Aakash Maharaj crossword

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Across
  1. 3. make impure by polluting or poisoning
  2. 7. rubbish or waste
  3. 9. where slug decomposed by anaerobic bacteria
  4. 12. removes activation sludge with gravity
  5. 13. water changes from a liquid to a gas or vapor
  6. 15. the state or quality of being impure
Down
  1. 1. fuel by the breakdown organic matter
  2. 2. solid waste such as faeces
  3. 3. cause flocc to stick together
  4. 4. separating solid matter from a liquid
  5. 5. sand pebbles and dirt that settles
  6. 6. the process of rotting and decay
  7. 8. process water through chlorine and ozone
  8. 10. removing biological waste from water
  9. 11. matter that sinks to the bottom liquid
  10. 14. consisted of soaps and oils that floats