Cost-effective upgrading of the Arnsberg WWTP by post denitrification with a moving bed system

Abstract

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.

Systematic comparison framework for selecting the best retrofitting alternative for an existing water resource recovery facility

“…However, there are only a few works describing a systematic procedure for retrofitting an existing WRRF to other plant configurations to improve effluent quality without expending many resources. Early examples of plant upgrades found in the literature were not based on modeling tools, but on classical design criteria and expert knowledge of the implemented processes (e.g., Jardin et al., 2000; van Loosdrecht et al., 1998). Benedetti, Bixio, Claeys, and Vanrolleghem (2008) developed tools for a model‐based benefit/cost/risk analysis of WRRF alternatives.…”