Thermodynamic Modeling of Uranium (VI) Reductive Immobilization in Groundwater of NPCC Sludge Storages (Novosibirsk, Russia)статьяИсследовательская статья
Дата последнего поиска статьи во внешних источниках: 4 сентября 2019 г.
Аннотация:The Biochemical Reduction Of Both Nitrate And Sulfate In U-Containing
Aquifers Of The Novosibirsk Plant Of Chemical Concentrates (NPCC) Was
Investigated Experimentally And Thermodynamically. It Was Observed That
Decrease In Eh Up To −397 Mv Has A Distinct Effect On The Denitrification
And Uranium Precipitation As UO2(S). Nitrate Was Denitrified With A Temporary
Accumulation Of The Intermediate Nitrite On The Day 4th. According
To The X-Ray Fluorescence Analysis And Thermodynamic Calculations,
More Than Half Of The Uranium Is Deposited In The First Stage As UO2+X
oxides, And The Rest, Together With The Sulfides In The Reducing Environment.
Findings Suggest That Accurately Thermodynamic Predicting Of
Groundwater NO3
− And 2 SO4
− Fate Is Primarily Limited By Failing To
Account For A Kinetic Of Redox Fluctuations In The Experiment: 1) Measured
Eh +190 Mv Is Low Despite The High Amount Of Nitrates (1124 Mg/L),
But NH4
+ Predominates In Solution According To Calculations, 2) Sulfate
Reduction Lagged Behind Nitrate Reduction By Approximately 50 Days Unlike
Model Simulation.