This study was done to increase the understanding of how heavy metals in the aqueous phase are removed at low initial concentrations in different pH and Eh values. The reaction that has been studied is mainly hydroxide precipitation and adsorption in a condensate treatment. In the study, data from one of Vattenfalls waste incinerators was analysed and the results from the data were then compare...

The suitability of residue sand (the coarse fraction remaining from Bayer's process of bauxite refining) for constructing the surface cover of closed bauxite residue storage areas was investigated. Specifically, its properties as a medium for plant growth are of interest to ensure residue sand can support a sustainable ecosystem following site closure. The geochemical evolution of the residue s...

The reported research developed a generic nutrient recovery model (NRM) library based on detailed chemical solution speciation and reaction kinetics, with focus on fertilizer quality and quantity as model outputs. Dynamic physicochemical three-phase process models for precipitation/crystallization, stripping and acidic air scrubbing as key unit processes were developed. In addition, a compatibl...

This work focuses on combined scanning electron microscopy and energy dispersive X-ray analysis (SEM-EDX) applied to granular sludge used for biological treatment of high-strength wastewater effluents. Mineral precipitation is shown to occur in the core of microbial granules under different operating conditions. Three dairy wastewater effluents, from three different upflow anaerobic sludge blan...

We present here the way to bring together two open source modellers, PhreeqC and Elmer, with disjunctive application fields. They are gathered in a single environment to enable multi-component, reactive solute transport studies in threedimensional saturated/ unsaturated ground-water flow systems. The choice of Python as programming environment is explained, the way the tools become so called Py...

A geochemical study was conducted to obtain a comprehensive understanding of fluoride concentration increase in groundwater from a crystalline (hard-rock) aquifer in a small Indian agricultural watershed, where groundwater is intensively abstracted for paddy irrigation. A reactive1-D geochemical model using PHREEQC was used to reproduce fluoride concentrations under rice paddies taking into acc...

Abstract Chemical and phase equilibrum (CPE) calculations are indispensable to the geochemical simulation of natural systems, such as freshwater, groundwater, mineral formations. In environments, many chemical reactions occur, both at interface between rocks fluids (e.g., dissolution reactions) in bulk phases aqueous speciation). Moreover, typical ionic species found nature require thermodynami...

Poor durability of reinforced concrete structures can lead to serious structural failures. An accurate model observe the effects aggressive agents like carbonation, sulfate ingress, and seawater solutions on solid phase assemblage will help designers specifiers better understand how cement behaves in these environments. This paper presents first steps developing such a using PHREEQC geochemical...