CN111876444A - Enhanced gas production method for co-fermentation of kitchen waste and hybrid pennisetum and application thereof - Google Patents
Enhanced gas production method for co-fermentation of kitchen waste and hybrid pennisetum and application thereof Download PDFInfo
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Abstract
The invention provides a method for strengthening gas production by co-fermentation of kitchen waste and hybrid pennisetum and application thereof. According to the invention, the iron additives with specific dosage, valence state and particle size are added in the co-fermentation process of the kitchen waste and the hybrid pennisetum alopecuroides, so that the fermentation environment is improved, the stability and the biogas content in the whole fermentation process are improved, the used iron additives are low in price, the effective utilization of raw materials can be realized on the premise of controlling the cost, the waste liquid and the biogas residues in the fermentation waste can be used for producing fertilizers, and the waste grease can be used for producing biodiesel, so that the method is economic and environment-friendly.
Description
Technical Field
The invention relates to the technical field of methane preparation by organic wastes. More particularly, relates to a method for strengthening gas production by co-fermentation of kitchen waste and hybrid pennisetum and application thereof.
Background
With the increase of population, the number of kitchen waste is gradually increased year by year, and the problems of economy and environment in China caused by a large amount of kitchen waste are particularly prominent. The kitchen waste is used as a resource for misplacing, has huge utilization value, is subjected to anaerobic fermentation to obtain methane, methane liquid and methane slag, is comprehensively utilized, is an optimal mode for realizing reclamation, harmlessness and reduction of the kitchen waste, has the characteristics similar to natural gas, and can be used as a fuel of an internal combustion engine and chemical raw materials for producing methanol, formalin, carbon tetrachloride and the like besides being directly combusted for cooking, drying agricultural and sideline products, heating, lighting, gas welding and the like. The feed liquid and the sediments discharged after the fermentation of the biogas device contain rich nutrient substances and can be used as fertilizer and feed. Patent CN201210037257.5 provides a method for producing biogas by anaerobic fermentation of kitchen waste with universality, and the kitchen waste from different sources is anaerobically fermented into biogas by adopting two-stage anaerobic reaction, but the method has higher process requirements and more complex process. Therefore, the fermentation efficiency can be improved by adding other substances to carry out co-fermentation with the kitchen waste.
Energy grass, a general name of lignocellulose plants which can be used as fuel, has the characteristics of high biomass, high photosynthetic rate, strong environment adaptability, good stress resistance and the like, has large planting area, and is a renewable biomass energy source with great development prospect. At present, there is a method for producing biogas by co-fermenting energy grass and kitchen waste, and patent CN201710042146.6 provides a comprehensive utilization method of energy grass and high-protein kitchen waste, and the high-protein kitchen waste and the energy grass are used as raw materials to jointly produce biogas and biochar, but the method has a high requirement on the component content of the kitchen waste, and when the method is applied to fermentation of common kitchen waste, the fermentation efficiency is reduced.
Therefore, the method has strong universality and can improve the stability (pH value and NH) of the fermentation process of the kitchen waste substances3N value, VFAs concentration, alkalinity) and biogas Content (CH)4Content, CH4/CO2) The method of (2) is of great importance.
Disclosure of Invention
The invention aims to provide a method for promoting the co-fermentation performance of kitchen waste and hybrid pennisetum, and researches for the first time find that the iron additive can promote the co-fermentation gas production performance of the hybrid pennisetum and the kitchen waste.
The invention aims to provide a method for promoting co-fermentation of kitchen waste and hybrid pennisetum alopecuroides.
The invention also aims to provide application of the method in preparation of biogas by fermenting kitchen waste.
In order to achieve the purpose, the invention is realized by the following scheme:
the invention provides a method for promoting co-fermentation of kitchen waste and hybrid pennisetum alopecuroides, which comprises the following steps:
s1, removing redundant moisture and surface grease of the kitchen waste, crushing the kitchen waste into slurry, and uniformly stirring the slurry;
s2, removing roots of the hybrid pennisetum alopecuroides and crushing;
and S3, transferring the kitchen waste and the hybrid pennisetum alopecuroides to an anaerobic fermentation tank, adding an iron additive into the fermentation tank, inoculating sludge, and performing anaerobic fermentation.
Through a great deal of research and exploration, the inventor adds iron additives with different dosages, different valence states and different particle sizes (non-nano-scale and nano-scale) in the co-fermentation process of the kitchen waste and the hybrid pennisetum alopecuroides, and compares the pH value and the NH3N value, COD value, VFAs concentration, basicity, CH4Content, daily gas production, cumulative gas production, CH4Yield, T80The indexes such as VS removal rate and COD removal rate and the like to obtain specific types of additives and dosage, and the gas production performance of the co-fermentation of the kitchen waste and the hybrid pennisetum can be effectively improved.
Preferably, the iron-based additive includes reduced Iron Powder (IP), ferrous oxide (FeO), nano zero-valent iron (nZVI), ferric oxide (Fe)2O3) Nano iron oxide (nFe)2O3) Ferroferric oxide (Fe)3O4) Nanometer ferroferric oxide (nFe)3O4) One or more of them.
Most preferably, the ferrous additive is IP.
The method has the advantages that the specific iron additives are added in the co-fermentation process of the kitchen waste and the hybrid pennisetum, so that the purposes of improving the fermentation environment and promoting the yield of the biogas are achieved, the used iron additives are low in price, the effective utilization of the raw materials can be realized on the premise of controlling the cost, the waste liquid and the biogas residues in the fermentation waste can be used for producing the fertilizer, the waste oil can be used for producing the biodiesel, and the method is economical and environment-friendly.
Preferably, the ratio of the volatile solid contents (VS) of the kitchen waste to the hybrid pennisetum is as follows: 0.5-9.5: 0.5-9.5.
Preferably, the iron additive accounts for 0.1-1.5% of the total fresh weight of the kitchen waste and the hybrid pennisetum alopecuroides.
As a preferred possible embodiment, the iron-based additive accounts for 0.5% of the total fresh weight of the kitchen waste and the hybrid pennisetum.
As a preferable mode, the sludge is obtained by culturing biogas residues at 37 ℃ and filtering the biogas residues through a mesh screen.
Preferably, the inoculation amount of the sludge accounts for 37-46% of the volatile solid content (VS) of the kitchen waste and the hybrid pennisetum.
As a preferred possible embodiment, the amount of sludge inoculated is 45% of the volatile solids content (VS) of the kitchen waste and the hybrid pennisetum.
Preferably, the stirring speed in the anaerobic fermentation process is 110-130r/min, and the stirring frequency is 2-3min every 8-10 min.
As a preferable mode, the stirring speed in the anaerobic fermentation process is 120r/min, and the stirring frequency is 3min every 10 min.
Preferably, the fermentation temperature in the anaerobic fermentation process is 35-38 ℃.
Preferably, the organic load of the fermentation liquor in the anaerobic fermentation process is 6-15g VS/L.
As a preferred embodiment, the organic load of the fermentation broth during the anaerobic fermentation is 15g VS/L.
Preferably, before the anaerobic fermentation tank is sealed, high-purity nitrogen is introduced into the fermentation tank to remove air, so that the anaerobic environment of the fermentation tank is maintained.
As a preferable implementation mode, the hybrid pennisetum alopecuroides is a triploid hybrid perennial herbaceous C4 plant prepared by taking the sterile line of the pennisetum alopecuroides Tifi23A as a female parent and taking the pennisetum purpureum N51 as a male parent, and has high dry matter yield, high leaf-stem ratio, strong regeneration capacity and multiple cradling in growing seasons.
The invention also requests to protect the application of the method in preparing the methane by fermenting the kitchen waste.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the iron additives with specific dosage, valence and particle size are added in the co-fermentation process of the kitchen waste and the hybrid pennisetum, so that the fermentation environment is improved, the stability and the biogas content in the whole fermentation process are improved, the resources are effectively utilized, the environment is protected, and the cost is reduced.
Drawings
FIG. 1 shows the effect of IP, nZVI, FeO on the daily gas production rate of mixed fermentation of kitchen waste and hybrid pennisetum.
FIG. 2 shows the effect of IP, nZVI, FeO on the cumulative gas production rate during the mixed fermentation of kitchen waste and hybrid pennisetum.
FIG. 3 shows CH in the process of mixed fermentation of kitchen waste and hybrid pennisetum alopecuroides by IP, nZVI and FeO4The effect of yield.
FIG. 4 shows CH in the process of mixed fermentation of kitchen waste and hybrid pennisetum alopecuroides by IP, nZVI and FeO4Influence of the content.
FIG. 5 shows CH in the process of mixed fermentation of kitchen waste and hybrid pennisetum alopecuroides by IP, nZVI and FeO4/CO2The influence of (c).
FIG. 6 shows the effect of IP, nZVI, FeO on VS and COD removal rate during mixed fermentation of kitchen waste and hybrid pennisetum.
FIG. 7 is Fe2O3、nFe2O3，Fe3O4、nFe3O4Influence on the daily gas yield in the process of mixing anaerobic fermentation of the kitchen waste and the hybrid pennisetum alopecuroides.
FIG. 8 is Fe2O3、nFe2O3，Fe3O4、nFe3O4Influence on the accumulated gas production rate in the mixed anaerobic fermentation process of the kitchen waste and the hybrid pennisetum alopecuroides.
FIG. 9 is Fe2O3、nFe2O3，Fe3O4、nFe3O4CH in the process of mixing anaerobic fermentation of kitchen waste and hybrid pennisetum alopecuroides4The effect of yield.
FIG. 10 is Fe2O3、nFe2O3，Fe3O4、nFe3O4CH in the process of mixing anaerobic fermentation of kitchen waste and hybrid pennisetum alopecuroides4Influence of the content.
FIG. 11 is Fe2O3、nFe2O3，Fe3O4、nFe3O4CH in the process of mixing anaerobic fermentation of kitchen waste and hybrid pennisetum alopecuroides4/CO2The influence of (c).
FIG. 12 is Fe2O3、nFe2O3，Fe3O4、nFe3O4Influence on VS removal rate in the mixed anaerobic fermentation process of kitchen waste and hybrid pennisetum alopecuroides.
FIG. 13 shows the effect of COD removal in the anaerobic fermentation process of kitchen waste and hybrid pennisetum.
Detailed Description
The invention is further described with reference to the drawings and the following detailed description, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
1. Experimental materials
The kitchen waste is taken from a canteen of Guangzhou energy research institute of Chinese academy of sciences. After the kitchen waste is collected, redundant water and surface grease are removed in an extrusion mode, and then bones, napkin paper, garbage bags and other sundries in the kitchen waste are picked up. Then pulverizing into slurry with high speed pulverizer, stirring, packaging into sealed bag, and storing in refrigerator at-20 deg.C for a long time.
The hybrid pennisetum setaceum was obtained from the experimental base of Zengchenning west (23 ° 24'N, 113 ° 64' E) in Guangzhou, Guangdong province. Collecting grass, removing root, cutting to 2-3cm, pulverizing for 1min with high speed pulverizer, packaging in sealed bag, and storing in refrigerator at-20 deg.C for a long time.
The inoculated sludge is obtained from Guangzhou energy research institute of Chinese academy of sciences, is obtained by culturing biogas residues at 37 ℃, and is used after being filtered by a mesh screen. The inoculum size was 45% of the volatile solids content (VS) of the feedstock.
Additives were purchased from karst mall, as shown in table 1; the characteristics of the kitchen waste and the hybrid pennisetum used in the experiment are shown in table 2.
TABLE 1 characteristics of the iron species additives
TABLE 2 Properties of the raw materials used in the experiment
2. Determination of each index of experiment
TS and VS are respectively dried by a 105 ℃ oven and calcined by a 550 ℃ muffle furnace for measurement; the contents of C and N elements were measured by VarioEL element analyzer (Elementar, Germany); the pH value is measured by a thunder magnetic pHS-3C type pH meter; alkalinity is measured by an automatic titrator; COD value and NH3the-N value is determined by a hash reagent after the sample liquid is centrifuged for 3min at 5000 rpm. CH in biogas4And CO2Measuring the gas content by adopting Shimadzu GC2014 type high performance gas chromatography, a TCD detector and a Porapak Q chromatographic column, wherein the carrier gas is Ar, the temperatures of a sample inlet, a column box and the detector are respectively 50 ℃, 100 ℃ and 120 ℃, and the sample measuring time is 7 min; VFAs were determined by high performance liquid chromatography.
Example 1 Effect of IP, nZVI, FeO on Mixed fermentation Performance of kitchen garbage and hybrid pennisetum
1. Experimental methods
(1) Experimental groups: the fermentation raw materials are kitchen waste and hybrid pennisetum, the organic load of the fermentation liquor is 15g VS/L, IP, nZVI and FeO are added according to the addition amount of 0.5%, 1.0% and 1.5% of the total fresh weight of the kitchen waste and the hybrid pennisetum, 300mL of inoculated sludge and 100mL of deionized water are added into a fermentation tank, high-purity nitrogen is introduced into the fermentation tank before the device is sealed to remove air, and the stirring frequency is 3min per 10 min. The experiment was stopped when the daily gas production was less than 1% of the total gas production. Three parallel experiments were set up for each group.
(2) The experimental control group differs from the experimental group in that no iron additive is added.
(3) The blank control group was only inoculated sludge added.
2. Results of the experiment
FIG. 1 shows the results of the effects of IP, nZVI, FeO on the daily gas production rate during the mixed fermentation of kitchen waste and pennisetum hydridum, and it can be seen from the effects of different additive amounts on the daily gas production rate that the three additive amounts are 0.5%, and the effects of the additive amounts are 0.5% IP > 1.5% IP > 1.0% IP, 0.5% FeO > 1.5% FeO > 1.0% FeO, and 0.5% nZVI > 1.5% nZVI > 1.0% nZVI, respectively.
FIG. 2 shows the effect of IP, nZVI, FeO on the cumulative gas production rate during the mixed fermentation of kitchen waste and hybrid pennisetum, with 0.5% of the addition being the best for each additive. The effect of different doses of different additives on cumulative gas production was 0.5% IP (39.47%) > 0.5% FeO (26.89%) > 1.5% FeO (14.99%) > 1.0% FeO (4.42%) > 0.5% nZVI (0.62%) > 1.5% IP (-0.86%) > 1.5% nZVI (-2.13%) > 1.0% IP (-5.66%) > 1.0% nZVI (-6.04%), respectively. Overall, the additive FeO has the best effect and does not generate inhibition phenomenon; the differences between the different doses of IP were the greatest and between the different doses of nZVI the least.
FIG. 3 shows CH in the process of mixed fermentation of kitchen waste and hybrid pennisetum alopecuroides by IP, nZVI and FeO4Effect of yield results, CH, in comparison with control without additive4The most significant overall yield of (c) is 0.5% IP. By the end of fermentation, each experimental group CH4The yield of (a) is 757.58mL, 1220.29mL, 732.35mL, 730.25mL, 982.76mL, 737.98mL, 936.90mL, 818.86mL, 732.78mL and 829.26mL respectively, and the yield is respectively improved by 61.58%, -3.45%, -3.61%, 29.72%, -2.5%9%, 23.67%, 8.09%, -2.61% and 9.46%. According to the daily gas production rate change curve, CH can be seen4The daily gas production of 0.5% IP with higher yield, 0.5% FeO, 1.5% nZVI and 0.5% nZVI in 2d is larger, and at this time, the hydrogen production stage is mainly adopted, and H is2Can be reacted with CO2The reaction produces methane.
FIG. 4 shows CH in the process of mixed fermentation of kitchen waste and hybrid pennisetum alopecuroides by IP, nZVI and FeO4Effect of the content results, different dosages of each of the three additives on CH4The effects of the amounts are substantially similar, with FeO and nZVI both being added at 1.5% addition levels with the exception of 0.5% addition level for best IP effect. CH (CH)4The content of more than 60% of the total amount of the active components is only 0.5% of IP, 1.0% of IP, 0.5% of nZVI, 1.0% of nZVI and 1.5% of nZVI, and the days are 5d, 4d, 3d and 4d respectively.
FIG. 5 shows CH in the process of mixed fermentation of kitchen waste and hybrid pennisetum alopecuroides by IP, nZVI and FeO4/CO2Influence of (3) results, CH, in comparison with the control without additive4/CO2Values except for 1.5% IP and 1.0% FeO were increased by 10.10% and 14.63%, respectively.
FIG. 6 shows the influence of IP, nZVI, FeO on VS and COD removal rate in the mixed fermentation process of kitchen waste and hybrid pennisetum, VS removal rate of each experimental group is between 33.16% -38.22% except that 0.5% nZVI is 25.92%, the best effect is 38.22% of 1.0% FeO, which is 0.03% higher than that of the control experimental group without additive; the addition of different doses of each additive resulted in an improvement in COD removal compared to the control experiment without additive (65.54%), with the COD removal effect of each experiment being in the order of 1.5% nZVI (86.52) > 0.5% IP (79.82%) > 1.0% nZVI (78.17%) > 1.5% IP (77.41%) > 0.5% nZVI (77.18%) > 1.0% FeO (76.55%) > 1.5% IP (74.64%) > 0.5% FeO (74.63%) > 1.0% FeO (72.84%), increased by 0.32-fold, 0.22-fold, 0.19-fold, 0.18-fold, 0.17-fold, 0.14-fold and 0.11-fold, respectively. Overall, the additive nZVI works best.
The experimental results can be summarized as follows: for three different additives IP, nZVI, FeO, the total adding amount effects are 0.5%, 1.5% and 1.0% in sequence; the largest impact on gas production and gas composition is 0.5% IP, which accumulates gas production and CH4The yield is 2495.40mL and 1220.29mL respectively, and is increased by 39.6 percent and 61.1 percent respectively relative to a blank control group; to CH4/CO2The most influential was 1.0% FeO, an improvement of 14.6% over the blank.
Example 2 Fe2O3、nFe2O3、Fe3O4、nFe3O4Influence on mixed fermentation performance of kitchen waste and hybrid pennisetum alopecuroides
1. Experimental method the same as that of example 2, except that Fe is used as the iron-based additive2O3、nFe2O3、Fe3O4、nFe3O4。
2. Results of the experiment
FIG. 7 is Fe2O3、nFe2O3，Fe3O4、nFe3O4nFe shows the influence of the four additives added with three different dosages on the daily gas yield of the fermentation system on the daily gas yield of the mixed anaerobic fermentation process of the kitchen waste and the hybrid pennisetum alopecuroides2O3、nFe3The consistency of the daily gas production rate of the three addition amounts of O is obviously better than that of Fe2O3And Fe3O4However, the high and low daily gas production rates are contrary to each other, because the nano-sized particles are easy to aggregate, so that the difference between the doses participating in the reaction is smaller, while for the larger particles, the excessive amount of the particles can adversely affect the gas production, and it is considered that the excessive amount of the particles can inhibit the activity of some microorganisms. The daily gas production rate will show three small peaks at 1d, 5d and 8d, which may be related to the number of fermentative bacteria, hydrogen-producing acetogenic bacteria, hydrogen-consuming acetogenic bacteria, methanogenic bacteria and methanogenic bacteria. In addition, nFe2O3、nFe3O is Fe2O3And Fe3O4The gas production time is longer.
FIG. 8 is Fe2O3、nFe2O3，Fe3O4、nFe3O4nFe influence on the accumulated gas production rate in the anaerobic fermentation process of mixing the kitchen waste and the hybrid pennisetum2O3And nFe3O4The difference of the cumulative gas production rate among the three addition amounts is the smallest, wherein the 0.5 percent experimental group has better effect on Fe2O3And Fe3O4The difference of the accumulated gas production rate between different dosages is increased, and the effect of 0.5 percent is obviously better than that of 1.0 percent and 1.5 percent.
FIG. 9 is Fe2O3、nFe2O3，Fe3O4、nFe3O4CH in the process of mixing anaerobic fermentation of kitchen waste and hybrid pennisetum alopecuroides4Effect of yield, different addition on CH4The effect of the production is seen to be somewhat regular, nFe2O and Fe3O4The experimental groups were: 0.5 percent>1.5％>1.0％，nFe2O3And nFe3O4The experimental group is 1.0%>1.5％>0.5％。
FIG. 10 is Fe2O3、nFe2O3，Fe3O4、nFe3O4CH in the process of mixing anaerobic fermentation of kitchen waste and hybrid pennisetum alopecuroides4Influence of content, improving effect of addition amount Fe2O3And Fe3O4Is 0.5 percent>1.5％>1.0％，nFe2O3And nFe3O4Is 1.0 percent>1.5％>0.5 percent. Additionally, 0.5% Fe2O3CH (A) of4The change curve of the content is a more ideal state for producing the methane by anaerobic fermentation because of high CH4The proportional methane can generate higher energy and has higher utilization value.
FIG. 11 is Fe2O3、nFe2O3，Fe3O4、nFe3O4CH in the process of mixing anaerobic fermentation of kitchen waste and hybrid pennisetum alopecuroides4/CO2Influence of (C), CH4/CO2Value is largeSmall, is an index for measuring the quality of the biogas. It can be seen from the figure that the quality of biogas from the first batch of tests is significantly better than that from the second batch. CH of control experiment group and each experiment group after addition4/CO2The values are respectively: 2.80, 1.52, 3.20, 3.09, 3.56, 2.18, 3.63 and 2.00, 1.78, 2.24, 2.42, 2.65, 2.59, 2.94, with the most significant effect being 1.5% nFe2O3And 1.5% nFe3O4The improvement is 29.89 percent and 47.24 percent respectively compared with the blank experiment group. During the fermentation process, CO2Even if the intermediate product of the liquefaction stage is used as acetic acid and CH in the acidogenesis stage and the methanogenesis stage4The raw material formed, therefore CH4/CO2A large value indicates a greater activity of hydrogen consuming acetogens and methanogens.
FIG. 12 is Fe2O3、nFe2O3，Fe3O4、nFe3O4On the influence of VS removal rate in the mixed anaerobic fermentation process of kitchen waste and pennisetum hybrid, after the additive is added, the VS removal rate of each experimental group is higher than 82%, but is reduced compared with the respective control experimental group, the VS removal rate of each experimental group in two batches of experiments is 84.62%, 83.70%, 84.32%, 84.35%, 82.77%, 82.67%, 83.77%, 84.30%, 83.18%, 83.16%, 83.93%, 83.30%, 83.23% and 82.48%, although the VS removal rate is reduced by the addition of the additive, the reduction of the cumulative gas production rate is not caused, especially the reduction of 0.5% Fe2O3And 0.5% Fe3O4This phenomenon also demonstrates that the gas production per gram of VS feedstock is enhanced by the addition of additives.
FIG. 13 shows the effect of COD removal rate in the anaerobic fermentation process of kitchen waste and hybrid pennisetum, which is known from the curve of COD value change, 0.5% Fe2O3、0.5％nFe2O3、1.0％Fe3O4、0.5％nFe3O4、1.0％nFe3O4、1.5％nFe3O4The COD release of the compound is higher than that of the respective control experiment group, and the removal rate of the COD is Fe2O3And nFe2O3All are reduced after being addedLow, and Fe3O4And nFe3O4The COD value is improved by 13.02%, 19.50%, 0.41%, 0.97%, 12.26% and 5.21% respectively by adding the three dosages, and the best effect is 1.0% of Fe3O4。
To sum up, for Fe2O3，nFe2O3And Fe3O4，nFe3O4The addition of four different additives to improve gas production and gas composition is 0.5% Fe2O3And 0.5% Fe3O4Cumulative gas production and CH thereof4The yield is 1716.1mL, 829.1mL, 1854.7mL and 874.0mL respectively, which are improved by 23.50 percent, 37.92 percent and 27.27 percent and 26.82 percent relative to a blank control group; to CH4/CO2The most influential was 1.5% nFe2O3And 1.5% nFe3O4The improvement is 29.23 percent and 47.25 percent respectively compared with a blank group; 1.0% Fe3O4The VS removal rate is improved by 19.50 percent compared with that of a control experiment group.
Combining the results of examples 1 and 2, it can be seen that 0.5% IP has the best effect of promoting the stability and biogas content of the mixed anaerobic fermentation system of kitchen waste and hybrid pennisetum alopecuroides.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A method for strengthening gas production by co-fermentation of kitchen waste and hybrid pennisetum alopecuroides is characterized by comprising the following steps:
s1, removing redundant moisture and surface grease of the kitchen waste, crushing the kitchen waste into slurry, and uniformly stirring the slurry;
s2, removing roots of the hybrid pennisetum alopecuroides and crushing;
and S3, transferring the kitchen waste and the hybrid pennisetum alopecuroides to an anaerobic fermentation tank, adding an iron additive into the fermentation tank, inoculating sludge, and performing anaerobic fermentation.
2. The method according to claim 1, wherein the iron additive comprises one or more of reduced iron powder, ferrous oxide, nano zero-valent iron, ferric oxide, nano ferric oxide, ferroferric oxide and nano ferroferric oxide.
3. The method of claim 1, wherein the ratio of volatile solid content (VS) of the kitchen waste to the hybrid pennisetum is: 0.5-9.5: 0.5-9.5.
4. The method of claim 1, wherein the iron-based additive is present in an amount of 0.1-1.5% of the total fresh weight of the kitchen waste and the hybrid pennisetum alopecuroides.
5. The method of claim 1, wherein the amount of sludge inoculated is 37-46% of the volatile solids content (VS) of the kitchen waste and the pennisetum hydridum.
6. The method as claimed in claim 1, wherein the stirring speed during the anaerobic fermentation process is 110-130r/min, and the stirring frequency is 2-3min for stirring every 8-10 min.
7. The method of claim 1, wherein the fermentation temperature during the anaerobic fermentation is 35-38 ℃.
8. The method of claim 1, wherein the fermentation broth organic load during the anaerobic fermentation is 6-15g VS/L.
9. The method of any one of claims 1-8, wherein said hybrid pennisetum alopecuroides is a perennial herbaceous C4 plant of a triploid hybrid formulated with the sterile line of pennisetum americanum tif 23A as female parent and with the male parent pennisetum purpureum N51.
10. Use of the method according to any one of claims 1 to 8 for the preparation of biogas by fermentation of kitchen waste.
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