Chapter 4 Crossword Review

3. Septic system that mainly treats wastewater at the tank
5. Water located in an aquifer
9. Pollution that originates from many sources
10. Silt, sediment, and even heat
11. Most common way for homes in rural areas to get drinking water
12. Disease caused by bad drinking water
15. Water that goes from a gas to a liquid
16. Type of primary wastewater treatment that uses layers of rocks or plastic
18. Layers of sand, gravel and charcoal that removes pathogens
20. Type of bacteria that needs oxygen
21. Tank used to collect heavy raw primary biosolids
22. Solids that sink to the bottom of a septic tank
23. Streams and rivers
24. Septic system that mainly treats wastewater in a leach bed
26. Loosely clumped masses of fine particles
27. Water that changes from a liquid to a gas
28. Toilet water
29. Collection of water in ponds, lakes, and oceans
30. Floating debris such as grease and oil
31. Common disinfectant used in water treatment
33. Water that evaporates from plants
34. Gentle mixing of soon to be drinking water to create flocs
35. Sink, bathtub, dishwashing and washing machine water
36. Boiling water and collecting the vapor for clean water

1. Type of bacteria that doesn't require oxygen
2. Pesticides, oil and gas spills, and mining
4. Used in Activated Sludge Process to increase bacterial action
6. Chlorine, chlorine dioxide, and ozone
7. Ultraviolet light and heat
8. Adding Fluoride to public drinking water
13. Uses an aeration tank to increase bacterial action
14. Secondary step in primary wastewater treatment that collects stones and cinders
17. Pollution that comes from one identifiable source
19. Positive and negative charged particles bind together
25. Wastewater treatment stage that collects solids
30. Wastewater treatment stage that uses biological processes (such as bacteria)
32. Living organisms that cause disease