A new general methodology for incorporating physico-chemical transformations into multi-phase wastewater treatment process models

Lizarralde, I.; Fernández-Arévalo, T.; Brouckaert, C.J.; Vanrolleghem, Peter A.; Ikumi, David; Ekama, George A.; Ayesa, E.; Grau, P.

doi:10.1016/j.watres.2015.01.031

Cited by 77 publications

(59 citation statements)

References 20 publications

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“…Physicochemical modelling of wastewater has therefore become an important field of research and development during recent times , Lizarralde et al 2015, Maurer et al 1999, Musvoto et al 2000b, Wrigley et al 1992. Currently, there are significant worldwide efforts being invested in addressing shortfalls in physicochemical descriptions in industrystandard models.…”

Section: Figure 11 -Major Physicochemical Processes Occurring In a Tmentioning

confidence: 99%

“…Several studies have used different modelling approaches to gain an improved understanding of minerals precipitation mechanisms (Barat et al 2011, Hauduc et al 2015, Henze et al 2000, Lizarralde et al 2015, Maurer et al 1999, Musvoto et al 2000a). Typically, unique modelling approaches have been applied to specific experimental datasets.…”

Section: Minerals Precipitation Modelling Approachmentioning

confidence: 99%

“…A reliable description of the movements and cycling of phosphorus and metal cations between the biological system, solid precipitates and the aqueous phase is thus very important, and requires a physico-chemistry platform across a plant-wide model and linked with parallel biological models. Over the past years, a number of modelling studies have been carried out in plant-wide settings, linking physicochemical frameworks with biological models (Barat et al 2013, Ikumi 2011, Lizarralde et al 2015. These studies have been successful at describing biological and physicochemical processes under dynamic conditions, and verifying model approaches using laboratory experiments.…”

Section: Plant-wide Wastewater Treatment Modellingmentioning

confidence: 99%

“…A recent study by Lizarralde et al (2015) modelled precipitation rate kinetics based on constant specific surface area and Monod-style kinetics in mineral state. This rate expression handles nucleation induction kinetics by an additional monod-style term in supersaturation.…”

Section: Precipitation Rate Expressionmentioning

confidence: 99%

“…A recent study by Lizarralde et al (2015) models precipitation kinetics based on constant specific surface area and Monod-style kinetics in mineral state, instead of the linear dependency on Xcryst used in the present study. The rate expression of Lizarralde et al handles nucleation induction kinetics by an additional monod-style term in supersaturation, rather than the approach of the present study using small initial values of Xcryst for nucleation induction kinetics as indicated in Chapter 3.…”

Section: Model Performancementioning

confidence: 99%

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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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Section: Figure 11 -Major Physicochemical Processes Occurring In a Tmentioning

confidence: 99%

Section: Minerals Precipitation Modelling Approachmentioning

confidence: 99%

Section: Plant-wide Wastewater Treatment Modellingmentioning

confidence: 99%

Section: Precipitation Rate Expressionmentioning

confidence: 99%

Section: Model Performancementioning

confidence: 99%

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Dynamic modelling of minerals precipitation in wastewater treatment

Mbamba¹

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TG analysis and kinetic study of organic constituents in wastewater from coal‐gasification process

Zhang

Wang

et al. 2017

Asia-Pacific J Chem Eng

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In the paper, the thermal reactivity of organic constituents from coal-gasification wastewater is performed through physicochemical and thermogravimetric (TG) analysis. The effects of reaction atmosphere, oxygen concentration, heating rate, and final temperature on both solids conversion and degradation rate are experimentally studied. The results indicate that organic constituents mainly consist of aliphatic hydrocarbon, phenols, and ammonium, and so on. The thermal degradation of organic constituents in various atmospheres can be divided into four regions: 100-200, 200-300, 300-410, and 410-900°C. The TG/DTG curves present considerable differences in the last region compared with that in the first three regions. In addition, the degradation rate shows a considerable increase and moves toward higher temperature region with heating rate. Furthermore, the kinetic parameters of organic constituents are analyzed by one multi-heating rate method. The calculated results show that apparent activation energy of organic constituents varies between 82.8 and 91.3 kJ mol À1 under various reaction atmospheres. This information is potentially useful for the design and retrofitting of the large-scale equipment to recover industrial wastewater.

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