- Use of DSI technology in the thermal power plant to curb SO2 emission
- The NTPC’s Dadri Power Plant is opting for a Dry Sorbent Injection (DSI) system for controlling sulphur dioxide (SO2) emissions and ensuring compliance with the 2015 environmental norms within the stipulated deadline.
- The power plant has been asked by the Central Pollution Control Board (CPCB) to comply with the environmental norms for coal-fired thermal power plants by December 31, 2019.
What is DSI (Dry Sorbent Injection)?
- DSI is the practice of injecting a dry alkaline mineral into a flue gas stream to reduce acid gas emission.
- DSI offers advantages in comparison to traditional acid gas scrubber technology:
(a) Lower capital cost,
(b) Wide range of favourable operation conditions,
(c) Much lesser time for completing installation and commissioning.
(d) Improves the efficiency of the electrostatic precipitator (ESP), thus reducing the emission levels of Particulate Matter (PM) further
- While conventional wet limestone flue gas desulphurisation (WLFGD) takes over two years, DSI takes only 12-14 months to be up and running.
- It also reduces emissions of other acidic gases and heavy metals like mercury.
- Sodium sesquicarbonate (or Trona) and sodium bicarbonate are sorbent materials (which can collect molecules of another substance by sorption), though hydrated lime can also be used sometimes.
- India has surplus sodium bicarbonate production. Thus, the reagent is also not very expensive, eliminating high operational costs as a barrier.
- Sorbent injection is not a new technology. It is not entirely unknown to India.
- Sorbent injection with hydrated lime as the reagent has been in practice for a long time in the cement and steel industries in the country to control SO2 emissions.
- The CSE, which has been at the forefront of advocating implementation of the 2015 environmental norms, had recommended that the smaller power generation units (less than 500MW) should be adopting alternatives to the FGD (flue gas desulphurisation) system to achieve compliance with the prescribed standard.
Source- Down to Earth
- Adoption of Qingdao declaration in SCO Summit 2018
- The SCO summit in 2018, which was held in the Chinese city of Qingdao, concluded with the adoption of the Qingdao declaration.
- The declaration calls for implementing the three-year plan to combat terrorism, separatism and extremism.
- It also calls for the implementation of the treaty on long-term good neighbourliness, friendship and co-operation.
- A total of 22 documents have been signed by the SCO countries, including preventing radicalization of youth and prevention of narcotics.
- The SCO Action plan for 2019 to 2020 was also signed.
India and SCO Summit 2018
- Indian Prime Minister underlined the importance of security and connectivity.
- Prime Minister Modi floated the concept of SECURE:
‘S’ for security for citizens,
‘E’ for economic development,
‘C’ for connectivity in the region,
‘U’ for unity,
‘R’ for respect of sovereignty and integrity, and
‘E for environment protection.
- He also called for setting up a specific roadmap for the 25th anniversary of SCO in 2026 for the organisation to grow.
- PM highlighted India’s universal brotherhood, and neighbourhood policy and called upon member states to cooperate in the fields of Agriculture, Water Resources and Pharma.
Source- DD news
- Dhanush, India’s first indigenous long-range artillery gun, clears final test; ready for induction
- India’s first indigenous, long-range artillery gun “Dhanush” has passed its final test at Pokhran, paving the way for its induction into the Army.
- Dhanush is a 155mm x 45mm calibre artillery gun and is also called the “desi Bofors”.
- The design is based on Bofors, now Haubits FH77 which India acquired in the 1980s.
- The gun has been developed by the Ordnance Factory Board (OFB), Kolkata and will be manufactured by the Jabalpur-based Gun Carriage Factory (GCF).
- The GCF (Gun Carriage Factory) got the Dhanush project in October 2011 and the first prototype was made in 2014.
- It has a strike range of 38 kilometres and 81 Percent of its components are indigenous.
Source- Financial Express
- Delhi most vulnerable UT in India’s first disaster risk index, Maharashtra leads states
- A national disaster risk index mapping hazards and vulnerabilities across 640 districts puts Maharashtra at the top of the chart followed by West Bengal, Uttar Pradesh and Madhya Pradesh, while Delhi is most at risk among Union territories (UTs).
- The index is currently in the form of a draft report prepared by the Union home ministry with support from the United Nations Development Programme (UNDP).
- The lower hazard ranking to states like those in the north-east and others like Uttarakhand and Himachal Pradesh, which are prone to earthquakes or floods, seems surprising but the index takes into account economic vulnerabilities and actions taken to mitigate risk.
- The index factors in the exposure of population, agriculture and livestock and environmental risk in drawing up the rankings.
- Capacity building by Gujarat, Tamil Nadu, Assam, Tripura and Himachal Pradesh has lowered their net risk to population and economic losses.
- States like UP, MP and Rajasthan are considered high-risk states despite facing lower natural hazard possibilities due to high vulnerability and low capacity-building, the report notes.
- This national disaster risk index is also in line with India’s commitment to the Sendai Framework, successor to the Hyogo Framework, where it has to substantially bring down disaster losses in terms of lives and properties.
Source- Times of India
- Scientists find the new system to detect paraben level in water bodies
- The researchers came up with a method that is based on nanotechnology and a system known as ‘Lab-on-Valve’.
- The project is aimed at identifying parabens and triclosan in water bodies to help develop measures to correct their harmful effects.
- The research team added carbon-coated titanium dioxide nanotubes to the ‘Lab-on-Valve’ systems for paraben extraction at a low concentration.
- Till now, the usage of nanomaterials in the ‘Lab-on-Valve’ systems was not possible because of their characteristic of forming a cluster or lump in the liquid medium.
- However, the research team synthesised the nanoparticles that can be easily dispersed and were also compatible with the lab value system.
- These are a group of organic compounds used as preservatives in cosmetics and hygiene products, are harmful to human health and it has danger impact on the environment.
- Use of cosmetics with parabens could pose-
(a) A risk of breast cancer in women and when these personal care products end up in water bodies with urban and hospital waste,
(b) They become a threat to corals and
(c) May cause hormonal disruptions in dolphins and other marine animals as well.
Source- Down to Earth
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