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Biogas
Biogas is a gaseous renewable energy source[1] produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste, wastewater, and food waste. Biogas is produced by anaerobic digestion with anaerobic organisms or methanogens inside an anaerobic digester, biodigester or a bioreactor.[2] The gas composition is primarily methane (CH
4) and carbon dioxide (CO
2) and may have small amounts of hydrogen sulfide (H
2S), moisture and siloxanes. The methane can be combusted or oxidized with oxygen. This energy release allows biogas to be used as a fuel; it can be used in fuel cells and for heating purpose, such as in cooking. It can also be used in a gas engine to convert the energy in the gas into electricity and heat.[3]
After removal of carbon dioxide and hydrogen sulfide it can be compressed in the same way as natural gas and used to power motor vehicles. In the United Kingdom, for example, biogas is estimated to have the potential to replace around 17% of vehicle fuel.[4] It qualifies for renewable energy subsidies in some parts of the world. Biogas can be cleaned and upgraded to natural gas standards, when it becomes bio-methane. Biogas is considered to be a renewable resource because its production-and-use cycle is continuous, and it generates no net carbon dioxide. From a carbon perspective, as much carbon dioxide is absorbed from the atmosphere in the growth of the primary bio-resource as is released, when the material is ultimately converted to energy.
Scarborough (/ˈskɑːrbrə/) is a seaside town in the district and county of North Yorkshire, England. With a population of 61,749, Scarborough is the largest town on the Yorkshire Coast and the fourth-largest settlement in the county.
It is located on the North Sea coastline. Historically in the North Riding of Yorkshire, the town lies between 10 and 230 feet (3–70 m) above sea level, from the harbour rising steeply north and west towards limestone cliffs. The older part of the town lies around the harbour and is protected by a rocky headland which extends into the North Sea.
The town has fishing and service industries, including a growing digital and creative economy, as well as being a tourist destination. Residents of the town are known as Scarborians.
