On the basis of a cost-benefit analysis it was decided to expand the Arnsberg WWTP by a multistage biological process which allows for cost-effective integration of the existing facilities. Carbon removal will then be accomplished in a high-loaded activated sludge stage for which the existing primary clarifier is to be reconstructed. The existing trickling filters will be used for nitrification during a midterm period and will be replaced later on either by a moving bed system or by new trickling filters. Line 3 of the existing secondary clarifiers will be reconstructed and used for post denitrification in a moving bed system. The carbon needed for denitrification will be provided by means of sludge hydrolysis and the use of an external carbon source.
Cost-effective upgrading of the Arnsberg WWTP by post denitrification with a moving bed system
N. Jardin, L. Rath, A. Sabin, F. Schmitt, D. Thöle, S. Kühn; Cost-effective upgrading of the Arnsberg WWTP by post denitrification with a moving bed system. Water Sci Technol 1 May 2000; 41 (9): 123–130. doi: https://doi.org/10.2166/wst.2000.0186
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