| File No | Content |
| 01 | Activated sludge process |
| 02 | Secondary clarifier |
| 03 | Disinfection of wastewater |
| 04 | Operation and control |
| 05 | Practical control methods |
| 06 | Extended aeration ASP |
| 07 | Solids handling and disposal |
| 08 | Condition of wastewaters |
| 09 | Dewatering |
| 10 | Stabilization |
| 11 | Thickening |
| 12 | Volume reduction |
| 13 | Sludge conditioning |
| 14 | Secondary treatment |
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