Low-enthalpy thermal waters (30–70 °C) with nitrogen as a dominant associated gas are spread within the active continental margin of Russian Far East (east and north Okhotsk Sea Coast) traditionally great importance for recreation balneology facilities. The chemically classified into three groups: (i) Na–HCO3(SO4) type, low TDS (0.2 g/L) lowest temperature (<50 high pH (9.1–9.3), (ii) Na–SO4...

Umm Er Radhuma Aquifer (UER) is the most important groundwater aquifer in Saudi Arabia, extending over 1.6 M·km2 eastern part of Arabian Peninsula, forming main throughout Rub’ Al-Khali (RAK). Groundwater salinity increased from west to east, reaching more than 27,000 mg/L near border with United Arab Emirates, where a Na+-Ca2+Clˉ- water type dominated. Gibbs diagrams indicated that dissolution...

Electrokinetic (EK) techniques can effectively mobilize amendments and contaminants in porous media therefore have a great potential for situ subsurface remediation of wide variety organic inorganic contaminants. However, the fundamental mechanisms governing EK applications are complex entail coupling between different flow, transport, electrostatic geochemical processes. In this study we inves...

Pyrite and calcite are mineral phases that play a major role in acid neutral mine drainage processes. However, the prediction of (AMD) or contaminated (CND) requires knowledge composition mining waste related potential for element release. This paper studies combination acid–base neutralizing capacity (ANC–BNC) with geochemical modeling characterization AMD CND. The proposed approach is validat...

Pb contamination of soils is a global problem. This paper discusses the ability an Fe-rich waste, water treatment residual (WTR), to adsorb Pb(II). was investigated using batch sorption experiments, X-ray diffraction, electron microprobe microanalysis, PHREEQC modeling and Extended Absorption Fine Structure (EXAFS) analysis. The WTR composed approximately 23 wt. % natural organic matter (NOM), ...

In this work, geochemical modelling using PhreeqC was carried out to evaluate the effects of reactions on performance underground hydrogen storage (UHS). Equilibrium, exchange, and mineral were considered in model. Moreover, reaction kinetics effect over an extended period 30 years. The developed model first validated against experimental data adopted from published literature by comparing valu...

Abstract Carbonates are characterized by low oil recovery due to their positive surface charge and consequent high affinity negatively charged crude oil, rendering them a state of mixed-to-oil wettability. Thus, better understanding the rock/brine/oil interactions effect on potential-determining ions (PDIs) adsorption/desorption during engineered water injection is needed for realistic represen...