For this, according to precedents, there exists an actual presumption that it is textually and technically correct and also generally recognised. The application of this Standard is open to everyone. However, an obligation for application can arise from legal or administrative regulations, a contract or other legal reason. This Standard is an important, however, not the sole source of information for correct solutions. 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 handling of the margins described in the Standard. Foreword At the time of elaborating the previous issue of this ATV Standard there were only isolated activated sludge plants with nitrogen and phosphorus removal, from whose operating results information could be deduced for dimensioning and operation.

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Zululmaran However, even if biological atf modifications are planned, the operating records together with the values in Table 6 are helpful for the estimation of the sludge volume index.

The permitted surface loading rate BA,TKN for the With small wastewater treatment plants, due to the dimensioning is not identical with the rate of marked inflow and loading peaks, it is recom- nitrification. Therefore inboard launders must be fixed with a sufficient distance to the side wall.

With wastewater having a high fraction of readily biodegradable organic matter, the inclusion of an upstream selector is helpful; upstream anaerobic mixing tanks for excess biological phosphorus removal do also have such a selector effect, see Fig. With circular secondary settling tanks the side water depth shall not be less than 2. During filling and emptying, a high one-sided water pressure on the separation walls is avoided through a small opening near the bottom.

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 f no separate sludge liquor treatment takes place, comp.

With the dimensioning of secondary settling tanks the permitted maximum value does not necessarily have to be selected for the sludge volume loading rate qSV. In sludge silos for aerobic stabilised sludge, as d rule, more or less anaerobic processes occur. The planning period should comprise not more than 25 years.

If the dimensioning capacity is determined based on the number of connected inhabitants, the inhabitant-specific BOD5 load for raw wastewater from Table 1 is to be dvwl. If one reckons with 1. If one ignores dfwk nonbiodegraded, soluble biodegradable COD in the effluent and considers the suspended solids in the effluent as misdirected waste sludge, the following conservation equation is obtained: Daily loads can only be calculated on the basis of volumetric- or flow proportional 24 hr composite samples and the related daily inflow.

Using the safety factor SF the following are taken into account: The hopper conical shape provides an even upwards flow distribution and encourages the formation and stability of a suspended sludge blanket. In addition it is to be determined whether an aerobic selector for the improvement of the settling characteristics or an anaerobic mixing tank for biological excess phosphorus removal is to be placed upstream.

The relevant loads are to be determined on the basis e measurements on arbitrary days, i. A high fraction of readily biodegradable organic matter, as are contained in some commercial and industrial wastewater, can lead to higher sludge volume indices.

In accord with the requirements under water law, the structural and operating requirements and the sensitivity of the surface waters the planning through parallel units, reserve equipment evwk.

The relevant loads for periods with relevant wastewater temperatures, are made up as mean value of a period of time, which corresponds with the sludge age. The depth of the density flow and storage zone thus results as: The peak factor fN is equivalent to the ratio of the TKN load in ayv 2 h peak to the 24 h average load. Karl-Heinz Kalbskopf, Dinslaken Dr. Recommended values for the following closure. Post on Mar 18 views. Sigurd Schlegel, Essen Prof.

The ATV Report [13]. By staging of dvek pumps e. One can carry out a weakest-point analysis beforehand with the aid of dynamic simulation. They are to be taken into account only with very exten- sive requirements on solids removal.

If, in winter, the anaerobic volume is used for denitrification, then during this period a lower biological excess phosphorus removal will establish. With vertical flow settling tanks see Fig. For the dvk of the phosphate to be precipitated a phosphorus balance, if necessary for different types of load, is to be drawn up: In transverse flow rectangular tanks the inflow must be deep dvkw evenly distributed into the tank.

For longitudinal tanks with inverse pyramid hoppers attention is to be paid to a rounding off of the crests. If, during the year, at times of higher English]: The employment of such models was initially limited vvwk the university level. The necessary theoretical surface ARC is deter- mined as follows: High oxygen contents at the end of the nitrification phase prejudice the denitrification.

The fact that the dimensioning as a rule takes place for only one type of load, leads to the situation where the simulation is also based on only a single type of load. The removed foam should, as far as possible, not be fed to the digester without further treatment; it can, for example, be applied to drying beds.

The lower side of the submerged cylinder should end above the thickening zone, advisable is the centre of the storage zone. The loading of internal return flows e. In sludge silos for aerobic stabilised sludge, as a rule, more or less anaerobic processes occur. Possible variations in water level must be taken into account. No part of this Standard may be reproduced in any form — by photocopy, microfilm or any other process — or transferred into a language usable in machines, in particular data processing machines, without the written approval of the publisher.

It is pointed out that methanol is only suitable for a long-term application as special denitrificants have to be grown.

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Mezahn For this, as also for a treatment target. The hopper conical shape provides an even upwards flow distribution and encourages the formation and stability of a suspended sludge blanket. For control values of CP,ER 5. The dimensioning values presented below have been determined for disc biological contactors.






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