130 results about "Methane yield" patented technology

The invention belongs to the technical field of waste resource utilization, and provides a method for enhancing anaerobic digestion to produce methane. The invention provides a research and development concept of dynamically regulating and controlling nano bubble water injection in stages. The core breakthrough points of the research and development concept comprise: 1) time sequence optimization; based on the pH value of an anaerobic digestion system, H2-NBW or O2-NBW is injected in stages, and the anaerobic digestion hydrolytic acidification stage and the methane production stage are regulated in a targeted manner. O2-NBW is injected in the hydrolytic acidification stage to promote decomposition of protein and cellulose in a substrate, H2-NBW enriched hydrogen nutrition type methanogenesis is switched in the methanogenesis stage, and a hydrogen nutrition type methanogenesis way is enhanced. And (2) when the pH is more than or equal to 6.5 and less than or equal to 7.5 in a neutral safe region, dynamically adjusting the gas type of the nano bubble water by combining the ORP of the anaerobic digestion system, thereby realizing the accurate gradient control of the oxidation reduction potential and improving the methane yield.

The invention provides a method for efficiently producing methane by utilizing an iron-carbon composite material and a microbial electrochemical coupling anaerobic digestion system, and belongs to the technical field of microbial electrochemical environment-friendly treatment processes. The Fe-C material is successfully loaded on the anaerobic granular sludge through a special treatment mode by constructing the Fe-C material, so that the Fe-C material forms a micro-electrolysis system in a reaction system, the contact area of microorganisms and electrodes is enlarged, efficient electron transfer among the microorganisms is enhanced, and the methane production performance and the system stability of a microbial electrochemical system (MEC) are improved. Compared with a traditional MEC-AD system, the system provided by the invention can greatly improve the accumulated methane yield and the direct interspecific electron transfer (DIET) methane yield.

The invention discloses methanogen lyase homologous with high-dimensional characteristics of PeiR lyase and application of the methanogen lyase and aims to solve the problems that PeiR lyase protein of methanogen cell wall peptide bonds can participate in the biological process of hydrolyzing archaea cell walls, methanogen is effectively killed, methane production is reduced, and protein homologous with the protein has potential methane reduction potential. According to the invention, a series of biological information software is utilized to identify protein sequences coded by methanogen viruses from a large amount of rumen microbiome sequencing data, and high-dimensional homology between the proteins and PeiR proteins based on a deep learning model TM-Vec is further analyzed, so that a series of methanogen lyases are obtained. In order to realize the expression of the lyase, multiple segments of primers are designed to synthesize a target sequence, and the target sequence is successfully expressed in a prokaryotic expression system. Through the detection of crude enzyme liquid, the effectiveness of the lyase in the aspect of reducing the methane yield is verified in an in-vitro gas production test.

The invention belongs to the technical field of biomass anaerobic treatment, and particularly discloses a method for preparing methane through biomass anaerobic digestion based on oxygen nano bubble water. Biomass, activated sludge, oxygen nano bubble water and water are mixed, anaerobic digestion treatment is carried out, and methane is obtained. By introducing high-stability oxygen nano bubble water, a suitable micro-aerobic environment is provided for facultative anaerobic bacteria, so that the metabolic activity of the facultative anaerobic bacteria is activated, the decomposition and conversion of complex organic matters are accelerated, and the efficiency of a hydrolytic acidification stage is remarkably improved. Compared with a traditional chemical or physical pretreatment mode, the method has the advantages that interference on anaerobic flora is avoided, the degradability of a substrate is effectively enhanced, and more sufficient organic acid is provided for a subsequent methane production stage, so that the yield of methane is increased.

The invention discloses a pretreatment method for increasing the yield of anaerobic fermentation methane of a lignocellulose material, and belongs to the technical field of high-efficiency anaerobic fermentation methane production of organic solid waste. The method comprises the following steps: (1) crushing straws; (2) mixing the straw powder and deionized water according to a mass ratio of 1: (19-21), stirring at a rotating speed of 120-180r / min, treating for 22-26h, fully and uniformly mixing, adjusting the pH value of the system to 3.4-3.7, adding 0.08-0.12 wt% of cellulase according to the mass of the straw, and carrying out enzymolysis at 49-51 DEG C for 2-4d to obtain an enzymatic hydrolysate; (3) yeast pre-fermentation: inoculating 4-6% v / v activated angel high-activity dry yeast into the enzymatic hydrolysate in the step (2) for anaerobic pre-fermentation, wherein the pre-fermentation time is 16-20 hours; and (4) anaerobic fermentation for methane production: adding 20-30% v / v of introduction sludge into the fermentation system in the step (3), and carrying out anaerobic fermentation for methane production, wherein the fermentation temperature is 36-38 DEG C. Compared with the prior art, the method has the advantages of being high in adaptability, short in treatment period, good in economic benefit, free of environmental pollution and the like, and has certain guidance and inspiration effects on engineering of producing methane from straw.

The invention discloses a method for enhancing digestion sludge dewatering by recycling a flocculating agent, and relates to the technical field of municipal sludge treatment. The method comprises the following steps: identifying and utilizing a recyclable flocculant PAC in the residual sludge, adding CaO2 into the residual sludge containing PAC, uniformly mixing, and adjusting the pH value; feeding the treated residual sludge into an anaerobic digestion reactor, and monitoring the methane yield and the daily gas yield until the gas is exhausted, namely completing anaerobic digestion; and carrying out dehydration treatment on the digested sludge obtained after anaerobic digestion is completed so as to realize enhanced dehydration of the digested sludge. The water content of the digested sludge can be reduced, and the dehydration efficiency and the resource recycling rate of the digested sludge are effectively improved; and the polyaluminum chloride is used as a recycling flocculant to effectively crush the digested sludge particles, so that effective discharge of moisture among the digested sludge particles can be ensured, the flowability and compressibility of the digested sludge can be optimized, and subsequent transportation and treatment are facilitated.

The invention provides a method for increasing anaerobic digestion productivity of waste and relieving acid inhibition by adopting nano bubble water. The method comprises the following steps: preparing hydrogen-nano bubble water, preparing inoculation mud, mixing the hydrogen-nano bubble water, the inoculation mud and agricultural wastes, and carrying out anaerobic digestion treatment; according to the method, in the anaerobic digestion process, the hydrolysis rate can be increased, the hysteresis period can be shortened, the methane yield can be increased, ammonia / acid inhibition can be effectively relieved, the consumption speed of volatile fatty acid is increased by 35% or above, and trans-fatty acid inhibition can be effectively relieved. And an innovative solution thought is provided for relieving the inhibition phenomenon generally occurring in the AD process.

The invention discloses a sewage pipeline BOD biological action degradation amount detection method and system based on an SWMM model. The method comprises the following steps that a sewage pipe network model of a to-be-detected area is established in the SWMM model; arranging a plurality of monitoring points in an inspection well of the sewage pipeline in the to-be-detected area, and acquiring flow data, flow velocity data and liquid level data of the plurality of monitoring points; the flow data and the liquid level data are input into the sewage pipe network model, and the average wetted perimeter area of each pipe section in the monitoring time period is obtained; at least one pipe section is selected, and the methane yield and the hydrogen sulfide yield of the pipe section are obtained based on the average wetted perimeter area of the pipe section; and calculating the BOD biological action degradation amount of the sewage pipeline based on the methane yield, the hydrogen sulfide yield and the average wetted perimeter area of each pipe section. The method solves the problem that a current calculation method for the BOD biological action degradation amount of the sewage pipeline is not accurate.

The invention discloses a magnetic biochar coupled dynamic membrane synergistic pollution reduction and flora regulation method, which comprises the following steps: adding magnetic biochar into an anaerobic dynamic membrane bioreactor for anaerobic digestion reaction, and adding 1.2-1.5 g of magnetic biochar into each liter of sludge mixed liquid in the anaerobic dynamic membrane bioreactor. The magnetic biochar is composed of a honeycomb-shaped carbon material obtained by pyrolyzing carbon through sodium citrate and Fe3O4 loaded on the surface of the honeycomb-shaped carbon material through a chemical coprecipitation method. According to the method, functional microorganisms such as methane filamentous bacteria and methane rod bacteria can be selectively enriched, the methane yield is increased by 30%-35%, membrane pollution is effectively relieved by improving the sludge floc structure, the service life of the membrane is prolonged, and technical support is provided for low-cost and low-energy-consumption operation of the anaerobic membrane bioreactor.

A method for predicting CH4 production and CO2 sequestration in a CO2-ECBM process belongs to the field of natural hydrogen resource exploration, and is technically characterized by comprising the following steps: constructing a multiphase and multicomponent coupling model for describing the migration process of water, methane and carbon dioxide of a stratum coal bed gas reservoir; the method comprises the following steps: constructing a geologic model of a stratum coalbed methane reservoir, performing grid division on the geologic model to obtain a plurality of grid units reflecting different spatial distribution positions of the coalbed methane reservoir, and setting initial conditions and boundary conditions of the geologic model; and according to the multiphase and multicomponent coupling model, solving spatio-temporal evolution characteristics of pressure and concentration of water, methane and carbon dioxide of each grid unit of the geologic model to obtain distribution in time and space. According to the method, the influence of the underground water in the coal bed gas on the migration behavior of methane and carbon dioxide is fully considered, the limitation of prediction result deviation caused by neglecting the effect of the underground water in the existing research is overcome, and the accurate prediction of the methane yield and the carbon sequestration amount in the CO2-ECBM process is realized.

The invention relates to the technical field of catalysts, in particular to a methanation catalyst and a preparation method thereof.The methanation catalyst comprises a carrier and an active component loaded on the carrier; the carrier is prepared from one or more of Al2O3, Fe2O3, MgO, CaO and K2O; the active component at least comprises Ni; the catalyst is of a sheet structure. The catalyst with the sheet structure can realize methanation of CO and / or CO2 under normal pressure, has the capability of rapidly amplifying production, and is convenient for production and application; the catalyst has high stability and long service life; the catalyst is high in CO and / or CO2 conversion rate, high in methane yield and continuous and stable in gas output; the catalyst is high in water resistance and can work in a harsh environment; in addition, the preparation process is simple, the reproducibility is good, the cost is low, a new thought is provided for carbon sequestration and clean fuel synthesis, and industrial large-scale popularization and application are facilitated.

The invention discloses a humic acid capacitor for stimulating microbial electrical metabolism and application of the humic acid capacitor in anaerobic digestion, and belongs to the field of biological metabolism and transformation application. The electron storage capacity of humic acid is improved through micro-current catalysis, so that the humic acid becomes a biological capacitor capable of promoting microbial electrical metabolism. The biological capacitor can be used for adjusting unbalanced metabolism between acid-producing bacteria and methanogens in the sludge anaerobic digestion process, the electron utilization rate in a biological metabolism and conversion system is improved, and the methane production performance of sludge anaerobic digestion is greatly improved; the humic acid capacitor can increase the daily methane yield in the sludge anaerobic digestion process by 80-100%. According to the method, the biological capacitor with excellent performance can be obtained only by applying the micro current, and the method is green, environment-friendly, low in cost and high in efficiency, is a new method and idea for improving the anaerobic digestion performance of the sludge, can be popularized to the fields of development and utilization of new energy such as other biological metabolism and conversion and solar energy, and has huge application value.

The invention discloses a regulation and control system for anaerobic digestion and a magnetic charcoal preparation method thereof, which effectively achieve the purposes of increasing methane yield and reducing system energy consumption, and comprises: an anaerobic fermentation unit, which is provided with an aeration device and a heat exchanger; the micro-nano bubble generation unit is connected with the aeration device through a pipeline and comprises a switchable gas source for providing at least one of H2, N2 and CO2; the bubble generation assembly adopts a composite structure of a microporous membrane and a Venturi tube; the magnetic charcoal adding unit is connected with the anaerobic fermentation unit through a sealing pipeline and comprises a storage tank and a screw feeder; the intelligent control unit comprises a sensor array and an executing mechanism, the structure is novel, the conception is ingenious, operation is easy and convenient, the effects of accurately controlling the particle size of bubbles and maintaining the interface potential are effectively achieved, and the effect of intelligently switching gas components and the charcoal adding amount is achieved.

The invention relates to a recombinant engineering bacterium for expressing pure iron nitrogenase as well as a construction method and application of the recombinant engineering bacterium, and belongs to the field of biotechnology and bioengineering. Key gene clusters of rhodopseudomonas and Vilnelande nitrogen-fixing bacteria are amplified and cloned into an expression vector, escherichia coli is converted to obtain recombinant engineering bacteria for expressing pure iron nitrogenase, and the pure iron nitrogenase expressed by the recombinant engineering bacteria can reduce carbon dioxide (CO2) into methane (CH4); the recombinant engineering bacteria are cultured in an LB culture medium added with ferric chloride, ampicillin and spectinomycin, oxygen exposure is reduced as much as possible under the optimized semi-anaerobic condition, the enzyme activity can be improved to the maximum extent, and compared with a traditional system, the methane yield is remarkably increased; by providing a novel methane production scheme, the technical defects of low efficiency and oxygen sensitivity of the traditional nitrogenase process are improved; the process of the present invention contributes to carbon capture and utilization by converting waste carbon dioxide into valuable methane.

The invention belongs to the technical field of CO2 catalytic conversion, and discloses an in-situ reduction efficient CO2 methanation catalyst as well as a preparation method and application thereof. The efficient CO2 methanation catalyst NiA (CO3) xRe is formed by in-situ reduction of Ni and A coupled carbonate NiA (CO3) x, wherein A is selected from one of Mg, Ce and Al. NiA (CO3) xRe is prepared by a coprecipitation method. According to the present invention, the reaction equilibrium conversion is achieved at 300 DEG C in the reaction atmosphere with the CO2: H2: N2 volume ratio of 1: 4: 5 and the air speed of 150000 mL.gcat <-1 >. H <-1 >, the methane selectivity reaches 100%, the methane yield reaches 677.8 mmol.gcat <-1 >. H <-1 >, and the methane selectivity is still not reduced after the operation is performed for 100 h under the condition; compared with the prior art, the prepared catalyst greatly improves the high efficiency and stability of methanation catalytic reaction, the preparation process is simple, large-scale production is easy to achieve, the catalyst is matched with the temperature of coal-fired flue gas, energy does not need to be input again, efficient conversion can be completed, carbon emission is effectively reduced, and high-value products are obtained for use; and a favorable way is provided for realizing a carbon neutralization target.

The invention discloses a CSTR-based three-dimensional electrode MEC-fluidized bed reactor for anaerobic fermentation of cow dung and application, and belongs to the technical field of microbial electrochemistry. The reactor comprises a reactor main body, a feed port, a discharge port, a gas outlet and a stirring device, an anode and a cathode are arranged in the reactor main body, a conductive three-dimensional particle electrode filler is filled between the anode and the cathode to form a three-dimensional electrode system, and the anode and the cathode are connected with an external power supply. The three-dimensional electrode system is constructed, so that the reaction specific surface area and the electron transfer efficiency are greatly increased, the stimulation effect of a low-voltage electric field is amplified to the whole reaction space, and the technical bottlenecks of low mass transfer efficiency, low methane yield, easiness in system instability and the like in the traditional cow dung anaerobic digestion are solved. Compared with the traditional anaerobic digestion and two-dimensional microbial electrolysis cell, the two-dimensional microbial electrolysis cell disclosed by the invention can obviously improve the methane yield and the system operation stability, and has an excellent engineering application prospect.

The invention relates to a novel methanogen inhibitor for ruminants. The invention also extends to the use of such compounds in ruminants to reduce methane production in the rumen and / or to increase productivity in ruminants.

This invention discloses an anaerobic bio-fermentation process for the targeted degradation of municipal sewage sludge, belonging to the field of sludge treatment technology. The process includes: pretreatment and targeted activation of components; staged hydrolysis and acidification for targeted production of short-chain fatty acids; methanogenic fermentation mediated by conductive materials coupled with a microbial electrolysis cell for assistance; multi-parameter dynamic control based on online monitoring and intelligent algorithms; magnetic separation, recovery, and recycling of magnetic conductive materials; in-situ biogas purification and product gradient reflux; solid-liquid separation and residue resource utilization. This invention achieves kinetic matching and metabolic enhancement of hydrolysis and acidification and methanogenesis through the deep linkage of four modules: targeted hydrolysis and acidification, enhanced direct interspecies electron transfer via a microbial electrolysis cell, magnetic material circulation, and intelligent control. Compared with existing technologies, the methane yield is increased by more than 40%, propionic acid accumulation is below 50 mg / L, the fermentation cycle is shortened to 8-10 days, and system energy consumption is reduced by 20%.

The invention discloses a preparation method and application of an electrode of bioelectrochemical equipment. The method comprises the following steps: S1, pretreatment; s2, preparing a polyvinyl alcohol solution; s3, preparing electrode slurry; s4, coating is carried out; and S5, drying. The electrode is used for treating chlorophenol wastewater. The electrode provided by the invention is prepared by modifying zero-valent iron, is arranged in an anode region of a bioelectrochemical reactor, and can effectively regulate and control oxidation-reduction potential, strengthen electron transfer between iron reducing bacteria and acetogenic bacteria at an anode and enrich acetogenic flora by loading trace zero-valent iron, so that the yield of acetic acid in an acidogenic phase is increased; the synchronous pollutant removal and methane yield increase are realized, and the economic benefit is improved.

The invention belongs to the technical field of organic waste treatment, and particularly relates to a multi-parameter regulation and control high-cellulose organic waste anaerobic digestion treatment method. According to the method provided by the invention, high-cellulose wastes such as traditional Chinese medicine residues, olive residues and vinasse are subjected to alkali liquor, hydrothermal or biogas slurry pretreatment, the contents of reducing sugar, volatile fatty acid (mainly acetic acid) and ammonia nitrogen are synchronously monitored, and the pretreatment conditions are dynamically adjusted according to preset thresholds (the reducing sugar is less than or equal to 50mg / g, the acetic acid is obviously higher than propionic acid, and the ammonia nitrogen is less than or equal to 7mg / g). The method disclosed by the invention realizes cooperative regulation and control of hydrolysis promotion and digestion stability, effectively avoids acidification and ammonia inhibition, improves the methane yield and the system operation stability, and is suitable for efficient anaerobic digestion treatment of various high-cellulose organic wastes.

The invention belongs to the technical field of yield increase of methane gas by anaerobic degradation of lignite, and provides a method for producing methane gas by anaerobic degradation of lignite by mixing exogenous bacteria and straws. According to the method, temple river coal seam water enrichment culture flora is used as exogenous bacteria, Inner Mongolia Shengli lignite is used as a gas production substrate, the same culture medium and bacterial liquid are added, and the influence of coal, straw and addition of the coal and the straw on the methane gas production rate is analyzed. After two months of monitoring, the net methane yield of a straw and coal (1: 1) group is 84.28 mL, and the net methane yield is 28.09 mL / g; the net methane yield of a coal group is 33.15 mL, and the net methane yield is 11.05 mL / g; the gas production rate of the straw and the coal as the substrate is more than two times that of the single coal as the substrate. According to data calculation of bottled experiments, the daily gas production rate of the exogenous bacteria for degrading the coal and the straws is 0.47 m < 3 > / t / d. The exogenous bacteria and the straws jointly act on the lignite, so that the gas volume and the gas production rate are obviously increased. And the generated methane can also be used as a green energy source in other fields.

The invention provides a method for preparing methane through pyrolysis of medical waste and application of the method, and relates to the technical field of medical waste treatment and energy recovery, and the method comprises the following steps: pyrolyzing the medical waste to obtain pyrolysis gas, purifying the pyrolysis gas, then carrying out steam reforming reaction to obtain reacted gas, separating and purifying the reacted gas to obtain the methane. Methane is obtained; during pyrolysis, the temperature is increased to 190 DEG C to 210 DEG C and kept for 8 min to 12 min, then the temperature is increased to 390 DEG C to 410 DEG C and kept for 13 min to 17 min, and then the temperature is increased to 540 DEG C to 560 DEG C and kept for 30 min to 40 min; the steam reforming reaction catalyst is a lanthanum modified nickel-based catalyst. According to the method, the technical effects of destroying pathogens in the medical wastes, cracking macromolecular organic matters, improving the methane yield and purity and reducing the treatment cost are achieved, and harmless, resourceful and efficient treatment of the medical wastes is realized.

The present invention provides a method for producing methane by dry anaerobic fermentation, which relates to the technical field of anaerobic fermentation. In the present invention, a biochar-immobilized complex enzyme is added during the dry anaerobic fermentation process. The biochar-immobilized complex enzyme is achieved by fixing the enzyme to biochar, which can enhance the stability and resistance to protein degradation of the enzyme, extend the service life of the enzyme, and reduce the inactivation rate of the enzyme, thereby facilitating an increase in methane production. In addition, biochar has a high specific surface area and the characteristics of promoting interspecies electron transfer, which is conducive to increasing methane production. Moreover, in the biochar-immobilized complex enzyme, biochar fixes the enzyme on its surface or interior, which can provide more reactive sites, which is conducive to the enrichment of methanogens, thereby shortening the fermentation reaction cycle and facilitating an increase in the reaction rate of anaerobic fermentation. In summary, the reaction rate and methane yield of the method for producing methane by dry anaerobic fermentation provided by the present invention are both high.

The invention discloses a method for promoting anaerobic digestion of sludge to produce methane through combination of straw bacterial saccharification products and sludge pretreatment, and belongs to the field of preparation of methane from waste biomass by microorganisms. The invention aims to solve the problems of low hydrolysis rate and low methane yield in the conventional process for producing methane by anaerobic digestion of sludge. The method comprises the following steps: 1, taking crushed corn straws as a saccharification substrate, and inoculating R.thermocell M3 to prepare a saccharification product; 2, adjusting the pH value of the residual sludge in the secondary sedimentation tank to 9; and 3, carrying out anaerobic digestion on the microbial saccharification product and sludge to produce methane. In the anaerobic digestion system, the methane production process of the sludge is enhanced by pretreating the sludge and adding the microbial saccharification product containing the high-carbon compound, so that the methane yield is increased.

The invention relates to the technical field of biological fermentation engineering, and discloses a method for preparing clean biological methane gas from duckweed residues, which comprises the following steps: fermenting anaerobic granular sludge as an inoculant and duckweed residues as a fermentation substrate in an anaerobic fermentation tank to prepare methane; the anaerobic fermentation tank comprises a tank body, a cover body and a regulation and control unit, wherein the regulation and control unit comprises a controller, a display screen, a barrel, a telescopic device for driving the barrel to lift, and a pH sensor, a conductivity sensor and an acid and alkali liquor adding pipe which are fixed in the barrel; the liquid inlet end of the acid and alkali liquid adding pipe is communicated with an acid liquid pipe, an alkali liquid pipe and a flushing liquid pipe through a four-way valve; the telescopic device, the pH sensor, the conductivity sensor, the four-way valve and the display screen are all electrically connected with the controller. According to the scheme, the regulation and control unit is additionally arranged, so that the pH of the fermentation liquor is effectively and accurately regulated and controlled in real time, the pH of the fermentation liquor is ensured to be within the optimal active pH range of methanogens, the activity of the methanogens and the methane yield are further improved, and the production benefits are improved.

The invention discloses a method for predicting catalytic cracking gas components, and belongs to the technical field of catalytic cracking product prediction. The method comprises the following steps: calculating the hydrogen content of the raw oil in combination with the refractive index, density, relative molecular mass, sulfur content and viscosity of the raw oil; calculating the carbon content in combination with the hydrogen content, sulfur content and nitrogen content of the raw oil; calculating the yields of methane, ethane, ethylene, propane, propylene, n-butane, isobutane and butene in combination with the structural group composition, gas yield, gasoline yield, coke yield and reaction temperature of the raw oil; calculating the hydrogen yield in combination with the methane yield and the metal content of the raw oil; calculating the hydrogen sulfide yield in combination with the sulfur content and conversion rate of the raw material. The method provides a method for predicting gas composition according to conventional properties of raw materials, such as density, viscosity, residual carbon, sulfur content and distillation range, and main operating conditions, such as reaction temperature, which has a high accuracy rate and is of great significance to the optimization design of catalytic cracking units.

The invention relates to a preparation method and application of a compound flocculant for municipal sewage treatment, and aims to solve the problems of high operation cost and the like caused by insufficient energy self-supply capability and dependence on coagulant addition in chemical strengthening primary treatment in the existing sewage treatment system. The preparation method comprises: 1, preparing a ferric chloride solution; 2, adding chitosan quaternary ammonium salt into an acidic buffer solvent to obtain a chitosan quaternary ammonium salt solution; and 3, adding the ferric chloride solution into the chitosan quaternary ammonium salt solution, stirring, and standing to obtain a stable compound flocculant solution. The prepared compound flocculating agent can efficiently intercept organic matters and phosphorus in sewage, the dosage of chemicals is remarkably reduced, the operation cost is reduced, and meanwhile, the problem of acidic sludge caused by the use of aluminum salt is avoided; the iron-reinforced sludge obtained by the invention shows higher degradability and methane gas production efficiency in the anaerobic digestion process, and the methane yield is 98.92 mL / gVSS.

The invention discloses a spiral symmetrical flow anaerobic membrane bio-membrane reactor system, which comprises a spiral symmetrical flow anaerobic reactor and a membrane aeration bio-membrane reactor, the spiral symmetrical flow anaerobic reactor is sequentially provided with a water inlet pump, a water inlet pipe, a first anaerobic reaction zone, a second anaerobic reaction zone, a third anaerobic reaction zone, a main gas outlet pipe and a water outlet pipe from bottom to top; the membrane aeration bio-membrane reactor is sequentially provided with a water inlet pump, a water inlet pipe, an MABR third reaction zone, an MABR second reaction zone, an MABR first reaction zone, a membrane assembly, an air inlet assembly and a water outlet pipe from bottom to top. According to the invention, gas-liquid interaction among multiple reaction intervals is realized through the gas pump and the liquid pump, precise regulation and control of gas partial pressure and reflux flow are realized, and the system has the characteristics of enhancing mass transfer driving force, improving methane yield, optimizing denitrification efficiency and the like, so that the system can adopt a green and low-carbon water treatment route, and meanwhile, efficient and intensive reactor combination is realized.

The application discloses an anaerobic bacteria agent and method for improving the anaerobic methane production rate of medium-temperature and medium-high-temperature cellulose. The compound anaerobic microbial liquid bacteria agent is prepared from Ruminiclostridium cellobioparum subsp. termitidis, Thermoanaerobacter ethanolicus, Clostridium sartagoforme and Methanosarcina barkeri. The bacteria agent is composed of four strains of synergistic bacteria, and the culture process is simple and easy to operate. When the bacteria agent is applied to medium-temperature and medium-high-temperature anaerobic digestion, the cellulose conversion methane rate can be significantly improved (more than 40%) and the methane yield can be significantly improved (more than 120%).

The present invention provides a new process and facility to remove carbon dioxide from a methane and carbon dioxide containing gas stream. The new process is particular suitable to expand capacities of carbon dioxide removal plants using amine absorption technology. In addition, it allows to reduce methane emission and to increase methane yields significantly.