KR101202444B1 - Anaerobic digestion device having scum blade - Google Patents

Abstract

PURPOSE: An anaerobic digesting apparatus is provided to be additionally installed to an existing anaerobic digesting apparatus by supporting the loads of a stirrer, a scum blade, and a driving part using an integrated internal partition. CONSTITUTION: An anaerobic digesting apparatus(100) includes a cylindrical body part(110), an integrated internal partition(120), a stirrer(140), a scum blade(150), and a driving part(130). The body part receives digesting fluid. The integrated internal partition is formed from the center bottom to the upper side of the body part. An upper through hole(124) and a lower through hole(122) are arranged at the upper part and the lower part of the internal partition. The stirrer is formed in the internal partition. The scum blade is formed at a height which corresponds to the upper though hole of the internal partition in order to induce scum on the surface of the digesting fluid into the upper through hole of the internal partition. The scum blade is spirally extended to the external side of the body part. The driving part is formed at the upper part of the internal partition.

Description

Integrated anaerobic digestion apparatus with scum occurrence suppression apparatus and agitation function and its method {ANAEROBIC DIGESTION DEVICE HAVING SCUM BLADE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anaerobic digestion apparatus and method for treating organic wastes such as food waste and livestock manure. More particularly, the present invention relates to an integrated anaerobic digestion apparatus that suppresses scum generation and has a scum discharge function.

Due to climate warming, interest in resource recycling of organic waste is increasing, and interest and demonstration facilities for purifying methane (CH ₄ ) gas generated through anaerobic digestion and using it as energy are operating.

In anaerobic digestion, the agitation of the sludge mixes the existing anaerobic digester sludge containing a large amount of anaerobic digester microorganisms present in the anaerobic digester with the newly introduced concentrated sludge to bring the anaerobic digester microorganism into contact with the newly introduced sludge. In addition to promoting digestion, it is very important to prevent sediment from occurring in the anaerobic digester.

In the anaerobic digester, there are a method of using a digestive gas and a method of using a mechanical stirrer. A method of using a digestive gas having a simple structure is widely used.

In the case of agitation using digestion gas, the agitation efficiency is excellent, but there is a problem that it is difficult to manage because of a large amount of scum, and in the case of general mechanical agitation, there is a limitation that uniform mixing is not performed well.

In the method using the digestion gas, the digestion gas is blown into the anaerobic digester by using a high pressure blower and mixed by mixing the sludge in the anaerobic digester by using the disturbance generated when the gas floats the sludge layer in the anaerobic digester.

As the stirring method using digestion gas, a method of intensively ejecting digestive gas from the lower center of the anaerobic digester and a method of sequentially ejecting digestive gas from various places in the anaerobic digester are used. Depending on the method, sludge in the anaerobic digester is used. It is difficult to completely mix in the anaerobic digester with high concentration such that the agitation is incomplete and there is a test result that there is a dead zone where more than 60% of the anaerobic digester is not stirred.

In addition, high pressure gas compressors and gas circulation piping are required for agitation of anaerobic digestion tanks by extinguishing gas, and care must be taken in maintenance because gas leakage may cause an explosion in the compressor or piping.

Conventional agitation apparatus using digestive gas causes the digestive gas to be intensively ejected from the central bottom portion of the anaerobic digester so that the anaerobic digester sludge rises from the bottom of the inside of the anaerobic digester and descends again by the floating force. The main cause of action. However, in this method, when the concentration of anaerobic digester sludge increases, the viscosity of the anaerobic digester sludge also increases, so that the up and down circulation of the sludge is not good, and congestion occurs easily, and as a result, the amount of methane generated is very low.

However, in recent years, since most of the centrifuges are used to concentrate the sludge, the concentration of the concentrated sludge is 4 to 6%. Is difficult.

As another method, a gas ejection pipe is installed in various places in an anaerobic digester, and a gas is ejected and stirred at the same time. This method requires a large amount of extinguishing gas to be supplied. It is economical. Alternatively, the installation of gas outlet pipes in various places in the anaerobic digester is the same as described above, but the gas is supplied from one gas outlet tube at a time by supplying the digestion gas in turn. In some cases, a method has been used in which the required amount of extinguishing gas is supplied so as to produce a good stirring effect.

Although these methods have a relatively good agitation effect, there is still a possibility of stagnation between the gas ejection pipes installed at various places, which makes it difficult to locate the gas ejection pipe and increases the number of gas ejection pipes. There is a problem that it is difficult to prevent the gas leakage of the distribution device for sequentially supplying gas to each gas ejection pipe.

Therefore, in recent years, the method of stirring the sludge is changing from the method of using the digestion gas to the method of using a mechanical stirring device.

However, in the case of the mechanical stirring device, the stirring blade must be formed largely to improve the stirring efficiency. The stirring blade cannot be formed to cover the entire area due to the strength of the stirring shaft and the frictional force generated during the driving, so that a small area of the central part is usually small. It was formed in a size to cover. When the area covered by the stirring blade was smaller than the total cross-sectional area, the flow was weak and it was difficult to expect a complete circulation effect.

Scum generated in the upper part of the digester is a cause of lowering the amount of gas generated, and affects the downstream water treatment during discharge. Existing anaerobic digestion tank has a separate scum discharge part, but the discharge effect is insignificant, and there is a safety problem due to the contained gas leakage.

In addition, when a mechanical stirrer is installed in the existing anaerobic digester, there is a problem in the structural safety of the facility due to the aging of the existing facility, and a separate arch holder such as an arch type should be installed.

Related prior art is the Republic of Korea Patent Registration No. 10-0972219 dated July 19, 2010 by the present applicant 'an anaerobic digestion apparatus and method having a complete circulation function with an integrated inner partition and sparse stirrer'.

An object of the present invention is to provide an integrated anaerobic digestion apparatus for minimizing the generation of scum and ensuring ease of scum discharge by mixing the structure and the generated scum by stirring to prevent the accumulation of scum on the surface of the digestive fluid.

Another object of the present invention is to provide an anaerobic digestion apparatus that can be applied to an existing anaerobic digester by integrally supporting the load of an agitator, scum blade, and driving unit to which an integral inner partition is added.

Still another object of the present invention is to provide an anaerobic digestion apparatus that can easily discharge scum generated in the extinguishing apparatus to the outside.

The present invention is a cylindrical body portion for receiving a digestive fluid therein; An integral internal partition wall formed at a center of the body part from a bottom surface to an upper surface of the body part, and having an upper through hole and a lower through hole at upper and lower portions thereof, respectively; An agitator formed inside the integrated inner partition wall; A scum blade which pivots around the integral inner partition wall and guides the scum on the surface of the extinguishing liquid into the integral inner partition wall; And a driving unit supported by the integrated inner partition and driving the stirrer and the scum blade.

The scum blade is formed in a spiral shape surrounding the integrated inner partition wall and extending to the outside of the body portion.

The scum blade is preferably connected to the driving unit through a ring gear formed on the outer peripheral surface of the integrated inner partition wall.

In addition, the anaerobic digestion apparatus according to the present invention includes an scum discharge pipe having an inlet formed inside the integrated inner partition, an outlet formed outside the body portion, and a discharge valve for controlling a flow rate discharged from the scum discharge pipe, It is desirable to have a scum discharge function.

At this time, the inlet of the scum discharge pipe is preferably formed at a lower height than the scum blade.

In addition, the stirrer circulates the extinguishing liquid flows into the upper through hole and discharges to the lower through hole, and the driving unit is formed of a stirrer and each motor for rotating the scum blade, or the stirrer and the scum blade are one motor. It can be configured to rotate.

The anaerobic digestion apparatus according to the present invention has the effect of suppressing the generation of scum and reducing the problems caused by the generation of scum by crushing or discharging the generated scum to the outside.

In addition, the anaerobic digestion apparatus according to the present invention has an effect that can be installed without affecting the stability of the structure of the existing anaerobic digestion apparatus by allowing the integral internal partition to support the load of the stirrer, scum blade, the driving unit.

1 is a cross-sectional view showing the structure of the anaerobic digestion apparatus having a scum discharge function to prevent scum generation according to an embodiment of the present invention;
2 is a cross-sectional view for explaining a scum discharge pipe of the anaerobic digestion apparatus having a scum discharge function to prevent scum generation according to an embodiment of the present invention;
Figure 3 is a plan view showing a scum blade of the anaerobic digestion apparatus having a scum discharge function to prevent scum generation according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the anaerobic digestion apparatus and method having a complete circulation function with the integral inner partition and gas-circulating sparging stirrer according to the present invention.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a cross-sectional view showing the structure of the anaerobic digestion apparatus to prevent scum generation and having a scum discharge function according to an embodiment of the present invention.

In anaerobic digestion, many drivers must remain in proper condition. This is one of the most important factors, especially in the mixed state.

The mixed state should keep the biological end product uniform through continuous contact of microorganisms and organics, and smooth digestion by suppressing the occurrence of scum generated by mixing. In addition, it is necessary to maintain a uniform temperature in the digester and smoothly extinguish by minimizing the dispersion concentration throughout the digester through mixing when toxic substances are introduced.

The present invention provides an anaerobic digestion apparatus having a function of preventing scum from occurring on the surface of the small liquid and discharging the scum to the outside.

Anaerobic digestion apparatus 100 according to the present invention is formed in a cylindrical body portion 110 for receiving a digestive fluid therein, from the bottom surface to the upper surface of the body portion in the center of the body portion 110, the upper and lower portions respectively The integral inner partition 120 having a through hole 124 and the lower through hole 122, the stirrer 140 formed inside the integral inner partition wall, and the periphery of the integral inner partition 120, A scum blade 150 for guiding the scum on the surface of the extinguishing fluid into the integrated internal partition wall 120, and a driving unit supported by the integrated internal partition wall 120 and driving the stirrer 140 and the scum blade 150. 130.

In the integral inner bulkhead 120, the expression integral means that the structure is connected to the structure so as to support the load. Therefore, even if the integral internal partition wall 120 is formed by some division, if the structure has a structure capable of supporting the load as a whole, it corresponds to the integrated internal partition wall 120 meaning in the present invention.

Body portion 110 has a closed cylindrical shape for receiving the digestive fluid, and has an injection port (not shown) for injecting the digestive fluid and an extraction port (not shown) for discharging the treated digestive fluid. The extinguishing liquid is stored in the body 110 to maintain a constant temperature and agitate to proceed with digestion.

An integrated inner partition 120 is formed at the center of the body 110. The integrated inner partition wall 120 is formed in a cylindrical shape in the vertical direction, and has an upper through hole 124 near the digestive liquid storage level, and a lower through hole 122 near the bottom. The space inside the body part 110 is divided into the integrated internal partition 120 and the integrated internal partition 120 through the integrated internal partition 120.

In the present invention, the integrated internal partition wall 120 is formed to penetrate the top and bottom of the body portion 110. This is to transfer the load of the integrated internal partition wall 120 to the bottom of the body portion 110, the integrated internal partition wall 120 is stably supported, so as not to interfere with the load of the body portion 110.

The integrated internal partition wall 120 is formed as an independent structure that is integrally connected to support vertical loads, and the driving unit 130 is installed at the upper end of the integrated internal partition wall 120. The drive unit 130 is a component for supplying rotational power to the stirrer 140 and the scum blade 150, including a mechanical device such as a motor, a gearset, etc., and the load of the drive unit 130 is integrated into the internal partition wall 120. By supporting this, the influence of the load of the driving unit 130 on the body 110 structure is minimized.

The integrated inner bulkhead structure 120 is to improve the anaerobic digestion tank that has been installed in the present invention, while using the body portion 110 structure as it is, the integrated inner bulkhead 120, agitator 140, scum blade 150 ), Allows the driver 130 to be installed.

The body part 110 structure is often aging. At this time, if the additional load of the integral internal partition 120, the stirrer 140, the scum blade 150, the driving part 130 is transferred to the body part, the stability of the body part 110 is achieved. In this case, the structure of the present invention does not affect the stability of the body portion 110 structure because the load of the additional facility is transferred to the bottom surface by the integral internal partition wall 120.

An agitator 140 including a stirring shaft 142 and a stirring blade 144 is disposed inside the integrated internal partition wall 120, and the agitator 140 is rotated by the driving unit 130.

The stirrer 140 operates to pump the digestion liquid downward in the integrated internal partition wall 120, whereby the digestive fluid flows into the upper through hole 124 of the integrated internal partition wall 120 and moves downward. It has a flow discharged to the lower through hole 122 of the partition wall (120).

Even if the extinguishing liquid has such a flow, scum occurs and accumulates on the surface of the extinguishing liquid.

The present invention includes a scum blade 150 for guiding the scum generated on the surface of the extinguishing fluid into the integrated internal partition wall 120.

The scum blade 150 is installed to pivot the surface of the extinguishing fluid, and the scum of the surface is guided into the integral inner partition wall by turning the scum blade 150, and is crushed by the stirrer or the body through the scum discharge pipe 160 which will be described later. It is discharged to the outside portion 110.

The scum blade 150 receives power from the driving unit 130 described above.

As shown in the drawing, the driving unit 130 may be formed of a first driving motor 132 for rotating the stirrer 140 and a second driving motor 134 for rotating the scum blade 150.

However, one motor or one engine may be used as the power source, and power may be supplied to the stirrer 140 and the scum blade 150 by using a transmission means such as a gear chain.

The scum blade 150 needs to rotate the outside of the integrated internal partition wall. As described above, the integrated internal partition wall is integrally formed to support the driving unit 130. Accordingly, the scum blade 150 may be connected to the driving unit through a ring gear 155 formed on the outer circumferential surface of the integrated inner partition wall 120.

2 is a cross-sectional view for explaining a scum discharge pipe of the anaerobic digestion apparatus having a scum discharge function to prevent scum generation according to an embodiment of the present invention.

As described above, the present invention has a configuration in which scum generated on the surface of the digestive fluid is guided to the inside of the integrated inner partition. The scum induced by the integral inner partition may be pulverized by the stirrer and circulated with the extinguishing liquid, or may be deposited inside the integral inner partition.

The present invention is provided with a scum discharge pipe 160 for discharging scum collected inside the integrated inner partition wall to the outside. The scum discharge pipe 160 has an inlet formed inside the integrated internal partition wall 120 and an outlet is formed outside the body part 110. At this time, the inlet is preferably disposed at a height lower than the scum blade 150 in the surface portion of the digestive fluid, the outlet 164 is preferably formed at a position lower than the inlet 162. This is to avoid interference between the scum discharge pipe 160 and the scum blade 150, so that the discharge of scum can be naturally drained by the pressure difference. In addition, the scum discharge pipe 160 is provided with a discharge valve 170 for adjusting the flow rate of the scum discharged from the scum discharge pipe 160.

The scum discharge pipe 160 is formed in a shape in which the upper portion is opened in the internal section of the integral internal partition wall 120, and preferably has a closed tubular shape in the external section of the integrated internal partition wall 120. This is to facilitate the introduction of scum in the integrated internal partition wall 120 and to increase the discharge effect. The scum discharge pipe 160 in the internal section of the integrated inner partition wall 120 may be formed in the form of a polygonal tube having an upper surface of a cross-section of a U-shaped, semi-circular or the like.

The discharge valve 170 may be an automatic valve type in which scum discharge and discharge flow rate are controlled according to the flow rate, or may be a manual type in which a driver may check the state of the fire extinguishing device and adjust the discharge flow rate.

3 is a plan view showing a scum blade of the anaerobic digestion apparatus having a scum discharge function to prevent scum generation according to an embodiment of the present invention.

As shown, the scum blade 150 is formed in a spiral shape surrounding the integrated internal partition wall 120 and extending to the outside of the body portion. When the scum blade 150 is rotated in the counterclockwise direction as shown in the figure, the scum of the surface of the digestive fluid is guided to the upper through-hole 124 of the integrated inner partition wall 120 along the inner surface of the scum blade 150. Arrows indicated by point islands in the drawing indicate an approximate guide direction of scum, and arrows indicated by double lines indicate a rotation direction of scum blades 150.

In the illustrated embodiment, two scum blades 150 are provided, but three or more scum blades 150 may be provided.

The scum guided in this way is discharged to the outside of the body 110 through the scum discharge pipe 160 positioned below the scum blade 150, or pulverized by the stirring blade 142.

As described above, the anaerobic digestion apparatus according to the present invention forms an integral inner partition within the body portion, and by placing an agitator inside the integral inner partition, the upper extinguishing fluid flows into the integral inner partition, and then Discharge down, disperse, and then back up.

In addition, by using the scum blade scum generated in the surface portion of the extinguishing fluid is moved inside the integral inner partition wall and the scum is mixed with the extinguishing liquid to suppress the generation of scum, and some of the generated scum is discharged controlled by a water gauge (not shown) By discharging to the scum discharge pipe 160 through the valve, it brings the effect of reducing the operational problems due to scum generation. The level gauge detects the level of the digestive fluid, and the scum floats on the surface. When the digestive fluid is out of the proper level, the scum is not discharged to the scum discharge pipe 160, and only the digestive fluid may be discharged. It is desirable to allow the discharge valve to be adjusted accordingly.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

100: anaerobic digester
110:
120: integrated internal bulkhead
130: drive unit
140: Stirrer
150: scum blade
160: scum exhaust pipe
170: discharge valve

Claims (5)

A cylindrical body portion for receiving a digestive fluid therein;
An integral inner partition wall formed at a center of the body portion from a bottom surface to an upper surface of the body portion, and having an upper through hole and a lower through hole at upper and lower portions thereof, respectively;
An agitator formed inside the integrated inner partition wall;
It is formed at a height corresponding to the upper through hole so as to pivot around the integral inner partition and guide the scum of the surface of the digestive fluid into the upper through hole of the integral inner partition wall to surround the integral inner partition wall and to the outside of the body part. A scum blade extending in a spiral shape; And
And a driving part formed on an upper portion of the integrated inner partition wall and driven by the integrated inner partition wall to drive the stirrer and the scum blade.
The scum blade is anaerobic digestion apparatus, characterized in that connected to the drive through a ring gear formed on the outer peripheral surface of the inner partition.
delete delete The method of claim 1,
A scum discharge pipe having an inlet formed inside the integrated inner partition and an outlet formed outside the body part; And
Anaerobic digestion apparatus further comprises; a discharge valve for adjusting the flow rate discharged from the scum discharge pipe.
The method of claim 4, wherein
The entrance of the scum discharge pipe is
Anaerobic digestion apparatus, characterized in that formed at a lower height than the scum blade.

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