CN104561111A - Method for increasing anaerobic digestion and gas production properties by using methanation discharged material to acidify and pre-process corn straws - Google Patents
Method for increasing anaerobic digestion and gas production properties by using methanation discharged material to acidify and pre-process corn straws Download PDFInfo
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- CN104561111A CN104561111A CN201510012955.3A CN201510012955A CN104561111A CN 104561111 A CN104561111 A CN 104561111A CN 201510012955 A CN201510012955 A CN 201510012955A CN 104561111 A CN104561111 A CN 104561111A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention relates to a method for increasing anaerobic digestion and gas production properties by using a methanation discharged material to acidify and pre-process corn straws, belonging to the field of high-efficiency resource utilization of corn straws. The method disclosed by the invention comprises the following steps of: acidifying water after pre-processing, acidifying a substance to be inoculated, namely a semi-continuous methane-phase discharged material, adding tap water till the volume is 80% of the total volume of a reaction container, introducing nitrogen after uniformly mixing, sealing by using a rubber plug, fixing a blue cap bottle in a shaking table, and controlling the temperature at constant 40+/2 DEG C; measuring the pH value by using a pH meter in a timed manner every day, and stopping acidifying when the pH value is lower than 5.5; and taking the acidified discharged material as the raw material after completing methanation start, and feeding and discharging for one time in a timed manner every day, wherein the feeding and discharging volumes are equal, and the HRT (Hydraulic Retention Time) is 40 days. The anaerobic fermentation discharged material is used for acidifying to carry out secondary fermentation, and microbial bacteria in the discharged material are used for rapidly acidifying the corn straws, so that the acidification time is shortened; and the microbial bacteria come from the anaerobic fermentation discharged material when the secondarily acidified material is subjected to methanation, and thus, the stability of an anaerobic system is increased easily.
Description
Technical field
The invention belongs to maize straw high-efficiency resource recycling technical field, is a kind ofly utilize anaerobically fermenting discharging to improve the method for anaerobic digestion gas production performance as the mode of inoculum process maize straw.
Background technology
Maize straw belongs to cellulose series biomass, containing abundant nutrition and the easy chemical composition utilized, be abundant renewable organic substance, but wherein major part is dropped or open incineration, causes the serious problems such as the wasting of resources, environmental pollution, obstruction normal traffic.
Maize straw is primarily of the large composition composition of Mierocrystalline cellulose, hemicellulose and xylogen three, and utilize anaerobic digestion techniques processing and utilizing maize straw, producing efficient, clean high-quality biological mass-energy source---biogas, is the effective way that maize straw resourceization utilizes.But hemicellulose is combined between Mierocrystalline cellulose and xylogen as molecule tamanori, cellulosic molecule is embedded in wherein, form a kind of natural cover for defense, enzyme is not easily contacted with cellulosic molecule, cause lignocellulosic material to be difficult to be degraded by microorganisms, limit the large-scale application of maize straw for biogas production aspect.
In anaerobic fermentation process, because feed stock conversion is low, cause discharging a large amount of natural pond slag, natural pond liquid, easily secondary pollution is produced to environment.Anaerobically fermenting is a complicated biotransformation, comprise hydrolysis/souring stage and biomass energy transformation stage, and be hydrolyzed/acidifying is the main rate-limiting step that methane phase is applied, some researchers are had to be devoted to the technical study of Applied Physics method, chemical process and biological method or combined method pretreated straw, such as acidolysis, alkaline hydrolysis and various aerobic, anaerobic cellulose degradation bacterial agent, also achieve certain effect.In anaerobic digestion process, the microbial population that hydrolysis/souring stage plays a role mainly acid-producing bacteria, the microbial population that the biomass energy transformation stage plays a role mainly methanogen.
Therefore, the present invention follows the principle of changing waste into resources, two reactors are utilized to be separated by anaerobic stages, microbial population main is separately made to be separated and to play maximum effect, utilize anaerobic fermented liquid discharging to carry out acidification to maize straw simultaneously, natural pond slag, the discharge of natural pond liquid can be reduced, increase material clearance, improve anaerobic digestion gas production performance.The present invention explores natural pond slag and natural pond liquid recycling new technology approach after anaerobically fermenting, the degree of in-depth waste ' s reclamation, transforms provide feasibility foundation and reference for avoiding secondary pollution and realizing maize straw high level; In Practical Project operation, realize stable, the Effec-tive Function of system, reduce operation energy consumption and set up multiple dimensioned control technique etc.
Summary of the invention
The present invention utilizes anaerobically fermenting discharging to improve anaerobic digestion gas production performance as the mode of inoculum pre-treatment maize straw.
Methanation discharge acidification pre-treatment maize straw improves the method for anaerobic digestion gas production performance, it is characterized in that:
Select through natural air drying and the maize straw do not gone mouldy, be crushed to below 20 orders with pulverizer, pretreating reagent is water, and its addition is six times of maize straw dry weight.Homogeneous phase mixing is placed on sealing in 40 ± 2 DEG C of environment and preserves, and pretreatment time is 1 day.
Acidifying after pre-treatment, acidifying needs inoculum, and inoculum is the discharging of semi continuous methane phase, and its dry biomass percentage concentration is 55%.To pretreated maize straw relative to the semi continuous methane phase discharging adding 100mL-700mL in 52g TS, add tap water again to 80% of reaction vessel cumulative volume, after Homogeneous phase mixing, be filled with nitrogen, then rubber stopper seal is used, and indigo plant is covered bottle and be fixed in shaking table, shaking table homo(io)thermism is between 40 ± 2 DEG C.Timing every day pH meter measures pH, when pH lower than 5.5 time, stopping acidification.
Semi continuous methanation starts.Utilize CSTR reactor as anaerobic reaction device, reaction volume 8L.First in reactor, add 120g TS anaerobic sludge, then add pretreated maize straw 520g TS, then add tap water to 80% of reaction unit cumulative volume, be filled with nitrogen, temperature of reactor is set between 35 ± 2 DEG C.In contrast with untreated maize straw simultaneously.When pH reaches 7 in question response device, show that semi continuous methanation has started.
After semi continuous methanation has started, using the discharging of acidifying as raw material, once, charging is equal with discharging volume, and HRT is 40 days, and described discharging is referred to as the discharging of semi continuous methane phase for timing charging every day, discharging.
The semi continuous methane phase discharging that acidifying needs owing to just starting also there is no output, employing be the semi continuous methane phase discharging of other equipment output, then adopt in equipment of itself.
Concrete:
(1) stalk pre-treatment.The present invention selects through natural air drying and the maize straw do not gone mouldy, and is crushed to below 20 orders, takes a certain amount of maize straw with crucible with pulverizer, is placed in 105 DEG C of baking ovens, measures maize straw TS after 12 hours.Utilize blue lid bottle (1L) as anaerobic reaction container, reaction volume 0.8L, according to maize straw load 65g TS/L, first take 52g TS maize straw.Pretreating reagent of the present invention is water (tap water), and its addition is six times (312mL) of maize straw dry weight.Homogeneous phase mixing is placed on sealing in 40 ± 2 DEG C of environment and preserves, and pretreatment time is 1 day.
(2) batch acidifying.Anaerobic fermentation process needs inoculum, and the present invention's inoculum used is the discharging of semi continuous methane phase, and its dry substance concentration is 55%.The methanation discharging of 100mL-700mL is added in pretreated maize straw (52g TS), add tap water again to 80% of reaction vessel cumulative volume, after Homogeneous phase mixing, be filled with nitrogen, then rubber stopper seal is used, and indigo plant is covered bottle and be fixed in shaking table, shaking table homo(io)thermism is between 40 ± 2 DEG C.Timing every day pH meter measures pH, when pH lower than 5.5 time, stopping acidification.
(3) semi continuous methanation starts.Utilize CSTR reactor as anaerobic reaction device, reaction volume 8L.First in reactor, add 120g TS anaerobic sludge, then add pretreated maize straw 520g TS, then add tap water to 80% of reaction unit cumulative volume, be filled with nitrogen, temperature of reactor is set between 35 ± 2 DEG C.In contrast with untreated maize straw simultaneously.When pH reaches 7 in question response device, show that methanation has started.
(4) semi continuous methanation runs.After to be pre-treated group of methane phase has started mutually with untreated fish group methane, using the discharging of pretreated group batch acidifying as the raw material of the methane phase of pretreated group, simultaneously using the discharging of untreated fish group batch acidifying as the raw material of the methane phase of untreated fish group.Every morning 8 chargings, discharging once, are 200mL, and HRT is 40 days.Timing every day measures and records methane content and daily output tolerance, Simultaneously test discharging TS concentration.
The present invention has following beneficial effect:
1) utilize tap water to carry out pre-treatment to maize straw 40 DEG C time, can also pretreating effect be improved while minimizing environmental pollution, increase the biological degradability of maize straw.
2) anaerobically fermenting discharging is used to acidifying, carries out Secondary Fermentation, and the microorganism species in discharging can carry out rapid acidification to maize straw, shortens acidificatoin time; When material after after-souring carries out methanation, microorganism species wherein comes from anaerobically fermenting discharging, contributes to the stability strengthening anaerobic system.
3) secondary anaerobically fermenting can reduce natural pond liquid and the discharge of natural pond slag, reduces the secondary pollution to environment, can improve the plant efficiency of dry-matter clearance and semi continuous anaerobic reactor.
4) at the end of semi continuous anaerobic reaction, compared with non-pretreated group, the volume yield rate of pretreated group improves 56%-80%, reaches 0.70-0.81; Methane content improves 22%-59%, reaches 55%-63%; Maize straw TS clearance improves 46%-71%, reaches 60%-70%.
Embodiment
Embodiment 1:
(1) stalk pre-treatment.The present invention selects through natural air drying and the maize straw do not gone mouldy, and is crushed to below 20 orders, takes a certain amount of maize straw with crucible with pulverizer, is placed in 105 DEG C of baking ovens, measures maize straw TS after 12 hours.Utilize blue lid bottle (1L) as anaerobic reaction container, reaction volume 0.8L, according to maize straw load 65g TS/L, first take 52g TS maize straw.Pretreating reagent of the present invention is water (tap water), and its addition is six times (312mL) of maize straw dry weight.Homogeneous phase mixing is placed on sealing in 40 ± 2 DEG C of environment and preserves, and pretreatment time is 1 day.
(2) batch acidifying.Anaerobic fermentation process needs inoculum, and the present invention's inoculum used is the discharging of semi continuous methane phase, and its dry substance concentration is 55%.The methanation discharging of 100mL is added in pretreated maize straw (52g TS), add tap water again to 80% of reaction vessel cumulative volume, after Homogeneous phase mixing, be filled with nitrogen, then rubber stopper seal is used, and indigo plant is covered bottle and be fixed in shaking table, shaking table homo(io)thermism is between 40 ± 2 DEG C.Timing every day pH meter measures pH, when pH lower than 5.5 time, stopping acidification.
(3) semi continuous methanation starts.Utilize CSTR reactor as anaerobic reaction device, reaction volume 8L.First in reactor, add 120g TS anaerobic sludge, then add pretreated maize straw 520g TS, then add tap water to 80% of reaction unit cumulative volume, be filled with nitrogen, temperature of reactor is set between 35 ± 2 DEG C.In contrast with untreated maize straw simultaneously.When pH reaches 7 in question response device, show that methanation has started.
(4) semi continuous methanation runs.After to be pre-treated group of methane phase has started mutually with untreated fish group methane, using the discharging of pretreated group batch acidifying as the raw material of the methane phase of pretreated group, simultaneously using the discharging of untreated fish group batch acidifying as the raw material of the methane phase of untreated fish group.Every morning 8 chargings, discharging once, are 200mL, and HRT is 40 days.Timing every day measures and records methane content and daily output tolerance, Simultaneously test discharging TS concentration.
Above-described embodiment effect is: at the end of semi continuous anaerobic reaction, and compared with non-pretreated group, the volume yield rate of pretreated group improves 56%, reaches 0.70; Methane content improves 22%, reaches 55%; Maize straw TS clearance improves 46%, reaches 60%.
Embodiment 2:
(1) stalk pre-treatment.The present invention selects through natural air drying and the maize straw do not gone mouldy, and is crushed to below 20 orders, takes a certain amount of maize straw with crucible with pulverizer, is placed in 105 DEG C of baking ovens, measures maize straw TS after 12 hours.Utilize blue lid bottle (1L) as anaerobic reaction container, reaction volume 0.8L, according to maize straw load 65g TS/L, first take 52g TS maize straw.Pretreating reagent of the present invention is water (tap water), and its addition is six times (312mL) of maize straw dry weight.Homogeneous phase mixing is placed on sealing in 40 ± 2 DEG C of environment and preserves, and pretreatment time is 1 day.
(2) batch acidifying.Anaerobic fermentation process needs inoculum, and the present invention's inoculum used is the discharging of semi continuous methane phase, and its dry substance concentration is 55%.The methanation discharging of 700mL is added in pretreated maize straw (52g TS), add tap water again to 80% of reaction vessel cumulative volume, after Homogeneous phase mixing, be filled with nitrogen, then rubber stopper seal is used, and indigo plant is covered bottle and be fixed in shaking table, shaking table homo(io)thermism is between 40 ± 2 DEG C.Timing every day pH meter measures pH, when pH lower than 5.5 time, stopping acidification.
(3) semi continuous methanation starts.Utilize CSTR reactor as anaerobic reaction device, reaction volume 8L.First in reactor, add 120g TS anaerobic sludge, then add pretreated maize straw 520g TS, then add tap water to 80% of reaction unit cumulative volume, be filled with nitrogen, temperature of reactor is set between 35 ± 2 DEG C.In contrast with untreated maize straw simultaneously.When pH reaches 7 in question response device, show that methanation has started.
(4) semi continuous methanation runs.After to be pre-treated group of methane phase has started mutually with untreated fish group methane, using the discharging of pretreated group batch acidifying as the raw material of the methane phase of pretreated group, simultaneously using the discharging of untreated fish group batch acidifying as the raw material of the methane phase of untreated fish group.Every morning 8 chargings, discharging once, are 200mL, and HRT is 40 days.Timing every day measures and records methane content and daily output tolerance, Simultaneously test discharging TS concentration.
Above-described embodiment effect is: at the end of semi continuous anaerobic reaction, and compared with non-pretreated group, the volume yield rate of pretreated group improves 80%, reaches 0.81; Methane content improves 40%, reaches 63%; Maize straw TS clearance improves 71%, reaches 70%.
Embodiment 3:
(1) stalk pre-treatment.The present invention selects through natural air drying and the maize straw do not gone mouldy, and is crushed to below 20 orders, takes a certain amount of maize straw with crucible with pulverizer, is placed in 105 DEG C of baking ovens, measures maize straw TS after 12 hours.Utilize blue lid bottle (1L) as anaerobic reaction container, reaction volume 0.8L, according to maize straw load 65g TS/L, first take 52g TS maize straw.Pretreating reagent of the present invention is water (tap water), and its addition is six times (312mL) of maize straw dry weight.Homogeneous phase mixing is placed on sealing in 40 ± 2 DEG C of environment and preserves, and pretreatment time is 1 day.
(2) batch acidifying.Anaerobic fermentation process needs inoculum, and the present invention's inoculum used is the discharging of semi continuous methane phase, and its dry substance concentration is 55%.The methanation discharging of 500mL is added in pretreated maize straw (52g TS), add tap water again to 80% of reaction vessel cumulative volume, after Homogeneous phase mixing, be filled with nitrogen, then rubber stopper seal is used, and indigo plant is covered bottle and be fixed in shaking table, shaking table homo(io)thermism is between 40 ± 2 DEG C.Timing every day pH meter measures pH, when pH lower than 5.5 time, stopping acidification.
(3) semi continuous methanation starts.Utilize CSTR reactor as anaerobic reaction device, reaction volume 8L.First in reactor, add 120g TS anaerobic sludge, then add pretreated maize straw 520g TS, then add tap water to 80% of reaction unit cumulative volume, be filled with nitrogen, temperature of reactor is set between 35 ± 2 DEG C.In contrast with untreated maize straw simultaneously.When pH reaches 7 in question response device, show that methanation has started.
(4) semi continuous methanation runs.After to be pre-treated group of methane phase has started mutually with untreated fish group methane, using the discharging of pretreated group batch acidifying as the raw material of the methane phase of pretreated group, simultaneously using the discharging of untreated fish group batch acidifying as the raw material of the methane phase of untreated fish group.Every morning 8 chargings, discharging once, are 200mL, and HRT is 40 days.Timing every day measures and records methane content and daily output tolerance, Simultaneously test discharging TS concentration.
Above-described embodiment effect is: at the end of semi continuous anaerobic reaction, and compared with non-pretreated group, the volume yield rate of pretreated group improves 71%, reaches 0.77; Methane content improves 59%, reaches 61%; Maize straw TS clearance improves 59%, reaches 65%.
Claims (1)
1. methanation discharge acidification pre-treatment maize straw improves the method for anaerobic digestion gas production performance, it is characterized in that:
Select through natural air drying and the maize straw do not gone mouldy, be crushed to below 20 orders with pulverizer, pretreating reagent is water, and its addition is six times of maize straw dry weight; Homogeneous phase mixing is placed on sealing in 40 ± 2 DEG C of environment and preserves, and pretreatment time is 1 day;
Acidifying after pre-treatment, acidifying needs inoculum, and inoculum is the discharging of semi continuous methane phase, and its dry biomass percentage concentration is 55%; To pretreated maize straw relative to the semi continuous methane phase discharging adding 100mL-700mL in 52g TS, add tap water again to 80% of reaction vessel cumulative volume, after Homogeneous phase mixing, be filled with nitrogen, then rubber stopper seal is used, and indigo plant is covered bottle and be fixed in shaking table, shaking table homo(io)thermism is between 40 ± 2 DEG C; Timing every day pH meter measures pH, when pH lower than 5.5 time, stopping acidification;
Semi continuous methanation starts; Utilize CSTR reactor as anaerobic reaction device, reaction volume 8L; First in reactor, add 120g TS anaerobic sludge, then add pretreated maize straw 520g TS, then add tap water to 80% of reaction unit cumulative volume, be filled with nitrogen, temperature of reactor is set between 35 ± 2 DEG C; In contrast with untreated maize straw simultaneously; When in question response device, pH reaches 7, semi continuous shows that methanation has started;
After semi continuous methanation has started, using the discharging of acidifying as raw material, once, charging is equal with discharging volume, and HRT is 40 days, and described discharging is referred to as the discharging of semi continuous methane phase for timing charging every day, discharging.
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Application publication date: 20150429 |