KR101812449B1 - Anaerobic biogas distribution apparatus for treating food wastewater - Google Patents

Abstract

The present invention relates to an anaerobic biogas distribution device for food wastewater. The device includes: an acid fermenting tank fermenting food wastewater with acid; a plurality of methane fermenting tanks connected to the downstream side of the acid fermenting tank to ferment the food wastewater which has been fermented in the acid fermenting tank; a plurality of gas storage tanks connected to the downstream side of each of the methane fermenting tanks to stabilize the fermented food wastewater and store biogas; and a distributing part installed between the methane fermenting tanks and the gas storage tanks to distribute the biogas generated from the methane fermenting tanks.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an anaerobic biogas-

The present invention relates to an anaerobic biogas distributing apparatus for negative wastewater, and more particularly, to an anaerobic biogas distributing apparatus for treating biogas generated in an anaerobic digestion process for treating negative wastewater.

Generally, an anaerobic digestion process is a process of reducing the amount and volume of waste by decomposing various organic wastes such as food waste, negative wastewater, livestock manure, wastewater, etc., or wastewater into methane and carbon dioxide by anaerobic microorganisms.

These anaerobic digestion processes include a hydrolysis process, an acid fermentation process and a methane fermentation process. Conventional anaerobic digestion processes often use a single-phase methane fermentation tank that performs both an acid fermentation process and a methane fermentation process in one reaction tank In recent years, however, the acid fermentation process and the methane fermentation process have been separated from each other and the processes have been separately performed in separate reaction vessels.

In the conventional anaerobic digestion process of the prior art documents 1 to 3, the organic wastes and wastewater are decomposed by the anaerobic microorganisms in the methane fermentation tank to generate methane gas, and the treated effluent is discharged to the outside of the methane fermentation tank .

The effluent discharged from the methane fermentation tank of the conventional anaerobic digestion process is converted into anaerobic microorganisms through the methane fermentation process of the organic wastes and the organic substances such as wastewater. Theoretically, when the anaerobic microorganisms leach out of the methane fermentation tank, The microbes must be proliferated through the treatment of wastewater or wastewater. However, the amount of microbes in the methane fermentation tank tends to increase more than the amount of microbes to proliferate.

Therefore, in the long term, there is a problem that the overall treatment efficiency of the anaerobic digestion process may be gradually reduced.

In addition, in the conventional anaerobic digestion apparatus, the amount of biogas discharged from the methane fermentation tank to the gas storage tank of the anaerobic digestion tank is uneven, so that it is difficult to control the discharge amount of the biogas, and the biogas stored during the digestion tank agitation is intermittently discharged There was a problem to be done.

In addition, there is a problem that the level difference of the gas due to the individual transfer of the discharged biogas occurs, and it is difficult to block the flow of the biogas during the maintenance of the gas reservoir, thereby lowering the overall treatment efficiency of the anaerobic digestion process.

International Publication No. WO2012 / 074289 (hereinafter referred to as 'Prior Art 4') discloses a method for maximizing fermentation efficacy, comprising an acidic fermentation tank and a vortex generating means in a methane fermentation tank and an agitator by means of an organic waste treatment apparatus and treatment method.

However, in the invention of the prior art document 4, the fermentation efficiency is maximized and the methane production is increased. However, the gas storage tank storing only the gas storage tank is composed of only one methane gas generated from the acid fermentation tank and the methane fermentation tank.

Korean Patent Publication No. 10-1184555 (hereinafter referred to as "Prior Art 5") discloses a method for producing a gas using a hydrogen fermentation tank and methane fermentation tank as a continuous hydrogen and methane recovery apparatus from food waste.

However, the invention of the prior art document 5 requires only a gas reservoir because it generates only hydrogen gas in the hydrogen fermenter and produces only methane gas in the methane fermenter, and the stabilizer tank only requires stabilization and solid-liquid separation of the methane fermentation solution, .

In addition, it is difficult to treat the methane gas produced in proportion to the increase of the amount of the wastewater by using only the gas reservoirs of the prior arts 4 and 5, and in addition, The burden on the installation cost and the operating cost is increased.

<Prior Art Literature>

Prior Art 1: Korean Patent Publication No. 10-2011-0046813

Prior Art 2: Korean Patent Registration No. 10-1272243

Prior Art 3: Korean Patent Registration No. 10-1368459

Prior Art 4: International Publication No. WO2012 / 074289

Prior Art 5: Korean Patent Registration No. 10-1184555

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a method for improving biogas treatment performance by maintaining the storage level of the gas storage tank parallel to each other, It is an object of the present invention to provide an anaerobic biogas distribution apparatus for negative wastewater capable of buffering instantaneous pressure.

In addition, the present invention provides a stable biogas supply by keeping the stored water level of the gas storage tank evenly, and it is also possible to provide an anaerobic biogas distribution of the wastewater that can improve the operation efficiency of maintenance of the gas storage tank by the shut- It is another object to provide a device.

In order to accomplish the above object, the present invention provides an acid fermentation tank (20) for acidic wastewater treatment; A plurality of methane fermentation tanks (30) connected downstream of the acid fermentation tank (20) and fermenting acidic fermented wastewater from the acid fermentation tank (20) to methane fermentation; A plurality of gas storage vessels (40) connected to the downstream of the methane fermentation tank (30) to stabilize the methane fermented wastewater in the methane fermentation tank (30) and store the biogas; And a distributor 60 disposed between the methane fermentation tank 30 and the gas storage tank 40 to distribute the biogas produced in the methane fermentation tank 30.

The distribution unit (60) of the present invention includes a plurality of connection piping connected between the methane fermentation tank (30) and the gas storage tank (40) so as to correspond to each other; A plurality of shutoff valves respectively provided on the plurality of connection pipes; And a distribution pipe installed upstream of the shut-off valve and installed to communicate all of the plurality of connection pipes; And a control unit.

The shutoff valve of the present invention is characterized by comparing the stored water levels of the respective gas storage tanks (40) so as to control the gas flow rate so that the stored water levels are kept parallel to each other.

The distribution pipe of the present invention is formed to be two to three times larger than the size of the connection pipe so as to buffer the instantaneous pressure of the connection pipe at the time of stirring by the water head difference in the methane fermentation tank 30. [

The anaerobic biogas distribution device for the negative wastewater comprises an acid fermentation tank (20) for acid fermenting the wastewater; A stabilized digestion tank for anaerobic digestion of acidic fermented wastewater in the acid fermentation tank 20; A gas storage tank (40) connected to the stabilization digester to store biogas generated in the stabilization digester; And a negative wastewater distributor (70) installed between the acid fermentation tank (20) and the stabilization digester, for distributing negative wastewater treated by acid fermentation to a stabilization digester without passing through a methane fermentation tank (30) .

The stabilized digester is characterized in that the waste wastewater treated in the methane fermentation tank (30) is introduced to stabilize or decompose residual organic matter.

The wastewater to be fed to the stabilization digester can be either volatile fatty acid (VFA) or pH depending on the main operating factors of volatile fatty acid (VFA) or pH, depending on the seasonal import quality and quantity of total solid (TS), volatile solid (VS) or total nitrogen Or the input amount of the waste water is regulated according to the maintenance of the dredging facility.

In addition, the waste water flowing into the stabilization digester is stored for 7 to 12 days and is operated at 35 to 45 ° C.

The gas reservoir 40 is composed of an inner membrane and an outer membrane, and the operating pressure is maintained at 0.5 to 3.5 mbar.

The waste water distribution unit 70 includes a connection pipe 71 connected in series between the acid fermentation tank 20 and the stabilization digester; A negative wastewater transfer pump 72 installed in parallel between the acid fermentation tank 20 and the stabilization digester; A distribution pipe 73 installed upstream of the negative waste water inlet automatic valve 74 and connected to a plurality of connection pipes; A negative wastewater supply automatic valve 74 installed in the connection pipe for regulating the inflow amount of the negative wastewater flowing from the acid fermentation tank 20; Or the like is selected and installed.

The connection pipe (71) may be provided with at least one of the pressure measuring means (75) and the flow rate measuring means (76).

Further, the connecting pipe 71 is maintained at 0.8 to 1.0 mbar.

As described above, according to the present invention, a distribution unit is provided between the methane fermentation tank and the gas storage tank to distribute the biogas produced in the methane fermentation tank to the gas storage tank, thereby maintaining the storage level of the gas storage tank parallel to each other, The present invention provides an effect that the momentary pressure of the connecting pipe can be buffered in the methane fermentation tank while stirring by the water head.

Further, since the connection pipe, the shutoff valve and the distribution pipe are provided as the distribution portions, the stored water levels of the gas storage tanks are maintained to be equal to each other, and stable biogas can be supplied. Of the present invention.

FIG. 1 is a block diagram showing a wastewater anaerobic biogas dispensing apparatus of the present invention.
2 is a configuration diagram showing a wastewater anaerobic biogas dispensing apparatus of the present invention.
3 is a configuration diagram showing an anaerobic biogas dispensing apparatus according to a second embodiment of the present invention.
FIG. 4 is a flow chart for analyzing the amount of gas produced after the anaerobic biogas distributing device for the wastewater according to the present invention.
<Description of Symbols>
10: Well waste water reservoir; 11: a first reservoir; 12: Second storage tank
20: acid fermentation tank; 21: primary acid fermentation digester; 22: Second acid fermentation digester;
30: methane fermentation tank; 31: first methane fermentation digester; 32: a second methane fermentation digester; 33: Third methane fermentation digester;
40: gas storage tank; 41: a first biogas storage tank; 42: a second biogas storage tank; 43: a third biogas storage tank;
50: Biological desulfurization facility
60: distribution portion; 61: connection piping; 61a: first connection pipe; 61b: second connection pipe; 61c: third connection pipe; 62: shutoff valve; 62a: a first shut-off valve; 62b: a second shut-off valve; 62c: a third shut-off valve; 63: Distribution piping;
70: Waste water distribution part; 71: Connection piping; 71a: first connection pipe; 71b: second connection pipe; 71c: third connection piping; 72: Waste water transfer pump; 72a: first feed pump; 72b: second transfer pump; 73: Distribution piping; 74: Waste water input automatic valve; 74a: a first automatic valve; 74b: a second automatic valve; 74c: third automatic valve; 75: pressure measuring means; 76: flow rate measuring means;

Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to the embodiments disclosed herein, but may be embodied in other forms. The embodiments disclosed herein are provided so that those skilled in the art can fully understand the spirit of the present invention. Therefore, it should be understood that the present invention should not be limited by the following embodiments, and all transformations included in the technical idea and technical scope of the present invention are included.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. The sizes of the elements or the relative sizes between the elements in the figures may be exaggerated somewhat for a clear understanding of the invention. Further, the shape of the elements shown in the drawings may be somewhat modified by variations in the manufacturing process or the like. Accordingly, the embodiments disclosed herein should not be construed as limited to the shapes shown in the drawings unless specifically stated, and should be understood to include some modifications.

On the contrary, the various embodiments of the present invention can be combined with any other embodiments as long as there is no clear counterpoint. Any feature that is specifically or advantageously indicated as being advantageous may be combined with any other feature or feature that is indicated as being preferred or advantageous.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

&Lt; Example 1 >

FIG. 1 is a block diagram showing a wastewater anaerobic biogas dispensing apparatus according to the present invention, and FIG. 2 is a view illustrating a wastewater anaerobic biogas dispensing apparatus according to the present invention.

As shown in Figs. 1 and 2, the anaerobic biogas dispensing apparatus for the wastewater according to the first embodiment includes a waste water storage tank 10; An acid fermentation tank 20; A methane fermentation tank 30; A gas storage tank 40; An anaerobic biogas distributor including a biological desulfurization facility (50) and a distributor (60) for distributing the biogas produced in the anaerobic digestion fixation of the wastewater to be stored.

The wastewater storage tank 10 is a storage tank for storing negative wastewater flowing in from the outside and is composed of a plurality of storage means such as a first storage tank 11 and a second storage tank 12 and is suitably changed depending on the inflow amount of the incoming wastewater. And stored.

The main components of the wastewater introduced in the present invention include carbohydrates, proteins, fats and the like.

The capacity of the waste water storage tank 10 may be 530 to 570 m ³ , and the standard is 15,000 m in length, 7,000 m in width, and 7,400 m in height. The material is composed of RC (Reinforced Concrete) and acidic epoxy But is not limited thereto.

In addition, at least one of the negative waste water storage tank 10 may be installed, and preferably two negative waste water storage tanks 10 may be provided, but may be changed according to the embodiments of the present invention.

Further, the waste water flowing into the waste water storage tank 10 can be retained for 1 to 3 days, preferably for 2 days, but is not limited thereto.

The retention time of the waste water storage tank may be increased or decreased by 1 to 2 days depending on the environment of the waste water storage tank depending on the season or the weather.

It is needless to say that filtering means such as a drum screen is provided upstream of the negative waste water storage tank 10 so that foreign matter or impurities contained in the waste water can be primarily filtered by the filtering means and then stored.

The acid fermentation tank 20 is a digester for fermenting acidic wastewater introduced from the negative wastewater storage tank 10 for storing negative wastewater. The first acid fermentation digestion tank 21 and the second acid fermentation digestion tank 22 are provided with a plurality It is an anaerobic digestion tank in which acidic fermentation microorganisms are cultured in a high concentration of negative wastewater and acidic fermentation of the wastewater is carried out.

The main components of the wastewater introduced in the present invention include monosaccharides, amino acids, fatty acids and the like. These organic substances are produced by propionic acid, butyric acid, and acetic acid through acid fermentation, And hydrolyzed.

The capacity of the acid fermentation tank 20 may be 800 to 815 m ³ , and the standard may be 10,611 m in height and 11,000 m in diameter. The material may be SS 400 and acid-resistant epoxy, but is not limited thereto.

In addition, at least one acid fermentation tank 20 may be installed, and preferably two, may be provided, but may be changed according to the embodiments of the present invention.

The acid fermentation tank 20 is an anaerobic digestion tank for acidic fermentation digestion of the wastewater introduced from the outside. The acid fermentation tank 20 is a digestion tank having a pH of about 5 to 7, Or a high temperature extinguishing temperature of about 50 to 58 占 폚.

In addition, the wastewater flowing into the acid fermentation tank 20 can stay for 1 to 5 days, preferably for 2 to 4 days, and most preferably for 3 days, but is not limited thereto.

The residence time of acid fermentation tank can be increased or decreased by 2 ~ 3 days depending on the environment around the acid fermentation tank depending on the season or the weather.

It goes without saying that if the acid fermentation tank 20 is heated to a suitable temperature through the heating means and the acid fermentation proceeds, the fluidity can be improved and maintained in a state suitable for methane fermentation.

The methane fermentation tank 30 is a digester that is connected to the downstream of the acid fermentation tank 20 and ferments acidic fermentation-treated wastewater in the acid fermentation tank 20 to methane. The methane fermentation tank 30 is connected to the first methane fermentation digester 31, And a third methane fermentation digestion tank 33. The anaerobic digestion tank is an anaerobic digestion tank in which methane fermentation microorganisms are cultured in the negative wastewater discharged from the acid fermentation tank 20 and the waste wastewater is methane fermented.

The wastewater flowing into the methane fermentation tank 30 is subjected to an acid fermentation process and contains propionic acid, butyric acid, and acetic acid. The organic matter is fermented to produce 62% of methane, 0.2% of hydrogen sulfide, and 37.8% of carbon dioxide, .

In addition, the capacity of the methane fermentation tank 30 may be 4,000 m ³ , and the standard is 18,310 m in height and 19,036 m in diameter. The material may be composed of SS400 (12t, 14t, 16t, 18t) and acidic epoxy , But is not limited thereto.

Further, at least one methane fermentation tank 30 may be installed, and preferably three methane fermentation tanks 30 may be provided, but may vary according to the embodiments of the present invention.

The first to third methane fermentation digestion tanks 31, 32, and 33 are digester tanks in which methane fermentation digestion processing is performed by flowing the negative wastewater treated in the acid fermentation tank 20. In the anaerobic acid fermentation of the wastewater, The degradation by microorganisms is optimized in the range of 5 to 7, and the methane fermentation optimizes the decomposition by the microorganism at the pH of about 7 to 8.5. Therefore, the pH of the methane fermentation in the methane fermentation tank (30) Is maintained.

In addition, the wastewater flowing into the methane fermentation tank 30 can stay for 21 to 28 days, preferably 22 to 26 days, and most preferably for 24 days, but is not limited thereto.

The residence time of the methane fermenter may be increased or decreased by 2 to 4 days depending on the season or the weather, depending on the environment of the methane fermenter.

The gas storage tank 40 is connected to the downstream of the methane fermentation tank 30 so as to stabilize the methane fermented wastewater in the methane fermentation tank 30 and store the biogas. A second biogas storage tank 42, a third biogas storage tank 43, and the like.

Also, the gas reservoir 40 is composed of an inner membrane and an outer membrane, and it is best to maintain a pressure of 0.5 to 3.5 mbar.

That is, the first biogas storage tank 41 is connected to correspond to the first methane fermentation digestion tank 31, the second biogas storage tank 42 is connected to correspond to the second methane fermentation digestion tank 32, The biogas storage tank 43 is connected to correspond to the third methane fermentation digestion tank 33.

The gas storage tank 40 may have a capacity of 1,200 m ^{3. The} material of the gas storage tank 40 may be polyethylene (PE) or a special coating (M / B). However, the present invention is not limited thereto.

Further, at least one gas reservoir 40 may be provided, and preferably three gas reservoirs 40 may be provided, but may vary according to embodiments of the present invention.

The gas storage tank 40 is connected to the methane fermentation tank 30 to store the biogas such as methane and the like stored in the reservoir tank 40. The storage tank 40 is provided with a stabilized digester, .

In addition, the capacity of the stabilization digester may be 1,500 m ³ , and the standard is 6,900 m in height and 21,000 m in diameter. The material may be composed of RC and acidic epoxy, but is not limited thereto.

Further, at least one stabilization digester may be installed, and preferably three stabilization digesters may be installed, but they may vary according to the embodiments of the person skilled in the art.

The stabilized digestion tank is preferably a digestion tank for stabilizing the methane fermentation-treated negative wastewater in the methane fermentation tank (30), and an agitator for agitating the negative wastewater flowing into the stabilized digestion tank is preferably provided.

In addition, it is also possible to concentrate the anaerobic microorganisms contained in the effluent discharged through the anaerobic digestion process, stabilize the anaerobic microorganisms, and supply the stabilized digestion tank to the anaerobic digestion process.

In this stabilization digester, a heating means is provided to be used as a temperature control means for keeping the internal temperature of the stabilization digester constant, so that it can be maintained at a middle temperature of about 35 to 38 DEG C or about 50 to 58 DEG C It is preferable to keep it at the high temperature extinguishing temperature.

The biological desulfurization facility 50 is connected to the downstream of the gas storage tank 40 to purify the biogas by removing contaminants such as sulfur and moisture contained in the biogas. The desulfurization facility 50 includes a wet desulfurizer, , A gas dehumidifier, and the like.

In the wet desulfurizer, the sulfur component contained in the biogas discharged from the anaerobic digestion process is washed and cleaned with the washing water, and the water eliminator collides the biogas discharged from the wet type desulfurizer to the partition wall to condense the moisture, In the gas dehumidifier, the biogas that has passed through the water eliminator is cooled by a heat exchange method, and water contained in the biogas is condensed to separate and remove moisture.

The distribution portion 60 is a distributing means provided between the methane fermentation tank 30 and the gas storage tank 40 for distributing the biogas generated in the methane fermentation tank 30 to the gas storage tank 40, 61, a shutoff valve 62, and a distribution pipe 63.

The connection pipe 61 is a connection member connected between the methane fermentation tank 30 and the gas reservoir 40 so as to correspond to each other and is connected to the first connection pipe 61a, the second connection pipe 61b, (61c), and the like.

That is, the first connection pipe 61a is connected between the first biogas storage tank 41 and the first methane fermentation digestion tank 31, the second connection pipe 61b is connected to the second biogas storage tank 42, And the third connection pipe 61c is connected between the third biogas storage tank 43 and the third methane fermentation digestion tank 33. The third methane fermentation digestion tank 33 is connected to the second methane fermentation digestion tank 32,

The shutoff valve 62 is provided on the connection pipe 61 to control the inflow amount of the biogas introduced from the methane fermentation tank 30 or to block the inflow of the biogas. A second shut-off valve 62b, and a third shut-off valve 62c.

That is, the first shutoff valve 62a is provided in the first connection pipe 61a, the second shutoff valve 62b is provided in the second connection pipe 61b, and the third shutoff valve 62c And is provided in the third connection pipe 61c.

It is preferable that the shutoff valve 62 controls the opening and closing of the respective connecting pipes 61 so as to adjust the gas flow rate so that the storage water levels are kept parallel to each other by comparing the storage water levels of the respective gas storage tanks 40.

The distribution pipe 63 is provided upstream of the shut-off valve 62 and is provided to distribute the input amount of the biogas through the plurality of connection pipes 61. The first connection pipe 61a, The amount of the biogas to be supplied to the connection pipe 61b and the third connection pipe 61c is maintained equally.

The distribution pipe 63 is formed to be two to three times larger than the diameter of the connection pipe 61 so as to buffer the instantaneous pressure of the connection pipe 61 in the methane fermentation tank 30 during stirring by the water head difference .

This is because if the diameter of the distribution pipe 63 is smaller than twice the diameter of the connection pipe 61, the buffering performance against the instantaneous pressure of the connection pipe 61 is lowered, and the diameter of the distribution pipe 63 Is larger than three times the diameter of the connecting pipe 61, the buffering performance is improved, but the manufacturing cost and the installation cost are excessively increased and the economical efficiency is lowered.

As described above, according to the present invention, a distribution unit is provided between the methane fermentation tank and the gas storage tank to distribute the biogas generated in the methane fermentation tank to the gas storage tank, respectively, so that the storage levels of the gas storage tank are maintained parallel to each other, The present invention provides an effect that the momentary pressure of the connecting pipe can be buffered in the methane fermentation tank while stirring by the water head.

Further, since the connection pipe, the shutoff valve and the distribution pipe are provided as the distribution portions, the stored water levels of the gas storage tanks are maintained to be equal to each other, and stable biogas can be supplied. Of the present invention.

&Lt; Example 2 >

The wastewater anaerobic biogas distributing apparatus of the first embodiment may further include a negative wastewater distributor 70.

3 is a configuration diagram showing an anaerobic biogas dispensing apparatus according to a second embodiment of the present invention.

The negative wastewater distributor 70 is installed between the acid fermentation tank 20 and the stabilized digester disposed below the gas storage tank 40 so that the acidic fermented wastewater is distributed to the stabilization digester without passing through the methane fermentation tank 30. [ A negative wastewater transfer pump 72, a distribution pipe 73 or a negative wastewater supply automatic valve 74 may be selected and installed as a distribution means for directly transferring the wastewater to the main body Do not.

The stabilized digester is designed to decompose the residual organic matter in the methane fermentation tank 30 and has a structure capable of anaerobic digestion in the same manner as the methane fermentation tank 30. This structure enables anaerobic digestion even if the wastewater from the acid fermentation tank 20 subjected to acid fermentation treatment (about 33 tons per series) is directly fed to the stabilization digester without passing through the methane fermentation tank 30.

Also, the stabilized digester can introduce the wastewater treated in the methane fermentation tank 30, stabilize the incoming wastewater, or decompose residual organic matter of the wastewater.

In addition, the waste water to be added to the stabilized digestion tank can be adjusted flexibly according to the operation factors such as VFA, pH, etc., depending on seasonal import quality and quantity of TS, VS, TN, etc. And it can process up to 600 tons / day when importing the design standard water quality.

In the present invention, a plurality of stabilization digesters may be provided, such as the stabilized digester A, the stabilized digester B, and the stabilized digester C, but may be changed according to the embodiments of the present invention.

In addition, the wastewater flowing into the stabilization digester can stay for 7 to 12 days, preferably 8 to 10 days, and most preferably for 9 days. The residence time may vary depending on season or weather, It can be added or subtracted by 2 ~ 3 days.

Further, the stabilization digester may be operated at 35 to 42 ° C for anaerobic digestion, preferably at 37 to 40 ° C, and the stabilization digester operation temperature may be increased or decreased by 1 to 3 ° C depending on the season or the weather .

This is due to the fact that the use of stabilized digester without the increase of operating cost causes problems such as a sharp increase of volatile fatty acid and total solid material compared with that before the relaxation of the harvesting amount of the drinking water wastewater is increased, Also increased.

The gas storage tank 40 can store the biogas such as methane generated by the anaerobic digestion of the waste water of the stabilization digester, and the first biogas storage tank 41; The second biogas storage tank 42, the third biogas storage tank 43, and the like may be provided, but they may be changed according to the embodiments of those skilled in the art.

The gas storage tank 40 is composed of an inner membrane and an outer membrane. The operating pressure of the membrane is 0.5 to 3.5 mbar, and the normal leakage amount is 1 m ³ * 1 bar * 1 L / day.

The first biogas storage tank 41 is connected to the stabilized digester B, the second biogas storage tank 42 is connected to the stabilization digester B and the third biogas storage tank 43 is connected to the stabilization digester C .

In addition, the biogas can stay in the gas storage tank 40 for 1 to 5 hours, but is not limited thereto.

The connection pipe 71 is a piping member connected in series between the acid fermentation tank 20 and the stabilization digester. The negative wastewater flows through the acid fermentation tank 20 without passing through the methane fermentation tank 30, A plurality of connection pipes such as the first connection pipe 71a, the second connection pipe 71b and the third connection pipe 71c may be provided as a transfer pipe capable of directly injecting the wastewater into the stabilization digester, &Lt; / RTI &gt;

The first connection pipe 71a is connected to the stabilized digester A, the second connection pipe 71b is connected to the stabilization digester B, and the third connection pipe 71c is connected to the stabilization digester C.

In addition, it is best that the connection pipe 71 use a 100A transfer pipe to inject about 100 tons of waste water.

Furthermore, at least one of the pressure measuring means 75 and the flow rate measuring means 76 may be installed in the connecting pipe 71, but the present invention is not limited thereto.

The pressure measuring means 75 is installed downstream of the negative wastewater transfer pump 72 and measures the pressure of the connection wastewater 71 by measuring the pressure of the connection wastewater 71 to adjust the amount of the wastewater to be supplied to the stabilization digester Can be introduced. Such negative wastewater control can regulate the amount of biogas produced in the stabilization digester.

In addition, the pressure of the connecting pipe 71 is maintained at 0.8-1.0 mbar, preferably 0.9 mbar, but it may vary according to the embodiments of the person skilled in the art.

The flow rate measuring means 76 is installed downstream of the negative wastewater transfer pump 72 to measure the amount of negative wastewater flowing through the connection pipe 71. Thus, the amount of negative wastewater flowing into the stabilization digester can be controlled by measuring the amount of negative wastewater.

The negative wastewater transfer pump 72 is provided in parallel between the acid fermentation tank 20 and the stabilization digester and is a pumping means for transferring the negative wastewater from the acid fermentation tank 20 to the stabilization digestion tank 20. The first feed pump 72a and the second feed A plurality of feed pumps, such as a pump 72b, may be provided, but may vary according to embodiments of those skilled in the art.

The first transfer pump 72a is connected to the first acid fermentation digestion tank 21 and the second transfer pump 72b is connected to the second acid fermentation digestion tank 22. [

The distribution pipe 73 is provided upstream of the negative wastewater inlet automatic valve 74 and is connected to the first connection pipe 71a by distributing means for distributing the input amount of the negative wastewater by communicating the at least one connection pipe 71, , The second connection pipe (71b), and the third connection pipe (71c).

In addition, the amount of the negative wastewater flowing into the stabilization digester can be changed depending on whether the automatic drain valve for waste water introduction 74 is opened or closed.

Further, in the present invention, since the distribution piping 73 is installed, the problems such as the increase of the amount of the wastewater fed or the reduction of the design throughput due to the increase of the organic load due to the relaxation of the loading standard can be anaerobically extinguished in the stabilized digester. . This has the effect of stably treating the increased negative waste water and reducing the operating cost.

Furthermore, as the amount of waste wastewater is increased, the production of gas is maximized, resulting in an annual profit of 200 million won.

The automatic wastewater inlet automatic valve 74 is an opening and closing means provided in the connection pipe 71 for controlling the inflow amount of the wastewater flowing into the acid fermentation tank 20 or blocking the inflow of the wastewater, 74a, the second automatic valve 74b, the third automatic valve 74c, and the like, but may be changed according to the embodiments of the present invention.

The first automatic valve 74a is provided in the first connection pipe 71a and the second automatic valve 74b is provided in the second connection pipe 71b and the third automatic valve 74c is provided in the third connection pipe 71b. And is installed in the connection pipe 71c.

The automatic wastewater inlet automatic valve 74 can control the opening and closing of the respective connection pipes 71 so as to adjust the inflow amount of the wastewater so that the storage water levels are kept parallel to each other by comparing the storage water levels of the respective stabilization digesters, Biogas production can be distributed through wastewater inflow control.

In addition, when the biogas is calculated as 50 Nm ³ / ton * 100 ton / day, the effect of the production of 5,000 Nm ³ / day is shown, and the methane content accounts for 60%.

<Experimental Example 1>

The wastewater anaerobic biogas distribution system was operated on the basis of the above <Example 2>.

The waste water treated in the acid fermentation tank 20 flows into the stabilization digester through the waste water transfer pump 72.

The first transfer pump 72a was operated at 27 Hz of PV and the SP was operated at 30 Hz and the second transfer pump 72b was operated at 0 Hz of PV and 40 Hz of SP.

Pressure connection pipe 71 is 0.9mbar, and the negative of the total waste water amount and 6,066m ³ each sound wastewater 5.6m by ³ to the distribution pipe 73 has been introduced. At this time, the set value (count set) was set to 0.5.

The wastewater flows through the connection pipe 71, the distribution pipe 73, and the connection pipe 71a, 71b, 71c to the stabilization digester. At this time, a negative waste water inlet automatic valve 74 is provided in each connection pipe.

In addition, the amount of the wastewater flowing into each connecting pipe was confirmed. The first connection pipe 71a is 2,199 m ³ in total, the second connection pipe 71 ^b is 2,113 m ³ in total, The total of the third connecting pipe 71c was 2,105 m ³ .

The wastewater from the first connection pipe 71a was introduced into the stabilized digester A, accounting for 77.6% of the stabilized digester A, and anaerobic digestion proceeded at 37 ° C.

The wastewater from the second connection pipe 71b was introduced into the stabilized digestion tank B, which accounted for 78.4% of the stabilized digestion tank B, and anaerobic digestion proceeded at 37 ° C.

The wastewater from the third connecting pipe 71c was introduced into the stabilizing digester C, occupying 79% of the stabilizing digester C, and maintained anaerobic digestion at 37.3 ° C.

The stabilized digestion tank with anaerobic digestion produces biogas such as methane, hydrogen sulfide and the like. The generated biogas is stored in the gas storage tank 40 connected to the stabilization digester.

The biogas produced in the stabilized digestion tank A was stored in the first biogas storage tank 41 and accounted for 42.4%. The biogas generated in the stabilized digestion tank B was stored in the second biogas storage tank 42, and 71.5% , And the biogas produced in the stabilized digestion tank C was stored in the third biogas storage tank 43 and occupied 45.9%.

This shows that it is possible to increase the production of biogas through the distribution of the incoming wastewater.

<Experimental Example 2>

The gas production amount was compared using a conventional biogas system and a negative wastewater anaerobic biogas distribution system of Example 2.

FIG. 4 is a flow chart for analyzing the gas production amount after the anaerobic biogas distributing apparatus for the wastewater according to the present invention. The average daily amount of the biogas of S1 and S2 and the average daily amount of methane (CH ₄ ) and hydrogen sulfide (H ₂ S) The amount was measured.

In addition, the incoming wastewater was compared with the average (hereinafter, "2015") from June to October 2015 and the average from June to October 2016 (hereinafter referred to as "2016" The conventional wastewater was used as a conventional biogas system and the wastewater of 2016 was used as a wastewater anaerobic biogas distribution apparatus of Example 2. [

Table 1 below compares gas production.

<Table 1>

Based on FIG. 4 and Table 1, it can be seen that the average daily amount of gas in 2015 is 30.495 Nm ^3, and the average daily gas amount in 2016 is 45,621 Nm ^{3, which} is about 1.5 times higher. It can be confirmed that when the anaerobic biogas distribution apparatus of Example 2 is used, the biogas treatment performance is significantly improved compared to the conventional biogas apparatus.

<Experimental Example 3>

The monthly production of gas was compared using a conventional biogas system and a wastewater anaerobic biogas distribution system of Example 2.

In addition, a conventional biogas system was used for the wastewater of 2015, and a negative wastewater anaerobic biogas distribution system of Example 2 was used for the wastewater of 2016. The wastewater treated in the acid fermentation tank was used as a stabilization tank And they were stored for more than 6.4 days.

Table 2 below compares monthly biogas production.

<Table 2>

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Based on Table 2, it can be seen that the average daily production of biogas in 2016 was 15,127 Nm ³ , an increase of 49.9% from 2015.

It can be confirmed that the processing performance is significantly improved when the negative wastewater distribution unit is used as compared with the conventional biogas system.

<Experimental Example 4>

The economic effects of the <Example 2> before and after the improvement of the anaerobic biogas dispensing apparatus were compared.

Table 3 below compares the economic effects before and after the improvement of the biogas distribution system.

<Table 3>

Based on Table 3, the calorific value of the waste water biogas is 12,5574 Won / MJ and 5,136 Kcal / Nm ³ , and the LNG conversion is based on LHV 9,550 Kcal / Nm ³ . The gas reduction amount was calculated based on 19,300 won / CO ₂ ton.

Biogas production has increased by 15,127 Nm ³ / day after the improvement of the biogas distribution system, and the annual greenhouse gas reduction by 18.1 CO ₂ ton / day has been effective in improving the air quality.

This will save about 1.6 billion won in annual budget.

The present invention relates to an anaerobic biogas dispensing apparatus for negative wastewater, wherein the wastewater treated in the acid fermentation tank flows into the stabilization digester through the distribution pipe to increase the throughput of the wastewater, Is a commercially available invention.

Claims (8)

A plurality of acid fermentation tanks 20 for fermenting acidic wastewater;
A plurality of methane fermentation tanks (30) connected to the downstream of the acid fermentation tank (20) and fermenting acidic fermented wastewater from the acid fermentation tank (20) to methane fermentation;
A plurality of gas storage vessels (40) connected to the downstream of the methane fermentation tank (30) to stabilize the methane fermented wastewater in the methane fermentation tank (30) and store the biogas; And
And a distributor 60 disposed between the methane fermentation tank 30 and the gas storage tank 40 to distribute the biogas generated in the methane fermentation tank 30,
The distribution unit 60 includes a plurality of connection pipes connected between the methane fermentation tank 30 and the gas storage tank 40 so as to correspond to each other; A plurality of shut-off valves respectively provided on the plurality of connecting pipings and controlled to open and close each of the connecting pipes so as to adjust the gas flow rate so that the storage water levels of the respective gas storage tanks 40 are maintained to be parallel to each other; And
And is installed upstream of the shut-off valve, and is provided so as to communicate all the plurality of connection pipes. When the stirring is performed by the water column in the methane fermentation tank (30), the instantaneous pressure of the connection pipe is 2 to 3 times larger And a distribution pipe formed,
Wherein the gas storage tank (40) is provided with a stabilization digester at the bottom. delete delete delete The method according to claim 1,
Wherein the gas storage tank (40) is composed of an inner membrane and an outer membrane, and the working pressure is maintained at 0.5 to 3.5 mbar. delete delete delete

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