotating force to the rotating body; And A circulation unit circulating air in and out of the chamber; Including, The circulation portion, A circulation fan generating a circulation force; And An inlet and outlet tube of air connecting the circulation fan and the chamber; Including; The inlet pipe is connected to the air inlet through the chamber, the discharge pipe is sludge treatment apparatus, characterized in that connected to the outlet of the sludge. The method of claim 1, The dewatering unit is provided with a plurality of dehydrator to dewater the sludge in multiple stages, At least one of the dehydrator of the plurality of dehydrators, the electro-osmotic dehydration method is adopted to dewater the sludge by electrophoresis and electroosmotic action by supplying the sludge between the drum and the caterpillar to which different electrodes are applied. Sludge treatment equipment. The method of claim 1, The dewatering unit, It includes a first and second dehydrator for sequentially dewatering the sludge, The second dehydrator includes a drum, a caterpillar rotated along at least a portion of an outer circumferential surface of the drum, a moving belt for moving the sludge to the drum and the caterpillar, and a power applying unit for applying different polarities to the drum and the caterpillar, respectively. Sludge treatment apparatus, characterized in that. delete delete delete The method of claim 1, The chamber is characterized in that the sludge treatment apparatus is provided with a vent for discharging the mist (MIst) and the vapor (Vapor) in the centrifugal space, and a water outlet for discharging the water separated from the sludge. The method of claim 1, And the centrifugal space of the chamber is maintained at a temperature of 100 ° C. or less by heat generated by the rotational movement of the rotating body. The method of claim 1, And a classifier for classifying the sludge discharged from the chamber by being connected with the discharge pipe. delete The method according to any one of claims 7 to 9, The sludge coal production unit, A drying chamber disposed before or after the drying mill based on the direction of movement of the sludge and having a centrifugal space therein and having an inlet and an outlet of the sludge, and air for generating centrifugal air flow into the inlet of the drying chamber. Sludge treatment apparatus further comprises a sub-drying mill for pulverizing and drying the sludge only by centrifugal air, including an air injection unit for injecting a. delete delete

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