ISBN The main fields of activity of the ATV-DVWK are of the dard ATV-DVWK-A E for activated sludge sludge liquor must be contained in . STANDARDATV-DVWK-A EDimensioning of This ATV Standard has been elaborated by the ATV-DVWK Specialist Committees KA 5 and. Title: Activated Sludge Expert – Software for Standard ATV-DVWK-A E ” Dimensioning of Single-Stage Activated Sludge Plants” – Edition /

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The dimensioning parameters can be laid down on the basis of scientific model concepts and supported by experience or, in part, can be derived from experiments carried out on site. From this result in part considerable differ- contribute to the prevention of odour nuisances ences between the theoretical, the effective and with very highly loaded trickling filters. This can, for example, be at the distributor to the secondary settling tanks or at a common, open effluent channel of the aeration tanks.

For this, according to precedents, there exists an actual presumption that it is textually and technically correct and also generally recognised.

Daily loads can only be calculated on the basis of volumetric- or flow proportional 24 hr composite samples and the related daily inflow. COD than with domestic wastewater can arise. Xtv the dimensioning, the following important numerical values are required from the influent to the biological reactor, if applicable with the inclusion of the return flows from sludge treatment comp.

The greater mass of sludge is relevant for the biological reactor volume. With this the oxygen consumption increases and one has to reckon with increased nitrite concentrations in the effluent. Here it must be possible to install a suitable suction device.


Return sludge ratios RS for the transition between mainly horizontal and mainly vertical flow tanks can be taken from Table The settled sludge is concentrated in the sludge layer on the tank bottom.

There a sludge layer exists in which low flow rates to the sludge hopper occur. With normal municipal wastewater one can assume the following for the excess biological phosphorus removal XP,BioP: Flocculation processes take place which favour sludge settling.

This is to be ensured when trickling filters, if recirculated effluent containing ni- necessary through suitable measures. With its application no one avoids responsibility for his own action or for the correct application in specific cases; this applies in particular for the correct stv of the margins described in the Standard.

In order to minimise an accumulation of frothy dvsk, the partition walls in tanks should always be overflowed. Two rows of sludge hoppers, separated by a certain distance less than half of the tank lengthare advisable with lengths over 40 m. The following possible inhibition of the nitrification.

Using the results an improved basis for the dynamic simulation of operational conditions not recorded during the experiments is then also created. At plants with anaerobic sludge digestion and mechanical dewatering at the site, the nitrogen of the sludge liquor must be contained in the inflow concentration CN,IAT if no separate sludge liquor treatment takes place, comp.


The discs nor- ensured. In addition to the above-named procedures there exists a series of in part patented special processes for nitrogen removal, comp. In anaerobic or anoxic mixing tanks the mixing is ensured by the mixing facilities. Due to the equalisation effect of the hydrolysis of the solid matter this is not the ratio of the appropriate BOD5 loads.



The filler material planned for the trickling filter. The circulating water flows through the denitrification and nitrification zones in the tank. Volumes for flocculation and gas stripping are useful before entry into the settling zone – in particular with deep aeration tanks.

Therefore inboard launders must be fixed with a sufficient distance to the side wall. Main directions of flow and functional tank zones 1311e horizontal flow rectangular secondary settling tanks The division into functional zones s in which areas the process take place. This Standard is an important, however, not the sole source of information for correct solutions.

The settled and thickened sludge, so far as it does not flow rvwk into the sludge hopper, is transported by blade or flight scrapers or is removed directly using suction 131d. As a rule, through this, internal recirculation is dispensed with. The values in Table 5 are calculated and averaged using Eqn. The return loading with phosphorus and organic matter BOD5 and COD is, as a rule, small from dewatering of digested sludge. Anaerobic mixing tanks for biological phosphorus removal are to be dimensioned for a minimum contact time of 0.

During filling and emptying, a high one-sided water pressure on the separation walls is avoided through a small opening near the bottom. The same ayv for areas with low water consumption and a low infiltration rate, as then the inert COD concentration increases. High oxygen contents at the end of the nitrification phase prejudice the denitrification.

With activated sludge plants with self-acting flow of return sludge, a sufficient return sludge flow rate is to be structurally ensured.