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 structural aspects which effect the dimension- ing or which are assumed for the dimensioning are With trickling filters or rotating biological contactors dealt with within the scope of this standard. Details for the calculation, comp. In anaerobic or anoxic mixing tanks the mixing is ensured by the mixing facilities.
The alkalinity, through nitrification with the inclusion of the recovery from denitrification and through phosphate precipitation, decreases approximately as follows: High oxygen contents at the end of the nitrification phase prejudice the denitrification.
The greater mass of sludge is relevant for the biological reactor volume.
DWA Shop – Software Activated Sludge Expert
A scumboard must be arranged in a distance of 30 cm from the launder in order to avoid the overflow of floating sludge.
The following applies without internal recirculation comp. This Standard is an important, however, not the sole source of information for correct solutions.
The correct assumption of the sludge volume index is of particular significance for dimensioning. In addition it is to be z 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. If the existing tank depth undercuts the required minimum value, a reduction of dvwi maximum acceptable inflow rate is worth recommending in order to prevent hydraulic disturbances as a result of a too small tank depth.
Reference values can be taken from Table 9, a more accurate calculation in accordance with , 5. From this one xvwk gather valuable information for planning of the test runs. With regard to the method of function one differentiates between horizontal and vertical flow secondary settling tanks.
Kayser, Braunschweig Chairman Dipl. The precipitant dosing should as far as possible be automatically controlled whereby a control system in the outflow of the aeration dvwwk is preferred. 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.
Vorschau Atv Dvwk a 131e
Here it must be possible to install a suitable suction device. In such a nitrification unit the separation of the discs can be reduced to 10 mm and the specific theoretical surface of the rollers 6. A prerequisite for the secure function of the plant In the case of special conditions the dimensioning planned in accordance with this standard is that can often be carried out more correctly with dvwo aid sufficient qualified, trained and permanently tech- of trials and operating results of existing plants.
Channels and pump sumps for the collection of the activated sludge are useful for the emptying of tanks. 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. Since this standard is also applied outside Germany and atf locally even stricter requirements can be set, it is not aimed exclusively at the observance of the effluent requirements laid down in Appendix 1 of the Wastewater Ordinance AbwV.
It is recom- trate of a downstream nitrifying treatment unit to- mended that such measures are first carried out gether with the mechanically treated wastewater is following presentation of pertinent operational ex- applied to the trickling filter. It serves as a means to balance out unavoidable influences from wind, differences of density or uneven surface feeding.
If the existing tank depth undercuts the required minimum value, a dvek of the maximum acceptable inflow rate is worth 311e in order to prevent hydraulic disturbances as a result of a too small tank depth.
Please help us to share our service with your friends. The influent to the primary settling tank. The precipitant dosing should as far as possible be automatically controlled whereby a control system in the outflow of the aeration tank is preferred.
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.
In tanks with even, bottom covered arrangement of fine-bubble aeration elements, the throughflow, assumed as being homogeneous, can be partially blocked. Z primary settling tanks, External Sludge possibly also fine sieves, are employed for this. Andrea Deininger, Weyarn Dr. Karl-Heinz Rosenwinkel, Hannover Prof. Ahv, with the lower temperatures, the organic loading Bd,BOD,I is an other than the one on which dimensioning is based, the actual sludge age should be applied in Eqn.
Foreword At the time of elaborating the dvw, 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. In order to limit the heavy consumption of alkalinity comp. Both are omitted with aerobic sludge stabilisation. For the inexperienced user there is thus a danger that he considers only very simply the question to be processed.
There a sludge layer exists in which low flow rates to the sludge hopper occur. The effective surface is the surface of return pumps. With stormwater inflow activated sludge is relocated increasingly from the aeration tank into the secondary settling tank. With pre-anoxic zone denitrification, under certain circumstances, by s recirculation a large quantity of oxygen 13e1 transferred into the denitrification tank.
There, even dvwj the selection of a higher return sludge ratio, the displaced sludge from the aeration tank is stored. In the inlet and outlet areas of the tank there are additional hydraulically conditioned disturbance zones present, which are to be kept as small as possible through suitable inlet and outlet design.
Tests are in any case recommended, comp. Flatter slopes down to 1. The values in Table 5 are calculated and averaged dvwj Eqn. Through the latter it is ensured that, with sufficient oxygen transfer and no other negative influence factors, enough nitrificants can be developed or held in the activated sludge, comp.