Across
- 2. wastewater released by homes , industries, hospitals, offices and other users.
- 3. a polluting or poisonous substance that makes something impure.
- 5. conditions related to public health especially the provision of clean drinking water and adequate sewage disposal.
- 8. an underground conduit for carrying off drainage water and waste matter
- 9. the introduction of air into a material.
Down
- 1. we would see a network of big and small pipes called sewers,
- 4. the sludge is transffered to a separate tank where it is decomposed by the anaerobic
- 5. - Solid like faeces settle at the bottom and are removed with a scraper .
- 6. bacteria- germs that can survive and grow where there is no oxygen.
- 7. water- rich in lather , mixed with oil black brown water that goes down the drains