India's first 'Floating Treatment Wetland' (FTW) started in which city of India?

The correct answer is Hyderabad.

• Floating Treatment Wetlands:
  • Floating treatment of wetlands was introduced in Neknampur Lake in Hyderabad to clean and purify the pollution present there.
  • These treatment works are based on the soil-less hydroponics technique to clean up the water body. 
  • This treatment will help in absorbing the excess of nitrates and oxygen present in the water.
  • Some of the cleaning plants used in the treatment are hibiscus, fountain grass, flowering herbs, tulsi, ashwagandha and many others.

Additional Information

• Wetlands:
  • Wetlands are marshy lands which are in transition zones between terrestrial and aquatic ecosystem.
  • Ramsar conventions on wetlands are the important convention present to conserve the wetlands throughout the world.
  • The second day of February each year is celebrated as the World Wetlands Day.