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Thermodynamic Calculation in Elimination of Water Pollutants at Hydro‐geo‐chemical Barriers
Author(s) -
Panayotova B.,
Velkov M.
Publication year - 2001
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20010190303
Subject(s) - chemistry , pollutant , sorption , precipitation , groundwater , saturation (graph theory) , environmental chemistry , uranium , adsorption , meteorology , geology , physics , materials science , geotechnical engineering , mathematics , organic chemistry , combinatorics , metallurgy
Thermodynamic saturation coefficients ( K s ) and transformation indices ( I t ) can be used to evaluate the possibility of forming hydro‐geo‐chemical precipitation barriers and assess the solid phase (rock) stability in aquifers. Calculations are made on the basis of data on water pH, E h , conductivity ( x ) and some relevant ion concentrations. The dependencies of K 2 and I t on water pH and E h values can be expressed graphically to estimate the barriers parameters. Barrier generation leads to a decrease in concentrations of pollutants due mainly to precipitation, co‐precipitation and/or sorption processes. Using the diagram K s , I t = f (pH, E h ), supplemented with representative data on concentrations of pollutants before and after the barrier, the elimination and migration of pollutants can be roughly evaluated (predicted) only on the basis of determining pH and E h values of water and concentrations of ions participating in the barrier formation. The proposed method is applied to assess the migration and elimination of pollutants (U, 226 Ra, β‐emitters, SO 4 2 ) in Bulgarian uranium mine surroundings.