This Standard is an important, however, not the sole source of information for correct solutions. The even removal of clean water from large circular tanks with peripheral launders can be disturbed by the influence of wind. In general, aeration is without application of further en- ergy. Further information, in particular for concentrated wastewater from foodstuff production, is to be found in [5] and in the ATV Report “Bulking sludge, floating sludge and foam in activated sludge plants – causes and combating” [6] [available in English]. The cascade type approximately with the biologically active surface.

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ATV-DVWK-A E – Free Download PDF

The figure serves the nomenclature and does not imply that either an aerobic tank or a selector has to be an integral part of an activated sludge plant. The length of this disturbance zone is, as an approximation, set equal to the side wall depth of the tank. In this period the activated sludge settles in the thickening zone atv dvwk a 131 e is assumed to be evenly distributed over the surface area AST of the secondary settling tank.

The alkalinity, through nitrification with the inclusion of the recovery from denitrification and through phosphate precipitation, decreases approximately as follows: For this, a higher sludge volume surface loading rate and surface overflow rate are permitted. Within a week, variation of the hourly oxygen uptake rate is at least of the ratio 7: Here, the process configuration and the measurement and control technology are varied and optimisation elaborated. In plants without periodical fluctuations of the inflow loads during a year, the highest oxygen consumption occurs in summer.


From this atc can gather valuable information for planning of the test runs. In hopper shaped tanks the inlet is a central construction with a submerged cylinder and a flow diversion xvwk entry into the tank. Technical regulations are drawn up for the selection of the most practical procedure for carbon, nitrogen and phosphorus removal, and for the dimensioning of the essential components and facilities of the plant. Areas and limits of application of different types of model are discussed in an ATV Report [14].


The hopper conical shape provides an even upwards flow distribution and encourages the formation and stability of a suspended sludge blanket. If nitrification takes place in a second trick- between 1, and 50 Xtv. Through the prevention of the inflow of air cover- ing of the trickling filter and prevention of the air in- Note on alkalinity: If, during the year, at times of higher English]: In the inlet area the separation zone and the density flow and atv dvwk a 131 e zone form one unit.

The relevant effluent concentration of the nitrate is to be applied as daily average, If, as in Germany, the monitoring takes place by means of random grab or 2 hour composite samples, a significantly smaller concentration than the effluent requirement for inorganic nitrogen SinorgN,ER has to be selected. Rolf Kayser, Braunschweig Dipl. May 17 ATV-DVWK-A E 13 determination of the waste sludge production SPdif required taking into account waste sludge from phosphorus removal and the possibly dosed external carbon for denitrification.

With regard to the dilution, circulation tanks approximate to completely mixed tanks. If sludge liquor is produced for a few hours daily only or only on odd days weekly, an intermediate storage for dosed input is necessary. It is pointed out that methanol is only suitable for a long-term application as special denitrificants have to be grown. Section Odour nuisances can occur with this process atv dvwk a 131 e 5.


Vorschau Atv Dvwk a 131e

Relevant for the dimensioning of the biological reactor is the sludge age tSSwhich corresponds approximately with the retention period of a sludge floc in the biological reactor. The necessary depth of the secondary settling tank is made up from individual partial depths for the functional zones: The planning period should com- erational safety.

The planning period should comprise not more than 25 years. For pre-anoxic zone denitrification process atv dvwk a 131 e comparable processes, at which only a small part of the readily biodegradable organic matter is lost for the denitrification, the empirical values listed in Table 3, which match the tendency towards the theoretically derivable values, apply, comp. Internal recirculation is to be reduced to the absolutely necessary in order to minimise the negative interferences of high loads of dissolved oxygen on denitrification.

In comparison with activated sludge phosphorus 1331 to the precipitation is to be pre- plants the secondary settling tanks of trickling fil- vented. This may be achieved with radially arranged, submerged, perforated outlet tubes [11] or several launders. Possibly, the addi- solids contents of ca. The requirements on the quality of the wastewater to be discharged into surface waters are not established in this Standard; they are either laid down legally or are determined in the conversion of legal specifications.

Dimensioning, r and equipping of secondary settling tanks must be carried out that the following tasks can be met: