Respirometry techniques and activated sludge models

Benes, O.; Spanjers, Henri; Holba, Marek

doi:10.2166/wst.2002.0537

Cited by 15 publications

(7 citation statements)

References 8 publications

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“…The determination of kinetic and stoichiometric parameters, as well as sewage sludge and water inflow characterization has assumed a fundamental role in the last decade for optimized planning [1], modelling [2,3], design [4], management [5] and upgrading [6][7][8] of the biological stage in a wastewater treatment plant. However, the history of respirometry is older than a decade: An important review of the popularity of respirometry explained by its historical impact and its sensitivity and robustness has been available since 15 years ago [9].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Biological Kinetics in a Conventional Municipal WWTP by Means of the Oxygen Uptake Rate Method

et al. 2014

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Pollution control of surface water bodies requires stringent checks on wastewater treatment plants performances. The satisfactory operation of biological treatment, commonly performed by means of activated sludge processes, requires a number of controlling and monitoring procedures. Suitable respirometric techniques for the determination of the kinetic parameters that regulate biological processes have been implemented in order to achieve this aim. This paper describes the results of an experimental research carried out in a conventional Italian municipal wastewater treatment plant. Particularly, the research has been finalized to both evaluate the biological process for the removal of biodegradable pollutants, such as carbonaceous substrates and ammonia nitrogen, and to collect data in order to evaluate a possible plant upgrade. Heterotrophic and autotrophic biomass kinetic parameters have been examined using respirometric techniques based on oxygen uptake measurements. The research performed makes a OPEN ACCESS Sustainability 2014, 6 1834 valuable contribution toward verifying the reliability of the values proposed in the literature for some kinetic parameters, which have been commonly used for a long time.

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Section: Introductionmentioning

confidence: 99%

Assessment of Biological Kinetics in a Conventional Municipal WWTP by Means of the Oxygen Uptake Rate Method

et al. 2014

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“…For instance, a wide range of nitrate consumption rates (CRs) (3-7 mg N per gram volatile suspended solids per hour or mg N gVSS À1 h À1 ) upon acetate addition were measured in seven different European municipal activated sludge samples (Naidoo et al, 1998). Similarly, different oxygen uptake rates (OUR) have been reported for the same carbon source in different activated sludge plants (Dircks et al, 1999;Benes et al, 2002;Hagman, 2003).…”

Section: Introductionmentioning

confidence: 99%

Substrate-dependent denitrification of abundant probe-defined denitrifying bacteria in activated sludge

Morgan-Sagastume

Nielsen

2008

FEMS Microbiology Ecology

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The denitrification capacity of different phylogenetic bacterial groups was investigated on addition of different substrates in activated sludge from two nutrient-removal plants. Nitrate/nitrite consumption rates (CRs) were calculated from nitrate and nitrite biosensor, in situ measurements. The nitrate/nitrite CRs depended on the substrate added, and acetate alone or combined with other substrates yielded the highest rates (3-6 mg N gVSS(-1) h(-1)). The nitrate CRs were similar to the nitrite CRs for most substrates tested. The structure of the active denitrifying population was investigated using heterotrophic CO2 microautoradiography (HetCO2-MAR) and FISH. Probe-defined denitrifiers appeared as specialized substrate utilizers despite acetate being preferentially used by most of them. Azoarcus and Accumulibacter abundance in the two different sludges was related to differences in their substrate-specific nitrate/nitrite CRs. Aquaspirillum-related bacteria were the most abundant potential denitrifiers (c. 20% of biovolume); however, Accumulibacter (3-7%) and Azoarcus (2-13%) may have primarily driven denitrification by utilizing pyruvate, ethanol, and acetate. Activated sludge denitrification was potentially conducted by a diverse, versatile population including not only Betaproteobacteria (Aquaspirillum, Thauera, Accumulibacter, and Azoarcus) but also some Alphaproteobacteria and Gammaproteobacteria, as indicated by the assimilation of 14CO2 by these probe-defined groups with a complex substrate mixture as an electron donor and nitrite as an electron acceptor in HetCO2-MAR-FISH tests.

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“…Indeed, an important condition in order for the denitrification to occur is the ratio of bCOD/NO 3 -N, which, theoretically, has to be larger than 3 (Ekama et al 1986). Short-term batch respirometric experiments with The obtained activated sludge respirometric data ( It has to be noticed that it is possible that the activated sludge was not acclimatised to the particular wastewater and therefore may not use certain (easily biodegradable) compounds immediately (Ekama et al 1986;Benes et al 2002). Biofilm-based respirometry can be a valuable tool for the more accurate and truthful characterisation of the influent, since it mimics the real situation better.…”

Section: Influent Charcaterisation Through Activated Sludge Respirometrymentioning

confidence: 99%

Characterisation and optimisation of individual wastewater treatment systems

Moelants

Janssen

Smets

et al. 2008

Water Science and Technology

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Onsite individual wastewater treatment systems can provide a financially attractive alternative to a sewer connection in locations far from the existing sewer network. These systems are, however, relatively new, and practical experiences, especially long-term field studies, are lacking. Therefore, a thorough study of two compact biofilm-based, aerobic onsite systems, both of five population equivalents, was started in 2001. The assessment of the treatment performance of these systems, as well as the maintenance requirements and the characterisation of the feed are of great importance for the better understanding of the systems in order to optimise their design and performance. This paper presents an evaluation and discussion of the start-up and a starvation period of the two studied systems, followed by a characterisation of the incoming wastewater using activated sludge respirometry experiments in the context of the assessment and improvement of the denitrification process. Individual wastewater treatment systems are characterised by a rather long start-up period of 70-120 days. An important characteristic during the start-up is the nitrite peak, which indicates the initiation of the nitrification process. The respirometric experiments reveal that the failing denitrification is probably caused by an insufficient amount of readily biodegradable COD in the influent.

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Respirometry techniques and activated sludge models

Cited by 15 publications

References 8 publications

Assessment of Biological Kinetics in a Conventional Municipal WWTP by Means of the Oxygen Uptake Rate Method

Assessment of Biological Kinetics in a Conventional Municipal WWTP by Means of the Oxygen Uptake Rate Method

Substrate-dependent denitrification of abundant probe-defined denitrifying bacteria in activated sludge

Characterisation and optimisation of individual wastewater treatment systems

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