KR101108483B1 - Fuel manufacturing method using sludge occurred from foul water, and a device using the same method - Google Patents

Abstract

The present invention is mixed with the sludges of fermented servings or livestock manure collected in the waste water tank, such as household waste, sewage sludge, wood waste, etc., crushed and dried and then mixed with wood and coal powder to produce a solid fuel to fuel the power plant and By supplying the fuel of the boiler, it is possible to produce electricity and hot water, so that wastewater treatment devices are installed in large apartments, regions, districts, and districts to supply electricity by itself. As described above, the present invention processes and recycles domestic waste and wastewater generated in its own area, and recycles it as power generation electric fuel, thereby reducing the cost of treating wastewater as well as supplying green energy, and at the same time, supplying environmentally friendly power generation fuel. In addition, the present invention relates to a fuel manufacturing apparatus using waste and wastewater sludge, which purifies water generated during wastewater treatment and secures waste water and insufficient water resources.

Wastewater, sludge, fuel, dryer, green energy, power generation fuel

Description

FUEL MANUFACTURING METHOD USING SLUDGE OCCURRED FROM FOUL WATER, AND A DEVICE USING THE SAME METHOD

The present invention collects the waste water in the tank to allow sludge to settle in the tank, while the water on the upper part of the sediment is discharged to the outside through a pipe installed in the tank for purification, and a dryer is inserted into the sludge in the tank to dehydrate and dry it. After drying, the sludge is mixed and pulverized with domestic waste, food waste and sludge generated from industrial sites, waste wood, and fallen leaves, and the solid fuel produced by mixing the mixed pulverized powder with coal powder is used as a cogeneration plant fuel. The present invention relates to a fuel manufacturing method and apparatus using wastewater sludge, which supplies green energy and simultaneously treats wastewater sludge with an environmentally friendly treatment method.

In the related art, since household waste and waste water are disposed of separately, many treatment costs such as landfill are generated to treat them, and there is a problem of causing environmental pollution. In particular, livestock waste and servings are treated in a separate septic tank as a waste treatment plant and then composted.They have to go through a number of processes, such as securing facility sites, enlarging landfill facilities, problems with operation and management, and environmental and soil pollution. There is a problem that occurs uneconomically generated.

In particular, livestock manure, phosphorus, copper powder, etc. can not be immediately fertilized, but after several months of fermentation and fermentation, it is not realized due to the cumbersome problem of using fertilizer to be processed, there is a problem that the purification process.

In addition, since food waste has a problem of removing salts, in the past, marine dumping was carried out along with industrial waste. However, since dumping of ocean dumping is legally prohibited, waste that cannot be recycled is buried or incinerated. However, this also causes soil pollution and air pollution, so there is a problem to pollute the environment.

The present invention has been made to solve the above problems, the method and apparatus for producing environmentally friendly green energy fuel by reprocessing household waste, sewage sludge and construction waste, construction and industrial waste, livestock manure, phosphorus, etc. generated at home Is to provide.

In addition, the present invention can be utilized in each field by producing electricity and hot water by supplying industrial or household fuel, and household waste such as sludge and wood, paper, synthetic resin, vinyl, construction waste, etc. The aim is to provide a method and apparatus that can reduce environmental pollution and reduce waste disposal costs by recycling food waste.

The present invention is to provide a wastewater treatment method and apparatus for purifying the wastewater of wastewater generated in apartments, apartments, and reunits to be recycled as waste water for toilets, and to secure insufficient water resources. It is.

According to the present invention, coal sludge, such as anthracite coal, is added to a mixed crushed product produced by drying and then crushing and mixing sludge generated from wastewater and wood, fallen leaves, paper, synthetic resin, vinyl, household waste such as construction waste, and food waste. It is an object of the present invention to provide a method and apparatus for producing a high calorific fuel by mixing at a ratio.

The fuel production method using the wastewater sludge of the present invention comprises the steps of: collecting the wastewater into a plurality of closed wastewater tanks sequentially; Depositing sludge in the wastewater tank collected by the collecting step and discharging the wastewater water out of the tank; Collecting methane gas generated by the fermentation of precipitated sludge through a gas discharge pipe installed in the lid of the tank; Opening a lid of the tank and putting a drier into the sludge to discharge water collected in the dryer to a wastewater tank after the wastewater is collected and dewatering the wastewater tank; Supplying power to the dryer after dehydration to dry the sludge; Supplying sludge dried by a dryer to a grinder to grind; Pulverizing household waste (paper, vinyl, wood, rubber, styrofoam, waste ascon, palm tree, etc.); Pulverizing the domestic waste and the dried food waste together in the crushing of the sludge to form a mixed sludge; A drying step of drying the mixed sludge through a tunnel drying furnace; Mixing 45 to 65% by weight of coal powder with 35 to 55% by weight of the dried sludge mixed powder; It is made by press molding to form a ball shot coal, a bullet shot, a briquette, and the like.

In the fuel manufacturing apparatus using the wastewater sludge of the present invention, the sludge of the collected wastewater is precipitated and the water is discharged to the next wastewater tank in which the wastewater is collected, and the plurality of wastewater sealed with a lid. Tank; A wastewater supply valve control member connected between the wastewater supply pipe and the wastewater supply line of the wastewater tank so that the wastewater is sequentially collected in the plurality of wastewater tanks; A dryer which is inserted into the sludge settled in the waste water tank to dewater and dry the sludge; And a purification treatment device for collecting and purifying the wastewater from which sludge discharged from the tank is removed.

The present invention not only recycles sludge generated from wastewater into solid fuel, but also purifies wastewater and recycles it into waste water, such as for toilet, secures insufficient water resources, and turns sludge into solid fuel to use electricity as electricity. By producing the fuel, it is effective to install environmentally friendly fuel by installing a fuel manufacturing device using wastewater sludge in each apartment, copper unit, li unit.

In addition, the present invention has the effect of preventing the ecological environmental pollution of rivers, rivers, seas etc. by purifying the remaining water except the sludge generated in the waste water waste water and reused as a waste water for toilets.

By purifying and reusing sludge separated sewage sludge, dam construction, site purchase, water pipe installation and operation and management costs can be added more than 50% of the current dam storage capacity and reduce the national budget of trillion won. .

In addition, it eliminates the causes of pollution of the four rivers caused by domestic sewage, thereby preventing sea pollution.

In addition, it is effective to maintain the beautiful mountain by preventing the destruction of the natural environment due to land depression caused by dam construction.

Hereinafter, the manufacturing method and apparatus of the present invention will be described with reference to FIGS. 1 to 9.

According to the present invention, sludge is collected when living sewage, sewage, livestock wastewater and industrial wastewater are collected in a tank for a predetermined period of time in a plurality of wastewater storage tags by a wastewater supply valve control member through a wastewater supply line. The sediment accumulated and accumulated in the waste water tank and filling the top of the waste water tank flows to the purification treatment apparatus through a drain pipe installed at the top of the tank for purification.

The discharge pipe and the purification treatment apparatus are connected to the discharge line so that the water filling up from the wastewater tank flows to the purification treatment apparatus through the drain pipe.

The water supplied to the purification treatment device through the discharge line is purified into second grade water by a series of purification treatments and reused as toilet or cleaning water, and the rest is discharged to rivers, rivers, and the sea.

Sewage, sewage, livestock waste, and industrial wastewater are collected into wastewater tanks (T1, T2, T3) through wastewater supply lines (1, 2, 3). It is supplied sequentially by the control of the member 7. To this end, the wastewater supply valve control member 7 is connected to the wastewater tanks T1, T2, T3 by supply pipes 4, 5, 6, and these supply pipes 4, 5, 6 are connected. The passage is opened or blocked by the wastewater supply valve control member 7.

The wastewater tank is composed of a plurality of sludge and water separated from the wastewater, and the sludge is fermented for a predetermined period to produce methane gas, and discharge pipes 13, 12; 13-1, 12- at the top of these tanks. 1; the water discharged through 13-2, 12-2 flows to the discharge line (L1). The wastewater tank is composed of a first wastewater tank T1, a second wastewater tank T2, a third wastewater tank T3, and the like, and the first to third wastewater tanks ( T1, T2, T3) has a plurality of discharge pipes (12, 13; 12-1, 13-1; 12-2, 13-2) at the top of the tank so that the waste water excluding the sludge is discharged out of the tank. ? Installed spaced down.

If the lower discharge pipe 12, 12-1, 12-2 of the discharge pipe (13, 12; 13-1, 12-1; 13-2, 12-2) spaced up and down is clogged, the upper discharge pipe (13, 13-1 and 13-2) discharge the wastewater out of the tank.

It is preferable that a filter (not shown) is provided in these discharge pipes 12, 13; 12-1, 13-1; 12-2, 13-2.

Waste water tanks (T1, T2, T3) is coupled to the lid 15 to open and close the tank body. Since the wastewater tanks T1, T2, and T3 have the same shape and structure, the wastewater tank T1 will be described, and the description of the remaining wastewater tanks T2 and T3 will be omitted.

The lid 15 has a flange 17 formed on the circumference thereof, and correspondingly, the flange 14 is formed on the tank main body T1 and is coupled to the mutual bolt 21. In addition, the lid 15 is provided with a pressure sensor and a level sensor (not shown) to detect the level of the sludge, and the gas discharge pipe (not shown) to discharge the methane gas generated from the sludge fermented for a predetermined period from the waste water tank. Connector 20 is installed.

In addition, an inlet 16 is formed in the lid 15 that seals the tank so as to be connected to a supply pipe 4 connected to the wastewater supply valve control member 7, and a supply pipe 4 is formed in the inlet 16. The connection is combined. Similarly, supply pipes 5 and 6 are connected to the inlets of the remaining caps 15-1 and 15-2, respectively.

A plurality of hooks 18 are provided to open and close the lid 15 from the wastewater tank body.

The lid 15 and the waste water tank body 11 are fastened by bolts 21, and the supply pipe 4 is also fastened by bolts 24 to the opening of the lid 15.

The drain pipe 22 is disposed at the lower part of the wastewater tank body 11 to drain the sludge after treatment, and the drain pipe 22 is provided with a valve 23 for opening and closing the pipe. . This drain pipe 22 is connected to the next wastewater tank where the wastewater is collected to allow sludge to settle. Here, the next wastewater tank where wastewater is collected refers to the next tank where the wastewater is collected when dehydration and drying occurs after the wastewater collection is completed.

The wastewater supply line (1,2) is connected between the wastewater supply line (1,2) and the supply pipes (4, 5, 6) of the wastewater tank to supply the wastewater to the tank body (11). The wastewater supply valve control member 7 is provided to control the wastewater to be supplied.

The wastewater supply valve control member 7 sequentially supplies the wastewater to the first to third wastewater tanks.

The wastewater supply valve control member 7 is transferred to the wastewater tanks T1, T2, and T3 in response to the set level detection signal of the sludge S from the level sensors provided in the respective tanks T1, T2, and T3. It is operated in such a way as to selectively block or open the passages of the connected feed pipes 4, 5, 6.

In the first wastewater tank T1, it is preferable that a valve V1 is installed between the wastewater water discharge pipes 12 and 13 installed in the tank body 11 and the discharge line L1. Similarly, the wastewater water discharge pipes 12-1, 13-2; 12-2, 13-2 and the discharge line L1 of the second wastewater tank T2 and the third wastewater tank T3. It is preferable that valves V2 and V3 are respectively provided between the two valves.

The dryer 30 inserted for dewatering and drying the sludge settled in the wastewater tank may be moved to the bottom of the wastewater tank as water is removed from the sludge by dehydration. At this time, it is preferable that the hook 32 of the upper part of the dryer is suspended and supported by a line or chain (not shown) so as to prevent the dryer 30 from falling down in the wastewater tank or lift it from the wastewater tank. More moisture may collect into the bottom of the dryer 30 that is inserted into the sludge.

When the wastewater is supplied to the first wastewater tank T1 of the present invention by the control operation of the wastewater supply valve control member 7, sludge precipitates and accumulates to a set level, and the upper water is discharged to the discharge pipe 12. , 13) is naturally discharged out of the tank and moved to the discharge line (L1). At this time, the sludge sedimentation is completed in the first wastewater tank (T1) usually takes 3 to 4 months. Therefore, the methane gas generated by the fermentation of the sludge accumulated in the first waste water tank (T1) is discharged through a gas discharge pipe (not shown) installed in the connecting portion 20 to the lid 15 to the methane gas storage (not shown) Is not collected).

The first wastewater tank T1 in which the wastewater is supplied and the sludge is accumulated therein is used to remove moisture from the sludge for a predetermined period of time when the wastewater is supplied to the second wastewater tank T2. The lid 15 of the tank T1 is opened.

It is preferable to perform a chemical treatment in advance to remove odor from the sludge S before opening and closing the lid 15 of the first waste water tank T1.

When the dryer 30 of the present invention is inserted into the sludge S of the first wastewater tank T1 having the lid 16 opened to be in contact with the bottom of the tank, the water contained in the sludge S forms a net of the dryer. Through the dryer 30 is collected inside. The water collected inside the dryer 30 is discharged and settled to the next wastewater tank in which wastewater is automatically collected through a pipe 32 connected to a separate pumping means, and the next wastewater tank is collected. Water discharged to the outside is preferably connected to the line (L1) for the purification treatment. The dewatering operation by the dryer 30 is performed for a long time, for example, over two months. And dehydration of the sludge (S) is made and then supplied power to the dryer 30 to dry the sludge. The drying operation of the dryer can also take place over a long period of time, for example over three months. Here, one dryer 30 is illustrated in the drawing, but a plurality of dryers may be inserted to dehydrate and dry the sludge.

To this end, the dryer 30 is composed of a cylindrical network structure narrower than the upper portion. The dryer 30 is composed of a ring-shaped upper frame 31 and a mesh suspended from the upper frame 31, and a plurality of electrode rods 33 are installed in the mesh so as to be spaced around the upper frame 31. do. The dryer 30 preferably has rigidity so that the network shape is maintained when the dryer 30 is pressurized to the sludge. In addition, the ring 32 is installed on the upper frame 31 to move the dryer (30). The size of the net is sufficient to prevent foreign matter less than 1mm from penetrating into the dryer.

Therefore, when the dryer 30 is inserted into the sludge, water passes through the dryer's network and the water accumulates in the dryer. This water is sent to a sewage waste tank where the next waste water is collected by a pumping device (not shown) and settled.

When water is not accumulated in the dryer due to dehydration from the sludge, the dryer 30 is heated by supplying power to the electrode 33 of the dryer. At this time, it is preferable that the hook 32 of the upper part of the dryer is suspended and supported by a line or chain (not shown) so as to prevent the dryer 30 from falling down in the wastewater tank or lift it from the wastewater tank.

As such, the drying operation of the sludge S, which is performed by dehydration and heating by the insertion of the dryer 30, is performed within a period in which the wastewater is stored in the second wastewater tank T2.

In this way, the wastewater is stored in the first wastewater tank T1 and the wastewater supply to the first wastewater tank T1 is controlled by the operation of the wastewater supply valve control member 7. Dewatering and drying of the sludge S precipitated in the first wastewater tank T1 is performed while the wastewater is supplied to and stored in the next second wastewater tank T2. Similarly, when the wastewater is stored in the second wastewater tank T2, the wastewater supply to the second wastewater tank T2 is cut off by the wastewater supply valve control member 7 and again. The wastewater is supplied to the next third wastewater tank T3.

Sedimentation of sludge in the second wastewater tank (T2) is completed in the same as the dewatering and drying period of the first wastewater tank (T1) 3 to 4 months, so as to the second wastewater tank (T2) Methane gas generated from the same is collected in the methane gas reservoir for the first three to four months as the first wastewater tank (T1). And while the wastewater is supplied to the third wastewater tank T3, the lid of the second wastewater tank T2 is opened and a drier 30 is introduced to dehydrate and dry the sludge S. ,

The period of injection into the primary wastewater tank T1, the secondary wastewater tank T2, and the tertiary wastewater tank T3 may vary depending on the wastewater tank capacity.

When the wastewater of the third wastewater tank T3 has been stored, the wastewater is supplied to the first wastewater tank T1 again, and the sludge dewatering and drying operations after the lid is opened. Likewise done. Of course, the methane gas generated in the third wastewater tank T3 during the three to four months when the wastewater is stored in the third wastewater tank T3 is stored in the first and second wastewater tanks T and T2. Collected into the same methane reservoir.

As such, the first, second, and third wastewater tanks T1, T2, and T3 continuously collect, store, dehydrate, and dry the wastewater over one year.

Of course, the discharge pipes 12, 13; 12-1, 13-2; 12-2, and 13-2 are discharged during the period in which the waste water is collected in the first, second and third wastewater tanks T1, T2 and T3. Since the wastewater is continuously supplied to the discharge line (L1) connected to the purification treatment device, the purification of the water is also continued.

The wastewater supply valve control member 7 serves to block or open the wastewater supply by a signal of a level sensor (not shown) installed in each of the wastewater tanks T1, T2, and T3.

The sludge deposited and accumulated in the tank is dewatered and dried, collected in the first wastewater tank T1 and fed to a grinder to be pulverized to a predetermined size.

Dried waste water sludge contains general waste, waste furniture, building waste, etc.

At this time, the crusher is put into the crusher together with the dried household waste (paper, vinyl, wood, rubber, styrofoam, waste ascon, palm tree, etc. collected household waste) and crushed into 2 ~ 5mm size.

The sludge mixture of sludge and domestic waste material is preferably crushed to a size of 3mm or less.

Of course, it is preferable that the household waste material is not collected but crushed to an appropriate size at the time of crushing the sludge.

Moreover, the food waste is also dried in advance and then mixed into the grinder to be ground.

In this way, by mixing the domestic waste materials and food waste in the sludge and mixing coal powder such as anthracite coal to the mixed powder pulverized to a predetermined size, it becomes a solid fuel.

Sludge put into the grinder is added to 30 ~ 60% by weight, 40 ~ 70% by weight of other household waste and food waste and then pulverized to make a sludge mixed powder.

35 to 55% by weight of the sludge mixed powder thus produced is mixed with 45 to 65% by weight of coal powder to produce a ball-hole coal, a ball coal, a shell coal and the like, and can be used as a fuel of a cogeneration plant or as a home fuel.

Products such as the ball, coal, and coal briquettes prepared in this way has a calorie of 4,500 ~ 5,500 Kcal.

Meanwhile, while treating the sludge as described above, the lower and upper discharge pipes 12, 13; 12-1, 13-1; 12-2, 12- in the first to third wastewater tanks T1, T2, and T3. Wastewater discharged to the discharge line (L1) through 2) is supplied to the purification treatment device.

The purification treatment apparatus may include first and second settling tanks 40 and 50 and second and second settling tanks 41 and 51 to collect and treat the wastewater supplied from the first to third wastewater tanks T1, T2, and T3. , Filtration tanks 42, 52, chemical treatment tanks 43, 53, discharge tanks 44, 54, and the like. Here, the discharge tanks 44 and 54 are connected by a reuse line to be used for living water, for example, for toilet or cleaning. The first and second settling tanks 40 and 50, the second and second settling tanks 41 and 51, the filtration tanks 42 and 52, the chemical treatment tanks 43 and 53, and the discharge tanks 44 and 54, respectively, have discharge pipes d1 and d2. , d3, d4, d5, and the like, and opening and closing of the discharge pipes d1, d2, d3, d4, d5 are controlled by a valve.

The waste water purified by the purification treatment device is purified by secondary water and then reused as waste water such as toilet or cleaning water through the reuse line connected to the discharge tanks 44 and 54, and the rest is discharged into the river and the sea. .

As such, when purified and reused as waste water, tap water is saved about 40-50% and prevents pollution of rivers due to waste and waste water.

Hereinafter, a fuel manufacturing step using sludge that can be used for industrial or domestic use using wastewater of the present invention will be described.

First, collecting the wastewater into a plurality of sealed wastewater tanks to dry the sludge from the wastewater collected into the tank;

Precipitating sludge in the wastewater collected in the wastewater tank by the collecting step, and discharging water of the wastewater to the outside of the tank;

Collecting methane gas generated by the fermentation of precipitated sludge through a gas discharge pipe installed in the lid of the tank;

Opening the lid of the tank and putting a drier into the sludge to drain out the moisture collected in the drier to the outside;

It is configured to dry the sludge by supplying power to the dryer after dehydration.

The dried sludge is removed from the tank and fed to the grinder to be crushed.

Paper, newspapers, vinyl, fallen leaves, wood, rubber, styrofoam, waste ascon, palm trees, etc., which are collected during sludge crushing, are also crushed together. However, if the size of the household waste is too large, it may not be uniformly crushed, so it is preferable that the household waste is separately crushed in advance.

In the sludge crushing stage, the sludge and household waste are crushed to a size of 2 to 5 mm.

The size of the ground sludge mixture of sludge and domestic waste is preferably 3 mm or less.

Meanwhile, the food waste is also dried in advance and then mixed and crushed in the grinder.

The ground mixed sludge consists of 30 to 60% by weight and 40 to 70% by weight of other household and food waste.

The mixed sludge pulverized in this way is dried by passing through a tunnel drying furnace;

Mixing 45 to 65% by weight of coal with 35 to 55% by weight of the dried sludge mixed powder;

Product formation of the fuel using sludge is completed by press molding to form a ball coal, a shot coal, a briquette, and the like.

The temperature of the tunnel drying furnace in the drying step is a temperature of 150 ~ 250 ℃.

When the product is finished, the ball is packed into the ball, bullet, and briquettes.

On the contrary, 30 to 60% by weight of sludge and 40 to 70% by weight of wood are put into a grinder to grind to make a mixed powder of 2 mm or less. And the size of less than 3mm to be put into the grinder is preferred.

The sludge mixed powder thus pulverized is transferred to the next tunnel drying furnace.

The tunnel drying furnace is at a temperature of 150 to 250 ° C, and the mixed powder is completely dried as it passes through the drying furnace.

35-55% by weight of the dried sludge mixture is mixed with 45-65% by weight of coal powder to produce briquettes, lumps, etc. at low cost, and can be used for industrial or home use.

When used as a fuel for a cogeneration plant, electricity is produced and sold to KEPCO, and hot water and heat generated from the cogeneration plant can be supplied to nearby apartments, houses, offices, and malls.

Although the present invention has been described in detail with respect to a fuel production method and apparatus using wastewater sludge, the present invention is not limited to the above examples, and various changes within the scope of the claims, the detailed description of the invention, and the accompanying drawings. Modifications can be made and modifications and the like are, of course, within the scope of the present invention.

1 is a schematic view showing a method for producing a solid fuel using the waste water sludge of the present invention.

Figure 2 is a schematic diagram showing a purification treatment apparatus from the waste water tank of Figure 1;

Figure 3 is a block diagram showing the step of treating the sludge generated in the waste water.

4 is a cross-sectional view showing the waste water tank of FIG.

5 is a cross-sectional view showing a state in which the lid is opened in the waste water tank of FIG.

Figure 6 is a perspective view of a dryer for dewatering and drying the sludge by inserting the sludge in the waste water tank.

7 is a front view of the dryer 5.

8 is a step of preparing fuel by drying the waste water, household waste, and food waste, and then grinding, drying, mixing, and molding the waste water, household waste, and food waste; Schematic block diagram showing the steps of first and second precipitation, filtration, chemical treatment, reuse and discharge treatment.

9 is a sectional view showing another embodiment of a waste water tank.

* Description of the symbols for the main parts of the drawings *

7: Waste water supply valve control material 12, 13: Lower and upper supply pipe

15, 15-1, 15-2: lid 17: flange

18: hanger 30: dryer

31: upper frame (in the form of a ring) 33: electrode

T1, T2, T3: 1st, 2nd, 3rd wastewater tank

Claims (5)

Sequentially collecting wastewater into a plurality of closed wastewater tanks; Depositing sludge in the wastewater tank collected by the collecting step and discharging the wastewater water out of the tank; Collecting methane gas generated by the fermentation of precipitated sludge through a gas discharge pipe installed in the lid of the tank; Opening the lid of the tank and injecting the dryer into the sludge to discharge water collected in the dryer to the next wastewater tank where the sludge is collected and dewatering; Drying the sludge by supplying power to the dryer after the dehydration; Supplying sludge dried by the dryer to a grinder to grind; Pulverizing the collected household waste; Pulverizing household waste and dried food waste together to form a mixed sludge during the sludge crushing; A drying step of drying the mixed sludge through a tunnel drying furnace; Mixing 45 to 65% by weight of coal powder with 35 to 55% by weight of the dried sludge mixed powder; A process for producing fuel using wastewater sludge, comprising press molding to form a ball hole, a bullet, a briquette, and the like. The method according to claim 1, The dehydration step and the drying step is a step of putting the dryer in the cylindrical mesh form into the sludge of the waste water tank to discharge the water that has accumulated water into the network of the dryer to the waste water tank after the waste water is collected, and dewatered to the waste water tank, A fuel manufacturing method using wastewater sludge, characterized in that for drying the dewatered sludge by supplying power to the electric rod of the dryer. The method according to claim 1, The wastewater collected in the sealed wastewater tank in the wastewater collection step is discharged to the discharge line through the upper and lower discharge pipes installed in the wastewater tank and is supplied to the purification apparatus. Fuel production method using. Sludge from the collected wastewater is settled and the water is discharged to the wastewater tank after the wastewater is collected, and a plurality of wastewater tanks sealed by lids, A wastewater supply valve control member connected between the wastewater supply pipe and the wastewater supply line of the wastewater tank so that the wastewater is sequentially collected in the plurality of wastewater tanks;  Dryer which is inserted into sludge settled in wastewater tank to dewater and dry sludge, Purification treatment device for collecting and purifying sludge wastewater discharged from tank Fuel production apparatus using a waste water sludge, characterized in that it comprises a. The method according to claim 1, The dryer is composed of a ring-shaped upper frame and a cylindrical network structure having a lower portion than the upper portion of the mesh suspended from the frame, wherein the mesh has a plurality of electrodes installed at intervals around the upper frame. Fuel production apparatus using sludge.

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