is a foundational technical standard published in May 2000 by the German Association for Water, Wastewater, and Waste (ATV-DVWK, now DWA ). It provides comprehensive guidelines for the dimensioning of single-stage activated sludge plants used in wastewater treatment. Purpose and Scope
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Disclaimer: Technical standards are often updated. Always verify that you are using the most current version of the DWA/ATV regulations. Atv Dvwk A 131 E.pdf
Updated formulas for calculating sludge removal efficiency. Conclusion and Importance
: Requires a longer sludge age, typically 6.6 to 10 days , to give slow-growing autotrophic bacteria enough time to oxidize ammonium. is a foundational technical standard published in May
The document is the result of collaborative work by two key specialist committees of the ATV-DVWK: and Committee KA 6, "Aerobic Biological Wastewater Treatment Processes" . These committees were comprised of leading professors and industry experts from Germany, Austria, and Switzerland (e.g., Prof. Dr.-Ing. R. Kayser from Braunschweig and Prof. Dr. rer. nat. L. Huber from Munich).
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Accounts for the temperature-dependent growth rate of nitrifying bacteria, typically using T = 12°C as a standard for design in cooler climates.
Defines parameters for calculating sludge production, sludge age (retention time), and return sludge rates.
The standard splits the wastewater treatment facility design into two deeply dependent functional zones: the biological reactor and the secondary clarifier.