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Subject: Environment

  • What is Biochar?

    A new research has shown that Biochar application is more effective in promoting pulses growth and yield in Ghana.

    Try this PYQ:

     

    Q.In the context of which one of the following are the terms ‘pyrolysis and plasma gasification’ mentioned? (CSP 2019)

    (a) Extraction of rare earth elements

    (b) Natural gas extraction technologies

    (c) Hydrogen fuel-based automobiles

    (d) Waste-to-energy technologies

    What is Biochar?

    • Biochar is a high-carbon, fine-grained residue that is currently produced through modern pyrolysis processes (direct thermal decomposition of biomass in the absence of oxygen and preventing combustion).
    • It produces a mixture of solids (the biochar proper), liquid (bio-oil), and gas (syngas) products.
    • Biochar may increase soil fertility of acidic soils (low pH soils), increase agricultural productivity, and provide protection against some foliar and soil-borne diseases.

    Its benefits

    • Carbon Sink: The burning and natural decomposition of biomass releases large amounts of carbon dioxide and methane to the Earth’s atmosphere. The biochar production process also releases CO2 (up to 50% of the biomass); however the remaining carbon content is stable indefinitely.
    • Soil Amendment: Biochar is recognized as offering a number of soil health benefits. The extremely porous nature of biochar is found to be effective at retaining both water and water-soluble nutrients. Its presence in the earth can improve water quality, increase soil fertility, raise agricultural productivity, and reduce pressure on old-growth forests.
    • Water retention: Biochar is hygroscopic. Thus it is a desirable soil material in many locations due to its ability to attract and retain water.

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    Back2Basics

    What is Pyrolysis?

    • Pyrolysis is the thermal decomposition of materials at elevated temperatures in an inert atmosphere.
    • It involves a change in chemical composition. The word is coined from the Greek-derived elements pyro “fire” and lysis “separating”.
    • It is most commonly used in the treatment of organic materials. It is one of the processes involved in charring wood.
    • It is considered as the first step in the processes of gasification or combustion.

    How does it work?

    • In general, pyrolysis of organic substances produces volatile products and leaves a solid residue enriched in carbon, char.
    • Extreme pyrolysis, which leaves mostly carbon as the residue, is called carbonization.
    • The process is used heavily in the chemical industry, for example, to produce ethylene, many forms of carbon, and other chemicals from petroleum, coal, and even wood, to produce coke from coal.

  • BIS’ draft standard for drinking water supply

    The Bureau of Indian Standards (BIS) has prepared a draft standard for the supply system of piped drinking water.

    Try this question for mains:

    Q.Climate change, scarcity, population growth, demographic changes and urbanization pose challenges for water supply systems in India. Analyse.

    About the Draft

    • Labelled ‘Drinking water supply quality management system — requirements for piped drinking water supply service’, the draft has been prepared by the BIS’ Public Drinking Water Supply Services Sectional Committee.
    • It outlines the process of water supply, from raw water sources to household taps.
    • It has been developed keeping in view the Centre’s Jal Jeevan Mission for providing safe and adequate drinking water to all rural households by 2024 through tap connections.
    • It is expected to make the process of piped water supply more uniform, especially in rural and underdeveloped areas of the country where the system runs on various government orders and circulars.
    • At present, the standard is expected not to be made mandatory.

    Highlights of the draft

    • The draft outlines the requirements for a water supplier or a water utility on how they should establish, operate, maintain and improve their piped drinking water supply service.
    • The process begins with the identification of a water source, which can either be groundwater or surface water sources such as rivers, streams or reservoirs.
    • It doesn’t mention how water utilities should treat the water, but states that the process should be planned in such a manner that after treatment it should conform to the Indian Standard (IS) 10500 developed by the BIS.
    • The IS 10500 outlines the acceptable limits of heavy metals such as arsenic, and other parameters like the pH value of water, its turbidity, the total dissolved solids in it, and the colour and odour.

    What is the water supply process?

    • The supply system as outlined in the draft should begin with the identification of a raw water source.
    • Water should then be pumped into the treatment plant and treated to achieve acceptable drinking standards.
    • After the water is released from the plant, there should be reservoirs in the distribution system for storage of this water, and disinfection facilities to get rid of contamination at any stage of distribution.
    • Pumping stations or boosters, if necessary, should be provided to maintain adequate pressure throughout the distribution system.

    District Metering Area (DMA) concept

    • The document also states that the concept of district metering area (DMA) should be adopted where possible.
    • DMA is a concept for controlling leakages in the water network, which is essentially divided into a number of sectors, called the DMAs, and where flow meters are installed to detect leaks.
    • The water supplier/utility may provide bulk water meters in the water distribution system to ensure water audit, however, the provisions should be made for domestic meters also.

    What’s there in the draft in addition to the water supply process?

    • There are guidelines on water audit, which is a calculation of the amount of water put into distribution against the amount that is consumed.
    • The draft states that a water audit should be conducted on a quarterly basis.
    • Effort should be made by the water agency to bring down the water loss up to 15% of the total water supplied in the system.
    • The water utilities are also required to conduct surveys among consumers and obtain feedback on their service as per the draft.
    • Guidelines on internal audit, management review, documenting performance indicators for improvement, and timely action against non-conformity issues also find mention.

  • Gorumara National Park

    A bison (Indian Gaur) was allegedly poached in Gorumara National Park.

    Try this PYQ:

    Which one of the following National Parks lies completely in the temperate alpine zone?(CSP 2019)

    (a) Manas National Park

    (b) Namdapha National Park

    (c) Neora Valley National Park

    (d) Valley of Flowers National Park

    Gorumara NP

    • It is located in the Eastern Himalayas’ submontane Terai belt.
    • This region has rolling forests and riverine grasslands, and is known as the Dooars in West Bengal.
    • The park is located on the flood plains of the Murti River and Raidak River. The major river of the park is the Jaldhaka river, a tributary of the Brahmaputra river system.
    • In this regard, Gorumara is a significant watershed area between the Ganges and Brahmaputra river systems.
    • The park is rich in large herbivores including Indian rhinoceros, gaur, Asian elephant, sloth bear, chital, and sambar deer. Small herbivores include barking deer, hog deer and wild boar.

    About Gaur

    • The Gaur called the Indian bison, is native to South and Southeast Asia and has been listed as Vulnerable on the IUCN Red List since 1986.
    • It is the largest species among the wild cattle.
    • The domesticated form of the gaur is called gayal (Bos frontalis) or mithun.

  • Micro-plastic Pollution in Atlantic Ocean

    The Atlantic Ocean contains 12-21 million tonnes of microplastics — about 10 times higher than previously determined — according to new research published in Nature Communications.

    Highlights of the report

    • In the study, scientists studied pollution of the Atlantic Ocean caused by three types of plastics: polyethylene, polypropylene, and polystyrene, which were suspended in the top 200 metres of the ocean.
    • These three types of plastic are most commonly used for packaging.
    • Scientists say that pollution caused by microplastics has been “severely” underestimated in previous assessments.
    • They also estimate that based on plastic waste generation trends from 1950-2015 and considering that the Atlantic Ocean has received 0.3-0.8 per cent of the global plastic waste for 65 years.
    • To date, a key uncertainty has been the magnitude of contamination of the ocean and our findings demonstrate that this is much higher in terms of mass than has been estimated previously.

    Try this PYQ:

    Q. Why is there a great concern about the ‘microbeads’ that are released into the environment? (CSP 2019)

    (a) They are considered harmful to marine ecosystems.

    (b) They are considered to cause skin cancer in children.

    (c) They are small enough to be absorbed by crop plants in irrigated fields.

    (d) They are often found to be used as food adulterants.

    What are Microplastics?

    • Microplastics are plastic debris smaller than 5mm in length, or about the size of a sesame seed.
    • While they come from a variety of sources, one of them is when larger pieces of plastic degrade into smaller pieces, which are difficult to detect.

    How does plastic reach the oceans?

    • There are multiple pathways for them to reach the oceans.
    • For instance, riverine and atmospheric transport from coastal and inland areas, illegal dumping activities and direct-at-sea littering from shipping, fishing and aquaculture activities, scientists have said.
    • According to the IUCN, at least 8 million tonnes of plastic end up in the oceans every year and makes up about 80 per cent of all marine debris from surface waters to deep-sea sediments.

    Why is plastic pollution especially harmful?

    • Plastic can take hundreds to thousands of years to decompose depending on the type of plastic and where it has been dumped.
    • Some marine species such as zooplanktons show preferential ingestion of smaller particles, making them easier to enter the food chain and their conversion to fast-sinking faecal pellets.
    • Over the past few years, various news reports have shown that marine animals such as whales, seabirds and turtles unknowingly ingest plastic and often suffocate to death.
    • While all sorts of marine species are prone to get impacted by plastic pollution, typically, bigger marine species tend to get more attention because of the amounts of debris they can hold up.

    Impact on humans

    • For humans, too, marine plastic pollution is harmful if it reaches the food chain. For instance, microplastics have been found in tap water, beer and even salt.
    • One of the first studies to estimate plastic pollution in human ingestion that was published in June 2019 said that an average person eats at least 50,000 particles of microplastic each year.
    • Consumption of plastic by humans is harmful since several chemicals that are used to produce plastics can be carcinogenic.
    • Even so, since microplastics are an emerging field of study, its exact risks on the environment and human health are not clearly known.

  • PM CARES Fund is a “public charitable trust”: SC

    The Supreme Court has endorsed the PM CARES Fund as a “public charitable trust” to which donors contribute voluntarily.

    Try this question:

    Q. The creation of PM CARES fund is violative of the provision of the Disaster Management Act, 2005. Analyse.

    What is the case?

    • The petition had argued that the PM-CARES Fund was not subject to CAG audit.
    • It was not under “public scrutiny”. Contributions to it were “100% tax-free”.
    • It was accused that there was statutory fund already in existence under the Disaster Management Act of 2005 to receive contributions to finance the fight against a calamity.

    About PM CARES Fund

    • The Prime Minister’s Citizen Assistance and Relief in Emergency Situations Fund (PM CARES Fund) were created on 28 March 2020 following the COVID-19 pandemic in India.
    • The fund will be used for combat, containment and relief efforts against the coronavirus outbreak and similar pandemic like situations in the future.
    • The PM is the chairman of the trust. Members will include the defence, home and finance ministers.
    • The fund will also enable micro-donations. The minimum donation accepted for the PM CARES Fund is ₹10 (14¢ US).
    • The donations will be tax-exempt and fall under corporate social responsibility.

    What did the Court rule?

    • There is “no occasion” for the Comptroller and Auditor General (CAG) to audit a public charitable trust independent of budgetary support or government money.
    • The court said that PM-CARES is “not open” for a PIL petitioner to question the “wisdom” that created the fund in an hour of need.
    • The court dismissed the idea that the PM CARES was constituted to “circumvent” the National Disaster Response Fund (NDRF).
    • The Bench also refused to direct the transfer of funds from the PM CARES Fund to the NDRF. It said they were two separate entities.

    Also read:

    PM-CARES Fund

  • Bioethanol Blending in Petrol

    The government has set targets of 10 per cent bioethanol blending of petrol by 2022 and to raise it to 20 per cent by 2030 to curb carbon emissions and reduce India’s dependence on imported crude oil.

    Try this PYQ:

    Q.Given below are the names of four energy crops. Which one of them can be cultivated for ethanol?(CSP 2010)

    (a) Jatropha

    (b) Maize

    (c) Pongamia

    (d) Sunflower

    What is Ethanol Blended Petrol (EBP) Program?

    • Ethanol Blended Petrol (EBP) programme was launched in January 2003 for the supply of 5% ethanol blended petrol.
    • The programme sought to promote the use of alternative and environment-friendly fuels and to reduce import dependency for energy requirements.
    • OMCs are advised to continue according to the priority of ethanol from 1) sugarcane juice/sugar/sugar syrup, 2) B-heavy molasses 3) C-heavy molasses and 4) damaged food grains/other sources.

    Bio-ethanol blend in India

    • 1G and 2G bioethanol plants are set to play a key role in making bio-ethanol available for blending but face challenges in attracting investments from the private sector.
    • 1G bioethanol plants utilise sugarcane juice and molasses, byproducts in the production of sugar, as raw material, while 2G plants utilise surplus biomass and agricultural waste to produce bioethanol.
    • Currently, domestic production of bioethanol is not sufficient to meet the demand for bio-ethanol for blending with petrol at Indian Oil Marketing Companies (OMCs).
    • Sugar mills, which are the key domestic suppliers of bio-ethanol to OMCs, were only able to supply 1.9 billion litres of bio-ethanol to OMCs equating to 57.6 per cent of the total demand of 3.3 billion litres.

    Hurdles in meeting the demand

    • Lack of infrastructure: Many sugar mills are best placed to produce bioethanol do not have the financial stability to invest in biofuel plants. There are also concerns among investors on the uncertainty over the price of bio-ethanol in the future.
    • Lack of raw materials: Presently there is no mechanism for depots where farmers could drop their agricultural waste. The central government should fix a price for agricultural waste to make investments in 2G bioethanol production an attractive proposition.
    • Rigid pricing mechanism: Sugars mills have to pay high prices for sugarcane set by the government even when there have been supplying gluts. The prices of both sugarcane and bio-ethanol are set by the central government.

    Way ahead

    • The government should provide greater visibility on the price of bioethanol that sugar mills can expect by announcing a mechanism by which the price of bio-ethanol would be decided.
    • 2G bioethanol not only provided a clean source of energy but also help provide greater income to farmers and prevent them from having to burn agricultural waste which can be a major source of air pollution.

  • Tornado’s dynamics and its India connection

    Babu ChunderSikur Chatterjee’s paper was the earliest record of a tornado’s dynamics in the history of meteorology, according to a study.

    Try this PYQ:

    Q. In the South Atlantic and South-Eastern Pacific regions in tropical latitudes, cyclone does not originate. What is the reason? (CSP 2015)

    (a) Sea surface temperatures are low

    (b) Inter-Tropical Convergence Zone seldom occurs

    (c) Coriolis force is too weak

    (d) Absence of land in those regions

    What is a Tornado?

    • A tornado is a rapidly rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.
    • The windstorm is often referred to as a twister, whirlwind or cyclone winds blow counterclockwise in the Northern Hemisphere and clockwise in the Southern.
    • Tornadoes come in many shapes and sizes, and they are often visible in the form of a condensation funnel originating from the base of a cumulonimbus cloud, with a cloud of rotating debris and dust beneath it.
    • It is generally accompanied by extreme weather such as heavy downpours, hail storms, and lightning.

    Who was Babu ChunderSikur Chatterjee?

    • Chatterjee was an Indian scientist employed with the Surveyor General of India during the British colonial era.
    • He was likely the first person to scientifically document a tornado’s path in 1865, a study from the Indian Institute of Tropical Meteorology (IITM), Pune, has claimed.
    • Chatterjee had published his findings in a journal named Proceedings of the Asiatic Society of Bengal, in a paper titled ‘Note on a whirlwind at Pundooah’, near Hooghly.
    • The paper described a tornado’s dynamics in meticulous detail and was accompanied by a sketch that mathematically depicted its scale, track and rotation.

    His work

     

    • Chatterjee quantitatively mapped the entire trail of á tornado’s destruction.
    • He benefited from the rare opportunity to observe a tornado passing through a railway track where there were conveniently placed markers at predefined locations.
    • This enabled him to observe and make clear measurements of the tornado’s direction, dynamics and path.

    Back2Basics

  • Bhadbhut Project

    The Gujarat government recently awarded the contract for a the Bhadbhut project in Bharuch, Gujarat. It has faced protests from local fishermen for its likely impact on fishing patterns, notably those of hilsa.

    Make a note of major dams in India along with the rivers, terrain, major wildlife sanctuaries and national parks incident to these rivers.

    What is the Bhadbhut Project?

    • It is planned to be a 1.7-km causeway-cum-weir barrage with 90 gates, across the river Narmada, 5 km from Bhadbhut village, and 25 km from the mouth of the river, where it flows into the Gulf of Khambhat.
    • The barrage will stop most of the excess water flowing out of the Sardar Sarovar Dam from reaching the sea and thus create a “sweet water lake” of 600 mcm (million cubic metres) on the river.
    • The barrage will also have a six-lane road that will connect the left and right banks of the river and provide shorten the land distance between two large industrial estates in Surat and Bharuch.
    • The project also aims to prevent flooding in years when rainfall is higher than normal.
    • Embankments 22 km long will be made and will extend upstream towards Bharuch, from either side of the river.
    • The project is part of the larger Kalpasar Project, which entails the construction of a 30-km dam across the Gulf of Khambhat between Bharuch and Bhavnagar districts.
    • The reservoir is meant to tap the waters of the Narmada, Mahisagar and Sabarmati.

    Why are fishermen upset?

    • The barrage is expected to interfere with the migration and breeding cycle of hilsa.
    • A marine fish, hilsa migrate upstream and arrives in the brackish water of the Narmada estuary near Bharuch for spawning usually during the monsoon months of July and August, and continue doing so till November.
    • Once the barrage is built, it is expected to block its natural entry.

    About Hilsa Fish

    IUCN status: Least Concerned

    • The Hilsa is a species of fish related to the herring, in the family Clupeidae.
    • It is a very popular and sought-after food fish in the Indian Subcontinent.
    • Though it’s a saltwater fish, it migrates to sweet waters.
    • It is the national fish of Bangladesh and state symbol in the Indian states of West Bengal and Tripura.
    • The fish contributes about 12% of the total fish production and about 1.15% of GDP in Bangladesh.

  • Death Valley records the highest temperature on Earth

    California’s Death Valley registered a temperature of 54.4 degrees Celsius or 129.9 degrees Fahrenheit on August 16, 2020, which, once verified, could be the hottest temperature ever recorded on Earth.

    Some years back, there was a question in the mains:

    Major hot deserts in the northern hemisphere are located between 20-30 degree north and on the western side of the continents. Why?

    Death Valley and its location

    • Death Valley is a desert valley in Eastern California, in the northern Mojave Desert, bordering the Great Basin Desert.
    • It is one of the hottest places on Earth, along with deserts in the Middle East and the Sahara.
    • The valley is extremely dry because it lies in the rain shadow of four major mountain ranges (including the Sierra Nevada and the Panamint Range).
    • Moisture moving inland from the Pacific Ocean must pass eastward over the mountains to reach Death Valley; as air masses are forced upward by each range, they cool and moisture condenses, to fall as rain or snow on the western slopes.
    • When the air masses reach Death Valley, most of the moisture has already been lost and there is little left to fall as precipitation.

    Key factors leading to its high temperature

    • Solar heating: The valley’s surface (consisting of soil, rocks, sand, etc.) undergoes intense solar heating because the air is clear and dry, and the land is dark and sparsely vegetated. This is especially noticeable in summer when the sun is nearly directly overhead.
    • Trapping of warm air: Warm air naturally rises and cools; in Death Valley, this air is subject to continual reheating as it is trapped by high, steep valley walls and recycled back to the valley floor.
    • Migration of warm air from other areas (advection): Warm desert regions adjacent to Death Valley, especially to the south and east, often heat air before it arrives in Death Valley.
    • Warm mountain winds: As winds are forced up and over mountains (e.g., the numerous ranges west of Death Valley), the winds can be warmed in several ways. The resulting dry, warm winds are known as foehn winds.

  • In news: Mauritius Oil Spill

    A Japanese ship recently struck a coral reef resulting in an oil spill of over 1,000 tonnes into the Indian Ocean near Mauritius.

    Try this PYQ:

    Q.Recently, “oil zapper’’ was in the news. What is it? (CSP 2011)

    (a) It is an eco-friendly technology for the remediation of oily sludge and oil spills.

    (b) It is the latest technology developed for undersea oil exploration.

    (c) It is a genetically engineered high biofuel-yielding maize variety.

    (d) It is the latest technology to control the accidentally caused flames from oil wells.

    What caused the Mauritius oil spill?

    • A Japanese vessel struck a coral reef resulting in an oil spill of over 1,000 tonnes into the Indian Ocean.
    • The ship was carrying an estimated 4,000 tonnes of oil.
    • The accident had taken place near two environmentally protected marine ecosystems and the Blue Bay Marine Park Reserve, which is a wetland of international importance.

    How dangerous are oil spills?

    • Oil spills affect marine life by exposing them to harsh elements and destroying their sources of food and habitat.
    • Further, both birds and mammals can die from hypothermia as a result of oil spills.
    • For instance, oil destroys the insulating ability of fur-bearing mammals, such as sea otters.
    • It also decreases the water repellency of birds’ feathers, without which they lose their ability to repel cold water.

    Some major incidents

    • Some of the world’s largest oil spills include the Persian Gulf War oil spill of 1991 when more than 380 million gallons of oil was poured into the northern Persian Gulf by Iraq’s forces.
    • The 2010 Deepwater Horizon oil spill in the Gulf of Mexico is also considered to be among the largest known accidental oil spills in history.
    • Starting April 20, 2010, over 4 million barrels of oil flowed over a period of 87 days into the Gulf of Mexico.

    How is the oil spill cleaned?

    • There are a few ways to clean up oil spills including skimming, in situ burning and by releasing chemical dispersants.
    • Skimming involves removing oil from the sea surface before it is able to reach the sensitive areas along the coastline.
    • In situ burning means burning a particular patch of oil after it has concentrated in one area.
    • Releasing chemical dispersants helps break down oil into smaller droplets, making it easier for microbes to consume, and further break it down into less harmful compounds.
    • Natural actions in aquatic environments such as weathering, evaporation, emulsification, biodegradation and oxidation can also accelerate the recovery of an affected area. But these occur differently in freshwater and marine environments.