CN114315075A - Method for improving methane production performance of pig manure based on biogas cycle coupling activated carbon - Google Patents
Method for improving methane production performance of pig manure based on biogas cycle coupling activated carbon Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 52
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Abstract
The invention discloses a method for improving the methane production performance of pig manure based on biogas cycle coupling activated carbon. Belongs to the field of high-efficiency resource utilization of organic solid wastes. The invention solves the problems of low organic matter degradation efficiency and slow reaction in the process of treating the livestock and poultry manure by using the traditional anaerobic digestion technology, which causes high investment and operation cost. Through the biogas cycle coupling activated carbon, the full contact of hydrolase/microorganism and a substrate is promoted, the enzymatic reaction and the microorganism metabolic activity of a system are enhanced, the inter-species electron transfer is enhanced, the hydrolysis acidification efficiency and the methane production performance of an organic matter are improved, the carbon conversion rate is improved, and the efficient energy conversion of organic waste is realized. Provides technical support for the efficient and stable operation of the anaerobic digestion system, and promotes the low-carbon treatment of the livestock wastewater and the development and utilization of clean energy.
Description
Technical Field
The invention relates to the field of efficient resource utilization of organic solid wastes, in particular to a method for improving the methane production performance of pig manure based on biogas cycle coupling activated carbon.
Background
With the rapid development of the living and economic levels of people in China, the organic solid waste yield in various fields tends to increase continuously. Anaerobic digestion is a biological treatment technology for realizing the recycling of organic solid wastes, and can convert organic matters into methane so as to realize efficient recycling. Although the anaerobic digestion technology is rapidly developed due to the characteristic of environmental friendliness, the chemical components of the organic matters in the livestock and poultry manure are very complex and contain a lot of macromolecular substances which are difficult to degrade, so that the traditional anaerobic digestion technology has low hydrolytic acidification efficiency in the process of treating the livestock and poultry manure, insufficient degradation of the organic matters and poor methane production performance.
Disclosure of Invention
The invention aims to solve the problems of low organic matter degradation efficiency and high investment operation cost caused by slow reaction in the process of treating livestock manure by using the traditional anaerobic digestion technology, and provides a method for improving the methane production performance of pig manure based on biogas cycle coupling activated carbon, which promotes the full contact of hydrolase/microorganism and a substrate, enhances the enzymatic reaction and microbial metabolic activity of a system, thereby improving the organic matter degradation efficiency and the methane production performance, and realizing the reduction of fermentation time and investment operation cost.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for improving the methane production performance of pig manure based on biogas cycle coupling activated carbon comprises the following steps:
1) inoculating anaerobic sludge domesticated by pig manure into an anaerobic reactor internally provided with substrate pig manure, wherein the mass ratio of the inoculated anaerobic sludge to the substrate pig manure is 1:2-3 in terms of volatile solids, adding distilled water, uniformly mixing, adjusting the total solid content to 4.5-5.5%, and simultaneously adjusting the pH value to 7.3-7.8; then 4.5-5.5g/L of powdered activated carbon is added into the anaerobic reactor, and the mixture is uniformly mixed and stirred;
2) sealing the opening of the anaerobic reactor by using a sealing plug, wherein a first through pipe and a second through pipe are inserted into the sealing plug, and the first through pipe is connected with a condensing pipe; one end of the second through pipe is connected with the aerator, and the other end of the second through pipe is sequentially connected with the micro vacuum pump and the filter through a silica gel hose; the filter is connected with the tee joint through a silica gel hose; one end of the tee joint is connected with the condensing pipe through an elbow and a silica gel hose, and the other end of the tee joint is connected with a switch side valve of the double-valve aluminum foil composite membrane gas sampling bag through the silica gel hose;
3) placing an anaerobic reactor in a constant-temperature water bath kettle, wherein the set temperature of the constant-temperature water bath kettle is 35 +/-0.5 ℃;
4) setting the flow rate of the micro vacuum pump at 150-; the flow of the micro vacuum pump is too high, so that not only is energy consumption too high and energy is wasted, but also stirring is violent, and gas dissolved in water is blown off before being utilized by bacteria, so that the effect is poor; when the flow of the micro vacuum pump is too low, the stirring effect is poor, the uniformity of the system is not high enough, and the bacteria can not be ensured to be fully contacted with the substrate;
5) biogas generated in the anaerobic reactor enters the condensation pipe through the first through pipe, then is divided into two parts through the silica gel hose communicated with the elbow and the tee joint, one part of the biogas is pumped into the micro vacuum pump through the filter, and then is pumped into the aerator through the silica gel hose and the second through pipe to be bubbled, so that biogas circulation is formed; and the other part of the residual biogas enters a double-valve aluminum foil composite membrane gas sampling bag through a switch side valve.
Further, the powdered activated carbon is sieved by a 40-mesh sieve.
Furthermore, PP plastic particles are arranged in the condensation pipe to intercept water vapor generated by condensation in the biogas, and meanwhile, the water vapor is prevented from entering the micro vacuum pump to cause damage.
Further, the mass ratio of the anaerobic sludge to the pig manure is 2: 3; the total solids content is 5%; the pH value is 7.5; the adding amount of the powdered activated carbon is 5 g/L;
the flow rate of the micro vacuum pump is 200mL/min, the opening time is 1 hour, the closing and opening time is 1 hour, and the micro vacuum pump is repeatedly turned on/off at regular time and intermittently operated.
Furthermore, the bottom of the side surface of the anaerobic reactor is provided with a sampling port.
Further, the sealing plug is a rubber plug; the first through pipe and the second through pipe are both 304 stainless steel pipes.
Furthermore, the constant temperature water bath is an electric heating digital display constant temperature water bath.
Further, the aerator is a titanium alloy aerator.
Furthermore, the elbow is an L-shaped elbow, and the tee is a Y-shaped tee.
The device for improving the methane production performance of pig manure by using the method for improving the methane production performance of pig manure based on the biogas cycle coupling activated carbon comprises an aerator, a constant-temperature water bath, an anaerobic reactor, a condenser pipe, a micro vacuum pump, a filter, a double-valve aluminum foil composite membrane gas sampling bag (13) and a sealing plug (14);
the anaerobic reactor is arranged in the constant-temperature water bath kettle;
the sealing plug is used for sealing the bottle mouth of the anaerobic reactor;
a first through pipe and a second through pipe are inserted into the sealing plug, the first through pipe is connected with a condensation pipe, and PP plastic particles are arranged in the condensation pipe;
one end of the second through pipe is connected with the aerator, the other end is sequentially connected with the micro vacuum pump and the filter through the silica gel hose,
establish switch side valve on bivalve aluminium foil complex film gas sampling bag (13), the filter passes through the silica gel hose connection tee bend, tee bend one end is passed through return bend, silica gel hose and is connected with the condenser pipe, and the other end passes through the silica gel hose and is connected with the switch side valve of bivalve aluminium foil complex film gas sampling bag (13).
The invention has the beneficial technical effects that:
(1) according to the invention, the activated carbon is coupled through biogas circulation, so that the full contact between the hydrolase/microorganism and the substrate is promoted, the enzymatic reaction and the microbial metabolic activity of a system are enhanced, the inter-species electron transfer is enhanced, the hydrolysis acidification efficiency and the methane production performance of an organic matter are improved, the carbon conversion rate is improved, and the efficient energy conversion of the organic waste is realized. Provides technical support for the efficient and stable operation of the anaerobic digestion system, and promotes the low-carbon treatment of the livestock wastewater and the development and utilization of clean energy.
(2) A large amount of energy is consumed in a traditional mechanical stirring and mixing mode, the biogas circulation is used as a diffusion device, the reactor is stirred and mixed through biogas bubbling, so that microorganisms are fully contacted with a substrate, and the organic matter degradation efficiency and the methane production performance are effectively improved.
(3) Conductive carbon materials have always been used directly as electron carriers as additives to improve anaerobic digestion efficiency by facilitating inter-species electron transfer. Can accelerate and stabilize organic substances to CH4The transformation of (3). The powdered activated carbon has larger specific surface area and good adsorption performance, can provide attachment points for microorganisms, and is beneficial to reducing the influence of organic impact load on the methane production process so as to reduce the lag time of methane production and improve the methane yield.
(4) The invention solves the problems of low organic matter degradation efficiency and slow reaction in the process of treating the livestock and poultry manure by using the traditional anaerobic digestion technology, which causes high investment and operation cost.
Drawings
FIG. 1 is a schematic diagram of the structure of an apparatus used in the method of the present invention;
FIG. 2 is a graph showing the change of the concentration of chemical oxygen demand sCOD with time in example 1 of the present invention;
FIG. 3 is a graph of cumulative methane production over time for example 1 of the present invention;
in the figure: 1. a sampling port; 2. an aerator; 3. a constant-temperature water bath kettle; 4. an anaerobic reactor; 501 a first through pipe and 502 a second through pipe; 6. a condenser tube; 7. PP plastic particles; 8. bending the pipe; 9. a tee joint; 10. switching a side valve; 11. a micro vacuum pump; 12. a filter; 13. a double-valve aluminum foil composite membrane gas sampling bag; 14. and (4) sealing the plug.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite, the present invention will be described in further detail with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.
The anaerobic sludge used in the embodiment of the invention is domesticated by pig manure, and the domestication method comprises the following steps:
inoculating sludge into an anaerobic reactor with a built-in substrate pig manure, wherein the mass ratio of the inoculated anaerobic sludge to the substrate pig manure is 2:3 according to VS (volatile solid), adding distilled water, uniformly mixing, adjusting the TS (total solid) content to 5%, adjusting the pH value to 7.5, and performing anaerobic fermentation at the temperature of 35 +/-0.5 ℃ for 45 days to obtain the anaerobic sludge.
Example 1
As shown in figure 1, the method for improving the methane production performance of pig manure based on biogas cycle coupling activated carbon comprises the following steps:
1) inoculating anaerobic sludge domesticated by pig manure into an anaerobic reactor (4) internally provided with substrate pig manure, wherein in the embodiment, the volume of the anaerobic reactor (4) is 2L, the mass ratio of the inoculated anaerobic sludge to the substrate pig manure is 2:3 according to VS (volatile solid), adding distilled water, mixing uniformly, adjusting the TS (total solid) content to be 5%, and simultaneously adjusting the pH value to be 7.5; then 5.0g/L of powdered activated carbon is added into the anaerobic reactor, and the powdered activated carbon is sieved by a 40-mesh sieve; mixing and stirring uniformly;
2) strictly sealing the opening of the anaerobic reactor (4) by adopting a sealing plug (14) to ensure anaerobic conditions, inserting a first through pipe (501) and a second through pipe (502) into the sealing plug (14), connecting the first through pipe (501) with a condenser pipe (6), and arranging PP plastic particles (7) in the condenser pipe (6) to intercept water vapor generated by condensation in biogas and simultaneously avoid entering a micro vacuum pump (11) to cause damage; one end of the second pipe (502) is connected with the aerator (2), and the other end is sequentially connected with the micro vacuum pump (11) and the filter (12) through a silica gel hose (not marked in the figure); the filter (12) is connected with the tee joint (9) through a silica gel hose; one end of the tee joint (9) is connected with the condenser pipe (6) through the elbow (8) and the silica gel hose, and the other end of the tee joint is connected with a switch side valve (10) of a double-valve aluminum foil composite membrane gas sampling bag (13) through the silica gel hose;
3) placing the anaerobic reactor (4) in a constant-temperature water bath (3), wherein the set temperature of the constant-temperature water bath (3) is 35 +/-0.5 ℃;
4) setting the flow rate of the micro vacuum pump to be 200mL/min, and repeating on/off intermittent operation at regular time according to the conditions of opening for 1 hour and closing for 1 hour;
5) under the anaerobic condition, biogas generated in the anaerobic reactor (4) enters the condensation pipe (6) through the first through pipe (501), then is divided into two parts through the silica gel hose communicated with the elbow (8) and the tee joint (9), one part of biogas is pumped into the micro vacuum pump (11) through the filter (12), and then is pumped into the aerator (2) for bubbling through the silica gel hose and the second through pipe (502), so that biogas circulation is formed; the other part of the residual marsh gas enters a double-valve aluminum foil composite membrane gas sampling bag (13) through a switch side valve (10).
In the embodiment, the bottom of the side surface of the anaerobic reactor (4) is provided with a sampling port (1) for facilitating sampling detection.
In the embodiment, the sealing plug (14) is a rubber plug; the first through pipe (501) and the second through pipe (502) are both 304 stainless steel pipes; the constant temperature water bath (3) is an electric heating digital display constant temperature water bath; the aerator is a titanium alloy aerator; the elbow (8) is an L-shaped elbow (8), and the tee joint (9) is a Y-shaped tee joint (9).
Example 2
The difference from the embodiment 1 is that,
1) inoculating anaerobic sludge domesticated by pig manure into an anaerobic reactor (4) internally provided with substrate pig manure, wherein the mass ratio of the inoculated anaerobic sludge to the substrate pig manure is 2:2.8 according to volatile solids, adding distilled water, uniformly mixing, adjusting the total solid content to 5.0%, and simultaneously adjusting the pH value to 7.5; then 4.5g/L of powdered activated carbon is added into the anaerobic reactor, and the powdered activated carbon is sieved by a 40-mesh sieve; mixing and stirring uniformly;
4) in the step, the flow rate of the micro vacuum pump is set to be 150mL/min, and the micro vacuum pump is started for 1 hour and stopped for 1 hour, and is repeatedly started/stopped for intermittent operation at regular time;
the other steps were in accordance with example 1.
Example 3
The difference from the embodiment 1 is that,
1) inoculating anaerobic sludge domesticated by pig manure into an anaerobic reactor (4) internally provided with substrate pig manure, wherein the mass ratio of the inoculated anaerobic sludge to the substrate pig manure is 2:3.2 according to volatile solids, adding distilled water, mixing, adjusting the total solid content to 5.0%, and adjusting the pH value to 7.5; then 5.5g/L of powdered activated carbon is added into the anaerobic reactor, and the powdered activated carbon is sieved by a 40-mesh sieve; mixing and stirring uniformly;
4) in the step, the flow rate of the micro vacuum pump is set to be 250mL/min, and the micro vacuum pump is started for 1 hour and stopped for 1 hour, and is repeatedly started/stopped for intermittent operation at regular time;
the other steps were in accordance with example 1.
As shown in figure 1, the device used in the above embodiment comprises an aerator (2), a constant temperature water bath (3), an anaerobic reactor (4), a condenser pipe (6), a micro vacuum pump (11), a filter (12), a double-valve aluminum foil composite membrane gas sampling bag (13) and a sealing plug (14);
the anaerobic reactor (4) is arranged in the constant temperature water bath kettle (3);
the sealing plug (14) is used for sealing the opening of the anaerobic reactor (4);
a first through pipe (501) and a second through pipe (502) are inserted into the sealing plug (14), the first through pipe (501) is connected with the condensation pipe (6), and PP plastic particles (7) are arranged in the condensation pipe (6);
one end of the second pipe (502) is connected with the aerator (2), and the other end is sequentially connected with the micro vacuum pump (11) and the filter (12) through a silica gel hose;
establish switch side valve (10) on bivalve aluminium foil complex film gas sampling bag (13), filter (12) are through silica gel hose connection tee bend (9), and tee bend (9) one end is passed through the return bend, the silica gel hose is connected with condenser pipe (6), and the other end passes through the silica gel hose and is connected with switch side valve (10) of bivalve aluminium foil complex film gas sampling bag (13).
Comparative example 1
The difference from example 1 is that 2.5g/L powdered activated carbon was fed to the anaerobic reactor. The method specifically comprises the following steps:
1) in the steps, 1) inoculating anaerobic sludge domesticated by pig manure into an anaerobic reactor (4) internally provided with substrate pig manure, wherein the mass ratio of the inoculated anaerobic sludge to the substrate pig manure is 2:3 according to volatile solids, adding distilled water, mixing, adjusting the total solid content to 5%, and simultaneously adjusting the pH value to 7.5; then 2.5g/L of powdered activated carbon is added into the anaerobic reactor, and the powdered activated carbon is sieved by a 40-mesh sieve; mixing and stirring uniformly. The other steps were in accordance with example 1.
Comparative example 2
The difference from example 1 is that 4) the micro vacuum pump flow rate was set to 300mL/min, and the ON/OFF intermittent operation was repeated at regular intervals for 1 hour of ON and 1 hour of OFF. The other steps were in accordance with example 1.
Comparative example 3
The difference from example 1 is that 4) the flow rate of the micro vacuum pump was set to 100mL/min, and the intermittent operation was repeated on/off at regular time intervals for 1 hour on and 1 hour off. The other steps were in accordance with example 1.
The difference from example 1 is that no activated carbon powder was added and no biogas recycle device was used. The other steps were in accordance with example 1.
The difference from example 1 is that only a biogas circulating apparatus was used without adding activated carbon powder. The other steps were in accordance with example 1.
The difference from example 1 is that only 5.0g/L of activated carbon powder was added, and no biogas recycling device was used. The other steps were in accordance with example 1.
In order to verify the treatment effect of the invention, the substrate and the inoculum are respectively mixed according to the mixing proportion of the embodiment and the comparative example, powdered activated carbon is added, the pH value is adjusted, the mixture is uniformly stirred, the mixture enters an anaerobic reactor for anaerobic fermentation to produce methane, and indexes such as sCOD (chemical oxygen demand), methane yield and the like are measured from a sampling port and a gas sampling bag, and the indexes are used for evaluating the organic matter degradation efficiency and the methane production performance of an anaerobic reaction system and are compared with a control group of the traditional anaerobic digestion. The results are as follows
The test result shows that:
the above results show that examples 1 to 3 of the present invention are significantly improved in both organic matter degradation efficiency and methanogenic performance, as compared with the control group.
Among them, comparative example 1 used a smaller amount of powdered activated carbon and the methane production was significantly decreased, compared to example 1.
The micro vacuum pump of comparative example 2 has too high flow rate, not only energy consumption is too high and energy is wasted, but also stirring is violent, and gas dissolved in water is blown off before being utilized by bacteria, thus causing poor effect.
The micro vacuum pump of comparative example 3 has too low flow, poor stirring effect, and insufficient system uniformity, and cannot ensure that the bacteria are fully contacted with the substrate.
Moreover, as can be seen from fig. 2 and 3, based on the example 1 (experimental group) of the present invention, compared with the control group of the conventional anaerobic digestion, the organic matter degradation efficiency and the methanogenic performance are significantly improved, and the practical application can greatly shorten the fermentation time and reduce the investment and operation cost.
Claims (10)
1. A method for improving the methane production performance of pig manure based on biogas cycle coupling activated carbon is characterized by comprising the following steps: the method comprises the following steps:
1) inoculating anaerobic sludge domesticated by pig manure into an anaerobic reactor (4) internally provided with substrate pig manure, wherein the mass ratio of the inoculated anaerobic sludge to the substrate pig manure is 1:2-3 according to volatile solids, adding distilled water, mixing, adjusting the total solid content to 4.5-5.5%, and simultaneously adjusting the pH value to 7.3-7.8; then 4.5-5.5g/L of powdered activated carbon is added into the anaerobic reactor, and the mixture is mixed and stirred;
2) sealing the opening of the anaerobic reactor (4) by using a sealing plug (14), wherein a first through pipe (501) and a second through pipe (502) are inserted into the sealing plug (14), and the first through pipe (501) is connected with a condensing pipe (6); one end of the second pipe (502) is connected with the aerator (2), and the other end is sequentially connected with the micro vacuum pump (11) and the filter (12) through hoses; the filter (12) is connected with the tee joint (9) through a hose; one end of the tee joint (9) is connected with the condenser pipe (6) through an elbow (8) and a hose, and the other end of the tee joint is connected with a switch side valve (10) of a double-valve aluminum foil composite membrane gas sampling bag (13) through a silica gel hose;
3) placing the anaerobic reactor (4) in a constant-temperature water bath (3), wherein the set temperature of the constant-temperature water bath (3) is 35 +/-0.5 ℃;
4) setting the flow rate of the micro vacuum pump at 150-;
5) biogas generated in the anaerobic reactor (4) enters the condensation pipe (6) through the first through pipe (501), then is divided into two parts through the hose communicated with the elbow (8) and the tee joint (9), one part of biogas is pumped into the micro vacuum pump (11) through the filter (12), and then is pumped into the aerator (2) through the hose and the second through pipe (502) to be bubbled, so that biogas circulation is formed; the other part of the residual marsh gas enters a double-valve aluminum foil composite membrane gas sampling bag (13) through a switch side valve (10).
2. The method of claim 1, wherein: and sieving the powdered activated carbon by a 40-mesh sieve.
3. The method of claim 1, wherein: PP plastic particles (7) are arranged in the condensation pipe (6).
4. The method according to claim 1 or 2, characterized in that:
the mass ratio of the anaerobic sludge to the pig manure is 2: 3; the total solids content is 5%; the pH value is 7.5; the adding amount of the powdered activated carbon is 5 g/L;
the flow rate of the micro vacuum pump is 200 mL/min; cycle of the timed repetitive on/off intermittent operation: the on-time was 1 hour and the off-time was 1 hour.
5. The method of claim 1, wherein: the bottom of the side surface of the anaerobic reactor (4) is provided with a sampling port (1).
6. The method of claim 1, wherein: the sealing plug (14) is a rubber plug; the hose is a silica gel hose; the first through pipe (501) and the second through pipe (502) are both 304 stainless steel pipes.
7. The method of claim 1, wherein: the constant temperature water bath (3) is an electric heating digital display constant temperature water bath.
8. The method of claim 1, wherein: the aerator is a titanium alloy aerator.
9. The method of claim 1, wherein: the elbow (8) is an L-shaped elbow, and the tee joint (9) is a Y-shaped tee joint.
10. The method according to any one of claims 1-9, wherein: the device used in the method comprises an aerator (2), a constant temperature water bath (3), an anaerobic reactor (4), a condenser pipe (6), a micro vacuum pump (11), a filter (12), a double-valve aluminum foil composite membrane gas sampling bag (13) and a sealing plug (14);
the anaerobic reactor (4) is arranged in the constant-temperature water bath kettle (3);
the sealing plug (14) is used for sealing the opening of the anaerobic reactor (4);
a first through pipe (501) and a second through pipe (502) are inserted into the sealing plug (14), the first through pipe (501) is connected with the condensation pipe (6), and PP plastic particles (7) are arranged in the condensation pipe (6);
one end of the second pipe (502) is connected with the aerator (2), the other end is sequentially connected with the micro vacuum pump (11) and the filter (12) through a silica gel hose,
establish switch side valve (10) on bivalve aluminium foil complex film gas sampling bag (13), filter (12) are through silica gel hose connection tee bend (9), tee bend (9) one end is passed through return bend, silica gel hose and is connected with condenser pipe (6), and the other end passes through the silica gel hose and is connected with switch side valve (10) of bivalve aluminium foil complex film gas sampling bag (13).
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