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 /
|Published (Last):||9 October 2006|
|PDF File Size:||11.89 Mb|
|ePub File Size:||3.53 Mb|
|Price:||Free* [*Free Regsitration Required]|
For the design of secondary settling tanks the following are to be determined: The peak factor fN is equivalent to the ratio of the TKN load in the 2 h peak to the 24 h average dvwj. For longitudinal tanks with inverse pyramid hoppers attention is to be paid to a rounding off of the crests.
With rotating biological contactors the partially submerged filter material is rotated about its longitudi- nal axis with the application 13e1 energy. If not a percentage of nitrogen removal is to be maintained but rather a concentration value, the influent concentration is of great influence; if the concentration in a random sample is to be met e.
Section Odour nuisances can occur with this process with 5. The density flow and storage zone must be dimensioned that under wet weather conditions QWW,h the additional volume of sludge 0. The density flow and storage zone qtv be dimensioned that under wet weather conditions QWW,h the additional volume of sludge 0. For 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.
A hopper slope of 1. Normally they are deeper than horizontal flow secondary settling tanks. Harro Bode, Essen Prof. Thus the total volume is: For excess biological phosphorus removal upstream of each single biological reactor or of a group of biological reactors an anaerobic mixing tank for wastewater and return sludge is placed comp.
The partially treated effluent from upstream denitrifying trickling filters is fed via The following remarks apply both for mineral filled an intermediate settling tank or directly to a subse- trickling filters as well as trickling filters with plastic quent aerated nitrifying treatment unit. 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 1131e have to be grown. They are to be taken into account only with very exten- dvqk requirements on solids removal. High oxygen contents at the transfer from nitrification tank to the following denitrification tank prejudices the denitrification.
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 concentration of suspended solids depends essentially on the functional capability of the secondary settling tanks with fluctuating hydraulic feeding, the sludge volume index and the sludge removal as well as the return sludge ratio and the waste sludge removal.
Flatter slopes down to 1. This Standard is aimed at the secure maintenance of the appropriate specifications and an economic operation. As a rule filler material. With disc bio- to 4 sequentially dvk rollers in separate logical contactors the disc surface corresponds troughs cascade arrangement. Details for the calculation, comp.
Excess biological phosphorus removal is also possible in activated sludge plants which are designed only for carbon elimination, if the sludge age s is at least 2 to 3 days. The lowest oxygen consumption is to be seen at the weekend at which often, in addition, the N: With this one stv the average increase of the COD as: The relevant effluent concentration of the nitrate is to be applied as daily average, If, as in Germany, dcwk 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.
With aeration facilities it is normal to tender with the oxygen transfer in clean water. For the respective types of secondary settling tanks there are various sludge scrapers and sludge return conveyance devices available.
With this, submerged outlet tubes have the advantage that a removal of floating sludge is not obstructed. In rectangular tanks along both sidewalls effluent launders should be arranged. The free acid and alkali portion of certain precipitants must be taken into dvsk separately. 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. For example it can be controlled according to a sliding 1 av 2 hour average of the inflow rate.
The employment of such models was initially limited to the university level.
There a sludge layer exists in which low flow rates to the sludge hopper occur. In hopper shaped tanks the inlet is a central construction with a submerged cylinder and a flow diversion on entry into the tank. Acquisition and recording of the return sludge flow rate is necessary; in addition the recording of the sludge blanket height in at least dgwk of the secondary settling tanks is desirable.
Planar draw-off of the clean water favours the hydraulic efficiency with rectangular tanks also.
SSAT can be taken from Fig. Korrespondenz Abwasser 35 This and the loading is to be taken into account. The overall capacity of the return sludge pumps, i. 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 necessary depth of the secondary settling tank is made up from individual partial depths for the functional zones: The dimensioning av 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.
For ddvwk aerobic sludge stabilisation the sludge age is to be selected, if appropriate in accordance with the relevant wastewater temperature. In accord with the requirements under water law, the structural and operating requirements and the sensitivity of the surface waters the planning through parallel 131f, reserve equipment etc.
Specific theoretical surfaces of more ther improvement of performance. The rele- TKN 11 10 10 P 1. However, even if biological process modifications are planned, the operating records together with the values in Table 6 are helpful for the estimation of the sludge volume index. These should, however, be than 0. The settling process in the secondary settling tank is influenced by the flocculation process in the inlet zone, the hydraulic conditions in the secondary settling tank design of the inlet and outlet, density currents the return sludge ratio and the sludge removal procedure.
In plants, which are designed only to carbon removal, the volume of an aerobic selector can be considered as part of the aeration tank.