4 results about "Anaerobic digestion" patented technology

The invention provides a method for generating electricity by excrement methane of a livestock and poultry farm. The method comprises the following steps: (1) collecting excrement generated in the livestock and poultry farm; (2) performing anaerobic digestion on the excrement to generate methane; and (3) generating electricity by utilizing methane. The method preferably comprises the following steps: (11) filtering excrement and (12) precipitating the excrement between step (1) and step (2), (21) purifying methane between step (2) and step (3), and (4) using the generated electricity by self and/or accessing to a public power grid after the step (3). The invention further provides a related system. According to the method for generating electricity be excrement methane of the livestock and poultry farm, the excrement in the livestock and poultry farm is utilized to generate methane and generate power, so that the excrement in the livestock and poultry farm is prevented from polluting the environment, the comprehensive utilization of excrement in the livestock and poultry farm can be promoted, waste is turned into wealth, and economic benefit is generated. The method and system are suitable for large-scale popularization and application.

The invention provides a biogas carbon reduction coupling biogas slurry pollution reduction device and method based on biogas circulation type fermentation, and belongs to the technical field of environment and energy. The device comprises an electric fermentation unit, a solid-liquid separation unit, a hydrothermal carbonization unit and a product collection unit, wherein the electric fermentation unit comprises an electric fermentation tank, a cathode chamber, an anode chamber, a cation exchange membrane and a direct-current constant-voltage power supply; according to the device, biotransformation of hydrogen-philic methanogens and electrochemical cathode reduction are coupled, biogas is circulated to an anaerobic digestion chamber, in-situ biogas biological purification is carried out, ammonia nitrogen and COD in biogas slurry are removed in an anode chamber while CO2 is reduced at a cathode to generate methane, and electron transfer and conservation rules are reasonably utilized; the biogas slurry can be used for irrigation after pollution reduction, and residual pollutants in the biogas slurry can also be adsorbed by biogas residue biochar to be further purified; the biogas residues can be prepared into hydrothermal carbon to be reused for anaerobic digestion or used as an adsorbent, so that the aims of comprehensive utilization of biogas slurry, biogas residues and biogas and CO2 emission reduction are fulfilled.

The invention discloses a kitchen waste leachate treatment and utilization device which comprises a high-temperature anaerobic digestion bin, an anoxic reaction bin and a membrane separation bin; a first stirring device and a folded plate are arranged in the high-temperature anaerobic digestion bin, and an isolation bin in which microbe balls for fixing anaerobic bacteria are placed is arranged at the lower part of the high-temperature anaerobic digestion bin; the high-temperature anaerobic digestion bin is communicated with the anoxic reaction bin, a hollow second stirring device is arranged in the anoxic reaction bin, and aeration holes are formed in stirring blades; through aeration holes, dissolved oxygen with a certain concentration is introduced into the anoxic reaction bin as required; an outlet of the anoxic reaction bin is communicated with a pressure pump; an outlet of the pressure pump is communicated with a nanofiltration membrane water outlet pipe which is positioned in the membrane separation bin and is made of a nanofiltration membrane; micromolecular organic substances in the wastewater are further concentrated in a nanofiltration membrane water outlet pipe, and clear water passes through the nanofiltration membrane to be gathered in the membrane separation bin and then is connected into the water inlet of the high-temperature anaerobic digestion bin through a clear water return pipe. The device is high in resource utilization rate, high in degradation efficiency and low in clean sludge output.