Across
- 2. reverse _______, used to remove salt from water
- 5. removing salt from water
- 7. proportion of the Earth with no access to safe drinking water
- 9. kills harmful microbes in water
- 10. gas used to kill microbes in water
- 11. _____ digestion, used to treat effluent
Down
- 1. ______ digestion, used to treat sludge
- 3. stage of waste water treatment where suspended solids fall out of the solution
- 4. ____ water, where the UK obtains it's potable water
- 6. type of water that's safe to drink
- 8. gas produced from sludge treatment