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COD fraction dynamics: Respirometric analysis & modelling sewer process
Art der Abschlussarbeit
Diplomarbeit
Autoren
- Köhler, Christian
Betreuer
- Prof. Dr. sc. techn. Peter Krebs
Weitere Betreuer
Prof. Dr. ir. Peter Vanrolleghem (Université Laval; Québec, Canada)
Abstract
This work dealt with the fluctuation of readily and slowly biodegradable substrate concentrations in sewer systems during the course of the day. Respirometric analysis was carried out to investigate those COD fractions defined according to the ASM (Henze et al. (2000)). For that purpose, wastewater was sampled at three different times on the day at the inlet of the Saint Nicolas WWTP
(Quebec, Canada). A fluctuation of readily biodegradable substrate with a maximal fluctuation of
10% of the total COD was observed. In contrast, a significant variation of the slowly biodegradable substrate could not be found. Thus, in-sewer hydrolysis processes where particulate material is converted to soluble material do not seem likely so that biological degradation processes or changes in wastewater discharge must have caused the fluctuation of readily biodegradable material.
From a modelling point of view it was investigated how fluctuations of soluble and particulate organic material are considered in integrated sewer systems. For this a sewer model built and calibrated by Solvi (2007) to simulate an urban wastewater system in Luxembourg was analysed and used to investigate the effect of sewer processes on wastewater quality at the WWTP inlet. By the
modelled sedimentation fraction of particulates in stormwater tanks it was shown that sedimentation processes in the sewer system have a considerable influence on the particulate pollutant concentration.
(Quebec, Canada). A fluctuation of readily biodegradable substrate with a maximal fluctuation of
10% of the total COD was observed. In contrast, a significant variation of the slowly biodegradable substrate could not be found. Thus, in-sewer hydrolysis processes where particulate material is converted to soluble material do not seem likely so that biological degradation processes or changes in wastewater discharge must have caused the fluctuation of readily biodegradable material.
From a modelling point of view it was investigated how fluctuations of soluble and particulate organic material are considered in integrated sewer systems. For this a sewer model built and calibrated by Solvi (2007) to simulate an urban wastewater system in Luxembourg was analysed and used to investigate the effect of sewer processes on wastewater quality at the WWTP inlet. By the
modelled sedimentation fraction of particulates in stormwater tanks it was shown that sedimentation processes in the sewer system have a considerable influence on the particulate pollutant concentration.
Schlagwörter
modelling, biodegradable substrate, hydrolysis process, fluctuation
Berichtsjahr
2007