Biofuels are fuels that derive from any plant or animal material – known as biomass – and include wood, charcoal and animal waste, all of which when processed are traditionally used for energy production by those in rural areas or in extreme poverty. Biofuel may also come from agricultural crops, or it may be derived from forestry, agricultural or fishery products or municipal waste, as well as from agro-industry, food industry and food service by-products.
Figure 6.11 Schematic of a concentrated solar thermal trough power plant
Source: Volker Quaschning, Germany, www.volker-quaschning.de
It is possible to sub-divide biofuels into those ...