Aerobic storage by activated sludge on real wastewater

Carucci, Alessandra; Dionisi, Davide; Majone, Mauro; Rolle, E.; Smurra, P.

doi:10.1016/s0043-1354(01)00108-7

Cited by 92 publications

(51 citation statements)

References 11 publications

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“…The occurrence of this feast-famine condition is consistent with previous investigations (8,14,15) that focused on environmental matrices other than wild microbial consortia and wastewater.…”

Section: Introductionsupporting

confidence: 90%

“…However, recognizing the apparent propensity for wild microbial consortia to synthesize the polymer (14)(15)(16), commercial production of PHA would theoretically appear to be a natural extension of wastewater treatment. In fact PHA synthesis is empirically associated with certain municipal wastewater treatment processes (17)(18)(19), although biological synthesis of PHA in full-scale wastewater treatment facilities, estimated at upwards of 4% (w/w) (data not shown), falls short of quantities necessary for commercial exploitation.…”

Section: Introductionmentioning

confidence: 99%

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Functional Stability of a Mixed Microbial Consortium Producing PHA From Waste Carbon Sources

Thompson¹,

Coats²,

Smith³

et al. 2007

Applied Biochemistry and Biotecnology

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Polyhydroxyalkanoates (PHAs) represent an environmentally-effective alternative to synthetic thermoplastics; however, current production practices are not sustainable. In this study, PHA production was accomplished in sequencing batch bioreactors utilizing real wastewaters and mixed microbial consortia from municipal activated sludge as inoculum. Polymer production reached 85%, 53%, and 10% of the cell dry weight from methanol-enriched pulp-and-paper mill foul condensate, fermented municipal primary solids, and biodiesel wastewater, respectively. Employing denaturing gradient gel electrophoresis of 16S-rDNA from PCR-amplified DNA extracts, distinctly different communities were observed between and within wastewaters following enrichment.Most importantly, functional stability was maintained despite differing and contrasting microbial populations.

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Section: Introductionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Functional Stability of a Mixed Microbial Consortium Producing PHA From Waste Carbon Sources

Thompson¹,

Coats²,

Smith³

et al. 2007

Applied Biochemistry and Biotecnology

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“…Under feast conditions, two modelling approaches have been employed: traditional ASM and metabolic approaches. In the first approach based on a traditional ASM-type model structure, three distinctive yield coefficients independent from each other are used for storage, direct growth on external substrate and growth on internal storage products respectively (Beccari et al, 2002;Carucci et al, 2001;Karahan-Gül et al, 2003;Krishna and van Loosdrecht, 1999;Pratt et al, 2004). The second approach is based on the metabolic model of van Aalst-van Leeuwen et al (1997) for pure cultures (Beun et al, 2000(Beun et al, , 2002van Loosdrecht and Heijnen, 2002).…”

Section: Model Development Feast Phasementioning

confidence: 99%

“…The major driving force behind this modelling trend was the increased understanding of storage polymers to be an essential intermediate in the overall substrate removal in (full-scale) activated sludge systems, particularly subjected to feast and famine conditions (Beccari et al, 2002;Beun et al, 2000;Carucci et al, 2001;Dircks et al, 2001;Henze et al, 2000;Krishna and van Loosdrecht, 1999;Pratt et al, 2004;.…”

Section: Introductionmentioning

confidence: 99%

A new approach for modelling simultaneous storage and growth processes for activated sludge systems under aerobic conditions

Sin

Guisasola

Pauw

et al. 2005

Biotech & Bioengineering

102

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By critically evaluating previous models, a new mechanistic model is developed to describe simultaneous storage and growth processes occurring in activated sludge systems under aerobic conditions. Identifiability was considered an important criterion during the model development since it among others helps to increase the realiability and applicability of models to full-scale WWTPs. A second order model was proposed for description of the degradation of the storage products under famine conditions. The model is successfully calibrated by only using OUR data obtained from batch experiments. Calibrations were performed with biomass from full-scale WWTPs in Belgium and Spain. Predictions of the calibrated model were successfully confirmed using off-line PHB measurements, supporting the validity of the model. An iterative experimental design procedure was successfully applied and found to remarkably improve the parameter estimation accuracy for the growth on storage parameters K1 and K2, which used to have large confidence intervals when using standard experiments. The estimated biomass growth yield on substrate (0.58 mgCOD/mgCOD) is quite close to the theoretically expected range for heterotrophic growth. This became possible by properly accounting for the storage process. Moreover, the maximum growth rate was predicted in the range 0.7-1.3 per day. This range, albeit quite lower than the values reported for the growth-based ASM models, is believed to be more realistic. Finally, the new model is expected to better and more mechanistically describe simultaneous storage and growth activities of activated sludge systems and as such could contribute to improved design, operation and control of those systems.

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“…In both models EPS formation driven by influent S Bs does not have to compete with the formation of storage products (which only occurs through S Bf ). Additional S Bs becomes available through hydrolysis of X B (Carucci et al, 2001). K O,EPS was estimated using a nonlinear regression analysis of the EPS production data vs DO concentration data provided by Jimenez et al (2000).…”

Section: Eps Productionmentioning

confidence: 99%

Population balance models: a useful complementary modelling framework for future WWTP modelling

Torfs

Ducoste

Vanrolleghem

et al. 2014

Water Science and Technology

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Population balance models (PBMs) represent a powerful modelling framework for the description of the dynamics of properties that are characterised by distributions. This distribution of properties under transient conditions has been demonstrated in many chemical engineering applications. Modelling efforts of several current and future unit processes in wastewater treatment plants could potentially benefit from this framework, especially when distributed dynamics have a significant impact on the overall unit process performance. In these cases, current models that rely on average properties cannot sufficiently capture the true behaviour and even lead to completely wrong conclusions. Examples of distributed properties are bubble size, floc size, crystal size or granule size. In these cases, PBMs can be used to develop new knowledge that can be embedded in our current models to improve their predictive capability. Hence, PBMs should be regarded as a complementary modelling framework to biokinetic models. This paper provides an overview of current applications, future potential and limitations of PBMs in the field of wastewater treatment modelling, thereby looking over the fence to other scientific disciplines.

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Aerobic storage by activated sludge on real wastewater

Cited by 92 publications

References 11 publications

Functional Stability of a Mixed Microbial Consortium Producing PHA From Waste Carbon Sources

Functional Stability of a Mixed Microbial Consortium Producing PHA From Waste Carbon Sources

A new approach for modelling simultaneous storage and growth processes for activated sludge systems under aerobic conditions

Population balance models: a useful complementary modelling framework for future WWTP modelling

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