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| ATV-DVWK-A 131E |
| Title: | Dimensioning of Single-Stage Activated Sludge Plants |
| Language: | English |
| Publication date: | 05 2000 |
| Publisher: | DWA |
| ISBN: | 978-3-935669-96-2 |
| Format: | DIN A4 |
| Pages: | 54,0 |
| Price: | 44.50 € |
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| At the time of elaborating the previous issue of this ATV Standard (1988-90) there were only isolated activated sludge plants with nitrogen and phosphorus removal, from whose operating results information could be deduced for dimensioning and operation. Therefore, with many questions, one had to rely exclusively on the results of research. In the meantime, a large number of such facilities have been commissioned so that a wider database, also from practice, is available for a revision. Compared with the issue of ATV Standard ATV-A 131 dated February 1991 the following important changes have been made: · validity for activated sludge plants of any size (up to now ³ 5,000 total number of inhabitants and population equivalents PT). · the chapter on derivation of design flows and loads is taken out, since a separate ATV Standard is to be elaborated for all types of wastewater treatment processes. · dimensioning temperature for nitrogen removal T = 12° C in accord with the requirements from Appendix 1 of The [German] Wastewater Ordinance (AbwV) (previously T = 10° C), under the assumption of a flexible design of the biological rector. · integration of dimensioning for excess biological phosphorus removal. · modification of the denitrification capacity. · change of the determination of the required oxygen transfer. · integration of the dimensioning of an aerobic selector. · option for dimensioning on the basis of the chemical oxygen demand (COD). · increase of the permitted sludge volume loading rate of secondary settling tanks. · modification of the designation of partial depths and the determination of the depth of the thickening and sludge removal zone of secondary settling tanks. · integration of the dimensioning of the sludge removal systems (scrapers) in secondary settling tanks. Explanations on process technology are to be taken from the ATV Manuals "Biological and advanced wastewater treatment "[1] and "Mechanical wastewater treatment" [2]. The figures additionally mentioned in the text refer to the chapters of the manuals. |
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