The present invention relates to a biomimetic-hybrid solvent system for simultaneous capture of H.sub.2S and CO.sub.2 from any gaseous composition. The present invention also relates to a process for upgradation of biogas to bio CNG by removing gaseous contaminants, including microbial removal of H.sub.2S, to obtained purified CO.sub.2. The biomimetic-hybrid solvent system contains three components selected from tertiary amine compounds, a functional colloidal fluid, and an enzyme mimic.

Processes, systems, and associated control methodologies are disclosed that control the flow of biogas during the biogas cleanup process to create a more consistent flow of biogas through the digester, while also optimizing the output and efficiency of the overall renewable natural gas facility. In representative embodiments, a biogas buffer storage system may be used during the cleanup process to control the pressure and flow rate of biogas. The biogas buffer storage system may monitor and control the biogas flow rate to either bring down or increase the digester pressure, thereby maintaining a normalized biogas flow rate.

The invention relates to a fermenter vessel (1) of a biogas plant, having at least one height-adjustable agitator (8), wherein the agitator (8), in the fermenter vessel (1), is guided with a guide element (17) on a guide rail (9) oriented approximately vertically in a vertical axis direction and is held in height-adjustable fashion by means of a traction cable (10). According to the invention, a traction force measuring device (22; 25) is provided for directly and/or indirectly measuring the traction force on the traction cable (10) in accordance with a cable tension, such that, by means of the traction force measuring device (22; 25), in the case of a preferably controlled height adjustment of the agitator (8), varying traction force measurement signals are generated in accordance with varying traction forces and are supplied to an evaluation device (20).

Methods and systems to control flexible gas fermentation platforms for improved conversion of CO.sub.2 into products is developed and particularly relates to a control process and system to control a ratio of feedstock gases and maximize the concentration of inert components in a bioreactor tail gas stream and or bioreactor headspace. Improved carbon utilization results though providing the most beneficial ratio of substrates to the bioreactor of the fermentation process.

The disclosure provides methods to improve the economics of the gas fermentation process. A fermentation process is integrated with an industrial or syngas process and an reverse water gas shift process. An intermittent supply of reverse water gas shift process feedstock from the reverse water gas shift process is provided to the bioreactor for fermentation. The reverse water gas shift process feedstock may supplement or partially displace the C1 feedstock from the industrial or syngas process. Whether the reverse water gas shift process feedstock supplements or displaces the C1 feedstock may be based upon a function of the cost per unit of the C1 feedstock, the cost per unit of the reverse water gas shift process feedstock, and the value per unit of the fermentation product, or may depend upon the target gas ratio of the feedstock to the gas fermentation process.

An integrated process and system for the production of at least one gas fermentation product from a gaseous stream has been developed. The disclosure provides improved carbon utilization through both the recycle of a bioreactor tail gas via various different flow schemes and the employment of a CO.sub.2 to CO conversion system such as a reverse water gas shift unit. Recycling of the bioreactor tail gas and employment of a CO.sub.2 to CO conversion process provides for favourable H.sub.2:CO molar ratios of the feed to the gas fermentation bioreactor(s) for enhanced production of fermentation products. Bypass embodiments provide for optimal sizing of the reverse water gas shift unit to minimize cost.

A system of controllable separation between recyclable organic waste and graywater sewage is described; a respective method for controllable separating recyclable organic waste from graywater sewage is further described; the system includes: a garbage disposal unit, and a separation module; the method includes: draining both the graywater sewage and the recyclable organic waste; processing the organic waste into a semiliquid mixture or slurry of round organic matter and fluid; discharging the semiliquid mixture or slurry of ground organic matter and fluid and the graywater sewage; and releasing the semiliquid mixture or slurry of ground organic matter and fluid; releasing the graywater sewage; and separating the semiliquid mixture or slurry of ground organic matter and fluid from the graywater sewage.

A method for treating an aqueous fluid comprising a biodegradable organic substance in an installation comprising an upflow bioreactor containing a sludge bed, said sludge bed comprising biomass, an external separator, and a conditioning tank, the method comprising: treating the fluid in the conditioning tank; feeding the treated fluid into a lower part of the bioreactor and forming biogas; withdrawing the fluid from an upper part of the bioreactor, which withdrawn fluid comprises biomass; feeding the aqueous fluid withdrawn from the upper part of the bioreactor into the external separator wherein the aqueous fluid comprising the biomass is separated into a liquid phase, and a fluid phase enriched in biomass; returning said fluid phase enriched in biomass from the external separator to the bioreactor; and returning a part of said liquid phase to the conditioning tank.

Methods for generating methane from animal waste by anaerobic digestion using bacteria. A screen separator removes suspended solids greater in size than a predetermined size ranging from about 50μ to about 150μ. An electrocoagulation unit electrochemically hydrolyses the waste, causing particles to settle out. A dissolved carbon air flotation has a CO.sub.2 bubbler for separating large particles from small particles by flotation. An anaerobic digester produces biogas. The digester has a biocurtain for growing the bacteria and a heat exchanger for heating the bacteria. The biocurtain surface is convoluted to retain the bacteria. A membrane module removes CO.sub.2. A knock out pot for removes droplets of water. A scrubber removes water vapor, particulates, and contaminant gas. A compressor boosts pressure. A gas chromatograph monitors the biogas composition. A flare skid lowers excess pressure for safety. Biogas is injected into a local pipeline system. A process control is used for controlling the anaerobic waste digestion system.

An integrated process and system for employing low conversion rWGS to prepare a gas fermentation feed stream from a CO.sub.2 source and a hydrogen source in order to produce at least one gas fermentation product. Low conversion rWGS reactors may (1) employ a wider selection of inorganic catalysts then rWGS reactors requiring high temperature operation, (2) allow for use of an electric heater instead of a fired heater to preheat feed stream to the low conversion rWGS reactor, and (3) extend rWGS catalyst life by reducing the amount of water produced in the rWGS reaction.