KR101599989B1 - Drying and fermenting apparatus for sludge - Google Patents

Abstract

Disclosed is an apparatus for fermenting and drying sludge. More particularly, the apparatus of the present invention is constituted so as to ferment and dry sludge cake such as sewage, wastewater, residues, etc., which is primarily dehydrated through a centrifuge dehydrator, using warm water and warm air, thereby innovatively reducing water content. Further, the apparatus reduces volume of sludge cake and thus remarkably reduces costs of sludge treatment. The apparatus for fermenting and drying sludge comprises: a sludge cake supply unit; a case including an injection part and a discharge part; a mixing-conveying unit; a fermentation warm water tank; a drying unit including an air warming pipe, a warm air injection pipe, and a warm air discharge pipe; and a ventilation unit.

Description

[0001] DRYING AND FERMENTING APPARATUS FOR SLUDGE [0002]

The present invention relates to a sludge fermentation drying apparatus, and more particularly, to a sludge fermentation drying apparatus that is capable of drastically reducing a water content by fermenting and drying a sludge cake such as bottom / wastewater, debris, and the like dehydrated first through a centrifugal dehydrator through hot water and warm air And a sludge fermentation drying device configured to significantly reduce the cost of the sludge treatment by reducing the volume of the sludge cake.

Most of the sludge such as waste water, waste water, and debris generated in the home, industrial site, agriculture and livestock farming site, food processing facility, etc. is dehydrated after the chemical agglomeration and discharged to the high moisture content sludge cake around 80% Although the energy cost for the operation of the treatment facility is excessive, there is no realistic technology to install and operate a facility with high facility cost or high operation cost.

In general, sludge disposal costs account for a large portion of the sewage / wastewater treatment costs. For example, in sewage terminal treatment plants, approximately one-fifth or more of total operating costs are spent for sludge disposal costs. Therefore, it is an important task to reduce sludge disposal cost in order to reduce the waste water treatment cost. Among the sludge disposal costs, most of the transportation costs and disposal of cakes (dehydrated concentrated sludge) are due to disposal treatment.

Conventional sludge treatment facilities are regarded as a kind of waste treatment facility, and not only enormous amount of energy is consumed in operation of treatment facilities, but also harmful factors such as odor, leachate, dust, By polluting the environment, it becomes a cause of complaints. In addition, by treating recyclable resources as wastes, it also goes against the national policy of resource recycling.

Here, the sludge disposal ratio is closely related to the water content. When the water content is lowered, the amount of cake generation is decreased. If the moisture content is less than 10% by weight, the organic matter contained in the sewage can be recycled, and the processing cost of the sludge cake treatment can be reduced.

On the other hand, in the case of the sludge treatment method developed so far, most of them use the method of heating and drying through microwave and direct heating. Since it is necessary to heat for a long time, the heat loss is large and the electricity cost is large. In addition, it is not only necessary to feed the dried product to the livestock, but also it may lead to lethal salt poisoning. In the case of fertilizing the soil, salt accumulation or decaying decomposition due to the decolorizing bacteria occurs and the sickness of the crop is deepened, There is a problem that secondary pollution is generated.

Accordingly, it is urgently required to develop a device capable of preventing environmental contamination due to treatment of sludge by effectively treating waste materials containing a large amount of moisture such as sludge cake, and solving the problems of the conventional sludge disposal method .

The present invention relates to a fermentation drying method for treating a sludge cake, which comprises fermenting and drying a sludge cake such as bottom / wastewater and debris, which is first dehydrated through a centrifugal dehydrator, through hot water and warm air, Thereby reducing the volume of the sludge cake, thereby significantly reducing the cost of the sludge treatment.

It is an object of the present invention to provide a sludge cake supply apparatus, comprising a sludge cake supply unit configured to sequentially supply a sludge cake such as waste water, debris, and the like, which is first dehydrated through a centrifugal dehydrator, The sludge cakes are supplied to the sludge cake supplying part and the sludge cakes. The sludge cakes are supplied to the sludge cake supplying part, And the sludge cake is filled with hot water to heat the sludge cake inside the case to heat the sludge cake. The sludge cake is fermented on one side of the sludge cake, A hot water inlet is formed and a hot water outlet is formed on the other side A hot water tank for supplying hot water supplied from the hot water generator to the inside of the hot water generator through the hot water inlet and then discharged through a hot water outlet; And an air heating pipe connected to the other side of the case to supply heated air supplied from the air heating pipe to the outside of the case, A drying unit including a warm air inlet pipe configured to be poured into the case to dry the sludge cake inside the case and a hot air discharge pipe connected to one side of the case to discharge the heated air introduced into the case; A heating pipe, a warm air inlet pipe and a hot air outlet pipe, and is supplied from the air heating pipe In opened by the air in the hot air injection pipe and provide a fermented sludge drying apparatus for the air discharged through the hot air discharge pipe characterized in that configured to include a blowing means consisting of the recycled hot air injection pipe can be achieved.

The sludge fermentation drying apparatus according to the present invention transfers sludge cake such as bottom / wastewater, debris, and the like, which have been dehydrated through a centrifugal dehydrator, to the inside of the case while being heated through hot water of the fermented hot water tank, Since the water content is drastically reduced by fermentation and drying through the air, the cost of the sludge treatment can be remarkably reduced.

In addition, since the sludge cake is fermented and dried, the organic waste can be fermented and dried to be used as a raw material for livestock feed and raw materials or organic compost. In addition, since carbonization does not occur during the fermentation drying process, There is an effect that environmental pollution does not occur.

1 is a schematic view of a sludge fermentation drying apparatus according to the present invention,
2 is a schematic view showing an enlarged view of a main part of a sludge fermentation drying apparatus according to the present invention,
3 and 4 are views for explaining stirring pieces and shredding pieces in the sludge fermentation drying apparatus according to the present invention,
5 is a view for explaining a blowing means in the sludge fermentation drying apparatus according to the present invention,
6 is a view for explaining a water eliminator in the sludge fermentation drying apparatus according to the present invention.

Hereinafter, a sludge fermentation drying apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of a sludge fermentation and drying apparatus according to the present invention, FIG. 2 is a schematic view showing a major part of a sludge fermentation drying apparatus according to the present invention, and FIGS. 3 and 4 are sludge fermentation FIG. 5 is a view for explaining a blowing means in the sludge fermentation drying apparatus according to the present invention. FIG.

The present invention is installed at the rear end of the centrifugal dehydrator. As described above, the bottom / waste water and the debris primarily dehydrated through the centrifugal dehydrator are discharged to a high moisture content sludge cake having a water content of about 80%. The sludge cake having a high moisture content is used for the fermentation drying apparatus according to the present invention And fermented and dried through hot water and warm air, and the water content is reduced to 10% by weight or less.

1 and 2, a sludge fermentation drying apparatus according to the present invention includes a sludge cake supply unit 100, a case 200, a stirring and conveying means 300, a fermentation hot water tank 400, a drying unit 500, And a blowing means (600).

The sludge cake supply unit 100 is configured to sequentially inject sludge cake S such as waste water, waste water, and the like, which is dehydrated first through a centrifugal dehydrator. That is, the sludge cake supplying unit 100 is configured to feed the sludge cake S to the upper side and sequentially supply the sludge cake S through the sludge discharging hole 110 formed at the lower side. The sludge outlet 110 may be provided with a valve 120 to control the amount of the sludge cake discharged through the sludge outlet 110.

The case 200 has an airtight structure in which a sludge cake S can be transported and a sludge cake S supplied from the sludge cake supplying unit 100 is introduced into the case 200, And a discharge port 130 through which the sludge cake S is discharged is formed on the other side. That is, in the case 200, the sludge cake S fed through the inlet 220 is fed from the sludge cake feeding unit 100, and is fermented and dried. Thereafter, the fermentation drying and conveying space to provide.

The stirring and conveying means 300 is configured to convey the sludge cake S injected into the inlet 220 to the outlet 130 while stirring the stirring sludge cake S in the case 200. More specifically, the stirring and conveying means 300 includes a rotating drum 310, a driving means 320, a conveying screw 330, a stirring piece 340 and a crushing piece 350.

The rotary drum 310 is installed in the case 200 so as to be long along the longitudinal direction and is supported by the main shaft 311. Both ends of the main shaft 311 are inserted into the mounting hole 150 of the case 200, As shown in Fig.

The driving unit 320 is axially coupled to the rotary drum 310 to rotate the rotary drum 310. More specifically, the driving means 320 includes a driven gear 321 coupled to the main shaft 311 of the rotary drum protruded to one side of the case 200, a driving gear 322 fitted to the driven gear 321, And a driving motor 323 that is coupled to the driving gear 322 to rotate the driving gear 322. [ Of course, the driving means 320 may be configured to rotate the main shaft 311 of the rotary drum 310 by using a chain or belt system in addition to the gear system described above.

The conveying screw 330 is formed in a spiral shape on the outer circumferential surface of the rotary drum 310 to convey the sludge cake S injected into the inlet 220 to the discharge port 230 side. That is, the sludge cake introduced into the case 200 is guided by the conveying screw 330 formed on the outer circumferential surface of the rotary drum 310 by the rotation of the rotary drum 310, and is conveyed to the discharge port 230 side.

The agitating pieces 340 are provided between the conveying screws 330 so as to be continuous with each other at predetermined intervals along the same line as the trajectory of the conveying screws 330 so that the sludge cake located at the lower portion of the case 200 And stirring the mixture. 3, when the rotary drum 310 rotates, the sludge cake S is conveyed along the conveying screw 330, and the sludge cake S is conveyed along the conveying screw 330, The sludge cake S under the case 200 is pushed up and dropped again into the case so that the sludge cake S is agitated. In addition, since the agitating piece 340 is inclined, the sludge cake S pumped up by the agitating piece 340 sequentially flows down to the lower side of the case 200, Effect is obtained.

As shown in FIG. 3, the crushing piece 350 has a shape in which a plurality of crushing blades 351 are concavely arranged in a V-shape at a lower side of the stirring piece 340. That is, the sludge is crushed while the sludge flowing down from the stirring piece 340 passes through the crushing groove 352 between the crushing blades 351. Since the crushing blade 351 is concavely arranged in a "V" shape, the sludge flowing down from the stirring piece 340 is easily received therein and the sludge 340 is efficiently crushed. Therefore, since the sludge cake S is conveyed in the case 200 while keeping the sludge cake S in the form of finely pulverized by the crushing piece 340, the heated air supplied into the case through the hot air inlet tube, which will be described later, (S), so that the drying efficiency of the sludge cake is remarkably increased.

4, it is preferable that the crushing grooves 352-1, 352-2, and 253-3 between the crushing blades 351 have a larger width toward the rear end of the rotating drum. That is, the sludge cake S located at the front end of the case 200 contains a large amount of water and is easy to pass through even a small size crushing groove. However, as the sludge cake is gradually dried toward the rear end of the case 200 Accordingly, the sizes of the crushing grooves 352-1, 352-2, and 253-3 gradually increase according to the drying process of the sludge cake, so that the sludge cake in the drying process can be easily pulverized while passing through the crushing grooves.

The fermented hot water tank 400 is integrally formed by enclosing the outer surface of the case 200 and stores hot water therein to ferment the sludge cake through heat exchange with the sludge cake S in the case 200 do. Here, the fermented hot water tank 400 may be configured to heat water in the fermented hot water tank by providing a heating body therein, but it is configured to supply heat for fermentation by receiving hot water heated from the outside desirable. A hot water inlet 410 is formed at one side of the outer surface of the fermented hot water tank 400 and a hot water outlet 420 is formed at the other side of the fermented hot water tank 400. The hot water supplied from the hot water generator 430 flows into the hot water inlet 410, And then is discharged through the hot water outlet 420. [0050] The hot water generator 430 may be configured to reduce the heating cost of hot water by using a hot water generator that generates hot water by using the heat generated during the sludge disposal of the sewage end treatment plant. That is, it is preferable to apply the "hot water generator using the wastewater treatment system" of Patent Registration No. 1511769, which is registered and registered by the present applicant.

The drying unit 500 supplies the heated air into the case 200 to dry the sludge cake S transferred in the case 200. More specifically, the drying unit 500 includes an air intake port 511 through which air is introduced at one end, and is introduced into the fermented hot water tank 400 to be discharged to the outside, An air heating pipe 510 for heating and supplying the air introduced through the heat exchange with the hot water in the case 400 and the air heated by the air heating pipe 510 connected to the other side of the case 200, The hot air inlet pipe 520 is installed in the case 200 to dry the sludge cake S inside the case and the heated air introduced into the case 100 is connected to one side of the case 200, And a hot air discharge pipe 530 for discharging the hot air. That is, the air supplied from the outside through the air suction pipe 510 is heated by heat exchange with the hot water in the fermented hot water tank 400 while being transferred along the air heating pipe installed in the fermented hot water tank 400 The heated air is supplied to the inside of the case through the warm air inlet pipe 520 to dry the sludge cake S. The air circulated in the case 200 is discharged through the hot air discharge pipe 530.

Here, the air heating pipe 510 inserted into the fermentation hot water tank 400 may be wound so as to be spirally wound many times inside the fermentation hot water tank. That is, the air heating pipe 510, which is spirally wound many times inside the fermentation hot water tank 400, is installed with a long length in the fermentation hot water tank, and air moving in the air heating pipe 510 is supplied to the fermentation hot water tank 400 The heat efficiency of the air in the air heating pipe 510 is greatly improved.

The air blowing means 600 is installed between the air heating pipe 510, the hot air inlet pipe 520 and the hot air discharge pipe 530 to supply the heated air supplied from the air heating pipe 510 to the warm air inlet pipe 520, and circulates the air discharged through the hot air discharge pipe 530 to the hot air supply pipe 520.

5, the blowing unit 600 includes a blower 610 connected to the hot air discharge pipe 530 for blowing air discharged to the hot air discharge pipe, a blower 610 for blowing air blown from the blower 610, And an ejector 620 configured to mix the air discharged from the hot air discharge pipe 530 with the air heated by the air heating pipe 510 and to introduce the mixed air into the hot air inlet pipe 520. More specifically, the ejector 620 includes a supply port 621 connected to the blower 610 to supply air to be used as a power source, a suction port connected to the air heating pipe 510 for sucking the heated air, An outlet 623 connected to the hot air inlet pipe 520 and through which mixed air of the air introduced into the inlet 621 and the heated air drawn into the inlet 622 flows out, And a nozzle 624 which is installed in front of the sphere 621 and generates negative pressure so that the air heated by the suction port 623 can be sucked by using the gas energy of air supplied to the supply port 621. [ That is, when the air discharged from the hot air discharge pipe 530 is supplied to the ejector 620 by the blower 610 through the supply port 621, the ejector 620 is rotated by the negative pressure formed on the suction port 622 by the nozzle 624, The mixed air of the air introduced into the supply port 621 and the heated air sucked into the suction port 622 flows out through the outlet 623.

In the sludge fermentation drying apparatus according to the present invention, the sludge cake such as bottom / wastewater, debris, and the like, which is dehydrated first through the centrifugal dehydrator, is transferred through the case while being heated through hot water and hot water in the fermented hot water tank, The fermentation and drying can be carried out through the heated air, and the water content can be drastically reduced. Therefore, the cost of the sludge treatment can be remarkably reduced.

In addition, since the sludge cake is fermented and dried, the organic waste can be fermented and dried to be used as a raw material for livestock feed and raw materials or organic compost. In addition, since carbonization does not occur during the fermentation drying process, There is an advantage that environmental pollution does not occur.

A moisture remover 700 is provided between the hot air discharge pipe 630 and the air blowing means 600 to remove moisture from the air discharged through the hot air discharge pipe 530. That is, since the air that is dried in the case 200 and discharged through the hot air discharge pipe 530 contains a large amount of water, the air containing the moisture is returned into the case 200 The sludge drying efficiency is lowered. Therefore, the moisture removed from the air discharged through the hot air discharge pipe 530 through the water remover 700 can be removed and then re-introduced into the case 200.

6, the water eliminator 700 has an air inlet 711 connected to a hot air discharge pipe 530 at one side thereof and an air outlet 712 formed at the other side thereof And upper and lower rib plates 721 and 722 are formed on the upper and lower surfaces of the body 710, respectively. The upper and lower rib plates 721 and 722 are spaced apart from each other by a predetermined distance to form a flow path 723 through which the air flows from the air inlet 711 to the air outlet 712 side. The water eliminator 700 includes a drain 711 formed at a lower portion of the main body 710 for collecting and discharging moisture discharged from the air flowing through the channel 723 through a discharge hole 731 communicated with the main body 710, (730).

That is, the water eliminator 700 forms the passage 723 in a zigzag shape through the upper and lower ribs 721 and 722, so that the air discharged from the hot air discharge pipe 530 according to the airflow generated in the air blower 610 And is conveyed along the inside of the flow path 723. At this time, the water particles contained in the air conveyed along the airflow generated by the blower 610 collide with the upper and lower surfaces of the main body 710 and are condensed and fall down by their own weight, and the dropped water is discharged through the discharge holes 731 And is collected in the drain portion 730 through the drain portion 730.

Therefore, since water is sequentially removed while moving the flow path 723 of the water eliminator 700, only the air from which moisture has been removed is discharged to the air discharge port 712, and only the air in which moisture is removed is supplied to the inside of the case Therefore, there is an advantage that drying of the sludge in the case is more efficiently performed.

100: sludge cake supply part 200: case
300: stirring and conveying means 400: fermentation hot water tank
500: drying unit 600: blowing means
700: Moisture eliminator

Claims (4)

A sludge cake supply unit configured to sequentially discharge a sludge cake such as waste water, debris, and the like, which is first dehydrated through a centrifugal dehydrator,
A case having a closed structure in which a space through which a sludge cake can be conveyed is formed, an inlet through which the sludge cake supplied from the sludge cake supply part is inserted and a discharge port through which the sludge cake is discharged is formed on the other side,
A stirring and conveying means for stirring and conveying the sludge cake introduced into the inlet port to the discharge port side,
The hot water inlet is formed at one side of the outer surface of the case and the hot water outlet is formed at the other side of the case. A hot water tank for hot water supplied from the hot water generator through the hot water inlet and then discharged through a hot water outlet;
An air heating tube having an air inlet formed at one end thereof for introducing outside air into the fermented hot water tank and being discharged to the outside so as to heat and supply the introduced air through heat exchange with hot water in the fermented hot water tank; A hot air inlet pipe connected to the other side of the case to supply heated air supplied from the air heating pipe to the inside of the case to dry the sludge cake inside the case; A drying unit comprising a hot air discharge pipe for discharging the introduced heated air,
The hot air supply tube is installed between the air heating tube, the hot air inlet tube and the hot air outlet tube, and the heated air supplied from the air heating tube is introduced into the hot air inlet tube, and the air discharged through the hot air outlet tube is circulated to the hot air inlet tube And an air blowing means,
The agitating and conveying means includes a rotary drum installed in the case so as to be long in the longitudinal direction and rotatably installed therein, a driving means for rotating the rotary drum, a sludge cake provided in a spiral shape on the outer peripheral surface of the rotary drum, And a conveying screw for conveying the sludge cake to the discharge port side and a conveyance screw for conveying the sludge cake to the lower side of the case at predetermined intervals along a line such as the trajectory of the conveyance screw, And a plurality of pulverizing blades are concavely arranged in a shape of "V" on the lower side of the stirring member, so that sludge flowing down from the stirring blade passes through the pulverizing groove between the pulverizing blades, Wherein the crushing grooves between the crushing blades are formed in the rotating drum And a crushing piece which is formed so that its width becomes wider toward the rear end portion,
The air heating pipe inserted into the fermented hot water tank is spirally wound many times inside the fermented hot water tank so that the air moving in the air heating pipe can be heat exchanged with the hot water in the fermented hot water tank for a long time ,
And a water eliminator for removing moisture from the air discharged through the hot air discharge pipe is provided between the hot air discharge pipe and the blower means. The water eliminator has an air inlet connected to the hot air discharge pipe at one side of the upper side, And upper and lower rib plates are formed on the upper and lower surfaces of the body, respectively. The upper and lower rib plates are spaced apart from each other by a predetermined distance so that the air is guided from the air inlet to the air outlet side, And a drain portion formed at a lower portion of the main body and collecting and discharging moisture discharged from the air flowing through the discharge hole communicating with the main body.
delete The method according to claim 1,
The blowing means,
A blower connected to the hot air discharge pipe for blowing air discharged to the hot air discharge pipe,
A supply port connected to the blower for supplying air to be used as a power source; a suction port connected to the air heating pipe for sucking the heated air; an air inlet connected to the hot air inlet pipe, And a nozzle for generating a negative pressure such that the air heated by the suction port can be sucked by using the gas energy of the air which is installed in front of the supply port and introduced into the supply port, Wherein the sludge fermentation drying apparatus further comprises:
delete

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