65results about How to "Increase methane production" patented technology

The invention provides a method to decrease emission of carbon dioxide from combustion of fossil fuels or other hydrocarbons and to enhance the efficiency of methane production from anaerobic biodigesters. The invention involves feeding carbon dioxide from the exhaust gas of hydrocarbon fuel combustion to an anaerobic biodigester where biomass is anaerobically fermented to produce methane. Carbon dioxide is an electron acceptor for anaerobic fermentation, and thus some of the carbon dioxide is reduced to methane, which can again be used for fuel. In this way, at least a portion of the exhaust gas CO₂ is recycled to form fuel methane instead of being released into the atmosphere. Thus, the net CO₂ emission from burning a given amount of fossil fuel is decreased. Adding carbon dioxide to an anaerobic fermentation also increases the efficiency and amount of methane production in the fermentation.

The invention provides an immobilization method for anaerobic fermentation strain activated sludge, and belongs to the anaerobic fermentation field. The prior activated sludge immobilization study mainly focuses on organic waste water treatment, while the activated sludge immobilization study on the anaerobic fermentation is not taken up. The method comprises the following steps of: taking concentrated activated sludge, and then adding a solid carrier into the sludge with a mass ratio of the solid carrier to the concentrated activated sludge being 1 to 0.5-10; fully mixing the solid carrier and the concentrated activated sludge, then putting the solid carrier absorbing the activated sludge in a cross-linking agent, and drying to produce immobilized particles; and carrying out cross linking of the produced immobilized particles for 0.5 to 8 hours, and then putting the immobilized particles after cross linking in a curative agent to carry out solidification for 0.5 to 10 hours. The obtained immobilized activated sludge can be widely applied to the anaerobic fermentation of catering organic wastes, straws, animal droppings on cultivation farms and other organic wastes for preparing the clean energy of methane.

The present invention relates to the field of degradation with hyperthermophilic organisms, and in particular to the use of hyperthermophilic degradation to produce heat and energy rich components including hydrogen and ethanol from a biomass. In some embodiments, a biomass is fermented in the presence of hyperthermophilic organisms to produce heat. The heat is used to heat a liquid which is used directly in a heat pump or radiant heat or to produce electricity or drive a steam turbine. In some embodiments, acetate is utilized as a substrate to produce energy by methanogenesis.

The invention belongs to the technical field of solid waste treatment, in particular relates to a combined pre-treatment method for improving sludge disintegration effect and strengthening subsequent anaerobic digestion, comprising the following concrete steps of: gravity settling and thickening residual sludge generated in a secondary settling tank of a municipal sewage treatment plant, sending the thickened sludge into an ultrasonic reactor for ultrasonic irradiation and adding NaOH; sending the sludge into a sludge anaerobic digestion reactor for subsequent medium temperature anaerobic digestion after the combined action of ultrasonic and NaOH; and collecting methane generated by digestion and measuring the yield of the methane with a gas collection device. The method firstly uses ultrasonic and NaOH jointly for sludge treatment, the soluble COD concentration in sludge liquid phase after treatment is improved by about 52 times, the methane yield is improved by 40.6 percent, and the problem of limited application of ultrasonic due to high energy consumption is largely overcome; and the method is applicable to the treatment of residual sludge in sewage treatment plants, and can be achieved by making corresponding modification on the current treatment facilities of sewage treatment plants for different-scale sewage treatment plants, thus having wide application prospect.

Integrated sewage or digestible wastes, and fats, oils, greases and waxes (FOG) waste treatment methods, systems and facilities include a slipstream loop incorporating circulation pumps, hot water heat exchangers and conventional anaerobic digesters for continuously circulating actively digesting sludge at a rate to preclude solid settlement accumulation as a warm flowable slurry source. The warmed actively digesting sludge is pumped from the slipstream loop through a rock trap into a delivery/input loop both for aiding transport or delivery of FOG waste to, and for partially filing a closed receiving/conditioning holding tank, where the warmed actively digesting sludge softens and liquefies the FOG wastes offloaded into the holding tank for further treatment at a desired treatment temperature range (whether psychrophilic, mesophilic, or thermophilic). The contents of the closed receiving/conditioning holding tank are continuously mixed by a bottom-top recirculation chopper pump to pre-treat the FOG wastes, liquefying and decreasing solids particle size allowing acidogens in the actively digesting sludge to pre-digest such wastes producing volatile fatty acids, some biogas and a highly bioreactive, flowable feedstock slurry. The produced highly bioreactive, flowable feedstock slurry can then injected back into the actively digesting sludge slipstream loop at a controlled rate where the resultant mixture then is introduced, together with raw sewage or other digestible wastes, into input or head ends of waste treatment systems having anaerobic digesters for digestion of solids and steady-state methane production. Advantages of the integrated system relate to a partial digestion of the FOG in the reaction/holding tank generating volatile fatty acids that suppress expression of methane producing methagens in the holding tank, increased steady-state methane production and significantly reduced solids volume of treated digestible wastes (sewage) and FOG wastes.

The invention relates to a method for producing a clean energy source by a continuous feeding type anaerobic fermentation method, particularly to a continuous feeding type anaerobic fermentation method for preparing methane by fermenting catering organic waste. The method for producing the clean energy source through continuous feeding type anaerobic fermentation can be widely used for preparing the methane which is a clean energy source through the anaerobic fermentation of the catering organic waste, straws, animal excreta in farms and other organic waste. The method comprises the following steps of: draining partial moisture of the collected catering organic waste to enable the water content thereof to be not more than 80 percent, and then adding the processed catering organic waste and acclimated anaerobic activated sludge in a definite proportion into a reactor for fermentation. The catering organic waste is added into the reactor by adopting a continuous feeding method in the fermentation process, and a fermentation raw material is added once at regular intervals. An addition period is a gas production vigorous period. The addition is 0.1-10 percent of the volume of the reactor. An anaerobic state is strictly controlled in the whole process so as to facilitate the growth of anaerobes.

A method of producing in a bioreactor a biogas rich in methane involves electrolyzing water in an aqueous medium at a voltage in a range of from 1.8 V to 12 V in the presence of electrochemically active anaerobic microorganisms that biocatalyze production of hydrogen gas, and, contacting a species of hydrogenotrophic methanogenic microorganisms with the hydrogen gas and carbon dioxide to produce methane. Volumetric power consumption is in a range of from 0.03 Wh/L_R to 0.3 Wh/L_R. Current density is 0.01 A/cm_E² or lower. The voltage is sufficient to electrolyze water without destroying microbial growth. Such a method results in improved electrolysis efficiency while avoiding the use of noble metal catalysts. Further, a combination of water electrolysis with anaerobic degradation of organic matter results in increased biogas quality and in increased biogas quantity and yield. Oxidation of hydrogen sulfide contributes to the increased quality, while an increase in the rate of organic matter hydrolysis and an increase in the production of methane from hydrogen contributes to the increased quantity and yield.

The invention discloses a composite bacterial agent for methane fermentation, which relates to a composite preparation of microbial fermentation bacterial liquid. In the invention, the problem of lacking bacterial gent applicable to methane fermentation using cow dung as a main raw material and bacterial agent applicable to medium and large methane fermentation projects is solved. The composite bacterial agent comprises 8 to 15 weight parts of bacteroides cellulosolvens fermentation liquor, 12 to 20 weight parts of clostridium pasteurianum fermentation liquor, 30 to 45 weight parts of methanoculleussubmarinua fermentation liquor and 20 to 50 weight parts of methanosarcina mazei fermentation liquor. The number of the active bacteria of 1 milliliter of the fermentation liquor of each of the four kinds of bacteria is greater than 10<9>. The composite bacterial agent for the methane fermentation using the cow dung as the main raw material can make gas production earlier and improve gas yield and methane yield effectively.

Process for stimulating and maintaining the activity of a microbial consortia within a subterranean solid carbonaceous medium to produce methane are described. The process comprises the steps of: (A) dosing a first nutrient composition into the microbial consortia environment, (B) monitoring the microbial consortia environment, including the generation of methane therein; (C) dosing a second nutrient composition into the microbial consortia based upon the results of step (B); and (D) repeating steps (B) and (C) and, if required, (E) dosing a further nutrient composition into the microbial consortia environment based upon the results of step (D).

The invention belongs to the technical field of environmental protection and relates to a method for improving production of methane from surplus sludge of a wastewater treatment plant. The method comprises the following steps of: (1) thoroughly mixing sludge with ryegrass for fermentation, hydrolysis and acid production; and (2) performing anaerobic fermentation on the mixture obtained in the step (1) to generate methane. The method for prompting the production of methane from surplus sludge of the wastewater treatment plant with energy grass is capable of improving the yield of short chain fatty acids and the yield of methane from sludge at the same time, and also capable of recovering and reutilizing organic matters in the sludge more thoroughly; and pollution of sludge on the environment is reduced.

A method and apparatus for a steam biomass reactor converts organic waste placed inside a sealed steam injected reactor to biogas (methane CH₄ and carbon dioxide CO₂). The amount of liquid introduced into the reactor can be minimized, increased methane and CO₂ can be produced, and the methane produced can have higher Btu values as compared to methane produced in other reactors. Some embodiments provide a method of injecting steam into a sealed vessel that is loaded with organic waste and collecting the methane produced by accelerated decomposition/biodegradation of the organic component of the waste within the vessel. The steam accelerates the decomposition of the organic refuse, thereby enhancing the production of methane gas and CO₂.

A coalbed methane borehole pipe liner perforation system comprises a plastic pipe punch that slips down inside a coalbed methane production borehole lined with a non-perforated plastic pipe. A ground-penetrating radar is used inside the plastic-pipe lined borehole to determine which sections of the pipe are in contact with groundwater. The punch is then operated along the length of the plastic-pipe lined borehole to perforate it for methane-gas collection wherever such groundwater is not present. A radar survey to determine groundwater contact can be made simultaneously in combination with the punching of liner pipe perforations, or earlier in a separate operation.

The invention relates to an organic waste anaerobic digestion method. The method comprises the steps of adding organic waste, inoculum and a catalyst rich in high efficiency microorganisms to a reactor, and performing stirring for a reaction to generate methane. The catalyst adopts a magnet as a basal body and ferroferric oxide as a surface adsorber to enrich electrical activity microorganisms capable of realizing efficient anaerobic transformation of the organic waste and enable the microorganisms to be quickly combined with the ferroferric oxide on the surface of the magnet to form a biomembrane, the rate for generating the methane through anaerobic digestion is increased, the organic loading and the methane generating amount of an anaerobic digestive system can be increased, and the reaction period can be shortened. Compared with the prior art, the catalyst is used for enriching the electrical activity microorganisms capable of realizing efficient anaerobic transformation of the organic waste and enabling the microorganisms to be quickly combined with the ferroferric oxide on the surface of the magnet to form the biomembrane, the rate for generating the methane through anaerobicdigestion is increased, the organic loading and the methane generating amount of the anaerobic digestive system can be increased, and the reaction period can be shortened.

The present invention belongs to the field of microbial technology and discloses a microbial preparation for sludge anaerobic fermentation. The microbial preparation comprises a mixed bacteria liquid and a carrier, wherein the mixed bacteria liquid is prepared from Bacillus pumilus, enterobacter cloacae, denitrifying bacteria, paracoccus denitrificans, bacillus amyloliquefaciens, and lactococcus lactis. The microbial preparation can greatly increase the amount of methane generated by sludge, increase the utilization rate of the sludge, and recycle the sludge.

The present invention discloses a method and a system of treating biomass wastes by biochemistry-thermochemistry multi-point interconnection. The present invention applies solid, gas and liquid products of the thermochemical treatment subsystem to the biochemical treatment subsystem and applies heat produced by the biochemical treatment subsystem to the thermochemical treatment subsystem, forming multi-point and two-way interconnection between the biochemical treatment subsystem and the thermochemical treatment subsystem, thereby increasing the yield and stability of energy gas of the biochemical treatment subsystem and reducing pollution and energy consumption of the thermochemical treatment subsystem respectively. The present invention is suitable for treating biomass wastes with high and low water contents at the same time, producing soil amendment, liquid fuel and biogas, having properties of low secondary pollution and significant reduction of greenhouse gas emission and so on. The bio-stability, humus content and nitrogen content of the solid product are as high as soil amendment, making it easy to store and transport.

The invention belongs to the technical field of industrial sewage treatment, and particularly discloses a method and a device for improving the treatment efficiency of an anaerobic reactor in a pharmaceutical wastewater treatment process, and the device comprises the following two systems: a microorganism domestication system which is used for carrying out domestication culture on microorganisms in an anaerobic reactor, and pumping the domesticated microorganisms into the anaerobic reactor; and a biogas impurity removal and utilization system which is used for enabling biogas to sequentially pass through a CO2 and H2S removal system, a dehydration system and a biogas storage tank; feeding part of biogas into a boiler for combustion through a booster fan; and enabling the other part of the biogas to be mixed with effluent of an anaerobic reflux pump and to enter the anaerobic reactor, so that the aims of mixing and stirring gas and liquid and reducing the concentration of CO2 in an anaerobic system are fulfilled. According to the method disclosed by the invention, the COD (Chemical Oxygen Demand) removal rate of the anaerobic reactor is increased by about 10% and the methane yield is increased by about 15% by combining the microbial acclimation system, the marsh gas impurity removal system and the anaerobic reactor, so that the treatment efficiency of the anaerobic reactor is greatly improved, and favorable conditions are provided for subsequent working sections.