Atv Dvwk A 131 Epdf Top Link

The document covers:

Before trusting any file named “ATV-DVWK-A-131E.pdf”, perform these checks:

If any of these fail, it is not a top copy.

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The suffix “E” denotes the English translation. While the original German version (ATV-DVWK-A 131) is authoritative, many international engineers, EPC contractors, and regulatory bodies need the English version for:

The official English version is titled:
“Dimensioning of Single-Stage Activated Sludge Plants” (ATV-DVWK-A 131E, May 2000 / later DWA-A 131E). atv dvwk a 131 epdf top

Important note: A newer DWA-A 131 (2016) exists, but many legacy plants and international contracts still reference the older ATV-DVWK version. Always verify which revision is required.

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Nitrification rate ( r_N ) depends on temperature and sludge age:

[ r_N = k_N,10 \cdot 1.127^(T-10) \cdot \frac1\theta ]

Typical ( k_N,10 ) = 0.25 g N/kg SS·h.

The DWA sells the official English PDF directly. As of 2025, visiting the DWA e-shop (www.dwa.de) and searching for “A-131E” leads to the current version. Benefits:

Sludge age (θ) is the design master variable. For nitrifying plants:

| Temperature (°C) | Minimum sludge age (days) | |----------------|---------------------------| | 10 | 10 | | 12 | 8 | | 15 | 6 | | 18 | 5 | | 20 | 4 |

For simultaneous denitrification, sludge age increases by ~1–2 days. The document covers: Before trusting any file named

Pre-denitrification volume fraction ( f_D ) is determined from:

[ f_D = \fracD_reqr_D \cdot X_MLSS \cdot \theta ]

Typical ( f_D ) = 0.2 to 0.5.