DAILY CURRENT AFFAIRS IAS | UPSC Prelims and Mains Exam – 9th October 2024
Archives (PRELIMS & MAINS Focus) WASTE-TO-ENERGY Syllabus Prelims & Mains – SCIENCE & TECHNOLOGY Context: Big cities are yet to clear any land in half of their legacy landfill sites, with only 38% of the total dumped waste being remediated so far. It underscores the need for more effective strategies and resources to overcome the obstacles in waste remediation, and draws attention to the significance of waste-to-energy technologies. Background: – While waste remediation involves processes that clean up and rehabilitate contaminated land, waste-to-energy technologies convert non-recyclable waste materials into usable forms of energy, such as electricity or heat. Traditional to Modern Waste Management: Key Insights The Industrial Revolution (mid-18th century) marked the beginning of large-scale waste generation due to industrial production. Traditional waste management involved direct disposal into landfills, oceans, or remote areas, which is now unsustainable due to environmental impacts. Definition of Waste: According to the UN Statistical Division, waste refers to materials that are no longer useful for production, transformation, or consumption and are meant for disposal. Global Waste Generation: Currently, global waste production is 1.3 billion tonnes annually and is projected to rise to 2.2 billion tonnes by 2025, making waste management a critical global concern. Waste-to-Energy Technologies: Waste-to-energy technologies serve two purposes: (a) managing large-scale waste generated from household, municipal and industrial activities and, (b) meeting the rising energy demands. Simply put, ‘waste-to-energy refers to a series of technologies that convert non-recyclable waste into some usable forms of energy’. They align with UN SDG 7 (Affordable and Clean Energy) and SDG 11 (Sustainable Cities and Communities) and promote the circular economy. Conversion Processes: Thermochemical Technologies: Include incineration, pyrolysis, and gasification for energy recovery from waste. Incineration: Common method for treating heterogeneous waste by burning it at high temperatures in a specific kind of furnace called incinerators. This technique is appropriate for wastes with high caloric value as well as for non-hazardous municipal waste. Pyrolysis: Breaks down waste without oxygen to produce fuels (char, pyrolysis oil, syngas). It is an old technology that was used to produce charcoal from wood. Gasification: Decomposes carbon-rich waste to produce syngas. Pyrolysis and gasification are better suited for homogenous waste types. Biochemical Technologies: Use biological processes for organic waste (kitchen/garden). Anaerobic Digestion: is appropriate for organic waste where micro-organisms break down material in the absence of oxygen. One of the end-products is biogas. This method can occur naturally or can be engineered in bio-digesters and sanitary landfills. Landfilling: Composting and landfilling involve burying of waste accompanied by deploying landfill gas recovery systems. Although landfilling is less expensive, it is environmentally detrimental due to the release of toxic and obnoxious gases. Waste-to-Energy in India: The first plant was established in Delhi in 1987. As of 2022, India has 12 operational plants. Despite policies from the Ministry of New and Renewable Energy, power generation from waste remains minimal, at just 554 MW (0.1% of total energy generated). There is a perception that waste-to-energy plants have failed in India. Commonly cited reasons are administrative delays in getting approval as well local opposition This happened in the case of the Bandhwari plant proposed in Gurugram in Haryana in 2021. Other reasons include extremely heterogeneous, unsegregated and poor quality of waste which requires excessive pre-treatment and increases the fuel requirement making the entire process expensive and unviable. Global best practices (e.g., Denmark’s hedonistic sustainability) could be adapted in India. Source: Indian Express AMAZON RIVER Syllabus Prelims – GEOGRAPHY Context: The Amazon River, battered by back-to-back droughts fueled by climate change, is drying up, with some stretches of the mighty waterway dwindling to shallow pools only a few feet deep. Background: – Water levels along several sections of the Amazon River, fell last month to their lowest level on record, according to figures from the Brazilian Geological Service. About Amazon river The Amazon River, located in South America, is the second longest river in the world, after the Nile, with a length of approximately 6,400 kilometers. It flows through Peru, Colombia, and primarily Brazil, discharging into the Atlantic Ocean. The Amazon Basin, the largest drainage basin in the world, covers about 7 million square kilometers, accounting for nearly 40% of South America’s landmass. The extensive lowland areas bordering the main river and its tributaries, called várzeas (“floodplains”), are subject to annual flooding, with consequent soil enrichment; however, most of the vast basin consists of upland, well above the inundations and known as terra firme. More than two-thirds of the basin is covered by an immense rainforest, which grades into dry forest and savanna on the higher northern and southern margins and into montane forest in the Andes to the west. Hydrological Significance: The Amazon carries more water than any other river on Earth, accounting for approximately 20% of the world’s fresh river water. It has the largest discharge of any river, with an average flow of about 209,000 cubic meters per second. The river is fed by over 1,000 tributaries, with the Rio Negro, Madeira, and Tapajós being the largest. Biodiversity: The Amazon River and its surrounding rainforest support one of the most biodiverse ecosystems in the world. It is home to a variety of species including the Amazon river dolphin (Boto), piranhas, electric eels, and more than 2,500 fish species. The Amazon rainforest, nourished by the river, houses around 10% of all known species, playing a crucial role in global biodiversity. Source: NewYork Times ARTIFICIAL NEURAL NETWORKS Syllabus Prelims & Mains – SCIENCE & TECHNOLOGY Context: On October 8, John Hopfield and Geoffrey Hinton won the 2024 Nobel Prize for physics for foundational discoveries and inventions that enable machine learning with artificial neural networks. Background: – Their work lies at the roots of a large tree of work, the newest branches of which we see today as artificially intelligent (AI) apps like ChatGPT. What are Artificial Neural Networks (ANNs)? Artificial Neural Networks (ANNs) are computational models inspired by the human brain’s neural networks. They are composed of layers of interconnected artificial neurons that process data in a way that mimics human learning. ANNs are the foundation
DAILY CURRENT AFFAIRS IAS | UPSC Prelims and Mains Exam – 9th October 2024 Read More »
