Bio-Denitro and Bio-Denipho Systems — Experiences and Advanced Model Development: The Danish Systems for Biological N and P Removal

Bundgaard, Erik; Andersen, Klaus L.; Petersen, Gitte

doi:10.1016/b978-1-4832-8439-2.50173-5

Cited by 7 publications

(9 citation statements)

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“…Rapidly changing conditions similar to those induced by a pulse substrate addition also take place in fast-alternating systems; for example: (a) They occur in sequencing batch reactors (SBRs) (Demuynck et al, 1994) or standard activated sludge treatment plants (Wouters-Wasiak et al, 1994) with high-frequency intermittent aeration cycles or alternating aeration plants, such as Biodenitro/Biodenipho systems (Bundgaard et al, 1989). (b) They occur in plug-flow-type pre-denitrification systems (Wentzel et al, 1992) with short anoxic residence times, particularly when considering the singlepass hydraulic retention time in the reactor; that is, the ratio of the volume of the reactor to the total inflow to the reactor (influent plus recycle plus internal recirculation flows).…”

Section: Significance Of Modeling Transient Phenomenon For Activated mentioning

confidence: 99%

Transient response of aerobic and anoxic activated sludge activities to sudden substrate concentration changes

Vanrolleghem¹,

Sin²,

Gernaey³

2004

Biotech & Bioengineering

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The state-of-the-art understanding of activated sludge processes as summarized in activated sludge models (ASMs) predicts an instantaneous increase in the biomass activity (which is measured, e.g., by the corresponding respiration rate OUR, NUR, etc.) under sudden substrate concentration changes. Experimental data (e.g., short-term batch respiration experiments under aerobic or anoxic conditions) collected for the calibration of the dynamic models (ASMs) often exhibit a transient phenomenon while attaining maximum activity, which cannot be explained by the current understanding of the activated sludge process. That transient phenomenon exhibits itself immediately upon addition of a substrate source to an endogenously respiring activated sludge sample and it usually takes a few minutes until the activated sludge reaches its maximum possible rate under given environmental conditions. This discrepancy between the state-of-the-art model and the experimental data is addressed in detail in this investigation. It is shown that the discrepancy is not caused by an error in the experimental set-up/data but it is rather due to model inadequacy. Among the hypotheses proposed, it appears that this transient response of the activated sludge most likely results from the sequence of intracellular reactions involved in substrate degradation by the activated sludge. Results from studies performed elsewhere with pure cultures (S. cerevisae and E. coli) support the hypothesis. The transient phenomenon can be described by a dynamic metabolic network model or by a simple first-order model, as adopted in this study. The transient phenomenon occurring in short-term batch respiration experiments is shown to interfere severely with parameter estimation if not modeled properly (2.8%, 11.5%, and 16.8% relative errors [average of three experiments] on Y(H), micro(maxH), and K(S), respectively). Proper modeling of this transient phenomenon whose time constant is on the order of minutes (1 to 3 min) is expected to contribute fundamentally to a better understanding and modeling of Orbal, carousel, and SBR-type treatment plants with fast-alternating process conditions, although such studies are beyond the scope of this report.

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Section: Significance Of Modeling Transient Phenomenon For Activated mentioning

confidence: 99%

Transient response of aerobic and anoxic activated sludge activities to sudden substrate concentration changes

Vanrolleghem¹,

Sin²,

Gernaey³

2004

Biotech & Bioengineering

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“…The pH of the influent ranged between 7 and 8.6, whilst the alkalinity ranged from 391 to 614 mg/l as CaCO 3 . These values of alkalinity ensured complete nitrification without unfavourable repercussions due to the decrease in the pH.…”

Section: Resultsmentioning

confidence: 99%

Reaction rate constants and mean population percentage for nitrifiers in an alternating oxidation ditch system

Mantziaras

Katsiri

2010

Bioprocess Biosyst Eng

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This paper presents a methodology for the determination of reaction rate constants for nitrifying bacteria and their mean population percentage in biomass in an alternating oxidation ditch system. The method used is based on the growth rate equations of the ASM1 model (IWA) (Henze et al. in Activated sludge models ASM1, ASM2, ASM2d, and ASM3. IWA Scientific and Technical Report no. 9, IWA Publishing, London, UK, 2000) and the application of mass balance equations for nitrifiers and ammonium nitrogen in an operational cycle of the ditch system. The system consists of two ditches operating in four phases. Data from a large-scale oxidation ditch pilot plant with a total volume of 120 m(3) within an experimental period of 8 months was used. Maximum specific growth rate for autotrophs (μ(A)) and the half-saturation constant for ammonium nitrogen (K(NH)) were found to be 0.36 day(-1) and 0.65 mgNH(4)-N/l, respectively. Additionally, the average population percentage of the nitrifiers in the biomass was estimated to be around 3%.

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“…The Avedøre WWTP treats the water of 350,000 PE. The plant consists of a BioDenitro configuration (Bundgaard et al, 1989) preceded by a small selector (3% of the reactor volume) for improving the sludge settleability. Simultaneous precipitation is used; metal salt dosage takes place in the outlet from the aeration tanks.…”

Section: The Plantmentioning

confidence: 99%

Modelling and control strategy testing of biological and chemical phosphorus removal at Avedøre WWTP

Ingildsen

Rosén

Gernaey

et al. 2006

Water Science and Technology

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The biological phosphorus removal process is often implemented at plants by the construction of an anaerobic bio-p tank in front of the traditional N removing plant configuration. However, biological phosphorus removal is also observed in plant configurations constructed only for nitrogen removal and simultaneous or post-precipitation. The operational experience with this "accidental" biological phosphorus removal is often mixed with quite a lot of frustration, as the process seems to come and go and hence behaves quite uncontrollably. The aim of this work is to develop ways of intentionally exploiting the biological phosphorus process by the use of instrumentation, control and automation to reduce the consumption of precipitants. Means to this end are first to calibrate a modified ASM2d model to a full-scale wastewater treatment plant (WWTP), including both biological and chemical phosphorus removal and a model of the sedimentation process. Second, based on the calibrated model a benchmark model is developed and various control strategies for biological phosphorus removal are tested. Experiences and knowledge gained from the strategies presented and discussed in this paper are vital inputs for the full-scale implementation of a control strategy for biological phosphorus removal at Avedøre WWTP, which is described in another paper. The two papers hence show a way to bridge the gap from model to full implementation.

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Bio-Denitro and Bio-Denipho Systems — Experiences and Advanced Model Development: The Danish Systems for Biological N and P Removal

Cited by 7 publications

References 0 publications

Transient response of aerobic and anoxic activated sludge activities to sudden substrate concentration changes

Transient response of aerobic and anoxic activated sludge activities to sudden substrate concentration changes

Reaction rate constants and mean population percentage for nitrifiers in an alternating oxidation ditch system

Modelling and control strategy testing of biological and chemical phosphorus removal at Avedøre WWTP

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