1. Classification by temperature Psychrophiles grow at temperatures below 25°C. Mesophiles grow at temperatures between 25 - 45°C. Thermophiles grow at temperatures between 45 and 60°C.

2. Classification by growth environment Suspended growth Activated sludge Attached growth Trickling filter Rotating biological contactor

3. Ten Growth Requirements 1. Carbon source 2. Energy source 3. Terminal electron acceptor 4. Macro nutrients: C, N, H, O, P, K, S 5. Micro nutrients: Fe, Ni, Co, Mb, Zn, etc.

4. 6.Moisture 7.Appropriate temperature 8.Appropriate pH 9.Absence of inhibition 10.Mixing/contact Ten Growth Requirements

5. Boone wastewater treatment plant

8. Wastewater treatment plants

10. Back River WWTP

14. Abu Dhabi WWTP

19. Budapest WWTP

20. Lake Balaton WWTP

24. Wastewater Treatment in Developing Countries Community Biogas Plant in China

25. Settling Problem in Activated Sludge

26. Summary of sludge processing

27. Filter Press http://www.metlabsolutions.com/Shriver%20Press%20-%20side.JPG

28. View of machine used to aerate compost placed in windrows.

29. Overview of windrow composting operation

30. Schematic of static aerated compost pile

31. Biosolids land application

32. Placement of geomembrane liner in area-type landfill