KR20110011094A - Fuel manufacturing method using sludge occurred from foul water, and a device using the same method - Google Patents

Abstract

PURPOSE: A fuel producing method for recycling sewage/waste water sludge as solid fuel, and an apparatus thereof are provided to purify sewage and waste water for using in a bathroom. CONSTITUTION: A fuel producing method for recycling sewage/waste water sludge as solid fuel comprises the following steps: successively collecting sewage and waste water with sewage/waste water tanks; precipitating sludge inside the sewage/waste water tanks; discharging water to the outside of the sewage/waste water tanks; collecting methane gas using a gas discharge pipe installed on a cap of the sewage/waste water tanks; inserting a drier into the sewage/waste water tanks for dehydrating the sludge; drying and crushing the sludge; mixing the sludge with crushed food and life waste to make mixed sludge; drying the mixed sludge and adding coal powder; and press-molding the mixture.

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 the water. 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 domestic 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 generated from 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 crushing sludge and household wastes such as wood, fallen leaves, paper, synthetic resin, vinyl, 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 waste water sludge of the present invention comprises the steps of: sequentially collecting the waste water into a plurality of sealed waste water tanks; Depositing sludge in the wastewater tank collected 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 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; 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 collected wastewater sludge is precipitated and the water is discharged to the next wastewater tank in which the wastewater is collected, and the plurality of wastewater sealed by a lid Tank; A waste water supply valve control member connected between the waste water supply pipe and the waste water supply line of the waste water tank to sequentially collect the waste water into a plurality of waste water 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 and waste water as solid fuel, but also purifies the wastewater and recycles it into waste water, such as for toilets, secures insufficient water resources, and turns sludge into solid fuel to use electricity as electricity. By producing the fuel, an eco-friendly fuel is produced by installing a fuel manufacturing apparatus using wastewater sludge in each apartment, copper unit, and li unit.

In addition, the present invention has the effect of preventing the environmental pollution of rivers, rivers, seas and the like by purifying the remaining water except the sludge generated from the waste water and reused as head water, such as for the toilet.

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 waste water 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, which are collected through the wastewater supply lines (1, 2, 3) to the wastewater tanks (T1, T2, T3), are controlled by the wastewater supply valve. 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 waste water tank is composed of a plurality of sludge and water from the waste water, and the sludge is fermented for a predetermined period to generate methane gas, and the 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) in the upper part of the tank so that the waste water excluding the sludge is discharged out of the tank. It is installed spaced downward.

If the lower discharge pipes 12, 12-1, 12-2 of the discharge pipes 13, 12; 13-1, 12-1; 13-2, 12-2, which are spaced up and down, are blocked, the upper discharge pipe 13, 13-1 and 13-2) discharge the waste water to the outside 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.

The waste water tanks T1, T2, and T3 are coupled with a 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 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 waste water supply valve control member 7, and a supply pipe 4 is formed at 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 waste water 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 to the opening of the lid 15 by bolts 24.

The drain pipe 22 is disposed at the lower part of the waste water tank main 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. . The drain pipe 22 is connected to the next waste water tank in which the waste water is collected to allow sludge to settle. Here, the next wastewater tank where the wastewater is collected refers to the next tank where the wastewater is collected when dehydration and drying occur after the collection of the wastewater is completed.

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

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

The wastewater supply valve control member 7 is connected to the wastewater tanks T1, T2, and T3 in accordance with 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, a valve V1 is preferably installed between the wastewater discharge pipes 12 and 13 and the discharge line L1 provided in the tank main body 11. Similarly, the waste water discharge pipes 12-1, 13-2; 12-2, 13-2 and the discharge line L1 of the second waste water tank T2 and the third waste water 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 waste water tank or lift off the waste water 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 at 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, 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 so as 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 waste water tank T1 with the lid 16 open to the bottom of the tank, the moisture contained in the sludge S causes 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 and wastewater are 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 waste water tank or lift off the waste water tank.

As described above, the drying operation of the sludge S formed by dehydration and heating by the insertion of the dryer 30 is performed within a period in which the waste water is stored in the second waste water tank T2.

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

Since the sludge settling in the second wastewater tank T2 is completed in the same way as the dehydration and drying period of the first wastewater tank T1, it takes 3 to 4 months to the second wastewater tank T2. Methane gas generated from the same is collected in the methane gas storage for 3 to 4 months, similar to the first wastewater tank (T1). Then, while the waste water is supplied to the third waste water tank T3, the lid of the second waste water 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 and wastewater of the third wastewater tank T3 have been stored, the wastewater and wastewater are supplied to the first wastewater tank T1 again, and after the lid is opened, dewatering and drying of the sludge is performed. Likewise done. Of course, the methane gas generated in the third wastewater tank T3 during the 3 to 4 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 waste water tanks T1, T2, and T3 continuously collect, store, dehydrate, and dry the waste water 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 waste water tanks T1, T2, and T3. Waste water is continuously supplied to the discharge line (L1) connected to the purification treatment device through the water purification process.

The wastewater supply valve control member 7 serves to block or open the wastewater supply by a signal of a level sensor (not shown) provided 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, fed to a grinder, and pulverized to a predetermined size.

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

At this time, the pulverizer is put into a pulverizer with dried household waste (paper, vinyl, wood, rubber, styrofoam, waste ascon, palm trees, etc.) and pulverized to a size of 2 to 5 mm.

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.

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

The purification treatment apparatus includes primary sedimentation tanks 40 and 50 and secondary sedimentation tanks 41 and 51 to collect and treat the waste water supplied from the first to third waste water 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 the opening and closing of these 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 to 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 waste water of the present invention will be described.

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

Settling sludge in the sewage / 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.

When sludge is crushed, household waste (paper, newspapers, vinyl, fallen leaves, wood, rubber, styrofoam, waste ascon, palm trees, etc.) is 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, but various modifications within the scope of the claims, the detailed description of the invention and the accompanying drawings. It can carry out by deformation | transformation, and such a change, a deformation | transformation, etc. are naturally 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 from 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 it into the sludge of the waste water tank.

7 is a front view of the dryer 5.

8 is a step of preparing fuel by drying, crushing, drying, mixing, and shaping waste water, domestic 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 member 12, 13: Lower and upper supply pipes

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 waste water tank

Claims (5)

Sequentially collecting the waste water into a plurality of closed waste water tanks; Depositing sludge in the wastewater tank collected 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 a lid of the tank and putting a drier into the sludge to discharge water collected in the drier to a waste water tank after the sludge is collected and dewatering it; 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; Press molding to form a ball, a bullet, a briquette, etc. Fuel production method using a waste water sludge, characterized in that consisting of. The method according to claim 1, The dehydration step and the drying step is a step of putting the dryer in the cylindrical mesh type 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, A fuel manufacturing method using wastewater sludge, comprising the steps of drying the dewatered sludge by supplying power to an electric rod of a dryer. The method according to claim 1, The wastewater collected in the sewage / wastewater tank sealed in the wastewater collection step is discharged to the discharge line through upper and lower discharge pipes installed in the wastewater tank, and is supplied to the purification device. Fuel production method using. Sludge from the collected wastewater is settled, and water is discharged into the wastewater tank after the wastewater is collected, and a plurality of wastewater tanks sealed with 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 a plurality of wastewater tanks;  Dryer which is inserted into sludge settled in wastewater tank to dewater and dry sludge, Purification treatment device to collect and purify sewage and wastewater from sludge 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 which is narrower than the upper portion of the mesh suspended from the frame. The dryer has a plurality of electrode bars spaced around the upper frame. Fuel production apparatus using sludge.

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