Long-term simulation of the activated sludge process at the Hanover-Gümmerwald pilot WWTP

Mąkinia, Jacek; Rosenwinkel, Karl‐Heinz; Spering, V.

doi:10.1016/j.watres.2005.01.023

Cited by 47 publications

(37 citation statements)

References 17 publications

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“…The values of the model parameters obtained in this way are consistent with previous studies (Van Veldhuizen et al 1999;Brdjanovic et al 2000;Henze et al 2000;Rieger et al 2001;Meijer et al 2002;Ferrer et al 2004;Makinia et al 2005Makinia et al , 2006Sin et al 2008). However, some…”

Section: Calibrationsupporting

confidence: 92%

A practical protocol for calibration of nutrient removal wastewater treatment models

Mannina

Cosenza

Vanrolleghem

et al. 2011

Journal of Hydroinformatics

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Activated sludge models can be very useful for designing and managing wastewater treatment plants (WWTPs). However, as with every model, they need to be calibrated for correct and reliable application. Activated sludge model calibration is still a crucial point that needs appropriate guidance. Indeed, although calibration protocols have been developed, the model calibration still represents the main bottleneck to modelling. This paper presents a procedure for the calibration of an activated sludge model based on a comprehensive sensitivity analysis and a novel step-wise Monte Carlo-based calibration of the subset of influential parameters. In the proposed procedure the complex calibration issue is tackled both by making a prior screening of the most influential model parameters and by simplifying the problem of finding the optimal parameter set by splitting the estimation task into steps. The key point of the proposed step-wise procedure is that calibration is undertaken for sub-groups of variables instead of solving a complex multi-objective function. Moreover, even with this step-wise approach parameter identifiability issues may occur, but this is dealt with by using the general likelihood uncertainty estimation (GLUE) method, that so far has rarely been used in the field of wastewater modelling. An example from a real case study illustrates the effectiveness of the proposed methodology. Particularly, a model was built for the simulation of the nutrient removal in a Bardenpho scheme plant. The model was successfully and efficiently calibrated to a large WWTP in Sicily.

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Section: Calibrationsupporting

confidence: 92%

A practical protocol for calibration of nutrient removal wastewater treatment models

Mannina

Cosenza

Vanrolleghem

et al. 2011

Journal of Hydroinformatics

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“…Others investigate the relationship between the presence of protozoa in sludge and the structure and morphology of flocs on the course of the wastewater treatment process [9][10][11]. An important and currently commonly discussed tasks in wastewater treatment technology are the ways of description of physiological activity of activated [12,13] and fractioning of the substrate to build and calibrate computer models of sewage treatment systems [14][15][16][17][18]. An important aspect of investigation is also application of raw and treated sewage in agriculture [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Impact of optical indices on particle size distribution of activated sludge measured by laser diffraction method

Sochan

Polakowski

Łagód

2014

Ecological Chemistry and Engineering S

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Abstract:The important factors that strongly influence the particle size distributions measured by the laser diffraction method are the optical parameters of the suspension (refractive index and absorption coefficient). Knowledge of the values of these parameters is necessary for Mie theory. Mie theory is applied for conversion of the intensity of light recorded on detectors into particle size distribution (PSD) of tested material. Both wastewater and activated sludge are mixtures of a variety of elements (mineral or organic, including living organisms). In practice, it is not possible to define clearly the values of the optical parameters, as the composition of the suspension changes over time. The aim of the study was to estimate the impact of assumed values of the optical parameters on particle size distributions obtained. The PSDs of suspensions sampled in different stages of wastewater treatment are the most reproducible when the following optical parameters are defined: absorption coefficients -1.0 and the refractive index -1.52.

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“…The plant raw wastewater influent had high levels of organic matter (699±45 gCOD.m -3 ) and could be ranked as medium strength wastewater (Henze 2008). The organic matter contained a significant quantity of soluble COD (31 % of total COD) including VFAs (26% of flocculated soluble COD), and this soluble fraction result agrees well with other studies (Makinia et al 2005, Meijer et al 2001. The concentration of readily biodegradable fraction was high enough and indicated that the extent of biological phosphorus removal in the activated system would be high (Ekama 2010).…”

Section: Steady-state Plant Influentsupporting

confidence: 89%

Dynamic modelling of minerals precipitation in wastewater treatment

Mbamba¹

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In wastewater treatment, there is an increasing focus on nutrient and energy recovery and a reduction in energy consumption to counter climate change. Because of this, integrated mathematical modelling platforms are required to support plant-wide developments making use of emerging, resilient and environmental-friendly technologies. A reliable model description of a wastewater treatment plant should include both biology and physico-chemistry. However, existing standard models used across the wastewater sector have a biological focus with over-simplified descriptions of important physicochemistry, especially with minerals precipitation which is a very important class of physicochemical reactions.As part of development of a more widely applicable physicochemical framework, this thesis sought to identify a suitable minerals precipitation modelling approach that could give reasonable results in mainstream use with wastewater treatment. This research aim was approached in three steps. Firstly a review of available modelling approaches suggested a simple equilibrium kinetic-based modelling approach could be feasible. This approach was then validated in a simple system of calcite in synthetic solutions using pH titration experiments with the reliable Constant Composition Method (CCM).Further statistical analysis focused on clarifying key environmental factors that influence calcite precipitation to determine whether these are necessary to include in a model. Secondly, the proposed model approach was further tested on different types of wastewater and for multiple parallel precipitation reactions. Experiments included dynamic titration or aeration with synthetic wastewater and real wastewater. Thirdly, the general physicochemical modelling approach was implemented in a plant-wide platform together with standard biological models, namely activated sludge model No 2 (ASM2d) and Anaerobic Digestion Model No. 1 (ADM1). The plant-wide model evaluation compared simulations with real data from a full-scale wastewater treatment plant, and used steadystate, dynamic and scenario analyses to test the model performance.Experimental evidence for calcite precipitating in synthetic aqueous solutions, suggested that minerals precipitation kinetics could be reliably described with a 1 st order dependency on mineral Further testing for multi-species systems in real wastewater indicated that precipitation was dominated by the mineral struvite, forming together with varied and minor amounts of calcium phosphate and some calcium carbonate. Kinetic rate coefficients (kcryst), which were statistically fitted, were generally in the range 0.35-11.6 h -1 with 95% confidence intervals of 10-80% relative.The results confirmed that the baseline model approach provided a statistically good fit of measured pH, dissolved calcium, magnesium, total inorganic carbon and phosphate. With this application, the precipitation modelling approach offered the advantage of only requiring a minimal number of empirical fitted parameters (kcryst values), res...

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Long-term simulation of the activated sludge process at the Hanover-Gümmerwald pilot WWTP

Cited by 47 publications

References 17 publications

A practical protocol for calibration of nutrient removal wastewater treatment models

A practical protocol for calibration of nutrient removal wastewater treatment models

Impact of optical indices on particle size distribution of activated sludge measured by laser diffraction method

Dynamic modelling of minerals precipitation in wastewater treatment

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