Atv Dvwk A 131 Epdf Top May 2026

The ATV-DVWK-A 131E is a globally recognized engineering standard used for the dimensioning and design of single-stage activated sludge plants in wastewater treatment. Published in May 2000 by the German Association for Water, Wastewater, and Waste (now known as DWA), this worksheet serves as the primary technical rule for sizing biological reactors and secondary settling tanks. Core Purpose of ATV-DVWK-A 131E

The primary goal of the standard is to provide a reliable, empirical framework for engineers to calculate the physical dimensions and operational parameters of wastewater treatment plants (WWTPs). It is tailored to achieve specific effluent quality criteria, including the removal of: Carbonaceous matter (BOD and COD). Nitrogen (via nitrification and denitrification).

Phosphorus (through enhanced biological phosphorus removal). Key Technical Components

The standard relies on several critical calculations that determine the efficiency and footprint of a treatment facility: ATV-DVWK-A 131E: Sludge Plant Standards - Scribd

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Why Is It Critical?

Without A 131, plant designers would rely on fragmented rules of thumb. The standard provides a mathematically rigorous, field-verified methodology that ensures:

• Compliance with EU wastewater directives (91/271/EEC)
• Consistent effluent quality (COD, BOD5, Ntotal, Ptotal)
• Energy-efficient operation
• Reliable sludge settling

3. Denitrification Dimensioning

1. Apply the Correct Sludge Age Range

The standard defines sludge ages (ƟTS) for different target effluent concentrations. For example: The ATV-DVWK-A 131E is a globally recognized engineering

• Without nitrification: 2–4 days
• With nitrification at 10 °C: 8–12 days
• With denitrification: 10–25 days

Your PDF’s Table 4 is your key reference.

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8. Calculation Example (Simplified)

Given:

• 10,000 PE
• BOD load = 60 kg/d (0.06 kg/PE·d)
• TKN load = 10 kg/d
• Temperature = 12°C
• Required sludge age = 8 d (nitrification)
• ( X_MLSS ) = 3 kg/m³

Step 1 – Tank volume
[ V = \frac60 \cdot 83 = 160 , m^3 ] ATV-DVWK-A 131 (a famous German standard for dimensioning

Step 2 – Denitrification
Denitrification rate at 12°C:
( r_D = 0.03 , kg , NO_3-N/kg , SS \cdot d )
Required removal = 7 kg/d
Denitrification volume ( V_D = \frac70.03 \cdot 3 = 78 , m^3 )

Step 3 – Pre-denitrification fraction
[ f_D = 78/160 \approx 0.49 ]
→ Use 50% pre-denitrification tank.

Part 4: Legal Ways to Obtain a Top-Quality ATV-DVWK-A 131 E PDF

Adapting to Climate Change

While ATV-DVWK-A 131E is a German standard, its principles have been adopted globally because they offer a robust defense against climate change. The standard promotes the concept of "source control" and retention. By accurately modeling the capacity of pipes and the behavior of runoff, it forces engineers to consider

3. Academic Access

Some university libraries subscribe to the “DWA-Regelwerk” online portal. Students and researchers can download standards for free through institutional login. This yields a top-tier PDF without personal cost.