Ammonia

Context: A leakage of ammonia gas from a subsea pipeline connected to a fertiliser manufacturing unit in Chennai resulted in locals experiencing medical conditions such as shortness of breath and burning eyes. 

About Ammonia: 

• Ammonia is a colourless gas with a strong, pungent odour. Naturally occurring sources like soils and vegetation fires release ammonia, but significant contributors to its emission include agricultural practices such as livestock farming and fertiliser use.
  • Nitrogen is a macronutrient required by plants in large quantities for protein synthesis, chlorophyll production, and overall growth. 
  • As agriculture expands to accommodate increasing populations, it is probable that ammonia emissions will also increase.

Ammonia Synthesis:

• The Haber-Bosch process is the primary method for industrial-scale ammonia synthesis.
• It combines hydrogen and nitrogen gases at high temperature and pressure in the presence of a catalyst. This process results in the formation of ammonia gas.

Use of Ammonia: 

• Ammonia is a primary feedstock for producing nitrogen-based fertilisers, which are essential for plant growth.
• Fertiliser Production:
  • Ammonium Nitrate: Obtained by reacting ammonia with nitric acid.
  • Urea: Produced by reacting ammonia with carbon dioxide under high pressure and temperature.
  • Ammonium Phosphate: Formed by reacting ammonia with phosphoric acid.
  • Ammonium Sulphate: Resulting from the reaction of ammonia with sulfuric acid.

Global Warming Potential (GWP): 

• GWP is a measure of how much energy the emissions of 1 ton of a gas will absorb over a given period, relative to the emissions of 1 ton of carbon dioxide (CO2).
  • The larger the GWP, the more that a given gas warms the Earth compared to CO2 over that time-period. 
  • The time-period usually used for GWPs is 100 years. 
• GWPs enable analysts to aggregate emissions estimates from various gases and help policymakers assess and compare emission reduction opportunities across sectors and gases. 

Production of Ammonia- A Climate Concern: 

• The process uses natural gas, which leads to 2.6 metric tons of life cycle greenhouse gas (GHG) emissions per metric ton of ammonia produced.  
• With ammonia being the second most produced chemical in the world, its production accounts for approximately 2% of worldwide fossil energy use and generates over 420 million tons of CO2 annually.  

Consequences related to Ammonia Pollution: 

Impact on human health:

• After reacting with other particles, ammonia emissions can lead to the formation of fine particulate matter (PM2.5), posing serious health risks such as heart and lung diseases. 
• Exposure to high levels of ammonia can cause respiratory problems, such as asthma, bronchitis, and chronic obstructive pulmonary disease (COPD).
• Direct exposure to Ammonia can also irritate the eyes, skin, and throat, leading to discomfort and potential health issues.

Impact on Ecosystem and Biodiversity:

• Ammonia deposition can cause soil acidification, which can harm plant growth and reduce soil biodiversity leading to reduced crop yield.
• Excess ammonia in water bodies can lead to eutrophication, a process that results in algal blooms and oxygen depletion, disrupting aquatic ecosystems.

Impact on the Climate:

• Ammonia emissions contribute to climate change by releasing nitrous oxide (N2O) after oxidation, a potent greenhouse gas with a global warming potential 298 times that of carbon dioxide (CO2).
• N2O is involved in the depletion of stratospheric ozone, which protects the Earth from harmful ultraviolet radiation.
• Ammonia emissions also contribute to the formation of aerosols, which can impact cloud properties and potentially influence climate patterns.

Economic Impacts of Ammonia Pollution: These costs include healthcare expenses, reduced agricultural productivity, and the implementation of pollution control measures.

Way Forward

• The application of anhydrous ammonia (pure ammonia in liquid form), injected into the soil, quickly converts to ammonium ions. This process makes nitrogen available to plants, providing an efficient way to deliver nitrogen to crops.
• Sustainable production of ammonia by developing more sustainable methods for ammonia synthesis, such as using renewable energy sources and carbon capture technologies, to minimise environmental impacts.
• The regulation of ammonia production and use to minimise environmental impacts, such as nutrient runoff and water pollution.
• Farmers should be encouraged to follow best management practices to optimise fertiliser application, reduce nutrient losses, and protect water quality.
• Proper storage and handling of ammonia-based fertilisers should be followed to prevent accidents and environmental hazards.

Chemical Disaster and their Management

Potential Causes of Chemical Disaster: 

• Process and Safety Systems Failures: This includes equipment failures, leaks, or other breakdowns in the systems designed to contain and control hazardous substances.
• Human Errors: These errors may range from simple miscalculations to misinterpretation of procedures, leading to unintended and potentially dangerous outcomes.
• Technical Errors: These may arise from defects, malfunctions, or shortcomings in the design or implementation of these technologies.
• Management Errors: This includes issues related to organisational culture, resource allocation, and overall safety management practices.
• Induced Effects of Natural Calamities: Natural disasters, such as earthquakes, floods, or cyclones, can exacerbate the risks associated with chemical facilities, leading to the release of hazardous substances, and amplifying the impact of the natural calamity.
• Accidents During Transportation: During the shipping or transit of chemicals, whether by road, rail, air, or sea, accidents can result in spills, leaks, or explosions, with potential far-reaching consequences.
• Hazardous Waste Processing/Disposal: Inadequate waste management practices can result in the release of toxic substances into the air, soil, or water.
• Terrorist Attack/Unrest Leading to Sabotage: Intentional attacks may aim to compromise safety measures, damage infrastructure, or release toxic substances, posing risks to both human life and the environment.

Management of Chemical Disaster in India: 

Our country possesses an extensive legal and institutional framework. Various regulations addressing transportation safety, liability, insurance, and compensation have been put in place. The following are the provisions related to chemical disaster management currently in force:

• Explosives Act, 1884: Governs the regulation of explosives to ensure safety.
• Petroleum Act, 1934: Regulates the import, transport, storage, production, and use of petroleum.
• Factories Act, 1948: Focuses on the safety, health, and welfare of workers in factories.
• Insecticides Act, 1968: Regulates the sale, distribution, and use of insecticides.
• Environment Protection Act, 1986: Aims to protect and improve the environment.
• Public Liability Insurance Act, 1991: Deals with the public liability for damages arising from accidents in handling hazardous substances.
• Disaster Management Act, 2005: Provides a comprehensive framework for disaster management.

To further strengthen chemical safety and manage chemical accidents, the Government of India has enacted additional rules and amendments like Rules addressing the management of hazardous waste etc.

Role of NDMA in Chemical Disaster Management: 

The National Disaster Management Authority (NDMA) of India plays a crucial role in Chemical Disaster Management. 

• The authority has formulated specific guidelines to direct ministries, departments, and state authorities in developing detailed disaster management plans. 
• These guidelines advocate a proactive, participatory, multi-disciplinary, and multi-sectoral approach at various levels to enhance chemical disaster preparedness and response.