CEN/TC 165
| Registration number (WIID) | Project No. | Title | Status |
|---|---|---|---|
| 66912 | EN 12255-4:2023 | Wastewater treatment plants - Part 4: Primary treatment | Izstrādē |
| 7238 | EN 12255-5:1999 | Wastewater treatment plants - Part 5: Lagooning processes | Atcelts |
| 66909 | EN 12255-5:2024 | Wastewater treatment plants - Part 5: Lagooning processes | Standarts spēkā |
| 7239 | EN 12255-6:2002 | Wastewater treatment plants - Part 6: Activated sludge process | Atcelts |
| 66910 | EN 12255-6:2023 | Wastewater treatment plants - Part 6: Activated sludge process | Izstrādē |
| 7240 | EN 12255-7:2002 | Wastewater treatment plants - Part 7: Biological fixed-film reactors | Izstrādē |
| 7241 | EN 12255-8:2001 | Wastewater treatment plants - Part 8: Sludge treatment and storage | Atcelts |
| 66906 | EN 12255-8:2024 | Wastewater treatment plants - Part 8: Sludge treatment and storage | Standarts spēkā |
| 7242 | EN 12255-9:2002 | Wastewater treatment plants - Part 9: Odour control and ventilation | Atcelts |
| 66907 | EN 12255-9:2023 | Wastewater treatment plants - Part 9: Odour control and ventilation | Standarts spēkā |
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