Waste water treatment

• Why is waste water treatment important?

  It ensures waste water is safe for the environment
• What are some sources of waste water at home?

  Baths and flushing toilets
• What must happen to waste water before it is released into the environment?

  It must undergo treatment
• What are the stages involved in treating waste water?

  1. Screening
  2. Sedimentation
  3. Biological aerobic treatment
  4. Anaerobic digestion
  5. Additional chemical treatment (if needed)
• What is the purpose of screening in waste water treatment?

  To remove large materials and grit
• What happens during sedimentation in waste water treatment?

  Heavier solids sink to produce sludge
• What is produced from the sedimentation process?

  Sludge and effluent
• What is the role of aerobic bacteria in waste water treatment?

  They break down organic matter using oxygen
• What is anaerobic digestion?

  Breaking down organic matter without oxygen
• What is released during anaerobic digestion?

  Methane gas
• How can methane gas produced from sludge be used?

  As an energy source
• What additional treatment may be needed for waste water with toxic substances?

  Adding chemicals to precipitate metals
• What is one alternative method for treating waste water mentioned?

  Using UV radiation
• Why might people be hesitant to drink recycled waste water?

  They dislike the idea of sewage treatment
• How does treating waste water differ from treating fresh water?

  Waste water requires more processes than fresh water
• What is a challenge of desalination compared to fresh water treatment?

  Desalination requires more energy
• What is a potential benefit of recycling waste water?

  It helps conserve fresh water resources
• What is a common public perception about drinking recycled water?

  People are generally uncomfortable with it
• What is the main concern regarding the treatment of waste water?

  Ensuring it is safe for the environment