Water and Waste Water Treatment Crossword

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Across
  1. 3. Conditions related to public health
  2. 5. Continous circulation of water
  3. 8. Increase in industries
  4. 10. Concrete or metal tank for treating sewage
Down
  1. 1. Waste water in sewers
  2. 2. Seeping of water into the ground
  3. 4. Solid matter at the bottom of sedimentation tank
  4. 6. Conversion of organic waste into humus
  5. 7. Impurities in water
  6. 9. Drinkable water