Disclosed is an adsorbent containing a metal oxide for adsorption of hydrogen sulfide in biogas, and a biogas purification system using the same.

The disclosure provides for the separation and combustion of at least one hydrocarbon, oxygenate, sulfur compound, and or nitrogen compound, from industrial gas or gasification derived syngas to generate steam. A gasification process and a gas fermentation process may be integrated using tail gas from the fermentation process for the flame to combust tar and other compounds from the syngas generated by a gasification process. Integration may be achieved by removing tar and other compounds from industrial gas or gasification derived syngas using an adsorbent and regenerating the adsorbent using tail gas from the gas fermentation process. Tail gas enriched with the desorbed tar and other compounds may be used to generate steam in a steam boiler and the steam may be used for a variety of purposes including power generation to power, for example, a compressor of the gas fermentation process.

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 present invention relates to an anaerobic process for biogas upgrading and hydrogen utilization comprising the use of acidic waste as co-substrate. In this process, H.sub.2 and CO.sub.2 will be converted to CH.sub.4, which will result in lower CO.sub.2 content in the biogas. The invention relates to both in situ and ex situ methods of biogas upgrading. The invention further relates to a bioreactor comprising hollow fiber membranes.

An anaerobic digestion device based on self-sustained air flotation includes an anaerobic digestion tank unit, a self-sustained air flotation screening unit and a biogas measurement and collection unit. The self-sustained air flotation screening unit includes an air flotation screening part, a material sedimentation part, a reflux part and a three-phase separation part connected sequentially from bottom to top. A digested material in the anaerobic digestion tank unit is pumped into the air flotation screening part, overflows into the material sedimentation part, and then is raised to the reflux part. Gas passing through the three-phase separation part and gas produced in the anaerobic digestion tank unit enter the biogas measurement and collection unit to be measured and collected.

Waste gas mixtures produced and used in industry may contain harmful sulphurous compounds. The present disclosure provides a method for treatment of gas mixtures contaminated with harmful sulphurous compounds by using microorganisms capable of degrading said harmful sulphurous compounds which involves controlling nitrate levels in the medium in which microbiological conversion of harmful sulphurous compounds takes place at high levels.

Systems and methods provide a self-contained sealed apparatus that captures, filters, compresses and stores methane gas produced by the decomposition of bio-degradable organic materials. The system includes a rotatable and sealable chamber with an intermittent drive unit that mixes moist bio-degradable material during an anaerobic reaction, and captures methane gas generated by anaerobic decomposition. A filter to remove impurities, a low-pressure storage tank, a compressor and a high-pressure storage tank are interconnected and controlled by a system that monitors system parameters, that may include gas flow rate, temperature, and gas volume, and controls system parameters, that may include drive unit activation, generator operation, and compressor operation.

The invention provides a process for producing a fermentable gas stream from a gas source that contains one or more constituent which may be harmful to the fermentation process. To produce the fermentable gas stream, the gas stream is passed through a specifically ordered series of removal modules. The removal modules remove and/or convert various constituents found in the gas stream which may have harmful effects on downstream removal modules and/or inhibitory effects on downstream gas fermenting microorganisms. At least a portion of the fermentable gas stream is preferably capable of being passed to a bioreactor, which contains gas fermenting microorganisms, without inhibiting the fermentation process.

A mixed gas generated in a methane fermentation tank is supplied to culture tanks. In the culture tanks, water as a culture solution is held and algae are cultured. Carbon dioxide contained in the mixed gas preferentially dissolves in water. That is, carbon dioxide is removed from the mixed gas. As a result, a concentration of methane, which is one component of the mixed gas, increases. The mixed gas is re-supplied to another culture tank or the same culture tank.

The present disclosure relates to biomanufacturing systems for producing an organic product. The present disclosure relates to recombinant microorganisms having an improved organic substrate producing ability, and to recombinant microorganisms having an improved organic product producing ability. A benefit of the systems and recombinant microorganisms disclosed herein can include an ability to separately produce an organic product and an organic substrate that generates a culture impurity during its production. The present disclosure relates to methods of producing an organic product using biomanufacturing systems and recombinant microorganisms disclosed herein.