130 results about "Methane fermentation" patented technology

The invention provides a method for resourceful treatment of blue-green algae and reed straws, which comprises the following steps: (1) mixing dehydrated blue-green algae, crushed reed straws and water to obtain a mixture to be fermented; (2) introducing the to-be-fermented mixed material into an acidification hydrolysis fermentation tank, adding a first bacterial liquid, introducing protective gas, and carrying out acidification hydrolysis fermentation in a closed environment to obtain a fermented mixed material; (3) when the pH value and the acetic acid volume content of the fermented mixture reach target values, releasing the closed environment, and performing solid-liquid separation to obtain biogas slurry and biogas residues; (4) introducing the biogas slurry into an anaerobic methanogenesis fermentation tank, adding a second bacterial liquid, introducing protective gas for anaerobic methanogenesis fermentation, and collecting produced methane gas; and (5) introducing the biogas residue into an aerobic fermentation tank, adding an aerobic fermentation bacterial liquid, carrying out aerobic fermentation, and collecting the produced finished product organic fertilizer. According to the method provided by the invention, efficient reutilization of the blue-green algae and the reed straws is realized, the treatment efficiency and the gas production rate are improved, and large-scale popularization and application are facilitated.

To provide a biomethane production method and a biomethane production apparatus by which an amount of biomethane to be obtained can be increased, and operation can be performed stably.SOLUTION: A biomethane production method includes a methane fermentation process of processing organic waste 1 containing hardly decomposable solid matters in a methane fermentation tank 11 where methane bacteria exist. In the methane fermentation process, when supplying at least one of organic acid 2 and biodegradable resin and hydrogen 3 into the methane fermentation tank 11, a ratio of a supply amount of the hydrogen 3 to a supply amount of the organic acid 2 and the biodegradable resin is set to 0.10 L / gCOD or more and 1.50 L / gCOD or less such that pH inside the methane fermentation tank 11 becomes 7.0 or more and 9.0 or less.SELECTED DRAWING: Figure 1

System and process are provided for fixation of carbon dioxide through fermentation. More specifically, the disclosure includes fermenting carbon dioxide into methane through methanogenic archaea and producing single cell protein nutrient supplement. The disclosure further provides the integration of methanogenic fermentation with additional processes to achieve improved carbon efficiency.

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.

To collect biogas subjected to highly efficient methane fermentation by using a waste raw material increased in calorie by pre-treatment; and to efficiently and effectively utilize a post-processing residue after collecting the biogas by post-treatment.SOLUTION: A biogas plant is provided with a semi-carbonized pellet forming system comprising: a drying treatment residue recovery device; a hydrothermal reaction treatment device that receives the drying treatment residue from the drying treatment residue recovery device and subjects the drying treatment residue to hydrothermal reaction treatment to form a semi-carbonized powder product in a powder form by semi-carbonization; a semi-carbonized powder product recovery device that recovers the formed semi-carbonized powder product; and a semi-carbonized pellet forming device that forms semi-carbonized pellets from the semi-carbonized powder product.SELECTED DRAWING: Figure 1

To develop manufacturing of methane gas having high concentration with reduced energy.SOLUTION: Gas purification is enabled by pressurizing and supplying a mixture of raw refuse, excreta, and sewage sludge to a methane fermentation tank by a feed water pump, and using a pressure of gas generated after fermentation.SELECTED DRAWING: Figure 1

To provide a dry methane fermentation tank which has a simple constitution, is easily maintained, and can sufficiently ferment a material to be fermented, a dry methane fermentation system equipped with the dry methane fermentation tank, and a dry methane fermentation method.SOLUTION: A dry methane fermentation tank comprising: a fermenter body for storing an organic resource and / or a raw material derived from the organic resource in a storage space and performing dry methane fermentation; an inlet port which is provided in the fermenter body and through which the organic resource and / or the raw material derived from the organic resource is charged into the fermenter body; The dry methane fermentation tank has a discharge port for discharging the fermentation residue of the organic resources and / or the organic resource-derived raw material from the dry methane fermentation tank body, and a conveyor device for carrying the organic resources and / or the organic resource-derived raw material charged from the charge port and transferring the organic resources toward the discharge port side.SELECTED DRAWING: Figure 2

The invention provides a segmented anaerobic-aerobic combined reaction device system and application thereof. The device system comprises an acidification hydrolysis fermentation unit, a solid-liquid separation unit, an anaerobic methanogenesis fermentation unit and an aerobic fermentation unit, wherein the acidification hydrolysis fermentation unit, the solid-liquid separation unit and the anaerobic methanogenesis fermentation unit are sequentially connected through pipelines; the aerobic fermentation unit is connected to a slag outlet of the solid-liquid separation unit through a conveying belt. The device system provided by the invention has the functions of anaerobic fermentation and aerobic fermentation, is particularly suitable for resourceful treatment of blue-green algae and reed straws, and performs resourceful treatment of the blue-green algae straws by combining the physicochemical properties of the blue-green algae and reed straws, the characteristic of methane production by anaerobic fermentation and the advantage of aerobic fermentation after dehydration of biogas residues; the efficient reutilization of blue-green algae and reed straws is realized, the treatment efficiency and the gas production rate are improved, and the stable operation of the system is ensured.

An anaerobic treatment method that can efficiently utilize harvest residues produced in agricultural fields as resources. The anaerobic treatment method causes a raw material including harvest residues produced in an agricultural field to undergo methane fermentation to return fermentation residues produced from the methane fermentation to the agricultural field and to utilize biogas produced from the methane fermentation as an energy source, and includes adjusting a cut length of the harvest residues to be supplied to the methane fermentation based on information about demand for the fermentation residues or the biogas. The method includes adjusting a cut length or average cut length of the harvest residues to be supplied to the methane fermentation to be short in response to an increase in demand for the fermentation residues or the biogas.

This methane fermentation treatment method involves repeating: a slow stirring step for using a methane fermentation tank that includes an inner cylinder of which the lower end part is opened and which provides on the inside of an outer cylinder of which the upper and lower end parts are closed, a lower part communication path which communicates the outer cylinder and the inner cylinder with each other at the lower part thereof and allows fermented sludge to flow, and an upper part communication path which communicates gas phase spaces formed at upper parts of the outer cylinder and the inner cylinder with each other and allows the communication state to switch between open and closed states, supplying biogas to the outer cylinder or the inner cylinder from the outside, and causing fermented sludge to flow between the outer cylinder and the inner cylinder while providing the liquid level difference between the outer cylinder and the inner cylinder; a rapid stirring step for eliminating the pressure difference in the gas phase spaces formed in the outer cylinder and the inner cylinder to remove the liquid level difference formed in the slow stirring step, and causing the fermented sludge to flow in a direction opposite to the slow stirring process; and a standing step for leaving the fermented sludge alone after the rapid stirring step or the slow stirring step.

The object of the present invention is to provide a biogas treatment facility and a biogas treatment method that enable the removal of carbon dioxide contained in biogas generated by methane fermentation in a simple and low-cost manner. [Solution] To solve the above problems, we provide a biogas treatment facility and a biogas treatment method that include a gas-liquid contact section for bringing biogas discharged from a methane fermentation facility into contact with an aqueous solution containing alkaline earth metal ions, wherein a carbonate precipitation reaction proceeds in the gas-liquid contact section. [Effect] According to this invention, for biogas generated by methane fermentation and having a relatively high carbon dioxide content, carbon dioxide can be removed (recovered and fixed) from the biogas by a carbonate precipitation reaction that proceeds without the supply of external energy. This makes it possible to remove carbon dioxide contained in biogas simply and at low cost.

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%.

To provide an organic waste treatment method and organic waste treatment system that can stably and inexpensively perform methane fermentation of organic waste. [Solution] The organic waste treatment method according to this disclosure is an organic waste treatment method comprising methane fermentation of a mixture of chicken manure and food waste, wherein the mixture contains 5% or more of the food waste.

To provide a storage method for harvest residues that enables efficient utilization, as a resource, of harvest residues generated in fields.SOLUTION: In a storage method for harvest residues, a compression-molded body of harvest residues generated in a field is stored as a raw material for methane fermentation. The method comprises: adding water to the harvest residues before or after molding into the compression-molded body by a compression molding machine; and storing the harvest residues such that at least the inside of the compression-molded body is maintained in a moist state.SELECTED DRAWING: Figure 3

A waste treatment system is provided that can efficiently transfer a hydrothermally treated product from a hydrothermal treatment device to a mixing and adjusting tank and can effectively utilize the thermal energy contained in the hydrothermally treated product. [Solution] A hydrothermal treatment device for hydrothermal treatment of biomass contained in waste, comprising: a hydrothermal treatment device having an outlet for discharging a hydrothermal-treated biomass product; a mixing and adjustment tank including a hydrothermal-treated product receiving port for receiving the hydrothermal-treated product discharged from the outlet and configured to mix the hydrothermal-treated product received from the hydrothermal-treated product receiving port with a diluent to adjust the properties of the hydrothermal-treated product; and a methane fermentation tank configured to produce methane gas using the liquid portion of the hydrothermal-treated product discharged from the mixing and adjustment tank, wherein the outlet of the hydrothermal treatment device is located at a higher position than the hydrothermal-treated product receiving port of the mixing and adjustment tank.

To provide a complex facility having a facility of carbonization and conversion into a fuel which can use fermentation residual water in a biologically gasifying facility.SOLUTION: A complex facility includes a biologically gasifying facility 10 having a fermentation tank 12 for performing methane fermentation of an organic waste and generating biological gas and a first flow channel 15 for draining fermentation residual water used in the fermentation tank 12, and a facility 30 of carbonization and conversion into a fuel having a carbonization facility 34 for converting waste into a carbide 40 and a desalination facility 31 for desalting the carbide 40 carbonized by the carbonization facility 34 with desalination water 45, and a control device 60 for controlling the biologically gasifying facility 10 and the facility 30 of carbonization and conversion into the fuel, wherein the first flow channel 15 of the biologically gasifying facility 10 is connected to the desalination facility 31 of the facility 30 of carbonization and conversion into the fuel, and the control device 60 supplies the fermentation residual water 21 of the biologically gasifying facility 10 as the desalination water 45 to the desalination facility 31 through the first flow channel 15, when the facility 30 of carbonization and conversion into the fuel is operated.SELECTED DRAWING: Figure 1

An object of the present invention is to provide an organic waste treatment apparatus, an operation method thereof, and an organic waste treatment method capable of preventing an increase in the number of anaerobic digestion tanks and an adverse effect on a water treatment facility and recovering a large amount of resources including biogas from a sewage treatment plant even in a higher organic matter load (input of a large amount of dehydrated cake) than before by increasing the efficiency of an anaerobic digestion process.SOLUTION: The organic waste treatment apparatus of the present invention comprises an anaerobic digestion tank for producing digested sludge by methane fermentation of slurry-like organic waste with anaerobic microorganisms, a solid-liquid separation device for separating the digested sludge in the anaerobic digestion tank into concentrated sludge and separated liquid, and an electrodialysis device for separating desalted liquid by electrodialysis of the separated liquid with an ion exchange membrane, wherein the separated liquid is introduced into the anaerobic digestion tank.SELECTED DRAWING: Figure 1

An object of the present invention is to provide a system for concentrating and treating a methane fermentation digested liquid, which efficiently concentrates the liquid portion of a methane fermentation digested liquid to obtain liquid fertilizer. [Solution] The above-mentioned object is achieved by a circulation treatment system for screen permeate of methane fermentation digestive liquid, the system comprising a liquid storage means, a filtration means, and a circulation means, the liquid storage means being configured to be capable of containing the screen permeate, the filtration means being configured to filter the screen permeate in an upward flow manner, and the circulation means being configured to circulate the screen permeate between the liquid storage means and the filtration means.

The present disclosure addresses the problem of providing a woody biomass washing waste liquid saccharification method that eliminates the need for a temperature adjustment when a woody biomass washing waste liquid is saccharified and can substantially increase saccharide concentration post-saccharification. A woody biomass washing waste liquid saccharification method according to the present invention is a saccharification method for a washing waste liquid obtained when woody biomass is washed. The woody biomass washing waste liquid saccharification method includes a washing step and a saccharification step. At the washing step, woody biomass is washed with water. At the saccharification step, an oxidizing agent is added to a washing waste liquid obtained at the washing step, and the washing waste liquid is saccharified to obtain a saccharified waste liquid.

To provide a methanation system and methanation method capable of suppressing the decline in reaction efficiency in methanation using biogas.SOLUTION: A methanation system comprises: a methane fermentation tank configured to ferment an organic waste to generate a biogas containing methane and carbon dioxide; a reactor configured to react the carbon dioxide generated in the methane fermentation tank with hydrogen supplied from a hydrogen supplier to generate methane; and a biogas introduction pipe for introducing biogas from the methane fermentation tank to the reactor, a first hydrogen supply pipe for supplying hydrogen from the hydrogen supply device to the reactor, and a second hydrogen supply pipe for supplying hydrogen from the hydrogen supply device to the methane fermentation tank; a carbon dioxide meter for measuring the amount of carbon dioxide introduced into the reactor through the biogas introduction pipe; and a controller, wherein the controller controls the amount of hydrogen supplied to the methane fermentation tank via the second hydrogen supply pipe, in accordance with the amount of carbon dioxide measured by the carbon dioxide meter.SELECTED DRAWING: Figure 1

System and process are provided for fixation of carbon dioxide through fermentation. More specifically, the disclosure includes fermenting carbon dioxide into methane through methanogenic archaea. The disclosure further provides the integration of methanogenic fermentation with additional processes to achieve improved carbon efficiency.

To provide a manufacturing method of a liquid fertilizer of high nitrogen concentration.SOLUTION: A manufacturing method of liquid fertilizer includes the steps of: supplying organic waste to a methane fermentation tank to which anaerobic microbes are provided; agitating and mixing the supplied organic waste and the anaerobic microbes; measuring pH of a methane fermentation liquid including the agitated and mixed organic waste; and adjusting, based on a value of the measured pH, the methane fermentation liquid to be of pH 6.50-7.30 by supplying acid to the methane fermentation tank.SELECTED DRAWING: Figure 1

To provide a fertilizer that uses incinerated ash produced by burning in a single fuel combusting boiler a woody biomass fuel, such as branch leaf material, bark material, trunk material, small diameter tree, and stool material, where an elution amount of hexavalent chrome is equal to or less than the soil environmental standards (0.05 mg / L) even without rendering hexavalent chrome harmless, and that is useful for growing plants.SOLUTION: A woody biomass incinerated ash fertilizer includes: incinerated ash of a woody biomass fuel configured of at least one kind of a woody material selected from a group consisting of branch leaf material, bark material, trunk material, small diameter tree, stool material, lumbering leavings, and palm coconut shells, where the branch leaf material is contained in an amount of 50.0 mass% or more; and at least one kind of organic fertilizer selected from a group consisting of poultry manure, swine dung, cow dung, horse dung, and food recycled methane fermentation residue.SELECTED DRAWING: None

To provide a technique for separating a novel lipase from a methane fermentation system and further identifying the microbial species responsible for the production of the lipase.SOLUTION: The present invention adopts a peptide selected from the group consisting of (a), (b), and (c) below, or a salt thereof: (a) a peptide comprising a specific amino acid sequence; (b) a peptide comprising an amino acid sequence in which one or more amino acids are deleted, inserted, substituted, and / or added in the specific amino acid sequence; and (c) a peptide comprising an amino acid sequence having at least 90% sequence identity to the specific amino acid sequence.SELECTED DRAWING: None

To provide a desulfurization apparatus capable of treating hydrogen sulfide while suppressing a decrease in methane gas concentration in biogas.SOLUTION: A desulfurization apparatus 16 biologically treats hydrogen sulfide in biogas generated by methane fermentation processing of organic wastewater or organic waste using sulfur-oxidizing bacteria, and includes: a reaction tank 20 to which the biogas is supplied; a non-porous hollow fiber membrane 22 installed in the reaction tank 20; an oxygen-containing gas supply device 24 that supplies an oxygen-containing gas to the hollow fiber membrane 22; an oxygen-containing gas exhaust pipe 26 that exhausts the oxygen-containing gas from the hollow fiber membrane 22 to the outside of the reaction tank 20; and a water spraying device 28 that sprays water onto an outer surface of the hollow fiber membrane 22. The hollow fiber membrane 22 allows oxygen in the oxygen-containing gas to permeate into the reaction tank 20 and supplies the oxygen to a biofilm including the sulfur-oxidizing bacteria formed on the outer surface of the hollow fiber membrane 22.SELECTED DRAWING: Figure 1

An organic wastewater treatment apparatus includes: a first treatment device configured to perform methane fermentation on organic wastewater containing a floating substance, an organic substance, and a nitrogen component under an anaerobic condition and perform membrane filtration to obtain membrane-filtered water; a second treatment device provided downstream of the first treatment device and including a vacuum degassing device that removes and recovers a part of dissolved methane in the membrane-filtered water; and a third treatment device provided downstream of the second treatment device and configured to perform post-treatment.

Method for the material and energetic utilization of biogenic residues from potato processing plants by using the residues in a wet fermentation process, by concentrating the total nutrient potential in the form of nitrogen, phosphorus, potassium and sulfur in a fertilizer fraction obtained from the fermentation residues, and by providing the desulfurized biogas for energy utilization, characterized in that that yeast fermentation is used for bioethanol production and / or methane fermentation for biogas production as wet fermentation processes, that the resulting biogenic residues from the processing of starchy root vegetables, such as potatoes, sweet potatoes, cassava, tapioca, and other root vegetables, are obtained in the form of peelings, starchy white waters, residues from the cleaning of input materials, stillage from the upstream ethanol distillation, aqueous media from periodic plant cleaning, and / or sludge. that the available residual materials are subjected to a suspension process, that, by using additives with a dry matter content of at least 25% in the biosuspension, a dry matter content between 12 and 18% is achieved, that the generated biosuspension is subjected to an aerobic hydrolysis process, that the hydrolysate produced from the biosuspension is fed into an anaerobic fermenter system consisting of at least one hydraulically and partially mixed fermenter with an initially introduced and continuously reproducing special culture, that the potential of plant nutrients contained in the utilized input materials is obtained as a mixture of the solid phase of the fermentation residues and the liquid washing media resulting from the removal of inhibitory substances from the biofiltrates with high levels of ammonium and sulfur compounds, and that the desulfurized, dried and compressed biogas is used for the combined generation of electrical and thermal process energy.

To provide a simple-structured methane fermentation tank that can stir the fermentation broth well even when the solid concentration of the fermented sludge is high and has excellent fermentation efficiency. 【Solution means】A methane fermentation tank comprising an outer cylinder with closed upper and lower ends, and at least one inner cylinder arranged inside the outer cylinder with a closed upper end and an open lower end. The internal space of the outer cylinder and the internal space of the inner cylinder communicate with each other at the lower part, and there is a lower communication path that allows the fermented sludge to flow between the outer cylinder and the inner cylinder. There is a liquid level difference forming mechanism that supplies biogas from the outside to the outer cylinder or the inner cylinder to form a liquid level difference between the liquid level of the fermented sludge stored in the outer cylinder and the liquid level of the fermented sludge stored in the inner cylinder. There is an upper communication path that communicates the gas phase spaces formed at the upper parts of the outer cylinder and the inner cylinder and can switch the communication state between open and closed. The horizontal cross-sectional area of the inner cylinder with respect to the horizontal cross-sectional area of the outer cylinder is set in the range of 0.3 to 0.7 times.

This technology allows for the simple and efficient separation and capture of carbon dioxide originating from biomass and waste, without the need for the development of separation and capture facilities using carbon dioxide absorption liquids, adsorbents, or separation membranes. It also recovers the recovered carbon dioxide gas as liquefied carbon dioxide or solid carbon, which is easy to transport, use, and fix, thereby reducing carbon dioxide emissions associated with the removal of carbon dioxide from the atmosphere and the combustion of waste. [Solution] Fuel gas is obtained by methane fermentation of waste or by pyrolysis gasification under anoxic conditions or with oxygen supply, and the obtained fuel gas is reacted with oxygen to generate electricity. After power generation, the exhaust gas is cooled while recovering and utilizing the exhaust gas heat, and the moisture in the exhaust gas is condensed and liquefied and removed. The resulting condensed water and the generated electricity are used to produce oxygen needed for pyrolysis gasification or oxygen-utilizing power generation, thereby recovering high-concentration carbon dioxide gas. Furthermore, the recovered carbon dioxide gas is compressed and liquefied using the generated electricity to obtain liquefied carbon dioxide or dry ice, or solid carbon or carbon monoxide is obtained by molten salt electrolysis using the generated electricity.

The invention discloses a strain combination, a methane fermentation system and a preparation method, and belongs to the technical field of microorganisms. In the methane fermentation system provided by the invention, lignocellulose in crop straws is firstly and preliminarily hydrolyzed into soluble saccharides by natural hydrolytic flora in an inoculum, and then the soluble saccharides are fermented by lactobacillus plantarum to generate intermediate products such as lactic acid, acetic acid, ethanol, hydrogen, carbon dioxide and the like; further, intermediate products such as lactic acid and ethanol are converted into methane-producing precursors such as hydrogen and acetic acid through natural microbial flora in the inoculum; subsequently, in the methane production stage, methanosarcina utilizes hydrogen and carbon dioxide to produce methane in a hydrogen nutrition mode, utilizes acetic acid to produce methane in an acetic acid nutrition mode and / or utilizes methyl substances to produce methane in a methyl nutrition mode, accumulation of intermediate products is avoided, and the conversion efficiency of a substrate and the methane yield are improved.