It looks like you’re referencing a specific technical document code: ATV DVWK A 131 EPDF TOP.
This appears to be a request for a summary, explanation, or content piece about the ATV-DVWK-A 131 standard (German wastewater engineering guideline), with “EPDF” suggesting an electronic PDF version and “TOP” possibly meaning a top-level overview or a premium/topical highlight.
Below is a professional piece you can use or adapt. atv dvwk a 131 epdf top
Yes, but only for projects grandfathered to the 2000 version. New designs should use DWA-A 131:2016 (which exists in English as well). However, many tenders still explicitly list the older ATV-DVWK number.
The document provides:
| Parameter | Approach | |-----------|----------| | Sludge age (θTS) | Temperature-dependent, with correction for nitrification | | Denitrification capacity | Based on readily degradable COD / nitrate ratio | | Tank volumes | Simultaneous denitrification in activated sludge reactor | | Secondary clarifier | Solids loading rate and surface overflow rate |
The German standard ATV-DVWK-A 131 (now superseded by DWA-A 131) provides design rules for single-stage activated sludge systems with secondary clarification, nitrification, and denitrification. It applies to municipal wastewater treatment plants serving >1,000 population equivalents (PE). The standard emphasizes: It looks like you’re referencing a specific technical
The document covers: