Waste water treatment

    Cards (16)

    • What is the importance of dealing with waste water for the environment?
      It is crucial for maintaining environmental health and preventing pollution.
    • What are some common sources of waste water at home?
      Common sources include using the toilet and doing the washing.
    • What happens to waste water after it goes down the drain?
      It goes into sewage treatment plants for processing.
    • What agricultural activities contribute to waste water production?
      Nutrient run-off from fields and slurry from animal farms.
    • Why must waste water from domestic or agricultural sources be treated?
      To remove harmful microbes and prevent pollution.
    • What types of waste water require additional treatment stages?
      Industrial waste water containing harmful substances.
    • What are the stages involved in sewage treatment?
      1. Screening: Removal of large materials and grit.
      2. Sedimentation: Heavier solids sink to form sludge.
      3. Biological digestion: Air is pumped to break down organic matter.
      4. Sludge treatment: Bacteria break down sludge in large tanks.
      5. Anaerobic digestion: Organic matter is broken down, producing methane gas.
      6. Additional treatment: For toxic substances, chemicals, UV radiation, or membranes may be used.
    • What is the purpose of screening in sewage treatment?
      To remove large bits of material and grit from the sewage.
    • What occurs during sedimentation in sewage treatment?
      Heavier suspended solids sink to the bottom, forming sludge.
    • How does biological digestion work in sewage treatment?
      Air is pumped through the water to encourage bacteria to break down organic matter.
    • What is the role of anaerobic digestion in sewage treatment?
      It breaks down organic matter in sludge and produces methane gas.
    • What can methane gas produced from anaerobic digestion be used for?
      As an energy source.
    • Why does sewage treatment require more processes than treating fresh water?
      Because it contains more contaminants and requires additional treatment stages.
    • What is a potential alternative to fresh water treatment in areas with limited fresh water?
      Treating and recycling waste water.
    • What is a common public perception about drinking recycled waste water?
      People often dislike the idea of drinking water that used to be sewage.
    • What is the process of treating waste water that contains toxic substances?
      It may involve adding chemicals, UV radiation, or using membranes.