Waste Management & Water Pollution

* Carbon fibres are highly valued for their unique properties like strength, lightness, and stiffness. They are widely used in the manufacturing of various components in automobiles and aircraft to reduce weight and improve performance.  * Carbon Fiber Recycling: While traditional carbon fibre recycling methods were limited, advancements are being made in this field. Here are some possibilities  1. Mechanical recycling - This process breaks down carbon fibres into smaller pieces for use in applications where their original form is not necessary.  2. Chemical recycling -This method dissolves the resin holding the fibres together, potentially allowing the extraction of reusable carbon fibres.  3. Thermal recycling - High temperatures are used to convert the resin into usable materials while recovering the carbon fibres.  * These recycling technologies are still evolving, but they offer a more sustainable approach to using carbon fibres. Hence, statement 2 is incorrect.

Out of the listed functions of wetlands, the one that best reflects the analogy of "kidneys" is option D. Kidneys in our body function as a filtering system, removing waste products and excess fluids from the blood.
Wetlands with their dense vegetation and saturated soils, wetlands act as natural filters for water. Aquatic plants and microbes in wetlands play a crucial role in
- Phytoremediation: Aquatic plants can absorb and accumulate heavy metals and other pollutants from water.
- Nutrient cycling: Wetlands help regulate nutrient levels in water by absorbing excess nutrients like nitrogen and phosphorus. This prevents them from flowing into rivers, lakes, and oceans and causing harmful algal blooms. By filtering pollutants and excess nutrients, wetlands help purify water and maintain healthy aquatic ecosystems. This aligns with the concept of kidneys filtering waste from our blood.

Statement 1 is correct. PET fibres can be blended with cotton or wool to improve properties like wrinkle resistance and durability. Statement 2 is incorrect. Not all PET containers are suitable for all alcoholic beverages. Some PET can leach chemicals at high temperatures or with certain types of alcohol. It's important to check for specific suitability indicators on the packaging. Statement 3 is correct. PET bottles are one of the most commonly recycled plastics. They can be reprocessed into various products like clothing fibres, new bottles, or building materials. Statement 4 is incorrect. Incineration of PET, like most plastics, generates greenhouse gas emissions, including carbon dioxide. While PET has a lower emission profile compared to some other plastics, it's still not a zero-emission disposal method. Remember: Statements like store any kind of alcoholic beverages are vague & ambiguous, so they ought to be eliminated. Also, incineration of any substance cannot be environment friendly as it would definitely release GHGs. Hence the only Option left is Option A.
Therefore, the correct statements are 1 and 3.

Statement 1 is correct: Permaculture farming indeed discourages monocultural practices, promoting biodiversity and the efficient use of available resources. On the other hand, conventional chemical farming often involves monoculture practices. Statement 2 is correct: Conventional chemical farming can lead to an increase in soil salinity due to the heavy use of synthetic fertilizers and pesticides, while permaculture farming promotes soil health and does not contribute to soil salinity. Statement 3 is incorrect: The statement about conventional chemical farming being easily possible in semi-arid regions but permaculture farming not being so easily possible in such regions is not necessarily true. Permaculture farming can be adapted to various climates and environments, including semi-arid regions, by using appropriate design principles and techniques. Statement 4 is correct: The practice of mulching, which involves covering the soil with organic material to conserve moisture, suppress weeds, and improve soil health, is an important aspect of permaculture farming, but it is not necessarily a key practice in conventional chemical farming.

Triclosan (sometimes abbreviated as TCS) is an antibacterial and antifungal agent present in some consumer products, including
- toothpaste,
- soaps,
- detergents,
- toys,
- surgical cleaning treatments.

* The R2 Code of Practices is a tool available for promoting the adoption of environmentally responsible practices in the electronics recycling industry. * R2 stands for Responsible Recycling.
The Code of Practices outlines a set of standards that electronics recyclers should follow to ensure responsible handling of electronic waste.

Statement 1 is Incorrect: While some carbon monoxide might be produced during the smelting process, it's unlikely to be in lethal quantities with proper emission controls. Statement 2 is Correct: Copper slag, a byproduct of the smelting process, can contain heavy metals like lead, arsenic, and cadmium. Rainwater or acidic runoff can leach these metals from the slag, contaminating soil and water resources. Statement 3 is Correct: Sulphur dioxide (SO2) is a major pollutant released during copper smelting, primarily from the burning of sulfur-containing fossil fuels used in the process. SO2 emissions contribute to acid rain and air pollution.

Statement 1 is correct: Coal ash, a by-product of coal combustion in power plants, contains various heavy metals including arsenic, lead, and mercury. These metals can pose environmental and health hazards. These toxic elements can leach into water bodies and contaminate soil. Statement 2 is correct: The combustion of coal in power plants releases releases sulfur dioxide (SO₂), which contributes to acid rain and respiratory issues. It also emits oxides of nitrogen (NOₓ), which play a major role in smog formation and air pollution. Statement 3 is correct: Indian coal, particularly the variety found in the eastern and central regions, is known for its high ash content (30-50%), which reduces its calorific value and increases pollution levels.Due to its high ash content, Indian thermal power plants generate large quantities of fly ash. Therefore, all three statements are correct.

Steel slag can be used for several purposes, and all of the options listed are valid applications. Statement 1 is correct. Steel slag is a common and cost-effective material for use in road base construction due to its high durability, strength, and drainage properties. Statement 2 is correct. Crushed steel slag can be used as an amendment for agricultural soil. It can improve drainage, provide some essential nutrients, and even help suppress weeds. Statement 3 is correct. Steel slag can be partially substituted for some raw materials in cement production, reducing the need for quarrying and lowering the environmental impact of cement manufacturing. Therefore, the correct answer is 1, 2, and 3.

* Solid Waste Management Rules, 2016 mandate the segregation of waste into three categories - biodegradables, dry recyclables (plastic, paper, metal, etc.), and domestic hazardous waste (diapers, napkins, etc.). * The SWM Rules, 2016 apply not just to urban areas but also to urban local bodies, notified areas, census towns, all industrial townships, special economic zones, State and Central government organisations, places of pilgrimage, religious and historical importance. * There is no restriction on moving waste from one district to another. Waste generators can transport waste as needed for disposal, treatment, or processing. * Waste processing facilities will have to be set up by all local bodies having a population of 1 million or more within two years. * For census towns with a population below 1 million or all local bodies having a population of 0.5 million or more, common, or stand-alone sanitary landfills will have to be set up in three years. * Also, common, or regional sanitary landfills to be set up by all local bodies and census towns with a population under 0.5 million will have to be completed in three years.