KR102325554B1 - Wastewater treatment sludge recycling device and wastewater treatment sludge recycling method using the same - Google Patents

Abstract

The present invention relates to a wastewater treatment sludge recycling device and a wastewater treatment sludge recycling method using the same, and more specifically, to a wastewater treatment sludge recycling device and a wastewater treatment sludge recycling method using the same, wherein wastewater treatment sludge is carbonized to recover and recycle carbide or iron oxide contained in the carbide, air pollution caused by exhaust gas generated during carbonization can be thoroughly prevented, and the device has a compact structure to reduce installation costs or operating costs.

Description

Wastewater treatment sludge recycling device and wastewater treatment sludge recycling method using same

The present invention relates to a wastewater treatment sludge recycling device and a wastewater treatment sludge recycling method using the same, and more particularly, to carbonization of wastewater treatment sludge to recover and recycle carbides or iron oxide contained in carbides, but exhaust gas generated during carbonization To a wastewater treatment sludge recycling device and a wastewater treatment sludge recycling method using the same, which can thoroughly prevent air pollution caused by air pollution, and have a compact structure to reduce installation and operating costs.

Industrial wastewater is generated along with various industrial activities and contains harmful substances such as toxic organic matter and heavy metals in addition to general pollutants such as organic matter, suspended matter, nitrogen and phosphorus of domestic sewage. In addition, since the quality and quantity of wastewater are different depending on the industry, process, and operation method, the quality of the discharged wastewater is different even for manufacturers that produce the same type of product. Most industrial wastewater contains these difficult-to-decompose substances and toxic substances, making it difficult to effectively treat them and have problems in operation management.

Among the prior art, Korean Patent No. 10-2002-0001077 proposes a method of simultaneously removing COD and chromaticity using a mixture of a magnesium salt and an iron salt in dyeing wastewater containing most of the dyes. The existing method using ferric polysulfate has a disadvantage of using excessive sulfuric acid because the pH must be lowered for coagulation. It can be maintained, and the two coagulants complement each other, which has the advantage of simultaneously decolorizing and removing COD. However, in the prior art, efficient coagulation is possible without pH adjustment, but there is a problem in that two kinds of coagulants are input.

Korean Patent No. 10-2002-0021088 proposes a method of removing COD and chromaticity of colored wastewater and alkaline wastewater using an inorganic coagulant for water treatment. The prior art exhibits superior wastewater treatment ability compared to the existing coagulant, has an effect of removing COD and color as well as total phosphorus, total nitrogen, suspended solids, and turbidity, and has economic feasibility through improvement of water treatment cost.

Efforts have been made for efficient coagulation treatment of industrial wastewater in various methods as described above. However, development of a technology for reducing environmental pollution by coagulating industrial wastewater using industrial by-products, particularly carbides generated in the sludge carbonization process, is insufficient.

Currently, in the case of sewage sludge and organic sludge, it is difficult to treat and dispose of organic sludge in accordance with various stricter laws. Accordingly, studies on treatment and disposal issues through efficient recycling of sludge are in progress.

On the other hand, Republic of Korea Patent No. 10-1206856 discloses a) a by-product generated in the carbonization process of organic sludge containing iron (Fe) component generated in sewage sludge or dyeing and leather industry in wastewater to be treated. adding carbide as a flocculant; and b) rapidly stirring the wastewater to which the coagulant has been added at 200 to 300 rpm for 1 to 3 minutes, followed by slow stirring at 30 to 70 rpm for 8 to 15 minutes. .

However, as a result of using the carbide obtained by the method of the above-mentioned registered patent as a coagulant, cohesive performance is not exhibited, so it is not used in the field. In general, the coagulant is divided into a liquid phase and a solid phase. In the case of a solid phase such as the carbide, it should be used by dissolving it in water.

Therefore, there is a need for further research on how to carbonize and recycle wastewater treated sludge containing iron oxide.

Republic of Korea Patent No. 10-1206856

The present invention has been devised to solve the problems of the prior art, and an object of the present invention is to recover and recycle carbide or iron oxide contained in carbide by carbonizing wastewater treatment sludge, but air pollution caused by exhaust gas generated during carbonization It is to provide a wastewater treatment sludge recycling device and a wastewater treatment sludge recycling method using the same, which can prevent the sludge from being completely discharged and have a compact structure to reduce installation and operating costs.

The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a wastewater treatment sludge recycling apparatus according to the present invention includes a supply device for supplying wastewater treatment sludge;
and a carbonization device for carbonizing the wastewater treatment sludge supplied from the supply device;
The carbonization device,
a body comprising an upper body portion, a lower body portion, and a cover portion; a transport means installed in the upper body part to transport, dry and carbonize the wastewater treatment sludge; a driving means for driving the conveying means; a main burner supplying heat into the upper body part; Including; a sub-burner for supplying heat to the inside of the lower body part;
The transport means,
A first transfer module composed of five first screws spaced up and down from the first row to the fifth row on one side based on an imaginary vertical line passing through the center of the upper body part, and the imaginary vertical line as a reference is disposed on the other side with a second transfer module composed of five second screws arranged from the first row to the fifth row at positions corresponding to the first screws, and the first screw and the second screw are installed horizontally through the front and rear surfaces of the upper body,
The wastewater treatment sludge supplied from the supply device is distributed and supplied to the first screw and the second screw through a distribution port installed in the cover, respectively,
The first screw and the second screw disposed in the first row are located closer to an imaginary vertical line passing through the center of the upper body portion than the first screw and the second screw disposed in the second row,
The first screw and the second screw disposed in the third row are positioned on the same line as the first screw and the second screw disposed in the first row,
The first screw and the second screw disposed in the fourth and fifth rows are positioned on the same line as the first screw and the second screw disposed in the second row,
The first screw and the second screw disposed in the fifth row have a structure protruding forward,
The wastewater treated sludge is dried and carbonized while sequentially passing through the first and second screws of the first to fifth rows, and the carbide of the wastewater treated sludge is produced through the first and second screws of the fifth row. discharged to the outside of the body,
An external discharging screw is connected to the portion protruding to the outside of the first and second screws of the fifth row, and the external discharging screw cools the carbide while passing through the cooling water tank,
The driving means is
a driving motor installed in front of the upper surface of the cover;
a drive sprocket provided in the drive motor;
a front sprocket or a rear sprocket respectively installed at the front end or rear end of the first screw and the second screw;
a front chain sequentially connecting the drive sprockets, the front sprockets of the first screws arranged in the first to third rows, and the front sprockets of the second screws arranged in the third to the first rows;
It is composed of a rear chain that sequentially connects the rear sprockets of the first screws arranged in the third to fifth rows and the rear sprockets of the second screws arranged in the fifth to the third rows. When the driving motor rotates, the front It is characterized in that the first screws and the second screws are integrally driven while the chain and the rear chain rotate in conjunction with each other.

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In addition, in the wastewater treatment sludge recycling apparatus according to the present invention, the upper body part and the lower body part are partitioned by a partition wall and an opening is provided on the side of the second transfer module, and the sub-burner is disposed directly below the opening. The exhaust gas generated from the upper body part moves to the lower body part through the opening and at the same time is heat-treated by high heat of 900 to 1,000°C supplied from the sub-burner, and then the exhaust gas provided on one side of the lower body part It is characterized in that it is discharged to the outside through the flue.

In addition, the wastewater treatment sludge recycling method according to the present invention is a wastewater treatment sludge recycling method using a wastewater treatment sludge recycling device, the method comprising: supplying the wastewater treatment sludge containing iron oxide to the main body through the supply device; drying and carbonizing sequentially while the wastewater treatment sludge is transported for a predetermined time through a transport means while maintaining the temperature inside the body at 400 to 500°C; and discharging the carbide of the wastewater treatment sludge to the outside of the body and cooling it, then separating the iron oxide contained in the carbide and molding the carbide into a pellet form.

According to the wastewater treatment sludge recycling apparatus and the wastewater treatment sludge recycling method using the same according to the present invention, the wastewater treatment sludge is carbonized to recover carbide or iron oxide contained in the carbide for recycling, but air pollution caused by exhaust gas generated during carbonization It is contained in wastewater treatment sludge, which can prevent thoroughly and also reduce installation and operating costs due to its compact structure.

Effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a side view of a wastewater treatment sludge recycling apparatus according to the present invention.
Figure 2 is a front view of the wastewater treatment sludge recycling apparatus according to the present invention.
3 is a rear view of the wastewater treatment sludge recycling apparatus according to the present invention.
4 is a perspective view of a wastewater treatment sludge recycling apparatus according to the present invention.
5 is a longitudinal cross-sectional view schematically showing the screw arrangement structure installed in the main body of the present invention.
6 is a longitudinal cross-sectional view showing the internal structure of the main body of the present invention.
7a and 7b are photographs taken of the wastewater treatment sludge recycling apparatus according to the present invention.
8A and 8B are a photograph of iron oxide recovered according to the wastewater treatment sludge recycling method according to the present invention, and a photograph of iron oxide attached to a magnet.

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

In describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or precedents of users and operators. Therefore, the definition should be made based on the content throughout this specification.

1 is a side view of the wastewater treatment sludge recycling apparatus according to the present invention, FIG. 2 is a front view of the wastewater treatment sludge recycling apparatus according to the present invention, and FIG. 3 is a rear view of the wastewater treatment sludge recycling apparatus according to the present invention. And Figure 4 is a perspective view of a wastewater treatment sludge recycling apparatus according to the present invention, Figure 5 is a longitudinal cross-sectional view schematically showing the screw arrangement structure installed in the main body of the present invention, Figure 6 is a body internal structure of the present invention is a longitudinal section.

1 to 6 , the wastewater treatment sludge recycling apparatus 100 according to the present invention includes a supply device 110 for supplying wastewater treatment sludge, and carbonization for carbonizing the wastewater treatment sludge supplied from the supply device 110 . The device 120 may include a cooling water tank 175 and an exhaust gas flue 180 .

The supply device 110 of the present invention includes a hopper 111 for receiving wastewater treatment sludge, and a screw 113 for supplying raw materials for supplying the wastewater treatment sludge accommodated in the hopper 111 to the carbonization device 120 . do.

The carbonization apparatus 120 of the present invention includes a main body 121 including an upper body part 122, a lower body part 124, and a cover part 126, and is installed in the upper body part 122 and said A transport means for transporting, drying and carbonizing wastewater treatment sludge, a driving means for driving the transport means, a main burner 160 for supplying heat into the upper body part 122 , and the lower body part 124 . ) may be configured to include a sub-burner 165 for supplying heat to the inside.

A driving motor 151 is installed in front of the cover part 126 , and a distribution hole 127 is installed in the rear side, and the distribution hole 127 is coupled to the upper end of the screw 113 for supplying the raw material.

The upper body part 122 is equipped with a conveying means and a main burner 160 to dry and carbonize the wastewater treatment sludge while moving, and has an anaerobic atmosphere in which oxygen is not supplied.

The transfer means is a first comprising a plurality of first screws (130a ~ 130e) arranged to be vertically spaced apart on one side based on an imaginary vertical line (A) passing through the center of the upper body portion (122) The transfer module 130 and a plurality of second screws 140a to 140e disposed on the other side based on the virtual vertical line A and disposed at positions corresponding to the first screws 130a to 130e. The second transfer module 140 is configured.

The first transfer module 130 and the second transfer module 140 receive and transfer wastewater treatment sludge through the distribution port 127, respectively, and are mounted on the upper body part 122 in a parallel manner.

The first screws 130a to 130e and the second screws 140a to 140e are installed to horizontally penetrate the front and rear surfaces of the upper body 122, respectively.

The plurality of first screws 130a to 130e are connected in series while being spaced apart vertically, and similarly, the plurality of second screws 140a to 140e are also connected in series while being spaced apart vertically.

The first transfer module 130 and the second transfer module 140 are respectively composed of first screws 130a to 130e and second screws 140a to 140e in the first to fifth rows from the top to the bottom.

That is, the first transfer module 130 includes five first screws 130a to 130e, and the second transfer module 140 includes five second screws 140a to 140e.

The first screw 130a and the second screw 140a disposed in the first row are located closer to the virtual vertical line A than the first screw 130b and the second screw 140b disposed in the second row as a reference, The first screws 130c and the second screws 140c arranged in the third row are positioned on the same line as the first screws 130a and the second screws 140a arranged in the first row, and the fourth and fifth rows The first screws 130d and 130e and the second screws 140d and 140e arranged in the rows are positioned on the same line as the first screws 130b and the second screws 140b arranged in the second row.

The first screws and the second screws of the first transfer module and the second transfer module are arranged in a zigzag structure from rows 1 to 4 and are symmetrical based on an imaginary vertical line, which means that the first screw in each row has a row This is to ensure uniform supply and, above all, to suit the chain connection structure of the driving means to be described later.

And, for example, the first screw disposed in the first row receives the wastewater treatment sludge through the distribution port and transports it toward the front of the upper body, and then supplies the wastewater treatment sludge to the first screw disposed in the second row below it. And the first screw arranged in the second row transports the wastewater treatment sludge toward the rear of the upper body part, and then supplies the wastewater treatment sludge to the first screw arranged in the third row below it, and in the fourth and fifth rows, the wastewater transport the treated sludge.

The wastewater treatment sludge is dried and carbonized while being transported in a zigzag manner through the first screw in rows 1 to 5.

As described above, in the present invention, two transfer modules are installed in the main body in parallel, each transfer module is arranged in a symmetrical structure to the left and right, and the screw of each transfer module transfers wastewater treatment sludge in a zigzag structure. It can have a screw arrangement structure and is efficient in terms of installation space utilization.

Meanwhile, the first screws 130e and the second screws 140e arranged in the fifth row have a structure protruding forward.

The wastewater treated sludge is dried and carbonized while sequentially passing through the first and second screws of the first to fifth rows, and the carbide of the wastewater treated sludge is produced through the first and second screws of the fifth row. discharged to the outside of the body.

More specifically, it may be exemplified that the time required for the wastewater treatment sludge to be discharged through all of the first and second screws in the first to fifth rows is 40 to 50 minutes. And the feed speed of each screw is the same.

Since the wastewater treatment sludge supplied from the hopper or the screw for raw material supply contains moisture, the wastewater treatment sludge is dried in the first and second screws in the first to second rows, and the wastewater treatment sludge is dried in the third to fifth rows. A substantial carbonization process takes place during the transfer from the first screw and the second screw. Since the connection portion of the screws in each row is not sealed, for example, moisture evaporated from the first screw and the second screw in the first row and the second row is discharged to the inner space of the upper body through the connection part, and the third row to Dust or exhaust gases generated during carbonization in the first and second screws of the fifth row are also discharged into the inner space of the upper body through the connection part.

An external discharging screw 170 is connected to the portion protruding to the outside of the first screw and the second screw in the fifth row.

The screw 170 for external discharge is disposed to pass through the cooling water tank 175, and the carbonized carbide of wastewater treatment sludge is cooled while passing through the cooling water tank.

The driving means of the present invention includes a driving motor 151 installed in front of the upper surface of the cover part 126, a driving sprocket 152 provided in the driving motor 151, the first screws 130a to 130e, and The front sprocket 153 or the rear sprocket 155 respectively installed at the front or rear ends of the second screws 140a to 140e, the driving sprocket 152, and the first screws 130a to arranged in the first to third rows 130c) and the front chain 157 sequentially connecting the front sprockets 153 of the second screws 140c to 140a arranged in the third to first rows, and the third to fifth rows A rear chain 159 sequentially connecting the rear sprockets 155 of the first screws 130c to 130e arranged in a row and the rear sprockets 155 of the second screws 140e to 140c arranged in the fifth to third rows ) is composed of

When the drive motor rotates, each screw operates at the same speed because the first and second screws are integrally driven while the front chain and the rear chain rotate in conjunction with each other, and a total of 10 screws can be operated with only one drive motor. Because it is driven, there is an advantage that the installation cost can be greatly reduced.

The present invention arranges the lower body part under the upper body part where carbonization is performed in order to purify the odor generated in the carbonization process of wastewater treatment sludge and exhaust gas containing various organic compounds, and generated through a sub-burner installed in the lower body part. Heat treatment of exhaust gas, etc. with high heat.

To this end, the upper body part 122 and the lower body part 124 are partitioned by a partition wall 123 , and an opening 123a is provided on the second transfer module 140 side, and the sub-burner 165 is formed. ) is disposed directly below the opening 123a.

The exhaust gas generated from the upper body part moves to the lower body part through the opening and at the same time is heat-treated by high heat of 400 to 500°C supplied from the sub-burner. The exhaust gas purified by the suction fan 181 provided on one side of the lower body part is sucked and discharged from the exhaust gas flue to the outside.

Hereinafter, the wastewater treatment sludge recycling method of the present invention will be described.

The wastewater treatment sludge recycling method of the present invention comprises the steps of supplying the wastewater treatment sludge containing iron oxide to the main body through the supply device, and treating the wastewater through a transfer means while maintaining the temperature inside the main body at 400 to 500 ° C. A step of sequentially drying and carbonizing while the sludge is transported for a predetermined time, and discharging the carbide of the wastewater treatment sludge to the outside of the body and cooling it, then separating the iron oxide contained in the carbide and forming it in a pellet form is made including

The wastewater treatment sludge containing iron oxide can be exemplified by pulp sludge or sludge generated from a dyeing plant, and these sludges contain a large amount of iron oxide due to the input of a coagulant containing iron oxide. Therefore, iron oxide can be recovered and recycled through the above-described carbonization process. In addition, the iron oxide formed in the form of pellets is used as a raw material for iron making in iron mills.

In the present invention, as shown in FIGS. 6A to 6B, a wastewater treatment sludge recycling device was installed, and drying and carbonization were performed for 45 minutes while the temperature inside the upper body was maintained at 450°C, as shown in FIG. A carbide was obtained, and it was confirmed that the weight of iron oxide in the total weight of the carbide was 37-52%. At the same time, the exhaust gas was purified by heating to 900°C in the lower body part.

In this way, iron oxide can be recovered and recycled through the carbonization process, and exhaust gas generated during carbonization can be efficiently purified.

The present invention described above is merely exemplary, and those of ordinary skill in the art to which the present invention pertains will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, it will be well understood that the present invention is not limited to the form mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. Moreover, it is to be understood that the present invention covers all modifications, equivalents and substitutions falling within the spirit and scope of the invention as defined by the appended claims.

100: wastewater treatment sludge recycling device 110: supply device
111: hopper 113: screw for raw material supply
120: carbonization device 121: body
122: upper body part 123: partition wall
123a: opening 124: lower body portion
126: cover portion 127: distribution port
130: first transfer module 130a ~ 130e: first screw
140: second transfer module 140a ~ 140e: second screw
151: drive motor 152: drive sprocket
153: front sprocket 155: rear sprocket
157: front chain 159: rear chain
160: main burner 165: sub burner
170: screw for external discharge 175: cooling water tank
180: exhaust gas flue 181: intake fan

Claims (5)

a supply device for supplying wastewater treatment sludge;
and a carbonization device for carbonizing the wastewater treatment sludge supplied from the supply device;
The carbonization device,
a body comprising an upper body portion, a lower body portion, and a cover portion; a transport means installed in the upper body part to transport, dry and carbonize the wastewater treatment sludge; a driving means for driving the conveying means; a main burner supplying heat into the upper body part; Including; a sub-burner for supplying heat to the inside of the lower body part;
The transport means,
A first transfer module composed of five first screws spaced up and down from the first row to the fifth row on one side based on an imaginary vertical line passing through the center of the upper body part, and the imaginary vertical line as a reference is disposed on the other side with a second transfer module composed of five second screws from the first row to the fifth row at positions corresponding to the first screws, and the first and second screws are each It is installed horizontally through the front and rear surfaces of the upper body,
The wastewater treatment sludge supplied from the supply device is distributed and supplied to the first screw and the second screw through a distribution port installed in the cover, respectively,
The first screw and the second screw disposed in the first row are located closer to an imaginary vertical line passing through the center of the upper body portion than the first screw and the second screw disposed in the second row,
The first screw and the second screw disposed in the third row are positioned on the same line as the first screw and the second screw disposed in the first row,
The first screw and the second screw disposed in the fourth and fifth rows are positioned on the same line as the first screw and the second screw disposed in the second row,
The first screw and the second screw disposed in the fifth row have a structure protruding forward,
The wastewater treated sludge is dried and carbonized while sequentially passing through the first and second screws of the first to fifth rows, and the carbide of the wastewater treated sludge is produced through the first and second screws of the fifth row. discharged to the outside of the body,
An external discharging screw is connected to the portion protruding to the outside of the first and second screws of the fifth row, and the external discharging screw cools the carbide while passing through the cooling water tank,
The driving means is
a driving motor installed in front of the upper surface of the cover;
a drive sprocket provided in the drive motor;
a front sprocket or a rear sprocket respectively installed at the front end or rear end of the first screw and the second screw;
a front chain sequentially connecting the drive sprockets, the front sprockets of the first screws arranged in the first to third rows, and the front sprockets of the second screws arranged in the third to the first rows;
It is composed of a rear chain that sequentially connects the rear sprockets of the first screw arranged in the third to fifth rows and the rear sprockets of the second screws arranged in the fifth to the third rows,
When the driving motor rotates, the front chain and the rear chain rotate in conjunction with each other to integrally drive the first screws and the second screws.
delete delete According to claim 1,
The upper body part and the lower body part are partitioned by a partition wall and an opening is provided on the side of the second transfer module,
The sub-burner is disposed directly below the opening,
The exhaust gas generated from the upper body part moves to the lower body part through the opening, and at the same time, it is heat-treated by high heat of 900 ~ 1,000 ℃ supplied from the sub burner, and then the exhaust gas flue provided on one side of the lower body part Wastewater treatment sludge recycling device, characterized in that it is discharged to the outside through the.
In the wastewater treatment sludge recycling method using the wastewater treatment sludge recycling device of claim 1 or 4,
supplying the wastewater treatment sludge containing iron oxide to the main body through the supply device;
drying and carbonizing sequentially while the wastewater treatment sludge is transported for a predetermined time through a transport means while maintaining the internal temperature of the body at 400 to 500°C;
discharging the carbide of the wastewater treatment sludge to the outside of the body and cooling it, then separating the iron oxide contained in the carbide and molding the carbide into a pellet form;
Wastewater treatment sludge recycling method comprising a.

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