40results about How to "Improve methane production efficiency" 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 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.

Increasing competition for fossil fuels, and the need to avoid release carbon dioxide from combustion of these fuels requires development of new and sustainable approaches for energy production and carbon capture. Biological processes for producing methane gas and capturing carbon from carbon dioxide are provided according to embodiments of the present invention which include providing an electromethanogenic reactor having an anode, a cathode and a plurality of methanogenic microorganisms disposed on the cathode. Electrons and carbon dioxide are provided to the plurality of methanogenic microorganisms disposed on the cathode. The methanogenic microorganisms reduce the carbon dioxide to produce methane gas, even in the absence of hydrogen and / or organic carbon sources.

The invention discloses a method for recycling waste crop straw. The method comprises the following steps: (1) smashing crop straw, namely cutting the crop straw into sections, and blasting at the pressure of 0.2-2.0MPa for 0.5-1 minute with steam, wherein each section of the crop straw has a length of 3-15cm; (2) fermenting, namely adding ammonia, peptone, bran and chopped peanut shells into the blasted crop straw sections, regulating the molar ratio of carbon to nitrogen (C to N) to 20:30, adding activated sludge from a methane-generating pit, and carrying out solid state fermentation at a temperature of 20-55 DEG C for 10-20 days until combustible gases are generated; and (3) squeezing fermented waste residue to remove part of water, mixing with unfermented smashed crop straw, phosphoric acid or potassium chloride, drying a mixture until water left therein is not more than 10%, molding by extruding, carbonizing, activating with steam, cooling, and smashing to obtain activated carbon, wherein the raw materials molded by extruding contain 90-95% of fermented waste residue, 5-10% of unfermented smashed crop straw, 1-5% of phosphoric acid or potassium chloride and the balance of water, and the crop straw is wheat straw, rice straw, corn straw or soybean straw.

A reaction system suitable for resource utilization of organic solid waste, which belongs to the field of anaerobic biological treatment of solid waste, can solve the problems of easy "acidification" in the reaction process of the prior art, low fermentation efficiency and gas production efficiency, including high temperature Hydrolysis fermentation reaction device, medium temperature acidification fermentation reaction device and methane fermentation reaction device, three independent reaction devices respectively form hydrolysis dominant bacteria group, acid production dominant bacteria group and methanogenic bacteria group and provide the best conditions for their growth , which can effectively avoid the phenomenon of "acidification" and cause the reaction device to fail to operate normally. Each device injects the biogas slurry into the next reaction device through the water distribution device through the jet pump on the connecting pipe, which can not only fully stir the reaction device, increase the contact area between the reaction substrate and the sludge, and reduce the failure of mechanical agitation, Problems such as high energy consumption can also achieve the purpose of biogas slurry circulation, so that organic solid waste can be thoroughly fermented again, and the generation of biogas residue can be reduced.

The invention discloses a semi-continuous ammoniated straw and biogas residue sandwich mixed fermentation device, which includes a fermentation tank, a biogas slurry circulation pipeline and a fermentation feeding device. The fermentation unit is composed of vertically arranged fermentation units, and each fermentation unit includes an ammoniated straw layer, a biochar layer and a biogas residue layer arranged from top to bottom; Outlet; one end of the biogas slurry circulation pipeline is connected to the liquid outlet of the fermenter, and the other end is connected to the liquid inlet of the fermenter; the fermentation feeding device is connected to the feed port of the fermenter The feed pipe in turn transports biogas residue, biochar and ammoniated straw to the fermentation tank. The mixed fermentation device mixes and ferments biogas residue and ammoniated straw to optimize material ratio and improve gas production efficiency. At the same time, it adopts biogas slurry circulation spraying method, no need for stirring, simple operation and low input cost.

The invention discloses a block-based anaerobic treatment method for organic wastewater, which belongs to the technical field of water treatment. It includes the following steps: 1) passing the water body to be treated into a flocculent sludge treatment unit inoculated with flocculent sludge for treatment; 2) passing 1) effluent into a transition unit for treatment, and the transition unit contains flocculent Sludge and granular sludge; 3) passing 2) the effluent into a granular sludge treatment unit inoculated with granular sludge for treatment; wherein part of the effluent of the granular sludge treatment unit is returned to the flocculent sludge treatment unit and / or Or transition unit and / or granular sludge treatment unit. According to the advantages of different sludges, the present invention sets different sludge partitions, precisely controls the process parameters at different stages, greatly improves the treatment efficiency of the anaerobic process, and increases the output of granular sludge.

The invention relates to a method for pretreatment to biological substance waste materials and the biotechnology of resource utilization of the biological substance waste materials. Firstly, biogas slurry is used for pretreatment to the biological substance waste materials, and then rumen microorganism is used for anaerobic biotransformation; the fermentation process is that a rumen fluid is taken out of rumina of ruminants and inoculated into an anerobic fermentation reactor containing biological substance waste materials subjected to pretreatment and a buffer solution; the anerobic fermentation reactor runs to collect produced methane, and liquid phase and solid phase products. According to the invention, the dry matter digestion rate of biological substance waste material is improved by 10 to 20 percent, the fermentation time is shortened for 3 to 10 days, and the methane producing efficiency can reach 210 to 250 mL / g (moisture free weight). The biogas liquid produced by fermentation can be used for pretreatment in a recyclable way, and also can be used as an organic fertilizer after biogas residue treatment.