Biomass Energy

Collection of trees and shrubs that has not been harvested for timber or other uses in about 200 years, although definitions vary. Energy resources that are exhaustible relative to the human life span, such as gas, coal, or petroleum. Gas in the atmosphere, such as carbon dioxide, methane, water vapor, and ozone, that absorbs solar heat reflected by the surface of the Earth, warming the atmosphere.

However, the establishment and cultivation of bioenergy crops can displace natural ecosystems, degrade soils, and consume water resources and synthetic fertilisers. Renewable natural gas—also called biogas or biomethane—is produced in anaerobic digesters at sewage treatment plants and at dairy and livestock operations. A chemical conversion process known as transesterification is used for converting vegetable oils, animal fats, and greases into fatty acid methyl esters (FAME), which are used to produce biodiesel. Hydrotreating is used to process bio-oil (produced by fast pyrolysis) with hydrogen under elevated temperatures and pressures in the presence of a catalyst to produce renewable diesel, renewable gasoline, and renewable jet fuel. Had the residues not been collected and used for bioenergy, they would have decayed (and therefore produced emissions)g on the forest floor or in landfills, or been burnt (and produced emissions) at the side of the road in forests or outside wood processing facilities.

Because of the varied climate mitigation potential for different biofuel pathways, governments and organizations set up different certification schemes to ensure that biomass use is sustainable, for instance the RED (Renewable Energy Directive) in the EU and the ISO standard by the International Organization for Standardization. When this is the case, more of the wood’s inherent energy must be spent solely on evaporating moisture, compared to the drier coal, which means that the amount of CO2 emitted per unit produced heat will be higher. When this is the case, more of the wood’s inherent energy must be spent solely on evaporating moisture, compared to the drier coal, which means that the amount of CO2 emitted per unit of produced heat will be higher. The alternative scenarios range from scenarios with only modest changes compared to the existing project, all the way to radically different ones (i.e. forest protection or “no-bioenergy” counterfactuals.) Generally, the difference between scenarios is seen as the actual carbon mitigation potential of the scenarios.

The energy content in agricultural residues used for energy is approximately 2 EJ.p However, agricultural residues has a large untapped potential. The by-products from the wood processing industry are called wood processing residues and consist of cut offs, shavings, sawdust, bark, and black liquor. Residues and waste are by-products from biological material harvested mainly for non-energy purposes. Biofuel made from food crops harvested for energy is also known as “first-generation” or “traditional” biofuel and has relatively low emission savings. Some people use the terms biomass and biofuel interchangeably, but it is now more common to consider biofuel to be a liquid or gaseous fuel used for https://www.mlb4s.com/top-12-most-commonly-used-iot-protocols-and-standards.html?noamp=mobile transportation, as defined by government authorities in the US and EU.ab From that perspective, biofuel is a subset of biomass. Biomass (in the context of energy generation) is matter from recently living (but now dead) organisms which is used for bioenergy production.

• Likewise, if total absorption is higher than total emissions, the project is carbon negative.
• For example, harvesting trees may remove important habitats and food supplies on which wildlife depend.
• If trees and crops are sustainably farmed, they can offset carbon emissions when they absorb carbon dioxide through respiration.
• Those emissions can be significantly offset if the trees that were harvested are replaced by new trees in a well-managed forest, as the new trees will remove carbon dioxide from the air as they grow.

Transportation Energy

If you’re short on time, start by watching this video of key highlights from our Biomass lecture. Most exports go to Europe and come mainly from forests in the Southeast U.S. Eighty-eight percent (8.8 million tonnes/year) of the U.S.’s wood pellet manufacturing capacity is in the South, mainly in North Carolina and Georgia. In 2025, it http://mycosesstudygroup.org/educatio/EventDetails.pl?slno=390 exported 8.5 million tonnes (about a quarter of total global wood pellet exports).

The global production of bioethanol and biodiesel provides 2.2 and 1.5 EJ of energy per year, respectively. The United States is the largest producer of bioethanol, while the European Union is the largest producer of biodiesel. Sugar- and starch-producing crops are used to make bioethanol, and oil-producing crops are used to make biodiesel. Food crops harvested for energy include sugar-producing crops (such as sugarcane), starch-producing crops (such as maize), and oil-producing crops (such as rapeseed).

Other plants can also be used as fuel, for instance maize, switchgrass, miscanthus and bamboo.

Another disadvantage is that biomass has a lower “energy density” than fossil fuels. This means that land used for biofuel crops, such as corn and soybeans, is unavailable to grow food or provide natural habitats. This is still a much, much shorter time period than it takes to form fossil fuel sources such as peat, the precursor to coal. A forest, for instance, can take well over 100 years to re-establish itself. Many biomass feedstocks, such as switchgrass (Panicum virgatum), can be harvested on marginal lands or pastures, where they do not compete with food crops. However, researchers also believe https://planete-typoraphie.com/2021/12 this issue can be mitigated with further research and development.

Thermal conversion

Biodiesel is made by combining an alcohol (methanol or ethanol) with animal fat, recycled cooking fat or vegetable oil. Biomass can be burned to create heat (direct), converted into electricity (direct) or processed into biofuel that can be used as an energy source later (indirect). Biomass is organic, meaning it is made of material that comes from living organisms, such as plants and animals. International energy information, including overviews, rankings, data, and analyses.

However, the farming of biomass feedstocks can reduce biodiversity, degrade soils and take land out of food production. Bioenergy from waste has experienced significant growth in Asia, especially in China, over the last decade. However, using waste streams for bioenergy can reduce climate and environmental impacts. Biomass contains stored chemical energy from the sun that plants produce through photosynthesis. Mimicking the petroleum refinery model, integrated biorefineries can produce bioproducts alongside biofuels.