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Extra info for Advances in Biogas
Alternatively, the heat can be introduced through the reactor walls, a process known as pyrolytic gasification. The gases in this process are not diluted by nitrogen contained in the air, although they can be contaminated with trace amounts of char and tar. , which can also include other organic fractions, such as small pieces of garden trimmings, non-recyclable papers and nappies. The residue that remains after source separation is known as grey waste. Source separation provides the best quality feedstock for either composting or AD, with a minimum of heavy metal and plastic contamination.
In addition, a floor price for biogas producers will be set to protect them from the ups and downs in the energy market. The passage of the bill has been helped by the growing understanding that biogas can potentially be pumped directly into the natural gas pipeline infrastructure, as well as its ability to capture methane emissions that are 21 times more potent than those from carbon dioxide. In fact, anaerobic digestion can prevent methane from entering the atmosphere and generate carbon offset credits that can then be traded under a greenhouse gas cap-andtrade system.
Gas turbines allow a greater fraction of waste heat to be recovered as steam, a critical commodity for many industries, so overall efficiency levels for gas turbines can be up to 75%. In addition, in many countries biogas is viewed as an environmentally attractive alternative to diesel and petrol for operating buses and other local transport vehicles. Noise levels generated by methane-powered engines are considerably lower than those of diesel engines, a plus in congested urban environments. Exhaust fume emissions are also much lower than those from diesel engines, and nitrogen oxide emissions are very low.