Across
- 1. solid matter produced by sewage treatment
- 3. microorganisms that can cause diseases
- 7. stagnant water in blocked drains is a good breeding place
- 8. matter discharged into water bodies uses up substantial oxygen dissolved in water
- 9. when the drainage pipe and drinking pipe are close and the leak can make the water
Down
- 2. wasterwater contains microorganisms
- 4. new method use red worm to treat human excreta
- 5. waste water from houses, industries that runs over land containing waste matter
- 6. bathing, flushing toilet and washing are some ways which produce