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With pure carbon removal and nitrification of the organic nitrogen introduced into the sludge without denitrification the retention time with dry digester is released as ammonium nitrogen. Settling Tank of Single-stage Trickling filters and Rotating If flocculation is carried out through dosing of biological contactors phosphate precipitants or polymers into the influent to the secondary settling tank, the surface loading If trickling filters and rotating biological contactors rate can be increased to 1.

As a continuous sludge recirculation is not necessary with trickling filters and rotating biologi- cal contactors, at most simple sludge scrapers sur- fice even with rectangular tanks. The dimensioning values presented below have been determined for disc biological contactors.

Enter the email address you signed up with and we’ll email you a reset link. The re- avoid too heavy a cooling in winter the air open- quirements on characteristics, testing and installa- ings should be constructed so that they are ca- tion of the mineral filling are summarised in DIN pable of being reduced.

The wet weather ess in the secondary settling tank e. If the data are insufficient or the expense for inves- For dimensioning, the following important numeri- tigation, for example with small plants, are in no re- cal values are required from the influent to the bio- lation to the use, loads and concentrations can be logical reactor, if applicablewith the inclusion of the determined on the basis of connected inhabitants return flows from sludge treatment comp.


The Standard shows how to take into account adequately the characteristics of the various obtainable filler materials. During the emergent phase of the material the biofilm can take up oxygen from the surrounding air and in the submerged phase the pollutants from the wastewater. For the width of the tank values up to 7.

If the given values are not met then the calculation is to be repeated with modified For the dimensioning of mineral filled trickling filters height or modified recirculation ratio. Therefore a return load- tention time shorter than 0.

Sigurd Schlegel, Essen Prof.

DWA Shop – Software Activated Sludge Expert

With trickling filters the dimensioning depends on the filler material used. Rotating biological for nitrification and carbon oxidation can take place contactors are partially submerged and slowly ro- taking into account previous treatment steps in ac- tate in a trough through which the wastewater cordance with Sections 5. Sedimentation of the individual small par- measures to raise the alkalinity as a rule are not ticles here is of decisive significance for the reten- necessary with trickling filters and rotating biologi- tion performance.

With preliminary precipita- cal reactor with the treated wastewater, from the tion an undersupply of the fixed bed biology with wastewater. For rea- cation as a rule only small conversion measures sons of safety it is recommended that the nitrogen and an appropriate operation are required.


The following prerequisites are to be met for an 5. Below, general, negligibly small. Recommended values for the following closure. Trickling filter and rotating biological contactor facilities enable the colonisation with micro-organisms which have long generation times. The advantages of the treatment of wastewater in fixed bed reactors in general lie in the small energy con- sumption and the simple and stable method of operation. The trials plants for this are to be es- comp.

Karlheinz Krauth, Stuttgart Dipl. Gert Schwentner, Sindelfingen Dr. For this, as also for a treatment target. In addition to the surface loading rate the design of the rotary distributor also has an effect on the flushing force FF. Helmut Resch, Weissenburg Chairman Dipl.

Lothar Huber, Neubiberg Prof.


Thus even compounds which are difficult to degrade can be eliminated with small loading. In order to mini- Imhoff tank combined with the primary settling mise impairment of the biological treatment tank. The rele- TKN 11 10 10 P 1. Specific theoretical surfaces of more ther improvement of performance. Andreas Schulz, Essen Prof. It is recommended that such measures are imple- For disc biological contactors: With the rotation of the rollers, following contact It can be an advantage to feed back from the efflu- with the wastewater on immersion, there is respec- ent of the last rotating biological contactor into the tively an aeration phase above the water level.