Context: Private textiles manufacturers in India are looking forward to replacing coal as the raw material used in manufacturing processes with biofuel. However, this requires a reliable supply-chain of biofuel, to substitute coal.
Relevance of the Topic: Prelims & Mains: Biofuels: Sources, Types, Advantages.
Biofuels
- Biofuel is any fuel that is derived from organic sources such as biomass and organic waste (plant or algae material or animal waste).
- It is considered to be a source of renewable energy (as such feedstock material can be replenished readily), unlike fossil fuels such as petroleum, coal, and natural gas.
Sources of Biofuels
- First-generation biofuels: Consists of fuels obtained from food crops (corn, wheat, soybeans, sugarcane). E.g., Biofuels created from vegetable oils, such as bioethanol and biodiesel.
- Second-generation biofuels: Fuels that come from organic wastes (agri-food and forestry industries), used cooking oils and the organic matter from urban wastes. E.g., Renewable diesel (HVO), sustainable aviation fuel (SAF), biogas, and biomethane.
- Third-generation biofuels: Fuels extracted from algae and aquatic plants with a natural oil content of at least 50%.
- Fourth-generation biofuels: Fuel sought to be extracted from genetically modified microorganisms to improve the efficiency of CO₂ Capture and Storage.
Types of Biofuels:
- Bioethanol:
- Obtained through the fermentation of materials rich in sugars or starches, such as corn, sugar cane, sugar beet etc. This process converts the sugars present in these materials into ethanol.
- Bioethanol is widely used as an additive in petrol to increase octane number, and bring down carbon monoxide and other toxic emissions.
- Biodiesel:
- Fuel made from vegetable oil, recycled cooking oil, soybean, palm oil, peanut oil, animal fat, and fatty acids, through a process of conversion is known as Transesterification.
- The energy content in Biodiesel is about 90% that of petroleum diesel. Compared to petroleum-based diesel, Biodiesel burns cleaner and eliminates sulfur dioxide emissions.
- Bio-gas:
- Bio-gas is a blend of gases such as methane (main component), carbon dioxide, and hydrogen sulfide.
- Biogas is produced from anaerobic breakdown of biomass (raw materials such as manure, green waste, food waste, agricultural waste). It burns just like natural gas.
- Bio-hydrogen:
- Biohydrogen is typically produced through fermentation of organic materials such as agricultural waste or algae, bacteria, and achaea.
- Some of the common methods of developing biohydrogen are photo fermentation, dark fermentation, direct photolysis, and indirect photolysis.
- Aviation Biofuel:
- Sustainable aviation fuel (SAF) is an alternative fuel to fossil-based jet fuel. SAF can be made from renewable and waste-based sources such as used cooking oil, municipal and agricultural waste.
- It has the potential to reduce lifecycle emissions by up to 80% (when used neat) compared with conventional aviation fuel. SAF can also be blended with conventional aviation fuel.
Advantages of Biofuels:
- Lesser Greenhouse emissions: Biofuels emit fewer greenhouse gases compared to fossil fuels.
- Circular Economy: Use of organic wastes for fuel production favours the reuse of resources and reduces the arrival of waste at landfills.
- Energy Security: Using biofuels can increase energy security by diversifying energy supply. By blending biofuels with conventional fuels, it can reduce import dependence on fossil fuels and save forex reserves.
- Economic Opportunity: Domestic or localised production and use of biofuels can create new jobs in a variety of industries, including agriculture, engineering, and transportation etc.
Limitations:
- Food Security: Biofuel crops competing with food crops for land and water raises concerns about food security.
- Land Use Issues: Cultivating crops for biofuel often requires large areas of land, leading to concerns like deforestation and habitat destruction.
- High Cost: Producing biofuels requires substantial investment in infrastructure and technology. As a result, biofuels tend to be more expensive than traditional fossil fuels, limiting access for consumers.
- Unintended consequences: Biofuels production sourced from previously forested land or converted land can release carbon stored in soil and vegetation.
- Supply-chain limitations: Limited-supply chains in India limits the scalability of biofuels.
Government Initiatives for Biofuel Production
- National Policy on Biofuels (2018):
- The National Policy on Biofuels - 2018 was notified by the Ministry of Petroleum and Natural Gas to promote the production of biofuels.
- The policy was amended in 2022 to advance the target of 20% blending of ethanol in petrol to 2025-26 from 2030.
- PM JI-VAN Yojana:
- In 2019, the Government launched Pradhan Mantri JI-VAN (Jaiv Indhan- Vatavaran Anukool fasal awashesh Nivaran) Yojana.
- Aim: To provide financial support to integrated bio-ethanol projects for setting up Second Generation (2G) ethanol projects using ligno-cellulosic biomass and other renewable feedstocks.
The diverse range of biofuels offers promising alternatives to traditional fossil fuels. Their renewable nature reduces carbon footprint, and their potential for sustainable energy makes them pivotal in our transition towards a clean environment.