CN105420282A - Method for improving straw and excrement mixed anaerobic digestion gas production performance by biochemical pretreatment of maize straw - Google Patents
Method for improving straw and excrement mixed anaerobic digestion gas production performance by biochemical pretreatment of maize straw Download PDFInfo
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Abstract
A method for improving straw and excrement mixed anaerobic digestion gas production performance by biochemical pretreatment of maize straw belongs to the field of anaerobic digestion of organic solid waste, and comprises the following steps: extracting biogas liquid from a biogas liquid pool, and sieving with a sieve; crushing straw, uniformly mixing the crushed straw with the biogas liquid, placing the obtained mixture in a closed vessel, and pretreating in a thermostat at 35 DEG C for 1 to 3 days; uniformly mixing the obtained material with excrement, inoculating anaerobic digestion sludge, adjusting the pH, adding water for dilution and performing moderate-temperature anerobic fermentation. Compared with the prior art, the method has the following benefits: (1) the pretreatment time is remarkably shortened by 5-14 days; (2) the anerobic fermentation period is remarkably shortened by 23.08-43.59%; (3) the yield of methane is remarkably improved by 25.72-36.55%; (4) the process is simple, the cost is low, and the operation is easy.
Description
Technical field
The invention belongs to organic solid castoff anaerobic digestion field, be specifically related to a kind of method being digested gas generation property by biochemical pre-treatment maize straw raising stalk and ight soil mixing anaerobic.
Background technology
China is traditional large agricultural country, and produce agricultural crop straw amount per year and reach more than 800,000,000 ton, wherein maize straw output reaches 2.84 hundred million tons.Because can not timely and effectively utilize, most maize straw is stacked by open incineration or field, and major polluting atmosphere environment wastes resource simultaneously.Anaerobic digestion techniques has been proved to be the important method for effectively obtaining biomass energy, has the advantage such as less energy-consumption, high production capacity, at present in China's industrial applications and mass-producing demonstration widely.
Be that raw material carries out anaerobically fermenting with stalk, yield poorly, the cycle is long.Its major cause is: main moiety (Mierocrystalline cellulose, hemicellulose and the xylogen) complex structure of (1) stalk, is difficult to be directly used by the microbe; (2) nutrition is unbalanced, and C/N is than too high.
Generally by carrying out stalk pretreatedly improving the utilization ratio of microorganism to stalk.Physical is to shear, to pulverize, fast simple and easy, but does not fundamentally change the crystalline structure of lignocellulose.Chemical method is based on acid-alkali treatment, and input-output are higher, but has that liquid waste disposal, equipment requirements are high, alkali lye suppresses the problems such as methane phase bacillus growth risk.The advantages such as biological process has non-chemically, less energy-consumption, environmental friendliness become study hotspot, but existing white-rot fungi or composite fungus agent method for pretreating cost is high, technical difficulty is large.
Natural pond liquid is generally high concentrated organic wastewater, not only containing a large amount of nitrogen, phosphorus, potassium and organism, and is rich in enzyme and lignocellulose degrading bacteria.Document: Chu Lili etc. the impact (agricultural research in the arid areas of natural pond liquid pre-treatment wheat stalk anaerobic fermentation gas production characteristic, 2011,29 (1): 247-251.) research finds: the VS cumulative gas production using liquid pre-treatment wheat straw in natural pond to carry out anaerobically fermenting after 8-15 days increases 15.42%-31.53%, and methane average content is 64%-71%.Its weak point is that natural pond liquid pretreatment time is oversize, and significant loss is too many, and methane ultimate production is lower.
Chinese patent CN101899474A adopts natural pond liquid as promotor, carry out pre-treatment, but pretreatment time is long to stalk.Patent CN102586333A is by reuse part natural pond liquid pre-treatment wheat straw, but the accumulation of ammonia nitrogen suppresses the growth of anerobe, but index is many, operation easier is large.
Summary of the invention
For difficult degradation in anaerobic fermentation process and the unbalanced defect of nutrition, the present invention is proposed.The object of the present invention is to provide a kind of method being improved stalk and ight soil mixing anaerobic gas generation property by biochemical pre-treatment maize straw, there is simple to operate, that degradation rate is fast, pretreatment time is short and fermentation substrate C/N ratio is balanced feature.
Technical solution of the present invention comprises following content:
(1) stalk prepares
Get air-dry maize straw, be first cut into 3 ~ 4 centimetres, then it is for subsequent use to pulverize kept dry with the pulverizer of band 20 eye mesh screen.
(2) natural pond liquid and preparation method thereof
Natural pond liquid takes from the form anaerobic fermentation methane pond discharging of normal operation more than 1 year fermentation stability, and (natural pond liquid pH is at 6.9-7.2, ammonia nitrogen is at 200-1500mg/L, basicity is at 2000-6000mg/L), standing sedimentation 2-7 days, after filtering a part of water, ensure that natural pond liquid dry weight TS is at 2%-4%, then respectively natural pond liquid is crossed 5-40 eye mesh screen, it is for subsequent use that the natural pond liquid prepared puts into 4 DEG C of refrigerators.
(3) pretreatment process
Take the some parts of maize straw and be placed in sealed vessel respectively, add natural pond liquid (the crossing 5-40 eye mesh screen) mixing of maize straw dry weight TS1-6 different concns doubly, control every part of pretreated total solid concentration scope of maize straw is 10%-25% simultaneously, and after stirring, sealing is placed in 35 DEG C of thermostat container pre-treatment 1-6 days.
(4) pretreatment time defining method
Take the maize straw of certain mass, be placed in sealed vessel, natural pond liquid (solids content 10%-25% is exactly water ratio 75%-90%) is added by total solid concentration (10%-25%) two factors in different lettuce (crossing the natural pond liquid of 5-40 mesh filter screen) and preprocessing process, stir with glass stick, sealing is placed in 35 DEG C of thermostat container pre-treatment 1-6 days respectively, measuring the pH of material in encloses container every day, completing when pH value is not considered as pre-treatment when declining.The best pretreatment time of present method gained is 1-3 days, (see Fig. 1).
(5) operation steps
Specific practice: the maize straw of natural air drying is first cut into 3 ~ 4 centimetres, then save backup after pulverizing with the pulverizer of band 20 eye mesh screen.Take maize straw 39g (calculating by TS) some parts respectively, be placed in the blue lid bottle of 1L respectively, add the form anaerobic fermentation methane pond discharging of taking from normal operation 1 year fermentation stability by the different lettuce natural pond liquid of mesh filter screen (cross 5-40) and total solid concentration (10%-25%) two factors and guarantee natural pond liquid dry weight TS at the natural pond liquid of 2%-4%, stir with glass stick, sealing is placed in 35 DEG C of thermostat container pre-treatment 1-3 days.
(6) anaerobic digestion
The maize straw of pre-treatment gained is mixed (mixing by TS dry weight 3:1) with from the fresh cow dung of plant or pig manure, (pH is at 7.0-8.0 to add normal operation sewage work anaerobic digester mud, ammonia nitrogen is at 200-1500mg/L, basicity is at 2000-6000mg/L) inoculum 15gMLSS/L, regulate pH to pH6.8-7.2, being diluted with water to volume is be sealed in the isothermal reactor of 35 ± 1 DEG C after the 80%-90% of reactor cumulative volume to carry out mesophilic anaerobic digestion process 50 days.
To measure before and after pre-treatment and wood fibre cellulose content, total solids level TS, total volatile solid(s) (TVS) content VS, pH, ammonia nitrogen, basicity, methane percentage composition and daily output methane quantity before and after anaerobic digestion.The effect of all data for digesting with ight soil mixing anaerobic after evaluating natural pond liquid pre-treatment maize straw.
Compared with prior art, the present invention has following beneficial effect:
(1) pretreatment time obviously shortens.Pretreatment time of the present invention is only 1-3 days, and in the invention such as Chu Lili, pretreatment time is 8-15 days, shortens 5-14 days.In addition, relative to oxygenation pretreatment method, the present invention is simple to operate, with low cost, and does not need to regulate C/N, is a kind of pretreatment process of economical and efficient.
(2) the anaerobically fermenting cycle obviously shortens.Under 35 ± 1 DEG C of conditions, to digest acidifying lag phase not obvious for natural pond liquid pre-treatment maize straw and cow dung mixing anaerobic, enters rapidly methane phase peak period, obviously shortens the anaerobic digestion cycle.Be 35 DEG C for pretreatment temperature, the anaerobic digestion that the natural pond liquid pretreated straw of pretreatment time 1-3 days mixes with cow dung, T
80for 22-30 days, within 39 days, shorten 23.08%-43.59% than non-pretreated group, greatly saved running cost, be more suitable for industrial production.
(3) methane production significantly improves.In whole anaerobic digestion process, through each concentration natural pond liquid (5-40 order) by different solids concn (10%-25%) pre-treatment maize straw with the VS methane production that cow dung mixing anaerobic digests obtains respectively 36.55%, 25.72%, 29.31% and 32.58% extremely significantly promote relative non-pretreated group.
Accompanying drawing explanation
Fig. 1 pH is with the variation diagram of pretreatment time
Fig. 2 day methane production over time
Embodiment
In following all experiments, anaerobic digestion experimental installation is volume is the blue lid bottle of 1L, and 1L wide-necked bottle, 1L beaker and Glass tubing, emulsion tube connect to form.Stalk was the maize straw that 20 eye mesh screen pulverizers are pulverized, and addition is 39gTS.Natural pond liquid is taken from and normal is run anaerobically fermenting pond, and ight soil is fresh cow dung from plant or pig manure.Inoculum is normal operation sewage work anaerobic digester, and add-on is 15gMLSS/L.
Embodiment 1
Getting 48 parts of weight is 39g maize straw (in TS), with dry weight TS at the natural pond liquid natural pond liquid of 5 orders, 10 orders, 20 orders and 40 mesh filter screens (cross) of 2%-4% and total solid concentration (10%, 15%, 20% and 25%) two factor design total divisor Pretreatment Tests.Above-mentioned natural pond liquid is added in 48 parts of maize straws respectively and is sealed in 35 DEG C of pre-treatment 3 days.
Add 13g cow dung (in TS) and 12g after pre-treatment terminates normally to run sewage work's anaerobic digester mud (using TS) and carry out anaerobic digestion as inoculum mixing and react 50 days.Produce methane quantity every day by drainage record, measure methane percentage composition every day simultaneously, calculate methane ultimate production, then calculate T
80.Experimental result is as follows:
Table 1 anaerobic digestion out-feed liquid character
Table 1 is depicted as anaerobic digestion and terminates rear TS, VS methane production, T
80, pH, ammonia nitrogen, the anaerobic digestion property analysis such as basicity and VFA content.Natural pond liquid Pretreatment Test group VS methane production rate is 196.43-238.35mL/gVS, improves 20.19%-45.84%, T than non-pretreated group (163.43mL/gVS)
80for 22-30, shorten 23.08%-43.59% than non-pretreated group (39).Wherein, when pre-treatment natural pond, liquid crosses 5 eye mesh screens, when solids concn is 15%, and anaerobic digestion VS methane production rate the highest (238.35mL/gVS), T
80the shortest (22), and its TS, VS clearance is respectively 43.80%, 53.17%, apparently higher than non-pretreated group (42.88% and 50.34%).Visible, natural pond liquid pre-treatment obviously shortens anaerobic digestion time, improves load methane production rate.
As the important indicator evaluating batch anaerobic digestion performance and bacteria metabolism state, when out-feed liquid VFA content higher than 5600mg/L, pH<6.8 time, the methane phase process of system will be suppressed.From table 1, this tests each group of discharging VFA, and pH is all in the optimum range of growth methanotrophic bacterial strain.Meanwhile, each group ammonia nitrogen and basicity also all in the suitableeest scope (ammonia nitrogen <2000mg/L, basicity >4000mg/L) of anerobe growth, effectively can improve the surge capability of Digestive tract, maintain the stability of system.
Embodiment 2
Take four parts of maize straws, every part of maize straw amount is 30g (in TS), utilize 5 eye mesh screens to taking from the pure stalk of normal operation 1 year fermentation stability, stalk pig manure 3:1 mix, the form anaerobic fermentation methane pond discharging of pure meal kitchen is filtered, by the natural pond liquid after filtering according to 6 times of maize straw dry weight TS respectively with pulverize after maize straw fully mix.Be sealed in valve bag by pretreated maize straw, pre-treatment 3 days under 35 DEG C of conditions, control group is unpretreated maize straw.
Normally run sewage work's anaerobic digester mud through pretreated maize straw and 10g pig manure (in TS) and 12g to make (in TS) for inoculum and mix, be added in anaerobic digestion reaction vessel, add tap water to 80% of reactor volume.Will add material inflated with nitrogen and sealing reactor be put in 35 DEG C of shaking tables, shake.By the gas production rate of draining water gathering of gas law record every day, and measure the methane content of aerogenesis every day, calculate total methane production, Fig. 2 is shown in day methane production change.
Anaerobic digestion reaction terminates rear calculating T
80, experimental result is as shown in table 2 below
Table 2 anaerobic digestion T
80the aerogenesis cycle
As can be seen from Figure 2, have through natural pond liquid pretreated maize straw methane aerogenesis peak in various degree in advance, from table 2, when adopting different natural ponds liquid to carry out pre-treatment, T
80shorten to 22 ~ 25 days, improve 30.56% ~ 38.89% compared to non-pre-treatment maize straw.
Calculate under the liquid pre-treatment of different natural ponds at respective T
80unit TS and unit VS methane production in time, result is as table 3:
Table 3 unit TS, VS methane production
As can be seen from Table 3, anaerobic digestion through the respective T80 time is reacted, stalk pig manure 3:1 mixing natural pond liquid pretreated maize straw anaerobically fermenting methane production is significantly increased compared to unpretreated maize straw, its unit TS methane phase quantity and its unit VS methane production all improves 1.64 times, for pure straw biogas liquid and the pretreated maize straw of meal natural pond, kitchen liquid, unit TS methane phase quantity and its unit VS methane production improves 1.44 ~ 1.48 times compared to non-pre-treatment maize straw.
Claims (1)
1. digested a method for gas generation property by biochemical pre-treatment maize straw raising stalk and ight soil mixing anaerobic, its feature comprises the steps:
(1) stalk prepares
Get air-dry maize straw, be first cut into 3 ~ 4 centimetres, then it is for subsequent use to pulverize kept dry with the pulverizer of band 20 eye mesh screen;
(2) natural pond liquid and preparation method thereof
Natural pond liquid takes from the form anaerobic fermentation methane pond discharging of normal operation more than 1 year fermentation stability, standing sedimentation 2-7 days, after filtering a part of water, ensures that natural pond liquid dry weight TS is at 2%-4%, then respectively natural pond liquid is crossed 5-40 eye mesh screen, it is for subsequent use that the natural pond liquid prepared puts into 4 DEG C of refrigerators;
(3) pretreatment process
Take the some parts of maize straw and be placed in sealed vessel respectively, add the natural pond liquid mixing of maize straw dry weight TS1-6 different concns doubly respectively, control every part of pretreated total solid concentration scope of maize straw is 10%-25% simultaneously, and after stirring, sealing is placed in 35 DEG C of thermostat container pre-treatment 1-3 days;
(4) anaerobic digestion
The maize straw of pre-treatment gained is mixed with mixing by TS dry weight 3:1 from the fresh cow dung of plant or pig manure, add normal operation sewage work anaerobic digester sludge seeding thing 15gMLSS/L, regulate pH to pH6.8-7.2, being diluted with water to volume is be sealed in the isothermal reactor of 35 ± 1 DEG C after the 80%-90% of reactor cumulative volume to carry out mesophilic anaerobic digestion process 50 days.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105967481A (en) * | 2016-06-16 | 2016-09-28 | 安徽工业大学 | Composite ingredient for prompting anaerobic fermentation of cow dung to produce methane |
| CN106929539A (en) * | 2017-03-16 | 2017-07-07 | 黑龙江省农业科学院农村能源研究所 | A kind of method that cow dung improves biogas output with pretreatment maize straw simultaneous digestion |
| CN107475302A (en) * | 2016-11-25 | 2017-12-15 | 成都德通环境工程有限公司 | A kind of method using pineapple bran or mango slag as the anaerobic fermentation methane phase of raw material |
| CN108103111A (en) * | 2018-02-28 | 2018-06-01 | 成都德通环境工程有限公司 | A kind of method of Chinese medicine slag fermentation methane production |
| CN108384813A (en) * | 2018-03-26 | 2018-08-10 | 北京化工大学 | A kind of method of calcium oxide and biogas slurry combined pretreatment raising rice straw anaerobic digestion gas production performance |
| CN108570481A (en) * | 2017-08-31 | 2018-09-25 | 东北师范大学 | A method of preparing biogas by primary raw material of maize straw |
| CN108998478A (en) * | 2018-07-26 | 2018-12-14 | 大连海川博创环保科技有限公司 | A kind of pre-treating technology and system of the anaerobic digestion of cultural solid debirs |
| CN109082446A (en) * | 2018-07-30 | 2018-12-25 | 北京化工大学 | A kind of method that photocatalysis pretreatment improves Anaerobic Digestion of Straw gas generation property |
| CN109929881A (en) * | 2019-03-20 | 2019-06-25 | 北京科技大学 | A kind of method that biogas slurry dipping pretreatment reinforcing straw produces biogas efficiency |
| CN110079559A (en) * | 2019-04-24 | 2019-08-02 | 杭州能源环境工程有限公司 | A kind of dry yellow stalk pretreatment technique for anaerobic fermentation |
| CN110628830A (en) * | 2019-11-05 | 2019-12-31 | 湖北正江环保科技有限公司 | Application method of biogas slurry in anaerobic fermentation of rice straw to produce biogas |
| CN110982847A (en) * | 2019-12-02 | 2020-04-10 | 刘辉 | Method for improving source separation brown water anaerobic digestion methane production by utilizing peanut straw co-fermentation |
| CN111172198A (en) * | 2019-12-30 | 2020-05-19 | 哈尔滨工业大学 | Biogas slurry pretreatment method for lignocellulose biomass and method for producing biogas by using biogas slurry pretreatment method |
| CN112430631A (en) * | 2020-12-23 | 2021-03-02 | 江南大学 | Application of alkali-treated biogas residue in methane production |
| CN114181977A (en) * | 2022-01-24 | 2022-03-15 | 中国农业大学 | Pretreatment method for enhancing methane production performance of straws by using anaerobic fermentation self-product and application |
| CN114736934A (en) * | 2022-05-24 | 2022-07-12 | 东北师范大学 | Method for promoting anaerobic co-fermentation of animal manure and straw to prepare biogas by adding biochar |
| CN114736933A (en) * | 2022-05-24 | 2022-07-12 | 东北师范大学 | Method for promoting anaerobic co-fermentation of animal manure and straw to prepare biogas by adding diatomite |
| CN114907000A (en) * | 2022-04-28 | 2022-08-16 | 同济大学 | High-protein organic solid waste reinforced anaerobic conversion method based on carbon-nitrogen ratio blending |
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| CN106929539A (en) * | 2017-03-16 | 2017-07-07 | 黑龙江省农业科学院农村能源研究所 | A kind of method that cow dung improves biogas output with pretreatment maize straw simultaneous digestion |
| CN106929539B (en) * | 2017-03-16 | 2021-02-19 | 黑龙江省农业科学院农村能源研究所 | Method for improving biogas yield through combined digestion of cow dung and pretreated corn straws |
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| CN108998478A (en) * | 2018-07-26 | 2018-12-14 | 大连海川博创环保科技有限公司 | A kind of pre-treating technology and system of the anaerobic digestion of cultural solid debirs |
| CN108998478B (en) * | 2018-07-26 | 2020-10-02 | 大连海川博创环保科技有限公司 | Pretreatment process and system for anaerobic digestion of agricultural solid organic waste |
| CN109082446A (en) * | 2018-07-30 | 2018-12-25 | 北京化工大学 | A kind of method that photocatalysis pretreatment improves Anaerobic Digestion of Straw gas generation property |
| CN109929881A (en) * | 2019-03-20 | 2019-06-25 | 北京科技大学 | A kind of method that biogas slurry dipping pretreatment reinforcing straw produces biogas efficiency |
| CN110079559A (en) * | 2019-04-24 | 2019-08-02 | 杭州能源环境工程有限公司 | A kind of dry yellow stalk pretreatment technique for anaerobic fermentation |
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| CN110982847A (en) * | 2019-12-02 | 2020-04-10 | 刘辉 | Method for improving source separation brown water anaerobic digestion methane production by utilizing peanut straw co-fermentation |
| CN111172198A (en) * | 2019-12-30 | 2020-05-19 | 哈尔滨工业大学 | Biogas slurry pretreatment method for lignocellulose biomass and method for producing biogas by using biogas slurry pretreatment method |
| CN112430631A (en) * | 2020-12-23 | 2021-03-02 | 江南大学 | Application of alkali-treated biogas residue in methane production |
| CN114181977A (en) * | 2022-01-24 | 2022-03-15 | 中国农业大学 | Pretreatment method for enhancing methane production performance of straws by using anaerobic fermentation self-product and application |
| CN114907000A (en) * | 2022-04-28 | 2022-08-16 | 同济大学 | High-protein organic solid waste reinforced anaerobic conversion method based on carbon-nitrogen ratio blending |
| CN114736934A (en) * | 2022-05-24 | 2022-07-12 | 东北师范大学 | Method for promoting anaerobic co-fermentation of animal manure and straw to prepare biogas by adding biochar |
| CN114736933A (en) * | 2022-05-24 | 2022-07-12 | 东北师范大学 | Method for promoting anaerobic co-fermentation of animal manure and straw to prepare biogas by adding diatomite |
| CN114736933B (en) * | 2022-05-24 | 2024-01-19 | 东北师范大学 | Method for preparing biogas by promoting anaerobic co-fermentation of livestock manure straw by adding diatomite |
| CN114736934B (en) * | 2022-05-24 | 2024-03-26 | 东北师范大学 | Method for preparing biogas by promoting anaerobic co-fermentation of livestock manure straw by adding biochar |
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