Unit 4

• Global Inequalities in Sewage + Water treatments

  Developing countries have difficulty in treating water compared to developed nations as people aren't educated and can't put pressure on politicans
• Risk of Infectious desieses 


  Water born desieses caused by consuming contaminated water
• Accumulation of toxic substances from intrustiral processes

  Reduces oxygen in lakes and rivers causing a reduction in photosynthesys and death of fish
• Biomagnification of toxic substances

  Increased concentration of toxic substances in a organisims tissues at higher levels in the food chain causing illness
• Bioaccumulation

  Accumulation of toxic chemicals in the tissues of a particular organisim
• Acid Rain Impacts organisims in rivers in lakes

  Lower PH levels can make it intolerable for aquatic life

  Fish laying eggs is reduced and fish become malformed

  Aluminium clogs fish gils

  Minerals essential for life are washed out of water
• Nutrient Enrichment leading to eutrophication

  Increse in nutrients such as nitrates and phosphates in water bodies cause alge bloom

  Death of alge causes increase in organic matter that acts as food for bacteria as they decompose the alge

  Bacteria use up oxygen reducing oxygen concentration in the water causing death of organisims