Tiruvallur Ammonia Leak

Syllabus Areas:

GS II - Governance

GS III - Environment and Disaster Management

          A tragic ammonia gas leak in Tiruvallur district, Tamil Nadu. The incident occurred at a private seafood/prawn processing unit near Periyapalayam in Tiruvallur district. Ammonia gas leaked from the industrial facility, affecting workers inside the plant. 

What is Ammonia?

• A colorless gas with a sharp, pungent smell.

• Chemical formula: NH₃.

• Composed of one nitrogen atom and three hydrogen atoms.

• Highly soluble in water, forming ammonium hydroxide.

Where is Ammonia Used?

1. Fertilizer Industry: About 80% of the world's ammonia production is used to manufacture fertilizers such as: Urea, Ammonium nitrate, Ammonium sulfate

2. Refrigeration Systems: Used as a refrigerant (R-717) in Cold storage facilities, Ice plants, Food processing units, Seafood and dairy industries

• The Tiruvallur incident occurred in a seafood processing facility where ammonia is commonly used in refrigeration systems.

3. Chemical Industry: Used in the manufacture of Nitric acid, Dyes, Plastics, Synthetic fibers, Pharmaceuticals

4. Explosives: Used in producing ammonium nitrate. Important for mining and civil engineering activities.

5. Cleaning Products: Glass cleaners, Household cleaners, Industrial cleaning agents

Why is Ammonia Dangerous?

1. Highly Irritating Gas

• Ammonia attacks moist tissues such as Eyes, Nose, Throat, Lungs

• Even low concentrations can cause Burning sensation, Coughing, Watering of eyes

2. Respiratory Damage

• High exposure can lead to Severe breathing difficulties, Lung inflammation, Pulmonary edema (fluid accumulation in lungs), Suffocation

3. Corrosive Nature

• Liquid ammonia can cause Skin burns, Frostbite-like injuries, Eye damage, potentially leading to blindness

4. Toxic at High Concentrations

• Very high concentrations may cause Loss of consciousness, Respiratory failure, Death

Major Industrial Disasters in India:

1. Bhopal (1984) – The Most Important

• Toxic Methyl Isocyanate (MIC) gas leaked from the Union Carbide pesticide plant.

• Considered the world's worst industrial disaster.

• Thousands died immediately; long-term deaths and injuries ran into tens of thousands.

• More than 5 lakh people were exposed to toxic gas.

2. Visakhapatnam (2020)

• Styrene gas leaked from the LG Polymers plant.

• 13 people died and more than 1,000 were affected.

• The leak occurred when the plant was being restarted after the COVID-19 lockdown.

3. Surat

• Toxic gas leak from an industrial tanker in Gujarat.

• Several workers lost their lives.

• Highlighted risks associated with transportation and handling of hazardous chemicals.