Biogas is a renewable energy source that can be used to generate electricity and heat. It is produced by the anaerobic digestion of organic matter, such as agricultural waste, manure, and sewage sludge. The process of anaerobic digestion produces a mixture of gases, primarily methane and carbon dioxide. Carbon dioxide removal from biogas can be achieved through a variety of methods, including chemical scrubbing, membrane separation, and cryogenic separation. Chemical scrubbing involves passing the biogas through a scrubber containing a chemical solution. The scrubber removes impurities from the biogas, such as hydrogen sulfide, carbon dioxide, and other compounds. The chemical solution used in the scrubber is typically an alkaline solution, such as sodium hydroxide or potassium hydroxide. The scrubbed biogas is then ready for use as fuel.
What is the difference between carbon dioxide remediation and removal in biogas? Both are processes that change the raw biogas to another useful form, but there is a distinction. Carbon dioxide removal is a form of remediation, but it is a more sophisticated and costly step in the “cleanup” of biogas. Normally, the reason to remove the carbon dioxide is to prepare it for injection into a pipeline or prepare it for vehicle use, like in trucks, buses, or taxis, that are converting to burn the pure methane. This process includes membrane separation, pressure swing absorption (PSA), and chemical scrubbing. On the other hand, basic remediation involves contaminate removal, as in fixed media vessels to remove the hydrogen sulfide and siloxanes. Post-treatment from these processes is usually chilling and re-heating to remove the moisture.
While most processes that remove the carbon dioxide certainly do affect the other contaminates, this is not necessarily to the level required for pipeline injection. Each end-user has its own limitations on what is combined with methane, even including moisture.
A general rule of thumb would be that biogas remediation is typically far less costly than also removing carbon dioxide. In fact, many turbine companies and engine companies prefer carbon dioxide to be in their fuel, as their units run at a lower temperature than on pure methane, thus less high-temperature issues. Remediation versus removal is a decision for experts based on many factors.
With over 150 experts worldwide, Lee Enterprises Consulting has experts in many specific clean and renewable areas, including anaerobic digestion, fermentation, biomass, conversion technologies for things like tires and railroad ties, organic synthesis, fuel additives, ethanol gas, biodiesel fuel including algae biofuels, solid state and industrial fermentation, green energy grants, ag biotech, agricultural waste, alcohol fuels, alternative proteins and animal-free products, sustainable foods, beverage fermentation, biocatalysis, biodiesel conversion, biogas production, biomass power, carbon intensity, co2 utilization, combined heat & power, Fischer-Tropsch technology, food waste, hydrothermal carbonization, industrial enzymes, landfill management, microbial fermentation, organic synthesis, plastic pyrolysis, plastic recycling, plastic waste, pyrolysis oil, reactor design, renewable identification number, the Renewable Fuel Standard (rfs2), solid recovered fuels, torrefaction and torrefied biomass, waste to energy, and waste-to-hydrogen. This is a multidisciplinary group of green energy consultants that is a virtual “one-stop shop” for any client need and handles projects of all types and sizes.
For more than 25 years, Lee Enterprises Consulting has been at the forefront of the bioeconomy. Our highly differentiated market position centers around our deep subject matter expertise in very specialized areas. We help clients minimize technical and economic risk by leveraging best practices in our industries, and we have a long track record of providing insightful analysis and practical advice. Our reputation is unparalleled because we provide a simpliﬁed process, with a single point of contact to a diverse international network of proven experts in biofuels, biomaterials, feedstocks, alternative proteins, and existing & emerging technologies. Providing access to these world-renowned bioeconomy experts allows us to create tailored solutions to meet each project’s individual needs. Please take a look at our experts and the services we provide. Call us at 1+ (501) 833-8511 or email us for further information.