716 results about "Biogas production" patented technology

The present invention provides methods for the generation of methane by a two phase anaerobic phase system (APS) digestion of organic substrates. Also provided is a device for practicing the methods of the invention. The APS-digester system is a space-efficient, high-rate solids digestion system. The APS-digester system consists of one or more hydrolysis reactors, a buffer tank and one biogasification reactor.

The invention relates to a methane-generating pit using poultry excrement, which is integrally horizontally placed under the water plane. Partition walls are arranged in the middle of the methane-generating pit for dividing the whole methane-generating pit into a plurality of unit methane-generating pits, and medium channels arranged on the partition walls are communicated with each other. An annular fermentation tank is arranged above the periphery of the methane-generating pit, a plurality of superconductive heat pipes are arranged on the inner side of the annular fermentation tank, and the superconductive heat pipes are inserted into the methane-generating pit. A material inlet and a material outlet are respectively arranged at two ends of the methane-generating pit and under the unit methane-generating pits at two ends of the methane-generating pit, a methane collector is arranged above each unit methane-generating pit, and the methane collectors are directly communicated with a gas storage tank through pipelines. The methane-generating pit has the advantages of being high in material concentration, integrating material inlet, deslagging, methane generating, stirring, temperature controlling, regulating and the like, being high in mechanization degree, large in treating quantity, fast in digesting rate and the like and can meet requirements for scale production, and concentration of inlet materials of a continuous methane-generating pit can reach about 15%.

The invention provides a method for producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes, which comprises the following steps: the perishable organic wastes are hydrolyzed in a hydrolysis acidogenic reactor, and a mixture obtained after hydrolysis is acidified to generate a large number of organic acid products with low molecular weight; the bottom of the hydrolysis acidogenic reactor is communicated with the bottom of a methanogenic reactor through a circulation pump and a pipeline; the top of the methanogenic reactor is communicated with the top of the hydrolysis acidogenic reactor; and the acetic acid producing reaction is carried out in the methanogenic reactor and the methane producing reaction is continuously carried out. The invention can separate the hydrolysis acidogenic process from the acetic acid and methane producing process in the anaerobic digestion process so as to prevent organic acids generated by the perishable organic wastes from inhibiting methanogenesis. The device has simple processing procedure, low cost, easy maintenance and stable and reliable performance, is suitable for anaerobic digestion treatment of various perishable organic wastes, and has highly efficient and stable biogas production capacity of the perishable organic wastes through the anaerobic digestion.

The invention discloses a kitchen waste disposal method, which comprises the following steps of: (1) screening and crushing kitchen waste; (2) carrying out damp and hot hydrolytic treatment; (3) carrying out solid-liquid separation; (4) carrying out fat separation; (5) pulping; (6) carrying out fermentation pretreatment, and (7) converting solid matter microorganism. According to the kitchen waste disposal method disclosed by the invention, from the view point of improving the biodegradation efficiency and the biogas production efficiency of the kitchen waste, the methane is prepared from compound microorganism bacterium agent and the processed kitchen waste by mixing and fermenting, and the microorganism bacterium agent fundamentally solves the problems of high saline matter and high fat of the kitchen waste and odour in a biological treatment process, and greatly improves the efficiency of producing the methane by anaerobic digestion.

The invention discloses a secondary anaerobic fermentation and power generation system for large-middle scale biogas engineering, which belongs to a biogas production device. The invention aims to provide a biogas production system which can be used for centralized power generation. The system comprises a pretreatment tank, a primary fermentation tank, a secondary fermentation tank and a biogas residue tank; the pretreatment tank (16) is communicated with a USR reactor (14) through a feeding pipe (15), the USR reactor is communicated with the secondary fermentation tank (10) through an overflow pipe (21) and a gas conduit (2), and the USR reactor (14) and the secondary fermentation tank (10) are communicated with the biogas residue tank (11) through a residue discharge pipe (12) respectively; and the secondary fermentation tank supplies biogas for a generator through a biogas purification device (3). The system realizes the conversion of biogas fermentation from a small-scale production mode to a centralized high-efficiency large-scale mode, and has the advantages of low cost, high efficiency of wastewater treatment, high gas yield and the like; and the system can be matched with large-scale livestock and poultry farms for construction, thereby achieving the aims of saving energy sources, reducing the emission, and protecting the agricultural ecological balance.

An ambient anaerobic digester system for anaerobic digestion of animal waste with biogas production and recovery is provided. The anaerobic digester system includes a substantially flexible bladder for anaerobically digesting the animal waste with biogas production and transmitting the biogas to at least one biogas storage container, biogas use device or a combination thereof. In a preferred form, the substantially flexible bladder has a waste inlet, a digester effluent outlet, one or more sludge access ports and a biogas outlet in a top surface thereof.

The anaerobic digester system may inexpensively, simply, reliably, and effectively be used to treat animal waste without energy expenditure and little capital expense, thus minimizing pollution typically caused by animal waste.

The present invention on relates to a method and a system for conversion of organic waste into biogas, i.e. a methane containing gas, with an improved efficiency and economy. The system comprises a reactor (3) for holding organic waste for production of biogas by digestion and having an output for digested waste, and an anaerobic tank (6) that is connected to the reactor (3) output for anaerobic hydrolysis of the digested waste and having an output for hydrolysed material that is connected to an input of the reactor for adding hydrolysed material to the content of the reactor. The anaerobic hydrolysis process makes the energy content of material that has not been digested in the reactor available for bacterial digestion and thus, the hydrolysed material is fed back into the reactor for further bacterial conversion into biogas.

A biocomposite is produced from natural fiber fabrics embedded in a matrix of biosynthetic polyhydroxy-alkanoate (PHA) polymers. The PHA is synthesized using aerobic microbial biosynthesis using mixed bacterial cultures and a feedstock containing anaerobic degradation products such as methane and volatile fatty acids derived from microbial biodegradation of organic waste materials, which may include waste biocomposites. Monomers may be added to the synthesized PHA polymer to control mechanical properties of the resulting biocomposite. The natural fibers and/or PHA may be pretreated using various techniques to improve the bond between the fibers and the PHA resin matrix and water absorption resistance of the fibers. The composite may be a laminate of treated and untreated fabric layers, or differently treated layers, to achieve good in-service performance as well as rapid and/or optimal biogas production when taken out of service and put in an anaerobic environment to degrade.

The invention discloses a livestock/poultry breeding wastewater resource utilization and regeneration recycling method which comprises the following steps of: (1) anaerobic digestion to produce biogas; (2) slag removal; (3) ammonia nitrogen removal; (4) biochemical treatment on a biological aerated filter (BAF); (5) disinfection; and (6) preparation of organic fertilizer. By combining the anaerobic technology, the denitrification technology, the BAF technology and the disinfection technology and adopting the livestock/poultry breeding wastewater as a resource, the method disclosed by the invention performs anaerobic fermentation treatment on the wastewater to produce biogas; the wastewater after the biogas production is subjected to solid-liquid separation; the solid slag is used as a raw material for producing organic fertilizer; the wastewater after the production of organic fertilizer is treated by the BAF technology and disinfected before recycling and up-to-standard emission; and the device realizes good treatment effect, low energy consumption and comprehensive utilization of resources while bringing economic benefits.

The invention discloses an intestinal-tract type biogas generating system, and belongs to the field of biogas production devices. The intestinal-tract type biogas generating system comprises a multiple-entrance feeding device, an intestinal-tract type fermentation pipe path and a biogas collecting device. The multiple-entrance feeding device mainly comprises a plurality of sewage collectors which are arranged at a high place, collecting pipes connected with the sewage collectors and a total feeding pipe. The intestinal-tract type fermentation pipe path comprises a pipe storage chamber which is deeply digged underground, and multilayer-overlaying fermentation pipelines, wherein the fermentation pipelines are buried underground, and are bended and spiraled like the intestinal tract. A feeding port of the fermentation pipelines is connected with the total feeding pipe. The biogas collecting device comprises a plurality of biogas collecting pipes and a gas storage component, and the plurality of biogas collecting pipes are respectively leaded out from a plurality of gas taking ports of the uppermost fermentation pipeline. Through use of the intestinal-tract type biogas generating system, organic materials such as excrements and the like can be fully fermented, automatic feeding, automatic feed-discharging, automatic separating of the materials, and automatic conveying of the materials to the fields can be realized, and no caking and no slag is produced, so that the intestinal-tract type biogas generating system is energy saving and environmentally friendly.

The invention discloses household solid garbage recycling and renewable biological carbon circulating technology, which solves the problem that biogas generated from household garbage is difficult to ferment at places with low temperature, and realizes an integral circulating zero-carbon emission system and a large-size renewable biological carbon circulating system simultaneously. The technical scheme includes that pretreated household garbage is fed into a large-size biogas digester to ferment, biogas is supplied for oxygen-enriched combustion of a gas turbine gas to generate power, biogas slurry is used as a biofuel cell substrate and is cleaned and used for power generation, and biogas residue is used as biological organic fertilizer and used for growth of fast-growing trees for biomass fuel power plants. Flue gas generated in combustion in the power plants circulates to guarantee fermenting temperature of the biogas digester so as to realize biogas production stably and efficiently. Pure oxygen and recycled tail gas are used as combustion supporting gas of the power plants, and accordingly combustion efficiency can be improved while cost for treatment of tail gas is reduced. CO2 in the flue gas is captured according to the carbon capture technology, and accordingly the zero-carbon emission system is realized. In addition, the renewable biological carbon cycling system is realized by means of biological treatment to biogas slurry and biogas residue.

The invention discloses a hydrate sediment flow solid output measuring device combining an X-CT technology and a measuring method. The measuring device comprises an X-ray penetration type reaction kettle, an X-CT scanning analysis system, a vacuum system, a temperature and pressure control system, a hydrate sample preparation system, a sand production monitoring system and a permeability measuringsystem, wherein through integrated application of a sand production-seepage system under the micro-scale multi-factor coupling effect, the coupling relationship of a reservoir structure and physicalspace-time evolution and flow solid output under the multi-factor collaborative action can be quantitatively described, different hydrate generation modes can be selected according to the experiment requirements, different hydrate occurrence states in natural sediments can be simulated and studied, and the device and the method can be used for researching the space-time evolution characteristics of a sediment pore structure under the hydrate convergence and divergence and effective stress conditions and an influence rule of the space-time evolution characteristics on sediment flow solid output, so that the theoretical bottleneck of the hydrate reservoir structure and a physical evolution and flow solid output mechanism in a hydrate production process is broken through, and the device and the method have important engineering significance to deeply understand a depressurizing production law of the South China Sea, practically improve the biogas production efficiency and perfect a depressurizing production technology system.

The present invention is directed to an organic substrate treatment system that converts organic substrate and other organic materials to nutrient rich effluent and biogas. Using sequential degradation of the organic materials, biogas and effluent is efficiently produced with relatively short digestion times. Additives are added to the organic materials prior to anaerobic digestion to enhance biogas production. A desulfurizer may be used to clean the raw biogas so that it is suitable for use with gas engines and boilers.

The invention relates to an automation solar energy biogas fermentation method, which belongs to the fields of environmental protection and chemical engineering. Aiming at the defects in the conventional biogas production process, the invention provides an automation solar energy biogas fermentation method and an automation solar energy biogas fermentation device, which can implement the steps of feeding, stirring, discharging, constant temperature and quantifying automatically in the north part of China in winter. The automation solar energy biogas fermentation method comprises the steps that: an automatic feeding delivery pump sends feces mixture in a feces collection pool into a material tank in a hydrolytic acidification treatment tank to carry out the hydrolytic acidification treatment; after being treated by the hydrolytic acidification treatment tank, the feces mixture is sent to a material tank in an anaerobic digestion tank by an automatic feeding pump; a solar thermal collector sends hot water into water collection interlayer of the hydrolytic acidification treatment tank and the anaerobic digestion tank by a temperature controlled pump and a solar energy hot water circulation system; and generated gas is injected into a gas holder for users to use after the treatment of desulfuration and solid-liquid separation. The automation solar energy biogas fermentation method and the automation solar energy biogas fermentation device are established on the basis of automatic program control of biogas feeding, stirring, discharging, constant temperature and quantity limitation, and correspond to the current development situation of the farmers of the animal breeding in China at present.

The invention relates to a method for producing biogas through the high-efficiency anaerobic fermentation of an organic waste resource in an intensive vegetable area. According to the method, an acidification-inhibiting microbial agent is directly added in crushed vegetable wastes to be mixed with the crushed vegetable wastes. Or, one or more than two components selected from fresh cow manure, fresh swine manure and straws processed by a fungicide are added in crushed vegetable wastes to be mixed with the crushed vegetable wastes. After that, water is added and stirred evenly and the C/N ratio and the water content of the obtained mixture are adjusted to be (20-30):1 and 88-90% correspondingly. In this way, a mixed material is obtained. Then an inoculum is added. The TS and the pH value of the obtained material are adjusted to be 8-12% and 7.7-8.0 correspondingly, so that a fermentation material is obtained. The fermentation material is subjected to anaerobic fermentation at the temperature of 35-38 DEG C. According to the technical scheme of the invention, vegetable wastes, adopted as a resource, are subjected to anaerobic fermentation to generate biogas. In this way, the problem that vegetable wastes are randomly piled to pollute the environment can be avoided. Meanwhile, the biogas production efficiency through the anaerobic fermentation process of vegetable wastes can be improved at the same time.

The invention relates to a methane-producing composite microbial inoculum and a preparation method thereof, which can solve the long-standing difficult problems that the existing biogas digester is lack of high-efficient methane-producing bacteria, thereby resulting in long initial start-up time of biogas production and poor stability of the biogas production. Methanosarcina acetoacidophilum DSM-N0.2834, methanobacterium formicicum DSM-No.1535, methanobrevibacter arboriphilicus DSM-No.1125, methanolobus tindarius DSM-No.2278 and methanothrix concilii DSM-No.6752 collected in German collection of microorganisms and cell cultures are adopted and inoculated in a liquid methane bacterial culture medium under the anaerobic condition, the independent enlarged culture is carried out grade by grade respectively, and bacterial liquid after the cultured methane bacteria is mixed together according to the volume ratio, thereby preparing a liquid methane-producing composite microbial inoculum; and the liquid methane-producing composite microbial inoculum can also be prepared into a solid methane-producing composite microbial inoculum. The method has reasonable design and adopts the high-efficient strains with the optimal combination and the rapid propagation technology, and the developed high-efficient methane-producing composite microbial inoculum can significantly accelerate the start-up time of the biogas production when in new construction of the biogas digester and large material change, and improve the efficiency and the stability of the biogas production of the biogas digester.

The invention relates to a method for increasing biogas production of thermophilic anaerobe systems. More closely, a biomass containing a consortium comprising polymer-degrading, acetogenic and methanogenic microorganisms is inoculated with a microorganism culture before the start of or during biogas production. Said microorganism is a thermophilic, acetogenic, hydrogen producing bacterium. As an example, Caldicellulosiruptor saccharolyticus is applied. According to the invention production if methane containing biogas is significantly increased.

The invention is useful for intensifying biogas production and thereby increasing its feasibility.

A combined installation is disclosed for the production of biogas and compost, including a dry fermentation fermenter for producing biogas in a batch mode, a biogas outlet, a purging gas inlet, a biogas line connected to the biogas outlet, a waste gas line, a waste gas chimney connected to the biogas outlet via a first biogas/waste gas line, a waste gas flare connected to the biogas outlet via a second biogas/waste gas line, a fresh air line connected to the purging gas inlet, a control means for connecting the biogas outlet to the biogas line or the biogas/waste gas chimney via the first biogas/waste gas line or the waste gas flare via the second biogas/waste gas line and for connecting the purging gas inlet to the waste gas line or the fresh air line, and a measurement means connected to the control means for detecting methane and carbon dioxide concentrations.

The invention relates to a method for simultaneously improving sludge anaerobic digestion efficiency and reducing the ecotoxicity of heavy metals. According to the method, after straws are activated with a ZnCl2 solution, straw biochar is prepared under a 550 DEG C high-temperature anaerobic condition, and further modification is performed by using an HCl solution and microwave; and by using modified biochar as carrier, a zero-valent nano-iron loaded modified biochar composite material HCl-FBC is prepared through a chemical reaction. According to the present invention, by adding the modified biochar composite HCl-FBC to the anaerobic digestion reactor at the initial stage of sludge anaerobic digestion, the organic matter conversion rate of sludge can be significantly increased, and the cumulative gas production of methane can be increased; HCl-FBC can easily increase the microbial diversity and the activity of the digested sludge and change the microbial community structure; and with the method, the sludge anaerobic digestion efficiency can be significant increased, the biogas production can be increased, the biological toxicity of the heavy metal in the digested sludge is effectively reduced, and the great significance is provided in the resource utilization of sludge and the reduction of the risk of sludge land use.