If you have any more information about the context or source of this file, I'd be happy to try and help you further. Alternatively, if you're looking for information on ATVs in general, I'd be happy to provide some general information on the topic!
: calculating the proportion of denitrification volume ( 0;297;) and phosphorus removal requirements. Atv Dvwk A 131 E.pdf
: Determining required sludge age based on nitrification/denitrification needs and temperature (typically 0;864;0;14a3; 0;16a8; for German standards). If you have any more information about the
The primary objective of ATV-DVWK-A 131 E is to provide engineers with a steady-state approach to sizing biological reactors and secondary settling tanks. It is applicable to municipal activated sludge plants of any size, ranging from small local facilities to large-scale population centers. Key Design Parameters Atv Dvwk A 131 E.pdf