WO2011087265A2

WO2011087265A2 - Anaerobic digester

Info

Publication number: WO2011087265A2
Application number: PCT/KR2011/000206
Authority: WO
Inventors: 김태화
Original assignee: 벽산엔지니어링주식회사; 김보경
Priority date: 2010-01-14
Filing date: 2011-01-12
Publication date: 2011-07-21
Also published as: WO2011087265A3; KR100957554B1

Abstract

The present invention relates to an anaerobic digester and provides an anaerobic digester comprising: a digester body unit; an inclined plate which is provided on the inside of the digester body unit and is formed with a through hole; a pump which is provided on the outside of the digester body unit; a discharge pipe for discharging waste water on the inside of the digester body to the outside by means of the pump; a discharge-pipe opening-and-closing valve for carrying out the action of opening and closing the discharge pipe; a first inflow pipe for making the waste water, which has been discharged through the discharge pipe, flow into the digester body unit; a first opening and closing valve for carrying out the action of opening and closing the first inflow pipe; a stabilising partition wall which is formed on the inside of the digester body unit; and a media layer to which are attached micro-organisms on the inside of the digester body unit. When the present invention is employed, stirring on the inside of the anaerobic digester can be carried out appropriately and hence it is possible to prevent the production of sediment to the maximum extent, and it is possible to reduce the management and upkeep costs and improve the operating efficiency of anaerobic digesters.

Description

Anaerobic digester

The present invention relates to an anaerobic digester, and more particularly, to an anaerobic digester capable of effectively preventing the formation of sediment accumulated in the anaerobic digester, and effectively preventing the outflow of microorganisms and stabilizing the effluent. .

In general, anaerobic digestion refers to decomposing organic wastewater into methane gas by decomposing anaerobic microorganisms by introducing various organic wastewaters such as food waste stripping liquid and manure into a closed tank. In other words, the tank containing the organic wastewater to treat this process is called anaerobic digester. These anaerobic digesters continue to accumulate sediments, such as lime, bone powder, and fiber, as they elapse over time after installation, and these deposits gradually solidify from the bottom of the digester to solidify and occupy space within the digester. Reduce the processing capacity. In addition, when the time elapses, the stacked sediment is often collapsed toward the bottom of the digester, thereby blocking the external outlet installed in the bottom of the digester, which hinders the normal operation of the digester.

In order to solve this problem, to prevent the formation of sediment in the anaerobic digester by constructing the bottom of the digester in the shape of an inclined funnel or by installing a stirrer to agitate the waste water in the digester through a stirrer using a pump There are several ways to do this. These conventional anaerobic digesters can perform a certain amount of agitation, but the installation and maintenance is difficult and the agitation function is decayed over time. It still has its limitations in that cleaning must be done. Therefore, the inventor of the present patent application invented an anaerobic digestion tank to solve the problems of the anaerobic digestion tank having a conventional stirring function as a Korean Patent Application No. 10-2009-0060510 (anaerobic digestion tank having a function to prevent the formation of precipitates). It has been filed.

Figure 1 shows a cross-sectional view of the anaerobic digester disclosed in the patent application, the anaerobic digester 100 of Figure 1 is a discharge pipe 13 and the first inlet pipe 15 installed in the lower portion outside the digester body portion 10 And while circulating the waste water by the pump 12 through the second inlet pipe 17, the waste water is led to the bottom of the digester by the inclined plate 11 installed inside the digester body portion 10, the first inlet pipe The main feature of the (15) is to make a circulating flow of the waste water by the appropriate opening and closing operation to perform the stirring function to prevent the sediment generated in the lower side of the digester (100).

The anaerobic digester of Figure 1 has the advantage that it can operate very efficiently in terms of agitation function. However, the anaerobic digester disclosed in the patent application has another problem of the anaerobic digester, that is, the problem that the rate of microorganisms in the digester with the effluent discharged from the digester is high. In addition, the conventional anaerobic digester is automatically discharged according to the digester capacity after a certain period of time in the digester, there was a relatively lacking stabilization function in the digester. Therefore, it is desired to develop an anaerobic digester capable of appropriately performing the stirring function and at the same time preventing the outflow of microorganisms from the digester and performing a stabilizing function.

The present invention has been made in view of the above problems, it is possible to properly perform the stirring function in the anaerobic digestion tank, by suppressing the discharge of microorganisms in the digestion tank with the effluent and by stabilizing the effluent discharged from the digester It is an object of the present invention to provide an anaerobic digester capable of minimizing the aftertreatment process facility connected to an anaerobic digester and significantly reducing sludge production.

In order to solve the above problems, the present invention includes a digester body portion having a wastewater inlet pipe into which wastewater is introduced and a discharge pipe through which the digested filtrate is treated; An inclined plate which is installed inside the digester body and has a through hole formed at a central portion thereof to allow wastewater to move within the digester body; A pump installed outside the digester body; A discharge pipe installed extending in the lower portion of the inclined plate and suctioning and discharging wastewater inside the digester body by an operation of the pump; A discharge pipe open / close valve configured to open and close the discharge pipe; A first inlet pipe connected to an upper portion of a digester body part and introducing wastewater discharged through the discharge pipe into the digester body part through an upper portion of the digester body part; A first open / close valve configured to open and close the first inlet pipe; A stabilization partition wall configured to partition a predetermined area inside the digester body part from another area in the digester body part; And a media layer installed in an area partitioned by the stabilization partition wall to which microorganisms are attached inside the digester body, wherein discharge of wastewater through the discharge pipe is controlled by opening or closing the discharge pipe opening / closing valve. Wastewater discharged through the discharge pipe by the opening or closing operation of the first opening / closing valve is introduced into the first inflow pipe, and the discharge pipe of the digester body part is formed in an area partitioned by the media layer and the stabilization barrier. It provides an anaerobic digester having a function of preventing deposit generation, characterized in that disposed in the digestion zone.

Here, the stabilizing partition is formed so as to be spaced apart from the surface of the inclined plate, it may be formed so that the digestive filtrate therein communicates through the spaced apart.

In addition, at least one second through-hole may be formed in the inclined plate below the area partitioned by the stabilization barrier.

In addition, the media layer may be arranged to be inclined at least one or more of the attachment material to be attached to the plate-like microorganisms.

In addition, a second inlet pipe extending into the lower portion of the inclined plate in the digester body portion, the wastewater discharged through the discharge pipe into the digester body portion by the operation of the pump; And it may be configured to further include a second on-off valve for performing the opening and closing operations of the second inlet pipe.

According to the present invention, the agitation in the anaerobic digestion tank can be properly made, thereby preventing the generation of precipitate as much as possible, and reducing the management and maintenance costs of the anaerobic digestion tank and improving the working efficiency.

In addition, according to the present invention, it is possible to suppress the discharge of microorganisms in the effluent flowing out of the anaerobic digester, so that it is possible to minimize the process such as concentration of microorganisms at the rear end of the digester, thus reducing the overall management cost. It has an effect.

In addition, according to the present invention, since the effluent can be stabilized in the anaerobic digester, the efficiency of wastewater treatment can be increased.

1 is a cross-sectional view of the anaerobic digester disclosed in Republic of Korea Patent Application No. 10-2009-0060510 (anaerobic digester having a function of preventing the formation of precipitates).

2 is a cross-sectional view of an anaerobic digester according to an embodiment of the present invention.

3 is a plan view showing an example of an inclined plate.

Figure 4 shows an example of a plan view of the digester body portion is installed stabilizing partitions.

5 is a diagram illustrating an example of a media layer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 shows a cross-sectional view of the anaerobic digester according to an embodiment of the present invention.

The anaerobic digester of the embodiment of FIG. 2 is similar in basic form to the anaerobic digester described in FIG. 1, but compared with the anaerobic digester of FIG. 1, as described below, the stabilization partition 22 and the media layer 23 are formed. The biggest difference is that it is.

2, the anaerobic digester 100 of FIG. 2 includes a digester body part 10 including a wastewater inlet tube 19 through which wastewater is introduced and a digestion filtrate discharge tube 20 through which a treated digestion filtrate is discharged. The digester body part 10 by the operation of the inclined plate 11 installed inside the digester body part 10, the pump 12 installed outside the digester body part 10, and the pump 12. A discharge pipe 13 for suctioning and discharging the internal wastewater to the outside, a discharge pipe opening / closing valve 14 for opening and closing the discharge pipe 13 and a wastewater discharged through the discharge pipe 13 A first inlet pipe 17 through which the digester body part 10 is introduced into the digester body part, a first opening / closing valve 18 for opening and closing the first inlet pipe 17; Wastewater discharged through the discharge pipe 13 is introduced into the digester body part 10 by the operation of the pump 12. It is similar to the anaerobic digester of FIG. 1 in that it includes a second inlet pipe 15 for inflow and a second open / close valve 16 for performing the opening and closing operations of the second inlet pipe 15. In addition, the anaerobic digester of FIG. 2 is partitioned by the stabilizing partition 22 and the stabilizing partition 22 formed so as to partition a predetermined area inside the digester body 10 from another area within the digester body 10. It is installed in the area further includes a media layer 23 to which the microorganisms inside the digester body portion 10 is attached. On the other hand, the second inlet pipe 15 and the second opening and closing valve 16 for controlling it may be omitted.

In the anaerobic digestion tank 100 having such a configuration, the discharge of wastewater through the discharge pipe 13 is controlled by the opening or closing operation of the discharge pipe opening and closing valve 14, and the first and / or second opening and closing valve ( The wastewater discharged through the discharge pipe 13 by the opening or closing operation of 16 and 18 flows into the first and / or

second inlet pipes

15 and 17 to perform a stirring function, and the stabilizing partition wall (22) performs a stabilization function by partitioning a predetermined area within the digester body (10) and at the same time prevents the outflow of microorganisms by the media layer (23) disposed in the area partitioned by the stabilization partition (22). It will perform the function.

The digester body portion 10 is generally formed in a cylindrical shape of about 10 to 15m in diameter and 20 to 45m in height, but is not limited thereto. The digester body 10 may be freely formed according to the needs of the installation location and capacity. The digester body portion 10 is connected to the wastewater inlet pipe 19 through which the wastewater flows in the middle portion thereof, and the digestion filtrate discharge pipe 20 through which the digested filtrate is treated. The wastewater inlet pipe 19 in FIG. 1 is installed on the upper side of the digester body part 10 and extends to the bottom of the digester body part 10, but the wastewater inlet pipe 19 in FIG. 10) The difference is that it is installed in the middle part. However, this difference is a configuration that can be freely selected by those skilled in the art and does not particularly affect the present invention. Organic wastewater such as livestock waste, food waste desorption fluid, etc. are introduced through the wastewater inflow pipe 19, and the digested filtrate, which has been processed through the digestion filtrate discharge pipe 20, is stored in an external storage tank or a secondary treatment facility. Will be discharged. The cover of the digester body portion 10 is generally formed with a gas discharge pipe for discharging the gas generated from the waste water, such as methane gas. The waste water inlet pipe 19 is extended so that the end thereof is located above the through-hole 111 of the inclined portion 11 to be described later, the digestion filtrate discharge pipe 20 is located on the top of the digester body portion 10, It is provided above the media layer 23 in the area partitioned by one stabilization partition 22 to discharge the digested filtrate passing through the media layer 23 to the outside.

The inclined plate 11 is installed slightly below the middle part of the digester body 10. 3 illustrates an example of a plan view of the inclined plate 11, and referring to FIGS. 2 and 3, the inclined plate 11 is the same as the internal shape of the digester body part 10 to be tightly fixed to the inner wall of the digester body part 10. It can be seen that it is formed in the form. For example, when the inner surface of the digester body 10 is cylindrical, the inclined plate 11 is also formed in a circular shape. 2 and 3 it can be seen that the circular funnel shape. In the center of the inclined plate 11 is formed a through-hole 111 to move the waste water inside the digester body portion 10. The inclined plate 11 is formed to be inclined downwardly from the inner surface of the digester body portion 10 toward the through hole 111. In addition, at least one gas circulation through-hole 112 is formed at the edge of the inclined plate 11 to allow the gas generated from the lower end of the digester body 10 to circulate. The through hole 111 of the inclined plate 11 has an extension 113 protruding downwardly so that the wastewater above the inclined plate 11 can be better guided downward. 3, at least one second through hole 112-1 is formed on the surface of the region of the inclined plate 11 corresponding to the region partitioned by the stabilization barrier 22. Fire extinguishing filtrate and gas at the bottom of the inside can be communicated with the area partitioned by the stabilizing partition 22 through it.

On the other hand, the pump 12 is installed outside the digester body portion 10, as described later to suck out the waste water from the inside of the digester body portion 10 through the discharge pipe 13 to the first inlet pipe 17 and And / or circulating wastewater into the digester body portion 10 through the second inlet pipe 15.

A discharge pipe 13 is installed below the inclined plate 11 for suctioning and discharging wastewater inside the digester body part 10 by the operation of the pump 12, and the discharge pipe 13 is disposed in the discharge pipe 13. A discharge pipe open / close valve 14 is installed to perform opening and closing operations of h). The discharge pipe 13 is preferably connected to the digester body portion 10 in a position close to the bottom of the digester body portion 10.

In addition, a second inflow pipe 15 is formed inside the inclined plate 11 inside the digester body part 10, and the second inflow pipe 15 pumps wastewater discharged through the discharge pipe 13. By the operation of (12) is to circulate into the digester body 10. The second inlet pipe 15 is also provided with a second open / close valve 16 for performing opening and closing operations. The second inflow pipe 15 and the second opening / closing valve 16 again introduce the discharged water discharged from the body portion 10 to the lower side of the digester body portion 10 to stir by aeration from the lower portion of the body portion 10. In order to perform the function, the specific configuration and operation is the same as in the anaerobic digester of Figure 1, so the detailed description is omitted, and for details, refer to Patent Application No. 10-2009-0060510 for the anaerobic digester of Figure 1 do. In addition, as mentioned above, the 2nd inflow pipe 15 and the 2nd opening / closing valve 16 may be abbreviate | omitted and comprised.

In addition, the upper side of the digester body portion 10, the first inlet pipe 17 for introducing the wastewater discharged through the discharge pipe 13 to the inside through the upper portion of the digester body portion 10 is disposed. The first inlet pipe 17 is also provided with a first open / close valve 18 for carrying out its opening and closing operations. The first inlet pipe 17 is connected to the discharge pipe 13 and the waste water discharged from the discharge pipe 13 by the pump 12 when the first open / close valve 18 is opened, the upper part of the digester body 10 It moves to the circulation tank through the upper part of the digester body portion 10 and operates to circulate into the body. Since the specific configuration and operation of the first inlet pipe 17 and the first opening / closing valve 18 are also substantially the same as those of the anaerobic digester of FIG. 1, a detailed description thereof will be omitted.

The digester 100 of such a configuration is operated by the operation of each valve as a whole. That is, the opening or closing of the discharge pipe 13 is performed by the operation of the discharge pipe opening / closing valve 14, and the second inlet pipe 15 is opened by the second opening / closing valve 16 and the first opening / closing valve 18. And opening or closing of the first inlet pipe 17. The operation of these valves may be configured to be automatically performed by a controller set in advance for circulation of the digester 100, or may be configured to be opened and closed by a manual operation of the operator. The operation of the valves is independent of each other and can be operated to close some of them and open some as desired, whereby a stirring action is made within the digester body part 10.

On the other hand, a second inclined plate 21 may be additionally formed at the bottom of the digester body portion 10, which is a central portion of the bottom of the digester body portion 10 for the flow of wastewater flowing from the second inlet pipe 15. It is in the form inclined downward toward the center of the bottom portion to guide to, and also the same as the configuration in the anaerobic digester of Figure 1, detailed description thereof will be omitted.

On the other hand, the stabilizing partition 22 is formed so as to partition a predetermined region inside the digester body portion from the other region in the digester body portion 10, whereby the partitioned digestion filtrate inside the digester body portion 10 It will function to stabilize before discharging to the outside. Figure 4 shows an example of a plan view of the digester body portion 10, the stabilization bulkhead 22 is installed, as shown in Figure 4, the stabilization partition 22 is coupled to the inner wall of the digester body portion 10 is fixed As shown in FIG. 2, the upper side extends upward from the maximum water surface of the digestive filtrate and the lower side extends at a predetermined interval so as not to contact the upper surface of the inclined plate 11. Through the spaced apart from the surface of the inclined plate 11 it is possible to communicate with other areas of the digester body portion 10 and wastewater or gas therein. The stabilizing partition 22 is not limited to the shape as shown in FIG. 4, and may be formed in a "c" shape as shown in FIG. 3. If necessary, it may be formed in the form of a semi-circle or arc, and the important thing is that a certain area can be divided into other areas.

Meanwhile, the media layer 23 is for preventing the microorganisms contained in the wastewater inside the digester body part 10 from being discharged through the discharge pipe 20 by the flow of the wastewater, for example, as shown in FIG. 5. can do. Referring to FIG. 5, the attachment member 231 capable of attaching microorganisms in the form of a plate may be formed in two stages arranged side by side to be inclined at about 45 degrees when viewed from the front. When the microorganism is floated by the flow of wastewater from the inside of the digester body 10 to the upper by the media layer 23, the microorganism is discharged to the outside because it adheres to the surface of the attachment material of the media layer 23. It can perform a function to prevent it. This is because when the microorganisms continuously adhere to the surface of the attachment member 231, the microorganisms form agglomerates, and when the agglomerates having a certain size or more are formed, the microorganisms fall under the digester body part 10 by its weight. It is used. The attachment material 231 is formed of a material having such a property that microorganisms can easily stick to each other. For example, the attachment material 231 may be formed of a PVC material, a plastic material, a stainless material, or the like. In addition, the shape of the media layer 23 is not limited to the form shown in FIG. 5 and can be configured in various other forms. As a specific configuration of the media layer 23, various media layers known in the art may be used as it is.

Next, operation | movement of the digester 100 of the above structure is demonstrated. First, the stirring operation of the anaerobic digester 100 is performed as follows, which is basically similar to the anaerobic digester of FIG. 1. When the wastewater flows in from the outside through the wastewater inflow pipe 19, the incoming wastewater flows into the digester body part 10 through the end of the wastewater inflow pipe 19 located above the through hole 111 of the inclined plate 11. Inflow. The wastewater flowing in flows down the inclined plate 11 through the through hole 111 without flowing upward through the inclined plate 11 by the inclined plate 11. At this time, when the pump 12 is driven and the discharge pipe open / close valve 14 is opened, the wastewater located below the inclined plate 11 through the discharge pipe 13 is sucked out to the outside of the digester body part 10 and discharged. The wastewaters are allowed to flow into the second inlet pipe 15 and / or the first inlet pipe 17 by opening / closing the second on / off valve 16 and / or the first on / off valve 18. Waste water may be introduced simultaneously into the first inlet pipe 15 and the second inlet pipe 17 or only one of them, and this control is achieved by the control of the

valves

16 and 18.

Waste water flowing into the second inflow pipe 15 is dispersed and introduced into the digester body portion 10 below the inclined plate 11 through the branch pipe 151 as described above, and flows into the first inflow pipe 17. Inflowing wastewater is introduced into the digester body portion 10 above. Wastewater introduced through the second inflow pipe 15 is distributed and discharged from the lower side of the digester body portion 10 through the branch pipe 151, and then, from the bottom of the inclined plate 11 toward the bottom of the digester body portion 10 by a kind of detonation action. Since the flow is made, it is possible to prevent the production of sediment precipitated on the bottom of the digester body portion 10. At this time, since the flow to the upper part of the digester body portion 10 by the inclined plate 11 is almost blocked, it is possible to create a continuous circulation flow under the inclined plate 11. When the discharge pipe 13 and the second inlet pipe 15 are continuously circulated and operated, the continuous circulating fluid flow is repeated under the inclined plate 11 inside the digester body part 10 and the sediment is deposited by the bottom. This can prevent the stacking on the side.

Wastewater introduced into the first inlet pipe 17 by the opening of the first opening / closing valve 18 is introduced into the digester body part 10 through the upper part of the digester body part 10. Wastewater flowing through is located on the upper side of the digester body portion 10, but as described above by the inclined plate 11 and the through-hole 111 and the extension portion 113 by the fluid flow in the lower portion of the digester body portion 10 Digestion tank body 10 is slowly flowed down. On the other hand, gas such as methane gas is generated below the digester body portion 10, the gas is discharged through the gas discharge pipe of the cover portion as described above, the gas generated from the digester body portion 10 below the inclined plate ( 11 is raised through the gas circulation through-hole 112 formed at the edge of the digester body portion 10 and is discharged through the gas discharge pipe. By repeating such a process, the digester 100 gradually decomposes various wastewater into stable digestive filtrate and methane gas, and the treated digestive filtrate is transferred to the storage tank or the secondary treatment facility through the digestive filtrate discharge pipe 20. Will be discharged.

On the other hand, the stabilization function and the microbial outflow prevention operation by the stabilization barrier 22 and the media layer 23 is performed as follows.

As described above, while the stirring operation is performed, the waste water is circulated inside the digester body 10, and a microbial bed layer is formed in which the microorganisms are mainly distributed in the lower side of the inside. The wastewater in the digester body part 10 is circulated while partially moving to the area partitioned by the stabilization barrier 22 through a passage between the lower end of the stabilization barrier 22 and the inclined plate 11. Wastewater moving to the area partitioned by the stabilization barrier 22 is formed to flow upward by the pressure and the flow of the wastewater, and at this time, some of the microorganisms mainly included in the bed of the microorganism also move upward. As described above by the media layer 23, the microorganisms adhere to the media layer 23, and only the remaining waste water except the microorganisms moves upward through the media layer 23 and through the discharge pipe 20 formed thereon. It will be discharged to the outside. As described above, the microorganisms attached to the media layer 23 form agglomerates, and when the microorganisms have a certain size, the microorganisms fall down again by the weight of the microorganisms to form the microbial bed layer again. The microorganisms contained therein can be maintained at the appropriate concentration as much as possible.

In addition, the wastewater contained in the area partitioned by the stabilization partition 22 can be stabilized in a state separated from the other areas inside the digester body portion 10, so that the stabilization function in the step before being discharged to outside You can do it smoothly.

The present invention has been described above with reference to the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and Modifications will be possible. Therefore, the present invention should be construed with reference to the overall description of the appended claims and drawings, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

Claims

A digester body portion having a wastewater inlet pipe into which wastewater is introduced and a discharge pipe through which the digested filtrate is treated;

An inclined plate which is installed inside the digester body and has a through hole formed at a central portion thereof to allow wastewater to move within the digester body;

A pump installed outside the digester body;

A discharge pipe installed extending in the lower portion of the inclined plate and suctioning and discharging wastewater inside the digester body by an operation of the pump;

A discharge pipe open / close valve configured to open and close the discharge pipe;

A first inlet pipe connected to an upper portion of a digester body part and introducing wastewater discharged through the discharge pipe into the digester body part through an upper portion of the digester body part;

A first open / close valve configured to open and close the first inlet pipe;

A stabilization partition wall configured to partition a predetermined area inside the digester body part from another area in the digester body part; And

Media layer is installed in the area partitioned by the stabilization partition wall is attached to the microorganism inside the digester body

Including;

The discharge of wastewater through the discharge pipe is controlled by the opening or closing operation of the discharge pipe opening / closing valve, and the wastewater discharged through the discharge pipe by the opening or closing operation of the first opening / closing valve is controlled by the first inlet pipe. Will flow into

The exhaust pipe of the digester body portion is anaerobic digestion tank having a sediment generation prevention function, characterized in that disposed in the digestion zone of the area partitioned by the media layer and the stabilizing partition.
The method of claim 1,

The stabilizing partition is formed to be spaced apart from the surface of the inclined plate, anaerobic digestion tank characterized in that the digestive filtrate is formed to communicate through the spaced intervals.
The method of claim 1,

At least one second through-hole is formed in the inclined plate below the area partitioned by the stabilizing partition wall anaerobic digester.
The method of claim 1,

The media layer is an anaerobic digester characterized in that the plate is arranged to be inclined at least one or more inclined to allow the microorganism to be attached.
The method of claim 1,

A second inlet pipe extending into the lower portion of the inclined plate in the digester body and introducing wastewater discharged through the discharge pipe into the digester body by an operation of the pump; And

A second open / close valve configured to open and close the second inflow pipe

Anaerobic digester, characterized in that it further comprises.