WASTEWATER MANAGEMENT

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Across
  1. 2. - Treated sludge used as fertilizer. (9)
  2. 3. - Chemical reaction that breaks down contaminants. (9)
  3. 4. - The process of removing particles from water. (10)
  4. 7. - Measures to maintain hygiene and prevent disease. (10)
  5. 9. - Runoff from rain that can carry pollutants. (10)
  6. 11. - Disinfection process using chlorine. (12)
  7. 12. - Wastewater from baths, sinks, and washing machines. (9)
  8. 17. - Adding air to water to promote microbial growth. (8)
  9. 18. - Conversion of nitrate to nitrogen gas. (15)
  10. 19. - Initial stage of wastewater treatment. (11)
  11. 21. - Removing liquid while leaving solids behind. (9)
Down
  1. 1. - Tiny organisms that break down waste. (14)
  2. 5. - Harmful substances in water. (12)
  3. 6. - Without oxygen, describing certain bacterial processes. (9)
  4. 8. - Process of settling out solids from water. (12)
  5. 10. - Reusing treated water. (9)
  6. 13. - A pond used to treat wastewater. (6)
  7. 14. - Conversion of ammonia to nitrate. (12)
  8. 15. - Semi-solid residue from the treatment process. (6)
  9. 16. - Term associated with a type of sludge that promotes decomposition. (8)
  10. 20. - Treated water released from a wastewater treatment plant. (8)