Wastewater treatment plants - Part 10: Safety principles; German version EN 12255-10:2000
Edition 2001-03

Wastewater treatment plants - Part 11: General data required; German and English version prEN 12255-11:2021
Edition 2021-07

Wastewater treatment plants - Part 11: General data required; German version EN 12255-11:2001
Edition 2001-07

Wastewater treatment plants - Part 12: Control and automation; German and English version prEN 12255-12:2022
Edition 2022-03

Wastewater treatment plants - Part 12: Control and automation; German version EN 12255-12:2003
Edition 2003-12

Wastewater treatment plants - Part 13: Chemical treatment - Treatment of wastewater by precipitation/flocculation; German and English version prEN 12255-13:2021
Edition 2021-07

Wastewater treatment plants - Part 13: Chemical treatment; Treatment of wastewater by precipitation/flocculation; German version EN 12255-13:2002
Edition 2003-04

Wastewater treatment plants - Part 14: Disinfection; German and English version prEN 12255-14:2021
Edition 2021-08

Wastewater treatment plants - Part 14: Disinfection; German version EN 12255-14:2003
Edition 2004-03

Wastewater treatment plants - Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants; German version EN 12255-15:2003
Edition 2004-04