WO2021125698A1

WO2021125698A1 - Vertical cylinder-type anaerobic digestion device for processing organic waste

Info

Publication number: WO2021125698A1
Application number: PCT/KR2020/018126
Authority: WO
Inventors: 김영호; 이재명; 김창영; 성기현; 최병철; 김범석; 이재철; 안현정; 이가영; 이혜윤; 김민준
Original assignee: 주식회사 케이이씨시스템
Priority date: 2019-12-16
Filing date: 2020-12-11
Publication date: 2021-06-24
Also published as: CN114761363A; KR102098046B1

Abstract

The present invention relates to a vertical cylinder-type anaerobic digestion device for processing organic waste, comprising: an anaerobic digestion tank (100); a perforated tube (200) installed in the longitudinal direction of the anaerobic digestion tank (100) and positioned between the center of the anaerobic digestion tank (100) and the inner peripheral surface thereof, the perforated tube (200) having holes (210) formed through the outer peripheral surface thereof such that organic waste can freely pass therethrough; and a transfer screw (300) installed in the perforated tube (200) so as to transfer sediments from the lower side to the upper side such that undecomposed organic waste can be decomposed in the process of being transferred. Accordingly, during the process in which the transfer screw transfers organic waste from the lower side to the upper side, sufficient decomposition through contact with microorganisms can be induced such that, by improving the efficiency of decomposition of undecomposed organic waste, an increased amount of biogas can be produced.

Description

Vertical anaerobic digestion system for organic waste treatment

The present invention relates to a vertical vertical anaerobic digestion apparatus for organic waste treatment, and more particularly, the undecomposed organic waste (sludge and contaminants) accumulated on the floor is transferred from the lower side to the upper side, and sufficient decomposition is achieved in the transport process. It relates to a vertical vertical anaerobic digestion system for organic waste treatment that can improve the decomposition efficiency and thus realize increased production of biogas.

In general, wastewater such as sewage, sewage, and manure generated from households, livestock farms, and industrial sites contains a large amount of organic matter, and biological and chemical oxygen demand, suspended matter content, etc. If it is discharged without reaching the standard, the soil or water quality will be polluted.

Accordingly, it is desirable to reduce environmental pollution by discharging organic matter in wastewater in a purified state through biological, physical, and chemical treatment to a river or the like.

However, when treating organic matter in wastewater by a physical method, the treatment effect is insufficient, and chemical treatment requires a lot of treatment cost along with water pollution, so a biological method using microorganisms is mainly used in recent years.

Anaerobic digestion process, which is one of these biological methods, is a reaction in which anaerobic microorganisms consume organic matter, decompose it, and release inorganic compounds and digestive gas (biogas).

The anaerobic digestion process is a traditional technology that has been established for a long time, also called “methane fermentation”, and the main purpose of the anaerobic digestion process is to recover energy called methane at the same time as organic waste treatment.

In general, anaerobic digestion treatment is largely divided into pretreatment process, anaerobic digestion process, gas collection and refining process, and solid material recycling process. Most anaerobic digestion processes are applied to those with a solid content of less than 10%. It is also applicable to high-concentration organic waste with a solid content of around 25%.

As a conventional anaerobic digestion system, Korean Patent Registration No. 10-1209132 (horizontal anaerobic digestion apparatus for organic waste treatment) and Korean Patent Registration No. 10-1209133 (cylindrical anaerobic digestion apparatus for organic waste treatment) and Republic of Korea registration Patent No. 10-2023639 (high-rate dry anaerobic digestion system for high-concentration organic waste treatment) and the like, which discloses a technology capable of producing biogas through the digestion process of organic waste.

However, the prior art focuses only on the fact that the sedimented organic waste is easily discharged, so when the organic waste is precipitated to the bottom of the digester, it is only discharged using a screw, and obtaining biogas from the sedimented organic waste was not considered at all. .

The present invention has been devised to solve the above problems, and by transferring undecomposed organic wastes (sludge and contaminants) accumulated on the floor from the bottom to the top so that sufficient decomposition is made in the transport process, the production efficiency of biogas is improved. An object of the present invention is to provide a vertical anaerobic digestion system for organic waste treatment.

The present invention for achieving the above object,

anaerobic digester;

a perforated pipe installed in the longitudinal direction of the anaerobic digester to be positioned between the center and the inner circumferential surface of the anaerobic digester, the perforated pipe having a perforated surface on the outer circumferential surface to allow the organic waste to pass freely;

and a transfer screw installed in the perforated pipe to transfer the sediment from the lower side to the upper side so that the undecomposed organic waste can be decomposed in the process of being transferred.

In addition, the present invention,

Inside the anaerobic digester, a stirrer for removing scum, destroying the oil layer, and stirring organic waste is further reinforced by being installed side by side in the upper and lower portions in a direction orthogonal to the anaerobic digester; characterized in that do.

Here, the inner bottom of the anaerobic digester is formed to be inclined downward toward the lower end of the perforated pipe; characterized in that.

In addition, the present invention,

It is characterized in that the upper end of the outer peripheral surface of the anaerobic digester is further provided with a reinforcing screw for collecting the float so that the float can be discharged to the outside.

In addition, the present invention,

a first pump for pressurizing the extinguishing liquid discharged through the upper outlet;

and a centrifugal dehydrator for discharging the digested liquid pressurized by the first pump to a purification facility after centrifugation.

In addition, the present invention,

a first pump for pressurizing the sediment discharged through the lower outlet;

a centrifugal dehydrator for separating the liquid phase by centrifuging the sediment pumped by the first pump;

It characterized in that it further comprises; a second pump for conveying the liquid separated from the centrifugal dehydrator by pressure to the inlet.

In addition, the present invention,

The interior of the anaerobic digester is characterized in that it is heated by a hot water pipe installed on the inner peripheral surface.

The present invention can induce the smooth discharge of biogas generated in the anaerobic digestion process as the agitator disposed side by side inside the anaerobic digestion tank removes scum and destroys the oil layer while stirring the organic waste, and of the anaerobic digester Since the transfer screw installed in the longitudinal direction can induce sufficient decomposition by contact with microorganisms in the process of transferring the organic waste from the lower side to the upper side, the decomposition efficiency of the undecomposed organic waste is improved, thereby reducing the production of biogas. be able to increase

In particular, in the process of organic waste being transported by the transfer screw, organic waste and microorganisms freely pass through the hole in the perforated pipe and come into contact with each other, so it is possible to induce smooth decomposition of undecomposed organic waste, and thus This has the advantage of increasing productivity.

In addition, the sediment (sludge and impurities in organic waste) discharged through the first outlet is pumped to the centrifugal dehydrator through the first pump, and the pressurized sediment (sludge and impurities in organic waste) is centrifuged in the centrifugal dehydrator. After the liquid phase is pumped through the second pump and re-introduced into the anaerobic digester, it is possible to increase the production efficiency of biogas.

In addition, it is possible to further increase the productivity of biogas by discharging and removing waste vinyl or microplastics that are not conducive to the production of biogas through the screw for collecting suspended matter.

1 is a view showing a first embodiment of a vertical vertical anaerobic digestion apparatus for organic waste treatment according to the present invention.

Figure 2 is a perspective view showing a separately extracted perforated pipe from the vertical anaerobic digestion apparatus for organic waste treatment according to the present invention.

Figure 3 is a plan view of a vertical vertical anaerobic digestion apparatus for organic waste treatment according to the present invention.

Figure 4 is a view showing a second embodiment of the vertical anaerobic digestion apparatus for organic waste treatment according to the present invention.

Figure 5 is a view showing a third embodiment of the vertical anaerobic digestion apparatus for organic waste treatment according to the present invention.

6 is a graph measuring the methane generation efficiency of the vertical vertical anaerobic digestion apparatus for organic waste treatment according to the third embodiment of the present invention.

Hereinafter, it will be described in more detail based on the accompanying drawings.

1 is a view showing a first embodiment of a vertical anaerobic digestion apparatus for organic waste treatment according to the present invention, Figure 2 is a vertical vertical anaerobic digestion apparatus for organic waste treatment according to the present invention, a perforated pipe is separately It is an excerpted perspective view, and FIG. 3 is a plan sectional view of a vertical vertical anaerobic digestion apparatus for organic waste treatment according to the present invention.

1 to 3, the vertical anaerobic digestion apparatus for organic waste treatment according to the first embodiment is composed of an anaerobic digestion tank 100, a perforated pipe 200, and a transfer screw 300, according to Technical characteristics that can improve decomposition efficiency and increase biogas production by transferring undecomposed organic wastes (sludge and contaminants) accumulated on the floor from the bottom to the top so that sufficient decomposition occurs during the transport process There is this.

Referring to FIG. 1 , the anaerobic digester 100 is made of metal or concrete, and includes a storage tank 110 and a cover 120 .

The storage bin 110 has a cylindrical shape, a space is provided therein so that organic waste can be accommodated, and the shape of the storage bin 110 may be modified in various known embodiments as necessary.

In addition, a first discharge pipe 111 and a second discharge pipe 112 communicating with the internal space are formed on the outer peripheral surface of the lower end and the upper end of the reservoir 110, respectively, and the first discharge pipe 111 has a first discharge pipe ( A first valve V1 for opening and closing 111 is installed, and a second valve V2 for opening and closing the second discharge pipe 112 is installed in the second discharge pipe 112 .

Here, the precipitated contaminants and sludge are discharged through the first discharge pipe 111 , and the digestive juice is discharged through the second discharge pipe 112 .

The cover 120 is disposed on the upper surface of the reservoir 110 and is coupled to the reservoir 110 through a fixing means (eg, a bolt and a nut) to close the upper portion of the reservoir 110 .

An inlet 121 and a gas outlet 122 communicating with the internal space of the storage container 110 are formed on the upper surface of the cover 120, respectively, and organic waste is stored in the storage container 110 through the inlet 121. ), and biogas generated during the decomposition of organic waste is discharged through the gas outlet 122 .

For reference, the gas outlet 122 is connected to a gas storage tank (not shown) for storing biogas.

1 and 2, the perforated pipe 200 is a circular pipe, and in this embodiment, it is installed in the longitudinal direction of the reservoir 110 to be positioned between the center (vertical axis) and the inner circumferential surface of the reservoir 110.

A plurality of perforations 210 are formed on the outer circumferential surface of the perforated pipe 200 , and organic waste stored in the anaerobic digester 100 can freely pass through the perforated 210 .

In addition, at the lower end of the perforated pipe 200, an opening 220 opened to a predetermined size is formed to face each other, and to the upper end of the opening 220 opened to a predetermined size and the end of the second outlet 112 and A hole to be connected to communication is provided, and the organic waste deposited on the bottom of the reservoir 110 can be easily introduced and discharged through the opening 220 .

On the other hand, the inner bottom surface of the storage tank 110 is formed to be inclined downward toward the opening 220 of the perforated pipe 200 so that the organic waste deposited to the bottom can be smoothly introduced into the opening 220 of the perforated pipe 200 . has been

Referring to FIG. 1, the transfer screw 300 is installed in the longitudinal direction of the perforated pipe 200 to transfer the organic waste from the lower side to the upper side so that the undecomposed organic waste can be decomposed in the process of being transferred. do.

In particular, in the process in which the organic waste is transported by the transfer screw 300, the organic waste freely passes through the perforation 210 of the perforated pipe 200 and actively contacts each other, and thus the undecomposed organic waste is Since it can be more smoothly decomposed, there is an advantage in that biogas productivity is increased.

Referring to Figure 1, inside the anaerobic digester 100, the agitator 400 installed side by side in the upper and lower portions in a direction orthogonal to the anaerobic digester 100 is further reinforced.

For example, the agitator 400 disposed at the inner upper end of the anaerobic digester 100 serves to remove scum and agitate the organic waste, and the agitator 400 disposed at the inner lower end of the anaerobic digester 100 is an oily layer (Oil layer) serves to destroy and agitate organic waste, and by the action of the agitator 400 as described above, it is possible to induce smooth discharge of biogas generated in the anaerobic digestion process.

In addition, the blades of the stirrer 400 have different sizes and form a predetermined angle, and when the stirrer 400 rotates, the anaerobic organic material is stirred by the blades and moves from right to left.

On the other hand, as shown in Figure 1, the inner peripheral surface of the anaerobic digester 100 is further provided with a hot water pipe 130 for internal heating, whereby the internal temperature of the anaerobic digester 100 is 36 ℃ ~ 40 ℃ is maintained as

On the other hand, the organic waste is mixed with waste vinyl, microplastic, etc. in addition to food waste and put into the air digestion tank 100. Such waste vinyl or microplastic is not decomposed, and the biogas is discharged while floating on the surface. of course, as the waste vinyl is caught on the blades of the stirrer 400, it interferes with stirring and causes malfunction.

In order to collect and discharge the floating waste vinyl or microplastics to the outside, the upper outer peripheral surface of the storage bin 110 constituting the air-gas digestion tank 100 is provided in communication with the inside of the floating material collection screw 500 Reinforced did it

According to this, the waste vinyl or microplastic floating on the upper part is moved by the rotation of the agitator 400, and when it reaches the floating material collection screw 500 in the process of moving, it is moved by the floating material collection screw 500. discharged to the outside

As described above, by discharging and removing waste vinyl or microplastics that are not conducive to the production of biogas through the screw 500 for collecting floating matter as a medium, it is possible to further increase the productivity of biogas.

The operation of the first embodiment of the present invention having the above configuration will be described as follows.

First, the organic waste is input through the inlet 121 of the anaerobic digester 100 .

At this time, hot water is supplied through the hot water pipe 130 of the anaerobic digester 100, and the internal temperature is operated under the condition of 36° C. to 40° C., and the residence time is 40 days depending on the type and concentration of organic waste.

In this state, the agitator 400 arranged side by side inside the anaerobic digester 100 removes scum and destroys the oil layer while stirring the organic waste.

On the other hand, the sludge or contaminants among the organic wastes injected into the anaerobic digester 100 are guided by the inclined bottom surface of the anaerobic digester 100 and are put into the transfer screw 300 built into the perforated pipe 200, The transfer screw 300 transfers the sludge or contaminants from the lower side to the upper side.

As described above, in the process of transferring the organic waste through the transfer screw 300 as a medium, some of the organic waste is discharged to the surroundings through the perforated 210 of the perforated pipe 200 and the surrounding organic waste is introduced through the perforated 210. Accordingly, since sufficient decomposition by contact with microorganisms can be made, the production of biogas according to the improvement of the decomposition efficiency is increased.

On the other hand, the organic waste is put in a state in which waste vinyl or microplastics are mixed together, and the waste vinyl or microplastics put in in this way floats inside the anaerobic digester 100, and is moved by the rotation of the stirrer 400. In the process of moving, when it reaches the floating material collection screw 500, it is moved by the floating material collection screw 500 and discharged to the outside.

As described above, the floating material collection screw 500 discharges and removes waste vinyl or microplastics that are not conducive to the production of biogas to the outside, thereby increasing the productivity of biogas.

On the other hand, the biogas generated inside the anaerobic digester 100 is discharged through the gas outlet 122 and stored in a gas storage tank (not shown).

In addition, sludge or contaminants among organic wastes that are no longer decomposed in the anaerobic digester 100 are discharged through the first discharge pipe 111 , and the digestion liquid is discharged through the second discharge pipe 112 .

The present invention is to induce the smooth discharge of biogas generated in the anaerobic digestion process as the stirrer 400 arranged side by side inside the anaerobic digestion tank 100 removes scum and destroys the oil layer while stirring the organic waste. Since the transfer screw 300 installed in the longitudinal direction of the anaerobic digester 100 can induce sufficient decomposition by contact with microorganisms in the process of transferring the organic waste from the lower side to the upper side, the undecomposed organic matter It is possible to increase the production of biogas by improving the decomposition efficiency of waste.

In particular, in the process in which the organic waste is transported by the transfer screw 300, the organic waste and the microorganism freely pass through the hole 210 of the perforated pipe 200 and come into contact with each other, thereby inducing the smooth decomposition of the undecomposed organic waste. This can be done, and thus there is an advantage in that the productivity of biogas can be increased.

3 is a view showing a second embodiment of the vertical anaerobic digestion apparatus for organic waste treatment according to the present invention, which will be described with reference to the following.

The second embodiment is generally the same as the first embodiment, except that the first pump P1 and the centrifugal dehydrator 600 are further reinforced in the configuration of the first embodiment.

The first pump P1 serves to pressurize the digestive fluid discharged through the upper outlet, that is, the second outlet 112 to the centrifugal dehydrator 600 .

The centrifugal dehydrator 600 serves to centrifuge the digestive fluid pumped by the first pump P1 and discharge it to the purification facility.

4 is a view showing a third embodiment of the vertical anaerobic digestion apparatus for organic waste treatment according to the present invention, which will be described with reference to the following.

The third embodiment is generally the same as the first embodiment, except that the first pump P1, the centrifugal dehydrator 600, and the second pump P2 are further reinforced in the configuration of the first embodiment.

The first pump P1 serves to pressurize the sediment (sludge and impurities among organic wastes) discharged through the lower outlet, that is, the first discharge pipe 111 to the centrifugal dehydrator 600 .

The centrifugal dehydrator 600 serves to centrifuge the sediment (sludge and contaminants among organic wastes) pumped by the first pump P1 to separate the liquid phase.

The second pump (P2) serves to pump the liquid separated from the centrifugal dehydrator (600) and return it to the inlet (121).

As described above, the sediment (sludge and contaminants in organic waste) discharged through the first outlet 111 is pumped to the centrifugal dehydrator 600 through the first pump P1, and the pressurized sediment (sludge and contaminants in organic waste) Contaminants) is centrifuged in the centrifugal dehydrator 600, and then the liquid phase is pumped through the second pump P2 as a medium and flows back into the anaerobic digester 100, thereby increasing the production efficiency of biogas.

[Experimental example]

6 is a graph measuring the methane generation efficiency of a vertical vertical anaerobic digestion apparatus for organic waste treatment according to a third embodiment of the present invention. As a control of the present invention, Korean Patent Registration No. 10-1209133 is applied. compared to the invention.

First, the capacity of the constricted digester is 100 tons of each of the present invention and the control, and the input raw material having 30% of food wastewater and 70% of livestock manure is input under the condition that the internal temperature is 36°C to 40°C, and then the residence time of 40 days The amount of methane gas generated for 180 days was measured in each state.

As a result of the measurement, the present invention produced an average of 2.61 L/d of methane per day for 180 days, whereas the control group produced an average of 1.8 L/d of methane per day for 180 days.

Through this experiment, it was confirmed that the methane generation efficiency of the present invention was improved by 44.4% compared to the control, and accordingly, it was confirmed that the technology of the present invention was significantly superior to that of the control.

Although the present invention has been described in detail only with respect to the specific embodiments described, it is natural for those skilled in the art that various changes and modifications can be made within the technical spirit of the present invention, and it is natural that such variations and modifications belong to the appended claims.

Claims

anaerobic digester;

a perforated pipe installed in the longitudinal direction of the anaerobic digester to be positioned between the center and the inner circumferential surface of the anaerobic digester, the perforated pipe having a perforated surface on the outer circumferential surface so that organic waste can freely pass;

Vertical vertical anaerobic digestion apparatus for organic waste treatment, characterized in that it includes; a transfer screw installed in the perforated pipe to transfer the sediment from the bottom to the top so that the undecomposed organic waste can be decomposed in the process of being transported.
According to claim 1,

Inside the anaerobic digester, the anaerobic digester and the anaerobic digester are installed side by side in a direction perpendicular to the upper and lower parts to remove the scum, destroy the oil layer, and a stirrer for agitating the organic waste is further reinforced; characterized in that Vertical anaerobic digestion system for organic waste treatment.
3. The method of claim 1 or 2,

The inner bottom of the anaerobic digester is formed to be inclined downward toward the lower end of the perforated pipe; Vertical vertical anaerobic digestion apparatus for organic waste treatment, characterized in that.
3. The method of claim 1 or 2,

The inside of the anaerobic digester is heated by a hot water pipe installed on the inner circumferential surface; vertical anaerobic digestion apparatus for organic waste treatment, characterized in that.
3. The method of claim 1 or 2,

A vertical cylindrical anaerobic digestion device for organic waste treatment, characterized in that the upper part of the outer circumferential surface of the anaerobic digester is further provided with a screw for collecting suspended matter to be able to discharge the suspended matter to the outside.
3. The method of claim 1 or 2,

a first pump for pressurizing the extinguishing liquid discharged through the upper outlet;

And further comprising a centrifugal dehydrator for discharging the digested liquid pressurized by the first pump to a purification facility after centrifugation; vertical anaerobic digestion apparatus for organic waste treatment, characterized in that.
3. The method of claim 1 or 2,

a first pump for pressurizing the sediment discharged through the lower outlet;

a centrifugal dehydrator for separating the liquid phase by centrifuging the sediment pumped by the first pump;

Vertically cylindrical anaerobic digestion apparatus for organic waste treatment, characterized in that; further comprising a second pump for conveying the liquid separated from the centrifugal dehydrator to the inlet by pressure.